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3차원 적층 출력과 밀링에 의해 제작된 일체형 의치의 인공치 변위 평가
곽영훈,이세한,이경제,김희중,Kwak, Young-Hun,Lee, Sea-Han,Lee, Gyeong-Je,Kim, Hee-Jung 대한치과보철학회 2017 대한치과보철학회지 Vol.55 No.4
목적: 의치상과 인공치가 밀링과 3차원 프린팅 방식에 의해 일체형으로 제작될 때 각기 인공치의 변위를 평가하고자 한다. 재료 및 방법: 밀링과 3차원 프린팅 방식으로 상하악 각기 12개의 의치를 제작하였다. 프린팅에 의해 제작된 상악의치 군은 Group Up이고, 하악의치군은 Group Lp이다. 밀링에 의해 제작된 상악의치 군은 Group Um이고, 하악의치 군은 Group Lm이다. 대조군 상악의치는 소프트웨어상에서 최종적으로 디자인된 것으로 상악은 Group Uc이고 하악은 Group Lc이다. 상하악 의치의 양중절치 사이(AB, ab), 양견치 사이(CD, cd), 양제1대구치 사이(EF, ef), 중절치와 제1대구치사이(AE, ae) 및 중절치와 설측점사이(AG, ag) 의 거리를 측정하였다. 결과: AG와 ag는 상하악 의치 모두에서 프린트된 의치군과 컨트롤 의치군 사이에서 뿐 만 아니라 밀링 의치군과 컨트롤 의치군 사이에서도 통계학적 유의성을 나타내었다(One-way ANOVA, P < .05). 하악 일체형의치에서는 Group Lp와 Group Lm 사이에 ab, cd, ef 모두 통계학적 유의성을 나타내었다. 결론: 밀링과 3차원 프린팅에 의해 제작된 의치의 인공치 변위는 통계학적 유의성이 나타났으나, 임상적으로 매우 양호한 변위량을 보여주었다. Purpose: The purpose of this study is to evaluate the displacement of artificial tooth of monolithic complete denture manufactured by milling and 3D printing method in which the denture base and the artificial teeth are simultaneously made. Materials and methods: Twelve upper and lower complete dentures for each were made by milling and 3D printing method. Group Up and Group Lp are a group of upper and lower dentures made by printing, and Group Um and Group Lm are denture groups made by milling. Group Uc and Group Lc are is a group of finally designed upper and lower dentures respectively. Measurements were performed between both central incisors (AB, ab), both canines (CD, cd), both first molars (EF, ef), between an incisor and a first molar (AE, ae), and between incisor and lingual point (AG, ag) for each upper and lower denture. Results: AG and ag value between printed dentures and original ones as well as between milled dentures and original ones showed a statistically significant difference (One-way ANOVA, P<.05) in both lower and upper monolithic dentures. In the lower monolithic ones, ab, cd and ef value revealed a significant difference between Group Lp and Group Lm (One-way ANOVA, P<.05). Conclusion: Dentures made using milling or 3D printers revealed statistically significant difference compared with those of original data. However, it showed clinically very accurate reproducibility.
Sapphire Glass 기반 다층박막 터치패널구조의 광학특성 연구
곽영훈,문성철,이지선,이성의,Kwak, Young Hoon,Moon, Seong Cheol,Lee, Ji Seon,Lee, Seong Eui 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.3
A conductive oxide-based sapphire glass indium tin oxide/metal electrode and the optical coating, through patterning process was studied in excellent optical properties and integrated touch panel has a high strength. Indium tin oxide conductive oxides of the sapphire glass to 0.3 A at DC magnetron sputtering method of 10 min, gas flow Ar 10 Sccm Ar, $O_2$ 1.0 Sccm the formation conditions of the thin film after annealing at $550^{\circ}C$ for 30min was achieved through a 86% transmittance. In addition, the coating 130 nm hollow silica sol-gel was to improve the optical transmittance of the indium tin oxide to 91%. For the measurement by the modeling hollow silica sol by Macleod simulation and calculated the average values of silica part to the presence or absence in analogy to actual. Refractive index value and the actual value of the material on the simulation the transmittance difference is it does not completely match the air region similar to the actual value (transmission) could be confirmed that the measurement is set to a value of between 5 nm and 10 nm.
