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기계적 합금화법에 의해 제조된 Al+Al3Ti합금 및 Al+10wt.%Ti합금의 고용현상
김혜성,이정일,김긍호,금동화,서동수( Hye Sung Kim,Jung Ill Lee,Gyeung Ho Kim,Dong Wha Kum,Dong Soo Shur ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.2
The solubility of Ti in Al matrix was determined by X-ray diffraction method on two different mechanical alloying systems, i.e Al+Al₃Ti and Al+Ti alloys. Starting powder compositions of two systems were chosen for final volume fraction of Al₃Ti phase being 25%. The solubility of Ti in α-Al was estimated by the lattice parameter measurement of Al. For Al+Al₃Ti mixture, it appeared that some of Al₃Ti particles decomposed during milling and maximum solubility of Ti in A1 was about 0.99%. The majority of Al₃Ti particles were dispersed uniformly in Al matrix, having approximate size of 100∼200㎚. On the other hand, higher Ti solubility of 1.24 wt.% was found in Al+Ti system, with starting composition of Al+10 wt.%Ti. After 15 hours of milling, Ti phase was identified as 20㎚ sized particles embedded in Al matrix. The annealing of mechanically alloyed powders from Al+Al₃Ti and Al+10 wt.%Ti systems was followed in the temperature range of 200 to 600℃ to study thermal stability of supersaturated solution of Al(Ti). After annealing, the lattice parameter of A1 reverted back to that of pure Al, and the peak intensity ratio of Al₃Ti/Al was increased more than the original value before annealing. These results suggest that Ti dissolve into alpha-Al solutions during milling, and by annealing, Do_(22)-Al₃Ti phase forms from Al(Ti) solution.
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김혜성,윤성원,Kim, Hye-Seong,Yoon, Sung-Won 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.1
국내에 설치될 강구조 스타디움에 향후 신재생에너지 중 하나인 태양광 발전을 위한 PV 시스템을 적용하는 것에 따른 강재 어레이에 관한 기초 연구로 해외의 사례를 토대로 구성되었다. 연구를 진행하기 위하여 1990년대 이후 PV 시스템이 적용된 강구조 스타디움 20건을 사례 분석 대상으로 선정하였다. 선정된 20건의 강구조 스타디움을 PV 모듈을 고정하기 위하여 설치된 레일 시스템에 따라 분류해 보았다. 그 결과 격자고정방식 중 선형모듈고정방식과 지붕 통합형이 전체의 28%에 해당되는 것으로 조사되었으며 그 뒤로 레일 고정형 17%, 세로 고정방식 중 모듈그룹 고정 11% 순으로 조사되었다. 또한 스타디움 내부에는 주로 격자 고정방식 중 선형모듈 고정방식과 지붕통합형이 적용되고 있었으며 스타디움 외부나 그 외 부분에서는 앵글 브라킷으로 PV 모듈이 고정되고 있는 것으로 조사되었다. This paper focuses on steel arrays regarding the application of PV system for solar power system, a renewable energy in steel structure stadium that will be built in Korea, by foreign case study. 20 cases of Steel Structure Stadiums applying PV system after 1990 were selected as the main subjects. The 20 cases of Steel Structure Stadiums were categorized by rail systems that were installed to fix PV module. As the result, linear clamping and roof-integrated type among cross rails were 28% of the whole, followed by 17% of rail-fixed type and 11% of module group-fixed type among vertical-fixed types. In addition, linear clamping and roof-integrated type among cross rails were applied in the inside of the stadium while the outside and other parts of stadiums used angle bracket to fix PV module.
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가스분사 분말로부터 고온 압출된 Al-Ni-Mm-(Cu, Fe)합금들의 미세구조 및 기계적 성질
김혜성,Kim, Hye-Sung 한국재료학회 2006 한국재료학회지 Vol.16 No.2
The effects of Cu and Fe additions on the thermal stability, microstructure and mechanical properties of $Al_{85}-Ni_{8.5}-Mm_{6.5},\;Al_{84}-Ni_{8.5}-Mm_{6.5}Cu_1,\;Al_{84}-Ni_{8.5}-M_{m6.5}Fe_1$ alloys, manufactured by gas atomization, degassing and hot-extrusion were investigated. Gas atomization, with a wide super-cooled liquid region, allowed the alloy powders to exhibit varying microstructure depending primarily on the powder size and composition. Al hotextruded alloys consisted of homogeneously-distributed fine-grained fcc-Al matrix and intermetallic compounds. A substitution of 1 at.% Al by Cu increased the thermal stability of the amorphous phase and produced alloy microstructure with smaller fcc-Al grains. On the other hand, the same substitution of 1 at.% Al by Fe decreased the stability of the amorphous phase and produced larger fcc-Al grains. The formation of intermetallic compounds such as $Al_3Ni,\;Al_{11}Ce_3\;and\;Al_{11}La_3$ was suppressed by the addition of Cu or Fe. Among the three alloys examined, the highest Vickers hardness and compressive strength were obtained for $Al_{84}-Ni_{8.5}-M_{m6.5}Cu_1$ alloy, and related to the finest fcc-Al grain size attained from increased thermal stability with Cu addition.
