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  • 1.
    Andrejs, Matveevs
    et al.
    Riga Technical University, Latvia.
    Fjodorovs, Jegors
    Riga Technical University, Latvia.
    Malyarenko, Anatoliy
    Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, Utbildningsvetenskap och Matematik.
    Algorithms of the Copula Fit to the Nonlinear Processes in the Utility Industry2017Ingår i: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 104, s. 572-577Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Our research studies the construction and estimation of copula-based semi parametric Markov model for the processes, which involved in water flows in the hydro plants. As a rule analyzing the dependence structure of stationary time series regressive models defined by invariant marginal distributions and copula functions that capture the temporal dependence of the processes is considered. This permits to separate out the temporal dependence (such as tail dependence) from the marginal behavior (such as fat tails) of a time series. Dealing with utility company data we have found the best copula describing data - Gumbel copula. As a result constructed algorithm was used for an imitation of low probability events (in a hydro power industry) and predictions.

  • 2.
    Axelsson, Jakob
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. RISE Research Institutes of Sweden, Sweden.
    Game Theory Applications in Systems-of-Systems Engineering: A Literature Review and Synthesis2019Ingår i: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 153, s. 154-165Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Systems-of-systems (SoS) are becoming increasingly common in more and more domains, spreading from the initial focus on government-controlled areas such as defense to open market industries. This implies that collaborative SoS are becoming more important, where the constituents need to be given incentives to join and remain within the SoS. Game theory has been proposed as a framework to model and analyze such SoS mechanisms. It aims at providing such incentives to the independently operated and managed constituents. This paper presents a systematic literature review on the applications of game theory to SoS engineering, together with a synthesis aiming at capturing the best practices for such an analysis. The main conclusions are that game theory can be applied to SoS in a wide range of application areas, and deal with problems related to acquisition, design, and operations. In particular, the operational formation of SoS are well suited for this kind of analysis, and this often requires the use of simulation techniques. However, most results in the field lack a validation in practice.

  • 3.
    Cai, Simin
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Gallina, Barbara
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Nyström, Dag
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Seceleanu, Cristina
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Larsson, Alf
    Ericsson AB, Stockholm, Sweden.
    Design of Cloud Monitoring Systems via DAGGTAX: A Case Study2017Ingår i: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 109, s. 424-431Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Efficient auto-scaling of cloud resources relies on the monitoring of the cloud, which involves multiple aggregation processes and large amounts of data with various and interdependent requirements. A systematic way of describing the data together with the possible aggregations is beneficial for designers to reason about the properties of these aspects as well as their implications on the design, thus improving quality and lowering development costs. In this paper, we propose to apply DAGGTAX, a feature-oriented taxonomy for organizing common and variable data and aggregation process properties, to the design of cloud monitoring systems. We demonstrate the effectiveness of DAGGTAX via a case study provided by industry, which aims to design a cloud monitoring system that serves auto-scaling for a video streaming system. We design the cloud monitoring system by selecting and composing DAGGTAX features, and reason about the feasibility of the selected features. The case study shows that the application of DAGGTAX can help designers to identify reusable features, analyze trade-offs between selected features, and derive crucial system parameters.

  • 4.
    Dersten, Sara
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Axelsson, Jakob
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Fröberg, Joakim
    Mälardalens högskola, Akademin för innovation, design och teknik.
    An empirical study of refactoring decisions in embedded software and systems2012Ingår i: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 8, s. 279-284Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper describes an empirical study of decision-making when changing the architecture in embedded systems. A refactoring of the system architecture often gives effects on both system properties and functions in the company organization, and there is a lack of efficient analysis methods for decision support in the system architecture process. This study investigates the information needed to make a decision about a system refactoring. Scenario-based interviews have been conducted with managers and system architects from companies developing embedded systems. The results show that the companies investigate similar issues regardless of their industry sector. The most wanted information prior to a decision is also presented.

