TEM4短文听写对英语专业基础教学的启示

TEM4(Test for English Majors[Grade 4])测试中，考生短文听写部分失分较多是普遍现象，这是短时记忆功能紊乱的突出反映。而短时记忆容量减少，大脑工作记忆状态不佳是短时记忆功能紊乱的主要表现形式。本文通过抽样分析TEM4短文听写考生得分情况，阐述导致短时记忆功能紊乱的主要原因及其与听写技能之间的内在关联，并进一步谈及对英语专业基础阶段教学的启示。     

进路搜索的数据结构与算法及其仿真

对铁路车站计算机联锁中的进路搜索,提出基于站场数据结构的进路自动生成搜索算法。在确定对象节点数据结构的基础上,给出了进路搜索算法的步骤。同时将站场设计功能也包含在程序中,进而可以虚拟出各种不同的站场,根据实验选择不同的进路始点和终点,可达到良好的仿真效果。     

遗传算法在动车组周转优化模型中的应用

根据高速铁路动车组的运用特点,提出了在不固定区段使用条件下,动车组的周转优化模型及求解该问题的遗传算法,并结合京沪线的有关资料,给出最优指派下动车组的使用数量的计算公式,并铺画了一个车站相关的动车组周转图。     

New product introduction with costly search

In the usual model of product market search, a low search cost can turn out to have detrimental incentives on new product introduction as the low search cost erodes firms’ market power, attenuating the profit from innovation. This paper studies a model of monopolistic competition with costly search, where the point of departure is that of a fixed cost of initiating search. In this environment, a low search cost could turn out to be favorable to innovation. At a low search cost, more consumers may decide to start searching, possibly resulting in higher profits for firms in the larger market, despite the erosion of market power.     

Consumer product search and purchase behaviour using various retail channels: the role of perceived retail usefulness

The purpose of this study was to examine the influences of consumers' perceptions of retail usefulness for product information search and their previous purchase satisfaction on their frequencies of product information search and product purchase behaviours for apparel products. These relationships were investigated in five retail settings – Internet shopping, catalogue shopping, television shopping, local retail shopping, and non‐local retail shopping. One hundred seventy‐six students in a US Midwestern university provided usable responses. The results of causal model analyses showed that the proposed model fits the data well for all five retail channels. Consumers who perceived a certain retail channel more useful for product information search searched for product information more frequently via that retail channel, and purchased products more often via that retail channel. Consumers who were more satisfied with apparel purchases from a retail channel purchased the products more frequently via that retail channel. Theoretical and managerial implications are discussed.     

Local search and the evolution of technological capabilities

The assumption that ‘local search’ constrains the direction of corporate R&D is central in evolutionary perspectives on technological change and competition. In this paper, we propose a network-analytic approach for identifying the evolution of firms' technological positions. The approach (1) permits graphical and quantitative assessments of the extent to which firms' search behavior is locally bounded, and (2) enables firms to be positioned and grouped according to the similarities in their innovative capabilities. The utility of the proposed framework is demonstrated by an analysis of strategic partnering and the evolution of the technological positions of the 10 largest Japanese semiconductor producers from 1982 to 1992.     

What Drives the Property Price-Trading Volume Correlation? Evidence from a Commercial Real Estate Market

The significant price-trading volume correlation found in the residential property market presents a challenge to the rational expectation hypothesis. Existing theories account for this fact with either capital market imperfection (down-payment effect or loss-aversion consideration) or imperfect information (search theoretic models). This paper employs data from a commercial real estate market, which face a different degree of severity of capital market constraint than the residential market, and thus provide an indirect but effective test for alternative theories. Policy implications are also discussed.     

海上遇险搜救综合通信系统的设计与实现

为了提高我国海上搜救应急反应的调度、指挥能力,利用现代通信、计算机、计算机 电信合成（CTI）等技术,实现了海上遇险搜救综合通信系统。该系统采用程控调度交换和 无线电台适配的方案,使用无线电台适配器将无线通信转换为有线通信,再通过程控交换机 将各级海上搜救中各类卫星、语音电话、视频系统等异构终端综合互联,实现有线通信系统 与无线通信系统的无缝连接,从而为值班和搜救指挥人员提供专业、便捷的通信、操作手段 ,提高指挥判断的准确性和效率。     

A tabu search heuristic for redesigning a multi-echelon supply chain network over a planning horizon

This paper addresses the problem of redesigning a supply chain network with multiple echelons and commodities. The problem belongs to a comprehensive class of network redesign problems previously introduced in the literature. Redesign decisions comprise the relocation of existing facilities to new sites under an available budget over a finite time horizon, the supply of commodities by upstream facilities, the inventory levels at storage facilities, and the flow of commodities through the network. The problem is modeled as a large-scale mixed-integer linear program. Feasible solutions are obtained by using a tabu search procedure that explores the space of the facility location variables. The latter prescribe the time periods in which changes in the network configuration occur. They are triggered by the setup of new facilities, which operate with capacity transferred from the existing facilities, and by closing the latter upon their entire relocation. As the problem is highly constrained, infeasible solutions with excess budget are allowed during the course of the search process. However, such solutions are penalized for their infeasibility. Computational experiments on realistically sized randomly generated instances indicate that this strategic oscillation scheme used in conjunction with tabu search performs very well.     

On the Welfare Gains of Price Dispersion

Can price dispersion be associated with higher levels of welfare? To answer we compare two economies that differ only in the way prices are formed. In the first, sellers post a unique price–quantity pair, with no price dispersion. In the second, sellers post a quantity only and let prices be determined ex post by realized demand, resulting in price dispersion. We show that while agents trade lower quantities when prices are dispersed (an intensive margin effect), they also trade more often (an extensive margin effect). At low inflation, the extensive margin dominates making agents better off with price dispersion.