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

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

  • 2.
    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.
    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.

  • 10.
    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.

  • 11.
    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.

  • 12.
    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.

  • 13.
    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.

  • 14.
    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.

  • 15.
    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.

  • 16.
    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.

  • 17.
    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.

  • 18.
    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).

  • 19.
    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.

  • 20.
    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.

  • 21.
    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.

  • 22.
    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.

  • 23. Hellström Karlsson, Rebecca
    et al.
    Shreenath, Vinutha Magal
    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 Mining2018Conference 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.

  • 24.
    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.

  • 25.
    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.

  • 26.
    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.

  • 27.
    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.

  • 28.
    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.

  • 29.
    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.
    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 (Refereed)
    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.

  • 30.
    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.

  • 31.
    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.

  • 32.
    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.

  • 33.
    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.

  • 34.
    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

  • 35.
    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. 

  • 36.
    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.

  • 37.
    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.

  • 38.
    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.

  • 39.
    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. 

  • 40.
    Magnusson, John
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Elias, Axelsson
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    TPS and Memory Size Optimization on a Cryptocurrency’s Ledger2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

  • 41.
    Moustaid, Elhabib
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Kornevs, Maksims
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Lindencrona, Fredrik
    SKL.
    Meijer, Sebastiaan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    A System of Systems of Mental Health in Cities: Digging Deep into the Origins of Complexity2019In: Article in journal (Refereed)
    Abstract [en]

    Mental health in urban environments is often treated from a healthcare provision perspective. Research in recent decades showed that mental illness in cities is a result of dysfunctional coordination between different city systems and structures. Given the nature of the city as a system of systems, this work builds participatorily a general system dynamic model of factors that affect mental health in urban and regional environments. Through this method, we investigated the challenges of the application of such methodology to identify important factors, feedback loops, and dependencies between systems to move forward in planning for mental health in cities. The outcome is a general model that showed the importance of factors that vary from individuals, families to communities and feedback loops that span multiple systems such as the city physical infrastructures, social environments, schools, labor market, and healthcare provision.

  • 42.
    Möller, Jenny
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Wiklund, Johan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Optimeringsverktyg för automatisk planering och reglering av produktion i småskaliga vattenkraftverk2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

  • 43.
    Nguyen, John
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Lindén, Kasper
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Creating a Back Stock to Increase Order Delivery and Pickup Availability2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Apotek Hjärtat wants to keep developing their e-commerce website and improve retrieval and delivery of orders to customers. Click and Collect and Click and Express are two options for retrieving e-commerce orders that are available if all products in the order are present in the store. By implementing a back stock in the stores with popular e-commercial items, all products of an order will more often be present in the store. The back stock will in such a way increase the availability of Click and Collect and Click and Express. The goals for the study are to conduct a pilot study, compare methods and possible solutions to implement a model to reach the goals. The pilot study was made by studying previous works in mathematical statistics methods and machine learning methods. The statistical method was accomplished through the analytical tool Statistical Package for the Social Sciences (SPSS) and Java. The machine learning method was accomplished through Python and the Scikit-learn library. The machine learning method was performed by a regression algorithm that was used to find relations between category sales and pollen forecasts. The statistical and machine learning methods were compared to each other. Both gave identical results, but the machine learning method was more functional and easier to further develop and consequently was chosen. Several models were created for a few selected product categories. The categories that did not work for the models had an unrealistic amount of sold products. These amounts could be negative or extremely high when unknown inputs were introduced. A simulation was made of the back stock to estimate how it would increase the availability of Click and Collect/Click and Express. The machine learning models could need more data for more accurate predictions. A conclusion could be made though that is possible to predict the amount of sold products of certain categories such as Allergy and Child Medicine with pollen halt taken into account.

  • 44.
    Nilsson, Robert
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Henning, Kim
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Predictions of train delays using machine learning2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

  • 45.
    Nordlund, Alexander
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Ålander, Niklas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Forecast Modelling of Future Events that Affect the Repayment Capacity of Mortgages2019Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The Swedish Financial Supervisory Authority introduced new guidelines and regulations on March 1, 2019. These regulations induced Swedish banks and other creditors to consider future events as a mean to improve their ability to determine the risk of debtors. A forecast generator was created as a tool to accomplish this. The constraints of this thesis limited the forecast generator to mortgages with four parameters: loss of income, pension, foreign currency and depreciation. The forecast generator was created by combining components of Vitec Capitex's existing mortgage calculator as well as by adding new components. The new components were utilized in advancing loans and budgets in time, as well as calculating a suitable income insurance in the case of a loss of income. Furthermore, the forecast generator could approximate the pension a debtor would receive when retired. The forecast generator could calculate the economic situation of debtors after a future event took place such as a loss of income or an early or late retirement. A suitable income insurance would prevent a debtor from insolvency in the case of an income loss.

  • 46.
    Ntis, Christina
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Causevic, Neira
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    En utvärdering av en verktygsdriven UX-designprocess: Tillämpning och utvärdering av en verktygsdriven UX-designprocess vid användning av Kibana2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

  • 47.
    Oldelius, David
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Pham, Douglas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Master Data Management-studie om nästa entiteto och leverantör för Scania2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

  • 48.
    Oliveira Lunå, Torbjörn
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Implementation av en vibrotaktil alarmklocka: Undersökning av lämpliga input-signaler och parametrar för ett behagligt och alert uppvaknande och tillhörande utvecklingskostnader2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

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

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

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

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

  • 49.
    Orfanidis, Charalampos
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Dimitrakopoulos, Konstantinos
    Fafoutis, Xenofon
    Jacobsson, Martin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Towards battery-free LPWAN wearables2019Conference paper (Refereed)
  • 50.
    Orfanids, Charalampos
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Feeney, Laura Marie
    Jacobsson, Martin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Health Informatics and Logistics.
    Gunningberg, Per
    Cross-technology Clear Channel Assessment for Low-Power Wide Area Networks2019Conference paper (Refereed)
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