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  • 4501.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering.
    A UPPAAL model for timing analysis of atomic execution in component-based multi-mode systems2012Report (Other academic)
    Abstract [en]

    This report provides a complete UPPAAL model of an Atomic Execution Group (AEG) in a component-based multi-mode system (CBMMS) with pipe-and-filter architecture. The purpose of this model is to analyze the worst-case latency due to the atomic execution of this AEG during a mode switch. This worst-case latency plays a significant role in deriving the global mode switch time of a CBMMS.

  • 4502.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Flexible and efficient reuse of multi-mode components for building multi-mode systems2015In: The 14th International Conference on Software Reuse ICSR2015, 2015Conference paper (Refereed)
    Abstract [en]

    Component-Based Software Engineering (CBSE) is by the reuse of software components an effective approach to managing the growing software complexity of embedded systems. Another technique for reducing software complexity is to partition the system behavior into different operational modes, with each mode being associated with a unique behavior. Such a multi-mode system can change behavior by switching between modes under certain circumstances. Integrating CBSE and the multi-mode approach, we have developed the Mode Switch Logic (MSL), a framework dedicated to the development of multi-mode systems composed by reusable multi-mode components, i.e. components which can run in different modes. The mode switch handling of MSL is based on a fully distributed architecture in the sense that a system mode switch is achieved by the joint mode switches of different independently developed components. Algorithms that by inter-component communication guarantee the correctness of the mode switch have been developed. In this paper, we propose a mode transformation technique as a supplement to MSL for converting the distributed mode switch handling of MSL to a centralized mode switch handling. The goal is to enhance the run-time mode switch efficiency when components are deployed on a single hardware platform and global mode information is available. We demonstrate this technique by an example and reveal its potential industrial value.

  • 4503.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Flexible and efficient reuse of multi-mode components for building multi-mode systems---An extended report2014Report (Other academic)
    Abstract [en]

    Component-Based Software Engineering (CBSE) is by the reuse of software components an effective approach to managing the growing software complexity of embedded systems. Another technique for reducing software complexity is to partition the system behavior into different operational modes, with each mode being associated with a unique behavior. Such a multi-mode system can change behavior by switching between modes under certain circumstances. Integrating CBSE and the multi-mode approach, we have developed the Mode Switch Logic (MSL), a framework dedicated to the development of multi-mode systems composed by reusable multi-mode components, i.e. components which can run in different modes. The mode switch handling of MSL is based on a fully distributed architecture in the sense that a system mode switch is achieved by the joint mode switches of different independently developed components. Algorithms that by inter-component communication guarantee the correctness of the mode switch have been developed. In this report, we propose a mode transformation technique as a supplement to MSL for converting the distributed mode switch handling of MSL to a centralized mode switch handling. The goal is to enhance the run-time mode switch efficiency when components are deployed on a single hardware platform and global mode information is available. We demonstrate this technique by an example and reveal its potential industrial value.

  • 4504.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Handling emergency mode switch for component-based systems2014Conference paper (Refereed)
    Abstract [en]

    Software reuse is deemed as an effective technique for managing the growing software complexity of large systems. Software complexity can also be reduced by partitioning the system behavior into different modes. Such a multi-mode system is able to dynamically change its behavior by switching between different modes. When a multi-mode system is developed by reusable software components, a crucial issue is how to achieve a seamless composition of multi-mode components and handle mode switch properly. This is the motivation for the Mode Switch Logic (MSL), supporting the development of component-based multi-mode systems by providing mechanisms for mode switch handling. In this paper, MSL is extended and adapted to systems with emergency triggering of mode switches that must be handled with minimal delay. We propose an Immediate Handling with Buffering (IHB) approach to enable the responsive handling of such an emergency event in the presence of other concurrent non-emergency mode switch events. We present a model checking based verification of IHB and illustrate its benefits by an example.

  • 4505.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Handling emergency mode switch for component-based systems---An extended report2014Report (Other academic)
    Abstract [en]

    Component-Based Software Engineering has been introduced as a technique for the development of complex systems. Software complexity can also be reduced by partitioning the system behavior into different modes. Such a multi-mode system is able to change its behavior at runtime by switching between different operational modes. When a multimode system is developed by reusable software components, a crucial issue is how to achieve a seamless composition of multi-mode components and also how to handle mode switch properly. This is the motivation for the Mode Switch Logic (MSL), supporting the development of component-based multi-mode systems by providing mechanisms for mode switch handling. In this report, MSL is extended and adapted to systems with emergency triggering of mode switches that must be handled with minimal delay. We propose an approach, called Immediate Handling with Buffering (IHB), to enable the responsive handling of such an emergency event in the presence of other concurrent non-emergency mode switch events. We present a model checking based verification of the IHB approach, and illustrate its benefits by a small example.

  • 4506.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Handling multiple mode switch scenarios in component-based multi-mode systems2013In: Proceedings - Asia-Pacific Software Engineering Conference, APSEC, 2013, 404-413 p.Conference paper (Refereed)
    Abstract [en]

    The growing complexity of embedded systems software entails new development techniques. Component-Based Software Engineering is undoubtedly suitable for the development of complex systems thanks to its inherent component reuse. Another approach to reduce software complexity is by partitioning the system behavior into different operational modes. Each mode is associated with a unique behavior and the system can change behavior by switching between modes. When such a multi-mode system is developed by reusable software components, a crucial issue is how to achieve a seamless composition of multi-mode components and also how to handle mode switch properly. As an integrated solution to the challenges of multi-mode component-based software system development we have proposed the Mode Switch Logic (MSL). The current version of MSL assumes independent handling of a single mode switch scenario, i.e. that no other mode switch is triggered until an ongoing mode switch is completed. For a wide class of systems, this is an unrealistic assumption. In this paper we lift this assumption by proposing an extension of MSL to handle multiple mode switch scenarios concurrently triggered by different components.

  • 4507.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Handling multiple mode switch scenarios in component-based multi-mode systems2013Report (Other academic)
    Abstract [en]

    The growing complexity of embedded systems software entails new development techniques. Component-Based Software Engineering is undoubtedly suitable for the development of complex systems thanks to its inherent component reuse. Another approach to reduce software complexity is by partitioning the system behavior into different operational modes. Each mode is associated with a unique behavior and the system can change behavior by switching between modes. When such a multi-mode system is developed by reusable software components, a crucial issue is how to achieve a seamless composition of multi-mode components and also how to handle mode switch properly. As an integrated solution to the challenges of multi-mode component-based software system development we have proposed the Mode Switch Logic (MSL). The current version of MSL assumes independent handling of a single mode switch scenario, i.e. that no other mode switch is triggered until an ongoing mode switch is completed. For a wide class of systems, this is an unrealistic assumption. In this report we lift this assumption by proposing an extension of MSL to handle multiple mode switch scenarios concurrently triggered by different components.

