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.

Glyphosate 근주 후 발생한 봉와직염 1례

김윤성,옥택근,신명철,최현영,문중범,김성은,서정열,안무업,조병렬,김용훈,이봉기,김명,조준휘,Kim, Yoon-Sung,Ohk, Taek-Gun,Shin, Myeung-Cheol,Choi, Hyun-Young,Moon, Joong-Bum,Kim, Sung-Eun,Seo, Jeong-Yeul,Ahn, Moo-Eob,Cho, Byung-Ryul,Kim, Yang 대한임상독성학회 2007 대한임상독성학회지 Vol.5 No.1

Glyphosate is the active ingredient in widely used herbicides. It acts through inhibition of the shikimate metabolic pathway in plants. This pathway does not exist in mammals, however, so glyphosate is presumably less toxic to humans. Nevertheless, fatal cases of glyphosate poisoning in humans have still occurred. Cases of glyphosate poisoning reported in the previous literature were almost always caused by intentional ingestion. Therefore, intramuscular injection of glyphosate with suicidal intent has not been reported. We report a case of 43-year-old man with poisoning due to intramuscular injection of glyphosate herbicide. He was admitted to the emergency department with a chilling sensation, local hotness, swelling, and tenderness at the site of glyphosate injection. He was treated with intravenous antibiotics and analgesics for 10 days and was discharged without any other complication.

수박계통간 염색체수준의 유전적변이 분석

김윤성,고찬섭,양희범,강순철,Kim, Youn-Sung,Ko, Chan-Sup,Yang, Hee-Beom,Kang, Sun-Chul 한국식물생명공학회 2016 식물생명공학회지 Vol.43 No.2

수박의 형태적 변이의 유전적 원인을 분석해 보기 위해 8개 계통에서 re-sequencing을 수행하였다. 유전적 변이의 수는 염색체에 따라 다르게 나왔으며 발견된 SNP의 약 12.9%만이 유전자내에서 발견되었고 나머지는 프로모터나 유전자 사이의 지역에서 발견되었다. SNP 밀도에 대한 분석 결과 염색체 6번의 말단지역에 변이가 집중되어 있는 것을 알 수 있었다. 또한 염색체 10과 11번에 잘 보존된 지역을 발견하였다. Pathway 분석을 통해 DIMBOA(일종의 항생제)-glucoside 분해 대사가 계통간 가장 차이나는 것으로 확인되었으며 이는 각 계통의 병저항성에서 차이가날 가능성을 시사하는 것이다. 당대사 관련 유전자 변이를 분석한 결과 alpha-galactosidase 유전자에 가장 변이가 많은 것으로 밝혀졌다. 이러한 연구 결과는 육종을 분자수준에서 이해하는 데 도움을 줄 것으로 생각한다. To investigate the genetic basis of phenotypic differences, sequence variations were analyzed in 8 inbred watermelon lines by re-sequencing. The number of sequence variations differed depending on the chromosome. Only 12.9% of SNPs were found within genes, whereas the rest were detected in promoter or intergenic regions. SNP density analysis showed that there was a highly variable region at the end of chromosome 6, which is similar to previously published findings. However, this region with high SNP density did not show much variation between the lines. In contrast, highly conserved regions with a size of 6.5-10 Mb were found in chromosomes 10 and 11. Pathway analysis suggested that the DIMBOA (a natural antibiotic)-glucoside degradation pathway was significantly different between the lines, indicating that the eight lines may have different levels of pathogen resistance. Among the carbohydrate-related genes, the alpha-galactosidase gene was the most variable among the lines. Information from this study will be helpful in understanding the watermelon breeding process at the molecular level.

어느 음향 설계자의 고민

김윤성,Kim, Yun-Seong 대한건축사협회 2005 建築士 Vol.2005 No.12

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.

PVD 공정을 이용한 Si 양자점 형성 전산모사

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.

