Technical note: Finite-time regret analysis of Kiefer-Wolfowitz stochastic approximation algorithm and nonparametric multi-product dynamic pricing with unknown demand

We consider the problem of nonparametric multi-product dynamic pricing with unknown demand and show that the problem may be formulated as an online model-free stochastic program, which can be solved by the classical Kiefer-Wolfowitz stochastic approximation (KWSA) algorithm. We prove that the expected cumulative regret of the KWSA algorithm is bounded above by where κ₁, κ₂ are positive constants and T is the number of periods for any T = 1, 2, … . Therefore, the regret of the KWSA algorithm grows in the order of , which achieves the lower bounds known for parametric dynamic pricing problems and shows that the nonparametric problems are not necessarily more difficult to solve than the parametric ones. Numerical experiments further demonstrate the effectiveness and efficiency of our proposed KW pricing policy by comparing with some pricing policies in the literature.     

冲压增程弹进气道设计方法与性能分析

以冲压增程弹为应用背景进行了进气道设计.结合增程弹的特点,讨论了轴对称进气道中心锥参数、喉道参数、外罩参数的选择.特别对进气道唇口处参数、扩张段角度设计方法进行了分析.设计了单锥混压式、单锥外压式以及双锥混压式三种进气道,并进行了数值模拟.分析了进气道主要设计参数对其性能的影响.数值结果表明,就增程弹的性能要求而言,双锥混压式进气道的性能较高.     

未知新生目标强度的多目标概率假设密度滤波算法

针对标准概率假设密度滤波器要求,新生目标强度作为先验信息需已知的工程限制,提出一种未知新生目标强度的多目标概率假设密度算法。该算法以概率假设密度滤波器为基础,通过充分利用目标运动信息及其与监视区域的相对关系来获取源于潜在新生目标的量测,并以此建模下一时刻滤波器所需的新生目标强度。仿真结果表明,所提算法在含有未知新生目标跟踪场景具有鲁棒的滤波性能,且其跟踪精度和计算代价均优于相关多目标PHD滤波器。     

浅谈创新与标准化

标准化是通过制定和实施标准，使重复事务达到统一以获得最佳秩序和社会效益的技术。国防科技工业是国家战略性产业，是产品研制生产的物质和技术基础，是国家创新体系的一支重要力量。标准化是国防工业现代化建设与管理的技术基础。高质量高水平的标准是建设现代化国防的重要技术基础。胡锦涛总书记对“十一五”时期国防科技工业提出明确要求“坚持强化基础，自主创新，努力提高科研和制造水平”。     

民用科技成果转军用的探讨与研究

大力推动民用科技成果适时向军用领域转移,是实现国防资源优化配置、提高国防建设效益的重要途径,也是世界主要发达国家走军民兼容之路的具体发展战略。鉴于目前我国在民用科技成果转军用方面还存在一些亟需解决的问题,文章以民用科技成果转军用的实际状况为研究基础,构建民用科技成果转化体系与机制,旨在为我国民用科技成果转化工作提供有益参考。     

靶场试验与鉴定项目风险管理探讨

靶场试验与鉴定中的风险发生可能会对试验与鉴定目标的实现造成较大的负面影响，要求管理者主动采取有效的风险管理方法来减少风险发生的概率或降低风险带来的损失。鉴于靶场试验与鉴定的项目特性，将项目风险管理的方法应用于靶场试验与鉴定风险管理中，分别从风险管理组织构建、风险识别与评估、风险应对处理策略、风险管理总结评价几个方面进行探讨，为靶场试验与鉴定管理提供借鉴。     

The lobbies’ network at the EU policy level: the case of security and defense

Lobbyists may not share the same interests, but they usually agree to form a link in a network which could eventually be used to spread information, to search for potential partners, to speak with one voice to decision makers. In other words, social links represent value for lobbyists because they may ultimately facilitate access. In this article, we explore the network of the Security and Defense lobbies in the EU and we describe its structure.     

Suppression of enemy air defenses (SEAD) as an information duel

Blue strike aircraft enter region ? to attack Red targets. In Case 1, Blue conducts (preplanned) SEAD to establish air superiority. In the (reactive) SEAD scenario, which is Case 2, such superiority is already in place, but is jeopardized by prohibitive interference from Red, which threatens Blue's ability to conduct missions. We utilize both deterministic and stochastic models to explore optimal tactics for Red in such engagements. Policies are developed which will guide both Red's determination of the modes of operation of his engagement radar, and his choice of Blue opponent to target next. An index in the form of a simple transaction kill ratio plays a major role throughout. Published 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 723–742, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/nav.10046