  • 4508.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Mode switch timing analysis for component-based multi-mode systems2013In: Journal of systems architecture, ISSN 1383-7621, E-ISSN 1873-6165, Vol. 59, no 10, 1299-1318 p.Article in journal (Refereed)
    Abstract [en]

    The growing complexity of embedded systems software requires new techniques for their development. A common approach to reducing software complexity is to partition system behavior into different operational modes. Such a multi-mode system can change its behavior by switching between modes under certain circumstances. Another approach to simplifying software development is Component-Based Software Engineering, which allows a system to be developed by reusable components. Combining both approaches, we get component-based development of multi-mode systems, for which a key issue is the mode switch handling. Since most existing mode switch techniques do not consider component-based systems, we present in this article an approach—the Mode Switch Logic (MSL)—for the development of component-based multi-mode systems. Additionally, we provide a timing analysis for the mode switch of systems using our MSL. Finally, the fundamentals of MSL and its mode switch timing analysis are demonstrated and evaluated by a case study, an Adaptive Cruise Control system.

  • 4509.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering.
    Timing analysis for a composable mode switch2011In: ACM SIGBED Review, ISSN 1551-3688, Vol. 8, no 3, 15-18 p.Article in journal (Refereed)
    Abstract [en]

    Component based software development (CBD) reduces development time and effort by allowing systems to be built from pre-developed reusable components. A classical approach to reduce embedded systems design and run-time complexity is to partition the behavior into a set of major system modes. In supporting system modes in CBD, a key issue is seamless composition of multi-mode components into systems. In addressing this issue, we have developed a mode switch logic and algorithm for component-based multi-mode systems. In this paper we introduce timing analysis for our composable mode switch.

  • 4510.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering.
    Timing analysis for mode switch in component-based multi-mode systems2012In: PROCEEDINGS OF THE 24TH EUROMICRO CONFERENCE ON REAL-TIME SYSTEMS (ECRTS 2012), 2012, 255-264 p.Conference paper (Refereed)
    Abstract [en]

    Component-Based Development (CBD) reduces development time and effort by allowing systems to be built from pre-developed reusable components. Partitioning the behavior into a set of major operational modes is a classical approach to reduce complexity of embedded systems design and execution. In supporting system modes in CBD, a key issue is seamless composition of pre-developed multi-mode components into systems.We have previously developed a Mode Switch Logic (MSL) for component-based multi-mode systems implementing such seamless composition. In this paper we extend our MSL to cope with atomic transactions, i.e., to handle sets of components that must not be aborted in the middle of the processing of data. This is in contrast with our original MSL, in which components are immediately aborted to perform a mode switch. Based on our extended MSL, we provide analysis of the mode switch timing.

  • 4511.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Orlando, Daniele
    University of L’Aquila, L’Aquila, Italy.
    Miscia, Francesco
    University of L’Aquila, L’Aquila, Italy.
    Marco, Simone
    University of L’Aquila, L’Aquila, Italy.
    Component-based software development of multi-mode systems --- An extended report2016Report (Other academic)
    Abstract [en]

    Growing software complexity is an increasing challenge for the software development of modern embedded systems. A classical strategy for taming the software complexity is to partition system behaviors into different operational modes specified at design time. Such a multi-mode system can change behavior by switching between modes at runtime. Component-Based Software Engineering (CBSE) is a complementary approach to the software development of complex systems that fosters reuse of independently developed software components. CBSE and the multi-mode approach are fundamentally conflicting in that component-based development conceptually is a bottom-up approach, whereas partitioning systems into operational modes is a top-down approach. In this report we show that it is possible to combine and integrate these two fundamentally conflicting approaches. The key to simultaneously benefitting from the advantages of both approaches lies in the introduction of a hierarchical mode concept that provides a conceptual linkage between the bottom-up component-based approach and system level modes. As a result, systems including modes can be developed from reusable mode-aware components in the modeling phase. The conceptual drawback of the approach---the need for extensive message exchange between components to coordinate mode switches---is eliminated by an algorithm that collapses the component hierarchy and thereby eliminates the need for inter-component coordination. As this algorithm is used from the design to implementation level (``compilation''), the CBSE design flexibility can be combined with efficiently implemented mode handling. At the more specific level, this report presents (1) a mode mapping mechanism which formally specifies the mode relation between composable multi-mode components, (2) a mode transformation technique that transforms component modes to system-wide modes to achieve efficient implementation, and (3) a prototype tool that implements the mode mapping mechanism and mode transformation technique.

  • 4512.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Inam, Rafia
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Bril, Reinder J.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Sjödin, Mikael
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Formalization and verification of mode changes in hierarchical scheduling2014Conference paper (Refereed)
    Abstract [en]

    Hierarchical scheduling frameworks (HSFs) are a means for composing complex real-time embedded systems from independently developed and analyzed applications. To support multiple modes in a two-level HSF, the multi-mode adaptive hierarchical scheduling framework MMAHSF has recently been presented supporting different mode-change mechanisms. Currently, we provide a formalization and verification of mode changes in MMAHSF using the UPPAAL model checker for certain mode-change mechanisms. The verification indicates that MMAHSF and the proposed mode-change mechanisms are deadlock-free and guarantee mode changes in bounded time.

  • 4513.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Inam, Rafia
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Bril, Reinder J.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Sjödin, Mikael
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Formalization and verification of mode changes in hierarchical scheduling---An extended report2014Report (Other academic)
    Abstract [en]

    Hierarchical scheduling frameworks (HSFs) are a means for composing complex real-time embedded systems from independently developed and analyzed applications. To support multiple modes in a two-level HSF, the multi-mode adaptive hierarchical scheduling framework MMAHSF has recently been presented supporting different mode-change mechanisms. Currently, we provide a formalization and verification of mode changes in MMAHSF using the UPPAAL model checker for certain mode-change mechanisms. The verification indicates that MMAHSF and the proposed mode-change mechanisms are deadlock-free and guarantee correct mode changes in bounded time.

  • 4514.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Qin, H.
    Lund University.
    Carlson, Jan
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Hansson, Hans
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Mode switch handling for the ProCom component model2013In: CBSE - Proc. ACM SIGSOFT Symp. Compon. Based Softw. Eng., 2013, 13-22 p.Conference paper (Refereed)
    Abstract [en]

    Component-Based Software Engineering has been deemed a suitable technique for the development of complex embedded systems, as component reuse makes it easier to manage software complexity. Another way of reducing software complexity is by partitioning system behavior into different operational modes. Such a multi-mode system can change its behavior by switching between modes. For a multi-mode system built by components, a challenge is its mode switch handling. In this paper, a novel approach is presented to integrate our mechanism for handling mode switch (the Mode Switch Logic), in ProCom, which is a component model designed for the development of real-time embedded systems. The outcome is a slightly extended version of ProCom which not only supports the development of multi-mode applications, but also is able to handle mode switch. 

