Quantifying the performance effects of idle time utilization in multiserver systems

In many practical multiserver queueing systems, servers not only serve randomly arriving customers but also work on the secondary jobs with infinite backlog during their idle time. In this paper, we propose a c‐server model with a two‐threshold policy, denoted by (e d), to evaluate the performance of this class of systems. With such a policy, when the number of idle servers has reached d (<c), then e (<d) idle agents will process secondary jobs. These e servers keep working on the secondary jobs until they find waiting customers exist in the system at a secondary job completion instant. Using the matrix analytic method, we obtain the stationary performance measures for evaluating different (e, d) policies. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007.     

公安系统科研成果管理的信息化解决方案

针对公安科研工作的现状及特点,提出了适合公安科技管理部门进行信息化管理的信息系统解决方案。简要分析了系统需求,从系统数据流程、软件结构及功能框架、实现方案、系统安全保密架构几方面设计了系统体系结构,为公安科研工作提供了统一的科研成果信息化管理平台。     

论公安现役高校在构建和谐社会中的角色定位

公安现役高校在公安教育体系中处于重要位置,承担着人才培养、科学研究和服务部队的重要任务,对构建和谐社会责无旁贷。准确定位公安现役高校在构建和谐社会中所扮演的角色,可以充分发挥职能作用,为构建和谐社会做出应有贡献。     

构建和谐社会之法律思想透析

实现社会和谐始终是人类追求的一个社会理想,只是因为社会历史的不同,和谐社会思想所包含的要义以及所追求的目标也随之有所差异。但法之于和谐社会具有重要价值却是绝大多数法哲学家所认同的,即构建和谐社会离不开法律保障之基石。从中西方法律思想以及可持续发展观角度层层递进,对构建和谐社会之合理性、时代性、先导性以及法之于和谐社会的重要价值进行探讨与思索。     

再论加强公安执法人员的法治观念

法制现代化是中国当前重大的社会主题之一,它是一个历史的、发展的过程。公安法治建设必然对国家法制现代化进程产生重大的影响。公安机关的性质、地位和作用决定了公安执法人员必须具有正确的执法思想。而法律至上观念、权利本位观念、分权制衡观念、正当程序观念对公安执法人员正确执法思想的形成有着直接的影响。     

论公安现役部队机关管理效能的发挥

当前公安现役部队机关在管理方面还不同程度地存在着不到位及越位问题,分析问题产生的原因,提出充分发挥机关管理效能应采取的对策,对机关服务和保障基层建设具有重要意义。     

一种非对称鲁棒性盲水印算法

针对数字图像版权保护,提出一种非对称鲁棒性盲数字水印方法。通过将水印嵌入到最少受图像改变影响的子空间,使嵌入水印具有鲁棒性,且通过对特征子空间的选取限制,使算法具有较高的检测概率和安全性以及较低的虚警概率。同时,水印嵌入矩阵与提取矩阵不同,它可公开除密钥外的所有其它的信息,而且能实现水印盲提取。实验结果证明了该算法的鲁棒性。     

美军作战实验室的现状和发展

美军作战实验室建设走在世界的前列。从20世纪90年代初至今,美军已初步建立起从技术、战术到战役、战略,从兵种、军种到联合作战的完整实验体系。分析美军热衷于作战实验室建设的主要原因,概括介绍了美军主要的作战实验室及其主要技术手段与工作程序,分析了美军作战实验室的特点和发展趋势,在此基础上得出了组织管理与顶层设计、新技术研究与应用、需求牵引与研究成果有效应用、建设投入与重点等方面的启示,对于指导我军作战实验室建设具有重要的借鉴作用。     

Europe,Russia and the Ukraine crisis: the dynamics of coercion

This article analyses European strategy towards Russia during the Ukraine crisis between February 2014 and December 2015, conceptualising it as a coercive diplomatic strategy and analysing the relationship between its ends, ways and means. European strategy sought to reverse Russian intervention. However, this overarching aim was flanked by two ‘constraining’ aims of avoiding an escalation of the conflict and a breakdown of relations with Russia. The strategy shifted between these aims, which proved to be irreconcilable: while the EU partly succeeded in containing the conflict, it failed to reverse Russian intervention and relations between the EU and Russia deteriorated sharply.     

Optimal maintenance policies for a safety‐critical system and its deteriorating sensor

We consider the integrated problem of optimally maintaining an imperfect, deteriorating sensor and the safety‐critical system it monitors. The sensor's costless observations of the binary state of the system become less informative over time. A costly full inspection may be conducted to perfectly discern the state of the system, after which the system is replaced if it is in the out‐of‐control state. In addition, a full inspection provides the opportunity to replace the sensor. We formulate the problem of adaptively scheduling full inspections and sensor replacements using a partially observable Markov decision process (POMDP) model. The objective is to minimize the total expected discounted costs associated with system operation, full inspection, system replacement, and sensor replacement. We show that the optimal policy has a threshold structure and demonstrate the value of coordinating system and sensor maintenance via numerical examples. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 399–417, 2017