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RFID 를 이용한 이동 로봇의 위치 추정을 위한 실내 공간에서의 태그 배치 알고리듬
김현태(Hyun-Tae Kim),지용관(Yong-Kwan Ji),박장현(Jahng-Hyon Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Recently, researches on estimating a mobile robot's position using RFID tags get attention as the RFID cost goes down. In this paper, an optimizing algorithm for arranging RFID tags in indoor environments is proposed in order to improve the position estimation and to reduce the number of the tags. Firstly, the stochastic sensor model of RFID is derived and the design factors including the maximum identifiable distance, the identification direction and the read success rate are obtained. The arrangement algorithm is developed with consideration of those factors for a variety of RFID antenna configurations and different indoor environments. The algorithm is implemented on a mobile robot and improvement in position error is experimentally demonstrated.
임송철,장시영,김현태,이동헌,강계명,Lim Song Chul,Chang Si Young,Kim Hyon Tae,Lee Dong Heon,Kang Kae Myung 한국재료학회 2004 한국재료학회지 Vol.14 No.7
Heat analysis of the plate type and wave type heat sink were carried out by using computational simulation. The heat resistance and air flow of two heat sink models were analysed according to natural and forced convection condition and positions of fan. When a fan was at the position of z-axis and y-axis in forced convection, the heat resistances of plate type heat sink were $0.17^{\circ}C/W$, and $0.28^{\circ}C/W$ respectively. In the case of wave type heat sink, they were $0.18^{\circ}C/W$ and $0.53^{\circ}C/W$. As the air flow velocities were averagely $0.386\;m/s\~3.269\;m/s$, air flow velocity of plate type heat sink was faster than that of wave type. In this experiment, it was observed that the plate type heat sink showed a good ability of heat radiation comparing with wave type one.
전자빔 코팅 및 플라즈마 용사에 의한 안정화지르코니아/CoNiCrAlY 계면의 산화거동
최원섭,김영도,전형탁,김현태,윤국한,홍경태,박종구,박원식,Choi, Won-Seop,Kim, Young-Do,Jeon, Hyeong-Tag,Kim, Hyon-Tae,Yoon, Kook-Han,Hong, Kyung-Tae,Park, Jong-Ku,Park, Won-Sik 한국재료학회 1998 한국재료학회지 Vol.8 No.6
열차폐코팅층의 박리는 세라믹/금속접합층 계면에서 취성이 큰 스피텔의 생성, 금속과 세라믹의 열팽창계수의 차이, 세라믹층의 상변태, 코팅층의 잔류응력에 기인한다. 본 연구에서는 인코넬 713C에 전자빔 코팅 및 플라즈마 용사법으로 코팅된 안정화지르코니아/CoNiCrAIY 계면의 산화거동을 조사하기 위하여 $900^{\circ}C$에서 등온산화시험동안 생성되는 산화막층과 스피넬 생성 거동을 관찰, 분석하였다. 코팅 직후 코팅층에 고르게 분포하고 있는 Co,Ni,Cr,AI,Zr의 원소들이 산화시간에 따라 확산하여 산화반응을 하였다. 초기 20시간의 산화기시간에 안정화지르코니아/CoNiCrAIY 계면에 주요 성분이 $\alpha$-$AI_2O_3$인 산화막층이 생성되었고, CoNiCrAIY층에는 AI의 외부확산으로 인한 AI 결핍지역이 생성되었다. 산화시험동안 $\alpha$-AI2O층이 임계두께까지 성장한 후에 산화막층의 성장속도는 감소하였고, 안정화지르코니아/산화막층 계면에 스피넬, $Cr_2O_3$, $CO_2CrO_4$의 형성으로 인한 크랙이 관찰되었다. The spallation of a thermal barrier coating layer depends on the formation of brittle spinels. thermal expansion mismatch between ceramic and metal. the phase transformation of a ceramic layer and residual stress of coating layer. In this work. the formation mechanism of oxide scale formed by oxidation treatment at 90$0^{\circ}C$ was investigated in order to verify oxidation behavior at the interface between E-beam coated $Zr0_2$-7wt.% $Y_20_3$ and plasma sprayed CoNiCrAIY. Some elements distributed in the bond coating layer were selectively oxidized after oxidation. At the initial time of oxidation. AI-depletion zone and $\alpha$-$Al_O_3$,O, were formed at the bond coating layer by the AI-outward diffusion. After layer grew until critical thickness. spinels. $Cr_20$, and $C0_2CrO_4$ by outward diffusion of Co. Cr, Ni were formed. It was found that the formation of spinels may be related to the spallation of $Zr0_2$-7wt.% $Y_20_3$ during isothermal oxidation.
박성진(Park, Sung-Jin),김현태(Kim, Hyon-Tae) 한국주거환경학회 2010 주거환경(한국주거환경학회논문집) Vol.8 No.1
This study aims to examine actual conditions of image of urban landscapes in Yeosu where the Expo 2012 Yeosu will be held and draw its orientation, and provide basic materials for increasing effectiveness in maintaining and managing urban image in future. As a result of the study, it was found that the factors affecting the landscape satisfaction of old downtown areas examined included stability, sense of scale, naturalness and comfortableness and those of new downtown areas were stability, sense of scale, comfortableness and easiness. Therefore, it was considered that for improving the images of these landscapes, old downtown areas need to relieve gap in the scale between new and old buildings, high-dense buildings, that is, subdivision of regional district and expansion of urban infrastructures including street network and public site, and new downtown areas have the landscape formed by systematic management, but require concerns on encouraging design for upper stories and harmony of high-storied buildings with the surroundings through management of difference in scale between general buildings and high-storied apartment houses and of irregular shapes which are not harmonized with natural environment, color, shape and advertisement of high-storied buildings, and activation of incentive system.
도핑한 텅스텐선에 있어서 도펀트가 미세조직에 미치는 영향
최주,김재수,홍종휘,김현태 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.6
The effect of dopants, Al₂O₃, K₂O and SiO₂ (AKS), on the microstructure of tungsten ingots and wires has been investigated. It was found that rapidly heated ingots showed finer grain size with low degree of sintering than slowly heated ingots. The AKS doped ingot showed the lowest degree of sintering whereas the KS doped ingot showed the highest. Secondary recrystallized grain structure was closely related with bubbles formed in the drawn wire. The AKS wire showed the highest bubble density whereas KS showed the lowest. As density of bubble increased, the secondary recrystallization temperature of the wire also became increased.