On optimal scheduling for time-constrained services in multi-channel data dissemination systems

We study the problem of disseminating data of time-constrained services through multiple broadcast channels. By time-constrained services, we mean those services whose data must reach clients before a certain constrained time. Otherwise, the data would become useless or substantially less valuable to the clients. We first explore the difficulties of solving the problem and derive the theoretical minimum number of channels required for the task. Then, we propose a transformation-based data allocation (TDA) algorithm that guarantees to fulfill the task (i.e., all requested data reach the clients within the constrained time) by using the minimum number of channels. Finally, we analyze the computation complexity and prove the validity and optimality of the TDA algorithm.     

树立服务营销理念取得产品长久竞争优势

扩大市场占有率，追求市场份额数量一直是企业追求的目标。本文则提出企业要想在激烈的市场竞争中取胜，提高市场份额质量比追求市场份额数量更重要的观点。而通过树立服务营销理念，提高服务质量则是提高市场份额质量的有效途径，并在此基础上提出提高服务质量的对策。     

变革中的图书馆读者服务工作

网络时代标志着图书馆工作将进入一个全新的发展时期 ,变革与传统将同时存在。专业院校图书馆从读者服务工作的角度应就其发展趋势、自身存在的问题 ,及时采取应对措施     

Resource allocation on computational grids using a utility model and the knapsack problem

This work introduces a utility model (UM) for resource allocation on computational grids and formulates the allocation problem as a variant of the 0–1 multichoice multidimensional knapsack problem. The notion of task-option utility is introduced, and it is used to effect allocation policies. We present a variety of allocation policies, which are expressed as functions of metrics that are both intrinsic and external to the task and resources. An external user-defined credit-value metric is shown to allow users to intervene in the allocation of urgent or low priority tasks. The strategies are evaluated in simulation against random workloads as well as those drawn from real systems. We measure the sensitivity of the UM-derived schedules to variations in the allocation policies and their corresponding utility functions. The UM allocation strategy is shown to optimally allocate resources congruent with the chosen policies.     

Online scheduling on two uniform machines subject to eligibility constraints

We consider the online scheduling of a set of jobs on two uniform machines with the makespan as objective. The jobs are presented in a list. We consider two different eligibility constraint set assumptions, namely (i) arbitrary eligibility constraints and (ii) Grade of Service (GoS) eligibility constraints. In the first case, we prove that the High Speed Machine First (HSF) algorithm, which assigns jobs to the eligible machine that has the highest speed, is optimal. With regard to the second case, we point out an error in [M. Liu et al., Online scheduling on two uniform machines to minimize the makespan, Theoretical Computer Science 410 (21–23) (2009) 2099–2109]; we then provide tighter lower bounds and present algorithms with worst-case analysis for various ranges of machine speeds.     

泛在网络架构的研究

结合国际主要标准组织——ITU-T的最新标准化情况,韩国、日本的一些产业化情况以及欧盟的一些研究项目,介绍了泛在网络的一些发展趋势和情况,提出了泛在网络的架构和其可能包含的内容。     

如何提高工频有芯感应炉的使用寿命

本文阐述了影响上引法连铸铜杆生产线中工频有芯感应炉使用寿命的各种因素 ,重点探讨了耐火材料的选择、粒度、配比、筑炉方法、烤炉制度、熔沟维护和监测以及熔沟形状和炉子结构等对提高工频有芯感应炉炉龄所起的作用。     

Do they see eye to eye? Management and employee perspectives of high-performance work systems and influence processes on service quality.

Extant research on high-performance work systems (HPWSs) has primarily examined the effects of HPWSs on establishment or firm-level performance from a management perspective in manufacturing settings. The current study extends this literature by differentiating management and employee perspectives of HPWSs and examining how the two perspectives relate to employee individual performance in the service context. Data collected in three phases from multiple sources involving 292 managers, 830 employees, and 1,772 customers of 91 bank branches revealed significant differences between management and employee perspectives of HPWSs. There were also significant differences in employee perspectives of HPWSs among employees of different employment statuses and among employees of the same status. Further, employee perspective of HPWSs was positively related to individual general service performance through the mediation of employee human capital and perceived organizational support and was positively related to individual knowledge-intensive service performance through the mediation of employee human capital and psychological empowerment. At the same time, management perspective of HPWSs was related to employee human capital and both types of service performance. Finally, a branch's overall knowledge-intensive service performance was positively associated with customer overall satisfaction with the branch's service. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Asymptotic Analysis of Quick Service Systems with Nonhomogeneous Structure

An asymptotic distribution of the instant of first failure in models with quick service, structural heterogeneity, and variable service discipline is investigated.     

IP新业务在电力系统中的应用

介绍了IP新业务在电力系统中的应用，包括IP网络电话、IP视频会议系统、IP图像监控和基于IP的客户服务中心。