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임제순,이경준,조영석,Lim, Je-Soon,Lee, Kyeong-Jun,Cho, Young-Seuk 한국데이터정보과학회 2010 한국데이터정보과학회지 Vol.21 No.6
데이터마이닝 분야에서 연관성분석은 가장 많이 사용되고 있는 기법으로 데이터 내에 포함되어 있는 특정 항목들의 연관성을 수치화시켜 나타내는 방법이다. 기본적으로 연관성규칙은 지지도, 신뢰도, 향상도를 계산하여 연관성의 유무를 판단한다. 기존에 제시된 관련 논문에서는 관심변수의 발생유무만을 바탕으로 연관성규칙을 이용하였고, 빈번하지 않은 데이터에 대한 문제점과 순위결정함수를 통한 해결방안을 제시하였다. 하지만 실제 데이터에서는 발생이 빈번하지 않은 데이터 뿐 아니라, 발생이 많이 일어나는 데이터도 존재한다. 따라서 발생빈도를 고려한 연관성규칙이 필요하다고 생각한다. 본 논문에서는 각 케이스 내의 발생빈도를 고려한 새로운 연관성 측정 도구를 제시하였다. 또한 실제 예제를 통하여 기존의 연관성규칙과 새로운 연관성규칙의 결과를 비교해 보았다. 그 결과, 새로 제시한 연관성규칙이 기존의 연관성규칙보다 더 세밀하게 구분하는 것을 확인할 수 있었다. In data mining, association rule is a popular and well researched method for discovering interesting relations between variables. There are three measures for association rule, support, confidence and lift. But there are some problem in them. They don't consider the frequency of variable in case. So, we need the new association rule which consider the frequency.In this paper, we proposed the new association rule. We compared the proposed association rule with the original association rule from example data. As a result, we knew our function was better than the original function in terms of sensitivity.
임제순(Je Soon Lim),유석균(Sukkyun Ryu),전영기(Young Ki Jeon) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.11
Yangyang Hydro Power Plant is equipped with the two-stage hydraulic turbine in huge capacity in the first time in Korea. It is different from any other hydraulic power plants in that two turbines are installed in just one shaft. While we are operating hydraulic turbine since the construction of our plant, we find broken bolts on thrust bearing pad, which causes much trouble in succeeding operation. But by adopting sequence change, we could solve a and maintenance time, placing confidence in quality. Therefore, this paper provides a solution that the radial force applied to the pad is equal to the vertical load applied on each pad time friction coefficient. Under the worsening condition the difference of temperature in operation and stand still condition which can reach 50C, The thrust runner block contraction is about 1.2mm on diameter, so, The injection system will be kept in operation, or put in operation few minutes with a quarter hour interval up to complete cooling of the thrust bearing.
임제순(Jesoon Lim),유석균(Sukkyun Yoo),전영기(Youngki Jeon) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.11
This paper is to show how to solve the problem about thrust of small hydro power plants. While we operate small hydro power plants, bearings and mechanical seals have been damaged several times because of the 1st thrust caused by water flowing in between Runner and Head Cover Wearing Ring and the 2nd thrust caused by water passing Runner. This causes a lot of troubles in succeeding assembly including delay of operation. So, to solve these problems above, We added Runner Balancing Hole for preventing thrust and did piping work, which helped decrease the number of occurrence of thrust. Moreover, to prevent the arrangement from breaking down by over-vacuum of Spiral Casing and to stop Runner blade cavitation, we took an effort for the facilities to run smoothly by installing valve for controlling vacuum.