Kinetics-driven high power Li-ion battery with <i>a</i>-Si/NiSi_<i>x</i> core-shell nanowire anodes

Kang, Kibum,Song, Kyeongse,Heo, Hoseok,Yoo, Sunyoung,Kim, Gil-Sung,Lee, Geunhee,Kang, Yong-Mook,Jo, Moon-Ho Royal Society of Chemistry 2011 Chemical science Vol.2 No.6

<P>We report amorphous-Si nanowire shell anodes, supported by NiSi<SUB><I>x</I></SUB> nanowire cores, by catalyst-free two-step SiH<SUB>4</SUB> chemical vapor deposition, where the metallic core acts as a mechanical supporter and a kinetically unlimited charge supplier. We have achieved highly reversible capacitance of over 3000 mAh g<SUP>−1</SUP> even at a 2C rate, with stable cyclic retention which stems from the altered electrochemical reactions with relatively small volume expansion routes by a kinetic effect.</P> <P>Graphic Abstract</P><P>We demonstrate that kinetics-driven Li-Si electrochemistry at the amorphous-Si nanowire shell anodes, supported by NiSi<SUB>x</SUB> nanowire cores can be utilized for high power Li-ion battery characteristics. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0sc00628a'> </P>

주유소 캐노피 조명에 의한 빛공해 실태조사 및 분석

강호석(Hoseok Kang),김동희(Dong-Hee Kim),유성식(Seongsik Yoo),김훈(Hoon Kim) 한국조명·전기설비학회 2016 한국조명·전기설비학회 학술대회논문집 Vol.2016 No.11

보안 운영체계의 개발 과정 중 보안성 검증방법

강호석(Hoseok Kang),김남창(Namchang Kim),심영철(Youngchul Shim),이진석(Jinseok Lee),장인숙(Insook Jang) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅰ

표준으로 정의된 IT제품의 보안성 평가 방안들은 CC나 ITSEC, TCSEC과 같이 많이 나와있다. 그러나 이러한 표준은 너무 추상적이고 소프트웨어의 각 단계에 따른 보안성을 측정하는데 불충분한다. 또 SSE-CMM같은 프로세스를 평가하는 방법의 경우 역시 너무 추상적이고 포괄적인 연만을 설명하였고 프로세스 자체에 대한 평가에 중점을 두었을 뿐 각 단계의 보안강도를 평가하는데는 부족하다. 이 논문에서는 이러한 단점을 보안하고자 각 공정단계에서, 특히 제품을 계획하는 단계인 요구분석단계와 디자인 단계에서 그래프 모델링과 모듈 다이어그램 통한 검증방법을 제시하였다. 여기서는 보안 운영체계라고 특정 제품을 명시하였지만 실제로 다양한 IT제품에 적용될 수 있다.

Geometrically and Topographically Consistent Map Conflation for Federal and Local Governments

