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  • 151.
    Loke, Seng Wai
    et al.
    Monash University, Melbourne, VIC.
    Rakotonirainy, Andry
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Enabling awareness in dynamic mobile agent environments2000Inngår i: Applied computing 2000: proceedings of the 2000 ACM Symposium on Applied Computing, Villa Olmo, Como, Italy, March 19-March 21, 2000, New York: Association for Computing Machinery (ACM), 2000, s. 547-548Konferansepaper (Fagfellevurdert)
  • 152.
    Loke, Seng Wai
    et al.
    CRC for Enterprise Distributed Systems Technology, Monash University.
    Schmidt, Heinz
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Programming the mobility behaviour of agents by composing itineraries1999Inngår i: Advances in Computing Science - ASIAN'99: Proceedings / [ed] Pazhamaneri S. Thiagarajan, Encyclopedia of Global Archaeology/Springer Verlag, 1999, s. 214-226Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present an algebra for programming the itineraries of mobile agents. The algebra contains operators for modelling sequential, parallel, nondeterministic, and conditional mobility behaviour. Iterative behaviour is also modelled by a language of regular itineraries borrowing ideas from regular expressions.We give an operational semantics for the operators using Plotkin-style transition rules and provide examples of itineraries for meeting scheduling, sales order processing, and network modelling.

  • 153.
    Loke, Seng Wai
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Communicative acts of Elvin-enhanced mobile agents2003Inngår i: Proceedings: /WIC International Conference on Intelligent Agent Technology (IAT 2003) : Halifax, Canada, October 13 - 17, 2003 / [ed] Jiming Liu, Los Alamitos, Calif: IEEE Communications Society, 2003, s. 446-449Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Elvin is a scalable and efficient publish-subscribe event notification system. We provide an interpretation, in terms of communicative acts of the Elvin messages that are used by mobile agents in order to utilize Elvin services. We provide a basis for integrating Elvin services within a multi-agent community, i.e. agents can interact with Elvin at the agent communication language level, and show how to implement group communicative acts using Elvin. We believe that the proposed approach enhances agent communication mechanisms with the general-purpose publish-subscribe paradigm.

  • 154.
    Loke, Seng Wai
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Integrated ambient services as enhancement to physical marketplaces2004Inngår i: Proceedings of the 37th Annual Hawaii International Conference on System Sciences: 5 - 8 January 2004, Big Island, Hawaii, [Hilton Waikoloa] ; abstracts and CD-ROM of full papers / [ed] Ralph H. Sprague, Los Alamitos, Calif: IEEE Computer Society Press , 2004, s. 4509-4516Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Ambient services are services that are related to the surrounding physical environment of the user, and can be considered a form of location-based services. Different kinds of ambient shopping services have been developed to aid users including brokerage services, navigational services, comparison shopping, product search, location-based auctions, wireless advertising, and even informational services where a user can point a device to a particular product or shop to find out more about it. With mobile devices, these services are made available at the point when the user needs it, for example, when they are at a shopping mall or in a busy tourist shopping complex. This paper proposes a conceptual framework of how a set of locally useful ambient services can be meaningfully organized based on the user's physical location and intended tasks to enhance a physical marketplace such as a shopping street or a shopping mall. We also outline an architecture for the system and how rule-based service composition can be performed on the client-side.

  • 155.
    Loke, Seng Wai
    et al.
    CRC for Enterprise Distributed Systems Technology, Monash University.
    Zaslavsky, Arkady
    Towards distributed workflow enactment with itineraries and mobile agent management2001Inngår i: E-Commerce Agents: Marketplace Solutions, Security Issues, and Supply and Demand, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2001, s. 283-294Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    Workflow technology is an important area of electronic commerce. The mobile agent paradigm offers a possible abstraction for flexible, adaptive, and dynamically extensible intra- and inter-organizational (even across the Internet) workflow systems. This paper describes two ideas we are exploring for mobile agent based distributed workflow enactment: an algebra of agent itineraries and its correspondence to workflow specifications, and a mobile agent control center for managing agents enacting workflows.

