1234567 1 - 50 of 519
rss atomLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
  • Boltshauser, Rasmus
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
    Zheng, Jimmy
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems.
    Automatisering av skjuvvågselastografidata för kärldiagnostisk applikation.2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning

     

    Hjärt- och kärlsjukdommar är den ledande dödsorsaken i världen. En av det vanligaste hjärt- och kärlsjukdomarna är åderförkalkning. Sjukdomen kännetecknas av förhårdning samt plackansamling i kärl och bidrar till stroke och hjärtinfarkt. Information om kärlväggens styvhet kan spela en viktig roll vid diagnostiseringen av bland annat åderförkalkning. Skjuvvågselastografi (SWE) är en noninvasiv ultraljudsbaserad metod som idag används för att mäta elasticitet och styvhet av större mjuka vävnader som lever- och bröstvävnad. Dock används inte metoden inom kärlapplikationer, då få genomgående studier har utförts på SWE för kärl. Målet med projektet är att automatisera kvantifieringen av skjuvvågshastigheten för SWE och undersöka hur automatiseringens förmåga och begränsningar beror av automatiseringsinställningar. Med verktyg erhållna från CBH (skolan för kemi, bioteknologi och hälsa) skapades ett MATLAB-program med denna förmåga. Programmet applicerades på två fantommodeller. Automatiseringsinställningarna påverkade automatiseringen av dessa modeller olika, vilket innebar att generella optimala inställningar inte kunde finnas. Optimala inställningar beror på vad automatiseringen skall undersöka.

     

  • DERUELLE, Tristan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    MULTI-CENTER QUANTITATIVE MEASUREMENT OF T1 ANDT2 RELAXATION TIMES IN THE RAT BRAIN2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This project revolves around the measurement of T1 and T2 relaxation times in the ratbrain, in a multi-center way. That is to say, elaborate an efficient protocol to calculate highresolution 3D map of the brain. This protocol should be applied in different centers andreturn similar results. Finally, procedures should be defined to ease the collaborationbetween the different centers. The first step consisted in in vitro experiments, in whichdifferent sequences were tested. It resulted that the MDEFT sequence with inversionpreparation (MPRAGE) gives the best results in the shortest time for T1. For T2, theMSME sequence was chosen. The next step moved on in vivo experiments on three rats inorder to get used to manipulating living animals and make new adjustments. As thephysiology is not the same on in vitro and in vivo experiments, some parameters had to beslightly adapted. Once the final 2h-protocol was established, it was tested on a populationof ten rats. Experiments were made at the GIN and CRMBM. Different fitting pipelineswere tried (GIN, CRMBM, MIRCEN). The brain was segmented into different regions. Itresulted that the GIN and CRMBM pipelines return the same T1 values using the differentdatasets. The MIRCEN pipeline under-estimates by 200 ms. The three pipelines return similar T2 values. The GIN and CRMBM datasets provide comparable T1 values, but theGIN center presents slightly higher T2 values. Regarding the multi-center collaboration,the different pipelines were ported to the VIP platform so that the scientific community caneasily reuse them.

  • Ahmed, Sunny
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Olsson, Linnéa
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Urbanears Ugglan - Studying Usercentered Designin Product Development2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This report describes the master’s thesis conducted by Sunny Ahmed and Linnéa Olssonat KTH Royal Institute of Technology for the client Zound Industries. By exploringemerging technologies and user needs, the project members developed a design proposal forheadphones for active users that can be released in three to five years’ time.Urbanears Ugglan is the headphone solution that allows you to take control of your physicalactivities and experience true freedom. It consists of two parts: true wireless earphonesand a wearable wrist accessory that stores and charges the earphones on the go, while alsofunctioning as a fitness tracker.Aside from the first purpose of creating the design proposal, the second purpose of the thesiswas to investigate the impact of involving the intended user in the design process duringproduct development when adopting a user-centered design approach.Different methods were used to gather relevant information. Both market research and atechnical trend analysis were done as background research, and complemented the userstudies. The insights discovered from these phases were used to generate concepts, fromwhich one was selected for further development after discussion with the client company. Thisconcept evolved into the final design proposal, Urbanears Ugglan.The project team found a positive impact from using user-centered design and involving theuser in several stages of the project. Including the intended user in the development led toa better understanding of their needs and values, which in turn allowed the project team toquickly verify the potential of product ideas.

  • Sriram, Abhijith
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Study of pitch bearings in wind turbines: a model based approach2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The world today is heading towards a more sustainable lifestyle in every aspect ranging from the clothes worn, transportation and even energy generation. The change towards lowering the carbon footprint is a slow but steady process, in which the wind industry play a major role.The project’s aim is to study the behavior of the pitch bearing under constant wind load conditions, investigate the load distribution between the rolling elements in the bearing and finally to determine the contact conditions that exist between the raceways and the rollers. The bearing load is calculated by assuming a quasi-static loading as the blade completes one revolution. A simplified finite element model is then built where the stiffness of the rollers is modeled onto special connector elements, which consumes less computational resource and still delivers an accurate result.The cyclic nature of loading is one of the major source of fatigue failure of these bearings. The load distribution data suggests uneven loading of the rolling elements and how certain rollers in a particular position are always more heavily loaded than the others. The loading information is also used to map the position of maximum contact pressure on to the surface of the rollers and how it changes with time.At the first glance, the pitch bearing might appear relatively insignificant compared to rest of the components, but a proper functioning of these bearings is essential for safe operation of the WT (Wind Turbine). The results of this work have thrown light into the proficiency of these bearings and the need for an alternate solution that is more efficient and better optimized for this application.

