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불연속구조물의 배치최적설계를 위한 이점역이차근사법의 개발
박영선,임재문,양철호,박경진,Park, Yeong-Seon,Im, Jae-Mun,Yang, Cheol-Ho,Park, Gyeong-Jin 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.12
The configuration optimization is a structural optimization method which includes the coordinates of a structure as well as the sectional properties in the design variable set. Effective reduction of the weight of discrete structures can be obrained by changing the geometry while satisfying stress, Ei;er bickling, displacement, and frequency constraints, etc. However, the nonlinearity due to the configuration variables may cause the difficulties of the convergence and expensive computational cost. An efficient approximation method for the configuration optimization has been developed to overcome the difficulties. The method approximates the constraint functions based onthe second-order Taylor series expansion with reciprocal design variables. The Hessian matrix is approzimated from the information on previous design points. The developed algotithms are coded and the examples are solved.
다중프로세서 시스템에 적합한 우선순위 할당 결정기법에 관한 연구
박영선,김화수,Park Yeong-Seon,Kim Hwa-Su 한국국방경영분석학회 1991 한국국방경영분석학회지 Vol.17 No.2
This paper presents the Allocation Priority Scheme (APS) for multiprocessor system. The objective of APS is to reduce the time-complexity on a Physical Mapping Scheme(PMS). The PMS is to allocate the nodes of the Data Dependency Graph (DDG) to the multprocessors efficiently and effectively. The APS provides the priority to each node (vertex) in the DDG. In other words, the goal of the APS is to find a request resource mapping such that the total cost (time-complexity) is minimized. The special case in which all requests have equal priorities and all resoruces have equal precedences, and the comparisons between our APS and other schems are discussed in the paper. The APS provides the heuristic rules which are based on maximum height (MH), number of children nodes ($N_c$), number of father nodes ($N_f$), and computation time ($T_c$). The estimation moth of the computaion time is in the paper.
기술수준 향상을 위한 R&D기획에 대한 고찰 -유기농업 분야를 중심으로-
박정규,박영선,신중훈,Park, Jung-Kyu,Park, Yeong-Seon,Shin, Choong-Hoon 한국유기농업학회 2012 韓國有機農業學會誌 Vol.20 No.2
The purpose of this paper is to suggest policy implications on the R&D planning scope to acquire highly technology quality level and to show the necessity of differentiated strategy by each technology fields in organic agriculture field. To achieve this, we analyzed the determinants of excellent R&D performance using the patent bibliography information analysis based on the count data models. Through empirical analysis, we find out that the determinants are different from each technology field, and show that these determinants should be included in the scope of R&D planning.
혈액투석 치료를 받고 있는 말기신부전 환자에서 적혈구생성인자에 치료반응이 불량한 환자들의 임상적 특징
조종택 ( Jo Jong Taeg ),박영선 ( Park Yeong Seon ) 대한신장학회 2004 Kidney Research and Clinical Practice Vol.23 No.1
목 적 : 만성신부전에 동반되는 빈혈의 주요 원인은 신장에서 생성되는 적혈구생성인자 (erythropoietin)의 결핍이다. 그러나 일부 만성신부전 환자 중에서 적혈구생성인자 투여에도 불구하고 빈혈이 개선되지 않거나 비교적 고용량을 투여하여야 반응하는 경우가 있다. 이러한 적혈구생성인자에 불충분한 반응의 원인으로 여러 요인들이 거론되고 있으나 아직 이론이 있는 부분이 있다. 따라서 본 연구의 목적은 혈액투석 치료를 받고 있는 말기신부전 환자에서 적혈구생성인자에 치료반응이 불량한 환자들의 임상소견을 분석하여 불량한 반응을 보이는데 관여하는 주요 요인들을 규명하는 것이다. 방 법 : 현재 말기신부전으로 혈액투석을 정기적으로 받고 있는 환자 81명 (연령은 52.0±11.7세, 남녀비는 41:40, 투석기간은 37.3±36.5개월, 원인신질환은 당뇨병성신증이 33%) 증에서 적혈구생성인자에 치료반응이 불량한 환자 (빈혈을 교정하기 위해서 피하 적혈구생성인자를 200 U/㎏/week 이상 필요로 하는 환자)들을 분류하고 대상환자 81명 중 적혈구생성인자 투여를 필요로 하는 환자 77명을 대상으로 헤마토크리트, 적혈구생성인자 투여량, 적혈구생성인자 저항지수 및 각종 임상적 지표들을 분석하였다. 