Multi-objectives exception management model for semiconductor back-end environment under turnkey service

On-time delivery is the need for customer satisfaction which is a critical factor in the survival of the semiconductor industry. The on-time-delivery performance of the whole semiconductor turnkey service depends on the performance of the back-end factories. Unfortunately, undesirable and inevitable production variations make it difficult to maintain and improve a factory's performance and more objectives such as cycle time, throughput rate and the due-date accuracy need to be simultaneously considered. This paper presents an exception management model in order to compromise the contradicting needs of delivery accuracy, throughput rate and cycle time. The exception model can be divided into three parts: (1) an integrated performance index is proposed to compromise multiple performance measures; (2) an AWDL (available WIP deviation level) determination model is designed to gather proper AWDLs for triggering exceptions and (3) a WIP correction action is proposed to make abnormal WIP levels back to normal levels as soon as possible. To evaluate the proposed WIP exception management model, a simulation model is constructed and experiments are then conducted. The simulation results show that the proposed model helps back-end factories to set proper exception triggering conditions, reduce uncertainty occurrences and achieve better performances on due dates.     

实践唯物主义的创立及现实意义

在马克思之前,柏拉图、亚里士多德、黑格尔等哲学家对社会历史活动都有自己的看法和理解,但他们都没找到历史活动的规律,对实践的认识也只是停留在或知识或是道德活动或是精神的层面。马克思创立的实践唯物主义,揭示了社会历史发展的规律,强调了实践活动在社会历史发展中的重要作用。     

化解地方政府债务的目标设计与制度选择

如何评价、界定、量化中国地方政府债务,从而适度控制和有效化解地方长期累积存压的巨额债务负担,是中国政府、学术界乃至全社会重点关注的问题,也是亟待破解的难题.以线性指标体系量化地方政府债务难以解决指标设置、基础数据、主导警源、风险测度等问题,应转化研究范式,通过对债务传导模式、层级架构、量化思路的理论阐释,从公共经济学、制度经济学、博弈论等理论视角重新解读地方政府债务的形成机理及潜在威胁,进而设计出化解债务的渐进性战略目标及配套制度安排.化解地方政府债务的战略目标设计沿循调节总量→控制增量→削减存量的动态演进路径,而制度安排是实现化解目标的外部约束条件.     

哈马斯的宗教政治特性与其斗争策略的调整

哈马斯是一个宗教与政治紧密结合的组织,其策略既受到伊斯兰教的深刻影响,又与巴以和平进程密切相关。哈马斯根据政治形势的变化适时地调整其斗争策略,特别是在大选获胜后哈马斯斗争策略的调整力度加强,在未来的中东和平进程中,哈马斯会结合其宗教理念在政治上继续调整其策略,以适应中东复杂的形势。     

Uniform asymptotics for ruin probability of a two-dimensional dependent renewal risk model

ABSTRACT

In this paper we consider the tail behavior of a two-dimensional dependent renewal risk model with two dependent classes of insurance business, in which the claim sizes are governed by a common renewal counting process, and their inter-arrival times are dependent, identically distributed. For the case that the claim size distribution belongs to the intersection of long-tailed distribution class and dominant variation class, we obtain an asymptotic formula, which holds uniformly for all time in an infinite interval. Moreover, we point out that the formula still holds uniformly for all time in an infinite interval for widely dependent random variables (r.v.s) under some conditions.     

农民进城和我国早期城市化——历史的追索与思考

文章是从农民进城的角度讨论我国早期城市化,内容包括早期城市化出现的历史前提,农民进城为城市发展带来新动力,也给城市管理带来新挑战,以及进城农民在新的生活环境下的竞争和压力.上述虽不是早期城市化的全部,但亦是其中的重要内容.     

我国贫困人口的脆弱度与贫困动态

 在贫困脆弱性和贫困动态理论的逻辑归纳与阐述基础上，利用辽宁省重点贫困县调查样本数据，采用聚类分析、脆弱度分析以及敏感度分析等方法实际测度了贫困县贫困状态的分布情况和脆弱程度；从贫困动态的角度，对贫困户1997～2006年间的贫困发生频次、深度及持续时段进行了统计分析。研究发现，各个贫困县的贫困脆弱性程度存在一定的差异，且受多重致贫因素的影响呈现出一定的类型分布特征；贫困动态的分析在一定程度上支持了贫困脆弱度的结果；贫困时段分析与以往研究发现略有不同，呈现出“暂时贫困”和“长期贫困”二者“并重”的特征，而非“单一分布”的“偏态”， 真正有效率的扶贫救济制度应当准确地锁定在持续贫困的家庭上，政策相应地要具有差异性和弹性，这样才有可能快速及时的解决攻坚阶段的贫困问题。     

A segmented regime-switching model with its application to stock market indices

This paper evaluates the ability of a Markov regime-switching log-normal (RSLN) model to capture the time-varying features of stock return and volatility. The model displays a better ability to depict a fat tail distribution as compared with using a log-normal model, which means that the RSLN model can describe observed market behavior better. Our major objective is to explore the capability of the model to capture stock market behavior over time. By analyzing the behavior of calibrated regime-switching parameters over different lengths of time intervals, the change-point concept is introduced and an algorithm is proposed for identifying the change-points in the series corresponding to the times when there are changes in parameter estimates. This algorithm for identifying change-points is tested on the Standard and Poor's 500 monthly index data from 1971 to 2008, and the Nikkei 225 monthly index data from 1984 to 2008. It is evident that the change-points we identify match the big events observed in the US stock market and the Japan stock market (e.g., the October 1987 stock market crash), and that the segmentations of stock index series, which are defined as the periods between change-points, match the observed bear–bull market phases.     

关于我国人口教育概念的重新认定

本文通过对我国人口教育发展历程的回顾 ,提出重新认定人口教育教学内容问题 ,并试图通过整合课程途径来实现这一目标     

我国丝绸出口贸易的经济分析

我国丝绸出口贸易的 "显示"比较优势指数呈逐年下降的趋势,但其数值一直保持在17以上,说明我国的丝绸出口与其他出口商品相比仍具有很大的竞争优势;我国丝绸出口的相对价格弹性系数为-0.3825,属于低弹性的商品.降低丝绸出口价格,不但无益于丝绸出口量的增加,反而会引起出口创汇额的明显下降,引起丝绸"出口贫困"现象的产生.稳定我国丝绸出口价格,是我国蚕丝业和丝绸贸易稳定发展的正确选择.