  • Colazio, Stefan
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Conceptual Design of a Powertrain for an Autonomous Golf Ball Collector2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis presents the result of a master thesis in machine design at KTH. The task was performed for Poki Robotics via the consulting firm Omecon.Poki Robotics wants to generate an autonomous solution for the collecting of golf balls on driving ranges, by utilizing a wheeled autonomous mobile robot coupled with a towed collecting unit. According to Poki Robotics, 5000 golf balls are collected on a busy day, yielding a total mass of approximately 230 kg that must be collected and towed. This sets high demands on the towing force that needs to be provided by the powertrain.The report describes the concept generation of the powertrain for a wheeled autonomous robot. A prestudy was done to evaluate wheeled locomotion in mobile robotics. Different steering systems were evaluated by different metrics including mechanical complexity, efficiency, mobility and demand for software-based control. The steering systems were evaluated using Pugh matrices, yielding two steering systems that showed to be promising. A terramechanical analytical model was used to further evaluate tractive performance of the two steering systems, to conclude which steering system was most suitable for the purpose with respect to the set requirements.Concepts were generated and evaluated for the powertrain of the chosen steering system, with respect to maintenance, assembly, manufacturing, robustness and load carrying capacity. The final concept yielded an EC-motor with a planetary gearhead, with a parallel wheel shaft and a timing belt gearing.The concept generation resulted in a CAD-model showing that the powertrain met the targeted dimensional constraints.The terramechanical analytical modelling was used solely as a tool for indication of performance and as input data for design. The model has limitations due to it not being suitable for small wheel diameters, not taking root reinforcement of the soil into account and excluding the pneumatic tire’s elastic properties.

  • Siriwardhana, Siriwardhana Jathunge Dharshana Samantha
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Introducing of Small Scale Waste to Energy Incineration Plantfor Hotel; Heritance Ahungalla in Ahungalla, Sri Lanka2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The disposal of Solid Waste has become one of the major environmental issues in SriLanka. Solid waste is often cited as a key cause contributing to environmental degradation.Rapid industrialization and unplanned urbanization has made Asian cities a victim of unmanageablesolid waste. Most of Urban Cities of Sri Lanka, are facing the same problemand still no proper solution has been introduced by the governing parties other than opendumping, which is again generating a huge problem among people, who are living aroundthe area. Balaptiya, where is in down south of Sri Lanka, is one of the urban cities of SriLanka and their daily waste generation is around 5500 kg, which is collected by BalapitiyaLocal Authority and sent to the open dump site at Heenatiya. This city is very popular fortourism as it is in between very famous tourism cities of Bentota and Hikkaduwa. Therecan be seen so many hotels around the city. Among them, Hotel Heritance Ahungalla,which is one of the five star’s hotels in Sri Lanka, locates within Balapitiya Local Authority.Their waste generation is about 600 kg per day.This study is mainly focusing on introducing small scale solid waste incinerator for Municipalsolid waste collected within Balapitiya Local Authority and Hotel Heritance Ahungalle.Hotel Heritance Ahungalla locates down south of the country and is facilitating 152 standardrooms for their guests. The daily hot water requirement is 30 m3, which is currentlysupplying by an oil fired boiler, which monthly running cost is exceeding LKR 1.2 million,for the room usage as well as cloths drying purposes. The waste heat generated by the proposedincinerator is planned to be used to generate saturated steam, while keeping the oilfired boiler in standby condition. Ultimately, this will save the money spending for the fuelfor the oil fired boiler.In this study, the capacity of incineration plant was optimized to 335kg/hr, which is containingof about 837.5 kW of gross energy, by calculating of available solid waste amountfrom the hotel as well as local authority and adding percentage increment forecasting of future.Accordingly, the size of the furnace was calculated. Finally, burning of this solidwaste will help to produce 3.7 tons/hr of saturated steam, which will meet the hotel dailysteam requirement.

  • Poljo, Harun
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Generation and Selection ofInnovative Ideas in Cross-Functional Teams: The role of communication and information diversity2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Making use of cross-functional teams is in practice one of the most common ways to implementinnovations in firms. The access to diverse information in such team has been pointed out asone of the key benefits. Research studies show however conflicting results when it comes tothe relation between the team’s access to diverse information and innovation. One reason maybe due to that research on cross-functional teams has mainly focused on the relation betweencross-function teams and innovation as an outcome, and have paid less attention to understandhow this may differ along the innovation process. In this study, the role of cross-functionalteams in the first step of an innovation process i.e. the idea generation and selection isinvestigated particularly to understand related challenges and how it successfully can bemanaged.Nine project leaders with experience from managing cross-functional teams in idea generationand selection in different high-technology companies were interviewed. The result from thestudy shed light on the role of personal conflicts during idea generation and selection. Thepersonal conflicts originate from that each team member could have goals for products thatcontradict goals of the other team members. The access to diverse information also imposeschallenges, since it many times is associated with the use of a diverse vocabulary, hinderingteam members to understand the information that is shared during idea generation. The teammembers also lack the knowledge and time to judge if information from another team memberis credible. Some challenges also arise as a consequence from how the idea selection process inthe idea generation phase is designed. In addition, the study is able to identify some usefulproject management strategies for handling idea generation and selection in cross-functionalteams.The study indicates that findings in the emerging research field of transactive memory systems(TMS) theory could potentially be a novel and supportive tool by improving understanding onthe role of communication and information diversity in cross-functional teams in the ideageneration and selection process. It could potentially support research on that autonomouscross-functional teams are suitable for radical innovation, since the team has a higheropportunity to interact and develop a strong TMS. Finally, the thesis, makes suggestions forfuture research on TMS and idea generation and selection in cross-functional teams.