  • 156.
    Loke, Seng
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Jain, B.
    Monash University, Melbourne, VIC.
    Wireless marketing of ephemeral personal goods: the case of auctioning screen estate for wireless advertisements2004Inngår i: Wireless Information Systems: I Proceedings of the 3rd International Workshop on Wireless Information Systems, WIS 2004, In conjunction with ICEIS 2004, Porto, Portugal, April 200 / [ed] Qusay H. Mahmoud; Hans Weghorn, INSTICC Press, 2004Konferansepaper (Annet vitenskapelig)
  • 157. Loke, S.W.
    et al.
    Rakotonirainy, A.
    Zaslavsky, Arkady
    An enterprise viewpoint of wireless virtual communities and the associated uses of software agents2001Inngår i: Internet commerce and software agents: cases, technologies, and opportunities, Hershey: Idea Group Publishing, 2001, s. 265-288Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 158.
    Loke, S.W.
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Itineraries and mobile agent management for distributed workflow enactment1999Inngår i: Intelligent agent technology : systems, methodologies, and tools: proceedings of the 1st Asia-Pacific Conference on IAT ; [held in Hong Kong from 14th to 17th December 1999] / [ed] Jiming Liu, World Scientific and Engineering Academy and Society, 1999, s. 11-20Konferansepaper (Fagfellevurdert)
  • 159. Loke, S.W.
    et al.
    Zaslavsky, Arkady
    Mobile agent supported cooperative work: the ITAG scripting language approach2003Inngår i: Agent supported collaborative work, Boston, Mass.: Encyclopedia of Global Archaeology/Springer Verlag, 2003Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 160. Loke, S.W.
    et al.
    Zaslavsky, Arkady
    The mobile agent as a paradigm for adaptive and extensible distributed workflow1999Inngår i: Proceedings of the Workshop on "AI in Electronic Commerce" (AIEC'99) at the Australian Joint Conference on Artificial Intelligence (AI'99), Sydney, Australia, 1999, s. 15-20Konferansepaper (Fagfellevurdert)
  • 161. Loke, S.W.
    et al.
    Zaslavsky, Arkady
    Yap, B.
    Fonseka, J.
    An itinerary scripting language for mobile agents in enterprise applications2001Inngår i: Intelligent agent technology: research and development ; proceedings of the 2nd Asia-Pacific Conference on AIT, [held in Maebashi, Japan, October 23 - 26, 2001] / [ed] Ning Zhong, World Scientific Publishing Co Pte Ltd , 2001Konferansepaper (Fagfellevurdert)
  • 162. Loke, S.W.
    et al.
    Zaslavsky, Arkady
    Yap, B.
    Fonseka, J.
    Scripting mobile agents to support cooperative work in the 21st century2001Inngår i: Proceedings of the Fifth International Conference on Autonomous Agents: Montreal, Canada May 28 - June 1, 2001 / [ed] Jörg P. Muller, New Uork: ACM Digital Library, 2001, s. 1-10Konferansepaper (Fagfellevurdert)
  • 163. Matskin, M.
    et al.
    Zaslavsky, Arkady
    Incorporating mobility into an agent interoperability -based environment2002Inngår i: Databases and Information Systems II, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2002Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 164. Matskin, Mihhail
    et al.
    Zaslavsky, Arkady
    A scripting language for both agent communication and mobility2002Inngår i: Databases and information systems: proceedings of the fifth international Baltic conference, BalticDB&IS 2002, Tallinn, June 3 - 6, 2002 / [ed] Hele-Mai Haav; A. Kalja, Tallinn University of Technology , 2002Konferansepaper (Fagfellevurdert)
  • 165.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Kodikara, Ruwini
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    A context-aware architecture to facilitate vertical handoffs in 4G networks using multi-homed mobile IP2009Inngår i: The First International Conference on Next Generation Wireless Systems, 2009Konferansepaper (Fagfellevurdert)
  • 166.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    A probabilistic context-aware approach for quality of experience measurement in pervasive systems2011Inngår i: Proceedings of the 26th Annual ACM Symposium on Applied Computing 2011: Taichung, Taiwan, March 21 - 24, 2011, New York: ACM Digital Library, 2011, s. 419-424Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper, we develop a novel context-aware approach for quality of experience (QoE) modeling, reasoning and inferencing in mobile and pervasive computing environments. The proposed model is based upon a state-space approach and Bayesian networks for QoE modeling and reasoning. We further extend this context model to incorporate influence diagrams for efficient QoE inferencing. Our approach accommodates user, device and quality of service (QoS) related context parameters to determine the overall QoE of the user. This helps in user-related media, network and device adaptation. We perform experimentation to validate the proposed approach and the results verify its modeling and inferencing capabilities.

  • 167.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Context-Aware QoE Modelling, Measurement and Prediction in Mobile Computing Systems2015Inngår i: IEEE Transactions on Mobile Computing, ISSN 1536-1233, E-ISSN 1558-0660, Vol. 14, nr 5, s. 920-936Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Quality of Experience (QoE) as an aggregate of Quality of Service (QoS) and human user-related metrics will be the key success factor for current and future mobile computing systems. QoE measurement and prediction are complex tasks as they may involve a large parameter space such as location, delay, jitter, packet loss and user satisfaction just to name a few. These tasks necessitate the development of practical context-aware QoE models that efficiently determine relationships between user context and QoE parameters. In this paper, we propose, develop and validate a novel decision-theoretic approach called CaQoEM for QoE modelling, measurement and prediction. We address the challenge of QoE measurement and prediction where each QoE parameter can be measured on a different scale and may involve different units of measurement. CaQoEM is context-aware and uses Bayesian networks and utility theory to measure and predict users' QoE under uncertainty. We validate CaQoEM using extensive experimentation, user studies and simulations. The results soundly demonstrate that CaQoEM correctly measures range-defined QoE using a bipolar scale. For QoE prediction, an overall accuracy of 98.93\% was achieved using 10-fold cross validation in multiple diverse network conditions such as vertical handoffs, wireless signal fading and wireless network congestion.

