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결정립 미세화된 Cu-Zn-Al 형상기억합금의 열처리 조건에 따른 변태거동
강조원,장우양,양권승 ( J . W . Kang,W . Y . Jang,G . S . Yang ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.4
A small amount of misch metal and/or Zr was added as a dopant to 70.5wt%Cu-26wt%Zn-3.5wt%Al shape memory alloy in order to study the effect of grain refinement and heat treatments on the transformation behavior, stabilization of martensite, and shape memory ability. It was found that the addition of misch metal and Zr was very effective for reducing the grain size. The fracture mode has been changed from intergranular brittle fracture to ductile fracture with void formation and coalescence by the addition of misch metal and Zr. Aging of the β-phase decreases the M_5 temperature, but that of the martensite phase increases the A_s temperature. The hysteresis of transformation temperature ΔT(A_s-M_s) has an increasing tendancy by grain refinement. The crystal structure of martensite was identified as monoclinic structure. As the grain size decreased, martensite stabilization more easily occured and the shape, memory ability has been reduced by the grain size refined.
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Cu-Al-Ni-Ti-Mn 합금의 변태특성 및 기계적 성질에 미치는 가공열처리의 영향
강조원,장우양,양권승,이영수,곽사호,김춘동,백승남 한국열처리공학회 1999 熱處理工學會誌 Vol.12 No.2
The distribution of the second phase, the change of transformation temperature and mechanical properties with thermomechanical treatment conditions were investigated by metallography, calorimetry, EDS, tensile test and fractography in a Cu-Al-Ni-Ti-Mn alloy. The cast structure revealed Ti-rich precipitates(X_L phase) between dendrite arms, which have been identified as (Cu,Ni)₂TiAl intermetallic compounds. By homogenizing above 900℃, the X_L phase was melted in the matrix, while the X_s phase was precipitated in matrix and the volume fraction of it was increased. When hot-rolled specimen was betatized below 750℃, recrystallization could not be observed. However, the specimen betatized above 800℃ was recrystallized and the grain size was about 50㎛, while X_s phase was precipitated in matrix. With raising betatizing temperature, M_s and A_s temperatures were fallen and transformation hysteresis became larger. The strain of the specimen betatized at 800℃ was 8.2% as maximum value. The maximum shape recovery rate could be obtained in the specimen betatized at 800℃ but it was decreased due to the presence of X_s phase with increasing betatizing temperature.
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表面硬化鋼의 Cas-Carburinzing에 關한 硏究
姜朝遠 조선대학교 생산기술연구소 1978 生産技術硏究 Vol.1978 No.-
表面硬化鋼에 Gas-Carburizing을 행한후 Carbon-Potential에 의한 硬度의 變化와 Carburizing-time에 의한 硬度의 변화 Carburizing-temperature에 의한 硬度 변화를 조사 硏究하였다. 본 實驗으로 부터 얻어진 結果는 다음과 같다. 1) Carbon-Potential이 높은 경우 Carburinzing-layer도 깊고 表面 硬化도 높은 것을 얻었다. 2) Carburizing-time이 길고 Carburizing-temperature가 높은 경우에 우수한 表面 硬度가 얻어졌다. 가장 理想的인 Carburizing-time과 Carburizing-temperature는 930℃×16h 였다. 3) 결국 Gas-Carburizing에 의한 硬度變化는 Carburizing-time과 Carburizing-temperature에 의해 크게 좌우 되었다. In this paper after Gas-Carburizing Several kinds of case Hardening steel by using Gas-Carburizing furnace. The change of the Relation between hardness and carbon-potential, carburizing time, and carburizing temperature was investigated. The important results are as follows. 1) Deep carburizing and High-surface Hardness were formed in the case of High-carbon Potential. 2) Excellent Surface Hardness was obtained in the case of High-carburizing temperature and long carburizing time. The Best ideal carburizing was in case of 930℃ X 16hrs. 3. It is concluded that the change of Hardness by Gas-Carburizing depends on the carburizing time and temperatare.
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중간 및 최종크기의 지로카로이 피복관의 β-quenching에 의한 부식 및 기계적성질의 변화
강조원 조선대학교 생산기술연구소 1987 生産技術硏究 Vol.9 No.1
The mechanical properties and corrosion resistance of zircaloy-2 by using β-quenching in intermediate or final size were investigated. The results obtained in this paper are as follows; 1. β-quenching in intermediate or final size improved the 470 to 500℃ high-pressure steam corrosion resistance of zircaloy-2 cladding tubes. 2. β-quenching treatment prior to the final cold rolling leads to creep strength at 400℃ because of an effect of hardening by precipitation of small second-phase particles formed during β-quenching.
