Effect of Impact Velocity on Interface Characteristics of HT‑9 Steel Joints Fabricated by Magnetic Pulse Welding

Jun‑Woo Song,Jin‑Ju Park,Gyoung‑Ja Lee,Min‑Ku Lee,Kyu‑Hyun Park,Soon‑Jik Hong,Jung Gu Lee 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3

The weldability window in magnetic pulse welding (MPW) is proposed for the end-closure joining of HT-9 steel tubularworkpieces. Based on both theoretical and experimental investigations, the impact velocity of the flyer tube at the momentof collision had a dominant effect on the bonding characteristics of the resultant joints and the optimal impact velocity wasestimated to be in the range of 265–290 m/s in this alloy system. Under the optimal process conditions, no leak was detectedduring helium leak testing. Moreover, the integrity of the joint interface was preserved until the tube section ruptured duringinternal pressure burst testing. For HT-9 steel, the ductile δ-ferrite phase produced by the localized interfacial melting duringMPW acted as an effective obstacle to crack propagation, thereby enhancing the fracture resistance of the joint interface. Allof the results demonstrated the high integrity and durability of the HT-9 steel tube assembly fabricated by the MPW process.

매크로/마이크로 레벨 볼트 결합 구조물에서의 실험적/해석적 방법을 통한 시스템 특성 비교

김봉석,이성민,이문구,이수훈,Jun Ni,송준엽,이창우,하태호 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

As the micro technology and miniaturization of a structure and component in the last couple of decades have been concretely realized, the understanding of structural and dynamic characteristics and prediction of dynamic behavior are indispensable to the miniaturized structures and micro machines. This paper shows the effect of dynamic characteristics in bolt-jointed structures by comparing natural frequencies and mode shapes between macro and micro-scale beams through experimental modal analysis and finite element analysis with a1 8 test models by materials, by size, and by joining condition; that is, SS41 and A16061-T651, micro and macro, and monolithic beam and bolt-jointed beam.

脇痛의 鍼灸治療穴에 對한 文獻的 考察

朴基榮,李浚龜,金永一,朴泰均,辛泳一,黃載然,李賢,李秉烈 대전대학교 한의학연구소 2002 한의학연구소 논문집 Vol.10 No.2

As mentioned above, I have acquired some valuable results about medical treatment with acupuncture and Moxibustion of " Flank pain" after studying oriental medical books . The results Were like below: 1. Medical treatment with acupunctures of Flank pain belonged to the Urinary Bladder Meridian of Foot Taiyang, the Liver Meridian of Foot Jueyin, the Gall Bladder Meridian of Foot Shaoyang. 2. Medical treatmcnt with acupunctures of Flank pain used to Yang-laung-chan(陽陵泉), Gi-gu(支溝), Gi-mun(期門), Kan-su(肝兪) in turn. 3. Medical treatment with Ear acupunctures of Flank pain used to Dam(膽), Sin-Mun(神門), Gan(肝)in turn 4. Acupuncture point of Flank pain were lowrer limb part. chest and abdominal part, back part in turn. 5. Medical treatment with Moxibustion of Flank pain was the most Jang-mun(章門)

朝鮮朝 開化期의 新·舊敎育의 葛藤과 變容에 關한 硏究

李俊球 弘益大學校 1988 弘大論叢 Vol.20 No.1

This article is concerned with what educational heritage the educational innovation of later Yi Dynasty, the prime achiever of the national enlightenment, received from our ancestors, and with how the new education was established and developed on the traditional background of ideology. There were serious conflict and confrontation between the conservatives who stuck to the dualistic pholosophy based on Confucianism and the liberals who advocated educational innovation. Such conflict and confrontation nearly made the Korean education too invalid to struggle against the over-whelmingly surging "European Shock." However, fortunately, our educational leaders had wisdom to take advantage of this crisis to solidify our national conciousness. Therefore, it con be asserted that the new education was started on the dual basis of modernization and national identity. Further, this new education movement took its root as national educational pholosophy even under the Japanese rule, eventually leading to a prime factor of the March lst Independence Movement.

韓國近代의 思想과 敎育 : 民族意識의 屈折과展開 Refraction and Development of National Consciousness

李俊球 弘益大學校 敎育硏究所 1989 敎育硏究論叢 Vol.- No.5

This paper is to examine how the national consciousness of Korea was formed in modern times, when the country went through many changes in thought and education. 1. The national consciousness in modern Korea was formed when domestic and foreign developments enabled the people to see their realities, engaged them in campaigns against foreign invasions and against feudalism, and caused changes in education. 2. This paper discusses how those campaigns happened in that period, what influences the campaigns had on education of the period, and what course the education of the period took in its modernization. 3. As modern Korea could not put an end to the feudal system and stepped on the new historical stage, the country directed its effort exclusively to keeping it independent ant to restoring its full sovereignty while it was struggling against. feudalism and agaist invasion. 4. The course was full of complications, and the situation continued until the Samil Independence Movement of 1919 from 1860's. 5. During that period bringing up leaders was the most important task imposed upon education. In conclusion, education in the latter part of the 19th century was burdened with two tasks at a time: inspiring the people with the national consciousness, and coping with various influences from abroad.

