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Real-Time systems Symposium (RTSS)

作者： A. Mink W. Salamon J.K. Hollingsworth R. Arunachalam Scalable Parallel Systems Group Information Technology Laboratory National Institute for Standards and Technology Gaithersburg MD USA Computer Science Department University of Maryland College Park MD USA

We present the design and implementation of MultiKron PCI, a hardware performance monitor that can be plugged into any computer with a free PCI bus slot. The monitor provides a series of high-resolution timers, and the ability to monitor the utilization of the PCI bus. We also demonstrate how the monitor can be integrated with online performance monitoring tools such as the Paradyn parallel performance measurement tools to improve the overhead of key timer operations by a factor of 25. In addition, we present a series of case studies using the MultiKron hardware performance monitor to measure and tune high-performance parallel completing applications. By using the monitor, we were able to find and correct a performance bug in a popular implementation of the MPI message passing library that caused some communication primitives to run at one half their potential speed.

关键词： Measurement Hardware computerized monitoring Performance evaluation NIST Debugging Timing Runtime Counting circuits Clocks

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A Taxonomy of Pervasive Healthcare systems

A Taxonomy of Pervasive Healthcare Systems

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International Conference on Pervasive Computing Technologies for Healthcare, PervasiveHealth

作者： Joanna Alicja Muras Vinny Cahill Emma Katherine Stokes Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland Department of Physiotherapy School of Medicine Trinity College Dublin Trinity Centre for Health Sciences Dublin Ireland

Pervasive computing is a developing area. Due to significant technological developments, assistive devices that were impossible to make or that were not even considered for manufacture are now available. The creation of novel smart environments, context-aware assistive devices, and activity monitoring systems have the capacity to provide people with great opportunities to improve their quality of life and increase independence in daily living. These advances in information and communications technology run in parallel to developments in medicine, physiotherapy and psychology. To enable the design of increasingly advanced user-centred systems, dialogue between computer scientists and health care professionals is mandatory. In order to create a framework for dialogue, this paper presents a novel taxonomy of pervasive health care systems. The taxonomy extends the International Classification of Functioning, Disability and Health, which provides standard language and a framework for the description of health and health-related domains. The taxonomy is structured as a hierarchy of the properties of pervasive healthcare systems and can be used as a framework for system classification. It identifies a set of fundamental properties that enable a system to be described according to its user's characteristics, its purpose and environment of use, as well as the technologies employed

关键词： Taxonomy Medical services Pervasive computing Smart homes Educational institutions Monitoring Communications technology Psychology Intelligent sensors Switches

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Enforcing integrity of agent migration paths by distribution of trust

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International Journal of Intelligent Information and Database systems 2009年第4期3卷 382-396页

作者： Warnier, Martijn Oey, Michel Timmer, Reinier Brazier, Frances Overeinder, Benno Intelligent Interactive Distributed Systems Group Department of Computer Science VU University Amsterdam de Boelelaan 1081a 1081 HV Amsterdam Netherlands NLnet Labs Kruislaan 419 1098 VA Amsterdam Netherlands

Agent mobility is the ability of an agent to migrate from one location to another across a network. Though conceptually relatively straightforward, in practice security of mobile agents is a challenge: from transport layer security to preservation of integrity in open environments. This paper discusses the security issues involved and proposes protocols for secure agent migration. AgentScape, an agent platform for mobile agents, is used to illustrate the feasibility of the implementation of these protocols. Copyright © 2009 nderscience Enterprises Ltd.

关键词： Mobile agents

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A brief Introduction to MOSEL-2

A brief Introduction to MOSEL-2

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13th GI/ITG Conference - Measuring, Modelling and Evaluation of computer and Communication systems

作者： Patrick Wuechner Hermann de Meer Joerg Barner Gunter Bolch Chair of Computer Networks and Computer Communications Faculty of Mathematics and Computer Science University of Passau Innstr. 33 94032 Passau Germany Research Group on Analytical Modeling Chair of Distributed Systems and Operating Systems Department of Computer Science University of Erlangen-Nürnberg Martensstr. 1 91058 Germany

The versatile MOdeling, Specification and Evaluation Language is the core element of the MOSEL-2 tool. This description languages provides a high-level means for specifying models, performance measures, and the graphical presentation of results. The description languages is implemented in form of an evaluation environment that comprises translators to the modeling languages of several third-party performance evaluation tools that evaluate the specified model.