  • 4515.
    Yin, Hang
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Zhou, Jiale
    Mälardalen University, School of Innovation, Design and Engineering.
    Keskin, Ugur
    Eindhoven University of Technology.
    Bril, Reinder
    Eindhoven University of Technology.
    Accelerating exact schedulability analysis for fixed-priority scheduling2010In: / [ed] Robert I. Davis, 2010, 5-8 p.Conference paper (Refereed)
    Abstract [en]

    The schedulability analysis for fixed-priority pre-emptive scheduling (FPPS) plays a significant role in the real-time systems domain. The so-called Hyperplanes Exact Test (HET) is an example of an exact schedulability test for FPPS. In this paper, we aim at improving the efficiency of HET by combining it with initial values for exact response time analysis (RTA). We call the resulting improved test HETI and show by means of simulations that HETI is more efficient than HET.

  • 4516.
    Yngvesson, Markus
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Andersson, Henrik
    Mälardalen University, School of Innovation, Design and Engineering.
    Biomanagement2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    The society is changing faster than ever and more and more business is actively seeking help with their organisation. The theory in business management of our time is making man and nature more and more distinct from each other, it celebrates the intellect and logical thinking but forgets about our biological legacy. This paper is arguments for a more natural way of management and compares mankind’s communication with other developed species communication with emphasis on business management. For a durable and long-term development of the society it takes a whole new way of thinking; If everyone is selfish, no one gets anything but if everyone gives everyone gets – to give is to receive.

    In order to connect the theory with the reality interviews and an exercise was carried out on a company in Mälardalen. The interviews were analyzed with the aid of concentrating sentences in to categories in order to survey the activity in the corporation. The exercises were carried out as a statement of the positive effect of cooperation and a giving instead of an egoistic way of acting.

    This paper is to be seen as a wake up call and inspiration for further research than as a psychological or scientific thesis.

  • 4517.
    Yousef, Hoshang
    Mälardalen University, School of Innovation, Design and Engineering.
    Kreativitet och ledarskap: Kreativitetstaktik2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning   Uppsatsens titel:      Kreativitet och Ledarskap – kreativitetstaktik  Kurs:          KIN 180 – Examensarbete innovationsteknik Författare:        Hoshang Yousef Handledare:        Bengt Köping Olsson Begreppsutredning:  Kreativitet, ledarskap, taktik, orsak - verkan Syfte:   Syftet med denna uppsats är att undersöka kopplingen mellan ledarskap och kreativitet. För att uppnå detta foku-seras arbetet på två dimensioner, dels hur ledare/chef kan påverka kreativiteten, dels hur kreativitet och ledarskap fungerar i organisationer och företag. Även om det finns någon koppling eller skärningspunkt mellan dessa två äm-nen? Metod:  Jag utförde en observation där resultaten av analys samt diskussion. Jag observerade fler antal intervjuer med olika chefer från olika branscher. Dels är chefer som driver fö-retaget från givna roller. Jag fokuserade på hur de agerade i grupp och på vilka sätt som gruppen kommunicerade på. Ett viktigt moment i mitt arbete har varit litteraturstudium som kan vara en metod. Men framför allt intervjuerna är första viktiga delen, sedan andra delen är det forskningsar-tiklar och böckers litteratur. Metoden som jag har använd av är teori och böckers litteratur, samt en del artiklar. Teori:  I detta kapitel beskrivs den teori som uppsatsen bygger på. Teorin bygger på artiklar och kurslitteratur, som beskriver hur ledare kan främja det kreativa klimatet och hur ledar-skap och kreativitet fungerar. Empiri:   Under rubriken Empiri skriver jag resultat av dem utförda intervjuer som jag har genomfört med olika chefer. Resultat:  Resultat i detta kapitel besvarade inte min frågeställning och uppsatsuppdraget. Utan jag fick andra resultat som inte var förväntade av mig, har även presenterat förslag för möjligheter att förbättra den kreativa taktiken inom ledar-skapet. Analys/Diskussion:   Analys av intervjuerna var utifrån min analys som framstår det alltså att den teoretiska referensramen stämmer lite väl överens med dem empiriska arbetet som jag utfört, samt att intervjuresultatet jämförs mot den teori som uppsatsen bygger på. Avslut:   En stor tack för alla som har hjälpt mig med denna uppsats

  • 4518.
    Yu, Kan
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    On Reliable and Deadline-Constrained Communication in Wireless Industrial Networks2014Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Along with the quick development of wireless communication technologies, industrial automation networks are also in unceasing evolution. Industrial wireless sensor and actuator networks (IWSAN) have been increasingly adopted in industrial automation systems. Although there are a number of advantages of replacing cables with wireless links, such as cost reduction, enhanced scalability and flexibility, the stringent requirements on communication reliability and meeting firm deadlines from industrial mission-critical applications must still be fulfilled. Also, transmissions over wireless channels in industrial environments are prone to noise and interferences, resulting in frequent erroneous packet deliveries. Although industrial automation systems are usually designed to be tolerant of certain communication errors, successive transmission failures may still cause downtime of industrial applications, which might lead to significant economic losses or even serious accidents. This thesis addresses the problems mentioned above and aims to provide reliable and deadline-constrained communication via IWSANs for industrial automation systems. On the MAC layer, existing IWSAN standards utilize automatic repeat request (ARQ) to improve reliability at the cost of additional transmission latency. An alternative method is to use Forward Error Correction (FEC) schemes to provide reliable communication by recovering erroneous data and avoiding unnecessary retransmissions. On the MAC layer, Time Division Multiple Access (TDMA) is usually applied in current IWSAN standards for collision-free and deterministic communication. An inappropriate scheduling scheme may introduce high transmission jitter and degrade the quality of control. On the network layer, routing protocols play an important role in both communication reliability and latency. Existing solutions are either hardly able to fulfill all stringent requirements from the mission-critical industrial applications, too complicated to be realized, or lack verification in reality. The contributions of this thesis consist of (i) the possibilities of using FEC schemes in IWSANs is explored under the requirements of existing standards on the MAC layer. A compatible and flexible FEC scheme on the MAC layer for IWSANs that does not violate the standard is proposed and evaluated by simulations. (ii) To guarantee an acceptable control quality, a TDMA scheduling scheme is presented aiming for low communication jitter, and it is compared to classic scheduling schemes. (iii) The advantages of exploiting flooding in IWSANs is discussed; a reliable controlled flooding-based routing protocol is proposed and compared to both traditional routing protocols and other flooding-based protocols. (iv) A complete IWSAN platform is built and the whole protocol stack is implemented. Measurements were conducted in a real industrial environment to verify the correctness of the proposed solution.

