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Development of a Humanoid Walking Command System Using a Wireless Haptic Controller
Taegyu Kim,Eunsu Kim,Jong-Wook Kim 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, a wireless haptic controller is newly implemented, which dictates a humanoid robot to move according to user’ commands. The controller is equipped with a TFT-LCD for showing camera images, a joy stick for changing walking direction and speed, function buttons for stopping and starting walking, and a haptic actuator for delivering the current walking status. This paper provides the simulation of variable-speed walking and its hardware implementation with a humanoid kit. The proposed walking command system is to be applied to the remote medical robot, the exploration robot, the home security robot, and so on.
Strength Reduction of Concrete Subjected to High Temperatures: Effects of Various Aggregates
Wonchang Kim(Wonchang Kim),Keesin Jeong(Keesin Jeong),Hyeonggil Choi(Hyeonggil Choi),Taegyu Lee(Taegyu Lee) 한국화재소방학회 2023 International Journal of Fire Science and Engineer Vol.37 No.1
Previous studies on the strength degradation of concrete subjected to high temperatures were analyzed. To analyze the effect of the coarse-aggregate type on strength degradation, data from previous studies were collected, and the coarse aggregate used, physical properties of the aggregate, and heating conditions were analyzed. The concrete types were classified into normal, heavyweight, and lightweight concrete. Their high-temperature characteristics were analyzed and evaluated according to the mixed coarse aggregate. Finally, the correlations derived from the analysis results were compared with the CEB Code. The analysis results were different for different concrete and coarse-aggregate types, and different tendencies from the CEB Code were observed.
김진철(Jincheol Kim),김성욱(Sung Uk Kim),김동민(Dong Min Kim),김태규(Taegyu Kim) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.5
본 논문에서는 연료전지의 성능향상 및 신뢰성 확보를 위한 연료전지 최적화 및 탑재화 연구를 수행하였다. 고분자 전해질막 연료전지의 성능 향상을 위한 실험은 연료전지에 부하를 걸어 발생되는 전류와 전압을 측정하여, 상용 연료전지 데이터와 비교 분석하였다. 이를 바탕으로 무인항공기 연료전지 탑재상태에서의 최적화를 위한 제어기를 제작하고, 제어 알고리즘 구성을 통해 연료전지를 탑재한 무인항공기의 최적의 성능유지를 위한 연구를 수행하였다. The optimization and integration of a fuel cell were performed to improve the performance and reliability of the fuel cell in this paper. To improve the performance of the PEMFC, current and voltage of the fuel cell were measured using an electrical load, and the results was compared and analyzed with the data of a commercial fuel cell. Based on the above results, a controller for a fuel cell UAV applications was designed, and the fuel cell control algorithm was developed to optimize the performance of the fuel cell UAV.
Design, fabrication and testing of a catalytic microreactor for hydrogen production
Kim, Taegyu,Kwon, Sejin IOP 2006 JOURNAL OF MICROMECHANICS AND MICROENGINEERING - Vol.16 No.9
<P>A catalytic microreactor for hydrogen production was fabricated by anisotropic wet etching of photosensitive glass, which enables it to be a structure with high tight tolerance and high aspect ratio. As a reactor structure, a microchannel was used for improving heat and mass transfer in the reactor. The primary fuel source is methanol for a mobile device. Endothermic catalytic steam reforming of methanol was chosen for producing gaseous hydrogen. The Cu-based catalyst, Cu/ZnO, was prepared by the co-precipitation method and coated on the surface of the microchannel for methanol steam reforming. An overall microfabrication process was established for a MEMS-based catalytic microreactor. The fabricated reactor has a volume of 1.8 cm<SUP>3</SUP> including the volume of the reaction chamber 0.3 cm<SUP>3</SUP> and produced dry reformate with high hydrogen content, 73%. The hydrogen flow was 4.16 ml min<SUP>−1</SUP>, which can generate a power output of 350 mW<I><SUB>e</SUB></I> for a fuel cell.</P><P>The page numbers of this article were corrected on 24 July 2006. The corrected electronic version is identical to the print version.</P>
Kim, Taegyu,Han, Sung-Hyeon,Oh, Hyun-Ung IEEE 2017 Journal of microelectromechanical systems Vol.26 No.1
<P>A novel concept of a variable emissivity radiator was proposed and fabricated using micro electro mechanical system (MEMS) technologies. The emissivity of the radiator can be varied by moving beads electrified along the direction of an electric field. A continuous power supply is not required to sustain the desired state of the radiator to maintain a high or low emissivity state once the beads are electrified by applying a pulse voltage signal. The operational function and the thermal control performance of the fabricated radiator were investigated through experimental approaches. In addition, the theoretical maximum effective emissivity was predicted using a simple numerical model and was compared with the actual value experimentally measured by the thermal test. The temperature difference on the radiator based on the position of the electrified beads, which corresponds to the open and close modes of the radiator, was measured under vacuum condition. The feasibility of the proposed MEMS-based variable emissivity radiator was successfully demonstrated, and its effectiveness in terms of thermal control performance was evaluated through the experimental and numerical approaches.</P>
Kim, Taegyu,Park, Daeil American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.2
<P>This paper describes the La0.8Sr0.2NiO3 perovskite-type catalysts supported on alpha-Al2O3 that were prepared by polyol method and used as a catalyst for the carbon dioxide reforming of methane. The effect of the molar concentration of polyvinyl-pyrrolidone (PVP) on the reducibility, structural properties and carbon deposition was characterized by XRD, and TGA. The carbon dioxide reforming of methane on the catalyst was performed at the different concentration of PVP. At the 1 M PVP, main characteristic peaks of perovskite structure were established without impurities, thus showing the highest catalytic activity; 87.7% and 92.1% in CH4 and CO2 conversion, respectively. After the reaction, carbon deposition was 0.4-0.6%, while 6.2% on the existing Ni catalyst, indicating the perovskite-type catalyst has a superior characteristic preventing it from the carbon deposition at the carbon dioxide reforming of methane.</P>
Kim, Gyuyong,Kim, Youngsun,Lee, Taegyu Architectural Institute of Japan 2010 JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEE Vol.9 No.2
<P>The deformation of building frameworks can lead to critical disasters such as building collapse. Loads, thermal expansion and creep are generally known factors, which cause deformation. High temperature due to fire can also be one of the major factors since concrete deterioration can affect the performance of building structures and eventually can weaken the frameworks. It is, however, difficult to estimate the influence of fire on concrete structures and evaluate the performance of fire resistance design. Many researchers have carried out experiments using small-scale specimens to tackle this issue and it was shown that specimens can reflect the real behavior of structures reasonably well. Nonetheless, it is challenging to achieve uniform temperature rise throughout the specimens while heating the structure as concrete has low thermal conductivity. Many different heating methods were used in recent studies to overcome this problem; however, one cannot compare the results directly to other results due to the variation of the experiment conditions. In this study, therefore, a new heating and loading method was suggested which combines the existing heating systems. Several experiments were carried out to show that a new method can maintain uniform temperature while heating so that the experiment can produce more accurate data.</P>