One-dimensional optimal bounded-shape partitions for Schur convex sum objective functions

Consider the problem of partitioning n nonnegative numbers into p parts, where part i can be assigned n_i numbers with n_i lying in a given range. The goal is to maximize a Schur convex function F whose ith argument is the sum of numbers assigned to part i. The shape of a partition is the vector consisting of the sizes of its parts, further, a shape (without referring to a particular partition) is a vector of nonnegative integers (n₁,..., n_p) which sum to n. A partition is called size-consecutive if there is a ranking of the parts which is consistent with their sizes, and all elements in a higher-ranked part exceed all elements in the lower-ranked part. We demonstrate that one can restrict attention to size-consecutive partitions with shapes that are nonmajorized, we study these shapes, bound their numbers and develop algorithms to enumerate them. Our study extends the analysis of a previous paper by Hwang and Rothblum which discussed the above problem assuming the existence of a majorizing shape. This research is partially supported by ROC National Science grant NSC 92-2115-M-009-014.     

经济发展视域下的社会稳定关联因素分析

经济发展视域下的经济增长、就业、收入差距、社会保障、弱势群体等因素与社会稳定之间存在复杂和多面的关联.这种关联的复杂性和多面性既取决于这些因素本身,也取决于和这些因素及社会稳定相关的许多其他变量.基于关联视角的社会稳定对策要注重强化经济发展中相关方面与社会稳定的正相关,弱化相关方面与社会稳定的负相关,将正相关发挥到最大限度,把负相关减弱到最低程度.     

"了"、"却"的语法化以及"了"、"却"的替换

汉语词汇很早就出现实词和虚词的区分。虚词大都是通过实词转变而来,通常是由于某个实词或因句法位置或者组合功能的变化而造成词义演变,或因词义的变化而引起句法位置、组合功能的改变,最终使之失去原来的意义。本文对"却"、"了"两个虚词的语法化作了一个较为详细的描写,并从历时的角度对其演变作出解释。     

所有制性质、制度环境与企业跨区域市场进入战略选择

转轨经济中企业所有制性质与外部制度环境差异对企业战略选择有着至关重要的作用,本文结合资源依赖理论和制度理论,探讨不同所有制性质的房地产企业在跨区域发展战略和市场进入模式选择上的差异,并进一步考察区域制度环境对这种差异的影响作用。研究表明,民营房地产企业发生跨区域经营的概率显著高于国有房地产企业;国有房地产企业倾向于选择对目标市场经营活动较高控制程度的跨区域市场进入模式,而民营房地产企业则倾向于选择对目标市场经营活动较低控制程度的跨区域市场进入模式;当房地产企业进入制度相对完善的区域时,尽管民营企业相比国有企业仍然更倾向于选择低控制市场进入模式,但是两类所有制企业的市场进入模式选择差异显著缩小。     

Risk Analysis, Systems Analysis, and Covey's Seven Habits

This article relates problem solving to the common approaches of the gestalt-holistic philosophies of systems analysis, risk analysis, and Stephen Covey's Seven Habits of Highly Effective People. Guiding principles developed on the basis of these philosophies provide the foundations for methodological frameworks that build on a plethora of theory, methods, tools, and techniques. Although systems analysis and risk analysis differ in their historical evolution and technical maturity, both study and solve problems using methodological frameworks that share a holistic vision.     

虚拟企业成功的影响因素

虚拟企业是为满足顾客需要而形成的一种新型企业组织形式。论述了虚拟企业的具体涵义及其所具有的优势,并概括出影响虚拟企业成功的9种主要因素。     

Solving the part families problem in discrete-parts manufacture by simulated annealing

In the production planning and control of discrete-parts manufacture, aggregation of parts into families, on the basis of similarity, is carried out to ease both long-horizon planning and short-horizon scheduling. Additional advantages are related to those of group technology (GT), such as simplifying the flow of parts and tools and reducing both set-up and production costs. The problem of formally forming part families is presented and discussed. Previous work is reviewed and assessed. Two solution approaches, one based on a location model, the other on simulated annealing, are presented and compared along with test results. The location formulation, which results in an integer programming model solved by Lagrangian relaxation, proved capable of producing solutions of excellent quality, but only for relatively small problem instances. In contrast, simulated annealing, which is a general heuristic approach to combinatorial optimization, produced solutions of comparable quality and could handle realistically large problem instances. However, careful design of the simulated annealing algorithm is crucially important. An effective design is presented.     

Fitting Hierarchical Holographic Modeling into the Theory of Scenario Structuring and a Resulting Refinement to the Quantitative Definition of Risk

A point of view is suggested from which the Hierarchical Holographic Modeling (HHM) method can be seen as one more method within the Theory of Scenario Structuring (TSS), which is that part of Quantitative Risk Assessment having to do with the task of identifying the set of risk scenarios. Seen in this way, HHM brings strongly to our attention the fact that different methods within TSS can result in different sets of risk scenarios for the same underlying problem. Although this is not a problem practically, it is a bit awkward conceptually from the standpoint of the "set of triplets" definition of risk, in which the scenario set is part of the definition. Accordingly, the present article suggests a refinement to the set of triplets definition, which removes the specific set of scenarios, found by any of the TSS methods, from the definition of risk and casts it, instead, as an approximation to the "true" set of scenarios that is native to the problem at hand and not affected by the TSS method used.     

网上拍卖交易机制有效性研究——来自淘宝网面板数据的证据

本文考察了淘宝网上信任保障和购物搜索两类交易机制的有效性.网上拍卖的交易机制越来越完善,除了信用度和好评率等基本信用指标外,网站先后建立了卖家服务质量、店铺动态评分、搜索排序等重要交易机制,本文利用淘宝网上的面板数据来验证上述机制的有效性.回归结果表明,信用度作为网上拍卖最早引入的一项信用指标仍发挥着一定的作用;店铺动态评分和卖家服务质量没有发挥应有的作用.进一步的解释是:网上市场存在较高的搜寻成本,买家利用搜索排序来降低搜寻成本,信用度的重要性因而被信用度排序放大;买家无法根据店铺动态评分和卖家服务质量进行筛选排序,导致这两大机制没有发挥应有作用.购物搜索在网上交易中发挥着重要作用,信任机制依赖搜索工具发挥作用.除混合数据OLS回归外,本文还利用面板数据和联立方程回归分析控制了遗漏变量偏误和内生性问题.