A web-based sensor network system with distributed data processing approach via web application

We have proposed a Web-based sensor network constructed of Web-based sensor nodes and a remote management system. The Web-based sensor nodes consist of communication units and measurement devices with Web servers. The management system has intelligent processing and rule-based function to manage them flexibly via the Internet and performs various image analyses easily with Web application services. By distributing the image analyses to Web application services, our proposed system provides versatile and scalable data processing. We demonstrated that it can realize the desired image analyses effectively and perform complicated management by changing its operations depending on the results of analysis.     

关于校园网接入互联网上网管理计费解决方案

介绍了一个校园网接入互联网的上网管理计费的方案 ,该方案所采用的 Dr.COM2 0 33BMG计费管理网关系列产品是局部网络内部用户接入互联网的验证、授权、用户管理和计费服务器 ,同时还是一个两个交换式以太网口的路由器 ,提供完善的网络管理计费统计软件 ,提供多种计费方式 ,并能对用户的上网记录和使用流量等数据进行统计和整理。是性价比很高的优秀软件     

Engineering Web technologies for embedded applications

The founder of Agranat Systems examines the design issues involved in engineering effective Web technologies for embedded systems. Small embedded TCP/IP stacks and Web server software now make it possible to manufacture reliable, inexpensive Web-enabled devices across many industries and markets. Embedded systems require Web servers that are designed to minimize memory footprint and avoid interference with mission-critical and real-time applications. To guarantee a reliable user interface with minimal impact on system performance, the server software should utilize the latest HTTP 1.1 standards from the Internet Engineering Task Force. It won't be long before intelligent devices worldwide will be nodes on a network and managed from Web browsers     

异类DAN的一致Web管理模型的研究

基于嵌入式Internet技术Web管理技术，针对各种设备域网络DAN(Device Atea Network)的一致化网络管理，提出了一个对异类设备域网络DAN进行一致管理的Web模型，解决了家庭、企业设备环境中异类网络的一致性管理、Web化管理等问题。该模型是一个以嵌入式设备网关和嵌入式网络网关为主框架的四层结构，集成了Java技术、SNMP协议(Simple Network Management Protocol)、WBDM(Web-based Device Management)管理模型中的EWS(Embedded Web Server)等技术，形成了一个开放的、通用性强的、跨平台的Web管理框架，为嵌入式系统管理员在任何时间和任何地点提供了友好的、平台无关的、易于使用的远程监控嵌入式设备的方法。     

基于嵌入式Web服务器的网络设备测控系统设计

面向Internet是设备网络化设计的发展方向。介绍了互联网在嵌入式设备中的应用，说明了基于嵌入式Web服务器的网络智能设备测控系统的设计方案和软、硬件的实现。硬件上选用Rabbit 2000网络微处理器作为网络接口的Web服务器，构建嵌入式SoC Web服务器，底层软件采用Dynamic C软件开发环境。详细阐述了构建嵌入式Web服务器的具体技术及相关的实现方案，以及实现用TCP、UDP报文进行网络通信、串行口数据通信和对网络智能设备的测控技术等，并给出相关系统软件的程序代码及流程图。目前该系统的运行效果良好。     

Collaborative work

Organizations are increasingly using intranets to provide information services. Standard Web technologies, including the browser-based user interface, are now used inside organizational network boundaries to relay everything from organizational policy to up-to-the-minute series figures. The authors discuss the use of Web-based tool servers and personal tool services     

嵌入式Web技术在网管系统中的应用

SNMP是目前主流的嵌入式管理技术，广泛应用在交换机，路由器等产品中，同时基于Web的管理近年来发展很快，它已成为网络管理的趋势之一，因此只有嵌入式设备中同时集成SNMP和Web功能，才能适应市场的发展趋势，文章对Web与SNMP的集成进行了研究，给出了集成的嵌入式管理系统分 模型，并结合目前国际上流行的嵌入式系统开发工具，详细探讨了两种管理方式的综合设计。     

一种远程智能电源管理系统服务平台的设计与实现

针对机房海量服务器设备管理问题,提出了一种“远程网络电源管理系统平台”方案.平台由前端电源管理单元、服务平台和客户端构成.服务平台通过底层服务软件收集前端电源管理单元状态信息,传递用户控制命令.平台上层采用Web服务器和数据库系统,接收用户管理访问.为了便于管理、降低成本,客户端采用通用Web浏览器实现,用户通过Web浏览器即可远程控制服务器,随时随地监控机房,还能通过串口远程配置数据,实现真正的无人值守机房.     

The implementation of a secure and pervasive multimodal Web system architecture

While most users currently access Web applications from Web browser interfaces, pervasive computing is emerging and offering new ways of accessing Internet applications from any device at any location, by utilizing various modes of interfaces to interact with their end users. The PC and its back-end servers remain important in a pervasive system, and the technology could involve new ways of interfacing with a PC and/or various types of gateways to back-end servers. In this research, cellular phone was used as the pervasive device for accessing an Internet application prototype, a multimodal Web system (MWS), through voice user interface technology.This paper describes how MWS was developed to provide a secure interactive voice channel using an Apache Web server, a voice server, and Java technology. Securing multimodal applications proves more challenging than securing traditional Internet applications. Various standards have been developed within a context of Java 2 Micro Edition (J2ME) platform to secure multimodal and wireless applications. In addition to covering these standards and their applicability to the MWS system implementation, this paper also shows that multimodal user-interface page can be generated by using XSLT stylesheet which transforms XML documents into various formats including XHTML, WML, and VoiceXML.     

Web技术在网络管理中的应用研究

Internet技术的发展和普及,为实现网络管理的灵活性、廉价性和方便性提供了极大的机遇。文章描述了结合Internet Web技术的网络系统管理的特点和基本模型,并结合一个实用电子邮政系统的网络系统管理探讨了基于Web的网络管理的应用。     

Internet-Based Robotic System Using CORBA as Communication Architecture

In this paper, we propose the Internet-based robotic system that uses Common Object Request Broker Architecture (CORBA) to implement networking connections between a client and a remote robotic system. The client can transparently invoke a method on a server across the network without any need to know where the application servers are located, or what programming language and operating system are used. This lets the system overcome the shortcomings of the other typical Internet robotic system. To cope with time delays on the communication path, we have implemented the robot control server, which allows the user to control the telerobotic system at a task-level. We have also implemented the live image feedback server, which provides live image feedback for a remote user. The proposed system gives the users the ability to operate the remote robotic system to retrieve and manipulate the desired tableware or other things to support the aged and disabled over the Internet by using the intuitive user interface.     

基于WEB的目录服务管理系统的设计

目录服务已经成为Internet上的一种重要的服务，目录管理系统是目录服务的核心部分。但是现在通用的目录服务管理系统都不是基于WEB的，当利用LDAP目录服务为人们提供个性化服务的时候，提供一个基于WEB的管理接口是非常必要的。文中阐述了基于WEB的LDAP目录服务管理系统的设计思想和实现方法，通过使用标准的协议和常用的Internet技术的软件来构建系统，系统提供了一种通过一个统一的接口来管理多个LDAP服务器和目录项的机制。同时，笔者的设计和实现也考虑了系统中相关的安全问题。     

Using bundles for Web content delivery

The protocols used by the majority of Web transactions are HTTP/1.0 and HTTP/1.1. HTTP/1.0 is typically used with multiple concurrent connections between client and server during the process of Web page retrieval. This approach is inefficient because of the overhead of setting up and tearing down many TCP connections and because of the load imposed on servers and routers. HTTP/1.1 attempts to solve these problems through the use of persistent connections and pipelined requests, but there is inconsistent support for persistent connections, particularly with pipelining, from Web servers, user agents, and intermediaries. In addition, the use of persistent connections in HTTP/1.1 creates the problem of non-deterministic connection duration. Web browsers continue to open multiple concurrent TCP connections to the same server. This paper examines the idea of packaging the set of objects embedded on a Web page into a single bundle object for retrieval by clients. Based on measurements from popular Web sites and an implementation of the bundle mechanism, we show that if embedded objects on a Web page are delivered to clients as a single bundle, the response time experienced by clients is better than that provided by currently deployed mechanisms. Our results indicate that the use of bundles provides shorter overall download times and reduced average object delays as compared to HTTP/1.0 and HTTP/1.1. This approach also reduces the load on the network and servers. Implementation of the mechanism requires no changes to the HTTP protocol.     

Efficient multi-server authentication scheme based on one-way hash function without verification table

Following advances in network technologies, an increasing number of systems have been provided to help network users via the Internet. In order to authenticate the remote users, password-based security mechanisms have been widely used. They are easily implemented, but these mechanisms must store a verification table in the server. If an attacker steals the verification table from the server, the attacker may masquerade as a legal user. To solve the verification table stolen problem, numerous single server authentication schemes without verification tables have been proposed. These single authentication schemes suffer from a shortcoming. If a remote user wishes to use numerous network services, they must register their identity and password in these servers. In response to this problem, numerous related studies recently have been proposed. These authentication schemes enable remote users to obtain service from multiple servers without separately registering with each server. This study proposes an alternative multi-server authentication scheme using smart cards. The proposed scheme is based on the nonce, uses one-way hash function, and does not need to store any verification table in the server and registration center. The proposed scheme can withstand seven well known network security attacks.     

基于互联网服务器的海量ZigBee节点管理系统

为解决海量ZigBee节点的组网与集中管理问题，文章提出一种基于互联网服务器的多ZigBee网络结构管理设计方案.系统将海量节点拆分为多个ZigBee网络结构，各个网络之间的设计不存在耦合，可摆脱无线传输的距离限制.每个独立的ZigBee网络中除终端节点与ZigBee协调器外，新增一个可接入互联网的控制器来组成内网结构.内网中的ZigBee节点利用Z-Stack协议栈实现自组网功能，控制器主要用于实现节点与服务器之间的通讯.文章提出中央服务器的概念作为外网结构的核心，用于维护中央数据库内所有节点的状态信息，同时对客户端提供Web服务.客户端对于系统内任意节点的查询或控制操作均由中央服务器代理完成.经测试表明系统运行可靠，扩展性强，具有一定参考价值.     

Enterprise Network Traffic Monitoring, Analysis, and Reporting Using Web Technology

Today's enterprise networks are composed of multiple types of interconnected networks. Furthermore, organizations use a variety of systems and applications on these networks. Operations and management staff must provide an efficient, reliable and secure operating environment to support an organization's daily activities. Enterprise networks must be monitored for performance, configuration, security, accounting and fault management. Current management practices typically involve the use of complex, hard-to-learn and hard-to-use tools. What is needed desperately is a set of simple, uniform, ubiquitous tools for managing networks. Web-based management promises to provide such solutions. This paper focuses on the use of Web technology and the Multi-Router Traffic Grapher (MRTG) for the purposes of enterprise network traffic monitoring and reporting. In this paper, we first examine the requirements for enterprise network traffic monitoring, analysis and reporting, and then present the design and implementation of a Web-based network traffic monitoring and reporting system that satisfies those requirements. We also present guidelines we have formulated and used for analyzing enterprise network traffic. We then discuss our experiences in using such a system for traffic monitoring on two large enterprise networks.     

面向因特网应用的容错和负载平衡管理

针对因特网应用的三层客户／服务器体系结构,本文设计并实现了一个面向冗余服务的管理系统ＯＭ。它采用分布对象技术,基于ＣＯＲＢＡ平台,为冗余服务提供了容错和负载平衡管理服务,同时它还为系统管理员提供了管理接口,为用户提供了对服务的透明访问机制。     

Optimal server allocations for streaming multimedia applications on the Internet

In this paper, we address the server selection problem for streaming applications on the Internet. The architecture we consider is similar to the content distribution networks consisting of geographically dispersed servers and user populations over an interconnected set of metropolitan areas. Server selection issues for Web-based applications in such an environment have been widely addressed; the selection is mostly based on proximity measured using packet delay. Such a greedy or heuristic approach to server selection will not address the capacity planning problem evident in multimedia applications. For such applications, admission control becomes an essential part of their design to maintain Quality of Service (QoS). Our objective in providing a solution to the server selection problem is threefold: first, to direct clients to the nearest server; second, to provide multiple sources to diffuse network load; third, to match server capacity to user demand so that optimal blocking performance can be expected. We accomplish all three objectives by using a special type of Linear Programming (LP) formulation called the Transportation Problem (TP). The objective function in the TP is to minimize the cost of serving a video request from user population x using server y as measured by network distance. The optimal allocation between servers and user populations from TP results in server clusters, the aggregated capacity of each cluster designed to meet the demands of its designated user population. Within a server cluster, we propose streaming protocols for request handling that will result in a balanced load. We implement threshold-based admission control in individual servers within a cluster to enforce the fair share of the server resource to its designated user population. The blocking performance is used as a trigger to find new optimal allocations when blocking rates become unacceptable due to change in user demands. We substantiate the analytical model with an extensive simulation for analyzing the performance of the proposed clustered architecture and the protocols. The simulation results show significant difference in overall blocking performance between optimal and suboptimal allocations in as much as 15% at moderate to high workloads. We also show that the proposed cluster protocols result in lower packet loss and latencies by forcing path diversity from multiple sources for request delivery.     

DAN网络WBDM管理模型的研究

针对设备域网络DAN(Device Area Network)的网络管理，提出了一个WBDM(Web-based Device Management)管理模型，解决了家庭、企业设备环境中传统管理模型中存在的专用性、复杂性、人机界面和Web化等问题，为系统管理员在任何时间和任何地点提供了友好的、平台无关的、易于使用的远程监控嵌入式设备的方法。     

ReDAL: An Efficient and Practical Request Distribution Technique for Application Server Clusters

Modern Web-based application infrastructures are based on clustered multitiered architectures, where request distribution occurs in two sequential stages: over a cluster of Web servers and over a cluster of application servers. Much work has focused on strategies for distributing requests across a Web server cluster in order to improve the overall throughput across the cluster. The strategies applied at the application layer are the same as those at the Web server layer because it is assumed that they transfer directly. In this paper, we argue that the problem of distributing requests across an application server cluster is fundamentally different from the Web server request distribution problem due to core differences in request processing in Web and application servers. We devise an approach for distributing requests across a cluster of application servers such that the overall system throughput is enhanced, and load across the application servers is balanced.