伊拉克战争对中东地区乃至世界军品贸易的影响

在分析了伊拉克战争对中东地区军品贸易影响的基础上,重点分析了其对世界军品贸易的深刻影响———加剧军备竞赛、刺激军工技术发展、引起军贸格局及产品结构发生变化、国际军控形势更加严峻。     

卫星导航接收机鉴相器有限字长效应研究

卫星导航接收机跟踪信号的能力取决于锁相环的跟踪精度,相位鉴别器在锁相环设计中具有重要地位。针对点积鉴相器和二象限反正切鉴相器在输入信号有限字长效应下,对鉴相器性能的影响问题,建立了鉴相器有限字长误差模型。通过理论推导输入信号的统计特性,计算得到鉴相器输入信号均值和方差表达式,并分析了有限字长对鉴相器的均值和方差、收敛区间和鉴别增益的影响情况。由理论和仿真验证,得出了鉴相器在输入信号有效位数3比特以上时,对环路跟踪精度没有影响的结论。     

NATO BENEFITS,BURDENS AND BORDERS: REPLY

This note implements the sensitivity analysis suggested by Sandler and re‐examines the robustness of the concordance between NATO benefits and burdens.     

NATO BENEFITS,BURDENS AND BORDERS: COMMENT

This note refutes criticism raised by Solomon about past tests used to ascertain the concordance between NATO benefits and burdens. In so doing, a case is made for keeping the benefit proxy based on exposed borders. Moreover, a truer sensitivity analysis than that offered by Solomon is suggested.     

Joint pricing,assortment, and inventory decisions for a retailer's product line

Consider a set of product variants that are differentiated by some secondary attributes such as flavor, color, or size. The retailer's problem is to jointly determine the set of variants to include in her product line (“assortment”), together with their prices and inventory levels, so as to maximize her expected profit. We model the consumer choice process using a multinomial logit choice model and consider a newsvendor type inventory setting. We derive the structure of the optimal assortment for some important special cases, including the case of horizontally differentiated items, and propose a dominance relationship for the general case that simplifies the search for an optimal assortment. We also discuss structural properties of the optimal prices. Finally, motivated by our analytical results, we propose a heuristic solution procedure, which is shown to be quite effective through a numerical study. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007