Change search
Refine search result
123 1 - 50 of 109
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 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.
    Abraham, Johannes
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Romano, Robin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Automatisk kvalitetssäkring av information för järnvägsanläggningar: Automatic quality assurance of information for railway infrastructure2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With increased expectations for the expansion of the future railway, this entails an increased load on the current railway network. The result of the expansion can be an increasing number of cancellations and delays. By taking advantage of technological innovations such as digitalization and automation, the existing system and work  processes can be developed for more efficient management.   The Swedish Transport Administration sets requirements for Building Information Modeling (BIM) in procurements. The planning of signal installations within the railway takes place in Sweco using the CAD program Promis.e. From the program, lists containing the information of the objects (BIS-lists) can be retrieved. The  Swedish Transport Administration requires that the attributes must consist of a  certain format or have specific values. In this thesis project, methods for automatic quality assurance of infrastructure information and the implementation of the method for rail projects were examined. The investigated methods include the  calculation program Excel, the query programming language SQL and the process of ETL.  After analyzing the methods, the ETL process was chosen. The result was that a  program was created to automatically select the type of BIS list that would be  reviewed and to verify that the examined attributes contained allowed values. In  order to investigate whether the cost of the programs would benefit the company in addition to the quality assurance, an economic analysis was carried out. According to the calculations, the choice of method could also be justified from an economic  perspective.

  • 3.
    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.

  • 4.
    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.

  • 5.
    Aldahan, Leith
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Kudoori, Ivan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Utvärdering av roterande borstlösfrekvensomformare tillspårledningar2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Track lines are used in subway stations to show the train locations and determine the speed of the train by chopping the frequency. The frequency of the track lines is obtained from a rotary frequency converter. In today's stations, rotary frequency converters with brushes are commonly used. These emit a great deal of heat in some relays and produce environmental problems in the form of carbon dust from the brushes. The existing systems have been used for over 30 years and obtaining spare parts and conducting maintenance on the systems can be difficult.

    This degree project examines the possibility of newer systems being built on a rotating brushless frequency converter, where the spare parts and servicing would be available for at least the next 25 years.

    The project surveys and compares different rotating brushless frequency converters from different suppliers to find an identical frequency converter to meet the requirements of the Traffic Administration.

    The result of this study has had a lot of focus on the problem area with the brushed frequency converter that produces harmful substances such as carbon dust and the heat in the relay room. Discussions with manufacturing companies of rotating brushless frequency converters have been made during this study where possible options were discussed for further development of the system in relay rooms. The result has also discussed the possibilities of using the new system of frequency converters with brushless motor and generator instead of the current brushed frequency converter available in the facility. The result has also shown that the rotating brushless frequency converter can convert the frequency to 75 Hz. The new system meets RAMS requirements of the Trafikförvaltning, and the system lasts for at least 25 years. This was a major requirement of the Trafikförvaltning, which was fulfilled during this study.

  • 6.
    Alfrijat, Christopher
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Eriksson, Rasmus
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Analys och utvärdering av LED-belysning i Stockholms tunnelbana2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Trafikförvaltningen, responsible for public transport in Stockholm, has started a project to replace existing luminaires in the subway of Stockholm to LED lights. This thesis could be a basis for an upcoming procurement.

    In this report, various models of LED lights technical specifications will be evaluated based on the environmental requirements in Stockholm’s subway, where the existing luminaires will be replaced. For this environment, there is no standard regarding LED lights today. With the help of literature studies and tests, a groundwork for a specification could be made. The tests were only made on a selection of LED lights and their technical specifications were presented. All luminaires passed the EMC (electromagnetic compatibility) tests that were made in order to determine any interference with Stockholm’s public transport (SL) radio communication system.

    Environmental aspects and economical aspects of the implementation of LED lights has been taken into consideration.

  • 7.
    Andersson, Julius
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Engström, David
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    A study in how to inject steganographic data into videos in a sturdy and non-intrusive manner2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    It is desirable for companies to be able to hide data inside videos to be able to find the source of any unauthorised sharing of a video. The hidden data (the payload) should damage the original data (the cover) by an as small amount as possible while also making it hard to remove the payload without also severely damaging the cover. It was determined that the most appropriate place to hide data in a video was in the visual information, so the cover is an image. Two injection methods were developed and three methods for attacking the payload. One injection method changes the pixel values of an image directly to hide the payload and the other transforms the image to cosine waves that represented the image and it then changes those cosine waves to hide the payload. Attacks were developed to test how hard it was to remove the hidden data. The methods for attacking the payload where to add and remove a random value to each pixel, to set all bits of a certain importance to 1 or to compress the image with JPEG. The result of the study was that the method that changed the image directly was significantly faster than the method that transformed the image and it had a capacity for a larger payload. The injection methods protected the payload differently well against the various attacks so which method that was the best in that regard depends on the type of attack.

  • 8.
    Berezkin, Nikita
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Heidari, Ahmed
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Berika receptdata med innehållshanteringssystem2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The problem today is that people do not eat climate-smart food; this results in that the food will not suffice, and what we eat may harm the greenhouse effect. The problem is that people do not have the time or knowledge to cook climate-smart food. A solution is to use a Content Management System (CMS). A Content Management System processes selected type of data in a specific way which is then stored. This report will address the basics and the making of a CMS in a recommendation system for a user. The system will entail a more climate-smart food alternative to achieve the individual's personal needs. The result was that with the help of data from various sources, an ingredient of a recipe could add additional information such as nutritional value, allergies, and whether it is vegetarian. Tests such as performance tests on the execution time for the CMS, parsing accuracy, and matching product accuracy, a better result was achieved. Most of the ingredients in the recipe became enriched, which leads to more climate-smart food alternatives, which are better for the environment. The accuracy is the matching of ingredients in the recipe to the names of products in the business. The next step was to enrich the recipes using enriched ingredients.

