붓가는대로:멀리 보는 눈,남해대교와 이탈사,험난한 인생행로,회상의 사슬,히리미기산 사람들,책과 외판원

김준성,유두영 외4명 북한연구소 1985 北韓 Vol.- No.163

$Mg_2$Ni계 수소저장합금전극의 퇴화거동에 미치는 불화 처리 영향

김준성,최재웅,이창래,강성군,Kim, Jun-Seong,Choe, Jae-Ung,Lee, Chang-Rae,Gang, Seong-Gun 한국재료학회 2001 한국재료학회지 Vol.11 No.4

Effects of the surface fluorination on the electrochemical charge-discharge properties of $Mg_2$Ni electrode in Ni-MH batteries fabricated by mechanical alloying were investigated. After 20h ball milling, Mg and Ni powder formed nanocrystalline $Mg_2$Ni. Discharge capacity of this alloy increased greatly at first one cycle, but due to the formation of Mg(OH)$_2$ passive layer, it showed a rapid degradation in alkaline solution within 10cyc1es. In case of 6N KOH +xN KF electrolyte (x = 0.5, 1, 2), a continuous and stable fluorinated layer formed by adding excess F$^{[-10]}$ ion, increased durability of $Mg_2$Ni electrode greatly and high rate discharge capability(90-100mAh/g). 2N KF addition led to the highest durability of all tested here. The reason of the improvement is due to thin MgF$_2$, which can prevent the $Mg_2$Ni electrode from forming Mg(OH)$_2$layer that is the main cause of degradation.

접촉각 측정과 AFM/LFM을 이용한 불화 유기박막의 특성 평가

김준성,차남구,이강국,박진구,신형재 한국마이크로전자및패키징학회 2000 마이크로전자 및 패키징학회지 Vol.7 No.1

Teflon-like fluorocarbon thin film was deposited on various substrates by vapor deposition using PFDA (perfluorodecanoic acid). The fluorocarbon films were characterized by static/dynamic contact angle analysis, VASE (Variable-angle Spectroscopic Ellipsometry) and AFM/LFM (Atomic/Lateral Force Microscopy). Based on Lewis Acid/Base theory, the surface energy ($S_{E}$) of the films was calculated by the static contact angle measurement. The work of adhesion (WA) between de-ionized water and substrates was calculated by using the static contact data. The fluorocarbon films showed very similar values of the surface energy and work of adhesion to Teflon. All films showed larger hysteresis than that of Teflon. The roughness and relative friction force of films were measured by AFM and LFM. Even though the small reduction of surface roughness was found on film on $SiO_2$surface, the large reduction of relative friction farce was observed on all films. Especially the relative friction force on TEOS was decreased a quarter after film deposition. LFM images showed the formation of "strand-like"spheres on films that might be the reason far the large contact angle hysteresis.

Polyethylene Terephthalate (PET) FOAM의 전과정 환경성 평가(LCA)적 고찰

김준성,Kim, Jeun-Seong 한국복합신소재구조학회 2013 복합신소재학회논문집 Vol.4 No.1

가변 대역분할 웨이블릿필터를 이용한 오디오 부호화기

김준성,강현철,변윤식 한국음향학회 1998 韓國音響學會誌 Vol.17 No.5

본 논문에서는 입력신호의 시변특성에 따라 분석 필터의 대역을 가변 시키는 필터 뱅크의 구조를 제안한다. 제안된 필터뱅크는 일반적으로 32개의 균일한 대역으로 나누어 임 계대역의 표현을 적절히 표현하지 못하는 Polyphase 필터의 단점을 극복하면서 시스템 설 계에 높은 계산량을 요구하는 QMF-tree 필터의 단점을 보완한다. 본 연구에서는 분할 대역 은 4개에서 26개의 대역으로 가변하고, 웨이블릿 필터중 Daubechies필터를 사용하였다. 제 안된 구조의 부호화기는 128kbps에서 MPEG-a오디오와 비슷한 수준의 CD 음질을 유지하 며, 연산량 비교결과는 PolyPhase filter를 이용한 MPEG보다 부호화, 복호화 과정을 합쳐 다양한 전송률과 음원에서 평균 19%의 감소를 얻었다.

