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제 1형 신경섬유종증 환자에서 발생한 위장관 간질종양 1예
원경준,이준,변유미,조민근,한경택,김원,홍란,임성철,김경종,김영대,박찬국,김만우 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2
Gastrointestinal stromal tumor (GIST) is the most common non-epithelial neoplasm arising in the gastrointestinal tract, but this tumor is rarely seen in association with type l neurofibromatosis (NFl) Generally, the majority of GISTs are isolated neoplasm and they are sporadically found in the stomach, but the GISTs in NFl patients are usually multiple and usually found in the small intestine. We report a case of multiple GISTs in the jejunum of a 63-year-old woman diagnosed as NFl accompanied by complication of gastrointestinal bleeding, In this case, Patient had multiple cafe-au lait spots and neurofibroma on skin and had freckling on axilla and groin, and then, we made a diagnosis of NFl. Gastrointestinal bleeding is controlled by resection of multiple GISTs. Generally, only 3-5% of all gastrointestinal bleeding comes from the small bowel. Causes of small intestinal bleeding are angiodysplasia, neoplasm, NSAIDs induced ulcer etc. but, If patients have NFl accompanied by complication of gastrointestinal bleeding, GISTs on small bowel must be considered.
김종태,배두원,김만일,정교철 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
To study the relations of underground/surface-water exhaustion and excessive pumping, we have analyzed river, geological characteristics, recharge rate of rainfall and underground-water level. The ground water recharge rate from the SCS-CN analysis is 8.4%, and the recharge is computed in 6.4111 x 10^(5)㎥/y. This results mean that a big drawdown in observation holes may be occurred by excessive pumping. From in-situ hydraulic conductivity test, hydraulic conductivity in basement of the study area is calculated in 7.996 x 10^(-6)-2.067 x 10^(-6)m/sec. The underground/surface-water in the study area with small underground-water recharge rate will be exhausted by long time pumping.
웨이브렛 계수의 공간적 유사성을 이용한 비디오 영상 압축
문종현,방만원 木浦大學校 應用科學硏究院 2001 應用科學硏究誌 Vol.1 No.-
This paper presents a wavelet-based compression and decompression algorithm using spatial similarities of video sequences. The simulation results show that the proposed algorithm provides high compression ratio with proper image quality. It also outperforms the previous Hilton's algorithm in an image quality, compression ratio and running time, leading to compression ratio less than 0.2bpp, PSNR of 32 dB and running time of 10ms for a standard video image.
정전위 SSRT법에 의한 해양구조물용 Cu함유 고장력저합금강의 수소취성한계전위 규명에 관한 연구
김성종,박태원,심인옥,김종호,김영식,문경만 한국해양대학교 해양과학기술연구소 2001 硏究論文集 Vol.10 No.1
A marine structural material was well known to have high tensile strength, good weldability and proper corrosion resistance . Cu-containing high strength low alloy (HSLA) steel was recently developed for their purposes mentioned above, And the steel is free about preheating for welding, therefore it is reported that shipbuilding cost by using it can be saved more or less. However the marine structural materials like Cu-containing HSLA steel are being generally adopted with cathodic protection method in severe corrosive environment like natural sea water but the high strength steel may give rise to Hydrogen Embrittlement due to over protection at high cathodic current density for cathodic protection. In this study, Cu-containing HSLA steel using well for marine atructure was investigated about the susceptibility of Hydrogen Embrittlement as functions of tensile strength, strain ratio, fracture time, and fracture mode, etc. and an optimum cathodic protection potential by slow strain rate test(SSRT) method as well as corrosion properties in natural sea water. And its corrosion resistance was superior to SS400 steel , but Hydrogen Embrittlement susceptibility of Cu-containing HSLA steel was hider than that of SS400 steel. However Hydrogen Embrittlement of its steel by SSRT method was showed with pheonomena such as decreasing of fracture time. strain ratio and fracture mode of QC (quasi-cleavage) Eventually it is suggested that an optimum cathodic protection potential not presenting Hydrogen Embrittlement of Cu-containing of HSLA steel by SSRT method was from-770mV(SCE) to - 900mV(SCE) under natural sea water. (Received September 21, 2000)
네트워크 지연시간을 고려한 CAN 기반 피드백 제어시스템의 응답특성 분석
전종만,김대원 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
The paper analyzes the response characteristics of the system when considering the message delay time for a message transfer in a CAN-based control system. The message delay time is composed of a computation delay time and a communication delay time. The application layer of CAN communication is modeled in order to analyze two kinds of delay time mathematically and the communication delay is re-defined under the limited conditions. The CAN-based feedback control system is proposed as a target system that is the machining system with three axes. The response delay characteristics of the proposed system is analyzed through simulation and is improved by the compensation using the PID tuning method to meet the design specification of the system.
박종천,오재영,정용욱,주현수,이원교,유춘만,이우범 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-
The biological surveys were performed at seven sites in the Gangjin bay from February, 1998 to November, 2001. In order to analysis of environmental variation, numbers of heterotrophic bacteria, general fungus and fecal coliforms were enumerated in each sample. The result showed that variation range of heterotrophic bacteria, general fungus, and fecal coliforms were 2.9 x 10^(3)~9.6 x 10^(3) CFU/ml, 17.2~80.1 CFU/ml, and 6.3~682.5 CFU/100ml for four tears(1988~2001), respectively. Density of heterotrophic bacteria and general fungus were gradually decreased for four tours, while fecal coliforms were suddenly increased. Specially, numbers of fecal colifoms were increased the more 100 times in 2001 than that 1998. We think that it was probably caused a little rainfall in February, 2001. There result suggests that ecosystem of Gangjin bay were mainly regulated by 2~3 factors, which were inflow of fresh water, salinity and variation of water temperature.
정종윤,황영수,이춘만,정원지,고태조 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.4
The properties of a machine tool greatly affect machining quality since a machine tool has large variance in its features. Machine tool makers want to find best machining condition with the one that they have built. Machine builders need to develop test specimen since it helps finding characteristics of machine tools when the machining properties of the specimen are analyzed. This paper develops test specimen to identify features of the main spindle, the feeding device, and the frame of a machine tool. The specimen is machined with a high speed machine and the features of the machine are analyzed with test items. They are surface roughness, overshoot in axial movement, errors in circular movement, feeding with small movement, and compensational error. This work can improve usability for a machine tool in machining practice.
류성만,최원영,이미경,이종욱 嶺南大學校 基礎科學硏究所 1992 基礎科學硏究 Vol.12 No.-
저자들은 1992년 9월20일부터 1992년 11월 7일까지 경상북도 경산시 영남대학교 교내에 위치한 삼천지에 대한 곤충상을 조사하였다. 연구 결과 총 8目 56科 121屬 132種이 서식하고 있는 것으로 밝혀졌다. We studied insect fauna in the Samchun-impoundment during the period of from september 20, 1992 to November 7, 1992. The total number of insect taxa are composed of 132 spceies, 121 genera, 56 families, 8 orders including this examination.