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检索条件"任意字段=Applied Computing 2004 - Proceedings of the 2004 ACM Symposium on Applied Computing"

共 2079 条记录，以下是641-650 订阅

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A distributed protocol for ensuring replicated database consistency in mobile computing environments 10

A distributed protocol for ensuring replicated database cons...

引用

25th Annual acm symposium on applied computing, SAC 2010

作者： Costa, Alex Monteiro, Jose Maria Brayner, Angelo University of Fortaleza Fortaleza Brazil

ISBN: (纸本)9781605586380

A mobile replicated database is comprised of several mobile and fixed servers and clients interconnected through a wireless network. In order to ensure data consistency in mobile replicated databases, several replication control protocols have been proposed. However, most of them reveal relevant limitations, such as: possessing a single failure point and flooding the network with messages exchange. In this paper we introduce a protocol which guarantees data consistency of replicated databases in mobile computing. The proposed approach is completely distributed, avoids the existence of a single failure point, uses a read-any/write-any replication scheme, increases data availability, and reduces the number of messages exchanged among the replicated servers. Furthermore, it allows the user to choose a transaction isolation level (degree in which the execution of a given transaction is isolated from all other concurrent transactions). Experimental results show the potential efficiency of the proposed approach. © 2010 acm.

关键词： Concurrency control

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ESB federation for large-scale SOA 10

ESB federation for large-scale SOA

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25th Annual acm symposium on applied computing, SAC 2010

作者： Baude, Françoise Filali, Imen Huet, Fabrice Legrand, Virginie Mathias, Elton Merle, Philippe Ruz, Cristian Krummenacher, Reto Simperl, Elena Hammerling, Christophe Lorre, Jean-Pierre INRIA Sophia-Antipolis Méditerranée I3S CNRS - UNS 2004 rte des Lucioles FR-06902 Sophia-Antipolis France Semantic Technology Institute University of Innsbruck Technikerstr. 21a A-6020 Innsbruck Austria EBM WebSourcing 4 Rue Amélie FR-31000 Toulouse France NRIA Lille - Nord Europe France

ISBN: (纸本)9781605586380

Embracing service-oriented architectures in the context of large systems, such as the Web, rises a set of new and challenging issues: increased size and load in terms of users and services, distribution, and dynamicity. A top-down federation of service infrastructure support that we name "service cloud" and that is capable of growing to the scale of the Internet, is seen as a promising response to such new challenges. In this paper, we define the service cloud concept, its promises and the requirements in terms of architecture and the corresponding middleware. We present some preliminary proofs of concept through the integration of a JBI-compliant enterprise service bus, extended to our needs, and a scalable semantic space infrastructure, both relying on an established grid middleware environment. The new approach offers service consumers and providers a fully transparent, distributed and federated means to access, compose and deploy services on the Internet. Technically, our contribution advances core service bus technology towards the service cloud by scaling the registries and message routers to the level of federations via a hierarchical approach, and by incorporating the communication and coordination facilities offered by a global semantic space. © 2010 acm.

关键词： Middleware

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Design and development of a real-time embedded inertial measurement unit 10

Design and development of a real-time embedded inertial meas...

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25th Annual acm symposium on applied computing, SAC 2010

作者： Facchinetti, Tullio Savioli, Alberto Goldoni, Emanuele University of Pavia Dept. of Computer Eng. and System Science 27100 - Pavia Italy University of Pavia Dept. of Electronics 27100 - Pavia Italy

ISBN: (纸本)9781605586380

Micro-Electro-Mechanical Systems (MEMS) sensors are used nowadays in a wide range of applications, from robotics to entertainment. Recently, this technology has also been adopted to equip Inertial Measurement Units (IMUs) replacing traditional electro-mechanical sensors. In this work we present a low-cost embedded IMU which is based on a low-cost embedded microcontroller with limited resources in terms of computing power and memory. The developed software runs on the top of the ERIKA Enterprise real-time kernel to manage the computing tasks that perform sensor data sampling and processing. Low-cost MEMS accelerometers, gyroscopes and magnetometers provide the required data and a Kalman filter analyses raw values in real-time. Experimental results are obtained using a six degrees of freedom anthropomorphic manipulator to drive the IMU with accurate known trajectory, acceleration and rotation. Performances are evaluated both in terms of sensor fusion effectiveness and real-time execution. © 2010 acm.

