소형펀치 크리프 시험을 이용한 9Cr강의 크리프 상수 평가

윤기봉,박태규,심상훈,정일석,Yun, Gi-Bong,Park, Tae-Gyu,Sim, Sang-Hun,Jeong, Il-Seok 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.9

Recently small punch creep testing (or miniature disc bend creep test) has received much attention through European collaborative research projects. This method was considered as a substitute for the conventional creep rupture testing by which the residual creep life is measured from the specimen taken out from serviced components of high temperature plants. It would be beneficial if the material creep properties such as power law creep constants as well as the creep rupture life can be measured from the small punch creep test. In this paper a method of assessing creep constants from the small punch creep testing is proposed. Finite element analyses were performed to investigate evolution of stress and strain rate at the weakest locations of the small punch creep specimen. Elastic-plastic-secondary creep analyses were carried out. The estimation equations for creep constants by the small punch creep testing are proposed based on the finite analysis results. Small punch creep tests were also performed with 9Cr steel and the accuracy of the proposed equation was verified by the experimental results.

재료의 소성 거동을 고려한 용접 계면균열의 Ct 매개변수

윤기봉,이진상,Yun, Gi-Bong,Lee, Jin-Sang 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.3

In this study, behavior of $C_t$ which is a well-known fracture parameter characterizing creep crack growth rate, is investigated for weld interface cracks. Finite element analyses were per formed for a C(T) specimen under constant loading condition for elastic-plastic-creeping materials. In modeling C(T) geometry, an interface was employed along the crack plane which simulated the interface between weld and base metals. The $C_t$ versus time relations were obtained under various creep constant combinations and plastic constant combinations for weld and base metals, respectively. A unified $C_t$ versus time curve is obtained by normalizing $C_t$ with $C^*$ and t with $t_T$ for all the cases of material constant variations.

용접부의 고온 재료물성에 대한 실험적 연구

백운봉,윤기봉,서창민,이해무,Baek, Un-Bong,Yun, Gi-Bong,Seo, Chang-Min,Lee, Hae-Mu 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.12

High temperature material properties of a welded joint were experimentally studied. Tensile and creep properties were measured for each part of weld metal. HAZ(heat affected zone) and parent metal at 538$^{\circ}C$. HAZ metal was obtained by a simulated heat treatment. Results showed that the order of tensile strength is weld>HAZ> parent both at 24$^{\circ}C$ and at 538$^{\circ}C$. Creep resistance was also the highest for weld metal and lowest for parent metal. Creep rupture life curves were obtained and converted to Monkman-Grant relation which is useful for life assessment. Use of the data obtained in this study is discussed.

표면균열을 갖는 원형봉재 시편을 이용한 고온 피로균열성장 연구

소태원,윤기봉,So, Tae-Won,Yun, Gi-Bong 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11

The compact tension specimen geometry has been widely used for measuring fatigue crack growth rates at elevated temperature when the fatigue load is under tension/tension condition. However, most of the elevated temperature components which have significant crack growth life experience fatigue load under tension/compression conditions. Thus test techniques are required since the compact tension specimen cannot be used for tension/compression loading. In this paper, a simplified test procedure for measureing fatigue crack growth rates is proposed, which employs a round bar specimen with a small surface crack. Fatigue crack growth rates under tension/ tension loading conditions at elevated temperature were measured according to the proposed procedure and compared with those previously measured by C/(T) specimens. Since both the measured crack growth rates were comparable, the fatigue crack growth rates under tension/ compression load can be reliably measured by the proposed procedure. For monitoring crack depth. DC electric potential method is employed and an optimal probe location and current input conditions were proposed.

소형펀치 크리프 시험중 측정하는 변수에 대한 연구

박태규,심상훈,윤기봉,장창희,Park, Tae-Gyu,Sim, Sang-Hun,Yun, Gi-Bong,Jang, Chang-Hui 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.1

An effect is made in this study to deepen understanding of small punch(SP) creep testing which has been a round for about 10 years as a substitute for the conventional uniaxial creep testing. Even though considerable numbers of SP creep test program have been performed, most of the tests were aimed at measuring creep rupture lives only. Very flew studies showed interest on the meaning of what we were really measuring during the SP creep tests. In this paper meanings of the parameters measured during the SP creep testing, such as punch load and punch displacement rate are investigated using finite element analysis. It was shown that the measured parameters must represent the stress and strain rates of the material at the annular region located at about 0.65 mm from the center of the SP specimen. The material in this location would go through constant maximum stress and strain rate during the testing. Experimental verification is also discussed.

