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한영호,서문호,남문현 건국대학교 산업기술연구원 2006 건국기술연구논문지 Vol.31 No.-
The Automatic Striking Clepsydra Jagyeongnoo installed in the Time Announcing Pavilion Borugak was the first clockwork with time announcing mechanisms in Korea. In June of 1432 King Sejong ordered Jang Yeong-sil make a timekeeping apparatus, whose wooden figurines announce time signals automatically without human intervention. On July 1, 1434 Jagyeongnoo began to function as the Royal Court standard timekeeper. Among numerous parts only clepsydra vessels have survived up to the present and nothing of the time announcing mechanisms remains nowadays. The authors of this paper had recently reconstructed the whole system of Jagyeongnoo, including the time announcing mechanisms as well. The mechanical and functional details of the time-telling apparatus were described in this paper. The characteristic aspects of Jang's ingenious devices, such as float-rod and ball-rack mechanism, ball-relay mechanism, and twelve double-hour announcing mechanism, were evaluated at the viewpoint of history of technology.
南文鉉,韓永浩,李秀雄,梁必承 건국대학교 1995 學術誌 Vol.39 No.1
Armillary spheres called honchonui is to show that during the Chosen dynasty (1392∼ 1910), Korean astronomy and technology went on its own path distinctive not only from that of the West but also from that of China, both of which had great influences on it. Our study is based upon the research of written materials and the physical investigation of some existing instruments; its findings will be used for our reconstruction of armillary spheres that were made during the middle of the dynasty. During the Choson, armillary spheres were developed to facilitate the propagation of Confucian ideology, on the one hand, to improve the knowledge of astronomy, on the other. Recognizing their importance at both aspects, the kings devoted themselves to toe making and repairing of the instruments. As time went, individuals outside of the court began to participate in making them. During the middle of the dynasty, that it from the Japanese invasion to the end of King Yongjo's rule, the Korean scientists incorporated the knowledge from the West in the making of armillary spheres. The period of King Hyonjong's reign witnessed a real innovation in making of armillary clocks. Two important scholar-officials played a major role in the renaissance of Korean technology. Upon the king's order, Yi Minch'ol cast new armillary spheres with a water-operated mechanism ; Song Iyong was also ordered to make a "self-sounding clock", that it a weight-driven armillary clock which was affected by the import of a western-style clock through China and Japan. Their joint efforts indeed led to a breakthrough not only in the history of Korean technology but also in that of mankinds. In this way, they succeeded in making armillary spheres in their own way beyond both Chinese and Western traditions of horological instrumentation. To be sure, the reconstruction of armillary spheres for which this study is to lay foundation will further stimulate the efforts at illustrating the history of Korean technology.
서문호,한영호,남문현 건국대학교 산업기술연구원 2006 건국기술연구논문지 Vol.31 No.-
The most distinctive feature of Jagyeongnoo is its simple and secure mechanisms devised for automatic audio-visual time announcing system. The Veritable Records Sejong Sillok suggested that special emphasis had been put upon signaling subdivided night-watches with mechanical logic operator. In this paper, the details of the night-watch signalling mechanism was described at full length. Through the recent reconstruction of the whole system of Jagyeongnoo which has been missing for several hundred years, the authors could discover the real ingenuity of Jang Yeong-sil displayed on the first Korean mechanical clockwork.
김성균,이재효,한영호,남문현 건국대학교 산업기술연구원 2006 건국기술연구논문지 Vol.31 No.-
This is the second part of the paper series about Jagyeungnoo, 'The Self Time Announcing Clepsydra', restoration project. The content of the second part is about the constant flow rate keeping system to the time measuring vessels. This system consists of three vessels. They are reservoir, compensating, and regulating vessels. In Jagyeungnoo system overflow mechanism was adopted to achieve constant flow rate regardless inflow rate variations. Through extensive parametric and experimental study based on extensive trial-error based on the mathematical model, optimal values of two parameters, i.e, initial height of regulating vessel and the diameter of the pipe exit orifice were determined and discussed improving method of accuracy. For the application of this result to Jagyeungnoo system, the eleven 24 solar seasonal time-ruler and its floating accessories were restored based upon Nujutongui, i.e. Clepsydra Operation Manual published in King Sejong's era.