Development of smart composite structures with small-diameter fiber Bragg grating sensors for damage detection: Quantitative evaluation of delamination length in CFRP laminates using Lamb wave sensing

The authors and Hitachi Cable, Ltd. have recently developed small-diameter optical fiber and its fiber Bragg grating (FBG) sensor for embedment inside a lamina of composite laminates without strength reduction. The outside diameters of the cladding and polyimide coating are 40 and 52 μm, respectively. First, a brief summary is presented for applications of small-diameter FBG sensors to damage monitoring in composite structures. Then, we propose a new damage detection system for quantitative evaluation of delamination length in CFRP laminates using Lamb wave sensing. In this system, a piezo-ceramic actuator generates Lamb waves in a CFRP laminate. After the waves propagate in the laminate, transmitted waves are received by an FBG sensor attached on or embedded in the laminate using a newly developed high-speed optical wavelength interrogation system. This system was applied to detect interlaminar delamination in CFRP cross-ply laminates. When the Lamb waves passed through the delamination, the amplitude decreased and a new wave mode appeared. These phenomena could be well simulated using a finite element analysis. From the changes in the amplitude ratio and the arrival time of the new mode depending on the delamination length, it was found that this system could evaluate the delamination length quantitatively. Furthermore, small-diameter FBG sensors were embedded in a double-lap type coupon specimen, and the debonding progress could be evaluated using the wavelet transform.     

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基于B/S模型的智能卡登录系统的设计与实现

本文描述了如何使用OpenCard Framework实现一个应用智能卡的登录系统，该系统基于B/S模式，可以和现有的登录系统进行无缝连接，可以平滑过渡，为用户免除记忆和输入大量用户名和密码的烦恼，增加了系统的安全性。     

Issues in the design and use of wearable computers

Wearable computers are fully functional, self-powered, self-contained computers that allow the user to access information anywhere and at any time. In this paper, design issues for wearable computers are discussed, including power considerations, use of input devices, image registration, and the use of wearable computers for the design of smart spaces. Application areas for wearable computers are presented, including medicine, manufacturing, maintenance, and as personal assistants. Finally, future research directions for wearable computers are indicated.     

几种智能传感器简介

介绍几种常用的智能传感器（变送器）。     

一种基于策略的新型主动网络管理系统

基于策略的主动网络管理(PBANM)能够解决目前PBNM技术中存在的大部分问题。基于SENCOMM设计和实现了一种基于策略的主动网络管理系统，并采用智能探针作为资源发现、网络监测、策略发布和策略执行的主要机制。     

网络流量监测服务器系统的研究

在电信企业的大型网络体系中,对网络数据流量的监测和控制已经为人们所关注。结合Flow Accounting Server(FAS)和Cabletron Traffic Accounting(CTA)管理系统,通过对LFAP协议的分析和研究,提出了对网络的流量和策略进行控制的方法,从而解决了大量的网络流 量监测任务。     

基于Schnorr签名体制的远程用户认证系统

提出了一个新的基于Schnorr签名体制和智能卡的远程用户认证系统，系统不需要使用传统的通行字表，并可防范重放攻击，能够安全而有效地工作在通信链路不安全的网络环境中。     

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