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基于X射线脉冲星导航定位方法是一种全新的自主导航技术。该文给出了脉冲星绝对定位的基本原理,针对有关文章存在的疑问,提出了脉冲星导航绝对定位中整周模糊度改进算法,并对其进行了深入的分析和理论推导,通过仿真计算脉冲星整周模糊度和航天器的位置,得到了较理想的定位精度。这种新改进的整周模糊度算法为脉冲星绝对定位提供了新的思路。 相似文献
153.
沙鸿瀚 《中国人民武装警察部队学院学报》2010,26(5):35-38
在现代刑事诉讼中,证人出庭作证是诉讼的直接言词原则和控辩对抗原则的典型体现,但实践中证人出庭作证的比率极低。我国法律虽然规定了对举报人、证人权利的保护,但操作性严重缺失,实践效果堪忧。应当借鉴域外刑事证人保护制度,结合我国国情,合理构建与现代刑事诉讼机制相适应的证人权利保护体系。 相似文献
154.
综合大学背景下如何使培养的师范类人才保持鲜明的师范特色,又要师范生具有深厚的学术背景,作者在培养目标、培养制度、课程方案、实践环节等方面进行了阐述,并进行了有益的实践。 相似文献
155.
We investigate the problem in which an agent has to find an object that moves between two locations according to a discrete Markov process (Pollock, Operat Res 18 (1970) 883–903). At every period, the agent has three options: searching left, searching right, and waiting. We assume that waiting is costless whereas searching is costly. Moreover, when the agent searches the location that contains the object, he finds it with probability 1 (i.e. there is no overlooking). Waiting can be useful because it could induce a more favorable probability distribution over the two locations next period. We find an essentially unique (nearly) optimal strategy, and prove that it is characterized by two thresholds (as conjectured by Weber, J Appl Probab 23 (1986) 708–717). We show, moreover, that it can never be optimal to search the location with the lower probability of containing the object. The latter result is far from obvious and is in clear contrast with the example in Ross (1983) for the model without waiting. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009 相似文献
156.
目录服务是面向服务架构的战场环境保障系统的重要功能,其根本目的是使分布、海量战场环境信息形成面向任务的数据集,供作战人员使用.为了规范战场环境信息目录服务并实现智能查询功能,将OGC-CSW规范和本体引入战场环境信息目录服务的设计中,建立了战场环境信息目录服务框架,并重点对面向任务的元数据信息模型、任务本体模型以及语义查询机制等关键技术进行了深入研究.最后通过实验对文中方法进行了验证. 相似文献
157.
吴国平 《中国人民武装警察部队学院学报》2008,24(11):42-46
目前,我国监护法律制度还很不完善,对未成年人监护只规定了法定监护和指定监护制度,没有规定遗嘱监护和委托监护制度;现行法律规定作为指定监护的指定机关在运作实践中遇到许多问题;立法上有关监护产生的原因和监护的变更、终止事由与程序规定均不明确。这些均需要在制定我国《民法典》时进一步加以充实与完善,以充分发挥未成年人监护制度应有的作用。 相似文献
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This paper deals with search for a target following a Markovian movement or a conditionally deterministic motion. The problem is to allocate the search efforts, when search resources renew with generalized linear constraints. The model obtained is extended to resource mixing management. New optimality equations of de Guenin's style are obtained. Practically, the problem is solved by using an algorithm derived from the FAB method. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 117–142, 2002; DOI 10.1002/nav.10009 相似文献
160.
We consider a two‐stage supply chain, in which multi‐items are shipped from a manufacturing facility or a central warehouse to a downstream retailer that faces deterministic external demand for each of the items over a finite planning horizon. The items are shipped through identical capacitated vehicles, each incurring a fixed cost per trip. In addition, there exist item‐dependent variable shipping costs and inventory holding costs at the retailer for items stored at the end of the period; these costs are constant over time. The sum of all costs must be minimized while satisfying the external demand without backlogging. In this paper we develop a search algorithm to solve the problem optimally. Our search algorithm, although exponential in the worst case, is very efficient empirically due to new properties of the optimal solution that we found, which allow us to restrict the number of solutions examined. Second, we perform a computational study that compares the empirical running time of our search methods to other available exact solution methods to the problem. Finally, we characterize the conditions under which each of the solution methods is likely to be faster than the others and suggest efficient heuristic solutions that we recommend using when the problem is large in all dimensions. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006. 相似文献