检索结果-内蒙古大学图书馆

Improving availability and performance with application-specific data replication

IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 2005年第1期17卷 106-120页

作者： Gao, L Dahlin, M Nayate, A Zheng, JD Iyengar, A Univ Texas Dept Comp Sci Austin TX 78712 USA IBM Corp Res TJ Watson Res Ctr Yorktown Hts NY 10598 USA

The emerging edge services architecture promises to improve the availability and performance of Web services by replicating servers at geographically distributed sites. A key challenge in such systems is data replication and consistency, so that edge server code can manipulate shared data without suffering the availability and performance penalties that would be incurred by accessing a traditional centralized database. This article explores using a distributed object architecture to build an edge service data replication system for an e-commerce application, the TPC-W benchmark, which simulates an online bookstore. We take advantage of application-specific semantics to design distributed objects that each manages a specific subset of shared information using simple and effective consistency models. Our experimental results show that by slightly relaxing consistency within individual distributed objects, our application realizes both high availability and excellent performance. For example, in one experiment, we find that our object-based edge server system provides five times better response time over a traditional centralized cluster architecture and a factor of nine improvement over an edge service system that distributes code but retains a centralized database.

关键词： availability data replication distributed objects edge services performance Wide Area Networks ( WAN)

来源：评论

学校读者我要写书评

暂无评论

Scalable consistency protocols for distributed services

引用

IEEE TRANSACTIONS ON PARALLEL AND distributed SYSTEMS 1999年第9期10卷 888-903页

作者： Ahamad, M Kordale, R Georgia Inst Technol Coll Comp Atlanta GA 30332 USA Silicon Graph Inc Scalable Informat Syst Mt View CA 94087 USA

A common way to address scalability requirements of distributed services is to employ server replication and client caching of objects that encapsulate the service state. The performance of such a system could depend very much on the protocol implemented by the system to maintain consistency among object copies. We explore scalable consistency protocols that never require synchronization and communication between all nodes that have copies of related objects. We achieve this by developing a novel approach called local consistency (LC). LC based protocols can provide increased flexibility and efficiency by allowing nodes control over how and when they become aware of updates to cached objects. We develop two protocols for implementing strong consistency using this approach and demonstrate that they scale better than a traditional invalidation based consistency protocol along the system load and geographic distribution dimensions of scale.

关键词： scalable services distributed objects replication caching consistency protocols

来源：评论

学校读者我要写书评

暂无评论

Lightweight Named Object: An ICN-Based Abstraction for IoT Device Programming and Management

引用

IEEE INTERNET OF THINGS JOURNAL 2019年第3期6卷 5029-5039页

作者： Bracciale, Lorenzo Loreti, Pierpaolo Detti, Andrea Paolillo, Riccardo Melazzi, Nicola Blefari Univ Roma Tor Vergata Dept Elect Engn I-00133 Rome Italy Consorzio Nazl Interuniv Telecomunicaz UDR Roma Tor Vergata I-00133 Rome Italy

The expected dramatic growth of connected things raises the issue of how to efficiently organize them, in order to monitor and manage functions and interactions. Information centric networking (ICN) is a communication paradigm that provides content-oriented functionality in the network and at the network level, including content routing, caching, multicast, mobility, data-centric security, and a flexible namespace. Thus, it is a viable solution for supporting Internet of Things (IoT) services without requiring any centralized entity. In this paper, we introduce the lightweight named object solution: a convenient way to represent physical IoT objects in a derived name space, exploiting ICN. We show that this abstraction can: 1) increase the programming simplicity;2) offer extended functionality, such as augmentation and upgrading, to cope with the "software erosion," and 3) implement a common interaction logic involving mutual function invocation. We present some proof-of-concept implementations of the proposed abstraction dealing with challenging IoT test cases;we also carry out a performance evaluation in a simulated network scenario.

