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IEEE Symposium on High-Performance computer architecture

作者： Guihai Yan Yingmin Li Yinhe Han Xiaowei Li Minyi Guo Xiaoyao Liang State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China Department of Computer Science and Engineering Shanghai Jiaotong University China

The widening gap between the fast-increasing transistor budget but slow-growing power delivery and system cooling capability calls for novel architectural solutions to boost energy efficiency. Leveraging the fact of surging “dark silicon” area, we propose a hybrid scheme to use both on-chip and off-chip voltage regulators, called “AgileRegulator”, for a multicore system to explore both coarse-grain and fine-grain power phases. We present two complementary algorithms: Sensitivity-Aware Application Scheduling (SAAS) and Responsiveness-Aware Application Scheduling (RAAS) to maximally achieve the energy saving potential of the hybrid regulator scheme. Experimental results show that the hybrid scheme achieves performance-energy efficiency close to per-core DVFS, without imposing much design cost. Meanwhile, the silicon overhead of this scheme is well contained into the “dark silicon”. Unlike other application specific schemes based on accelerators, the proposed scheme itself is a simple and universal solution for chip area and energy trade-offs.

关键词： System-on-a-chip Regulators Silicon Bandwidth Memory management Tuning Multicore processing

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From AUTOSAR Models to Co-simulation for MiL-Testing in the Automotive Domain

From AUTOSAR Models to Co-simulation for MiL-Testing in the ...

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International Conference on Software Testing, Verification, and Validation, ICST

作者： Marcus Mews Jaroslav Svacina Stephan Weißleder Department of Software Engineering and Theoretical Computer Science Technische Universität Berlin Germany Fraunhofer-Institute for Computer Architecture and Software Technology FIRST Berlin Germany

Models in testing are important for describing, understanding, and managing tests. In the automotive domain, AUTOSAR is an important standard to model components of electronic control units. AUTOSAR, however, lacks information about tests or test scenarios. Early testing in the automotive domain is often done by Model-in-the-Loop simulation. Simulations of several components are run in different environments, each. Thus, they need to be connected (co-simulated) for integration testing of these components, e.g., via simulator coupling. This paper is focused on closing the gap between AUTOSAR models and co-simulation-based test scenarios that use simulator coupling. Our main contribution is the definition of a modeling language to describe test environments. The instances of this language can be derived from existing AUTOSAR models and can also be used to automatically generate co-simulation-based test environments. Furthermore, we provide a workflow to integrate this model in the engineering process and an experiment report to demonstrate the applicability and the advantages of the approach.

关键词： Testing Software Automotive engineering Couplings Connectors Adaptation models Data models

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Ar-CHI-Tecture: architecture and interaction

Ar-CHI-Tecture: Architecture and interaction

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30th ACM Conference on Human Factors in Computing Systems, CHI 2012

作者： Dalton, Nicholas Green, Keith Marshall, Paul Dalton, Ruth Hoelscher, Christoph Mathew, Anijo Kortuem, Gerd Varoudis, Tasos Department of Computing Open University Milton Keyens United Kingdom Holcombe Department of Computer Engineering Clemson University Clemson SC 29634 United States UCL Interaction Centre University College London Gower Street London United Kingdom Department of Architecture Northumbria University Newcastle United Kingdom Center for Cognitive Science Institute of Computer Science Social Research Friedrichstr. 50 D-79098 Freiburg Germany Illinois Institute of Technology Chicago IL United States Bartlett School of Architecture University College London Gower Street London United Kingdom

ISBN: (纸本)9781450310161

The rise of ubiquitous computing leads to a natural convergence between the areas of architectural design (the design of buildings, spaces and experience of being in and moving through them) and HCI. We suggest that architecture and CHI have much to learn from each other in terms of research and practice. This workshop will bring together these communities to explore the benefits of architecture envisioned as integral to an expanded CHI community. The workshop organizers aim to create a framework for future collaboration and identify new directions for research in this multidisciplinary field. This promises significant impacts on both interaction research and its real-world applications. © 2012 Authors.

