• Magazine of the Korean Society of Agricultural Engineers
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• v.13 no.1
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• pp.2206-2217
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• 1971

Spillway and discharge channel of reservoirs require the Control of Large volume of water under high pressure. The energies at the downstream end of spillway or discharge channel are tremendous. Therefore, Some means of expending the energy of the high-velocity flow is required to prevent scour of the riverbed, minimize erosion, and prevent undermining structures or dam it self. This may be accomplished by Constructing an energy dissipator at the downstream end of spillway or discharge channel disigned to dissipated the excessive energy and establish safe flow Condition in the outlet channel. There are many types of energy dissipators, stilling basins are the most familar energy dissipator. In the stilling basin, most energies are dissipated by hydraulic jump. stilling basins have some length to cover hydraulic jump length. So stilling basins require much concrete works and high construction cost. Flip bucket type energy dissipators require less construction cost. If the streambed is composed of firm rock and it is certain that the scour will not progress upstream to the extent that the safety of the structure might be endangered, flip backet type energy dissipators are the most recommendable one. Following items are tested and studied with bucket radius, $R=7h_2$,(medium of $4h_2{\geqq}R{\geqq}10h_2$). 1. Allowable upstream channel slop of bucket. 2. Adequate bucket lip angle for good performance of flip bucket. Also followings are reviwed. 1. Scour by jet flow. 2. Negative pressure distribution and air movement below nappe flow. From the test and study, following results were obtained. 1. Upstream channel slope of bucket (S=H/L) should be 0.25<H/L<0.75 for good performance of flip bucket. 2. Adequated lip angle $30^{\circ}{\sim}40^{\circ}$ are more reliable than $20^{\circ}{\sim}30^{\circ}$ for the safety of structures.

• The Journal of Korean Philosophical History
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• no.31
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• pp.241-262
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• 2011

In this paper we show how the perception of heavenly principle(天理) and definition of individual desires(私慾) in the five commentaries on Daodejing(道德經) was changed over time. The five commentaries on Daodejing(道德經) composed during $Chos{\breve{o}}n$ are 'Sooneon(醇言) by Lee, Yul-gock (李珥,1536~1584), 'SinJoo-DoDuckKyung (新註道德經) - or New Commentary on Daodejing(道德經) - by Park, Se-dang(朴世堂,1629~1703), 'Dodukjigi(道德指歸)' by Suh, Myoung-euing(徐命膺,1716~1787), 'Chowondamro (椒園談老)' by Lee, Chung-ik(李忠翊,1744~1816), and 'Jungro(訂老)' by Hong, Suk-joo (洪奭周,1774~1842). The course of history in understanding the book, "Daodejing(道德經)," demonstrated that by the late of $Chos{\breve{o}}n$ Dynasty in the 18th century, the notion of 'the moral law for the community' has changed. Neither Suh, Myoung-euing nor Lee, Chung-ik emphasized 'the necessity for the truth of the heavens.'Instead, they focused more on the 'individuals' who followed the moral law than the moral law itself. They did not see the individual desire as the object that had to be discarded. Within the context of this framework, the individual's role had changed from the person who had to be obedient to the law to the subject who judged the moral law all by him/herself. This process of breaking up 'the goodness of the community' led the $Chos{\breve{o}}n$ Dynasty of the 18th century in the transition period to the modern era. In other words, it was the time when the introspection of the 'moral law' prevailed in the $Chos{\breve{o}}n$ Dynasty occurred naturally and spontaneously among the Confucian scholars, which implied the reconceptualization of the 'self-awareness' or 'the point of view on the individual's self-desire' was occurred in the context of academic development during the late $Chos{\breve{o}}n$ Dynasty.

• Archives of design research
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• v.17 no.4
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• pp.15-26
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• 2004

After 19th century of Chosun Dynasty Gilsnagmunja-do such as longevity, good fortune, health, well-being which was explosively prevalent and Hyojemunja-do which was panoramically decorated with eight characters of filial piety, fraternal devotion, loyalty, trust, courtesy, commitment, integrity and humility for enlightment of the public under the name of political ideology are consistency or same origin in traditional concept of Orient. Therefore, in view of Western standard, they are showing an illustration and a photograph of characters in design. There are some differences in way of expressions. They were considerably popular not only in Chosun Dynasty but in China, Japan and Vietnam where belong to the cultural territory of chinese characters. Though, Hyojemunja-do which was built-up in the late period of Chosun Dynasty and developed fro chinese mode is a very peculiar iconography and mode of Chosun Dynasty. Hyojemunja-do is also classified from Chinese Nianhua designed for supply of Conficianism ethics or Folk Painting designed for practical use in chinese cultural territory. In the late period of 19th century, Hyojemunja-do which was re-built with creative modeling has been developed in peculiar mode in the province of Kyunggi, Kangwon(Kwan dong region), Kwanseo region, Jeju island and Namdo region by the diversified level of painters.