초고해상도의 기가픽셀 디지털이미지 획득을 위한 로봇 카메라의 시차연구

임천석 한국광학회 2020 한국광학회지 Vol.31 No.1

First, if we want to design and construct a robotic camera, we need to understand the parallax errors between adjacent images, caused by rotation and movement of the robotic camera system. In this paper, we try to derive the mathematical formulation of parallax error and connect it to a conventional lens system, to obtain a useful, generalized, analytic algebraic expression for the parallax error. Utilizing this expression, we can structurally design a robotic camera, and study the Google ART camera as an example of a robotic camera.

The Optical Design of Miniaturized Microscope Objective for CARS Imaging Catheter with Fiber Bundle

임천석 한국광학회 2010 Current Optics and Photonics Vol.14 No.4

In coherent anti-Stokes Raman scattering (CARS) microscopy reported until now, conventional microscope objectives are used, so that they are limited for introduction into a living body. Gradient-index (GRIN) rod lenses might be a solution for miniaturized microscope objectives for in-vivo CARS microscopy. However, due to the inherent large amount of chromatic aberration, GRIN rod lenses cannot be utilized for this purpose. CARS imaging catheter, composed of miniaturized microscope objective and fiber bundle, can be introduced into a living body for minimally invasive diagnosis. In order to design the catheter, we have to first investigate design requirements. And then, the optical design is processed with design strategies and intensive computing power to achieve the design requirements. We report the miniaturized objective lens system with diffraction-limited performance and completely corrected chromatic aberrations for an in-vivo CARS imaging catheter.

일본경제의 對中관계 확대와 일본산업의 구조변화 연구

임천석 한국일본학회 2006 日本學報 Vol.69 No.-

어안렌즈 시야각의 광각화에 따른 조도저하의 원인과 개선방안에 관한 연구

임천석,Rim, Cheon-Seog 한국광학회 2012 한국광학회지 Vol.23 No.5

어안렌즈(fisheye lens)란 통상 초 광각의 시야각을 가지는 렌즈를 일컫는다. 초 광각의 시야각을 가지는 렌즈에서는 주변부시야각으로 갈수록 상의 조도가 급격히 저하하게 되는데, 본 논문에서는 이의 원인과 개선방안에 관해 논의한다. 왜냐하면 어안렌즈와 같은 초 광각의 렌즈에서는 기하광학적인 수차특성보다 오히려 시야각의 안정적인 확보가 광학적인 성능을 훨씬 더 좌우할 수 있기 때문이다. 그러므로 이를 위해, 먼저, 방향코사인벡터의 부호규약과 곡면 상에서의 법선벡터의 방향을 해석기하학적으로 다룬다. 이어서 해석기하학적인 논의를 바탕으로 조도저하의 다양한 원인들에 대해 수치 및 원리적인 분석을 실시하고, 개선에 대한 방안들을 제시한다. Lenses with an ultra wide angle of view are usually called fisheye lenses since a fish can see an ultra wide panoramic view under water. As the angle of view for these kinds of lenses reaches a wide angle, the illumination on an image sensor is reduced by a rapid drop. In this paper, we discuss the causes and the ways to correct for a rapid drop. First, it is treated for the sign convention of directional cosine vectors and normal vectors on the curved surface by means of analytic geometry. And, from the fundamental discussion for these vectors, the rapid illumination drop is numerically analyzed for various kinds of causes by utilizing geometrical optics and radiometry as well as Fresnel equations derived from electromagnetic boundary conditions. As a result, we are able to get the full understanding for the rapid illumination drop and to propose ways to correct effects due to an wide angle of view.

Laser Scanning Unit용 광학계 설계

임천석 한국광학회 1999 한국광학회지 Vol.10 No.1

레이저 프린터의 핵심부품 중 하나인 LSu(Laser Scanning Unit)를 구성하는 광학부품 및 각 부품들의 역할에 대해서 살펴보았고, 각 부품별로 기초설계를 한 후 Code-V를 사용하여 최적설계를 했다. 특히 f$\theta$렌즈 설게시 기존제품들을 비교.분석하여 설계에 반영했다. 본 논문에서는 LSU의 저가격화 및 소형화를 위해, 초점거리가 136mm인 2매의 플라스틱 f$\theta$렌즈로 구성된 LSU용 광학계를 설계하였다. Laser Scanning Unit (LSU), which is one of the core parts of laser printer, consists of LD Module, cylinder lens, polygon mirror and f$\theta$ lens. After making an initial design on each part, we optimized the one which satisfies the user specification. The optimized optical system has diffraction limited performance for the slit size of 2.7 mm$\times$1.6 mm, f$\theta$ characteristics less than 0.3% and field curvature less 1.2 mm. We also calcurate tolerance of each part based on RSS(Root Sum Square) method to manufacture LSU for mass production.