  • 9.
    Berglund, Johan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Analys av olika positioneringssystem för Trafikförvaltningens järnvägsbanor2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Positioning systems have a vital role in securing safe movement of trains. There are many differenttypes of positioning systems. This thesis is about how axle counters, communications-based traincontrol (CBTC) and different kinds of track circuits operate. It also contains an analysis of AC-trackcircuits and axle counters with RAMS-parameters (Reliability, Availability, Maintenance and Safety)as guide points to make a conclusion of what type of system that best suits for Stockholm PublicTransports railway tracks. Through interviews with experienced persons within the railway industryin Stockholm knowledge of pros and cons of different systems was obtained. A fault tree analyses(FTA) was made for axle counters and track circuits to visualize potentially hazardous situations.Failure statistics were produced to show failure frequency for one track with axle counters and onetrack with track circuits. A clear result was not shown but it can be concluded that sources of failurethat are prone to track circuit systems can be avoided using axle counters. What became evident isthat the management need to standardize to a fewer amount of different positioning systems. Itwould make it easier to find available personnel with the required skills for doing maintenance. Thiswould also have a benefit when securing maintenance supplies.

  • 10.
    Bergström, Aileen
    et al.
    Karolinska Inst, Dept Neurobiol Care Sci & Soc, Div Occupat Therapy, Stockholm, Sweden..
    Borell, Lena
    Karolinska Inst, Dept Neurobiol Care Sci & Soc, Div Occupat Therapy, Stockholm, Sweden..
    Meijer, Sebastiaan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Guidetti, Susanne
    Karolinska Inst, Dept Neurobiol Care Sci & Soc, Div Occupat Therapy, Stockholm, Sweden..
    Evaluation of an intervention addressing a reablement programme for older, community-dwelling persons in Sweden (ASSIST 1.0): a protocol for a feasibility study2019In: BMJ Open, ISSN 2044-6055, E-ISSN 2044-6055, Vol. 9, no 7, article id e025870Article in journal (Refereed)
    Abstract [en]

    Introduction Older persons with functional limitations often need assistance from home care staff to thrive and continue to live in their home environments. Reablement, a proactive, preventative approach administered by home care staff, stimulating active engagement of the older person, is often recommended. Even though reablement has a potential to become a new rehabilitation model and has been implemented in different countries in various degrees, there is a lack of knowledge regarding the process of establishing reablement, the theoretical underpinnings and the conditionality and outcomes in different contexts. This knowledge is needed before fullscale recommendations can be made for implementation in specific contexts. Aim This study protocol aims to present a feasibility study of the intervention, ASSIST 1.0, a theory-based reablement programme, which includes coaching of home care staff and digitally based smart products, in a Swedish context. Methods and analysis This feasibility study will evaluate the perceived value and acceptability of ASSIST 1.0 intervention programme regarding fidelity, reach and dose, and potential outcomes by using a pretest and post-test design involving an intervention group and a control group (n=30) of older persons living at home, needing home care services. Qualitative interviews with home care staff delivering ASSIST and the older adults receiving the intervention as well as their significant others will be conducted to explore aspects affecting the intervention. Ethics and dissemination This study has been approved by the regional ethics board. The results of the feasibility study will form the base for refinement of the ASSIST programme and for the subsequent planning of a full-scale randomised controlled trial investigating the effect of the programme on a larger scale. Dissemination will include peer-reviewed publications and presentations at national and international conferences as well as information to involved stakeholders.

  • 11.
    Björck, Linnea
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Petersen, Johan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Höjdmätare för fallskärmshoppning: Metoder för höjdmätning samt framtagning av algoritmer för vald metod2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In skydiving, in addition to a well-functioning parachute system, a good and precise altimeter is needed. Both which are crucial parts of equipment in order to be able to perform a safe jump. Through digitalization and the technological development, there are today interests of developing a digital altimeter with better precision and several functions There are a number of techniques for measuring altitude. Those that are included in this bachelor thesis are GPS, radar and barometers.

    The aim of the thesis was to develop a robust algorithm for measuring height, with the possibility of development. The thesis work would also include risk analysis of selected technology or techniques, as well as suggestions for suitable presentation techniques and system solutions in a larger perspective. The system solutions would be adapted for easy integration of new features. If time allowed it, a prototype would also be developed and tested.

    The method chosen was a digital altimeter because it was best suited for the goals set for the project. To calculate the height with the digital altimeter, the relationship between air pressure and height was used. The result of these calculations showed a sufficiently precise measurement value to be acceptable. Since the accuracy of the measurement value was acceptable, it was decided that no further corrections would be made. The work continued with developing a prototype and testing it. The result was a functioning prototype. Future development opportunities are available within presentation technology, chassis, further corrections of the formula for height measurement and more iterations of hardware.

