Endre søk
Begrens søket
1234567 51 - 100 of 568
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 51.
    Cao, Jin
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    OPERATING SYSTEM SECURITYMODELING: An Experimental Study on the CySeMoL model2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In this Master Thesis, several common applications and Windows operating systemservices are modeled within the field of information security. This thesis focuses onapplying the Enterprise Architecture Analysis Tool (EAAT) and the Cyber SecurityModeling Language (CySeMoL), which are developed by the Department of IndustrialInformation and Control System (ICS) at KTH. The overall objective of this study is todetermine the probability of the CySeMol model with a particular kind of attack. Theproject models six common applications on Windows platform and two Windowsoperating system services. The detailed information regarding the applications and defensemechanism are acquired from various sources. A few experiments have been carried out tovalidate the correctness of the predicted probabilities calculated by the CySeMoL. Theresults of the analysis suggest that the CySeMoL model has a good performance onoperating system vulnerability prediction. At last, some possible suggestions in the contextof the CySeMoL model are given.

    Fulltekst (pdf)
    fulltext
  • 52.
    Castillo, Felipe
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    An assessmant of the IT governance maturity at SL2011Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Today Information Technology (IT) can be found in every modern enterprise. As IT has

    become one of the most crucial parts of an enterprise, it has made management aware of the significant

    impact IT has on the success of the enterprise. This has led to a significant increase on IT investments. IT

    governance aims at assuring that IT delivers more value from IT investments and enforcing IT’s role as a

    business enabler.

     

    This master thesis aims at assessing the IT organization at AB Storstockholms Lokaltrafik (SL) from an IT

    governance perspective. The purpose of such assessment is to identify problem areas and suggest measures

    for improvement. The IT governance framework COBIT (Control Objectives for Information and related

    Technology) has guided the theory for IT governance throughout this study. A framework for the

    assessment of the IT governance maturity at SL was developed based on the IT Organization Model

    Assessment Tool (ITOMAT), a formalized method for assessing the IT governance maturity.

     

    The IT governance maturity of SL obtained the score 2,68 out of 5,00. Considering the fact that SL started

    with the process of introducing IT governance to the organization as recent as 3 years ago, the result

    obtained is considered high. It indicates that significant progress has been achieved in their IT governance.

    Nevertheless, the organization still has significant potential for improvement.

    Fulltekst (pdf)
    fulltext
  • 53.
    Cegrell, Torsten
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Björkman, Gunnar
    Protection against high impact, low frequency attacks on power system control2010Artikkel i tidsskrift (Annet vitenskapelig)
  • 54.
    Cegrell, Torsten
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Forsgren, Patrik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Management of Enterprise Information Systems for Power System Control and Operation2002Inngår i: IEE, The Fifth International Conference on Power System Management and Control, 2002Konferansepaper (Fagfellevurdert)
  • 55.
    Cha, Cha, Seung-Tae
    et al.
    Technical University of Denmark.
    Wu, Qiuwei
    Technical University of Denmark.
    Saleem, Arshad
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Østergaard, Jacob
    Technical University of Denmark (DTU), Denmark .
    Ding, Yi
    Technical University of Denmark.
    Modeling and Control for Islanding Operation of Active Distribution Systems2012Inngår i: Modeling and Control of Sustainable Power Systems: Towards Smarter and Greener Electric Grids / [ed] Wang, Lingfeng, Springer Berlin/Heidelberg, 2012, s. 83-125Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    Along with the increasing penetration of distributed generation (DG) in distribution systems, there are more resources for system operators to improve the operation and control of the whole system and enhance the reliability of electricity supply to customers. The distribution systems with DG are able to operate in islanding operation mode intentionally or unintentionally. In order to smooth the transition from grid connected operation to islanding operation for distribution systems with DG, a multi-agent based controller is proposed to utilize different resources in the distribution systems to stabilize the frequency. Different agents are defined to represent different resources in the distribution systems. A test platform with a real time digital simulator (RTDS), an OPen Connectivity (OPC) protocol server and the multi-agent based intelligent controller is established to test the proposed multi-agent based frequency controller. The modeling of different DG is discussed in details. Two distribution systems with DG are used to carry out case studies to illustrate the proposed multi-agent controller.

  • 56. Cha, S. T.
    et al.
    Zhao, H.
    Wu, Q.
    Saleem, Arshad
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ostergaard, J.
    Coordinated control scheme of battery energy storage system (BESS) and distributed generations (DGs) for electric distribution grid operation2012Inngår i: IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, IEEE , 2012, s. 4758-4764Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper describes a coordinated control scheme of battery energy storage system (BESS) and distributed generations (DGs) for electric distribution grid operation. The BESS is designed to stabilize frequency and voltages as a primary control after the electric distribution system enters into the islanding operation mode, while the centralized joint load frequency control (CJLFC) utilizing DGs handles the secondary frequency regulation. The BESS with the associated controllers has been modelled in Real-time digital simulator (RTDS) in order to identify the improvement of the frequency and voltage response. The modified IEEE 9-bus system, which is comprised of several DG units, wind power plant and the BESS, has been employed to illustrate the performance of the proposed coordinated flexible control scheme using RTDS in order to verify its practical efficacy.

  • 57.
    Cha, Seung-Tae
    et al.
    Technical University of Denmark.
    Wu, Qiuwei
    Technical University of Denmark.
    Østergaard, Jacob
    Technical University of Denmark.
    Saleem, Arshad
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Multi-agent based controller for islanding operation of active distribution networks with distributed generation2011Inngår i: DRPT 2011: 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies, IEEE conference proceedings, 2011, s. 803-810Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The increasing amount of distributed generation (DG) in today's highly complex restructured power networks gives more options for distributionsystem operators (DSOs) under contingency conditions. A low voltagedistribution network with a large amount of DG can be operated as an islanded system if the distribution system is disconnected from the main grid due to the contingency. The control and management of the islandeddistribution system are important, and the overall network synchronism must be maintained in the islanded distribution system. In this paper, a multi-agentbased controller is proposed to stabilize the frequency and voltages of anactive distribution system after it enters into the islanding operation mode. The modified IEEE 9-bus system was used to illustrate the dynamic and steady state performance of the active distribution system during islanding operationwith the proposed multi-agent based controller. Case studies have been carried out using the RealTime Digital Simulator (RTDS). Case study results show that the proposed multi-agent controller can efficiently help stabilize the frequency and voltages of active distribution systems after switching toislanding operation.

