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  • Public defence: 2018-09-28 10:00 Kollegiesalen, Stockholm
    Montecchio, Francesco
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.
    Process Optimization of UV-Based Advanced Oxidation Processes in VOC Removal Applications2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Air pollution is a major concern in developed countries due to its hazardous health effects. Recent studies by the WHO (World Health Organization) estimate that urban air pollution causes a number of diseases of the respiratory tract and is associated with 150,000 deaths each year. Volatile organic compounds (VOCs) are among the major pollutants affecting the outdoor air quality. Given that industrial processes are the main source of atmospheric VOC emissions, national and international authorities have issued regulations to limit such emissions. However, traditional removal technologies such as incineration, have low energy efficiency and high investment costs. AOPs (advanced oxidation processes) offer a promising alternative in which very reactive conditions can be achieved at room temperature, thus greatly increasing energy efficiency. However, this is still not a mature technology due to challenges that limit the range of applications.

    This thesis focuses on two types of UV-based AOP: photocatalysis and UV-ozone. The goal is to improve VOC conversion and achieve a process that is competitive with traditional technologies. The research on photocatalysis presents an innovative UV reactor design that is closer to industrial conditions and has the ability to effectively screen different samples. Effort was put into finding a metallic support for the photocatalyst without using additional adhesives. Several electrochemical treatments were performed on metals to restructure the surface. One treatment proved to be superior when it came to stabilizing the TiO2 coating, especially when compared with the traditional ceramic support.

    Research on UV-ozone AOPs focused on reactor modelling, developing a numerical and a fluid dynamics model. The goal was to gain a deep understanding of the governing phenomena of UV-ozone reactors so as to optimize the reactor configuration. The numerical model created described the UV irradiation and the reaction kinetics accurately, while a computational fluid dynamics (CFD) simulator modelled the fluid a larger scale, simulating two prototypes. The work resulted in general guidelines for the design of UV-ozone UV reactors as well as for full-scale units. 

  • Mata, Carlos
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Development and Evaluation of an Open Platform for Recording, Storage, Visualization and Analysis of Biosignals on the Cloud2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    There is a large number of biosignals that can be obtained from the human body. Repositories of biosignals are used for researchers in many studies as datasets. Datasets with clinical and personal information have many regulations and they are not accessible to everyone.

    Platforms with acquisition, recording and visualization of data are currently used in homecare systems for monitoring patients in an effcient way. Distant monitoring allows a good and prompt communication between patients and physicians.

    This work describes the design and development of a platform at hardware and software level for recording, storage, visualization and analysis of biosignals on the cloud. For the platform, IoT and Cloud Computing resources were used. Open-source and free software are considered for an easy and flexible enlargement of the system.

  • Nordahl, Linnea
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
    Öquist, Sara
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
    Förstudie rörande digitalisering av symtomformulär för Barn gastro- och nutritionsmottagningen på Astrid Lindgrens barnsjukhus2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Barn gastro- och nutritionsmottagningen på Astrid Lindgrens barnsjukhus använder i sitt dagliga arbete ett symtomformulär som besvaras av patienter och läkare vid varje läkarbesök. Då arbetet i samband med symtomformuläret idag är tidskrävande finns ett behov av en digital lösning i form av en applikation. För att eliminera det tidskrävande arbetet är det viktigt att applikationen är kopplad till journalsystemet TakeCare.

    I projektet har en applikation med tillhörande databas och server utvecklats. TakeCare har kontaktats för att svara på vilka möjligheter och krav som finns gällande att koppla applikationen till deras journalsystem. Det har även utförts en kartläggning av behovsbilden kring liknande lösningar på andra mottagningar.

    Resultatet visar att den framtagna applikationen måste vara CE-märkt, följa GDPR och patientdatalagen samt vara godkänd av TakeCare-förvaltningen för att få kopplas till journalsystemet. TakeCare kräver även information om hur applikationen ska förvaltas och finansieras. Genom framtida arbete kan fler krav komma att visa sig viktiga för att genomföra en sammankoppling. Kartläggningen visar att det finns ett större behov av liknande digitala lösningar inom vården vilket innebär att applikationen i framtiden kan komma att eliminera en tidskrävande process på fler mottagningar än barn gastro- och nutritionsmottagningen.

  • Cao, Phuong
    et al.
    KTH, School of Electrical Engineering (EES), Communication Theory.
    Oechtering, Tobias
    KTH, School of Electrical Engineering (EES), Communication Theory.
    Skoglund, Mikael
    KTH, School of Electrical Engineering (EES).
    Transmit Beamforming for Single-user Large-Scale MISO Systems with Sub-connected Architecture and Power Constraints2018In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558Article in journal (Refereed)
  • Barbette, Tom
    et al.
    University of Liege.
    Soldani, Cyril
    University of Liege.
    Mathy, Laurent
    University of Liege.
    Fast userspace packet processing2015In: Architectures for Networking and Communications Systems (ANCS' 15), IEEE Press, 2015, p. 5-16Conference paper (Refereed)
  • Wärnheim , Alexander
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Synthesis and characterization of a water-based hybrid nanophosphor-nanocellulose ink2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • Gillner, Disa
    KTH, School of Electrical Engineering and Computer Science (EECS), Media Technology and Interaction Design, MID.
    Exploring the Design Space of Web-based Solutions for Mindfulness-Based Cognitive Therapy2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    More and more people are affected by stress in their work lives, and it is in society’s interest to decrease the levels of stress [15]. There are several approaches that can be used to reduce stress, such as bodily exercises, digital aids, psychological treatment programs, or relaxation exercises. A new psychological program called Mindfulness-Based Cognitive Therapy (MBCT), originally used to prevent relapses in depression, can also help to treat stress. However, not much research has been conducted on the effects of MBCT to treat stress, and even less on how to design for web solutions for this treatment. The aim of this study is to investigate and explore how web solutions for mindfulness-based cognitive therapy used to treat stress can be designed, with the research question Based on an informed understanding of Mindfulness-Based Cognitive Therapy, how might we, from a design perspective, design a novel web application for it? To investigate this, a research through design approach was used, and the method “future workshop” for the evaluation of the design prototype. The results of this study suggest that when designing websites for MBCT treatments, the most important features to include are visual representations of the patient’s progress and regulated home assignments. The visual representations should show the correlation between stressors and mood, and the regulation would provide assurance to the therapist that the patient does the home assignments. However, more research should be done to further explore the design space in web solutions for mindfulness-based cognitive therapy.

  • Nevrokopli, Foteini
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Urban and Regional Studies.
    Communal Urbanism: Applications in Densified Urban Environments2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • LI, YUANXUN
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatics.
    SVM Object Based Classification Using Dense Satellite Imagery Time Series2018Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
  • Freddo, Maurizio
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, System Analysis and Economics.
    Free rides on public transport.: Test traveller project as a soft policy measure forchanging travel behaviour. Empirical findingsfrom the Swedish context.2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The present study examines a Mobility Management measure called “test traveller project”, which aims at increasing the public transport modal share by offering free public transport tickets to those who often use their car for their daily commuting and trips. The existing literature consists of a rather limited number of cases and their scope is usually limited because only some of the main elements that influence one’s travel behaviour are considered in each study. Furthermore, literature is not unanimous in concluding that this measure can reduce car use. This work studies more than 50 cases in Sweden, and by employing the Theory of Planned Behaviour the effects of test traveller projects have been examined in an empirical case in the Swedish municipality of Botkyrka, located in the Stockholm metropolitan area. The findings underline that a test traveller project, despite its limitations, may be a valid and relatively simple tool available to public bodies and public transport companies for enticing a segment of car drivers to switch to public transport where it is a valid alternative. In fact, according to the literature, the major results achievable are around 20% of new public transport users among test travellers, whereas in Sweden 20% has been achieved by the first upper quartile of the projects. In particular, the effectiveness of a test traveller project is greater when combined or conducted in parallel with other measures such as improvements in the public transport offer and/or changes in the transport system aiming at disadvantaging car use. The case study of Botkyrka has confirmed that attitudes are the major influencing factor when making the transport mode choice. Further, it has confirmed that environmental concerns and the time passed from one’s residential relocation also play an important role. Habits seem to be less important, thus adhering to that literature whose authors argue that an external event (such as moving home) makes people reflect upon and rethink their travel habits. The case study in Botkyrka has empirically demonstrated how the project participants correct their beliefs and perceptions about public transport, sometimes in a positive way and sometimes in a negative way. An interesting finding is the existence of a new category of people living in the suburbs. Literature indicates that, in the same suburban context, individuals with suburban land use preferences tend to use the car more that individuals with urban land use preferences. In the case study of Botkyrka clearly emerged as a majority among the test traveller project participants a category of individuals who have a suburban land use preference but at the same time would like to use public transportation instead of their car and have high environmental concerns.

