敏捷成像卫星快速需求筹划算法

敏捷成像卫星需求筹划主要解决如何判断敏捷卫星对地观测需求是否可执行以及何时执行的问题。首先，根据敏捷卫星对地观测的约束和特点，将敏捷卫星对地观测场景抽象成基于力学的理想弹簧系统，提出了常量机动时间和劲度系数的计算方法，实现模型关键参数的映射；然后，提出了一种启发式算法，利用理想弹簧系统的平衡状态时对应观测综合角度和最小的特点，通过计算系统的力平衡状态求解多个观测需求的整体最佳观测时间；最后，利用实际的观测需求，通过仿真对比验证了算法的有效性。仿真结果显示，所提算法提高了观测需求满足率和需求的优先级权重和，并且整体成像质量最优。     

敏捷成像卫星需求筹划系统应用探析

作为一类具有大范围、快速机动能力的对地观测卫星,敏捷成像卫星在提高卫星观测效率的同时,也使得卫星需求的筹划与调度变得更加的复杂和困难,给卫星需求筹划技术带来了新的挑战。针对敏捷成像卫星的多种特殊工作模式,分析了敏捷成像卫星需求筹划的技术特点和约束条件,从工程应用实际出发,建立了一套基于复杂需求分解和动态规划调整的敏捷卫星地面需求筹划系统,并根据实际的应用需求,给出了相应的应用实例,最后进一步展望了未来敏捷成像卫星需求筹划的发展方向。     

同步卫星转发器二维时频资源蚁群调度算法

针对地球同步卫星转发器多任务时频资源调度问题，考虑任务执行时间和占用带宽需求，建立了以卫星系统总收益为目标的多约束规划模型，提出了基于任务频率时间窗口更新的蚁群调度算法。该算法综合考虑了任务优先级和时间灵活度，以增强蚁群在状态转移规则下的搜索能力；同时设计了虚拟任务、伪随机状态转移规则和信息素参数，保证算法向最优解逐步收敛。实例仿真表明，该算法相对于传统蚁群算法、遗传算法和启发式算法，在算法结果、寻优能力和稳定性方面具有显著优势。     

卫星信息支持海域感知关键技术分析

基于对地观测卫星资源的发展和应用,针对海域感知对卫星信息的需求,结合卫星 信息时效性、多元异类卫星信息融合处理、卫星与其他态势感知手段协同使用等问题,分析 梳理了基于卫星信息的海域感知关键技术,主要包括面向航母编队信息保障的快速反应技术 、面向任务的异种平台协同任务规划及基于效能的异类多平台协同策略优化技术、目标信息 快速处理技术、水下目标探测技术等。     

震后应急物流系统中带时间窗双层数学规划LRP

针对震后应急物流系统中的多层次设施定位和运输路线挑选,考虑震后初期应急物资配送的特征,提出了上层以总成本最小,下层以总配送时间偏差最小为目标的双层规划模型,据此进行救援过程中不同周期灾区外围应急物资集散点和灾区应急配送中心的定位,以及应急物资运输路线安排联合决策。针对模型特点,提出基于双层数学规划的禁忌搜索算法,并使用Matlab软件对其进行求解分析,最后结合算例计算结果验证了模型的有效性。     

TD-SCDMA通信基站架设的分层多目标优化模型

从.TD-SCDMA通信基站架设中所涉及的架设成本、通信容量,以及架设时间三方面的不同要求入手,建立经济效益与时间优化的具有优先级的分层多目标非线性规划模型,并给出求解该问题的宽容分层序列算法.最后进行试验,得到了问题的弱有效解,验证了此模型的可行性.     

一种两阶段的敏捷卫星任务并行调度技术

敏捷卫星灵巧的姿态机动能力令其观测能力和使用效率得到大幅提升，也使得卫星任务调度变得更加复杂和困难。首先，通过分析敏捷卫星的工作模式、任务调度特点和使用约束，构建了基于任务重要性、任务满足度和任务成像质量等目标的敏捷卫星任务调度优化模型；然后，通过对敏捷卫星多种成像模式进行统一编码，设计了一种新的差分变异策略——基于排名的变异算子，提出了基于主从式的改进并行差分进化算法；最后，和基于时间轴的成像质量贪心算法相结合，给出一种新的两阶段敏捷卫星观测任务调度方法，并通过仿真对比验证了方法的有效性。     

卫星通信及其应急通信系统研究

文章简要介绍了卫星应急通信的概念,组成及特点,探讨了卫星与地面固定网、地面移动网及无线接入技术的融合应用的应急通信系统平台的构建方法,并指出了卫星应急通信系统的未来发展趋势。     

新形势下如何保障基层台站业务正常运行的几点思考

为适应我国经济快速发展,拓宽气象服务领域和地面气象观测新技术的发展要求,察隅县气象局按照中国气象局统一安排于2012年3月31日20时对地面观测业务软件进行了切换升级,业务改革后,基层台站相应的观测任务发生了改变,取消了气压、气温、湿度、风向、风速等自记仪器的观测;取消了天气报、加密天气报的编发和报文上传,用新格式的长Z文件代替。面对新的业务要求,我局在岗测报人员在业务能力、年龄层次、知识结构等方面存在的诸多矛盾及其差距凸显了出来,为了解决矛盾、缩短差距,尽快适应地面气象观测业务改革要求,保障地面气象观测业务正常运行,本文围绕强化制度管理、提升测报人员业务技能、完善应急措施等三个方面,对保障察隅县气象局地面气象观测业务工作正常运行进行探讨。     

