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초정밀 가공기를 이용한 적외선 우주망원경용 렌즈의 절삭가공기술개발
양순철,김동락,남욱원,김건희,유종신,김효식,신현수,홍권희,박수종 한국기계가공학회 2005 한국기계가공학회지 Vol.4 No.2
Machining technique for optical crystals with single point diamond turning tool is reported in this paper. The main factors influencing the machined surface quality are stu야ed and regularities of machining process are drawn. Optical crystals have been known to more and more important applications in the field of modern optics. Ge is more brittle material of poor machinability. The traditional machining method is polishing which has many shortcomings such as low production efficiency, poor ability to be automatically controlled and edge effect of the workpiece. The purpose of our research is to find the optimum machining conditions for ductile cutting of Ge and apply the SPDTM technique to the manufacturing of ultra precision optical components of Ge. As a result, the surface roughness is the best when cutting speed is 180m/min, feed rate is 2㎜/min, depth of cut is 0.5㎛ and nose radius of tool is 0.8㎜.
양순철 한국광학회 1993 한국광학회지 Vol.4 No.3
도파로의 전자기장을 Bessel함수와 삼각함수로 급수전개하고 코어와 클래드간의 경계면에서 유한한 갯수의 점들을 선택하여 각 점에 전자기장의 경계조건을 적용함으로서 반원형 단면을 갖는 광도파로의 벡터해를 구하였다. 그리고 각 고유모우드들의 전파상수와 에너지 분포를 구하여 그 특성을 토의하였다. -H가 E로 바꾸어지는 것을 제외하고는 odd인 모우드와 거의 같았으며, 코어와 클래드의 굴절률 비가 1로 접근함에 따라서 even과 odd 모우드는 서로 축최됨을 볼 수 있었다. We find the vectorial solution of the optical waveguide with semicircular cross-section by expanding the electromagnetic fields of the waveguide into the series of trigonometric and Bessel funtions and by applying the boundary conditions at the finitely selected points on the interface of the core and the cladding. We find also the propagation constants and the energy distributions of the eigenmodes and discuss its properties. As a result of computation, we find that the electromagnetic fields of the even modes about the symmetric axis of the semircular shape are nearly the same as those of the odd modes except that E and H of the odd modes are replaced by -H and E and that the even and odd modes are degenerated as the ratio of refractive index of the core and cladding approaches to 1.
HERMITE-GAUSS 함수들을 이용한 광도파로의 SCALAR 변분해석
양순철 木浦大學校基礎科學硏究所 1996 基礎科學硏究誌 Vol.14 No.-
Using the scalar variational method with the Hermite-Gauss functions, we obtain the matrix eigenvalue equation. This equation can be applied for the waveguides with the complex geometry or the nonuniform distribution of the refractive index. This method has good accuracy for a ridge waveguided, as an example of the accuracy test.
Initial Mode Decision Method for Clustering in Categorical Data
양순철,강형창,김철수 한국데이터정보과학회 2007 한국데이터정보과학회지 Vol.18 No.2
The k-means algorithm is well known for its efficiency in clustering large data sets. However, working only on numeric values prohibits it from being used to cluster real world data containing categorical values. The k-modes algorithm is to extend the k-means paradigm to categorical domains. The algorithm requires a pre-setting or random selection of initial points (modes) of the clusters.This paper improved the problem of k-modes algorithm, using the Max-Min method that is a kind of methods to decide initial values in k-means algorithm. we introduce new similarity measures to deal with using the categorical data for clustering.We show that the mushroom data sets and soybean data sets tested with the proposed algorithm has shown a good performance for the two aspects(accuracy, run time).
유전물질이 부분적으로 채워진 도파관에서 사이클로트론 공명에 의한 전자기파의 증폭
양순철 木浦大學校基礎科學硏究所 1991 基礎科學硏究誌 Vol.9 No.-
An analytical treatment of the excitation of electromagnetic modes by an annular electron beam in a cylindrical waveguide partially loaded with a dielectric is presented. Solving the linearized Vlasov-Maxwell equations with appropriate boundary conditions, we derive a dispersion relation. The characteristics of growth rates is investigated in the regime of various parameters. To maximize the growth rate, we discuss a useful set of optimized parameters. Also, it is showen that submillimeter microwaves might be amplified by making use of a mildly relativistic electron beam.