  • 12.
    Brodin Kont, August
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics. KTH.
    Positioning and parking analysis for an indoor positioning system: A comparative study between Bluetooth Low Energy and Ultra Wideband technology2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The work done in this report as requested by H&D Wireless is performed by using an already developed real time positioning system called Griffin Enterprise Positioning Service and integratingit with ultrasound sensors for presence detection in order to enable assets to park in a visualized environment being actualized by tagging the asset with radio technology hardware. The testing environment was deployed with radio technology hardware equipped for transmitting and receiving radio signals for position estimation of tagged objects where hardware tags emits radio signals being received by sensing radio technology chips called sensepoints which also serves as communication links for further data processing.The thesis focus is on evaluating how different radio technologies combined with different positioning techniques perform in terms of accuracy and precision in positioning tests to assess eachones positioning performance characteristic and the technologies upsides and downsides.This was firstly evaluated by comparing three different technology positioning techniques based on one for Bluetooth Low Energy and two using Ultra Wideband technology being subject to generic tests including a static, dynamic and a walking positioning test for each technology.These initial tests were utilized as a foreground to evaluate which of the two positioning techniques based on Ultra Wideband technology that would compete in the parking tests alongside Bluetooth Low Energy that would serve as the primary objective to accomplish in the thesis.A final implication on parking tags between the two technologies is that Bluetooth Low Energy had to be implemented with higher requirement restrictions for parking due to insufficient relative accuracy and precision in parking positioning which also limited its ability to be parked in alternative manners explored but with power efficiency as a highly valuable aspect for consideration of this technology. Parking tag using Ultra Wideband technology proved highly successful as it saw large distance margins to be allowed parking in all test cases as well as exhibiting sufficient positioning performance to be considered for alternative parking methods without risk of exposure for failed attempts of parking.

  • 13.
    Bylerius, Patrik
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Positionering av tågvagn med hjälp av ett Kalmanfilter2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Positioning of railcars is an important part of the railway industry. In Sweden there are 1000 of trains on the railway which leads to a security risk if a railcar is lost.

    This project examined if it were possible to position a railcar in real time using Kalman filter on a raspberry pi with the variable’s latitude and longitude. The project also examined if the Kalman filter could replace an GPS were there was no coverage in that area.

    A prototype was produced and evaluated with a Kalman filter programmed and implemented on it together with a GPS-module. Simulations of several values was made to secure the values that the algorithm did show.

    The prototype shows that the method in this project is within the error margin that the railway demands for a safe system. The results show a deviation of the position that was sought after with the Kalman filter. The coordinates for latitude had a difference of 0,9 m compared to the Kalman filter that was programmed. Longitude also had a difference but with 0,001 m compared to the values that the GPS-module generated.

  • 14.
    Chahine, Sandy
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Chowdhury, Selma
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    RTOS med 1.5K RAM?2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Internet of Things (IoT) is becoming more common in today's society. More and more everyday devices are connected to the wireless network. This requires costeffective computing power, which means that it can be beneficial to investigate the microcontroller and how they would cope with this task. These can be seen as smaller compact computers which despite their size offer a lot of performance. This study aims to inform if any existing operating system can work together with the microcontroller PIC18F452 and how many processes that can run in parallel given the MCU's limited memory. A survey and an experiment were conducted to answer these questions.

    Different choice of methods was investigated and discussed to determine which method would generate the best results. A survey and an experiment were conducted to answer these questions. The experiments required a special development environment to be installed and the generic FreeRTOS distribution was ported to both the correct processor and the experimental card. The porting succeeded and experiments showed that the research question could be answered with a yes. You can run a real-time operating system on an MCU with only 1,5 kB RAM memory.

    During the work, the project also found that Amazon built its IoT on FreeRTOS. However, they had invested in a more powerful MCU. The effort would thus emphasize it as a more future-proof approach.

  • 15.
    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.

  • 16.
    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.

  • 17.
    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.

  • 18.
    Esmaeilie, Ali
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Utvärdering av statiska frekvensomformare till spårledningar för Stockholm tunnelbana2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The subway is a very important means of transport in Stockholm and is in operation

    most of the day. The Red and Blue lines of the metro use an older signal system from

    the 60s. The system used for the signaling of the two lines is of the type AC power

    line with coding and uses relay switches.

    The track circuit that detects the position of different trains on the track use the frequency

    75 Hz. When converting the frequency 50 Hz to 75 Hz, carbon dust and heat

    losses is released to the space from the frequency converter. The carbon dust emitted

    into the air risks affecting relay functionality as it enters the relay housing and settles

    on the surface of the relay contacts in the space next to the frequency converter.

    The Traffic Administration have plans to upgrade the Red Line's signaling system in

    order to use the existing signaling system for another 25 years. The track circuit system

    positions and gives speed messages to the trains. A literature study has been

    conducted on the construction of the track circuit system and previous research has

    been conducted on frequency inverters to safely find a new frequency inverter that

    does not risk relay functionality. Through fact-finding from the Traffic Administration,

    new suitable frequency converters that could be replaced with the existing ones

    were investigated in this research.

    Static frequency converters were chosen to be investigated. According to the requirements

    of the Traffic Administration, four products were identified from different

    suppliers. None of the static frequency converters was directly compatible with existing

    systems because the system was built for a rotary frequency converter. "HZ-

    50-1105" from GoHz this model is available in 1-phase input and 1-phase output respectively.

    "FR-D 700" from Mitsubishi and "Micromaster 440" from Siemens which

    were equal in and out connection. "ACS-150" from ABB this model had a maximum

    rated power up to 4 kVA, which is only suitable for frequency inverters with a rated

    power of 2.5 kVA. The various types of static frequency inverters loaded the network

    in an asymmetrical way. Therefore, it was important to be able to distribute the load

    as evenly as possible on each phase. It was difficult to be able to rank the selected

    products without just showing the choices that existed when replacing rotary frequency

    converters. However, the use of static frequency inverters eliminates the

    risks of a rotating frequency converter. Static frequency converters can more accurately

    generate different frequencies and they have a shorter commissioning time;

    however, they load the network asymmetrically compared to rotating frequency converters.