  • 58.
    Chaitanya, Deshpande
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Multi-Agent Based Fault Localizationand Isolation in Active DistributionNetworks2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Liberalized electricity markets, increased awareness of clean energy resources and theirdecreasing costs have resulted in large numbers of distributed power generators beinginstalled on distribution network. Installation of distributed generation has altered thepassive nature of distribution grid. A concept of Active Distribution Network is proposedwhich will enable present day infrastructure to host renewable energy resources reliably.Fault management that includes fault localization, isolation and service restoration ispart of active management of distribution networks.This thesis aims to introduce a distributed protection methodology for fault localizationand isolation. The objective is to enhance reliability of the network. Faults are identifiedbased on root mean square values of current measurements and by comparing thesevalues with preset thresholds. The method based on multi-agent concept can be usedto locate the faulty section of a distribution network and for selection of faulty phases.The nodal Bus Agent controls breakers that are associated with it. Based on indicationof fault, adjacent bus Agents communicate with each other to identify location of fault.A trip signal is then issued to corresponding Breakers in adjacent Bus Agents, isolatingthe faulty section of line. A case study was carried out to verify suitability of the proposedmethod. A meshed network model and multi-agent based protection scheme wassimulated in Simulink SimPowerSystems. Considering nature of Distribution Network,separate breakers for each phase are considered. The distribution network protectionsystem identified fault introduced in the network correctly along with interrupting thefault current.Keywords

    Fulltekst (pdf)
    fulltext
  • 59.
    Chamorro, Harold R.
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Nazari, Mohammad
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Babazadeh, Davood
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Malik, Naveed ur Rehman
    KTH, Skolan för elektro- och systemteknik (EES), Elektrisk energiomvandling.
    Ghandhari, Mehrdad
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Consensus Control for Induction Motors Speed Regulation2014Inngår i: 2014 16TH European Conference on Power Electronics and Applications, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Cyber Physical Energy Systems (CPES) development requires the combination of distributed intelligence to fulfill the future complex tasks and reach the increase the energy demands. Electrical Industrial Systems (EIS) are in continuous evolving integrating new technologies allowing to a better performance and increase the efficiency. This paper applies the consensus protocol for Multi-Agent Systems (MAS) to control the speed of multiple induction motors. In this paper, the behaviour of the system under different disturbances and scenarios has been simulated, thus, confirming the suitability and simplicity of this method for coordinating the control actions.

  • 60.
    Chen, Zhenwei
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Virtual Power Plant Simulation and Control Scheme Design2012Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Virtual Power Plant (VPP) is a concept that aggregate Distributed Energy Resources (DER) together, aims to overcome the capacity limits of single DER and the intermit-ted natural characteristics of renewable energy sources like wind and solar. The whole system can be viewed as a single large-capacity power plant from the system‘s point of view.

    In this project, the literature review of VPP concept, architecture, existed project and the survey of VPP in Sweden are being conducted first. Secondly, the simplified VPP model is built on MATLAB/Simulink software. The simplified system contains a wind farm, a hydro power plant, a dynamic system load and an infinite bus representing the large transmission grid. During the simulation process, the generation and consump-tion unites are running according to the real history data located in external database. In the third place, optimized control schemes for the hydro unit in VPP model to decrease its effects on transmission grid are implemented in Simulink model. At the same time, hydro turbine should be controlled in an optimized way that without large turbulence. Basically, the hydro power plant is responsible for balancing the active power between the wind farm and dynamic load. Since there is a limit for the hydro turbine output, the rest of either power shortage or surplus power need to be com-pensated by the grid. This is the fundamental control scheme, so called run time con-trol scheme. The advanced control schemes here are based on the moving average control method and forecast compensation control method. The forecast compensa-tion control method use the 24 hours ahead load forecasting data generated by Artifi-cial Neural Network. Later on, analysis of those three control schemes will be pre-sented. The last part of the project is the conclusion of the different control schemes according to comparison of their control results.

    Fulltekst (pdf)
    MTh 2012-019 Zhenwei Chen
  • 61.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Analyzing Non-Functional Capabilities of ICT Infrastructures Supporting Power System Wide Area Monitoring and Control2013Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The strain on modern electrical power systems has led to an ever-increasing utilization of new information and communication technologies (ICT) to improve their efficiency and reliability. Wide area monitoring and control (WAMC) systems offer many opportunities to improve the real-time situational awareness in the power system. These systems are essen-tially SCADA systems but with continuous streaming of measurement data from the power system. The quality of WAMC systems and the applications running on top of them are heavily, but not exclusively, dependent on the underlying non-functional quality of the ICT systems.

    From an ICT perspective, the real-time nature of WAMC systems makes them susceptible to variations in the quality of the supporting ICT systems. The non-functional qualities studied as part of this research are performance, interoperability and cyber security. To analyze the performance of WAMC ICT systems, WAMC applications were identified, and their requirements were elicited. Furthermore, simulation models capturing typical utility communication infrastructure architectures were implemented. The simulation studies were carried out to identify and characterize the latency in these systems and its impact on data quality in terms of the data loss.

    While performance is a major and desirable quality, other non-functional qualities such as interoperability and cyber security have a significant impact on the usefulness of the sys-tem. To analyze these non-functional qualities, an enterprise architecture (EA) based framework for the modeling and analysis of interoperability and cyber security, specialized for WAMC systems, is proposed. The framework also captures the impact of cyber security on the interoperability of WAMC systems. Finally, a prototype WAMC system was imple-mented to allow the validation of the proposed EA based framework. The prototype is based on existing and adopted open-source frameworks and libraries.

    The research described in this thesis makes several contributions. The work is a systematic approach for the analysis of the non-functional quality of WAMC ICT systems as a basis for establishing the suitability of ICT system architectures to support WAMC applications. This analysis is accomplished by first analyzing the impact of communication architectures for WAMC systems on the latency. Second, the impact of these latencies on the data quali-ty, specifically data currency (end to end delay of the phasor measurements) and data in-completeness (i.e., the percentage of phasor measurements lost in the communication), is analyzed. The research also provides a framework for interoperability and cyber security analysis based on a probabilistic Monte Carlo enterprise architecture method. Additionally, the framework captures the possible impact of cyber security on the interoperability of WAMC data flows. A final result of the research is a test bed where WAMC applications can be deployed and ICT architectures tested in a controlled but realistic environment.

