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ATM: An automatic trust monitoring algorithm for service software 09

ATM: An automatic trust monitoring algorithm for service sof...

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24th Annual acm symposium on applied computing, SAC 2009

作者： Gias Uddin, Mohammad Zulkernine, Mohammad Dept. of Electrical and Computer Engineering Queen's University Kingston ON Canada School of Computing Queen's University Kingston ON Canada

ISBN: (纸本)9781605581668

While providing services to stakeholders, service software can be exploited by potentially untrustworthy users. Given that, it is necessary to monitor the trust relationships between service providers and requestors for potential vulnerabilities they may invite to the total system. In this paper, we propose an Automatic Trust Monitoring algorithm called ATM based on the specification of trust relationships in trust scenarios and the quantification of the relationships through trust calculation schemes. Trust rules are generated from the trust scenarios ready to be deployed at run-time. A service requestor is penalized for the violation of a trust rule and rewarded for no such violation. this analysis facilitates the quantification of the trustworthiness of service requestors and the accuracy of the recommendations from other service providers that can be used to make dynamic decisions on the corresponding requestors. the monitor is implemented in a prototype file sharing grid and evaluated using file sharing applications. Copyright 2009 acm.

关键词： Network security

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Implicit relevance feedback for context-aware information retrieval in UbiLearning environments 09

Implicit relevance feedback for context-aware information re...

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24th Annual acm symposium on applied computing, SAC 2009

作者： Martins, Diogo S. Biajiz, Mauro Do Prado, Antonio F. De Souza, Wanderley L. Ubiquitous Computing Group Departamento de Computação Universidade Federal de São Carlos São Carlos - SP Brazil

ISBN: (纸本)9781605581668

Ubiquitous Learning (UbiLearning) environments heavily employ mobile devices to empower users with mobility and tooling support to learn anytime, anywhere. Introducing mobile devices in educational settings imposes constraints on search behavior due to limited resources on these devices such as small screens and restricted input functionalities. Targeting this scenario, this paper proposes an architecture for implicit relevance feedback which considers users' work context to expand search queries in order to satisfy information needs with greater precision. Evaluation results conducted over a local test collection enriched with contextual features reveal improvements on average precision when compared to a pseudo relevance feedback baseline. Copyright 2009 acm.

关键词： Information retrieval

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Improving functional verification of embedded systems using hierarchical composition and set theory 09

Improving functional verification of embedded systems using ...

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24th Annual acm symposium on applied computing, SAC 2009

作者： Rodrigues, Cássio L. Da Silva, Karina R. G. Cunha, Henrique N. Departament of Systems and Computing Federal University of Campina Grande Campina Grande - PB Brazil School of Electrical and Computer Engineering Federal University of Goiás Goiânia - GO Brazil

ISBN: (纸本)9781605581668

During functional verification, complex interactions between multiple modules that compose a digital circuit design can reveal hard-to-find bugs. Functional coverage specifications must be precise to assure these interactions occur during the simulation. We are proposing a technique for improving the functional verification specification of individual modules, preserving the occurrence of these interactions scenarios in the composition phase. We obtain these new specifications in a deductive way, by means of set theory. Using experimental results, we show how our work can contribute to error detection and save functional verification time. Copyright 2009 acm.

关键词： Set theory

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Refining spectrum-based fault localization rankings 09

Refining spectrum-based fault localization rankings

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24th Annual acm symposium on applied computing, SAC 2009

作者： Abreu, Rui Mayer, Wolfgang Stumptner, Markus Van Gemund, Arjan J. C. Embedded Software Lab. Delft University of Technology Netherlands Advanced Computing Research Centre University of South Australia Australia

ISBN: (纸本)9781605581668

Spectrum-based fault localization is a statistical technique that aims at helping software developers to find faults quickly by analyzing abstractions of program traces to create a ranking of most probable faulty components (e.g., program statements). Although spectrum-based fault localization has been shown to be effective, its diagnostic accuracy is inherently limited, since the semantics of components are not considered. In particular, components that exhibit identical execution patterns cannot be distinguished. To enhance its diagnostic quality, in this paper, we combine spectrum-based fault localization with a model-based debugging approach based on abstract interpretation within a framework coined Deputo. the model-based approach is used to refine the ranking obtained from the spectrum-based method by filtering out those components that do not explain the observed failures when the program's semantics is considered. We show that this combined approach outperforms the individual approaches and other state-of-the-art automated debugging techniques. Copyright 2009 acm.

