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급냉응고/분말야금법으로 제조된 Al-Fe-V-Si 합금의 기계적 성질 (2) : 파괴기구에 관한 연구 Micromechanism of Fracture
이종철,이두영,이성학,김낙준 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.4
This study is concerned with a correlation between the microstructure and the micromechanism of fracture processes in an RSP/PM Al-8.5Fe-1.3V-1.7Si alloy. The specimens were exposed to the temperatures ranging from 150℃ to 480℃ for 100 hours, followed by room temperature tensile tests, fracture toughness tests and void initiation tests. This RSP/PM Al alloy did not show any significant change in room temperature tensile strength, tensile elongation and fracture toughness even after exposure up to 425℃ for 100 hours. However, tensile elongation and fracture toughness decreased significantly after exposed to 480℃ for 100 hours. Detailed microstructructural analyses showed that the alloy ahs a band structure due to non-uniform distribution of the silicide dispersoids. After exposure to 480℃, the formation of θ-Al₃Fe phases occurs at band structure boundaries by the dissolution of coarse silicide dispersoids, resulting in a loss of ductility and fracture toughness. The micromechanical processes involved in void and microcrack formation were identified and quantified. The results are interpreted using a simplified ductile fracture initiation model based on the basic assumption that crack extention starts to occur at a certain critical strain over a microsturcturally significant critical distance. This model enables us to correlate fracture toughness and microstructure, confirming that the formation of θ-Al₃Fe phases is the main metallurgical factor which contributes to the embrittlement phenomenon after exposure to 480℃ for 100 hours.
국방 기초과학기술 기반 구축을 위한 장기 기초연구 사업의 추진방향
이종철,Lee, Jong-Cheol 한국방위산업진흥회 1991 國防과 技術 Vol.- No.148
날로 심화되어가는 과학기술 선진국의 기술보호주의에 적극 대처하고, 자주국방의 조기달성과 과학기술 능력을 배가하기 위하여 우리는 산.학.연 협동으로 정체상태에 있는 국방과학기술마이드(mind)를 다시한번 되살려야 하겠다. 결국 기초연구의 활성화는 우리 과학기술의 내일을 좌우하게 될 것이다. 이러한 의미에서 볼 때 장기 기초연구사업은 2000년대 고도 정밀무기체계의 자주 연구개발을 위한 범 국가적 장기국방투자사업으로서, 산.학.연 및 군의 적극적인 참여와 관련 과학기술인들의 연구의지가 그 어느때 보다도 절실히 요청되고 있다
이종철,김병규,Lee, Jong-Cheol,Kim, Byeong-Gyu 한국재료학회 1993 한국재료학회지 Vol.3 No.4
PVC/액정 복합막의 응집상태 및 전기광학 특성을 넓은 막조성(30-70wt% LC)에 걸쳐 조사하였다. 또한 optical contrast가 가장 좋은 40/60(PVC/LC)중량조성으로 된 복합막에 대해서는 온도 및 외부교류전계의 주파수 및 전압응답을 측정한 결과 문턱 주파수는 20$V_{p-p}$ 이하(1 kHz, $25^{\circ}C$), rise time및 decay time은 모두 10ms 이하(V$100 _{p-p}$ , 1 kHz, $25^{\circ}C$)였다. The state of aggregation and optical contrast of poly(vinyl chlorich, )(PVC)!nematic liquid crystal(LC) composite film liave been studied for a wide range(30~70 wt% LC)of film composition. In addition. effects of temperature, frequency and voltage of the applied AV electric field on the film transmittance have heen measured for a film containing (6O wt % I, C, which showed maximum optical contrast. For this particular composition of film, tlw thn'shold voltage was smalkr than .40$V_{p-p}$ at I kHZ, $25^{\circ}C$, and the rise time and decay time were smalle, r than l0Oms at 100$V_{p-p}$, I kHz, and $25^{\circ}C$.
