基于曙光1000A的并行查询核心系统的设计与实现

根据曙光１０００Ａ的特点，提出了查询核心系统的设计方案；经过分析比较，选定了数据划分方法，确定了ＳＱＬ子集。在此基础上，研究了物理库设计、并行事务管理、查询优化器的设计和事务的调度方法，旨在为在曙光１０００Ａ上建造并行数据库系统奠定基础。     

Chemical mechanical polishing of polymer films

Strategies to reduce capacitance effects associated with shrinking integrated circuit (IC) design rules include incorporating low resistivity metals and insulators with low dielectric values, or “low-κ” materials. Using such materials in current IC fabrication schemes necessitates the development of reliable chemical mechanical polishing (CMP) processes and process consumables tailored for them. Here we present results of CMP experiments performed on FLARE™ 2.0 using a specialized zirconium oxide (ZrO₂) polishing slurry. FLARE™ 2.0 is a poly(arylene) ether from AlliedSignal, Inc. with a nominal dielectric constant of 2.8. In addition, we provide insight into possible removal mechanisms during the CMP of organic polymers by examining the performance of numerous abrasive slurries. Although specific to a limited number of polymers, the authors suggest that the information presented in this paper is relevant to the CMP performance of many polymer dielectric materials.     

中国公用电话业务发展值得借鉴的几个案例

随着技术和需求的不断发展,电信市场逐步走向开放,竞争更加激烈。如何抓住信息技术革命的新契机,充分掌握公话的发展方向,成为电信运营商和设备供应商的首要课题。从不同国家的公话案例得到的重要启示是:①无论是发达国家还是发展中国家,归根结底都是市场需求决定了公话的发展趋势;②作为一个运营商,首先要考虑如何优化运营成本,避免重复建设,降低总投资,缩短项目周期,同时还要引进和利用世界上最先进的技术,突破传统语音电路交换网络的限制,利用多种接入方式开展业务;③从全球来看,通信业务将从传统的话音业务逐渐向数据业务发展,运营商可以利用数字通信的优势,为广大公众用户提供个性化数字信息服务     

一种MPEG2视频编码的神经网络自适应量化算法

本文在ＭＰＥＧ２ＴＭ５建议我自适应量化策略的基础上，提出了一种ＭＰＥＧ２视频编码的神经网络自适应量化算法。     

Coliphage prevalence in high school septic effluent and associated ground water

At the present time, somatic and male-specific coliphage and human enterovirus groups are being considered as indicators of possible pathogenic human enteric virus contamination from fecal contamination. A primary attribute for any indicator of fecal contamination is its prevalence at the source and in associated ground water. It must be consistently found in the source material at concentrations that are measurable with available techniques. Over a period of ten months, male-specific and somatic coliphage ranged from 7000 to 4,000,000 PFU/L in the effluent from a multi-user septic-tank. Unlike the values determined for septic-tank effluent, coliphage concentrations measured in ground water over this same period only varied by five-fold. Coliphage concentration in ground water under the down-gradient edge of the drainfield contained 1000 PFU/L. This concentration decreased at −1 log₁₀/5 m during 17.4 m of ground-water transport. From these data, coliphage concentrations in septic-tank effluent seem sufficient to allow their use as indicators of fecal contamination in ground water.     

城市加油站的防火与消防管理

介绍汽车加油站在防火设计与消防管理方面需注意的问题，主要包括站址选择、总平面布置、油罐设置、管线布置、卸油方式等方面，同时对加油站的日常操作与防火消防管理提出了要求。     

Reliability and performance analysis of time – space – time switching networks with multiple separated space switches

Since electronic switching systems usually require very strict reliability requirements as well as good performance objectives, we need to jointly analyse the performance and reliability of switching systems. In this paper, we compare conventional time–space–time switches with single space switches with those with multiple separated space switches, from the viewpoints of reliability and performance. We consider time–space–time switching networks which consist of N incoming time switches, i.e. one NxN space switch, two (N/2)x(N/2) space switches, and four (N/4)x(N/4) space switches. We introduce a Markov reliability model to study the effect of failures and analyse the reliability and performance of three different types of switching networks in terms of average blocking probability and the mean time to unreliable operation, as we vary the offered traffic. As a result, T–S–T switching networks with multiple separated space switches exhibit better performance and reliability than those with single space switches.     

基于空间矩的灰度边缘亚像元度量精度分析

灰度图像中边缘定位受采样密度限制，亚像元精度度量方法在需要高精度的应用中受到重视，要想知识到底需要多高的分辨率才能达到定精度指标，就有必要分析特征定位方法的最坏情况的精度，文中用分析和实验的方法给出了基于空间矩的边缘定位方法，对于边缘点，边缘直线以及直边缘区域的最坏情况定位精度分析。分析和讨论的结果不但可以用来确定已知形状位置估计的最大误差，而且还可用于对准的形状几何参数，以获得较高的精度。     

HAP陶瓷合成的研究

本文对生物陶瓷材料－羟基磷灰石的合成进行了研究。试验将激光合成与湿法合成对比分析，着重探讨了在激光辐照下生物陶瓷的形貌，粒度，化学组成和结构等的变化规律，对激光涂敷生物陶瓷涂层有一定的指导意义。