直角變位圖와 撓角法을 利用한 山形 Rahmen의 應力解析에 관한 硏究 : 水平 및 鉛直荷重 作用時

延吉煥 충남대학교 공업교육연구소 1980 論文集 Vol.3 No.2

This study deals with a stress analysis of the gable frame, calculating the angle of rotation of the member by the right angle transformation which occurs at each panel point which is a basic unknown quantity of the gable frame. In this research, the gable frame that is associated with complex stress analysis is studied by the slope-deflection method which is broadly used in statically indeterminate structures applying the right angle transformation.

자궁내막증의 임상적 고찰

강길전,유병대,원철,이기환 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.2

Objective : Between 1991 and 1993 data were collected to evaluate risk factors for endometriosis. Design : A case-control study was conducted on 54 cases with laparotomically confirmed pelvic endometriosis consecutively admitted to CNUH. The control group consisted of 60 women admitted to hospital for benigh gynecologic disease. Results : No relation emerged with marital status, age at marriage, marital life, level of education, socio-economic status, age at menarche, menstrual regularity, number of spontaneous abortion, duration after last delivery, height and weight. But compared to control group, longer menstrual period, larger menstrual amount, severe menstrual pain, less number of parity, and less number of induced abortion signifcantly increased risk of endometriosis Conclusions : This study showed that frequent menstrual cycles and long period of menstruation with frequent and large amount of retrograde menstrual flow increased the risk of endometriosis.

麗水近海의 海況特性에 관한 硏究

曺炷煥,金永成,李吉洙 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

This study was done for the purpose of effectively preserving the fishing grounding which are existing and will be newly established in Yeosu coastal areas. Accordingly, the oceanegrahic conditional characteristics of these areas were investigated in February, May, September and November, 4 times each year from 1984 to 1985, that results are as follows: 1. The mean water temperature was high by 24.4℃ in Deukyang Bay in September 1984 and low by 3.8℃ in Yeoja Bay in February 1985. In comparison of water temperature with common year, it was high by 0.2~1.1℃ in February and May and low by 0.3~1.1℃ in September and November 1984, and 1ow by 1.2~2.0℃ in February to November 1985. 2. The distribution of salinity was 14.8~34.0‰ for two years:14.8~33.9‰ in 1984 and 31.2~34.0% in 1985. The mean distribution was low by 29.2‰ in September 1984 and high by 33.6% in February 1985. The distributions in each coastal area were low by 23.1% in KwangyangBay in September 1984 and high by 33.9% in the external sea of Keumsan area. In comparison of saliaity with common year, it was low by 0.2~2.0‰ in May, September and November 1984 and high by 0.5~l.6‰ in February, May and September 1985. It was high by 0.2~O.7‰ respective1y. 3. The distribution of dissolved oxygen was 3.2~88㏄/ℓ for two years : 3.5~7.8㏄/ℓ in 1984 and 3.2~88㏄/ℓ in 1985. The distribution were high by 0.7㏄/ℓ in February and low by 7.4㏄/ℓ in September 1984 and high by 7.4㏄/ℓ and low by 4.5㏄/ℓ in May 1985. The distributions in each coastal area were high by 8.4㏄/ℓ in Gamag Bay and low by 3.9㏄/ℓ in Kwangyang Bay in 1985. 1n comparison of distribution with common year, it was low by 0.1~O.3㏄/ℓ in 1984 and high by 0.2~0.6㏄/ℓ in 1985. 4.The distribution of PO_4-P was 0.Ol~5.O8㎍-at/ℓ for two years: 0.O1~5.48㎍-at/ℓ in 1984 and 0.01~3.44㎍-at/ℓ in 1985. The distribution was high by 1.65㎍-at/ℓ in Kwanyang Bay in November 1985 and low by 1.65㎍-at/ℓ in the external sea of Keumsan area. 5. The distribution of NO_2-N was 0.01~ll.7㎍-at/ℓ for two years : 0.01~8.48㎍-at/ℓ in 1984 and 0.02~ll.79㎍-at/ℓ in 1985. The distribution was low by 0.02㎍-at/ℓ in Gamag Bay in September 1984 and high by 5.32㎍-at/ℓ in Kwangyang Bay in September 1985. 6. The distribution of SiO_2-Si was 0.18~71.5㎍-at/ℓ for two year 036~71.50㎍-at/ℓ in 1984 and 0.18~27.18㎍-at/ℓ in 1985. The distributions were high by 31.81㎍-at/ℓ in Kwangyang Bay in September 1985 and low by 1.5~3㎍-at/ℓ in Yeoja Bay in May 1985.