부분최소자승 회귀분석을 이용한 변수 간 인과관계탐색 알고리즘

김준성,이수동,전치혁 대한산업공학회 2012 대한산업공학회 추계학술대회논문집 Vol.2012 No.11

In recent years, there have been many attempts to develop and improve causal discovery algorithms (CDA) for learning structures of Bayesian networks. Constraint-based CDAs implement conditional independence (CI) tests to verify dependency between variables so as to find a directed acyclic graph which is observationally equivalent to the noninterventional data. Multiple Search (MS) algorithm exploits multiple linear regression for CI test in which multiple search is possible in a CI test so as to improve both speed and accuracy. However, the CI test based on multiple linear regression might be unreliable if there exists multicollinearity among variables. To deal with the multicollinearity problem, we propose a robust CI test using partial least squares (PLS). Using PLS regression, the proposed method performs better when applied to data with multicollinearity. We show the robustness of our method by a numerical example.

Calcium sulfate와 혈소판 유래성장인자의 혼합사용이 치주인대세포에 미치는 영향

김준성,최성호,유윤정,채중규,김종관,조규성,Kim, Jun-Seong,Choi, Seong-Ho,Yu, Yun-Jung,Chai, Jung-Kiu,Kim, Chong-Kwan,Cho, Kyoo-Sung 대한치주과학회 1997 Journal of Periodontal & Implant Science Vol.27 No.4

It was well known that calcium sulfate was biocompatible, resorbed rapidly in the body, had potential as a good barrier membrane. Platelet-derived growth factor(PDGF) was one of polypeptide growth factor that had been reported as a biological mediator which regulates activities of wound healing process including the cell proliferation, migration and metabolism. The purpose of this study was to evaluate the effects of a combination of calcium sulfate and PDGF on periodontal ligament cells in vitro to use as a regeneration promoting agent of periodontal tissue. Human periodontal ligament cells were prepared from the premolar tooth extracted for the orthodontic treatment. Cells were cultured in ${\alpha}-MEM$ contained with 20% FBS, at the $37^{\circ}C$, 100% of humidity, 5% $Co_2$ incubator. Cells were inoculated and cultured into 96 well culture plate with $1{\times}10^4cells/well$ of ${\alpha}-MEM$ for 1 day. After discarding the medium, those cells were cultured in ${\alpha}-MEM$ contained with 10% FBS alone(control group), in calcium sulfate(calcium sulfate group), in calcium sulfate treated with 15ng/ml of PDGF-BB(calcium sulfate+PDGF group), in ${\alpha}-MEM$ contained with 10% FBS treated with 15ng/ml of PDGF-BB(PDGF group) for 1, 2, 3 day respectively. And then each group was characterized by examining of the cell counting, MTT assay, collagen synthesis. The results were as follows. 1. In the analysis of cell proliferation by cell counting, both calcium sulfate group and calcium sulfate plus PDGF group showed no stastically significant difference compared to control group, but there was stastically significant difference between PDGF group and calcium sulfate group at 1, 2 day(P<0.05). 2. In the analysis of cell proliferation by MTT assay in calcium sulfate extracts, both calcium sulfate group and calcium sulfate plus PDGF group showed no stastically significant difference compared to control group, but there was stastically significant difference between PDGF group and calcium sulfate group at 2, 3 day, and between calcium sulfate plus PDGF group and calcium sulfate group at 2 day(P<O.05). 3. In the analysis of cell proliferation by MTT assay in transwell, both control group and PDGF group showed stastically significant difference compared to both calcium sulfate group and calcium sulfate plus PDGF group at 1 day, but there was no stastically significant difference compared to both calcium sulfate group and calcium sulfate plus PDGF group at 2, 3 day(P(0.05). 4. In the analysis of collagen synthesis by immunoblotting assay in calcium sulfate extracts, high level was detected on calcium sulfate group at 3 day, on calcium sulfate plus PDGF group at 1 day, on PDGF group at 2 day. On the basis of these results, calcium sulfate was biocompatible on the periodontal ligament cells and might have potential possibility as a vehicle of PDGF in the periodontal tissue regeneration.