关键词： computing power

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Prom-oogle: Data mining and integration of on-line databases to discover gene promoters 10

Prom-oogle: Data mining and integration of on-line databases...

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25th Annual acm symposium on applied computing, SAC 2010

作者： Cheng, Dean Sheldon, John Marcet-Palacios, Marcelo Zaïane, Osmar R. Department of Computing Science University of Alberta Canada Department of Medicine University of Alberta Canada

ISBN: (纸本)9781605586380

The vast number of on-line biological and medical databases available can be a great resource for biomedical researchers. However, the different types of data and interfaces available can be overwhelming for many biomedical researchers to learn and make effective use of. Moreover, the available resources lack needed integration. Here we focus on an important task in medical research: to provide researchers with promoter analysis for a given gene. Prom-oogle is a web based data mining tool that provides a means for researchers to take a gene name of interest and obtain its promoter sequence in return after automatic integration of text databases. Additionally, the program is capable of returning multiple promoters from different genes allowing researchers to study how promoters regulate genes. This tool facilitates the process of acquiring information on a promoter and may lead to interesting discoveries. © 2010 acm.

关键词： Genes

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Improving complex distributed software system availability through information hiding 10

Improving complex distributed software system availability t...

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25th Annual acm symposium on applied computing, SAC 2010

作者： Wang, Li Leiferman, Yair Ren, Shangping Kwiat, Kevin Li, Xiaowei Department of CS Illinois Institute of Technology Chicago IL 60616 United States Cyber Science Branch Air Force Research Laboratory AFRL/RIGG Rome NY 13441-4505 United States Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China

ISBN: (纸本)9781605586380

For distributed software systems, ensuring their availability under intentional attacks is critical. Traffic analysis, conducted by the attacker, could reveal the protocol being carried out by the components. Furthermore, having inferred the protocol, the attacker can use the pattern of the messages as a guide to the most critical components. We thwart these directed attacks by using message forwarding to reduce traffic differences, thus diverge attackers from targeted attack to random attack, which probabilistically prolongs the availability of important components in the system. The simulation results also show that message forwarding effectively balance the traffic flow and hence indicate the validity of our approach. © 2010 acm.

关键词： Computer software

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Filtering spams using the minimum description length principle 10

Filtering spams using the minimum description length princip...

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25th Annual acm symposium on applied computing, SAC 2010

作者： Almeida, Tiago A. Yamakami, Akebo Almeida, Jurandy School of Electrical and Computer Engineering University of Campinas - UNICAMP 13083-970 Campinas SP Brazil Institute of Computing University of Campinas 13083-970 Campinas SP Brazil

ISBN: (纸本)9781605586380

Spam has become an increasingly important problem with a big economic impact in society. Spam filtering poses a special problem in text categorization, of which the defining characteristic is that filters face an active adversary, which constantly attempts to evade filtering. In this paper, we present a novel approach to spam filtering based on the minimum description length principle. The proposed model is fast to construct and incrementally updateable. Additionally, we offer an analysis concerning the measurements usually employed to evaluate the quality of the anti-spam classifiers. In this sense, we present a new measure in order to provide a fairer comparison. Furthermore, we conducted an empirical experiment using six well-known, large and public databases. Finally, the results indicate that our approach outperforms the state-of-the-art spam filters. © 2010 acm.

关键词： Learning systems

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Inductive reasoning and semantic web search 10

Inductive reasoning and semantic web search

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25th Annual acm symposium on applied computing, SAC 2010

作者： D'Amato, Claudia Esposito, Floriana Fanizzi, Nicola Fazzinga, Bettina Gottlob, Georg Lukasiewicz, Thomas Dipartimento di Informatica Università di Bari Italy DEIS Università Della Calabria Italy University of Oxford United Kingdom Computing Laboratory Oxford-Man Institute of Quantitative Finance United Kingdom Computing Laboratory Institut für Informationssysteme TU Wien Austria

