50MW补偿脉冲发电机的设计与优化

为深化补偿脉冲发电机有关机理、工艺和外围系统配合的研究,研制了一台额定转速为8000r/min的50MW全被动补偿脉冲发电机,并介绍了其中关键材料包括屏蔽筒和转轴等的选择。在理论计算和仿真分析的基础上设计了电机励磁回路以及电枢绕组,提出了一种新的电枢绕组端部屏蔽方法即采用内外两个铝环紧固绕组端部,在实现端部屏蔽的基础上还增加了端部强度,在比较了两种不同屏蔽措施的基础上提出了端部漏感的简化计算方式,并通过理论分析和仿真验证了端部屏蔽可以进一步减小电枢绕组的放电电感。最后通过分别计算补偿电机直线部分的电感和端部漏感,比较了不同设计参数下补偿电机内电感,对电枢绕组进行了优化设计,提高了补偿电机峰值功率密度。理论分析和仿真证明了所设计电机的参数及其运行可靠性可以达到设计要求。     

基于可调分组的认证加密实现方案

针对认证加密算法在实际应用中难以生成选择明文攻击的不可区分性问题,结合硬件算法平台,应用数据包标志序号、动态可调密钥计数器等提出一种改进的可调认证加密方案.通过增加小规模硬件部件换取可调因子与加密的并行计算,支持受资源限制嵌入式设备应用,可实现算法在网络中的平稳运行.实验结果表明,该方案通过并行计算可缩短系统的运行时间...     

电荷颗粒聚结技术在汽轮机润滑系统油泥清除上的应用

针对华能沾化热电有限公司(以下简称沾化热电)150 MW机组汽轮机润滑系统油泥污染严重,人工清洗费时费力且不能彻底清理的问题,采用国际领先的电荷颗粒聚结技术(Charge Particle Agglomeration,简称CPA)对汽轮机润滑系统进行在线清洗,最终使油泥倾向指数降到12,达到了国际上判定汽轮机油油泥倾向等级状态良好(<15)的标准。     

Dynamic inhomogeneous S-Boxes design for efficient AES masking mechanisms

It is an important challenge to implement a lowcost power analysis immune advanced encryption standard （AES） circuit. The previous study proves that substitution boxes （S-Boxes） in AES are prone to being attacked, and hard to mask for its non-linear characteristic. Besides, large amounts of circuit resources in chips and power consumption are spent in protecting S-Boxes against power analysis. Thus, a novel power analysis immune scheme is proposed, which divides the data-path of AES into two parts： inhomogeneous S-Boxes instead of fixed S-Boxes are selected randomly to disturb power and logic delay in the non-linear module; at the same time, the general masking strategy is applied in the linear part of AES. This improved AES circuit was synthesized with united microelectronics corporation （UMC） 0.25 μm 1.8 V complementary metal-oxide-semiconductor （CMOS） standard cell library, and correlation power analysis experiments were executed. The results demonstrate that this secure AES implementation has very low hardware cost and can enhance the AES security effectually against power analysis.     

Report of CPA Representative Social Science Research Council of Canada.

Presents the report of the Canadian Psychological Association Representative to the Social Science Research Council of Canada. The Annual Meeting of the Social Science Research Council of Canada met at Carleton University on 13 June 1967. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Rapport Du Representant De La SCP Au Conseil National De La Planification Scientifique De L'association Canadienne D'Hygiene Mentale.

Presents the report of the Canadian Psychological Association representative to the National Scientific Planning Council of the Canadian Mental Health Association. The purpose of this report is to communicate in very brief form the activities of the Council which are most likely to be of interest to psychologists. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

注册会计师制度的问题与对策

对注册会计师制度的现状作了分析，提出了存在的问题，结合国外的先进经验，对解决这些问题提出了自己的意见．     

提高定制产品物料需求预测的准确性

提高定制产品物料需求预测准确性是提高企业竞争能力的必由之路。通过某公司提高定制产品物料需求预测准确性的具体项目实践，介绍了关于提高物料需求预测准确性的具体措施。通过建立一种能为各部门所共同接受的产品语言来加强各部门的信息交流，并减少从客户的实际需求到物料预测之间的中间环节来提高整个物料预测的准确性，并以实例验证其有效性。     

基于数据加密标准掩码的功耗分析方法

针对典型数据加密标准( DES)掩码实现的安全性问题,提出一种对其进行密钥破解的相关性功耗分析方法。结合DES运算后两轮,选择密码运算过程中间值中的分散位作为目标函数,利用汉明重量模型猜测第16轮运算的轮密钥,并计算功耗和中间值数据的汉明重量之间的相关性,根据相关性大小进行排序,从而破解掩码DES算法的密钥。实验结果表明,该方法取得了较好的效果,可成功破解掩码型DES算法的64位密钥。     

A hybrid fuzzy MCDM approach for evaluating website quality of professional accounting firms

Due to the popularity of internet, the CPAs can develop websites that properly deliver professional information and represent their firms. Effective use of CPA firm websites can increase communication with existing clients and attract potential clients. This study aims to build a hybrid approach that combines the fuzzy analytic network process (FANP) and fuzzy VlseKriterijumska Optimizacija I Kompromisno Resenje (FVIKOR) for evaluating website quality of the top-four CPA firms in Taiwan and provide worthwhile recommendations for enhancing website design and content. The results show that CPA firms included in this study do not utilize the Internet to its full potential and need to improve their websites. Deloitte has the best overall performance, follow by PricewaterhouseCoopers, Ernst & Young, and KPMG. Additionally, the top-five evaluation criteria in order of importance are richness, understandability, assurance, relevance, and reliability. Therefore, the findings of this study can help CPAs identify the strengths and weaknesses of their own websites and in comparison with those of their competitors, and then make resource allocation decisions about how to improve the status quo and achieve ideal websites.