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  • 1.
    Abdirahman, Khalid
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Förnberg, Sebastian
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Styrsystem för solcellsladdade batterier2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The use of solar cells is continuously increasing in Sweden and the powergenerated by the solar cells is usually stored in lead acid batteries. These batterieshave a bad impact on the environment as much energy and environmentallyhazardous materials like lead and sulfuric acid are required to manufacture thesebatteries. Östersjökompaniet AB and many of its customers realize the importanceof sustainable thinking and were interested in knowing if it was possible tomaximize the lifetime of these batteries. During the course of the work, differentmethods of battery charging and discharging were analyzed that could affect thebatteries lifetime and how to take care of them to optimize them. A chargecontroller was used to optimize the charge of the battery. To calculate theremaining state of charge in the battery, the Extended voltmeter method was used.A prototype that was able to charge the batteries optimally, warn when the batterycapacity became too low, and a user-friendly application for battery monitoring wasdesigned. The calculated lifetime of a battery is not an exact science. According tostudies the lifetime of a battery can be doubled if it is c

  • 2.
    Ahluwalia, A.
    et al.
    Italy.
    De Maria, C.
    Italy.
    Lantada, A. D.
    Spain.
    Pietro, L. D.
    Italy.
    Ravizza, A.
    Italy.
    Mridha, Mannan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Madete, J.
    Kenya.
    Makobore, P. N.
    Uganda.
    Aabloo, A.
    Estonia.
    Kitsing, R.
    Estonia.
    Leivobits, A.
    Estonia.
    Towards open source medical devices current situation, inspiring advances and challenges2018In: BIODEVICES 2018 - 11th International Conference on Biomedical Electronics and Devices, Proceedings; Part of 11th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2018, SciTePress, 2018, p. 141-149Conference paper (Refereed)
    Abstract [en]

    Open Source Medical Devices may be part of the solution towards the democratization of medical technologies pursuing Universal Health Coverage as part of the Sustainable Development Goals for United Nations. Recent technological advances, especially in information and communication technologies, combined with innovative collaborative design methodologies and manufacturing techniques allow for the mass-personalization of biodevices and help to optimize the related development times and costs, while keeping safety in the foreground through the whole life cycle of medical products. These advantages can be further promoted by adequately fostering collaboration, communication, high value information exchange, and sustainable partnerships and by extending the employment of open source strategies. To this end, within the UBORA project, we are developing a framework for training the biomedical engineers of the future in open-source collaborative design strategies and for supporting the sharing of information and the assessment of safety and efficacy in novel biodevices. An essential part of this open-source collaborative framework is the UBORA e-infrastructure, which is presented in this study, together with some initial success cases. Main future challenges, connected with regulatory harmonization, with educational issues and with accessible and open design and manufacturing resources, among others, are also presented and discussed.

  • 3.
    Ahluwalia, Arti
    et al.
    Univ Pisa, Dept Ingn Informaz, Bioengn, Pisa, Italy..
    De Maria, Carmelo
    Univ Pisa, Dept Ingn Informaz, Bioengn, Pisa, Italy..
    Diaz Lantada, Andres
    UPM, ETSII, Dept Mech Engn, Madrid, Spain..
    Madete, June
    Univ Pisa, Res Ctr E Piaggio, Pisa, Italy.;Kenyatta Univ, Nairobi, Kenya..
    Makobore, Philippa Ngaju
    Uganda Ind Res Inst, Instrumentat Div, Kampala, Uganda..
    Ravizza, Alice
    Univ Pisa, Pisa, Italy..
    Di Pietro, Licia
    Mridha, Mannan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Munoz-Guijosa, Juan Manuel
    UPM, ETSII, Dept Mech Engn, Madrid, Spain..
    Tanarro, Enrique Chacon
    UPM, ETSII, Dept Mech Engn, Madrid, Spain..
    Torop, Janno
    Tartu Ulikool, Inst Technol, Tartu, Estonia..
    Biomedical Engineering Project Based Learning: Euro-African Design School Focused on Medical Devices2018In: International Journal of Engineering ,Science and Innovative Technology, ISSN 0949-149X, E-ISSN 2277-3754, Vol. 34, no 5, p. 1709-1722Article in journal (Refereed)
    Abstract [en]

    Biomedical engineering (BME) has the potential of transforming medical care towards universal healthcare by means of the democratization of medical technology. To this end, innovative holistic approaches and multidisciplinary teams, built upon the gathering of international talent, should be encouraged within the medical industry. However, these transformations can only be accomplished if BME education also continuously evolves and focuses on the internationalization of students, the promotion of collaborative design strategies and the orientation towards context relevant medical needs. In this study we describe an international teaching-learning experience, the "UBORA (Swahili for 'excellence') Design School". During an intensive week of training and collaboration 39 engineering students lived through the complete development process for creating innovative open-source medical devices following the CDIO ("conceivedesign-implement-operate") approach and using the UBORA e-infrastructure as a co-design platform. Our post-school survey and analyses showed that this integral teaching-learning experience helped to promote professional skills and could nurture the future generation of biomedical engineers, who could transform healthcare technology through collaborative design oriented to open source medical devices.

