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7th International Conference on Computer-Aided Industrial Design and Conceptual Design (CAID&CD)

作者： Wu, Ai Liu, Xinsong Liu, Kejian Univ Elect Sci & Technol China Sch Comp Sci Chengdu 610054 Peoples R China

ISBN: (纸本)9781424406838

Microscopic traffic simulation is effective for analyzing transportation networks, and distributed simulation modeling is the optimal approach for the simulation. In this paper, a pure distributed modeling framework (called DMTSS) for large-scale traffic simulation is proposed. DMTSS consists of low-cost PCs networked by high-speed local area network, the heavy computational task is divided into multiple light subtasks according to transportation subnets, and subtasks are distributed to these PCs. A distributed database is used to hold necessary data, and a distributed synchronization mechanism is employed to improve the efficiency of synchronization. To ensure the system stably running for long time, the failure recovery scheme is presented to recover the system from error state. Implemented details such as communication and are also discussed. Analyses indicate that the proposed framework is scalable and reliable and effective.

关键词： microscopic traffic simulation distributed model synchronization mechanism distributed database failure recovery

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Grid services for SST measures

Grid services for SST measures

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IEEE Symposium on Virtual Environments, Human-Computer Interfaces and Measurement Systems

作者： Guerriero, Andrea Matarrese, Raffaella Morea, Alberto Pasquale, Ciriaco Ragni, Francesco Tijani, Khalid Politecn Bari Dept Elect & Elect Via Re David 200 I-70100 Bari BA Italy Politecn Bari Dept Phys Bari Italy

ISBN: (纸本)9781424408191

The effects of the increase in the average temperature of the Earth's near-surface air and oceans in recent decades are dramatically manifest: desertification, glacier retreat, increased intensity and frequency of hurricanes and extreme weather events. Monitoring the ecosystem is currently the only way we have to assist Governments in making sound decisions concerning the reduction of these dramatic effects and the protection of our environment. Satellite remote sensing data, offering the possibility of covering large spatial area with a high temporal frequency, represents the ideal solution to monitoring, but the huge data volume to process, calibrate and validate by in-situ dataset, cannot be operated effectively by traditional database and computational resources. Grid technology, easily providing powerful computational resources and efficient distributed data management, is an excellent solution for remote sensed data processing and management system. In this paper we present a prototype of a Remote Sensed Data processing system on Grid technology that allows, by a graphical interface, data selection and processing to validate SST measure particularly in costal area.

关键词： Sea Superfice Temperature SST measure MODIS GRID Globus toolkit 4.0 distributed database

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Managing Neighbor Replication Transactions in distributed Systems

Managing Neighbor Replication Transactions in Distributed Sy...

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2006年国际电子、工程及科学领域的分布式计算和应用学术研讨会

作者： Noraziah Ahmad Mustafa Mat Deris Norhayati Rosli Yazid Mohd Saman Rabiei Mamat W.N.Wan Nik Shuhadah Faculty of Comp.System & Software Engineering University College of Engineering & Technology Malaysia Mustafa Mat Deris Faculty of Information & Technology Multimedia University College of Technology Tun Hussein Onn Group Faculty Chemical Engineering & Natural Resources University College of Engineering & Technology Malaysia Faculty of Science and Technology University College of Science & Technology Malaysia

This paper presents a new design to manage neighbor replication for distributed database *** address how to build reliable system for managing transaction on Neighbor Replication Grid(NRG) in terms to preserve the data consistency and support advance *** first recall the model and technique of NRG that impose neighbors binary vote assignment to its logical grid structure on data *** on this model,we extent our work to design system for managing NRG transaction both in normal and failure *** present a result of correctness study on the system and finally an implementation of the system.

关键词： distributed database Replication Consistency Transaction Model Transaction Processing and Correctness

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分布异构多数据库中多副本一致性维护研究与实现

分布异构多数据库中多副本一致性维护研究与实现

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第二十三届中国数据库学术会议

作者：贾艳燕娄燕飞杨树强贾焰国防科技大学计算机学院

1前言基于分布式数据库系统的大型企业应用越来越广泛,为了提高系统可用性和安全性,系统中的关键数据会在不同地域存有多个副本。保持多个副本间的数据一致性是分布式数据库系统中的一个关键技术。

关键词： distributed database Data consistency Data replication Data synchronization Asynchronous replication

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一种基于多副本均衡负载的多元联接查询优化算法

一种基于多副本均衡负载的多元联接查询优化算法

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第二十三届中国数据库学术会议

作者：梁雄友薛永生厦门大学计算机科学系东莞塘厦理工学校

1前言查询优化是分布式数据库系统中的核心问题。如文[9]所描述那样,同为一个分布式多元联接,用不同的方法实现所花的时间从1秒、16.7秒、28小

关键词： distributed database Dynamic load balance Multi-join queries Query optimization Parallel

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Living with database conflicts: A temporal branching technique

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distributed AND PARALLEL databaseS 2005年第3期17卷 251-265页

作者： Gelbard, R Spiegler, I Bar Ilan Univ Grad Sch Business Adm Informat Syst Program IL-52900 Ramat Gan Israel Tel Aviv Univ Recanati Grad Sch Management Technol & Informat Syst Program IL-69978 Tel Aviv Israel

Heterogeneous as well as distributed databases make data conflicts inevitable. Both tolerate the entry of conflicting values in data objects, e.g., the value "female" may be entered by one user whereas another may put "male" in the same data object. Such inconsistencies in databases are common and are resolved routinely by built in structured mechanisms. Unresolved conflicts are typically quarantined till they can be resolved. But, there are situations for which there are no structured mechanisms to resolve conflicts while having to maintain application flow. Moreover, there are situations, i.e., medical or financial environments, in which conflicts must be stored so that their effects be analyzed for decision making. The current research proposes a model and a technique for living with database conflicts. The technique, named Temporal Branching, integrates and extends temporal oriented databases, temporal versioning, and log-file approaches and offers a solution and flexible structure readily accessible to retrieval and audits by standard DBMS software. A case study in health care delivery system is given to illustrate the problem and proposed solution.