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강조력,방지환,조성일,이영화,오명돈,이종구 대한감염학회 2018 Infection and Chemotherapy Vol.50 No.4
In 2015, rapid human immunodeficiency virus (HIV) testing was implemented in all 25 public health centers in Seoul. During March and December 2015, 20,987 rapid HIV tests were performed, of which 116 (0.5%) were positive. Compared to those of the period before application of the rapid HIV test in place of conventional enzyme immunoassay method, the number of HIV tests performed and the number of positive results increased by sevenfold and twofold, respectively. In conclusion, expansion of the provision of rapid HIV tests in public health centers increased the number of voluntary HIV tests.
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姜朝遠 조선대학교 생산기술연구소 1979 生産技術硏究 Vol.1979 No.-
In the drying of mold and core, the effects of drying temperature, humidity, thickness of mold, permeability, wind velocity, and wind direction on drying rate were investigated. The results obtained in this study were as follows; 1. The drying time of mold and core was decreased with the increase of drying temperature, that is, the drying time of mold and core at 240℃ and 400℃ were 50 minutes, 25 minutes respectively. 2. The effect of temperature in the second and tertiary period of drying(in Fig.2) was very weak. 3. The drying rate was independent of thickness of mold in the first period of drying-(in Fig.2)while in the tertiary period of drying it was inversely proportional to thickness of mold. 4. Drying time(T) of the mold and core coincided with T=Kd^(1·5-1·8). 5. The specimens of low permeability were more effected by drying temperature than those of high permeability were done. 6. The dryng time was decreased with the increase of wind velocity.
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강조미 한일군사문화학회 2010 한일군사문화연구 Vol.10 No.-
「一葉」の文学素養は幼い日の読書と父則義の娘に対する学問への後盾とを肥やしに中島歌子の萩の舎」での和歌と古典によって作られ半井桃水に小説の書き方を習い、幸田露伴と井原西鶴の文学によって自己の世界を打ち開いて行った。又、その文学は貧しい環境のもとでの生活体験の裏付けが見事に綜合されて出来上がったものであるといえよう。「一葉」にとって竜泉寺町での日々はそれまで生きて來た環境とは異なる社会であった。市井の人達の赤裸な姿に接したのである。下層階級の人々を相手にしての商いは「一葉」にとっては最初不安であったが人々と接するたびに現実を見透す力が深まり物事を客観的に見る態度が生じた。又店にくるいろんな個性を持った子供達をみながらたけくらべの構成をねったようだ。商いは失敗に終り、挫折もしたが作家としては大きな収穫があった。そこから「一葉」の代表作が次々と生まれた。たけくらべ大つごもりにごりえ十三夜わかれ道等これらの作品によって「一葉」は一躍文壇にその名を轟かせた。貧しさは「なつ」にとっても「一葉」にとっても宿命のようなものであった。しかしその貧しさゆえに「なつ」は一生「なつ」のままの人生を生きたのではなく、休むことなき努力によって「なつ」から「一葉」となったのである。「一葉」の学歴は小学卒業までであったが帝国大学在学中の文学生達とも対等に接し、自分の無知を恥じながらもその文学生達から多くの影響を受けた。庶民(下級生活者)達の生活を真のあたりにして、それまでのお嬢さん的立場から離れて人間の真実の姿を追求し同じ女の立場から虐げられる女達の悲しみを世に問い階級社会に対しては反骨と批判精神を失わずひたすらその信ずる道を行った努力する女性であった。樋口一葉は浪漫的作品であるたけくらべによってその名を不滅にさせたと言える。たけくらべは竜泉寺町での生活あってこそ生まれた物語である。幕末から明治維新へと時代的転換の中に生を受け幼年時代は恵まれた生活であったが父亡き後、家は没落し、「一葉」は女戸主として母と妹を守る立場に置かれた。経済的には底辺の生活の連続の中で士族の娘としての誇りを忘れず精一杯生きた。やがて「一葉」として人々の羨む存在となったのであるが、その視線を思う存分受けて、楽しむことも許されないまま、その短い生涯を終えたのであった。幕末から維新へと時代転換の中、目覚めた農民(にわか武士)として運命にながされることなく、何ごとにも挫けず、一生懸命生きたその家系からくる強い意志を「一葉」の上にも伺うことが出来ると言えよう。
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