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김형우,김정희,김영수,Kim, Hyung-Woo,Kim, Chang-Whe,Kim, Yung-Soo 대한치과보철학회 1995 대한치과보철학회지 Vol.33 No.3
A success of complete denture prosthesis can be determined by the satisfaction degree of the dentist and the patient. There are many factors influencing on the satisfaction of the complete denture patients. The purpose of this study is to analyze the correlation between the masticatory satisfaction and clinical evaluation, and the speech satisfaction and clinical evaluation in complete denture patients. 79 patients(total 119 complete dentures) were examined in this study who were treated in Seoul National University Dental Hospital. Through clinical evaluation, 2 examiners evaluated sex, age, edentulous period, the years of having used present complete denture, the number of the previous dentures, the state of the opposite arch, retention, stability, support, occlusion, vertical dimension of the complete denture and the condition of the residual alveolar ridge. Through questionnaires concerned with mastication and speech, examiners evaluate the satisfaction degree of the patients. This study led to the conclusion that : 1. The satisfaction degree of the mastication was lower in older patients(p<0.001) and in patients whose present complete denture period was shorter(p<0.05). The satisfaction degree of the mastication in male was higher than in female patients(p<0.01). 2. The satisfaction degree of the mastication was high when the retention of the complete denture was good(p<0.05), and when the condition of the residual alveolar ridge was good(p<0.05). 3. The satisfacion degree of the speech was high when the retention of the complete denture was good(p<0.01). 4. The satisfaction degree of the mastication was higher in patients with upper and lower complete denture than in patients with single complete denture whose oppsite arch was unilateral partial denture(p<0.05).
표면 도핑 기법을 사용한 SOI RESURF LDMOSFET의 항복전압 및 온-저항 특성 분석
김형우,김상철,방욱,강인호,김기현,김남균,Kim Hyoung-Woo,Kim Sang-Cheol,Bahng Wook,Kang In-Ho,Kim Kl-Hyun,Kim Nam-Kyun 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.1
In this paper, breakdown voltage and on-resistance characteristics of the surface doped SOI RESURF LDMOSFET were investigated as a function of surface doping depth. In order to verify the variation of characteristics, two-dimensional device simulation was carried out. Breakdown voltage of the proposed structure is varied from $73 {\~}138V$ while surface doping depth varied from $0.5{\~}2.0{\mu}m$. And on-resistance is decreased from $0.18{\~}0.143{\Omega}/cm^2$ while surface doping depth increased from $0.5 {\~}2.0{\mu}m$. Maximum breakdown voltage of the proposed structure is 138 V at $1.5{\mu}m$ depth of surface doping, yielding $22.1\%$ of improvement of breakdown voltage in comparison with that of the conventional SOI RESURF LDMOSFET with same epi-layer concentration. On-resistance characteristic is also improved about $21.7\%$.
에피층 농도 변화에 따른 Multi-RESURF SOI LDMOSFET의 전기적 특성 분석
김형우,서길수,방욱,김기현,김남균,Kim, Hyoung-Woo,Seo, Kil-Soo,Bahng, Wook,Kim, Ki-Hyun,Kim, Nam-Kyun 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.9
In this paper, we analyzed the breakdown voltage and on-resistance of the multi-RESURF SOI LDMOSFET as a function of epi-layer concentration. P-/n-epi layer thickness and doping concentration of the proposed structure are varied from $2{\sim}5{\mu}m\;and\;1\{times}10^{15}/cm^{3}^{\sim}9\{times}10^{15}/cm^{3}$ to find optimum breakdown voltage and on-resistance of the proposed structure. The maximum breakdown voltage of the proposed structure is $224\;V\;at\;R_{on}=0.2{\Omega}-mon^{2}\;with\;P_{epi}=3\{times}10^{15}/cm^{3},\;N_{epi}=7\{times}10^{15}/cm^{3}\;and\;L_{epi}=10{\mu}m$. Characteristics of the device are verified by two-dimensional process simulator ATHENA and device simulator ATLAS.
