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.

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)

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.

60年代의 新興諸國(亞細亞 . 아프리카)의 政治發展에 關한 硏究

李俊球 弘益大學校 1984 弘大論叢 Vol.16 No.1

1. Truth and ideology; The question of the relationship between truth and ideology has been raised by the tradition of European thought which culminated in marxism and in the sociology of knowledge developed by Mannheim according to this view, ideology is by its nature untruthful, since it entails a "masking" or "veiling" of unavowed and unperceived motives or "interests." These interests impel the deception of antagonists and the transfiguraton of narrow sectional ends and interests by means of an ostensible universalization. They distort reality for the ideologists and for their antagonists. Thus, in this view, ideology is a manifestation of a "false consciousness." 2. The spread of nationalism ; The twentieth century has added another revolutionary dimension to nationalism. Nationalism has also become a socially revolutionary movement, demanding equal economic and educational opportunities for all members of the national group and the active promotion of the welfare of the socially underprivileged classes. Its aims have become the establishment of a classless, theoretically equalitarian century, all "young" nationalist movements had also become "socialist" movements-the word "socialism" covering as many different manifestations as the word "nationalism"-whereas the "young" nationalist movements of the middle of the nineteeth century had sharply distinguished between nationalism and socialism. 3. Socialism-By 1840 the term "socialism" was commonly used throughout Europoto Connote the doctrine that the ownership and control of the means of production-capital, land, or property-should be held by the community as a whole and administered in the interests of all. Within 120 years after the term became known in Europe, the doctrine had spread so widely that one could find regimes in Sweden, Great Britain, the Soviet Union, China, Eastern Europe, Cuba, Algeria, Egypt, Syria, Israel, Guinea, Kneya, Tanzania, India, Burma, an Ceylon calling themselves socialists, and the labels Arab socialism, and Asian socialism used to describe the grafting of indigenous traditions onto ideological doctrine. Rarely in the history of the world has an idea taken hold so deeply and dispersed so quickly. One would have to go back to the spread of Lslam, in the century and a half following the death of Muhammad, to find a comparable phenomenon. And the analogy is not without relevance, for one finds in both instances the promise of a perfect community. The effort to create a solidarity larger than that of tribe or class, a reaction to the meaninglessness of existing religious bleiefs, a militant proselytizing spirit, and leadership by new elites. In fact, the comparison with Lslam is meant to suggest that the spread of socialism cannot be wholly accounted for in economic or class terms, The socialist movement has(or had) the character of a secular religion, and only from this view can one explain its development and internal vicissitudes.

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.

사료용 교잡종 옥수수 연구 : Ⅲ. CNU와 SK계통을 이용한 교잡종 옥수수의 건물중 및 종실 수량

이희봉,김동욱,김준표,김용일,정재영,최현구,문현귀,이충열 충남대학교 농업과학연구소 2003 농업과학연구 Vol.30 No.2

공시 교잡종에 대한 각 지역에서 선발된 우수 교잡종의 간장 및 착수고는 대조구와 비슷한 경향이었으며, 생체 및 건물수량은 분얼수 및 간장과 관련이 큰 것으로 나타났으나 재식 밀도와 기상상태와도 밀접한 관계로 나타났다. 따라서 생체중은 대전지역에서 재배된 교잡종 H67이 대조구인 광안옥에 비해 53.2%로 높았고, 수원에서 역시 41.8%으로 높았으며, 종실수량은 H15과 H67에서 대조구보다 11.7%와 9.7%로 각각 높게 나타났다. 대전에서 분얼성인 H42와 무얼성인 H65에서 대조구보다 9.1%, 5.2%증가하였고, 수원에서는 분얼성이 H42와 무얼성인 H65에서 대조구보다 9.1%, 8.5% 증가하여 교잡종간, 지역간에 큰 차이를 보였다. 한편 후기 녹체성은 무얼형보다 분얼형에서 낮은 경향을 보였는데 SK계통과 교배된 조합에서 우수한 편으로 나타나 우수 교잡종 육성시 중요 고려사항으로 지적되었다. In order to develop the crude forage maize hybrids with high dry matter and grain yield, several hybrids evaluated as superior hybrids at three regions in 2001. They were planted and surveyed again for the second selection in 2002. The selected hybrids showed large difference in some major characteristics according to planting areas and dates(Suwon : April 25. Daejeon : May 15 and Milyang : May 25), but insect and disease injury were similar to check. Fresh and dry weight of the H67 hybrid at Suwon and Daejeon was the highest among hybrids including check, but low in Milyang due to raining after flowering. Grain yield was higher than check in H15 at Suwon H45 and H37 at Daejeon and H67 at Milyang.

敎育文化的 人間學 : -With Special Reference to the Formation of Personality- -人間形成을 中心으로-

李俊球 弘益大學校 1992 弘大論叢 Vol.24 No.1

1.The ideal of education is self-education.Its ultimate aim is to form a personality capable of self-education. 2.In terms of personality formation,the word,culture,comprehensively means all the aspects of custom,system,law,art,and religion based on human spirits. 3.A culture is symbolically represented by the members who live in that culture.In other words,it is a kind of self-representation of the self-formulated people's emotion,thought and behavioral method.This means that the culture and personality formation are directly linked. 4.The culture is mulitipolar and ripple-effective.Therefore,human goal is not achiving unformity,but establishing plural cultures. 5.In this paper,we dealt with this relationship between culture and human affairs,and the mutual relation between education and culture.

