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林顯埈 최신의학사 1971 最新醫學 Vol.14 No.9
The author report here the clinical data of 18 cases of tonsillar cancer which verifide histopathologically during six year period (Jan. 1965-Dec. 1970) at the Dept. of Otolaryngology, S. N. U. H. . The results were as follows; 1. The histopathological classification revealed 11 cases of malignant lymphoma, 4 squamous cell carci?noma;2 undifferentiated cell carcinoma and 1 anaplastic cell carcinoma. 2. The age distribution was even and the sex ratio was almost equal in malignant lymphoma, whereas the squamous cell carcinoma was found chiefly in fifth and sixth decades and in man. 3. Most of the cases (more than 80%) complained of sore throat and more than 70% of the cases had visited the clinic within three months after onset.
임현준 한국공학교육학회 2014 공학교육연구 Vol.17 No.2
This paper is about a case study of an interdisciplinary and intercultural collaborative design project course that has beenoffered for six years. The distinct characteristics of this course lie in that its students consist of those in two different disciplines,mechanical engineering and industrial design, and also in two different countries, Korea and Germany. The themes of the designproject have been selected differently over the years, but always were related to transportation and, particularly, personal mobilitydevices. The paper first delineates the course and illustrates examples of the outcomes. Then, unique aspects and challenges ofthe course that have been observed through the six runs and that are associated with the intercultural and interdisciplinary natureare indicated and discussed. The author is convinced that this course has been successful in helping prepare the students forglobally-operating manufacturing companies in the future. It is hoped that the findings from this course and the discussionscontained in this paper would help those who plan to offer similar courses.
건축물에 적용 가능한 정교한 문양거푸집 개발을 위한 기초적 연구
임현준,김병천,박선길,김우재,정재욱,정상진 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
Contemporary architecture calls for a wide range of surface textures and treatments. A surface compatible with the architect's design may vary from a glass-smooth finish to one requiring special sculptured ornamentation. These surfaces require many different types of form sheathing and lining. Chemical retarders applied to the form surface make it possible to remove surface mortar and expose the aggregate after forms have been removed. Variation in finish may also be achieved by grinding, chiseling, hammering, and sandblasting after the concrete has set. Precast panels as forms or liners may provide the desired surface finish; sometimes a combination several of these techniques is used.
유전자 알고리즘과 FDTD 방법을 이용한 접지면 U 슬롯 구조의 마이크로스트립 안테나 설계
임현준,윤현보 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.2
본 논문에서는 유전자 알고리즘을 이용하여 접지면에 4개의 U 슬롯을 가지는 광대역 소형 마이크로스트립 안테나를 설계하는 방안을 제시하였다. 안테나의 해석을 위해 적합도 함수로서 FDTD 기법을 사용하였고, 정방형 패치의 길이, 접지면 슬롯의 길이, 중심선으로부터 급전점까지의 거리가 최대의 대역폭과 최소의 크기를 가지기 위한 최적화 파라미터로 사용되었다. 실제 안테나를 제작하여 측정한 결과, 2.445 GHz에서 10 dB 대역폭이 15.63 %이고, 최대 이득이 3.61 dBi이며, 일반 마이크로스트립 안테나에 비해 크기는 54.8 % 감소하였다. This paper presents a broadband compact microstrip antenna design with four U slots on the ground plane by using of genetic algorithm. FDTD method is used as fitness function for antenna analysis, and length of rectangular patch, length of ground plane slot, distance from center point to feed point is used as optimization parameter for maximum bandwidth and minimum size. The measurement result of implemented antenna present 10 dB bandwidth of 15.63 % and peak gain of 3.61 dBi in the 2.445 GHz, and antenna has a reduced patch size of 54.8 % compare with normal microstrip antenna.
균열에 의한 초음파 산란 현상의 해석해 계산 프로그램 개발
任賢準,李東厚 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
Analytical solutions are sought for the scattering of a plane longitudinal ultrasonic wave by a semi-infinite crack embedded in an infinite elastic medium. Stress formulation for exact solution to this problem, available from the literature, is modified and extended for displacement fields. In the formulation, the Wiener-Hopf technique and the Cagniard-de Hoop method are used to solve the mixed-boundary problem. The angular distribution of the displacement magnitude due to the diffracted longitudinal wave is obtained for various angles of the incident longitudinal wave, several characteristics of the diffracted wavefield have been observed: for example, the displacement fields are symmetric with respect to the crack faces. In order to confirm the accuracy of the formulation and program for the exact solution, the results are compared with the approximate solution obtained by the geometrical theory of diffraction. It has been found that the two solutions for the longitudinal diffracted wave agree well with each other in terms of their angular distributions. Though the exact solutions for further similar problems must be found and confirmed, the analytical solutions and the programs developed in this study will play an indispensable role in the development of a reliable ultrasonic simulator.