Zoom접안경에 대한 광설계

임천석,이상수,박충선,김재순 한국광학회 1994 한국광학회지 Vol.5 No.3

출사동의 직경 0.5cm, eye-relief 1cm, 각배율 $M_a=7~15$인 가변배율의 접안경에 대한 Gauss광학적 해석과, 이 해석의 결과에 따른 접안경을 설계하였다. 망원경 대물경의 초점거리$(f_u')$는 21cm이고 그 직경은 6.2cm이다. 반시계각 $\beta는 1.5^{\circ}$이고 출사동에서 $\beta'=1.5^{\circ}\times(7~15)=10.5^{\circ}~22.5^{\circ}$ 이다. 이 zoom접안경은 세그룹으로 이루어져 있으며 각각의 그룹에서 Seidel $3^{rd}$ order aplanatization이 이루어져 있다. 최종 광설계는 optimization으로서 얻어졌으며 눈의 분해능을 기준으로 해서 접안경의 성능이 평가되었다. By Gaussian optics, a zoom eyepiece is analyzed, which has the diameter of exit pupil 0.5 em, eyerelief 1 em, and angular magnification $M_a=7~15$. The initial design is based on this analysis. Telescope objective which was previously designed has focal length($(f_u')$ 21.0 em, and its clear aperture is 6.2 em. Zoom telescope has half field angle $\beta=1.5^{\circ}$ at the entrance pupil and at exit pupil it is $\beta'=1.5^{\circ}\times(7~15)=10.5^{\circ}~22.5^{\circ}$. Zoom eyepiece consists of three groups, of which each one satisfies the Seidel 3,d order aplanatization. Final design is obtained by optimization for the finite ray aberration, and the zoom eyepiece is assessed on the basis of the resolution of eyes.f eyes.

우리 나라 玩具類의 輸出擴大方案

임천석 건국대학교 1980 商經論叢 Vol.- No.15

일본의 통상정책 변화와 對동아시아 FTA추진전략

임천석,민경식 연세대학교 동서문제연구소 2004 東西硏究 JOURNAL OF EAST AND WEST STUDIES Vol.16 No.2

일본-동아시아 관계를 둘러싼 세계 경제의 흐름은 글로벌화, 정보화(또는 IT화), 지역주의라는 화두로 설명할 수 있다. 20세기 후반 정보통신의 비약적인 발전은 자유무역의 확대, 자본이동의 자유화, 시장경제의 촉진에 의해 글로벌화를 가속시켰다. 이러한 글로벌화의 조류는 WTO에 의한 다자간 협상의 추진으로 표출되었으나 다자간 교섭에 난항이 거듭되고 새로운 라운드의 교섭방식과 범위를 둘러싸고, 참가국간의 견해가 크게 분열하면서 지역주의가 대두되기 시작하였다. 아시아에서는 중국이 글로벌화의 기회와 위협의 양면성을 가지고 경제대국으로서 급부상하고 있으며, 97년 아시아에 발생한 통화위기 이후 중국을 비롯한 동아시아 경제는 지역주의화의 움직임을 가속화 하고 있다. 여기에 자극 받은 일본은 세계통상환경 변화와 양국간 또는 지역간 무역자유화 협상의 중요성을 재인식하고 통상정책의 일대 전환을 시도하고 있다. 1990년대 이후 세계경제에서 일본의 위상은 점차 낮아지고 있을 뿐만 아니라 지난 10여 년간의 장기불황으로 침체국면에 빠져 있는 상황에서 정책전환이 요구되었다. 일본은 마침내 90년대 후반부터 WTO의 다자간 무역체제를 유지하면서 양자간 또는 지역주의 무역협정을 추진하는 중층적 통상정책으로 전환하기에 이르렀다. 이러한 정책기조의 변화는 FTA를 적극 추진하는 것으로 표출 되었으며 한일 FTA 협상의 추진도 그러한 맥락에서 접근해야 할 것이다. 본 연구는 세계경제환경 변화에 따른 일본의 통상정책 변화와 정책 수단으로 활용되고 있는FTA의 내용과 특징은 무엇이며 우리에게 주는 시사점은 무엇인지 알아보려 한다. 선행연구로서 일본의 통상정책변화를 FTA 추진 관점에서 자세히 분석한 이홍배(2003)의 연구와 한-일 FTA를 중심으로 분석한 정인교(2001), 김양희(2002)의 연구가 있으나, 본 연구에서는 연구범위를 극히 제한하여 동아시아를 중심으로 한일본의 통상정책변화에 대해 언급하고자 한다. 최근 일본의 통상정책 전개에 대해서는 靑木健(2002)이 동아시아 관계에 대해 자세히 분석하고 있다. 또한 일본의 FTA전략에 관한 연구는 浦田秀次郎(2002)가 있다. 이것은 일본의 시각에서 FTA전략을 논의한 것으로서 일본의 입장을 이해하는데 참고가 된다. 기존 연구는 연구범위가 넓고, 개괄적으로 일본의 통상정책을 다루고 있으나 본 연구에서는 일본의 통상정책변화에서 나타나고 있는 중장기적 정책목표에 초점을 맞춘다. 특히 동아시아에 대한 공격적 통상정책으로의 전환 의도와 FTA를 활용한 정책운용이 우리에게 주는 시사점을 도출하고자 한다. More recently, there is much of renewed interests to form regional integration arrangements in East Asia. The situation has much changed from, previously, where the region used to resist to such a formation. Indeed, regional trade liberalization, in brief, is an important and complex issue on an increasing globalized economy. East Asian Countries are promoting FTA, respectively. Especially in the case of Japan, a large change is shown. Japan has supported the commerce policy of the free trade centering on WTO. However, the negotiation on WTO reached the limit and change of a commerce policy is needed. Recently, Japan is performing a positive commerce policy to East Asia. Japan has already done FTA conclusion with some countries, and is continuing negotiation. This research describes a commerce policy and FTA strategy of Japan. It is the purpose to draw the suggestive point in Korea which is promoting FTA now. In Chapter Ⅱ, the production network and trade relation of Japan which are formed in Southeast Asia are described. In Chapter Ⅲ, an economic assistance relation with East Asia is described. In Chapter Ⅳ. FTA strategy for East Asia of Japan is described.

