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  • 1.
    Abbas, Khizra
    et al.
    KTH Royal Institute of Technology, Sweden.
    Nee, Hans-Peter
    KTH Royal Institute of Technology, Sweden.
    Kostov, Konstantin Stoychev
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Autonomously Modulating Gate Drivers For Triangular-Current Mode (TCM) Zero-Voltage Switching (ZVS) Buck Converter2023Inngår i: Proceedings of 22nd International Symposium on Power Electronics, Ee 2023, Institute of Electrical and Electronics Engineers Inc. , 2023Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper introduces a novel approach to designing autonomous gate drivers for soft-switched buck converters. The objective is to reduce switching losses, enhance converter efficiency, and reduce electromagnetic interference (EMI). The uniqueness of this converter is that the pulse-width modulation is performed autonomously on the gate driver. The gate driver makes quick decisions on switching times, capitalizing on the minimal time delay between measurements and switching. In the proposed buck converter configuration, the gate driver senses both the current and voltage across the switches to avoid delay. When a slightly negative voltage is detected across the switch, it rapidly turns on, resulting in a zero-voltage switching (ZVS). With an external snubber capacitor placed across the switches, the turn-off switching losses are zero (ZVS). Hence, both the turn-on and turn-off of the switch are soft. To enable the switch to turn off, a reference value of the switch current needs to be sent out to the gate driver using a galvanically isolated current sensor. Through this approach, the efficiency of the 7 kW buck converter has been calculated to exceed 99% without including the filter losses. Additional benefits include reduced switch stresses, diminished electromagnetic interference (EMI), and simplified thermal management.

  • 2.
    Abbas, Zainab
    et al.
    KTH Royal Institute of Technology, Sweden.
    Al-Shishtawy, Ahmad
    RISE - Research Institutes of Sweden, ICT, SICS.
    Girdzijauskas, Sarunas
    RISE - Research Institutes of Sweden, ICT, SICS. KTH Royal Institute of Technology, Sweden.
    Vlassov, Vladimir
    KTH Royal Institute of Technology, Sweden.
    Short-Term Traffic Prediction Using Long Short-Term Memory Neural Networks2018Inngår i: Proceedings - 2018 IEEE International Congress on Big Data, BigData Congress 2018 - Part of the 2018 IEEE World Congress on Services, Institute of Electrical and Electronics Engineers Inc. , 2018, s. 57-65Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Short-term traffic prediction allows Intelligent Transport Systems to proactively respond to events before they happen. With the rapid increase in the amount, quality, and detail of traffic data, new techniques are required that can exploit the information in the data in order to provide better results while being able to scale and cope with increasing amounts of data and growing cities. We propose and compare three models for short-term road traffic density prediction based on Long Short-Term Memory (LSTM) neural networks. We have trained the models using real traffic data collected by Motorway Control System in Stockholm that monitors highways and collects flow and speed data per lane every minute from radar sensors. In order to deal with the challenge of scale and to improve prediction accuracy, we propose to partition the road network into road stretches and junctions, and to model each of the partitions with one or more LSTM neural networks. Our evaluation results show that partitioning of roads improves the prediction accuracy by reducing the root mean square error by the factor of 5. We show that we can reduce the complexity of LSTM network by limiting the number of input sensors, on average to 35% of the original number, without compromising the prediction accuracy. .

  • 3.
    Abbasi, Abdul G
    et al.
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Rydberg, Anna
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Jordbruk och livsmedel.
    Altmann, Peter
    Digg Agency for Digital Government, Sweden.
    Towards a verifiable and secure data sharing platform for livestock supply chain2022Inngår i: Proceedings of the 2022 IEEE International Conference on Dependable, Autonomic and Secure Computing, International Conference on Pervasive Intelligence and Computing, International Conference on Cloud and Big Data Computing, International Conference on Cyber Science and Technology Congress, DASC/PiCom/CBDCom/CyberSciTech 2022, Institute of Electrical and Electronics Engineers Inc. , 2022Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The digitization of a supply chain involves satisfying several functional and non-functional context specific requirements. The work presented herein builds on efforts to elicit trust and profit requirements from actors in the Swedish livestock supply chain, specifically the beef supply chain. Interviewees identified several benefits related to data sharing and traceability but also emphasized that these benefits could only be realized if concerns around data security and data privacy were adequately addressed. We developed a data sharing platform as a response to these requirements. Requirements around verifiability, traceability, secure data sharing of potentially large data objects, fine grained access control, and the ability to link together data objects was realized using distributed ledger technology and a distributed file system. This paper presents this data sharing platform together with an evaluation of its usefulness in the context of beef supply chain traceability. 

  • 4.
    Abbasi, Abdul Gahafoor
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Khan, Zaheer
    University of the West of England, UK.
    Veidblock: Verifiable identity using blockchain and ledger in a software defined network2017Inngår i: UCC 2017 Companion - Companion Proceedings of the 10th International Conference on Utility and Cloud Computing, Association for Computing Machinery, Inc , 2017, s. 173-179Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Blockchain and verifiable identities have a lot of potential in future distributed software applications e.g. smart cities, eHealth, autonomous vehicles, networks, etc. In this paper, we proposed a novel technique, namely VeidBlock 1 , to generate verifiable identities by following a reliable authentication process. These entities are managed by using the concepts of blockchain ledger and distributed through an advance mechanism to protect them against tampering. All identities created using VeidBlock approach are verifiable and anonymous therefore it preserves user’s privacy in verification and authentication phase. As a proof of concept, we implemented and tested the VeidBlock protocols by integrating it in a SDN based infrastructure. Analysis of the test results yield that all components successfully and autonomously performed initial authentication and locally verified all the identities of connected components.

  • 5.
    Abdelraheem, Mohammed Ahmed
    et al.
    RISE., Swedish ICT, SICS, Security Lab.
    Gehrmann, Christian
    RISE., Swedish ICT, SICS, Security Lab.
    Lindström, Malin
    Blekinge Institute of Technology, Sweden.
    Nordahl, Christian
    Blekinge Institute of Technology, Sweden.
    Executing Boolean Queries on an Encrypted Bitmap Index2016Inngår i: CCSW 2016: Proceedings of the 2016 ACM on Cloud Computing Security Workshop, 2016, s. 11-22Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose a simple and efficient searchable symmetric encryption scheme based on a Bitmap index that evaluates Boolean queries. Our scheme provides a practical solution in settings where communications and computations are very constrained as it offers a suitable trade-off between privacy and performance.

  • 6.
    Abrahamsson, Henrik
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ben Abdesslem, Fehmi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ahlgren, Bengt
    RISE - Research Institutes of Sweden, ICT, SICS.
    Björkman, Mats
    Mälardalen University, Sweden.
    Brunstrom, Anna
    Karlstad University, Sweden.
    Marsh, Ian
    RISE - Research Institutes of Sweden, ICT, SICS.
    Selecting Operator in 3G/4G Networks for Time-Critical C-ITS Applications2018Konferansepaper (Fagfellevurdert)
  • 7.
    Abrahamsson, Henrik
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ben Abdesslem, Fehmi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ahlgren, Bengt
    RISE - Research Institutes of Sweden, ICT, SICS.
    Brunstrom, Anna
    Karlstad University, Sweden.
    Marsh, Ian
    RISE - Research Institutes of Sweden, ICT, SICS.
    Björkman, Mats
    Mälardalen University, Sweden.
    Connected Vehicles in Cellular Networks: Multi-access versus Single-access Performance2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Connected vehicles can make roads traffic safer andmore efficient, but require the mobile networks to handle timecriticalapplications. Using the MONROE mobile broadbandmeasurement testbed we conduct a multi-access measurementstudy on buses. The objective is to understand what networkperformance connected vehicles can expect in today’s mobilenetworks, in terms of transaction times and availability. The goalis also to understand to what extent access to several operatorsin parallel can improve communication performance.In our measurement experiments we repeatedly transfer warningmessages from moving buses to a stationary server. Wetriplicate the messages and always perform three transactionsin parallel over three different cellular operators. This creates adataset with which we can compare the operators in an objectiveway and with which we can study the potential for multi-access.In this paper we use the triple-access dataset to evaluate singleaccessselection strategies, where one operator is chosen for eachtransaction. We show that if we have access to three operatorsand for each transaction choose the operator with best accesstechnology and best signal quality then we can significantlyimprove availability and transaction times compared to theindividual operators. The median transaction time improves with6% compared to the best single operator and with 61% comparedto the worst single operator. The 90-percentile transaction timeimproves with 23% compared to the best single operator andwith 65% compared to the worst single operator.

