Control, stress, and job satisfaction in Canadian nurses

The main effects of four domains of control (task, decision, resource, physical environment) on job satisfaction and their interactions with three types of job stressors (task demands, role conflict, interpersonal conflict) were examined in a sample of 765 Canadian nurses. Multiple regression analyses were conducted to determine the proportion of variance in job satisfaction that could be accounted for by job stressors, control, and the interaction of stressors and control in that order. The job stressors were analysed separately and as a composite job demands score, as were the four domains of control. The results indicated that the proportion of variance in job satisfaction increased with the addition of control for the composite scores and for task, resource, and physical environment control. However, decision control did not account for additional variance in job satisfaction above that for any of the job stressors. In addition, none of the stressor x control interactions were significant. The results support previous attempts to test the moderating effects of control, suggesting that perceived control is not a moderator of job stress but rather that it has a direct influence. The relevance of the different domains of control for nurses is discussed.     

成电8010分布式計算机之特点

成电8010是基于单板机开发成功的分布式微机过程控制系统。该系统的性能特点是任务的动态调度、机间合作、优美降级和资源分享等。这些特点使其应用非常成功。本文就是对这些性能特点作相应的分析和介绍。     

重新定位工程制图课程的教学目标和任务

根据新时期对人才素质、能力的要求和工程图学的发展变化,分析了传统的工程制图课程教学定位的不足,依据素质教育的要求和图形的作用,提出了工程制图课程教学的两个层次,以及它们的教学目标和任务.     

任务转换中的执行控制研究

个体的认知活动总是在不同的任务之间转换。有关任务转换中的执行控制的研究,一般把任务转换分为同时性程序和继时性程序两种类型。目前主要有 6 种理论解释:“从注意到行动”理论(ATA)、“前额叶执行”理论(FLE)、执行控制阶段模型(SMEC)、“策略性反应—延迟”理论(SRD)、两成分模型(TCM)以及平行分配加工理论(PDP)。这些理论从不同的角度阐述了任务转换中的执行控制机制。它们之间相对独立而又紧密联系,为探讨个体的认知机制提供了重要的理论基础。     

A Tighter Extra-Resource Analysis of Online Deadline Scheduling

This paper is concerned with online algorithms for scheduling jobs with deadlines on a single processor. It has been known for long that unless the system is underloaded, no online scheduling algorithm can be 1-competitive, i.e., matching the performance of the optimal offline algorithm. Nevertheless, recent work has revealed that some online algorithms using a moderately faster processor (or extra processors) can guarantee very competitive performance Kalyanasundaram and Pruhs, 2000 or even be 1-competitive Koo et al., 2002; Lam and To, 2001. This paper takes a further step to investigate online scheduling algorithms with an even higher performance guarantee (i.e., better than 1-competitive algorithms) and in particular, presents an extra-resource analysis of the earliest-deadline-first strategy (EDF) with respect to such a higher performance guarantee.A preliminary version of this paper has been accepted by The Australian Theory Symposium on Computing, 2004.This research was supported in part by Hong Kong RGC Grant HKU-7024/01E.     

Scheduling Truck Arrivals at an Air Cargo Terminal

We consider the scheduling of truck arrivals at an air cargo terminal. By coordinating arrivals of cargo delivery trucks with outbound flight departure schedules, some of the shipments can be transferred directly to the departing flights, while others will be stored at the terminal's storage facility and incur extra handling and storage costs. The objective is to obtain a feasible schedule so as to minimize the total cost of operations. We formulate the problem as a time‐indexed integer program and show that, even with limited number of unloading docks at the terminal, the problem is non‐trivial (NP‐hard in the strong sense). Our solution method includes an exact solution procedure to determine an optimal unloading sequence for the shipments carried by each truck, together with a Lagrangian relaxation‐based heuristic for assigning trucks to truck docks and determining truck arrival times. We conducted computational experiments to test the performance of our solution method. Computational results show that our method can generate near‐optimal solutions efficiently. Our simulation results indicate that the scheduling approach proposed in this paper has the potential to generate significant cost savings over a first‐come, first‐served approach currently used at the air cargo terminal that we observed.     

Intelligent Procedures for Intra‐Day Updating of Call Center Agent Schedules

For nearly all call centers, agent schedules are typically created several days or weeks before the time that agents report to work. After schedules are created, call center resource managers receive additional information that can affect forecasted workload and resource availability. In particular, there is significant evidence, both among practitioners and in the research literature, suggesting that actual call arrival volumes early in a scheduling period (typically an individual day or week) can provide valuable information about the call arrival pattern later in the same scheduling period. In this paper, we develop a flexible and powerful heuristic framework for managers to make intra‐day resource adjustment decisions that take into account updated call forecasts, updated agent requirements, existing agent schedules, agents' schedule flexibility, and associated incremental labor costs. We demonstrate the value of this methodology in managing the trade‐off between labor costs and service levels to best meet variable rates of demand for service, using data from an actual call center.     

任务类型、任务难度对中国学习者语用标记语使用的影响——基于真实口语语料的调查分析

对抽样调查中的真实语料及英语为母语者的语料库对比分析表明:中国英语学习者在语用标记语的使用方面同母语者有很大的差别;任务类型、任务难度对语用标记语的使用有一定影响。研究结果表明:语用标记语的教授应该成为英语口语教学的重要内容。教师可通过选择认知负担适当的任务来操纵资源的分配,以最大可能地实现学生对于语用标记语的恰当使用和习得。     

邓小平发展观论纲

"发展是硬道理",是邓小平理论的核心,是马克思主义中国化的灵魂。发展决定社会主义的命运、发展是党执政兴国的第一要务、发展必须是可持续发展,这三个方面内涵明晰深刻,内在联系紧密,系统地构成了邓小平发展观。