  • Svensson, Joel
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy and Climate Studies, ECS.
    Knowledge base and perception on sustainability in the long-haul transport sector in Brazil2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    demand for truck transportation is increasing and in the shadow the CO2 (carbon dioxide) emissions. In many parts of the world the majority of the transportation of goods is done by long-haulage trucks. More than 60% of all goods transported in Brazil are made by trucks (André Luiz Cunhaa, 2011). Therefore, it is critical to find solutions and actions on how to reduce the CO2 footprint.This thesis presents an evaluation of the knowledge and perceptions of sustainability among truck drivers and long-haulage freight transport companies in Brazil. For this, surveys to drivers and with a combination of surveys and interviews to logistics companies were done. The surveys and interviews covered energy and environmental related questions such as eco-driving, alternative fuels, fuel reductions actions, emissions, engine efficiency and the EU emissions standards.It has been found that only slightly more than half of the truck drivers have education in eco-driving despite that eco-driving is considered as the strongest action for reducing fuel consumption. In addition, many drivers do not know the benefits with eco-driving. However, this lack of knowledge among the drivers is in contrast known by the logistic companies. All logistics companies stated that eco-driving can decrease the fuel consumption by 10%, based on experience. The results are also an indication that there is a connection between companies with profit and eco-driving education. For companies with profit, 70% of the truck drivers have been educated in eco-driving, whereas companies with economic loss only 50% of the truck drivers are educated eco-driving . Another finding is that around half of the driver does not know the difference between the European emissions standards, again in contrast to the logistic companies management were all contacted knew the difference, i.e. emissions. This potentially indicates a lack of knowledge exchange between the management in logistic companies and the truck drivers.In addition to eco-driving, the drivers and logistics companies consider driving outside peak hours and the use of connectivity as strong actions for reducing their fuel consumption. Increasing the load capacity and custom made truck was not a frequent answer when asking how the drivers think they can reduce their fuel consumption. A result is also that one third of the logistic companies have been considering switching from petroleum diesel to alternative fuels.Both the truck drivers and the logistic companies know that the currently used trucks are not a sustainable transportation mode. They see the lack of economic incentives as the highest barrier for a more environment friendly transportation system and not the technology needed.In order to reduce the greenhouse gas emissions from the long-haulage sector, more drivers must be educated in eco-driving and the knowledge has to be increased regarding among other the benefits with eco-driving and the difference between the Euro standards. Decreasing the amount of empty trips is also an approach that should receive more attention.

  • Brissaud, Antoine
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Performance and model calibration ofhigh-pressure compressors2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    To fully determine the performances of high-pressure compressors (HPC), modeling and partial tests can beperformed to characterize its different operating conditions. Nevertheless, there are still noticeable errorsbetween the results of these models and the tests: deformations and differences can appear, and notably becauseof a modeling defect or the assumptions made during the analysis (measurement corrections for example). Tomodel the closest to the tests, it is therefore necessary to include all the different elements impacting theperformances of the compressor performance map to model the operating points correctly. The purpose ofthe thesis is to take in charge a new software that predicts the performances of high-pressure compressors,built in Python where a compressor can be decomposed in elementary axial and/or centrifugal compressorsusing their respective compressor performance map. By a stacking technique it is possible to characterize theoperating point of the main compressor by knowing the inlet and the outlet conditions, and to include severaldeformation models such as Reynolds number effects, Variable Stator Vanes (VSV) effects, or tip clearanceeffects on the performances of the compressor. A calibration function also allows the development of newversions of the previous deformations models and it quantifies the unknowns and uncertainties betweencomputed and tested results. Several working points at off-design conditions were computed with specificoperating conditions such as the opening of a handling bleed valve. Deformations models of this specificcondition was built to mitigate the uncertainties between computed and tested results and include thephenomenon to the modeling. Several deformations models were also compared for efficiency purposes.

  • Maurel, Marion
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Performance Testing of a MobileThermal Energy Storage System2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In Europe, the industry sector constitutes 31 % of the global energy demand and among this, 20 to 50 %of the total energy input is lost as heat released to the atmosphere. In the meantime, the EuropeanCommission Energy Roadmap 2050 recognizes the essential role of energy storage in the process ofdecarbonisation of the European energy system.In line with these observations, the Energy Department of the Royal Institute of Technology (KTH) istesting and developing a project entitled Heat on Wheels. The basic principle of this project is to collectsurplus heat of industry and to bring it to users – e.g. via a district heating network – using a phase changematerial (PCM) as an intermediate to store the energy and carry it from one point to another in a mobilethermal energy storage (M-TES) unit.This thesis takes part in testing the performances of Erythritol as a PCM storing and releasing energy in aprototype at KTH. The prototype consists of tube heat exchanger submerged in PCM. The HTF eithermelts the PCM (endothermic process) or freezes it (exothermic process). The M-TES storage density isaround 178 kWh/m3.The results show a 2.50 times longer charging time and a 1.62 times longer discharging time with a halvedHTF flow. Halving the HTF flow also leads to a 50 % decrease in power in the PCM over the wholecharge process. The power received by the HTF during the whole process is halved when increasing thedischarge HTF temperature by 33 %. The melting/freezing process of the PCM is dependent on thelocalization in the storage unit. Nevertheless, technical grade Erythritol seems to sustain repeatedwarming-cooling cycles, without noticeable storage degradation.The study also showed that with the proposed design, upscaling M-TES with a 700 % increase in lengthwould result in an overall heat transfer coefficient multiply on average by 7 ensuring thus an even fastercharge/discharge process.A recommendation for future work is to investigate how to homogenize the melting/freezing of the PCMin the heat exchanger, maybe by better spreading the HTF flow in between the pipes. It would also beadvantageous to work on reducing the losses in between the charge and the discharge in order to keep asmuch energy as possible. Further studies on the impact of upscaling the laboratory prototype can also beconducted, taking into account different designs such as a larger pipe diameter for instance.

