최적 표준칫수 결정에 관한 연구

강준모,박영택 成均館大學校 科學技術硏究所 1989 論文集 Vol.40 No.2

This paper studies the problem of determining the optimal standard product sizes minimizing the loss function, which is composed of demand distribution and preference functions. The customer who wants to buy the product of size x in the range x_(i-x)<x<x_i may purchase the product of size u_i. Size u_i represents the standard product size which covers the interval (x_(i-1), x_i). Purchasing desire decreases as the difference between a customer's requirement(x) and the standard product size(u_i) increases. The standard product sizes u_i and the range limits x_i can be determined so as to minimize the loss function.

점농어(Lateorabrax sp.)의 종묘생산에 관한연구 1. 稚魚期에 있어서 成長과 生存에 미치는 염분의 영향

박준택,한경호 麗水大學校 産業基術硏究所 1999 産業基術硏究所 論文集 Vol.8 No.-

점농어 稚魚(孵化後 150일째)의 염분 농도별 실험구(A : 30‰, B : 20‰, C : 10‰, D : 0‰)에서의 성장율과 생존율은 다음과 같다. 부화 150일루 稚魚들을 각각의 염분 농도에 수용하였을 때 수용 수 50일째까지는 고염분에서 성장이 다소 빨랐으나, 수용 후 60일째 부터는 담수와 저염분의 실험구에서 성장이 매우 양호하였다. 각 염분별 사육일수 (X)에 따른 전장(Y)과의 회귀직선식은 다음과 같다. 30‰ 실험구 : Y = 20.26X + 57.20 (r=0.9799), 20‰ 실험구 : Y = 19.74X + 57.82 (r=0.9825), 10‰ 실험구 : Y = 20.80X + 56.34 (r=0.9823), 담수(0‰) 실험구 : Y = 21.43X + 54.71 (r=0.9845). 염분 농도를 달리하여 사육하였을 때 生存率은 수용 초기에는 담수 실험구에서 生存率이 떨어졌으나, 수용 후 50일째부터는 오히려 담수 실험구에서 生存率이 높았으며, 수용 후 90일째부터는 生存率이 86.0∼91.0%로 실험구별로 큰 차이는 없는 것으로 나타났다. 각 실험구간의 기울기에 유의성 검정결과 담수(0‰) 실험구와 10‰, 20‰실험구 및 30‰실험구 사이에는 유의한 차이가 있었다. This study was conducted to compare the growth and survival rates of spotted sea bass, Lateorabrax sp., juveniles in different salinities (0‰, 10‰, 20‰, 30‰). The growth rate of sea bass juveniles were not observed significant difference in all test group until 50 days after rearing. After that, However rate of sea bass juveniles in low salinity was higher than the high salinity. The relationship between the days of rearing (X) and the total length (Y) of the fingerlings were as follows : 30‰ treatment group : Y = 20.26X + 57.20 (r=0.9799), 20‰ treatment group : Y = 19.74X + 57.82 (r=0.9825), 10‰ treatment group : Y = 20.80X + 56.34 (r=0.9823), 0‰ treatment group : Y = 21.43X + 54.71 (r=0.9845). The slopes of regression line estimated from 0‰, 10‰ and 20‰groups were significantly different from that of 30‰ group. Survival rate of sea bass juveniles was fall down slightly at low salinitly () until 50 days after rearing. But significant difference of survival rate was observed in all test group from 90 day after rearing to the end of experimental period.

韓國 醫療 서어비스 QC 活性化 方案 : K病院 事例를 中心으로

金俊鎬,鄭禹澤 청주대학교 산업경영연구소 1988 産業經營硏究 Vol.10 No.1

5세 된 유전성 구상 적혈구증 환아에서 폐쇄성 황달을 동반한 다발성 담석증 1례

민택기,이인규,박경배,박준수 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Hereditary spherocytosis is a common cause of hemolysis and hemolytic anemia. Some children remain asymptomatic into adulthood but others may have severe anemia with pallor, jaundice and fatigue. After infancy, the spleen is usually enlarged, and pigmentary gallstones may form as early as age 4~5 year. But it increases abruptly after age 10 year. At least 50% of unsplenectomized patients ultimately form gallstones, although for the most part they remain asymptomatic. We report herewith a case of multiple gallstone with obstructive jaundice in 5 years old patient with hereditary spherocytosis.

담즙정체성 간염의 임상적 양상

최선택,은종렬,임상우,김봉준,이헌주,구미진,최준혁 영남대학교 기초/임상의학연구소 2001 Yeungnam University Journal of Medicine Vol.18 No.1

Background: Cholestatic hepatitis is failure of bile to reach the duodenum with hepatocellular damage and no demonstrable obstruction of the major bile ducts. The prognosis is usually good with recovery in less than 4 weeks after withdrawal of the offending drug. However, a prolonged course lasting over 3 months is possible and, in rare cases, progression to ductopenia with development of a vanishing bile duct syndrome occurs. A differential diagnosis with other causes of Chronic liver disease is needed. Materials and Methods: From January 1991 through Jaunary 2000, 14 patients diagnosed as cholestatic hepatitis by liver biopsy were inclouded. The possible causative drug, clinical features, laboatory findings, and progression of cholestatic hepatitis were evaluated. The semiquantitative study of liver lesions was performed by two independent observers. Results: Causes of cholestatic hepatitis are 5 cases of oriental medicine, 3 cases of anti-tuberculosis medication, 1 case of ticlopidine and antibiotics and 4 cases of unknown causes. The clinical features of cholestatic hepatitis were jaundice, itching, urine color change, and general weakness. During 6 to 30 months, LFT of 5 patients showed prolonged elevation. Elevated total cholesterol ≥250 mg/dL in 6 patients, pheripheral blood eosinophilia in 5 patients, auto-antibody positive in 6 patients were observed respectively. The biopsies showed intralobular bilirubinostasis with a mixed portal inflammatory infiltration. Conclusion: In cholestatic hepatitis. durations of abnormal LFT are variable regardless of causative drugs. If cholestatic hepatitis progresses toward chronic course, viral hepatitis, primary biliary cirrhosis, and autoimmune hepatitis should be differentially diagnosed and sequential liver biopsies are needed.

