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홍성욱(Seong-Wook Hong),최성환(Seong-Hwan Choi) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.2
This paper presents an efficient dynamic modeling method for multi-stepped rotor system using effective spring elements to take into account the structural weakening effect due to the steps. This paper demonstrates that the Timoshenko shaft model give rise to a significant error in the case of multi-stepped rotors. An effective bending spring model is introduced to represent the structural weakening effect in the presence of steps. The proposed modeling method is validated through a series of simulations and experiments. Finally, a spindle is dealt with as an analysis example.
홍성욱(Hong, Seong-Wook),양진국(Yang, Jin-Kook),최유진(Choi, Yu-Jin),안태한(Ahn, Tae-Han) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
The evaluation of construction technology services is to determine whether project performance for the contractor and the participating engineer as a construction manager. However, the contractor and the participant engineers have a difficult aspect due to the lack of preparation period and the other field movement of the participating engineers. The reason is that the evaluation period progresses at the completion time of the service. In this respect, this study attempts to extract the critical success factors in the evaluation. The method is to analyze the relative importance of each factor through the AHP analysis after extracting the factors through the in-depth interview with the experts. The above analyzed results will provide a work standard for the systematic implementation of construction management services.
원자간력 현미경을 이용한 초소형 마이크로 부품 표면 형상 측정 시스템 개발
홍성욱(Seong-Wook Hong),고명준(Myung-Jun Ko),신영현(Young-Hyun Shin),이득우(Deug-Woo Lee) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.6
This paper proposes a measurement method for the surface shape of micro-parts by using an atomic force microscope(AFM). To this end, two techniques are presented: First, the measurement range is expanded by using an image matching method based on correlation coefficients. To account for the inaccuracy of the coarse stage implemented in AFM, the image matching technique is applied to two neighboring images intentionally overlapped with each other. Second, a method to measure the shape of relatively large specimen is proposed that utilizes the inherent trigger mechanism due to the atomic force. The proposed methods are proved effective through a series of experiments.
증례보고 : 관상동맥 우회술 중 내시경하 복재정맥 수확동안 발생한 과탄산혈증
홍성욱 ( Seong Wook Hong ),김시오 ( Si Oh Kim ),백운이 ( Woon Ei Baek ),이종태 ( Jong Tae Lee ),조준용 ( Jun Yong Cho ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.5
Hypercarbia is a potential complication during laparoscopic surgery. However, is more likely to occur in extraperitoneal surgery than in intraperitoneal surgery because insufflated CO2 gas can diffuse easily into the surrounding tissues. We report the anesthetic course and complications encountered during endoscopic harvesting of a saphenous vein with CO2 insufflation in coronary artery bypass surgery. Although the surgery was successful, the patient developed signs and symptom of CO2 absorption: tachycardia, hypertension, hypercarbia and acidosis. Possible mechanisms are presented, along with a discussion of the prompt diagnosis and treatment. For the management of laparoscopic extraperitoneal surgery, care must be taken to monitor the CO2 insufflation pressure, perform a routine examination and palpation of the chest wall, use of N2O with caution, increase the level of ventilation to eliminate CO2, and excluding other causes of subcutaneous emphysema and hypercarbia. (Korean J Anesthesiol 2006; 51: 622~6)