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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.
image Color Appearance Model을 기반으로 한 HDR Tone Mapping 시스템 설계
김남훈(Nam-Hun Kim),오상협(Sang-Hyub Oh),이동호(Dong-Ho Lee) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10
일반적으로 HDR(High Dynamic Range) 영상을 제한적인 다이내믹 레인지를 가진 CRT나 LCD같은 디스플레이 장치에 표현하기 위해서는 톤 매핑(tone mapping)이란 방법을 통해야 한다. 톤 매핑의 대부분은 Photos hop CS3, Photomatix와 같은 컴퓨터 소프트웨어를 사용한다. 본 논문에서는 정지 영상분야에서 사용될 수 있는 하나의 톤 매핑 모델 중 하나인 iCAM((image Color Appearance Model)을 기반으로 한 HDR Tone Mapping 시스템 설계를 하드웨어 언어(HDL)중 하나인 verilog를 이용하여 구현하는 방법을 제안한다. 제안한 verilog로 구현하는 방법은 소프트웨어 방법보다 시간을 줄일 수 있으며, 차후 칩으로 만들어질 경우 공간 또한 줄일 수 있다. 시뮬레이션 프로그램으로 ModelSim 6.3f, MATLAB R2009a를 사용하였으며, ALTERA사의 IP(Intellectual Property)를 이용하여 verilog code로 구현된 시뮬레이션 결과와 MATLAB code로 구현된 시뮬레이션 결과의 오차에 큰 차이가 없음을 확인하였다.
김남훈(Nam-Hun Kim) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
Manufacturing process of plugs is firstly performed in the making of FRP yacht so it is an essential process for making original form. In the developed countries, it has been useful to manufacture structures of streamlined forms or complex forms, which have been difficult to manufacture due to limits of the traditional hand-made technology, by introducing 5-axis machining technology. In this study, the factors that affect most in the machining were found by using Taguchi Method in order to select the optimized machining conditions for 5-axis machines, and the ways to improve the surface roughness of machined products by applying those factors.