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김헌태(Hun-Tae Kim),김인수(Insoo Kim) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.4
Molybdate chemical conversion coating layer formed on EGI has been studied in view of corrosion resistance, surface morphologies, and phases formed. It was found that coating layer consists of MoO₃, MoO₂, Mo oxides having lower valences than 4 and ZnO. It is interesting to note that the coating layer formed at high Mo concentration (30 g/l) in the temperature range of 40-60℃ exhibited relatively high corrosion resistance, although thickness of coating layer is nearly identical with those formed under the other conditions. It was believed that an increase of driving force due to high Mo concentration plays an important role in the formation of corrosion-resistant coating layer, probably due to the formation of dense coating layer.
3020신재생에너지 정책의 성공적 달성을 위한 전력계통 안정화 핵심기술 개발 방향
김헌태(Hun-Tae Kim),장성수(Seong-Su Jhang) 대한전기학회 2018 전기학회논문지 Vol.67 No.2
Recently, because Korean government"s 3020 renewable energy policy is implemented, renewable energy sources are connected in the power system. The power quality of the Korean power system has been maintained at the highest level in the world, but it will become difficult to maintain the highest level of power quality as the proportion of renewable energy source, which is characterized by severe output fluctuation and difficult control, increases. For those reasons, this paper analyzed Key technologies for stabilization of power system.
무도장 내후성 강교량의 Box Girder 내부볼트 연결부에 대한 외부전원식 전기방식효과에 관한 연구
박용걸(Park Yong-Gul),김헌태(Kim Hun-Tae),백찬호(Baek Chan Ho),최정열(Choi Jung Youl) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper considers corrosion problems in the bolt connection of weathering steel box girder bridge using the external electric type corrosion resistance method which resisted to local corrosion in coated steel surface with contacted air. The weathering steel was created a rust itself in the passive state, but a coated box girder type was easily dew form could be made galvanic cell that accelerated corrosion, so that it was ruled by protection coat with some paint. Therefore, it needed that can be applied the external electric type corrosion resistance method in coated surface. As a result of the test of polarization amount had measured that the weathering steel was higher currents than the general steel by about 5~10%. Therefore, an external electric type corrosion resistance method can be used to protect local corrosion in the coated bolt connection of weathering steel box girders effectively.
김헌태,권상호,지영근,강맹규 한국경영과학회 2003 한국경영과학회지 Vol.28 No.2
The traveling salesman problem (TSP) is an NP-hard problem. As the number of nodes increases, it takes a lot of time find an optimal solution. Instead of considering all arcs, if we select and consider only some arcs more likely to be included in an optimal solution, we can find efficiently an optimal solution. Arc candidate set is a group of some good arcs. For the Lack of study in the asymmetric TSP, it needs to research arc candidate set for the asymmetric TSP systematically. In this paper, we suggest a regression function determining arc candidate set for the asymmetric TSP. We established the function based on 2100 experiments, and we proved the goodness of fit for the model through various 787 problems. The result showed that the optimal solutions obtained from our arc candidate set are equal to the ones of original problems. We expect that this function would be useful to reduce the complexity of TSP.