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LED와 유리관 스위치 센서를 이용한 스마트 콘크리트의 개발
김이성(Kim Ie-Sung),이수곤(Lee Soo-Gon),고주환(Ko Joo-Hwan),김동혁(Kim Dong-Hyeok),김화중(Kim Wha-Jung) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.11
Today, peoples have much interest about safety while an abnormal weather phenomenon is weighted increased. R.C buildings are consisting of main loaded members. Concrete are brittle materials and they are which come to brittle fracture rapidly by progress of cracks. If a research trend present in and outside the country is often seen, the structure measurement method of having used PZT and the optical fiber (FBG) will be the actual condition which has accomplished the stock. In order to manage such cracks, time, efforts and expense are required. Such a method has many difficulties in application of a structure by the difficult problem of the measurement range, and the expensive sensor price. Progressive cracks were generated by fracture of glass pipe sensor. Moreover, the experiment which can detect damage propriety by external Light Emitting Diode by damaging a glass pipe by load change with the application of switch using strain gage of a glass pipe was conducted.
전기저항과 압전소자를 이용한 무선 손상자현 스마트 콘크리트의 개발
김이성 ( Kim Ie Sung ),이수곤 ( Lee Soo-gon ),김화중 ( Kim Wha-jung ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
Concrete are brittle materials and they are which come to brittle fracture rapidly by progress of cracks. Therefore, what the time for repairing the damage portion is understands importantly by such cracks. PZT and Electric Resistance are widely used to experiment in damage of element. If pressure is received, resistance and voltage will increase, and if tension is received resistance and voltage will decrease in Electric resistance and PZT. They are interested in the crack monitoring of structure using FM radio sensor and PZT sensor. In this study, the monitoring to a crack was studied using FM radio sensor and PZT sensor. Therefore, the purpose of this study is the fundamental research which detects damages of main members using the compound sensor which consisted of the radio sensors of resistance, PZT, and FM system.
3축 가속도계를 이용한 철근 콘크리트 보에서의 손상평가
김이성,박강근,김태곤,김동혁,김화중,Kim, Ie-Sung,Park, Kang-Geun,Kim, Tae-Gon,Kim, Dong-Hyeok,Kim, Wha-Jung 한국공간구조학회 2008 한국공간구조학회지 Vol.8 No.6
철근 콘크리트 구조물에서 발생하는 균열에 의한 손상은 과도한 하중이나 사용성에 의해 발생한다. 이러한 손상을 검사하는 방법으로 육안으로 확인하거나 비파괴 시험법을 주로 이용하고 있다. 후자의 경우, 콘크리트 내부 철근의 배근 방향성에 의해 균열에 의한 손상인지 판별하기 어려운 문제가 발생하게 되며, 비파괴시험(Non-destructive Test)에 사용되는 대부분의 센서(Sensor)는 1축 가속도 센서이기 때문에 중첩된 전달파를 분석하기에는 어렵다. 따라서, 이를 해결하기 위해 중공 유리관을 이용하였고 콘크리트 보 내부에 매입하여 철근이 매입되어 있는 경우에 대하여 3축 가속도계를 이용하여 탄성파로 가진 하였을 경우에 발생하는 파(Wave)를 비교 분석하였다. The R.C Building will be superannuated as time passes by heavy load and serviceability. Methods of damage detection are used a visual angle of human or non-destructive test in the R.C Building. In case of the latter, Problems of damage detection are occurred to directions of steel bar. Elastic waves are difficult to assaying test using 1 axial type of accelerometer in reinforced concrete. In this study, fundamental studies for estimations using 3 axial type of accelerometer are discussed oscillator of elastic waves when embedded glass tube pipe or steel bar in flexible concrete specimens.
전기저항과 압전소자를 이용한 무선 손상자현 스마트 콘크리트의 개발
김이성(Kim Ie Sung),이수곤(Lee Soo-Gon),김화중(Kim Wha-Jung) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Concrete are brittle materials and they are which come to brittle fracture rapidly by progress of cracks. Therefore, what the time for repairing the damage portion is understands importantly by such cracks. PZT and Electric Resistance are widely used to experiment in damage of element. If pressure is received, resistance and voltage will increase, and if tension is received resistance and voltage will decrease in Electric resistance and PZT. They are interested in the crack monitoring of structure using FM radio sensor and PZT sensor. In this study, the monitoring to a crack was studied using FM radio sensor and PZT sensor. Therefore, the purpose of this study is the fundamental research which detects damages of main members using the compound sensor which consisted of the radio sensors of resistance. PlT, and FM system.
김이성(Kim Ie-Sung),김화중(Kim Wha-Jung) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.12
A various structural materials arc used in construction projects such as it stone, concrete, steel materials. Between of them, concrete are used widely. The compressive strength of concrete is high, and its maintenance and management is comparatively easy. The R.C Building will he superannuated as time passes. This program is generated by propagation of cracks. In order to manage such cracks, time and efforts, expense, etc. are required. In this study, glass sensors were embedding in a model beam and column and leakage of fluorescence and adhesive material was investigated. Further, currents in glass pipe were observed to find the leakage of liquid in glass pipes. Progressive cracks generated by cause the fracture of glass pipes. Therefore, the liquid become to flow and electric current stops, and the cracked part of the member can be found easily. Moreover, the adhesive delays progressive cracking system that responds in air, and the life of a structure can be made to extend. In a result of an experiment. When concretes were carrying out glass pipe tube, glass capsule, PVC tube, detection and a repair action of damage were able to be considered.<br/> The purpose of this research is to develop of low price sensors that can perform of self-diagnosis in addition to ability of concrete repair concrete to damage.
배추, 양상추 및 시금치의 생장별 시스테인, 글루타치온 및 비타민 C의 함량 변화
김주성(Ju-Sung Kim),심이성(Ie-Sung Shim),김일섭(Il-Seop Kim),김명조(Myong-Jo Kim) 한국원예학회 2010 원예과학기술지 Vol.28 No.2
This study was conducted to gather basic information on the relationship between growth condition and formation of the functional substances in plants. Several vegetable crops were screened in consideration of glutathione and ascorbic acid contents; vegetable consumption amount was also used as a selection criteria. Chinese cabbage and spinach were selected for their higher glutathione contents and head lettuce for its lower. The different tendency of relationship between the growth condition of each plant and the glutathione content was observed. When vegetables were grown at various combination ratios of andosol, river sand, and compost, the growth rate was the highest at the ratios of 6.5:3.5:2.0. The glutathione content in Chinese cabbage and head lettuce differed depending on the soil condition, while it did not differ in spinach. Glutathione and ascorbic acid contents were higher at four-leaf stages than two-leaf stages of each vegetable. Moreover, they were higher in the young leaves than the old leaves of each seedling. These results suggest that the functional substances such as glutathione and ascorbic acid in vegetables are changed with the growth stage. Therefore, growth conditions to obtain their highest contents should be studied further.