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- 저자 : 전재진 ( Jae Jin Jeon ) (검색결과 53 건)
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A Study on the Sound Radiation from a Clamped Circular Plate with Viscoelastic layer by Impact Force
전재진,이병호,Jeon, Jae-Jin,Lee, Byeong-Ho The Acoustical Society of Korea 1987 韓國音響學會誌 Vol.6 No.3
본 논문에서는 충격으로 인한 점탄성층을 가진 경계가 고정된 원형 평판으로부터의 음압복사에 대해 이론적, 실험적으로 연구한다. 층을 가진 평판의 운동을 모우드 해석법과 회전 관성효과와 전단력에 의한 변형을 고려한 Mindlin 의 평판이론으로부터 구한 고유치를 이용하여 구한다. 탄성구와 평판사이의 접촉력은 Hertz 이론으로 구하고 평판의 진동으로부터 복사되는 음압은 Rayleigh integral에 의해 구한다. 또한 층을 가진 평판으로부터 복사되는 음의 파형과 발생되는 음을 감소시키는 방법을 예측한다. In this paper, the sound radiation from a clamped circular plate with a viscoelastic layer excited by impact force is studied both analytically and experimentally. The composite plate vibrations are obtained by using the normal mode analysis and the eigenvalues are obtained by a Mindlin plate theory including the rotary inertia and shear deformation, The contact force developed between the ball and the plate with attached layers is obtained by Hertz contact theory. The radiated sound pressure is calculated by the Rayleigh integral. Prediction of the waveforms of sound radiating from the plate with attached layers and a method for reducing noise generation from the plate by impact force are also shown in this paper.
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FFT 방법을 이용한 음압복사에 대한 Rayleigh Integral 의 수치해석적 연구
전재진,Jeon, Jae-Jin 한국음향학회 1988 韓國音響學會誌 Vol.7 No.4
이 논문에서는 무한 격리벽내의 가장자리가 고정된 원형평판으로부터의 음압복사를 FFT 기법을 이용하여 계산하였다. 음장은 컴퓨터 계산시간을 절약하기 위해 Rayleigh integral 을 직접 수치해석적으로 구하는 대신에 공간영역에서 2차원 FFT 방법을 이용하였다. 그 결과 1/200의 시간을 절약할 수 있었다. FET방법은 원형평판형상 뿐만아니라 어떤 형상에도 적용 가능하며 복잡한 형상의 근거리 및 원거리 음장을 예측하는데 상당히 유효하다. In this paper, the sound radiation from a clamped circular plate in an infinite baffle is calculated by using the FFT technique. The radiated sound fields are obtained by two-dimensional fast Fourier transform method is the spatial domain instead of a direct numerical evaluation of Rayleigh integral for economy of the computation time. The computation time is consumed at least by 1/200 times of the direct numerical evaluation on the Rayleigh integral in acoustic fields. The FFT method can be applicable to any shaped geometry as well as circular plate. The FFT solution could be very powerful in predicting the near and far fields of complex structures.
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전재진(Jeon, Jae-Jin) 한국해양대학교 국제해양문제연구소 2013 해항도시문화교섭학 Vol.0 No.9
This study was about a ‘Dongyougamsangga’ which was written by Hambongpil who was a councilor of Hwanghae province of Joseon in the age of Japanese imperialism. Hambongpil was the head of a seongdong-myeon at suan-district, and the journalist of Dong-a daily report. Japanese imperialism was giving there trouble that it was impossible to rule over the Joseon by violence of a police after 3.1 movement. So they schemed out a way to obey the people of Joseon. That was a councilor of the whole country, and they cunning way to maneuver behind the people of Joseon. Japanese imperiaism often sent out a representative or council of Joseon to Japan for a tour of inspection about a chief industries in Japan. The purpose of this inspection was aimed for having a powerful influence over the man of power in Joseon, and made them a good cooperator for Japanese imperialism. Hambongpil has traveled throughout the Japan, including Shimonoseki, Mojiko, Beppu, Oita, Miyajima, Hiroshima, Itskushima, Osaka, Kobe, Kyoto, Toyohashi, Tokyo. Judging from his travel course, the district of his inspection was the mail cities of Kyushu and Honshu. And he gave an interest in the inspection of industry of Japan. Such a concern was expressed by his literary accomplishments borrowing a traditional literary genre. On the process of traveling, he admired a culture and industry of Japan as a fine one. In the concrete, it was a brick houses in Shiminoseki, a hot spring and harbor construction in Beppu, a competitive exhibition in Oita, an education for women and prosperity in Osaka, an industrial facility in Kobe, a power plant of Biwako in Kyoto, a reclaimed land in Toyohashi, a military establishments in Tokyo etc. Hambongpil described these scenery of Japan dividing 17 verses. And it was divided between a description of scenery and an expression of feelings. And he express an envy at the modern industrial developments of Japan. But he passed over one fact that Japanese imperial induced the disire of colony Joseon, on the other side, they interfered a development of financial business, agriculture, manufacturing industry in colony Joseon. On the ground of theory of Rene Girard, all desire was intermediated and exited by the others, so it was not spontaneous, but being intervented by outside. However it stands in a ironical, dual-regulation that was encouraged by the others, interfeared by them at the same time. On account of this dual-regulation, the envy of Hambongpil and its realization was a remote possibility.
