광 교환 기술을 이용한 ATM 백본 네트워크

최영복,고성택,김경연,김경식 濟州大學校 工科大學 産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.2

The B-ISDN(Broadband-Integrated Service Digital Network) transports various multimedia information effectively. So optical switching networks which consist of optical transmission links and photonic switching systems are noticeable as a way of a large capacity communication. In this paper, we propose optical packet switching networks which will be used as the backbone network of national high speed communication networks which are operated a way of ATM(Asynchronous Transfer Mode). The B-ISDN transport networks are composed of two-layered networks such as regional networks and a backbone network. The regional network is an average ATM transport network. The optical backbone network gathers fixed length of several ATM cells which come from regional networks, attaches an optical header, and completes an optical packet. And then the network switches and transports with high speed. That is, the backbone network is a transparent optical packet network. The passing speed of signal in the photonic switch is rapid, but the switching speed is limited and the processing speed of the switching controller which consists of electronic circuit is limited. So the optical packet which consists of multi-ATM cells is able to overcome it in the optical backbone network. The performance evaluation by the computer simulation shows us the efficiency of the proposed way of optical packet switching.

마이크로센서 응용을 위한 실리콘 미세가공 기술

고희선,김영민,권대혁,도양희,이광만 제주대학교 산업기술연구소 1999 尖端技術硏究所論文集 Vol.10 No.2

Silicon micromachining technology can be used to build microsensors and actuators by using tools derived from standard IC processing. For the silicon micromachining the etching characteristics of tetramethyl ammonium hydroxide (TMAH) by dissolving silicon powder or silicic acid have been studied. The 3, 5 and 10wt.% TMAH solutions, with dissolved silicon powder (6g/l) or with dissolved silicic acid(Si(OH)4, 16g/l) were used. And ammonium peroxydisulfate (APODS, 2g/l) dissolved in the solutions were also used. The etch rates of silicon and the etched surface roughness were observed with various etching conditions. The crystallographical aspect on the crystal orientation of silicon have been studied. With sufficiently fresh solutions, these TMAH concentration and combination of etchants, provide repeatable etch properties, does not attack exposed aluminum or silicon dioxode, and provide smooth (100) silicon surfaces.

실리콘 미세가공 기술을 이용한 마이크로 진공 센서

이광만,고성택,김영민,고희선 濟州大學校 工科大學 産業技術硏究所 1998 尖端技術硏究所論文集 Vol.9 No.1

A micro-vacuum sensor has been fabricated by using silicon micromachining techniques and platinum thin film. NON insulator was deposited by LPCVD and APCVD methods. The insulator diaphragm was fabricated by silicon anisotropic etching in TMAH solution. Thin film platinum heater and temperature detector were deposited by rf sputtering method and patterning was performed by means of lift-off method. Deposited platinum heater and temperature detector have been shown a linear Ⅰ-Ⅴ characteristics. TCR(temperature coefficient of resistance) of thin film platinum heater and temperature detector was about 0.0042/℃. Fabricated vacuum sensor was measured in the range of 1x10­³Torr to 1×10² Torr, and shows a good linear operating characteristics in the range of 1x10­² Torr에서 1x10˚Torr.

마이크로센서 응용을 위한 실리콘 미세가공 기술

고희선,김영민,권대혁,도양회,이광만 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.2

Silicon micromachining technology can be used to build microsensors and actuators by using tools derived from standard IC processing. For the silicon micromachining the etching characteristics of tetramethyl ammonium hydroxide (TMAH) by dissolving silicon powder or silicic acid have been studied. The 3. 5 and l0wt.% TMAH solutions, with dissolved silicon powder (6g/l) or with dissolved silicic acid(Si(OH)_(4), 16g/1) were used. And ammonium peroxydisulfate (APODS. 2g/l) dissolved in the solutions were also used. The etch rates of silicon and the etched surface roughness were observed with various etching conditions. The crystallographical aspect on the crystal orientation of silicon have been studied. With sufficiently fresh solutions, these TMAH concentration and combination of etchants. provide repeatable etch properties. does not attack exposed aluminum or silicon dioxode. and provide smooth (100) silicon surfaces.

종합정보통신망을 통한 제주지역 농산물 유통정보모델 구축에 관한 연구

김장형,곽호영,이상준 濟州大學校 産業技術硏究所 1995 산업기술연구소논문집 Vol.6 No.-

In this paper, we proposed a total information system model for cheju farming industv. The purpose of the model is to provide the useful informations and services about cheju farmings. For this purpose, we analized the various types of the cheju farming system. And analized the distribution channels of the agricultural products. And surveyed the kind of agricultural informations needed for the peasants. Using the surveyed data, we designed a computer information system moodel which is conceptually attached on the ISDN.

