英语翻译1 IntroductionThe positive effects that cooperation has

英语翻译
1 Introduction
The positive effects that cooperation has on so many important outcomes,make cooperative learning one of the most valuable tools educators have [4].Students,teachers and researchers interact,exchange their ideas and share their data in cooperative learning systems.These systems are based on
client-server concept where the data storage and computation are centralized on a small number of high-end servers.As the number of active clients and available information is simultaneously
increasing,servers will hardly handle this increment.Redesigning these systems in a more distributed,resource sharing fashion using the Peer-to-Peer approach is a more scalable and robust solution [5].
The term peer-to-peer refers to a class of systems and applications that employ distributed resources to perform a critical function in a decentralized manner.The resources encompass computing power,data (storage and content),network bandwidth,and presence (computers,human,and other resources).Thecritical function can be distributed computing,data/content sharing,communication and collaboration,or platform services [6].In P2P systems a very large number of autonomous computing nodes (the peers) pool together their resources and rely on each other for data and services.Every node of the system acts as both client and server and provides part of the overall information available from the system.
In this paper we propose and demonstrate the implementation of a course discussion system which operates in a peer-to-peer environment so we have increased the availability of the system services and have reduced hardware commitments.The JXTA grouping service makes it possible to communicate and share data in secure manner under P2P environment.Implementing our system using the JXTA protocols makes it applicable over the internet across firewalls and NATs (Network Address Translations).Using central Lightweight Directory Access Protocol (LDAP) servers for authentication enhances the security of our system concerning the access rights to the services provided by the system
features (i.e.students can’t create or modify any of the sub-peer groups.).As well as the identity consideration,all our system users can verify each other and this will ensure that only reliable and trusted information will be exchanged among our system users.Our system intends to provide a secure
course discussion system where users (students) can have beneficial and secure group chatting and they can share their data (documents,codes,applications etc.) in secure and trusted environment.And by using LDAP server for authentication we verify the access rights of each user in addition to identify all
the system’s users.

1 介绍 合作有在许多重要结果的正面作用,做合作社学会最可贵的工具教育家的当中一个有[ 4 ] .学生、老师和研究员互动,交换他们的想法和分享他们的数据在合作学习系统.这些系统根据 数据存储和计算集中在很小数量的高端服务器的客户服务器概念.如同活跃客户和可利用的信息的数字同时 增加,服务器几乎不将处理这增加.再设计这些系统在一分布,资源分享时尚使用同辈对同辈方法是一种更加可升级和更加健壮的解答[ 5 ] .使用分布的资源执行一个重要功能以分散的方式的期限同辈对同辈提到系统组和应用.资源包含计算能力、数据(存贮和内容),网络带宽,和存在(计算机、人,和其它资源) .Thecritical 作用可能是分配计算,data/content 分享,通信和合作,或平台服务[ 6 ] .在P2P 系统自治计算的结(同辈的) 一个非常大数字一起合并他们的资源和依靠彼此为数据和服务.系统的每个结作为客户机和服务器和提供一部分的整体有用的资料从系统.在本文里我们提出和展示经营在同辈对同辈环境里路线讨论系统的实施因此我们增加了系统服务的可及性和减少了硬件承诺.JXTA 编组的服务使成为可能通信和分享数据以安全方式在P2P 环境之下.实施我们的系统使用JXTA 协议使它可适用在互联网横跨防火墙和NATs (网络地址转换法) .使用中央轻量级目录地址规约(LDAP) 服务器为认证加强我们的系统安全关于存取权对服务由系统提供 特点(即学生无法创造或修改任何次级同辈小组) .并且身分考虑,所有我们的系统用户能核实自己和这将保证只可靠和被信任的信息将被交换在我们的系统用户之中.我们的系统意欲提供安全 追猎用户的讨论系统(学生) 能有有利和安全小组聊天并且他们能分享他们的数据(文件、代码,应用等.) 在安全和被信任的环境里.并且由使用LDAP 服务器为认证我们核实各名用户存取权除之外辨认所有 系统的用户.