  • 19.
    feisal, haadi
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    altangerel, ulsbold
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Multi-sided payment platform using Blockchain and Open banking2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There are various large competitors, dominating the digital payment market. These competitors acquire most of the customers, maintaining their dominant influence in the market by charging customers and merchant’s fees for mobile payments. The purpose of this study is to investigate and develop a payment system that connects various payment applications and bank services. This system is developed with the help of blockchain and open banking technology. The blockchain system is utilized as a secure universal database, while the open banking technology is used for transactions. This study proposes an architecture for a multi-sided payment platform. The architecture follows the microservice design pattern which allows the components of the system to be individually developed and maintained. A prototype system was developed as a proof of concept for the architecture, proving the possibility of a multisided payment platform. The “ICA Handla” payment application and Nordea (open banking) system were used to connect to the prototype through gateway programs. The purpose of gateway programs is to connect a mobile payment application or a bank service with the blockchain system. The multi-sided payment application creates opportunities in the digital payment market.

    The full text will be freely available from 2020-06-08 10:00
  • 20.
    Fernandes Pereira, Sonia
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Hamid, Nejat
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Closed-Loop Orchestration Solution2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Computer networks are continuously evolving and growing in size and complexity. New technologies are being introduced which further increases the complexity. Net- work Service Orchestration is all about pushing configuration out into the network devices automatically without human intervention. There can be issues that causes the orchestration to fail. In many cases manual operations must be done to recover from the error which is very contradicting since the goal of orchestration is that it should be fully automated.

    There is some indication that the errors that are being solved manually could be de- tected and handled by a feedback mechanism. This thesis work aimed to build on current insight and if possible, verify that the feedback mechanism is a viable method.

    After consideration on different ways to solve the research question, the choice fell on creating a test environment where the approach was tested. The test environment was used to investigate if a network orchestration system could be integrated with a feedback mechanism. The result of this project presents a way to automatically de- tect a network failure and send feedback to a Network Service Orchestrator. The or- chestrator is then able to identify and correct the error.

  • 21.
    Fragapane, Giuseppe
    et al.
    Norwegian University of Science and Technology.
    Zhang, Cevin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Sgarbossa, Fabio
    Norwegian University of Science and Technology.
    Strandhagen, Jan Ola
    Norwegian University of Science and Technology.
    An Agent-Based Simulation Approach To Model Hospital Logistics2019In: International Journal of Simulation Modelling, ISSN 1726-4529, E-ISSN 1996-8566, Vol. 18, no 4, p. 654-665Article in journal (Refereed)
  • 22.
    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.

  • 23.
    Gernandt, Niclas
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Farhod, Jaser
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    JÄMFÖRELSE AV ATTITYDANALYS ALGORITMER FÖR SPELOMDÖMEN2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today there exist a huge amount of user created content in the shape of text from game reviews to opinions in microblogs like Twitter. To analyze this data could be of value for both companies and data scientists but remains to be very daunting. With the help of sentiment analysis this could be achieved automatically and save resources, but the question remains which algorithms have the best performance? With the help of a study and a couple of tests the most popular approaches in sentiment analysis could be compared by analyzing game reviews from the platform Steam. Through testing it has showed that machine learning based algorithms have the best performance and are easier to start with in comparison to lexicon-based approaches, which barely even reach the threshold for reliability in classifying reviews to be positive or negative. But it’s still important to plan and consider which algorithm one chooses for sentiment analysis as both approaches have their flaws and had a weak performance regarding sarcastic reviews.

  • 24.
    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).

  • 25.
    Gitijah, Parham
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Utveckling av mätmetod och prestandaanalys av LoRa2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The Internet of Things (IoT) use cases have increased significantly in recent years. Therefore, new wireless communication technologies are needed that meet the criteria such as low power consumption, long range and low cost. LoRa, which stands for "Long Range", is a wireless communication technology developed by the LoRa Alliance to meet these criteria. 

    The purpose of this paper is to a develop measurement method for performance analysis of the LoRa radio system. The measurement method used to analyze how different parameters such as data rate, distance and different environments affect LoRa network performance parameters i.e. signal strength, packet loss, latency and jitter.

    To achieve the purpose, a measurement method and prototype were first developed. Then experiments were carried out in two different environments (urban and open space). In each experiment, an IoT node was positioned at different distances and data packets were sent from the IoT node to a gateway with different data rates. The data rate was changed by changing the spreading factor (SF) and bandwidth. Passive measurement method was used to collect measurement data. The method used to analyze the results was the statistical data analysis method since the data collected was quantitative.

    The result shows that the signal strength is affected by the environment, distance and bandwidth. The signal strength is stronger in free view compared to urban environment. The signal strength is stronger even at shorter distances and greater bandwidth. However, the data rate (SF) has minimal impact on signal strength. The fact that the signal strength is affected by the bandwidth is interesting results that could not be predicted before.

    The packet loss is affected by the environment, data rate and distance. More data packets go lost at longer distances and in the urban environment. Lower data rate cause to fewer data packets go lost and a longer communication range being achieved. According to earlier work's simulations, it was possible to predict that higher data rates lead to longer communication range, but in this study experiments were carried out on real hardware to investigate the results.

    Environment, distance and data rate affect the delay. The delay is a few milliseconds longer in urban environment than the free space environment at the same distance. The delay is also a few milliseconds longer at longer distances in the same environment. However, data rate has the greatest impact on the delay. The delay changes by a few hundred milliseconds when the data rate is changed by SF and/or bandwidth.

    The jitter is not affected by the environment and distance. Data rate (bandwidth and SF) affects the delay variation but this influence is low and can be ignored.

