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检索条件"机构=Dep. Computer Architecture & Computer Technology"

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Static analysis of worst-case stack cache behavior 13

Static analysis of worst-case stack cache behavior

引用

21st International Conference on Real-Time Networks and Systems, RTNS 2013

作者： Jordan, Alexander Brandner, Florian Schoeberl, Martin Compilers and Languages Group Institute of Computer Languages Vienna University of Technology Austria Embedded Systems Engineering Section Dep. of Applied Mathematics and Computer Science Technical University of Denmark Denmark

ISBN: (纸本)9781450320580

Utilizing a stack cache in a real-time system can aid predictability by avoiding interference that heap memory traffic causes on the data cache. While loads and stores are guaranteed cache hits, explicit operations are responsible for managing the stack cache. The behavior of these operations can be analyzed statically. We present algorithms that derive worst-case bounds on the latency-inducing operations of the stack cache. Their results can be used by a static WCET tool. By breaking the analysis down into subproblems that solve intra-procedural data-flow analysis and path searches on the call-graph, the worst-case bounds can be efficiently yet precisely determined. Our evaluation using the MiBench benchmark suite shows that only 37% and 21% of potential stack cache operations actually store to and load from memory, respectively. Analysis times are modest, on average running between 0.46s and 1.30s per benchmark, dep.nding on the size of the stack cache. © 2013 ACM.

关键词： Real time systems

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Directing exploratory search: Reinforcement learning from user interactions with keywords 13

Directing exploratory search: Reinforcement learning from us...

引用

18th International Conference on Intelligent User Interfaces, IUI 2013

作者： Glowacka, Dorota Ruotsalo, Tuukka Konyushkova, Ksenia Athukorala, Kumaripaba Kaski, Samuel Jacucci, Giulio Helsinki Institute for Information Technology HIIT Dep. of Computer Science University of Helsinki Finland Helsinki Institute for Information Technology HIIT Aalto University Finland

ISBN: (纸本)9781450320559

Techniques for both exploratory and known item search tend to direct only to more specific subtopics or individual documents, as opposed to allowing directing the exploration of the information space. We present an interactive information retrieval system that combines Reinforcement Learning techniques along with a novel user interface design to allow active engagement of users in directing the search. Users can directly manipulate document features (keywords) to indicate their interests and Reinforcement Learning is used to model the user by allowing the system to trade off between exploration and exploitation. This gives users the opportunity to more effectively direct their search nearer, further and following a direction. A task-based user study conducted with 20 participants comparing our system to a traditional query-based baseline indicates that our system significantly improves the effectiveness of information retrieval by providing access to more relevant and novel information without having to spend more time acquiring the information. Copyright © 2013 ACM.

关键词： Reinforcement learning

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Expressing Best Practices in (Risk) Analysis and Testing of Safety-Critical Systems Using Patterns

Expressing Best Practices in (Risk) Analysis and Testing of ...

引用

IEEE International Conference on Software Reliability Engineering Workshops (ISSRE Wksp)

作者： Wolfgang Herzner Sven Sieverding Omar Kacimi Eckard Böde Thomas Bauer Brian Nielsen Safety & Security Department AIT Austrian Institute of Technology Vienna Austria Transp. Dept. OFFIS - Inst. for Inf. Technol. Oldenburg Germany Transportation Department OFFIS - Institute for Information Technology Oldenburg Germany Dep. of Embedded Systems Quality Assurance Fraunhofer IESE Kaiserslautern Germany Department of Computer Science Aalborg University Denmark

The continuing pervasion of our society with safety-critical cyber-physical systems not only demands for adequate (risk) analysis, testing and verification techniques, it also generates growing experience on their use, which can be considered as important as the tools themselves for their efficient use. This paper introduces workflow patterns to describe such best practices in a systematic way that efficiently represents this knowledge, and also provides a way to relate different patterns, making them easier to identify and use, and cover as wide a range of experiences as possible. The value of the approach is demonstrated using some pattern examples from a collection developed in the Artemis-project MBAT. Finally, the paper presents a wiki-based approach for developing and maintaining the pattern collection.