  • 8.
    Aftab, Muhammad Usman
    et al.
    National University of Sciences and Technology, Pakistan.
    Hussain, Mehdi
    National University of Sciences and Technology, Pakistan.
    Lindgren, Anders
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Ghafoor, Abdul
    RISE Research Institutes of Sweden, Digitala system, Industriella system.
    Towards A Distributed Ledger Based Verifiable Trusted Protocol for VANET2021Inngår i: 2021 International Conference on Digital Futures and Transformative Technologies, ICoDT2 2021, Institute of Electrical and Electronics Engineers Inc. , 2021Konferansepaper (Fagfellevurdert)
    Abstract [en]

    To ensure traffic safety and proper operation of vehicular networks, safety messages or beacons are periodically broadcasted in Vehicular Adhoc Networks (VANETs) to neighboring nodes and road side units (RSU). Thus, authenticity and integrity of received messages along with the trust in source nodes is crucial and highly required in applications where a failure can result in life-threatening situations. Several digital signature based approaches have been described in literature to achieve the authenticity of these messages. In these schemes, scenarios having high level of vehicle density are handled by RSU where aggregated signature verification is done. However, most of these schemes are centralized and PKI based where our goal is to develop a decentralized dynamic system. Along with authenticity and integrity, trust management plays an important role in VANETs which enables ways for secure and verified communication. A number of trust management models have been proposed but it is still an ongoing matter of interest, similarly authentication which is a vital security service to have during communication is not mostly present in the literature work related to trust management systems. This paper proposes a secure and publicly verifiable communication scheme for VANET which achieves source authentication, message authentication, non repudiation, integrity and public verifiability. All of these are achieved through digital signatures, Hash Message Authentication Code (HMAC) technique and logging mechanism which is aided by blockchain technology.

  • 9.
    Agirre, Joseba A.
    et al.
    MGEP, Spain.
    Etxeberria, L.
    MGEP, Spain.
    Barbosa, R.
    University of Coimbra, Portugal.
    Basagiannis, S.
    United Technologies Research Centre, Ireland.
    Giantamidis, G.
    United Technologies Research Centre, Ireland.
    Bauer, Thomas
    Fraunhofer, Germany.
    Ferrari, E.
    Rulex Innovation Labs, Italy.
    Labayen Esnaola, M.
    CAF SIGNALLING, Spain.
    Orani, V.
    CNR-IEIIT, Italy.
    Öberg, J.
    KTH Royal Institute of Technology, Sweden.
    Pereira, David
    CISTER/ISEP, Portugal.
    Proenca, Jose
    CISTER/ISEP, Portugal.
    Schlick, Rupert
    AIT Austrian Institute of Technology, Austria.
    Smrcka, Ales
    Brno University of Technology, Czech Republic.
    Tiberti, W.
    University of L’Aquila, Italy.
    Tonetta, S.
    Fondazione Bruno Kessler, Italy.
    Bozzano, M.
    Fondazione Bruno Kessler, Italy.
    Yazici, A.
    Eskisehir Osmangazi University, Turkey.
    Sangchoolie, Behrooz
    RISE Research Institutes of Sweden, Säkerhet och transport, Elektrifiering och pålitlighet.
    The VALU3S ECSEL project: Verification and validation of automated systems safety and security2021Inngår i: Microprocessors and microsystems, ISSN 0141-9331, E-ISSN 1872-9436, Vol. 87, artikkel-id 104349Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Manufacturers of automated systems and their components have been allocating an enormous amount of time and effort in R&D activities, which led to the availability of prototypes demonstrating new capabilities as well as the introduction of such systems to the market within different domains. Manufacturers need to make sure that the systems function in the intended way and according to specifications. This is not a trivial task as system complexity rises dramatically the more integrated and interconnected these systems become with the addition of automated functionality and features to them. This effort translates into an overhead on the V&V (verification and validation) process making it time-consuming and costly. In this paper, we present VALU3S, an ECSEL JU (joint undertaking) project that aims to evaluate the state-of-the-art V&V methods and tools, and design a multi-domain framework to create a clear structure around the components and elements needed to conduct the V&V process. The main expected benefit of the framework is to reduce time and cost needed to verify and validate automated systems with respect to safety, cyber-security, and privacy requirements. This is done through identification and classification of evaluation methods, tools, environments and concepts for V&V of automated systems with respect to the mentioned requirements. VALU3S will provide guidelines to the V&V community including engineers and researchers on how the V&V of automated systems could be improved considering the cost, time and effort of conducting V&V processes. To this end, VALU3S brings together a consortium with partners from 10 different countries, amounting to a mix of 25 industrial partners, 6 leading research institutes, and 10 universities to reach the project goal.

    Fulltekst (pdf)
    Full text
  • 10.
    Agirre, Joseba A
    et al.
    Mondragon University, Spain.
    Yazici, Ahmet
    Eskisehir Osmangazi University, Turkey.
    Di Blasio, Katia
    Intecs Solutions S.p.a., Italy.
    De la Vara, Jose Luis
    University of Castilla-La Mancha, Spain.
    Sangchoolie, Behrooz
    RISE Research Institutes of Sweden, Säkerhet och transport, Elektrifiering och pålitlighet.
    Yayan, Ugur
    Inovasyon Muhendislik Ltd. Sti, Turkey.
    Barbosa, Raul
    University of Coimbra, Portugal.
    Etxeberria, Leire
    Mondragon University, Spain.
    Nazaria, Massimo
    Fondazione Bruno Kessler, Italy.
    Karaca, Mustafa
    Inovasyon Muhendislik Ltd. Sti, Turkey.
    Multidimensional Framework for Characterizing Verification and Validation of Automated Systems2022Inngår i: 18th European dependable computing conference (EDCC 2022), 2022Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Verification and Validation (V&V) of automated systems is becoming more costly and time-consuming because of the increasing size and complexity of these systems. Moreover, V&V of these systems can be hindered if the methods and processes are not properly described, analysed, and selected. It is essential that practitioners use suitable V&V methods and enact adequate V&V processes to confirm that these systems work as intended and in a cost-effective manner. Previous works have created different taxonomies and models considering different aspects of V&V that can be used to classify V&V methods and tools. The aim of this work is to provide a broad, comprehensive and a easy to use framework that addresses characterisation needs, rather than focusing on individual aspects of V&V methods and processes.To this end, in this paper, we present a multi-domain and multi-dimensional framework to characterize and classify V&V methods and tools in a structured way. The framework considers a comprehensive characterization of different relevant aspects of V&V. A web-based repository has been implemented on the basis of the framework, as an example of use, in order to collect information about the application of V&V methods and tools. This way, practitioners and researchers can easily learn about and identify suitable V&V processes.

  • 11.
    Ahlgren, Bengt
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Grinnemo, Karl-Johan
    Karlstad University, Sweden.
    Abrahamsson, Henrik
    RISE - Research Institutes of Sweden, ICT, SICS.
    Brunstrom, Anna
    Karlstad University, Sweden.
    Hurtig, Per
    Karlstad University, Sweden.
    Latency-aware Multipath Scheduling in Information-centric Networks2019Inngår i: Proceedings of the 15th Swedish National Computer Networking Workshop (SNCNW), 2019Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    We present the latency-aware multipath scheduler ZQTRTT that takes advantage of the multipath opportunities in information-centric networking. The goal of the scheduler is to use the (single) lowest latency path for transaction-oriented flows, and use multiple paths for bulk data flows. A new estimator called zero queue time ratio is used for scheduling over multiple paths. The objective is to distribute the flow over the paths so that the zero queue time ratio is equal on the paths, that is, so that each path is ‘pushed’ equally hard by the flow without creating unwanted queueing. We make an initial evaluation using simulation that shows that the scheduler meets our objectives.

