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개선된 인양홀을 이용한 정착장치로 보강된 RC 보의 거동
오민호,김태완,박선규 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 논문집 Vol.14 No.3
RC 구조물의 보강에는 여러 가지 보강공법이 사용되고 있으며 특히 외부강선 보강공법은 손상된 구조물을 보강하는 대표적인 공법이며 효율성, 용이성, 경제성의 면에서도 우수하다. 본 연구에서는 PSC 및 RC 거더에서 추가 손상 없이 충분한 보강효과를 얻을 수 있는 보강공법으로써 개선된 인양홀을 이용한 정착장치를 제안하였다. 2가지 유형의 새롭게 제안된 정착장치를 6개의 실험체의 적용하였고 기존의 정착장치를 3개의 실험체에 적용하였다. 한 개의 실험체는 보강효율을 판단하기 위하여 보강공법을 적용하지 않았다. 이들 정착장치의 거동을 분석하기 위하여 정적 재하 시험을 수행하였고 실험변수들은 정착장치의 형상, 강봉의 긴장정도와 강선의 설치형태이다. 각 실험체의 보강 효과를 조사하기 위해 처짐, 변형률 그리고 파괴양상을 기록하였으며 균열하중, 항복하중, 극한하중, 연성지수 그리고 강선의 응력을 분석하였다. 그 결과 제안된 인양홀을 이용한 정착장치는 기존의 정착장치보다 높은 보강효율을 보였으며, 에너지 개념을 이용한 연성도 평가에 따르면 충분한 연성을 확보하고 있음을 알 수 있었다. In order to strengthen RC structures, various strengthening methods have been used. Particularly, external tendon strengthening method is very popular method to strengthen damaged structures in terms of efficiency, ease, economics. In this study, improved anchorage elements using the lifting hole were proposed to strengthen PSC or RC girder without any damage. Two types of anchorage elements were proposed and these elements were applied on six RC beams. Also, three types of existing anchorage elements were applied on three RC beams. Otherwise, any anchorage element was not applied on one RC beam to used as a control beam. To analyse behavior of these elements, static load tests were carried out. Test variables were anchorage shapes, prestressing level on the steel bar and tendon profiles. Deflections, strains and modes of failure were recorded to examine the strengthening effects of the beams. Ductility index and tendon stress were analyzed by comparing cracking load, yielding load and ultimate load. As a result, proposed anchorage elements using lifting hole were superior to existing anchorage elements in terms of strengthening effect and furthermore, they showed ductile behavior based on energy method.
레스토랑 선택결정요인에 관한 실증적 연구 : 대구도심지역 한식당 이용고객을 대상으로
오민호,송성인 한국레크리에이션 교육학회 1999 한국여가학회지 Vol.1 No.1
The overall purpose of this study is to provide further insight into the pattern and decision factors of consumers with respect to their restaurants choices, in order to set database for managerial strategy and market segmentation. To accomplish the purpose of this study, two hypothesis were adopted. H1 : There is difference of the factors that determine restaurants choice by demographic variables. H2 : There is difference of the factors that determine restaurants choice by dining-out motives. To test these hypotheses, the questionnaire survey was conducted at the four Korea style restaurants in Tae-gu. The statistics were analyzed by SPSS for window version 7.5. Frequency analysis and crosstabs analysis are employed to identify the underlying demographic attributes. Factor analysis is used to understand the factors that determine restaurants choice. T-test and one-way ANOVA with Dunnett multiple range test are employed to identify the difference of the factors that determine restaurants choice by demographic variables and dining-out motives. The results of this present study show that the food taste appear to be the most important standard of restaurant choice, Korea style restaurants customer's are influenced by word of mouth, promoting. This study should be considered more since the sample was not completely random and it was confined to one area the city of Tae-gu, so that similar research undertaken in other areas may show different results.
