威胁联网下低空突防航路规划研究

分析了威胁联网下信息交流和资源共享对飞行航路规划的影响;针对威胁联网,制定相关的威胁体相互支援表,采用遗传算法进行低空突防航路规划.通过仿真计算证明,此方法规划出的飞行航路能有效提高威胁联网下的战斗机低空突防安全性,为航路规划提供了一种新思路.     

An INS/GNSS integrated navigation in GNSS denied environment using recurrent neural network

In view of the failure of GNSS signals, this paper proposes an INS/GNSS integrated navigation method based on the recurrent neural network (RNN). This proposed method utilizes the calculation principle of INS and the memory function of the RNN to estimate the errors of the INS, thereby obtaining a continuous, reliable and high-precision navigation solution. The performance of the proposed method is firstly demonstrated using an INS/GNSS simulation environment. Subsequently, an experimental test on boat is also conducted to validate the performance of the method. The results show a promising application prospect for RNN in the field of positioning for INS/GNSS integrated navigation in the absence of GNSS signal, as it outperforms extreme learning machine (ELM) and EKF by approximately 30% and 60%, respectively.     

飞机再次出动保障活动设计方法

飞机再次出动保障活动所需时间长短对提升飞机的作战效能至关重要,针对当前在飞机保障资源有限约束条件下,再次出动保障活动工期最短难以实现的难题,提出了基于分支切割法的再次出动保障活动时间优化方法。该方法以飞机再次出动保障活动所需时间最短为目标,以有限的保障人员和保障作业间逻辑关系为约束条件,可计算出时间最短的飞机再次出动保障活动具体流程,并用VB6.0编制成计算机程序,开发了飞机再次出动保障活动分析系统。最后,对某型飞机真实保障活动进行了实例分析,结果表明,使用该方法计算得到的结果准确、可靠,与实际保障情况相符,可为飞机再次出动保障与决策提供指导,提升保障活动的自动化水平,具有很好的工程应用价值。     

美国国防部后勤转型

简要介绍了美军后勤的定义与管理构架，分析了美国国防部（DoD）后勤转型的背景和实施过程，研究了DOD后勤转型的特点，并结合军队后勤体制变革总结几点启示。     

Experimental investigation on dynamic response and damage models of circular RC columns subjected to underwater explosions

Reinforced concrete (RC) columns are widely used as supporting structures for high-piled wharfs. The study of damage model of a RC column due to underwater explosion is a critical issue to assess the wharf’s antiknock security. In this study, the dynamic response and damage model of circular RC columns subjected to underwater explosions were investigated by means of scaled-down experiment models. Experiments were carried out in a 10.0 m diameter tank with the water depth of 2.25 m, under different explosive quantities (0.025 kg–1.6 kg), stand-off distances (0.0 m–7.0 m), and detonation depths (0.25 m–2.0 m). The shock wave load and dynamic response of experiment models were measured by configuring sensors of pressure, acceleration, strain, and displacement. Then, the load distribution characteristics, time history of test data, and damage models related to present conditions were obtained and discussed. Three damage models, including bending failure, bending-shear failure and punching failure, were identified. In addition, the experience model of shock wave loads on the surface of a RC column was proposed for engineering application.     

Trilateral defence cooperation in the North: an assessment of interoperability between Norway,Sweden and Finland

Norway, Sweden and Finland have proclaimed a willingness to cooperate militarily in a future crisis or conflict despite their diverging alliance affiliation. This article assesses their ability to do so through various elements affecting their interoperability, with Arctic Challenge, a multinational military exercise, as an empirical basis. The analysis finds that the NATO/non-NATO-divide has a negative impact on the trilateral defence cooperation, especially on exchange of information and aspects related to command and control. At the same time, Finland and Sweden have become largely NATO-standardized through their active partnership with the Alliance. This has affected interoperability aspects, such as communication, culture, and the compatibility of technical solutions, in a positive manner. Through agreements with the Alliance, as well as domestic legal changes, the two NATO-partners have facilitated receiving military assistance from Norway and other NATO-members during a crisis. Other agreements between the Nordic countries, however, have been limited to peacetime.     

基于FPGA的可变速率PSK数字解调器实现

针对QPSK变速率调制数字系统,提出了一种新的基于现场可编程门阵列(FPGA)实现方法,该系统可以支持4.88 Kb/s到2 Mb/s和更高的连续比特速率。设计采用混合乘法器、数控振荡器(NCO)和积分-梳状滤波器(CIC),并给出了系统中载波和信号恢复电路的设计结构,且可以移植到任何FPGA器件。提出的设计在Xilinx Virtex-5 FPGA平台进行了硬件测试。硬件实现结果显示,采用本方法实现的解调器,表现出优越的使用效率。     

Does Military Spending Nonlinearly Affect Economic Growth in South Africa?

Using annual data collected from 1988 to 2015, this study provides evidence of a non-linear relationship between military spending, economic growth and other growth determinants for the South African economy. The empirical study is based on estimates of a logistic smooth transition regression (LSTR) model and our empirical results point to an inverted U-shaped relationship between military spending and economic growth for the data. Furthermore, our empirical results suggest that the current levels of military spending, as a component of total government expenditure, are too high in the South African economy and need to be transferred towards more productive non-military expenditure in order to improve the performance of economic growth and other growth determinants.