  • 4519.
    Yu, Kan
    Mälardalen University, School of Innovation, Design and Engineering.
    On Reliable Real Time Communication in Industrial Wireless Sensor Networks2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In the industrial automation, Industrial Wireless Sensor Networks (IWSNs) have been increasingly applied due to a great number of benefits such as convenient installation, flexible deployment and cost efficiency. Compared with conventional wireless systems, IWSNs have more stringent requirements communication reliability and real time performance. However, IWSNs are frequently deployed in a hash industrial environment with electromagnetic disturbances, moving objects and non-line-of-sight (NLOS) communication. Because of the vulnerability of wireless signal, IWSNs are under high risk oftransmission failures, which may result in missing or delaying of process orcontrol data. For industrial automation, missing the process or control deadlineis intolerable, which may terminate industrial application and finally result in economic loss and safety problems. From hierarchy point of view, the high communication reliability and low communication latency can be achieved from different network layers. OnMAC layer, existing protocols in IWSNs only provide automatic repeat request (ARQ) to improve reliability at the cost of real time performance. Analternative method is to apply Forward Error Correction (FEC) mechanism on MAC layer to provide more reliable transmissions and reduce acknowledgement messages by recovering error data. On network layer, routing protocolplays an important role in both communication reliability and latency. Traditionalrouting protocols in IWSNs are either hardly able to fulfill both of these requirements or overcomplicated.In this thesis, we initially explore the possibilities of introducing FEC intoIWSN under the requirements of the existing standard on MAC layer. Then we propose compatible and flexible FEC schemes on MAC layer for IWSNs without violating the standard format. Routing protocols based on flooding are proved to increase the Packet Delivery Ratio (PDR) by transmission diversity.We propose reliable and robust routing protocols with respect to high reliability and real time performance for IWSNs.

  • 4520.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Barac, Filip
    Mid Sweden University.
    Gidlund, Mikael
    ABB, Corporate Research.
    Åkerberg, Johan
    ABB, Corporate Research.
    Adaptive Forward Error Correction for Best Effort Wireless Sensor Networks2012In: 2012 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), 2012, 7104-7109 p.Conference paper (Refereed)
    Abstract [en]

    In this work we propose an Adaptive Forward Error Correction (AFEC) algorithm for best effort Wireless Sensor Networks. The switching model is described in terms of a finite-state Markov model and it is based on the channel behavior,observed via Packet Delivery Ratio in the recent past. We compare the performance of AFEC with static FEC, as well as uncoded transmissions. The results demonstrate a gain in PDR achieved by introducing FEC coding in uncoded IEEE 802.15.4 transmissions, as well as the advantages over static FEC schemes,namely increased throughput and reduced energy consumption.The proposed solution is IEEE 802.15.4-compliant and requires no additional feedback channels.

  • 4521.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Filip, Barac
    Mid Sweden University.
    Mikael, Gidlund
    ABB, Corporate Research.
    Åkerberg, Johan
    ABB, Corporate Research.
    Mats, Björkman
    Mälardalen University, School of Innovation, Design and Engineering.
    A Flexible Error Correction Scheme for IEEE 802.15.4-based Industrial Wireless Sensor Networks2012In: IEEE International Symposium on Industrial Electronics, 2012, 1172-1177 p.Conference paper (Refereed)
    Abstract [en]

    Noise and interference make a substantial impacton wireless transmissions in industrial environments, resulting infrequent erroneous packet deliveries. Existing industrial communication standards adopt the IEEE 802.15.4 specification, which provides no means to correct the detected errors. We propose an IEEE 802.15.4-compliant Forward Error Correction-basedapproach that can be easily retrofitted into the standard withoutthe need for any kind of interaction with chip manufacturers orstandardization bodies. We evaluate the approach on link- and network-level scenarios. Improvement of reliability by using FEC can yield multiple benefits: a reduced number of retransmissions,and lower average latency, to name a few. With respect to the uncoded system, the proposed solution provides identical codinggain as the traditional FEC method, at a significantly lower computational load of decoding.

  • 4522.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Gidlund, M.
    ABB AB, Corporate Research, Sweden .
    Åkerberg, J.
    ABB AB, Corporate Research, Sweden .
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering.
    Reliable real-time routing protocol for industrial wireless sensor and actuator networks2013In: Proceedings of the 2013 IEEE 8th Conference on Industrial Electronics and Applications, ICIEA 2013, 2013, 1895-1901 p.Conference paper (Refereed)
    Abstract [en]

    The control applications of Industrial Wireless Sensor and Actuator Networks (IWSANs) are subject to strict requirements in terms of reliability and end-to-end delay. Transmission failures or deadline misses may seriously degrade the quality of control. In this paper, we propose a reliable real-time routing protocol in IWSANs for industrial control purpose. Node weight values and related node lists are utilized to provide directional information. Packet forwarding is based on a controlled flooding mechanism with several forwarding criteria. Performance evaluations via simulations show that significant improvements of reliability, real-time performance, network recovery time, and resource utilization efficiency can be achieved by our proposed routing protocol, compared with traditional routing protocols.

  • 4523.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Gidlund, Mikael
    ABB AB, Corporate Research.
    Åkerberg, Johan
    ABB AB, Corporate Research.
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Low Jitter Scheduling for Industrial Wireless Sensor and Actuator Networks2013In: 39TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2013): 39th Annual Conference of the IEEE Industrial Electronics Society, 2013, 5594-5599 p.Conference paper (Refereed)
    Abstract [en]

    Applying Industrial Wireless Sensor and Actuator Networks (IWSANs) in the industrial automation is a growing trend due to flexibility, mobility and low cost. According to the current standards, such as WirelessHART and ISA100.11a, multi-channel TDMA transmission is included for reliable and deterministic communication. In this paper, we clarify the dependence of TDMA scheduling for sensors and actuators and point out the low correlation between the scheduling delay and the overall quality of control, and focus on reducing jitter in scheduling for improving quality of control and system stability. We propose a scheduling algorithm, aiming for lowing jitter and compare it with two traditional real-time scheduling schemes. Our simulation results exhibit significantly lower jitters by applying our scheduling policy than those two traditional scheduling schemes.

  • 4524.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Gidlund, Mikael
    Mid Sweden University, Sweden.
    Åkerberg, Johan
    ABB Corporate Research, Västerås, Sweden.
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Performance Evaluations and Measurements of the REALFLOW Routing Protocol in Wireless Industrial Networks2017In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, 1410-1420 p., 7506102Article in journal (Refereed)
    Abstract [en]

    Industrial Wireless Sensor and Actuator Networks (IWSANs) offer significant advantages to industrial automation. However, high reliability demands and hard communication deadlines pose challenges to its practical applications. To achieve this goal, flooding is considered as a promising approach due to multipath diversity and simplicity. In this paper, an enhanced version of REALFLOW, a flooding-based routing protocol for IWSANs is presented. Compared to the original REALFLOW, network management and network stability are improved. REALFLOW is compared with four other flooding protocols via simulations. The simulation results show that REALFLOW has better performance in terms of reliability and consecutive transmission errors when considering deadlines. Compared with normal flooding, REALFLOW achieves comparable reliability performance with decreased redundancy. Measurements from a prototype implementation conducted in an industrial manufacturing workshop reveal that high reliability and low application failure rates can be achieved, giving more confidence in providing reliable wireless sensing and actuating for industrial automation

  • 4525.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Gidlund, Mikael
    ABB, Corporate Research.
    Åkerberg, Johan
    ABB, Corporate Research.
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering.
    Reliable and Low Latency Transmission in Industrial Wireless Sensor Networks2011In: Procedia Computer Science, ISSN 1877-0509, E-ISSN 1877-0509, Vol. 5, 866-873 p.Article in journal (Refereed)
    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.

