利用桥路由实现同网段多链路平衡传输的研究

对于公网IP缺口较大的办公区和居民楼新建了三层拓扑结构的局域网用以扩充用户IP,因中心路由器WAN口拥堵严重,遂对WAN口进行了扩展,由于无法对该路由器不同的以太网接口配置同一网段的公网IP,根据中心路由器可以在不同网段进行路由自动切换的原理,设置了桥路由器,变换出不同的网段,从而实现了在同一网段中进行多链路平衡传输的功能,进而克服了交换中心访问Internet的拥堵问题,实现了带宽资源的高效利用。     

动态访问控制列表在企业网中的实现

动态访问控制列表可以根据用户认证过程来创建特定的、临时的访问控制列表,是对传统访问控制列表的一种功能增强,能提供更好的安全性。基于一个企业网络,设计模拟拓扑图,给出路由器、服务器等的接口设置、IP地址分配以及配置命令,对使用动态访问控制列表前后的结果进行测试和对比分析,并在实际的网络设备上进行了实验验证。     

基于Cisco路由器配置阻止DDoS攻击

分析了分布式拒绝服务（Distributed Denial of Service,DDos）攻击原理及其攻击特征。从实际应用的角度提出了几种详细可行的DDoS攻击防范策略。     

ISDN路由器在小型企业网中的应用

介绍了一种利用ISDN路由器组建小型企业网的方法，并对其中的防火墙技术、地址转换技术、数据流量控制技术作一较详细的分析，具有较强的通用性。     

Milling of wood and wood-based materials with a computerized numerically controlled router IV: development of automatic measurement system for cutting edge profile of throw-away type straight bit

In industrial machining of timber, the method in which the operator visually inspects both wear and chippings of router bits after stopping the machine is generally adopted. However, many working hours are lost in this method and productivity suffers. Therefore, the development of a system that can automatically measure wear or chippings without stopping the machine is desirable. In this study, a laser measuring instrument was installed in a computerized numerically controlled (CNC) router, and an automatic measurement system for the cutting edge profile of throw-away-type straight bits with single-edged blades was developed. The main results are summarized as follows: (1) an automatic measurement system for the cutting edge profile of the bit was constructed; (2) this system was composed of a laser measuring instrument, a control personal computer (PC) for the CNC router, and a monitoring PC to control some devices and collect sampling data; (3) the system could measure the cutting edge profile of the bit without stopping the CNC router.Part of this article was presented at the 51st and 52nd Annual Meetings of the Japan Wood Research Society, Tokyo and Gifu, April 2001 and 2002, respectively     

基于中心结点的无线传感器网络

无线传感器网络同其他的无线自组织网络应用相比,结点移动性不强,它更多的是利用了无线自组织网络的自组织性、多跳特性。笔者为此提出了基于中心结点的无线自组织网络组网协议,它的网络构建及网结拓扑结构的改变由中心结点完成,网络中的其它各个结点只要求具有通信转发功能。能降低路由协议的设计难度,并降低对结点的硬件要求,可以大大降低结点的设计难度及其成本。     

路由器组网与网络绑定协议

一个办公室或者一个小型场所,可以由一个路由器来组建一个小型网络。路由器组建网络可以由因特网服务供应商提供的一条进户线,作为路由器的WAN或者LAN的进户线,组建路由器网络的小型场所的小型网络。网络连接由拨号软件以厦软件绑定网络通讯协议所组成,不同的网络类型绑定不同的网络通讯协议。     

基于可靠组播的实时性信息流传输控制算法

主要讨论实时信息流在可靠组播传输中的控制问题。针对这种信息流对可靠性要求相对较低，但对端到端传输延迟和网络抖动的要求很高，特引入适应这一要求的功能路由器(Power Router)。功能路由器的主要功能是对反馈信息进行汇聚、数据包丢弃的局部恢复，以及当网络拥塞时，选择性的进行丢包。分析结果表明，这种功能路由器的引入使得传输的时延和抖动性有所提高，而且对于网络的拥塞有一定的自动适应能力。     

Milling of wood and wood-based materials with a computerized numerically controlled router V: development of adaptive control grooving system corresponding to progression of tool wear

A laser measuring instrument was installed in a computerized numerically controlled (CNC) router, and an automatic measurement system, which was developed in a previous study, was used to automatically measure the cutting edge profile of throw-away type straight bits without stopping the CNC router. In addition to the above-mentioned system, in this study, an adaptive control program based on experimental data was installed, and an adaptive control grooving system that improved machining accuracy and controlled the burr formation corresponding to the progression of tool wear under processing was developed. Verification experiments of this system were carried out. The main results obtained are summarized as follows: (1) the between-process method was adopted for this system, and three types of processing methods (type 1, 2, 3), which consisted of a combination of an up-milling surface and a down-milling surface after processing, were investigated; (2) from the results of verification experiments, type 2 and type 3 methods showed remarkable ability to improve the machining accuracy and control the burr formation; and (3) it was found that the system employing adaptive control processing corresponding to the progression of tool wear in grooving is very effective. Part of this article was presented at the 52nd Annual Meeting of the Japan Wood Research Society, Gifu, April 2002     

木工数控雕刻机的探讨

木工数控雕刻机是２０世纪８０年代兴起的木工机床。本文扼要介绍了此类机床对木制品系列化、多样化所起的作用。同时指出这种机床需在电脑、机床、加工工艺等综合措施方面进一步改进，使木工数控雕刻机更为完善。