전리수에서의 STS304의 부식

이종권,박소연,김범식 순천향대학교 산업기술연구소 2006 순천향 산업기술연구소논문집 Vol.12 No.1

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AISI 316 스테인리스강의 크리프-피로 상호작용시 수명예측에 관한 연구

권영일,김범준,임병수 成均館大學校 科學技術硏究所 2000 論文集 Vol.51 No.2

The effect of tensile hold time on the creep-fatigue interaction in AISI 316 stainless steel was investigated. To study the fatigue characteristics of the material, strain controlled low cycle fatigue(LCF) tests were carried out under the continuous triangular waveshape with three different total strain ranges of 1.0%, 1.5%, and 2.0%. To study the creep-fatigue interaction, 5 min., 10 min., and 30 min. of tensile hold times were applied to the continuous triangular waveshape with the same three total strain ranges. The creep-fatigue life was found to be the longest when the 5 min. tensile hold time was applied and was the shortest when the 30 min. tensile hold time was applied. The cause for the shortest creep-fatigue life under the 30 min. tensile hold time is believed to be the effect of the increased creep damage per cycle as the hold time increases. Under the total strain range of 1%, significant reduction in life was observed as the tensile hold time was increased compared to the result of 2% total strain range. The theoretical prediction obtained by the Modified Coffin-Manson method and the experimental results of creep-fatigue life were found to be in resonable agreement with each other.

52 Mbps급 CAP 전송시스템의 모델링과 성능분석

권호열,전진화,김범규 강원대학교 정보통신연구소 1998 정보통신논문지 Vol.2 No.-

Carrierless Amplitude Modulation/Phase Modulation(CAP) has the same spectral characteristics and provides the same theoretical performance as QAM, but is generally less complex to implement digitally. In this paper, a 52 Mbps CAP transceiver system is modeled and simulated according to DAVIC VDSL standard. Also we analyzed error rate characteristics under AWGN channel by using MATLAB.

組織沒入의 影響變數와 過程模型에 관한 硏究

金範國,康承權 濟州大學校 觀光産業硏究所 1990 産經論集 Vol.4 No.-

The purpose of this thesis is to formulate a theoretical system on organizational commitment and to lay the foundation of empirical study hereafter. I made a historical survey of the researches on organizational commitment, examining factors affective on organizational commitment. I inquired into several process models that the previous researches lay out to explain the way employees got lost to the organizational commitment, suggesting an integrative organizational commitment model. These may be summarized as follows; 1. Each researcher gives different definitions on organizational commitment. But most researchers follow porter et al's definition. Namely, organizational commitment refers to the relative strength of an individual's identification with and involovement in a particular organization, and this consists of the following three structural elements. (a) a person's strong belief in and an acceptance of the organizations goals, (b) a person's willingness to exert considerable effort on behalf of the organization, and (c) a person's definite desire to maintain membership. 2. Each research also has a different opinion on the factors affective on organizational commitment. Several researchers are studying by setting up anticidents and outcomes or moderated variables. 3. In view of a process model that may illustrate how employees reach to the organizational commitment, I have examined not only R. H. Steer's models but also other organizational commitment process models proposed by a number of researchers. Therefore, this thesis presented an integrative organizational commitment model, by adding or substracting some variables on the basis of the results of the previous researches. We should admit that the validity of this research must be attested through empirical researches.

풍선확장술 직후 시간경과에 따른 혈관의 변화 : Intravascular Ultrasound Balloon Catheter

김동수,장양수,권혁문,홍범기,김현승 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.2

유지시간 변화에 따른 크리프-피로 수명예측 방법에 관한 연구

권영일,김범준,임병수 成均館大學校 科學技術硏究所 2001 論文集 Vol.52 No.2

In this study, creep-fatigue tests were carried out under the various test conditions using AISI 316 stainless steel. Life prediction was made by three different methods which are the modified Coffin-Manson method, the modified Ostergen method and the artificial neural network method with the adaptive learning rate. The predicted lives were compared with the experimental results and following conclusions were obtained within the scope of this study. Creep-fatigue life prediction by the modified Coffin-Manson method and the modified Ostegren method had the average error of 47.3% and 50.8% respectively whereas the artificial neural network method had only 28.8% for compressive and tensile+compressive hold time. From the obtained results, the artificial neural network method with the adaptive learning rate was proved to be more accurate and effective than the other two methods. The validity of artificial neural network method for life prediction checked with 3 verification data points proved also to be very satisfactory.

실내사무환경의 환경성담배연기(ETS)의 지표물질에 관한 연구

하권철,백남원,박동욱,윤충식,김원,최상준,박지영,최인자,김신범,강태선 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.2

The purpose of this research is to evaluate indoor office environment using the concentrations of nicotine, 3-enthenyl-pyridine(3-EP), and respirable suspended particulate(RSP), which are indicators for environmental tobacco smoke(ETS) and the correlations between indicators and environmental conditions(smoking density, smoking index). The mean air charge per hour (ACH) in smoking rooms was 10.4 and most of the smoking rooms showed non-compliance withe ASHRAE standard value except only one smoking rooms. The concentrations of RSP, 3-EP, nicotine showed log=normal distributions, and became different statistically depending on smoking condition(p〈0.01). The geometric mean concentration of RSP in smoking room was 441.7 ug/㎡ that is far exceeded environmental standard(150 ug/㎡). This implies that fine particulate in smoking room should be carefully controlled considering smoking density and ventilation fate. The mean concentrations of nicotine and 3-EP were 93.4 ug/㎥, respectively. The correlation coefficients between RSP and SI, 3-EP and SI, and Nicotine and SI were 0.67, 0.84 and 0.74, respectively. The correlation coefficient between nicotine and 3-EP, nicotine and RSP, and RSP and 3-EP were 0.76,0.78 and 0.57 respectively.

