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이학수 ( Hack Soo LEE ) 대구가톨릭대학교 사회과학연구소 2007 사회과학논총 Vol.6 No.-
Theory building on public planning was beginned to do in the end of the 19th century, but the experiences and practices about it were beginned that human beings with power and authority governs their groups, community and society. But public planning`s researches were developed in the beginning of the 20th century, and later they were accelerated by the public policies studies in 1960`s and the practices on new public management in 1990`s. According to the appearance of new public management, the new objects, techniques and categories of public planning were being studied actively. And the method of this study is used mainly the literature survey, content analysis and comparative approaches. The scope and system are composed of 3 parts. The first part is the general discussions about theoretical building of public planning. It is analyzed to the positions and categories of public planning from 1990`s to the period of new public management in the second part. The implementing strategies of public planning is examined by empirical data in the third part. Ultimately the findings in this study are as follows. We find the methodologies, theories and cases about the categories and implementing strategies of public planning in the times of new public management by this study.
구형단면의 가새부재를 이용한 철근콘크리트 건물의 보강법
이학수(Hack Soo Lee) 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.2
Use of steel bracing system to provide additional strength and stiffness to existing structures, especially those of reinforced concrete, is a relatively new concept. Little information is available on the behavior of frame-bracing systems and on rational procedures for the design of added bracing. Thus, a one-bay two-story two-thirds scale reinforced concrete frame with an added steel bracing system was tested under reversed cyclic deformations. The bracing system consisted of ductile braces in an inverted V-pattern, and horizontal and vertical members(collectors). The strengthened frame showed excellent hysteretic behavior under a large number of cyclic deformations up to 3% of story drift. The hysteresis loops of the strengthened frame were very $quot;full$quot; and stable with a dramatic increase in energy dissipation capacity. An analysis of story shear forces showed that a significant portion of added strength was provided by the steel collectors in addition to that provided by the braces.
재령 및 배합특성을 고려한 보통 콘크리트의 강도, 염화물 확산계수, 통과전하량 변화 분석
이학수(Hack-Soo Lee),권성준(Seung-Jun Kwon) 한국건설순환자원학회 2017 한국건설순환자원학회 논문집 Vol.5 No.1
초기재령에서의 콘크리트 거동은 시간의 증가에 따른 수화반응에 따라 변화하는데, 염해 저항성과 강도 특성은 다르게 변화한다. 본 연구에서는 재령이 28일에서 6개월로 증가하면서 변화하는 강도 및 염해 저항특성을 보통 콘크리트에 대하여 분석하였다. 이를 위해 3개의 물-시멘트비를 가진 일반 콘크리트에 대하여, 재령 28일과 6개월 수중양생을 수행하였으며, 강도, 염화물확산계수, 통과전하량을 평가하였다. 재령이 28일에서 6개월로 증가하면서 강도변화는 135.3∼138.3% 수준으로 증가하였으나, 염화물 확산계수의 경우 41.8%∼51.1% 수준으로, 통과전하량의 경우 53.6%∼70.0% 수준으로 감소하였다. 염화물 확산계수와 통과전하량의 경우는 비교적 비슷한 수준으로 감소하였는데, 두 결과는 전기장 내에서의 염화물 이동에 지배적이기 때문이다. 또한 강도의 변화비보다 염화물 확산계수 및 통과전하량의 변화비가 크게 증가하였는데, 이는 공극특성의 제곱에 비례하여 물질이동 특성이 변하기 때문이다. Concrete behavior in early-age is changing due to hydration reaction with time, and a resistance to chloride attack and strength development are different characterized. In the present work, changing strength and resistance to chloride attack are evaluated with ages from 28 days to 6 months. For the purpose, strength, diffusion coefficient, and passed charge are evaluated for normal concrete with 3 different mix proportions considering 28-day and 6-month curing conditions. With increasing concrete age, the changing ratio of strength falls on the level of 135.3~138.3%, while diffusion coefficient and passed charge shows 41.8%~51.1% and 53.6%~70.0%, respectively. The results of chloride diffusion coefficient and passed charge show relatively similar changing ratios since they are much dependent on the chloride migration velocity in electrical field. The changing ratios in chloride behaviors are evaluated to be much larger than those in compressive strength since the ion transport mechanism is proportional to not porosity but square of porosity.