http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
재하상태에서 보강된 철근 콘크리트보의 보강 재료에 따른 구조적 거동
정란,이영재,문희증,이경언,정상진,Chung, Lan,Lee, Young-Jea,Moon, Heui-Jeung,Lee, Kyung-Un,Jung, Sang-Jin 한국콘크리트학회 1999 콘크리트학회지 Vol.11 No.1
철근콘크리트 구조물은 과도한 하중과 유지관리의 소홀 등 여러 가지 이유로 보수${\cdot}$보강을 필요로 하는 경우가 많다. 이에 대해 국내에서는 철근콘크리트구조체의 보강방법으로 강판, 탄소섬유쉬트, 탄소섬유판을 사용하고 있다. 그러나 이들 보강재료의 성능에 대하여 신뢰할 만한 연구 결과가 아직까지 충분치 않은 실정이다. 본 연구는 보강재의 종류, 균열폭, 하중의 재하상태를 변수로 보강된 철근콘크리트보의 거동을 규명하고자 하였다. 보수시험체의 경우 기준시험체와 내력과 연성은 비슷한 거동을 나타냈으나 파괴형상은 인장부위 콘크리트의 탈락과 지압파괴가 발생하였다. 보강시험체의 경우, 보강의 효과는 뚜렷이 나타났으나 보강재의 물성을 100% 발휘하지는 못하였다. 탄소섬유쉬트의 경우 접착제의 성능이 완벽하지 않아 최대 내격시의 변형률이 파단시의 변형률과 비교하여 66%정도로 나타났다. 또한 보강시의 균열폭과 하중의 유${\cdot}$무는 부재의 내력과 거동에 영향을 거의 미치지 않는 것으로 나타났다. In recent years, strengthening by steel plate, carbon fiber sheets, and carbon fiber laminate is spotlighted in order to repair and rehabilitation of R/C structures. In this study, 3 methods of rehabilitation technique were analyzed from the test results. Test parameters were the width of cracks, the method of repair and rehabilitation, the magnitude of pre-load. Deflections, failure loads, strains of reinforcing bar, strains of carbon fiber sheet, carbon fiber laminate and steel plate were measured during the tests. The primary purpose of this research was to analyze the failure mode and structural behavior of strengthened RC beams with/without superimposed pre-load. Test results should that no significant difference was observed between with pre-loaded specimens and no-loaded specimens during rehabilitation.
객체 모델의 프로토타이핑을 위한 명세 및 시뮬레이션 환경
정란(Jung Lan),김정아(Kim Jung A),문충렬(Moon Chung Ryeal),김정두(Kim Jung Doo) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.5
Object modeling has been considered as an efficient technique for eliciting user requirements and communicating between developers and customers. But model itself is not easy to understand what result will be after coding and whether it will be meet with the requirements of customers. In this paper, we developed the environment for visualization of object model for validating with requirement at the early stage. Therefore, we defined correct and complete rules which can transform the object model, the deliverables of Shlaer/Mellor''s method, into a formal specification language of VDM(Vienna Development Methods) with a mathematical basis. This basis provides the means of providing that a specification is realizable and proving properties of a system. Therefore, the completeness, preciseness of object model can be verified by proving the transformed VDM specification and prototyping by constructing a visualization supporting environment.
철근이 부식된 철근콘크리트 슬래브의 구조성능 평가에 대한 실험적 연구
정은철 ( Jung¸ Eun-chul ),이경언 ( Lee¸ Kyoung-un ),정란 ( Chung¸ Lan ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
With the exhaustion of river aggregate which have been used as main resource of aggregate, sea sand have been used. However sea sand without removal of salt cause corrosion of embedded. This study is aimed at providing the data for basic design data of corroded reinforced concrete by testing various corrosion level over 5% specimens.
노정태 ( Noh Jung-tae ),이상현 ( Lee Sang-hyun ),정란 ( Chung Lan ),김사덕 ( Kim Sa-dug ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
In Korea, a number of stone pagoda have been constructed and developed into diverse style due to abundant stone resource in Korean peninsular since AD 392, the introduction of buddhism. However, stone pagodas have been standing outdoor for over thousands of years so that serious damages have resulted from natural and artificial causes despite of high strength and durability of stone materials. Thus, in this study, a variety of damage patterns and risk of existing stone pagodas are investigated and analyzed considering a diversity of risk factor to the stone pagoda as a basic research for development of damage mitigation technologies.
노정태 ( Noh Jung-tae ),이상현 ( Lee Sang-hyun ),정란 ( Chung Lan ),김호수 ( Kim Ho-soo ),신효범 ( Shin Hyo-bum ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
In this study, the structural stability of stone pagoda in Korea is evaluated with regard to the interior compaction of the stereobate with 2 and 3-dimension modeling using distinct element method. The stereobate is crucial to stability of the stone pagoda in respect that its interior condition determines the distribution of the vertical load of the upper stone blocks. The distinct element model of the existing stone pagoda is used for investigating structural stability and performance of the retrofitting the stereobate with the core-stone is verified. The result indicates that corestones play a significant role in distributing the vertical load from the stone pagoda to the ground and improving the structural stability.
노정태(Noh Jung-Tae),김학진(Kim Hack-Jin),이상현(Lee Sang-Hyun),정란(Chung Lan),김호수(Kim Ho-Soo),신효범(Shin Hyo-Bum),홍석일(Hong Seok-Il) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.12
This paper focused on the evaluation of static safety according to stereo form in the stone pagoda which is one of the main cultural heritages in Korea. Frist, the damage types and present reinforce conditions of stereobate in the stone pagoda were surveyed. And then Sun-san Jukjang-dong 5-story stone pagoda was selected as a sample model for constructing analytical model of stone pagoda since its measured drawing had been made. The stress distribution and reactions of the upper-capstone(Sangdaigopsuk) in the stereobate were obtained by using finite element model analysis, and it was identified that core-stone plays a role of distributing the stress of the upper-capstone and about 1mm of settlement prevents the inner stuffing to support the upper-capstone. Also, 3-D modelling of the entire stone pagoda was conducted by 3DEC program using a discrete element model, and the stress distribution and displacement of all the members were obtained. The analyses results indicated that the existence of the core-stone and the condition of core-stone arrangement reduced the value of the maximum stress and displacement by transferring the self-weight mainly to the core-stone.
Oral Administration of Camelina Oil Effects on Body Weight and Serum Lipid of Mice
Yong Suk Chung(정용석),Jung Ran Choi(최정란),Sanghyeob Lee(이상협) 한국생물공학회 2019 KSBB Journal Vol.34 No.1
The seed of Camelina sativa is emerging as a good source of α-linolenic acid with enhanced vitamin E content. Therefore, we investigated health beneficial effects of camelina oil for utilization of food ingredient. In this study, we administrated orally camelina oil with normal (ND) and high-fat diet (HFD) feeing on mice and analyzed their effects on lower body weight gain, serum lipid profiling including total cholesterol (TC), triglyceride (TG), high-density lipoprotein (HLD), and low-density lipoprotein (LDL). In ND feeding mice, oral administration of camelina oil showed significantly lower body weight gain after two weeks compare to lack of camelina oil supplement, although the effect of body weight gain was not shown in HFD feeding mice. Camelina oil also effects on lipid profiles of mice serum. The levels of TC were significantly decreased by the camelina oil supplementation in ND feeding mice. These results suggested that camelina oil supplementation with moderate-fat consumption might have health benefits in body weight control and blood lipid profiles.