  • Mattisson, Emmy
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Increased leaching of metals as a result of foundation work2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Heavy metal contamination in the environment is a global issue that is likely to increase in the future. This report investigates a construction area in which increased concentrations of the heavy metals cadmium, cobalt, copper, nickel and zinc and a decreased pH-value has been observed in the surface water recipient. The focus is on assessing contamination characteristics and identifying suitable remediation methods to avoid a river protected by environmental quality standards further downstream from getting contaminated. The bedrock in the area is sulphide containing and releases acidic leachate when oxidising, which is assumed to have occurred due to plane blasting and filling of residual rock. The contamination characteristics were assessed with the statistical methods modified double mass analysis and principal components analysis. A water balance was established to obtain the flowrates, discharge volumes and to determine the masses of the released metals in the surface water. Identification of suitable remediation methods was performed through a literature study of available remediation methods and using the findings of the assessments as basis. The results showed that there was a significant increase in metal concentrations and decrease in pH-value roughly around the same time as blasting and filling of residual rocks in the area was begun and that there were elevated levels of sulphide and sulphur, but they could not be specifically linked to any media. The yearly masses of metals released from the area into the surface water were between 77-98 % higher than allowed by the established guidelines. By separating the water assumed to carry the majority of the contaminants from the remaining natural water in the watershed, the volume that needs to be treated can be halved. As the contamination is so extensive, a mixture of remediation methods was proposed, including installing green roofs to decrease the runoff from the area, confining the crushed rock with bentonite and installing a filter for fast, efficient reduction. For long-term remediation, it is suggested to optimise the existing sedimentation basins and wetlands. The conclusions were that it will be very expensive to remediate the contamination, due to the extent and magnitude, and that handling sulphide containing bedrock for construction purposes should be legally regulated in order to avoid negative environmental and economic impacts. 

  • Public defence: 2018-09-03 13:15 Sal Ka-208, Kista, Stockholm
    Castañeda Lozano, Roberto
    KTH, School of Electrical Engineering and Computer Science (EECS), Software and Computer systems, SCS. RISE SICS (Swedish Institute of Computer Science).
    Constraint-Based Register Allocation and Instruction Scheduling2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Register allocation (mapping variables to processor registers or memory) and instruction scheduling (reordering instructions to improve latency or throughput) are central compiler problems. This dissertation proposes a combinatorial optimization approach to these problems that delivers optimal solutions according to a model, captures trade-offs between conflicting decisions, accommodates processor-specific features, and handles different optimization criteria.

    The use of constraint programming and a novel program representation enables a compact model of register allocation and instruction scheduling. The model captures the complete set of global register allocation subproblems (spilling, assignment, live range splitting, coalescing, load-store optimization, multi-allocation, register packing, and rematerialization) as well as additional subproblems that handle processor-specific features beyond the usual scope of conventional compilers.

    The approach is implemented in Unison, an open-source tool used in industry and research that complements the state-of-the-art LLVM compiler. Unison applies general and problem-specific constraint solving methods to scale to medium-sized functions, solving functions of up to 647 instructions optimally and improving functions of up to 874 instructions. The approach is evaluated experimentally using different processors (Hexagon, ARM and MIPS), benchmark suites (MediaBench and SPEC CPU2006), and optimization criteria (speed and code size reduction). The results show that Unison generates code of slightly to significantly better quality than LLVM, depending on the characteristics of the targeted processor (1% to 9.3% mean estimated speedup; 0.8% to 3.9% mean code size reduction). Additional experiments for Hexagon show that its estimated speedup has a strong monotonic relationship to the actual execution speedup, resulting in a mean speedup of 5.4% across MediaBench applications.

    The approach contributed by this dissertation is the first of its kind that is practical (it captures the complete set of subproblems, scales to medium-sized functions, and generates executable code) and effective (it generates better code than the LLVM compiler, fulfilling the promise of combinatorial optimization). It can be applied to trade compilation time for code quality beyond the usual optimization levels, explore and exploit processor-specific features, and identify improvement opportunities in conventional compilers.

  • Kadir, Shyar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Özkan, Selman
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    EctogridTM: The competitiveness of a low temperature district heating network in Germany and United Kingdom2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    It is known that the heating and cooling market constitutes a large part of energy market across Europe and that the domestic and non-domestic buildings have together the largest share of energy demand. The aim of the European climate goals is to reduce the use of fossil fuel based systems and the allowance of energy demand. These have been striving reasons to increase efficiency and reduce GHG emissions on energy systems for buildings. The climate goals and regulations mentioned in this study implicates that European countries strives towards renewable sources in the heating sector, and encouraging heating networks with renewable sources.

    E.ON has developed a new low temperature district heating and cooling system called EctogridTM, a heat network integrated with heat pumps and cooling machines to supply energy. This thesis will thoroughly describe this heating and cooling system, called EctogridTM, and its constitutive components.

    The aim of this study is to determine whether the energy markets in Germany and United Kingdom are ready for an introduction of EctogridTM, and exploit existing and upcoming obstacles. To determine this, two research questions are answered through literature review, research and a case analysis.

    The first research question is evaluating the energy market in Europe with a focus on the heating demand in Germany and United Kingdom where fossil fuels are the dominating fuel. Second research question is comparing EctogridTM with a 4th generation district  heating  network, 4GDHn, in costs to evaluate the competitiveness with

    existing energy systems on the market.

    It is concluded that obstacles exist, how big they are for EctogridTM differs from country to country. How developed and flexible the infrastructure is, what energy sources and technologies are commonly used for heating purposes, building insulation, energy prices and regulations are factors that more or less variates from country to country and decides the severity of the feasible imposed obstacles.

    Germany and United Kingdom mostly uses decentralized gas boilers for the building heating demand, people often reasons them to have cheap running cost due to the energy prices. This study shows that that despite the big difference in energy price between gas and electricity for a household, heat pumps with a minimum COP of 3.5 will have lower running costs  than traditional gas boilers. Since EctogridTM uses heat pumps with a COP between 4-5, in optimal conditions, it is quite competitive in running cost to gas boilers. The obstacle here lies in most buildings being old and insufficient insulated for an EctogridTM system and the investment costs often being more expensive compared to gas boilers. Installing a heat pump or a gas boiler shows that the CO2 emissions per kWh of useful heat (kg CO2/kWh) are 0.31 for a gas boiler and 0.16 for an AHP which means a decrease in emissions of around 50% per useful kWh heat.