关键词： Ubiquitous computing

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Image recognition with extension of neighborhood preserving embedding on matrices

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Journal of Information and Computational science 2012年第6期9卷 1511-1520页

作者： Zhang, Daming Liu, Huayong Li, Lu Luo, Bin Department of Mathematics and Physics Anhui Institute of Architecture and Industry Hefei 230022 China School of Computer Science and Technology Anhui University Hefei 230039 China

Neighborhood Preserving Embedding (NPE) is a novel subspace learning algorithm, which aims at preserving the local neighborhood structure on the data manifold and is a linear approximation to Locally Linear Embedding (LLE). However, in typical image recognition in 1D vectors space, where the number of data samples is smaller than the dimension of data space, suffering from the singularity problem of matrix, NPE algorithm cannot be implemented directly. In this paper, we investigate NPE directly on image matrix for image recognition. The proposed Two-dimensional Neighborhood Preserving Embedding (2DNPE) and bilateral Two-dimensional Neighborhood Preserving Embedding (B2DNPE) algorithms are all based directly on 2D image matrices rather than on 1D vectors as NPE does, thus the problem of singularity confronted in 1D case is overcome. 2DNPE performs compression only in row direction, while B2DNPE performs compression both in row and in column direction. The relation of them to 2DLPP (B2DLPP) are also presented. The proposed algorithms are evaluated on ORL face database and handwritten digits database. © 2012 by Binary Information Press.

关键词： Image recognition

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Passive YouTube QoE Monitoring for ISPs

Passive YouTube QoE Monitoring for ISPs

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International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing (IMIS)

作者： Raimund Schatz Tobias Hoßfeld Pedro Casas Telecommunications Research Center Vienna-FTW Vienna Austria Institute of Computer Science Chair of Communication Networks University of Würzburg Wurzburg Germany

Over the last decade, Quality of Experience (QoE) has become the guiding paradigm for enabling a more user-centric understanding of quality of communication networks and services. The intensifying competition among ISPs and the exponentially increasing traffic volumes caused by online video platforms like YouTube is forcing service providers to integrate QoE into their corporate DNA. This paper investigates the problem of YouTube QoE monitoring from an access provider's perspective. To this end, we present three novel methods for in-network measurement of the QoE impairment that dominates user perception in the context of HTTP video-streaming: stalling of playback. Our evaluation results show that it is possible to detect application-level stalling events at high accuracy by using network-level passive probing only. However, only the most complex and most accurate approach can be used for QoE prediction due to the non-linear ties inherent in human quality perception.

关键词： Streaming media YouTube Monitoring Quality of service Approximation methods Data mining Accuracy

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Monitoring performance-related QoS properties in service-oriented systems: A pattern-based architectural decision model

Monitoring performance-related QoS properties in service-ori...

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16th European Conference on Pattern Languages of Programs, EuroPLoP 2011

作者： Oberortner, Ernst Sobernig, Stefan Zdun, Uwe Dustdar, Schahram Distributed Systems Group Information Systems Institute Vienna University of Technology Argentinierstrasse 8/184-1 A-1040 Vienna Austria UZA II Augasse 2-6 A-1090 Vienna Austria Software Architecture Faculty of Computer Science Vienna University Waehringerstrae 29 A-1090 Vienna Austria

ISBN: (纸本)9781450313025

In service-oriented systems, service-level agreements (SLA) are specified as contracts between service providers and service consumers. SLAs stipulate - among other things - the provided services' performance. A service provider must fulfill the agreements stated in SLAs, e.g., to avoid paying penalties. Service consumers must verify whether the service quality as purchased is delivered. We present an architectural design decision model (ADDM) covering the design of a QoS monitoring infrastructure. The ADDM collects design decisions about measuring, storing, and evaluating performance-related quality-of-service (QoS) agreements. The model includes various requirements and puts forth design solutions by referring to established architectural, remoting, and design patterns. We evaluate the ADDM to build the architecture of a QoS monitoring infrastructure in a case study. The model guides through the decision-making process of designing a QoS monitoring infrastructure. © 2011 ACM.

关键词： Quality of service

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Delay-bounded Sink Mobility in Wireless Sensor Networks

Delay-bounded Sink Mobility in Wireless Sensor Networks

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IEEE International Conference on Communications

作者： Yu Gu Yusheng Ji Jie Li Biao Han Baohua Zhao Information Systems Architecture Science Research Division National Institute of Informatics Department of Computer Science University of Tsukuba Tsukuba Science City State Key Laboratory of Networking and Switching Technology

ISBN: (纸本)9781457720529

This paper exploits sink mobility to prolong the network lifetime in wireless sensor networks (WSNs) where the information delay caused by moving the sink should be bounded. We build a unified framework for analyzing this joint sink mobility and routing problem. We offer a mathematical modeling that is general and captures diversified issues, e.g. sink mobility, routing, delay, etc. We discuss the induced subproblems and present efficient solutions for them. Then, we generalize these solutions and propose a polynomial-time optimal algorithm for the origin problem. In simulations, we show the benefits of involving a mobile sink. We also show that the impact of the delay bound on the network lifetime.

