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21st International Conference on MultiMedia Modeling, MMM 2015

作者： Wu, Shuyi Zhang, Xiang Guan, Naiyang Tao, Dacheng Huang, Xuhui Luo, Zhigang Science and Technology on Parallel Distributed Processing Laboratory College of Computer National University of Defense Technology Changsha Hunan410073 China Department of Computer Science and Technology College of Computer National University of Defense Technology Changsha Hunan410073 China Centre for Quantum Computation & Intelligent Systems and the Faculty of Engineering and Information Technology University of Technology Sydney 235 Jones Street UltimoNSW2007 Australia

ISBN: (纸本)9783319144412

Non-negative matrix factorization (NMF) has been a popular data analysis tool and has been widely applied in computer vision. However, conventional NMF methods cannot adaptively learn grouping structure froma *** paper proposes a non-negative low-rank and group-sparse matrix factorization (NLRGS) method to overcome this deficiency. Particularly, NLRGS captures the relationships among examples by constraining rank of the coefficients meanwhile identifies the grouping structure via group sparsity regularization. By both constraints, NLRGS boosts NMF in both classification and clustering. However, NLRGS is difficult to be optimized because it needs to deal with the low-rank constraint. To relax such hard constraint, we approximate the low-rank constraint with the nuclear norm and then develop an optimization algorithm for NLRGS in the frame of augmented Lagrangian method(ALM). Experimental results of both face recognition and clustering on four popular face datasets demonstrate the effectiveness of NLRGS in quantities. © Springer International Publishing Switzerland 2015.

关键词： Non-negative matrix factorization

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Two-dimensional euler PCA for face recognition 21

Two-dimensional euler PCA for face recognition

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21st International Conference on MultiMedia Modeling, MMM 2015

作者： Tan, Huibin Zhang, Xiang Guan, Naiyang Tao, Dacheng Huang, Xuhui Luo, Zhigang Science and Technology on Parallel Distributed Processing Laboratory College of Computer National University of Defense Technology Changsha Hunan410073 China Department of Computer Science and Technology College of Computer National University of Defense Technology Changsha Hunan410073 China Centre for Quantum Computation and Intelligent Systems and the Faculty of Engineering and Information Technology University of Technology Sydney 235 Jones Street UltimoNSW2007 Australia

ISBN: (纸本)9783319144412

Principal component analysis (PCA) projects data on the directions with maximal variances. Since PCA is quite effective in dimension reduction, it has been widely used in computer vision. However, conventional PCA suffers from following deficiencies: 1) it spends much computational costs to handle high-dimensional data, and 2) it cannot reveal the nonlinear relationship among different features of data. To overcome these deficiencies, this paper proposes an efficient two-dimensional Euler PCA (2D-ePCA) algorithm. Particularly, 2D-ePCA learns projection matrix on the 2D pixel matrix of each image without reshaping it into 1D long vector, and uncovers nonlinear relationships among features by mapping data onto complex representation. Since such 2D complex representation induces much smaller kernel matrix and principal subspaces, 2D-ePCA costs much less computational overheads than Euler PCA on large-scale dataset. Experimental results on popular face datasets show that 2D-ePCA outperforms the representative algorithms in terms of accuracy, computational overhead, and robustness. © Springer International Publishing Switzerland 2015.

关键词： Principal component analysis

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curlX: A middleware to enforce access control policies within a cloud environment

curlX: A middleware to enforce access control policies withi...

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IEEE Conference on Communications and Network Security (CNS)

作者： Meryeme Ayache Mohammed Erradi Bernd Freisleben Networking & Distributed Systems Research Group Mohammed V University Rabat Morocco Department of Mathematics & Computer Science University of Marburg Germany

Today cloud security and privacy concerns pose significant challenges. One particular challenge consists in how to take into consideration the user's security policies while accessing the outsourced data. In fact, for a given application, we may have a set of rules, as high level security policy, which needs to hold prior to any query execution. Therefore, the main problem that we tackle in this ongoing project is how to enforce this high level security policy in the cloud storage layer without conflicts. To address this challenges, we propose a middleware denoted curlX which consists of two main processes: the security policy enforcement process and the verification process.

关键词： Cloud computing Access control Data privacy Virtual machining Electronic mail

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Evaluation of performance and response capacity in Emergency Deparments 15

Evaluation of performance and response capacity in Emergency...