    The case study compared 4GDHn with an EctogridTM solution as an energy system. The case study consisted of 3 buildings with a heating and cooling need in a newly built area in Germany and United Kingdom. The study showed that an EctogridTM solution was more expensive for the customers but more profitable for producers when comparisons were made with regards to the current energy prices and estimations. However, a larger area with a much higher energy demand needs to be considered to see the real competitiveness of EctogridTM and electrified solution. A larger cooling demand will benefit EctogridTM  while reducing the profits of a 4GDHn.

    The uncertainty of the acquired data, since no pilot project exists yet, makes it hard to draw a certain conclusion whether it is a more competitive energy system than a 4GDHn and other current low carbon heating systems.

  • Masoudi, Meysam
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Azari, Amin
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Yavuz, Emre Altug
    Ericsson AB, Stockholm, Sweden.
    Cavdar, Cicek
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Grant-free Radio Access IoT Networks:Scalability Analysis in Coexistence Scenarios2018Conference paper (Refereed)
    Abstract [en]

    IoT networks with grant-free radio access, likeSigFox and LoRa, offer low-cost durable communications overunlicensed band. These networks are becoming more and morepopular due to the ever-increasing need for ultra durable, interms of battery lifetime, IoT networks. Most studies evaluatethe system performance assuming single radio access technologydeployment. In this paper, we study the impact of coexistingcompeting radio access technologies on the system performance.Considering K technologies, defined by time and frequencyactivity factors, bandwidth, and power, which share a set of radioresources, we derive closed-form expressions for the successfultransmission probability, expected battery lifetime, and experienceddelay as a function of distance to the serving access point.Our analytical model, which is validated by simulation results,provides a tool to evaluate the coexistence scenarios and analyzehow introduction of a new coexisting technology may degrade thesystem performance in terms of success probability and batterylifetime. We further investigate solutions in which this destructiveeffect could be compensated, e.g., by densifying the network toa certain extent and utilizing joint reception.

  • Azari, Amin
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Bria, Aurelian
    System and method for providing communication rules based on a status associated with a battery of a device2017Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    The disclosure relates to communication systems and, more particularly, to a system and method for providing communication rules based on a status associated with a battery of a device.

  • Azari, Amin
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Cavdar, Cicek
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Performance Evaluation and Optimization of LPWAIoT Networks: A Stochastic Geometry Approach2018Conference paper (Refereed)
    Abstract [en]

    Leveraging grant-free radio access for enabling lowpowerwide-area (LPWA) Internet of Things (IoT) connectivityhas attracted lots of attention in recent years. Regarding lack ofresearch on LPWA IoT networks, this work is devoted to reliabilitymodeling, battery-lifetime analysis, and operation-controlof such networks. We derive the interplay amongst density ofthe access points, communication bandwidth, volume of trafficfrom heterogeneous sources, and quality of service (QoS) incommunications. The presented analytical framework comprisesmodeling of interference from heterogeneous sources with correlateddeployment locations and time-frequency asynchronousradio-resource usage patterns. The derived expressions representthe operation regions and rates in which, energy and costresources of devices and the access network, respectively, couldbe traded to achieve a given level of QoS in communications. Forexample, our expressions indicate the expected increase in QoSby increasing number of transmitted replicas, transmit power,density of the access points, and communication bandwidth.Our results further shed light on scalability of such networksand figure out the bounds up to which, scaling resources cancompensate the increase in traffic volume and QoS demand.Finally, we present an energy-optimized operation control policyfor IoT devices. The simulation results confirm tightness of thederived analytical expressions, and indicate usefulness of themin planning and operation control of IoT networks.

  • Azari, Amin
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Cavdar, Cicek
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Self-organized Low-power IoT Networks: ADistributed Learning Approach2018Conference paper (Refereed)
    Abstract [en]

    Enabling large-scale energy-efficient Internet-ofthings(IoT) connectivity is an essential step towards realizationof networked society. While legacy wide-area wireless systemsare highly dependent on network-side coordination, the level ofconsumed energy in signaling, as well as the expected increase inthe number of IoT devices, makes such centralized approachesinfeasible in future. Here, we address this problem by selfcoordinationfor IoT networks through learning from pastcommunications. To this end, we first study low-complexity distributedlearning approaches applicable in IoT communications.Then, we present a learning solution to adapt communicationparameters of devices to the environment for maximizing energyefficiency and reliability in data transmissions. Furthermore,leveraging tools from stochastic geometry, we evaluate theperformance of proposed distributed learning solution againstthe centralized coordination. Finally, we analyze the interplayamongst energy efficiency, reliability of communications againstnoise and interference over data channel, and reliability againstadversarial interference over data and feedback channels. Thesimulation results indicate that compared to the state of the artapproaches, both energy efficiency and reliability in IoT communicationscould be significantly improved using the proposedlearning approach. These promising results, which are achievedusing lightweight learning, make our solution favorable in manylow-cost low-power IoT applications.

  • Azari, Amin
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Miao, Guowang
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Stefanovic, Cedomir
    Aalborg University.
    Popovski, Petar
    Aalborg University.
    Latency-Energy Tradeoff based on ChannelScheduling and Repetitions in NB-IoT Systems2018Conference paper (Refereed)
    Abstract [en]

    Narrowband IoT (NB-IoT) is the latest IoT connectivitysolution presented by the 3GPP. NB-IoT introduces coverageclasses and introduces a significant link budget improvementby allowing repeated transmissions by nodes that experiencehigh path loss. However, those repetitions necessarily increase theenergy consumption and the latency in the whole NB-IoT system.The extent to which the whole system is affected depends on thescheduling of the uplink and downlink channels. We addressthis question, not treated previously, by developing a tractablemodel of NB-IoT access protocol operation, comprising messageexchanges in random-access, control, and data channels, bothin the uplink and downlink. The model is then used to analyzethe impact of channel scheduling as well as the interaction ofcoexisting coverage classes, through derivation of the expectedlatency and battery lifetime for each coverage class. These resultsare subsequently employed in investigation of latency-energytradeoff in NB-IoT channel scheduling as well as determiningthe optimized operation points. Simulations results show validityof the analysis and confirm that there is a significant impact ofchannel scheduling on latency and lifetime performance of NBIoTdevices.