  • 168.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Dynamic Bayesian networks for sequential quality of experience modelling and measurement2011Inngår i: Smart Spaces and Next Generation Wired/Wireless Networking: 11th International Conference, NEW2AN 2011, and 4th Conference on Smart Spaces, ruSMART 2011, St. Petersburg, Russia, August 22-25, 2011. Proceedings / [ed] Sergey Balandin; Yevgeni Koucheryavy; Honglin Hu, Encyclopedia of Global Archaeology/Springer Verlag, 2011, s. 135-146Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a novel context-aware methodology for modelling and measuring user-perceived quality of experience (QoE) over time. In particular, we create a context-aware model for QoE modelling and measurement using dynamic Bayesian networks (DBN) and a context-aware state-space approach. The proposed model is then used to infer and determine users’ QoE in a sequential manner. We performed experimentation to validate the proposed model. The results prove thatit can efficiently model, reason and measure QoE of the users’.

  • 169.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Measuring quality of experience in pervasive systems using probabilistic context-aware approach2012Inngår i: Mobile and Ubiquitous Systems: Computing, Networking, and Services: 7th International ICST Conference, MobiQuitous 2010, Sydney, Australia, December 6-9, 2010, Revised Selected Papers, Heidelberg: Encyclopedia of Global Archaeology/Springer Verlag, 2012, s. 330-331Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper, we pioneer a context-aware approach for quality of experience (QoE) modeling, reasoning and inferencing in mobile and pervasive computing environments. The proposed model is based upon Context Spaces Theory (CST) and influence diagrams (IDs) to handle uncertain and hidden complex inter-dependencies between user-perceived and network level QoS and to calculate overall QoE of the users. This helps in user-related media, network and device adaptation, creating user-level SLAs and minimizing network churn. We perform experimentation to validate the proposed approach and the results verify its modeling and inferencing capabilities.

  • 170.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    PRONET: proactive context-aware support for mobility in heterogenous access networks2010Inngår i: 2009 IEEE 34th Conference on Local Computer Networks: LCN 2009 ; Zurich, Switzerland, 20 - 23 October 2009, Piscataway, NJ: IEEE Communications Society, 2010, s. 675-676Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a blueprint for proactive context-aware mobility support architecture for heterogeneous access networks called PROET. In particular, we leverage upon the principles of cognitive networking to support proactive contextawareness for user-centric application adaptation via quality-ofexperience (QoE) provisioning. Our proposed architecture is built upon Port-based Multi-homed Mobile IPv6 (PM-MIPv6) solution to support several applications via path diversity. In this paper our contributions are two-fold. Firstly, we identify and present gaps in our research domain related to mobility, QoE, cognitive networks and cross-layer design. We then present our architecture for providing seamless mobility in heterogeneous access networks. Currently, we are in the process of collecting results via our test bed and prototype implementation for 802.11g and HSDPA wireless networks

  • 171.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    A decision-theoretic approach for quality of experience measurement and prediction2011Inngår i: 2011 IEEE International Conference on Multimedia and Expo, (ICME 2011): Barcelona, Spain, 11 - 15 July 2011 / [ed] Irene Cheng, Piscataway, NJ: IEEE Communications Society, 2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a pioneering context-aware approach for quality of experience (QoE) measurement and prediction. The proposed approach incorporates an intuitive context-aware framework and decision theory. It is capable of incorporating several QoE related classes and context information to correctly measure and predict the overall QoE on a single scale. Our approach can be used in measuring and predicting QoE in both lab and living-lab settings based on user, device and network related context parameters. The predicted QoE can be beneficial for network operators to minimize network churn and can help application developers to build smart user-centric applications. We perform extensive experimentation and the results validate our approach.

  • 172.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Performance evaluation of a decision-theoretic approach for quality of experience measurement in mobile and pervasive computing scenarios2012Inngår i: 2012 IEEE Wireless Communications and Networking Conference (WCNC), Piscataway, NJ: IEEE Communications Society, 2012, s. 2418-2423Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Measuring and predicting users quality of experience (QoE) in dynamic network conditions is a challenging task. This paper presents results related to a decision-theoretic methodology incorporating Bayesian networks (BNs) and utility theory for quality of experience (QoE) measurement and prediction in mobile computing scenarios. In particular, we show how both generative and discriminative BNs can be used to measure and predict users QoE accurately for voice applications under several wireless network conditions such as wireless signal fading, vertical handoffs, wireless network congestion and normal hotspot traffic. Through extensive simulation studies and results analysis, we show that our proposed methodology can achieve an average accuracy of 98.70% using three different types of Bayesian network.

