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손재환 ( Jae Hwan Son ),강해동 ( Hae Dong Kang ),성수환 ( Su Whan Sung ),권우진 ( Woo Jin Kwon ),노규익 ( Kyoo Ik Noh ) 한국경영공학회 2015 한국경영공학회지 Vol.20 No.1
We investigated if there is a quality improvement by retrofitting extrusion process for the production of environment-friendly ESP insulation that has been widely used because of its good adiabaticity and strength in this study. We could find better adiabaticity and strength, proved from the microscope investigation and thermal conductivity data of the ESP insulation produced by using environment-friendly vesicating gas of n-butane or DME. And we realized that the fluidity of the polymeric material can be improved and the carbonization can be suppressed by replacing the single screw by the twin screw. The optimal operating condition of the initial temperature of the extruding machine and velocities of the first and second screws were obtained through CFD analysis, resulting in better profiles of the pressures, temperatures and flow rates. We believe that the analysis, measurement and retrofitting methodologies in this study can contribute much to improving the extrusion process for the production of environment-friendly ESP insulation.
손재환(Jae-Hwan Son),강해동(Hae-Dong Kang),노규익(Kyoo-Ik Noh),장근석(Jang-Geun Suk),최원식(Won-Sik Choi) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.6
Construction heat insulating material for construction is used in large amounts in industry. In the manufacturing process of this insulation material, a thermal insulation material is completed while a polymer in a liquid state passes through Hall breaker. At this time, the quality and form of a product are determined by a hole in the breaker according to the oil pressure of the fluid and the change of the flow velocity. The friction wear action with regard to partner movement between the two levels of quality of materials affects the performance and the lifetimes of machine parts. In this study of a friction test, SM45C, which is a material used to create brake holes, was used. PVC was used to create the specimen. Moreover, an experiment divided a lubricous state and an unlubricated condition. The resulting value over the load of a pin, the revolving speed of a disk, and the standby state of an experimental result disk could be acquired.
네르구바타르 엥클렌(Nerguibaatar, Enkhlen),엥크바야르 운드라흐(Enkhbayar, Undrakh),강해동(Kang, Hae-Dong),강동주(Kang, Dong-Ju),허균(Heo, Gyun) 동북아시아문화학회 2019 동북아시아문화학회 국제학술대회 발표자료집 Vol.2019 No.10
The purpose of this study is to introduce Mongolia’s educational system and educational method. We also compared in the view point of educational method between Korea and Mongolia. In this study, we use PMI method for comparing Mongolia’s educational system with Korea. In the PMI frame, we can introduce the characteristics of Mongolia’s educational system and educational method, and also compare to those of Korea.
손재환(Jae-Hwan Son),한창우(Chang-Woo Han),강해동(Hae-Dong Kang),노규익(Kyoo-Ik Noh) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
건축 단열재를 생산하는 1, 2차 압출기의 주요구성품은 기어박스, 기어부, 축 모델로 구성된 기어구동부이다. 본 연구에서는 기어, 베어링, 모터 발열로 인한 발생되는 기어박스 모델의 열전달, 열응력 해석을 통하여 최대 응력 및 변형량을 계산하였다. 그리고 기어부의 접촉해석 해석을 통하여 최대 응력 및 변형량을 계산하였다. 기어박스 및 기어부의 응력 및 변형량 해석을 통해 1, 2차 압출기가 정적으로 안전함을 알 수 있었다. 그리고 축모델에 대한 회전체 동역학 해석을 통해 계산된 Campbell의 위험속도를 판단해 볼 때 동적으로도 안정하다 판단된다. 따라서 1, 2차 압출기의 기어구동부에 대한 유한요소해석 결과 정적 및 동적으로 안정함을 알 수 있었다.
멀티 롤 포밍 공정의 품질 안정성에 대한 해석 및 실험적 연구
손재환(Son, Jae-Hwan),한창우(Han, Chang-Woo),류경진(Ryu, Kyung-Jin),강해동(Kang, Hae-Dong),김철홍(Kim, Chul-Hong) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.10
품질 향상을 위해 연속적인 소성 변형을 이용한 롤 포밍 공정에 피어싱, 벤딩, 트리밍 등 별도의 가공공정을 통합한 볼 슬라이드 레일의 멀티 롤 포밍 공정의 필요성이 대두되고 있다. 하지만 프레스기의 진동 및 소음은 이 공정에서 생산되는 슬라이드 레일의 품질 저하를 유발한다. 본 연구에서는 롤 포밍 유한요소 프로그램으로 최적 변형률을 고려하여 롤을 설계하 였다. 그리고 멀티 공정의 정적 안정성을 예측하기 위해 구조해석 프로그램으로 프레스기에 대한 응력 및 변형량을 계산하였 다. 또한 공진영역에서의 장치들의 운전을 회피하기 위해 Modal 해석을 통해 1, 2차 모드에서의 고유진동수를 계산하였다. 그 결과 공정의 동적 안정성 개선을 확인하기 위해 마이크로폰과 가속도계를 이용하여 기존 및 연구 공정들의 소음, 진동의 크기를 비교하였다. 그리고 기존 및 연구 공정으로 생산되어진 레일의 폭 치수와 표면거칠기를 측정하였다. 따라서 해석 및 실험적 연구를 통해 멀티 롤 포밍 공정이 안정하다는 것을 알 수 있었다. It is faced with the necessity of multi roll forming process of the ball slide rail which is made by adding the separate manufacturing processes, piercing, bending, trimming, to the roll forming process of a continuous plastic deformation, to improve the quality. However, the vibration and noise of the press machine in this process leads to the quality degradation of slide rail manufactured in this process. In this study, the roll was designed considering the optimal strain rates by the roll forming program with finite element method. And to estimate the static stability of the multi process the Von-Mises stress and deformation on the press was calculated with a structural analysis program. Also, to avoid driving systems in the resonance region their natural frequencies in the 1st and 2nd mode were calculated through the modal analysis. To verify its dynamic stability improvement the magnitudes of noise and vibration in the existing and studied system were compared using a microphone and accelerometers. And the widths and surface roughnesses of the rails which had been produced in the existing and studied process were measured. Therefore, it is known that multi roll forming process is stable in the analytical and experimental study.
상태천이를 이항분포로 모델링한 HMM을 이용한 한국어 숫자음 인식
이석우,배건성,강해동 경북대학교 전자기술연구소 1992 電子技術硏究誌 Vol.13 No.1
Experimental results for the spoken Korean-digit recognition with the HMM whose state transitions are modeled by the binomial distribution are presented. Based on the Chang and Bayoumi's method, we derived the formula for estimating the model parameters. The observation sequences of the speech signal were modeled by mixture Gaussian autoregressive densities. The performance of the conventional HMM and the HMM with binomial distribution were compared by varyng the number of states and mixtures.
진성일,배건성,박현화,강해동 경북대학교 전자기술연구소 1991 電子技術硏究誌 Vol.12 No.1
Taking advantage of the property that Korean digit is a monosyllable word, we proposed a spoken Korean-digit recognition scheme using the multi-layer perception. Dynamic spectral features obtained from the linear regression of cepstrum were used as an input vector of neural network. The effects of the number of nodes in the hidden layer to the recognition rate and learning rate were investigated.