    Fulltekst (pdf)
    fulltext
  • 62.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Wide area monitoring and control systems - application communication requirements and simulation2009Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Today’s electrical transmission & distribution systems, are facing a number of challenges related to changing environmental, technical and business factors. Among these factors are, increased environmental restrictions leading to higher share of production from renewable and uncontrollable sources as well as local environmental concerns regarding construction of new transmission and distribution lines. The re-regulation of the electricity market has created a dynamic environment in which multiple organizations have to coordinate and cooperate in the operation and control of the power system. Finally, the high rate of devel-opment within the ICT field is creating many new opportunities for power system opera-tion and control, thanks to introduction of new technologies for measurement, communi-cation and automation.

    As a result of these factors, Wide Area Monitoring and Control (WAMC) systems have been proposed. WAMC systems utilize new ICT based technologies to offer more accurate and timely data on the state of the power system. WAMC systems utilize Phasor Measure-ment Units (PMUs) that have higher data rates and are time synchronised using, GPS satel-lites. This allows synchronized observation of the dynamics of the power system, making it possible to manage the system at a more efficient and responsive level and apply wide area control and protection schemes. The success WAMC systems, on the other hand, are largely dependent on the performance of the Information and Communication Technology (ICT) infrastructure that would support them.

    This thesis investigates the requirements on, and suitability of the ICT systems that support WAMC systems. This was done by identifying WAMC applications and the elicitation of their requirements. Furthermore, a set of simulation projects were carried out to determine the communication system characteristics such as delay and the impact of this delay on the WAMC system.

    This thesis has several contributions. First, it provides summary and analysis of WAMC application priorities and requirements in the Nordic region. Secondly it provides simula-tion based comparison and evaluation of communication paradigms for WAMC systems. The research documented in this thesis addresses these paradigms by providing a compari-son and evaluation through simulation. Thirdly, the thesis provides insight to the possible sources of delay in WAMC architecture and the impact of these delays on data quality specifically data incompleteness. This provides insight on what applications are important to practitioners and what is the expected performance of these applications, as seen from the power system control and operation point of view.

    Fulltekst (pdf)
    FULLTEXT01
  • 63.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Al Khatib, Iyad
    Ivanovski, Jordan
    Maden, Volkan
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    PMU traffic shaping in IP-based wide area communication2010Inngår i: 2010 5th International Conference on Critical Infrastructure, CRIS 2010 - Proceedings, IEEE conference proceedings, 2010, s. 1-6Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor based Wide Area Monitoring and Control (WAMC) Systems are becoming a reality with increased research, development and deployments. Many potential control applications based on these systems are being proposed and researched. Such applications are either local applications using data from one or a few Phasor Measurement Units (PMUs) or centralized utilizing data from several PMUs. An aspect of these systems, which is less well researched, is the WAMC system dependence on high performance communication. This paper presents results of research on the use of Internet Protocol (IP) networks for both PMU and Remote Terminal Unit (RTU)/Intelligent Electronic Devices (IED) data for monitoring purposes. The paper examines performance aspects of the IP network Infrastructures when utilized by both: continuous PMU data streams and critical IED/RTU data. A set of simulation models characterizing a network of a Nordic Transmission System Operator were built to perform the analysis. The paper considers Quality of Service (QoS) strategies and the resulting delays and data loss that would be experienced.

    Fulltekst (pdf)
    fulltext
  • 64.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Kabilan, Vandana
    Department of Computer and Systems Sciences, Faculty of Social Sciences, Stockholm University. .
    Garcia Lozano, Marianela
    FOI, Swedish Defence Research Agency, Department of Systems Modelling.
    A Pattern for Designing Distributed Heterogeneous Ontologies for Facilitating Application Interoperability2006Inngår i: EMOI - INTEROP'06, Enterprise Modelling and Ontologies for Interoperability, Proceedings of the Open Interop Workshop on Enterprise Modelling and Ontologies for Interoperability / [ed] Michele Missikoff, Antonio De Nicola, Fulvio D'Antonio, CEUR-WS.org , 2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The role of ontologies in knowledge base systems is gradually increasing. Along with the growth of Internet based applications and e- commerce, the need for easy interoperability between ontologies is paramount. Today methodologies and design guidelines for building and developing ontologies from scratch exist, and others have focused on evolving step-by-step growth of ontologies as shall be discussed in this paper. However, we find inadequate aid in the design of distributed, heterogeneous and multi-functioned, application ontology, primarily aimed to be the central hub for interoperability between a number of other applications which may or may not be ontology based. In this paper, we present a logical context based ontology design architecture in the form of Principle-Subject-Support(PSS) pattern. The PSS pattern has been used as a guide to analyze and model   several perspectives involved in a practical case study carried out in a military network simulation project to build a distributed repository ontology (DRONT) for interoperability.

    Fulltekst (pdf)
    fulltext
  • 65.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Karam, Elias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Modeling and Simulation of Wide Area Monitoring and Control Systems in IP-based Networks2009Inngår i: 2009 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, VOLS 1-8, New York, USA: IEEE , 2009, s. 2514-2521Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor based Wide Area Monitoring and Control Systems (WAMC) is becoming a reality with increased international research and development. Many aspects of these systems are being addressed and researched. These systems depend largely on high performance communication architecture. This paper addresses the analysis of PMU systems and communication architectures by utilizing simulation tools to implement and analyze models. Specifically, focusing on the transmission of Phasor samples to the Phasor Data Concentrator (PDC) and control signals from the WAMC systems back to substations devices. This done by implementing shared and dedicated communication network scenarios to analyze delays. This is the first step to analyzing the performance and scalability of the IT infrastructure to support PMU-based Systems.

  • 66.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Investigation of communication delays and data incompleteness in multi-PMU wide area monitoring and control systems2009Inngår i: 2009 International Conference on Electric Power and Energy Conversion Systems, EPECS 2009, 2009, s. 144-149Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor based Wide Area Monitoring and Control Systems (WAMC) are becoming a reality with increased international research and development. Many potential control applications based on these systems are being proposed and researched. An aspect which is less well investigated is the WAMC system's dependence on high performance communication systems. This paper presents the results of simulations performed in order to determine the characteristics of communication delays incurred in WAMC systems using multiple PMUs distributed over a large geographic area. Such systems normally include one or several Phasor Data Concentrator (PDC) that collect and sort the data from the PMUs. Two specific parameters, completeness and currency of the PMU data has been studied as part of the simulations. The results indicate that configuration of central nodes such as the PDC needs to be optimized based on the intended WAMC application being supported.