关键词： Augmentation data-centric security distributed objects information centric networking (ICN) Internet of Things (IoT) named data networking (NDN) naming programming language

来源：评论

学校读者我要写书评

暂无评论

PCB - A distributed computing system in CORBA

引用

JOURNAL OF PARALLEL AND distributed COMPUTING 2000年第10期60卷 1293-1310页

作者： Xu, CW He, B Georgia So Univ Math & Comp Sci Statesboro GA 30460 USA

CORBA (common object request broker architecture) provides a conceptual software bus for distributed object systems, which is not only suitable for enterprise distributed computing, but also suitable for parallel-distributed scientific computations. This paper describes a distributed computing system, named PCB (parallel component bus), based on a cluster of computers with the Java/CORBA technologies. The architecture of the system supports scalability in either SPMD or MIMD models. The measured performance of a parallel computation shows that the system can reach N-fold speedup for large grain applications, (C) 2000 Academic Press.

关键词： distributed computing system CORBA parallel-distributed computing distributed objects

来源：评论

学校读者我要写书评

暂无评论

Embedding standard distributed object-oriented middlewares in wireless sensor networks

引用

WIRELESS COMMUNICATIONS & MOBILE COMPUTING 2009年第3期9卷 335-345页

作者： Moya, F. Villa, D. Villanueva, F. J. Barba, J. Rincon, F. Lopez, J. C. Univ Castilla La Mancha Sch Comp Sci E-13071 Ciudad Real Spain

This paper provides an analysis of the design space available to middleware developers in the context of wireless sensor networks (WSN). We identify the weaknesses of current communication abstraction layers and propose alternative implementation techniques that preserve most Of the useful features but minimize the implementation cost in resource constrained wireless sensor nodes. Our proposal includes a whole WSN development framework based on standard distributed objects and a set of specific services designed to support highly dynamic and scalable WSN applications. Copyright (c) 2007 John Wiley & Sons, Ltd.

关键词： distributed objects sensor middleware device interoperability

来源：评论

学校读者我要写书评

暂无评论

The Dow Chemical project: Creating a web-based interface to a dynamic simulation

引用

COMPUTER APPLICATIONS IN ENGINEERING EDUCATION 2006年第4期13卷 250-256页

作者： Kuriyan, K Muench, W Reklaitis, GV Purdue Univ Sch Chem Engn W Lafayette IN 47907 USA

in this study we present a Web-based interface to a dynamic simulation. The simulation is based on an emulsion polymerization process operated by the Dow Chemical Company. We also describe the software architecture that allows simulation updates to be transmitted dynamically across a network, from a server-based simulation to a Web-based client. (c) 2005 Wiley Periodicals, Inc. Comput Appl Eng Educ 13: 250-256, 2005;Published online in Wiley InterScience (***);DOI 10.1002/cae.20049

关键词： Java distributed objects dynamic simulation emulsion polymerization

来源：评论

学校读者我要写书评

暂无评论

Using distributed object technologies in telecommunications network management

引用

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2000年第5期18卷 644-653页

作者： Pavlou, G Univ Surrey Sch Elect Engn & Informat Technol Ctr Commun Syst Res Guildford GU2 5XH Surrey England

The Telecommunications Management Network (TMN) has been developed as the framework to support administrations in managing telecommunications networks. It suggests the use of OSI Systems Management (OSI-SM) as the technology for management information exchanges. distributed object technologies, such as the Common Object Request Broker architecture (CORBA), address the use of software application program interfaces (API's) in addition to interoperable protocols. Their use in TMN has been the subject of intensive research in recent Sears, with most approaches focusing on interoperability aspects with OSI-SM In this paper we examine the issues behind using distributed object technologies in TMN via a native fashion, with network elements supporting distributed objects directly, e.g., a "CORBA to the switch" approach. The proposed solution tries to maintain the full OSI-SM expressive power in a may that other solutions have not attempted before. Performance and scalability issues are considered,while the approach has been validated through implementation.