  • 4.
    Chosrat, Ismail
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Joakim, Rödin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    GDPR i praktiken2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Med den nya dataskyddsförordningen (GDPR) i EU ställs det högre krav på hantering avpersonuppgifter och för första gången riskerar företag sanktioner om de inte hanterar personuppgifterkorrekt, vilket medför att alla organisationer måste ta ställning till hur personuppgifterskall hanteras inom organisationen. Inom IT-sektorn måste en analys utföras omvilka data som kommer att påverkas med införandet av GDPR och hur data ska hanteras inuvarande IT-system. Studien har genomförts hos företaget Primona som är placerade iStockholm där de utvecklar lösningar inom inköp och elektronisk handel.Den nya dataskyddsförordningen och relaterade arbeten har studerats tillsammans medintervjuer som utfördes på olika företag för att framställa ett lösningsförslag. Lösningsförslagethar sedan använts i ett implementeringstest i Primonas system för att visa att detfungerar. Studien innehåller även en ekonomisk analys för att fastställa betydelsen av attimplementeringen hanteras och prioriteras.Lösningsförslaget som studien tog fram har gett bevisad effekt i systemet och kan medrelativ lite resurser återanvändas för att säkerställa att en organisation vidtar tillräckligaåtgärder vid införande av GDPR.

  • 5.
    Danielsson, Jakob
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Oldenburg, Dag
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Analys av tekniska möjligheter för tredjepartsaktörer att integrera med banker2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Banks internet activity have opened new possibilities for third party actors within the fintechindustry who can now create innovative economy and payment solutions by directlyinteracting with bank accounts. A problem for the fintech companies is that there is noavailable information about what technologies are available for them to use to get access tothe banks services and which technology is the most advantageous for their purpose.In this work, the four biggest swedish banks Nordea, Handelsbanken, SEB and Swedbankhave been examined to find out what options third party actors have to integrate with thebanks services. The examination showed that fintech companies will be able to or are able touse one of the three techniques SFTP, REST or web automation. A test environment for thethree technologies was developed to simulate real use cases for fintech companies. CPU-,RAM- and network usage as well as total operating time was measured for the threetechnologies. For sending information REST was the more effective technology when it cameto lower data volumes while SFTP was the most efficient with bigger data volumes. RESTwas the most efficient for retrieving information, no matter the data volume. Web automationwas the least efficient compared to both the other technologies.

  • 6.
    De Maria, Carmelo
    et al.
    Univ Pisa, Res Ctr E Piaggio, Largo Lucio Lazzarino 1, I-56122 Pisa, Italy.;Univ Pisa, Dept Ingn Informaz, Pisa, Italy..
    Di Pietro, Licia
    Univ Pisa, Res Ctr E Piaggio, Largo Lucio Lazzarino 1, I-56122 Pisa, Italy..
    Lantada, Andres Diaz
    Univ Politecn Madrid, Mech Engn Dept, Madrid, Spain..
    Madete, June
    Kenyatta Univ, Dept Elect & Elect Engn, Nairobi, Kenya..
    Makobore, Philippa Ngaju
    Ugandan Ind Res Inst, Kampala, Uganda..
    Mridha, Mannan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Ravizza, Alice
    BioInd Pk Silvano Fumero, Turin, Italy..
    Torop, Janno
    Univ Tartu, Inst Technol, Tartu, Estonia..
    Ahluwalia, Arti
    Univ Pisa, Res Ctr E Piaggio, Largo Lucio Lazzarino 1, I-56122 Pisa, Italy.;Univ Pisa, Dept Ingn Informaz, Pisa, Italy..
    Safe innovation: On medical device legislation in Europe and Africa2018In: Health Policy and Technology, ISSN 2211-8837, E-ISSN 2211-8845, Vol. 7, no 2, p. 156-165Article in journal (Refereed)
    Abstract [en]

    Objectives: The principal motivation for regulating medical devices is to protect patients and users. Complying with regulations may result in an increase in development, manufacturing and service costs for medical companies and ultimately for healthcare providers and patients, limiting the access to adequate medical equipment. On the other hand, poor regulatory control has resulted in the use of substandard devices. This study aims at comparing the certification route that manufactures have to respect for marketing a medical device in some African Countries and in European Union. Methods: We examined and compared the current and future regulations on medical devices in the European Union and in some countries in Africa. Contextually we proposed future approaches to open design strategies supported by emerging technologies as a means to enhance economically sustainable healthcare system driven by innovation. Results: African medical device regulations have an affinity to European directives, despite the fact that the latter are particularly strict. Several states have also implemented or harmonized directives to medical device regulation, or have expressed interest in establishing them in their legislation. Open Source Medical Devices hold a great promise to reduce costs but do need a high level of supervision, to control their quality and to guarantee their respect for safety standards. Conclusion: Harmonization across the two continents could be leveraged to optimize the costs of device manufacture and sale. Regulated open design strategies can enhance economically sustainable innovation. (C) 2018 Fellowship of Postgraduate Medicine.

  • 7.
    Gannholm, Fredrik
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Optimering av selektivplaner och dessbetydelse för samhället2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In case of build out and rebuilding electricity grids, the electrical characteristicschange. This means that protection features may need to be adjusted to suit theelectrical grids’ new characteristics. Adjustments may lead to loss of selectivity betweenprotective relays. Selectivity means that only the protection device closest tothe fault break the current, so only the smallest possible part of the electrical gridgets disconnected. To assure selectivity, selective tripping schedule is created andprotective relays are adjusted if needed. Rotebro substation in Sollentuna is ownedand operated by Sollentuna Energi & Miljö (SEOM). The substation is facing rebuildingand its selective tripping schedule needs to be reviewed.Since the problem is that selectivity between the protective relays needs to bechecked the goal is to create a selective tripping schedule for Rotebro substation.This is based on the substation protective settings and the connected electricalgrids characteristics. The thesis resulted in a model of Rotebro substation createdin the computer program PSS Sincal. From this a selective tripping schedule weregenerated that shows that small adjustments of the protective relays can be made.A general analysis was also conducted which shows that a selective tripping scheduleis of great importance to the society.

