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자동차용 브레이크 마찰재에서의 환원분철의 마찰특성에 관한 연구
정진오,이경환,김옥삼,김봉수 순천대학교 2000 순천대학교 자연과학논문집 Vol.19 No.1
In most automotive brakes, the friction material is used to convert the kinetic energy into heat. The friction material is a complex composite consisting of a resin, reinforcing fibers, lubricants and filler materials. In an attempt to enhance the friction performance of the friction material, a trial was done to examine the substitution of filler material by the reduction iron powder. In this study, two types of reduction powder M1 and M3 was prepared by the reduction process developed by Hanta M&B Inc. M1 and M3 which has reduction ratio of 1.5 and 92% respectively was used in place of BaSO_4, which was conventionally used as a filler material. The amount of M1 and M3 was varied as 10, 20, 30%, while the other component remains the same except the replaced BaSO_4. For those specimens with different amount of reduction iron powder, friction performance tests such as friction coefficient, rotor compatibility were conducted by using brake dynamometer. The bonding strength and hardness tend to decrease with use of M1 and M3, but specific weight decreased with increase of M1 and M3. The friction coefficient increased with use of M1 up to 10%, but decreased for use of M1 more than 20%. However the use of M3 resulted in a decrease of friction coefficient all the way. The surface roughness decreased with the use of M1 and M3, except for a case of excessive use of M1 of 30%. The rotor surface roughness did not show any correspondence with hardness of friction material in this study.
정진오 順天大學校 1994 論文集 Vol.13 No.1
□A finite element analysis was performed to study the failure mechanism in the cell-type structure which consists of two skin flange plates and connecting web plates. Compressive patch loads of different boundary conditions were applied to the structure, and the web crippling damage mechanism and its characteristics were studied through analysis of strains and deflections as compared to the load. A load vs. horizontal deflection curve was intended to determine the load at which buckling initiated, but the deflection increased rather gradually due to initial imperfection of web. The strain measurements from each side of the web plate as a function of load showed a separation of the strains, which implied that the buckling triggered the web crippling. The distributions of compressive strains along a vertical line under the load patch showed a strain concentration in the upper regions of the web until ultimate load was reached, and a redistribution of the strain resulted in maximum strains at a certain depth of the web. These findings were in good agreement with the experimental results by Schneider et al. The distributions of the out-of plane deformation of the web changed with the boundary condition in patch load. The deformation mode in foundation load did not change, while in docking load the deformation mode showed a transition as the deformation progressed.
밀링가공시 구상흑연주철(FCD50)의 표면거칠기에 대한 연구
홍순남,정진오 順天大學校 1999 論文集 Vol.18 No.1
The purpose of this study is to find changes in surface roughness in various endmill cutting conditions for ductile cast iron (FCD50). Two materials were used as cut materials; one casted material without heat treatment, and the other annealing heat treated at 730℃ for the material. As a cutting tool 16mm tow flute endmills coated with TiN were used. The cutting speed, table feed speed, and cutting depth were varied respectively, and the surface roughness of the machined surface were measured by a contour measuring machine. Test results showed that the surface roughness did not vary much with the table speed, but it increased as the cutting speed increased, irrespective of the materials. The surface roughness increased also as the cutting depth increased. For the cutting condition where the amount of cut material per unit mill revolution kept constant, the surface roughness did not change much with cutting speed for small cutting depth, while for large cutting depth the surface roughness increased with increase in cutting speed. The surface roughness for the heat treated material showed better quality than that without heat treated especially when the cutting depth was large.
