物流合理配送问题的多阶段建模优化求解方法

简述了现有货物配装问题在实际应用中的缺陷,并针对货物配送问题,提出了多阶段建模优化求解方法,并应用于实例中。实例证明该方法所求得的最优解更具合理性和实际意义。     

What cloud interoperability connotates for EU policy making: Recurrence of old problems or new ones looming on the horizon?

One of the key factors for a thriving cloud computing market is the ‘interoperability’ between the relevant hardware and software that govern the cloud services. While a complete interoperability means different cloud users being able to exchange the management tools, server images and other software, this is infrequently realised because users are locked into (proprietary) cloud ecosystems. This (problem of vendor lock-in) is potentially accompanied with another problem revolving around the content delivery networks being integrated with the distinct clouds along with possible harms to media pluralism as well as interoperability. In view of these concerns, this study focuses on competition law, standardisation and regulatory policies, and elaborates on to what extent cloud interoperability needs to be secured under EU legal fora. Overall, it is found that vendor lock-in might be attended by ‘coupling’ and complex ‘layering’ strategies, whereas efficiency and/or security based justifications would arise as the counter-balancing reasons. Based on the findings, the study concludes that while focusing on the vertical (i.e., vendor lock-in) concerns, a comprehensive viewpoint needs to be upheld, allowing efficiencies (i.e., proprietary enhancements) based on the architectural design and innovations, obviating narrowly-fashioned (i.e., foreclosure-based) interventions such as in Microsoft case. It is also underlined that cloud interoperability has a content dimension that would require a broader perspective, extending to horizontal concerns and requirements within the context of EU policy making strategies.     

Editorial

Technological change is altering the way educators deliver subject content. The phenomenal growth and widespread acceptance of the Internet has seen the creation of the Virtual Learning Environment (VLE) in higher education. For the ease of integration of VLEs in higher education, software companies have provided products such as WebCT and Blackboard. From a pedagogical perspective, new technologies must be evaluated in an effort to establish whether their introduction has had a beneficial impact on learning outcomes. To this end, this investigation examines the attitudes of undergraduate accounting students in relation to a number of design features and attributes of WebCT (e.g. bulletin boards, on-line assessment and chat room) as a VLE. Responses from 292 on-campus undergraduate students provided data which associates four factors with improved student motivation. This study found that student satisfaction with the use of a VLE is significantly associated with the provision of: lecture notes, bulletin board, on-line assessment and other tools (chat and video summaries). The diagrammatic representation of the variables identified in this study provides a useful reference point for those educators contemplating the implementation of a VLE.     

基于Web服务的异构数据共享发布模型

计算机的普及促进了办公自动化的发展,但是由于信息管理系统之间缺乏总体协调统一,造成互不共享的异构信息和数据.本文在分析这个问题的基础上,提出了利用XML和WEB SERVICES技术解决异构数据共享发布的框架,并对关键实现技术进行详细的阐述.     

供应链中基于VMI库存与运输协调问题的研究

通过对1个供应商、N个零售商组成的供应链形式的协调问题研究,提出了在VMI系统中协调库存与运输的配送策略。这种配送策略假设需求是Poisson随机过程,以更新理论为基础,基于供应商有权持有小额定单,直到定单数量到达一定程度时进行一起派送,即通过规模经济运输,达到降低成本的目的。     

网络计量学在网络计量应用中的欠缺

本文通过网络计量学的应用领域分析，提出了网络计量学发展中所面临的问题和局限。     

ISOLATING THE WILD CARD OPTION

Many embedded options are difficult to value the wild card option in the Treasury bond futures contract is one of these embedded options. We illustrate how narrow theoretical bounds on the value of this option, relative to the price of the contract, may be obtained in the presence of other embedded options. Simulations suggest that the value of the wild card option is close to zero. This implies that, in this economy, a simpler pricing model of the Treasury bond futures contract, which ignores the wild card option, will result in only a small loss of accuracy.     

Recreation vehicles : A perspective

The growth and popularity of recreation vehicles in the United States and other countries has implications for the travel and tourism industry. Owners of these vehicles require no separate lodging facilities while traveling and rarely patronize hotels or motels. They often perceive that they spend less for their vacations by staying at travel parks and campgrounds, but survey results and comparative cost analysis reveal that they spend more than automobile travelers when total fixed and variable costs are taken into account. Recreation vehicle (RV) preferences by income category suggest alternative modes of recreation travel and a vacation life style which has considerable appeal. This “RV life style” is characterized by a strong desire to experience the outdoors and socialize with other campers while still retaining the comforts and conveniences of a familiar domicile. Limiting characteristics include the provincial nature of recreation vehicle travel and the impact of mandatory fuel conservation measures.     

商品房买卖中房屋损毁的风险承担问题

本文通过对一房二卖中的风险转移问题进行质疑,从而提出商品房买卖中风险承担的问题,通过分析得出把房屋毁损、灭失的风险负担归于所有权人,而不是房屋占有人,以所有权的转移来确定风险的转移,是符合法律的正当性并有利于房地产市场正常发展的。     

The shipping strategies of internet retailers: Evidence from internet book retailing

Managing the shipment of goods to consumers is one of the central aspects of retail competition on the internet. In this article, we analyze internet retailers’ shipping strategies using data from the internet book retailing industry. We find that, controlling for a variety of observable firm characteristics, firms with lower product prices offer lower shipping fees and higher quality shipping in terms of average delivery time, compared to firms with higher product prices. These patterns cannot be readily reconciled with a large class of models of competition under perfect consumer information. Theories based on imperfect consumer information can explain the findings better.