  • 4526.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Gidlund, Mikael
    ABB, Corporate Research.
    Åkerberg, Johan
    ABB, Corporate Research.
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering.
    Reliable RSS-based Routing Protocol for Industrial Wireless Sensor Networks2012In: IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society: Proceeding, 2012, 3231-3237 p.Conference paper (Refereed)
    Abstract [en]

    High reliability and real-time performance are main research challenges in Industrial Wireless Sensor Networks (IWSNs). Existing routing protocols applied in IWSNs are either overcomplicated or fail to fulfill the stringent requirements. In this paper, we propose a reliable and flexible Received Signal Strength-based routing scheme. Our proposed solution can achieve a seamless transition in the event of topology change and can be applied in different industrial environments. The simulation results show that our solution outperforms conventional routing protocols in both reliability and latency. Furthermore, the result also proves that the changes of the network topology have no impact on data transmissions of other nodes by our scheme, whereas conventional routing protocols are shown to fail to recover the network in a short time. Finally, due to dynamic weighting mechanism, the proposed scheme is verified to achieve significantly higher reliability in scenarios with obstacles and avoid installation troubles, compared to location-based flooding scheme. Thus, our proposed scheme is considered to be more suitable for IWSNs than other routing protocols.

  • 4527.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Pang, ZB
    Corp Res, ABB AB, Sweden.
    Gidlund, M
    Corp Res, ABB AB, Sweden.
    Åkerberg, Johan
    Corp Res, ABB AB, Sweden.
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    REALFLOW: Reliable Real-Time Flooding-Based Routing Protocol for Industrial Wireless Sensor Networks2014In: International Journal of Distributed Sensor Networks, ISSN 1550-1329, E-ISSN 1550-1477, art. nbr: 936379- p.Article in journal (Refereed)
    Abstract [en]

    Wireless technologies have been increasingly applied in industrial automation systems due to flexible installation, mobility, and cost reduction. Unlike traditional wireless sensor networks (WSNs), industrial wireless sensor networks (IWSNs), when expanding from wireless monitoring to wireless control, have more stringent requirements on reliability, real-time performance, and robustness in a number of industrial applications. Successive transmission failures or deadline misses in these applications may severely degrade the control quality and result in serious economic losses and safety problems. Therefore, when deploying IWSNs in harsh industrial environments, to achieve reliable and deterministic end-to-end transmissions is critically important. In this paper, we explain the primary challenges of designing appropriate routing protocols and present a reliable real-time flooding-based routing protocol for IWSNs (REALFLOW). Instead of traditional routing tables, related node lists are generated in a simple distributed manner, serving for packet forwarding. A controlled flooding mechanism is applied to improve both reliability and real-time performance. A seamless transition in the event of topology change can be achieved by REALFLOW. Performance evaluations via simulations verify that significant improvements of reliability, real-time performance, and network recovery time can be achieved by REALFLOW, compared with traditional routing protocols.

  • 4528.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Yue, Jing
    University of Sydney, Australia.
    Lin, Z.
    University of Sydney, Australia.
    Åkerberg, J.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Björkman, M.
    ABB AB, Corporate Research, Sweden .
    Achieving reliable and efficient transmission by using network coding solution in industrial wireless sensor networks2016In: IEEE International Symposium on Industrial Electronics, 2016, 1162-1167 p.Conference paper (Refereed)
    Abstract [en]

    When deploying wireless sensor networks (WSNs) for industrial applications, to provide reliable data transmission as a stringent requirement must be fulfilled. However, due to dynamic industrial environments, interferences and node failures, to achieve this goal faces a number of challenges. Moreover, reliable transmission solution should also be resource efficient, so more wireless sensor nodes can be supported in a network especially when network resources are limited. In this paper, we applied network coding techniques based on a controlled flooding transmission scheme for industrial wireless sensor networks (IWSNs). Network and channel coding are joint designed for data transmission. We analyzed the theoretical performance of the proposed scheme and compared the performance of our method with the original transmission method in terms of reliability and efficiency. Comparison results showed that by using our proposed network coding solution, the reliability gain can be achieved and the network resource efficiency can be improved.

  • 4529.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Zheng, T.
    Beijing Jiaotong University.
    Pang, Z.
    ABB AB, Corporate Research, Sweden .
    Gidlund, M.
    ABB AB, Corporate Research, Sweden .
    Åkerberg, J.
    ABB AB, Corporate Research, Sweden .
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering.
    Reliable flooding-based downlink transmissions for Industrial Wireless Sensor and Actuator Networks2013In: Proceedings of the IEEE International Conference on Industrial Technology, 2013, 1377-1384 p.Conference paper (Refereed)
    Abstract [en]

    Reliable downlink transmissions from the sink to actuators for control data in Industrial Wireless Sensor and Actuator Networks (IWSANs) are extremely important for industrial control applications. However, on the network layer, existing routing protocols fail to fully support downlink transmissions for actuators, due to the insufficiency of reliability, robustness and real-time performance. In this paper, we propose a reliable flooding-based routing scheme focusing on downlink transmissions. Packets are forwarded to actuators according to weight values and the related node lists in intermediate nodes. Performance evaluations via simulations show that our protocol significantly outperforms traditional routing protocols in terms of reliability, transmission latency, network recovery time and network resource usage. © 2013 IEEE.

  • 4530.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Åkerberg, Johan
    Corp Res, ABB AB, Sweden.
    Gidlund, Mikael
    Corp Res, ABB AB, Sweden.
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering.
    Performance Evaluation and Measurement of REALFLOW Routing Protocol in WirelessIndustrial NetworksIn: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050Article in journal (Refereed)
    Abstract [en]

    Industrial Wireless Sensor and Actuator Networks(IWSAN) offer significant advantages to industrial automationsystems. Requirements on reliability are highly demanding formany industrial applications. Due to multipath diversity andsimplicity, flooding is an promising approach to provide reliabletransmissions.