졸-겔법에 의한 Mullite 코팅막의 제조 및 특성에 관한 연구

이용택,최영우,양중식 慶熙大學校 材料科學技術硏究所 1997 材料科學技術硏究論集 Vol.10 No.-

출발원료로 알루미늄 세크 부톡사이드(ASB)와 테트라 에톡시실란(TEOS)을 사용하는 졸-겔법에 의해 뮬라이트 조성의 졸 용액을 제조하고, 지지체 표면위에 침지 시간의 변화에 따라 코팅을 실시하였다. 그 결과 뮬라이트 결정화를 위해서는 1,300℃이상의 열처리 조건으로 균열 없는 뮬라이트 코팅막을 제조하는 것이 가능하였으며 침지시간에 따라 코팅막의 두께가 선형적으로 증가하고 평균 기공의 크기는 20∼30Å까지 기공 제어가 가능하였다. Optimal Mullite sol was synthesized by sol-gel process using Aluminium sec-butoxide(ASB), Tetraethoxy-silane(TEOS) and then, Mullite films were dip-coated with various holding time in sol bath and heat-treated at 1300℃ above for crystallization. The thickness of coated film increased linearly with holding time in sol bath and average pore size was controllable within 20-30Å.

장기간 혈액투석을 받는 말기 신부전환자의 정서상태 및 투석 순응도에 대한 연구

이준노,김창현,권택술 大韓神經精神醫學會 1995 신경정신의학 Vol.34 No.4

The purpose of this study is to evaluate the relationship between compliance of patients under hemodialysis and their affective states of depressed mood and anxiety. Subjects consist of 58 end-stage renal failure patients on the long-term hemodialysis of one year or longer. Depressed state was evaluated with Beck Depression Inventery(BDI) and anxiety state was assessed with Self-rating Antiety Scale(SAS). The compliance in terms of diet, medication and fluid was assessed with Potassium(K), Phosphorus(P) and Interdialytic Weight Gain(IWG), respectively. the primary findings are as noted below. 1) 58.6% of the subjects felt depressed, but anxiety level was quite within normal range. 2) There were no intercorrelations between the compliance parameters of diet, education and fluid intake. preliminary correlations are as follows. The level of depression correlated with that of anxiety. Educational level is correlated negatively with scores of depression and anxiety. Duration of marriage is correlated positively with scores of depression. 3) Only anxiety, not depression, correlated with IWG, when controlled for age, sex and other clinical variables. But, anxiety did not correlate with K and P. This result may suggest that IWG is a more sensitive indicator of compliance than K and P.

주택건설현장 폐 콘크리트 발생 저감 식스시그마 프로젝트 추진 사례 : a Six Sigma Project for Decreasing Waste Concrete in a Housing Construction Site

권혁무,김정택,최준호 한국품질경영학회 2000 품질혁신 Vol.1 No.1

본 사례는 국내 APT 건설 현장에서 수행된 식스시그마 프로젝트에 대한 것으로 페콘크리트 발생 저감 및 잔량발생에 영향을 미치는 주요 인자들을 파악하고 개선안을 도출하는 과정을 보였다. 프로젝트는 식스시그마의 방법론을 따라 정의, 측정, 분석, 개선, 관리의 절차에 따라 주요 변수를 규명하고 개선안을 찾아내는 식으로 진행되었다. 분석결과 페콘크리트 발생을 줄이기 위해서는 첫째, 거푸집 시공 및 타설 프로세스를 개선하고 둘째, 압송관 및 펌프카 내 잔여 레미콘을 최소한으로 감소시키며 셋째, 최종적으로 남은 레미콘을 재활용할 수 있도록 하는 세가지로 요약되었다.

원전 체크밸브 진단기법 개발을 위한 음향방출기법 및 신경회로망 적용에 관한 연구

이민래,이준현,최상우,김정택,김정수 한국비파괴검사학회 2004 학술대회 논문집 Vol.- No.-

This work performed in support of the International Nuclear Energy Research Initiative(INERI) program, which was to develop and demonstrate advanced sensor and computational technology for on-line monitoring of the condition of components, structures, and systems in advanced and next-generation nuclear power plants(NPPs). The primary objective of this work is to investigate advanced condition monitoring systems based on acoustic emission detection that can provide timely detection of check valve degradation and service aging so that maintenance/replacement could be preformed prior to loss of safety function. The research is focused on the capability of AE technique to provide diagnostic information useful in determining check valve aging and degradation, check valve failures and undesirable operating modes. This work also includes the study to detect failure in check valves using neural networks.

대장-직장암에서 Cyclooxygenase-2의 발현

강원경,천준성,장세진,조현민,천성원,안창혁,오승택 대한대장항문학회 2004 Annals of Coloproctolgy Vol.20 No.2