프로젝트관리기법 도입 및 적용에 대한 4 개 산업 비교 및 분석
곽영훈(Young Hoon Kwak) 한국경영학회 2002 經營學硏究 Vol.31 No.5
This study presents a methodology to systematically assess organizational Project Management (PM) maturity. This assessment is used to measure and compare organization`s PM level quantitatively. A 5-level Model is introduced to position and determine an organizations current and relative PM maturity. A total of 38 organizations, including 15 Engineering and Construction, 10 Telecommunications, 10 Software Development, and 3 Hi-Tech Manufacturing companies have participated in this study. This study also suggests a step to estimate the return on PM investment (PM/ROI) on an order-of-magnitude basis. First, regression analysis reveals that the organizational PM level and actual cost and schedule performance data from projects representative of the companies are positively associated. The conceptual PM/ROI calculation procedure is then presented to encourage managers investing in PM processes, tools, and techniques. This research provides a solid and comparative analysis methodology on PM practices which in turn can help managers to improve their PM processes and its effectiveness.
곽영훈(Young Hoon Kwak),이영기(Young-Ki Lee),조준형(Jun-Hyung Cho),홍창섭(Chang Seob Hong),김광수(Kwang-Soo Kim),서범석(Bum-Seok Suh) 전력전자학회 2013 전력전자학술대회 논문집 Vol.2013 No.7
본 논문에서는 고전력반도체 모듈의 패키지 열 특성 및 경향을 수치해석(3D-FEM)을 통해 고찰하였다. 전력반도체 소자 하부에 적용한 Thermal spreader의 영향을 크기와 두께 별로 3D-FEM 해석으로 진행하였으며, 실제 MOSFET 100V/600A 모듈 개발제품에 적용하여 소자의 온도, 열 저항 예측 및 측정을 진행 하였다. Thermal spreader의 효과는 열저항 측면에서 thermal spreader 미 적용 대비 약 47% 개선됨을 볼 수 있다. MOSFET 100V/600A 모듈의 열저항 해석결과 는 0.08 W/m-℃로 측정결과(0.086 W/m-℃)대비 약 7% 차이로 잘 일치함을 볼 수 있다.
건물에너지 절감을 위하여 시뮬레이션을 이용한 EMS 적용
곽영훈(Young-Hoon Kwak),천세환(Se-Hwan Cheon),이상문(Sang-Moon Lee),허정호(Jung-Ho Huh) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The purpose of this study is to develop an energy management system and to verify the proposed model by applying energy management technique in a real campus building. In this study the influence of the blind control and dimming control strategies in energy consumption and the energy saving potentials of a lighting system have been investigated by means of simulations with EMS of EnergyPlus. With blind control(application of EMS) and dimming control, light energy consumption and cooling energy consumption are reduced about 50% by baseline model.
기상 예보 데이터와 일사 예측 모델식을 활용한 실시간 에너지 수요예측
곽영훈(Young-Hoon Kwak),천세환(Se-Hwan Cheon),장철용(Cheol-Yong Jang),허정호(Jung-Ho Huh) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.6
This study was designed to investigate a method for short-term, real-time energy demand prediction, to cope with changing loads for the effective operation and management of buildings. Through a case study, a novel methodology for real-time energy demand prediction with the use of weather forecasting data was suggested. To perform the input and output operations of weather data, and to calculate solar radiation and EnergyPlus, the BCVTB (Building Control Virtual Test Bed) was designed. Through the BCVTB, energy demand prediction for the next 24 hours was carried out, based on 4 real-time weather data and 2 solar radiation calculations. The weather parameters used in a model equation to calculate solar radiation were sourced from the weather data of the KMA (Korea Meteorological Administration). Depending on the local weather forecast data, the results showed their corresponding predicted values. Thus, this methodology was successfully applicable to anywhere that local weather forecast data is available.