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이건원(Lee, Gunwon),정윤남(Jeong, Yunnam),지성균(Ji, Seongkyun),김세용(Kim, Seiyong) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.2
본 연구는 여러 분야에서 널리 활용되고 있는 생태면적률 제도 보완을 목적으로 한다. 최근 도시농업에 대한 수요가 증가하고 있는 추세이며, 많은 공동주택단지에서 주민들이 텃밭을 일구고 있지만 이에 대한 건축 및 도시계획적 대응 은 부족한 상황이다. 이러한 점에서 본 연구는 이미 널리 활용 중인 생태면적률 제도를 활용하여, 이러한 도시농업에 대한 수요 에 대응하는 것이 효과적이라고 생각한다. 다만, 생태면적률 제도는 작물이 아닌 초목 만을 고려한 것으로 작물재배를 위해서 는 한계가 분명하다. 이러한 점에서 본 연구는 생태면적률 제도를 보다 확장하여 작물생장 성능까지 담을 수 있는 방안을 모색하고자 했다. 이를 위해서 기존의 생태면적률의 요소에 일조, 간격, 면적, 토심이라는 요소를 더 추가하여 생태면적률의 보완가능성을 분석했다. 본 연구는 기존의 생태면적률 제도를 보완하여 최근의 도시농업의 수요에 대응할 수 있는 방안을 제안했다는 점에서 의미를 지닌다 The purpose of this study is to improve Biotope Area Ratio(BAR) systems used in the various fields. Recently, there has been increasing demand in urban agriculture as well as more residents cultivating farms on a small scale. However, there are few measures in terms of architecture and urban planning to respond to this trend. In this sense, this research is effective as it can respond to these demands by using BAR systems. Yet, the environmental indexes are not enough since BAR systems only take account of vegetation. Therefore, this study proposes an alternative way that includes the capacity factor of the plant growth by expanding the existing BAR systems. Thus, the study analyzes the complementary possibility of BAR systems, including elements of daylight, planting interval, area and soil depth with existing BAR elements.
이재선(Jae-Seon Lee),최순(Suhn-Choi),김지호(Ji-Ho Kim),박근배(Keun-Bae Park),지성균(Sung-Quun Zee) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.6
Deep groove ball bearing is installed in a control element of an integral nuclear reactor, where water is used as coolant and lubricant. This bearing is made of STS440C stainless steel for the raceways and the balls to use in radioactive environment and water. It is known that the retainer design affects ball bearing operability and endurance life, however there is no verified retainer design and material for water lubricated ball bearing. Four kinds of retainers are manufactured for the endurance test of water lubricated deep groove ball bearing. Three of them are commercially developed types and the other is designed for this research. It is verified that ball bearings with steel pressed and general plastic retainer can not survive to required life in the water, however bearings with machined type and cylinder type retainer can survive. This proves that one of the major design parameters for water lubricated ball bearing is retainer type and material. In this paper, experimental research of endurance test for water-lubricated ball bearing are reported.
이재선(Jae-Seon Lee),김종인(Jong-In Kim),김지호(Ji-Ho Kim),박홍윤(Hong-Yune Park),지성균(Sung-Qunn Zee) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.37 No.-
Water-lubricated frictional characteristics of stainless steel ball bearing is not well known compared to oil-lubricated frictional characteristics. Furthermore study on friction at high temperature is rare because bearing maintenance strategy for water-lubricated or chemicals-lubricated bearings of equipment is mostly based on change of failed bearings and parts. Ball bearings and ball screw are installed on the power transmission for a developing integral reactor and these are lubricated with high temperature and high pressure chemically-controlled pure water. Bearings and power transmitting mechanical elements for an atomic reactor needs high reliability and high performance during estimated lifetime, and it should be verified. In this paper, experimental research results of frictional characteristics of water-lubricated ball bearing as a preliminary investigation.