Salpingitis Isthmica Nodosa의 임상적 연구

강길전,이오성,이기환 충남대학교 의과대학 지역사회의학연구소 1994 충남의대잡지 Vol.21 No.2

A clinical study was performed to evaluate the significance of 77 patients with salpingitis isthmica nodosa(SIN)who were confirmed on surgical specimens. The results were as follows. 1. The prevalence age of SIN was 30 decade. 2. The suspicious causative factor was not found from past history. 3. Bilaterality was found only 1/3 of cases. 4. Nearly twenty percent of SIN patients was found as ectopic tubal pregnancy. Accordingly, if HSG is suggestive of SIN, microsurgical removal of SIN lesion will be preventive measure for ectopic pregnancy. 5. Nearly one quarter of SIN patients was found as infertility. Accordingly, if HSG is suggestive of SIN and all infertility work-up are normal, microsurgical correction of SIN will be valuable.

홍국균의 최적배양조건에 관한 연구

정순택,임종환,박양균,황금택,박현진,안찬영,강성국,문길만 木浦大學校 工業技術硏究所 1994 工業技術硏究誌 Vol.4 No.-

Cell growth and pigment productivity of Monascus anka KCCM 11832 and Monascus sp. has isolated from the Korean Maeju(soybean koji) were determined for effect of culture medium composition and incubation conditions. Increase of NH₄NO₃, and KH₂PO₄ concentration as mineral source promoted mycelium growth, and the highest cell growth was showed in the medium with 0.05% KH₂PO₄ when C/N ratio is 20:1, but pigment production was significantly inhibited at higher concentration than this level. Cell growth and pigment production in porato dextrose medium were higher than those in czapeck-dox broth and malt extract medium. In terms of temperature, the highest cell growth was showed at 34℃, but pigment productivity was the highest at 26℃.

建築工業敎育科 敎育改善에 관한 硏究 : 敎育課程을 中心으로 Focused on the development of curriculum

李昌甲,朴萬植,延吉煥,崔武革,李基男 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.1

Due to the radical change of society and the technological innovation, it is inevitable to rearrange the educational objective of the Department of Architectural Engineering Education and to reorganize the curriculum responding to the objective. In this study, all the current curricula of architectural institutions have been analized to identify problems, and the educational objective of the department of architectural engineering education have been established based on the objective of the College of Industrial Education. As the result of the above studies, the model curriculum for the major subjects have been developed in order to have following characteristics. 1. The required subjects were limited to the basic fields in order to cover the education in the technical high school. 2. The elective subjects were organized into three fields, namely, architecture, structural engineering, and building materials and construction to meet the diversified demands to a possible maximum extent.