  • Fokin, Dennis
    KTH, School of Electrical Engineering and Computer Science (EECS).
    A secure multi-party scheme with certificateless cryptography for secret key extraction2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Many systems contain sensitive data such as user credentials used for authentication purposes. For large systems, a common approach is to store the data in a configuration file at a trusted third party. However, that would imply a single point of failure if an adversary gains access to the trusted party. In theory this could be solved by encrypting the data but in practice this only moves the problem and does not solve it, since some type of credential data is needed to decrypt the configuration file.

    A more flexible solution is needed that requires less of human interaction while also providing a higher degree of security. This thesis proposes a complete cryptographical system for solving this problem in a typical enterprise setting with a set of additional implementation requirements by using multi-party computation and Shamir's secret sharing protocol. Additionally, the work combines the mentioned system with a certificateless cryptography based multi-party computation protocol, since certificates usually implies a time-consuming process. The system has been evaluated in terms of security and efficiency with the conclusion that the results look promising. In terms of performance, the bulk of the overhead comes from certificateless cryptography, a constraint for the specific scenario which might not be present in general. The work also provides incentives for developing and further evolving Java libraries for cryptography, especially for multi-party computation and certificateless cryptography.

  • Movin, Maria
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Spelling Correction in a Music Entity Search Engine by Learning from Historical Search Queries2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Query spelling correction is an important component of modern search engines that can help users to express their intent, and thus improve search quality. In this study, we investigated with what accuracy a sequence-to-sequence recurrent neural network (RNN) can recognise and correct misspellings in a music search engine, when the model is trained with old search queries. A sequence-to-sequence RNN was chosen as the model in this study since it has achieved state-of-the-art performance on similar tasks, such as machine translation and speech recognition. The findings from the study imply that the model learns to correct and complete queries with higher accuracy compared to a baseline model that returns the input query. However, we suggest that, for a model that would be good enough for production, more work needs to be done. Especially, work on creating a cleaner, less biased training dataset. Nevertheless, our work strengthens the idea that sequence-to-sequence RNNs could be used as a spell correction system in search engines.

  • Kanakopoulos, Theodoros
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Urban and Regional Studies.
    Pannone, Michelle
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Urban and Regional Studies.
    The City as a Museum: Reshaping the Urban Interiors of Stockholm2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Physically speaking, contemporary urban environments exist on top of older ones. A perfect variation of layers remain hidden in the soil on which we walk. In European cities, the center remains a stagnant historical exhibit for tourists and locals alike. Change happens on the periphery affecting different areas that surround the center. Stockholm is an exception to this notion, where rebuilding happens in the very city center. LowerNorrmalm remains a nucleus of constant change-drastically affected by the demolished past. The museumoffers a framework for the proposed narrative. Α transcendent structure that ignores selectively the form of the city and therefore the architecture. At its core, the exhibit consists of elements of engagement that translate the scale of the city to the inhabitant's everyday encounters. This urban museum creates a new layer that binds the area through a factory of urban experiences that establish a dynamic environment.

  • Ljung, Fredrik
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Secure Handling of Electronic Health Records for Telemedicine Applications2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Medical record systems are used whenever caregiving is practiced. The medical records serve an important role in establishing patient safety. It is not possible to prevent honest-but-curious doctors from accessing records since it is legally required to allow doctors to access health records for emergency cases. However, it is possible to log accesses to records and mitigate malicious behaviour through rate limiting. Nevertheless, many of the records systems today are lacking good authentication, logging and auditing and existing proposals for securing medical records systems focus on the context of multiple different healthcare providers. In this thesis, an architecture for an electronic health records system for a telemedicine provider is designed. The architecture is based on several requirements from both the legal perspective and general security conventions, but also from a doctor’s perspective. Unlike the legal and general security conventions perspective, doctor requirements are more functionality and usability concerns rather than security concerns. The architecture is evaluated based on two main threat models and one secondary threat model, i.e. insider adversaries. Almost all requirements are satisfied by the solution design, but the two main threat models can not be entirely mitigated. It is found that confidentiality can be violated by the two main threat models, but the impact is heavily limited through audit logging and rate limiting.

  • López, Sergio
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Anomaly Detection and Root Cause Analysis for LTE Radio Base Stations2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This project aims to detect possible anomalies in the resource consumption of radio base stations within the 4G LTE Radio architecture. This has been done by analyzing the statistical data that each node generates every 15 minutes, in the form of "performance maintenance counters".

    In this thesis, we introduce methods that allow resources to be automatically monitored after software updates, in order to detect any anomalies in the consumption patterns of the different resources compared to the reference period before the update.

    Additionally, we also attempt to narrow down the origin of anomalies by pointing out parameters potentially linked to the issue.

  • Pan, Leyang
    KTH, School of Electrical Engineering and Computer Science (EECS), Media Technology and Interaction Design, MID.
    Exploring the Applicability of Gamification in Online Booking Negotiation: Design Process and Evaluation2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Negotiation is an essential part of the user journey in online booking experiences, while it is often perceived as non-engaging and stressful because of the great amount of details that need to be taken care of, which would result in frustration and other negative experience. Aiming to increase the user engagement in the booking negotiation process, this study explored the applicability of gamification in an online booking negotiation tool for booking artists, by following the MDA game design framework (mechanics, dynamics, aesthetics) and taking a three-round user-centred iteration. The resulting gamification design was built as hi-fi clickable prototype and was evaluated by 30 participants with both qualitative and quantitative methods, in comparison to a prototype of conventional negotiation tool with the same functionality but without gamified elements. Although limitation existed in the study due to the given resources, the results showed an overall advantageous performance of the gamified version over the conventional version, and therefore indicated a positive influence of gamification upon user engagement, when being applied to an online booking context. The findings from the design iteration as well as the results from the final evaluation provided implications for future studies.

  • van der Heide, Ewoud
    KTH, School of Electrical Engineering and Computer Science (EECS), Media Technology and Interaction Design, MID.
    Using games as educational tools: An evaluation of a game for children to train facial expression recognition2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Facial expressions play a large role in non verbal communication. Research shows promising results for using games to improve facial expression recognition in children with autism spectrum disorder. Games are effective educational tools and are successful in motivating students. Using a game to improve facial expression recognition could be beneficial for all children as it reduces the risk for problematic behavior and mental health issues.

    For this study a game to train facial expression recognition to children was developed and evaluated. The goal of the evaluation was to determine which factors influence performance and engagement in the game and if there are expressions that are often identified incorrectly. Additionally the children’s attitude towards the game was evaluated.

    The results show that performance is affected by the difficulty, context and intensity. The children that showed the most engagement also performed better in the beginning of the game, however the correlation between performance and engagement is complex. Unfortunately it was not possible to evaluate the effect of rewards on the children’s engagement, but children were generally positive on the rewards. The confusion of expressions was in line with earlier research, but not as symmetrical. The players were generally positive about the game. Further research is needed to determine the long term learning effects of the game and to assess ways to engage players more.

  • Wu, Xiangyi
    KTH, School of Electrical Engineering and Computer Science (EECS), Media Technology and Interaction Design, MID.
    Use animations to support knowledge transfer built on the understanding of the non-experts’ mental model2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Knowledge visualization as a recent branch of visualization science was established by Burkhard [1] at 2004. In his theory, animation was mentioned as one of major visual formats for knowledge transfer. However, there is a lack of  further research about its impact on the transfer of knowledge. The aim of this study is to understand key characteristics that constitute to the mental model of non-experts on domain knowledge. Subsequent to this, it is investigated how animations support knowledge transfer to non-experts. In this study, home automation planning is used as a case to explore the characteristics that best constitute a good animation for knowledge transfer. The results showed that non-experts’ general attention was placed on cause and effect relations of a typical automatic lighting control and non-experts had misconceptions possibly because of different life experience, knowledge background, information vagueness, and overconfidence. The event segmentation in non-experts’ mental model was used to guide animation design which resulted in higher perceived clarity, less misconceptions during knowledge transfer to non-experts. In addition, our results from exploratory observation indicated that animations have potential to facilitate collaborative knowledge transfer and decision making process.