  • 26.
    Gustafsson, Robin
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Fröjdendahl, Lucas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Machine Learning for Traffic Control of Unmanned Mining Machines: Using the Q-learning and SARSA algorithms2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Manual configuration of rules for unmanned mining machine traffic control can be time-consuming and therefore expensive. This paper presents a Machine Learning approach for automatic configuration of rules for traffic control in mines with autonomous mining machines by using Q-learning and SARSA. The results show that automation might be able to cut the time taken to configure traffic rules from 1-2 weeks to a maximum of approximately 6 hours which would decrease the cost of deployment. Tests show that in the worst case the developed solution is able to run continuously for 24 hours 82% of the time compared to the 100% accuracy of the manual configuration. The conclusion is that machine learning can plausibly be used for the automatic configuration of traffic rules. Further work in increasing the accuracy to 100% is needed for it to replace manual configuration. It remains to be examined whether the conclusion retains pertinence in more complex environments with larger layouts and more machines.

  • 27.
    Gustavsson, Vilhelm
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Machine Learning for a Network-based Intrusion Detection System: An application using Zeek and the CICIDS2017 dataset2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Cyber security is an emerging field in the IT-sector. As more devices are connected to the internet, the attack surface for hackers is steadily increasing. Network-based Intrusion Detection Systems (NIDS) can be used to detect malicious traffic in networks and Machine Learning is an up and coming approach for improving the detection rate. In this thesis the NIDS Zeek is used to extract features based on time and data size from network traffic. The features are then analyzed with Machine Learning in Scikit-Learn in order to detect malicious traffic. A 98.58% Bayesian detection rate was achieved for the CICIDS2017 which is about the same level as the results from previous works on CICIDS2017 (without Zeek). The best performing algorithms were K-Nearest Neighbors, Random Forest and Decision Tree.

  • 28.
    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.

  • 29.
    Hassan, Yusuf
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Migration of Signing Algorithms: An investigation in migration of signing algorithms used in certificate authorities.2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The migration of signing algorithms is a process which can be used to move from signing algorithms which are regarded as less safe to algorithms which are regarded as safer. The safety of cryptographic algorithms has been compromised before, algorithms such as SHA-1 has been proven to be broken. The goal of this study was to find criteria that could define a successful migration as well as evaluating a method to perform a migration.

    The criteria were found by evaluating related works found in an RFC document as well as in a Springer conference paper. The criteria that was found was the following: backwards compatibility, no downtime, no need for mass revocation, no need for strict scheduling and no extra overhead. The evaluated method utilized a construct called a multiple key certificate; it was chosen because it conformed to most of the found criteria. The multiple key certificate utilized two different key pairs, one generated from a conventional algorithm and the other using an alternative algorithm, it also conformed to the x.509 standard. The alternative algorithm could be chosen to be a post quantum algorithm. The prototype was tested for time overhead, memory overhead and backward compatibility.

    The results of testing to sign and verify 10 000 certificates as well as examining the file size of the certificate showed that the choice of alternative algorithm heavily affects the time overhead of the prototype certificate. The multiple key certificate also proved to be backwards compatible with widely used applications. This solution has proven itself to act in accordance to all the newly established criterion except for the criterion regarding overhead however, alternative algorithms could be strategically chosen to minimize overhead. The multiple key certificate seems to be a successful way to migrate signing algorithms.

  • 30. Hellström Karlsson, Rebecca
    et al.
    Shreenath, Vinutha Magal
    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.
    Aiding Remote Diagnosis with Text Mining2018In: Proceedings of the 31st International Florida Artificial Intelligence Research Society Conference, FLAIRS 2018, 2018Conference paper (Refereed)
    Abstract [en]

    Along with the increase of digital healthcare providers, theinterest in diagnostic aids for remote diagnosis has increasedas well. As patients write about their symptoms themselves,we have access to a type of data which previously was rarelyrecorded, and which has not been filtered by a healthcareprofessional. Knowledge of similar patients and similarsymptoms is beneficial for doctors to arrive at a diagnosis.Therefore, the remote diagnostic process could be aided bypresenting patient cases together with information aboutsimilar patients and their self-reported symptom descriptions.Apart from online diagnosis, such an aid could bebeneficial in many healthcare settings, such as long-distancevisits and knowledge gain from patient diaries.In this paper, we present the impact of aiding remote diagnosisby presenting clusters of similar symptoms, usingsymptom descriptions collected from a virtual visit applicationby the Swedish telemedicine provider KRY. Symptomdescriptions were represented using the bag-of-words modeland were then clustered using the k-means algorithm. Anexperiment was then conducted with 13 doctors, where patientcases were presented together with the most representativewords of the associated cluster, to measure howtheir work was impacted. Results indicated that it was usefulin more complicated cases, but also that future experimentswill require further instructions on how the information is tobe interpreted.

  • 31.
    Hussain, Asad
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Hjälpmedel för kanotister att synkronisera sina paddelrörelser: Androidapplikation för synkronisering av kanotisters paddeltag2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Synchronisation of paddle stroke is an important aspect within the sports of paddling with multiple paddles in one boat to maximise the velocity. Hans Rosdahl from The Swedish School of Sport and Health Sciences, GIH, therefore provided a task to develop a mobile phone application that offers feedback to the paddlers using the application if their paddle stroke is synchronised with the paddler in front. A pre-study has been carried out to investigate possible sensor alternatives that are available, and an application has been developed for the mobile operative system Android. The application connects to an IMU, Inertial Measurement Unit, sensor that measures inertia to determine the orientation of the sensor node. The application receives sensor data from the IMU from the user paddler’s and the front paddler’s sensor nodes and each sensor determines when a paddle stroke has occurred using its orientation. The data showing a stroke is used to calculate the time difference between these strokes to evaluate if the user is synchronised with the front paddler or not. After this evaluation, the user receives a visual response of their synchronisation level on their screen.