일본기업의 對아시아 기술이전 실태와 한국의 對日 기술도입 개선방안

임천석 건국대학교 1996 學術誌 Vol.40 No.1

The goal of this paper is to provide ways to accelerate the pace of introducing the Japanese high technology to Korea and increase the efficiency of technology transfer. To this only this study starts with focus on the current situations of the Japanese technology transfer to the Asian countries. This study explains the current conditions on the Korean companies to obtain the Japanese technology and what kind of characteristics are witnessed in introducing the Japanese technology. The paper also examine what sort of cutting-edge technology the Korean companies have. It analyzes the current situations of Korean investments in the Japanese firms and the movement of Korean enterprises to set up a research center in Japan. Finally, on the basis of the results of the paper, it proposes several improved ways to improve the introduction of the Japanese technolgy in Korea. Technology tranfer of the Japanese companies to Asian countries especially to China and Southeast Asia is expected to continue for years to come. When transferring technology, Japan will not change its position on emphasizing foreign direct investment. It is expected that in the case of Korea, Japan will remain reluctant to transfer its technology to Korea, while Japan is expected to transfer its technology to the rest of Asian countries at a more rapid pace. Following are the ways to facilitate the introduction of the Japanese technology to Korea and enhance the efficiency of technology introduction. 1) Korea should avoid the current patters of technology introduction under licence arrangement and diversify the ways to obtain technology, for example, through direct investment and freer move- ment of human resources. 2) In particular, to expand the investment of Japanese companies in Korea, a more favorable investment environment is needed to highlight Korea's strategic importance as middle-ranking economic power in Northeast Asia. 3) The availability of information on technology transfer should be enhanced so that Korea is able to strengthen its negotiating power over the Japanese companies. By making most of its negotiating power, the efficiency of technology introduction can be increased. 4) In order to provide more opportunuties to obtain technology for small and medium-sized com-panies, the Korean conglomerates should aware information on the technology introduction with small and medium-size firms, 5) To further expand access to the Japanese technology, improve the ways to actively utilize the Japanese technological infrastucture by expanding investments in the Japanese companies by estab-lishing a research institute in Japan. The Japanese industrial complexes Kyushu have become promising areas for small and medium-sized companies to make investments. To bolster Korean investments in Japanese companies, close cooperations among the local governments in Korea and Japan should be encouraged.

일본시장의 특징과 한국상품의 對日수출전략

임천석 한일경상학회 2009 韓日經商論集 Vol.45 No.-

The purpose of this research is to show and analyze in detail the characteristic of Japanese market and through that to present a strategy for broadening Korean exportation to Japan. Until these days, most of researches were focused on the characteristic of Japanese trade structure, but only few researches focus on Japanese enterprises which are in competition with foreign companies. Considering the difficulties of the entrance of foreign companies into Japanese market, this research has made an attempt to analyze Japanese enterprises which have strong competitiveness in many industries. From 2002, among the Japan's imports, China took the first place, this research has focused on products in China, its characteristic and its present condition. This research also has paid attention to Japanese manufacturing industry, its production in China and the reimportation of the products and imports by Japanese trade industry. There are not only an observation concerning a trend and the latest changes in Japanese trade industry, but also analytics about successful case of Korean exports to Japan and presentation of a possible plan for its expansion.