  • Li, Edwin
    KTH, School of Electrical Engineering and Computer Science (EECS).
    LSTM Neural Network Models for Market Movement Prediction2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Interpreting time varying phenomena is a key challenge in the capital markets. Time series analysis using autoregressive methods has been carried out over the last couple of decades, often with reassuring results. However, such methods sometimes fail to explain trends and cyclical fluctuations, which may be characterized by long-range dependencies or even dependencies between the input features. The purpose of this thesis is to investigate whether recurrent neural networks with LSTM-cells can be used to capture these dependencies, and ultimately be used as a complement for index trading decisions. Experiments are made on different setups of the S&P-500 stock index, and two distinct models are built, each one being an improvement of the previous model. The first model is a multivariate regression model, and the second model is a multivariate binary classifier. The output of each model is used to reason about the future behavior of the index. The experiment shows for the configuration provided that LSTM RNNs are unsuitable for predicting exact values of daily returns, but gives satisfactory results when used to predict the direction of the movement.

  • Public defence: 2018-10-05 10:00 Kollegiesalen, Stockholm
    Mölleryd, Bengt A
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Governance of innovation - creating an architectural framework for innovation of technological systems for energy, security and defence2018Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Governance of innovation – creating an architectural framework for innovation of technological systems for energy, security and defence

    Innovation has a great deal of attraction but is associated with serious uncertainties and downsides. It is potentially beneficial for growth, sector and industrial development and competitiveness. Innovation brings hope of solving societal challenges, such as climate change and environment protection, and could help secure a supply of energy. Furthermore, it improves resilience and strengthens security and defence.

    The downside of innovations of some magnitude concern severe transitions and disruptions. Digitisation, with associated net technologies, is an illustrative example of an innovation that creates new services, competitiveness and other benefits which is enormously positive and attractive, while simultaneously dismantles and destroys existing systems, firms and branches, and whole sectors and practices on the negative side.

    The thesis deals with systemic innovation, defined as a value-adding (to the customer and user) set or convergence of new products/services from technological systems in processes which emerge by evolutionary association and integration of systems transforming businesses, industries and sectors (with disruptions as consequence). On the basis of the systemicitiness of innovations and innovation processes an architectural framework for innovation aiming at governance of innovation is suggested. Platform based ecosystems examplifies an emulation of systemic innovation that aligns with the proposed framework. The suggested framework is a product from innovation case studies as from analysis of events, patterns, landscapes and models of innovation in the literature, supported with theoretical deliberations and studies of systemicitiness and from reviewing governance approaches and models for innovation and innovation processes. The architectural framework is intended as a light weight complement to usually linear R&D based enterprise architectures, systems engineering methods, standards and protocols (e.g. ISO/IEC 15288:2015, ISO/IEC 42010:2011, NISP) with their demands for data and series of projects.

  • Ammendrup, Katrin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
    Framework for Wireless Acquisition of Surface EMG and Real-Time Control2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Muscle driven devices are controlled or powered with muscle activation. These devices open up the possibility of offering patients with limited muscle function to automatically control assistive devices - for instance exoskeletons - with input from their own muscles. This solution would help a number of patient groups suffering from common conditions, such as spinal cord injuries, stroke and cerebral palsy.

    To use muscle activation as input it is necessary to have a way to communicate with the mus- cles. Electromyography (EMG) is a technology used to gain information about muscle function and activation. It is performed by measuring and analyzing electrical signals conducted by the muscles during activation. Activation and activation level can be seen from analyzed EMG signal. EMG signals are frequently measured and analyzed afterwards, however, to use it as a controlling an assistive devices, real time analysis is necessary. In this thesis real time acquisi- tion and analysis of EMG was performed. The measured signal was used as an input to control a simple MATLAB computer game.

    The EMG of a muscle of the forearm, Brachioradialis, was measured with Myon Aktos sys- tem. The measured signal was written to a server as soon as the measurements were acquired. MATLAB was used to connect to the server and performing the signal analysis. The analysis was kept simple in order to limit delay.

    The result showed that it was possible to acquire real time signal with this method. The delay was negligible, both for the testing and for the game play.

    Showing that it is possible to play a game with muscle activation supports the idea of a motor that can be controlled automatically with muscle input. Future work should focus on understanding movement intent with respect to EMG and on analyzing multiple signals from different muscles at the same time.

  • Dahn, Marcus Anthony
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
    Weldegiorgish, Hiruy Michael
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
    Utveckling av en interaktiv miljö för inlärning av nya sjukhuslokaler2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Målet med detta projekt var att simulera den nya byggnaden på Södersjukhuset, ”Operation Pre/Post” för våningsplan 2 och 4. Detta skulle göras på ett sådant sätt att personalen som använde simuleringen kunde lära sig att lokalisera sig i sjukhusavdelningen innan de flyttade dit. För att göra detta möjligt har spelmotorn Unity3D använts, samt ritningar på den nya byggnaden. För att ta reda på om användare av det framtagna spelet verkligen lärde sig att orientera sig i den nya byggnaden, gjordes ett test på Södersjukhusets personal. Detta visade att det är fullt möjligt att få en inlärning av den nya sjukhusbyggnaden med hjälp av det framtagna spelet. Efter en total inlärningstid på cirka 25 minuter, visade läkarna som använt simuleringen en minskning i orienteringstid på 31,6 % i medelvärde. Från början var tanken att simulera båda våningar, men på grund av tidsbrist lyckades bara ett våningsplan skapas. Av denna anledning uppnåddes inte målet helt, vilket innebär att det finns utrymme för framtida arbete inom projektet.

  • Hersén, Nicklas
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Kennedal, Axel
    KTH, School of Electrical Engineering and Computer Science (EECS).
    The Effect of Audio Snippet Locations and Durations on Genre Classification Accuracy Using SVM2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Real world scenarios where machine learning based music genre classification could be applied includes; streaming services, music distribution platforms and automatic tagging of music libraries. Music genre classification is inherently a subjective task; there are no exact boundaries that separate different genres. Machine learning based audio classification attempts to classify audio by comparing feature vectors. Which features to extract from which parts of the audio greatly impact the classification accuracy. This paper investigates whether different audio snippet locations and durations impact the classification accuracy. A number of experiments were run across six genres, four kinds of snippet locations and eight durations. The results show that these parameters do in fact have a significant impact on the accuracy.

  • Chaodee Edwall, Tina
    et al.
    KTH, School of Industrial Engineering and Management (ITM).
    Månsson Jacobsson, Emelie
    KTH, School of Industrial Engineering and Management (ITM).
    The Impact from Sustainable Responsible Investments: A study with a focus on measurement and follow up work2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to examine the Swedish sustainable and responsible investment (SRI) market focusing on pension and life insurance companies. The purpose is to understand how the companies work with SRI and if there is a process in place to follow-up the investments and their possible impact. In the thesis a qualitative research method is conducted as the purpose is to understand the behaviour of the different companies relating to SRI. The empirical study consists of interviews with representatives from larger companies in the pension and life insurance space focusing on how they conduct their SRI work. The finding in this paper is that there are similarities regarding SRI strategies in place however the type of insurance being offered affects how they work. This thesis found that all companies follow-up their investments to ensure that they are sustainable. Further the process of measuring the impact of SRI is very much still in its early stage but there are initiatives taken to measure both soft and hard measurements. The future of the SRI market seems to be moving towards more transparency, both from possible legislation as well as initiatives. The other key area of focus when looking to the future of SRI in Sweden, is the sustainable development goals created by the UN.

