In order to satisfy, the complex and various demands of the customers, telecommunication networks must provide their services rapidly and flexibly, with the support of efficient service and network management systems....
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ISBN:
(纸本)0769512305
In order to satisfy, the complex and various demands of the customers, telecommunication networks must provide their services rapidly and flexibly, with the support of efficient service and network management systems. To fulfill these requirements, TINA has appeared as a concept for the advanced telecommunication system using information technology such as distributed processing, object oriented modeling. We mention some problems of developing applications in the TINA service management layer. To solve the problems, we propose the advanced architecture called OMS (object management system), which consists of three managers (data manager, data access manager and metadata registry manager). OMS separates the application layer and the middleware such as ODBC and JDBC. And the application layer and OMS are connected by distributed object middleware based on CORBA. Also in order to manage efficiently managed objects stored in different repositories, we have implemented metadata registry by using the metadata concept.
We present the design, implementation and evaluation of a framework that uses JavaSpaces [1] to support this type of opportunistic adaptive parallel/distributed computing over networked clusters in a non-intrusive man...
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We present the design, implementation and evaluation of a framework that uses JavaSpaces [1] to support this type of opportunistic adaptive parallel/distributed computing over networked clusters in a non-intrusive manner. The framework targets applications exhibiting coarse-grained parallelism and has three key features: (1) portability across heterogeneous platforms, (2) minimal configuration overheads for participating nodes, and (3) automated system state monitoring (using SNMP) to ensure nonintrusive behavior. Experimental results presented in this paper demonstrate that for applications that can be broken into coarse-grained, relatively independent tasks, the opportunistic adaptive parallel computing framework can provide performance gains. Furthermore, the results indicate that monitoring and reacting to the current system state minimizes the intrusiveness of the framework.
The growth of the Internet and the advent of the computational "Grid" have made it possible to develop and deploy advanced computational collaboratories. These systems build on high-end computational resourc...
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The growth of the Internet and the advent of the computational "Grid" have made it possible to develop and deploy advanced computational collaboratories. These systems build on high-end computational resources and communication technologies underlying the Grid, and provide seamless and collaborative access to particular resources, services or applications. Integrating these "focused" collaboratories presents significant challenges. Key among these is the design and development of robust middleware support that addresses scalability, service discovery, security and access control, and interaction and collaboration management for consistent access. The authors first investigate the architecture of such a middleware that enables global (Web-based) access to collaboratories. They then present the design and implementation of a middleware substrate that enables a peer-to-peer integration of and global (collaborative) access to geographically distributed instances of the DISCOVER computational collaboratory for interaction and steering.
As every information system becomes connected to every other information system, they form the so-called "information utility". This is the domain in which contemporary distributed systems have to operate. N...
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As every information system becomes connected to every other information system, they form the so-called "information utility". This is the domain in which contemporary distributed systems have to operate. New applications have to be evolved on this platform of existing systems that may hold inconsistent information. Consequently, solutions need to be able work in a world of only partially correct information. In this paper, we discuss means whereby architects, designers and engineers may, in this context of information inconsistency, develop new business solutions and reason about their validity. In particular we describe the properties of inter-enterprise system architectures for applications working with partially replicated and partially consistent information. These must be able to operate under reversible assumptions and to undo operations as a consequence of reversing assumptions. We have developed exemplary architectures that exhibit these properties, used them to investigate the concept of inconsistency-tolerant components and begun to devise methods of building inter-enterprise applications from such components. This approach, we conjecture, makes reasoning about the validity of proposed inter-enterprise scale solutions more straightforward and thus increases the speed with which new solutions can be deployed. We are evaluating these ideas now, by building, along with our industrial collaborators, realistic enterprise-scale demonstrations in the domains of Finance and Defence.
This paper reports on an ongoing research project aimed at designing and deploying a COMA Commodity Grid (COG) Kit. The overall goal of this project is to explore how commodity distributed computing technologies and s...
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Broadband integrated services digital networks (B-ISDN) are aimed to transport both real-time traffic and non real-time traffic. Many of these applications require quality of service (QoS) guarantees. In the literatur...
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ISBN:
(纸本)0769511864
Broadband integrated services digital networks (B-ISDN) are aimed to transport both real-time traffic and non real-time traffic. Many of these applications require quality of service (QoS) guarantees. In the literature, not much work is found to provide QoS guarantees based on fault tolerance. Reliability of network links is considered as one of the parameters when providing QoS guarantees to applications. Considering reliability of network links as a parameter for QoS guarantees gives the applications more flexibility in choosing the network resources. A new terminology for dispersity routing is presented which will be useful in providing QoS guarantees based on reliability. Dispersity routing transmits the traffic along multiple paths. Also, a reliable backup resource allocation method is presented that can be used in the context of dispersity routing for fault tolerant real-time networks. An assumption is made that higher capacity is assigned to the links which are more reliable. This will help in availability of resources for a longer period of time. Also, reliability of links is considered to compute multiple paths along with shortest path metric.
Estimation of the defect content is important to enable quality control throughout the software development process. Capture-recapture methods and curve fitting methods have been suggested as tools to estimate the def...
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ISBN:
(纸本)0769513069
Estimation of the defect content is important to enable quality control throughout the software development process. Capture-recapture methods and curve fitting methods have been suggested as tools to estimate the defect content after a review. The methods are highly reliant on the quality of the data. If the number of reviewers is fairly small, it becomes difficult or even impossible to get reliable estimates. This paper presents a comprehensive study of estimates based on two reviewers, using real data from reviews. Three experience-based defect content estimation methods are evaluated vs. methods that use data only from the current review. Some models are possible to distinguish from each other in terms of statistical significance. In order to gain an even better understanding, the best models are compared subjectively. It is concluded that the experience-based methods provide some good opportunities to estimate the defect content after a review.
This paper introduces the invocation profile as the basis for a suite of metrics to indicate the presence and mix of object-oriented mechanisms in a system written in an object-oriented language. This addresses concer...
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This paper presents a mechanism for active resource management (ARM) in a differentiated services environment.. While the differentiated services architecture and the bandwidth broker agent provide a mechanism for QoS...
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ISBN:
(纸本)0769515282
This paper presents a mechanism for active resource management (ARM) in a differentiated services environment.. While the differentiated services architecture and the bandwidth broker agent provide a mechanism for QoS management through resource reservation, this mechanism is based on a static provisioning of resources. As bandwidth requirements are typically dynamic, such a static reservation approach can either lead to wasted bandwidth or leave applications resource-starved. The active resource management approach presented in this paper addresses this problem by dynamically, reallocating resources based on current network state and applications requirements. An implementation and evaluation of ARM using the NS-2 simulation toolkit is also presented.
This paper presents a softwareengineering process that includes family-based aspects for aero-engine control software. The process uses a "family capability" derived from family analysis of the embedding sy...
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