技工院校计算机排课系统设计与实现

实现一个高效智能的计算机排课系统是众多学校的强烈需求。本文以教学任务为基本单位,采用基于模拟人工思维的方法,考虑了时间优先级,对教学任务的时间和教室的编排分配采用优化资源查找的算法。     

中继雨衰对载人航天的影响及解决措施

针对中国载人航天任务中遇到的中继卫星雨衰问题,对当前“天链”系列3颗中继卫星Ka频段数传信道的雨衰性能进行定量分析,讨论了中继雨衰对载人航天任务可能造成的影响。依据分析结果,考虑环境条件、客观因素限制和载人航天任务的特点,提出了应对中继雨衰的飞控实施方案和减少雨衰影响的方法,可为后续载人航天任务提供参考。     

Comparison processes in task perceptions,evaluations, and reactions

The primary objective of this article is to present a social comparison model of how employees perceive, evaluate, and react to tasks. The model represents a synthesis of recent findings in the task design area and three social comparison theories. A three-stage process is described which suggests that employees first understand their tasks at an informational level, then understand their tasks at an evaluative level, and finally react to their tasks both affectively and behaviorally. Managerial implications and future research directions are discussed.     

Service Trade and Occupational Tasks: An Empirical Investigation

Using microdata for Belgium, we investigate the relationship between changes in the task content of production and the rise in the number of service exporters. We show that occupational tasks changes display an extremely consistent relationship with participation to service exports: in sectors in which the importance of face‐to‐face communication with customers has increased, the firm‐level likelihood of entering export markets has decreased; instead, the likelihood of exporting increased in sectors in which the sophistication of production and delivery has expanded (following an increase in cognitive tasks). Moreover, our analysis suggests that the change in IT use per se does not strike as being a key underlying force behind the increase in the extensive margin of service exports. These results are robust controlling for comparative advantage, offshoring, trade liberalisation and demand shifts.     

An investigation of the black-box supplier integration in new product development

This research examines black-box supplier integration in new product development (NPD). A model and several hypotheses are proposed to study the relationship between product task characteristics (importance and complexity), supplier integration, and product performance. Data from 136 U.S. high-tech firms were used to test the hypotheses. Results suggest that assessing the importance and complexity of NPD tasks is critical to the implementation of supplier integration innovation strategy. Firms are likely to perform NPD tasks that are related to firms' core competencies in-house. They tend to externalize complex tasks to suppliers in order to utilize suppliers' resources and to increase NPD speed. The black-box supplier integration influences the speed to market. However, it is more effective on speed to market when technology uncertainty is low than when technology uncertainty is high.     

Linking Mission to Learning Activities for Assurance of Learning

Can accreditation-related requirements and mission statements measure learning outcomes? This study focuses on triangulating accreditation-related requirements with mission statements and learning activities to learning outcomes. This topic has not been comprehensively explored in the past. After looking into the requirements of AACSB, ISO, and the Hong Kong Qualifications Framework (QF), “mission/objective/goal/outcome, improvement, learning, activities, review, and consistent” were identified as the key elements which can be applied to designing learning activities with a teaching log. From teachers' observations and studying the reflections of learners, it was found that “Ability, Affection, All-round Development and Appreciation” improved to align with the elements of the mission statement “Capable and Caring.” It was found that guest lectures by academics and industry practitioners can also help nurture learners' overall development. These findings are of great value as a mission statement is intended to lead to action and continuous improvement; and accreditation exercises involve mission verification and validation. Longitudinal studies of a similar nature are suggested to further test the findings of the present study.     

Mission Power and Firm Financial Performance

We estimate the effect of the mission statement on firm financial performance. The mission power, a latent construct, is included in a structural equation model to compute its impact across two channels: the profit margin and the assets turnover. Our estimates, based on a sample of Colombian companies, show that the non-significant impact of mission statement documented in the literature may be caused by the opposite effect that the amount of sales induces on both channels. We disentangle both effects and show that the effect on assets turnover dominates when mission statement compels good assets management practices.     

国企多任务努力成本相关下的高管激励问题

本文在Holmstrom和Milgrom多任务委托代理模型的分析框架下,建立国有企业的三任务模型,探讨国企多任务努力成本相关下高管激励问题。研究发现,当多任务为互补时,实现企业社会责任目标会对企业经济性任务产生互补促进性作用,有利于经济性任务目标的实现,增加可观测性较高的任务激励会带来互补性任务绩效的提高。当多任务为替代时,实现企业社会责任目标会对企业经济性任务目标的实现产生阻碍作用,不利于经济性任务目标的实现,增加可观测性较高的任务激励会带来互补性任务绩效的减少。当多任务为不相关时,任务间努力成本互相独立,实现企业的政策性任务与其他任务努力成本不相关,应剥离政策性任务。该结论对于国有企业的任务选择与指派,以及存在多任务时的激励机制设计具有重要参考价值。