제주지역 숙박시설의 에너지소비실태 조사

고영훈,임홍성,최동호 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1

유전 알고리즘에 의한 유연 공정계획 모델

문치웅,김장형 濟州大學校 産業技術硏究所 1996 산업기술연구소논문집 Vol.7 No.1

Process planning is the task of generating a plan for transforming raw material to finished part according to CAD informations and manufacturing prcatice. The task of process planning includes the determination of the sequence of a part. machines, and tools. In this paper. we proposed a flexible process planning model for the process sequence and machines selection on process planning problems. Process sequencing should consider a set of constraints imposed by the design information and manufacturing practice. Determination of an optimal machining process sequencing for complex parts results in the need to consider a large solution space. This paper presents an improved method for process sequences and machines selection that permits the efficient application of genetic algorithms. To apply the genetic algorithm to the process sequencing and machines selection problem, the representation, selection, and genetic operators are studied, and then modified genetic algorithm for optimal machining process sequencing and machine tools selection is proposed.

막분리기술을 이용한 과실쥬스의 농축에 관한 연구 : 1. 한외여과막을 이용한 유자액즙의 청징

하진환,송대진,김효선 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.1

For the application of membrane separation technique on food processing. the effects of molecular weight cut-off (MWCO) of ultrafiltration membrane during clarification of citron juice was investigated. When citron juice was clarified using 1K, 20K, 50K and 100K daltins MWCO sprial wounded membranes. the larger the membrane pore size, the higher the permeate flux and total solid content and the smaller the membrane pore size. the lower the turbidity while showing higher L-value. During storage pH of ultrafiltered citron juice was slowly down without sudden change while soluble solid content and acidity were decreased gradually. Turbidity and browning during storage were also increased with especially great range in large MWCO. L-value was higher in smaller membrane pore size but shown stability without great change.

WIND ENERGY POTENTIAL ASSESMENT and SITING a WIND FARM in CHEJU ISLAND

김건훈,조경호,고장권,허종철,고경남 濟州大學校 工科大學 産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.2

본 연구는 제주도내 풍력발전기 보급 및 적지선정을 검토하는데 그 목적을 두었다. 이를 위하여 제주도내 다풍지역으로 예상되는 3개지역을 선정하여 1년간 풍력자원조사를 행하였고, 계측된 자료는 통계분석으로 풍력자원을 정량화하였으며 또한 세계적으로 경제성이 인증된 600kW 풍력발전기를 모델로하여 가상 출력을 산출함으로서 최적 풍력단지를 제시하였다. The possibility in the practical use and supply of the wind turbine in Cheju island was investigated. The wind data measured in three regions which have a plenty wind energy potential were utilized to quantify the wind power resources by statistical analysis. Power output was calculated for 600 kW wind turbine. The coastal area of Guja was superior to Daejung and Hoichun in wind power energy densities. The calculated capacity factor of 600 kW wind turbine in this site was high as much as 30%. Hoichun site, the intermediate region between the Halla mountain and the sea, was rich in wind power energy resources in winter. Hourly ideal energy density at three regions increased at sunrise, reached the maximum at 13-16 O'clock, decreased steadily, and finally remained constant at sunset.

Image encryption and identification for security verification

Kim, Jong-Yun,Doh, Yang-Hoi,Kim, Soo-Joong 濟州大學校工科大學産業技術硏究所 1999 尖端技術硏究所論文集 Vol.10 No.1

컴퓨터형성 홀로그램과 무작위 위상 마스크, 광상관 기술을 이용하여 신원보증을 위한 새로운 영상 암호화와 신분증명 체계를 제안하였다. 보안제품에 부착되는 암호화된 영상은 4진 위상 컴퓨터형성 홀로그램에 무작위 위상 함수를 곱하여 제작하였다. 무작위 위상 함수는 암호화된 영상을 복원할 때 핵심적인 역할을 한다. 암호화된 영상은 2-f 영상복원 시스템을 이용하여 복원하고, 4-f 상관 시스템을 이용하여 개인의 신원증명을 위한 확인작업을 자동적으로 수행한다. 제안된 방법을 원래의 영상을 복원하고 암호화된 영상을 인식하는데 사용할 수 있음을 시뮬레이션 결과를 통하여 보였다. A new image encoding and identification scheme is proposed for security verification by using a CGH(computer generated hologram), random phase mask, and correlation technique. The encrypted image, which is attached to the security product, is made by multiplying QP-CGH(quadratic phase CGH) with a random phase function. The random phase function plays a key role when the encrypted image is decrypted. The encrypted image can be optically recovered by a 2-f imaging system and automatically verified for personal identification by a 4-f correlation system. Simulation results show the proposed method can be used for both the reconstruction of an original image and the recognition of an encrypted image.