기획논문: 신종교와 음식(2) : 한국의 개고기 식용문화에 관한 종교인의 의식 조사 -대순진리회 사례를 중심으로-

정지윤 ( Ji Yun Jeong ),윤기봉 ( Gi Bong Yun ) 한국신종교학회 2015 신종교연구 Vol.32 No.-

145년의 역사적 배경을 지닌 대순진리회에서 수도인들에게 개고기 섭취는 현재까지 꾸준히 이어지고 있는 음식문화 중 하나이다. 이러한 음식문화가 현재 동물보호단체들에 의해 집중적으로 금기 식품으로 압력이 가해지는 데 관하여 단순히 그것이 음식문화의 차이라든가, 전통습속의 문제라는 이유로 간단히 무시해 버릴 수는 없다. 왜냐하면 종교안에서 음식은 종교적 이념이 실제로 생활 속에서 어떻게 실천되는가를 살피는 데 매우 유효한 매개물이기 때문이다. 이 글은 대순진리회 수도인들이 개고기 음식문화를 어떻게 받아들이고 있으며, 현재 수도인들에게 그것이 실질적으로 지켜지고 있는지 그리고 이러한 음식문화가 수도인들의 신앙적 정체성에 어떠한 역할을 하는지에 관하여 연구한 것이다. 그 결과를 요약하면 증산은 하층민인 농민의 노고(勞苦)를 위하고 상등인으로 해원 시키고자 개고기를 섭취하였으며, 인간에게 이용만 당하고 매정하게 쫓김 당한망량의 원(怨)을 풀어주고자 망량이 즐긴 개고기를 섭취하였음을 그의 언설에 나타난 문헌 연구를 통해 유추할 수 있었다. 이처럼 증산의 해원(解.)의 범위는 인간에만 국한된 것이 아니라 자연 사물과 나아가 신의 세계에 이르기까지 전 우주적인 범위를 포함한다. 따라서 증산의 개고기 섭취는 선천(先天)이 부조리를 뜯어고치고 후천(後天)의 새 운수를 여는 종교 행위인 천지공사와 긴밀한 관련성을 맺고 있는 해원의 상징적 행위로 이해될 수 있다. 이러한 해원의 상징적 의미를 지니는 증산의 개고기 섭취는 현재 대순진리회 수도인에게 어떻게 이해되고 있는지 설문지와 인터뷰를 통해 살펴보았다. 수도인들에게 개고기 섭취는 조선 시대에 농민(천민)들이 극심한 체력 소모가 있을 때 손쉽게 구하여 먹을 수 있던 농민의 음식이며, 우당 제세시 무더운 여름 힘든 노동이 있는 날이면 보양식 차원으로 섭취했던 전통 음식문화로 이해되고 있었다. 따라서 대순진리회에서 개고기 섭취는 교리 안에서 권위도 규칙도 권유사항도 아니다. 이 글을 계기로 대순사상의 음식이 지닌 상징성을 보다 심층적으로 연구할 수 있기를 기대해본다. In Daesoonjinrihoe where there is 145 years of historical background, the tradition of taking canine flesh has been continued up to present. The fact that this culinary culture is put under pressure as incepting a taboo food by animal protection group cannot simply be ignored as a lack of understanding on the difference of culinary culture or the problem of traditional convention. It is because the food in religion is a very effective media to check how the religious idea is practised in actual life. In this regard, this article investigates how the cultivators in Daesoonjinrihoe responds to canine flesh culinary culture, whether it is effectively observed, and which role it contributes to the identity formation in religious belief of cultivators. Summing up the overall result, we can infer the following facts from the literature research on Jeungsan``s discourse. First, Jeungsan took canine flesh to console and relieve the grudges of peasants of a lower classes so that they can be treated by and among themselves as a first class people. Second, he took it to relieve the grudges of goblins who were thrown out after being sucked in by human beings. Likewise, the scope of Jeungsan``s work of relieving the grievances is not confined to human beings, but can be incorporated into the universal scope, all-encompassing the spiritual realm as well as natural things. Accordingly, Jeungsan``s intake of canine flesh can be understood as a symbolic act of relieving the grievances which are germane to the Reordering of the Universe as a religious act, rectifying absurdity of the previous world while opening a new fortune of the later world. Through questionnaire and interview, we have investigated how Jeungsan``s intake of canine flesh is understood by the present cultivators of Daesoonjinrihoe. To cultivtors, the intake of canine flesh was understood as the peasants`` food of Joseon period, which can be easily taken in the time of extreme loss of energy. Further, during the period of Wudang, it was also understood as a traditional culinary culture, especially as a health food when there needs an elbow grease in summer. Therefore, the intake of canine flesh in Daesoonjinrihoe turns out neither to have any authority, rule, nor any recommendation. With this article as a momentum, we hope to see further studies flourishing on symbolism of the culinary culture in Daesoon thought.