  • 32.
    Jacobsson, Martin
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Rohner, Christian
    Uppsala Univ, Dept Informat Technol, Uppsala, Sweden..
    Link quality estimation for arbitrary packet sizes over wireless links using packet reception events2019In: International Journal of Communication Systems, ISSN 1074-5351, E-ISSN 1099-1131, Vol. 32, no 16, article id e4115Article in journal (Refereed)
    Abstract [en]

    The packet error rate of wireless links is known to increase with the length of packets. Yet, packet length is rarely taken into account in protocols and algorithms estimating the packet error rate. Still, it is an important factor that higher layer protocols need to be aware of. In this article, we systematically measure the relationship between packet length and packet error rate over a wide range of wireless links and technologies. On the basis of our measurements, we propose a simple empirical model that can capture this behavior. Using this model, multiple methods are proposed that can estimate the packet error rate for any packet length by sampling the link. We consider methods based on hello packets with controlled packet lengths as well as data packets, where the transmitted packet lengths cannot be controlled. We investigate the accuracy of the different estimation methods in various situations and show how they are able to predict the delivery ratio for different packet sizes.

  • 33.
    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.

  • 34.
    Karbalaie, Abdolamir
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Emrani, Zahra
    Isfahan Univ Med Sci, Med Image & Signal Proc Res Ctr, Esfahan, Iran..
    Fatemi, Alimohammad
    Isfahan Univ Med Sci, Sch Med, Dept Internal Med, Rheumatol Sect, Esfahan, Iran..
    Etehadtavakol, Mahnaz
    Isfahan Univ Med Sci, Sch Med, Dept Med Phys, Esfahan, Iran..
    Erlandsson, Björn-Erik
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
    Practical issues in assessing nailfold capillaroscopic images: a summary2019In: Clinical Rheumatology, ISSN 0770-3198, E-ISSN 1434-9949, Vol. 38, no 9, p. 2343-2354Article, review/survey (Refereed)
    Abstract [en]

    Nailfold capillaroscopy (NC) is a highly sensitive, safe, and non-invasive technique to assess involvement rate of microvascularity in dermatomyositis and systemic sclerosis. A large number of studies have focused on NC pattern description, classification, and scoring system validation, but minimal information has been published on the accuracy and precision of the measurement. The objective of this review article is to identify different factors affecting the reliability and validity of the assessment in NC. Several factors can affect the reliability of the examination, e.g., physiological artifacts, the nailfold imaging instrument, human factors, and the assessment rules and standards. It is impossible to avoid all artifacts, e.g., skin transparency, physically injured fingers, and skin pigmentation. However, minimization of the impact of some of these artifacts by considering some protocols before the examination and by using specialized tools, training, guidelines, and software can help to reduce errors in the measurement and assessment of NC images. Establishing guidelines and instructions for automatic characterization and measurement based on machine learning techniques also may reduce ambiguities and the assessment time.

  • 35.
    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.

  • 36.
    Kornevs, Maksims
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Assessment of Application of Participatory Methods for Complex Adaptive Systems  in the Public Sector2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The provision of services by the public sector is the result of a complex adaptive system at work, and involves a large number of stakeholders from different institutions and organisations. In the era of rapid change in requirements and expectations from the public sector, the management of change processes asks for the involvement of many stakeholders from different layers and positions.

    Participatory methods provide the ability to involve a wide range of stakeholders, but despite their case-wise documented successes, and well described application in involving citizens in governmental decision-making, very little evidence exists of their role when engaging professionals.

    This study assesses the application of participatory methods as an approach to support change processes in the public sector from a complex adaptive system perspective. The purpose of this two-phase exploratory sequential mixed method study with descriptive parts is to first qualitatively explore which needs for change in the public sector could benefit from participatory methods, and then to apply participatory methods for six experiments to assess how effective such methods are to support change processes of complex adaptive systems in the public sector.

    Four methods have been included: participatory simulation, gamification, Q methodology and participatory model building. Each of the cases has been scored on a set of frameworks. The cases have been obtained from the fields of road networks, transit and healthcare.

    Analysis across the experiment found several trends. Firstly, experiments at the field-level, where expertise and knowledge outside one organisation are required, showed stronger democratisation and focus on mapping out diversity compared to other levels. Similarly, experiments at the sub-system level are more likely to be focused on reaching consensus and using participants for advising. Secondly, a pattern has been found between higher participatory level of a method, a higher degree of power-sharing between the participants, and better results of an assessment.  A correlation was observed between overall assessment and other parameters of applications: communication efficiency, knowledge between causes and effects, and direction from leadership.

    The recognition that the public sector is a complex adaptive system proved to be more present in the service-oriented fields than in the infrastructure fields. Larger-scale issues at the organisation-level or even field-level proved to be more complex than issues at the subsystem level.

    Participatory methods proved to be effective for providing a grip on issues of a complex nature. Particular strengths were the ability to provide for open structures for thinking outside the box, and the use for identification of bottlenecks and constraints in systems. The ability to identify differences in stakeholder perspectives proves valuable, and can be gathered from a wide range of sources in and around a participatory setting.

    However, successful participatory methods need high communication efficiency, use retroactive evaluation and need to be done based on high stakeholder collaboration. These costs can outweigh all benefits if the problem is not complex or preparation has not been appropriately performed. Access to the right people, support from the organisation and motivated participants, as well as the right choice for the level of participation proved crucial for its success.