  • 67.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Modeling and Simulation of Wide Area Communication for Centralized PMU-based Applications2011Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 26, nr 3, s. 1372-1380Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Phasor-based wide-area monitoring and control (WAMC) systems are becoming a reality with increased research, development, and deployments. Many potential control applications based on these systems are being proposed and researched. These applications are either local applications using data from one or a few phasor measurement units (PMUs) or centralized utilizing data from several PMUs. An aspect of these systems, which is less well researched, is the WAMC system's dependence on high-performance communication systems. This paper presents the results of research performed in order to determine the requirements of transmission system operators on the performance of WAMC systems in general as well as the characteristics of communication delays incurred in centralized systems that utilize multiple PMUs distributed over a large geographic area. This paper presents a summary of requirements from transmission system operators with regards to a specific set of applications and simulations of communication networks with a special focus on centralized applications. The results of the simulations indicate that the configuration of central nodes in centralized WAMC systems needs to be optimized based on the intended WAMC application.

    Fulltekst (pdf)
    fulltext
  • 68.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Performance considerations in Wide Area Monitoring and Control Systems2010Inngår i: 43rd International Conference on Large High Voltage Electric Systems 2010, CIGRE 2010, 2010, s. 1-8Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor based Wide Area Monitoring and Control (WAMC) Systems are becoming a reality with increased research, development and deployments. Many potential control applications based on these systems are being proposed and researched. Such applications are either local applications using data from one or a few PMUs or centralized utilizing data from several PMUs. An aspect of these systems which is less well researched is the WAMC system's dependence on high performance communication systems. To understand the performance and scalability requirements for such systems, a survey on communications and technical requirements for applications based on Phasor Measurement Units (PMU) has been performed. The survey was carried out in the Nordic Region with participants from Transmission System Operators (TSOs) and researchers. The survey focused on documenting the state of art that TSOs and researchers are in, as well as, their plans and visions for the future. This includes planned PMU deployments and prioritization of PMU based applications, a brief summary of this survey is described in this paper. Furthermore, the paper also summaries work in which WAMC communication networks were modeled and simulated. Two basic paradigms were captured in these models: Shared communication and dedicated communication. In the shared communication the WAMC system operated on wide area network that is also utilized for other devices such as RTUs, as well as other possible network uses. In the dedicated model it was assumed that the network was only used for PMU data. 4 scenarios were implemented and simulated. These scenarios represented parameters such as bandwidth capacity or channel capacity variation as well as variations in overall network traffic. Various End to End (ETE) Delay values were collected. A further study focused on analyzing the impact of the PDC configurations on the overall End to End (ETE) delay and measurement quality specifically in terms of measurement data loss or completeness. These studies were done by varying the delays of PMU traffic in the network as well as the amount of time that the PDC would wait for measurements belonging to a specific timestamp arrived from all PMUs in the network. In the paper, a set of parameters that impact the overall performance, including transmission delays as well as delays depending on system architecture and use of PDC within WAMC systems are outlined. These parameters were modeled and simulated and the results compared to the finding from the PMU application survey conducted earlier.

  • 69.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Factors in assessing performance of wide area communication networks for distributed control of power systems2007Inngår i: 2007 IEEE LAUSANNE POWERTECH, VOLS 1-5, NEW YORK: IEEE , 2007, s. 1682-1687Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This position paper presents research that is being started on the subject of modeling and evaluating performance and related system quality concerns in design of information and communication technology platforms used for power system operation and control. The focus of the project is on how the performance and other quality aspects of such networks interact with modern power control system technologies such as for instance Wide Area Monitoring and Control (WAMC) systems. Specifically the paper presents an evaluation and modeling approach based on a set of theoretically grounded factors important for assessing performance of wide area control systems. These assessment factors are used to define the modeling semantics necessary for enhanced models of the information and communication technology platforms. The factors are further represented in Influence Diagrams, enabling analysis of their inter-dependence with for instance Bayesian analysis. This approach has the potential of offering decision support for design of high performance information and communication technology platforms, while at the same time considering other system qualities. The paper presents an overview of the suggested approach, complemented with influence diagrams describing the inter-dependence of performance factors. The paper also provides an example of application of the approach to a simple control system architecture.

    Fulltekst (pdf)
    fulltext
  • 70.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ullberg, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Wu, Yiming
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ericsson, Göran
    Swedish National Grid (Svenska Kraftnät), Sundbyberg, Sweden.
    A Framework for Wide-Area Monitoring and Control Systems Interoperability and Cybersecurity Analysis2014Inngår i: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 29, nr 2, s. 633-641Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wide-area monitoring and control (WAMC) systems are the next-generation operational-management systems for electric power systems. The main purpose of such systems is to provide high resolution real-time situational awareness in order to improve the operation of the power system by detecting and responding to fast evolving phenomenon in power systems. From an information and communication technology (ICT) perspective, the nonfunctional qualities of these systems are increasingly becoming important and there is a need to evaluate and analyze the factors that impact these nonfunctional qualities. Enterprise architecture methods, which capture properties of ICT systems in architecture models and use these models as a basis for analysis and decision making, are a promising approach to meet these challenges. This paper presents a quantitative architecture analysis method for the study of WAMC ICT architectures focusing primarily on the inter-operability and cybersecurity aspects.

  • 71.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Vanfretti, Luigi
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Bengtsson, Sebastian
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Implementation of an experimental wide-area monitoring platform for development of synchronized phasor measurement applications2011Inngår i: Power and Energy Society General Meeting, 2011 IEEE, IEEE , 2011, s. 1-8Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Synchrophasor-based Wide-Area Monitoring and Control Systems (WAMC) are becoming a reality with increased international research and development. Several monitoring and control applications based on these systems have been proposed, and although with a relative small adoption, they are currently supporting the operations of some large transmission system operators. It is expected that the continued research and development of phasor data applications will enable the miracle of #x201C;Smart Grids #x201D; at the transmission level. The authors have realized that this can be achieved in timely fashion only if a research and development platform is developed to simultaneously address issues regarding information and communication infrastructures, and phasor data applications. This paper discusses the preliminary development, and deployment of an experimental wide-area monitoring and control platform in which several basic applications have been implemented, and that in the future will allow for the implementation and testing of envisioned applications. At its current stage, the platform allows both online monitoring and off-line analysis. In the future, it will be the cornerstone to a wider platform enabling research on phasor data applications that intrinsically account for ICT aspects.

