民机CNS系统动态重构技术

动态重构是一项充分利用软硬件资源的技术。在介绍民机CNS系统和动态重构基本原理基础上,给出了一种动态重构的通用功能模块的设计方案,描述了利用有限状态机和排列组合原理计算系统配置的方法,并根据系统资源状况和应用的优先级对资源进行初次分配及再分配,设计出了一种动态重构算法,该算法能很好地兼顾资源备份式重构和资源抢占式重构。同时,指出对动态重构的品质设计需从可用性、可靠性、维护性方面考虑。最后,使用Simulink对动态重构算法的正确性进行了仿真验证。     

不停航施工机位限制运行分析

对不停航施工期间停机位的限制运行问题进行研究.从机位分配、地面滑行、服务保障以及大小机位类型配比的角度出发,分析不停航施工对这些环节可能造成的影响或限制,并根据这些影响因素提出不停航施工下机位限制运行策略;然后结合某机场不停航施工的相关情况,给出该条件下的机位限制运行的所需满足的要求,期望通过此举给今后不停航施工的机场提供相关的机位运行参考.     

Drivers of food price in China: A heterogeneous panel SVAR approach

In this paper, we examine the effects of shocks in agricultural output, production material price and production price on China's food price using panel data of 26 provinces for the period 2004 Q1–2015 Q4. Employing a heterogeneous panel structural vector autoregressive (SVAR) model, we identify the causal flows between the endogenous variables via directed acyclic graphs method. The empirical results from impulse response functions and variance decompositions suggest sizeable cross‐province variations. The main driving force of food price is the price inertia shock, rather than the agricultural output or the vertical chain of price transmission shocks. The findings support the view that price expectation is the key shifter of food price. Moreover, the shocks in the vertical chain of price transmission are only weakly linked to food price. Our findings are robust to an alternative panel SVAR model identified via Cholesky decomposition.     

异构蜂窝网络中用户关联与基站功率的协同优化

为实现异构蜂窝网络中宏基站和小基站之间的负载均衡,提出了一种基于效用函数最大化模型的用户关联机制和基站功率控制的协同优化方案。通过迭代算法求解该协同优化问题,首先在基站功率固定的情况下求得最佳用户关联策略,然后在所得的用户关联策略基础上通过Zoutendijk可行方向法求得基站最佳功率。通过协同优化获得的用户关联策略和基站功率控制实现了基站之间的负载均衡,通过降低宏基站功率和关闭闲置小基站降低了基站的能耗。仿真实验表明,所提方案和不实施功率控制的用户关联策略相比,实现了宏基站与小基站之间的负载均衡,降低了宏基站对小基站用户的干扰,提升了小基站用户的信号干扰噪声比,用户速率中位值提高了20%。     

民机CNS系统适航验证方法分析与实践

适航是我国民机CNS（Communication,Navigation and Surveillance）系统发展的关键。以适航为目标,首先分析并确定了CNS系统验证的需求,然后通过分析适航标准提出了满足适航要求的CNS系统验证方法,即按照验证方法、验证级别、测试环境方案以及验证实施追溯过程为线进行验证分析。该方法还可适用于民机其他航电系统。     

飞行器射频隐身技术及发展思路

射频隐身是武器平台对抗无源探测设备的重要技术手段,与雷达、红外隐身一起构成 作战平台的隐身能力。飞行器射频隐身性能是其作战能力和生存能力达成的重要因素。在对 飞行器典型有源传感器的使用和面临的威胁分析基础上,分析了飞行器射频隐身主要技术手 段,概括了飞行器射频隐身主要技术特点,提出了飞行器射频隐身技术的发展思路。     

Industry concentration and optimal discriminatory commercial policies

We derive the characteristics of firm-specific strategic trade policies when industries consist of heterogenous firms, and show how the informational requirements for policy design are thereby expanded. A knowledge of the Herfindahl index of concentration of the foreign industry is required for the design of optimal protection for domestic firms. It is shown that optimal firm-specific tariffs reduce the degree of foreign concentration, thus shifting rents to domestic firms.     

An analysis of the current backlash of economic globalization in a model with heterogeneous agents

This paper analyzes the current phase of backlash of economic globalization using a target zone approach in an environment populated by heterogeneous agents. The target zone analysis suggests that there may be a positive expectation effect (a ‘honeymoon’) when the social costs are credibly expected to remain below the benefits arising from globalization. In such a situation, the latter proceeds even beyond the level that society would be willing to accept in the absence of a such a target. When the costs are expected to exceed the benefits, instead, the opposite phenomenon (a ‘divorce’) arises. While in the case of exchange rates or interest rates, the passage from ‘honeymoon’ to ‘divorce’ might well occur with a discrete jump of the respective variable, rather than gradually, this is not the case when considering economic and social costs. Graduality is obtained thanks to the introduction of the hypothesis of heterogeneous agents. The proportion of those who think that the costs of globalization exceed the benefits increases with globalization and the ‘honeymoon’’, then, gradually turns into a ‘divorce’. Government's redistributive intervention to compensate the losers, however, could reduce the costs of globalization, thereby delaying or even preventing its crisis.     

Incomplete Exchange Rate Pass-Through: Evidence from Exchange Rate Reform in China

Exchange rate disconnect is one of the central puzzles in international macroeconomics. Recently, there is a growing literature that studies the microeconomic foundations or mechanisms for incomplete exchange rate pass-through. However, the estimations of the exchange rate pass-through vary widely in the existing literature. Our article proposes the use of a policy-based instrumental variable for exchange rate, exploiting the exchange rate reform in China, and finds that 67% of exchange rate pass-through into the FOB export price of Chinese exports. This contrasts to the almost full exchange rate pass-through using OLS estimation. We further find that the export price of homogeneous goods, low-technology goods, and goods supplied by domestic non-SOEs is more sensitive to exchange rate changes.     

Disagreement and equilibrium option trading volume

Using a complete market equilibrium model, we present results concerning the effect disagreement has on equilibrium option trading volume and positioning. We find that if agents agree on volatility, total option volume is independent of wealth distribution and average optimism. We also find option volume increasing in drift disagreement and decreasing in risk aversion and volatility. Pessimists are shown to write most options. With volatility disagreement, the results are less clear; however, we show agents with high volatility beliefs write deep out of the money options and buy close to the money options. Numerical comparative statics are also performed. This revised version was published online in June 2006 with corrections to the Cover Date.