강호석(Hoseok Kang) 대한지리학회 2004 대한지리학회지 Vol.39 No.5

공간데이터자원이 많아 질수록 그들끼리 불일치가 일어날 확률은 높아지고 있다. 이러한 불일치는 같은 지역을 커버하는 같은 종류의 공간데이터사이에서도 일어날 수 있다. 그러므로, 이런 공간데이터를 효율적으로 연결시켜 Geometry 및 Topology측면에서 일관성을 지닌 새로운 공간데이터를 생성시키는 일의 중요성은 증가 할 것이다. 이러한 공간데이터중의 하나로서 미국 인구통계국의 TIGER파일을 예로 들 수 있다. 현재 인구통계국 지도들은 지방정부의 지도 레이어들과 공간적으로 일치 하지 않기 때문에 인구적, 경제적인 많은 유용한 정보가 지방정부의 레이어들과 연계되어 공간적으로 충분히 활용되어지고 있지 않고 있다. 그러므로, 인구통계국 지도의 위치정보는 좀 더 정확한 위치정보를 가지고 있는 지방정부의 레이어들과 융합되어 Geometry 및 Topology측면에서 새로운 정보로 대체되어져야 한다. 이 논문은 참고맵을 이용하여 Geometry 및 Topology측면에서 일관성을 지닌 지도를 만들기 위한 개념적인 프레임과 두가지 맵모델을 제시한다. 첫번째 모델은 셀 모델인데 맵은 0셀, 1셀, 그리고 2셀로 구성되어진다. 두번째 모델은 수학적으로 다른 원형을 가진 물체는 지도 일반화후에도 유사성을 가지고 있다는 것이다. 새롭게 제시돤 계층적인 맵 융합은 물리적, 수학적, 논리적 경계에 바탕을 두고 있고 복잡성과 계산적인 부담을 감소시킬 수 있다. 반복성을 가진 맵 융합 원리는 인구통계지도를 예로하여 형성되었다. 이것들은 속성 매치, 의미있는 노드발견, 지도학적인 0-cell 매치, 지도학적인 1-cell 매치, 그리고 맵 변형으로 구성된다. As spatial data resources become more abundant, the potential for conflict among them increases. Those conflicts can exist between two or many spatial datasets covering the same area and categories. Therefore, it becomes increasingly important to be able to effectively relate these spatial data sources with others then create new spatial datasets with matching geometry and topology. One extensive spatial dataset is US Census Bureau’s TIGER file, which includes census tracts, block groups, and blocks. At present, however, census maps often carry information that conflicts with municipally-maintained detailed spatial information. Therefore, in order to fully utilize census maps and their valuable demographic and economic information, the locational information of the census maps must be reconciled with the more accurate municipally-maintained reference maps and imagery. This paper formulates a conceptual framework and two map models of map conflation to make geometrically and topologically consistent source maps according to the reference maps. The first model is based on the cell model of map in which a map is a cell complex consisting of 0-cells, 1-cells, and 2-cells. The second map model is based on a different set of primitive objects that remain homeomorphic even after map generalization. A new hierarchical based map conflation is also presented to be incorporated with physical, logical, and mathematical boundary and to reduce the complexity and computational load. Map conflation principles with iteration are formulated and census maps are used as a conflation example. They consist of attribute embedding, find meaning node, cartographic 0-cell match, cartographic 1-cell match, and map transformation.

편도 2차로에서 도로조명과 차량 전조등 조명 상충관계에 관한 연구

강호석(Hoseok Kang),유성식(Seongsik Yoo),김훈(Hoon Kim) 한국조명·전기설비학회 2017 한국조명·전기설비학회 학술대회논문집 Vol.2017 No.5

Ablation characteristics of carbon-based thermal protection material for radioisotope thermoelectric generator

Hoseok Kim,Phil-Yong Oh,Bo-Ram Kang,Keun-Young An,Bong Guen Hong 한국진공학회 2018 한국진공학회 학술발표회초록집 Vol.2018 No.2

A Study on the Skin Irritation Toxicity Test of Processed Sulfur in New Zealand White Rabbit

Hoseok Jung,서욱철,Taeseong Jeong,Hyung Won Kang,Sung Chul Kim 대한약침학회 2022 Journal of pharmacopuncture Vol.25 No.1

Objectives: This study was performed to evaluate the skin irritation toxicity of processed sulfur. Methods: All experiments were conducted at Medvill (Korea), an institution authorized to perform non-clinical studies, under the Good Laboratory Practice (GLP) regulations. In order to investigate skin irritation toxicity of processed sulfur, we divided the back of six rabbits into two control sites and two test sites. One of each of the two control and test sites was then designated abraded sites and intact sites. In test sites, 0.5 g of processed sulfur was applied to the back of the rabbit for 24 hours, and in control sites, 0.5 g of sterile distilled water was applied in the same way. We observed and evaluated mortality, weight, general symptoms, and skin irritation toxicity. This study was conducted with the approval of the Animal Ethics Committee (Approval number: IAC2020-1549). Results: In all experiments, no dead animals were observed. In all cases, skin coloration was observed at 24 hours after processed sulfur administration. This coloration lasted up to 48 hours and is believed to be the effect of the administration of test substances. Weight measurement indicated that weight was lost 72 hours after administration in three cases, but this is considered an accidental weight change. Normal weight gain was observed in the remaining subjects. In all animals, no skin irritation toxicity was observed, and the primary irritation index (P.I.I) was calculated as 0.0 according to Draize’s evaluation method. Conclusion: The above findings suggest that it is relatively safe to apply a processed sulfur to the skin. Further research on this topic is needed to provide more specific evidence.