关键词： Sinks Wireless sensor networks Routing Problem mobility mathematical modeling

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Finding Critical Components in Embedded Control Systems Sensitive to Quality-Faults

Finding Critical Components in Embedded Control Systems Sens...

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International Symposium on Electronic System Design (ISED)

作者： Vishal Shrivastav S. G. Vadlamudi P. P. Chakrabarti Dipankar Das Purnendu Sinha Department of Computer Science and Engineering Indian Institute of Technology Kharagpur Kharagpur India Electrical and Software Architecture Group General Motors India Science Laboratory Bangalore India

ISBN: (纸本)9781467347044

Embedded control systems used in safety critical systems need to be robust to quality-faults such as shift, noise, and spikes. Methods for finding counterexamples (quality-faults whose injection leads to violation of fault-tolerance requirements) at an early stage of control system design were proposed in the literature. Given these counterexamples, control design should be improved such that it is quality-fault tolerant. In this paper, we propose an effective methodology for finding critical components in embedded control systems which are sensitive to quality-faults based on the given counterexamples, which is an important step towards improving the control design. Experimental results on the fault-tolerant fuel controller of Simulink library show the efficacy of proposed methodology.

关键词： critical components quality-faults robustness fault-tolerance embedded control systems control systems Crucial components Fault tolerance Robustness control systems design embedding FINDINGS

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Magazine publishing: Editorial process structure and environmental impacts - A case study

Magazine publishing: Editorial process structure and environ...

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64th Annual Technical Conference of the Technical Association of the Graphic Arts, TAGA: Disseminating Graphic Arts Research Internationally since 1948

作者： Picha, Malin Achachlouei, Mohammad Ahmadi Moberg, Åsa Swedish Media Publishers' Association Box 22500 104 22 Stockholm Sweden KTH Royal Institute of Technology School of Computer Science and Communication Department of Media Technology and Interaction Design 100 44 Stockholm Sweden KTH Royal Institute of Technology School of Architecture and the Built Environment Division of Environmental Strategies Research 100 44 Stockholm Sweden

ISBN: (纸本)9781935185048

This study investigates the structure of the editorial processes at a Swedish monthly magazine for interior decorating and design, Sköna hem, and assesses the carbon footprint (greenhouse gas emissions) of the editorial content production during one year. The objective is to define the processes using a computer based process modeling tool and to analyze the workflow in order to discover how the different steps in the production process relate to different environmentally related parameters. An additional objective is to present the carbon footprint of the overall editorial work and to identify the major reasons for greenhouse gas emissions, as well as any major data gaps and uncertainties. Semi-structured interviews were undertaken in order to identify the process steps involved in the content production. Environmentally related parameters, such as travel distance, mode of transports, and computer hours, were then collected for each process step. Life cycle assessment methodology was used to assess the potential greenhouse gas emissions of the editorial work at Sköna hem. A number of process steps were identified in the content production. Three overall phases were identified, into which the process steps can be grouped. Firstly, the planning phase consists of meetings with different key persons in order to plan the content of the next issues of the magazine. Secondly, the executive phase was identified. Here, all the articles and pictures are produced. Thirdly, the assembly phase includes text editing and page design. Finally, ready-made pages are sent to printing or to the digital publishing channels such as tablets and the web. According to the assessment made, the editorial content production at Sköna hem has a carbon footprint of 23 tons of carbon dioxide equivalents per year. The major reasons are the manufacturing of computers and screens used at the office, business trips by plane, and transports by delivery firms mainly used for transporting furniture and

关键词： Carbon footprint

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Digital urban modeling and simulation

Communications in Computer and Information Science

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Communications in computer and Information science 2012年 242卷

作者： Arisona, Stefan Müller Aschwanden, Gideon Halatsch, Jan Wonka, Peter Stefan Müller Arisona Singapore-ETH Centre Future Cities Laboratory Singapore ETH Zurich Chair of Information Architecture Zurich Switzerland Arizona State University Department of Computer Science and Engineering Tempe AZ United States

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