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Optimal two-impulse space interception with multiple constraints Research Articles

Li Xie, Yi-qun Zhang, Jun-yan Xu,lixie@ncepu.edu.cn,yiqunzhang@hotmail.com,junyan_Xu@sina.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 7, Pages 963-1118 doi: 10.1631/FITEE.1800763

Abstract: We consider optimal two-impulse with . The are imposed on the terminal position of a space interceptor, impulse and impact instants, and the component-wise magnitudes of velocity impulses. These optimization problems are formulated as and solved by the calculus of variations. Slackness variable methods are used to convert all inequality constraints into equality constraints so that the Lagrange multiplier method can be used. A new is presented. As a result, an indirect optimization method is developed. Subsequently, our method is used to solve the two-impulse of free-flight ballistic missiles. A number of conclusions for have been drawn based on highly accurate numerical solutions. Specifically, by numerical examples, we show that when time and velocity impulse constraints are imposed, optimal two-impulse solutions may occur; if two-impulse instants are free, then a two-impulse space interception problem with velocity impulse constraints may degenerate to a one-impulse case.

Keywords：空间拦截问题；变分法；多约束；两速度脉冲；多点边值问题；局部最优解；动态松弛变量法

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Discuss of several basic problems in the GIS spatial relationship description

Deng Min,Li Chengming,Liu Xiaoli

Strategic Study of CAE 2013, Volume 15, Issue 5, Pages 20-24

Abstract:

Firstly,it analyzed the concept of space, and then discussed the characters of topological relationship unrelated with entities. Secondly, it proposed the topological representation of entities and its shortage. Lastly, the method considered the metric characters was suggested.

Keywords： space topological relationship representation of spatial relations

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Cyberspace Endogenous Safety and Security Article

Jiangxing Wu

Engineering 2022, Volume 15, Issue 8, Pages 179-185 doi: 10.1016/j.eng.2021.05.015

Abstract:

Uncertain security threats caused by vulnerabilities and backdoors are the most serious and difficult problem in cyberspace. This paper analyzes the philosophical and technical causes of the existence of so-called “dark functions” such as system vulnerabilities and backdoors, and points out that endogenous security problems cannot be completely eliminated at the theoretical and engineering levels; rather, it is necessary to develop or utilize the endogenous security functions of the system architecture itself. In addition, this paper gives a definition for and lists the main technical characteristics of endogenous safety and security in cyberspace, introduces endogenous security mechanisms and characteristics based on dynamic heterogeneous redundancy (DHR) architecture, and describes the theoretical implications of a coding channel based on DHR.

Keywords： Cyberspace endogenous security problem Uncertain threat Cyberspace endogenous safety and security Relative right axiom Dynamic heterogeneous redundant architecture

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Space contracting and decomposing algorithm based on Backbone

Gao Yongchao,Qian Heng,Liu Limei,Wang Yunzheng,Wang Ding

Strategic Study of CAE 2009, Volume 11, Issue 9, Pages 74-77

Abstract:

The scale and complexity of search space are important factors to decide the solving difficulty of an optimization problem. The information of solution space may lead searching to optimal solutions. Based on the known space structure of job shop scheduling problem, a space contracting and decomposing algorithm is proposed. This algorithm makes use of the good solutions found by searching algorithms, contracts the search space and decomposes it into one or several optimal regions combined with the concept of Backbone of combinatorial optimization solutions. And optimization of small-scale problems is carried out in optimal regions. Statistical analysis is not necessary before or through solving in this algorithm, and solution information is used to estimate the landscape of search space, which enhances the speed and solution quality. The experiments results testify the efficiency of this new algorithm.

Keywords： job shop scheduling problem solution space Backbone

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The countermeasures of reducing and preventing disasters and “remaining space for energy”

Chen Gangyi,Lu Yajun

Strategic Study of CAE 2011, Volume 13, Issue 3, Pages 92-96

Abstract:

Based on the theory of stir kinetic energy conversation law proposed by Ouyang Shoucheng, which revealed that energy can not break away from matter and space should be remained for energy, the relationships of energy space and natural disaster and catastrophic dynamics were discussed. The application and countermeasures of energy space in reconstruction after disaster, plan of flood control and disaster reduction, ecological environmental plan and etc. were proposed. It was emphasized that natural disasters and artificial construction project should remain space for energy for effective disaster reduction and prevention. It was suggested that "remaining space for energy" is the new scientific proposition aim at the modern science's omission.

Keywords： stir kinetic energy energy space disaster prevention and reduction reconstruction after disaster

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Subspace-based identification of discrete time-delay system Article

Qiang LIU,Jia-chen MA

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 6, Pages 566-575 doi: 10.1631/FITEE.1500358

Abstract: We investigate the identification problems of a class of linear stochastic time-delay systems with unknown delayed states in this study. A time-delay system is expressed as a delay differential equation with a single delay in the state vector. We first derive an equivalent linear time-invariant (LTI) system for the time-delay system using a state augmentation technique. Then a conventional subspace identification method is used to estimate augmented system matrices and Kalman state sequences up to a similarity transformation. To obtain a state-space model for the time-delay system, an alternate convex search (ACS) algorithm is presented to find a similarity transformation that takes the identified augmented system back to a form so that the time-delay system can be recovered. Finally, we reconstruct the Kalman state sequences based on the similarity transformation. The time-delay system matrices under the same state-space basis can be recovered from the Kalman state sequences and input-output data by solving two least squares problems. Numerical examples are to show the effectiveness of the proposed method.