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Simulation Winter Conference

作者： Eva Bruballa Manel Taboada Alvaro Wong Dolores Rexachs Emilio Luque Tomàs Cerdà Computer Science School University Autonoma of Barcelona BCN SPAIN Computer Architecture and Operating Systems Department University Autonoma of Barcelona BCN SPAIN

ISBN: (纸本)9781467397414

The saturation of Emergency departments, due to the increasing demand of the service, is a current problem in the healthcare system. We propose an analytical model to obtain information from data obtained through the simulation of a Hospital Emergency department. The model defines how to calculate the theoretical throughput of a particular sanitary staff configuration, that is, the number of patients it can attend per unit time given its composition. This index is a reference to measure indicators concerning to performance and emergency response capacity of the system. The data for the analysis will be generated by the simulation of any possible scenario of the real system, taking into account all valid sanitary staff configurations and different number of patients entering into the emergency service.

关键词： Ad hoc networks Mobile computing

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Quantitative Evaluation of Decision Effects in the Management of Emergency department Problems

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Procedia computer science 2015年 51卷 433-442页

作者： Zhengchun Liu Eduardo Cabrera Manel Taboada Francisco Epelde Dolores Rexachs Emilio Luque Computer Architecture & Operating Systems University Autonoma of Barcelona(UAB) Spain Institute of Advanced Research Computing Durham University UK Tomas Cerda Computer Science School (UAB) Spain Medicine Department Hospital Universitari Parc Tauli (UAB) Spain

Due to the complexity and crucial role of an Emergency department(ED) in the healthcare system. The ability to more accurately represent, simulate and predict performance of ED will be invaluable for decision makers to solve management problems. One way to realize this requirement is by modeling and simulating the emergency department, the objective of this research is to design a simulator, in order to better understand the bottleneck of ED performance and provide ability to predict such performance on defined condition. Agent-based modeling approach was used to model the healthcare staff, patient and physical resources in ED. This agent-based simulator provides the advantage of knowing the behavior of an ED system from the micro-level interactions among its components. The model was built in collaboration with healthcare staff in a typical ED and has been implemented and verified in a Netlogo modeling environment. Case studies are provided to present some capabilities of the simulator in quantitive analysis ED behavior and supporting decision making. Because of the complexity of the system, high performance computing technology was used to increase the number of studied scenarios and reduce execution time.

关键词： Emergency department Agent-based Modeling Complex System Decision Support

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Adaptive Fault Tolerant Checkpointing Algorithm for Cluster Based Mobile Ad Hoc Networks

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Procedia computer science 2015年 73卷 40-47页

作者： Houssem Mansouri Nadjib Badache Makhlouf Aliouat Al-Sakib Khan Pathan Department of Computer Science Faculty of Exact Sciences University of Bejaia 06000 Bejaia Algeria Research Center on Scientific and Technical Information CERIST Ben-Aknoun Algiers 16000 Algeria Laboratory of Networks and Distributed Systems Computer Science Department University of Ferhat Abbas Sétif1 Setif 19000 Algeria Department of Computer Science International Islamic University Malaysia Kuala Lumpur 53100 Malaysia

Mobile Ad hoc NETwork (MANET) is a type of wireless network consisting of a set of self-configured mobile hosts that can communicate with each other using wireless links without the assistance of any fixed infrastructure. This has made possible to create a distributed mobile computing application and has also brought several new challenges in distributed algorithm design. Checkpointing is a well explored fault tolerance technique for the wired and cellular mobile networks. However, it is not directly applicable to MANET due to its dynamic topology, limited availability of stable storage, partitioning and the absence of fixed infrastructure. In this paper, we propose an adaptive, coordinated and non-blocking checkpointing algorithm to provide fault tolerance in cluster based MANET, where only minimum number of mobile hosts in the cluster should take checkpoints. The performance analysis and simulation results show that the proposed scheme performs well compared to works related.

关键词： MANET distributed mobile computing fault tolerance clustering checkpointing.

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Agent Based Model and Simulation of MRSA Transmission in Emergency departments

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Procedia computer science 2015年 51卷 443-452页

作者： Cecilia Jaramillo Manel Taboada Francisco Epelde Dolores Rexachs Emilio Luque Department of Computer Architecture & Operating Systems Universitat Autonoma de Barcelona Bellaterra 08193 Barcelona Spain Tomas Cerda Computer Science School Universitat Autonoma de Barcelona Sant Cugat 08714 Barcelona Spain Medicine Department Hospital Universitari Parc Tauĺı Universitat Autonoma de Barcelona Sabadell 08208 Barcelona Spain

In healthcare environments we can find several microorganisms causing nosocomial infection, and of which one of the most common and most dangerous is Methicillin-resistant Staphylococcus Aureus. Its presence can lead to serious complications to the *** work uses Agent Based Modeling and Simulation techniques to build the model and the simulation of Methicillin-resistant Staphylococcus Aureus contact transmission in emergency departments. The simulator allows us to build virtual scenarios with the aim of understanding the phenomenon of MRSA transmission and the potential impact of the implementation of different measures in propagation rates.