关键词： Semantics

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Using Dynamic Bayesian Networks to infer gene regulatory networks from expression profiles 09

Using Dynamic Bayesian Networks to infer gene regulatory net...

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24th Annual acm symposium on applied computing, SAC 2009

作者： Shermin, Akther Orgun, Mehmet A. Macquarie University Department of Computing NSW 2109 Australia

ISBN: (纸本)9781605581668

Two major challenges in inferring the sparse topological architecture of Gene Regulatory Networks using computational methods are 1) the low accuracy of predicting connections between genes and 2) the excessive computational cost. In order to address these challenges, we have exploited some biological features of yeast cell cycle. One such feature is that, a high proportion of Cell Cycle Regulated genes are periodically expressed;that is genes are maximally expressed to affect and control the regulation of other genes and on completing certain tasks;they are repressed by some other regulator genes. thus the whole cell cycle progresses systematically through the successive activation and inactivation of CCR genes. To use this feature, we have calculated the peak time of individual genes which falls into one/more phases of the cell cycle. therefore, genes that peak in the interval of the same phase of the cell cycle have been grouped together. Finally, we have applied the Dynamic Bayesian Network (DBN) algorithm within distinct phases of genes. As a consequence, both the accuracy and the computational cost of our learning algorithm have been improved in comparison with the existing DBN algorithms. Copyright 2009 acm.

关键词： Gene expression

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A new K-View algorithm for texture image classification using rotation-invariant feature 09

A new K-View algorithm for texture image classification usin...

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24th Annual acm symposium on applied computing, SAC 2009

作者： Liu, Hong Dai, Siguang Song, Enmin Yang, Cihui Hung, Chih-Cheng School of Computer Science Huazhong University of Science and Technology Wuhan China School of Computing and Software Engineering Southern Polytechnic State University Marietta GA 30060 United States

ISBN: (纸本)9781605581668

this paper proposes a new K-View algorithm for texture image classification using rotation-invariant features. these features are statistically derived from characteristic view sets for each texture. Unlike the existing K-View algorithm, all the views used are transformed into rotation-invariant features and the K views are selected randomly. In contrast, the existing K-View algorithm uses the K-means algorithm for choosing the K views. In this new algorithm the decision of determining a pixel to which texture class it belong to, is made by considering all the views which consist of the pixel being classified. In order to preserve the primitive information of a texture class as much as possible, the proposed algorithm randomly selects k views of the view set from each sample sub-image as the characteristic view set. Experimental results show that the proposed algorithm is more robust and accurate compared with the results of the existing K-View algorithm. Copyright 2009 acm.

关键词： Pixels

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computing data cubes using exact sub-graph matching: the sequential MCG approach 09

Computing data cubes using exact sub-graph matching: The seq...

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24th Annual acm symposium on applied computing, SAC 2009

作者： De Castro Lima, Joubert Hirata, Celso Massaki ITA P. Marechal Ed. Gomes - V. Acácias 12.228-900 - S.J.C. - S.P. Brazil

ISBN: (纸本)9781605581668

In this paper, we present a novel full cube computation and representation approach, named MCG. In a data cube, each cuboid can be viewed as a set of sub-graphs. In general, redundant sub-graphs are quite common in a data cube, but their elimination is a hard problem as some previous cube approaches demonstrate. the MCG approach differentiates significantly from previous approaches since it efficiently eliminates all common sub-graphs from the entire cube, based on an exact sub-graph matching solution. We propose a matching function to guarantee one-to-one mapping between sub-graphs. the function is computed incrementally, in a top-down fashion, and its computation uses a minimal amount of information to generate unique results, regardless of whether we are using distributive, algebraic or holistic measures. MCG performance analysis demonstrates a similar runtime when compared to Star approach and very low memory consumption (94 - 98% reduction) when compared to a full cube representation. Copyright 2009 acm.