ISBN: (纸本)9781605586380

Extensive research activities are recently directed towards the Semantic Web as a future form of the Web. Consequently, Web search as the key technology of the Web is evolving towards some novel form of Semantic Web search. A very promising recent approach to such Semantic Web search is based on combining standard Web search with ontological background knowledge and using standard Web search engines as the main inference motor of Semantic Web search. In this paper, we propose to further enhance this approach to Semantic Web search by the use of inductive reasoning. This adds the important ability to handle inconsistencies, noise, and incompleteness, which often occur in distributed and heterogeneous environments, such as the Web. We report on a prototype implementation of the new approach and extensive experimental results. © 2010 acm.

关键词： Ontology

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On processing location based top-k queries in the wireless broadcasting system 10

On processing location based top-k queries in the wireless b...

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25th Annual acm symposium on applied computing, SAC 2010

作者： Jung, HaRim Cho, ByungKu Chung, Yon Dohn Liu, Ling Department of Computer Science and Engineering Korea University Seoul Korea Republic of College of Computing Georgia Institute of Technology United States

ISBN: (纸本)9781605586380

In this paper, we explore the problem of processing a novel type of location based queries, named the location based top-k query, which involves both of spatial and non-spatial specifications for data objects in the wireless broadcasting system. We introduce two methods for processing location based top-k queries on the broadcast stream. In the first method, the search algorithm runs on the broadcast aggregate R-tree (aR-tree). However, the aR-tree may deteriorate the search performance, especially in terms of the tuning time. With this problem in mind, we propose a novel index structure, called the bit-vector R-tree (bR-tree), which stores additional bit-vector information to facilitate processing of location based top-k queries. The search algorithm on the broadcast bR-tree is also described. Our simulation experiments demonstrate that the bR-tree method clearly outperforms the aR-tree method in terms of the tuning time, while maintaining similar or better performance in terms of the access time. © 2010 acm.

关键词： Location based services

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Putting Together QoS and Security in Autonomic Pervasive Systems 6

Putting Together QoS and Security in Autonomic Pervasive Sys...

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6th acm symposium on QoS and Security for Wireless and Mobile Networks

作者： Alia, Mourad Lacoste, Marc He, Ruan Eliassen, Frank Univ Oslo Dept Informat N-0316 Oslo Norway

ISBN: (纸本)9781450302753

Current pervasive systems tend to consider security and QoS separately, ignoring the influence of each aspect on the other. This paper presents an adaptation model based on selection of component compositions enabling to capture dynamic and fine-grained trade-offs between both QoS and security in those systems. The model is multi-constraints and utility-based, and takes into account computing resources, the perceived risk level, and user preferences. We illustrate through a case study of a typical Beyond 3G adaptive multimedia streaming service how the model may be applied to find the right balance between different QoS and security dimensions.

关键词： Self-adaptation autonomic computing QoS security software composition

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Efficient mapping and voltage islanding technique for energy minimization in NoC under design constraints 10

Efficient mapping and voltage islanding technique for energy...

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25th Annual acm symposium on applied computing, SAC 2010

作者： Ghosh, Pavel Sen, Arunabha Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ 85287 United States

ISBN: (纸本)9781605586380

Voltage islanding technique in Network-on-Chip (NoC) can significantly reduce the computational energy consumption by scaling down the voltage levels of the processing elements (PEs). This reduction in energy consumption comes at the cost of the energy consumption of the level shifters between voltage islands. Moreover, from physical design perspective it is desirable to have a limited number of voltage islands. Considering voltage islanding during mapping of the PEs to the NoC routers can significantly reduce both the computational and the level-shifter energy consumptions and the communication energy consumption on the NoC links. In this paper, we formulate the problem as an optimization problem with an objective of minimizing the overall energy consumption constrained by the performance in terms of delay and the maximum number of voltage islands. We provide the optimal solution to our problem using Mixed Integer Linear Program (MILP) formulation. We also propose a heuristic based on random greedy selection to solve the problem. Experimental results using E3S benchmark applications and some real applications show that the heuristic finds near-optimal solution in almost all cases in a very small fraction of the time required to achieve the optimal solution. © 2010 acm.

关键词： Network-on-chip

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