  • 8.
    Gilljam, Daniel
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Youssef, Mario
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Jämförelse av artificiella neurala nätverksalgoritmerför klassificering av omdömen2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With large amount of data in the form of customer reviews, it could be time consuming to manually go through each review and decide if its sentiment is positive or negative. This thesis have been done to automatically classify client reviews to determine if a review is positive or negative. This was dealt with by machine learning. Three different deep neural network was tested on greater and lesser datasets, and compared with the help of two different frameworks, TensorFlow and Keras. Different embedding methods were tested on the neural networks. The best combination of a neural network, a framework and anembedding was the Convolutional Neural Network (CNN) which used the word embedding method Word2Vec, was written in Keras framework and gave an accuracy of approximately 88.87% with a deviation of approximately 0.4%. CNN scored a better result in all of the tests in comparison with the two other neural networks, Recurrent NeuralNetwork (RNN) and Convolutional Recurrent Neural Network (CRNN).

  • 9.
    Göker, Fuat
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Hedberg, Christoffer
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Utvärdering av faskompenseringsmetoder för ett småskaligt vattenkraftverk: Genomgång av kondensatorbatteri, aktiv och passiv reglering, övermagnetiserad synkronmaskin, SVC och STATCOM på Fröslida kraftverk2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Small scale hydropower is a big user of reactive power, mainly because of their use of asynchrounous generators. Power companies are charging their customers a fee for an extensive use of reactive power. Which gives rise to a need of correction of the power factor as well as reduction of distorsion in the network. It is also in the interest of the general public to acquire a good electric quality in terms of keeping distorsion and interruptions in the network to a minimum. This can be achieved by using different methods for power factor correction and filtration of harmonics.

    These methods have their own inherent advantages and disadvantages described after the facility’s specific needs and requirements. These methods are a capacitor bank, passive and active regulation, overexcited synchronous machine, static var compensator (SVC) and static synchronous compensator (STATCOM). Simulations and economical calculations have been used to determine these properties. A capacitor bank has been proven to be a good economical investment, but it has high transients during switching conditions. Active regulation also shows a good profitability and provides a fast, continuous regulation of the reactive power, though it has higher operating costs and low life expectancy. The overexcited synchronous generator has a positive outlook in economic terms, with the drawback of a slower response time. SVC and STATCOM are more applicable to larger facilities or weak networks.

  • 10.
    Jacobsson, Martin
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Wåhslén, Jonas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Virtual machine execution for wearables based on WebAssembly2018Conference paper (Refereed)
    Abstract [en]

    Today, the programming of a complete wearable sensor system requires writing code in different programming languages for the different parts of the systems, such as the wearable sensor platform itself, the gateway, the back-end server, and the client app. In this paper, we propose to use WebAssembly, which is a simple but powerful virtual machine standard already supported by all major web browsers. We show that it is possible to implement a WebAssembly interpreter for embedded systems, such as the Texas Instruments CC2652R system-on-chip and this enables the same code to execute in all parts of the systems. In our proof-of-concept implementation, we use Bluetooth low energy, which means that smartphones can communicate with and program our device without the need for special hardware.

  • 11.
    Kleyer, Oskar
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Holmlund, Fredrik
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Dosis: din smarta pillerdosa: Utveckling av ett inbyggt system för en dosettask2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Modern medication allows patients to be treated more efficiently if taken properly.When patients themselves are responsible for their medication, it can be wronglydosed or forgotten, which changes the conditions for its effects. Forgetfulness combinedwith impaired senses make it difficult for the patient to take care of his medication.The solution to this problem today is increased home care, where healthcare professionalshelp patients to take the right medication at the right time. A technical solutioncan be an embedded system that reminds the patient, saves missed dosages, and canprovide more information to doctors who can make more informed decisions for furthercare.The results show that a pill dispenser can be used to remind patients to take their medicationand send missed dosages with near field communication. As a microcontroller,a STM32 Nucleo was used, with a state machine as software solution. In further studies,a real-time operating system can be used. The system was programmed with Arduino'sdevelopment environment, but an alternative is IAR. The prototype of the projectcould achieve the specifications battery life with most modules, except to thesound module used. To achieve this result, two theoretical extremes were created inwhich the prototype was tested.The pill dispenser can lead to reduced waste of pills and a lower cost, as fewer homevisits are required. In addition, this results in increased independence for the patient.These factors cause the pill dispenser to contribute to increased sustainable development.

  • 12.
    Lipecki, Johan
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Lundén, Viggo
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    The Effect of Data Quantity on Dialog System Input Classification Models2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This paper researches how different amounts of data affect different word vector models for classification of dialog system user input. A hypothesis is tested that there is a data threshold for dense vector models to reach the state-of-the-art performance that have been shown with recent research, and that character-level n-gram word-vector classifiers are especially suited for Swedish classifiers–because of compounding and the character-level n-gram model ability to vectorize out-of-vocabulary words. Also, a second hypothesis is put forward that models trained with single statements are more suitable for chat user input classification than models trained with full conversations. The results are not able to support neither of our hypotheses but show that sparse vector models perform very well on the binary classification tasks used. Further, the results show that 799,544 words of data is insufficient for training dense vector models but that training the models with full conversations is sufficient for single statement classification as the single-statement- trained models do not show any improvement in classifying single statements.