정진오,이재경,김형진 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.5
배관의 관벽투과 특성을 지닌 원격장 와전류 비파괴 검사법은 열교환기 세관 검사에서부터 천연가스 수송관에 이르기까지 다양한 형태의 배관과 결함을 대상으로 적용 연구가 진행되고 있다. 공칭 외경 100㎜의 주철관은 주로 상수도 관로의 배수관으로 활용되고 있는데, 차량 진동과 부식에 의한 결합의 생성으로 정수의 누수 문제를 일으킨다. 그러나, 탐상 경제성 및 효용성 문제로 관내 검사장치 투입과 같은 직접적인 검사 방법의 수행이 제한되어 왔다. 원격장 와전류 방법은 시스템 구성이 용이하고, 내·외부 부식 결함에 대한 정량적인 평가가 가능하기 때문에 경제성 있는 장치 개발이 가능하다. 본 연구에서는 원격장 와전류 기술을 이용하여 상수도 관망의 특성을 고려한 매설 배관 검사시 스템 개발을 수행하였다. 세부적으로는 관내 투입 원격장 와전류 검사의 기구부 설계 및 제작, 원격장 와전류 신호의 획득 및 처리 프로그램 개발, 그리고 개발 장치의 운용 방법 및 절차 검토 등으로 되어 있다. Remote field eddy current testing (RFECT) with through-wall transmission characteristic is being applied to pipes ranging from small tubes of heat exchanger to natural gas supply pipelines. Cast iron popes with nominal diameter of 100㎜ are used primarily as the waterline pipes. The leakage of water occurs due to defects in the pipes caused by vibration of automobiles and corrosion. But, the use of direct inspection methods such as insertion of inspection equipment inside the pipelines has been limited due to its lack of economical efficiency. Economical development of inspection equipments is possible since RFECT method can be easily employed for system integration and quantitative evaluation of both inside and outside defects. In this study, the development of underground pipeline inspection system was carried out by using RFECT method in consideration of the characteristics of waterline network. This paper specifically describes the design and production of RFECT pipeline inspection pig using centralizer mechanism, development of remote field eddy current signal acquisition and processing software, and review of RFECT system operation procedures.
鄭鎭午 제주대학교 1983 논문집 Vol.16 No.2
In study of theories of modernization, we need phenomenological approach. And the goal of modernization is commonly self-supporting economy. The material conditions of life must be accompanied by the spiritual elevation and most of the developing countries also need nationalism.
중년기 종교 활동과 신앙성숙도가 부부생활만족도에 미치는 영향분석연구
정진오,변상해,김종수 한국벤처창업학회 2009 한국벤처창업학회 학술대회 Vol.2009 No.10
본 연구는 인생의 봄은 지나고 인생의 가을을 맞이하는 중년기부부관계는 결혼 전의 영향도 있지만 결혼 후에 발생하는 갈등요인이 더 많이 있다. 이유는 부부 사이의 태도와 안정되고 적절한 수입 그리고 종교 활동과 신앙성숙이 부부생활만족과의 깊은 관계가 있다고 본다. C. G. Jung은 인생의 전반기를 자기확산기로, 후반기는 자기수렴기로 구분하였는데, 자기 확산기에는 외부적.물질적 자아에 몰두하는 반면, 자기 수렴기에는 종교적 철학적 직관적 정신세계에 몰두해야만 인생전체가 균형과 통합을 이루는 중년기로 보았다. 이는 중년기의 발달과 심리적 위기를 잘 극복하고 보내면 노년기를 행복하게 맞는다. 본 연구는 중년기의 정의와 중년기의 발달특성, 중년기에서의 종교와 종교에서의 부부관계와 중년기 부부변화가 무엇인가를 연구한 후 종교에 대한 이해를 중점으로 중년기부부 생활만족도에 대한 이론들을 문헌연구로 제시하였다. 양적연구는 중년기 종교 활동과 신앙성숙도의 변인들이 중년기 부부생활만족도에 미치는 영향을 분석하기 위해 서울 및 수도권 내에 있는 35세 부터 60세 까지의 중년기를 연구대상으로, 2009년 3월 25일 부터 4월30일 까지 400명에게 중년기 종교 활동과 신앙성숙도 그리고 부부생활만족도 등을 설문하고 통계 처리하여 결과를 분석하였다. 첫째, 종교 활동과 신앙성숙도의 관계에서 신앙성숙도의 봉사, 관계, 영성은 종교활동에 정(+)의 영향을 미치는 것으로 보였다. 이 결과는 영성적, 개인적, 공식적종교 활동은 신앙성숙도에 영향이 있음을 말한다. 둘째, 종교 활동에 따른 신앙성숙도와 부부생활만족도의 관계에서 종교 활동(t=31.36, p<.001)이 신앙성숙도에 정(+)의 영향을 미치는 것과 종교활동(t=33.81, p<.001)이 부부생활만족도에 정(+)의 영향을 미치는 것, 그리고 신앙성숙도(t=28.64, p<.001)가 부부생활만족도에 정(+)의 영향을 미치는 것으로 종교 활동에 따른 신앙성숙도와 부부생활만족도에는 인과관계가 있음을 말한다. 셋째, 중년기 종교 활동과 신앙성숙도와 부부생활만족도의 관계에서 부부생활만족도에 대해서 종교 활동과 신앙성숙도 사이에 주요효과를 분석한 결과 종교 활동(F=15.95, p<.001)과 신앙성숙도(F=23.94, p<.001)는 부부생활만족도에 유의한 영향을 미치는 것으로 보였다. 