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이재수,Lee, Jae-Su 대한인쇄문화협회 2007 프린팅코리아 Vol.63 No.-
대한인쇄문화협회와 한국이앤엑스는 프린코2007을 기념하여 지난 8월 22일 오후 2시부터 4시까지 코엑스 전시장 특별세미나실에서 세미나를 개최했다. 이날 세미나는 박인섭 B&S Law Firm 개인자산관리연구소장이 '인쇄 경영과 재테크'에 대해, 이재수 동국대산업대학원겸임교수(일진피엠에스 부사장) '인쇄 블루오션 개발' 에 대해 각각 강의했다. 다음은 이재수 교수의 강연 내용이다.
도시형생활주택의 공급현황 및 거주특성 연구 - 서울시 공급사례를 중심으로 -
이재수,성수연,이동훈,Lee, Jae-Su,Seong, Su-Youn,Lee, Dong-Hoon 한국주거학회 2014 한국주거학회 논문집 Vol.25 No.2
This study investigates supply patterns and residential characteristics of the Urban-type Housing in Seoul. There have been 3,336 buildings and 71,790 housing units approved until the end of 2012. One-room apartments and small units less than 30 $m^2$ of residential area amount to 81% and 82% of total units, respectively. Major findings are as follows. First, single- and two-person households less than 30 years of age are mostly lived in the housing. Respondents are mainly professional and white-collar (43%) and service and sales workers (27%). Most of them are mid-income classes (67%), which is twice more than that of single- and two-person households in Seoul. They pay 672 thousand won in rent more than average rent of mid-income class. The rent to income ratios are 29.9% for single households and 24.5% for two-person households, which are higher than that of mid-income bracket. Third, their satisfaction level is relatively high in internal environment and access to public service facilities, but not in external environment and community service facilities. They are satisfied with security and daylight, walking and safety, access to public transport and parking space, but not with noise and vibration, natural environment, access to park and cultural and sports facilities, and most community service facilities. It is necessary to reexamine the articles of deregulation and prepare design standards while considering different housing and locational types.
서울시 2인 가구의 주거실태와 공간적 입지 특성 연구 - GIS를 활용한 다변량 분석 -
이재수,이삼수,Lee, Jae-Su,Lee, Sam-Su 한국주거학회 2013 한국주거학회 논문집 Vol.24 No.5
The goal of this research is to explore quantitative and residential features and spatial patterns of two-person households to suggest policy implications for housing supply and development in Seoul. Major findings of this study are as follows. First, the number of two-person households has increased rapidly mainly due to the growth of the elderly and single-parent households. They are mainly composed of the elderly over 60s and the youth of 30s of householder age. They are less likely to have well-paying jobs, and thus more likely to suffer from poverty. They are also inclined to live in rental and small-sized residential units and spatial segregation between the youth and the elderly became serious. In addition, their residential area can be classified into four types: area adjacent to employment centers, hinterland of urban centers, affordable multi-family housing area and redeveloped apartment area. It is necessary to change the current housing policy directions to take changing population and household structure into consideration. Also, diversified housing strategies and programs should be prepared to consider various household types and their needs and demands. Place-based strategies for housing supply and development are needed in consideration of spatial patterns and locational attributes of two-person households. Attention needs to be paid to resolving the social issue of residential segregation between different generations.
An Analysis of Attenuation Effect of Pressure Head Using an Air Chamber
이재수,윤용남,김중훈,Lee, Jae-Su,Yun, Yong-Nam,Kim, Jung-Hun Korea Water Resources Association 1995 물과 미래(한국수자원학회지) Vol.28 No.5
공기실(air chamber)은 관망에 있어 압력수두가 설계치를 초과하지 않고 또한 최저 압력수두가 발생하지 않도록 하기 위해 설계된다. 따라서 공기실은 갑작스런 펌프의 중단에 따르는 순간적인 최고 및 최저 압력수두의 발생을 방지하기 위해 사용되어 진다. 본 연구에서는 가상적인 관망에 공기실을 적용하여 공기실의 공기부피, 위치, 면적, 오리피스에서의 손실계수 그리고 polytropic지수의 변화에 따른 압력수두의 완화효과를 분석하였다. 분석결과 공기의 부피가 증가할수록 최고압력수두는 감소하고 최저 압력수두는 증가함을 보여주었으며, 공기실의 위치나 단면적의 변화는 완화효과의 변화가 별로 없었다. 또한 오리피스 손실계수를 증가할수록 최고 압력수두가 감소함을 보이고, 공기실의 공기가 등온변화과정을 따를때가 단열변화과정을 따를 때보다 최고 압력수두가 낮음을 보여주었다. An air chamber is designed to keep the pressure from exceeding a predetermined value, or to prevent low pressures and column separation. Therefore, it can be used to protect against rapid transients in a pipe system following abrupt pump stoppage. In this research, an air chamber was applied to a hypothetical pipe system to analyze attenuation effect of pressure head for different air volumes, locations, chamber areas, coefficients of orifice loss and polytropic exponents. With an increase of air volume, the maximum pressure head at pump site is decreased and the minimum pressure head is increased. For different locations and areas of the chamber, the attenuation effects do not show much difference. Also, as the orifice loss coefficient increases, the maximum pressure head is decreased. For different polytropic exponents, isothermal process shows lower maximum pressure head than that of the adiabatic process.