  • 13.
    Lundmark, Jonathan
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Lundgren, Simon
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Adequate Usability for Simplifying Complex User Interfaces while Maintaining Functionality2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Complex interfaces can be subject to inferior usability, encompassing difficulties- to learn and handle them as well as deficient recovery from erroneous usage. This thesis seeks to establish potential measures employable to reduce the complexity of an interface, without negatively impacting functionality. Adequate usability is furthermore the highlighted stance from which to pursue potential solutions.

    Related research presented applicable knowledge in terms of clarifying usability aspects to consider when analyzing as well as designing a complex interface. Previously employed evaluation methodologies for interfaces with successful outcomes were additionally reviewed. Evaluation strategies for relevant surveys, prototypes and tests were consequently established. Succeeding literature studies, the design process of proposing an interface assembly was separated into three core phases. Initially, an interface subject to appropriate complexity was procured and investigated. The investigation resulted in an interactable prototype suitable for evaluation. Evaluation results from the prototype furthermore emitted the basis from which an actual interface implementation was developed. The accumulated results from each design phase in conjunction with acquired design knowledge, ultimately formed a set of proposed design guidelines about element distinguishment, designing for intuition and flattening of nested layers.

    The conducted design phases were concluded to incrementally have simplified a complex interface and substantially heightened usability. The constraint of maintaining functionality while reducing complexity, was exceeded by instead heightening functionality. Established and employed design guidelines, were concluded to correlate with the proven increase in usability heuristics and performance. However, which guidelines having a more drastic impact than others were inconclusive and subsequently proposed for future work to analyze further in order to potentially prioritize design considerations.

  • 14.
    Magnusson, John
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Elias, Axelsson
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    TPS and Memory Size Optimization on a Cryptocurrency’s Ledger2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    International trading has grown vigorously over decades. An increasing globalization and growing international trading are driven by multiple factors and among them technical development is central. Even though trading across borders have become simpler the economics and payment system have not kept up with the pace of development. Bitcoin was a step to a more modern economy by being the first global decentralized trustless payment system. However, issues in the technology have started to show with low transactions per second (TPS), high transaction fees, volatile value and an increasingly growing blockchain. The company Haj Enterprise aims to rise where Bitcoin falls short and create a new fast and stable cryptocurrency.

    DAG is an alternative structure to the company’s already implemented blockchain. The DAG structure compared to the blockchain can have multiple references to previous transactions. This gives the possibility to have transactions processed in parallel. The DAG structure was implemented for testing to see if it could improve the capacity of TPS and memory size in the cryptocurrency. A new serialization method and compression algorithm was created with the same motive. When testing in a simulated envoirment with the DAG structure the capacity of TPS was increased but also the volatility of the confirmation time. When tested on a global scale the blockchain performed better than the DAG structure. The blockchain also required less memory than the DAG structure. The newly created serialization method increased the capacity of TPS and the compression algorithm shrank the memory size. The compression algorithm became a bottleneck when it came to performance of TPS.

  • 15.
    Möller, Jenny
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Wiklund, Johan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Optimeringsverktyg för automatisk planering och reglering av produktion i småskaliga vattenkraftverk2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Small-scale hydropower plants are usually controlled considering either the reservoir level or the water flow, regardless of the electricity demand. This thesis was conducted on behalf of Fortum Generation that wanted to investigate the possibility to automatically optimise the production plans and control of small-scale hydropower plants based on electricity price, generator efficiency, water situation, environmental restrictions, environmental concerns, and mechanical wear. The thesis is a continuation of a study where an optimisation algorithm was developed. A prototype that could automatically plan the production and control of an individual hydropower plant would be developed, and then based on simulations it would be determined if an implementation of the algorithm in an optimisation tool is possible and profitable. Båthusströmmen, the test case for this thesis, is owned by Fortum and is a small-scale hydropower plant in Österdalälven.

    A cost-effective prototype of an optimisation tool for automated planning and control was developed and tested through simulations. The prototype was developed as a software that performs the optimisation and communicates continuously with the existing optimisation, supervisory and control system. The results of the communication tests and optimisation simulations showed that an implementation of the algorithm in an optimisation tool is possible and is expected to increase the efficiency of Båthusströmmen and therefore increase the profit of the power plant.

  • 16.
    Nilsson, Robert
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Henning, Kim
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Predictions of train delays using machine learning2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Train delays occur on a daily basis in the commuter rail of Stockholm. This means that the travellers might become delayed themselves for their particular destination. To find the most accurate method for predicting train delays, the machine learning methods decision tree with and without AdaBoost and neural network were compared with different settings. Neural network achieved the best result when used with 3 layers and 22 neurons in each layer. Its delay predictions had an average error of 122 seconds, compared to the actual delay. It might therefore be the best method for predicting train delays. However the study was very limited in time and more train departure data would need to be collected.

  • 17.
    Ntis, Christina
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Causevic, Neira
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    En utvärdering av en verktygsdriven UX-designprocess: Tillämpning och utvärdering av en verktygsdriven UX-designprocess vid användning av Kibana2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the current situation there are a lot of challenges and difficulties in the traditional design process for UX, User Experience. These challenges have an impact on how time consuming and costly a design process for UX can be. Some of them are to create prototypes that resemble the end product and communication difficulties between UX-designers and developers that follow an Agile project methodology. There are also difficulties in visualizing streaming data, as information in data must be made easy to understand for the user and the users must be able to get desired information.