  • 173.
    Mitra, Karan
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Åhlund, Christer
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    QoE estimation and prediction using hidden Markov models in heterogeneous access networks2012Inngår i: 2012 Australasian Telecommunication Networks and Applications Conference: (ATNAC 2012) : Brisbane 7 November - 9 November 2012, Piscataway, NJ: IEEE Communications Society, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Quality of Experience (QoE) based handoffs inheterogeneous access networks (HAN) necessitates accurate QoEestimation and prediction. The current approaches to QoE-awarehandoffs are limited. These approaches either lack the availabilityof underlying probing mechanism or lack the availability ofQoE estimation and prediction mechanism. In this paper, wepropose, develop and validate a novel method for QoE estimationand prediction using passive probing mechanisms. Ourmethod is based on hidden Markov models and multi-homedmobility management protocol. Using extensive simulations andexperimental studies, we show that our method achieves QoEestimation accuracy of 100% and prediction accuracy of 97% inHAN without using additional probe packets for QoE estimationand prediction.

  • 174. Monostori, K.
    et al.
    Schmidt, Heniz
    Zaslavsky, Arkady
    Parallel overlap and similarity detection in semi-structured document collections2000Inngår i: PART '99 : 29 November - 1 December 1999, Melbourne, Australia: [proceedings of the 6th Australasian Conference on Parallel and Real-Time Systems] / [ed] Wilson C.H. Cheng, Encyclopedia of Global Archaeology/Springer Verlag, 2000Konferansepaper (Fagfellevurdert)
  • 175. Monostori, K.
    et al.
    Zaslavsky, Arkady
    Schmidt, H.
    MatchDetectReveal: finding overlapping and similar digital documents2000Inngår i: Challenges of information technology management in the 21st century: 2000 Information Resources Management Association International Conference, Anchorage, Alaska, USA, May 21-24, 2000 / [ed] Mehdi Khosrowpour, Hershey, Pa: Idea Group Publishing, 2000Konferansepaper (Fagfellevurdert)
  • 176.
    Monostori, Krisztián
    et al.
    School of Computer Science & Software Engineering, Monash University Melbourne.
    Finkel, Raphael
    Computer Science, University of Kentucky.
    Zaslavsky, Arkady
    Hodász, Gábor
    Department of Automation and Applied Informatics, Budapest University of Technology and Economic Sciences.
    Pataki, Máté
    Department of Automation and Applied Informatics, Budapest University of Technology and Economic Sciences.
    Comparison of overlap detection techniques2002Inngår i: Computational science: international conference, Amsterdam, the Netherlands, April 21-24, 2002; proceedings / [ed] Peter M. A. Sloot, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2002, s. 51-60Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Easy access to the World Wide Web has raised concerns about copyright issues and plagiarism. It is easy to copy someone else's work and submit it as someone's own. This problem has been targeted by many systems, which use very similar approaches. These approaches are compared in this paper and suggestions are made when different strategies are more applicable than others. Some alternative approaches are proposed that perform better than previously presented methods. These previous methods share two common stages: chunking of documents and selection of representative chunks. We study both stages and also propose alternatives that are better in terms of accuracy and space requirement. The applications of these methods are not limited to plagiarism detection but may target other copy-detection problems. We also propose a third stage to be applied in the comparison that uses suffix trees and suffix vectors to identify the overlapping chunks

  • 177.
    Monostori, Krisztián
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Schmidt, Heinz
    Monash University, Melbourne, VIC.
    Digital documents in educational environment: misuse, appropriation and detection issues2000Konferansepaper (Annet vitenskapelig)
  • 178.
    Monostori, Krisztián
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Schmidt, Heinz
    Monash University, Melbourne, VIC.
    Document overlap detection system for distributed digital libraries2000Inngår i: ACM 2000 digital libraries: proceedings of the Fifth ACM Conference on Digital Libraries ; June 2 - 7, 2000, San Antonio, Texas, USA, New York, NY: Association for Computing Machinery (ACM), 2000, s. 226-227Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper we introduce the MatchDetectReveal(MDR) system, which is capable of identifying overlapping and plagiarised documents. Each component of the system is briefly described. The matching-engine component uses a modified suffix tree representation, which is able to identify the exact overlapping chunks and its performance is also presented.