Cauda Equina Syndrome Caused by Idiopathic Epidural Lipomatosis

김윤성,주창일,김석원,Hyeun Sung Kim 대한척추신경외과학회 2015 Neurospine Vol.12 No.4

Spinal epidural lipomatosis (SEL) is a rare condition that presents as a back pain with progressive neurologic symptoms. Most affected patients are obese and receiving steroid therapy, or have an endocrinopathies. We report a rare case of cauda equina syndrome caused by SEL in a non-obese healthy young man without any evident traumatic episode. A healthy 19-year-old man, who had experienced lower back pain for two months, visited our emergency room because of the sudden development of motor weakness and voiding difficulty. Lumbar magnetic resonance image revealed extradural fat compressing the cauda equina. Urgent decompression via posterior laminectomy and excision of excess epidural fat resulted in an immediate symptom improvement.

한국인 성인형 치주염의 임상 및 미생물학적 연구

김윤성,신형식,Kim, Yan-Sung,Shin, Hyung-Shik 대한치주과학회 1991 Journal of Periodontal & Implant Science Vol.21 No.2

Superoxide Dismutase가 백서의 실험적 치은염과 3T3 섬유모 세포의 활성에 미치는 영향

김윤성,유형근,강현구,신형식,Kim, Yoon-Seong,Yoo, Hyung-Keun,Kang, Hyun-Ku,Shin, Hyung-Shik 대한치주과학회 1995 Journal of Periodontal & Implant Science Vol.25 No.2

Inflammatory cells may produce active species of oxygen in antimicrobial defense. While such species can directly damage surrounding tissue, their major secondary role may be to mediate important components of the inflammatory response. Superoxide dismutase, antioxidant, have significant anti-inflammatory properties in rheumatoid arthritis, ischemic tissue injury and gastrointestinal disease. Increased oxidative product formation diseases. And superoxide dismutase produced by Porphyromonas Gingivalis is resistant to killing by polymorphonuclear leukocyte. The purpose of this study was to investigate on the effects of superoxide dismutase in 3T3 fibroblast and in experimental gingivitis in the rats. The effect of superoxide dismutase(SOD) to cell morphology and cell activity was measured in cultured mouse 3T3 fibroblast. After experimental gingivitis were induced by lipopolysaccharide(LPb) and bovine serum albumin(BSA), injection of SOD were done. WBC count and histologic findings were observed at 1, 2, 3, and 7 days. The results were as follows; 1. There was a little difference between LPS treated groups and SOD treated groups in 3T3 fibroblast morpholoy. 2. There was no difference between only SOD treated groups (except SOD 150U at 3days) and control in 3T3 fibroblast activity. 3. LPS $0.5{\mu}g/ml$ and SOD treated groups (except 150U) had decreased 3T3 fibroblast activity and no significant difference at 3 days. 4. LPS $5.0{\mu}g/ml$ and SOD treated groups were significantly increased cell activity of 3T3 fibroblast than control group at 1 day(P<0.05). 5. In LPS induced gingivitis, the number of leukocytes in SOD treated was significantly decreased than in saline treated at 1 day(P<0.05). 6. In histopathologic findings of LPS or BSA induced gingivitis, inflammatorycell infiltration in SOD treated groups were less than in saline treated group at 1, 2 and 3 days.

이중돌극기의 종류에 따른 특성 비교

김윤성(Youn-Sung Kim),진창성(Chang-Sung Jin),김승주(Seung-Joo Kim),이호준(Ho-Joon Lee),김경범(Koung-Bum Kim),이주(Ju Lee),정인성(In-Sung Jung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

Generally, the Doubly Salient Machine such as Switched Reluctance Motor doesn't have Permanent Magnet, it sometimes adopts permanent magnet or DC filed winding for high efficiency or adjustable speed control. In this paper, adjustable speed range is compared for Doubly Salient Permanent Magnet Machine (DSPM), Brushless Doubly Fed Doubly Salient Machine (BDFDS) and Hybrid Excited Doubly Salient Machine (HEDS). Especially, air-gap flux density to the DC field current is shown and the operating speed as the field-weakening is estimated.