关键词： CORBA distributed objects ODP OSI-SM TMN

来源：评论

学校读者我要写书评

暂无评论

Design issues in mobile-agent programming systems

引用

IEEE CONCURRENCY 1998年第3期6卷 52-+页

作者： Karnik, NM Tripathi, AR Univ Minnesota Dept Comp Sci Minneapolis MN 55455 USA

This article describes the mobile-agent paradigm, which is becoming increasingly popular for network-centric programming, and compares it with earlier paradigms for distributed computing from which it has evolved. The design of mobile-agent systems requires that several system-level issues be resolved, such as the provision of code mobility, object naming, portability, scalability, and a range of security issues that go hand-in-hand with mobile code. Agent programming requires suitable languages and programming models that can support code mobility and runtime systems that provide some fundamental primitives for the creation, migration, and management of agents. The authors discuss these requirements and describe several mobile-agent systems that illustrate different approaches designers have taken to address the problems.

关键词： Mobile Agents Mobile Code distributed objects distributed Computing

来源：评论

学校读者我要写书评

暂无评论

Evaluation of composite object replication schemes for dependable server applications

引用

INFORMATION AND SOFTWARE TECHNOLOGY 2006年第9期48卷 795-806页

作者： Katsaros, Panagiotis Iakovidou, Nantia Soldatos, Theodoros Aristotle Univ Thessaloniki Dept Informat Thessaloniki 54124 Greece

Object oriented dependable server applications often rely on fault-tolerance schemes, which are comprised of different replication policies for the constituent objects (composite replication schemes). This paper introduces a simulation-based evaluation approach for quantifying the tradeoffs between fault-tolerance overhead and fault-tolerance effectiveness in composite replication schemes. Compared to other evaluation approaches: (a) we do not use the well-known reliability blocks based simulation, but a hybrid reliability and system's traffic simulation and (b) we make a clear distinction between the measures used for the fault-affected service response times from those used for the fault-unaffected ones. The first mentioned feature allows taking into account additional concerns other than fault-tolerance, like for example load balancing and multithreading. The second feature renders the proposed approach suitable for design studies that aim to determine either optimal replication properties for the constituent objects or quality of service (QoS) guarantees for the perceived service response times. We obtain results for a case system model, based on different assumptions on what happens when server-objects fail (loss scenarios). The presented results give insight in the design of composite method request-retry schemes with appropriate request timeouts. (c) 2005 Elsevier B.V. All rights reserved.

关键词： fault-tolerance performance quality of service distributed objects simulation

来源：评论

学校读者我要写书评

暂无评论

High security Web servers and gateways

引用

COMPUTER NETWORKS AND ISDN SYSTEMS 1997年第8-13期29卷 927-938页

作者： Edwards, N Rees, O Hewlett-Packard Laboratories Bristol Filton Road Stoke Gifford Bristol UK BS12 6QZ

This paper describes a high security, high performance system for making legacy systems accessible to the web. It combines distributed object technology with a trusted operating system that implements multi-level security. The aim is to satisfy the growing demand for dynamic content generation, while providing a high level of protection against unauthorized access to the service. HP CORBAweb is a software infrastructure that allows access to CORBA applications from the web. HP VirtualVault is a secure environment for web applications. The paper gives overviews of both VirtualVault and CORBAweb, and describes the object gateway that merges the integration features of CORBAweb with the security of VirtualVault. The paper describes the authorization model that determines the granularity at which access is granted. It then goes on to explain how the system can be extended to allow remote clients, such as Java applets, to invoke the CORBA-based services directly, using the Internet Inter-ORE Protocol (IIOP). The object gateway is designed to be used to provide controlled access through a firewall protecting the servers. Some of the issues associated with firewalls around the clients are discussed at the end of the paper. (C) 1997 Published by Elsevier Science B.V.

关键词： security gateways trusted operating system multilevel security CORBA distributed objects World Wide Web

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：