近代化의 特性에 關한 一硏究

李俊球 弘益大學校 1983 弘大論叢 Vol.15 No.1

1) Modernization is the Current term for an old process-the process of social change where by less developed societies acquire characteristics common to more developed Societies. The process is activated by international or intersocietal, Communication. 2) Modernization, therefore, is the process of Social change in which development is the economic component. Modernization produces the Societal environment in which rising output per head is effectively in - corporated, for effective incorporation, the heads that produce (and consume) rising output must understand and accept the new rules of the game deeply enough to improve their own productive behavior and to diffuse it througbout their Society. 3) The history of china and Japan in the Second half of the nineteenth century without coming to the conclusion that suchfactors as social structure value, systems, and guiding ideals have an important bearing on modernization and economic grouth-indeed, more bearing than physical factors such as natural resources or even the factor of outside stimulus.

「小集團」硏究에 關한 理論的 考察 : -社會學. 社會心理學을 中心으로-

李俊球 弘益大學校 1980 弘大論叢 Vol.12 No.-

(1) Types of Small Groups Sociologists often consider serveral "levels" of social systems, which differ not only n size but in complexity. A common classification of social systems ranges from minimum to maximum complexity and includes the "indivdual," the "dyad" the "small group" the "organization" and the "society" note that the dyad-adialogue between only two interacting individuals-is a level of complexity between the individual and the small group. Hence, for reasons which shall be appearent in later chapters, the small group requires a minimum of three members. Our concern is with the small group and its members. Factors outside the boundaries of that social system shall be deemed lessimportant. But many different types of small groups exist within organizations and societies. And not all of these small groups can be characterized by possessing decision-making purposes. While all small groups reflect many characteristics in commmon, the purpose peculiar to one type of small group renders it quite different from other. small groups with different purposes. Viewing group decision making in perspective necessitates a survey of the common types of groups. And since groups are generally classified according to the purpose they intend to accomplish, awareness of the purposes performed by small groups and for which small groups are formed an maintained. During the past ten or fifteen years the "thaning group," or T-group as it is commonly known, has become extremely popular throughout our society. Despite the numerous variations among training groups, we shall consider all groups which exist for the general purpose of interpersonal growth within the generic definition of training groups.Common varieties of training groups include sensitivity traning groups, encounter groups, confrontation groups, awareneess groups, synanon-type groups, discovery grups, sensory awareness groups, creativity workshops, and a host of other variations too numerous to mention. "Therapy for normal people" is one over simplified explanation of the purpose served by training groups. Generally a training groups attempts to modify the normal behaviors of its members through developing interpersonal sensitivity, human relations skill, mutual trust, and a freer expression of personal feelings, in short, the purpose of a training groups is the interpersonal development and growth of its participating members. While specific devicesand techniques may vary from one kid of training group to another, the basic purpose of all training groups remains similar- behavioral change through interpersonal growth. (2) The Group as a System The idenity of a groups apart from the identities of its individual members-"groupness"-has bee established. A more common method of expressing this same principle is literally a chliche-that is, a group is "more than sum of it sparts." This principle of nonsummativity assumes that individual components comprise a single entity and, turther, is characteristic of a system. A entire body of theoretical knowledge, commonly known as general system theory may be beneficial to furthering our understanding of the group process. A "system" may be defined simply as an entity which behaves as an entity because of the interdependence of its component parts. a group-system, then is a group which behaves collectively as a group because of the interdependece of its members. Every system possesses three elements which describe its existence-structure, function, and evolution. The structure of a system may be regarded as the physical arrangement of components in space at any given point in time, if a cake were considered as a system, the components of the cake are the ingredients-flour, shortening, baking powder, eggs, milk, etc. After they are mixed in the bowl, these ingredients are relatively hmogeneously arrangedd in the structure of batter in which the dry ingredients (e.g., the flour and baking powder) are suspended in the homogeneousq liquid mixture( eggs, milk, shortening). The important thing to remember about systemic structure is the limitation imposed by space. Time is static in the determination of sturcture thus, the above structure of the cake is a description of the arrangement of ingredients as a specific point in time-the batter stage, after ingredients are mixed and before baking, naturally, the sturcture of the cake is different from one point in time to another, thus, a system undergoes continueous structural changes as time passes. (3) Sociometry Sociometric methods are also commonly utilized for observing small groups. Sociometry, whose pictorial representations of social relationships are often known as sociograms, concerns itself solely with selected elements of the social dimension of a system, essentially, sociometric methods seek to discover interpersonal attracions and repulsions among various members of the group, that is, the positive and negative feelings each group member has for each other member. While valuable as an insight into a group's socioemotinal dimension, sociometric methods afford at best only apartial view of the process of group development. By discovering the extent to which members are attracted to other members are attracted to other members and are willing to work with them in other endeavors, the observer has some basis for assessing the degree of cohesivess of that group. But in terms of any knowledge of a group's task dimension, sociometry is quite irrelevant.

大學內의 弘報機能과 大學新聞의 役割에 關한 硏究

李俊球 弘益大學校 敎育硏究所 1978 敎育硏究論叢 Vol.- No.1

This paper aims at the basic study to establish a theory for active use of the function of Public Relations in the college. But this study does not present some concrete plans, for it is carried out only through the references or books. To restore the academic reliability in the college, school authorities should stop the one-way publicty of its policy. The function of public relations should be reexamined for the expression of professors' and students' opinions and active exchange of mutual intention. Overall attention should be paid to college newspaper which plays an improtant part in bringing about effective public relations.