在改进

The objectives of this research are: through horizontal analytic comparison, to find out the best practices of all countries national library Web OPAC system, to improve China national library Web OPAC system and to better utilize library resource and better serve Chinese readers.

本文研究的目的在于：在横向比较分析的基础上，找出各国国家图书馆在Web OPAC建设方面比较成功的做法，改进我国国家图书馆Web OPAC的不足，从而更好地开展文献资源利用和读者服务。

It was also the age of the Islamic Renaissance and the Arabs generally improved upon the arts and sciences that they imbibed from the land they overran during their great Jehad .

也是在这个时候，是伊斯兰复兴运动，阿拉伯人在他们伟大的圣战中从这些被征服的土地上吸收知识来对他们的艺术和科学加以改进。

Improvement is made in certain parts of the Unit 6 raft foundation, which actualizes the mass concrete construction in the area of China nuclear power station.

已完成的5台机组核岛土建筏基施工工艺均按施工图施工，在第6台机组筏基局部进行了改进并实施，在核电领域实现了大体积混凝土施工。

Collating is very important in data processing and it takes much time in batched data processing.The paper introduces an improved selection collating algorithm,which extremely reduces number of comparision times comparing with the usual selection collating algorithm and saves more than 40% of CPU time.

排序在数据处理中起着极其重要的作用，而排序在成批数据处理中占了相当的计算机时间，介绍的一种改进的选择排序算法，与通常的简单选择排序算法相比，大大地减少了比较次数，平均节省了40％的CPU时间。

On the PC of the Windows Operation system, the system of 3D reconstruction has been designed by Visual C++ programming language. It includes 3D data import, display of the original and pre-process CT images, acquirement of the data showed vividly on the screen by the improved algorithms about MC and Ray Casting and mutual observation through magnification or demagnification and circumvolving.

论文以此为基础，在PC 上，基于Windows 操作系统，利用Visual C++开发工具，运用计算机图形学和图像处理技术，实现了三维体数据的输入；二维CT 图像数据的显示和预处理；通过阈值对CT 数据进行了分割；运用改进后的算法分别对分割后的数据进行了面绘制和体绘制；对绘制后的数据在屏幕上形象逼真地进行了显示；对显示的数据进行交互式的观察，如旋转、放大、缩小。

At last, we provide the performance of the Arithmetic, and the works to be complemented are given.

最后，给出该协议在使用了加密算法后，在安全性方面的性能，以及整个系统需要完善和改进的工作。

This paper proposes an Improved Particle Swarm Optimization algorithm.IPSO adopts a new mutation operator and a new method that congregates some neighboring individuals to form multiple sub-populations in order to lead particles to explore new search space.Additionally,this algorithm incorporates a mechanism with a simple and easy penalty function to handle constraint.Thus,this algorithm has strong global exploratory capability and efficiency while being applied to solve nonlinear constrained optimization problems.

提出了一种改进的粒子群算法（Improved Particle Swarm Optimization，IPSO），使用了一种新型的变异策略，并在搜索过程中将部分邻近的个体聚集成核，从而形成多子群引导粒子探测新的搜索区域，采用了简单易行的罚函数约束处理机制，使算法在求解较难的非线性约束优化问题时具有很强的全局搜索能力与效率。

the study aims at the actual network status of one work section in daqing oil field,makes a network analysis and planning for the new mixed model of this work section,expends wireless network for the work section on the basis of existing network,and conjoins wire and wireless network together to form an integrated oil field information transfer system.at the same time,using opnet modeler simulation flat roof to structure simulation models (network models,node models and a process model),and analyzing the functions and work mechanism of the major modules for related models,making a simulation for the structured network models,then according to the different parameters,analyzing the individual statistics comparatively such as delay,data dropped and so on,the effects of data packet,data rate and fragmentation threshold to the network performance are gained.after all these,the best structure network scheme for this improved section is determined.

摘 要：此项研究主要针对大庆油田某作业区的实际网络现状，对该作业区进行网络分析和规划，在该作业区现有的有线网络基础上扩充无线网络，实现有线网与无线网的综合，构成一个完整的油田传输信息体系。同时利用opnet modeler仿真平台为该作业区新建混合网络建立仿真模型(网络模型、节点模型和进程模型)，分析相关模型中主要模块的作用和工作机理，对已建立的网络模型进行仿真，在不同的参数设置下，通过对比分析时间延迟、丢包率等统计特性，得出数据包分组、数据率和拆分门限对网络性能的影响，最终决定改进网络的最佳组网方案。

Put forward improvement DF algorithm and TD-IDF algorithm, the time that used DF algorithm to have linear on one hand is complex degree, suit the characteristic that large-scale text handles quite, adopt the method that adds a keyword appropriately, the insufficient; that made up for its to filter to mistake of individual and useful information on the other hand, use a feature the weight that chooses level in the feature undertakes adding counterpoising handling to TD-IDF method, the dimensions of documentation collect expanded below the circumstance that does not increase expenditure, still raised likeness to spend calculative accuracy.

提出改进的DF算法和TD-IDF算法，一方面利用了DF算法具有线性的时间复杂度，比较适合大规模文本处理的特征，并通过适当增加关键词的方法，弥补了其对个别有用信息错误过滤的不足；另一方面，利用特征项在特征选择阶段的权重对TD-IDF方法进行加权处理，在不增加开销的情况下扩大了文档集的规模，还提高了相似度计算的精确度。

The model has the following features: 1 The security information provided by the assessment result is more dependable because of the consideration of some main uncertain factors; 2 The improved analytic method of power system DSR and the dynamic equivalent technologies are applied to reduce the computing time and to make the model more practical; 3 Step-up assessment strategy is adopted in order to balance the precision and computing time requirements; 4 Decompounding of system insecurity indexes to each system component, or to each generator and consumer, and the visualization of assessment results, will help the operators to understand the security status of the power system more clearly; 5 The assessment results can be beneficial to the preventive control in traditional power systems and the security pricing in power market environments.

模型具有如下特点： 1由于综合考虑了一些不确定因素对系统安全性的影响，使得评估结果更加可靠； 2采用求解电力系统动态安全域的改进解析法，结合动态降维技术，大大减少了动态安全域的计算时间，使得模型比较实用； 3采取逐步递进的评估策略，以适应计算精度和计算时间要求； 4可定量分解出各元件或各发电与用户对系统不安全的贡献，配以形象直观的评估结果显示，使操作人员清楚了解系统的安全状况； 5评估结果在传统电力系统可帮助制定预防控制措施，在电力市场可用于安全性定价。

And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.

同时，论述了一体化管理体系构建中的几个主要问题，包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。

Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.

运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。