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Wenchao Zhang,Caigen Zhou,Xinxin Bao 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.2
With the continuous development of computer science and technology, image processing and analysis gradually form the scientific system. Although history of image processing is not long, it attracts many researchers study on it. Digital media image widely exists in many fields, such as education, video, advertisement, and so on. Process digital media image is an important part of image processing. When analyze the digital media image, we want to extract the image part we care from the original image and then method for image segmentation is quite important. That is to say that the image segmentation will divide the image into a number of regions with specific and unique nature. How to keep the original characteristics of the digital media image is quite important in the image segmentation. In this paper, we propose a new algorithm for digital media image segmentation, and it is also can be used in the image processing. The algorithm is based on asynchronous particle swarm optimization algorithm to obtain the adaptive threshold; take the inertia factor into the algorithm, the optimal threshold has been acquired for the image segmentation. Compared with other particle swarm optimization algorithm, the algorithm has the advantages of stable, easy to converge to the optimal solution, and high segmentation speed.
파라미터 최적화를 이용한 소형 헬리콥터 기본 설계 기법 연구┼
황경정,권정호,Caigen,Guo 울산대학교 1999 공학연구논문집 Vol.30 No.2
헬리콥터 설계 과정에서 초기 외형 형상 및 치수 결정을 위한 적절한 기본 설계 변수값들의 결정 여부는 설계의 성패를 좌우한다. 그러나 이러한 기본 설계 변수들은 보통 변수 상호간 서로 상반되게 비행 성능에 영향을 주므로 설계 목적에 부합되는 최적의 설계 변수값을 결정하기가 쉽지 않다. 본 연구에서는 소형 헬리콥터의 주요 성능 분석 모델과 최적화 기법을 통하여 기본 설계 변수를 결정하는 과정을 고찰하였다. 그리고 유사 기종에 대한 실제 설계 데이터와 남경항공항천대학이 보유하고 있는 최적화 전산 프로그램을 활용하여 주어진 설계 요구 성능의 헬리콥터에 대한 기본 설계 변수값을 계산하고 외형 설계를 수행하였다. A preliminary design method for multipurpose small helicopter using parameter optimization, was studied. The analytical models of design optimization was reviewed in terms of flight performances according to the design requirements. The computations of real preliminary design parameters were carried out in virtue of the in-house computer program for optimal design at NUAA and the determination of helicopter configuration and sizing was also performed in accordance with calculated results.
Impulsive Output Consensus of Networked Passive Systems
Haibo Jiang,Liping Zhang,Jianjiang Yu,Caigen Zhou 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.6
In this paper, we study the problem of impulsive output consensus of multi-agent dynamical systems, where each agent is a passive system. Firstly, an impulsive control protocol is designed for networked passive systems based on the local information of agents. Secondly, sufficient conditions are derived to guarantee the output consensus of the multi-agent dynamical systems for the network with fixed and switching topologies, respectively. Finally numerical simulations are included to show the effectiveness of our theoretical results.
Consensus of Multi-agent Systems with Dead-zone Nonlinearity
Haibo Jiang,Liping Zhang,Jianjiang Yu,Caigen Zhou 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.4
In this paper, we investigate the consensus problem of multi-agent systems with dead-zone nonlinearity over undirected networks. Firstly, a control protocol is designed based on the local infor-mation of agents. Then by LaSalle’s invariance principle for non-smooth systems, we prove that if the undirected graph is connected then the consensus is achieved by the proposed control protocol. Sec-ondly, sufficient conditions are given to guarantee the consensus of multi-agent systems with dead-zone nonlinearity and switching topologies by Lyapunov method. Finally, numerical simulations show the effectiveness of our theoretical results.