VR技术在指挥自动化中的应用

在介绍了虚拟现实技术的概念、组成、特点和指挥自动化系统的组成及其主要功能的基础上 ,提出了将虚拟现实的可视化技术应用到作战指挥控制系统中 ,建立分布式虚拟现实模拟系统 ,以增强战场的逼真性和系统的可视化程度 ,提高指挥员的决策性。     

A logistic regression/Markov chain model for NCAA basketball

Each year, more than $3 billion is wagered on the NCAA Division 1 men's basketball tournament. Most of that money is wagered in pools where the object is to correctly predict winners of each game, with emphasis on the last four teams remaining (the Final Four). In this paper, we present a combined logistic regression/Markov chain model for predicting the outcome of NCAA tournament games given only basic input data. Over the past 6 years, our model has been significantly more successful than the other common methods such as tournament seedings, the AP and ESPN/USA Today polls, the RPI, and the Sagarin and Massey ratings. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006.     

Reliability inference for field conditions from accelerated degradation testing

Accelerated degradation testing (ADT) is usually conducted under deterministic stresses such as constant‐stress, step‐stress, and cyclic‐stress. Based on ADT data, an ADT model is developed to predict reliability under normal (field) operating conditions. In engineering applications, the “standard” approach for reliability prediction assumes that the normal operating conditions are deterministic or simply uses the mean values of the stresses while ignoring their variability. Such an approach may lead to significant prediction errors. In this paper, we extend an ADT model obtained from constant‐stress ADT experiments to predict field reliability by considering the stress variations. A case study is provided to demonstrate the proposed statistical inference procedure. The accuracy of the procedure is verified by simulation using various distributions of field stresses. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006.     

Book Reviews

Strategic Views from the Second Tien The Nuclear Weapons Policies of France, Britain and China. Edited by J.C. Hopkins and W Hu, New Brunswick and London, Transaction Publishers, (1995) ISBN 1-56000-7907. $ 21.95

Multinational Military Forces: Problems and Prospects. By Roger H. Palin. Adelphi Paper 294, 11SS/Oxford University Press (1995) ISBN 0-19-828025-4 ISSN 0567 932X

South Africa in the Global Economy. Edited by Greg Mills, et al. South African Institute of International Affairs, Johannesburg, (1995) ISBN 1-874890-58-7. R. 45.60

The Limits of Air Powen The American Bombing of North Vietnam. By Mark Clodfelter, The Free Press. New York (1989). ISBN 0-02-905990-9. $22.95.

Guy Gibson. By Richard Morris with Colin Dobinson. Viking. London (1994). ISBN 0-670-82878-5. £18.00.

Dambuster: A Life of Guy Gibson VC. By Susan Ottway. Leo Cooper, London (1994). ISBN 0-85052-427. £16-95.     

幼儿教师与在园幼儿法律关系之法理重塑

幼儿教师与在园幼儿的法律关系分别在教育学理论和法学理论上存在诸多争议.这些争议虽然有益,但大都难以自圆其说.文章主张将幼儿教师与在园幼儿法律关系定性为施惠型社会行政法律关系,并在此基础上从法理、法律体系、法律关系内涵等角度进行理论重塑.     

高频雷达多波束最优天线方向图综合

在高频雷达中 ,多个部分重叠的波束被用来形成对预定空域的覆盖 ,而射频干扰和期望信号的空间结构之间的差异以及接收天线阵列的空间多样性则被用来抑制干扰以提高高频雷达的整体工作性能。然而如何在实时地形成多波束的同时有效地抑制射频干扰仍然是高频雷达一个急待解决的问题。基于最优天线方向图综合方法 ,通过主瓣形状保持和干扰抑制之间的合理折衷进一步提出了多波束形成算法。仿真结果表明该算法可以快速、灵活地形成多个波束来覆盖预定的空域 ,同时最大限度地抑制射频干扰 ,从而极大地提高了高频雷达的工作性能     

新疆旅游业发展的基本思路

通过对新疆旅游业现存问题和面临机遇的全面分析,提出了21世纪新疆地区旅游业发展的思路,应从加强旅游基础设施的建设,加大旅游业的宣传力度,强化旅游管理和积极开发旅游产品等方面着手,是新疆旅游业持续发展的保证.     

高温结构陶瓷精密磨削塑性变质层的物理模型

用透射电镜观察发现了磨削表面微晶和非晶层的过渡行为。采用物相分析和Ｘ射线衍射谱线分析证实了变质层中微晶的存在,通过能谱分析确定了非晶层的化学成分,应用硅酸盐物理化学中的相平衡理论,在对玻璃相结构进行量化分析的基础上,研究证实了Ａｌ２Ｏ３陶瓷表面变质层是由微晶和玻璃态化合物组成的塑性变质层。在此基础上,建立了陶瓷镜面磨削塑性变质层的物理模型,并用微刃切削理论解释了表面晶粒的碎化机理。     

Analysis of down times of jib cranes—A stochastic approach

In this paper a case study dealing with the maintenance problem of jib cranes is presented. A jib crane is viewed as a complex system whose performance is observed as a single realization over period of time. After pointing out limitations of existing stochastic models to analyze the observed realization a new family of bivariate stochastic processes is introduced. The data of jib crane is analyzed using new model and cross‐validated using part of the data set. It is noted that the new family of stochastic processes is useful to analyze bivariate data where one of the variables is finitely valued and the other is nonnegative and continuous. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 231–243, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/nav.10006