  • 37.
    Kornevs, Maksims
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Baalsrud Hauge, Jannicke
    KTH, School of Industrial Engineering and Management (ITM). KTH Royal Inst Technol, Sch Ind Engn & Management, Stockholm, Sweden..
    Meijer, Sebastiaan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Gamification of a Procurement Process for Professional Training of Public Servants2019In: INTERNATIONAL JOURNAL OF SERIOUS GAMES, E-ISSN 2384-8766, Vol. 6, no 2, p. 23-37Article in journal (Refereed)
    Abstract [en]

    Implementation and training about changes in a procurement process are complex due to the complexity of the procurement process characterised by the adaptive stakeholder network and continuously changing market rules. Traditional training approaches for procurement split the process into separate steps; however, to be able to assess all training aspects, it is important to have a holistic look at procurement. This work explores how well gamification can address the complexity of the procurement process for training specialists in the road construction sector. A case study is carried out to train new business models for both experienced specialists and new employees. The steps for the development of gamification for training in procurement are shown. A comparison of results from experienced and less experienced participants is presented. The results show the relationships amongst the complexity of the real system, the gamification design and the results of gamification.

  • 38.
    Kornevs, Maksims
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Baalsrud Hauge, Jannicke
    Meijer, Sebastiaan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Gamifying Project Procurement to Incorporate Better Goals of Organizations in the Public Sector: A participatory simulation approach on a Swedish road construction use case2019In: Operations Research PerspectivesArticle in journal (Other academic)
    Abstract [en]

    Governmental institutions need to ensure work of infrastructures, and in most cases, it is done using project procurement process. Such processes have highly complex and dynamic interaction. It leads to issues, such as information asymmetry, over-specified tenders, not efficient feedback loops, etc. As result, projects can rarely match objectives of organizations. This paper explores the use of participatory simulation to help holistically investigate a project procurement process. Based on case studies from the Swedish road construction field, it can be concluded, that a participatory simulation is an effective approach to experiment with the effects of project procurement.

  • 39.
    Kornevs, Maksims
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Baalsrud 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.
    Gaming Simulation Validation: Matching Participants’ Worldviews with Their Decisions2019In: ISAGA 2018, 2019Conference paper (Refereed)
    Abstract [en]

    Gaming simulation is a successful approach to many issues where a holistic view is important. However, to use results from gaming simulations, the game has to be validated. This paper proposes a two-step approach for process validation of behavior for the gaming simulation by comparing decisions that players make in a game with the perceptions that affect their real-life decisions. Two case studies, where this approach was applied, are presented and the results are analyzed and discussed. A strong correlation between behavior during the games and in the real world was observed. This correlation indicates that gaming simulations in these cases are validated and represent the real system in an accu-rate manner. Thus, these cases show that the proposed approach works and can be used for validation of gaming simulations.

  • 40.
    Krumlinde Lundvall, Daniel
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Odenbrand Linder, Jacob
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Utveckling av en trefaslogger: En kostnadseffektiv trefaslogger med transientdetektering2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Tools that can analyse and detect problems on a three-phase grid can save time and decrease energy consumption in the industry. The range of products available on today’s market either comes with a steep price, or limited functionality.

    This thesis examined the possibility of developing and producing a three-phase logger with transient detection, that could be sold for less than 4000 SEK including sales margin. The work mainly consisted of hardware development. The choice of hardware emanated from function analyses, whereupon a complete schematic and PCB-design was developed. The result showed that a three-phase logger with transient detection could be produced and sold for approximately 3300 SEK, including a 25 % sales margin. The thesis was done at Motion Control in Västerås at the request of ABB Robotics.

  • 41.
    Kärrbrant, Robert
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Labriz, Daniel
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Analys av simulation för implementationer i en automatiserad verkstad2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A workshop that produces gearboxes planned to remodel the workshop. There were several problems that indirectly affected the production. The fact that trains stood still without doing active work on the main road in the workshop was a major problem. Another problem was that there were too many trains in the workshop. The planned reconstruction was to reduce the number of trains in the workshop. With the remodel, those responsible for the workshop wanted to explore further possibilities on how the workshop could be changed. It was also interesting to see if the implementation of changes would give an increased production.

    The goals were to create a simulation tool to investigate how different solutions based on the rebuild could affect a train that loaded the material into assembly lines in the workshop. To be able to test different solutions, a simulation model needed to be developed and verified against the existing solution. Then the model was expanded to test new solutions.

    From the workshop there was data on the consumption of materials. For the train that would load up on materials, there were theoretical times for various work tasks. The consumption of materials behaved according to a random distribution that was normally distributed. The result was that only the consumption of materials could be verified as there was only data on how the consumption of materials took place. Remaining parts of the simulation used theoretically planned values. Of the solutions investigated, it was a solution with a new bus stop on a less busy road, where a train could wait, that showed a more desirable result than the others that were investigated.

  • 42.
    Lange, Alfons
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Lindfors, Erik
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    En jämförelse av inlärningsbaserade lösningar för mänsklig positionsuppskattning i 3D2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In fields such as sports science and entertainment, there’s occasionally a need to an- alyze a person's body pose in 3D. These needs may include analyzing a golf swing or enabling human interaction with games. Today, in order to reliably perform a human pose estimation, specialized hardware is usually required, which is often expensive and difficult to access. In recent years, multiple learning-based solutions have been developed that can perform the same kind of estimation on ordinary images. The purpose of this report has been to identify and compare popular learning-based so- lutions and to investigate whether any of these perform on par with an established hardware-based solution. To accomplish this, tools for testing have been developed, pose estimations have been conducted and result data for each test have been ana- lyzed. The result has shown that the solutions do not perform on par with Kinect and that they are currently not sufficiently well-developed to be used as a substitute for specialized hardware.