  • 179.
    Monostori, Krisztián
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Schmidt, Heinz
    Monash University, Melbourne, VIC.
    Efficiency of data structures for detecting overlaps in digital documents2001Inngår i: Australian Computer Science Communications, ISSN 0157-3055, Vol. 23, nr 1, s. 140-147Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper analyses the efficiency of different data structures for detecting overlap in digital documents. Most existing approaches use some hash function to reduce the space requirements for their indices of chunks. Since a hash function can produce the same value for different chunks, false matches are possible. In this paper we propose an algorithm that can be used for eliminating those false matches. This algorithm uses a suffix tree structure, which is space consuming. We define a modified suffix tree that only considers chunks starting at the beginning of words and we show how the algorithm can work on this structure. We can alternatively reduce space requirements of a suffix tree by converting it to a directed acyclic graph. We show that suffix link information can be preserved in this new structure and the matching statistics algorithm still works with those modifications that we propose.

  • 180.
    Monostori, Krisztián
    et al.
    School of Computer Science & Software Engineering, Monash University Melbourne.
    Zaslavsky, Arkady
    Schmidt, Heinz
    School of Computer Science & Software Engineering, Monash University Melbourne.
    Parallel and distributed document overlap detection on the web2000Inngår i: Applied Parallel Computing: new paradigms for HPC in industry and academia ; 5th international workshop, Bergen, Norway, June 18 - 20, 2000 ; proceedings / [ed] Tor Sørevik, New York: Encyclopedia of Global Archaeology/Springer Verlag, 2000, s. 206-214Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Proliferation of digital libraries plus availability of electronic documents from the Internet have created new challenges for computer science researchers and professionals. Documents are easily copied and redistributed or used to create plagiarised assignments and conference papers. This paper presents a new, two-stage approach for identifying overlapping documents. The first stage is identifying a set of candidate documents that are compared in the second stage using a matching-engine. The algorithm of the matching-engine is based on suffix trees and it modifies the known matching statistics algorithm. Parallel and distributed approaches are discussed at both stages and performance results are presented.

  • 181.
    Monostori, Krisztián
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Schmidt, Heinz
    Monash University, Melbourne, VIC.
    Suffix vector: space- and time-efficient alternative to suffix trees2002Inngår i: Australian Computer Science Communications, ISSN 0157-3055, Vol. 24, nr 1, s. 157-165Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Suffix trees are versatile data structures that are used for solving many string-matching problems. One of the main arguments against widespread usage of the structure is its space requirement. This paper describes a new structure called suffix vector, which is not only better in terms of storage space but also simpler than the most efficient suffix tree representation known to date. Alternatives of storage representations are discussed and a linear-time construction algorithm is also proposed in this paper. Space requirement of the suffix vector structure is compared to the space requirement of alternative suffix tree representations. We also make a theoretical comparison on the number of operations required to run algorithms on the suffix vector.

  • 182.
    Monostori, Krisztián
    et al.
    School of Computer Science & Software Engineering, Monash University Melbourne.
    Zaslavsky, Arkady
    Vajk, István
    Budapest University of Technology and Economics.
    Suffix vector: a space-efficient suffix tree representation2001Inngår i: Algorithms and Computation: 12th International Symposium, ISAAC 2001 Christchurch, New Zealand, December 19-21, 2001 Proceedings / [ed] Peter Eades; Tadao Takaoka, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2001, s. 707-718Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper introduces a new way of representing suffix trees. The basic idea behind the representation is that we are storing the nodes of the tree along with the string itself, thus edge labels can directly be read from the string. The new representation occupies less space than the best-known representation to date in case of English text and program files, though it requires slightly more space in case of DNA sequences. We also believe that our representation is clearer and thus implementing algorithms on it is easier. We also show that our representation is not only better in terms of space but it is also faster to retrieve information from the tree. We theoretically compare the running time of the matching statistics algorithm on both representations.