    To investigate these difficulties, a design process for UX was created to be used with the Kibana data visualization tool. In order to evaluate and assess the design process for UX, an interactive dashboard was created that pre- sented data from Swedish payment stations. The development of the design process for UX resulted in an optimization of the prototype-creation and test- ing. The design process for UX enabled development of the product, instead of the prototype, which improved the testing with the end user and therefor also the end product. However, there were disadvantages when Kibana was used which were limitations in modifying the user interface and that the sys- tem needed to be ready before the UX design process could begin.

  • 18.
    Oldelius, David
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Pham, Douglas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Master Data Management-studie om nästa entiteto och leverantör för Scania2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Enterprises has different departments and the information from them needs management. Master Data Management(MDM) is an information handling system for handling information from different sources.  One entity at the time is implemented to MDM. The work's problem is to recommend the next entity to include in the MDM implementation at Scania as well as which provider fits the implementation. A recommendation of entity is prepared from materials provided by Scania and interviews with employees at Scania. A recommendation of provider is prepared from materials from the providers and interviews with the providers. The recommended entity is product as individual because information in the area needs improved management. Orchestra Networks is the recommended supplier because they are a leader among the MDM providers, they are specialised in the area and they are strong in the product information area.

  • 19.
    Oliveira Lunå, Torbjörn
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Implementation av en vibrotaktil alarmklocka: Undersökning av lämpliga input-signaler och parametrar för ett behagligt och alert uppvaknande och tillhörande utvecklingskostnader2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Driving although experiencing fatigue is a recognized traffic hazard. Today, if a driver is driving despite being tired, it is considered to be reckless driving. However, in the event of an accident, it is almost impossible to prove that the accident occurred because the driver was tired. The practical result is that it is left to the driver to decide if one is too tired or not to drive the vehicle safely. The whole situation of being a traffic hazard or not is then subjected to a subjective assessment.

    This report examines different sleep stages and methods for determining when it’s most appropriate, and how it’s most appropriate to wake up, with the aim on waking up in a more alert state. Further, to use the methods that prove to be suitable as inputs and parameters of an algorithm. The report also examines different calculations that can be used to determine the development cost of the prototype.

    The result consists of a prototype that is a beginning on addressing the problem with fatigue in traffic. It also consist of a calculation determining the development cost.

    The research and development of the technical solution has been divided into two modules and will be done in collaboration with an external student group at School of Electrical Engineering and Computer Science (EECS) at KTH Royal Institute of Technology.

  • 20.
    Ormsson, Kristinn Arnar
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Persson, Henrik
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    A commercial vehicle’s electrical startability2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In commercial vehicles, where the driver overnights with the engine turned off whilestill consuming electricity, it is important to know how much the battery can bedischarged before reliable engine starting is at risk. The vehicle’s ability to crank theengine, i.e. startability, changes with the vehicle’s ambient temperature and thebatteries state of charge. The aim of this project is therefore to test the startability ofa commercial vehicle and its cranking system’s behaviour at different ambienttemperatures and battery state of charge. Physical startability tests were planned andperformed on a commercial vehicle at different temperatures inside a climatechamber. The results of these tests show the torque of the vehicle’s powertrainincreasing with lowering temperature while the cranking system’s performancedecreases. This decrease in the cranking system’s performance is a result of thebattery’s lowering ability to supply power at lower temperatures.

  • 21.
    Purger, Ennea
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Nordlund, Victor
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Testautomatisering på en Microsoft-plattform inom banksektorn: En undersökning om hur automatiska integrations- och regressionstester kan implementeras på Handelsbanken2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    For several years, testing has been a way to increase the quality of developed program code. As technology advances, automated testing has emerged as a hot topic in system development and has been proclaimed to streamline the previous manual testing process. The purpose of this bachelor thesis was to study the possibilities of implementing automated testing at a department of Handelsbanken, focusing on integration and regression testing. Based on the prerequisites of the department, a prototype focusing on their Microsoft platform was developed to demonstrate a possible solution. The prototype consisted of a Jenkins server executing tests written in C# with the help of MSTest.exe. The tests used both proprietary and open-source frameworks. Services and files were tested using said frameworks. The prototype proved that automatic testing could be implemented at the department, but maintenance and a clear and comprehensive testing procedure was required.

  • 22.
    Raghothama, Jayanth
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Meijer, Sebastiaan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Rigor in Gaming for Design: Conditions for Transfer Between Game and Reality2018In: Journal Simulation & Gaming, ISSN 1046-8781, E-ISSN 1552-826X, Vol. 49, no 3, p. 246-262Article in journal (Refereed)
    Abstract [en]

    Background. The increasing cognizance of complexity in systems has brought into focus important questions about the methods and tools we use to address them. Games for design, where games and computer simulations are used together to create concrete and tangible designs in a pluralistic way, with multiple stakeholders within the game is a new area for simulation gaming. Aim. In this article about gaming for design, embedded in the design science approach towards game science, we raise important philosophical questions about this new area, as well as attempt to address practical questions at the application level. We attempt to bridge the analytical science and design science approaches to games, and analyze them through meta-constructs of games such as fidelity, abstraction and resolution. Results. Results from two applications, through analysis of game play and debriefing of game sessions from two applications, COMPLEX and ProtoWorld are gathered and analyzed to understand the respresentational requirements for simulations and games. Conclusion. Results point to the need for rigor in gaming, particularly when modeling reference systems and rigor in assessing effects, both during game play and while debriefing. Results also point to expanded definitions of meta-constructs of games, as well as to their linked nature.