이러한 연구결과는 종교 활동과 신앙성숙도와 부부생활만족도 사이에 관계성이 높은 것으로 기독교 불교 천주교의 종교 활동과 신앙성숙도가 중년기 부부생활만족도에 중요한 영향을 미치는 것을 알 수 있다. The study has found that the main reasons affecting to the mature conjugal relations of middle-aged persons are closely related with sede factors brought about after marriage. Comparatively the factors before marriage have more or less weak power on the conjugal relations. They are mature relations wp between husbands and wives, stable and enough incede, and religious activities, which have deep relations with the satisfactory conjugal relations. C. G. Jung divided the whole life span as self-assuredness period in the first half and self-convergence period in the second half. The first is the period when one does his or her best to get external and physical self. On the contrary, the second is the middle-aged period one finds his or her meaning of life in the religious, philosophical, intuitional, and spiritual world, which lead life into harmony and integration. Therefore if one overcomes some psychological crisis related with middle-aged development he or she can enjoy happy senescence(old age). The study has suggested through literature investigation the definition of middle age and the developmental traits of middle age, and the relations between religions and conjugal relations of middle-aged husbands and wives. Futhermore, it has analyzed the theories which religions have close relations with the life satisfaction of middle-aged conjugal relations. In order to give an analysis the influence of the variable of religious activities and religious maturity, with the degree of conjugal satisfaction, 400 middle age are selected as the object of the study whose ages are ranging from 35 years to 60 years, and who reside in Seoul or near Seoul. They were asked to fill out the questionnaires asking about religious activities, religious maturity, and the conjugal satisfaction from March 25th to April 30th, 2009. The results of the survey have been statistically processed and analyzed. First, the higher religious maturity gives positive influence on the general religious activities including public service, human relations, and spiritual stability. That is, this result indicates that the individual, spiritual, and formal religious activities give to a degree influence on the religious maturity. Second, the maturity of religious life resulting from religious activities has a causation with the satisfaction of conjugal life. In more details, religious activities has a positive influence on the satisfaction of conjugal life(T=31.36, p<.001) In more details, religious activities has a positive influence on the religious maturity(T=31.36, p<.001), and religious activities has a positive influence on the satisfaction of conjugal life(T=33.81, p<.001), and the religious maturity has a positive influence on the satisfaction of conjugal life(T=28.64, p<.001) Third, as we analyze the main effects which religious activities and the religious maturity could give influence on the satisfaction of conjugal life, it is found that both religious activities(F=15.95, p<.001) and the religious maturity(F=23.94, p<.001) give a positive influence on the satisfaction of conjugal life. In conclusion, it is sure that religious activities and the religious maturity have a close relations with the satisfaction of conjugal life. Therefore it can be said that religious activities at the protestant religion, buddhism, and catholic religion can give an important influence on the satisfaction of middle-aged conjugal life.