  • Moberg, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Wengenroth, Denise
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Effekten av unika objektmärkningar i förvaltningsskedet2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Unique asset codes is a word that emerged in the development of Nya Karolinska Solna (NKS). The purpose of the thesis is to investigate what a unique asset code is and what kind of information it generates to the facility manager. Furthermore, the purpose is to investigate what a unique asset code contributes to during the facility management and, more specifically, what it contributes to the management of NKS. To investigate this, interviews were held with respondents who took part of the development of unique asset codes at New Karolinska Solna (NKS). In order to investigate the effect of the unique asset codes in the facility management phase, a respondent from Coor, the company which is responsible for the facility management at NKS, was interviewed. In addition to interviews, a comprehensive literature study was conducted on how regular asset codes are made. The NKS project resulted in 600,000 unique asset codes, of which 150,000 of these are managed by the facility management company Coor. The information about the assets was transmitted in the form of a database that enabled Coor to link the information to the Maximo facility management software and the Forge Viewer platform. Unique asset codes were defined as a tag string that distinguishes each asset from each other in a project. The tag string contains information about, for example, placement, which system it belongs to and group. The information is reported as codes in the tag string. During the course of the work it was noted that the unique asset codes resulted in quality assured facility management work at NKS.

  • Idre, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Lindesten, Elin
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    En förenklad beslutsmodell av Real Time Locating System inom verkstadsindustrin: En fallstudie av tre produktionsenheter på företaget Scania2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • Bujosevic, Daniela
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Winroth, Lisa
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Val av leveransvillkor: En studie om hur val av Incoterms® kan öka kontrollen över inflöden av materiel för statliga myndigheter2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • Zhang, Tony
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Taktningsanalys på en monteringsbana2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Björkquist, Willand
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Liberg, Lukas
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Alternativa energisystem2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Retianza, Darian Verdy
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Design and Implementation of 4-Stroke Topology in Electric Drives2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The 4-Stroke inverter topology is investigated and implemented in thisthesis as a method to damp the oscillation at the MOSFET drain-sourcevoltage when reverse recovery occurs. The aim is lower ElectromagneticInterference source level from the power inverter. The designprocess is coming from analyzing the appropriate inductor, making asimulation in LTSPICE and making a high-performance six-layer PCBfor the high current application. Finally, the prototype is tested in differentcontrol timing, radiated emission test and conducted emissiontest.

  • Gustafsson, Patrik
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Design of Experimental Setup for Investigation of Effect of Moisture Content on Transformer Paper Ageing during Intermittent Load2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this project an experimental setup is designed to investigate the effect of intermittent load patterns in combination with moisture content on cellulose ageing. It is done by exposing groups of samples to different intermittent load patterns with varying frequency. A literature review is done on transformer insulation system and cellulose degradation. Various technical solutions to different aspects of the experimental design are reviewed. The final experimental setup is explained with the primary focus being on the hardware and programming of the controlling system. The controlling system consists of a Data Acquisition (DAQ) system from National Instruments and is programmed in LabVIEW. The controlling system is examined in two investigative tests where it performed satisfactorily. Three load patterns are developed. This project suggests how to prepare the samples and what direct- and indirect tests to apply to the insulation system for future analysis.Over the years, a considerable amount of scientific work has been devoted to understanding paper ageing in order to improve transformer diagnostics and investments for utility owners. However, transformer loading guidelines of today do not take intermittent load in combination with moisture content into account [1] [2]. Previous work suggests that the thermal models may be improved by looking into the effects of moisture content [3].The primary aim of the proposed experimental setup is to investigate whether an intermittent load pattern in combination with moisture content have a considerable detrimental effect on cellulose ageing. The intent is to contribute with new knowledge about transformer diagnostics and long-term possibly improve the current thermal models used for Dynamic Transformer Rating (DTR) which do not take this phenomenon into account. This would in particular benefit transformers with typically intermittent load patterns, e.g. a transformer connected to a wind farm or photovoltaic panels. Increasing renewable energy installations increase the need for developing the thermal models in the transformer loading guidelines to take unconventional load profiles into account.

  • Gustavsson, Viktor
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Path Control for Autonomous Four-Wheel Steered Haulers2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Path following control is a fundamental part of vehicle autonomy and over the lastdecades extensive research has been conducted towards the development of moreadvanced algorithms for path control of autonomous vehicles. The primary interestin improving path following control for autonomous vehicles is to be able to reducethe tracking error relative to the vehicle's reference path while also increasing thespeed at which trajectory tracking is possible. In this thesis, path following controlwas considered for an autonomous electric four-wheel steered hauler. For thispurpose, two dierent control paradigms were tested. Non-linear feedback controland model predictive control. Both controllers were designed to stabilize the lateraloset of the hauler in the curvilinear coordinate system constituting its referencepath. The controllers were synthesized with regards to a kinematic model of afour-wheel steered vehicle in a curvilinear coordinate system, and tuned extensivelyversus a multi-body simulation of the hauler. The MPC was also implemented inexisting ROS code for a prototype of the real hauler and its real-time schedulabilitywas tested on the machine control hardware in the hauler prototype. It was foundthat both controllers met the required tracking precision, while the model predictivepath controller performed better but at a signicantly higher cost in terms ofcomputational complexity and coding overhead.

