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그로벌최적화 문제인 유효해집합위에서의 최적화 문제에 대한 선형계획적 접근방법
송정환 한국경영과학회 2000 한국경영과학회 학술대회논문집 Vol.- No.1
그로벌최적화문제(Global optimization problem)의 부류인 다목적선형계획법(MOLP)(Multiple objective linear programming)에서 결정된 유효해집합(a set of efficient solutions)위에서 선형함수 최적화문제(P)는 해집합이 불록집합이 아니므로 (nonconvex set) 일반적인 선형계획법을 활용하기가 어렵다. 현재까지 (P)의 최적화를 위해서 유효해집합의 모든 꼭지점 (extreme point)를 찾거나 일련의 선형 계획문제들을 최적화 하여 최적해를 찾는 접근방법들이 있다. 이러한 방법들에는 (MOLP)의 해집합의 차원(dimension)이 커짐에 따라 문제해결이 실제적으로 가능하지 않는 경우가 많다. 본 연구는 주어진 섬형함수와 다목적 선형함수들간 관계를 고찰하여 선형목적함수를 구성하고 그 목적함수를 이용하여 주어진 문제 (P)의 최적해를 찾는 선형계획적 접근방법을 제안한다. The problem ( P ) of optimizing a linear linear function * over the set of efficient set for a multiple objective linear profram ( M ) is difficult because the efficient set is nonconvex. There are some interesting properties between the objective linear vector * and those properties lead us to establish criteria to solve ( P ) with linear program. In this paper we investigate a system of the linear equations *=* and construct two linearly independent positive vectors *,* such that *=*-*. From those vectors *,*, solving an weighted sum linear program for finding an dfficient extreme point for the ( M ) is a way to get an optimal solution ( P ). Therefore our theory gives an easy way of solving nonconvex program ( P ) with a weighted sum linear program.
PLD 법에 의한 c-사파이어 기판위의 MnS 박막성장
송정환,Song, Jeong-Hwan 한국재료학회 2007 한국재료학회지 Vol.17 No.9
Pulsed laser deposition was utilized to grow MnS thin films on c-sapphire substrate using a KrF excimer laser at growth temperatures that ranged from room temperature to $700^{\circ}C$. The results of X-ray diffraction (XRD) and UV-visible spectroscopy were employed to investigate the structural and optical properties of the MnS films. While the growth rate decreased as $T_s$ increased, the overall quality of the film improved. The highest quality MnS film was obtained at $700^{\circ}C$. Variations in the $T_s$ resulted in the MnS films exhibiting different growth mechanisms. The oriented (200) rocksalt MnS film was grown at room temperature. In the case of higher $T_s,\;200{\sim}500^{\circ}C$, the films consisted of mixed phases of rocksalt and wurtzite. The main structure of the films was altered to (111) rocksalt when the temperature was increased to in excess of $600^{\circ}C$. This behavior may very well be the result of elements such as surface energy and atomic arrangement during the growth process. The optical band gap of the obtained ${\alpha}-MnS$ film was estimated to be 3.32 eV.
송정환,윤영민,최귀철,이용덕,정지훈,이경갑 한국임상수의학회 2012 한국임상수의학회지 Vol.29 No.6
This study was conducted to survey red blood cell (RBC) antigens Aa, Ca and Qa types, which are considered to be the most significantly associated with occurrence of neonatal isoerythrolysis, and the results are expected to provide valuable informations in organization of breeding plan, hence preventing the disease. Blood samples were collected from 262 Thoroughbred horses in Jeju island. Two percent cell suspension has been prepared from each sample and they were tested by indirect antiglobulin test. Of the 226 mare's samples, 9(3.98%) were Aa negative, 8(3.54%) were Ca negative, 17(7.52%) were Qa negative. Of the 36 Stallion's samples, 1(2.78%) was Aa negative, 3(8.33%) were Ca negative, 3(8.33%) were Qa negative. On the basis of these data, a database for breeding compatability could be set, and it would play an important role as a reference for arranging the mating partners.
비강내 국소 에스트로겐으로 치료한 유전성 출혈성모세혈관확장증 1예
송정환,김현준,윤용로,김윤태 대한이비인후과학회 2006 대한이비인후과학회지 두경부외과학 Vol.49 No.4
Hereditary hemorrhagic telangiectasia is an autosomal dominant disorder affecting blood vessels of the skin, mucous membrane and viscera. It is characterized by a clinical triad of multiple telangiectasia, recurrent hemorrhages and familial occurrence. In 80% of patients, epistaxia is the first presenting symptom. It can have a massive impact on the quality of life of those affected. Otolaryngologists should be familiar with this disease because of its potential systemic complication. Recently, we have experienced a 69 year old female complaining of melena and recurrent epistaxis for 20 years. Epistaxis was successfully managed with topical estrogen ointment. (Korean J Otolaryngol 2006;49:447-50)
저온 동시소결을 위한 Ni-Zn-Cu 폐라이트와 Pb(Fe<sub>1/2</sub>Nb<sub>1/2</sub>)O<sub>3</sub>에서의 열적 거동 및 계면층 특성
송정환,Song, Jeong-Hwan 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.10
In order to apply a complex multilayer chip LC filter, this study has estimated the interfacial reaction and coupling properties of dielectric materials $Pb(Fe_{1/2}Nb_{1/2})O_3$ and Ni-Zn-Cu ferrite materials through low-temperature co-sintering (LTCS). PFN powders were fabricated using double calcinated at $700^{\circ}C$ and then $850^{\circ}C$. While the perovskite phase rate was found to be 91 %, after heat treatment at $900^{\circ}C$ for 6h, the perovskite phase rate and density exhibited a value of 100 % and 7.46$g/cm^3$, respectively. The PFN/Ni-Zn-Cu ferrite, PFN/CUO (or $Pb_2Fe_2O_5$) and ferrite/CuO (or $Pb_2Fe_2O_5$) were mechanically coupled through interfacial reactions after the specimen was co-sintered at $900^{\circ}C$ for 6 h. No intermediate layer exists for the mutual coupling reaction. This result indicates the possibility of low-temperature co-sintering without any interfacial reaction layer for a multilayer chip LC filter.
송정환,이경식,Song, Jeong-Hwan,Lee, Kyung-Shik 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.7
다양한 수소처리 조건에 의하여 수소 처리된 광섬유에 광섬유 격자를 제작하여, 광섬유 코어 내에 포화된 수소분자 농도와 광섬유 격자의 굴절률 변화폭(photoinduced index modulation)과의 관계를 분석하여 보았다. 실험으로 측정된 광섬유 결자의 굴절률 변화폭은 코어 내에 수소분자 농도가 100ppm 증가함에 따라서 ${\sim}2{\times}10^{-5}$만큼 증가하였다. 그리고 광감도현상에 관여하는 전체결함, 즉 GeE' 센터와 GeH결함은 포화된 수소농도 100ppm 당 대략 $3.8{\times}10^{17}/cm^3$ 만큼 많아지는 것으로 추정된다. The relationship between calculated hydrogen molecular concentration in fiber core and measured index change during the grating growth is analyzed. The index change increases by ${\sim}2{\times}10^{-5}$ per 100ppm of $H_2$ concentration in standard telecommunication optical fiber and the defects related photosensitivity generate ${\sim}3.8{\times}10^{17}$ per 100ppm of $H_2$.