Keywords： Identification problems Time-delay systems Subspace identification method Alternate convex search Least squares

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Simulation on Hitting Probability of MMW Remote ControllingTrajectory Correction Munition Intercepting Mobile Anti-ship Missile

Hu Ronglin,Li Xingguo

Strategic Study of CAE 2007, Volume 9, Issue 10, Pages 65-70

Abstract:

The basic principle of millimeter wave remote controlling munitions (MMW-RCTCM) is demonstrated in the introduction. Then the concept of correctable intercepting flow is proposed. And the anti-air shooting model of millimeter wave remote controlling munitions (MMW-RCTCM) intercepting mobile anti-ship missile (MACM) is established in section 2 and 3. Subsequently, the hitting probability of single MMW-RCTCM vs. single MACM as well as MMW-RCTCM flow vs. single MACM and MMW-RCTCM flow vs. MACM flow are analyzedin detail. The probabilities of the above are simulated based on the parameters of the two sides of attacking and intercepting in the 5th section. It is illustrated that comparing with the non-controlling munitions, the efficiency of MMW-RCTCM is increased remarkably. At the last, it is concluded that the MMW-RCTCM can resist the attacking of saturate flow; ultra-sonic MACM.

Keywords： MMW remote controlling trajectory correction munitions correctable intercepting flow anti-ship missile hitting probability

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Exploration and research of space physics and space weather

Wang Chi

Strategic Study of CAE 2008, Volume 10, Issue 6, Pages 41-45

Abstract:

Space physics is a fast-growing cross-discipline science with the advance of satellite technology since 1957. Space environment is becoming more and more important as the fourth living environment for human being. Starting from the early 1990s, space weather is born by applying the fundamentals of space physics to applications. The space weather study is aimed to investigate and alleviate the disaster effects of solar activity on our high-tech systems on the earth and in space. This report gives a brief summary of the history, current status and future direction of the international space physics and space weather exploration and study, and introduces the suggested space physics and space weather mid-long term development strategic plan and exploration roadmap.

Keywords： space physics space weather space physics exploration strategic plan

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Study on Strategies for Developing Offshore as the New Spaces for Mariculture in China

Mai Kangsen,Xu Hao,Xue Changhu,Gu Weidong,Zhang Wenbing,Li Zhaojie and Yu Bo

Strategic Study of CAE 2016, Volume 18, Issue 3, Pages 90-95 doi: 10.15302/J-SSCAE-2016.03.015

Abstract:

Mariculture industry, makes great contribution to national food security, economy and trade balance. To realize sustainable development of mariculture in China in the new period, it is urgent to exploit new space and develop offshore aquaculture strategy. Offshore aquaculture is an integrated system including suitable species, culture techniques, culture equipments, energy supply, sea-land relay logistics, aquatic products processing, and strategies of disaster prevention and reduction. On the basis of a strategic concept of the new space for mariculture in China, the present study puts forward strategic missions on the development of offshore mariculture. The missions include building a suitable species breeding and efficient farming technology system, constructing a new type of marine fisheries production mode with the core of offshore aquaculture platform, building an energy security system, and constructing an intelligent mariculture products logistics network. Based on these strategies, relevant policy suggestions are also suggested.

Keywords： offshore aquaculture new space problem analysis strategic mission policy suggestion

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Coordinated Development of Space Science, Space Technology, and Space Application in China

Zhou Jianping, Wu Ji

Strategic Study of CAE 2023, Volume 25, Issue 2, Pages 59-66 doi: 10.15302/J-SSCAE-2023.02.007

Abstract:

Owing to historical reasons and investment restrictions, China’s aerospace industry initially focused on space technology and application, with insufficient emphasis on space science; therefore, space science, technology, and application developed independently. The development of space technology should be deeply integrated into space science and application, thus to strengthen China’s aerospace industry and create new opportunities and achievements. This study explores the implications of space science, space technology, and space application and clarifies their interrelationships. Moreover, it systematically analyzes the development trend in space science, technology, and application worldwide and reviews the development situation of space-related fields in China. Based on this, it examines the necessity for coordinating the development of space science, technology, and application in China and summarizes the major challenges. Considering their overlapping needs and mutual promotion, space science, technology, and application should be coordinated throughout the process of planning, deployment, and implementation. First, the advantages of the new national system should be exploited to conduct top-level planning under unified management. Second, the innovation-driven development strategy should be insisted to promote the international competitiveness of China’s aerospace industry through technological progress. Third, basic research in the space field should be strengthened and high-level scientists and engineers should be cultivated. Lastly, resource planning and coordination should be strengthened to promote the rational opening and full utilization of space application data.

