Research Outputs

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Now showing 1 - 10 of 47
  • Publication
    Generic Autonomic Management as a Service in a SOA-based Framework for Industry 4.0
    (IEEE, 2019-10) ; ;
    Delsing, Jerker 
    Cyber-physical production systems are engineered systems that are built from, and depend upon, the seamless integration of computational algorithms and physical components. In order to make these systems interoperable with each other for addressing Industry 4.0 applications a number of service-oriented architecture frameworks are developed. Such frameworks are composed by a number of services, which are inherently dynamic by nature and thus imply the need for self-adaptation. In this paper we propose generic autonomic management as a service and show how it can be integrated in the Arrowhead framework. We propose generic and reusable interfaces for each phase of the autonomic control loop in order to increase the usability of the service for other frameworks and application systems, while reducing the software engineering effort. To show the utility of our approach in the Arrowhead framework we use a climate control application as a representative example.
      424Scopus© Citations 10
  • Publication
    Application System Design - High Security
    (CRC Press, 2017)
    Aldrian, Andreas 
    ;
    Priller, Peter 
    ;
    Schmittner, Christoph 
    ;
    Plosz, Sandor 
    ;
    ;
    Wagner, Christian 
    ;
    Hein, Daniel 
    ;
    Ebner, Thomas 
    ;
    Maritsch, Martin 
    ;
    Ruprechter, Thomas 
    ;
    Lesjak, Christian 
      165
  • Publication
    Engineering of IoT automation system
    (CRC Press, 2017)
    Carlsson, Oscar 
    ;
    Vera, Daniel 
    ;
    Arceredillo, Eduardo 
    ;
    ;
    Bilal, Ahmad 
    ;
    Schmittner, Christoph 
    ;
    Plosz, Sandor 
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    Ruprechter, Thomas 
    ;
    Aldrian, Andreas 
    ;
    Delsing, Jerker 
      184
  • Publication
    A Security Cost Modelling Framework for Cyber-Physical Systems
    (ACM, 2022-05) ; ;
    Gouglidis, Antonios 
    ;
    Mauthe, Andreas 
    ;
    Cyber-Physical Systems (CPS) are formed through interconnected components capable of computation, communication, sensing and changing the physical world. The development of these systems poses a significant challenge since they have to be designed in a way to ensure cyber-security without impacting their performance. This article presents the Security Cost Modelling Framework (SCMF) and shows supported by an experimental study how it can be used to measure, normalise and aggregate the overall performance of a CPS. Unlike previous studies, our approach uses different metrics to measure the overall performance of a CPS and provides a methodology for normalising the measurement results of different units to a common Cost Unit. Moreover, we show how the Security Costs can be extracted from the overall performance measurements which allows to quantify the overhead imposed by performing security-related tasks. Furthermore, we describe the architecture of our experimental testbed and demonstrate the applicability of SCMF in an experimental study. Our results show that measuring the overall performance and extracting the security costs using SCMF can serve as basis to redesign interactions to achieve the same overall goal at less costs.
      167Scopus© Citations 2
  • Publication
    Towards Energy-Awareness in Managing Wireless LAN Applications
    (2012) ;
    Bhatti, S. N. 
    ;
    Yu, Y. 
    We have investigated the scope for enabling WLAN applications to manage the trade-off between performance and energy usage. We have conducted measurements of energy usage and performance in our 802.11n WLAN testbed, which operates in the 5 GHz ISM band. We have defined an effective energy usage envelope with respect to application-level packet transmission, and we demonstrate how performance as well as the effective energy usage envelope is effected by various configurations of IEEE 802.11n, including transmission power levels and channel width. Our findings show that the packet size and packet rate of the application flow have the greatest impact on application-level energy usage, compared to transmission power and channel width. As well as testing across a range of packet sizes and packet rates, we emulate a Skype flow, a YouTube flow and file transfers (HTTP over Internet and local server) to place our results in context. Based on our measurements we discuss approaches and potential improvements of management in effective energy usage for the tested applications.
      113Scopus© Citations 14
  • Publication
    Smart industrial indoor farming - Technical and societal challenges
    (Trauner, 2019)
    Schmittner, Christoph 
    ;
    Christl, Korbinian 
    ;
    Macher, Georg 
    ;
    Knapitsch, Johannes 
    ;
    Parapatits, Martin 
    ;
    ; ;
    Population growth and food development are two of the major challenges for society. While smart farming can help, available arable land is restricted. Smart industrial indoor farming has the potential to increase agricultural production while also reducing resources usage. To guarantee a reliable food supply, we need to ensure a dependable system, which protects not only the plants, but also the Intellectual property (IP). We give an overview about the challenges on agriculture, available indoor farming systems and standards for smart farming. We evaluate the standards for applicability towards indoor farming and present a use case for a smart industrial indoor farming system. To assure a dependable system, we present a methodology to analyze the system and achieve a trade-off between different dependability attributes.
      121
  • Publication
    Application Level Energy and Performance Measurements in a Wireless LAN
    (2011) ;
    Bhatti, S. N. 
    ;
    Yu, Y. 
    We present an experimental evaluation of energy usage and performance in a wireless LAN cell based on a test bed using the 5 GHz ISM band for 802.11a and 802.11n. We have taken an application-level approach, by varying the packet size and transmission rate at the protocol level and evaluating energy usage across a range of application transmission rates using both large and small packet sizes. We have observed that both the application's transmission rate and the packet size have an impact on energy efficiency for transmission in our test bed. We also included in our experiments evaluation of the energy efficiency of emulations of YouTube and Skype flows, and a comparison with Ethernet transmissions.
      141Scopus© Citations 24
  • Publication
    Trustworthy and High Assurance Cyber-Physical Systems - A Research Agenda
    (ERCIM EEIG, 2015) ;
    Wagner, Christian 
    ;
    Mauthe, Andreas 
      127
  • Publication
    Establishing a Chain of Trust in a Sporadically Connected Cyber-Physical System
    (IEEE, 2021-05) ; ; ;
    Stummer, Anna 
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    ; ;
    Pirker, Dominic 
    ;
    Schmittner, Christoph 
    ;
    Delsing, Jerker 
    Drone based applications have progressed significantly in recent years across many industries, including agriculture. This paper proposes a sporadically connected cyber-physical system for assisting winemakers and minimizing the travel time to remote and poorly connected infrastructures. A set of representative diseases and conditions, which will be monitored by land-bound sensors in combination with multispectral images, is identified. To collect accurate data, a trustworthy and secured communication of the drone with the sensors and the base station should be established. We propose to use an Internet of Things framework for establishing a chain of trust by securely onboarding drones, sensors and base station, and providing self-adaptation support for the use case. Furthermore, we perform a security analysis of the use case for identifying potential threats and security controls that should be in place for mitigating them.
      126