  • Ntalianis, Ioannis
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Marketing and Entrepreneurship.
    Industrial investments' transformation and sustainability in Sweden2018Independent thesis Advanced level (degree of Master (One Year)), 60 credits / 90 HE creditsStudent thesis
  • Regard, Mikael
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Process Chain Optimization in a Smart Factory2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose with this thesis is to reduce downtime of machines androbots in a serial production line by improving communication betweenoperators and machines. Modeling a serial production line asa queuing system makes Markov chain optimization methods possible.The concept is to make machines and robots adapt its service ratesbased on status of its surrounding machines and the position of operators.In a pharmaceutical industry, a production rate of 50-60% of itsmaximum capacity is considered as normal. Unnecessary downtimecaused by machine breakdowns is one factor which reduces the productionrate. Two optimization methods were investigated, the workallocation problem and the targeting problem. It was found that thework allocation problem does not provide an optimal solution whenmodeling with a saturated model. The targeting problem provides anoptimal solution, which is a trade-off between the average amount ofproducts in a system and the cost for keeping this level.

  • Gupta, Shikha
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial Marketing and Entrepreneurship.
    Organizational Barriers to Digital Transformation2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • Sjöberg, Patrik
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Design and Implementation of an Exogenous Kalman Filter for UAVs2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    State estimations for nonlinear systems are often done using the ExtendedKalman Filter (EKF), which has good performance in terms of minimum variancefor the estimation error. However, global stability is not guaranteed,and the filter has a risk of becoming unstable. A recent paper proposes theeXogenous Kalman Filter (XKF), which combines the stability properties of anonlinear observer and the performance of the Kalman filter. The combinationof the two observers leads to better stability while the accuracy of the estimationsis maintained. The topic of this thesis is the design and implementationof an XKF for the control system of a UAV. The filter was simulated, and theperformance was compared to the existing EKF. Once the algorithm for thefilter was constructed, it was implemented in a real avionics system for UAVsand tested using real sensors. It was shown through simulations that the XKFindeed provides better stability properties for the state estimations comparedto the EKF, without loss of accuracy.

  • Ekman, Jakob
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Andersen, Tobias
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Mekanisk lösning för kraftutjämning på roterande remdriven borstkonsol2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Katsikeas, Sotirios
    KTH, School of Electrical Engineering and Computer Science (EECS).
    vehicleLang: a probabilistic modeling and simulation language for vehicular cyber attacks2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The technological advancements in the automotive industry as well as in thefield of communication technologies done the last years have transformed thevehicles to complex machines that include not only electrical and mechanicalcomponents but also a great number of electronic components. Furthermore,modern vehicles are now connected to the Wide Area Network (WAN) and inthe near future communications will also be present between the cars (Vehicleto-Vehicle, V2V) and between cars and infrastructure (Vehicle-to-Infrastructure, V2I), something that can be found as Internet of Vehicles (IoV)in the literature. The main motivations towards all the aforementioned changesin modern vehicles are of course the improvement of road safety, the higherconvenience of the passengers, the increase in the efficiency and the higher userfriendliness.On the other hand, having vehicles connected to the Internet opens them up toa new domain of interest, this no other than the domain of cyber security. Thispractically means that while previously we were only considering cyber-attackson computational systems, now we need to start thinking about it also forvehicles. This, as a result, creates a new field of research, namely the vehicularcyber security. However, this field does not only include the possible vehicularcyber-attacks and their corresponding defenses but also the modeling andsimulation of them with the use of vehicular security analysis tools, which isalso recommended by the ENISA report titled “Cyber Security and Resilienceof smart cars: Good practices and recommendations”.Building on this need for vehicular security analysis tools, this work aims tocreate and evaluate a domain-specific, probabilistic modeling and simulationlanguage for cyber-attacks on modern connected vehicles. The language will bedesigned based on the existing threat modeling and risk management toolsecuriCAD® by foreseeti AB and more specifically based on its underlyingmechanisms for describing and probabilistically evaluating the cyber threats ofthe models.The outcome/final product of this work will be the probabilistic modeling andsimulation language for connected vehicles, called vehicleLang, that will beready for future use in the securiCAD® software.

  • Muhonen, Ben
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Nilsson, Nicklas
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Optimerad kvalitetszon för slutkontroll av cylinderhuvud2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Gomez Gonzalez, Martin
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Operator authentication and accountability for SCADA servers when requests are forwarded by a middle layer2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Due to their critical nature, the actions performed by operators on IndustrialControl Systems (ICS) are subject to source authentication andaccountability. When commands are not send directly by the user, butforwarded by middle servers, the compromise of those severs threatensthe security of the whole architecture. This Master thesis provides asolution for that problem, guaranteeing authentication end-to-end whilefullling cost and performance requirements. Based on an analysis ofseveral potential solutions, digital signatures were assessed to be themost exible and secure option. Moreover, the proposed solution relieson Microsoft's Active Directory, which manages credentials on the targetarchitecture, for securely linking public keys with user identities. Aprototype implementation of the proposed design is included, togetherwith a limited performance evaluation. They have proven the validityof the design, that guarantees end-to-end authentication and accountabilityof command requests, while maintaining low implementation andmaintenance costs and a negligible impact in latency per message.

  • Bhatti, Ray Shan
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Ruck, Nimrod
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Kostnad och tekniska krav för transport av koldioxid med koldioxidlagring2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Bergström, Petronella
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Falksveden, Kim
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Produktivitetsökning av en delprocess inom sedeltryckeri2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Zhou, Linghui
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Polar Codes for Identification Systems2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Identication systems are ubiquitous, for example, biometric identication systemswith ngerprints and Face IDs, etc. Basically, the identication problemconsists of two steps. The enrollment phase where the user's data are captured,compressed and stored, for example taking the ngerprint or capturing some importantfeatures of your face. In the identication phase, an observation, yourngerprint or your face, is compared with the stored information in the databaseto provide an armative answer. Since the system involves many users, bothstoring and searching for the correct user is challenging.This project aims to implement compression and identication algorithms forthe high dimensional identication system which includes M users. Polar codesare employed to be the main toolbox. Firstly, we implement polar codes for thesource compression and then design corresponding identication mappings. Thesource compression can be seen as the channel decoding of polar codes. In theidentication phase, the observation can be seen as the side information, so wewill consider using Wyner-Ziv coding for polar codes to reconstruct and identify.In the next step, we will implement polar codes for two-layer Wyner-Zivcoding for identication systems. This will enable us to store the compresseddata in separate databases and do the reconstruction in two stages. With theenrollment mapping and identication mapping implemented, we will evaluatethe performance of the designed identication systems, such as identicationerror rate and complexity. Some possible further directions would be to implementmore advanced algorithms such as simplied or fast simplied successivecancellation encoding in source coding and universal decoding in identication.