  • 12.
    Ahmed, Jawwad Imtiaz
    et al.
    Ericsson Research, Sweden.
    Josefsson, Tim
    Uppsala University, Sweden.
    Johnsson, Andreas
    Ericsson Research, Sweden.
    Flinta, Christofer
    Ericsson Research, Sweden.
    Moradi, Farnaz
    Ericsson Research, Sweden.
    Pasquini, Rafael
    UFU Federal University of Uberlandia, Brazil.
    Stadler, Rolf
    RISE - Research Institutes of Sweden, ICT, SICS. KTH Royal Institute of Technology, Sweden.
    Automated diagnostic of virtualized service performance degradation2018Inngår i: IEEE/IFIP Network Operations and Management Symposium: Cognitive Management in a Cyber World, NOMS 2018, 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Service assurance for cloud applications is a challenging task and is an active area of research for academia and industry. One promising approach is to utilize machine learning for service quality prediction and fault detection so that suitable mitigation actions can be executed. In our previous work, we have shown how to predict service-level metrics in real-time just from operational data gathered at the server side. This gives the service provider early indications on whether the platform can support the current load demand. This paper provides the logical next step where we extend our work by proposing an automated detection and diagnostic capability for the performance faults manifesting themselves in cloud and datacenter environments. This is a crucial task to maintain the smooth operation of running services and minimizing downtime. We demonstrate the effectiveness of our approach which exploits the interpretative capabilities of Self- Organizing Maps (SOMs) to automatically detect and localize different performance faults for cloud services.

  • 13.
    Ahrentorp, Fredrik
    et al.
    RISE., Swedish ICT, Acreo, Sensor Systems.
    Blomgrten, Jakob
    Coil comprising a winding comprising a multi-axial cable2011Patent (Annet (populærvitenskap, debatt, mm))
  • 14.
    Akbari, Saeed
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Kostov, Konstantin Stoychev
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Brinkfeldt, Klas
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Adolfsson, Erik
    RISE Research Institutes of Sweden, Material och produktion, Tillverkningsprocesser.
    Lim, Jang-Kwon
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Andersson, Dag
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Bakowski, Mietek
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Wang, Qin
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Salter, Michael
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Ceramic Additive Manufacturing Potential for Power Electronics Packaging2022Inngår i: IEEE Transactions on Components, Packaging, and Manufacturing Technology, ISSN 2156-3950, E-ISSN 2156-3985, Vol. 12, nr 11, s. 1857-1866Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Compared with silicon-based power devices, wide band gap (WBG) semiconductor devices operate at significantly higher power densities required in applications such as electric vehicles and more electric airplanes. This necessitates development of power electronics packages with enhanced thermal characteristics that fulfil the electrical insulation requirements. The present research investigates the feasibility of using ceramic additive manufacturing (AM), also known as three-dimensional (3D) printing, to address thermal and electrical requirements in packaging gallium nitride (GaN) based high-electron-mobility transistors (HEMTs). The goal is to exploit design freedom and manufacturing flexibility provided by ceramic AM to fabricate power device packages with a lower junction-to-ambient thermal resistance (<italic>R</italic>&#x03B8;JA). Ceramic AM also enables incorporation of intricate 3D features into the package structure in order to control the isolation distance between the package source and drain contact pads. Moreover, AM allows to fabricate different parts of the packaging assembly as a single structure to avoid high thermal resistance interfaces. For example, the ceramic package and the ceramic heatsink can be printed as a single part without any bonding layer. Thermal simulations under different thermal loading and cooling conditions show the improvement of thermal performance of the package fabricated by ceramic AM. If assisted by an efficient cooling strategy, the proposed package has the potential to reduce <italic>R</italic>&#x03B8;JA by up to 48%. The results of the preliminary efforts to fabricate the ceramic package by AM are presented, and the challenges that have to be overcome for further development of this manufacturing method are recognized and discussed. 

  • 15.
    Akbari, Saeed
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Sakhaei, A. H.
    University of Kent, UK.
    Panjwani, S.
    Singapore University of Technology and Design, Singapore.
    Kowsari, K.
    Singapore University of Technology and Design, Singapore.
    Ge, Q.
    Singapore University of Technology and Design, Singapore; Southern University of Science and Technology, China.
    Shape-reversible 4D printing aided by shape memory alloys2022Inngår i: Smart Materials in Additive Manufacturing, volume 2: 4D Printing Mechanics, Modeling, and Advanced Engineering Applications, Elsevier , 2022, s. 387-406Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    Four-dimensional (4D) printed structures fabricated from shape memory polymers (SMPs) are typically one-way actuators, that is, for each actuation cycle, they must be programmed to deform from the original (as-printed) shape to a secondary (programmed) shape. This is done by applying a combination of thermal and mechanical loads. Then, they restore the initial shape during the actuation process by applying a thermal load. Here, we generalize this concept to fabricate two-way actuators by embedding shape memory alloy (SMA) wires into the printed SMP structures. To explain this in greater detail, we describe the printing process of a two-way bending actuator whose bilayer hinges consist of stiff SMPs as well as elastomers with low modulus. Joule heating was employed to modulate the hinges bending stiffness. To this end, electrical current was applied to the resistive wires inserted into the hinges SMP layer to control their temperature. On the other hand, thermomechanical programming of the SMA wires, which were integrated into the actuator, provided the bending actuation force. The fabricated actuator was able to bend, maintain the deformed shape, and recover the as-fabricated shape in a fully automated manner. Further potentials of this design methodology were assessed using a nonlinear finite element model. The model incorporated user-defined subroutines to incorporate complex material behaviors of SMAs and SMPs. 

  • 16.
    Alavijeh, Nima Mirzaei
    et al.
    Chalmers University of Technology, Sweden.
    Song, Meng
    RISE Research Institutes of Sweden.
    Tobiasson, Wenche
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Steen, David
    Chalmers University of Technology, Sweden.
    Anh Tuan, Le
    Chalmers University of Technology, Sweden.
    A toolbox for comparing congestion management solutions for distribution networks2023Inngår i: 2023 IEEE Belgrade PowerTech, 2023Konferansepaper (Fagfellevurdert)
    Abstract [en]

    To address the emerging challenges in electricity distribution networks, various solutions have been proposed such as alternative tariff design, local flexibility markets (LFMs), bilateral contracts, and local energy markets (LEMs). However, choosing a suitable solution is not straightforward due to multi-dimensional complexity of the challenges which may vary under different circumstances. This paper proposes a toolbox for qualitative and quantitative comparison of the different solutions. The toolbox includes a multi-dimensional analytical framework and a flexible modeling and demonstration platform for conducting quantitative comparison studies. Four solutions i.e. LFM, LEM, cost-reflective tariffs, and bilateral contracts are compared qualitatively using the framework and a real demonstration example of an LFM design is presented utilizing the modeling platform. The toolbox can facilitate research on the local grid challenges and contribute to finding a suitable solution from a multi-dimensional perspective.

  • 17.
    Al-Awis, Suhail Najm
    et al.
    University of Technology, Iraq.
    Schatz, Richard
    KTH Royal Institute of Technology, Sweden.
    Pang, Xiaodan
    RISE., Swedish ICT, Acreo.
    Ozolins, Oskars
    RISE., Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Fattah, Ali Y.
    University of Technology, Iraq.
    Chen, Jiajia
    KTH Royal Institute of Technology, Sweden.
    Phenomenological Formula for Modelling of Physical Layer Impairments in Elastic Optical Networks2015Inngår i: Asia Communications and Photonics Conference 2015, 2015, artikkel-id ASu2A.75Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An empirical modelling technique is introduced to estimate impact of physical layer impairments in elastic optical networks, which can be used to evaluate transmission quality. The model has been verified experimentally with accuracy beyond (97.3%).

  • 18.
    Alexandersson, Martin
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Maritima avdelningen. Chalmers University of Technology, Sweden.
    Mao, Wengang
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas W
    Chalmers University of Technology, Sweden.
    System identification of Vessel Manoeuvring Models2022Inngår i: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 266, artikkel-id 112940Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Identifying the ship's maneuvering dynamics can build models for ship maneuverability predictions with a wide range of useful applications. A majority of the publications in this field are based on simulated data. In this paper model test data is used. The identification process can be decomposed into finding a suitable manoeuvring model for the hydrodynamic forces and to correctly handle errors from the measurement noise. A parameter estimation is proposed to identify the hydrodynamic derivatives. The most suitable manoeuvring model is found using the parameter estimation with cross-validation on a set of competing manoeuvring models. The parameter estimation uses inverse dynamics regression and Extended Kalman filter (EKF) with a Rauch Tung Striebel (RTS) smoother. Two case study vessels, wPCC and KVLCC2, with very different maneuverability characteristics are used to demonstrate and validate the proposed method. Turning circle predictions with the robust manoeuvring models, trained on zigzag model tests, show good agreement with the corresponding model test results for both ships. © 2022 The Author(s)

  • 19.
    Alfredsson, Hampus
    et al.
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Nyman, Joakim
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Nilsson, John
    Swedavia AB, Sweden.
    Staack, Ingo
    Linköping University, Sweden.
    Infrastructure modeling for large-scale introduction of electric aviation2022Inngår i: 35th International Electric Vehicle Symposium and Exhibition (EVS35), 2022Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents the results of the MODELflyg research project funded by the Swedish Transport Administration to gain more knowledge about ground charging infrastructure demand for the electrification of air traffic. An integrated simulation model was developed including flight traffic data processing, modelling of battery electric aircraft performance, and charging simulations. Several different options are available to select specific air traffic flows of interest, including scheduling algorithms for electric aviation adapted timetables. Furthermore, a smart-charging algorithm was developed to lower peak power demand at each airport from simultaneous charging of multiple electric aircraft.

    Fulltekst (pdf)
    fulltext
  • 20.
    Alikhanzadeh, Babak
    et al.
    Chalmers University of Technology, Sweden.
    Thiringer, Torbjörn
    Chalmers University of Technology, Sweden.
    Kharezy, Mohammad
    Optimum Leakage Inductance Determination for a Q2L-Operating MMC-DABwith Different Transformer Winding Configurations2019Inngår i: 2019 20th International Symposium on Power Electronics (Ee), 2019Konferansepaper (Fagfellevurdert)
    Abstract [sv]

    This paper discusses the procedure for the determination of the optimum leakage inductance of a medium frequency transformer (MFT) for a quasi-two-level (Q2L) operating three-phase modular multilevel converter dual-active bridge (MMC-DAB) considering the effects of the MFT winding configuration. Three different winding configurations-namely, Y-Y, D-D, and Y-D-are considered for the connection of the MFT windings. The optimum leakage inductance requirement of the MFT, the currents total harmonic distortion (THD), and the transformer utilization factor (TUF) are compared for the three winding configurations. It is found that the Y-Y and the D-D configurations have similar optimum leakage inductance patterns, which are different from the Y-D configuration. Furthermore, it is established that an optimized leakage inductance value for a conventional DAB, can be utilized for the Q2L-operating MMC-DAB for a wide range of transition time with the Y-Y and the D-D winding configurations if less than a 5% error could be tolerated in its value. A comparison with respect to the TUF and the currents THD revealed that the Y-Y and the D-D configurations result in a higher TUF compared to the Y-D configuration; However, the Y-D configuration has approximately two times lower currents THD compared to the other two configurations

  • 21.
    Alissa, S.
    et al.
    Swedish Mapping Cadastral and Land Registration Authority, Sweden.
    Håkansson, M.
    Swedish Mapping Cadastral and Land Registration Authority, Sweden.
    Henkel, P.
    ANavS GmbH, Germany.
    Mittmann, U.
    ANavS GmbH, Germany.
    Huffmeier, Johannes
    RISE Research Institutes of Sweden.
    Rylander, Robert
    RISE Research Institutes of Sweden, Säkerhet och transport, Säkerhetsforskning.
    Low bandwidth network-rtk correction dissemination for high accuracy maritime navigation2021Inngår i: TransNav, International Journal on Marine Navigation and Safety of Sea Transportation, ISSN 2083-6473, E-ISSN 2083-6481, Vol. 15, nr 1, s. 171-179Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    More than half of the incidents reported to EMSA relate to nautical events such as collision, groundings and contacts. Knowledge of accurate and high-integrity positioning is therefore not only a need for future automated shipping but a base for today’s safe navigation. Examples on accidents include Ever Given in the Suez Canal and HNoMS Helge Ingstad in Norway. A Network-RTK (NRTK) service can be used as an augmentation technique to improve performance of shipborne GNSS receivers for future positioning of manned and unmanned vessels in restricted areas, such as port areas, fairways, and inland water ways. NRTK service providers generate RTK corrections based on the observations of networks of GNSS reference stations which enables the users to determine their position with centimeter accuracy in real-time using a shipborne GNSS receiver. Selection of appropriate communication channels for dissemination of NRTK corrections data is the key to a secure positioning (localization) service. In PrePare-Ships project, the modern maritime communication system VDES (VHF Data Exchange System) is proposed to distribute SWEPOS (NRTK in Sweden) correction data to shipborne positioning modules. VDES is a very reliable technique and it is compatible with most onboard functionalities. In order to minimize the impact on the overall VDES data capacity in a local area, NRTK correction data shall only occupy a single VDES slot with a net capacity of 650 bytes. Update rates may vary but are preferably at 1Hz. However, NRTK correction data size changes instantly, depending on the number of visible GNSS satellites, and the data rate can therefore sometimes reach in excess of 1000 byte/s. In this study, a smart technique is proposed to reduce size of NRTK correction data to instantly adapt with the VDES requirements by choosing a combination of specific signals, satellites or even constellations such that the data rate is not more than 650 byte/s, and at the same time it achieves optimal positioning performance with the accuracy required by the PrePare-Ships project application. 

  • 22.
    Alissa, S.
    et al.
    Lantmäteriet, Sweden.
    Håkansson, M.
    Lantmäteriet, Sweden.
    Rieck, Carsten
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Dutta, Uttama
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Nord, Stefan
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Bergljung, P.
    Saab TransponderTech, Sweden.
    Bagge, A.
    Saab TransponderTech, Sweden.
    Distribution of the adapted-NRTK correction data via VDES for the shipping navigation safety2021Inngår i: Proceedings of the 34th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2021, Institute of Navigation , 2021, s. 521-534Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this study the maritime communication system VDES (VHF Data Exchange System) is proposed to distribute Network-RTK (NRTK) correction data to shipborne GNSS receivers in fairways, port areas, or inland water ways. The transport layer used for transmission of VDES messages (related to the standard IEC61162-450) is the UDP multicast protocol. This makes it possible to transmit the RTCM packages from the VDES transponder to the shipborne GNSS receivers as a UDP payload without any additional formatting. In order to minimize the impact on the overall VDES data capacity in a local service area, NRTK correction data shall at most occupy a single VDES slot with a net capacity of 650 bytes denoted Link ID 19. This is the fastest link in VDES. Update rates may vary but are preferably at 1Hz. However, depending on the number of visible satellites NRTK correction data size changes instantly and the data rate can therefore sometimes be in excess of 1000 byte/s per reference station to be distributed. In order to comply with the VDES requirements, the Lantmäteriet Adjustment Solution (LAS) for GNSS correction data adjustment was developed and is presented in this paper. The responsibility of this solution is to produce a correction data stream that complies with the bandwidth limitation of 650 bytes/s. To provide corrections for a potentially large number of users, dissemination is done by broadcasting corrections for a grid of VRSs. The proposed solution has therefore also the capability to combine several correction data streams from several Virtual Reference Stations (VRSs) into one single correction data stream. To reduce the required data rate, the LAS has the ability to filter streamed GNSS correction data in the RTCM3 MSM format constellation-wise, satellite-wise, and signal-wise. The objective is to achieve optimal performance in terms of accuracy for the ship's differential positioning solution, while at the same time adhering to constraints that might locally apply for individual transmitters. For this paper LAS was configured to interface with the SWEPOS to provide reference data to static and kinematic testing scenarios. The results presented here were obtained using RTK post-processing with RTKLib for a combination of GPS and Galileo multi-frequency observations. Results indicated that LAS solution can achieve robust positioning performance with decimeter-level accuracy which meet the requirements expected for the navigation safety at Sea. Adapted-NRTK correction data (LAS data) via VDES has the potential to be part of a world-wide standard VDES application for all vessels sailing under SOLAS and for ships that voluntarily uses VDES in the near future (inland, yachts, navies, leisure).

  • 23.
    Alklind Taylor, Anna-Sofia
    et al.
    University of Skövde, Sweden.
    Nalin, Kajsa
    University of Skövde, Sweden.
    Holgersson, Jesper
    University of Skövde, Sweden.
    Gising, Andreas
    RISE Research Institutes of Sweden.
    Ferwerda, Bruce
    Jönköping university, Sweden.
    Chen, Lei
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Guardian Angel: Using Lighting Drones to Improve Traffic Safety, Sense of Security, and Comfort for Cyclists2023Inngår i: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)Volume 14057 LNCS, Pages 209 - 223, Springer Science and Business Media Deutschland GmbH , 2023, Vol. 14057 LNCS, s. 209-223Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Active mobility, such as biking, faces a common challenge in Swedish municipalities due to the lack of adequate lighting during the dark winter months. Insufficient lighting infrastructure hinders individuals from choosing bicycles, despite the presence of well-maintained bike paths and a willingness to cycle. To address this issue, a project has been undertaken in the Swedish municipality of Skara for an alternative lighting solution using drones. A series of tests have been conducted based on drone prototypes developed for the selected bike paths. Participants were invited to cycle in darkness illuminated by drone lighting and share their mobility preferences and perception. This paper summarizes the users’ perception of drone lighting as an alternative to fixed lighting on bike paths, with a special focus on the impact on travel habits and the perceived sense of security and comfort. Most participants were regular cyclists who cited bad weather, time, and darkness as significant factors that deterred them from using bicycles more frequently, reducing their sense of security. With drone lighting, the participants appreciated the illumination’s moonlight-like quality and its ability to enhance their sense of security by illuminating the surroundings. On the technology side, they gave feedback on reducing the drone’s sound and addressing lighting stability issues. In summary, the test results showcase the potential of drone lighting as a viable alternative to traditional fixed lighting infrastructure, offering improved traffic safety, sense of security, and comfort. The results show the feasibility and effectiveness of this innovative approach, supporting transformation towards active and sustainable mobility, particularly in regions facing lighting challenges.

  • 24.
    Allison, R.S.
    et al.
    York University, Canada.
    Brunnström, Kjell
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Chandler, D.M.
    Shizuoka University, Japan.
    Colett, H.
    Intel Corp, USA.
    Corriveau, P.
    Intel Corp, USA.
    Daly, S.
    Dolby Laboratories Inc, USA.
    Goel, J.
    Qualcomm Technologies, USA.
    Long, J.Y.
    Intel Corp, USA.
    Wilcox, L.M.
    York University, Canada.
    Yaacob, Y.
    Shizuoka University, Japan.
    Yang, S. N.
    Pacific University, USA.
    Zhang, Y.
    Xi’an Jiaotong University, China.
    Perspectives on the definition of visually lossless quality for mobile and large format displays2018Inngår i: Journal of Electronic Imaging, ISSN 10179909, Vol. 27, nr 5, artikkel-id 053035Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Advances in imaging and display engineering have given rise to new and improved image and videoapplications that aim to maximize visual quality under given resource constraints (e.g., power, bandwidth).Because the human visual system is an imperfect sensor, the images/videos can be represented in a mathematicallylossy fashion but with enough fidelity that the losses are visually imperceptible—commonly termed“visually lossless.” Although a great deal of research has focused on gaining a better understanding ofthe limits of human vision when viewing natural images/video, a universally or even largely accepted definitionof visually lossless remains elusive. Differences in testing methodologies, research objectives, and targetapplications have led to multiple ad-hoc definitions that are often difficult to compare to or otherwise employ inother settings. We present a compendium of technical experiments relating to both vision science and visualquality testing that together explore the research and business perspectives of visually lossless image quality,as well as review recent scientific advances. Together, the studies presented in this paper suggest that a singledefinition of visually lossless quality might not be appropriate; rather, a better goal would be to establish varyinglevels of visually lossless quality that can be quantified in terms of the testing paradigm.

    Fulltekst (pdf)
    fulltext
  • 25.
    Amores, Santiago Gallego
    et al.
    i-DE (Iberdrola), Spain.
    Hillberg, Emil
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Iliceto, Antonio
    ETIP SNET, Italy.
    Mataczyńska, Ewa
    Institute for Energy Policy, Poland.
    Ilo, Albana
    TU Wien, Austria.
    How can flexibility support power grid resilience through the next level of flexibility and alternative grid developments2023Inngår i: 27th International Conference on Electricity Distribution (CIRED 2023), Institute of Electrical and Electronics Engineers (IEEE), 2023, s. 1842-1846Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Power system resilience is an overarching concept covering the whole spectrum of the power system, from design and investment decisions to planning, operations, maintenance and asset management functions. Flexibility concerns the power system's ability to manage changes, with flexibility features able to improve the resilience characteristics of the system, provided that they are integrated into grid planning, in defence plans, and evaluated adequately in the energy market design. An analysis of ongoing worldwide initiatives provides relevant insight into ongoing worldwide initiatives. They provide relevant insight into how flexibility can support resilience, showing the prominence and potential values that can be unlocked, with potentially some low-hanging fruits to start. This paper introduces four innovative concepts: Alternative grid development, system integrity protection schemes, the next level of flexibility and LINK holistic approach to flexibility for resilience as solutions contributing to improving future power systems' resilience.

  • 26.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Doran, N. J.
    Chalmers University of Technology, Sweden.
    Forysiak, W.
    Chalmers University of Technology, Sweden.
    Nijhof, J. H. B.
    Chalmers University of Technology, Sweden.
    Power dependence and accessible bandwidth for dispersion-managed solitons in asymmetric dispersion maps1998Rapport (Annet vitenskapelig)
    Abstract [en]

    We investigate how the parameters of dispersion managed solitons depend on the asymmetry of the dispersion map. Using the variational approach and numerical simulations we show that asymmetric maps can increase the accessible bandwidth in the normal average dispersion regime and equalise the power in adjacent WDM channels.

  • 27.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Doran, N. J.
    Aston University, UK.
    Forysiak, W.
    Aston University, UK.
    Nijhof, J. H. B.
    Aston University, UK.
    Power dependence and accessible bandwidth for dispersion-managed solitons in asymmetric dispersion maps1998Inngår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 34, nr 21, s. 2054-2056Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The authors investigate how the parameters of dispersion managed solitons depend on the asymmetry of the dispersion map. Using the variational approach and numerical simulations it is shown that asymmetric maps can increase the accessible bandwidth in the normal average dispersion regime and equalise the power in adjacent WDM channels.

  • 28.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Quiroga-Teixeiro, M. L.
    Chalmers University of Technology, Sweden.
    Karlsson, M.
    Chalmers University of Technology, Sweden.
    Self-phase modulation in dispersion compensated optical fibre transmission systems1996Inngår i: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 130, nr 1-3, s. 153-162Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An analysis is made of the influence of self-phase modulation on optical fibre communication systems where the chromatic dispersion is compensated for by a dispersion compensation fibre. In particular we derive a simple and useful expression for the optimal fibre length in the presence of nonlinearities.

  • 29.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, Dan
    Chalmers University of Technology, Sweden.
    Lisak, Mietek
    Chalmers University of Technology, Sweden.
    Quiroga-Teixeiro, Manuel L.
    Chalmers University of Technology, Sweden.
    Karlsson, Magnus
    Chalmers University of Technology, Sweden.
    Self-phase modulation in dispersion compensated optical fibre transmission systems1998Rapport (Annet vitenskapelig)
    Abstract [en]

    An analysis is made of the influence of self-phase modulation on optical fibre communication systems where the chromatic dispersion is compensated for by a dispersion compensation fibre. In particular we derive a simple and useful expression for the optimal fibre length in the presence of nonlinearities.

  • 30.
    Anders, Berntson
    et al.
    Chalmers Univ of Technology, Sweden.
    Anderson, Dan
    Chalmers Univ of Technology, Sweden.
    Lisak, Mietek
    Chalmers Univ of Technology, Sweden.
    Teixeiro, Manuel L.Quiroga
    Chalmers Univ of Technology, Sweden.
    Karlsson, Magnus
    Chalmers Univ of Technology, Sweden.
    Self-phase modulation in dispersion-compensating systems1996Inngår i: Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, IEEE , 1996, s. 405-406Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The effects of SPM in a dispersion-compensation system are investigated. An explicit and compact formula is presented for the optimal length of the DCF. In particular, it is shown that the order of the fibers is important when SPM is considered. Using precompensation SPM effects can improve system performance. A qualitative comparison between the analytical predictions and previously presented experimental results show good agreement.

  • 31.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Malomed, B. A.
    Tel Aviv University, Israel.
    Dispersion management with filtering1999Inngår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 24, nr 8, s. 507-509Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    With regards to their potential to improving the pulse-based regimes in optical communication networks, dispersion-managed solitons in a fiber link including guiding filters and compensating gain were investigated. Combining the variational approximation and the perturbative treatment of the filtering and gain, stationary regimes are predicted. Among other features, the minimum map strength necessary for the existence of the pulses when path-averaged dispersion (PAD) is zero or normal is absent, rather, a minimum necessary normalized power for any PAD exists.

  • 32.
    Anders, Berntson
    et al.
    Ericsson Telecom, Sweden.
    Martensson, J.
    Ericsson Telecom, Sweden.
    Westlund, M.
    Ericsson Telecom, Sweden.
    Influence of pulse width and dispersion period on 40 Gbit/s dispersion-managed RZ transmission2000Inngår i: Conference on Lasers and Electro-Optics (CLEO 2000)Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An overview is given on the numerical investigation of the influence of the dispersion period and the pulse width on the performance of a dispersion-managed (DM) transmission link. Results from studying a transmission link of alternating pieces of standard fiber (SF) and dispersion compensating fiber (DCF) are discussed.

  • 33.
    Anders, Berntson
    et al.
    Ericsson Telecom AB, Sweden.
    Popov, S.
    Ericsson Telecom AB, Sweden.
    Vanin, E.
    Ericsson Telecom AB, Sweden.
    Jacobsen, G.
    Ericsson Telecom AB, Sweden.
    Karlsson, J.
    Ericsson Telecom AB, Sweden.
    Polarisation dependence and gain tilt of Raman amplifiers for WDM systems2001Inngår i: Conference on Optical Fiber Communication, Technical Digest Series, 2001, nr 1, s. MI2/1-MI2/3Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We investigate the polarisation dependence and gain tilt of Raman amplifiers for WDM systems. We find no polarisation dependence of the gain for backward propagating pumps. Results from experiments on commercial 32-channel WDM system are presented, highlighting the effect of gain tilt and pump depletion.

  • 34.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Brinkfeldt, Klas
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Nord, Stefan
    Volvo Group Trucks Technology, Sweden.
    Ottosson, Jonas
    Volvo Group Trucks Technology, Sweden.
    Lampic, Gorazd
    Elaphe Propulsion Technologies Ltd, Slovenia.
    Gotovac, Gorazd
    Elaphe Propulsion Technologies Ltd, Slovenia.
    Zschieschang, Olaf
    Fairchild Semiconductor GmbH, Germany.
    Baumgartel, Hauke
    Hella Fahrzeugkomponenten GmbH, Germany.
    Brusius, Matthias
    Sensitec GmbH, Germany.
    Kaulfersch, Eberhard
    Berliner Nanotest und Design GmbH, Germany.
    Hilpert, Florian
    Fraunhofer IISB, Germany.
    Otto, Alexander
    Fraunhofer ENAS, Germany.
    Frankeser, Sophia
    Chemnitz University of Technology, Germany.
    COSIVU - Compact, smart and reliable drive unit for fully electric vehicles2016Inngår i: 2016 Pan Pacific Microelectronics Symposium (Pan Pacific), Institute of Electrical and Electronics Engineers Inc. , 2016, artikkel-id 7428413Konferansepaper (Fagfellevurdert)
    Abstract [en]

    COSIVU is a three year collaborative research project that ended in September 2015 and which has been funded within the European Green Car Initiative (now the European Green Vehicle Initiative). COSIVU addresses one of the most critical technical parts in fully electrical vehicles (FEV) besides the energy storage system: the mechatronic drive-train unit. The COSIVU project has delivered a new system architecture for multiple wheel drive-trains by a smart, compact and durable single-wheel drive unit with integrated electric motor, full silicon carbide (SiC) power electronics (switches and diodes), a novel control and health monitoring module with wireless communication, and an advanced ultra-compact cooling solution. DfR utilizing FEM simulations ensures first time right solutions. This paper presents the main results including the architecture of the drive train solution as well as the modular design of the inverter based on Inverter Building Blocks, one per phase. Performance tests are presented here for the first time for both the heavy duty commercial vehicle solution performed in a test rig by Volvo, and the tests of the COSIVU solution adapted to a passenger car done by Elaphe.

  • 35.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Wetter, Göran
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Interconnection of electrically conductive fibersfor application in smart textiles2015Konferansepaper (Annet vitenskapelig)
  • 36.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Weiler, Petra
    VDI/VDE Innovation + Technik GmbH, Germany.
    Mayora, Kepa
    IK4-Ikerlan, Spain.
    Kunze, Michael
    Hahn Schickard, Germany.
    Günzler, Rainer
    Hahn Schickard, Germany.
    Karmann, Stephan
    Hahn Schickard, Germany.
    Steinke, Arndt
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Winzer, Andreas
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Thronicke, Nicole
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Vazquez, Patricia
    Tyndall Institute, Ireland.
    Felemban, Shifa
    Tyndall Institute, Ireland.
    Moore, Eric
    Tyndall Institute, Ireland.
    Voirin, Guy
    CSEM SA, Switzerland.
    Scolan, Emmanuel
    CSEM SA, Switzerland.
    Smadja, Rita
    CSEM SA, Switzerland.
    SMARTER-SI - Smart access to manufacturing for Systems Integration2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The three year EU project SMARTER-SI that started in February 2015 has developed and tested a new production platform for smart systems that offer SMEs and “mid-cap” companies help to manufacture small and medium volumes. The ultimate goal of this project is to test a new concept for small lot production, which we call the Cooperative Foundry Model (CFM). The CFM is tested by combining components or parts of systems (building blocks) already developed by the RTOs involved in the project in so-called Application Experiments (AEs), thereby creating innovative Smart Systems which serve SMEs' product needs. During the first two years, four predefined AEs have been developed that consist of i) a multi-parametric point of care testing (POCT) device, ii) a dew-point measurement system, iii) a CO2 measurement system, and iv) a portable device that can be used to screen water quality.

  • 37.
    Andersson Ersman, Peter
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Freitag, Kathrin
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Kawahara, Jun
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara. Lintec Corporation, Japan.
    Åhlin, Jessica
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    The rise of electrochromics through dynamic QR codes and grayscale images in screen printed passive matrix addressed displays2022Inngår i: Scientific Reports, E-ISSN 2045-2322, Vol. 12, nr 1, artikkel-id 10959Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Electronic matrix addressed displays capable of presenting arbitrary grayscale images typically require complex device architectures including switching components to provide unique pixel addressability. Here, we demonstrate high-yield manufacturing of passive matrix addressed electrochromic displays on flexible substrates by solely using screen printing. The simple pixel architecture, obtained by printing only three active layers on top of each other, concurrently provides both the electrochromic functionality and the critical non-linear pixel switching response that enables presentation of arbitrary grayscale images in the resulting passive matrix addressed displays. The all-printed display technology exhibits unprecedented performance and is further verified by dynamic QR codes, to exemplify utilization within authentication, packaging, or other emerging Internet of Things applications requiring a low-cost display for data visualization. © 2022, The Author(s).

  • 38.
    Andersson Ersman, Peter
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Freitag, Kathrin
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Nilsson, Marie
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Åhlin, Jessica
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Brooke, Robert
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Nordgren, Niklas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Aulin, Christian
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Fall, Andreas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Nevo, Yuval
    Melodea Ltd, Israel.
    Beni, Valerio
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Electrochromic Displays Screen Printed on Transparent Nanocellulose-Based Substrates2023Inngår i: Advanced Photonics Research, ISSN 2699-9293, artikkel-id 2200012Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Manufacturing of electronic devices via printing techniques is often considered to be an environmentally friendly approach, partially due to the efficient utilization of materials. Traditionally, printed electronic components (e.g., sensors, transistors, and displays) are relying on flexible substrates based on plastic materials; this is especially true in electronic display applications where, most of the times, a transparent carrier is required in order to enable presentation of the display content. However, plastic-based substrates are often ruled out in end user scenarios striving toward sustainability. Paper substrates based on ordinary cellulose fibers can potentially replace plastic substrates, but the opaqueness limits the range of applications where they can be used. Herein, electrochromic displays that are manufactured, via screen printing, directly on state-of-the-art fully transparent substrates based on nanocellulose are presented. Several different nanocellulose-based substrates, based on either nanofibrillated or nanocrystalline cellulose, are manufactured and evaluated as substrates for the manufacturing of electrochromic displays, and the optical and electrical switching performances of the resulting display devices are reported and compared. The reported devices do not require the use of metals and/or transparent conductive oxides, thereby providing a sustainable all-printed electrochromic display technology.

  • 39.
    Andersson Ersman, Peter
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Åhlin, Jessica
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Westerberg, David
    RISE Research Institutes of Sweden.
    Sawatdee, Anurak
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Arvén, Patrik
    J2 Holding AB, Sweden.
    Ludvigsson, Mikael
    RISE Research Institutes of Sweden, Samhällsbyggnad, Bygg och fastighet.
    Batteryless Electronic System Printed on Glass Substrate2021Inngår i: Electronic Materials, E-ISSN 2673-3978, Vol. 2, nr 4Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Batteryless hybrid printed electronic systems manufactured on glass substrates are reported. The electronic system contains a sensor capable of detecting water, an electrochromic display, conductors, a silicon chip providing the power supply through energy harvesting of electromagnetic radiation, and a silicon-based microcontroller responsible for monitoring the sensor status and the subsequent update of the corresponding display segment. The silicon-based components were assembled on the glass substrate by using a pick and place equipment, while the remainder of the system was manufactured by screen printing. Many printed electronic components, often relying on organic materials, are sensitive to variations in environmental conditions, and the reported system paves the way for the creation of electronic sensor platforms on glass substrates for utilization in see-through applications in harsh conditions. Additionally, this generic hybrid printed electronic sensor system also demonstrates the ability to enable autonomous operation through energy harvesting in future smart window applications.

  • 40.
    Andersson, G
    et al.
    RISE., Swedish ICT, Acreo, Sensor Systems.
    Winkler, D
    Mikrosystem – möjligheternas teknik: Om klassificering, metoder och tillämpning2000Bok (Annet vitenskapelig)
    Abstract [sv]

    Mikrosystem är ett mycket expansivt område som erbjuder stora möjligheter till effektivisering och miniatyrisering av komplexa produkter. Nya unika egenskaper i samverkan med låga tillverkningskostnader har medfört att mikrosystemtekniken, MST, Microsystems Technology, erövrar såväl existerande produktområden som helt nya, t ex: bilar, flygplan medicinsk teknik, mindetektorer, rymdindustri m fl.

    Denna bok presenterar mikrosystemen och deras möjligheter. Den inleds med en unik marknadsöversikt där olika tillämpningsområdens utveckling och framtid diskuteras. En detaljrik framställning och klassificering av etablerade och kommande mikrosystem bildar en bred kunskapsbank för såväl specialister som oinvigda inom området. För konstruktörer som t ex vill öka sin kunskap om olika kategorier av sensorer förklaras begrepp och funktionsprinciper på ett utförligt sätt. Boken är även en lämplig introduktion till sensorer och mikromekanik på landets alla olika ingenjörsutbildningar.

  • 41.
    Andersson, GI
    RISE., Swedish ICT, Acreo, Sensor Systems.
    A novel 3-axis monolithic silicon accelerometer1995Inngår i: Digest of Techn. Papers, The 8th Int. Conf. on Solid-State Sensors and Actuators, Transducers ‘95/ Eurosensors IX), Volume II, pp. 558-561., 1995Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Working prototypes of a novel 3 axis monolithic silicon accelerometer have been manufactured at Chalmers University of Technology in co operation with Saab Combitech AB and the Department of Solid State Electronics. Experience from the prototypes is most encouraging as they have confirmed the theoretical predictions of negligible cross-axis sensitivity. The accuracy in the separation of an arbitrary directed acceleration into acceleration vectors in a Cartesian system of coordinates has shown to be high almost beyond expectation. The accelerometer has good potential to develop into a low cost 3 axis accelerometer in the 0 2 g range with a resolution of about 10 mg. This in part due to the simple manufacturing process.

  • 42.
    Andersson, Kristina
    et al.
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Burden, Håkan
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Amanuel, Mahdere DW
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Stenberg, Susanne
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Thidevall, Niklas
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Fordonsdata till allmänhetens nytta - geofencing och affärsmodeller2021Rapport (Annet vitenskapelig)
    Abstract [sv]

    Fordonsdata kan i framtiden vara till stor nytta för myndigheter på olika sätt. Än så länge samlar myndigheter in fordonsdata i begränsad omfattning. Det kan t.ex. handla om att genom offentlig upphandling pröva nya sätt för att kontrollera kvaliteten på utförd snöröjning. Trots att det finns ett intresse från både privata och offentliga aktörer att genomföra affärer kring fordonsdata är det ändå svårt för marknaden att ta fart. 

    Frågan om hur fordonsdata kan kommersialiseras med offentliga aktörer som köpare har därför undersökts inom Drive Sweden Policy Lab i samarbete med CeViss-projektet (Cloud enhanced cooperative traffic safety using vehicle sensor data). CeViss-projektet har undersökt smarta kameror och hur de bl.a. kan användas för att varna andra förare för vilda djur vid vägen eller informera SOS Alarm om hur det ser ut vid en olycksplats. 

    Förutsättningarna för lyckad kommersialisering kan sammanfattas under tre rubriker - affären, tekniken och juridiken. Vi ser att affären ligger i förmåga att erbjuda aggregerade data där olika datamängder korsbefruktas och därmed skapar ett större värde än de ingående datamängderna besitter var för sig. Kommersiella aktörer pekar på att rollen att aggregera data, eller förädla den, är mest intressant, eftersom det innebär en möjlighet att utveckla tjänster. En sådan tjänst förutsätter tillgång till en säker uppkoppling och överföring. Det är också resurskrävande att förädla data och styra rätt överföring, liksom att se över, anpassa och ta fram avtal som gör korsbefruktning av data och överföring av rätt data juridiskt möjlig. Här spelar individens integritet kontra samhällets behov av data en stor roll. Det är inte heller klart vilket behov aktörer inom olika samhällssektorer har av fordonsdata, samt hur dessa kommer att få tag i fordonsdata. 

    Utmaningen för industrin ligger i att våga lita på att det finns en hållbar affär med myndigheten i längden, dvs. att det finns en tillräckligt stor betalningsvilja från samhällets sida även när data anses samhällskritisk viktigt. För att främja kommersialisering är det bra att börja med ett specifikt utvalt område för att utarbeta processer, avtal, tekniklösningar, affärs-modeller och så vidare. 

