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Improved MCMC Simulation for Low-Dimensional Multi-Modal Distributions
Hyunwoong Ji,Jaewook Lee,Namhyoung Kim 한국경영과학회 2013 Management Science and Financial Engineering Vol.19 No.2
A Markov-chain Monte Carlo sampling algorithm samples a new point around the latest sample due to the Markov property, which prevents it from sampling from multi-modal distributions since the corresponding chain often fails to search entire support of the target distribution. In this paper, to overcome this problem, mode switching scheme is applied to the conventional MCMC algorithms. The algorithm separates the reducible Markov chain into several mutually exclusive classes and use mode switching scheme to increase mixing rate. Simulation results are given to illustrate the algorithm with promising results.
지적 발달장애 아동과 청소년의 치료 및 교육을 돕기 위한 인공지능 소셜 로봇
고현웅(Hyunwoong Go),신원우(Wonwoo Shin),이현주(Hyunju Lee),지승민(Seungmin Ji),유철중(CheolJung Yoo) 한국정보기술학회 2019 Proceedings of KIIT Conference Vol.2019 No.6
지적 발달장애 아동 및 청소년은 전문적인 기관에서 체계적으로 치료 및 교육을 받을 필요가 있다. 하지만 전국에 치료시설의 수는 현저히 적으며, 입소하기 위한 대기기간도 다소 긴 편이다. 또한 대부분의 부모들은 치료시설을 믿지 못하여 직접 치료 및 교육을 진행하고 있지만 가정에서 이들을 치료 및 교육하는 것에 대해 많은 어려움을 겪고 있다. 이러한 문제점을 해결하기 위해 본 논문에서는 가정에서도 부모가 손쉽게 아이들의 교육 및 치료할 수 있게 도와주는 로봇 매개치료 도구로서의 인공지능 소셜 로봇을 직접 제안하고 개발한다. Children with intellectual development disabilities need to be systematically treated and educated in professional facilities. However, the number of treatment facilities across the country is too small, and the waiting period for hospitalization is rather long. In addition, most parents doesn"t believe in treatment facilities and they have a hard time working with and educating them at home. In order to solve this problem, we propose and develop an artificial intelligence social robot as the robot assited therapy tool that helps parents easily educate and treat children with intellectual development disabilities at home.
레이저 식각 및 그리드 전극을 적용한 염료감응형 태양전지의 효율 향상 연구
徐鉉雄(Hyunwoong Seo),孫珉圭(Min-Kyu Son),李庚俊(Kyoung-Jun Lee),金廷訓(Jeonghoon Kim),洪知兌(Ji-Tae Hong),金熙濟(Hee-Je Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.10
Dye-sensitized solar cell (DSC) based on some advantages such as transparency, cheap materials and anti-sensibility for an anlge of incidence has been expected to capture most of solar cell market in the near future. To practical use of DSC, researches on high efficiency as well as upscaling are necessary. In this study, we tried to insert the grid electrode in DSC and scribe transparent conducting oxide (TCO) using Nd:YAG laser. The grid electrode makes the electron movement improved and diffusional movement minimized. Consequently, the efficiency of DSC was increased by reducing electron loss and the surface resistance of TCO. The grid electrode was made using Ag target by radio frequency sputtering. And the scribed surface was confirmed by taking a scanning electron microscopy photos. As the result, grid cell had improved photocurrent and fill factor as compared with the conventional cell. And the efficiency was increased about I % by enhanced photocurrent and fill factor.