    In this paper, a flooding-based routing protocol for IWSAN(REALFLOW) is upgraded based on previous research, aimingfor high reliability. To provide efficient and directionaltransmission, a controlled flooding-based mechanism is applied.Network management is further improved for better efficiencyand stability. REALFLOW is first compared with other fourflooding protocols via simulation. The results exhibit that REALFLOWoutperforms other advanced flooding protocols interms of reliability and consecutive transmission errors. Evencompared with pure flooding, REALFLOW achieves comparablereliability performance with decreased forwarding redundancy.To demonstrate the solution promising in reality, a workableIWSAN prototype is built, as well as the full implementation ofthe whole protocol stack including REALFLOW. A measurementconducted in a industrial manufacturing workshop reveals thathigh reliability and low application failure probability can beachieved, which brings more confidence of providing both reliablewireless sensing and actuating for industrial automation systems.

  • 4531.
    Yu, Kan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Åkerberg, Johan
    ABB AB Corporate Research, Sweden.
    Gidlund, Mikael
    ABB AB Corporate Research, Sweden.
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Realization and Measurements of Industrial Wireless Sensor and Actuator Networks2015Conference paper (Refereed)
    Abstract [en]

    Industrial automation can benefit from applying wireless sensor and actuator networks (WSAN) on cost reduction, mobility and flexibility. However, wireless solutions are more prone to interferences compared to wired ones. In order to avoid production losses and to keep the revenues at an anticipated level, it is of utmost importance for WSANs to meet the stringent requirements from industrial automation, such as high reliability and real-time performance. A great number of research efforts were taken in this field based on simulations, but simulation results may not show sufficient confidence. Existing implementations and products compatible with the standards may still fail to provide reliable and real-time communication. Therefore, in this paper we built a prototype of industrial wireless sensor and actuator networks (IWSAN) and implemented a protocol stack, aiming for providing reliable and real-time communication for mission-critical industrial applications. Afterwards, we deployed our prototype and conducted measurements in real industrial environments. Our measurement results exhibited possibility of applying IWSANs for industrial applications and brought more evidence to our industry.

  • 4532.
    Yue, Jing
    et al.
    School of Electrical and Information Engineering, The University of Sydney, Australia.
    Girs, Svetlana
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. IS (Embedded Systems).
    Åkerberg, Johan
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. ABB AB, Corporate Research, Sweden.
    Björkman, Mats
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. IS (Embedded Systems).
    Lin, Zihuai
    School of Electrical and Information Engineering, The University of Sydney, Australia.
    Network coding for reliable downlink transmissions in industrial wireless sensor and actuator networks2016In: Proceedings of the International Symposium on Wireless Communication Systems, Poznan, Poland, 2016, Vol. oct, 560-565 p., 7600967Conference paper (Refereed)
    Abstract [en]

    Benefits, such as significant reduction of cost and complexity, brought by wireless communication make wireless networks more and more appealing for industrial applications. However, before wireless systems can be deployed in industrial networks, strict industrial requirements on reliability and timeliness must be fulfilled and thus protocols increasing the performance of wireless communication are needed. Data in industrial systems is typically transmitted in two directions: from sensor nodes to a controller (uplink transmission) and from the controller to actuators (downlink transmission). Several previous studies have looked at possibilities of performance increase in uplink transmissions from the sensors, while not that much work focused on downlink transmissions, which are equally important. Thus, this paper addresses the downlink transmission scenario and presents a new protocol introducing network coding into packet forwarding scheme. Simulation results show that packet reception rate can be increased when network coding is applied.

  • 4533.
    Yuji, Yamamoto
    Mälardalen University, School of Innovation, Design and Engineering.
    Proposal of a deliberate discovery-learning approach to building exploration capabilities in a manufacturing organization2013In: Advances in Sustainable and Competitive Manufacturing Systems: 23rd International Conference on Flexible Automation & Intelligent Manufacturing, Springer, 2013, 1249-1262 p.Chapter in book (Refereed)
    Abstract [en]

    Many manufacturing organizations in developed countries need to be proficient in not only incremental improvements but also radical innovations. Radical innovations largely depend on exploration capabilities, in other words capabilities of searching, discovering, and developing radically new systems, processes, and operational practices. Since many manufacturing organizations are proficient in incremental improvements, an important challenge for them is to develop the exploration capabilities across the organizations. However, little knowledge has been accumulated as to how to develop such capabilities in practice. The main purpose of this paper is to propose an approach to building organization’s exploration capabilities. In the approach, the capabilities are built through leaders iteratively and deliberately creating situations where groups in an organization have to or can be more explorative. The approach is made by analogy from how organizational changes toward lean manufacturing were driven by an experienced lean consultant. In addition, this paper presents a model of how to practically apply the approach at companies. The model is developed firstly based on existing theories then modified through employing the model at a manufacturing company.

  • 4534.
    Yuji, Yamamoto
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Monica, Bellgran
    Mälardalen University, School of Innovation, Design and Engineering.
    Four types of manufacturing process innovation and their managerial concerns2013In: Procedia CIRP, vol. 7, 2013, 2013, 479-484 p.Conference paper (Refereed)
    Abstract [en]

    Manufacturing process innovation (MPI), an organization-wide effort involving radical redesign of manufacturing related processes and systems to achieve dramatic improvements in critical manufacturing performance measures, encompasses various kinds of activities. Some MPI initiatives focus on technological innovation and others may intend to change work processes and organizations’ behavioral routines. Some organizations adopt new technological solutions or work methods that are externally available, while others may develop and adopt novel technologies or organizational routines which are new to the state of the art. Different focus in MPI initiatives requires different approaches and preconditions for achieving desired outcomes. However, MPI has been mostly treated as one type of innovation in literature and further classifications of MPI have not been made. This paper presents four types of MPI and discusses what managers can expect and prepare for each type of MPI. Basic strategic directions in terms of what type of MPI can be conducted at a specific organization is also discussed. The four types of MPI is developed through a literature review of various research fields, for instance manufacturing strategy, process innovation, organizational innovation, typology of innovation, and new product development.

  • 4535.
    Yuji, Yamamoto
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Monica, Bellgran
    Mälardalen University, School of Innovation, Design and Engineering.
    Manufacturing process improvements using value adding process point approach2013Conference paper (Refereed)
    Abstract [en]

    Manufacturing functions need to be capable of constantly developing new manufacturing lines, cells, and pieces of equipment in order to maintain their operational competitiveness. This paper explores a unique approach to analyzing and designing manufacturing processes referred to as the Value Adding Process Point (VAPP) approach. This approach particularly focuses on the points where value is added to materials in manufacturing processes. The approach is mostly used at Japanese companies and it has contributed to developing unique manufacturing lines, cells, and pieces of equipment that tend to be simple, slim, and compact, and require low investment cost. The approach has also contributed to achieving major improvements in different performance measures in manufacturing. However, the approach is rarely known internationally. Moreover, the amount of practical information on how to apply the approach at companies has been limited in the scarce literature on the approach. The purpose of this paper is to introduce the VAPP approach to a broader audience and also to provide practical information on how to apply the approach by describing a case study in which the approach was applied at a Swedish manufacturing company. At the company, the application was made in a manner of experiential learning. In this paper, it is described how the VAPP approach was applied, what outcomes were generated by the application, and how participants in the case study experienced the application of the approach. Discussions are made as to usefulness of the approach and effective use of the approach.