关键词： temporal oriented databases distributed database conflict resolution data integrity temporal versioning check point rollback and recovery

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Application of Grid-enabled technologies for solving optimization problems in data-driven reservoir studies

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FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE 2005年第1期21卷 19-26页

作者： Parashar, M Klie, H Catalyurek, U Kurc, T Bangerth, W Matossian, V Saltz, J Wheeler, MF Rutgers State Univ Dept Elect & Comp Engn TASSL Piscataway NJ 08855 USA Univ Texas CSM ICES Austin TX 78712 USA Univ Texas Inst Geophys Austin TX 78712 USA Ohio State Univ Dept Biomed Informat Columbus OH 43210 USA

This paper presents the use of numerical simulations coupled with optimization techniques in oil reservoir modeling and production optimization. We describe three main components of an autonomic oil production management framework. The framework implements a dynamic, data-driven approach and enables Grid-based large scale optimization formulations in reservoir modeling. (C) 2004 Elsevier B.V. All rights reserved.

关键词： grid computing optimization algorithms distributed database

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Event-synchronized data acquisition system for the SPring-8 linac beam position monitors

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2005年第2-3期543卷 415-430页

作者： Masuda, T Fukui, T Tanaka, R Taniuchi, T Yamashita, A Yanagida, K SPring-8 1-1-1 Kouto Mikazuki Hyogo 6795198 Japan

By the summer of 2003, we had completed the installation of a new non-destructive beam position monitor (BPM) system to facilitate beam trajectory and energy correction for the SPring-8 linac. In all, 47 BPM sets were installed on the 1-GeV linac and three beam-transport lines. All of the BPM data acquisition system was required to operate synchronously with the electron beam acceleration cycle. We have developed an event-synchronized data acquisition system for the BPM data readout. We have succeeded in continuously taking all the BPMs data from six VME computers synchronized with the 10 pps operation of the linac to continuously acquire data. For each beam shot, the data points are indexed by event number and stored in a database. Using the real-time features of the Solaris operating system and distributed database technology, we currently have achieved about 99.9% efficiency in capturing and archiving all of the 10 Hz data. The linac BPM data is available for off-line analysis of the beam trajectory, but also for real-time control and automatic correction of the beam trajectory and energy. (c) 2005 Elsevier B.V. All rights reserved.

关键词： data acquisition system beam position monitors event synchronization shared memory network distributed database process scheduling

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Resolving clinicians' queries across a grid's infrastructure

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METHODS OF INFORMATION IN MEDICINE 2005年第2期44卷 149-153页

作者： Estrella, F del Frate, C Hauer, T McClatchey, R Odeh, M Rogulin, D Amendolia, SR Schottlander, D Solomonides, T Warren, R Univ W England CCCS Res Ctr Bristol BS16 1QY Avon England Univ Udine Ist Radiol I-33100 Udine Italy CERN ETT Div Geneva Switzerland Mirada Solut Ltd Oxford England Addenbrookes Hosp Breast Care Unit Cambridge England

Objectives: The post decade has witnessed order of magnitude increases in computing power, data storage capacity and network speed, giving birth to applications which may handle large data volumes of increased complexity, distributed over the internet. Methods: Medical image analysis is one of the areas for which this unique opportunity likely brings revolutionary advances both for the scientist's research study and the clinician's everyday work. Grids [I] computing promises to resolve many of the difficulties in facilitating medical image analysis to allow radiologists to collaborate without having to co-locate. Results. The EU-funded MammoGrid project [2] aims to investigate the feasibility of developing a Grid-enabled European database of mammograms and provide an information infrastructure which federates multiple mammogram databases. This will enable clinicians to develop new common, collaborative and co-operative approaches to the analysis of mammographic data. Conclusion: This paper focuses on one of the key requirements for large-scale distributed mammogram analysis: resolving queries across a grid-connected federation of images.

关键词： distributed database queries meta-data mammography medical image analysis epidemiological studies

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Assurance system architecture for distributed database systems 7

Assurance system architecture for distributed database syste...

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7th IEEE International Symposium on High Assurance Systems Engineering

作者： Leguizamo, CP Syed, AA Mori, K Tokyo Inst Technol Dept Comp Sci Meguro Ku Tokyo 1528552 Japan

ISBN: (纸本)0769517692

Recently with the advent of the information technology and the wide spread use of the Internet, new user oriented production and logistic systems, such as the Supply Chain Management System, have been required in order to cope with the drastic and continuous changes on the markets and users' preferences. To achieve this purpose, the companies need to mutually integrate their database systems with heterogeneous requirements. Autonomous Decentralized database System (ADDS) is proposed as a system architecture in order to realize assurance when distributed database systems with heterogeneous requirements have to coexist in a common environment without violating each other characteristics. In this system architecture, a loose consistency management technology is proposed in order to let each database to autonomously update its own information while preserving the consistency of the total system. The autonomy of each site can be achieved by defining a data attribute, Allowable Volume (AV), at each DB within which each site can update. Moreover, a background coordination technology, performed by an autonomous mobile agent (MA), permits that the sites can coordinate and cooperate each other. The MA moves around the sites in order to continuously adjust and allocate AV by negotiating with them under evolving situations. Furthermore, the effectiveness of this assurance systems is experimentally shown in the supply-chain management system model by simulation.

关键词： distributed database assurance autonomy loose consistency mobile agent

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