박막증착시 티타늄 표면의 마손저항도와 세포독성에 관한 연구
김형우,김창회,김영수,Kim Hyung-Woo,Kim Chang-Whe,Kim Yung-Soo 대한치과보철학회 2001 대한치과보철학회지 Vol.39 No.1
Titanium is widely used in dentistry for its low density, high strength, fatigue resistance, corrosion resistance, and biocompatibility. But it has a tendency of surface damage under circumstance of friction and impact for its low hardness of the surface. Coating is one of methods fir increasing surface hardness. Its effect is to improve surface physical characteristics without change of titanium. Diamond-like carbon and titanium nitride are known for its high hardness of the surface. So that this study was aimed at the wear test and the cytotoxicity test of the commercially pure titanium and Ti-6Al-4V alloy which were deposited by diamond-like carbon film or titanium nitride film to acertain improvement of the surface hardness and the biocompatibility. A disk (25mm diameter, 2mm thickness) was made of commercially pure titanium and Ti-6Al-4V alloy and these substrates were deposited by diamond-like carbon film or titanium nitride film. Diamond-like carbon film was deposited by the method of radiofrequency plasma assisted chemical vapor deposition and titanium nitride film was deposited by the method of reactive arc ion plating. Then these substrates were tested about wear characteristics by the pin-on-disk type wear tester in which ruby ball was used as a wear causer under the load of 32N, The fracture cycles were measured by rotating the substrates until their films were fractured. The wear volume was measured after 150 cycles and 3,000 cycles using surface profiler. The cytotoxicity test was peformed by the method of the MTT assay. The results were as follows : 1. In the results of the wear volume test, commercially pure titanium and titanium alloy which were coated by diamond-like carbon film or titanium nitride aim had higher resistance against wear than the substrates which were not coated by any films (P<0.05). 2. In the results of the fracture cycle test and the wear volume test, diamond-like carbon film had higher resistance against wear than titanium nitride film (P<0.05). 3. In both coatings of diamond-like carbon aim and titanium nitride film, Ti-6Al-4V alloy had higher resistance against wear than commercially pure titanium (P<0.05) 4. In the results of the cytotoxicity test, diamond-like carbon film and titanium nitride film had little cytotoxicity as like commercially pure titanium or Ti-6Al-4V alloy (P>0.05).
희귀 사건 로지스틱 회귀분석을 위한 편의 수정 방법 비교 연구
김형우,고태석,박노욱,이우주,Kim, Hyungwoo,Ko, Taeseok,Park, No-Wook,Lee, Woojoo 한국통계학회 2014 응용통계연구 Vol.27 No.2
본 연구에서는 로지스틱 회귀 모형을 이용하여 보은 지방의 산사태 자료를 분석하였다. 5000 지역의 관측치 가운데 단 9개만이 산사태 발생 지역이므로 이 자료는 희귀 사건 자료로 간주될 수 있다. 로지스틱 회귀 분석 모형이 희귀사건 자료에 적용될 때 주요 이슈는 회귀 계수 추정치에 심각한 편의 문제가 생길 수 있다는 것이다. 기존에 두 가지의 편의 수정 방법이 제안되었는데, 본 논문에서는 시뮬레이션을 통해 정량적으로 비교 연구를 진행하였다. Firth(1993)의 방식이 다른 방법에 비해 우수한 성능을 보였으며, 이항 희귀 사건을 분석하는 데 있어서 매우 안정된 결과를 보여주었다. We analyzed binary landslide data from the Boeun area with logistic regression. Since the number of landslide occurrences is only 9 out of 5000 observations, this can be regarded as a rare event data. The main issue of logistic regression with the rare event data is a serious bias problem in regression coefficient estimates. Two bias correction methods were proposed before and we quantitatively compared them via simulation. Firth (1993)'s approach outperformed and provided the most stable results for analyzing the rare-event binary data.
신재생에너지 도입에 따른 시설재배의 경제성 분석 -목재팰릿, 지열과 경유의 비교분석을 중심으로-
김형우,윤성이,Kim, Hyung Woo,Yoon, Sung-Yee 한국유기농업학회 2014 韓國有機農業學會誌 Vol.22 No.2
We are now currently facing serious climate changes such as super typhoon, flood, intense heat, severe cold, super hurricane, drought, desertification, destruction of ecosystem, marine pollution, reduction of food production, destruction of tropical forests, exhaustion of water resources, climate refugees, etc. All of the above mainly derive from greenhouse gas exhaustion. Such harmful consequence might directly affect mankind's sustainable development. If we keep using resources that emits greenhouse gases, the global temperature will rise about $3.2^{\circ}C$ by year 2050. In case of $3^{\circ}C$ rise in temperature, it will result in abnormal climate which will bring about severe property damage. Moreover, 20~50% of the ecosystem will become extinct. As Korea's economy increasingly expands, so do our energy consumption rises. And because of the consequences that can be driven by increasing rate of resource use, not just Korea itself, but also the whole world should seriously concern about greenhouse gases. Although agricultural division only takes up about 3.2% of total greenhouse gas emission, the ministry of Agriculture, Food and Rural Affairs are taking voluntary actions to gradually reduce $CO_2$ and so does each and every related organizations. In order to reduce $CO_2$, introduction of new and renewable energy in farm house warming is crucial. In other words, implementing wood-pellet boiler and geothermal heat boiler can largly reduce $CO_2$ emission compared to diesel boiler. More importantly, not only wood-pellet and geothermal heat is pollution-free but they also have economic advantages some-what. In this thesis, the economic advantage and sustainablity will be introduced and proved through comparing practical analysis of surveyed farm house under structure employing wood-pellet boiler and geothermal heat boiler with Agriculture-Economic Statistic of 2012 who uses diesel boiler.