  • 4536.
    Yuji, Yamamoto
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Monica, Bellgran
    Mälardalen University, School of Innovation, Design and Engineering.
    Manufacturing process innovation initiatives at Japanese manufacturing companiesIn: Journal of Manufacturing Technology Management, ISSN 1741-038X, E-ISSN 1758-7786Article in journal (Refereed)
  • 4537.
    Yusuf, Hassan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Sundström, Harald
    Mälardalen University, School of Innovation, Design and Engineering.
    Minska elförbrukningen i Produktion2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 4538.
    Yuvaraj, Vasanth Raj
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Zhang, Sifei
    Mälardalen University, School of Innovation, Design and Engineering.
    Reducing WIP Inventory of Production Line in AQ Segerström & Svensson AB2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The major objective of present study is to find out the sources which cause higher Work in Process (WIP) in the production line. In which a detailed analysis is performed in the area of inventory, reorder point, Takt time, and Kanban. All the analyses are based on the data obtained from the company’s ERP system and have been used to run some scenarios during the analysis.Lots of problems are responsible to cause higher WIP. But current report only focuses and concentrates in leveling the work load, implementing pull system, suggesting reorder point and Takt time.The current situation is described through Value-stream Map (VSM) and the impact cost matrix is used to show the impact of each problem in the production line in terms of costs. In the analysis chapter, root cause method has been used in order to show the cause and effect of higher WIP. Detailed analyses together with explanations are listed by orders. Therefore, three major suggestions are proposed and the future VSM is plotted to show the effect and change of the suggestions which helps to improve the current situation by eliminating the waste.

  • 4539.
    Zackrisson, M.
    et al.
    Swerea IVF AB, Sweden.
    Kurdve, Martin
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation. Swerea IVF AB, Sweden.
    Shahbazi, Sasha
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Wiktorsson, Magnus
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Winroth, M.
    Chalmers University of Technology, Sweden.
    Landström, A.
    Chalmers University of Technology, Sweden.
    Almström, P.
    Chalmers University of Technology, Sweden.
    Andersson, C.
    Lund University, Sweden.
    Windmark, C.
    Lund University, Sweden.
    Öberg, A.E.
    Volvo Construction Equipment AB, Sweden.
    Myrelid, A.
    GKN Aerospace Engine Systems AB, Sweden.
    Sustainability Performance Indicators at Shop Floor Level in Large Manufacturing Companies2017In: Procedia CIRP, Elsevier B.V. , 2017, 457-462 p.Conference paper (Refereed)
    Abstract [en]

    This article investigates sustainability in the performance measurement systems of Swedish manufacturing companies. It builds on a previous study that documents relatively few direct environmental indicators at shop floor level, which raises questions about possible indirect links between existing indicators and the environment that could be used to improve the environmental aspect of company's sustainability ambitions. A method for identifying and categorizing indirect links to sustainability issues was defined and used. The results suggest that at shop floor level 90% of the indicators have at least an indirect relation to one or more of the sustainability dimensions economy, environment and social, of which 26% are at least indirectly related to the environmental dimension. Despite the many indirect connections, participating companies perceive a need to improve sustainability indicators and some ideas are suggested. 

  • 4540.
    Zafarzadeh, Masoud
    Mälardalen University, School of Innovation, Design and Engineering.
    A Guideline for Efficient Implementation of Automation in Lean Manufacturing Environment2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The competitive climate of production and high labour cost, motivate western companies to use technologies like automation as a mean to increase manufacturing competitiveness. On the other hand companies are aware about cost reductive policies like lean production which has shown noticeable achievement; consequently some manufacturers tend to follow such system. In this situation, in order to have lean enterprise, it is vital to find a clear picture of challenges and potentials of implementing automation within a lean environment. If the process of developing automation is not efficient and companies’ strategy and mission is not considered in time of project development, the result may not be lean at the end. So finding an appropriate guideline that can be used in time of developing automated projects is very important.This thesis aims to develop a guideline that can be used in developing automation solutions to have lean result at the end of the projects. The guidelines can be used in both assembly and manufacturing development projects.VOLVO GTO has chosen as the case study for this thesis. In order to find the answer of research questions two main areas in manufacturing and assembly are marked.

  • 4541.
    Zafarzadeh, Masoud
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    Jackson, Mats
    Mälardalen University, School of Innovation, Design and Engineering, Innovation and Product Realisation.
    AUTOMATION FROM LEAN PERSPECTIVE: POTENTIALS AND CHALLENGES2013Manuscript (preprint) (Other (popular science, discussion, etc.))
    Abstract [en]

    The competitive climate of production and high labour cost, motivate western companies to use technologies like automation as a mean to increase manufacturing competitiveness. On the other hand companies are aware about cost reductive policies like lean production which has shown noticeable achievement, consequently some manufacturers tend to follow such system. In this situation, in order to have lean enterprise, it is vital to find a clear picture of challenges and potentials of implementing automation within a lean environment. So, finding the right level and type of automation becomes vital for companies, and achieving this is not possible without a lean development of automation. The paper presents an overview of automation development from a lean perspective. The focus is on manufacturing and a case study in the automotive industry is presented. Challenges and potentials of automation are pinpointed and some suggestions regarding automation development is given.

  • 4542.
    Zafarzadeh, Masoud
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Vedapatti Ranganathan, Hariram
    Mälardalen University, School of Innovation, Design and Engineering.
    Kurdve, Martin
    Mälardalen University, School of Innovation, Design and Engineering.
    Sustainable supply chain management in automotive industry- Supplier company relationship and Integration management challenge2012In: International Journal of Academic Conference Proceedings, v. 1, n. 2, 2012, Institute of Management Technology, 2012Conference paper (Refereed)
    Abstract [en]

    Growing competition in automotive industry has forced companies to have serious attention towards the sustainability concept. Obviously environmental, social and economic challenges do not only happen inside companies, but rather involves the whole supply chain process. Most of the practical efforts are focusing on manufacturing phase and less attention has been paid to supply and distribution areas. However, it is not possible to achieve a sustainable supply chain unless the current situation is accurately mapped and long term policies toward a sustainable future state are defined. In this respect, the authors consider two major challenges, first supplier coordination with sustainability requirements and second investigating the alliance of current managerial policies. In theory, the paper aim is to represent sustainable supply chain management by focusing on supplier company relations. Integration as a vital element to meet sustainable supply chain is discussed by exploring the coherence of lean and green with sustainability. In practice, three leading automotive companies’ Sustainable Supply Chain Management (SSCM) systems (TOYOTA, VOLVO and Volkswagen) are investigated in order to figure out their perspective toward SSCM.

