http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
도르래를 이용한 파력발전기 프로토 타입 개발에 관한 연구
정현석(Hyun-Seok Jung) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.1
From the ancient times, there are waves in the ocean. And all the moving body have energy. We have a kind of hope to convert the wave energy into electric one. Finally we can find out a power generator mechanism that mainly use the principle of pulleys. We have made drawings for this and completed the wave energy converter. This wave energy converter consists of several pulleys, rope, generator, buoys and anchors, The distance between an anchor and buoy is changed according to the hight of waves. Several sets of anchors, pulleys and buoys can make the movement of rope, and the ropes wind up a converter axis. In case of 1 meter movement of the buoy, the winding distance will be amplified 2 or 3 times if we use several moving and fixed pulleys. Based on this concept, we developed 2 kind of prototypes. One is for the test in the laboratory and the other is for the field test. Through the two test, we could confirm the usability of this mechanism.
정현석(Hyun-Suk Jung),박수정(Su-Jung Park),유중학(Joong-Hak Yoo) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.5
In this study, an experiment was conducted using a 3D scanner, commonly used in reverse engineering techniques, and the newly introduced CT measuring machine. The hole, width, and angle of specimens having various shapes were designated, the error rates in dimensional modelling generated during scanning with each device were compared, and the models were printed using a 3D printer. A secondary comparative analysis of the two printed specimens was conducted; the causes of dimension errors that occur during the printing process after scanning with each device and the differences associated with variation in shape were also analyzed. Based on the analysis results, the featured shape for each scanning application method and issues to consider in reverse engineering were presented, and the use of the CT measuring machine was recommended as a method to minimize error rates in dimensions and ensure efficient reverse engineering.
분리형 데크플레이트 고정장치 상세에 따른 시공 시 구조 안전성 평가
정현석(Jung, Hyun-Suk),이승용(Lee, Seung-Yong),최창식(Choi, Chang-Sik) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.12
In this study, a slab system using a new concept of deck plate that can be easily fixed and separated was developed, and the optimized detail that can be separated during construction and the safety of the construction load were presented. First, in order to examine the load acting on the contact surface of the fixing device, a finite element analysis was performed to predict and compare the structural behavior of experimental results. As a result of the analysis, it was confirmed that the stress distribution showed a pattern in which the stress was concentrated to the curved part of the connecting member at the starting point of the load control, and the shape of the fixing device was determined based on the finite element analysis result. Tensile tests were performed using UTM with a capacity of 1000 kN to confirm the fixing performance of the fixing device based on the finite element analysis results. As a result of the fixing device test, it was found that the improvement of the cross-sectional shape has an effect on the fixing performance of the fixing device, and accordingly, the thickness reduction was also possible. Next, construction load test was conducted to examine the structural safety of the local failure of the fixing device during the construction, which is a problem that may occur when developing a removable deck plate. As a result of the deflection test, when considering the design safety factor in the construction load test conducted to examine the deflection, it was found that the installation distance of the fixing device should be within a maximum of 300mm. It is necessary to secure a sufficient safety factor based on the result of this technology development where there is a concern about the construction load and the concentrated load caused by the equipment in construction.