Moving Coil Type L.O.A의 설계 및 동특성 해석

강길환(Kil-Whan Kang),김덕현(Duk-Hun Kim),홍정표(Jung-Pyo Hong),김규탁(Gyu-Tak Kim) 대한전기학회 1998 대한전기학회 학술대회 논문집 Vol.1998 No.7

듀얼 데이터 캐쉬를 위한 적응 선택 기법

이길환(Kil-Whan Lee),박기호(Gi-Ho Park),한탁돈(Tack-Don Han),김신덕(Shin-Dug Kim) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1A

본 논문에서는 듀얼 데이터 캐쉬(Dual Data Cache)를 위한 효율적인 선택 기법을 제안한다. 듀얼 데이터 캐쉬는 두 개의 지역성을 반영하기 위하여 제안된 구조이다. 이러한 캐쉬의 성능은 참조 실패 시에 참조 실패된 블록을 어떤 캐쉬로 적재할 것인지에 대한 선택 기법에 의해 결정된다. 이러한 선택 기법에 있어서 어떤 참조가 공간적 지역성(spatial locality)이 큰지 아니면 시간적 지역성(temporal locality)이 큰지를 효율적으로 예측하는 것이 중요하다. 본 논문에서는 이러한 지역성을 좀 더 효율적으로 예측하기 위해서는 공간적 지역성 체크 테이블(spatial locality checking table, SLCT)을 이용한 새로운 적응 선택 기법을 제안하였다. 공간적 지역성 체크 테이블은 공간적 지역성을 좀 더 효율적으로 예측하기 위하여 사용되었다. 성능 평가를 위하여 트레이스 구동 시뮬레이션을 수행하였으며, 블록 크기가 큰 캐쉬가 기존의 캐쉬 블록 크기보다 큰 경우에는 평균 메모리 접근시간이 같은 크기의 기존 캐쉬보다 10%에서 50%의 성능 향상이 있음을 확인하였다.

David II: 효과적인 메모리 시스템을 가지는 병렬 렌더링 프로세서

이길환 ( Kil-whan Lee ),박우찬 ( Woo-chan Park ),김일산 ( Il-san Kim ),한탁돈 ( Tack-don Han ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.1

Current rendering processors are organized mainly to process a triangle as fast as possible and recently parallel 3D rendering processors, which can process multiple triangles in parallel with multiple rasterizers, begin to appear. For high performance in processing triangles, it is desirable for each rasterizer have its own local pixel cache. However, the consistency problem may occur in accessing the data at the same address simultaneously by more than one rasterizer. In this paper, we propose a parallel rendering processor architecture, called DAVID II, resolving such consistency problem effectively. Moreover, the proposed architecture reduces the latency due to a pixel cache miss significantly. The experimental results show that DAVID II achieves almost linear speedup at best case even in sixteen rasterizers.

깊이 검사 결과에 의한 선택적 적재 방법을 가지는 픽셀 캐쉬 구조

이길환(Kil-Whan Lee),박우찬(Woo-Chan Park),김일산(Il-San Kim),한탁돈(Tack-Don Han) 한국정보과학회 2003 정보과학회논문지 : 시스템 및 이론 Vol.30 No.9·10

최근 대부분의 3차원 그래픽 렌더링 프로세서는 메모리 접근 지연 및 대역폭을 줄이기 위해 깊이 데이타와 색상 데이타를 가지고 있는 픽셀 캐쉬(pixel cache)를 사용한다. 본 논문에서는 렌더링 프로세서의 성능을 향상시키기 위한 효과적인 픽셀 캐쉬 구조를 제시한다. 제안하는 픽셀 캐쉬 시스템은 기본적으로 3차원 렌더링 프로세서에서 수행되는 깊이 검사(Z-test) 결과에 의해 선택적으로 깊이 데이타를 캐쉬에 저장하며, 색상 데이타는 별도의 버퍼에 저장한다. 시뮬레이션 결과에 의하면 16K바이트의 제안하는 캐쉬 시스템이 32K바이트의 일반적인 캐쉬보다 더 나은 성능을 보인다. Recently most of 3D graphics rendering processors have the pixel cache storing depth data and color data to reduce the memory latency and the bandwidth requirement.In this paper, we propose the effective pixel cache for improving the performance of a rendering processor. The proposed cache system stores the depth data selectively based on the result of Z-test and the color data are stored into the auxiliary buffer. Simulation results show that the 16Kbyte proposed cache system provides better performance than the 32Kbyte conventional cache.