WDM을 이용한 고속 광 지역망에서의 채널 액세스 프로토콜

강수구(Soo-Koo Kang),이호숙(Ho-Sook Lee),윤기봉(Gi-Bong Yun),김영천(Young-Chon Kim) 한국통신학회 1994 한국통신학회 학술대회논문집 Vol.1994 No.7

힌두이즘의 神性(Devata) 意味 小考

尹起鳳 대진대학교 1993 大眞論叢 Vol.1 No.-

Theisticand atheistic philosophies in India have often been mixed up with theological discussions which throw some light on the existence and nature of God. The idea of God is almost universal and instinctive also in India. India have a variety of pictures of God. This variety is easily intelligible when we realise that each religious genius spells out the mystery of God. In Rg-Veda these descriptions of God often conflict with one another But these descriptions depends on the concept of lower self and the concept of the Supreme Self in B.G. which may be outlined as below. 1) The lower self and the Supreme Self are both eternal. 2) The Supreme Self is an Infinite Unit. 3) The Supreme Self in the universe is omnipresent 4) Within a limited range, the lower self is allowed to function. 5) The Supreme Self is perfect in all respects. In this structure, Conclusion is that The formula 『Sat』alone could not have distingushed 'Him' from the two other entities that 『Cit』. Sat-Cit would confuse him with the souls, as they both 'are and know' Sat-Cit-anand brings out both his similarities with and points of difference from souls and matter.

후천개벽의 종교학적 연구

윤기봉,유승종 대진대학교 1995 大眞論叢 Vol.3 No.-

The main purpose of this study is in the examination of concept of Hu-Chun-Gae-Byuk. The problem of dukkha and diease has alway played an important part in the attitude of Dae Soon and Buddhism. One of the Cardinal and noble truths of Buddhism was that everything was sorrow. And all regrets was of moral origin and the culmination of morality is in theory of Hae-Won. Man is asked to proceed on the course of moral struggles for the removal of diease and sorrow. And so the object of actions and feelings, Charity are the stimulation of moral progress. Conclusionally the concept of Hu-Chun-Gae-Byuk define in terms of its highest ideals and perfection of its moral culture. in Dae Soon thoughts.

業說의 始原과 變遷에 관한 小考 : Its Origin & Interpretation in Jainism

尹起鳳 대진대학교 1993 大眞論叢 Vol.1 No.-

The main purpose of this study is in the examination of the Karma theory. The theory of Karma has played a very important role in philosophical, religious discourses and in the lives of Hindu, for over 4000 years. Karma is an extension of the vedic conception of rta and istapurta (ChⅡ). Rta in the thought of the Rg-Veda is the principle of Cosmic order which controls, unifies all phenomena. The origin of Karma is also traced to the ritualistic tradion of the Vedic Indians to ista purta. Dosa is the Rg-Veda (ChⅡ-2) is understood as the violation of the moral law and as ritualistic pollution. Karma is the apprehension and expression of the moral order of the universe and dosa is an expression of man's need for purity and the supreme good. The Jain theory of Karma (Chⅲ) is the most comprehensive of all in providing us with details of Karmic processes of its operation. Like Buddhism, Jainism also does not believe in the existence of a monotheistic God. What distinguishes Jaina conception of Karma from ancient India is its conception of Karma from ancient India is its conception of Karma as material As I descrived in outline above, Karma is in the center of all the conception in the Jaina, and Buddhism.