  • Public defence: 2018-08-27 12:39 F3, Stockholm
    Toscani, Giulio
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Marketing and Entrepreneurship.
    UNDERSTANDING THE SPONSEE'S EXPERIENCE: AN ASSESSMENT OF THE SPONSOR-SPONSEE RELATIONSHIP2018Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Sponsorship is the fastest-growing marketing communication tool, both in terms of

    volume and complexity. The two central players in any sponsorship arrangement are

    the sponsor and the sponsored institutions’ (sponsee). Sponsors are gradually

    increasing the amounts that they invest in sponsorships and elevating outcome

    requirements for their investments, as reflected in the large body of research

    dedicated to sponsors’ needs in terms of brand awareness, consumer loyalty and

    evaluation of results. On the other hand, the sponsees needs are relatively

    neglected, especially in the arts sector, where there has been little research focused

    on what arts sponsees require from a sponsorship arrangement. This research fills

    this gap by investigating the sponsorship process that arts sponsees go through and

    provides the first theoretical model of this process. Because of the need to

    inductively explain the process, taking into account its causes and consequences,

    the grounded theory method is used to develop a substantive theoretical model. Indepth

    interviews with 31 arts sponsorship managers, globally dispersed and with

    demonstrated experience in sponsorship, were collected, and they indicate that the

    arts sponsee’s reciprocity with a sponsor in a sponsorship interaction is a highly

    complex experience that involves both the internal arts sponsee and external

    sponsor’s actors. Within the complexity of the experience, the relationship is

    arguably not a developmentally normal experience, given arts sponsees’

    professional situations. The conclusion is that the reciprocity that arts sponsees

    experience throughout the sponsorship interaction is often not acknowledged or

    understood and would benefit from further empirical research.

  • LARSSON, KEVIN
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Hushållsprodukt för avsaltning av vatten2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Stockholm Water Technology has developed an energy efficient capacitive deionization technology (CDI) for desalination of water. This in the form of a module that during this project has been integrated into a household product. The product is aimed at consumers who rely mainly on brackish water sources.

    The water scarcity remains critical in many parts of the world and the problems associated with it are many. The early phases of this project are aimed at analyzing these issues and evaluating which of them the CDI technology could solve. Simultaneously, future users and existing markets were analyzed. A large part of this phase was centered around people who rely on brackish water, that is, water with a salinity somewhere between fresh and salt water. The situation for these people differs significantly depending on where in the world one chooses to focus and the problemsextend all the way from the Stockholm archipelago to countries such as India.

    The second phase of the project is centered around generating concept ideas and the evaluation of these. Different solutions and ideas were evaluated with the conclusions from the earlier phase in mind. The result of the phase is a product concept that is suitable for users in many parts of the world and which can be customized in a variety of ways according to specific needs. It is a product concept that can compete withdesalination products in already established markets and simultaneously opens up for new applications. The remaining part of the project is centered around transforming this concept idea into a more refined product. The result is a portable product with a storage capacity of three liters. In comparison to existing products, the product has significantbenefits in terms of water recovery, mobility, flexibility, energy efficiency andmaintenance.

    Both the work itself and this report are structured around David G. Ullman's "Mechanical Design Process".

  • LANDIN, NIKLAS
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Utsättningsvagn: För att effektivisera utsättningsmomentet i byggbranschen2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the process of marking the lines for the inner and outer walls on the newly cast concrete slab when producing new apartment buildings, there is a huge potential today to make the whole process much more effective. The purpose of this bachelor´s degree project thesis is to come up with a product concept that considerably reduces the time it takes to mark the lines for all walls to be built on a newly cast concrete slab, and to improve the working environment for those who do this work professionally on a daily basis. The desired outcome of this would be a much less time consuming and less expensive activity and enable the possibility to reduce the number of workers involved in the activity from two to just one. Reducing the number of workers will also reduce the cost for the work as a whole.

    A research phase was performed to study exactly how the line marking process is carried out today, and what relevant products and technologies there are on the market. A field trip to a construction site was carried out as well as interviews with people with experience of the linemarking process to give a clear picture of how it is done today. Some research was also done onthe robotic total stations that are used today to see if they could be integrated in the product or if they operate as a closed system.

    A number of sketches, a function- and method tree, shape- and structure variations andevaluation matrices were made and led up to the final concept that is a semi automatic wagon.The wagon looks almost like a lawn mower and is pushed forward by the user in a similar way. The wagon is equipped with a 360 degree prism that enables a robotic total station to track thewagon´s position in real time. Information about the wagon´s position is sent to the wagon from the total station and thanks to this data the wagon is able to draw the line at the exact location it should be drawn on. The only thing the user has to do is to input the position of the line to the wagon and then walk with it in a specific range around the right position. It will take approximately one hour to do the whole line marking process with this product compared to four hours if it is done as it is today. Also, the process will only need one person doing the job compared to two that is needed today. When using the wagon, there is no need to work on floor level or even bending the back or knees which makes it very ergonomically correct.

    The final concept met almost all the requirements set up in the specification so the project should be considered successful and the purpose of the project fulfilled. However, some requirements were set late in the project and they were hard to meet when the design process had gone so far as it had when the requirements came up. The most important requirement of that sort was the one saying that the product should be able to mark lines in a corner surrounded by physical obstacles. A small rearrangement of the wagon´s drawing unit would make it meet even this requirement as well.There is still a lot of work to be done on this product, that is more to consider a well developed concept at the moment.

    A lot of work is still to be done with the programming of the logic that controls the drawing unit and to connect the wagon to the controller of the total station to use the data from its output. A prototype is to be built to verify the technology´s speed and accuracy.The manufacturing part of designing the product is also remaining and it should be done in a way that enables it to be mass produced in a cheap and efficient way.

  • JANSSON, EMELIE
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    SANDBERG SALACH, MIRIAM
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Ett barnsäkert fönsterbeslag2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project was a part of the Technical Design bachelor at Royal Institute of Technology in Stockholm. The aim of the project was to develop a childproof window fitting that could easily be opened by a grown up without further physical effort.

    Today there are a lot of different kinds of childproof window fittings on the market, but only a limited number are customized for elder with impaired mobility. In the pilot study, already existing window fittings were examined by visiting building supply stores, private residences, children stores and by an information exchange with the cooperative business partner Alfaglas. At an early stage of the project a functional specification was written, in which the most important properties and functions were defined. A QFD and a modified morphological matrix were made in order to help inspiring during the phase in which the concepts were generated. In open interviews with children educators the knowledge about children's behavior was broaden. When children reach an obstacle they can’t pass, for example a childproof window handle, they use pure power as a first tool and it was also explained by the educators that children practically can open anything if they are given enough time. This was an important understanding for the coming idea generating phase.

    There were no limitations considering what kind of windows the fitting would be developed for and regulations that Boverket has developed concerning windows and window fittings were followed during the whole project. By further internet browsing, residential visits and interviews with window installers, sketches and simple prototypes led to three concepts. The concepts were; an external unit that was ought to be placed on existing windows frames, an internal fitting integrated inside the handle or in the opening mechanism and a smart solution that would be controlled by an application or a remote control.

    The concepts were compared with the functional specification and the QFD. They were also weight against each other in a matrix containing the most important criterias from the functional specification. The internal concept was the one to be further developed and different solutions were tested with simple sketches and prototypes. A handle in combination with a lock mechanism was designed with a path in which the handle had to follow in order to open the window. The fitting was constructed in a way that made it possible to install it by yourself on existing windows with espagnolette.

    The final product was a childproof window fitting that was built in a handle with a lock-function that required a 15 mm sliding movement that would make it hard for a young child to operate. A covering lid held the handle and made the sliding movement possible. The end of the handle was formed like a wrench and could thereby be used as an opening tool. A spring was attached inside the lid and made the construction spring back to its original position when the handle was re-rotated. The handle was ergonomically designed by use of a user test and anthropometric data. The inner components were formed in order to fulfill the Design For Assembly-method.

  • Public defence: 2018-09-07 13:00 FR4, Stockholm
    Larsson, Jakob C.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Laboratory x-ray fluorescence tomography2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    X-ray fluorescence (XRF) tomography is an emerging bio-imaging modality with potential for high-resolution molecular imaging in 3D. In this technique the fluorescence signal from targeted nanoparticles (NPs) is measured, providing information about the spatial distribution and concentration of the NPs inside the object. However, present laboratory XRF tomographysystems typically have limited spatial resolution (>1 mm) and suffer from long scan times and high radiation dose even at high NP concentrations, mainly due to low efficiency and poor signal-to-noise ratio (SNR). Other macroscopic biomedical imaging methods provide either structural information with high spatial resolution (e.g., CT) or functional/molecularinformation with lower resolution (e.g., PET).

    In this Thesis we present a laboratory XRF tomography system with high spatial resolution (sub-200 μm), low NP concentration and vastly reduced scan times and dose, opening up the possibilities for in vivo small-animal imaging research. The system consists of a high-brightness liquid-metal-jet microfocus x-ray source, x-ray focusing optics and two photon counting detectors. By using the source’s characteristic 24 keV line emission together with spectrally matched molybdenum NPs the Compton background is greatly reduced, increasing the SNR. Each measurement provides information about the spatial distribution and concentration of the NPs, as well as the absorption of the object. An iterative method is used to get aquantitative reconstruction of the XRF image. The reconstructed absorption and XRF images are finally combined into a single 3D overlay image.