Na, Hyunwoong,Choi, Hanshin,Oh, Ji-Won,Jung, Ye Seul,Cho, Yong Soo American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.28
<P>There have been extensive efforts to develop competitive electrocatalysts using carbon black (CB) supports for high-performance proton-exchange membrane fuel cells with less usage of Pt. Herein, we propose a very promising electrocatalyst architecture based on the three-dimensional Pt/indium tin oxide (ITO)/CB support structure which was enabled by a nonconventional deposition process ensuring very uniform impregnation of Pt and ITO nanoparticles into the CB network. The unusual scales of the Pt (∼1.9 nm) and ITO (∼5.6 nm) nanoparticles were directly related to unexpectedly better performance of the electrocatalytic activities. As a highlight, the electrochemical surface area of the electrocatalyst was maintained very well after the 3000 cycle-accelerated durability evaluation by demonstrating an excellent retention of ∼74.9%. Particularly, the CO tolerance exhibited a low value of ∼0.68 V as the absorption current peak, compared to ∼0.79 V for a commercial Pt/CB catalyst containing twice more Pt.</P> [FIG OMISSION]</BR>
Excessive dietary lead reduces growth performance and increases lead accumulation in pigs
Choi, Hyunjun,Ji, Sang Yun,Jo, Hyunwoong,Song, Minho,Kim, Beob Gyun Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.1
Objective: The objective of this study was to investigate the influence of dietary lead (Pb) supplementation and feeding period on growth performance, organ weight, and Pb accumulation in pigs. Methods: In a 56-day feeding experiment, a total of 48 barrows with initial body weight 10.4±0.6 kg were allotted to 2 dietary treatments (0 and 200 mg/kg of supplemental Pb) in a completely randomized design with 6 replicates. Body weight and feed intake were recorded to calculate growth performance. At the end of each 14 day-period (on days 14, 28, 42, and 56), an animal was randomly selected from each pen and slaughtered to collect blood samples, hair samples, left 5th rib, heart, liver, kidneys, lungs, and longissimus dorsi muscle samples. Results: Average daily gain and average daily feed intake were reduced (p<0.05) by supplemental Pb during the day 42 to 56. Relative kidney weight to body weight was linearly increased with increasing feeding period in pigs fed the Pb-supplemented diet, but not in pigs fed the control diet (p<0.05). The Pb concentrations in hair, left 5th rib, kidneys, and lungs were linearly increased with longer feeding period in pigs fed the Pb-supplemented diet, but not in pigs fed the control diet (p<0.01). Conclusion: Dietary Pb supplementation caused growth retardation and Pb accumulation in most organs, particularly in hair, bone, and kidneys in a time-dependent manner.
적층식 제조(Additive manufacturing) 기술동향
오지원,나현웅,최한신,Oh, Ji-Won,Na, Hyunwoong,Choi, Hanshin 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.6
A three-dimensional physical part can be fabricated from a three-dimensional digital model in a layer-wise manner via additive manufacturing (AM) technology, which is different from the conventional subtractive manufacturing technology. Numerous studies have been conducted to take advantage of the AM opportunities to penetrate bespoke custom product markets, functional engineering part markets, volatile low-volume markets, and spare part markets. Nevertheless, materials issues, machines issues, product issues, and qualification/certification issues still prevent the AM technology from being extensively adopted in industries. The present study briefly reviews the standard classification, technological structures, industrial applications, technological advances, and qualification/certification activities of the AM technology. The economics, productivity, quality, and reliability of the AM technology should be further improved to pass through the technology adoption lifecycle of innovation technology. The AM technology is continuously evolving through the introduction of PM materials, hybridization of AM and conventional manufacturing technologies, adoption of process diagnostics and control systems, and enhanced standardization of the whole lifecycle qualification and certification methodology.
상대전극 제작 방식에 따른 염료감응형 태양전지 특성 비교 연구
손민규(Min-Kyu Son),서현웅(Hyunwoong Seo),신인영(In-Young Shin),김진경(Jin-Kyoung Kim),홍지태(Ji-Tae Hong),채원용(Won-Yong Chae),김희제(Hee-Je Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Dye-sensitized solar cell (DSC) consists of photo electrode, counter electrode and electrolyte. Photo electrode has titanium oxide layer with dye molecule to create electrons. And counter electrode is made of one layer that has catalytic ability for redox system such as the iodide/triiodide couple. Most DSC researchers use platinum as catalyst on counter electrode because platinum has good catalytic ability and conductivity. Platinum is doped on fluorine-doped tin oxide glass with different methods such as sputtering method, electrochemical method and so on. In this paper, we deposit platinum on counter electrode glass with two methods. One is the radio frequency (RF) sputtering method and the other is the chemical method with heating treatment. Finally, we compare the photovoltaic characteristics of DSCs that are assembled using two different counter electrodes.