Ruin probabilities with pairwise quasi-asymptotically independent and dominatedly-varying tailed claims

This paper considers the nonstandard renewal risk model in which a part of surplus is invested into a Black-Scholes market whose price process is modelled by a geometric Brownian motion, claim sizes form a sequence of not necessarily identically distributed and pairwise quasi-asymptotically independent random variables with dominatedly-varying tails.The authors obtain a weakly asymptotic formula for the finite-time and infinite-time ruin probabilities.In particular,if the claims are identically distributed and consistently-varying tailed,then an asymptotic formula is presented.     

A two-stage estimation algorithm for a type of current status data

Success-failure life tests are widely used in reliability engineering research to evaluate the storage life of products,where the observed data are the current status data,usually summarized as the form of "binomial life data".For this type of data,this paper proposes a two-stage algorithm to estimate some commonly used lifetime distributions.This algorithm is automatic,intuitively appealing and simple to implement.Simulation studies show that compared with some existing methods,the proposed algorithm is more stable and efficient,especially in small sample situations,and it can also be extended to deal with some complicated lifetime distributions.     

采用分块编码的小波图像压缩技术

研究了基于小波变换的图像压缩技术。在小波分解的基础上,结合人眼视觉系统（ＨＶＳ）特性,提出了一种分块编码的图像编码算法。该算法利用小波变换系数子带内和子带间的相关性以及小波系数的分布特点,有效地对高频子带数据进行了压缩。该方法实现简单,可达到很好的压缩效果。     

Study on the REM Model for Group Decision Making

IntroductionAsocialchoicefunctionisamappingwhichassignsanonemptysubsetofthepotentialfeasiblesubsettoeachorderedpairconsistentofapotentialfeasiblesubsetofalternativesandascheduleorprofileofvoters'preferences.Consideranopinionaggregationprobleminwhichagroupofexpertsgivetheirscoresthatexpresstheirpreferencestoasetofalternativesanddesiretocombinetheirscoresintoasingleaggregationpreferenceoverthealternativeset.Theunderlyingideahereisthattheconsensusofnumerousexpertsresultsinasuperiorpreferenceonthe…     

航天系统安全性分析的概率风险评估方法

在对航天系统进行安全性分析的定性、定量、综合方法的基础上,主要介绍了以定量风险评估为主的、在ＮＡＳＡ和ＥＳＡ均得到广泛应用的概率风险评估（ＰｒｏｂａｂｉｌｉｓｔｉｃＲｉｓｋＡｓｓｅｓｓｍｅｎｔ,ＰＲＡ）方法．着重介绍了该方法的基本思想和具体实施过程,并探讨了在我国航天系统安全性分析中使用ＰＲＡ方法的可行性。     

二维发汗控制方程的直线解法及其收敛性

对二维发汗控制方程建立了直线解法,可用任何解常微分方程组的数值方法求解。对固定边界（非烧蚀）和活动边界（烧蚀）情形分别进行讨论。在某些假定下给出了直线法的收敛性。     

松嫩平原海伦农区种植业与草食动物兼营规模及效益分析

根据松嫩平原农区特点,运用经济分析的方法,对国家农业攻关和重大项目海伦试验基地基点村－胜利村的种植业怀草食动物兼营户的经济效益、规模进行评估分析。在目前生产力水平下,松嫩平原农区兼户的经济效益普遍高于单一种植业户,其生产规模：种植业２ｈｍ＾２－４ｈｍ＾２养牛４－６头 。     

计算机网络在农业科研中的建设和应用

计算机网络在当的信息时代发挥着越来越重要的作用。中国科学院黑龙江农业现代化研究所自１９９６年作为中国科技网（ＣＳＴＮＥＴ）的一个节点建设网络以来,在农业科研、办公管理自动化等方面取得了一定成效,不断地显示网络的快捷,准确和资源共享的强大功能、现就该局域网的建设及应用作一探讨。     

有联系数描述和处理网络计划中的不确定性

通过对集对分析（ＳＰＡ）中的联系数引入到网络计划技术之中,为工程中因各种情况变化引起民的工期不稳定性提供了一种新的表达和处理方法,研究表明,这种基于联系数的网络计划与调控方法提供了更多有价值的信息,如着急路线、次关键路线和再次关键路线及其转化关系等,具有更灵活的表达和处理能力且符合工程实际新方法思路清晰、操作方便,是一种值得推广的新型网络计划方法。     

Application of improved equivalent edge currents in synthetic aperture radar imaging

Target modeling and scattering function calculating are important prerequisites and groundwork for the synthetic aperture radar (SAR) imaging simulation. According to the difficult problems that normal methods cannot calculate the scattering function of electrically large object under the condition to wideband, an effective method of improved equivalent edge currents is presented and applied to SAR imaging simulation for the first time. This method improves calculating velocity and has relatively high precision. The concrete steps of applying the method are given. By way of the simulation experiment, the effectiveness of the method is verified.