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최영화,김이성,박강근,Choi, Young-Wha,Kim, Ie-Sung,Park, Kang-Geun 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.4
콘크리트의 사용은 건축 및 토목분야에서 널리 사용되어 왔으며, 센서는 콘크리트에 기능적 특성을 위해 사용되어 왔다. 손상을 스스로 나타내는 콘크리트는 이미 개발되고 있는 중에 있다. 본 연구에서 온도보상센서는 금속의 선형팽창과 체적변형을 이용한 센서이다. LED는 광센서로 고휘도이며, 이들 센서의 가격은 저가격이다. 화재하중으로 인하여 콘크리트 보의 온도보상센서가 동작하는 동안 지상 보의 LED동작으로 콘크리트 부재의 온도상승을 예측한다. 본 연구에서는 부재의 손상감지를 위해 간단한 계측방법을 이용하여 화재자현을 스스로 나타내는 콘크리트 보를 개발하기 위한 기초적 연구이다. Use of concrete has undoubtedly become widespread in construction and civil engineering. Sensors are used to add functional characteristics to concrete. Self-diagnosis concrete is also being developed. The thermal protector used in the study is a sensor using the linear expansion and cubical expansion of metal. The LED(Light Emitting Diode) is a phototransistor type, and to secure high-sensitivity light, the prices of these sensors are low. Rising temperatures of concrete elements can be predicted from LED of the external virtual beam due to operation of thermal protector sensors of concrete beam caused by fire load on the concrete specimen. In this study, the development of fire-diagnosis concrete using composite sensors are the fundamental study for damage detection using simply measurements.
최영화(Young-Wha Choi),김종인(Jong-In Kim),김인수(In-Soo Kim) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.2
An artificial neural network is applied to the prediction of compressive strength, slump value of concrete. Standard mixed tables arc trained and estimated, and the results are compared with those of experiments. To consider the varieties of material properties, the standard mixed tables of two companies of Ready Mixed Concrete are used. And they are trained with the neural network. In this paper, standard back propagation net work is used. For the arrangement on the approval of prediction of compressive strength and slump value, the standard compressive strength of 210, 240kgf/㎠ and target slump value of 12, 15㎝ are used because the amount of production of that range arc the most at ordinary companies. In results, in the prediction of compressive strength and slump value, the predicted values are converged well to those of standard mixed tables at the target error of 0.10, 0.05, 0.001 regardless of two companies.<br/>
고로슬래그를 사용한 고강도 부순모래 경화콘크리트의 물성에 관한 실험적 연구
최영화 ( Young-wha Choi ),김종인 ( Jong-in Kim ) 한국산업융합학회 2005 한국산업융합학회 논문집 Vol.8 No.3
The purpose of this study is to develop the high strength crushed sand concrete in conditions of water binder ratios of 25, 30, 35% and blast-furnace slag substitutions of 0, 15, 30, 45%. Additionally, in case of water binder ratio of 30%, the maximum size of coarse aggregate is two kinds of 13, 19 mm. The conclusions of this study are as follows ; 1. The compressive strength appeared lower in early age as compared with that of plain concrete according to increasing of the blast-furnace slag substitution. But, the compressive strength was respectively 5, 6, 10% larger than that of plain concrete in case of 25, 30, 35% water binder ratios, 28 days, 30% blast-furnace slag substitution and 19mm coarse aggregate. 2. According to increasing of the blast-furnace slag substitution, the modulus of elasticity and the tensile strength of concrete increased. 3. The length change by the shrinkage increased when the larger coarse aggregate was used, and decreased according to higher blast-furnace slag substitution.
김정은 ( Jeong Eun Kim ),견진옥 ( Jin Ok Kyun ),진선민 ( Sun Min Jin ),이영희 ( Young Hee Lee ),김주희 ( Joo Hee Kim ),이현영 ( Hyun Young Lee ),박해심 ( Hae Sim Park ),최영화 ( Young Wha Choi ),예영민 ( Young Min Ye ) 대한천식알레르기학회 2010 천식 및 알레르기 Vol.30 No.3
Background: There have been few reports on the characteristics of adverse drug reactions (ADRs) in elderly patients among the Korean population. Objective: To investigate the characteristics of ADRs in elderly patients compared with those in younger ones. Method: ADRs were collected from a spontaneous reporting system at our university hospital in 2008. Characteristics including underlying diseases, duration of hospitalization, clinical manifestations, culprit drugs and number of concomitant medications were compared between the young (<65 years) and elderly (≥65 years) groups. Result: A total of 528 ADRs occurred in 513 patients, and 120 ADRs (22.7%) occurred in 116 elderly patients. Their mean age was 71.6 years. Antibiotics (45.8%) were the most common culprit drugs. The prevalence of ADRs due to cardiovascular drugs was significantly higher in the elderly group (9.2%) than in the young group (2.9%, P=0.003). The most prevalent clinical types were skin manifestations (40.5%), gastrointestinal abnormalities (28.4%) and systemic reactions (23.5%) in both groups. Renal function abnormalities were significantly more prevalent in the elderly group (4.2%) than in the young group (0.5%, P=0.008). The mean number of concomitant medications was significantly higher in the elderly group (6.5±4.6) than in the young group (1.9±3.9). Conclusion: For the early detection of ADRs in elderly patients, close monitoring of cardiovascular drug use and renal function are recommended. (Korean J Asthma Allergy Clin Immunol 2010;30:216-221)
박강근,김용태,최영화,Park, Kang-Geun,Kim, Yong-Tae,Choi, Young-Wha 한국공간구조학회 2006 한국공간구조학회지 Vol.6 No.1
공동주택의 바닥 슬래브의 합리적인 진동평가를 위하여 보다 정확한 진동해석이 수행되어야 하므로 바닥 슬래브의 시공방법 및 재료에 따라서 상세하게 모델화하여야 한다. 실제 바닥 슬래브의 수치해석에 있어서 매우 상세하게 모델화하여 진동해석을 수행하는 것은 현실적으로 어려우므로 이에 대한 대안으로 본 논문에서 공동주택의 표준바닥 슬래브에 대한 보다 합리적인 수치해석 방법을 제안하였다. In these days the floor vibration is beginning to make its appearance of the environmental dispute in dwelling building. Standard floor system are suggested for the settlement of this issue by government. The sound of floor impact sound is needed to secure comfortable quality in housing. Also, it is required an accurate analysis and a proper evaluation for floor vibration. Refine model is necessary for the floor system of housing to analyze accurately the floor vibration. But this refine model is not efficient because it is required so much running time for vibration analysis and it is difficult of modeling of standard floor slab. In this paper, new modeling methods of standard floor slab are proposed for the accurate rigidity evaluation. By using the new modeling method, the accurate vibration response can be obtained and can accurately evaluate the rigidity of standard floor system with resilient materials. Therefore the proposed modeling method is of practical use for vibration analysis of floor system of housing.
김종인(Jong-In Kim),최영화(Young-Wha Choi) 한국산업융합학회 2004 한국산업융합학회 논문집 Vol.7 No.4
This paper presents a strategy for the quality assurance of the continuous preflex composite girder bridge through the camber management of the girder during construction. The construction stages which require welding, balanced preflexion loads at the ends, etc. may cause unexpected large deformation to the preflex girder. Furthermore, these defects can be detected by measurements and analyses of the girder behavior which is sometimes time consuming. In the present study, preflex girder's camber data at equally spaced nodes in each construction stage are obtained and analyzed for the quality control of thee span continuous preflex girder composite bridge.<br/>