OAF框架在电子商务平台开发中的研究

文章主要介绍了OAF框架的组成、电子商务平台的模块设计以及OAF框架在电子商务平台上的应用。     

持久层的设计与实现研究

文章在分析软件体系结构层次和特点的基础之上,阐述了在软件体系结构中引入持久层的必要性,深入分析了持久层的本质及其设计思想,并通过设计模式来完成持久层的设计与实现。     

Three‐period,two‐treatment crossover design under long‐term carryover effect

The paper describes non‐parametric approach for analysis of a three‐period, two‐treatment, four‐sequence crossover design in which test procedure for interchangeability of the treatment effects is obtained. The proposed procedure is based on a non‐parametric model, which incorporates, along with the direct treatment effects and the usual carryover effects, the long‐term carryover effects. Relevant competitors are obtained. Related asymptotic results are given. By performing simulation study, we compared the procedures with respect to type I error rate and power. Furthermore, confidence intervals for treatment differences are studied. The procedures are illustrated with a data study.     

Towards collaborative, intermodal hub networks: A case study in the fast moving consumer goods market

Collaborative hub networks can provide an answer to the need to decrease logistics cost and maintain logistics service levels by shifting consolidated flows to modes that are better suited for handling large volumes (rail, barge, coastal shipping), so economies of scale can be obtained. This necessity has been increased by the tendency of globalization of industries, smaller shipments sizes, high frequencies, and the fragmentation of flows. Through collaboration the necessary synchronization between expensive but fast and flexible means of transport and inexpensive, but slow and inflexible means can be combined in an intermodal hub network. This paper shows the rationale behind these collaborative hub networks, based on the literature on the design of many-to-many hub networks. The resulting methodology is explained through presenting the results of the design and implementation of collaborative hub network for the distribution of fast moving consumer goods using a combination of trucking and inland barges. This concept, first proposed by Vermunt [Vermunt, A.J.M., 1999. Multilognet, the intelligent multimodal logistics network, an important node in the worldwide logistics net, Vermunt Logistiek Advies v.o.f., working paper (in Dutch)], won the European Intermodal Award of the European Intermodal Association in 2003, and after extensive research was launched in The Netherlands as a commercial pilot by logistics service provider Vos Logistics and barge operator Riverhopper in January 2004.     

Optimal insurance in the presence of reinsurance

This paper studies an optimal insurance and reinsurance design problem among three agents: policyholder, insurer, and reinsurer. We assume that the preferences of the parties are given by distortion risk measures, which are equivalent to dual utilities. By maximizing the dual utility of the insurer and jointly solving the optimal insurance and reinsurance contracts, it is found that a layering insurance is optimal, with every layer being borne by one of the three agents. We also show that reinsurance encourages more insurance, and is welfare improving for the economy. Furthermore, it is optimal for the insurer to charge the maximum acceptable insurance premium to the policyholder. This paper also considers three other variants of the optimal insurance/reinsurance models. The first two variants impose a limit on the reinsurance premium so as to prevent insurer to reinsure all its risk. An optimal solution is still layering insurance, though the insurer will have to retain higher risk. Finally, we study the effect of competition by permitting the policyholder to insure its risk with an insurer, a reinsurer, or both. The competition from the reinsurer dampens the price at which an insurer could charge to the policyholder, although the optimal indemnities remain the same as the baseline model. The reinsurer will however not trade with the policyholder in this optimal solution.     

A structural framework for modelling contingent capital

This paper develops a structural model of contingent capital. In contrast to existing approaches we explicitly link the firm’s total payout to its cost of debt, leading to a total payout that is linear in—as opposed to proportional to—asset value. In the special case that asset value evolves as affine geometric Brownian motion we derive closed-form expressions for limiting (i.e. perpetual) bond values. The proposed model is flexible, so that it can be used to gauge the relative merits of different variations of contingent capital, and parsimonious, so that it is relatively easy to implement in practice. An empirical example using data from the Canadian banking sector is provided that illustrates how the model can generate insights into problems that are of interest to both regulators and issuers of contingent capital (e.g. what range of conversion prices would be consistent with regulatory guidelines, and how expensive is contingent debt over this range).     

创新项目组合管理绩效关键影响因素的实证研究

为了维持长期的竞争优势,企业需要不断进行技术创新和产品创新。如何在有限的研发资源下使创新项目组合的绩效最大化是企业进行创新管理中面临的主要问题。本文从创新项目组合的战略一致性、平均项目绩效和业务协同3个指标来度量创新项目组合管理绩效,并从流程和管理者的视角研究其关键影响因素。通过实证研究发现,高管参与和项目组合管理流程的设计与实施对项目组合的战略一致性有显著的正向影响;高管参与、项目经理胜任力和项目终止质量对平均项目绩效有显著正向影响;项目经理胜任力、项目组合管理流程的设计与实施和项目中止质量对业务协同有显著正向影响。     

Extending multi-tenant architectures: a database model for a multi-target support in SaaS applications

Multi-tenant architectures (MTAs) are considered a cornerstone in the success of Software as a Service as a new application distribution formula. Multi-tenancy allows multiple customers (i.e. tenants) to be consolidated into the same operational system. This way, tenants run and share the same application instance as well as costs, which are significantly reduced. Functional needs vary from one tenant to another; either companies from different sectors run different types of applications or, although deploying the same functionality, they do differ in the extent of their complexity. In any case, MTA leaves one major concern regarding the companies’ data, their privacy and security, which requires special attention to the data layer. In this article, we propose an extended data model that enhances traditional MTAs in respect of this concern. This extension – called multi-target – allows MT applications to host, manage and serve multiple functionalities within the same multi-tenant (MT) environment. The practical deployment of this approach will allow SaaS vendors to target multiple markets or address different levels of functional complexity and yet commercialise just one single MT application. The applicability of the approach is demonstrated via a case study of a real multi-tenancy multi-target (MT²) implementation, called Globalgest.     

技术路线图方法设计研究回顾

通过回顾有关技术路线图的研究文献,探讨了当前技术路线图方法设计的研究状况,尤其是特定应用情境下产业技术路线图定制化方法设计的研究,归纳、总结了当前研究的方法、成果以及不足之处,指出目前尚未有文献提出适用于特定情境的产业技术路线图通用定制化方法以及相关研究较少,并提出了后续研究方向。     

考虑终止权的两阶段研发投资激励和合同设计

针对产品研发过程中的投资激励问题,分别建立了存在终止权和不存在终止权两种情况下的两阶段研发投资决策模型,并利用逆向归纳法讨论了委托方的偿付合同设计。研究结果表明:当第一阶段的研发结果为高质量时,代理人在第二阶段的投资积极性更高,代理人在第一阶段的投资水平和委托方支付的最优偿付都随着低质量时研发成功的比例系数而单调递减;研发活动的终止威胁导致代理人的投资积极性降低;在一定范围内,或有终止权偿付合同能够缓解信息不对称时的投资不足问题、提高双方的研发合作效率。