  • 183. Ng, Alexander
    et al.
    Zaslavsky, Arkady
    Location awareness and adaptable multilayer security in enterprise applications2002Inngår i: M-Business 2002: evolution sceniarios for emerging mobile commerce services ; the 1st International Conference on Mobile Business ; 8 - 9 July 2002, Athens, Greece, Athens, 2002Konferansepaper (Fagfellevurdert)
  • 184. Ng, Alexander
    et al.
    Zaslavsky, Arkady
    Location awareness and privacy in pervasive applications and their impact on resource constraints2002Inngår i: Enabling organisations and society through information systems: proceedings of the Thirteenth Australasian Conference on Information Systems, 4 - 6 December 2002, Melbourne, Australia / [ed] Andrew Wenn, School of information systems , 2002Konferansepaper (Fagfellevurdert)
  • 185. Nzama, M.
    et al.
    Zaslavsky, Arkady
    Data intensive applications on mobile computing platforms1998Inngår i: International Conference on Computational Intelligence and Multimedia Applications 1998: ICCIMA 1998 ; [held on 9-11 February 1998 in Gippsland, Victoria, Australia] / [ed] Henry Selvaraj, Singapore: World Scientific and Engineering Academy and Society, 1998Konferansepaper (Fagfellevurdert)
  • 186. Nzama, Mqhele
    et al.
    Stanski, Peter
    Zaslavsky, Arkady
    ET effect in computing world1997Inngår i: Proceedings on the 2nd Australian Workshop on Mobile Computing and Databases and Applications, Monash University , 1997, s. 37-45Konferansepaper (Fagfellevurdert)
  • 187. Nzama, Mqhele
    et al.
    Zaslavsky, Arkady
    Supporting distributed collaboration in mobile computing environments1998Inngår i: Proceedings for the 1st Ann. South African Telecommunications, Networks and Applications Conference (SATNAC), University of Cape Town Press, 1998Konferansepaper (Fagfellevurdert)
  • 188.
    Nzama, Mqhele
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Ng, Alexander
    Monash University, Melbourne, VIC.
    Adaptive delivery of multimedia data in heterogeneous and mobile environments2001Inngår i: Mobile data management: second international conference ; proceedings / MDM 2001, Hong Kong, China, January 8 - 10, 2001 / [ed] Kian-Lee Tan, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2001, s. 41-52Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper discusses the sources of variability in heterogeneous and mobile networks that make it difficult for traditional applications to work properly. The problems associated with delivering multimedia content to clients of varying capabilities are also investigated. Adaptivity is presented as a tool to extend the lifetime of critical applications as well as a technique to meet client device variability. To this end we have developed prototypes for the mobile environments that aim to reduce dependency on scarce resources. The adaptation space framework is used to provide a flexible and consistent design strategy

  • 189.
    Padovitz, A.
    et al.
    Centre for Distributed Systems and Software Engineering, Monash University.
    Loke, Seng Wai
    Department of Computer Science and Computer Engineering, La Trobe University.
    Zaslavsky, Arkady
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Multiple-agent perspectives in reasoning about situations for context-aware pervasive computing systems2008Inngår i: IEEE transactions on systems, man and cybernetics. Part A. Systems and humans, ISSN 1083-4427, E-ISSN 1558-2426, Vol. 38, nr 4, s. 729-742Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In open heterogeneous context-aware pervasive computing systems, suitable context models and reasoning approaches are necessary to enable collaboration and distributed reasoning among agents. This paper proposes, develops, and demonstrates the following: 1) a novel context model and reasoning approach developed with concepts from the state-space model, which describes context and situations as geometrical structures in a multidimensional space; and 2) a context algebra based on the model, which enables distributed reasoning by merging and partitioning context models that represent different perspectives of computing entities over the object of reasoning. We show how merging and reconciling different points of view over context enhances the outcomes of reasoning about the context. We develop and evaluate our proposed algebraic operators and reasoning approaches with cases using real sensors and with simulations. We embed agents and mobile agents with these modeling and reasoning capabilities, thus facilitating context-aware and adaptive mobile agents operating in open pervasive environments.

  • 190.
    Padovitz, A.
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Loke, Seng Wai
    Monash University, Melbourne, VIC.
    Awareness and agility for autonomic distributed systems: platform-independent and publish-subscribe event-based communication for mobile agents2003Inngår i: Proceedings: 14th International Workshop on Database and Expert Systems Applications : 1 - 5 September 2003, Prague, Czech Republic, Los Alamitos, Calif: IEEE Communications Society, 2003, s. 669-673Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose using the publish-subscribe model to complement proprietary or standard agent communication languages, useful particularly in the case of exchanging and disseminating short communications about events and consequently, reducing complexity of multi-agent messaging. We describe how we implemented the event notification mechanism for mobile agents, and analyse experiments that demonstrate the Elvin-based event notification mechanism for communication between Grasshopper agents and aglets. We also discuss message loss due to agent migration and offer solutions to reliable communication between mobile agents using events.

  • 191.
    Padovitz, Amir
    et al.
    Monash University, Melbourne, VIC.
    Loke, Seng Wai
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    On uncertainty in context-aware computing: appealing to high-level and same-level context for low-level context verification2004Inngår i: Proceedings of the 1st International Workshop on Ubiquitous Computing, IWUC 2004 / [ed] S.K Mostefaoui; Z. Maamar; O. Rana, INSTICC Press, 2004, s. 62-72Konferansepaper (Fagfellevurdert)
    Abstract [en]

    There is an inherent chasm between the real-world and the world that can be perceived by computer systems, yielding uncertainty and ambiguity in system perceived context, with consequent effect on the performance of context-aware systems. While the problem is complex in depth and breadth, we explore an approach where context is characterized at different levels of abstraction, and where contextual information at high-levels of abstraction and sensed context at low-levels of abstraction can be used to validate and correct low-level sensed context such as location. We describe a randomly generated simulation of locations that might be sensed by a positioning technology, and how our approach can be used to validate and correct the sensed locations.

