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안석희(Seok-Hee Ahn),최국진(Kook-Jin Choi),이승호(Seung-Ho Lee),김수호(Soo-Ho Kim),홍대선(Dae-Sun Hong) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Since an industrial robot has been widely used in diverse areas, we need to reduce energy consumed for such a robot as much as possible. So In this study, I performed the optimization of the thickness and shape of a wall-climbing robot in order to reduce its weight. I executed the optimization of a thickness and a shape that minimizes the weight by making the measurement of one side as a design variable while having the thickness of plate and arm of robot as an objective function. As a result of carrying out the optimization work by using the optimization method, I could confirm the reduction of the total weight of a robot.
안석희(Seok-Hee Ahn),최국진(Kook-Jin Choi),홍대선(Dae Sun Hong) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.6
Most of tasks for vertical surface work in shipyard have been accomplished by human workers. However, such manual work often causes injury to workers, also the production cost becomes high due to increasing individual wage. To cope with the circumstance, shipbuilding companies try to introduce wall-climbing robots for carrying out such kind of tasks. In designing a wall-climbing robot, it is essential to minimize its own weight to improve the performance such as moving speed and power saving. For such purpose, this study proposes a method of optimal design for a wall-climbing robot using a genetic algorithm with multi-objective function. Specifically, the thickness of the robot base is minimized to reduce the weight while maintaining the allowable strength and avoiding the resonance frequencies. The proposed method is applied to the design of a wall-climbing robot, and the result shows that the method is useful at an early design stage.
구교당,안석희,김호수,조병수,차성호,Koo, Gyo-Dang,Ahn, Seok-Hee,Kim, Ho-Soo,Cho, Byoung-Soo,Cha, Sung-Ho 대한소아감염학회 1997 Pediatric Infection and Vaccine Vol.4 No.1
We had experienced a case of pericarditis associated with Mycoplasma and Salmonella co-infection. This 5-year old boy presented with high fever and generalized tonic-clonic seizure. The diagnosis was based on the markedly increased serial titer of Widal test and cold agglutinin with Mycoplasma indirect hemmagglution test during hospitalization. The electrocardiogram revealed P-R interval prolongation and an echocardiogram revealed moderate pericardial effusion. The patient treated with ceftriaxone and erythromycin for 2 weeks, and responded to the treatment well. We report this case with brief review of the related literatures.