    Fulltekst (pdf)
    fulltext
  • 72.
    Chenine, Moustafa
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Zhu, Kun
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Survey on Priorities and Communication Requirements for PMU-based Applications in the Nordic Region2009Inngår i: 2009 IEEE Bucharest PowerTech: Innovative Ideas Toward the Electrical Grid of the Future, IEEE , 2009, s. 1183-1190Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Phasor based Wide Area Monitoring and Control Systems (WAMC) promise to offer more accurate and timely data on the state of the power system, thus, increasing the possibilities to manage the system at a more efficient and responsive level and apply wide area control and protection schemes. This paper presents results of a survey on communications and technical requirements for applications based on Phasor Measurement Units (PMU). The survey was carried out in the Nordic Region with participants from Transmission System Operators (TSOs) and researchers. The survey focused on documenting the stage of research and development among TSOs and researchers in the Nordic Region, as well as, their plans and visions for the future. This includes planned PMU deployments and prioritization of PMU based applications. Furthermore, a significant part of the survey was an elicitation of communication requirements for applications based on PMU data. In the paper, an examination of the time requirements for these applications in terms of delays and samples per second and comparison similar published specifications is provided.

  • 73.
    CHOWDHURY, CLIPTON
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Evaluation of IEC 61175 for semanticinterpretation in OPAL-RT referencedistribution network and Jess-OPC2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In the past few decades the electric power system has seen tremendous growth in termstechnology such as integration of DG and advanced power electronics devices. Such developmentsmainly include renewable energy, increased use of HVDC transmission, state ofthe art communication systems and adaptation of information modeling standards appliedto power systems. In this thesis work a RBTS distribution grid network model has beenimplemented in OPAL-RT to integrate automation and ICT with more devices. These motivateuse of standardization like IEC 61850 and IEC 61175. This network model is usedfor verification of earlier developed monitoring and control methods at the ICS department.The verification setup involves interfacing of the network models in OPAL-RT with Jessrule engine via OPC. The focus of this master project work is evaluation of the use of IEC61175 for consistent signal naming in the network model. It is done through detailed signalmodeling in the Simulink model for use in the real time simulation and implementation ofa graphical user interface to show all the signals along with their measured value in a treeview. Second part of the work focuses on utilization of the signal modeling in high-levelapplications. The applications can utilize the consistent signal naming done by using IEC61175 to implement a semantic reasoning model for interpretation of the signals and therebyimprove the monitoring and control functions. An interface has been implemented to generatean XML file of the mapped signals along with the last measured value for the parserimplemented in Java. After parsing the XML file all the data is used for the Jess rule engineto fire the particular rule in a specific situation. Some rules are implemented for monitoringthe system voltage and for finding out the signals associated with distributed generationunit to calculate their actual generation in the network. In this project an ontology basedapproach is also performed in JADE to get a clear idea of integration of information sources.Results of the work show that proper signal designation in a network according the standardIEC 61175 can potentially help reduce the complexity and improve reliability of operations.

    Fulltekst (pdf)
    fulltext
  • 74.
    COUCKUYT, LORENZ
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Demand Response in Active Distribution Networks using integration of Network Manager and Aristo2013Independent thesis Advanced level (degree of Master (Two Years)), 10 hpOppgave
    Abstract [en]

    As distribution and transmission grids have to become more and more ’active’, in order to increase performance and economic profitability, control is getting more complicated. Therefore an integration of a network control system and a power system simulator would be useful for analysis and training of operators having to adapt to a new way of controlling the grid.

     This thesis describes the technical implementation work performed to successfully create such an application: an integration of Network Manager and Aristo. Network Manager, created by ABB Ventix, is a network control center package, including SCADA. Aristo, created by Svenka Kraftnät, is a power system simulator for training purposes. Both systems are integrated using two modern standards: OPC UA and CIM. CIM is used to import the Svedala model from Aristo to Network Manager. OPC UA is used to integrate both programs in real time and provides communication of measurements, statuses and commands between both systems. CIM is used to export the Svedala power system model from Aristo to the databases of Network Manager. A local controller, optimizing the control of parallel transformers in substations, has been programmed in JACK. This local controller was also integrated in the system as a proof of concept.

     Our integrated Network Manager-Aristo platform can in the future be used in the ongoing research for better control strategies of grids by adding different local controllers and running different simulation scenarios.

  • 75.
    Darmon, Audrey
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Optimization of a Supply Chain: Christian Dior Couture2013Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Nowadays, all the enterprises in the fashion industry face the problem of variability of supply and demand. Working in fashion implies facing rapid changes, and the success or failure of a company is often determined by the company's ability to adapt and respond quickly to these changes. In addition to having to deal with large quantities of information, the companies must ensure the availability of all their products, in all the stores worldwide, while optimizing inventory levels.

    This research will focus on Christian Dior Couture and more specifically on the Eyewear. The immediate objective of this research project is to optimize the inventory while maintaining the sales. The information on stock out rates crossed with the sales quantity, the stock and the coverage enables supply chain's managers to make decisions at a store level and at a reference level to reduce the stock at its optimal value without compromising the sales' level. In the future, further studies could be made to try and optimise the reordered quantities in addition to optimizing the current stores' stock.

    Fulltekst (pdf)
    fulltext
  • 76.
    Dennis, Andersson
    et al.
    Swedish Defense Research Agency.
    Granåsen, Magdalena
    Swedish Defense Research Agency.
    Sundmark, Thomas
    Swedish Defense Research Agency.
    Holm, Hannes
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Hallberg, Jonas
    Swedish Defense Research Agency.
    Analysis of a Cyber Defense Exercise using Exploratory Sequential Data Analysis2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Baltic Cyber Shield 2010 (BCS), a multi-national civil-military cyber defense exercise (CDX), aimed to improve the capability of performing a CDX and investigate how IT attacks and defense of critical infrastructure can be studied. The exercise resulted in a massive dataset to be analyzed and many lessons learned in planning and executing a large-scale multi-national CDX. A reconstruction & exploration (R&E) approach was used to capture incidents such as attacks and defensive countermeasures during the exercise. This paper introduces the usage of R&E combined with exploratory sequential data analysis (ESDA) and discusses benefits and limitations of using these methods for analyzing multi-national cyber defense exercises.Using ESDA we were able to generate statistical data on attacks from BCS, such as number of reported attacks by the attackers and the defenders on different type of services. Initial results from these explorations will be analyzed and discussed.

