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AE 기술을 이용한 미세 홈 가공의 모니터링에 관한 연구
김남훈,이은상,이득우,김남경,곽철훈,Kim, Nam-Hun,Lee, Eun-Sang,Lee, Deug-Woo,Kim, Nam-Kyung,Kwak, Choi-Hun 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.3
This paper describes evaluation and monitoring methods of machining characteristics for developed micro grooving machine. Experiments were conducted under various process conditions such as spindle revolution speed, feed rates and depth of groove V and U shape of blade and STD11 were used in this experiment. The status of grooving was evaluated through analysis of the Acoustic emission (AE) signal resulted in each process condition. Based on the analysis, this paper examined the possibility of monitoring adapting fuzzy logic. In conclusion, this paper presented the possibility of monitoring in process adapting AE technology and appropriate micro grooving condition.
김남훈,양정열,문재원,김규보,천지선,Kim, Nam-Hun,Yang, Jeong-Yeol,Moon, Jae-Won,Kim, Gyu-Bo,Cheon, Ji-Seon 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.4
Purpose: Blepharoptosis can result from either congenital or acquired causes. Blow out fracture or facial bone fracture including blow out fracture can be one of the causes. Authors experienced 3 cases of severe blepharoptosis after blow out fracture treated only with observation after reduction of associated fracture. Methods: Reconstruction of orbital wall was conducted on all cases diagnosed as blow out fracture using 3 dimensional computed tomography, and conservative treatment was done on accompanying severe blepharoptosis. Results: At the time of injury, all cases showed severe blepharoptosis requiring frontalis muscle transfer for correction. But blepharoptosis was recovered in an average of 18 weeks without any surgical procedure except reconstruction of orbital wall. Conclusion: Once Blepharoptosis occurred after blow out fracture, thorough evaluation must be done at first. If definitive cause of blepahroptisis cannot be found as authors' cases, injury of oculomotor nerve may result in blepharoptosis. So, as for blepharoptosis after blow out fracture, conservative treatment following reconstruction of fractured orbital wall can be one of good management.
김남훈(Nam-Hun KIm),김동희(Dong-Hee Kim),이상호(Sang-Ho Lee),이상석(Sang-Seock Lee),김민희(Min-Huei Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
This paper presents a implementation of digital motion control system for mduction motor vector drives using the 16M DSP TMS320F240. The DSP controller enable enhanced real time algorithm and cost-effective design of intelligent controllers for induction motors which can be Yield enhanced operation, fewer system components, lower system cost, Increased efficiency and high performance. The system presented are speed and current sensing, sine look-up table and generated SVPWM by fully integrated control software. The developed system in a Implementation are shown a good speed response characteristics results and high performance features The system can be adapted variform motor drive system.
폐루프 자속관측기를 이용한 유도전동기의 직접토크제어 시스템
김남훈(Nam-Hun Kim),김민호(Min-Ho Kim),김민회(Min-Huei Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper presents an implementation of digital motion control system of Induction Motor(IM) vector drives with a direct torque control(DTC) using the 32bit DSP TMS320C31 The DSP controller enable enhanced real time algorithm and cost-effective design of intelligent control for motors which can be yield enhanced operation, fewer system components, lower system cost, increased efficiency and high performance. The system presented are stator flux and torque observer of stator flux feedback model that inputs are current and voltage sensing of motor terminal and rotor angle for a low speed operating area, two hysteresis band controllers, an optimal switching look-up table, and IGBT voltage source inverter by using fully integrated control software. The developed control system are shown a good speed control response characteristic results and high performance features in general purposed 2.2[kW] machine. The system can be adapted variform motor drive system.
김남훈(Nam-Hun Kim),김동희(Dong-Hee Kim),김민희(Min-Huei Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
This paper presents an implementation of digital position control system of induction motor vector drives using the 16bit DSP TMS320F240. The DSP controller enable enhanced real time algorithm and cost-effective design of intelligent controllers for induction motors which can be yield enhanced operation, fewer system components, lower system cost, increased efficiency and high performance. The system presented are position, speed and current sensing, sine look-up table and generated SVPWM by fully integrated control software. The developed system are shown a good position control response characteristic results and high performance features using 22K w induction motor.
구조용 목질재료의 전단파괴기구 해명을 위한 파면해석적 연구
김남훈(Nam Hun Kim),쯔쯔미쥬이치(Juichi Tsutsumi),홍순일(Soon Il Hong),이성재(Sung Jae Lee) 한국가구학회 1999 한국가구학회지 Vol.10 No.1
The ultrastructural characteristics of shear fracture surfaces of laminated wood prepared from major four Korean wood specimens were examined. Commercial urea and urethan resin were used as adhesives for laminated woods of both homospecies and heterospecies. The morphology of fracture surface was observed using an optical microscopy and scanning electron microscopy. Three anatomical failure types were recognized: intercell failure, intrawall failure and transwall failure.<br/> In dry specimen, failure occurred mainly in woods. Laminated woods of softwoods showed mostly intrawall failure and transwall failure of tracheids, and them of hardwoods indicated mainly intrawall failure and interwall failure. Laminated woods prepared with urethan resin showed coarse fracture surface, on the other hand, those prepared with an urea formaldehyde resin had clean surface.<br/> In wet specimen, failure occurred dominantly in glue line. Intrawall failure and flags were characterized in laminated wood prepared with urethan resin. In heterospecies laminated woods, failure was occurred mainly in softwood.<br/> Consequently, fracture morphology of laminated wood may be influenced by adhesives, moisture content, species and anatomical characteristics.<br/> Keywords: Fractography, Laminated woods, Shear stress, Morphology, Wood failure, Intrawall failure, Intercell failure, Transwall failure<br/>