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金倫杰 群山敎育大學 1973 論文集 Vol.6 No.-
Holography is a kind of photographing method which re-projects the wave surface and reveals the images of the objects. First, we reflect the objects with the coherent monocromatic light, and record the diffraction image on the dry plate, then develope it. We call this operated dry plate Hologram. The quite different results from the first are recorded on this dry plate and it results that the informed objects are accumulated the diffraction images on the surface of the dry plate. Second, we can get the images of the first objects reprojecting the wave surface from the recorded dry plate. The method of reprojecting is as follows ; if we reflect the first monocromatic light on the recorded dry plate, the wave surface which pass through the Hologram is shown the same one we reflect the objects directly. That's the way of reprojecting the real images. Consequently we call it Fraunhofer-hologram if the Fraunhofer diffraction image is to be recorded on the photographic dry plate, while we call it Fresnel-hologram if the Fresnel hologram image is to be recorded on it. In 1948 Gober, the English scientist, found out the method first out of the new experiment of microscope. In 1962 Leith, Upatnieks of America made remarkable progress using the Laser light. We expect this principle to be applied to the optics fields, such as measuring techniques, information-treatment-skills, high-speed photographic techniques, skills for interference spectroscopy, and microscope etc. In this paper I intended to express my opinions on the principle, kinds, reality and application of holography.
김윤기(Yun-Ki Kim),반영훈(Yeong-Hun Ban),임형택(Hyung-Taek Lim),이동언(Dong-Eon Lee),이진규(Jin-Kyu Lee),김성걸(Seong Keol Kim) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.1
The three-wheel pitching machine is a device that throws balls automatically instead of a pitcher and is used chiefly to train baseball players. The machine is abundantly used by people in indoor baseball grounds for baseball games. However, in Korea, foreign products are more popular because the efficiency of domestic products is poor as compared to that of the foreign ones. Therefore, a miniature pitching machine was manufactured to analyze and solve the problems of the existing machine. We added a feeder device to insert the balls in the machine and developed a smart phone application. The machine is easily controlled by a smart phone with bluetooth. While manufacturing the miniature, the existing problems were mitigated and the machine was redesigned for mass production. This study attempted to render the pitching machine more convenient and safer as a substitute for foreign pitching machines.
Choi, Yun-Wang,Oh, Sung-Rok,Choi, Byung-Keol Hindawi Publishing Corporation 2017 Advances In Materials Science And Engineering Vol.2017 No.1
<P>We fabricated crack self-healing capsules using cement powder for mixing into cement composites and evaluated the properties of the capsule manufacturing process in this study. The manufacture of the self-healing capsules is divided into core production processing of granulating cement in powder form and a coating process for creating a wall on the surfaces of the granulated cement particles. The produced capsules contain unhardened cement and can be mixed directly with the cement composite materials because they are protected from moisture by the wall material. Therefore, the untreated cement is present in the form of a capsule within the cement composite, and hydration can be induced by moisture penetrating the crack surface in the event of cracking. In the process of granulating the cement, it is important to obtain a suitable consistency through the kneading agent and to maintain the moisture barrier performance of the wall material. We can utilize the results of this study as a basis for advanced self-healing capsule technology for cement composites.</P>