김형우,허중연,이용문,SJ Kim,정혜원 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.4
Pneumocystis jirovecii pneumonia (PJP) in patients with HIV infection can, in rare cases, present with pulmonary nodules that histologicallyinvolve granulomatous inflammation. This report describes an intriguing case of granulomatous PJP with pulmonarynodules after commencing antiretroviral therapy (ART) in an HIV-infected patient without respiratory signs or symptoms. Diagnosisof granulomatous PJP was only achieved through thoracoscopic lung biopsy. This case suggests that granulomatous PJP shouldbe considered in the differential diagnosis of pulmonary nodules in HIV-infected patients for unmasking immune reconstitutioninflammatory syndrome manifestation after initiation of ART.
하악지에서의 하치조신경관 주행에 대한 Conebeam CT를 이용한 연구
김형우,권경환,민승기,오승환,지영덕,고세욱,이재환,온병훈,Kim, Hyong-Woo,Kwon, Kyung-Hwan,Min, Seung-Ki,Oh, Seung-Hwan,Chee, Young-Deok,Koh, Se-Wook,Lee, Jae-Hwan,Ohn, Byung-Hun 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.5
Objectives: This study was performed to evaluate course of the inferior alveolar canal in the mandibular ramus and to find safety zone when ramal bone is harvested. Patients and Methods: From January, 2009 to February, 2009, the 20 patients who visited in the Department of Oral and Maxillofacial Surgery, Sanbon Dental Hospital. Wonkwang University and the Conebeam CT was taken of various chief complaints, were selected. The patients who had left and right mandibular first molar and incisor missing, jaw fracture and bone pathology were excluded. The R point was defined as the point which occlusal plane was crossed to the mandibular anterior ramus(external oblique ridge). In the cross-sectional coronal and axial views, the inferior alveolar canal position to the R point, buccal bone width(BW), alveolar crest distance(ACD), distance from alveolar crest to occlusal plane(COD) and inferior alveolar canal to sagittal plane(CS) were measured and horizontal distance(HD), vertical distance(VD) and nearest distance(ND) were measured. Results: The inferior alveolar canal is located $6.19{\pm}1.21\;mm$ from the R point. Horizontal distance from the R point were $13.07{\pm}2.45\;mm$, vertical distance from the R point were $14.24{\pm}2.41\;mm$ and nearest distance from the R point were $10.12{\pm}1.76\;mm$. The course of the inferior alveolar canal was positioned within $0.61{\pm}0.68\;mm$. The distance from external buccal bone to the inferior alveolar canal was increased from the R point anteriorly. Conclusions: It is considered that the mandibular ramus from the R point to 10 mm anteriorly can be harvested safely at ramal bone grafting.
소엽(蘇葉) 추출물이 백서(白鼠)의 뇌허혈에 미치는 효과
김형우,김부여,조수진,정현우,조수인,Kim, Hyung-Woo,Kim, Bu-Yeo,Cho, Su-Jin,Jeong, Hyun-Woo,Cho, Su-In 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.3
Objectives : Folium perillae (FP) can relieve superficial pathogenic factors to dissipate cold and promote the circulation of qi and regulate the function of the stomach and is often used for interior qi-stagnation. We hypothesized that FP could rescue cerebral ischemia in rats. Methods : The present study was carried out to investigate the effects of FP on cerebral ischemia in terms of regional cerebral blood flow (rCBF) and mean arterial blood pressure (MABP) in rats. Finally, lactate dehydrogenase (LDH) release was investigated, too. Results : In this study, treatment with FP elevated rCBF and MABP levels in dose-dependent manner. Pre-treatment with indomethacin, an inhibitor of cyclooxygenase, inhibited rCBF increase induced by FP effectively. However, FP did not affect stability during cerebral reperfusion. Finally, FP significantly inhibited LD H activity in vitro Conclusions : These results suggest that FP is useful to treat patient with diseases related to cerebral ischemia, because FP can increase rCBF and MABP.