    Using this system we have demonstrated high-resolution dual CT and XRF imaging of both phantoms and mice at radiation doses compatible with in vivo small-animal imaging.

  • LINDGREN, PIERRE
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    SJÖSTRAND, OSCAR
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Wingseat – en ergonomisk kontorsstol2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sedentary work is a recurring aspect of modern office life. Inactivity is a source of discomfort and becomes a cause of musculoskeletal disorders in the long run. These issues can be mitigated by improving one's ergonomics while working. The aim of this project was to develop an ergonomic office chair reducing the effort of sitting properly and activating the body. The chair's appearance must fit in different office environments and look familiar enough as to not deter users. After reviewing studies and ergonomic literature, as well as conducting user interviews, the conclusion is drawn that discomfort and the risk of developing musculoskeletal disorders are affected by a lack of frequent variation in sitting positions. Additionally, these problems were linked to users' lack of knowledge regarding good ergonomic sitting practices.The result of the following product development process is an office chair concept that offers a simple way of switching positions, attaining ergonomic benefits without any need for pre-requisite knowledge about the subject. Thanks to its simple operation, the switch is easy to make use of. The seat features flexible parts that fold under the weight of the user's legs, causing their lower back to arch and improving their posture. The chair also provides the option to sit normally thanks to a set of supports that can be folded in under these flexible parts.

  • LINDER, FELICIA
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    WALLNER, HANNA
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Ski Ladder: Bekvämare lasting i takbox2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A project has been performed as a bachelor’s degree thesis in engineering design at Royal Institute of Technology in Stockholm. With Thule as cooperation partner, the objective withthis project was to develop a product that makes it easier to load, and unload a roof box. Thuleis a market leading company within the roof box industry and has the ambition to simplify transportation of outdoor activity gear and that way help their customers live an active life [1].

    The idea of the project was founded upon a thesis that people experience discomfort when loading their roof boxes. Initially, a substantial and thorough pre-study was performed. This included a survey, interviews, observations and information retrieval. The focus of the study was mainly to gain information about the usage of roof boxes, but also about when and how often they are used. In addition to this, the study also intended to provide knowledge within almost everything that has to do with roof boxes; types of cars, roof racks, rails, parking spaces and loading equipment. With the pre-study as a foundation, an analysis was made, where upon requirements and guidelines for the development process could be defined.

    Ideas were generated by sketching, brainstorming and tests using simple models. This resulted in three concepts that, through different technical principles, solve the defined problem; The Gantry, The Ladder and The Tilter. After thorough evaluation, The Ladder was established to be the most suitable concept for further development.

    The project eventually resulted in a product, given the name Ski Ladder, consisting of two main components; a stem assembled between the roof racks, and a telescopic ladder that rests against the stem. The telescopic ladder extends and retracts through a single push of a button. In its extended position, the ladder measures 320 mm wide and 1850 mm long, and in its folded state 320 mm wide and 650 mm long. The ladder´s foundation consists of a double set of 7 sections of aluminum pipes, interconnected through four footsteps and four handles. The stem is rotatable and has two positions; vertical when not in use, and horizontal when supporting the telescopic ladder. It is designed to stretch 200 mm from the roof racks in its horizontal position.

    The product solves the problem that was identified in the beginning of this project; discomfort when loading a roof box. The solution allows the user to reduce the distance to the load surface with up to 970 mm.

  • HÄLLJE, ARVID
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    OLIN, ANTON JOHNNER
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Trangia Iris2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    At present, Trangia is the only large company that develops and produces outdoor stoves driven by a spirit burner. The spirit burner comes with a product meant for regulating the flame, which is suffering several failings, mainly being troublesome and risky to handle. For this reason the goal with this project is to develop a new product for regulating the existing spirit burner.Trangia is selling more spirit-driven stoves than gas driven ones and are practically alone on that market. This implies that it potentially would be favourable to develop a product that improves the experience of using spirit driven outdoor stoves.

    This project has mainly been carried out through own studies but also along Trangias guidelines and wishes. With the use of well known methods concerning design and product development the process has gone from research to a completely realised product. The work is parted into three phases. The first consists of research and gathering information, the second is conceptual exploration and the third development and construction. The resources has been approximately split equal between these phases.

    The purpose of this work has been to explore Trangias possibilities to develop a new product to regulate the spirit burner while the goal has been to realise a complete product that fulfills given demands and is compatible with Trangias already existing components.

    The first phase included analyzing the market, creating personas and a customer journey, carrying out a user study with interview and lastly, defining a specification of requirements. Next, phase two were initiated with collecting as many ideas as possible to gather a pool of possible concepts.

    After generating a broad spectrum of ideas and furthermore function-modelling, about ten ideas were considered possible. Among these about half were eliminated wherafter three of the remaining were selected. These three all followed different principles and were developed sideby side for a shorter time. Finally the concept that later was named Iris was selected.

    The result was a product which function is based on a mechanism that works through linked and rotational joints. This lets the regulation run from fully open to completely shut, steplessly and without the need of mounting or dismounting any component in the process. The way of operating is as simple as rotating the upper wind cover with the tool that comes with all Trangia stoves. A spring that causes friction against the wind cover translates the rotational motion to the linked mechanism. The product was first designed as a function model. Later it was drawn more accurately with CAD and lastly it was constructed as a physical prototype.

  • EKSTRÖM, MARCUS
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    NIEMI, DANIEL
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Moonisic2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis is conducted in Technical design at Royal Institute of Technology in cooperation with a company called Mooni International. The assignment was to make a speaker combined with lantern that fits their product range while challenges their design and is directed to an alternative target group. Their current product is rather big and our vision was to develop a smaller product with thesame technical components and features. Our target group came to be younger than their current andhave an active lifestyle where they often spend time in a park or on adventure. Our goal was topackage what Mooni have already done in a small and portable format without compromising on their quality regarding light and sound.

    The project started out with market analysis, interviews and discussions with multiple different people.During the market analysis we got the impression that it was not many products that had light and sound combined. The focus in this project was to explore as many shapes and solutions as possible to find the best way to package their technology and experience as effectively as possible. Through sketches, prototypes and 3D models we generated three different concepts. Of them three there was one who stood out a little bit more, our concept “TriCircle”. It was the smallest of them all with the possibility to be very simple to handle and with an interesting design. The design was inspired by simple geometrical shapes that merged together in a compact and beautiful package.

    To develop the concept further we have looked at different aspects of the products. We have made meticulous research in the handling of the products and how it have to be designed to make it into production. A complete cost analysis has been made were it meets a satisfying level together with an informative and smart packaging.

    The final product is a good result seen to the assignment; It’s compact, versatile, easy to handle and have all of the core features that is now used in the bigger Mooni products. It’s an attractive calculated manufacturing price of 75.51 SEK that makes it possible to market it out to consumers in a very goodprice point. “TriCircle” have the possibility to make an impact and be seen on many picnic blankets ahead.

  • DE GEER, DANIEL
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    LAVRELL, MIKAELA
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    AR-glasögon för personer med kognitiva svårigheter2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Dementia is a collective name for brain damage that affects the brain's function of processing information and knowledge. Today, there are about 160 000 people with dementia in Sweden and even when possible means are many, they are insufficient in their support. The purpose of this project was to develop a hardware that would be adapted to an Augmented Reality (AR) aid for people with dementia to provide the conditions for a more independent life, and increase physical and mental well-being. The AR aid is developed by memoARand is supposed to provide support in everyday life through navigation, face recognition, reminders, action, cooking and conversation. By adapting existing knowledge in dementia and AR technology, the aid would be effectively integrated into a product in the form of Augmented Reality glasses. As preliminary work, literature studies, questionnaires, medical reports and lectures that examined dementia have been investigated and common problem areas identified. Meetings with the Dementia Association have also been made to get a first-hand perspective on the practical measures that are being used today and how they affect the everyday lives of a person with dementia.

    The technical part of the work has been investigated by making a “State of the art” where existing models have been studied, from which both the recurring components present in all the products that are needed for the technology to work properly, to the components with technical purpose specific to different attributes.

    Typical of dementia diseases is impairment of memory, language, perception of time and orientation, but research showed that support for orientation would have the greatest impact both physically and mentally and was therefore the function that became the main focus of the project. User friendliness and discretion were very important to the target group, which was the basis for the evaluations of the technology.