  • 43.
    Larsson, Christoffer
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Wångenberg Olsson, Adam
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Automatisk dataextrahering och kategorisering av kvitton2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Employees at companies sometimes make purchases on behalf of the company which they manually need to document. To ease the documentation of purchases made by employees at Consid AB, this study has had the goal to develop a service that from an image of a receipt can extract relevant data such as price, date, company name along with a category of the purchase. The resulting service can extract text from receipts with a confidence of 73 % in that the text is correct. Tests of the service shows that it can find price, date and company name on around 64 % of test receipts with different quality and contents. The resulting service has also implemented two different methods for categorisation where half of the test receipts could be categorised by both methods. After analysing methods and results, conclusions have been made in that the service contains of numerous flaws and that more time needs to be put in to optimise and test the service.

  • 44.
    Laura Marie, Feeney
    et al.
    Uppsala University.
    Charalampos, Orfanidis
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Jacobsson, Martin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Per, Gunningberg
    Uppsala University.
    Poster Abstract: Preliminary results on LoRaWAN and IEEE 802.15.4-SUN Interference2018Conference paper (Refereed)
    Abstract [en]

    We present some preliminary results on LoRaWAN and IEEE 802.15.4- SUN interference in urban environments. The results are based on a simple simulation that is parameterized using PHY layer measurements of controlled interference scenarios

  • 45.
    Liljedahl, Hampus
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Persson, Arvid
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Sensorbaserad skosula: Utveckling av prototyp för uppföljning efter behandling av idiopatisk tågång2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report goes through the development of a sensor-based insole. The insole was designed with multiple pressure sensors which are then visualized on a mobile application. The mobile application was connected to the insole via Bluetooth. It is common for toddlers to prefer toe walking. If the child does not stop toe walking after the age of 2-3 years, you should contact a doctor. There are different kinds of treatment for these children. Today there isn’t a good solution to evaluate the children post treatment. The prototype is designed to meet the requirements needed to give a good assessment of whether the child has improved or not. The report also addresses other use cases for the insole. The conclusion on the report is that development of the product is possible but requires more research in the field as well as further development of the prototype. The prototype is in a too early stage to perform true tests on a trial group. To validate the sensor's precision, appropriate test cases should be developed. 

  • 46.
    Lindblom, Marcus
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Åhlin, Robin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Medical counselling via video using WebRTC: User interface and user experience design2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    CareLigo is a medical technology company that supplies heart failure patients with a home-based care solution called OPTILOGG. OPTILOGG helps patients to keep track of their symptoms, provides medication instructions and educates them about their illness. CareLigo requested an expansion of OPTILOGG which would allow patients to talk to care providers via video communication.

    This thesis describes the creation of this video communication solution and how this can be done in the best way for both patients and caregivers. Based on literature studies on human-computer interaction, user interface (UI) and user experience (UX) design, a standalone Android application was developed for care providers as well as an extension in OPTILOGG taking into account that the users of OPTILOGG are often elderly with multimorbidity. Three accessibility aids were added to the extension of the OPTILOGG Android application in addition to the video solution. The first helping addition was a touch area expansion for buttons. The second aid was a screen reader feature that vocally describes objects the user clicks on. The third tool was a speech recognition feature that allowed patients to navigate in OPTILOGG with voice. The video communication between the standalone care provider application and OPTILOGG was based on WebRTC and was developed using a software development kit from a cloud communications provider called Sinch.

  • 47.
    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.

  • 48.
    Lo, Julia C.
    et al.
    ProRail, Dept Innovat & Dev, Utrecht, Netherlands.
    Sehic, Emdzad
    Meijer, Sebastiaan A.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics. Delft Univ Technol, Fac Technol Policy & Management, Delft, Netherlands.
    Balancing organizational and academic research: Investigating train affic Controller's geographical workspace design and team situation areness using gaming simulations2019In: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 10, p. 34-45Article in journal (Refereed)
    Abstract [en]

    In innovating and designing new concepts in the railway sector, the tch railway infrastructure manager ProRail uses different types of mulations to identify and tackle possible bottlenecks in future frastructure design. Computer simulation tools are used in earlier ages of the design process, followed by the application of gaming mulations where the design is fine tuned together with railway traffic erators before it is put into operation. This study focuses on oviding insights into the use of a human-in-the-loop simulator in ich an organizational research question investigates the impact of ltiple geographical workspace designs, while in parallel human factors search is conducted to investigate the concept of team situation areness from an academic research interest. Finding a balance between e practical and academic implications in one research design and its ndings does not rely on a trivial approach. The current article aims contribute on several levels: (1) to illustrate the balance between search for practice and research for academia through the applications gaming simulations; (2) to illustrate the use of gaming simulations r railway traffic operations and (3) to provide insights in team SA velopment in railway traffic operations using gaming simulations.

  • 49.
    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.

  • 50.
    Löfstrand, Sebastian
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Fredén Lundvall, Jonas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Utvärdering av Movesense för användning vid biomekaniska studier2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There is a need to be able to utilize a user-friendly system for interaction with body-worn sensors in teaching and research at the school for chemistry, biotechnology and health at the Royal Institute of Technology. Responsible persons at the program have therefore assigned a Bachelor of Science (BSc) degree project to investigate whether a specific sensor system, Movesense, can serve as a user-friendly tool for studying biomechanical movements within education and research. A preliminary study is carried out to examine the sensor system's potential. A system prototype is developed for configuring the sensor system and retrieving sensor data. A quantitative evaluation of collected data from the sensor system, and video analysis is performed to determine whether it is possible to perform motion analysis using the system prototype. The investigation resulted in a functioning system prototype, and that Movesense can be used as a tool for studying certain types of movements. The prototype has great development potential, and the sensor system has potential opportunities in education and research. 

123 1 - 50 of 109
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf