基于虚拟仪器功率测试分析系统

介绍基于虚拟仪器的功率测试分析系统的构成，软件设计以及数据采集、信号处理和整体结构。该系统已在实际应用中取得很好效果。     

针尖轮廓飞象扫描检测方法研究

分析了目前我国几种针尖轮廓检测方法、特点和存在问题。提出了一种针尖飞象自动检验方法，其原理是：被检测的针尖和探测器不动，利用转镜系统扫描针尖，产生针尖各部的时序象（飞象），这些依次出现的象受到探测器检测，即可获得反映针尖轮廓的一串直径信息。文中还对飞象扫描法的误差进行了分析和讨论。     

An efficient search mechanism for supporting partial filename queries in structured peer-to-peer overlay

Accompanying the growth of the Internet, computers throughout the world can connect to each other and exchange information, increasing the convenience and efficiency of information-based work. The advent of data-sharing applications, such as Napster and Gnutella, has made peer-to-peer (P2P) systems popular for widespread exchange of resources and voluminous information between millions of users. In recent years, research issues associated with P2P systems have been discussed widely. To resolve the file-availability problem and improve the workload, a method called the Distributed Hash Table (DHT) has been proposed. However, DHT-based systems in structured architectures cannot support efficient queries, such as a similarity query, range query, and partial-match query, due to the characteristics of the hash function. This study presents a novel scheme that supports filename partial-matches in structured P2P systems. The proposed approach supports complex queries and guarantees result quality. Experimental results demonstrate the effectiveness of the proposed approach.     

Dynamic mix zone: location data sanitizing in assisted environments

Pervasive technology has been widely used in assistive environments and aware homes. The issue of how to preserve the privacy of patients being monitored has been attracting more public concerns. In assistive environments, location data of patients are collected through sensors for behavior patterns analysis, and they can also be shared among researchers for further research for early disease diagnosis. However, location information, even though de-identified, also introduces the risk of privacy leakage. A series of consecutive location samples can be considered as a trajectory of a single person, and this may leak private information if obtained by malicious users. This paper discusses this problem and proposes a location randomization algorithm to protect users’ location privacy. Two privacy metrics according to location privacy are defined and used to evaluate the proposed approach. A method using dynamic mix zones is proposed to confound trajectories of two or more persons.     

Efficient Graph-Based Algorithms for Discovering and Maintaining Association Rules in Large Databases

In this paper, we study the issues of mining and maintaining association rules in a large database of customer transactions. The problem of mining association rules can be mapped into the problems of finding large itemsets which are sets of items brought together in a sufficient number of transactions. We revise a graph-based algorithm to further speed up the process of itemset generation. In addition, we extend our revised algorithm to maintain discovered association rules when incremental or decremental updates are made to the databases. Experimental results show the efficiency of our algorithms. The revised algorithm is a significant improvement over the original one on mining association rules. The algorithms for maintaining association rules are more efficient than re-running the mining algorithms for the whole updated database and outperform previously proposed algorithms that need multiple passes over the database. Received 4 August 1999 / Revised 18 March 2000 / Accepted in revised form 18 October 2000     

蔗糖脂肪酸酯的合成

本文对蔗糖脂肪酸酯的物理、化学性质及合成反应机理进行了详细地介绍，并用乙醇为原料代替有毒的甲醇与硬脂酸反应，合成硬脂酸乙酯，由硬脂酸乙酯与蔗糖在无毒溶剂丙二醇存在下进行酯交换反应，合成了硬脂酸蔗糖酯。通过大量的实验确定了合成反应的最佳工艺条件，取得了较好的效果。     

精密石英谐振式位移传感器

提出了用石英晶体谐振器构成的超精密位移或压力传感器的原理．由于石英晶体振荡器有超常的精度和稳定性，因而组成的位移或压力传感器也具有极高的精度和线性。还引入双晶振的差频原理，既消除了温度影响，又提高了频率变化范围，提高了测量分辨率。     

广州市居住环境上空悬浮颗粒物分布的信息分析研究

生活环境中微尘的污染直接影响人体的健康，搞清楚悬浮颗粒在生活环境中的分布情况对环境的治理有重要意义。文中介绍了本研究组对广州市四个观察点能见情况的观察结果。对广州市四个不同功能区包括工业区、商业区、居住区和园林区的居住环境空气的浮悬颗粒物，在不同季节、不同层高进行了采样；组建了电子显微ＣＣＤ摄像系统；用所研究的纤维物剔除图像处理软件，分析了以上居住环境的浮悬颗粒物分布情况。指出广州市居住上空的浮悬颗粒物大小的分布符合指数函数分布规律，给出了ＰＭ１０以下微尘颗粒分布的分析结果及进一步应研究的内容。     

脱硫塔内雾粒测定仪及其测试技术研究

叙述了雾粒粒径测试仪器的设计原理及为进入塔内测试的结构特点。讨论了有关的测试技术问题，特别对仪器动态测试稳定性问题进行了讨论，还对直接影响信号真实度的采样窗口设定问题进行了讨论。文中还讨论用多闪拟合逼近法对雾粒多峰分布的信号进行分析的方法。最后还介绍并讨论了脱硫塔雾场测试的结果，通过一万多小时的实际运行，证实了所测结果的正确性。     

基于LabVIEW的粉尘排放远程监控系统研究

针对大气环境监测数据反馈时间长,不利于指导生产的问题,同时为了简化数据传输的过程,基于虚拟仪器开发平台LabVIEW 8.0进行了粉尘排放远程监控系统的设计和研究.该系统使用NI公司生产的数据采集卡,利用数据采集助手DAQ Assistant对数据采集卡进行驱动,并采用DataSocket通信技术进行数据的实时、远程采集,实现了对粉尘排放的远程监控.实验证明该系统是稳定可靠的.