  • 4543.
    Zahid, Muhammad Umair
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Rahi, Mehdi Mohammed Hasan
    Mälardalen University, School of Innovation, Design and Engineering.
    Evaluation of Two Web Development Technologies: Implementation of an online shopping store2011Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the thesis we have evaluate the differences between two web development technologies by developing the same two applications with same functional requirement  in different two technologies, Microsoft Visual Studio 2010 and Netbeans IDE 6.8. We use the Active Server Pages (ASP.NET) with C# in the Visual Studio 2010 and Java Server Pages (JSP) with Servlet in the NetBeans IDE 6.8. We have developed an online shopping store with some features for Admin and Client. We have found that NetBeans with JSP is faster in execution of the code as compare to Visual Studio with ASP.NET when we update any code because JSP compile the code at runtime. Meanwhile we have also found that ASP.NET is faster for development procedure because ASP.NET provides many built-in tools, controls and functions while as in JSP there is not so much built-in help to generate the code automatically. We have also face that Visual Studio with ASP.NET is easier to learn as compared to NetBeans with JSP because ASP.NET has strong and complete documentation inform of tutorials, books and examples.

     

  • 4544.
    Zakupszki, Andras
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Pichetpongsa, Nuttapon
    Mälardalen University, School of Innovation, Design and Engineering.
    Extending ABB’s WirelessHART Tool2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Within this decade, wireless technology has been used in process control in various industries. WirelessHART is one of the standards, used for creating communication networks for such purpose. Since the technology is relatively new, there are many known and unknown risks in deploying it in real life applications.ABB’s WirelessHART Tool is used for generating simulation scenarios that can be used for evaluating the performance of WirelessHART networks under different conditions.This paper describes in detail, how ABB’s WirelessHART Tool was extended by adding various new functionalities. The topics cover what obstacles we have faced, which solutions were used and why, how our solutions were evaluated and the outcomes. Furthermore, the paper documents the application structure of WirelessHART Tool.

  • 4545.
    Zakupszki, Andras
    et al.
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Pichetpongsa, Nuttapon
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Seceleanu, Tiberiu
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. ABB Corporate Research and Mälardalen University, Västerås, Sweden.
    Scheduling and simulating wireless HART systems2014In: Proceedings: 40th Euromicro Conference Series on Software Engineering and Advanced Applications, SEAA 2014, 2014, 318-319 p.Conference paper (Refereed)
    Abstract [en]

    Control processes and the communication between them must be scheduled appropriately, such that the I/O data is correlated. Here, we illustrate the design and realization of a Wireless HART system development tool, meant to support design decisions in communication and processing scheduling.

  • 4546.
    Zamani, Tanja
    Mälardalen University, School of Innovation, Design and Engineering.
    Att skapa riktlinjer åt tekniska illustratörer: Ett förslag inom branschen förpackningsmaskiner2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 4547.
    Zamansky, A.
    et al.
    University of Haifa, Carmel Mountain, Haifa, Israel .
    Rodriguez-Navas, Guillermo
    Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
    Adams, M.
    Proof Technologies Ltd., Worcester, United Kingdom.
    Spichkova, M.
    RMIT University, Melbourne, Australia .
    Formal methods in collaborative projects2016In: ENASE 2016 - Proceedings of the 11th International Conference on Evaluation of Novel Software Approaches to Software Engineering, 2016, 396-402 p.Conference paper (Refereed)
    Abstract [en]

    In this paper we address particular aspects of integration of formal methods in large-scale industrial projects, namely collaborative aspects. We review recent works addressing such aspects, identify some current trends and discuss directions for further research. 

  • 4548.
    Zandén, Christoffer
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Danielsson, Martin
    Mälardalen University, School of Innovation, Design and Engineering.
    Produktutveckling av shaker för underlättning av kosttillskottsblandning2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The following report is part of a degree project, carried out by signed M.Sc. students from

    Mälardalen University during the spring term of 2017. The work was carried out at the Bachelor

    of Science degree and comprises 15 credits. The work was carried out at Northpoint AB in

    Västerås, where the students developed a concept on a product that would facilitate dietary

    supplementation mixture. The product that the students developed was a shaker which is a tool

    used for mixing food supplements and liquids.

    The project was conducted on the basis of a specific product development process, where the

    project team chose to apply Ulrich and Eppinger's six phases. In order to ensure scientific quality

    and engineering standards, the project team used product development tools such as the Gantt

    scheme, requirement specification, and concept generation. The project is based on data

    collection conducted according to the qualitative and quantitative methods of research

    methodology.

    The project's problem formulation could be summarized by the following points:

    • When the project was started, there was no easy solution to both separate and mix water

    with dietary supplements.

    • The task of the students was to solve a separator function that can be combined with a

    shaker.

    • The project also included design of an attractive and innovative shaker.

    To solve the problems, the project team studied the theory of product development, ergonomics

    and viands. Based on the theoretical frame of reference studied, product development was

    conducted and resulted in the Eyeris concept where the product combines design and function.

    The result is presented with rendered CAD images, function descriptions, simulations and

    descriptive text. Simulations were performed using SOLIDWORKS injection molding tools as

    well as finite element analysis to provide an indication of whether the resulting concept meets

    the product's purpose.

    The project work's conclusion is that the company's needs were met and the Eyeris concept was

    chosen for further review and prototype production. The project team recommends that a further

    development of the concept should be implemented where function, seal and design are evaluated

    and tested.

  • 4549.
    Zargari Afshar, Sara
    Mälardalen University, School of Innovation, Design and Engineering.
    On Resource Sharing under Multiprocessor Semi-Partitioned Scheduling2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Semi-partitioned scheduling has been the subject of interest compared to conventional global and partitioned scheduling algorithms for multiprocessors due to better utilization results. In Semi-partitioned scheduling most of tasks are assigned to fixed processors while a few number of tasks are split up and allocated to different processors.

    Various techniques have been proposed recently on different assigning protocols under semi-partitioned scheduling. Yet an appropriate synchronization mechanism for resource sharing in semi-partitioned scheduling have not been investigated. In this thesis we propose two methods for handling resource sharing under semi-partitioned scheduling on multiprocessor platforms. The main challenge is handling the resource requests of tasks that are split over multiple processors.

    The solutions include handling non-split tasks as well as split tasks over requests for shared resources in the system. In this thesis we investigate delays caused by blocking on resources. Furthermore, we perform the schedulability analysis for both algorithms.

    Finally we evaluate the performance of our proposed synchronization algorithms by means of experimental evaluations.

  • 4550.
    Zarifnejad, Karwan
    et al.
    Mälardalen University, School of Innovation, Design and Engineering.
    Rantala, Daniel
    Mälardalen University, School of Innovation, Design and Engineering.
    Kommunikation på SANDVIK: Brist i befintligt kommunikationssystem2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
88899091929394 4501 - 4550 of 4684
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