    This resulted in three concepts that could then be combined into a conceptual selection, tailored to the needs of the target group. The final concept was a pair of glasses with an intuitive user interface in the form of voice control and simple buttons and a discrete design that provides sight correction and bypasses some hearing deficiencies.

  • ALIN, SIMON
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    RYBO, FRIDA
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Naturtoalett2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Manure and human urine has a similar mixture of NPK, short for nitrogen, phosphorus and potassium, but only a small fraction of the urine in the toilets is utilized today. A problem is the nitrogen that is released when urine is drying, which creates ammonia that leads to bad smells.The Swedish Agriculture University has found a solution to this, a chemical process where the nitrogen is tied.

    In almost every toilet, urine and faeces are mixed and in many toilets waste is transported with huge amounts of water which needs an energy-consuming treatment plant. Harvest Moon has taken use of the chemical process of the Swedish Agriculture University and developed a dehydration unit that transforms urine to manure. The company has given the task to use their dehydration unit and develop an independent public toilet that does not need electricity or a water supply and has a small environmental impact.

    To define the market needs, renters of portable toilets and their customers were interviewed. This gave the insight that transportation of the portable toilets is an issue for technically advanced products. However, national parks and other natural sites usually has permanent installations without electricity or water supply, which suits the project better. Today, national parks often use composting toilets which are not able to compost the waste when there is a big amount of visitors. That leads to bad smells and the need of frequent service. A white space was found on the market for a toilet that is capable of handling many visitors but which does not rely on a well developed infrastructure and has a small environmental impact.

    To make use of the nutrition, urine and faeces needs to be separated. On existing toilets, this is solved by letting the toilet have an urine bowl in the front of the toilet. Interviews with toilet operators at National Parks showed that the existing urine separating devices rarely works in public toilets because paper and other litter is placed in the urine bowl, which prevents the urine flow and the bowl overflows. In addition to this problem, other options regarding flushing, containers for faeces, preventing urine in the faeces container and leading urine were investigated.

    To divide the urine, a vertical grid underneath the front of the toilet seat is used. It works as a splash protector and collects urine. Neither paper or faeces hits the grid thanks to its position. To prevent visitors to stand up and pee into the faeces, a gap that moves when the visitors are sitting down was discussed. That idea was rejected and instead a urinal was placed on the back of the house and signs that explains the positive environmental effects of using the toilet the proper way were placed on the wall. How this will be work out in reality have not been tried out, but considering that many visitors want to take care of the nature, which has been been confirmed by national park managers, it is considered a reasonable solution.

    The dehydration is driven by solar panels and the urine is dehydrated in scalable filter cassettes.The environmental impact of the product has not been quantified but the fact that the product is able to work without electricity or water supply and that NPK is circulated are good prerequisites for a small environmental impact.

  • LUNDQVIST, ROBIN
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    SÖDER, ALFRED
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Product and Service Design.
    Nano Water: Från Havsvatten till dricksvatten2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today water treatment systems that enables the use of sea water as the main source for production of drinking water are being researched. The reason for this being that many of the water sources being used today are limited and the shortage of water around the world is extensive. The dominating desalination technique on the market is reversed osmosis which using high pressure forces water through membranes to separate water from salt. The technique is energy-consuming and other more efficient techniques are being developed.

    This project focuses on the development of a product that incorporates a new energy efficient technique that has been developed by two scientists at KTH. This technique uses an electric potential over two electrodes to extract charged particles from the saline water to produce drinkable water. The technique is called CDI, short for capacitive deionization. Similar techniques for water treatment are used on the international market where the leading companies are Dutch Voltea Inc. and American Atlantis Technologies.

    The scientist behind the technique has established a partnership with KTH innovation that during the spring of 2018 involved students doing their bachelors degree project within technical design.

    The student project consisted of the development of a product for the Swedish household market which incorporates this technique. The product is part of a bigger system where sea water from the Baltic sea is used for the production of drinking water. The target group for the product are citizens without access to municipal water.

    After thorough research the archipelago of Stockholm was chosen as the target area as many citizens either lack access to municipal water, lack access to drinking water or experience problems with existing water wells. Studies on salinity in the area were conducted to establish a solid ground for capacity calculations of the technique. The scientists had suggestions on how to operate the system which were then further developed into one with increased performance.

    The project has resulted in a modular based water treatment system which can be adapted to variation in demand. The modular system consists of three units, a control unit, a filtration unit and a reservoir unit that together constitute a complete system. The final product is capable of cleaning sea water in the archipelago of Stockholm to drinking water quality approved by legal requirements set by Livsmedelsverket. The product is a household product made to fit within a home environment. A standard setup for four persons has dimensions H1410 x B940 x D720 (mm) and a minimalistic design with a light grey colour. The units are all constructed with similar components to optimize both warehousing and manufacturing costs. The system works on a theoretical level but needs testing before being sold on the Swedish market.

  • Soares, Rudi
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electric Power and Energy Systems. KTH.
    Bessman, Alexander
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Wallmark, Oskar
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Lindbergh, Göran
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Svens, Pontus
    Scania.
    An Experimental Setup with Alternating Current Capability for Evaluating Large Lithium-Ion Battery Cells2018In: BatteriesArticle in journal (Refereed)
    Abstract [en]

    In the majority of applications using lithium-ion batteries, batteries are exposed to some harmonic content apart from the main charging/discharging current. The understanding of the effects that alternating currents have on batteries requires specific characterization methods and accurate measurement equipment. The lack of commercial battery testers with high alternating current capability simultaneously to the ability of operating at frequencies above 200 Hz, led to the design of the presented experimental setup. Additionally, the experimental setup expands the state-of-the-art of lithium-ion batteries testers by incorporating relevant lithium-ion battery cell characterization routines, namely hybrid pulse power current, incremental capacity analysis and galvanic intermittent titration technique. In this paper the hardware and the measurement capabilities of the experimental setup are presented. Moreover, the measurements errors due to the setup’s instruments were analysed to ensure lithium-ion batteries cell characterization quality. Finally, this paper presents preliminary results of capacity fade tests where 28 Ah cells were cycled with and without the injection of 21 A alternating at 1 kHz. Up to 300 cycles, no significant fade in cell capacity may be measured, meaning that alternating currents may not be as harmful for lithium-ion batteries as considered so far.

  • Björnsdóttir, Jóhanna Eir
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
    Jóhannsson, Jóhann Björn
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
    Moisture Content and Mould Risk in Concrete Outer Walls2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Previous studies on the typical Icelandic external wall have shown thatcondensation occurs at the interior surface of the concrete and field inspectionshave supported this conclusion. The primary objective ofthis study is to analyse the hygrothermal behaviour of the typical Icelandicwall and evaluate the mould risk at the interior surface of theconcrete.A comparative study is performed to compare the hygrothermalperformance and mould growth risk of two concrete outer wall structureswith interior and exterior insulation, by performing a parametricstudy using the simulation program WUFI® Pro.Additional parametric studies are performed in order to analyse theeffect of various material properties of the Icelandic building materialson the hygrothermal behaviour of the wall. This part also utilizedWUFI® Pro.To investigate the thermal bridge of the Icelandic wall, simulationswere conducted with the COMSOL Multiphysics software to evaluatethe linear thermal bridge and the risk of condensation at the joint.Lastly, an experiment was set up at the Innovation Center Iceland tomodel the interior insulated wall-slab section. The experimental setupwas completed during this time but the results will be analysedfurther after the thesis work.The results from this study indicate that the typical Icelandic wall ismore sensitive to rain than to interior moisture load and that no condensationoccurs within the wall structure. As concrete is inorganic,the risk of mould growth in the wall structure is limited, however,with increased driving rain load the mould risk increases. The resultsalso revealed that the moisture content of the interior insulated wallwas a great deal higher compared to the exterior insulated wall. Furthermore,the humidity level at the interior surface of the concrete inthe interior insulated wall exceeded the recommended critical humiditylevel based on general suggestions. Finally, results indicated thatusing a more dense concrete resulted in higher relative humidity at theinterior surface but a lower total water content of the wall.