한외 여과법을 이용한 tert butyl phenol 제거에 대한 CPC/NaSal 미셀의 영향
오민호,김원종,양승만 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.1
수용액 내에서 wormlike 미셀(micelle)을 형성시키는 양이온 계면활성제 cetylpyridinium chloride(CPC와 첨가제 sodium salicylate(NaSal)을 투입하여 UF막 표면에 겔층을 형성시킴으로써 TBP와 같은 저분자량 유기 화합물을 효과적으로 제거할 수 있는 미셀을 이용한 한외 여과의 실험적 연구를 수행하였다. 회분식 한외 여과 장치를 사용하여 보유액(retentate)의 농도, 첨가제의 농도 및 계면활성제와 첨가제의 몰농도비 등에 따른 TBP의 제거율을 살펴보았다. 임계 미셀 농도 이상에서 CPC 등의 계면활성제는 TBP등의 유기 용질들을 미셀 안으로 가용화 시키며, 한외 여과막을 이용하여 이러한 용액을 여과하였을 경우 미셀은 분리막에 의해 차단되고 투과된 용액에는 미셀 형성에 참여하지 못한 극히 미량의 계면활성제와 유기 화합물만 존재함을 확인하였다. 여과가 진행되면서 보유액의 CPC 및 첨가제 NaSal의 농도가 증가하면 분리막 근처에 겔층을 형성할 뿐만 아니라 점도가 급격히 상승하기 때문에 플럭스가 매우 빠르게 감소하는 경향을 나타내게 되며, 이러한 효과를 감소시키기 위하여 차단분자량이 20,000인 막을 선택하여 플럭스의 감소를 보정하고, TBP의 제거율은 유지하면서 CPC의 제거율을 보다 향상시켰다. Nasal와 CPC의 비가 0.1인 경우 플럭스는 Nasal가 투입되지 않은 용액과 유사한 값을 나타내었으며, TBP및 CPC의 제거 효율이 97% 이상을 나타냄을 알 수 있었다. In this study, we investigated the effects of gel-layer by wormlike micelle on the removal efficiency of tert-butyl phenol(TBP) from aqueous stream using cationic surfactant cetylpyridinium chloride(CPC) with an additive sodium salicylate (NaSal). When the surfactant was added to the solution at the concentration far above its critical micelle concentration, the surfactant molecules formed micelles, into which organic compounds were dissolved. And then, the micellar solution was forced to pass through an ultrafiltration membrane of which the average pore size was smaller than that of the micelle. To prevent the surfactant and organic compounds from leaking through the membrane, the molecular cut-off(MWCO) 20,000 was selected. The membrane with MWCO of 20,000 gave a very satisfactory removal flux. The added Nasal reduced the concentration of CPC in the permeate and provided the additional resistance on the surface of membrane. Indeed, in the presence of Nasal, CPC micelles containing TBP were rejected more effectively. When the molar ratio of Nasal to CPC was 0.1, the flux showed no appreciable change, compared to that with no Nasal. The rejection efficiency of CPC was maintained above 99%.
철근 콘크리트 보의 강도에 따른 단기 처짐의 실험적 연구
오민호 ( Oh Min-ho ),김태완 ( Kim Tae-wan ),최걸 ( Cui Jie ),윤준호 ( Yoon Jun-ho ),박선규 ( Park Sun-kyu ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
RC structures should be considered not only strength but also serviceability. In this research, four RC beams were fabricated with different concrete strength and was analyzed how this strength affect on deflection. The results of experimental deflection are compared with calculated values, which were from KCI and Eurocode 2.
오민호(Oh, Min ho),최민호(Choi, Min ho),이태동(Lee, Tae Dong) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
Green policies are being implemented globally to respond to climate change throughout the all industries. The AEC industry is also increasingly demanding regional energy management in addition to buildings. In spite of various efforts for energy management in the port area where the logistics industry is in progress, there are many difficulties. We propose an ICT - based energy management system to solve these problems. The proposed system has energy monitoring and energy reduction simulation functions. We expect that the system will be a basis for regional energy management and green policies response.
철근 콘크리트 보의 강도에 따른 단기 처짐의 실험적 연구
오민호(Oh, Min-ho),김태완(Kim, Tae-wan),최걸(Cui, Jie),윤준호(Yoon, Jun-ho),박선규(Park, Sun-kyu) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
RC structures should be considered not only strength but also serviceability. In this research, four RC beams were fabricated with different concrete strength and was analyzed how this strength affect on deflection. The results of experimental deflection are compared with calculated values, which were from KCI and Eurocode 2.