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전재진 ( Jae Jin Jeon ) 서울대학교 인문학연구원 2013 인문논총 Vol.70 No.-
This essay was about “Gahyunsangok”(Song of Gahyun Mountain) that is included in Gobiyougo, a manuscript in the collection of Dankook University Museum. Although little is known about the author or the time that the song was created, we can surmise that it is a record of Joseon nobility, through the evidence of the custom in which descendants wrote down their ancestor`s biographies. The ‘Song of Gahyun Mountain’ appears to have a particularly close relation to Sangchon Sin Heum who was a government official and famous poet. He was a minister during King Seonjo`s reign and he was given the order to protect Prince Youngchang after the death of King Seonjo. But Prince Gwanghae who was step-brother to Youngchang became king and Sinheum was ousted from officialdom for his actions of protecting Prince Youngchang. He went back to the area of his ancestor`s tomb after being expelled from officialdom and his main concern became the Book of Changes for living in Gahyun Mountain. His attitude towards life was to know the order of the heavens and to follow it naturally. This special quality of such a life can also be found in the ‘Song of Gahyun Mountain’. The speaker of the poem talks about his free life at Gahyun Mountain and how he was satisfied by himself. In addition, the ‘Song of Gahyun Mountain’ is similar to “Banggahaeng”, a poem by Sin Heum. Especially, the introduction of both works share a common feature, such as the paragraph “small town and sky in Gahyun Mountain...” And there is also the common fact that both the speaker of the poem and Sin Heum have an interest in the Book of Changes, are are concerned not with posterior changes but native changes. This was a special phenomenon in the Joseon period and not common tendency. Such an analysis on the song of Gahyun Mountain presented in this paper will act to compliment and enhance studies on the work of Sin Heum, and the cultural contents of Gimpo, Gyonggi Province.
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문학과 문화 : 「경인행가(京仁行歌)」의 인천풍경(仁川風景)과 경성가금공진회(京城家禽共進會)
전재진 ( Jae Jin Jeon ) 한서대학교 동양고전연구소 2011 동방학 Vol.21 No.-
This essay was studied on 「kyunginhaengga(京仁行歌)」written by Hambongpil in April, 1925. Hambongpil arrived at Incheon with students and the other local representations as a head chief of township-Seongdong, Suan district, Hwang-Hae province. And then, he saw through the modern scenery of Incheon, and was presented at the performance of Japanese warship which was put in at Incheon. The naval review hold from 17 to 20, April, and the number of participants was 40 thousand persons in all. Following the naval review, Hambongpil attend the exhibition of a domestic fowl which have opened at Kyungbok-palace. And then, he studied by inspection zoo, botanical gardens, museum which was near the Changkyung palace, and this complexity was a representative system that have been made for the unity of nation-state in modern period. Over there, the Japanese imperialism makes the tourist of the exhibition of a domestic fowl to see and experience the modern representations by the Japan. Thus far, we grasp the behavior and view point of Hambongpil based on the text of 「kyunginhaengga」, and can know the fact as follows. The first, there was a view point being made other people by oneself. Ham have a concern about spreading modern education at a locality as a public-spirited men of the Suan, Hwanghae province. But he take a cold and objective view point that is excluded a national sentiment. The second, there was no existence like a sentiments about the exhibition that was a event of disgrace to the Changkyung palace, and the scenery damaged and remolded into zoo, botanical garden without leave. Of course, because the 『chosen』 was a organ of government-general, we could not expect the speech like that. But conversely if ham had have a resentment about like this situation, he would rather not make a comment. Nevertheless he described a event that was open in the damaged palace of a colony with a disinterested attitude. In the middle age, the scenery was a subject of an inside view and cultivating of the mind. But in the modern ages, it was an object of consumption. And there was a purpose of producer at the object of consumption. The exhibition of a domestic fowl, three-park(zoo, museum, botanical garden) were contained a high-level imperialistic strategy for the unity of states, nations. In spite of, author did not know the intention, he producted this literary work as a person in modern system. For this reason, 「kyunginhaengga」was a work that reflected the scenery being consumed in system, and the intellectual mobilized as a consumer without consciousness about a purpose.
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