  • Public defence: 2018-09-21 10:00 Videoconferencing Sal C, Kista
    Apolonia, Nuno
    KTH, School of Information and Communication Technology (ICT). Universitat Politecnica de Catalunya (UPC) Barcelona, Spain.
    On Service Optimization in Community Network Micro-Clouds2018Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Internet coverage in the world is still weak and local communities are required to come together and build their own network infrastructures. People collaborate for the common goal of accessing the Internet and cloud services by building Community networks (CNs).The use of Internet cloud services has grown over the last decade. Community network cloud infrastructures (i.e. micro-clouds) have been introduced to run services inside the network, without the need to consume them from the Internet. CN micro-clouds aims for not only an improved service performance, but also an entry point for an alternative to Internet cloud services in CNs. However, the adaptation of the services to be used in CN micro-clouds have their own challenges since the use of low-capacity devices and wireless connections without a central management is predominant in CNs. Further, large and irregular topology of the network, high software and hardware diversity and different service requirements in CNs, makes the CN micro-clouds a challenging environment to run local services, and to achieve service performance and quality similar to Internet cloud services. In this thesis, our main objective is the optimization of services (performance, quality) in CN micro-clouds, facilitating entrance to other services and motivating members to make use of CN micro-cloud services as an alternative to Internet services. We present an approach to handle services in CN micro-cloud environments in order to improve service performance and quality that can be approximated to Internet services, while also giving to the community motivation to use CN micro-cloud services. Furthermore, we break the problem into different levels (resource, service and middleware), propose a model that provides improvements for each level and contribute with information that helps to support the improvements (in terms of service performance and quality) in the other levels.At the resource level, we facilitate the use of community devices by utilizing virtualization techniques that isolate and manage CN micro-cloud services in order to have a multi-purpose environment that fosters services in the CN micro-cloud environment.At the service level, we build a monitoring tool tailored for CN micro-clouds that helps us to analyze service behavior and performance in CN micro-clouds. Subsequently, the information gathered enables adaptation of the services to the environment in order to improve their quality and performance under CN environments. At the middleware level, we build overlay networks as the main communication system according to the social information in order to improve paths and routes of the nodes, and improve transmission of data across the network by utilizing the relationships already established in the social network or community of practices that are related to the CNs. Therefore, service performance in CN micro-clouds can become more stable with respect to resource usage, performance and user perceived quality.

  • Lee, Divian Chee Weng
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Mahmud, Tiasha
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    En kompakt fleroperationsmaskin2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Delilovic, Lejla
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Kvist, Nicole
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Effektivisering av rumsutnyttjandet på barnavdelningen Albatross, Karolinska Universitetssjukhuset Huddinge2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The staff at the children's ward Albatross, Karolinska University Hospital in Huddinge, have identified a need to access information about the number of vacant and occupied rooms in the department in a user-friendly and easily accessible way. Suggestions for a visual digital solution to the department could help create more efficient work. Karolinska University Hospital has currently no solution to forfill this need. The project described in this report is about developing a proposal model to try to forfill the needs of the staff. The model design was based on the staff's wishes for room displaying. The model was created on the basis of discussion with healthcare professionals, an observation study and an analysis of data from Karolinska's journal system, TakeCare. Inspiration for the model was taken from an existing prototype on the Unit Strategic Health Care and Care Production, Karolinska Solna. The work resulted in a space display model created in Tableau Software and integrated with a motion sensor. The model can detect movement activity in a room and present this activity in the Table View model in Tableau. However, this model can not currently display for who is in the room or if the room has been subscribed. In order to meet these criteria, the proposal model needs to be developed more extensively. This is potential further work in the field.

  • Jerresand, Mikaela
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Skogh, Ellen
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Smart and Robust Energy Infrastructure for the Future: Electric Vehicle Adoption2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As EU environmental regulations become increasingly stricter and due to Sweden's ambition to move towards a more sustainable future, the adoption of electric vehicles in society is a key factor for success. In this report, previous studies on future scenarios for the adoption has been analysed, followed by a literature study on electric vehicles. The literature study was conducted with the aim of mapping factors that may affect a future adoption of electric vehicles in Stockholm, Sweden. The principal areas in the report are political, economic, social and technical aspects of the adoption. Within these aspects, subtopics have been investigated, such as Swedish law, electricity prices and battery technology. The discovered factors have been categorized and ranked according to their assumed influence based on the literature study, and to what extent the factors affect each other and the implementation.

    Factors considered important for the future of the electric vehicles were those related to driving distance and battery capacity, as well as factors relating to the cost of buying and owning one. Another factor that proved important for future implementation was the general knowledge of the electric vehicles in the society.

    A SWOT analysis was performed to link the factors to each other, evaluate their impact on one another and the adoption. Based on the survey, eight possible future scenarios for Stockholm were identified. These were then evaluated based on the found future scenarios, the literature study and the ranking of the identified influencing factors before the conclusion was drawn that a future adoption in Stockholm is fully possible and that we in a near future will see a significant increase of electric vehicles in the streets.

  • Brew, Anton
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Stjernberg, Henrik
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Externaliteters roll i framtida produktionskostnader: En djupdykning i USA med fokus på solkraft och naturgas2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The US belong to the top 20 countries in the world when sorted by energy consumption per capita, well above Sweden. Despite renewables and sustainable development being on the agenda for most developed countries the US continues to rely on fossil fuels for electrical generation. Compare to the EU, the US has a deep resentment of government meddling in industries and business. Special taxes and fees are frowned upon greatly. The EU introduced trading emission allowances between member states in an attempt to sway electrical companies and other energy intensive industries towards proverbial greener pastures. This is widely regarded as a huge market failure as very few companies changed their mindset and instead opted to produce less to avoid these taxes. Despite the failure this was an honest attempt to steer development towards more sustainable options. This study intends to analyse the external costs associated with electrical production from natural gas and solar power.

    While it is improbable that all the associated damage costs and such would be attributed to the company producing the electricity this study hopes to shed some light on just how big these potential costs are. By combining past studies on damage costs with current forecasts made by the Energy Information Agency of the United States on future cost of generation we intend to show a bigger picture.

    Our analysis finds in both cases that damage costs are just as high as the cost of generation. In the case of solar we find this highly doubtful, mainly since the damage costs calculated are based on technology from the late eighties. We believe that further research is needed in this area since most research today focuses solely on the aspect of global warming.

    We present a continuous prognosis that ends in 2040. Key findings are that today the potential damage costs of natural gas are around 4 cents per kWh electricity, compare this to the current cost of generation at 4,8 cents. In the case of solar the damage costs today are 2,7 cents compared to a generation cost of 4,7 cents per kWh.

    Simply updating the efficiencies of solar panels to today’s number yields a wholly different result, this is however bases on the fact that a doubling in performance reduces damage costs by half.

  • Noralm, Yasa
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Integrated Product Development.
    Taki, Noor
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Integrated Product Development.
    Mojligheter och utmaningar med produktplattformar2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Att kunna leva upp till de flesta kunders behov samtidigt som att vara i framkanten av dagens snabba teknikutveckling med effektiva tillverkningsmetoder där pengar och resurser sparas kan upplevas som väldigt utmanande. Företag strävar efter metoder som kan uppfylla alla de tre ovannämnda faktorerna. En metod som är ganska intressant inom ämnet kallas för produktplattformar. Produktplattformar är något som används inom olika industrier och för olika slutprodukter som bilar, verktyg, generatorer, grävmaskiner, surfplattor och många andra produkter. Användningen av produktplattformar innebär att produkter deriveras från en gemensam uppsättning av komponenter och tillverkningsprocesser. Produktplattformar kan alltså ses som en divergent metod vad gäller skapandet av produkter och värde till kunden. Avsikten är att etablera en skalbarhet och bandbredd genom en gemensamhet bland en uppsättning produkter.

    Med produktplattformar strävar man att uppnå produktvariation med så lite spendering av resurser som möjligt. På grund av dessa anledningar är produktplattformar relevant att ta hänsyn till från ett effektiviseringsperspektiv. Avsikten med detta arbete är att undersöka hur applikationen av produktplattformsbaserade produkter skiljer sig i olika företag och dessutom vilka eventuella möjligheter och utmaningar som uppkommer som konsekvens av plattformsarbetet. Syftet med arbetet är att analysera och belysa de nämnda delarna av ämnet för att öka förståelsen av produktplattformar. Mer specifikt behandlar denna studie vilka möjligheter och utmaningar som uppkommer vid användandet av produktplattformar i produktutvecklingsprocessen.

