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.

스테로이드에 인한 무혈성 골괴사와 출혈에 관한 실험적 연구

이종철 최신의학사 1987 最新醫學 Vol.30 No.8

오이재배와 병충해 방제

이종철 충남대학교 농과대학 1997 논문집 Vol.- No.3

인삼 식물체의 부위별 호흡량

李鐘喆,李鐘律,朴薰 韓國作物學會 1985 한국작물학회지 Vol.30 No.2

본 시험은 6월 14 일에 4년생 인삼 식물체의 각 기관별, 10월 1 일에 6년생을 근상태별로 구분하여 호흡량을 측정하였던 바 그 결과는 다음과 같다. 1. 기관별 호흡량은 유과≒엽>화경>경≒근의 순이었다. 2. 15℃ ~30℃ 사이에서의 기관별 호흡계수는 유과 2.39, 엽 1.75, 근 1.57, 경 1.17, 화경 1.16이었다. 3. 채굴 당시 대편삼(117± 8.8g)과 소편삼(54± 4.0g)간에 호흡량의 차이는 인정되지 않았다. 4. 근내 수분함량이 감소할수록 호흡량은 저하되었으며 그 정도는 소편삼에서 현저하였다. 5 . 건전삼에 비해 근적변삼에서 근호흡량이 현저히 많았다. This study was conducted to know the respiration rate in different organ of 4 years old ginseng plant on June 14 and in different root conditions of 6 years old on October 1. Respiration rate of each organ was the increasing order of young berry, leaf, peduncle, stem and root at all temperature(15~circC to 30~circC ). Temperature coefficients of respiration rate from 15~circC to 30~circC of each organ were 2.39 in young berry, 1.75 in leaf, 1.57 in root, 1.17 in stem and 1.16 in peduncle. There was no difference between respiration rate of large size root (117~pm 8.8g) and that of small size (54~pm 4.0g) in 6 years old ginseng. Respiration rate was decreased with the decrease in the water content in root, especially in small size root. And respiration rate of red skin root was higher than that of healthy root.