유색미에 관한 연구 : Ⅰ. 감마선 처리에 의해 유래된 Dohoku 유색미 돌연변이체의 주요 특성 Ⅰ. Characteristics of Dohoku color rice mutants derived by Gamma-ray Mutagenesis

이희봉,최현구,김동욱,김준표,정재영,정종태 충남대학교 농업과학연구소 2002 농업과학연구 Vol.29 No.2

1. 돌연변이체 DM-1과 DM-2의 간장은 양친인 Dohoku나 대구조인 흑진주벼보다 짧은 반면에 출수기는 7일내지 20일가량 늦어졌다. 2. 이들 DM-1과 DM-2의 수장은 대조구와 비슷하였으나 주당 이삭수는 대조구와 같이 DM-2에서 매우 많았다. 3. 선발된 계통들에 대한 주당 영화수는 대조구보다 적었으나 영색은 갈색내지 짙은 자주색으로 다양한 변이를 보였고 까락길이 역시 변이가 컸다. 4. 안토치안 색소에 대한 공시계통간 차이를 optical density(OD_(530))값으로 나타낸 결과 DM-2 변이계통에서 2.23, DM-3 변이계통에서 2.26으로 나타나 대조구인 흑진주벼의 2.59보다 크게 낮았다. Culm length of Dohoku mutant 1(DM 1) and mutant 2(DM 2) were shorter than Dohuko parent and Heukjinjubyo check, while days to heading were delayed seven to 20 days Panicle length of these were similar to check and number of panicle per plant of DM 2 was highly appeared than check. Spikelets per plant of the selected lines were lower than check, and glume color of these were varied from brown to dark purple and awn length was also varied according to line used. Anthocyanin content of each mutant line as measured by 530㎚ were lower than that of check in that OD 2.23 and OD 2.26 for DM 1 and DM 2, respectively, and 2.59 for check.

日本「開放大學」에 關한 調査硏究 : The university of Tsukuba 「Open University」System

李俊球 弘益大學校 1982 弘大論叢 Vol.14 No.1

The founding philosophy of the University of Tsukuba is in many respects that of an 「open University」 both in national terms and in international terms. Existing Universities are often confined in Marrow specialty arers, inviting the stagnation and hardening of both research and technology and encouraging isolation from real Society, The University of Tsukuba. with this problem in mind, maintains a constant relationship with changing modern Society, and a flourishing international character, while developing more over, a new organization for he functions and administration of research and teaching on a basis of diversity and flexibility. The objectives of the University are therefor, in respect of the pure and applied sciencs, to doepen free and rigorous exchange and liaison between the organs of reseach and teaching on the one hand, and Society at home and abroad on the other hand; to pursue research and teaching while bringing internasonal Cooperation to fruition, and there by to educate able people with a creative intelligence and arich humanity;and to Contribute to the development of science and culture.

「敎育社會學」歷史에 關한 考察

李俊球 弘益大學校 1981 弘大論叢 Vol.13 No.-

It is generally agreed among Sociologists that Emile Durkheim, in the late 1800s, first clearly indicated the need for a "sociological" approach to the study of Education. During the whole of his teaching life at the universities of Bordeaux and Paris, Durkheim taught educational theory and practice as well as sociology. In his lectures at the Sorbonne, Durkheim began by saying that he viewed education as a Sociologist, and that he considered education "to be something essentically social in Character, in its origins and its function, and that as a result the theory of education relates more clearly to sociology than to any other science." (Emile Durkheim, Education and Sociology (New York, The Free Press, 1956) Durkheim was emphatic in pointing out that there was no single or ideal type of education for all men. He expressed the opinion that differences in sociocultural needs would play a major role in the type of educational programs which are established in various societies. He noted that education is not a static phenomenon but a dynamic and ever-changing process. We have only to note a few of the many current efforts organized around implementing of schools, changing admission criteria, desegregation proposals, preschool programs, and community education to note accuracy of Durkheim's observation. Ⅰ. 敎育社會學史 硏究의 意義 Ⅱ. 敎育社會學 前史 1. 社會的敎育學---敎育에서 社會性의 發見 2. 社會學側---敎育의 認識 Ⅲ. 敎育社會學의 發達과 現狀 1. 프랑스의 敎育社會學 2. 獨逸의 敎育社會學 3. 英國의 敎育社會學 4. 美國의 敎育社會學 5. 日本의 敎育社會學 Ⅳ. 敎育社會學의 發達過程의 特徵 Ⅴ. 參考文獻

轉換期의 韓國社會에 關한 硏究 : An Analysis of Its Structure and Ideology 그 構造와 意識의分析

李璋鉉,李俊球 弘益大學校 1989 弘大論叢 Vol.21 No.1

In this study, the basic direction of Korean society in turning point was divided into two. 1. The changes of consciousness and conduct in all sections of Korean society in cataclysm were analyzed, focusing on the fact that Korean society in cataclysm is a change of its consciousness of value. 2. In regard of social structure of Korea and its change, a change of vocational structure attendant upon industrialization and social stratum, was analyzed. 3. 1 is about a process of converting an industry-oriented society to a human-oriented society as a movement to find a Life worth Living, that is, of moving from a developing society to a valuable society. 2 is about a movement to raise social position ; it is possible to change a social stratum, hence is means that a change of social and vocational positions. In conclusion, Korea society during transition period, strived for a qualitative conversion, not a quantitative one before the 1970s.

韓國近代의 그리스도敎系 學校와 民族主義 : Refraction and Development of National consciousness 民族意識의 屈折과 展開

李俊球 弘益大學校 1991 弘大論叢 Vol.23 No.1

This article is concerned with the relation of christianity to education. In particular, as problems of christianity is considered from a view of nationality, it is very important that christianity is a foreign religion. With that point, acceptance and assimilation of christianity into this land, further, the process of development of the modern education is considered by a christianity turn. Therefore, it can be asserbed that acceptance of Protestantism ad educational movements by missionaries have encouraged the development of the modern education in Korea.