    Studien inleds med en litteratursökning om produktplattformar för att etablera en teoretisk grund att utgå ifrån. Sedan presenteras en kvalitativ studie i form av intervjuer med olika produktutvecklande företag som använder sig av produktplattformar. Intervjuerna ger en inblick i hur produktplattformar används i praktiken och utgör sedan en empiri att jämföra med den teoretiska datan som etablerats. Dessutom utförs en analys av den empiriska datan som återkopplar till den presenterade litteraturstudien. På sådant sätt utgör analysen en jämförelse av teorin och praktiken (empirin) så att slutsatser kan dras om vilka möjligheter och utmaningar som skapas med produktplattformar.

    Analyserna av resultaten jämför de kvalitativa studierna med den etablerade teorin där utmaningarna och möjligheterna med produktplattformar i näringslivet identifieras. Därefter diskuteras det även om varför resultatet blev som det blev och författarnas reflektioner av analysen. Slutligen sammanställs de slutsatser som kunde dras från den utförda studien. Slutsatserna som dragits med avseende på möjligheter är att resurser besparas, ett bredare kundspann skapas och att produktstödet förenklas. Slutsatserna med avseende på utmaningar visade sig vara hanteringen av entydigheten i ett projekt, kommunikationen och koordineringen mellan team, trade-off mellan bandbredd och skalbarhet av plattformen. Dessutom även ändringar i kundkrav, snabb utveckling av teknik och yttre parters påverkan som till exempel ett tillverkningsföretag som förser komponenter till en plattform.

  • Bunpuckdee, Bhadin
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Svensson, Philip
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Tairlbahre, Zakaria
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Study of a Small Scale Combined Pumped Water Storage and Compressed Air2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The recent developments in renewable energy has led to an increasing demand for energy storage capability. This report aims to combine two of the most widely used methods: Pumped Hydro Energy Storage and Compressed Air Energy Storage. By using a closed pressure vessel of 200 m 3, the system stores energy in the form of compressed air and gravitational potential energy of water.

    Two different charging and discharging methods were investigated to examine the behaviour of the proposed small-scale model, one "slow process" and one "fast process". In the first one, water is pumped up and let out in increments and heat transfer is considered between each step. The other case assumes a constant flow of water with no heat transfer except when the tank is full.

    The best efficiency found was 70.7 % for the slow process. It was shown that the fast process could reach a higher efficiency if the storage time between charge and discharge was low. With a pump and turbine efficiency of 90 % each, an equivalent Pumped Hydro Energy Storage system would have 81 % efficiency. Although the energy density increases, the economic study concludes that the system is not worth investing in compared to other small scale energy storage systems like BESS.

  • NORDSTRÖM, CAROLINA
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    STENBERG FORSBERG, IDA
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Modelling the national electricity system of Rwanda: Contribution to the achievement of Sustainable Development Goal 72018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    For a society to function in a modern and prosperous way, electricity is a fundamental necessity. Access to electricity enhances the living standard of the population by generating positive synergies such as more people proceeding in education, economic growth and stability, improved welfare and collaborations with other nations. As the global population grows and the use of electricity increases, it is of great importance to increase the share of renewable energy resources in the energy mix to decelerate the climate change altered by greenhouse gas emissions.

    Rwanda is a small, landlocked country in East Africa with ambitious plans to electrify its full population of about 11.9 million by 2024 and to become a low-carbon economy. Today merely 41% of the population has access to basic electricity, where 30% are connected to the national grid and 11% are electrified by off-grid solutions. Rwanda is working with national strategies such as Vision 2020, Energy Sector Strategic Plan and National Energy policy to achieve their goals. These

    policies comprise, among others, United Nations’ Sustainable Development Goals and their Intended Nationally Determined Contributions. Rwanda is also a member of the Eastern African Power Pool, which enhances their future possibilities of expanded collaboration with neighbouring countries in terms of electricity trading.

    This study aims to analyse the national electricity sector of Rwanda, both the current state and future outlooks, to contribute to their achievement of the Sustainable Development Goal 7 - Affordable and Clean Energy for All (SDG 7). The overall aim of the study is to find an energy

    mix which benefit Rwanda’s society, environment and economy. The objective of the thesis is to collect data about Rwanda’s electricity system and national policies through a field study in Kigali. The collected data is then compiled, and seven scenarios are modelled by using the tool OSeMOSYS through MoManI. The scenarios portray Rwanda’s work with national policies, potential exports and how the energy mix is affected when the price for photovoltaic decreases.

    The results show the importance of hydropower in Rwanda’s electrification system and how it in

    the majority of the scenarios constitutes for the largest share in the energy mix. The exports scenarios combined with national policies have a higher total system cost while scenarios with merely exports have either the same total system cost as the business as usual scenario or a bit lower. In four out of seven scenarios electricity access for all inhabitants is ensured by 2024 and SDG 7 is achieved. Based on this study, Rwanda needs to limit their national emissions, invest in more renewables and expand the national grid as well as providing rural areas with off-grid solutions to achieve SDG 7.

  • Hagberg, Philip
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Henriksson, Jesper
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Förbättring av nedgångslucka på en segelbåt2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Luo, Yi
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Gaming at work to save energy - Supporting behavioural change of occupants through cooperative games2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Commercial buildings are one of the main contributors to energy consumption while both energy management and occupants’ consumption behaviour play crucial roles in how energy is consumed. This study explored the energy awareness of occupants in a commercial building with the goal to investigate how increased awareness could support behaviour change. For this purpose, a cooperative gamified visualization of energy consumption data, “EnerSpace”, is designed, implemented and evaluated. 8 occupants participated in this study who experienced a one-week baseline period and a one-week “EnerSpace” game period. In EnerSpace, the participants were divided into two teams and powered a spaceship with their energy saving respectively on a resource exploitation trip to Mars. Each participant had an avatar in the spaceship who introduced the participant’s personal consumption data. The energy conservation of the participants affects the moving speed of the spaceship and the living condition of their avatars. Participants were rewarded by a postcard sent by the avatars when reaching a destination. The results showed that the participants 1) decreased their energy consumption, 2) reported a fun and engaging experience with EnerSpace, and 3) felt motivated for energy conservation by different motives. This study indicated a potential for energy saving in a commercial building using a cooperative game. 

  • Serra, Michelle
    KTH, School of Electrical Engineering and Computer Science (EECS).
    An exploratory paper of the privacy paradox in the age of big data and emerging technologies2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Technological innovations and advancements are helping people gain an increasingly comfortable life, as well as expand their social capital through online networks by offering individual's new opportunities to share personal information. By collecting vast amounts of data a whole new range of services can be offered, information can be collected and compared, and a new level of individualization can be reached. However, with these new technical capacities comes the omnipresence of various devices gathering data, potential threats to privacy, and individuals' increasing concern over data privacy. This paper aims to shed light on the 'privacy paradox' phenomenon, the dichotomy between privacy attitude, concern, and behavior, by examining previous literature as well as using an online survey (N=463). The findings indicate that there is a difference between attitude, concern, and actual behavior. While individuals' value their data privacy and are concerned about information collected on them, few take action to protect it and actions rarely align with expressed concerns. However, the 'privacy paradox' is a complex phenomenon and it requires further research, especially with the implications of a data driven society and when introducing emerging technologies such as Artificial Intelligence and Internet of Things.

  • Gebremeskel, Ermias
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Analysis and Comparison of Distributed Training Techniques for Deep Neural Networks in a Dynamic Environment2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Deep learning models' prediction accuracy tends to improve with the size of the model. The implications being that the amount of computational power needed to train models is continuously increasing. Distributed deep learning training tries to address this issue by spreading the computational load onto several devices. In theory, distributing computation onto N devices should give a performance improvement of xN. Yet, in reality the performance improvement is rarely xN, due to communication and other overheads. This thesis will study the communication overhead incurred when distributing deep learning training.

    Hopsworks is a platform designed for data science. The purpose of this work is to explore a feasible way of deploying distributed deep learning training on a shared cluster and analyzing the performance of different distributed deep learning algorithms to be used on this platform.

    The findings of this study show that bandwidth-optimal communication algorithms like ring all-reduce scales better than many-to-one communication algorithms like parameter server, but were less fault tolerant. Furthermore, system usage statistics collected revealed a network bottleneck when training is distributed on multiple machines. This work also shows that it is possible to run MPI on a hadoop cluster by building a prototype that orchestrates resource allocation, deployment, and monitoring of MPI based training jobs. Even though the experiments did not cover different cluster configurations, the results are still relevant in showing what considerations need to be made when distributing deep learning training.