  • 77.
    Deo, Samarth
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Synchronized Phasor Measurement Units: Implementation of PMU Algorithm on HVDC Control Platform2013Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Power Systems most often operate in the margins of stability limits. With power grids becoming even more automated now, Phasor Measurement Units (PMU’s) and Phasor Data Concentrators (PDC’s) become essential for real-time control of the system. Since PMU’s are time synchronized, the phasors can be compared at the substations, studied for any faults and analyzed at the same time. These PMU’s report the measured magnitude, phasor angle of voltages and currents in real synchronized time in different locations. One good way to measure these quantities is to use the Discrete Fourier Transform (DFT) and analyze the signal as a digital signal. However with transients and noise present in the input signal, DFT might not be the best approach for measurement and/or protection. With the IEEE C37.118 (Standard for Synchrophasor for Power Systems) 2011 version emphasizing on the importance of the two classes of PMU’s- P-class for Protection and M-class for Measurement; every vendor now has to label their products with one of these classes. There is a high precision required for P-class PMU’s whereas a good reporting rate for M-class. Recently The North-American Synchrophasor Initiative (NASPI) and Western Electricity Coordinating Council (WECC) also gave filtering specifications and frequency response of an industry compliant PMU.

    This thesis discusses the various frequency estimation algorithms, which are compliant with the NASPI/WECC standards. Further such an algorithm is implemented on ABB proprietary hardware and tested against dynamic tests.

    Fulltekst (pdf)
    fulltext
  • 78.
    Dán, György
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsnät.
    Sandberg, Henrik
    KTH, Skolan för elektro- och systemteknik (EES), Reglerteknik.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Björkman, Gunnar
    Challenges in Power System Information Security2012Inngår i: IEEE Security and Privacy, ISSN 1540-7993, E-ISSN 1558-4046, Vol. 10, nr 4, s. 62-70Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Achieving all-encompassing component-level security in power system IT infrastructures is difficult, owing to its cost and potential performance implications.

  • 79.
    Eberhardt, Henrik
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lindblom, David
    KTH, Skolan för elektro- och systemteknik (EES).
    A PERSPECTIVE ON PRIORITIZATION IN PROJECT PORTFOLIO ENVIRONMENT2011Independent thesis Advanced level (professional degree), 20 poäng / 30 hpOppgave
    Abstract [en]

    The overbridging aspect of this interpretative master thesis is the implementation of a project prioritizing strategy. The concept is subdivided into three processes and entities, which could be seen as tools; project management office(PMO), project evaluation and project selection, which in turn are discussed separately. The thesis investigates how the tools impact the prioritizing strategy and why a company must follow a certain prioritizing strategy. The primary focus has been an IS/IT department at a large Swedish industrial company. Results from interviews at the industrial company have been compared to current theory. In order to map best practice methods a benchmarking study has been conducted at an auto manufacturer, medical company and a telecom company. When implementing a prioritizing strategy it is vital to have a project methodology in order to streamline the project management itself. Also, a PMO with a controlling objective should focus on the task of verifying project information quality and thus minimizing the information overflow to the decision makers. To continuously improve the project mythology and minimize the secondary failures, project should be evaluated. Prioritizing process should not only be made in the project selection phase but continuously during portfolio life cycle by comparing project relevance to risk. A prioritizing strategy would not only highlight the most important projects in the organization, but also make sure that they also receive highest support. A vision for a well defined prioritizing strategy is having project that consume more resources for a shortened time frame instead of having projects consuming less resources but for a longer time frame.

    Fulltekst (pdf)
    fulltext
  • 80.
    Edelstam, Johannes
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Language Assessment of anN Interoperability Assessment Language2011Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In order to assure the usability, validity and reliability of an enterprise architecture analysis framework, it needs to be tested and evaluated. This report shows how such a test and evaluation can be performed using a real world scenario.

    The study will investigate a language for interoperability assessment proposed by Johan Ullberg et. al. in a construction project in Stockholm called the Royal Seaport project. The language is first used to evaluate the interoperability in the future IT-architecture in this project. Then the use of the language is evaluated according to best practices in a case study.

    Finally improvements and changes are proposed to the language, which would enhance its use in the earlier mentioned project.

    Fulltekst (pdf)
    fulltext
  • 81.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    An empirical approach to a general theory of software (engineering)2013Inngår i: 2013 2nd SEMAT Workshop on a General Theory of Software Engineering (GTSE), 2013, s. 23-26Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This article describes an approach to how a general theory of software engineering could be developed. It argues that the approach should be top-down in nature. It also argues that the theory should include predictive capabilities that are empirically corroborated and as a result of the ambition to be general the theory needs to be probabilistic. Brief examples of such theories are provided.

  • 82.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    On Software Models2001Rapport (Annet vitenskapelig)
  • 83.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Dondossola, Giovanna
    Pietre-Cambacedes, Ludovic
    McDonald, John
    Torkilseng, Åge
    Modelling of cyber attacks for assessing smart grid security2011Konferansepaper (Fagfellevurdert)
  • 84.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Franke, Ulrik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerstrom, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Sommestad, Teodor
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ullberg, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Buschle, Markus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    A Tool for Enterprise Architecture Analysis of Maintainability: CSMR 2009, PROCEEDINGS2009Inngår i: EUR CON SFTWR MTNCE REENGR / [ed] Winter A, Knodel J, Los Almitos: IEEE COMPUTER SOC , 2009, s. 327-328Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A tool for Enterprise Architecture analysis using a probabilistic mathematical framework is demonstrated. The Model-View-Controller tool architecture is outlined, before the use of the tool is considered. A sample abstract maintainability model is created, showing the dependence of system maintainability on documentation quality. developer expertise, etc. Finally, a concrete model of an ERP system is discussed.

  • 85.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Enterprise Architecture Modeling and Analysis of Quality Attributes: The Multi-Attribute Prediction Language (MAPL)2015Inngår i: Proceedings of the 1st Scandinavian Workshop on the Engineering of Systems-of-Systems (SWESoS 2015) / [ed] Jakob Axelsson, SICS , 2015, s. 10-12Konferansepaper (Annet vitenskapelig)
    Fulltekst (pdf)
    SWESoS proceedings
  • 86.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektroteknik och datavetenskap (EECS), Datavetenskap, Nätverk och systemteknik.
    Gorton, Dan
    Foreseeti AB, Sweden.
    Nydren, Joakim
    Foreseeti AB, Sweden.
    Shahzad, Khurram
    Foreseeti AB, Sweden.
    securiCAD by foreseeti: A CAD tool for enterprise cyber security management2015Inngår i: Proceedings of the 2015 IEEE 19th International Enterprise Distributed Object Computing Conference Workshops and Demonstrations, EDOCW 2015, 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a CAD tool for enterprise cyber security management called securiCAD. It is a software developed during ten years of research at KTH Royal Institute of Technology, and it is now being commercialized by foreseeti (a KTH spin-off company). The idea of the tool is similar to CAD tools used when engineers design and test cars, buildings, etc. Specifically, the securiCAD user first models the IT environment, an existing one or one under development, and then securiCAD, using attack graphs, calculates and highlights potential weaknesses and avenues of attacks. The main benefits with securiCAD are; 1) built in security expertise, 2) visualization, 3) holistic security assessments, and 4) scenario comparison (decision-making) capabilities.