关键词： Agent Based Modeling and Simulation MRSA Transmission Emergency department Complex System.

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GSOS for non-deterministic processes with quantitative aspects 12

GSOS for non-deterministic processes with quantitative aspec...

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12th International Workshop on Quantitative Aspects of Programming Languages and systems, QAPL 2014

作者： Miculan, Marino Peressotti, Marco Laboratory of Models and Applications of Distributed Systems Department of Mathematics and Computer Science University of Udine Italy

Recently, some general frameworks have been proposed as unifying theories for processes combining non-determinism with quantitative aspects (such as probabilistic or stochastically timed executions), aiming to provide general results and tools. This paper provides two contributions in this respect. First, we present a general GSOS specification format (and a corresponding notion of bisimulation) for non-deterministic processes with quantitative aspects. These specifications define labelled transition systems according to the ULTraS model, an extension of the usual LTSs where the transition relation associates any source state and transition label with state reachability weight functions (like, e.g., probability distributions). This format, hence called Weight Function SOS (WFSOS), covers many known systems and their bisimulations (e.g. PEPA, TIPP, PCSP) and GSOS formats (e.g. GSOS, Weighted GSOS, Segala-GSOS, among others). The second contribution is a characterization of these systems as coalgebras of a class of functors, parametric on the weight structure. This result allows us to prove soundness of the WFSOS specification format, and that bisimilarities induced by these specifications are always congruences. © 2014 M. Miculan & M. Peressotti.

关键词： Specifications

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ADVISE – A framework for evaluating cloud service elasticity behavior 12

ADVISE – A framework for evaluating cloud service elasticit...

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12th International Conference on Service-Oriented Computing, ICSOC 2014

作者： Copil, Georgiana Trihinas, Demetris Truong, Hong-Linh Moldovan, Daniel Pallis, George Dustdar, Schahram Dikaiakos, Marios Distributed Systems Group Vienna University of Technology Austria Computer Science Department University of Cyprus Cyprus

ISBN: (纸本)9783662453902

Complex cloud services rely on different elasticity control processes to deal with dynamic requirement changes and workloads. However, enforcing an elasticity control process to a cloud service does not always lead to an optimal gain in terms of quality or cost, due to the complexity of service structures, deployment strategies, and underlying infrastructure dynamics. Therefore, being able, a priori, to estimate and evaluate the relation between cloud service elasticity behavior and elasticity control processes is crucial for runtime choices of appropriate elasticity control processes. In this paper we present ADVISE, a framework for estimating and evaluating cloud service elasticity behavior. ADVISE gathers service structure, deployment, service runtime, control processes, and cloud infrastructure information. Based on this information, ADVISE utilizes clustering techniques to identify cloud elasticity behavior produced by elasticity control. Our experiments show that ADVISE can estimate the expected elasticity behavior, in time, for different cloud services thus being a useful tool to elasticity controllers for improving the quality of runtime elasticity control decisions. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Elasticity

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Bridging the application knowledge gap: Using ontology-based situation recognition to support energy-aware resource scheduling 13

Bridging the application knowledge gap: Using ontology-based...

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13th Workshop on Adaptive and Reflective Middleware, ARM 2014, co-located with ACM/IFIP/USENIX International Middleware Conference

作者： Hähnel, Marcus Mendez, Julian Thost, Veronika Anni-Yasmin, Turhan Department of Operating Systems Institute of Systems Architecture Technische Universität Dresden Germany Department for Automata Theory Institute for Theoretical Computer Science Technische Universität Dresden Germany

ISBN: (纸本)9781450332323

Regarding energy efficiency, resource management in complex hard- And software systems that is based on the information typically available to the OS alone does not yield best results. Nevertheless, general-purpose resource management should stay independent of application-specific information. To resolve this dilemma, we propose a generic, ontologybased approach to resource scheduling that is context-aware and takes information of running applications into account. The central task here is to recognize situations that might necessitate an adaptation of resource scheduling. This task is performed by logical reasoning over OWL ontologies. Our initial study shows that current OWL 2 EL reasoner systems can perform recognition of exemplary situations relevant to resource management within 4 seconds. Copyright 2014 ACM.

关键词： Energy efficiency

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