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변형률 속도에 따른 Fe-24.5Mn-4Cr-0.45C 합금의 인장 특성과 동적 변형시효
이승용,황병철,Lee, Seung-Yong,Hwang, Byoungchul 한국재료학회 2016 한국재료학회지 Vol.26 No.5
In the present study, the tensile properties and dynamic strain aging of an Fe-24.5Mn-4Cr-0.45C alloy were investigated in terms of strain rate. During tensile testing at room temperature, all the stress-strain curves exhibited serrated plastic flows related to dynamic strain aging, regardless of the strain rate. Serration appeared right after yield stress at lower strain rates, while it was hardly observed at high strain rates. On the other hand, strain-rate sensitivity, indicating a general relationship between flow stress and strain rate at constant strain and temperature, changed from positive to negative as the strain increased. The negative strain-rate sensitivity can be explained by the Portevin Le Chatelier effect, which is associated with dynamic strain aging and is dependent on the strain rate because it is very likely that the dynamic strain aging phenomenon in high-manganese steels is involved in the interaction between moving dislocations and point-defect complexes.
문화 원형으로서 브라질 낙천성의 형성과정과 사회적 투영
이승용 한국 포르투갈-브라질 학회 2014 포르투갈-브라질 연구 Vol.11 No.3
This research goes to handle with the formation and the evolution of Brazilians’ Dionysian character or properties in diachronic view point and to read, synchronically, Brazilian social phenomena through them. Basically Brazil is composed of three distinct races: the African Black, the European White and the Indios. As national characters usually reflect its culture, it is natural to suppose that the Brazilians’ Dionysian properties also result from it, namely Brazilian culture formed since its discovery in 1500. It is argued here that these properties are linked closely to their thinkings: primitive beliefs and Roman Catholicism. The Brazilians’ Dionysian characters, formed and developed along with the formation of Brazil, now have considerable influence on Brazilian way of life. The Dionysian properties in question now allow us to interpret more properly the cultural indexes developed in terms of Hofstede. And finally this study on Brazilian national characters help us to make inroads of cultural goods in Brazilian market.
이승용,최진규 韓國交通大學校 2013 한국교통대학교 논문집 Vol.48 No.-
When a steel bridge is connected, usually friction type joint is used for high strength bolted joints. However, sometimes tension type joint is better than friction type joint. Though, it is partially applied on building structures, and is not possible to apply it on the civil structures, because of design specification absence and lack of research data about high strength bolt tension type joints. On the other hand, the various researches are conducted in the foreign countries to apply high strength bolt on the civil structures, and tension type joints are using for the civil structures based on the researches. Therefore, this study is to suggest basic data for investigation of high strength bolt tension type joint's fundamental mechanical behaviour through the static tensile test about T connection of steel members that focus on the short bolt type of high strength bolt tension type joint. The influences about the bolt diameter differences on the same flange thickness were examined. The plastic deformation is sharply increased through the flange buckling, when bolts procure enough diameter. Also, it was possible to find little weight changes in plastic section due to the bolts diameter differences, but the influences were insufficient. On the other hand, different yield load on bolts through the failure mode was recognized even the same bolts were used when influences on the flanges with different thickness and same diameter of bolts were examined.
Optimization of the Refining Process of Camellia Seed Oil for Edible Purposes
이승용,정문웅,윤석후 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.1
Processing conditions during degumming,alkaline refining, bleaching, and deodorization of crudecamellia seed oil were optimized to obtain high-qualityedible camellia oil. Physicochemical properties of camelliaoil were monitored during refining steps. RBD (refined,bleached, and deodorized) camellia oil obtained usingoptimized refining conditions fully satisfied Korean qualitystandards for edible oil. The iodine value of camellia oilwas 84.2 mg I2/100 g of oil. Camellia oil contained anexceptionally high level of oleic acid (83.1%), along withminor quantities of other fatty acids (8.9% palmitic acid,4.8% linoleic acid). The total saponin content in crude oilwas 437 ppm, as determined by gravimetric analysis. Most(99.8%) of the saponin in crude oil was removed duringthe refining process. The physicochemical properties ofcamellia oil were similar to olive oil. RBD camellia oil isvirtually colorless and bland tasting and is suitable foredible purposes.
