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두부방사선규격사진 촬영 시 유도방법에 따른 자연두부자세의 차이 및 재현성에 관한 연구
송진명,이기헌,,황현식 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.5
두부방사선규격사진에서는 매 촬영 시마다 두부의 수직적 회전 정도를 일정하게 유지하기 위하여 두부자세의 재현이 필요하다. 본 연구는 유도방법에 따른 자연두부자세의 수직적 두부회전 정도의 차이를 비교하고 각 두부자세의 재현성을 평가하기 위하여 시행되엇다. 20대 성인 남녀 30명을 연구대상으로 하여 head posture allgner를 이용한 방법(HPA법)과 self balance posture를 이용한 방법(SBP법)으로 자연두부자세를 유도하여 측모 및 정모두부방사선규격사진을 각각 한 달 간격으로 촬영한 후, 측모두부방사선규격사진 상에서 유도 방법에 따른 수직적 두부회전 정도의 차이를 비교하는 한편, 측모 및 정모두부방사선규격사진에서 시간 간격을 두고 동일 방법으로 유도하여 촬영한 두 사진 상의 동일 계측항목 간 차이를 비교함으로써 각 두부자세의 유도방법에 대한 재현성을 평가하였다. 연구결과 SBP법으로 유도한 자연두부자세는 HPA법에 의해 유도된 자연두부자세보다 평균 2.79˚ 고개를 숙인 자세로 나타났다. 또한 HPA법 또는 SBP법을 이용하여 시간 간격을 두고 각각 2회 촬영한 측모두부방사선규격사진과 정모두부방사선규격사진 상의 계측치는 모든 계측항목에서 통계적으로 유의한 차이를 보이지 않는 것으로 나타났다. 본 연구 결과는 HPA법과 SBP법으로 유도한 자연두부자세가 모두 재현성이 있음을 나타내는 것으로, 두부방사선규격사진 촬영 시 재현성을 높이기 위하여 HPA법과 더불어 SBP법도 임상적으로 사용될 수 있음을 시사하였다. The purpose of this study was to compare the degree of vertical head rotation and to evaluate the reproducibility of natural head posture (NHP) according to two guiding methods. The head posture aligner (HPA) method and the self balance posture (SBP) method. The subjects consisted of 30 adults. On the first day. Lateral and frontal cephalometric radiographs were obtained through the two guiding methods. One month later. lateral and frontal cephalometric radiographs were obtained again through both guiding methods. The degrees of vertical head rotation of both guiding methods were compared and the reproducibility was evaluated for each guiding method. A comparison of the degrees of vertical head rotation for the two methods revealed that the vertical head posture was lower in the SBP method than in the HPA method by an average of 2.79˚. All measurements obtained using the HPA and SBP methods with a time interval of one month did not show any significant difference in lateral and frontal cephalometric radiographs. The results of the present study suggest that the SBP method may be used as an alternative to the HPA method in case the HPA method can not be applied.
Real-Time IR을 이용한 Polyesterimide의 경화거동 연구
홍진후,송주명,김현경,박미영,박기주 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.2
Polyesterimide for enamel Wire coating was synthesized and its curing reaction was monitored by real-time FT-IR. Infrared 1019cm^(-1) band was used to monitor the curing process. Results of in-situ analysis showed that evaporation of ethylene glycol and transesterification started from 100℃. When curing temperature was higher than 200℃, ester reaction was favored over the ether reaction. It was concluded that curing temperature is the key factor to control the thermal stability of the enamel wire coating.
A Study on Aerodynamic Features of Rotating Cooled Gas Turbine Blades
Ki Myoung Song(송기명),Wanjae Kim(김완재) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In this paper, very large computation was done to closely capture and present some of aerodynamic details of cooled gas turbine blades. For geometry side, highly complicated real world geometry of cooled turbine blade is modeled without any simplification. For grid and solution side, very thin first layer of 10<SUP>-4</SUP>mm was generated with smooth grid transition to the core region to adequately resolve near wall flow behaviors. From the result, firstly, rather complex flow features near end-walls and blade tip are clearly visualized and explained. Secondly, the results were further compared with those obtained from two dimensional CFD model and oversimplified three dimensional models.
A Comparative Study on Flow Physics of Cooled and Uncooled Gas Turbine Blades using Numerical Method
Ki Myoung Song(송기명),Wanjae Kim(김완재) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
To better understand highly complex flow features around gas turbine cooled blades, a numerical study that compares some of flow physics in rotating cooled and uncooled blades was done. Very fine grid system of over 520M cells which contains every heat enhancement feature such as rib turbulators, trailing edge slot arrays as well as cooling holes is used for the cooled gas turbine blade CFD analysis and for the uncooled blade, the same surface and volume grid quality are maintained. Vortices along with other essential flow variables were calculated and visualized using the Reynolds- Averaged Navier-Stokes equation closed by 2 equation K-w SST turbulence model. Primary and secondary vortices were observed both in cooled and uncooled CFD results however, vorticity in cooled blade overwhelmed in almost every flow region over that of uncooled blade due to high speed cooling flow discharge and mixing.
Wire-metallizing을 이용하여 제작된 친수성 Al 표면의 시간에 따른 표면에너지 변화실험
송기명(Ki Myoung Song),김민수(Min-soo Ghim),조영삼(Young-Sam Cho) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this study, aluminum hydrophilic surface was fabricated using wire-metallizing. Firstly, for the better adhesion of wire-metallizing, the surface of aluminum substrate was roughened by aluminum-oxide particle-blasting method. Afterward, using LFS (Liquid Flame Spray) apparatus, aluminum wire was molten and sprayed as nano particles onto the blasted surface. Subsequently, the surface of Aluminum became hydrophilic surface which was verified via water contact measurement. The surface energy was represented by measured water contact angle. Moreover, the morphology of Al surface was observed via FE-SEM (Field Emission Scanning Electron Microscope) and atomic composition ratio were confirmed by EDS (energy dispersive X-ray spectroscopy). Moreover, water contact angle, morphology, and atomic composition ratio were analyzed with respect to time.
마이크로파를 이용한 다시마의 산 가수분해와 에탄올 생산성
송명기(Song, Myoung-Ki),나춘기(Na, Choon-Ki) 한국신재생에너지학회 2013 신재생에너지 Vol.9 No.2
The efficiency of microwave-assisted acid hydrolysis of seaweeds for the production of ethanol was investigated and its effect on hydrolysis into reducing sugar and fermentation into ethanol evaluated as compared with those by conventional heating. A brown seaweed, Laminaria japonica (10-100g/L) was hydrolysed under dilute acidic condition (0.5N H₂SO₄, 100?C) with two sorts of heating: microwave irradiation for {leq}10min and conventional heating for 10-60min. Microwave-assisted hydrolysis was shown to be more efficient. A similar range of reducing sugar and ethanol yields as with the conventional autoclave heating procedure({geq}30min) was observed, but it was obvious that production of ethanol from microwave-assisted hydrolysis had a 3 times faster reaction rate leading to very short production times, lower energy consumption/loss than from the conventional heating mode, and higher biomass loading without significant reducing ethanol yield, thus microwave-assisted acid hydrolysis is a potential alternative method for more effective hydrolysis of Laminaria japonica.