松菊里型 住居址에 대한 硏究

李宗哲 호남고고학회 2000 湖南考古學報 Vol.12 No.-

松菊里型 住居는 구조적으로 타원형구덩이를 가지고 있고 그 안쪽이나 바깥쪽에 중심기둥을 세워 도리를 받으며 맞배형태의 지붕모양을 하는 청동기시대 주거 유형 중의 하나라고 볼 수 있다. 住居類型의 分類는 타원형구덩이와 中心柱孔의 배치청태에 따라 4가지 유형으로 나뉘며, 4柱의유무에 따라 총 8가지 형태로 세분된다 이러한 8가지 주거지 유형 중에 A①형은 송국리형 주거에서 보편적인 양상을 띠고 있으며, 중서부 평야지역 ·금강유역 ·영산강유역에서 가장 높은 빈도를 보이고 있어 중 ·서남부지역의 공통된 주거지 유형으로 갈 수 있다. 이에 비해 C①형은 낙동강유역권에서 특징적으로 나타나고 있어 지역인 차이를 보이고 있다. 松菊里型 住居유적의 전체적인 분포양상은 넓은 의미에서 수계를 중심으로 밀집되는 모습을 보여주고 있다. 이러한 수계를 중심으로 분포권을 설정하면 5개의 地域圈으로 구분할 수 있다. 즉 중서부 평야지역권, 금강 유역권, 영산강 유역권, 보성강 유역권, 낙동강 유역권이며 낙동강 유역권은 다시 황강유역과 남강유역, 그리고 기타 지역으로 세분된다. 송국리형 주거의 편년은 출토유물의 빈약함으로 말미암아 많은 어려움이 따르고 있으나 방사성탄소연대의 축적이 여러 유적에서 이루어지고 있다. 이를 기초로 연대를 추정할 경우, 금강유역에서는 적어도 기원전 8세기까지 올려볼 수 있으며, 중서부 평야지역권은 이보다 어느정도 상회할 것으로 추정된다. 또한 송국리형 주거의 C^l4연대는 남부지역으로 갈수록 내려가는 경향을 보이고있다. 지역적으로 많은 유적에서 C^l4연대 자료가 축적되어야 보다 분명한 양상을 알 수 있겠지만, 남한지역에서 송국리형 주거지는 기원전 6~S세기를 전후하여 가장 성행하였던 것으로 판단된다. The Songgungni-type dwelling has an oval hollow structure and is one of the residential types in the Bronze Age, in which beams are supported by setting the central post at the inside and/or outside of an hollow and the shape of roof is of facing together form. Judging from the aspect of artifacts, it is very likely that the oval pit is similar to a storage depression. In some regions, the production of stone tools were carried out based on it. Moreover, it is estimated that it played a role as a fireplace for storing kindling charcoal. The residential pattern is divided into four types according to the oval hollow and arrangement form of the central pillar, and subdivided into eight sub-types in terms of the existence of four pillars; A①), A②, B①, B②, C①, C②, D①, D②. The distribution of the Songgungni-type dwelling is divided into five areas. In the midwest plain region Type A① is adopted overwhelmingly. A residential pattern showing the square plane form is found and also demonstrates earlier aspects in piled relation to circular residential districts In Kum river region all eight residential types appear and form the most varied residential culture. Type A① takes up most of them and shows an aspect in which Type A② decreases relatively compared to the midwest plain region. The distance between central pillars reveals the regular aspect as opposed to the midwest plain region, and is also verified as extending aspect somewhat in some areas. An oval hollow shows the feature as a storage pit and some tend to be fireplaces. In Youngsan river district Type A① takes up the area for the most part, and only D① is partly found so that it shows most simple residential pattern. In this place the oval depression also displays the feature of the storage pit but it is verified that there tends to be fireplaces in some areas. Type A forms the mainstream but it shows that Type D is increasing in relation in Boseong river district. The distance between central pillars takes on a dispersing aspect without a set pattern. The oval hollow shows the feature of the storage pit. However, vestiges of acts related to stone-tool production are verified at the circumference of the hollow in numerous area so that it manifests similar aspects in comparison with the Nam river basin. The Hwang river district among the Nakdong river basin maintains the distance between the same central pillars in Type A① and is constructed with Type C① because of the influence of the Kum river basin district. As Type C① of this region is spreading gradually, central pillars form regular distance distribution. In the Nam river basin Type A① is decreasing relatively, on the other hand, Type C① is being built intensively, and also Type D② is adopted in the lower part of the Nakdong river.

장승의 문화적 의미와 상징

이종철 한국역사민속학회 1992 역사민속학 Vol.1992 No.2

만엽집가(萬葉集歌)의 연체격(連體格)「 진(津), 도(都)」 와 향가(鄕歌)의 속격(屬格)「 질(叱)」 의 기능에 대하여 : 특히 통사론적 입장에서

이종철 한국일어일문학회 1988 日語日文學硏究 Vol.13 No.1

초고압 가스차단기 내부의 압축성 유동장 해석 ( Analysis of Compressible Flow Fields in a High Voltage Gas Circuit Breaker )

이종철,오일성,김윤제 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.1 No.5

간경변증에 동반된 난치성 복수에 대한 다량 복수천자술(LVP)의 치료 경험

이종철,기춘석,박경남,박병권,전재범,함준수,이민호 대한소화기학회 1992 대한소화기학회지 Vol.24 No.6

In seven cirrhotic patients with tense ascites who had been refractory to ordinary diuretics therapy, we performed LVPs eleven times. LVPs eliminated ascites almost completely without no significant changes in serum sodium, BUN, creatinine, hematocrit, postural systolic blood pressure and pulse rate difference. During and after LVPs, no serious complication occnrred regardless of the presence of peripheral edema.

복강경으로 진단된 복막 위점액종 1예

이종철,이석호,이규택,김재준,이종균,고광철,이풍렬,최규완,이준혁,오영륜,박근칠 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.3

Pseudomyxoma peritonei is a benign mucin producing tumor of the peritoneum which is usually diagnosed using a laparotomy. It is uncommon to find a case of pseudomyxoma peritonei which has been diagnosed using a peritoneoscopy in Korea; there are only two cases reported in the literature. We recently experienced a case of pseudomyxoma peritonei in a 61 year old woman who manifested a typical case using a peritoneoscopy. Thick, jelly-like materials were adherent to polypoid nodular masses of the parietal peritoneum, which originated from the mucinous cystadenocarcinoma of an ovary. In this report we discuss the case with relevant review of the literature.