关键词： Graphic methods

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Impact of function inlining on resource-constrained embedded systems 09

Impact of function inlining on resource-constrained embedded...

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24th Annual acm symposium on applied computing, SAC 2009

作者： Kim, Bongjae Yi, Sangho Cho, Yookun Hong, Jiman School of Computer Science and Engineering Seoul National University Korea Republic of School of Computing Soongsil University Korea Republic of

ISBN: (纸本)9781605581668

With the development of computer systems, function inlining schemes were used to reduce execution time while increasing codes. In embedded systems such as wireless sensor nodes, there are extreme limitations on memory space and battery power. this is the reason why function inlining is useful for maximizing memory utilization while minimizing energy consumption of embedded systems. In the previous works, basic inlining schemes were proposed, which were adapted to systems with code memory constraints. However, they were too coarse-grained, and did not evaluate the impact of function inlining in terms of both energy consumption and code memory utilization in actual systems. In this paper, we propose a fine-grained function inlining scheme. We also present the impact of function inlining schemes on resource-constrained embedded systems, in terms of energy consumption and code memory overhead. Based on experimental results, we demonstrate that fine-grained function inlining can improve the energy efficiency of embedded systems while maximizing code memory utilization. Copyright 2009 acm.

关键词： Embedded systems

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Boosting the performance of computing systems through adaptive configuration tuning 09

Boosting the performance of computing systems through adapti...

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24th Annual acm symposium on applied computing, SAC 2009

作者： Chen, Haifeng Jiang, Guofei Zhang, Hui Yoshihira, Kenji NEC Laboratories America 4 Independence Way Princeton NJ 08540 United States

ISBN: (纸本)9781605581668

Good system performance depends on the correct setting of its configuration parameters. It is observed that such optimal configuration relies on the incoming workload of the system. In this paper, we utilize the Markov decision process (MDP) theory and present a reinforcement learning strategy to discover the complex relationship between the system workload and the corresponding optimal configuration. Considering the limitations of current reinforcement learning algorithms used in system management, we present a different learning architecture to facilitate the configuration tuning task which includes two units: the actor and critic. While the actor realizes a stochastic policy that maps the system state to the corresponding configuration setting, the critic uses a value function to provide the reinforcement feedback to the actor. Both the actor and critic are implemented by multiple layer neural networks, and the error back-propagation algorithm is used to adjust the network weights based on the temporal difference error produced in the learning. Experimental results demonstrate that the proposed learning process can identify the correct configuration tuning rule which in turn improves the system performance significantly. Copyright 2009 acm.

关键词： Reinforcement learning

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A pointing method using two accelerometers for wearable computing 09

A pointing method using two accelerometers for wearable comp...

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24th Annual acm symposium on applied computing, SAC 2009

作者： Tokoro, Yohei Terada, Tsutomu Tsukamoto, Masahiko Grad. School of Engineering Kobe University 1-1 Rokkodaicho Nadaku Kobe 657-8501 Japan

ISBN: (纸本)9781605581668

A variety of real-world situations are beneficial for wearable computing since it provides information services while users are doing other jobs. therefore, a simple and hands-free input interfaces have suitable for these computer operations. However, such interface has not been achieved with conventional input devices such as mice or track balls. Although gesture or eye-gaze input techniques have also been developed for wearable computing, they also suffer from problems i.e., a slow pointing speed, difficulty in carrying devices, and complexity in parallel use when doing tasks. We propose a new method of pointing using input of simple gestures with two accelerometers. By dividing the specifications of two coordinates into a combination of two independent motions, we accomplish accurate and intuitive pointing. A user attaches two small accelerometers to both his/her hands or both elbows. the pointing is done by using the intersection of two straight lines, and the movement of the lines is synchronized with that of the accelerometers. In addition, we also propose a method of changing the position of objects being pointed at that is new approach. the results we obtained from our evaluation experiments confirmed that our method was effective. Copyright 2009 acm.

关键词： Accelerometers

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