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구강악안면영역의 치성감염으로 인한 근막간극 감염에 대한 회귀적 연구
김성혁,이재훈,Kim, Sung-Hyuck,Lee, Jae-Hoon 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.1
Infections in oral and maxillofacial region are relativley common and self-limiting, but in some cases, infections spread to adjacent hard and soft tissue and to cause any complication, even threaten life. So we made retrospective study of patients with interfascial infection who had been hospitalized and been treated by surgical treatment in Dankook university about 10 years. We reviewed the charts of patient with interfascial infection from 1995 to 2005. The result were as follows: 1. In gender & age distribution, male(54.2%) & fouth decade were most frequently. 2. The most common cause of infection was dental caries(55.2%) and the most of involving teeth was lower posterior teeth(44.1%). 3. Submandibular space is most frequently involving space and most infection involved mainly one space. 4. The patients with systemic disease were 38.2%. Diabetic mellitus was 87.2% of systemic diease. The admission period was 19.5 days in systemic disease. 5. The most microorganism in culture was Streptococcus Viridans(36.2%) in all patient. Klebsiella Pneumoniae was found most in Diabetic Mellitus. 6. The patient were mainly treated I&D on admission day. Of them 5(1.1%) patients were received tracheostomy. 7. Serum albumin, CRP and body weight are associated with Nutritional Risk Index(NRI). High risk patient group according to NRI classification showed higher rate of complications & mortality. 8. The patients with complication were 28(6.7%) persons. 4(0.9%) patients were expired. Nutritional Risk Index was helpful to predict the prognosis. When interfascial infection starts to spread, we must pay attention to airway management. Fluid therapy with nutritional may support to healing of wound.
김성혁,하진희,Kim, Sung-hyuk,Ha, Jin-hyee 한국기록학회 2002 기록학연구 Vol.0 No.5
Metadata is a structured data that makes computer to understand web based data. Types of metadata are Dublin core, ONIX, and EBKS metadata in Korea. Dublin Core is well known among these metadata. Archive is a data, that is the result of ones or groups working process, which is reasonably maintained and stored. These archives are stored and maintained lawfully and suitably for efficient usages for the future. For efficiently managing these grant amount of archive, Finding Aids and Description are needed. Adoption Archives and Records Management system is inevitable in order to maintain organized and efficient data. Metadata helps governments data that is grant to organize in simple way. For maintaining and storing data efficiently, using metadata for Archives and Records Management is essential. Form this report, we will see the examples of using metadata of other country, such as GILS(Government Information Locator Service), AGLS(The Australian Government Locator Service), NZGLS(New Zealand Government Locator Service), Danish Dublin Core and e-GMS(e-Government Metadata Standard) and e-GMF(e-Government Metadata Framework).
국가과학기술산업 디지털문헌정보센터 모델 정립에 관한 연구
김성혁,이혜진,Kim, Sung-Hyuk,Lee, Hye-Jin 한국과학기술정보연구원 과학기술정보센터 2002 Journal of Information Science Theory and Practice Vol.33 No.1
이 연구는 한국과학기술정보연구원(KISTI)이 국내외 과학, 기술 및 산업정보의 대표기관으로 정착하고 새로운 정보환경에 적응할 수 있도록 디지털문헌정보센터의 모델과 그 효과에 대해 기술한 것이다. 이에 따라 선진 디지털문헌정보센터를 참고하여 우리 나라 실정에 맞는 문헌정보센터 기능과 역할을 재조명하고 모델에 대한 제안과 계획을 수립하였다. This study is to propose the model of Digital Document Information Center at KISTI which is a representative center of science, technology and industry information in Korea. The model proposed at this study is reflected current information environment such as digitalization, Internet and various internal and external situations. Also, the study is proposed the medium and long range plans for the center.
