http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
본차이나 소지용 인산칼슘 분말의 제조 및 적용에 관한 연구
김윤성,김준이,유중환,김형태,Kim, Yun-Sung,Kim, Juny,Yoo, Jung-Whan,Kim, Hyung-Tae 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.12
Calcium phosphate powders have been prepared by using $Ca(OH)_2\;and\;H_{3}PO_4$ solution under various conditions such as pH, calcination temperature, and reaction time. ${\beta}-TCP({\beta}-tricalcium phosphate)$and HAp(hydroxyapatite) were synthesized at pH=5.21 and pH > 7.62, respectively. From XRD results, $Ca(OH)_2\;and\;H_{3}PO_4$ solution reacted quickly to form HAp, which was structurally stable up to 16h. Calcination temperature having good crystallinity is revealed to be at $1200^{\circ}C$. SEM analysis showed that ${\beta}-TCP$ and HAp with needle type were synthesized at pH 5.21 and pH 7.62, respectively. However, at pH 9.16, tiny and homogeneous HAp having sphere was prepared and rearranged to show needle morphology. HAp synthesized at pH 9.16 was utilized as bonechina body and calcined. The sample was analyzed its crystallinity, water absorbtion, color, and shape to check physical properties. 수용액의 pH, 소성온도, 반응시간 등을 변화한 조건하에서 $Ca(OH)_2$와 $H_{3}PO_4$ 수용액을 이용하여 인산칼슘계 화합물을 제조하였다. 산성분위기(pH=5.21)에서는 ${\beta}-TCP({\beta}-tricalcium phosphate)$가, pH>7.62에서는 HAp(hydroxyapatite)가 주 결정상으로 관찰되었다. XRD 분석결과, $Ca(OH)_2$와 $H_{3}PO_4$는 빠르게 반응(5분이내)하여 HAp를 생성하였고, 반응 16시간까지 안정적으로 구조를 유지하였다. 우수한 결정성을 나타내는 소성온도는 $1200^{\circ}C$로 관찰되었다. 주사전자현미경(SEM)에 의한 미세구조 관찰 결과, pH가 5.21일 경우 침상 형태의 ${\beta}-TCP$ 입자가, pH 7.62에서는 침상 형태의 HAp가 합성되었다. 그러나 pH 9.16에서는 매우 작고 균일한 구형의 HAp 입자들이 생성되었고, 다시 작은 입자들이 침상으로 재배열된 형상을 관찰할 수 있었다. 합성된 HAp(pH 9.16)를 본차이나 소지에 일정량 혼합하여 본차이나 물성, 즉 결정성, 흡수율, 색도, 파단면의 형상을 측정${\cdot}$분석하였다.
김윤성,정용재,Kim, Yun-Sung,Chung, Yong-Chae 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.5
본 연구에서는 PVD 공정으로 Si 양자점 형성시 증착조건의 변화가 증착된 양자점 크기와 분포에 미치는 영향을 Monte Carlo법을 응용한 전산모사를 통하여 정량적으로 분석하였다. 전산모사시 PVD 공정에서 일반적으로 제어가 가능한 기판온도, 증착시간, 가스압력과 타겟-기판거리를 공정변수로 선택하였다. 계산 겨로가 증착속도가 0.05 nm/sec이고 기판온도 490${\circ}$, 증착시간 7 sec, 가스압력 3 mTorr, 타겟-기판거리가 8 cm일때 증착 밀도가 $1{\times}10^{12}cm^{-2}$인 Si 양자점 형성이 가능할 것으로 예측되었다. In this study, the effect of the processing parameters in PVD process on the size and the distribution of deposited Si quantum dots was quantitatively investigated by computational simulation utilizing Monte Carlo method. The processing parameters, substrate temperature, deposition time, gas pressure and target-substrate distance were selected as variables since those parameters are often selected as variables in PVD experiments. It is predicted that the density of $1{\times}10^{12}cm^{-2}$ Si quantum dots can be deposited on the substrate when the deposition rate is 0.05 nm/sec at the substrate temperature of 490${\circ}$, deposition time of 7 sec, gas pressure of 3 mTorr and target-substrate distance of 8 cm.
임의형태의 장애물 경계정보를 이용한 최소거리 우회경로 탐색 알고리즘
김윤성,박수현,Kim, Yun-Sung,Park, Soo-Hyun 한국시뮬레이션학회 2010 한국시뮬레이션학회 논문지 Vol.19 No.4
Currently used shortest path search algorithms involve graphs with vertices and weighted edges between each vertex. However, when finding the shortest path with a randomly shaped obstacle(an island, for instance) positioned in between the starting point and the destination, using such algorithms involves high memory inefficiency and is significantly time consuming - all positions in the map should be considered as vertices and every line connecting any of the two adjacent vertices should be considered an edge. Therefore, we propose a new method for finding the shortest path in such conditions without using weighted graphs. This algorithm will allow finding the shortest obstacle bypass given only the positions of the obstacle boundary, the starting point and the destination. When the row and column size of the minimum boundary rectangle to include an obstacle is m and n, respectively, the proposed algorithm has the maximum time complexity, O(mn). This performance shows the proposed algorithm is very efficient comparing with the currently used algorithms.