  • 5.
    Martínez-Ortega, José-Fernán
    et al.
    Technical University of Madrid.
    Castillejo, Pedro
    Technical University of Madrid.
    Zuazua, Marta
    Technical University of Madrid.
    Garcia Hernando, Ana Belen
    Technical University of Madrid.
    Lopez, Lourdes
    Technical University of Madrid.
    Da Silva Fariña, Antonio
    Technical University of Madrid.
    Hernández, Vicente
    Technical University of Madrid.
    Wireless sensor networks in knowledge management2010Ingår i: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 1, nr 1, s. 2291-2300Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Research in Wireless Sensor Networks (WSN) necessarily touches on many research topics of Computer Science, Electronic Engineering and Telecommunication, basing on the existing work in related fields. However, the peculiarity of the WSN field is the interplay and integration of these foundation subjects, yielding a distinct topic worthy of further study in its own right. One of the main open issues in WSN research is to abstract the applications of complex low-level mechanisms, and one of the most powerful and flexible ways to achieve this is creating a Middleware layer that cover all this functionality, provide services to applications, allows the intercommunication among components, adapts dynamically to different operation modes and clearly differentiated from low-level components. Knowledgemanagement and ontologies are also helpful when WSN are used to monitoring and taking decisions. We deploy a WSN in a testing scenario in order to control environmental parameters according to user profile stored in the system.

  • 6.
    Sundström, Angelina
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Industriell ekonomi och organisation.
    Widforss, Gunnar
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Rosqvist, Malin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Hallin, Anette
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Industriell ekonomi och organisation.
    Industrial PhD students and their projects2016Ingår i: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 100, s. 739-746Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In the usual case a PhD student is enrolled and supervised at an academic faculty, in Sweden also most often employed at a department of the university. The whole doctoral education takes part in one single environment. There is an opportunity to enroll “classes” of industrial PhD students in industrial graduate schools. The PhD student is in these cases most often employed by an industry. Each PhD student has at least one academic supervisor, but also an industrial mentor. Sometimes the industrial mentor also holds a PhD and can formally also be an industrial co-supervisor. Even if the funding of the PhD student is a research project, the doctoral work is often not performed as a project. There are often severe delays of the dissertation. The public defense often happens a year after the funding has ended. This represents a large cost for the university or for the industry. The progression of the student lies outside the control of the university management and also the funding industry. We have conducted a case study to explore the organizing of PhD work with the purpose to describe whether project methodology could support industrial PhD students in their progression towards a PhD.

  • 7.
    Widforss, Gunnar
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Rosqvist, Malin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    The Project Office as Project Management Support in Complex Environments2015Ingår i: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 64, s. 764-770Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In the academic sector, most engineering research funding presupposes collaborative projects. Collaboration between academia and industry is encouraged. This approach creates successive complexity in most Research and Development (R&D) projects in many ways. Projects funded by the European Commission or jointly funded by national agencies are often encouraged to become large, competing companies may become partners, objectives are unclear, and overall vagueness usually increases with consortium size. Many companies and some research organizations have created project management offices (PMO) to deal with project complexity. Typically, project managers in research organizations are excellent researchers but less skilled or interested in project management. To help researchers stay focused on research and not get side tracked by project management, the PMO provides professional project management services to researchers and research projects. The combination of excellent research and professional project management is a success factor when handling a large portfolio of complex projects. We surveyed the directors of PMOs in Sweden to determine how PMOs cope with complexity in different organizations. This paper presents the results of that small survey and compares them with similar efforts at one Swedish university in a brief case study.

  • 8.
    Yu, Kan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Gidlund, Mikael
    ABB, Corporate Research.
    Åkerberg, Johan
    ABB, Corporate Research.
    Björkman, Mats
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Reliable and Low Latency Transmission in Industrial Wireless Sensor Networks2011Ingår i: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 5, s. 866-873Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The major advantages with Industrial Wireless Sensor Networks (IWSNs) in process automation are cable cost reduction, enhanced flexibility and enabling new emerging applications such as wireless control. However, transmission over the wireless channel is prone to noise and interference which causes packets to be erroneous received at the receiver node. To improve the link reliability in lossy channels, error correcting codes are commonly used. In this paper we discuss the use of forward error correction (FEC) codes in IWSN in order not only to improve the link reliability but also to reduce the number of retransmissions in harsh industrial environments. We propose a FEC scheme suitable for MAC level protection where the packet is divided into groups and encoded using systematic FEC codes. We have implemented different FEC codes in a typical IWSN chip to evaluate memory consumption and to ensure that we are not violating the strict timing rules for acknowledgment. Our results show that some FEC codes are suitable to be implemented in a typical IWSN node while several fails due to large memory footprint or to long encoding and decoding time.

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