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Data protection in distributed database systems

15th International Symposium on Methodologies for Intelligent Systems

作者： Ruani, C Varadharajan, V Univ Western Sydney Sch Comp & Informat Technol Penrith NSW 1797 Australia Macquarie Univ Dept Comp N Ryde NSW 2109 Australia

ISBN: (纸本)3540258787

In this paper, we propose an authorization model for distributed databases. Multiple object granularity of authorizations, such as global relations, fragments and attributes, are supported. Administrative privilege can be delegated from one subject to another to provide decentralized authorization administration. Authorization propagations along both the relation fragmentation tree and the subject group-subgroup hierarchical tree are also considered. Further more, conflict resolution policy is provided that supports well controlled delegations and exceptions. Overall the system provides a very flexible framework for specifying and evaluating the authorizations in distributed database systems.

关键词： distributed database authorization

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A study on multi-tiered architecture of distributed database based on C/S

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11th Joint International Computer Conference (JICC 2005)

作者： Cheng, ZJ Yan, HY Taiyuan Univ Technol Sch Software Taiyuan 030006 Peoples R China

ISBN: (纸本)9812565329

With the database becoming ever-larger, the architecture is developing continually in order that the data and resource can be shared. There are many problems exiting in distributed database Based on C/S. After analyzing the advantage and disadvantage of single-tiered, double-tiered and three-tiered architecture, this paper proposes a solution of multi-tiered architecture. Finally, this paper gives an example of the multi-tiered architecture to demonstrate the advantage of it.

关键词： multi-tiered architecture client/server distributed database

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SIGMCC: A system for sharing meta patient records in a Peer-to-Peer environment

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FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF GRID COMPUTING THEORY METHODS AND APPLICATIONS 2008年第3期24卷 222-234页

作者： Cannataro, Mario Talia, Domenico Tradigo, Giuseppe Trunfio, Paolo Veltri, Pierangelo Magna Graecia Univ Catanzaro Dept Expt & Clin Med I-88100 Catanzaro Italy Univ Calabria DEIS Arcavacata Di Rende Italy

This paper considers the interoperability and information sharing between health care providers. It proposes a distributed Peer-to-Peer (P2P) based framework that enables health operators of different hospitals to share and aggregate clinical information about patients and therapy effects. Patient records are mapped into a simple XML-based meta-Electronic Patient Record (meta-EPR). The meta-EPR is not a standard EPR proposal, but it is a lightweight data structure defined to contain relevant and aggregate information extracted from the different EPRs adopted by each hospital. Hospital operators formulate queries against meta-EPR schema;queries are then distributed to the connected hospitals hosting meta-EPR instances, through a P2P infrastructure. The presented framework has been fully implemented in a system called SIGMCC, which offers an Application Programming Interface (API) for query formulation, data loading and updating. As a case study, an application of the proposed metaEPR to the cancer medical domain has been developed. Finally, SIGMCC implements a view mechanism to allow personal (patient) information protection against unauthorized users. (C) 2007 Elsevier B.V. All rights reserved.

关键词： EPR XML Peer-to-Peer distributed database

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Resource-constrained load balancing controller for a parallel database

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IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY 2008年第4期16卷 834-840页

作者： Tang, Z. Birdwell, J. D. Chiasson, J. Abdallah, C. T. Hayat, M. Univ Tennessee Dept Elect & Comp Engn Knoxville TN 37996 USA Univ Tennessee Dept Elect Engn & Comp Sci Knoxville TN 37996 USA Boise State Univ Dept Elect & Comp Engn Boise ID 83725 USA Univ New Mexico Dept Elect & Comp Engn Albuquerque NM 87131 USA

This brief documents experimental results using a deterministic dynamic nonlinear system for load balancing, previously reported by Tang et al. in a cluster of computer nodes used for parallel computations in the presence of time delays and resource constraints. While previous publications by the authors have provided theoretical analysis of this load-balancing strategy using an idealized model, and have documented experiments using a simulated database, experimental results using a complete database for DNA profiles are documented here. Evaluation of the proposed load-balancing strategy using an actual database was critical because of several characteristics of the database that cannot be accurately captured using either a simulation model or database, including the variation in times required for the database to perform search operations, the time-varying and task-dependent computational load the database imposes upon each node of the parallel computer, and the time-varying network traffic imposed by both the communication of database search requests and results, mixed with the traffic generated by the load-balancing strategy. Although the load-balancing strategy can be represented in a relatively straightforward manner using mathematics, its implementation is by necessity an approximation to its mathematical description. The reported experimental results serve to validate the superiority of using the controller based on the anticipated work loads to a controller based on local work loads, which has been predicted with experiments using a simulated database and documented in prior publications. The experiments demonstrate the efficacy of the load-balancing strategy using an anticipated pattern of work loads and provide support for scalability of the approach.

关键词： cluster computing distributed database load balancing parallel computing time delay

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InfoShare : Information sharing system with a mechanism of selectively cooperative retrieval on hybrid P2P networks

InfoShare : Information sharing system with a mechanism of s...