Non-bismuth 사제요법 후에 가장 효과적인 헬리코박터 2차 제균 치료법은 무엇인가?

김준성 대한상부위장관ㆍ헬리코박터학회 2015 Korean Journal of Helicobacter Upper Gastrointesti Vol.15 No.2

궤양성 대장염에 동반된 간정맥 혈전증 1예

김준성,김경모,Kim, Joon-Sung,Kim, Kyung-Mo 대한소아소화기영양학회 2009 Pediatric gastroenterology, hepatology & nutrition Vol.12 No.2

Patients with inflammatory bowel disease are known to have hypercoagulability and an increased risk for venous thromboembolism. The deep veins of the lower extremities and the pulmonary veins are the most common sites of thrombosis in ulcerative colitis. However, hepatic vein thrombosis (Budd-Chiari syndrome) is a very rare extra-intestinal complication of ulcerative colitis in children. We describe a case of hepatic vein thrombosis in a 15-year-old girl with ulcerative colitis who presented with abdominal pain and hematochezia. Doppler ultrasonography and an abdominal CT scan revealed the characteristic filling defects caused by large thrombi in both hepatic veins. These lesions were successfully treated with conventional management for ulcerative colitis and anticoagulation therapy.

관상동맥우회술 후 재수술의 단기 및 중기 성적

김준성,김홍관,장우익,김기봉 대한흉부외과학회 2004 Journal of Chest Surgery Vol.37 No.2

배경: 다방성 흉막수 또는 농흉 환자의 성공적인 치료를 위해서는 효과적인 배액술과 원인적 질환의 확진이 필요하다. 본 연구의 목적은 폐쇄성 흉강 삽관술 등의 치료에도 배액되지 않은 농흉이나 다방성 흉막수 환자에서 비디오 흉강경을 이용한 배액술 및 데브리망, 세척술의 효과와 실효성의 평가를 목적으로 한다. 대상 및 방법: 2000년 4월부터 2002년 7월까지 본원 흉부외과에 흉막수 및 농흉으로 입원한 환자 중 폐쇄성 흉강 삽관술 등으로 적절히 배액되지 않았던 환자 중 발병한지 2주일이 안된 20명을 대상으로 수술 전 흉부 전산화 단층 촬영을 실시하여 환자의 상태를 평가한 후 전신 마취하에서 비디오 흉강경을 이용한 배액술 및 데브리망, 조직검사, 세척술을 실시하였다. 결과: 20예의 환자 중 18예에서 성공적인 비디오 흉강경 배액 및 세척술이 실시되었고 2예에서 개흉술을 시행하였다. 남녀 비는 4:1이었으며 평균 연령은 48.9세(17∼72세), 수술 후 평균 흉관 거치 기간은 8.2일 (4∼22일), 수술 후 평균 재원 기간은 15.2일(7∼33일)이었다. 원인 질환으로 결핵, 폐렴에 의한 합병증, 외상에 의한 혈흉, 전이성 유방암 등이었다. 수술 후 중대한 합병증은 없었으며 환자들은 증상이 호전되어 외래 통원 치료 및 추적 관찰 중이다. 결론: 기질화 되지 않은 초기의 농흉이나 다방성 흉막수 환자에서 비디오 흉강경을 이용한 배액술, 데브리망은 비교적 안전하고 유용한 시술이라 하겠다.