Keywords： aerospace industry space science space technology space application coordinated development sharing of space data

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Several Strategic Issues for the Construction of Ecological Civilization in Yangtze River Economic Belt

Hao Jiming, Wang Jinnan, Zhang Shougong, Wu Fengchang, Jiang Hongqiang, Wu Wenjun, Chen Lyujun, Zhang Linbo, Liu Nianlei

Strategic Study of CAE 2022, Volume 24, Issue 1, Pages 141-147 doi: 10.15302/J-SSCAE-2022.01.015

Abstract:

To promote the construction of ecological civilization in the Yangtze River Economic Belt, the Chinese Academy of Engineering launched a major consulting project in 2019 titled “Study on Several Strategic Issues for the Construction of Ecological Civilization in Yangtze River Economic Belt”. Based on the results of the project, this paper summarizes the achievements of ecological civilization construction in Yangtze River Economic Belt in terms of top-level design, green demonstration, ecological protection, and environmental improvement, and then analyzes its main challenges regarding territorial development, industrial layout, river–lake relationship, ecological security, energy development, and environmental risks. Based on the concept of a life community of mountains,rivers, forests, farmland, lakes, grass, and sand, we propose several strategic suggestions focusing on ecological space management and control, water ecosystem health, green and high-quality development, ecological protection and restoration, ecological agriculture and forestry development, ecological product value realization, and ecolog¬ical civilization governance system.

Keywords： Yangtze River Economic Belt，ecological civilization，ecological space，environmental quality，strategic issue

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Waves of Probability and the Problems of Torsion for Quantum Effect

OuYang Shoucheng,Li Zhilan,Yuan Dongsheng

Strategic Study of CAE 2005, Volume 7, Issue 6, Pages 1-6

Abstract:

In this paper, the numerical experiment is conducted for Schrödinger's equivalent equation with third order derivative for nonlinear variable. The results show that the probability of probability waves is the quasi-regular flow under given condition, and it's a result of comprehensive interactions among intensity of potential field and particle density and torsion (spin) field with the quantum effect. The pure quantum effect is represented only by irregular flow.

Keywords： torsion (spin) probability quantum effect nonlinear instability curvature space

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Zoning of Agricultural Resource and Environment in China

Erqi Xu

Strategic Study of CAE 2018, Volume 20, Issue 5, Pages 57-62 doi: 10.15302/J-SSCAE-2018.05.009

Abstract:

Problems in China’s agricultural resources and environment have become increasingly prominent, with distinct resource and environment constraints for regional agricultures. Based on regional differentiation in agricultural resource and environment characteristics, this paper divided the country into 10 first-level zones and 57 second-level zones at the county scale. The first-level zones were divided according to regional differentiation in climate and geotectonic. And the second-level zones differentiate in water resources, land resources, and environmental conditions. It analyzed the agricultural production conditions, types of resources and their different combinations, environmental production conditions, and existing problems in these zones. This study proposed the strategies of “optimizing the spatial layout of eastern, central, and western regions” and “improving Northeast China, regulating North China, and recovering South China”. Twenty-seven second-level zones, undertaking the supply of major agricultural products in China, were identified and labeled as “major agricultural developing regions in China”. The development direction and construction measures of the major agricultural developing regions in China were suggested to maintain and improve the health and sustainability of China’s agricultural production system.

Keywords：一级区依据气候条件和大地构造的地域分异，二级区根据水资源、土地资源和环境条件问题差异。分析了全国各分区农业生产条件、资源类型及其组合的特点、环境生产条件和存在问题，提出中国农业资源环境问题日益突出，区域农业资源限制因素和环境制约问题各不相同。

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Research on Cyberspace Sovereignty

Fang Binxing,Zou Peng and Zhu Shibing

Strategic Study of CAE 2016, Volume 18, Issue 6, Pages 1-7 doi: 10.15302/J-SSCAE-2016.06.001

Abstract:

Cyberspace sovereignty (referred to here by its short form, cyber sovereignty) is the extension of national sovereignty to the platform of information and communication technology systems. This article defines cyberspace and cyber sovereignty, discusses the existence of cyber sovereignty, and judges several erroneous points of view that deny cyber sovereignty.

Keywords： cyberspace cyberspace sovereignty stakeholder

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Research on the International Strategy for National Cyberspace Security

Fang Binxing,Du Aning and Zhang Xi,Wang Zhongru

Strategic Study of CAE 2016, Volume 18, Issue 6, Pages 13-16 doi: 10.15302/J-SSCAE-2016.06.003

Abstract:

Cyberspace security has been a crucial part in national security and is more and more important in the development of economy and society. Based on the current situation of international cyberspace security, this article analyzes the opportunities and challenges that China is confronted with, and study China's international cyberspace security strategy suitable for its own value and national interest. We then propose the objectives, principles and tasks of the strategy.

Keywords： cyberspace security cyberspace governance cyberspace strategy