关键词： Numerical models Computational modeling Stochastic processes Mathematical model Analytical models computer performance Performance evaluation

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A peer-to-peer mechanism for resource location and allocation over the grid

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3358卷 604-614页

作者： Hsiao, Hung-Chang Baker, Mark King, Chung-Ta Computer and Communication Research Center National Tsing-Hua University 300 Taiwan Distributed Systems Group University of Portsmouth PO1 2EG United Kingdom Department of Computer Science National Tsing-Hua University 300 Taiwan

Recent advances in P2P lookup overlays provide an appealing solution for distributed search without relying on a single database server. In addition to performing resource discovery, these P2P substrates also offer membership management for dynamic peers. In this paper, we propose a publicly shared architecture called VC2A that takes advantage of a P2P lookup substrate for computational applications. VC2A targets computational master-slave applications. An application running in VC2A dynamically allocates resources from the system on the fly. These allocated resources then self-manage and -heal. We have implemented an architecture based on our previous efforts that include an enhanced P2P lookup overlay and a mobile agent system on top of this overlay. We show that VC2A is not only scalable but robust, and takes advantage of heterogeneity of the resources. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Substrates

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Automated detection of performance regressions: the mono experience

Automated detection of performance regressions: the mono exp...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication systems (MASCOTS)

作者： T. Kalibera L. Bulej P. Tuma Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Prague Czech Republic Institute of Computer Science Academy of Sciences of Czech Republic Czech Republic

Engineering a large software project involves tracking the impact of development and maintenance changes on the software performance. An approach for tracking the impact is regression benchmarking, which involves automated benchmarking and evaluation of performance at regular intervals. Regression benchmarking must tackle the nondeterminism inherent to contemporary computer systems and execution environments and the impact of the nondeterminism on the results. On the example of a fully automated regression benchmarking environment for the mono open-source project, we show how the problems associated with nondeterminism can be tackled using statistical methods.

关键词： MONOS devices Benchmark testing Software performance Software testing Software quality Quality assurance Automatic testing Robustness Performance analysis Software engineering

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Using English as pivot to extract Persian-Italian parallel sentences from non-parallel corpora

arXiv

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arXiv 2017年

作者： Ansari, Ebrahim Sadreddini, M.H. Sheikhalishahi, Mostafa Wallace, Richard Alimardani, Fatemeh Zanjan Iran Department of Computer Science and Engineering Shiraz University Shiraz Iran Department of Mathematics and Informatics University of Calabria Rende Italy Distributed Systems Architecture Research Group Complutense University Madrid Spain

The effectiveness of a statistical machine translation system (SMT) is very dependent upon the amount of parallel corpus used in the training phase. For low-resource language pairs there are not enough parallel corpora to build an accurate SMT. In this paper, a novel approach is presented to extract bilingual Persian-Italian parallel sentences from a non-parallel (comparable) corpus. In this study, English is used as the pivot language to compute the matching scores between source and target sentences and candidate selection phase. Additionally, a new monolingual sentence similarity metric, Normalized Google Distance (NGD) is proposed to improve the matching process. Moreover, some extensions of the baseline system are applied to improve the quality of extracted sentences measured with BLEU. Experimental results show that using the new pivot based extraction can increase the quality of bilingual corpus significantly and consequently improves the performance of the Persian-Italian SMT system. Copyright © 2017, The Authors. All rights reserved.