  • Larsson, Louise
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
    Slope Stability Evaluation from a RiskManagement Perspective: Case Study: the Slussen project in Stockholm2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Site characterization and the subsequent determination of soil strengthparameters constitute a significant part of slope stability assessment.Geotechnical engineering is always governed by great uncertainties sincethe soil properties are challenging to estimate for a large soil volume. Nostandardized method exists for evaluation of soil parameters, since eachcountry uses its own methods for evaluation and interpretation of soils.Uncertainties are common in geotechnical engineering and thereforequalitative and quantitative risk management is required for most projects.The evaluation of the shear strength is essential in slope stability, since ithas a great influence on the stability. This report investigates threedifferent methods regarding the estimation of the characteristic value ofthe undrained shear strength in clay for heterogeneous soils. The followingmethods are used: de 7 with the 5 % fractile, the Swedish applicationdocuments with 𝜂-factor regarding uncertainties and the subjectiveassessment of geotechnical engineers by a questionnaire. In the case studyfor this thesis work, three quayside slopes at Slussen in central Stockholmcontaining highly heterogeneous organic clay located beneath gravel filland esker material were analysed to estimate the stability of the slopes. Theresults show that the 𝜂-factor returned the lowest values, the questionnaireresulted in the second highest and 5 % fractile basted on the samplingdistribution on the mean gave the highest values. No correlation could befound connecting the subjective estimation of the shear strength and otherinfluencing parameter. A method with low subjective judgement, that takethe spatial variability and some degree of interpretation uncertainties witha factor would be to prefer.

  • Lainio, Nellie
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Östanbäck, Christian
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Kalkylanalys av stambyten: En jämförelse av stambytesprojekt för att belysa viktiga parametrar vid initial kalkylering2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden’s real estate portfolio has a major renovation requirement. A large part of the renovations that need to be carried out are pipe replacement projects. These are major projects and not all housing associations are aware of the extent financial consequences it brings. Therefore, planning in the economy throughout the project are important. This thesis aims at seeing what affects a production estimate to differ from the actual final cost.ÅF infrastructure division thought that their calculations of the estimated cost for production too often differs to the actual final cost. At a first meeting with ÅF, it appeared that there has been discussion and thought for solutions to the problem for some time. The thesis is based on 3 issues that will provide answers on how to make a better production estimate.In order to answer the questions, project managers have been interviewed and literature has been studied. The assigned reference objects have been analyzed and compared in tables. This thesis has resulted in the insight of that the project managers at ÅF are relatively good at estimating the original cost of what the contractor produces for the pipe replacement projects. After the analysis, recommendations have been presented that can be developed and implemented in the ÅF approach to calculate their estimated cost of production even better. By calculating the costs that are not included in the original cost for the contractors in a more methodical manner, based on experience, the production cost can be optimized.The work has been going on for a limited time with delimitations and a selection of projects. The results presented in the report should be applied with caution and awareness about the differences in the projects.

  • Ali, Naik Bakhat
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Abdulzahra, Abbas
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Framtagande av system för strukturerat förbättringsarbete i verkstadsmiljö2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Sipan, Kandemir
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Mazlum, Sahin
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Utveckling av det framtida fiberfiltret2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Ali Sabah, Omar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Pääkkönen, Arto
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Optimering av robotcell2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Roxhagen, Jimmi
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Vidareutveckling av termoformningsmaskin2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Färjsjö, Felicia
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Åhlin, Jonas
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Automatisering av manuella monteringsstationer2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Bengtsson, Jim
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Wettergren, Jimmy
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Knowledge management inom produktion2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Saleh, Reem
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Kan lean stödja implementering av digitala lösningar?: digitalisering i små och medelstora (SME) företag2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Thidell, Elias
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Tillverkning av gitarrband genom metallformsprutning jämfört med vaxursmältning2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Jansson, Andreas
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Sundström, Jenny
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Minska skrotning av provartiklar2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • Olsson, Lisa
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management.
    Fastighetsmäklarens informationsgivning2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The realtor’s assignment can be anything from conveying a forest property to acondominium. In this report, the work has been limited to three types ofaccommodation: a property with a housing; the co-operative apartment; andthe relatively newly acquired 3D property condominium. The question iswhether the requirements for the realtor under the legal text will differ betweenthem and if the laws are sufficient for the estate agent to perform a good job.In this report, Fastighetsmäklarlagen (FML) especially 16-18§§ will be theframework. These paragraphs have been changed and adapted to the societyseveral times. The last major change was in 2011 and despite this, the conflicts,unequal and different discussions remain. An example was found during theanalysis of real estate brokerage inspections The Swedish Estate AgentsInspectorate’s (FMI) trials where various judgments were made regarding thedisclosure of rights of use. This has arisen because parts of 18§ FML can beinterpreted in different ways. Notifications are daily made to the FMI, whichorganisation investigates whether the broker has committed any infringementduring the sale. Two examples where the estate agent failed to accommodate acalculation of how much the housing cost will be and load of different forms ofrights. During the review of FMI's trials, there have been no conclusions thatthe admonition could differ between the types of housing. The legal text differsdepending on which type the realtor conveys.

  • Nasrullah, Ahmed
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Irakiza, Fabrice
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Analys av förluster i produktionsflöde2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis