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홍성욱(Seong-Wook Hong),최춘석(Chun-Seok Choi),이찬홍(Chan-Hong Lee) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.8
High-speed spindle systems typically employ angular contact ball bearings, which can resist both axial and radial loading, and exhibit high precision and durability. We investigated the effects of the arrangement of the angular contact ball bearings on the dynamics of high-speed spindle systems. The spindle dynamics were studied with a number of spindle-bearing models, and the location of the bearings was varied, along with the rotational speed and the preload. A finite element spindle model and a bearing model were used, and simulated data showed that the bearing arrangement significantly affected the spindle dynamics. Furthermore, the main effects were due to the cross coupling terms between the transverse and rotational motions of the ball bearings. The coupling stiffness terms were found to influence the spindle dynamics, depending on the mode shapes. An extensive discussion is provided on the effects of the bearing arrangement on the dynamics of the spindle.
임상연구 : Remifentanil과 Ketamine 전투여가 Propofol 정주 시 발생되는 혈관통에 미치는 영향
홍성욱 ( Seong Wook Hong ),곽경화 ( Kyung Hwa Kwak ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.3
Background: There is a high incidence of pain associated with an intravenous injection of propofol, and different methods have been used in an attempt to minimize the incidence and severity of this pain. This study compared the effect of a ketamine pretreatment with that of a remifentanil pretreatment on the pain associated with a propofol injection. Methods: 225 ASA physical status 1-2 adult patients scheduled for elective surgery were enrolled into this randomized double blind study. The patients received 2 ml of saline (n = 45), 2 ml of ketamine 20 mg (n = 45), 2 ml of remifentanil 0.01 mg (n = 45), or 2 ml of remifentanil 0.02 mg (n = 45) or 2 ml of remifentanil 0.03 mg (n = 45) 30 seconds prior to administering 2 mg/kg of 1% propofol. An anesthesiologist who was blinded to the study asked the patients to evaluate the pain using a four-point scale (none, mild, moderate, severe). Results: The remifentanil 0.02 mg, remifentanil 0.03 mg and ketamine groups showed significantly less frequent and intense pain than the saline group (P < 0.05). The remifentanil 0.02 mg and 0.03 mg provided as much pain relief as ketamine (P > 0.05), but the remifentanil 0.01 mg did not (P < 0.05). There was a similar incidence of injection pain in the remifentanil 0.02 mg and remifentanil 0.03 mg groups. Conclusions: An intravenous remifentanil 0.02 mg or remifentanil 0.03 mg pretreatment is as effective in alleviating the pain associated with a propofol injection as a intravenous ketamine pretreatment. The remifentanil 0.03 mg pretreatment had a similar analgesic effect relative to the remifentanil 0.02 mg pretreatment. (Korean J Anesthesiol 2006; 51: 302~7)
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.
정밀 위치결정 시스템의 진동 저감을 위한 입력성형 기법
홍성욱(Seong-Wook Hong),박상원(Sang-Won Park),W. E. Singhose Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.4
본 논문은 정밀 위치결정 시스템의 잔류진동을 효과적으로 제거할 수 있는 입력성형기법을 소개하고, 실시간 입력성형기법을 적용하는 방법을 설명하였다. 또한 두 가지 응용 분야에 대한 실험결과를 바탕으로 입력성형기법의 성능을 고찰하였다. 일반적으로 입력성형기법은 정밀 위치결정 시스템에 대해 동작 완료시간을 단축 시키는 효과가 있을 뿐만 아니라 위치결정 정밀도를 향상시키는 효과가 있다. 그리고 되먹임제어 방법에 비해 적용방법도 간단하며 저렴하게 구성할 수 있다는 장점이 있으므로 많은 정밀 위치결정 시스템에 유용할 것으로 생각된다.