The separation of plastics and rubbers using adhesion properties

( Hoseok Jeon ),( Bat Erdene Davaadorj ),( Su Kang Kim ),( Eun Seon Lee ),( Sang Ho Baek ) 한국폐기물자원순환학회(구 한국폐기물학회) 2013 한국폐기물자원순환학회 심포지움 Vol.2013 No.2

Spectroscopic and Computational Insight into the Intermolecular Interactions between Zwitter-Type Ionic Liquids and Water Molecules

Park, HoSeok,Jung, Young Mee,Yang, Seong Ho,Shin, Weonho,Kang, Jung Ku,Kim, Hoon Sik,Lee, Hyun Joo,Hong, Won Hi WILEY-VCH Verlag 2010 Chemphyschem Vol.11 No.8

<P>Geometric and conformational changes of zwitter-type ionic liquids (ZILs) due to hydrogen-bonding interactions with water molecules are investigated by density functional theory (DFT), two-dimensional IR correlation spectroscopy (2D IR COS), and pulsed-gradient spin-echo NMR (PGSE NMR). Simulation results indicate that molecular structures in the optimized states are strongly influenced by hydrogen bonding of water molecules with the sulfonate group or imidazolium and pyrrolidinium rings of 3-(1-methyl-3-imidazolio)propanesulfonate (1) and 3-(1-methyl-1-pyrrolidinio)propanesulfonate (2), respectively. Concentration-dependent 2D IR COS reveals kinetic conformational changes of the two ZIL–H<SUB>2</SUB>O systems attributable to intermolecular interactions, as well as the interactions of sulfonate groups and imidazolium or pyrrolidinium rings with water molecules. The dramatic changes in the <SUP>1</SUP>H self-diffusion coefficients elucidate the formation of proton-conduction pathways consisting of ZIL networks. In ZIL domains, protons are transferred by a Grotthuss-type mechanism through formation, breaking, and restructuring of bonds between ZILs and H<SUB>2</SUB>O, leading to an energetically favorable state. The simulation and experimental investigations delineated herein provide a perspective to understanding the interactions with water from an academic point of view as well as to designing ILs with desired properties from the viewpoint of applications.</P> <B>Graphic Abstract</B> <P>Formation, breaking, and restructuring of bonds between water and zwitter-type ionic liquids (ZILs) such as 3-(1-methyl-3-imidazolio)propanesulfonate (see picture) are investigated by DFT calculations, 2D IR correlation spectroscopy, and pulsed-gradient spin-echo NMR. It is shown that in ZIL domains, protons are transferred by a Grotthuss-type mechanism. <img src='wiley_img_2010/14394235-2010-11-8-CPHC200900925-content.gif' alt='wiley_img_2010/14394235-2010-11-8-CPHC200900925-content'> </P>

3D 스캐닝 기술을 이용한 탄소복합재 삭마 특성 연구

김호석(Hoseok Kim),강보람(Boram Kang),홍봉근(Bongguen Hong) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12

탄소복합재는 고강도, 초경량, 열적 치수 안전성, 내열, 내약품성 및 우수한 열, 전기 전도도 등의 특성으로 다양한 산업 분야에서 활용되고 있다. 특히 가볍고, 강하며, 고온 환경에 우수한 특성이 필요한 항공분야에서 다양한 부품에 적용하고 있다. 본 연구에서는 탄소복합재 제조 공정을 달리한 3종의 시편을 VKI(von Karman Institute for Fluid Dynamics)의 ICP 플라즈마 풍동(400 kHz, 1.2MW)에서 삭마 시험 후 비접촉식 3D 표면 측정 시스템으로 측정한 3D 스캐닝 데이터를 활용하여 삭마 특성을 연구하였다. Carbon fiber composites are various industries to applications where high strength, ultra light, thermal dimensional stability, heat resistance, chemical resistance and excellent heat and electric conductivity characteristics. Especially, it is applied to various parts in aerospace which needs light, strong, and excellent characteristics in high temperature environment. In this study, three kinds of specimens with different carbon fiber composite manufacturing processes carried out ablation test using the ICP plasma wind tunnel (400 kHz, 1.2 MW) of VKI (von Karman Institute for Fluid Dynamics). Also, studied the characteristics of ablation using 3D scanning data measured by non-contact 3D surface measurement system.