  • 23.
    Renström, Martin
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Holmsten, Timothy
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Fraud Detection on Unlabeled Data with Unsupervised Machine Learning2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A common problem in systems handling user interaction was the risk for fraudulent behaviour. As an example, in a system with credit card transactions it could have been a person using a another user's account for purchases, or in a system with advertisment it could be bots clicking on ads. These malicious attacks were often disguised as normal interactions and could be difficult to detect. It was especially challenging when working with datasets that did not contain so called labels, which showed if the data point was fraudulent or not. This meant that there were no data that had previously been classified as fraud, which in turn made it difficult to develop an algorithm that could distinguish between normal and fraudulent behavior. In this thesis, the area of anomaly detection was explored with the intent of detecting fraudulent behavior without labeled data. Three neural network based prototypes were developed in this study. All three prototypes were some sort of variation of autoencoders. The first prototype which served as a baseline was a simple three layer autoencoder, the second prototype was a novel autoencoder which was called stacked autoencoder, the third prototype was a variational autoencoder. The prototypes were then trained and evaluated on two different datasets which both contained non fraudulent and fraudulent data. In this study it was found that the proposed stacked autoencoder architecture achieved better performance scores in recall, accuracy and NPV in the tests that were designed to simulate a real world scenario.

  • 24. Roungas, B.
    et al.
    Meijer, Sebastiaan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Verbraeck, A.
    Knowledge management of games for decision making2018In: 48th conference of the International Simulation and Gaming Association, ISAGA 2017, Springer, 2018, Vol. 10825, p. 24-33Conference paper (Refereed)
    Abstract [en]

    Games for decision making have developed into a powerful tool for corporations. Irrespective of their size, corporations have been increasingly using these games in order to evaluate and ascertain impactful business decisions and strategies. Despite their proven added value to the decision making process, there is still lack of research on whether, and if so how, these games can be used by researchers and practitioners to build evidents on systems’ behavior, as part of a larger scheme. To this effect, this paper proposes a framework to determine the different artifacts of games that should be logged and stored for future use.

  • 25.
    Saviaro, Markus
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Analys av designparametrar för trådlösa bärbara Bluetooth-högtalare2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report investigates which components a portable wireless Bluetooth speakerconsists of and the design parameters a prospective designer should take into consideration.The characteristics of six commercially available speaker models andthe design solutions used in these were examined. The design parameters wereanalyzed to investigate if and how these could be improved upon. Simulations ofspeaker prototypes were done and prototypes of speakers and an amplifier werebuilt. Measurements were made to be able to compare and verify the audio performanceof the prototypes. Moreover, measurements of music were made to investigatehow the RMS-value of music impacts the power of an amplifier in general andin active systems in particular. Design recommendations on how to build a Bluetoothspeaker are given in the end of the report together with suggestions on alternatetechnologies to look into for implementation in future Bluetooth speakers.

  • 26.
    Strand, Henrik
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Automatiserad matchning vid rekrytering2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    It can be hard for a small company with no dedicated HR-role to find suiting recruits. A lack of resources takes a toll on the existing employees and increase stress that further harms recruiting. The goal of this work was to find a solution to automate matching in a recruitment process by suggesting relevant applicants that have previously used Cheffle.

    There are multiple ways of matching data. In the case of this study, machine learning was used. A prototype was developed. It collected data about a job and its related applicants. The data was then used by the machine learning models Support vector machine and Artificial Neural Network to classify the applicants by how closely they match the job position.

    The conclusion made in this work is that no model had a precision high enough in its classification to be used in a final implementation. The low precision in classification is likely a result of the small amount of test data available. The result showed that the machine learning models Support vector machine and Artificial Neural Network had potential in this type of matching. To firmly determine this the models would need to be tested with more test data.

  • 27.
    Strandberg, Leo
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Mirovic, Zivojin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Hållbar kraftförsörjning av signalanläggningar: En undersökning av Roslagsbanans signalsäkerhetsutrustning2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Roslagsbanan's signal systems have several different solutions for its power supply in the form of several standards for batteries and rectifiers. This solution variation has made it difficult for maintenance staff to correct the errors that occurred and thus delayed traffic, i.e. traffic disturbances.

    Roslagsbanan is partly supplied by local power grids where interruptions occur occasionally. These interruptions often occur when the network service providers maintain their home network, which may also occur during rush hour traffic. The interruptions can also be caused by the signal systems them self when large voltage variations occur, e.g. when large inductive or capacitive loads are switched off. These problems are analysed, and action proposals are presented in this report. The existing rectifiers and batteries as well as proposals for replacement products that are needed for this safety system have been compiled in this report.

    To create a sustainable, robust and environmentally friendly power supply to Roslagsbanan’s signal systems, this work investigated transients, uninterruptible power supply, as well as the possibility of connecting solar cells as a complementary arrangement. An investigation of the signal equipment at Roslags Näsby station area showed presence of transients. Two proposals to reduce these transients were presented. The proposals were a low pass filter and a metal oxide varistor, both individually reduces transients. The low pass filter attenuates the voltage and current of the signal when the strong frequency changes occurs and the metal oxide varistor reduces the current flow at overvoltages.