  • 192.
    Padovitz, Amir
    et al.
    Monash University, Melbourne, VIC.
    Loke, Seng Wai
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Towards a theory of context spaces2004Inngår i: Proceedings, second IEEE annual Conference on Pervasive Computing and Communications : Orlando, Florida, March 14-17, 2004: Orlando, Florida, March 14 - 17, 2004, Los Alamitos, Calif: IEEE Computer Society Press , 2004, s. 38-42Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose initial work on a conceptual framework for context-aware systems, towards a general context model to aid thinking, describing, manipulating and utilizing context. Much work on context-aware computing have utilized context in specialized applications, with application-specific software (and perhaps hardware) and specialized context representation and manipulation. Context-aware systems are becoming increasingly important, and emerging research has begun to look at context-aware systems more generally, independently of specific applications, including context middleware and toolkits and ontologies for describing context.

  • 193.
    Padovitz, Amir
    et al.
    School of Computer Science & Software Engineering, Monash University Melbourne.
    Loke, Seng Wai
    School of Computer Science & Software Engineering, Monash University Melbourne.
    Zaslavsky, Arkady
    Using the publish-subscribe communication genre for mobile agents2003Inngår i: Multiagent System Technologies: first German conference ; proceedings / MATES 2003, Erfurt, Germany, September 22 - 25, 2003 / [ed] Michael Schillo, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2003, s. 180-191Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We advocate the event-based communication genre for mobile agent communities, which is useful for exchanging and disseminating large volumes of small lightweight messages. We propose that the publish-subscribe model complements the proprietary or standard agent communication languages. We describe how we implemented the event notification mechanism for mobile agents, and analyse experiments that demonstrate the Elvin-based event notification mechanism for communication between heterogeneous agents, in particular, Grasshopper agents and Aglets. We also discuss experiments for measuring message losses due to agent migration.

  • 194.
    Padovitz, Amir
    et al.
    Monash University, Melbourne, VIC.
    Loke, Seng Wai
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Burg, Bernard
    Monash University, Melbourne, VIC.
    Towards a general approach for reasoning about context situations and uncertainty in ubiquitous sensing: putting geometrical intuitions to work2004Inngår i: Ubiquitous computing systems: second international symposium, UCS 2004, Tokyo, Japan, November 8-9, 2004 : revised selected papers, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2004Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Context uncertainty and the incurred complexity of reasoning about context necessitate investigation of context awareness that would provide feasible solutions by means of models, architectures and algorithms. In this paper we discuss our approach for reasoning about context under uncertain conditions in pervasive environments and explore the theory, design and implementation of a reasoning engine, which makes use of a novel modeling approach for describing and reasoning about context. We discuss both a theory, which is the basis for the reasoning processes as well as analyze the functional activity of the reasoning engine during experimentation.

  • 195.
    Padovitz, Amir
    et al.
    Centre for Distributed Systems and Software Engineering.
    Loke, Seng Wai
    Centre for Distributed Systems and Software Engineering.
    Zaslavsky, Arkady
    Burg, Bernard
    HP Labs, Palo-Alto.
    Bartolini, Claudio
    HP Labs, Palo-Alto.
    An approach to data fusion for context awareness2005Inngår i: Modeling and Using Context: 5th International and Interdisciplinary Conference CONTEXT 2005, Paris, France, July 5-8, 2005. Proceedings / [ed] Anind Dey; Boicho Kokinov; David Leake; Roy Turner, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2005, s. 353-367Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We propose and develop an approach modeled with multi-attribute utility theory for sensor fusion in context-aware environments. Our approach is distinguished from existing general purpose fusion techniques by a number of factors including a general underlying context model it is built upon and a set of heuristics it covers. The technique is developed for context-aware applications and we argue that it provides various advantages for data fusion in context-aware scenarios. We experimentally evaluate our approach with actual use cases using real sensors.

  • 196.
    Padovitz, Amir
    et al.
    Centre for Distributed Systems and Software Engineering, Monash University.
    Zaslavsky, Arkady
    Loke, Seng Wai
    Centre for Distributed Systems and Software Engineering, Monash University.
    Merging context perspectives: an approach to adaptive agent reasoning in pervasive computing systems2006Inngår i: Proceedings, Fourth Annual IEEE International Conference on Pervasive Computing and Communications workshops: March 13 - 17, 2006, Pisa, Italy, Los Alamitos, Calif: IEEE Computer Society Press , 2006, s. 612-615Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In open, heterogeneous, context-aware pervasive computing systems, suitable context models and reasoning approaches are necessary to enable collaboration and distributed reasoning among agents. This paper proposes, develops and demonstrates a novel approach to perform distributed reasoning by merging and partitioning context models that represent different perspectives over the object of reasoning. We show how merging different points of view contributes to an enhanced outcome in reasoning about context.

