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김광연(K.Y.Kim),조종두(C.Cho) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
The objectives of this study were to investigate the behavior of bolted shear and moment joint. An finite element investigation were performed to study the behavior of the bolted joints.<br/> The commercial package ABAQUS was used to obtain the stress distribution of elastic and plastic region. The results of analyses. the method used to model the bolt pretensions is temperature changes requirde to produce the desired pretensions. Analyses were performde to investigate the effects of pretension in the bolted joint behavior of Elastic-plastic range. The behavior of a preloaded bolt which clamps two steel plates together is invesigated. Some discrepancies have been found but seem to be insignificant in relating to the behavior of the bolt. The response of bolts differ under hand tightened and preloaded conditions which directly influences the initial stiffness of the connection.
산업용 인버터의 Power Loss Ride-Through
전미림(M. R. Jeon),김광연(K. Y. Kim),김정빈(J. B. Kim),김경서(K. S. Kim) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
일반적으로 유도전동기를 구동시키기 위한 범용 인버터는 입력 전원에 정전이 발생하였을 경우 부하에 따라 수msec에서 수백msec 안에 저전압 트립이 발생하여 PWM 출력이 차단된다. 부하의 관성이 큰 경우 전원이 복구 되었을 때, 기존의 속도로 제어되기 위해서는 부하가 완전히 멈춘 후 인버터를 구동시키고, 다시 큰 관성의 부하를 가속하는데 긴 시간이 필요하다. 본 논문은 유도전동기를 V/f 제어방법으로 운전할 경우 정전이 발생했을 때 인버터의 출력을 차단하지 않고 연속적인 제어를 행하는 Ride-Through 방법으로서 부하의 관성 에너지를 인버터 직류단에 회생시키도록 출력 주파수를 제어하는 방법을 제안하고 실험을 통해 이를 검증하였다.
대장암 (大腸癌) 및 담석증을 (膽石症) 동반한 전대장에 (全大腸) 걸쳐 발생된 다발성 대장게실증 (大腸憩室症)
배철환(C H Bae),전승준(S J Jun),조왕기(W K Cho),곽정재(J J Kwaak),이만호(M H Lee),이상종(S J Lee),김광연(K Y Kim) 대한소화기학회 1984 대한소화기학회지 Vol.16 No.1
Mortality rate for large bowel cancer in this country have slightly increased in recent years but are still much lower than those in western countries, while Japanese and Caucasians living in Hawaii are the same risk of developing this tumor. Diverticulum is also extremely low incidence in the Koreans, which correspond to the view that diverticulosis seldom occurred in population with low risk to colorectal carcinoma. We have seen recently a very interesting case of multiple diverticulosis of entire colon associated with colonic carcinoma and gallbladder stone. This 72-year-old man had had frequent occasion of upper abdominal colicky pain and melena since about couple years ago, when his condition was diagnosed as multiple colonic diverticulosis and gallstone disease at this hospital. The medical conservative treatment was given for a while with transient improvement. He was admitted to this hospital because of intractable abdominal pain and vomiting on 27th september 1983. He appeared acutely and chronically ill and moderately anemic. There was some diffuse tenderness overall abdomen but no ascites or masses. Rectal examination was no abnormalities. Several test for occult blood in stool disclosed negative, His condition was not responded for the medical conservative treatment. He received the surgical operation on the 11th hospital day. Post operative abnormalities was additionally found a large tumor along the right colonic surface which was proved as well differentiated adenocarcinoma, associating with gallbladder stone and numerous colonic diverticulosis just like preoperative findings.
백진욱(J. W. Paek),전종욱(J. W. Jeon),김광연(K. Y. Kim),김정빈(J. B. Kim),김경서(K. S. Kim) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.2
본 논문에서는 장력 검출 장치(로드셀, 댄서 등) 가장착되어 있는 생산 설비에서 강선, 강판, 제지, 섬유, 비닐 등과 같은 소재의 장력을 정밀하게 제어하기 위한 인버터의 장력 제어 전용 PID 제어기와 직경 또는 소재의 두께를 실시간으로 추정하여 인버터의 출력 주파수를 보정하는 추정기를 제안한다. 본 논문에서 제안된 방법을 다양한 용량(0.37㎾~160㎾) 대의 인버터에 탑재하여 실제 부하에 적용함으로써 산업 현장에서 요구하는 수준 이상의 우수한 제어 성능을 나타냄을 확인하였다.