발전소 디지털 제어계통의 신뢰도 평가기술에 대한 고찰

문채주,김홍렬,조병수 木浦大學校 工業技術硏究所 1999 工業技術硏究誌 Vol.9 No.-

As applications of digital system are increasing in nuclear power industry, there are increasing on importance of their reliability assessment. This paper describes definition, analysis methods and procedure of reliability for digital system in terms of hardware. The reliability analysis is classified as qualitative method and quantitative method. This paper presents a representative qualitative method, FMEA, and three quantitative methods, Reliability Block Diagram, Fault Event Trees, Markov state Transition Method, which can be applicable in power plant. The comparisons of three quantitative methods are presented for analyst to select a suitable method according to environments of applications. The procedure is also presented for systematic safety and reliability analysis of digital system. Each step of the procedure is described in terms of objective, necessity, method and consideration.

信號交叉路의 交通特性과 左回轉 禁止에 따른 運營效果에 관한 硏究

홍익상,공창환,정우영,임채문 대구대학교 산업기술연구소 1993 産業技術硏究 Vol.12 No.-

This study analyzed the characteristics of the operation of left turns at intersections of the streets in Taegu City. The points of the study were as follows: increase of traffic capacity, decrease of delay time, and to do so this study aims at seeking a way for the most appropriate signal cycle and an effective way to operate intersections. The following are the results: 1st The arterials of Taegu City have a high rate of left turns, and yet are not divided into specific functions, which impairs the efficient use of the functions. It is required that a study be made on the way of utilizing the left turn to the maximum of the operational functions of signalized intersections. 2nd As traffic volume and left turn ratio increase, it was revealed that the optimum signal cycle and delay increased, adoption of efficient lanes was analysed to be most effective at the intersection which have a great of traffic volume and a high or rate of left turns. 3rd On the independent intersection in Taegu city, when left turn is prohibited, it may give poor approaches, but according to analyses this will bring a phenomenal decrease in the optimum signal cycle and delay.

로봇설비의 작업수칙 개정을 위한 전자기적 환경 분석에 관한 연구

홍용규,김태현,문채주 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-

The electric and magnetic field mapping for the surroundings of welding robot facilities with horizontal (A section) and vertical (B section) manipulators are figured in this paper. In case of the electric field mapping with high frequency, the magnitudes on standby mode of the robots show a high level than that on operation mode. At the magnetic field mapping with low frequency, the magnitudes on operation mode indicate a high level than that on standby mode of robots. Therefore, the working rules for operation of robot facilities to secure the safety are revised as : the standby mode of welding robots has to performed with power-off and the working hours of operator on specific area with high level magnetic field should be limited to minimize the exposure.

대형물의 RP 작업을 위한 절단 알고리즘의 개발

채희창,강희용,유상훈,이승현,문홍렬 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.2

Nowadays, as the development period of new products becomes shorter and consumer's requirement is more various, the importance of Rapid Prototyping Technology has been rapidly increased. Rapid Prototyping makes prototypes or functional parts directly using the 3D CAD data. But RP machines can make protypes in limit size. For making large size prototype, we slice solid, which is made of STL file, and then glue sliced solid. And if contact area of part is small, union solid will be easily destroyed for going down of adhesion. So we need to expand contact area, I suggest making a section into stair shape. This paper is concerned with slicing solid on STL file and improving on adhesion.

黃江의 水質과 植物플랑크톤群集에 관한 硏究

文成基,洪菜圭,李相薰,鄭鍾文 慶星大學校 1994 論文集 Vol.15 No.2

A Study on water quality and phytoplakton community was carried out from April, 1992 to March, 1993 in Hwang-Kang. The results obtained on this study are as follows. The value of environmental factors about water quality such as water temperature, pH, precipitation, DO, BOD, NH??₄-N, NO??₂-N, NO??₃-N and PO??₄-P were ranged 1.8-30℃, 6.7-8.4, 3.0-183.6mm, 8.4-14.8 mg/l, 0.7-3.0mg/l, 0.01-0.09 mg/l, 0.10-3.80 mg/; and 0.01-0.19 mg/l respectively. The phytoplankton are identified as 235 taxa including 78 genera, 202 species, 29 varieties and 4 forms. In these study areas the common species occurred frequently were Cyclotella meneghiniana, Fragilaria crotonensis, Melosira varians and Synedra ulna. The causative species of red ride were identified as Microcystis aeruginosa, Trachellomonas hispida, Ceratium hirundinella, Peridinium cinctum, Melosira italica and Staurastrum dorsidentiferum var. ornatum in the areas. The lowest standing crops(20.1 cells/ml) were recorded on January, 1993 and the highest(1,993 cells/ml) were recorded on May, 1992. According to the seasonal succession, dominant species were Fragillaria crotonensis in Spring, Actinastrum hantzschii var. elongatum, Peridinium bipes, Scenedesmus ellipsoidus for. flagellispinosus in Summer, Ceratium hirundinella, Melosira granulata var. angustissima in Autumn and Fragillaria crotonensis in Winter. Saprobic index showed that all stations were β-mesosaprobic.