김윤성(Yun-Sung Kim),서기봉(Ki-Bong Seo),이용화(Yong-Hwa Lee),백병덕(Byung-Dug Baeg) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper reports the case that unitizes heat analysis simulation in housing design of DC-DC converter. Icepak4.3 is used for heat analysis simulation program. 1.5㎾ prototype is produced with base of finally selected structure through simulation and is compared heating characteristic. Propriety of development application is confirmed through the result, shortening case of development cost and period is introduced.
쌍롤 연속주조 알루미늄 합금 압연 판재의 브레이징 열처리 시 재결정 조직에 미치는 중간 어닐링 온도 및 최종 압연율의 영향
김윤성 ( Yun Sung Kim ),권해욱 ( Hae Wook Kwon ),박종우 ( Jong Woo Park ),김동진 ( Dong Jin Kim ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.4
This study investigated the effects of intermediate annealing temperature and final reduction ratio on the recrystallization structure of a twin-roll continuous cast and cold rolled Al alloy after brazing heat treatment. The grain structure after brazing heat treatment of the intermediate-annealed specimen at a lower temperature of 410℃ was coarser than that at a higher temperature of 470℃. The dispersoids of nanometer size particles, which had been absent in the as-cast specimen, were precipitated during the intermediate annealing and significantly influenced the recrystallized grain structure during brazing heat treatment. Even though the grain size of the specimen rolled with a lower final reduction ratio of 30% was a little finer than that with a higher one of 40% after the intermediate annealing, the former was much coarser than the latter after the brazing heat treatment.
유리체강내 Fluocinolone Acetonide Implant 삽입 후 호전된 베체트 포도막염 1예
김윤성 ( Yun Sung Kim ),최정란 ( Jung Ran Choi ),김석원 ( Seok Won Kim ),김현숙 ( Hyun Sook Kim ) 대한류마티스학회 2013 대한류마티스학회지 Vol.20 No.2
베체트병에서 눈은 가장 흔하게 침범되는 장기 중 하나로, 포도막염, 모양체염, 홍채모양체염, 망막염, 낭포황반 부종 등과 같은 다양한 형태로 발현된다. 재발성 포도막염에서 전신적 스테로이드와 면역억제제의 장기간 사용은 약제 부작용을 유발할 수 있고, 안구 내 스테로이드 주사는 안압의 상승, 백내장이 나타날 수 있다. 저자들은 반복적인 베체트 포도막염으로 이미 좌안이 실명된 환자에서 triamcinolone, MTX의 안구 내 주사, 전신적 스테로이드를 포함한 면역 억제제 투여에도 우안의 전체포도막염이 지속되어 fluocinolone acetonide implant를 유리체강내 이식하여 포도막염의 지속적인 치료와 함께 시력의 호전을 경험 하였기에 문헌고찰과 함께 증례 보고하는 바이다. Beh?et`s disease (BD) is systemic vasculitis that can manifest severely debilitating. Despite the understanding mechanisms of overall BD, there are remains many questions in various critical manifestations and treatments. The ocular manifestation is characterized by a prototype of chronic relapsing and persistent uveitis. The main treatment is topical corticosteroid, and topical nonsteroidal anti-inflammatory drugs in mild uveitis. The recurrent and severe uveitis could be treated with ocular corticosteroid injections, and systemic corticosteroid for inducing long-lasting suppression of the inflammation. Systemic corticosteroids should rapidly be tapered within weeks for avoiding side effects. Recent advances have led to the development of sustained-release corticosteroid devices using different corticosteroids. We present a case of 67-year-old woman who received a fluocinolone acetonide implant for recurrent Beh?et`s uveitis. She was successfully treated with implant and the uveitis became quiescent within a month.
PFC용 Boost 컨버터의 금속분말 인덕터에 관한 연구
김윤성(Yun-Sung Kim),안태영(Tae-Young Ahn),장평우(Pyung-Woo Jang),정인범(In-Bum Jeong),최광보(Gwang-Bo Choi) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In this paper, the experiment and simulation results of the Boost converter for PFC(power factor correction) using metal powder inductor are presented. The metal powder inductor used in the experiment was composed of Ni-Fe-Mo, Ni-Fe, Fe-Si-Al compound respectively. The performance of the 500W class PFC rectifier with the average current mode control and the 300W class PFC rectifier with the variable frequency control, are evaluated.