결 과 : 적혈구생성인자에 치료반응이 불량한 환자는 20.8% (16/77)이었고, 혈청 철분, 총철분결합능, transferrin saturation (이하 TSAT로 약기함) 및 알부민 등이 통계적으로 의미있게 감소하였으며, C-반응성단백 증가 (≥0.5 ㎎/dL)가 관찰되는 경우가 의미있게 많았다 (p<0.05). 이들 가운데 혈청 총철분결합능은 적혈구생성인자 저항지수를 독립적으로 예견할 수 있었다 (R=0.44, p<0.01). 그러나 투석기간, 원인신질환, angiotensin converting enzyme (이하 ACE로 약기함) 억제제 사용 여부, 투석량 (Kt/V), 혈중 부갑상선호르몬 및 알루미늄 농도 등은 의미있는 차이가 없었다. 결 론 : 적혈구생성인자에 치료반응이 불량한 말기신부전 환자들에서 관찰되는 혈청 총철분결합능의 감소가 적혈구생성인자에 불충분한 반응을 예측할 수 있는 인자로 사료된다. Background : The main pathogenic factor causing anemia in chronic renal failure is the erythropoietin deficiency. However, there are some patients showing poor responses to erythropoietin administration. The purposes of this study were to analyze the clinical parameters of poor responders to erythropoietin among ESRD patients undergoing hemodialysis, and to clarify the major potential factors accounting for poor responses to erythropoietin therapy. Methods : Eighty-one patients with end-stage renal failure undergoing hemodialysis were included in this study. Poor responders to erythropoietin, defined as patients requiring erythropoietin doses more than 200 U/㎏/week subcutaneously to correct anemia, were identified. The hematocrit, erythropoietin dose, erythropoietin resistance index (ERI), and other clinical parameters in 77 patients requiring erythropoietin administration were evaluated and analyzed. Results : Poor responses to erythropoietin were found in 16 patients (20.8%) among 77 patients requiring erythropoietin administration. Serum iron, total iron binding capacity (TIBC), transferrin saturation (TSAT), and albumin concentration were significantly decreased (p<0.05), and increased CRP (≥0.5 mg/dL) was more frequent in poor responders (p<0.01). The independent factor affecting on ERI was TIBC (R=0.44, p<0.01). However, there were no significant difference between poor and good responders in age, gender, duration of dialysis, underlying renal disease, use of ACE inhibitor, dose of dialysis (Kt/V), serum parathyroid hormone, and aluminum concentration. Conclusion : TIBC seems to be a predicting factor accounting for poor response to erythropoietin among ESRD patients undergoing hemodialysis. (Korean J Nephrol 2004;23(1):128-137)
신 청소율 검사(Renal Clearance Study)를 이용하여 진단한 Gitelman씨 증후군 2예
기주영 ( Gi Ju Yeong ),김혜영 ( Kim Hye Yeong ),임정묵 ( Im Jeong Mug ),오광식 ( O Gwang Sig ),박영선 ( Park Yeong Seon ),권순길 ( Kwon Sun Gil ),신종성 ( Sin Jong Seong ),김미성 ( Kim Mi Seong ),지정훈 ( Ji Jeong Hun ),엄재호 ( E 대한신장학회 2001 Kidney Research and Clinical Practice Vol.20 No.6
We have experienced two patients who had hypokalemic metabolic alkalosis as well as hypomagnesemia and hypocalciuria with elevated plasma renin activity. We have performed renal clearance study after water loading, administration of furosemide and thiazide in two patients and two normal controls. Maximal free water clearance per 100 mL glomerular filtration rate(C_(H2O) ) and distal fractional chloride reabsorption[ C_(H2O) /(C_(H2O) +C_(Cl))] in our patients were reduced than the controls. Chloride clearance(C_(Cl)) was increased after furosemide administration but not after thiazide administration. Distal fractional chloride reabsorption[C_(H2O) /(C_(H2O) +C_(Cl))] was dramatically decreased by furosemide administration in our patients, whereas thiazide had little effect on it. Fractional excretion of sodium, chloride, magnesium, calcium was increased by furosemide administration, whereas thiazide administration had little effect on this parameters. These findings suggested the presence of a defect in the distal convoluted tubule rather than in the thick ascending loop of Henle. Herein, we report two cases of Gitelman`s syndrome diagnosed by renal clearace study after water loading, administration of furosemide and thiazide.