수입 외국산 모발세정용 화장품의 중금속 농도에 관한 연구

문정아,문덕환,박명희,안진홍,김종은,손병철,김대환,이창희,김휘동,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objective : For the purpose of preparing the fundamental data and preventing the health impairment due yo heavy metals in hair cleaner. Methods and Material : The author determined the concentration of heavy metals(Fb, fn, Cr, Ni and Cu) in hair cleaner with flameless atomic absorption spectrophotometer. Results : The results were as follows : 1. The mean concentration of heavy metals in total hair cleaner were 0.046㎍/g for Pt, 0.O67㎍/g for Mn, 0.069㎍/g for Cr, 0.046㎍/g for Ni, and 0.022㎍/g for Cu, respectively. 2. There was not statistically significant difference to mean concentrations of each heavy metal in hair cleaner by producing nation. 3. The highest mean concentration of each heavy metal in hair cleaner by type of use were 0.140㎍/g for Mn in sensitive hair cleaner(p<0.05), 0.053㎍/g for Cu in others products(p<0.01). 4. The mean concentration of heavy metals in hair cleaner by type of hair cleaner were high at 0.O54㎍/g for Pb in shampoo products(p<0.O5), 0.120㎍/g for Cr and 0.06㎍/g for Cu in combination products(p<0.01). 5. The mean concentration of heavy metals in hair cleaner by acidity were high at 0.056㎍/g for Pb, 0.124㎍/g for Cr, and 0.032㎍/g for Cu in alkali products (p<0.05). 6. Correlation coefficient of heavy metal concentration in hair cleaner were 0.175 for Pb and Cr, 0.165 for Pb and Mn, 0.824 for Cr, and Mn, 0.189 for Cr, and Ni, 0.406 for Cr, and Cu, 0.197 for Mn and Ni, and 0.375 for Mn and Cu(p<0.05). 7. Exposure amount of heavy metals per when we used lOg of hair cleaner (onetime using amount) were 0.46㎍ for Pb, 0.67㎍ for Mn, 0.69㎍ for Cr, 0.46㎍ for Ni, and 0.22㎍ for Cu, respectively. Conclusion : As above results, there was very low level concentration of heavy metal in hair cleaner but we are using the hair cleaner everyday, therefore we can exposed to heavy metals as cronic exposure so the author suggest to prepare the program of preventing the health impairment due to heavy metals.

유방암종에서 p53, cyclin D1 및 cathersin D 단백발현의 의의

문경래,김환정,이미자,기근홍,서재홍,양정원,조현진 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.2

Background and Objectives: Breast carcinoma is a heterogenous disease. The prognosis of this carcinoma correlates with various prognostic factors. The aim of this study was to assess the prognostic significance of expression of p53, cyclin Dl and cathepsin D protiens in association with various prognostic factors in invasive breast carcinoma. Materials and Methods: The relationship is presented between expression of p53, cyclin D1 and cathepsin D by immunohistochemistry and various established prognostic factors such as tumor size, histologic grade, lymph node status and extensive intraductal component in 55 cases of invasive breast carcinoma. Results: No significant correlations were observed between expression of p53, cyclin Dl and cathepsin D and tumor size. The expression of p53 correlated with high histologic grade. The expression of p53 and cyclin Dl correlated with lymph node metastasis. Conclusion: These results indicate that expression of p53 and cyclin Dl in invasive ductal carcinoma may be an important prognostic factor, closely related to the high histologic grade and lymph node metastasis.

Helicobacter pylori가 만성위염과 위종양에 미치는 영향에 관한 면역조직화학적 밑 초미세구조적 연구

문경래,정순봉,이미숙,이미자,서재홍,김만우,박찬국 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.2

Background and Objectives : Helicobacter pylori (H. pylori) is accepted as a principal cause of chronic gastritis and an important factor in the pathogenesis of peptic ulcer and gastric malignancy. The aim of our studies is to investigate relationships between H. pylori and gastric epithelial cells. Materials ðods : One hundred and eighty one H. pylori positive cases of gastric biopsy specimens were studied immunohistochemically and ultrastructurally. Results : p53 positive staining exhibited foveolar epithelial hyperplasia in 1 out of 32 cases, regeneration in 2 out of 12 cases, incomplete intestinal metaplasia in 5 out of 41 cases, complete intestinal metaplasia in 3 out of 18 cases, chronic ulcer in 1 out of 9 cases, tubular adenoma in 2 out of 14 cases and intestinal type of adenocarcinoma in 16 out of 21 cases. Ultrastructurally, H. pylori was observed to be in direct contact with the microvilli of the target cells and was demolishing the surface microvilli. The organisms were in close contact with the uncoated cell membrance. Penetration into the gastric cells by a few organisms was associated with marked cell damage and ultimately to cell disintegration. Conclusion : Our results suggest that H. pylori plays a role in the pathogenesis of gastric cancer, leading a relatively slow, long lasting process that induces chronic active gastritis, intestinal metaplasia, dysplasia, and adenocarcinoma of intestinal type.

Prorocentrum속에 관한 연구

문성기,이삼근,홍채규 한국환경과학회 1995 한국환경과학회지 Vol.4 No.2

Identified 7 species of the genus Prorocentrum which have been obtained from the southern coast area for 4 years from 1990 to 1994 can be summarized as followed. P.balticum is rare species, causing a red tide, and P.dentatum, P.micans, P.minimum, P.triestinum are cosmopolitan species often causing a red tide in the study area. P.gracile and P. lima are very rarely showed up, the former is recorded at first in domestic and later is benthic attached species which has diarrheic shellfish poison.

로봇설비의 작업수칙 개정을 위한 전자기적 환경 분석에 관한 연구

홍용규,김태현,문채주 木浦大學校 應用科學硏究院 2001 應用科學硏究誌 Vol.1 No.-

The electric and magnetic field mapping for the surroundings of welding robot facilities with horizontal (A section) and vertical (B section) manipulators are figured in this paper. In case of the electric field mapping with high frequency, the magnitudes on standby mode of the robots show a high level than that on operation mode. At the magnetic field mapping with low frequency, the magnitudes on operation mode indicate a high level than that on standby mode of robots. Therefore, the working rules for operation of robot facilities to secure the safety are revised as : the standby mode of welding robots has to performed with power-off and the working hours of operator on specific area with high level magnetic field should be limited to minimize the exposure.