关键词： Safety Analytical models Information services Electronic publishing Internet Best practices Testing

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CMOS photodiode model and HDL implementation

CMOS photodiode model and HDL implementation

引用

2013 European Conference on Circuit Theory and Design, ECCTD 2013

作者： Blanco-Filgueira, B. López, P. Suárez, M. Roldán, J.B. CITIUS University of Santiago de Compostela 15782 Santiago-de Compostela Spain Dep. of Electronics and Computer Technology University of Granada 18071 Granade Spain

ISBN: (纸本)9783000437854

With CMOS image sensors scaling down due to the resolution and miniaturization demands, compact models for these devices become essential. A physically based model can be used to optimize the device performance and allow circuit designers to use these sensors in integrated circuits. Among other capacities, this analytical model can be used to predict with high accuracy the best photodiode geometry to achieve the maximum photoresponse while optimizing the total layout area cost. © 2013 TU Dresden.

关键词： Photodiodes

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Improvement of Leach Protocol for Wireless Sensor Networks

Improvement of Leach Protocol for Wireless Sensor Networks

引用

International Conference on Instrumentation, Measurement, computer, Communication and Control (IMCCC)

作者： Yong-Zhen Li Ai-Li Zhang Yu-Zhu Liang Dep. of Computer Science & Technology Yanbian University Yanji China

LEACH is a hierarchical routing protocol special for WSN. Many researchers have proposed many improved algorithms based on LEACH, such as LEACH-C, LEACH-M and so on, and these algorithms have much improvements on efficiency of energy in certain extent. Within the lifetime of networks, based on the shortcomings of LEACH that each node is frequently repeated several times elected cluster-head and consumed some energy, this paper proposes a hierarchical routing improved algorithm based on the LEACH algorithm(i.e., LEACH-R). The simulation results show that the improved algorithm makes the energy distribution more balanced, and LEACH-R outperforms LEACH-M nearly 20%.

关键词： Energy consumption Clustering algorithms Wireless sensor networks Time division multiple access Mathematical model Routing protocols

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A temporal logic for planning under uncertainty

A temporal logic for planning under uncertainty

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26th International Florida Artificial Intelligence Research Society Conference, FLAIRS 2013

作者： Biscaia, Manuel Baltazar, Pedro Mateus, Paulo Nagarajan, Rajagopal Instituto de Telecomunicações Dep. Mathematics Universidade Técnica de Lisboa Portugal Department of Computer Science School of Science and Technology Middlesex University London United Kingdom

ISBN: (纸本)9781577356059

Dealing with uncertainty in the context of planning has been an active research subject in AI. Addressing the case when uncertainty evolves over time can be difficult. In this work, we provide a solution to this problem by proposing a temporal logic to reason about quantities and probability. For this logic, we provide a PSPACE SAT algorithm together with a complete calculus. The algorithm enables us to perform planning under uncertainty via SAT, extending a technique used for classic planning. We can show that any obtained plan will have certain properties (desired or undesired). The calculus can also be used to derive the impossibility of a plan, given a set of specifications. Copyright © 2013, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Temporal logic

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Feature selection methods in persian sentiment analysis

引用

18th International Conference on Application of Natural Language to Information Systems, NLDB 2013

作者： Saraee, Mohamad Bagheri, Ayoub School of Computing Science and Engineering University of Salford Manchester United Kingdom Intelligent Database Data Mining and Bioinformatics Lab Electrical and Computer Engineering Dep. Isfahan University of Technology Isfahan Iran