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기계적 합금화법으로 제조된 과포정 Al-Ti합금에서 Al3Ti 형성에 관한 연구
김혜성,서동수,김긍호,금동화 ( Hye Sung Kim,Dong Soo Suhr,Gyeung Ho Kim,Dong Wha Kum ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.1
Mechanical alloying is an effective process to finely distribute inert dispersoids in an Al-TM(TM is a transition metal) system. It has been considered that high melting point aluminides are formed by precipitation from supersaturated Al(Ti) powder. This analysis is based on the fact that much higher content of TM than the solubioity can be dissolved in alpha aluminum during the high energy ball milling. Thus, decomposition behavior of Ti in the Al(Ti) was considered very important. But it is confirmed that the higher portion of Ti than Al(Ti) solid solution is existed as nano-sized Ti particles in the MA powders by high energy ball nilling from the XRD spectrum and TEM analysis in this study. Therefore, the role of undissolved TM particles affect the formation of aluminides should be suitably considered. In this study, we present experimental observation on the formation of Al₃Ti fron mechanical alloyed Al-Ti alloys in the hyperperitectic region. This study showed that, in the mechanically alloyed Al-20wt%Ti specimen, intermediate phase of cubic Al₃Ti and tetragonal Al_(24)Ti_8 formed at 300∼400℃ and 400∼500℃, respectively, before the MA state reaches to equilibrium at higher temperatures. The formation behavior of Ll₂-Al₃Ti is interpreted by interdiffusion of A1 and Ti in solid state based on the fact that large amount of nano-sized Ti particles exist in the milled powder. Present analysis indicated undissolved Ti particles of nanosize should have played an important role initiation the formation of Al₃Ti phase during annealing.
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김혜성(Kim Hye-Seong),윤성원(Yoon Sung-Won),박용(Park Yong),김민지(Kim Min-Ji) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
The purpose of this study is classified for constructed point of PV system in stadium though a field of steel structure stadium in foreign as well as analyzing the module joint detail of PV system classified sloping roof and another section. As a result, A number of example of using PV system in roof of steel structure stadium is 5 of 10 and example excepting for stadium is 2. also result of classifying the sloping roof and another section confirmed in 4 example of used to clamping joint detail and 2 of used to Flush-fitted system joint detail. In addition, PV fixed module method is often using a Plate than bolt of T-shape.
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김혜성 ( Hye Sung Kim ) 한국지역언론학연합회 2009 언론과학연구 Vol.9 No.4
본 연구는 광고를 경제적인 수단과 설득의 도구로 보는 기존인식으로부터 새로운 관점에서 주관성(subjectivity)을 바탕으로 한 Q 방법론을 이용하여 대학생의 광고에 대한 인식을 분석하였다. 그 결과, 소비자의 입장에서 제품구매에 필요한 정보와 유행에 대한 정보로 인식하는 정보탐색형, 기업의 입장에서 제품판매와 마케팅을 위한 수단으로 이해하는 소비마케팅형, 그리고 소비자와 기업의 관점이 아닌 수용자의 감성적인 관점에서 유행을 선도하는 수단으로 인식하는 문화예술형 등 세 가지의 유형을 발견하였다. 이어서 세 유형의 차이점과 공통점을 분석한 결과, 광고란 정보뿐만 아니라 흥미를 제공하고, 새로운 유행을 창조하는 `문화현상`의 하나로 이해하고 있다는 점을 세 유형에서 공통적으로 확인할 수 있었다. Q 유형분석에서 밝혀진 문화현상으로서의 광고를 좀 더 심층적으로 파악하기 위해 FGI를 추가로 실시하여 분석한 결과, 광고가 사회의 유행을 선도하는 하나의 문화적 코드로 자리잡아가고 있으며, 특히 인터넷을 이용한 문화적인 광고는 대학생에게 파급효과가 크다는 점을 확인하였다. 본 연구는 그동안 광고를 판매를 위한 설득 수단으로 인식해 왔던 관점으로부터, 문화현상의 하나로 이해해야 하는 인식의 전환을 밝힌 점에 그 의미가 있다. 또한 매체 환경 변화에 따른 대학생의 광고인식에 대해 Q 방법론을 사용하여 유형을 구체화한 점에서도 본 연구의 의미를 찾을 수 있다. This study provides an analysis of college students` understanding of advertising by Q-methodology which is a method based on subjectivity in order to give a new perspective on the existing conception of advertising as a tool of persuasion and a means of economic value. Three (3) types of understanding come out of this analysis: the first group of students who understand the advertising as the information for fashion and purchase ("information-pursuit type"); the second who have the opinion that the advertising works as a tool for the marketing and sales ("consumer-marketing type"); and the third who have a point of view of the advertising as a means of trend leading ("culture-art type"). All of these three present a common perspective on the advertising as a kind of cultural phenomena that creates a new trend in addition to providing entertainment as well as information. The focus group interview is also employed in order to get to a deeper understanding of advertising as a cultural phenomenon that came out of the analysis of types by Q-methodology. The result of FGI analysis confirms that the advertising becomes a cultural code which leads the social trend. It also shows that the internet advertising which contains entertainment contents has a great effect especially among college students. The achievements of this study are to give a new perspective on the advertising by figuring out that the advertising is to be considered not merely as a tool for persuasion and sales but as a cultural phenomenon and to provide a new typology of college students` understanding of advertising under the circumstances of the change of media by Q-methodology.
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