Adaptive random search for continuous simulation optimization

We present, analyze, and compare three random search methods for solving stochastic optimization problems with uncountable feasible regions. Our adaptive search with resampling (ASR) approach is a framework for designing provably convergent algorithms that are adaptive and may consequently involve local search. The deterministic and stochastic shrinking ball (DSB and SSB) approaches are also convergent, but they are based on pure random search with the only difference being the estimator of the optimal solution [the DSB method was originally proposed and analyzed by Baumert and Smith]. The three methods use different techniques to reduce the effects of noise in the estimated objective function values. Our ASR method achieves this goal through resampling of already sampled points, whereas the DSB and SSB approaches address it by averaging observations in balls that shrink with time. We present conditions under which the three methods are convergent, both in probability and almost surely, and provide a limited computational study aimed at comparing the methods. Although further investigation is needed, our numerical results suggest that the ASR approach is promising, especially for difficult problems where the probability of identifying good solutions using pure random search is small. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

关于翻译的归化还是异化问题的探讨

翻译是促进人类交流,传递文化信息的最有效的途径。采取何种翻译方法才能使翻译的文本达到最佳效果,是人们长时间讨论的问题。本文拟对西方的翻译观点和中国传统的翻译观点进行概述,以使人们对于翻译问题有更好地认识。     

Statistical analysis of exponential lifetimes under an adaptive Type‐II progressive censoring scheme

In this article, a mixture of Type‐I censoring and Type‐II progressive censoring schemes, called an adaptive Type‐II progressive censoring scheme, is introduced for life testing or reliability experiments. For this censoring scheme, the effective sample size m is fixed in advance, and the progressive censoring scheme is provided but the number of items progressively removed from the experiment upon failure may change during the experiment. If the experimental time exceeds a prefixed time T but the number of observed failures does not reach m, we terminate the experiment as soon as possible by adjusting the number of items progressively removed from the experiment upon failure. Computational formulae for the expected total test time are provided. Point and interval estimation of the failure rate for exponentially distributed failure times are discussed for this censoring scheme. The various methods are compared using Monte Carlo simulation. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009     

论俄语副动词汉译教学中的三要素

俄语副动词由动词变化而来,形式特殊,兼有动词和副词的特点及功能,在俄汉翻译教学中,需注意时间关系、逻辑关系、汉语表达习惯三要素。本文结合俄汉翻译实例分析这三要素,以期为俄语副动词汉译的深入探讨奠定基础,为俄语副动词汉译的教学提供借鉴。     

油库地面油罐消防虚拟现实系统的研究

主要研究地面油罐消防场景可视化在微机上的实现。介绍了虚拟现实系统开发平台的选择;研究了虚拟现实系统中高级建模技术:通过编程实现3DS三维模型在OpenGL中的调用;利用Biuboard技术增强了图形的真实感;运用粒子系统建模技术,实现了场景中火焰、烟、消防水束的绘制。最后,给出了捕捉的不同角度的两帧灭火场景效果图。     

突发重大疫情风险管理支撑方法研究【专题】

突发重大疫情后,科学的风险管理方法可为有效规避和控制风险提供有力支撑。在突发重大疫情风险管理中,风险识别是基础,风险评估是核心,风险控制是目的。本文系统梳理与分析了风险管理中的常用方法,包括风险识别中的现场勘查法、事故树分析法、过程回溯法、专家认证法和案例分析法等5种方法,风险评估中的风险坐标图法、关键风险指标法、蒙特卡罗法、因果关系法和综合评价法等5种方法,以及风险控制决策中的成本收益决策法、决策树法和损失期望值决策法等3种方法,并对每种方法如何在此次由新型冠状病毒引发的突发重大疫情中实践应用进行了举例说明,可为今后在应对突发重大疫情时进行科学风险识别、有效风险评估和精准风险控制决策提供借鉴与参考。     

计算机课程双语教学实践探讨

计算机双语教学是有效提高学生计算机水平和英语应用能力的一种教学方式,在教学实践中体会计算机学科开展双语教学的优越性,掌握实施方案和管理方法,改变计算机双语教学的授课方式。     

武警院校后勤教学贯彻落实科学发展观之思考

贯彻落实科学发展观是当今社会发展的主题。要把科学发展观贯穿于武警院校后勤教学全过程,必须转变教学观念,创新教学思路;按照教学要求,完善教学设施,改进教学方法与手段;大胆进行教学内容改革,完善教学体系;加强教员队伍建设,奠定优质课教学基础。     

论英语拟声词及其翻译

本文分析了英汉拟声词的语音关系和英语拟声词的语音修辞功能。在保留英语拟声词语音修辞效果前提下,分别从英汉拟声词的语音关系和英汉拟声词的声音发出者所承载的不同文化意象等角度探讨了相应的翻译方法。     

保障党员民主权利与党内民主的当前使命

党员的主体地位在本质上就是党员的民主权利。党员在党内当家做主,有效行使民主权利是党内民主的本质与核心,也是党员主体地位的本质与核心。党的十七大以来,党内民主业已成为党的建设的主旋律,全面推进党的建设新的伟大工程中当前时代新课题就是要回答“发展什么样的党内民主,怎样发展党内民主”这一时代新课题。而如何实现党员的主体地位,切实保障党员的民主权力,也H益成为党内民主建设的核心。发展党内民主,切实保障党员民主权利,从主观方面来看需要重视对党员民主素质的培养与提高,从客观方面来看需要着重于制度的精细化建设,在此基础上结合党员民主权利授予与行使过程这一载体,在党内决策、执行、监督各项“权力”运行过程中,确保党员民主权利的有效行使与主体地位的充分体现。