  • 197.
    Padovitz, Amir
    et al.
    School of Computer Science & Software Engineering, Monash University Melbourne.
    Zaslavsky, Arkady
    Loke, Seng Wai
    School of Computer Science & Software Engineering, Monash University Melbourne.
    Burg, Bernard
    HP Labs, Palo-Alto.
    Maintaining continuous dependability in sensor-based context-aware pervasive computing systems2005Inngår i: Proceedings of the 38th Annual Hawaii International Conference on System Sciences: 3 - 6 January 2005, Big Island, Hawaii / [ed] Ralph H. Sprague, Los Alamitos, Calif: IEEE Computer Society Press , 2005, s. 290-299Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Sensors are often indicative of events of interest, or events which a system should be aware of and should react to. In particular, such indications may reflect unsteadiness or instability with respect to the current contextual situation. This paper discusses the concepts of stability and instability in context-aware systems, and suggests a model, methodology and an algorithm for real-time analysis of sensor readings in order to estimate future changes in context as well as in assisting to maintain the proper functioning of context-aware pervasive systems. We provide a conceptual analysis of our approach, implementation details and experimental evaluation of simulated scenarios that are part of a motivating use case.

  • 198.
    Padovitz, Amir
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Loke, Seng Wai
    Monash University, Melbourne, VIC.
    Tosic, Milovan
    Monash University, Melbourne, VIC.
    Agent communication using publish-subscribe genre: architecture, mobility, scalability and applications2004Inngår i: Annals of Mathematics, Computing and Teleinformatics, ISSN 1109-9305, Vol. 1, nr 2, s. 35-50Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Mobile agent communication in multi-agent communities is still very much a research challenge. We analyze and discuss the suitability of current technologies for interconnecting heterogeneous agent platforms and multi-agent systems and propose a publish-subscribe, or in other words, event notification mechanism as an efficient and effective complementary solution to software mobile agent communication. We advocate the event-based communication genre for exchanging and disseminating large volumes of small lightweight messages. We discuss our work in that area towards building content- and context-based messaging for agent communication, i.e. the ability to refer to and send messages to a collection of agents based on their current context, without knowing the precise identities of the agents. We investigate the feasibility of this paradigm and offer our perspective on the future of agent communication in large scale, distributed multi-agent systems.

  • 199.
    Padowitz, Amir
    et al.
    Centre for Distributed Systems and Software Engineering, Monash University.
    Loke, Seng Wai
    Department of Computer Science and Computer Engineering Bundoora.
    Zaslavsky, Arkady
    The ECORA framework: A hybrid architecture for context-oriented pervasive computing2008Inngår i: Pervasive and Mobile Computing, ISSN 1574-1192, E-ISSN 1873-1589, Vol. 4, nr 2, s. 182-215Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An infrastructure approach to support context-aware pervasive computing is advantageous for rapid prototyping of context-aware distributed applications and beneficial for unifying modelling of context and reasoning in uncertain conditions. This paper presents the ECORA framework for context-aware computing, which is designed with a focus on reasoning about context under uncertainty and addressing issues of heterogeneity, scalability, communication and usability. The framework follows an agent-oriented hybrid approach, combining centralized reasoning services with context-aware, reasoning capable mobile software agents. The use of a centralized reasoning engine provides powerful reasoning capabilities and deploying context-aware mobile agents enables agility and robustness of components in the pervasive system. The design and implementation of the framework at different levels, as well as three case studies, are presented.

  • 200.
    Page, John
    et al.
    Monash University, Melbourne, VIC.
    Zaslavsky, Arkady
    Indrawan, Maria
    Monash University, Melbourne, VIC.
    A buddy model of security for mobile agent communities operating in pervasive scenarios2004Inngår i: ACSW frontiers 2004: proceedings of the Australasian Information Security Workshop (AISW 2004), the Australasian Workshop on Data Mining and Web Intelligence (DMWI 2004), the Australasian Workshop on Software Internationalisation (AWSI 2004), Dunedin, New Zealand, January 2004 / [ed] James Hogan, Sydney: Australian Computer Society, 2004, s. 17-25Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper examines the security aspects of different pervasive scenarios involving agent communities evolved using multi agent systems (MAS). It describes the motivation and the objectives behind the development of these agent communities and analyses the security vulnerabilities, which arise within them. To counter these vulnerabilities, the paper proposes a Buddy model of security for the agent community. In this model, every agent protects its neighbour within the community, thereby sharing the responsibilities of the security function. This feature makes it a better option as compared to other hierarchical models of security, which can be brought down by a concerted attack at the controller agent. This paper also demonstrates the applicability and the effectiveness of the Buddy model in different pervasive scenarios and makes a strong case for its adoption.

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