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High-resolution forward-looking imaging algorithm for missile-borne detectors

Journal of Systems Engineering and Electronics 2019年第3期30卷 456-466页

作者： CHENG Cheng GAO Min ZHOU Xiaodong Department of Missile Engineering Army Engineering University Shijiazhuang 050003 China Department of Ammunition Engineering Army Engineering University Shijiazhuang 050003 China

Aiming at a novel missile-borne detector in the optional burst height proximity fuze, a self-adaptive high-resolution forward-looking imaging algorithm (SAHRFL-IA) is presented. The echo data are captured by the missile-borne detector in the target regions;thereby the azimuth angulation accuracy at the same distance dimension is improved dynamically. Thus, azimuth information of the targets in the detection area may be obtained accurately. The proposed imaging algorithm breaks through the conventional misconception of merely using azimuth discrimination curves under ideal conditions during monopulse angulation. The real-time echo data from the target region are used to perform error correction for this discrimination curve, and finally the accuracy of the azimuth angulation may reach the optimum at the same distance dimension. A series of experiments demonstrate the validity, reliability and high performance of the proposed imaging algorithm. Azimuth angulation accuracy may reach ten times that of the detection beam width. Meanwhile, the running time of this algorithm satisfies the requirements of missile-borne platforms.

关键词： forward-looking imaging high-resolution missileborne detector self-adaptive radio proximity fuze

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New Keynesian Model and Inflation Prediction

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Chinese Business Review 2013年第1期12卷 34-40页

作者： Yutaka Kurihara

Recently, much dispute has occurred about the validity of the New Keynesian model from both theoretical and empirical views. However, a few studies have analyzed this model from the empirical perspective. Few other studies have analyzed this model directly or nearly directly. This article empirically examines the New Keynesian model focusing on inflation forecast. Generalized method of moments （GMM） is used to examine whether the typical Keynesian model with Taylor rule is empirically appropriate for the US, UK, Euro area, and Japan. The results showed：（1） the New Keynesian model fits well in most cases and explains the real economy well. Taylor rule also fits well for most cases; （2） Rational expectations for inflation rates may not be useful based on this model When AR （1）（time series analysis） model is used to capture inflation expectations instead of one-time ahead real values, the model fits well. With measured expectations, the relative weight of the forward-looking terms increase on the cost of lagged inflation and output terms, even up to the point at which the lagged inflation terms are no longer needed to rescue the new Keynesian model; and （3） forward-looking variables play more important roles than backward-looking ones in economic activity. Results with expectations with forward-looking terms perform better in general. This New Keynesian model may reduce the importance of lagged output in some cases

关键词： expectation forward-looking inflation New Keynesian output Taylor rule

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中国行业尾部风险的测度、预警和传染效应

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统计与精算 2024年第5期

作者：李政李丽雯贾妍妍武坤

本文构建了左尾和右尾β系数，分别对中国行业尾部风险进行监测和预警研究，并进一步基于尾部风险网络，考察不同市场状态下行业间的风险传染效应。研究发现，第一，空间维度上，行业尾部系统风险的高低主要取决于个体尾部风险；时间维... 详细信息

本文构建了左尾和右尾β系数，分别对中国行业尾部风险进行监测和预警研究，并进一步基于尾部风险网络，考察不同市场状态下行业间的风险传染效应。研究发现，第一，空间维度上，行业尾部系统风险的高低主要取决于个体尾部风险；时间维度上，右尾系统风险的前瞻性来源于个体右尾风险。第二，绝大多数行业在市场极端下跌状态下的尾部风险更高，但金融在市场极端上涨状态下的尾部风险更高。第三，工业、可选消费和房地产的左尾系统风险方向性溢出水平明显高于右尾，但能源和金融的右尾系统风险溢出，以及能源和原材料的右尾系统风险溢入均显著高于左尾。本文可为防范化解行业尾部风险、维护国家经济金融安全提供指导。

关键词：左尾系统风险右尾系统风险风险分解前瞻性风险传染 systematic right-tail risk systematic left-tail risk risk decomposition forward-looking risk contagion

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