    Further investigations of the transients in Roslags Näsbys and the other signal facilities on the Roslagsbanan should be performed. On the other hand, the results of the investigations on uninterruptible power and solar cells showed that the equipment should not be installed in the current signal systems. Solar cells were not implementable because the power requirement of the signal systems was greater than the current ceiling area for the solar cells.

    The work and investment for uninterruptible power supply maintenance and installation were more demanding in comparison to its usefulness for the reliability of the signal systems. Proposals for replacement products were submitted to employers to create a standard for Roslagbanan's power supply onwards.

  • 28.
    Sun, Yan
    et al.
    Shandong Univ Finance & Econ, Sch Management Sci & Engn, 7366 Second Ring East Rd, Jinan 250014, Shandong, Peoples R China..
    Hrusovsky, Martin
    WU Vienna Univ Econ & Business, Inst Prod Management, Welthandelspl 1, A-1020 Vienna, Austria..
    Zhang, Chen
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Lang, Maoxiang
    Beijing Jiaotong Univ, Sch Traff & Transportat, Beijing 100044, Peoples R China..
    A Time-Dependent Fuzzy Programming Approach for the Green Multimodal Routing Problem with Rail Service Capacity Uncertainty and Road Traffic Congestion2018In: Complexity, ISSN 1076-2787, E-ISSN 1099-0526, article id 8645793Article in journal (Refereed)
    Abstract [en]

    This study explores an operational-level container routing problem in the road-rail multimodal service network. In response to the demand for an environmentally friendly transportation, we extend the problem into a green version by using both emission charging method and bi-objective optimization to optimize the CO2 emissions in the routing. Two uncertain factors, including capacity uncertainty of rail services and travel time uncertainty of road services, are formulated in order to improve the reliability of the routes. By using the triangular fuzzy numbers and time-dependent travel time to separately model the capacity uncertainty and travel time uncertainty, we establish a fuzzy chance-constrained mixed integer nonlinear programming model. A linearization-based exact solution strategy is designed, so that the problem can be effectively solved by any exact solution algorithm on any mathematical programming software. An empirical case is presented to demonstrate the feasibility of the proposed methods. In the case discussion, sensitivity analysis and bi-objective optimization analysis are used to find that the bi-objective optimization method is more effective than the emission charging method in lowering the CO2 emissions for the given case. Then, we combine sensitivity analysis and fuzzy simulation to identify the best confidence value in the fuzzy chance constraint. All the discussion will help decision makers to better organize the green multimodal transportation.

  • 29.
    Sun, Yan
    et al.
    School of Management Science and Engineering, Shandong University of Finance and Economics.
    Zhang, Chen
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Dong, Kunxiang
    School of Management Science and Engineering, Shandong University of Finance and Economics.
    Lang, Maoxiang
    School of Traffic and Transportation Beijing Jiaotong University.
    Multiagent Modelling and Simulation of a Physical Internet Enabled Rail-Road Intermodal Transport System2018In: Urban Rail Transit, ISSN 2199-6687, Vol. 4, p. 1-14Article in journal (Refereed)
    Abstract [en]

    Simulation-based analysis has been used for planning, control, and decision-making support of physical internet enabled logistics networks. However, multiagent modelling and simulation based on micro-level interactions have been rarely developed for the pre-studies of digital transformation of urban rail transit systems. This hinders a wider industrial deployment of agent technology in the physical internet enabled transport infrastructure. To fill in this knowledge gap, this work presents an agent-based simulation that explicitly models the micro-level protocols of mobile recourse units and their interaction with the physical infrastructure in a rail-road intermodal transport network. Parameterisation of the simulation model is changeable to examine the influences of different efficiency factors. This allows understanding of which structural functions and resource configuration would make an impact system-wide. Through a practical application, a multiagent system is developed for modelling and analysis of sustainable logistics with individually operated mobile resource units. An agent-based simulation assessment is performed to quantify the improvement options. The results reveal that the physical internet can prevent trucks from empty driving, which has a positive effect on the sustainable logistics operations. The proposed model can be used to support the deployment and planning of digital transformation that could be implemented in urban rail transit systems serving urban distribution and passenger transport.

  • 30.
    Wåhslén, Jonas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Technical Solutions for Internet-based Wireless Sensor Networks in e-Health Applications2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    E-Health technology has developed rapidly in the last decade. Body-worn sen- sors have developed from an idea to a reality. Today, wireless sensors can perform functions from measuring heartbeats to advanced motion recognition. However, the integration of the various available solutions is still lacking. The research presented in this thesis examined important issues in wireless sensor networks and mobile phone systems for e-Health applications. The dissertation covers four essential areas for successful integration of IoT communication systems for e-Health. The first area is fusion of sensor data. In the previous licentiate thesis (2013), three algo- rithms were developed to synchronise data from multiple wireless sensors. The dissertation presents a method to merge data from wireless sensors with video streams. That was subsequently applied for automatic fall prevention and fall detec- tion using inertial sensors and a depth camera. The second area is mobile phone centric systems for Wi-Fi device-to-device sensor communication enabling mobility in ambient assisted living (AAL) services. The third area is a real-time monitoring and control system for Bluetooth wireless communication networks. Lastly, the dissertation presents a software framework to iteratively develop, tune and deploy functions in wireless sensor network using dynamic software updating.