PCB 표면처리에 따른 Sn-1.2Ag-0.7Cu-0.4In 무연솔더 접합부의 기계적 신뢰성에 관한 연구
김성혁,김재명,유세훈,박영배,Kim, Sung-Hyuk,Kim, Jae-Myeong,Yoo, Sehoon,Park, Young-Bae 한국마이크로전자및패키징학회 2012 마이크로전자 및 패키징학회지 Vol.19 No.4
표면처리에 따른 Sn-1.2Ag-0.7Cu-0.4In 솔더범프의 접합 강도 평가를 위하여 전단 속도 및 열처리 시간에 따른 볼 전단강도 시험을 실시하였다. 전반적으로, 전단속도가 증가함에 따라 전단강도는 증가하였지만 인성은 감소하는 경향을 나타내었다. 파괴모드 관찰 결과, 전단 속도가 증가함에 따라 파괴모드의 경우, ENIG(electroless nickel immersion gold) 처리는 취성파괴가 대부분 지배적으로 존재하였고, OSP(organic solderability preservative) 처리는 pad open이 주로 발생하였다. 또한, 500 mm/s의 고속전단시험에서는 열처리 시간이 증가함에 따라 표면처리별 전단강도와 인성 값 모두 감소하는 경향을 보였다. ENIG 표면처리가 OSP 표면처리 보다 좋은 접합강도 특성을 보이는 것은 솔더범프 계면의 금속간화합물의 물성 및 두께와 밀접한 연관이 있는 것으로 판단된다. Ball shear test was performed by test variables such as loading speed and annealing time in order to investigate the effect of surface finishes on the bonding strength of Sn-1.2Ag-0.7Cu-0.4In Pb-free solder. The shear strength increased and the ductility decreased with increasing shear speed. With increasing shear speed, the electroless nickel immersion gold (ENIG) finish showed dominant brittle fracture mode, while organic solderability preservative (OSP) finish showed pad open fracture mode. The shear strength and toughness for both surface finishes decreased with increasing annealing time under the high-speed shear test of 500 mm/s. Typically, the thickness of intermetallic compound increased with increasing annealing time, which means that exposure of brittle fracture became much easier. With increasing annealing time, the both ENIG and OSP finishes exhibited the pad open fracture mode. Overall, ENIG finish showed higher shear strength rather than OSP finish due to its superior barrier stability.
PCB의 ENIG와 OSP 표면처리에 따른 Sn-3.5Ag 무연솔더 접합부의 Electromigration 특성 및 전단강도 평가
김성혁,이병록,김재명,유세훈,박영배,Kim, Sung-Hyuk,Lee, Byeong-Rok,Kim, Jae-Myeong,Yoo, Sehoon,Park, Young-Bae 한국재료학회 2014 한국재료학회지 Vol.24 No.3
The effects of printed circuit board electroless nickel immersion gold (ENIG) and organic solderability preservative (OSP) surface finishes on the electromigration reliability and shear strength of Sn-3.5Ag Pb-free solder bump were systematically investigated. In-situ annealing tests were performed in a scanning electron microscope chamber at 130, 150, and $170^{\circ}C$ in order to investigate the growth kinetics of intermetallic compound (IMC). Electromigration lifetime and failure modes were investigated at $150^{\circ}C$ and $1.5{\times}10^5A/cm^2$, while ball shear tests and failure mode analysis were conducted under the high-speed conditions from 10 mm/s to 3000 mm/s. The activation energy of ENIG and OSP surface finishes during annealing were evaluated as 0.84 eV and 0.94 eV, respectively. The solder bumps with ENIG surface finish showed longer electromigration lifetime than OSP surface finish. Shear strengths between ENIG and OSP were similar, and the shear energies decreased with increasing shear speed. Failure analysis showed that electrical and mechanical reliabilities were very closely related to the interfacial IMC stabilities.
김성혁,Kim, Sung-Hyuk 한국과학기술정보연구원 과학기술정보센터 1990 Journal of Information Science Theory and Practice Vol.21 No.1
본(本) 연구(硏究)에서는 베이지안 이론(理論)을 이용(利用)한 확률적(確率的) 추론방법(方法)을 도입하여 불확실한 정보(情報)에 그 불확실성(不確實性)을 고려해주고, 그러한 과정(過程)을 통하여 가설들에 대한 확실성(確實性)의 정도(程度)를 평가(評價)해주는 전문가(專門家) 대체 시스템을 위한 일종의 지식습득 과정(過程)을 전개하였다. The probabilistic reasoning method using Bayesian theory is studied to use uncertain or incomplete knowledge in ways that take the uncertainty into account. This method presented for knowledge acquisition process of expert system to evaluate certainty degree of input knowledge.
해외 선진 과학기술기관의 정보 유통체제 동향 분석 및 시사점
김성혁,Kim, Seong-Hyeok 한국과학기술정보연구원 2004 지식정보인프라 Vol.13 No.-
국가 차원에서 과학기술정보활동을 담당하고 있는 일본과학기술진흥기구와 프랑스과학기술정보연구원은 정부로부터 예산지원을 받는 공공기관이다. 본 글에서는 일본과학기술진흥기구와 프랑스과학기술정보연구원의 과학기술정보활동, 조직 및 사업내용에 대해 개략적으로 살펴보고자 한다. 그리고 이를 각 기관의 정보유통체계를 정보자원의 수집, 콘텐트 개발, 정보서비스 측면에서 살펴보고 한국 과학기술정보활동의 핵심적 역할을 담당하고 있는 KISTI에 시사점을 제시하고자 한다.