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.     

浅谈武器装备延寿工作

随着武器装备的发展和更新，许多库存装备陆续达到存储寿命周期或使用寿命周期。在多研制、少生产的装备发展指导思想下，现有武器装备的延寿工作被摆到了突出位置。本文首先讨论了开展武器装备延寿工作的意义，而后介绍了国内外武器装备延寿工作现状及开展武器装备延寿的基本方式，最后讨论了对军代表工作的几点启示。     

C~4ISR系统需求一致性开发方法

C~4ISR系统是复杂大系统,C~4ISR系统需求工程的建设需要建立一套完整的C~4ISR系统需求体系框架和开发方法论.对C~4ISR系统需求的开发方法进行了研究,按照C~4ISR系统需求的层次,结合系统体系结构的开发方法,提出C~4ISR系统需求的分析开发过程和基于UML的模型表述方法;为保证需求模型的一致性,提出C~4ISR系统需求开发的一致性策略.     

思想政治教育对高校突发事件的防范功能研究

为维持高校和社会的和谐稳定，必须防范高校突发事件的发生。思想政治教育对高校突发事件有着特殊而重大的防范功能，它不但能为防范突发事件提供可靠的思想保证和精神动力，而且其本身就是防范突发事件的重要手段。思想政治教育在思想引导、心理干预、利益协调、情绪宣泄、预防文化教育和预警等方面都具有对高校突发事件的防范功能。     

基于子孔径图像的低频SAR多通道均衡方法

利用多通道SAR系统进行运动目标指示时,通道间的幅相失配严重影响了运动目标检测以及参数估计的性能。针对多通道低频SAR/GMTI系统,提出了一种基于子孔径SAR图像的多通道均衡方法。该方法利用相同视角的多通道子孔径图像,估计该角度对应的幅相误差,在达到较高幅相误差估计精度的同时,也能适应误差随视角的变化。基于车载低频多通道SAR/GMTI实测数据的实验结果表明:该方法能有效地补偿不同通道之间的幅相误差,提高运动目标的检测和参数估计性能。     

Determination of burn‐in parameters and residual life for highly reliable products

Today, many products are designed and manufactured to function for a long period of time before they fail. Determining product reliability is a great challenge to manufacturers of highly reliable products with only a relatively short period of time available for internal life testing. In particular, it may be difficult to determine optimal burn‐in parameters and characterize the residual life distribution. A promising alternative is to use data on a quality characteristic (QC) whose degradation over time can be related to product failure. Typically, product failure corresponds to the first passage time of the degradation path beyond a critical value. If degradation paths can be modeled properly, one can predict failure time and determine the life distribution without actually observing failures. In this paper, we first use a Wiener process to describe the continuous degradation path of the quality characteristic of the product. A Wiener process allows nonconstant variance and nonzero correlation among data collected at different time points. We propose a decision rule for classifying a unit as normal or weak, and give an economic model for determining the optimal termination time and other parameters of a burn‐in test. Next, we propose a method for assessing the product's lifetime distribution of the passed units. The proposed methodologies are all based only on the product's initial observed degradation data. Finally, an example of an electronic product, namely contact image scanner (CIS), is used to illustrate the proposed procedure. © 2002 Wiley Periodicals, Inc. Naval Research Logistics, 2003     

中庭防排烟系统性能化设计探析

阐述中庭防排烟性能化设计的具体过程 ,并对防排烟系统设计的运用进行举例。     

精神困境·救赎之路·孤独之旅—谈鲁迅与史铁生

史铁生是当代著名作家，他的作品思想深邃，精神探索超前，艺术方面也达到一定高度，鲁迅对他的影响很深刻，二人的创作无论在内容方面还是在艺术方面都有异曲同工之妙，二人共同关注着精神困境和生命本真，共同寻找和思考救赎之路，并且用三种相同的方式表达孤独。     

挠性接管在轴对称载荷下的应力应变计算

针对目前挠性接管强度计算存在的不足,在充分考虑骨架层的弯曲刚度和扭转刚度对挠性接管强度影响的基础上,推导出在承受轴对称负荷(拉压、扭矩及内压)时,挠性接管及其加强筋的应变和外力的关系,为挠性接管的结构设计和强度计算提供了理论公式.     

基于三对Bell态纠缠交换的QDKD方案

提出了一种基于三对Bell态纠缠交换的量子确定性密钥分发方案(Quantum Deterministic Key Distribution,QDKD),该方案充分利用量子纠缠交换的原理,通过对三对Bell态进行纠缠、测量操作,并辅以经典信息实现确定性密钥的分发,方案中任何窃听行为都会被及时发现。同基于两对Bell态纠缠交换的QDKD方案相比,协议利用三对Bell态并使用两种方法实现确定性密钥信息的分发。分析结果表明,方案仅用到两粒子纠缠态,没有涉及任何幺正操作,操作性强,密钥分发效率高。