  • 31.
    Wåhslén, Jonas
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Lindh, Thomas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    A Javascript Web Framework for Rapid Development of Applications in IoT System for eHealthManuscript (preprint) (Other academic)
    Abstract [en]

    Bluetooth Low Energy (BLE) is currently the dom- inating wireless network solution for eHealth and sports. Howev- er, most BLE sensors require dedicated applications with limited development capabilities. This paper presents a method for rapid development of applications in distributed BLE IoT systems for eHealth and sports. The method is implemented as a JavaScript web framework based on HTML5 canvas, WebSocket and Web Bluetooth APIs. This paper demonstrates how the framework can be applied to develop an application for monitoring physical activity and heart rate. The framework enables software and service operators to iteratively create, tune and deploy filter algorithms in distributed BLE IoT systems, without rebooting nodes or restarting programs using dynamic software updating.

  • 32.
    Zhang, Chen
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Grandits, Thomas
    KTH, School of Technology and Health (STH).
    Härenstam, Karin
    Karolinska Institutet.
    Hauge, Jannicke
    KTH, School of Industrial Engineering and Management (ITM).
    Meijer, Sebastiaan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    A systematic literature review of simulation models for non-technical skill training in healthcare logistics2018In: Advances in Simulation, ISSN 2059-0628, p. 1-15Article in journal (Refereed)
    Abstract [en]

    Resource allocation in patient care relies heavily on individual judgements of healthcare professionals. Such professionals perform coordinating functions by managing the timing and execution of a multitude of care processes for multiple patients. Based on advances in simulation, new technologies that could be used for establishing realistic representations have been developed. These simulations can be used to facilitate understanding of various situations, coordination training and education in logistics, decision-making processes, and design aspects of the healthcare system. However, no study in the literature has synthesized the types of simulations models available for non-technical skills training and coordination of care. A systematic literature review, following the PRISMA guidelines, was performed to identify simulation models that could be used for training individuals in operative logistical coordination that occurs on a daily basis. This article reviewed papers of simulation in healthcare logistics presented in the Web of Science Core Collections, ACM digital library, and JSTOR databases. We conducted a screening process to gather relevant papers as the knowledge foundation of our literature study. The screening process involved a query-based identification of papers and an assessment of relevance and quality. Two hundred ninety-four papers met the inclusion criteria. The review showed that different types of simulation models can be used for constructing scenarios for addressing different types of problems, primarily for training and education sessions. The papers identified were classified according to their utilized paradigm and focus areas. (1) Discrete-event simulation in single-category and single-unit scenarios formed the most dominant approach to developing healthcare simulations and dominated all other categories by a large margin. (2) As we approached a systems perspective (cross-departmental and cross-institutional), discrete-event simulation became less popular and is complemented by system dynamics or hybrid modeling. (3) Agent-based simulations and participatory simulations have increased in absolute terms, but the share of these modeling techniques among all simulations in this field remains low. An extensive study analyzing the literature on simulation in healthcare logistics indicates a growth in the number of examples demonstrating how simulation can be used in healthcare settings. Results show that the majority of studies create situations in which non-technical skills of managers, coordinators, and decision makers can be trained. However, more system-level and complex system-based approaches are limited and use methods other than discrete-event simulation.

  • 33.
    Zhang, Xianjie
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Bogic, Sebastian
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Datautvinning av klickdata: Kombination av klustring och klassifikation2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Owners of websites and applications usually profits through users that clicks on their links. These can be advertisements or items for sale amongst others. There are many studies about data analysis where they tell you if a link will be clicked, but only a few that focus on what needs to be adjusted to get the link clicked. The problem that Flygresor.se have is that they are missing a tool for their customers, travel agencies, that analyses their tickets and after that adjusts the attributes of those trips. The requested solution was an application which gave suggestions about how to change the tickets in a way that would make it more clicked and in that way, make more sales. A prototype was constructed which make use of two different data mining methods, clustering with the algorithm DBSCAN and classification with the algorithm knearest neighbor. These algorithms were used together with an evaluation process, called DNNA, which analyzes the result from the algorithms and gave suggestions about changes that could be done to the attributes of the links. The combination of the algorithms and DNNA was tested and evaluated as the solution to the problem. The program was able to predict what attributes of the tickets needed to be adjusted to get the tickets more clicks. ‘The recommendations of adjustments were reasonable but this result could not be compared to similar tools since they had not been published.

  • 34.
    Zhengyu, Wang
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Al-Shorji, Yousuf
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Fisheye live streaming: A study of the dewarping function and the performance of the streaming2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Provision of live streaming of video from fisheye camera is a popular business in the IT sector. Video dewarping is one of its special fields that expands rapidly. As the requirement of video quality becomes higher and higher, there is an increasing need for efficient solutions that can be utilized to process videos in attempts to gain desirable results. The problem is to determine the right combination of transmission bitrate and resolution for live streaming of the dewarped videos.

    The purpose of this thesis is to develop a prototype solution for dewarping video from fisheye camera and re-stream it to a client. This prototype is used for testing combinations of bitrate and resolution of the video in different scenarios.

    A system is devised to live stream a video from a fisheye camera, dewarp the video in a server and display the video in media players. The results reveal that the combination of bitrate 3.5 - 4.5 Mbps and resolution 720p is best suited for transmission to avoid noticeable lagging in playback. Comments of observers prove the promising use of the dewarped videos as Virtual Reality(VR) technology. 

1 - 34 of 34
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