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7th Asia-Pacific Symposium on Information and Telecommunication Technologies

作者： Ishizaka, Michihiro Inoie, Atsushi Ahiko, Shigelo Ling, Xiao-ping Kanagawa Inst Technol Dept Informat Network & Commun Atsugi Kanagawa 2430292 Japan

ISBN: (纸本)9784885522260

We propose an information sharing system (called InfoShare) which is a set of multiple hybrid peer-to-peer (P2P) networks logically connected to a cooperative server. The design goal of the system is to form a multipurpose distributed database to share various kinds of information distributed on the campus and to access to the Internet website. Each of peers in the campus submits metadata of its own files to a meta-server (called information server) that forms a local database. As each local database may classify those information into different categories, the cooperative server plays an important role to succeed in reconciling paradox among them. When a certain peer retrieves information from the system, the information servers that have metadata included in the query cooperatively search target files. Consequently the peer gets the target file directly from another peer or a website. InfoShare also has a cache mechanism for well-referred files as a countermeasure taken to avoid peer's leaving. Our experimental results show that InfoShare has an excellent retrieval response time and can be effectively adaptable to many applications of campus information sharing.

关键词： information sharing hybrid P2P network distributed database web application

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Security Management Model for Mobile databases Transaction Management

Security Management Model for Mobile Databases Transaction M...

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3rd International Conference on Information and Communication Technologies

作者： Abdul-Mehdi, Ziyad. T. Mahmod, Ramlan Multimedia Univ Fac Informat Sci & Technol Selangor Malaysia Univ Putra Malaysia Fac Comp Sci & Informat Technol Serdang 43400 Malaysia

ISBN: (纸本)9781424417513

Mobile database permeates into today's computing and communication area;we envision application infrastructures that will increasingly rely on mobile technology. Transaction's security of database will need to integrate peer-to-peer mobile environment: people and computers. In this paper we develop a security model for transaction management framework for peer-to-peer environments. A key requirement in such an environment is to support and secure frequent disconnection of mobile database. We present algorithms that implement this framework in an asynchronous and synchronous system.

关键词： distributed database Transaction management Security

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A coordinated design framework for power system automation

A coordinated design framework for power system automation

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12th International Middle East Power System Conference

作者： El-Kashlan, Shady A. AAST Elect & Comp Control Engn Dept Alexandria Egypt

ISBN: (纸本)9781424419333

This paper presents a coordinated design of power automation platform for integrating the various power automation sub-systems. It closely follows the IEC standards (IEC61970, IEC61968, IEC61850) and meets the high demands on operation performance, reliability, expandability, openness and security of modern power system control and management. The design introduces two new concepts: Operation Oriented Architecture (OOA) and Multiple Redundancy, or 1xM redundancy. It also includes a high speed open database connection to various RDBMS databases and an open interface layer to different computer operating systems. Other advanced features are also provided in the new design, including the distributed real time database, the data subscribing mechanism, GUI-based data model editing tools and the full version management mechanisms.

关键词： power system automation multi-agent distributed database Multiple Redundancy (1xM) operating system independent

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Research of Port Bulk Logistics Comprehensive Information Integrated Platform

Research of Port Bulk Logistics Comprehensive Information In...

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IEEE International Conference on Automation and Logistics

作者： Yu, Jing Liu, Guangzhong Shanghai Maritime Univ Coll Commun & Transportat Shanghai Peoples R China Shanghai Maritime Univ Coll Informat Engn Shanghai Peoples R China

ISBN: (纸本)9781424425020

The comprehensive information integrated platform on port bulk logistics is constructed on the basis of system analysis and design in terms of hierarchical structure, logic structure and physical structure. The technology of data mining, distributed database and information integrated are adopted to realize the function of sharing resource, decision-support and information-transparent. The system will improves the performance of port bulk logistics organization, shortens the circle period of vehicle and ship, enhances the port capacity and efficiently reduces the occurrence of ship waiting for cargo or cargo waiting for ship in port.

关键词： port bulk logistics information integrated data mining distributed database supply chain management

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Selective Data Replication for distributed Geographical Data Sets

Selective Data Replication for Distributed Geographical Data...

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作者： Gu, Xuan University of Canterbury

学位级别：master

The main purpose of this research is to incorporate additional higher-level semantics into the existing data replication strategies in such a way that their flexibility and performance can be improved in favour of both data providers and consumers. The resulting approach from this research is referred to as the selective data replication system. With this system, the data that has been updated by a data provider is captured and batched into messages known as update notifications. Once update notifications are received by data consumers, they are used to evaluate so-called update policies, which are specified by data consumers containing details on when data replications need to occur and what data needs to be updated during the replications

关键词： data replication distributed database ontology geographical information system

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Model and adaptive configuration management strategy for a distributed database server system

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Jisuanji Yanjiu yu Fazhan/Computer Research and Development 2005年第1期42卷 126-133页

作者： Tian, Junfeng Liu, Yuling Du, Ruizhong Dept. of Comp. Sci. and Technol. Univ. of Sci. and Technol. of China Hefei 230027 China Inst. of Comp. Network Technol. Hebei Univ. Baoding 071002 China

Server redundancy technology solves the problem of availability and the performance bottleneck in the traditional distributed environment, and at the same time presents a new challenge to the system management. A kind of constituting principle and working model of a distributed database server system (DDSS) is presented in this paper. To overcome the weakness of dynamic scalability of redundancy resource in configuration management of the present redundancy server system, aiming at the server DDSS (every service in the system is abstracted to an object class in the model, and multi-instance of the same object class redundantly serving each other is proposed), the configuration management of redundancy resource is discussed, and adaptive configuration management policy based on mobile agent technology is proposed. With the precondition of ensuring the system availability, the system performance is improved and the resource waste is reduced. In ACM, by defining award-penalty function (as for static configuration) and user request arriving rate (as for dynamic configuration) which is the gist of configuration, redundancy instances is added or deleted dynamically. Finally, the algorithmic performance is analyzed and tested, and compared with traditional algorithm.

关键词： Configuration management distributed database Mobile agent Performance analysis Redundancy

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