关键词： computer aided language translation

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Towards software-defined-networking-based IoT: A systematic literature review on management frameworks and open challenges

TechRxiv

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TechRxiv 2021年

作者： Siddiqui, Shahbaz Hameed, Sufian Shah, Syed Attique Ahmad, Ijaz Draheim, Dirk Dustdar, Schahram The Department of Computer Science NUCES Karachi75160 Pakistan The Data Systems Group Institute of Computer Science University of Tartu Delta Centre Narva mnt 18-3123 Tartu51009 Estonia The VTT Technical Research Centre of Finland Finland The Information Systems Group Tallinn University of Technology Akadeemia tee 15a Tallinn12618 Estonia The Distributed Systems Group TU Wien Austria

Internet of Things (IoT) is characterized as one of the leading actors for the next evolutionary stage in the computing world. IoT-based applications have already produced a plethora of novel services and are improving the living standard by enabling innovative and smart solutions. However, along with its rapid adoption, IoT technology also creates complex challenges regarding the management of IoT networks due to its resource limitations (computational power, energy, and security). Hence, it is urgently needed to refine the IoT-based application’s architectures to robustly manage the overall IoT infrastructure. Software-defined networking (SDN) has emerged as a paradigm that offers software-based controllers to manage hardware infrastructure and traffic flow on a network effectively. SDN architecture has the potential to provide efficient and reliable IoT network management. This research provides a comprehensive survey investigating the published studies on SDN-based frameworks to address IoT management issues in the dimensions of fault tolerance, energy management, scalability, load balancing, and security service provisioning within the IoT networks. We conducted a Systematic Literature Review (SLR) on the research studies (published from 2010 to 2021) focusing on SDN-based IoT management frameworks. We provide an extensive discussion on various aspects of SDN-based IoT solutions and architectures. We elaborate a taxonomy of the existing SDN-based IoT frameworks and solutions by classifying them into categories such as network function virtualization, middleware, OpenFlow adaptation, and blockchain-based management. We present the research gaps by identifying and analyzing the key architectural requirements and management issues in IoT infrastructures. Finally, we highlight various challenges and a range of promising opportunities for future research to provide a roadmap for addressing the weaknesses and identifying the benefits from the potentials offered by SD

关键词： Software defined networking

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Regression benchmarking with simple middleware benchmarks

Regression benchmarking with simple middleware benchmarks

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： L. Bulej T. Kalibera P. Tuma Distributed Systems Research Group Department of Software Engineering Charles University Prague Czech Republic Institute of Computer Science Academy of Sciences슠of the슠Czech Republic Prague Czech Republic

The paper introduces the concept of regression benchmarking as a variant of regression testing focused at detecting performance regressions. Applying the regression benchmarking in the area of middleware development, the paper explains how regression benchmarking differs from middleware benchmarking in general. On a real-world example of TAO, the paper shows why the existing benchmarks do not give results sufficient for regression benchmarking, and proposes techniques for detecting performance regressions using simple benchmarks.

关键词： Middleware Benchmark testing Software testing System testing Quality assurance Software systems Software engineering Mathematics Physics computer science

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Local Bayesian Regularisation of Parsimonious Neurofuzzy Models for Real World Dynamic Processes

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IFAC Proceedings Volumes 1998年第4期31卷 17-22页

作者： K.M. Bossley M. Brown C.J. Harris Parallel Applications Centre 2 Venture Road Chilworth Southampton SO16 7NP UK Image Speech and Intelligent Systems Research Group Department of Electronics and Computer Science University of Southampton SO17 IBJ UK

By combining properties of fuzzy systems and neural networks, neurofuzzy modelling is ideally suited to many system identification and data modelling applications. Recently, data-driven model construction algorithms have been developed to identify these models. These algorithms have proved essential for producing accurate parsimonious models. However, due to problems with sparse data and restricted model structures, models with high model variance are often produced. Thus resulting in models which generalise poorly. In this paper local Bayesian inference techniques are applied to neurofuzzy models, multiple prior probability density functions are placed on the weights and superfluous model variance is controlled. This gives a form of regularisation where Bayesian estimation produces simple re-estimation formulae which identify a suitable bias/variance balance from the data. This approach is considered a post-processing step to model construction, the merits of which are demonstrated by the application to a real world data set.

关键词： System identification neural networks fuzzy logic regularisation

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