벼담수 직파 재배에서 파종 입수가 생육 및 수량에 미치는 영향
이종철,문창식,서해영,최범열,Jong-Chul Lee,Chang-Sik Moon,Hae-Yeong Suh,Beom-Yeol Choi 한국작물학회 1973 한국작물학회지 Vol.- No.14
본 시험은 중부지방에서 담수직파재배에 알맞은 파종립수를 구명함과 파종립수에 EK른 수량 및 수량구성요소의 변이를 알고져 1972년에 수행하였던 바 그 결과를 요약하면 다음과 같다. 1. 최고분얼수는 밀파할수록 직선적으로 증가하여 280립 파종구에서 최고수치를 보였고 그 이후는 점차 감소되었으며 분얼에 대한 경합은 $m_2$당 280립이상 파종구에서 뚜렸했다. 2. 유효경비율은 $m_2$당 120립부터 280립 파종구까지는 파종밀도가 증가될수록 감소되다가 그 이후는 점차 증가되었다. 3. 최고분얼수가 $m_2$당 1,000개 이하에서는 얼자간 경합이 적었다. 4. 수수와 파종립수는 현저한정(+)의 상관이 인정되었고 수수와 일수영화수, 수수와 동숙비율은 (-)의 상관 경향이었다. 5. 수량과 $m_2$당 영화수는 r=0.929이며 수량과 수수는 r=0.695, 수수와 $m_2$당 영화수는 r=0.796이었다. 또한 수량과 수량구성요소간의 순위상관을 보면 수량과 수수가 가장 상관이 높았으며 (r=0.954_ 담수직파에서 수량을 지배하는 요인은 수수이었다. 6. 수량은 $m_2$당 280립 파종구에서 최고를 나타냈다. This study was carried out in the central part of Korea in 1972 to investigate optimum grain number per square meter and variation of the yield and its components in the direct sowing culture on irrigated paddy field. The results could be summarized as follows; 1. Number of maximum tillerings was directly increased with increase of grain number from 120 to 280 per square meter and it was gradually decreased with increase of number sowing grain. So number of maximum tillerings showed at the plot of 280 grain per square meter. Also it was showed remarkable competition at the plot more than 280 grain per square meter. 2. Percentage of effective tiller was decreased with increase of number of sowing grain from 120 to 280 per square meter and after it was gradually decreased with increase of number of sowing grain. 3. It was not remarkable competition in plot less than 1, 000 tillering per square meter on the number of maximum tillerings. 4. It was remarkable positive correlation between the number of panicle and the number of sowing grain, but it was tendency to negative correlation between the number of panicle and the number of spiklets per panicle, and between the number of panicle and the ripening ratio. 5. Correlation coefficient between the yield and the number of spiklet per square meter of land area was 0.929, r=0.695 in the yield and the number of panicle, r=0.796 in the number of panicles and the number of spiklets per square meter Also in rank correlation, it was showed most highly positive correlation(r=0.954) between the yield and the number of panicles, so number of panicles was most largely dominated on yield among the yield components in direct sowing culture on irrigated paddy field. 6. It was producted highest yield in the plot of 280 grain sowing per square meter.
이종철 한국산업경영시스템학회 1981 공업경영논총 Vol.4 No.5
The Marketing strategy is basic to the marketing plan for a firm. It encompasses the art and science of employing the means for achieving established marketing goals. The use of the word "strategy" in reference to the performance of marketing operations has been accepted in general usage during the last twenty years by both business practitioners and educators. It has been borrowed from the military vocabulary where it refers to the art and science of employing the armed strength of a belligerent force to secure the objectives of war. A marketing strategy consists of two distinct and yet interrelated parts: 1. A target market ${\cdots}{\cdots}$a fairly homogeneous group of customers to whom a company wishes to appeal. 2. A marketing mix ${\cdots}{\cdots}$ the controllable variables which the company combines to satisfy this target group.get group.
李鍾喆,崔光泰,金鐃泰,睦成均,朴薰 韓國作物學會 1988 Korean journal of crop science Vol.33 No.S
Ginseng has been used as a medicinal herb in the world for more than two thousand years. Inspection of the quality of ginseng was made since many hundred years ago. Ginseng quality has been graded by several methodes, based on saponin contents, number of ginsenosides, shape of root and tissue elaborateness. In present. ginseng products are usually evaluated by saponin contents and number of ginsenosides. On the other hand, fresh and manufactured ginseng roots such as red. white and semi-red ginseng, Taegeuk Sam, are mostly graded by root shape such as root development and skin (epidermis) color, and tissue elaborateness. which is a conventional grading method. However, the root shape grading method has a risk of overlooking real medicinal properties of ginseng. So. both the medicinal ingredients and the conventional grading method should be considered for the proper evaluation of ginseng quality. Therefore, for the establishment of better method in evaluating ginseng quality, the relationships of root shape and useful components are required to be studied.
엘리엇의 『네 개의 사중주』(Four Quartets)에 있어서의 인식과 표현:불교, 음악과 포스트모던적 글쓰기
이종철 한국T.S.엘리엇학회 2008 T.S. 엘리엇 연구 Vol.18 No.2
T. S. Eliot shows in almost all his poems that he strenuously wrestles with words to express the inexpressible. In his last poem, Four Quartets, he tries to write in an easier and simpler way by using lyric images, visual images and music, all of which just serve as methods to articulate the inarticulate. When Eliot speaks of the lyric, he is concerned not only with measured verse but also with a transmutation of thought and emotion into a communicable medium of language. His usage of lyric imagery is greatly influenced by his study of Dante and Buddhism. In Four Quartets, Eliot finds a way in music to compensate for dispersed and divided meanings of a word. Musical properties that he makes use of are the sense of rhythm and the sense of structure. He tries to write a poem with music of imagery for the secondary meanings of the words. The use of recurrent themes, images and symbols deepens and expands meanings of words. He makes a new whole out of superficially unrelated themes by weaving them together. He develops recurrent themes in Four Quartets through different subject matters such as air, earth, water, and fire. This method is similar to the development of a theme by different groups of instruments in music. The result is very similar to the strategy of Derrida’s writing as the trace. A word is inaccurate and incomplete, but necessary, and so it should remain legible being crossed out instead of being removed. This is why Eliot continues to write again and again, and the ceaseless writing is his text.