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장혁수(H. S. Chang),박영재(Y. J. Park),장윤석(Y. S. Chang),최재붕(J. B. Choi),김영진(Y. J.Kim),천풍환(P. H. Chun),공재연(J. Y. Kong) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Conveyor-type transporters have been widely used as a typical delivery system of semi-conductor, FPD and other ITrelated products. However, as the IT-product is getting larger in size and higher in resolution, several problems are caused by mechanical contacts between the transporter and target object. In this context, recently, lots of efforts are being devoted for development of various contact-free handling systems to get rid of defects and oil contaminations. The objectives of this paper are to characterize suspension mechanisms and to investigate air flow effects on air levitation transport system. For this purpose, a series of CFD analyses were carried out and the simulation data showed a good agreement with the corresponding experimental ones. It is anticipated that the promising result can be used as a basis for concept design of the transport system.
권영기 ( Young Kee Kwon ),장혁수 ( Hyuk Soo Chang ),김병훈 ( Byung Hoon Kim ),박철희 ( Choal Hee Park ),김천일 ( Chun Il Kim ) 대한외상학회 2010 大韓外傷學會誌 Vol.23 No.1
Purpose: High-grade (III, IV, V) renal injury may need interventional management. We investigated whether the selective embolization of the renal artery is effective for the treatment of major renal injury in comparison with emergency renal exploration. Methods: We retrospectively reviewed the medical and radiologic records of patients who underwent surgery or embolization for renal injury (Grade III, IV, V) between January 1990 and December 2007. We analyzed the change in treatment method before and after 2000, the blood pressure, the hemoglobin at the time of visit, the hospital days and the complications in patients who received surgery or embolization. Preserved renal functions of the embolized kidneys were identified by using enhanced CT. Results: Cases of surgery and embolization were 37 and 13, respectively: 5 and 4 in renal injury grade III, 17 and 6 in grade IV and 13 and 3 in grade V. Cases of surgery and embolization were 33 and 1 before 2000 and 2 and 12 after 2000, repectively: embolizations increased after 2000. No significant differences in mean diastolic pressure, hemoglobin, hospital days and complications existed between the surgery and the embolization groups (p>0.05). However, the transfusion volume was significantly smaller in the embolization group (p<0.05). One postoperative complication occurred in the surgery group. We identified the preserved renal functions of the embolized kidney by using enhanced CT. Conclusion: Embolization could be one treatment method for high-grade renal injury. Thus, we might suggest selective embolization a useful method for preserving the renal function in cases of high-grade renal injury. (J Korean Soc Traumatol 2010;23:16-20)
장태규 ( Tae Kyu Jang ),임수연 ( Su Yeon Lim ),배진곤 ( Jin Gon Bae ),장혁수 ( Hyuk Soo Chang ),박준철 ( Joon Cheol Park ),이정호 ( Jeong Ho Rhee ),김종인 ( Jong In Kim ) 대한산부인과학회 2011 Obstetrics & Gynecology Science Vol.54 No.2
Interlabial mass in infant is not common. Because of similarity of symptoms and signs of those mass and less experience of gynecologist due to those rarity, differential diagnosis is not easy. In infant, there are five common interlabial masses which are prolapsed ectopic ureterocele, urethral prolapse, paraurethral cyst, hydrocolpos and rhabdomyosarcoma. Ureterocele with duplex ureter might be diagnosed, however prolapsed ureterocele through urethra is extremely rare. We found 18 months old girl with interlabial mass and diagnosed as prolapsed ectopic ureterocele by ultrasonography, magnetic resonance imaging and voiding cystourethrography. We managed by endoscopic incision of ureterocele successfully. So we report this case with a brief review of associated literatures.
김상돈,장혁수 한국화학공학회 1979 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.17 No.6
삼상(액체-기체-고체) 유동층 및 삼상 유동층내에 기포를 분쇄할 목적으로 혼합한 부동물질이 함유된 층내의 각상의 체유량을 비교적 넓은 범위의 유속 조건에서 측정하였다. 실험은 직경이 25.4㎝인 유동층 반응기에서 행하여졌다. 유체의 속도, 입자의 크기, 부동물질의 모양 및 부동물질과 입자의 체적비가 각상의 체유량 및 층기공율(층팽창)에 어떠한 영향이 있는가를 구명하였다. 유동층내의 입자와 부동물질의 체적비가 10% 이상인 경우의 삼상 유동계에서는 부동물질이 기포를 현저하게 분쇄함을 알았으나 체적비가 10% 이하인 경우에는 부동물질이 기포를 분쇄하는 효과가 크지 못함을 알 수 있었다. 실험결과는 입자의 Reynolds 및 Froude Number 및 부동물질과 입자간의 표면적비의 함수의 실험식으로 나타내었다. The individual phase holdups in three(liquid-gas-solid) phase fluidized bed and the bed of particles with floating contactors(cylindrical or spherical) for breaking bubbles have been measured over a wide range of liquid and gas velocities. Experiments were carried out in a 25.4㎝-diameter fluidized bed. The effects of fluid velocity, particle size, shape of floating contactors and volume ratio of floating contactors to solid particles on bed porosity and phase holdups were determined. Beds of particles and floating contactors having a volume ratio exceeding 10% were found to have a significant bubble breaking potential. In contrast, beds of particles and floating contactors having the ratio below this value were found to have insignificant bubble breaking potential. The data were correlated empirically by equations involving particle Reynolds and Froude numbers and surface ratio of floating contactors to particles.