  • 87.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lindström, Åsa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gammelgård, Magnus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johansson, Erik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Plazaola, Leonel
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Silva, Enrique
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Liliesköld, Joakim
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Consistent enterprise software system architecture for the CIO: a utility-cost based approach2004Inngår i: Proceedings of the 37th Annual Hawaii International Conference on System Sciences, 2004, 2004Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Previously, business operations of most large companies were supported by a number of isolated software systems performing diverse specific tasks, from real-time process control to administrative functions. In order to better achieve business goals, these systems have in recent years been extended, and more importantly, integrated into a company-wide system in its own right, the enterprise software system. Due to its history, this system is composed of a considerable number of heterogeneous and poorly understood components interacting by means of equally diverse and confusing connectors. To enable informed decision-making, the Chief Information Officer (CIO), responsible for the overall evolution of the company's enterprise software system, requires management tools. This paper proposes enterprise software system architecture (ESSA) as a foundation for an approach for managing the company's software system portfolio. In order to manage the overwhelming information amounts associated with the enterprise software system, this approach is based on two concepts. Firstly, the approach explicitly relates the utility of knowledge to the cost of its acquisition. The utility of knowledge is derived from the increased value of better-informed decision-making. The cost of knowledge acquisition is primarily related to the resources spent on information searching. Secondly, the approach focuses on ensuring the consistency of the architectural model.

  • 88.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Jonsson, Narcisa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Plazaola, Leonel
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Silva Molina, Enrique Javier
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Vargas, Norman
    An Organization-Wide Approach For Assessing Strategic Business And IT Alignment2005Inngår i: Proceedings from the Portland International Conference on Management of Engineering and Technology, 2005Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Contemporary firms operate in a dynamic environment for a number of reasons such as new technologies, entrepreneurial ideas, strategic alliances, mergers and acquisitions, and regulatory changes. A key for a well-functioning company is an Information Technology (IT) that is efficiently deployed to support the business objectives. Keeping business and IT strategies aligned as they evolve has been for several years in a row ranked amongst the top concerns of companies' executives. Despite this fact, there are few documented concepts and operation approaches for assessing business and IT alignment. This paper describes an organization-wide assessment approach, where the maturity model criteria and attributes are assessed with sub-questions for clarity.

  • 89.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Korman, Matus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Terruggia, Roberta
    Dondossola, Giovanna
    Application of a cyber security assessment framework to smart grid architectures2013Konferansepaper (Fagfellevurdert)
  • 90.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närmen, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Setting the Information Systems Goals2007Inngår i: Enterprise Architecture: Models and Analyses for Information Systems Decision Making, Studentlitteratur, 2007, s. 92-152Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 91.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Sommestad, Teodor
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Enterprise Architecture Models for Cyber Security Analysis2009Inngår i: 2009 IEEE/PES POWER SYSTEMS CONFERENCE AND EXPOSITION, NEW YORK: IEEE , 2009, s. 832-837Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Enterprise architecture is a rising discipline that is gaining increasing interest in both industry and academia. It pays attention to the fact that effective management of business and IT needs take a holistic view of the enterprise. Enterprise architecture is based on graphical models as a vehicle for system analysis, design, and communication. Enterprise architecture is also a potential support for control systems management. Unfortunately, when it comes to security analyses, the architectural languages available are not adapted to provide support for this. This presentation focus on research performed as part of the EU seventh framework program VIKING (Vital Infrastructure, Networks, Information and Control Systems Management) and the Swedish Centre of Excellence in Electric Power Engineering, EKC2. The research is focusing on developing and adapting security analyses frameworks to architectural languages on a level where information about control systems' configuration is scarce and thus incomplete and partly unreliable.

  • 92.
    Elfstadius, Martin
    et al.
    Linköpings Universitet.
    Gecer, Daniel
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Axehill, Daniel
    Linköpings Universitet.
    Method to detect and measure potential market power on electricity markets using the concept of monopolistic energy2009Inngår i: 2009 IEEE/PES Power Systems Conference and Exposition, PSCE 2009, Seattle, WA, 2009Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The existence of market power is a serious concern in modern electric energy markets. Systems and processes that monitor the trading is needed and much research and many proposals on how to deal with the problem have been introduced over the past couple of years. A challenge to all such methods is execution speed, since the identification of market power needs to be done in real-time as market prices are settled. To overcome this challenge the methods need to be simple, involving limited computational effort. This paper presents a simple method with the potential of overcoming the challenge of execution speed. The method is based on the idea of determining the participants with the ability to make considerable increases in price raises without losing all market shares. Such determination can be made in advance during day ahead trading to identify critical areas. During realtime settlement, the method can then be used in a second iteration to study the identified critical areas. In the paper we propose a way to calculate the remaining market shares after a large price raise and refer to these as Monopolistic Energy Levels. These calculated levels of energy, that are deliverable by a single certain participant or by a certain group of participants, are caused by the active congestions in the network. The method detects the quantity of these energy levels and their respective locations in the network. This is a prospective method when used with a prediction of the following days demand. The paper presents the background and development of the proposed method. The use of AC and DC power flow as means to determine the monopolistic energy levels are analyzed and discussed. The paper is concluded with examples of application of the method to a simple multi area power system.

  • 93.
    Eliasson, Hugo
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    MIMS - Multi Integrated Management Systems for Quality, Environment and Systematic Work Environment: A General management system, based on large Swedish companies2009Licentiatavhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    This thesis describes mature Multi Integrated Management System (MIMS), mainly within Swedish companies, certified against three or more certificates. Other criteria have been to have a business system, usually SAP R/3 and that the companies investigated have had more than 200 employees. The two main reasons to implement have been customer demands and company Group requirements. The most common standards, besides ISO 9001, ISO 14001 and AFS 2001:1/OHSAS 18001 (9K, 14K and 18K) are EMAS, FSC (wood, paper standard), PEFC (wood) with two cases.

    The following similarities describes the “Core in MIMS”, i.e. similarities between different standards. The most important parts are to have a policy, a manual and review.