    Geofencing hade kunnat vara en möjlighet att skapa de avgränsningar som behövs för en första affär, samtidigt som det skulle skapa tydlighet om var och när data samlas in från fordon. En sådan avgränsning hade också kunnat tjäna som en regulatorisk sandlåda för att utvärdera möjligheten till avtal som är hållbara över tid, det vill säga där det är rimligt att inom vissa gränser använda data på nya sätt eller för nya syften. 

    Rapporten avslutas med en sammanställning av geofencing och datadelning ur ett juridiskt perspektiv samt en beskrivning av Drive Sweden Policy Lab. 

    Fulltekst (pdf)
    fulltext
  • 43. Andersson, L. I.
    et al.
    Hedekvist, P. O.
    Rudberg, B. G. R.
    Djupsjöbacka, Anders
    Ericsson, Sweden.
    Andrekson, P. A.
    10 Gb/s Optical Transmission using a Silicon Bipolar Chipset1995Inngår i: IEEE/LEOS 1995 Digest of the LEOS Summer Topical Meetings. Flat Panel Display Technology, 1995, s. 59-60Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A 10 Gb/s silicon chip set including a 8:1 MUX, a 1.8 DMUX, a dynamic divider, and circuits for clock recovery is described. Results from optical transmission experiments utilizing dispersion compensation techniques such as prechirp and MSSI, and bridging distances from 50 to 100 km, will be presented.

  • 44.
    Andreou, Andreas S.
    et al.
    Cyprus University of Technology, Cyprus.
    Papatheocharous, Efi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Automatic matching of software component requirements using semi-formal specifications and a CBSE ontology2015Inngår i: 2015 International Conference on Evaluation of Novel Approaches to Software Engineering (ENASE), 2015, s. 118-128Konferansepaper (Fagfellevurdert)
    Abstract [en]

    One of the most significant tasks of component-based software development is concerned with finding suitable components for integration. This paper introduces a novel development framework that promotes reusability and focuses on assessing the suitability level of candidate components. A specifications profile is first created using a semi-formal natural language that describes the desired functional and non-functional properties of the component(s) sought. A parser automatically recognizes parts of the profile and translates them into instance values of a dedicated CBSE ontology, the latter addressing issues of components' reusability. Available components on the market are also stored as instances of the CBSE ontology. Matching between required and offered component properties takes place automatically at the level of the ontology items and a suitability ratio is calculated that suggests which components to consider for integration.

  • 45.
    Andrén, Börje
    et al.
    RISE., Swedish ICT, Acreo, Broadband Technology.
    Wang, K
    RISE., Swedish ICT, Acreo, Broadband Technology.
    Brunnström, Kjell
    RISE., Swedish ICT, Acreo, Broadband Technology.
    Rydell, N
    Fuller, S
    A comparison of visual ergonomic measurements between active and passive 3DTV2011Inngår i: EURODISPLAY 2011, 2011Konferansepaper (Fagfellevurdert)
  • 46.
    Andrén, Börje
    et al.
    RISE., Swedish ICT, Acreo.
    Wang, Kun
    RISE., Swedish ICT, Acreo.
    Brunnström, Kjell
    RISE., Swedish ICT, Acreo.
    Characterizations of 3D TV: Active vs passive2012Konferansepaper (Fagfellevurdert)
  • 47.
    Aragon, Santiago
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS. Technische Universität Darmstadt, Germany.
    Tiloca, Marco
    RISE - Research Institutes of Sweden, ICT, SICS.
    Maass, Max
    Technische Universität Darmstadt, Germany.
    Hollick, Matthias
    Technische Universität Darmstadt, Germany.
    Raza, Shahid
    RISE - Research Institutes of Sweden, ICT, SICS.
    ACE of Spades in the IoT Security Game: A Flexible IPsec Security Profile for Access Control2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Authentication and Authorization for ConstrainedEnvironments (ACE) framework provides fine-grainedaccess control in the Internet of Things, where devices areresource-constrained and with limited connectivity. The ACEframework defines separate profiles to specify how exactlyentities interact and what security and communication protocolsto use. This paper presents the novel ACE IPsec profile, whichspecifies how a client establishes a secure IPsec channel witha resource server, contextually using the ACE framework toenforce authorized access to remote resources. The profilemakes it possible to establish IPsec Security Associations, eitherthrough their direct provisioning or through the standardIKEv2 protocol. We provide the first Open Source implementationof the ACE IPsec profile for the Contiki OS and testit on the resource-constrained Zolertia Firefly platform. Ourexperimental performance evaluation confirms that the IPsecprofile and its operating modes are affordable and deployablealso on constrained IoT platforms.

    Fulltekst (pdf)
    fulltext
  • 48.
    Aramrattana, Maytheewat
    et al.
    VTI Swedish National Road and Transport Research Institute, Sweden.
    Habibovic, Azra
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Englund, Cristofer
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system. Halmstad University, Sweden.
    Safety and experience of other drivers while interacting with automated vehicle platoons2021Inngår i: Transportation Research Interdisciplinary Perspectives, ISSN 2590-1982, Vol. 10, artikkel-id 100381Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It is currently unknown how automated vehicle platoons will be perceived by other road users in their vicinity. This study explores how drivers of manually operated passenger cars interact with automated passenger car platoons while merging onto a highway, and how different inter-vehicular gaps between the platooning vehicles affect their experience and safety. The study was conducted in a driving simulator and involved 16 drivers of manually operated cars. Our results show that the drivers found the interactions mentally demanding, unsafe, and uncomfortable. They commonly expected that the platoon would adapt its behavior to accommodate a smooth merge. They also expressed a need for additional information about the platoon to easier anticipate its behavior and avoid cutting-in. This was, however, affected by the gap size; larger gaps (30 and 42.5 m) yielded better experience, more frequent cut-ins, and less crashes than the shorter gaps (15 and 22.5 m). A conclusion is that a short gap as well as external human–machine interfaces (eHMI) might be used to communicate the platoon's intent to “stay together”, which in turn might prevent drivers from cutting-in. On the contrary, if the goal is to facilitate frequent, safe, and pleasant cut-ins, gaps larger than 22.5 m may be suitable. To thoroughly inform such design trade-offs, we urge for more research on this topic. © 2021 The Author(s)

  • 49.
    Aramrattana, Maytheewat
    et al.
    Halmstad University, Sweden.
    Larsson, Tony
    Halmstad University, Sweden.
    Jansson, Jonas
    VTI, Sweden.
    Englund, Cristofer
    RISE., Swedish ICT, Viktoria.
    Dimensions of Cooperative Driving, ITS and Automation2015Inngår i: Intelligent Vehicles Symposium (IV), 2015Konferansepaper (Annet vitenskapelig)
  • 50.
    Arvidsson, Moa
    et al.
    Halmstad University, Sweden.
    Sawirot, S.
    Halmstad University, Sweden.
    Englund, Cristofer
    Halmstad University, Sweden.
    Alonso-Fernandez, Fernando
    Halmstad University, Sweden.
    Torstensson, Martin
    RISE Research Institutes of Sweden, Digitala system, Mobilitet och system.
    Duran, Boris
    RISE Research Institutes of Sweden.
    Drone Navigation and License Place Detection for Vehicle Location in Indoor Spaces2024Inngår i: Lect. Notes Comput. Sci., Springer Science and Business Media Deutschland GmbH , 2024, s. 362-374Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Millions of vehicles are transported every year, tightly parked in vessels or boats. To reduce the risks of associated safety issues like fires, knowing the location of vehicles is essential, since different vehicles may need different mitigation measures, e.g. electric cars. This work is aimed at creating a solution based on a nano-drone that navigates across rows of parked vehicles and detects their license plates. We do so via a wall-following algorithm, and a CNN trained to detect license plates. All computations are done in real-time on the drone, which just sends position and detected images that allow the creation of a 2D map with the position of the plates. Our solution is capable of reading all plates across eight test cases (with several rows of plates, different drone speeds, or low light) by aggregation of measurements across several drone journeys. 

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