이승용 민족어문학회 2020 어문논집 Vol.- No.88
This study had a general consideration on Epitaph among Epitaphs of Leejae(李縡, 1680~1746) and investigated on acceptance of “SangGangCheonPyo(瀧岡阡表)” by Ouyang Xiu(歐陽修) focusing on Epitaph of Father(先考墓誌) and “Epitaph of Mother(先妣墓誌)” highly praised by Lee Gyusang(李奎象, 1727~1799) and literary accomplishment sought by Leejae(李縡) through “Epitaph of Father(先考墓誌)” and “Epitaph of Mother(先妣墓誌)”. In “Epitaph of Father(先考墓誌)” and “Epitaph of Mother(先妣墓誌)”, Leejae(李縡) inherited the tradition of Epitaph that passed down from the former era while actively accepting and utilizing the method of writing poem from “SangGangCheonPyo(瀧岡阡表)” by Ouyang Xiu(歐陽修) and reproduction of words. Furthermore, Leejae(李縡) intentionally changed the uniform description development method to break away from the fixed format of existing Bijiryu(碑誌類) sentences. Leejae(李縡) also made new attempts by inserting dialogue or stories in the middle to bring vitality to Bijiryu(碑誌類) genre which used flat description method. This brought huge changes in Bijiryu(碑誌類) genre where the description method is mainly flat and dry. Considering this, Leejae(李縡)’s Jeonjangryu(傳狀類) and Bijiryu(碑誌類) sentences were highly praised and comparable to Sima Qian and Ouyang Xiu(歐陽修) at that time not just because he left many works. Instead, his sentences were highly praised and comparable to them because Leejae(李縡) made remarkable accomplishments in literary values. Among Epitaphs written during the late Joseon Dynasty Period, numerous works adopted “SangGangCheonPho(瀧岡阡表)” by Ouyang Xiu(歐陽修). On the other hand, “Epitaph of Father(先考墓誌)” and Epitaph of Mother(先妣墓誌) well shows how Epitaphs of the late Joseon Dynasty Period accepted “SangGangCheonPyo(瀧岡阡表)” by Ouyang Xiu(歐陽修) and they clearly show literary accomplishment of Leejae(李縡) among his Epitaphs. 본고는 李縡(1680~1746)의 碑誌文 가운데 墓誌에 대해 개괄적으로 고찰해보고, 그 가운데 李奎象(1727~1799)이 高評한 「先考墓誌」와 「先妣墓誌」를 중심으로 歐陽修의 「瀧岡阡表」의 수용 양상 및 李縡가 「先考墓誌」와 「先妣墓誌」를 통해 추구했던 碑誌類 장르의 변모 양상과 문학적 성취를 규명하였다. 李縡는 「先考墓誌」와 「先妣墓誌」에서 이전시대부터 전해진 碑誌文의 전통을 계승하는 동시에 歐陽修의 「瀧岡阡表」에서 구현되었던 簡嚴한 篇法과 傳言의 再演기법을 수용하여 적극적으로 활용하였다. 뿐만 아니라, 기존 碑誌類 문장의 고정된 형식을 벗어나기 위해 획일적인 서술 전개 방식에 의도적으로 변화를 주었으며, 중간 중간 대화나 일화를 삽입하는 등의 새로운 시도를 하여 무미건조한 서술방식으로 일관된 碑誌類 장르에 생동감을 불어넣었다. 이는 투식적이고 획일적인 서술이 주가 되는 碑誌類 장르에 가져온 큰 변화이다. 이로 볼 때, 당시에 李縡의 傳狀類와 碑誌類 문장이 司馬遷과 歐陽修에 비견될 정도로 높은 평가를 받았던 것은 그가 단순히 많은 작품을 남겨서가 아니라, 작품성과 문학성에 있어서도 주목할 만한 성취를 이루어냈기 때문이다. 조선 후기 碑誌文 가운데 歐陽修의 「瀧岡阡表」를 수용한 다양한 작품들이 존재하지만, 「先考墓誌」와 「先妣墓誌」는 조선 후기 碑誌文에서 歐陽修의 「瀧岡阡表」의 수용 양상을 가장 잘 엿볼 수 있는 작품이자, 李縡의 墓誌文 가운데서 그의 문학적 성취를 뚜렷이 살펴볼 수 있는 작품이라 하겠다.