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퍼지 시스템과 Particle Swarm Optimization(PSO)을 이용한 Prewarping 기술
장우석(Wooseok Jang),강환일(Hwanil Kang),이병희(Byunghee Lee) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2C
In this paper, we concentrate on the mask design problem for optical micro-lithography. The pre-distorted mask is obtained by minimizing the error between the designed output image and the projected output image. We use the particle swarm optimization(PSO) and fuzzy system to insure that the resulting images are identical to the desired image. Our method has good performance for the iteration number by an experiment.
특이치 분해와 Fuzzy C-Mean(FCM) 클러스터링을 이용한 벡터양자화에 기반한 워터마킹 방법
이병희(Byunghee Lee),강환일(Hwanil Kang),장우석(Wooseok Jang) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2D
In this paper, the one of image hide method for good compression ratio and satisfactory image quality of the cover image and the embedding image based on the singular value decomposition and the vector quantization using fuzzy c-mean clustering is introduced. Experimental result shows that the embedding image has invisibility and robustness to various serious attacks.
런지-커타 기법과 유전자 알고리즘을 이용한 제어기 설계 시스템의 구현
이충기(Chungki Lee),강환일(Hwanil Kang),유일규(Ilkyu Yu) 한국지능시스템학회 2003 한국지능시스템학회논문지 Vol.13 No.3
유전자 알고리즘은 생물의 유전적 진화과정을 이용한 새로운 문제 해결의 방안으로 결정론적 방법으로 해결하지 못한 난제에 적합한 알고리즘이다. 제어기 설계 기법은 주파수에 의존하는 명세에 의한 설계는 있어 왔으나 Manabe 표준형을 기본으로 사용하는 시간에 의존하는 명세를 만족시키는 제어기 설계 기법은 미미한 단계에 있다. 본 논문에서는 일반화된 Manabe 표준형을 이용하여 플랜트의 성능을 충족시키는 제어기의 설계에 관해 연구한다. 두 변수 구조를 갖는 제어시스템에서 제어기의 계수 설계시 역행렬 방법이나 기존의 의역 행렬 방법으로 해결할 수 없는 경우가 있다. 이 경우에 원하는 폐루프 다항식이 설계된 다항식과 같거나 근사적으로 같도록 새로운 의역 행렬 방법과 경사알고리즘을 이용하여 제어기를 설계하는 두 가지 방법을 제안한다. 다음으로 제안된 제어기 설계 방법들을 자바로 구현한다. Genetic algorithms using a process of genetic evolution of an organism are appropriate for hard problems that have not been solved by any deterministic method. Up to now, the controller design method has been made with the frequency dependent specification but the design method with the time specification has gotten little progress. In this paper, we study the controller design to satisfy the performance of a plant using the generalized Manabe standard form. When dealing with a controller design in the case of two parameter configurations, there are some situations that neither a known pseudo inverse technique nor the inverse method can be applicable. In this case, we propose two methods of designing a controller by the gradient algorithm and the new pseudo inverse method so that the desired closed polynomials are either equalized to or approximated to the designed polynomial. Design methods of the proposed controller are implemented in Java.
대공화기 명중률 향상을 위한 수학적 모델과 시뮬레이션 소프트웨어 개발
박우성(Woosung Park),박강(Kang Park),강환일(Hwanil Kang) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1
To enhance the hit-probability of anti-aircraft gun, an accurate and compact calculation of ballistic trajectory is required. There is trajectory calculation method called point mass analysis, which solves a 2nd order differential equation. In order to get its approximate solutions, numerical analysis that takes long time and many iterations is required. To overcome these defects, this paper proposes a new and compact method of trajectory calculation that uses the trajectory table with every 0.5° elevation step and the compensation table for distance error caused by range wind and cross wind. Those tables consists of coefficients of polynomial obtained by curve-fitting. The traverse and elevation angles can be found easily with few iteration by using the table. And to verify the accuracy of the proposed method the error between the approximate solution and the solution from the tables was analyzed.
전력전자상거래(VSEM)를 위한 웹기반 미터링/과금 시스템의 보안성 분석
송영기,강환일,장우석 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-
This paper focuses on the analysis for the security of web based metering system for VSEM(Value Storage Electricity Meter). We analyze security problem of existing system for authentication using smart cards for consumer, key value authentication, integrity and non-repudiation between the data of consumers and supplier in VSEM server. And we also propose the security model to solve the problem.
퍼지시스템과 유전자 알고리즘을 이용한 이족로봇의 계단보행을 위한 안정된 걸음걸이 설계
장우석,강환일 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-
In this paper, we generate a stable gait pattern of a biped robot using the fuzzy system and the genetic algorithm. The gait generation may be modeled using a fuzzy logic controller, whose rule base is optimized by genetic algorithm. Using the fuzzy system and the genetic algorithm, we obtain the optimal position of the robot's gait pattern and the optimal fuzzy rules.
퍼지 시스템과 Particle Swarm Optimization(PSO)을 이용한 Prewarping 기술
장우석,강환일 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-
In this paper, we concentrate on the mask design problem for optical micro-lithography. The pre-distorted mask is obtained by minimizing the error between the designed output image and the projected output image. We use the particle swarm optimization(PSO) and fuzzy system to insure that the resulting images are identical to the desired image. Our method has good performance for the iteration number by an experiment.