ISBN: (纸本)9783642388231

With the enormous growth of digital content in internet, various types of online reviews such as product and movie reviews present a wealth of subjective information that can be very helpful for potential users. Sentiment analysis aims to use automated tools to detect subjective information from reviews. Up to now as there are few researches conducted on feature selection in sentiment analysis, there are very rare works for Persian sentiment analysis. This paper considers the problem of sentiment classification using different feature selection methods for online customer reviews in Persian language. Three of the challenges of Persian text are using of a wide variety of declensional suffixes, different word spacing and many informal or colloquial words. In this paper we study these challenges by proposing a model for sentiment classification of Persian review documents. The proposed model is based on stemming and feature selection and is employed Naive Bayes algorithm for classification. We evaluate the performance of the model on a collection of cellphone reviews, where the results show the effectiveness of the proposed approaches. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Feature Selection

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Improving performance of all-to-all communication through loop scheduling in PGAS environments 13

Improving performance of all-to-all communication through lo...

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27th ACM International Conference on Supercomputing, ICS 2013

作者： Alvanos, Michail Tanase, Gabriel Farreras, Montse Tiotto, Ettore Amaral, José Nelson Martorell, Xavier Programming Models Barcelona Supercomputer Center Barcelona Spain IBM TJ Watson Research Center Yorktown Heights NY United States Dep. of Computer Architecture Universitat Politècnica de Catalunya Barcelona Spain Static Compilation Technology IBM Toronto Laboratory Toronto ON Canada Dep. of Computing Science University of Alberta Edmonton AB Canada IBM Canada CAS Research Markham ON Canada

No abstract available.

ISBN: (纸本)9781450321303

No abstract available.

关键词： unified parallel c partitioned global address space performance evaluation one-sided communication

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Application of evolutionary algorithms to maximum lifetime coverage problem in wireless sensor networks

Application of evolutionary algorithms to maximum lifetime c...

引用

2013 IEEE 37th Annual computer Software and Applications Conference, COMPSAC 2013

作者： Tretyakova, Antonina Seredynski, Franciszek Polish-Japanese Institute of Information Technology Warsaw Poland Dep. of Mathematics and Natural Sciences Cardinal Stefan Wyszynski University Warsaw Poland Computer Science Department Siedlce University of Natural Sciences and Humanities Siedlce Poland

ISBN: (纸本)9780769549798

The paper analyzes three recently proposed algorithms, which differ not only in the method of finding solution to the Maximum Lifetime Coverage problem in Wireless Sensor Networks (WSN), but also approaches to a statement of the problem. In order to compare algorithms: (1) they were adapted to the common assumptions that correspond to real characteristics of sensor networks and (2) special sensor network simulator was used to study the algorithms. The paper presents the results of an experimental study and shows how the lifetime of WSN dep.nds on a different set of algorithms parameters and WSNs parameters. Based on the results of the experiments, conclusions about the validity of the assumptions of algorithms, quality of solutions and possible improvements are drawn. © 2013 IEEE.

关键词： Wireless sensor networks

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Physical layer security vs. network layer secrecy: Who wins on the untrusted two-way relay channel?

Physical layer security vs. network layer secrecy: Who wins ...

引用

IEEE International Workshop on computer-Aided Modeling, Analysis, and Design of Communication Links and Networks, CAMAD

作者： Johannes Richter Elke Franz Sabrina Engelmann Stefan Pfennig Eduard A. Jorswieck Dep. of Electrical Engineering and Information Technology/Communications Laboratory Dep. of Computer Science/Privacy and Data Security Technische Universität Dresden Dresden Germany

We consider the problem of secure communications in a Gaussian two-way relay network where two nodes exchange confidential messages only via an untrusted relay. The relay is assumed to be honest but curious, i.e., an eavesdropper that conforms to the system rules and applies the intended relaying scheme. We analyze the achievable secrecy rates by applying network coding on the physical layer or the network layer and compare the results in terms of complexity, overhead, and efficiency. Further, we discuss the advantages and disadvantages of the respective approaches.

关键词： Physical layer Relays Network coding Lattices Payloads Cryptography

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