隔板을 가진 水平環狀空間에서 自然對流에 관한 實驗的 硏究

鄭泰鉉,金善政,李範澈,權純錫 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2

Natural convection from a horizontal annulus with spacers has been studied on the effects of Rayleigh numbers and position of spacers by experimental method. In case of vertical spacers, the maximum local Nusselt number appears at θ=150° in a conducting tube and θ=30° in a cylinder. The local spacer Nusselt numbers show positive values on the lower spacer, but negative values on the upper spacer. In case of horizontal spacers, the flow over the spacer is more active than that of under the spacer as the Rayleigh number increase. The maximum local Nusselt number appears at θ=180° In a tube and at θ=0° in a cylinder. The local spacer Nusselt number show positive values on the upward surface of spacer, but negative values on the downward surface of spacer. The mean tube Nusselt numbers and mean cylinder Nusselt numbers with vertical spacer are increased 11% And 2.7%, respectively by those of horizontal spacer.

20km와 150km의 도로싸이클 주행이 혈중 렙틴, 지질과 호르몬 수준에 미치는 영향

최용어,권봉안,오재근,김범수,조준용,김문희 한국체육대학교 체육과학연구소 2000 韓國體育大學校附屬 體育科學硏究所論文集 Vol.19 No.1

Serum leptin, glucose, lipid profiles (free fatty acid, triglyceride, total cholesterol) were determined in two groups of subjects undergoing long and short strenous cycle race, 8 men who fasted overnight and then pedaled 20km cycle race and 8 men, 150km cycle race, respectively, Blood samples were collected before race, immediately after cessation of race and 2hr, 6hr after the end of race period. Cyclist pedaling 20km cycle race and cyclist pedaling 150km cycle race showed no statistical differences in leptin level. After 6hr of rest, leptin concentrations were gradually decreased but showed no statistical different in both groups. Epinephrine (p〈.01) and norepinephrine (p〈.001) concentration in comparison to pre-race levels were increased significantly. But insulin concentration in comparison to pre-race levels were decreased significantly (p〈.001). Glucose (p〈.01), free fatty acid (p〈.001), cholesterol (p〈.001) and triglyceride (p〈.01) were increased immediately after cessation of race in both groups.

산업공단에서의 초기강우 유출수 오염물질 특성 및 처리

신응배,윤현식,김연권,김범수 漢陽大學校 環境工學硏究所 1998 環境科學論文集 Vol.19 No.-

강우시 발생하는 우수유출수에는 초기세척효과(first-flush-effect)로 BOD, SS를 비롯한 고농도의 다양한 오염물질이 함유되어 있으며, 방류선 수체로 유입되어 주변수체의 수질에 많은 악영향을 미치게 된다. 전세계적으로 이에 대한 많은 연구와 조사가 진행중에 있으며, EPA의 조사자료에 따르면 방류선 수체의 수질오염 문제 중 약 30%가 강우유출수로부터 기인하는 것으로 추정한바도 있다. 본 연구에서는 수도권에 인접해 위치하고 있는 S산업공단을 대상으로, 강우시 공단내에서 발생하는 우수유출수에 대해 유량변화 및 수질분석을 수행하였다. S공단은 석유·화학, 기계·금속업 등이 주종을 이루고 있고 분류식하수 배제방식을 채택하고 있어, 공단내 발생되는 우수유출수는 전량 지천으로 배출되고 있다. 시료채취는 공단을 배수구역별 5개 구역으로 구획 후, 해당 배수구역에 대하여 고정모니터링 방법을 적용하여 강우유출수의 수질을 분석·평가하였다. S산업공단에서 발생되는 우수유출수에는 BOD, COD, SS, TN, d-Fe, Zn, Cu 등의 다양한 종류의 오염물질이 검출되었다. 특히, 석유·화학산업, 식품산업, 일반폐기물 야적장 등에서는 BOD, COD, SS, TN등의 일반오염물질 항목들이, 기계·금속산업, 고철 야적장 지역에서는 중금속 항목의 오염물이 고농도로 측정되었다. During the early stages of a storm, significantly higher BOD, SS and other pollutants loadings may occur. This temporary increase is the result of the so -called "first-flush-effect". First flush runoff in the storm is a typical nonpoint source of polluting adjacent water bodies by overflowing pollutants accumulated in street surface from domestic, commerical and industrial area. The quality of storm water runoff is a major concern in the world. In the National Water Quality Inventory, 1990 Report to Congress, states estimated that ∼30% of identified case of water quality impairment are attributable to storm water discharges. (U.S. EPA 1992) In this study, "S" industrial complex located near Seoul metropolitan was investigated to evaluate characteristics of storm water runoff from industrial complex. Major industries of 'S' area were petroleum-chemical industry, metal-mechanical industry, etc. Also, storm water runoff was directly discharged to small artificial channel through storm sewer lines of separated sewer system in 'S' industrial complex. The concentration of several items such as BOD, COD, SS, TN, d-fe, Zn, Cu were founded in storm water runoff from the 'S' industrial complex catchment. Especially, petroleum-chemical industry, food industry, junkyard were exposed to high rate concentration of convention of conventional pollutants, such as BOD, COD, SS, TN, in first flush runoff samples. Higher levels of heavy metals were found at metal-mechanical industry, metal storage on site.