    • Policy Statement – 4.2 (14K and 18K) 5.3 (9K)
    • Objectives - 4.3.3 (14K and 18K) 5.4.1 (9K)
    • Resources, Roles, Responsibility and Authority – 4.4.1 (14K and 18K) 5.5.1 and 6.1 (9K)
    • Documentation - 4.4.4 (14K and 18K) 4.2.1 (9K)
    • Control of Documents – 4.4.5 (14K and 18K) 4.2.3 (9K)
    • Control of Records – 4.5.3 (18K) 4.5.4 (14K) 4.2.4 (9K)
    • Competence; Training and Awareness – 4.4.2 (14K) 6.2.2 (9K)
    • Internal Audit – 4.5.4 (18K) 4.5.5 (14K) 8.2.2 (9K)
    • Management Review – 4.6 (14K and 18K) 5.6 (9K)

    The most common approaches are that the Graphical User Interface is based on a “Manual” or the “Deming Wheel”, but there are also other examples.

    A general management system is described and there are examples of content in a manual.

    In 2007 focus seems to be on audits and implementation of new standards (mainly systematic work environment) and SOX is mentioned for the first time. In academic literature successful examples of integration of management systems, with Lean production are described.

    ISO 9001:2008 is now available, but there is not that dramatic changes from previous version, and all changes make the standard easier to integrate with other standards than ISO 9001:2000.

     

    Fulltekst (pdf)
    FULLTEXT01
  • 94.
    Ericsson, Evelina
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Is there a need for a new process model in product development when implementing DFSS?2013Inngår i: 2013 Proceedings of PICMET 2013: Technology Management in the IT-Driven Services, 2013, s. 1618-1624Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Design for Six Sigma (DFSS) is a management concept fostering continuous improvement and structuring of organizations' product development processes and their included activities. Traditionally this concept is described based on the three perspectives of processes, roles and product development methods. However, most companies working with product development are not new in the product development field. They have a tradition of developing products and thus, already an existing product development process. Therefore, the question arises whether there is a need for another concept introducing a process structure for the product development field. It is also questionable if the provided process structures in DFSS contribute with something new. This article presents an analysis of seven companies, longtime DFSS adopters as well as non-DFSS organizations, from the perspective of how well their product development process resembles the ones advocated in DFSS with the purpose to find out if there is a need for a development process structure in DFSS or if that is common sense and a pre-requisite that already exists in mature developing organizations.

  • 95.
    Ericsson, Evelina
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Andersson, Roy
    Högskolan i Borås.
    Interview Survey of DFSS Adoption in Large Enterprises2010Konferansepaper (Fagfellevurdert)
  • 96.
    Ericsson, Evelina
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Buschle, Markus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lillieskold, Joakim
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Developing a Design for Six Sigma Framework For the Analysis of Product Development Processes2015Inngår i: 2015 PORTLAND INTERNATIONAL CONFERENCE ON MANAGEMENT OF ENGINEERING AND TECHNOLOGY (PICMET'15), IEEE Communications Society, 2015, s. 1549-1561Konferansepaper (Fagfellevurdert)
    Abstract [en]

    During the last decades the importance of product development (PD) has become apparent for organizations. A majority of companies' total business results are dependent on the outcome of PD activities, results that crucially depends on new product's success and sales revenue. PD must be evaluated continuously, even without a physical final product accessible to measure. Therefore, in product development there is a need to evaluate the PD organization and project activities. This article presents a product development framework for analysis of organizations' product development performance according to Design for Six Sigma and evaluation of DFSS adopted companies' level of implementation.

  • 97.
    Ericsson, Evelina
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gingnell, Liv
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lilliesköld, Joakim
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Implementing Design for Six Sigma in large Swedish product developing organisations – an interview study2014Inngår i: Total Quality Management and Business Excellence, ISSN 1478-3363, E-ISSN 1478-3371, Vol. 26, nr 5/6, s. 648-660Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    As a result of the organisational evolvement towards increased structure in product development (PD), supporting concepts like Design for Six Sigma (DFSS) have arisen. DFSS provides structuring guidelines as well as suggestions regarding tool and technique implementations for PD. Companies’ need for support and structure from such a concept does, however, not always correspond to the real content of the concept. This article examines the DFSS implementation strategy in four organisations to determine which parts of the DFSS concept are being used by companies. Results show that several of the most difficult activities in PD lack concrete support in DFSS. On the other hand, many of the clearly described actions of the concept are already well-operating methods in today's product developing organisations.

  • 98.
    Ericsson, Evelina
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gingnell, Liv
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lilliesköld, Joakim
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Successful risk management approaches in product development organizations: A case study experience2014Inngår i: 2014 Proceedings of PICMET '14: Infrastructure and Service Integration, IEEE , 2014, s. 2243-2253Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This article discusses experiences from case studies conducted at product developing departments in four multinational companies. All organizations are outstanding product developing companies with a long and successful historical background within product development. Therefore it is interesting to understand how these companies deal with risks in their product development processes. The aim of the paper is to find out if the Design for Six Sigma (DFSS) concept supports the need of industrial companies to deal with risks in their product development projects. The results show that DFSS promotes the company needs to some extent. There is a great method support in DFSS regarding how to consider technical risks. On the other hand, all companies included in this study would need more support to highlight the holistic perspective concerning cross functional collaborations, increased communication and avoiding sub-optimizations in development project, a requirement that is not sufficiently supported.

  • 99.
    Ericsson, Evelina
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gustafsson, Pia
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Höök, David
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    von Würtemberg, Marcks Liv
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Flores, Rocha Waldo
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Process Improvement Framework Evaluation2010Inngår i: 2010 International Conference on Management Science and Engineering, ICMSE 2010, NEW YORK: IEEE , 2010, s. 319-326Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    This paper analyzes and evaluates frameworks used in the IT and business domain. The purpose has been to discuss the characteristics, weaknesses and strengths of the frameworks to illuminate how companies can benefit from using them in synergy. Specific strengths within a specific framework such as maturity models and improvement programs have been identified. Many organizations today also use several different frameworks with partly the same content. Therefore, paper concludes by advocating for cooperation between functions using different frameworks based on the similarities identified within this paper to avoid creation of isolated framework islands. To be able to adopt a holistic approach and improve the entire business at an organization it is necessary to develop common methods for similar actions.

  • 100.
    Ericsson, Evelina
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gustafsson, Pia
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lilliesköld, Joakim
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Sörqvist, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    DFSS - Evolution or Revolution?: A study of critical effects related to successful implementation of DFSS2009Inngår i: Proceedings to International QMOD and Toulon-Verona Conference on Quality and Service Sciences, 2009Konferansepaper (Fagfellevurdert)
1234567 51 - 100 of 568
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf