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강덕신,이홍민,박효선,이임평,Kang. Deok-Shin,Lee. Hong-Min,Park. Hyo-Seon,Lee. Im-Pyeong 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
Terrestrial Laser Scanning(TLS) was developed at the mid-to-late 1990s. This technique enables to perform reconnaissance surveying of regions or structures hard to access. Besides, TLS has been extended its application gradually such as preservation of historical remains, underground surveys, slopes, glaciers monitoring and so on. However, though the technique has a lot of advantages, an application for structural health and safety monitoring is a beginning stage and it need much research. Therefore in this study, as a groundwork, the estimation model on stress of structures using TLS and Finite Element Method(FEM) applied by the Digital Elevation Model(DEM) technique of geoinformatics is proposed. For the verification of this model, experiments were performed with a continuous steel beam subjected to point loads and outputs were compared with those of electrical strain sensors.
선형 삼각형 격자 근사법을 활용한 지상 레이저 스캐닝에 의한 구조물의 변형 계측기법
강덕신 ( Kang Deok Shin ),이홍민 ( Lee Hong Min ),박효선 ( Park Hyo Seon ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
Terrestrial laser scanning (TLS) delineates surface of every solid object precisely in three dimensions and is recently applied to various fields of geographic information system (GIS), natural science, civil engineering and so on. In the former research, estimation model on stress of structures using TLS is proposed. The method generated deformed shape of the structure appling grid subdivision and average coordinates of points in each subdivision area. However it was not sufficient for structural health monitoring because of errors originated from 3-D data of TLS. Therefore, in this paper, the linear triangle grid fitting method as an advanced approach is suggested for processing the 3-D data from TLS and deflections measured from TLS system are compared with deflections directly measured from linear variable displacement transducers (LVDT).
인공신경망을 이용한 초고층 주거복합 구조물의 시스템 식별 및 해석 모델 교정
김규진,강덕신,김형도 한국방재학회 2019 한국방재학회논문집 Vol.19 No.4
To estimate the serviceability and safety of high-rise buildings under various dynamic-loading conditions, a reliable analytical model is needed. In this study, an analytical-model calibration process is proposed to obtain a reliable analytical model for high-rise buildings. A high-rise residential complex building is selected as a test bed, and the natural frequency and mode shape are derived from vibration measurement. On the basis of the measurement, analytical-model calibration using artificial neural network is performed to update the initial analytical model. Through this process, the calibrated analytical model exhibits remarkable coherence with the measurement at the principal natural frequency and mode shape at an acceptable tolerance level. 다양한 하중 시나리오에 대한 초고층 건축물의 사용성 및 안전성 평가를 위해서는 신뢰성 있는 해석 모델의 생성이 필요하다. 본 연구에서는 초고층 건축물의 신뢰성 있는 해석 모델 생성을 위한 일련의 Calibration Process를 제안한다. 이에 초고층 주거복합 구조물을 Test Bed로 선정하여 상시 상태에서의 진동 계측을 통한 고유진동수 및 모드형상을 도출하였고, 인공신경망 기반 초기 해석 모델의 교정을 수행하였다. 이러한 과정을 통해 생성한 해석 모델은 주요 고유진동수 및 모드형상에 대해 실제 대상 건축물과 허용 오차 범위 내 충분히 유사한 결과를 제시하였다.
박노혁,배경수,신현웅,양근석,염헌규,류춘욱,김용길,서경진,강덕신 대한영상의학회 1996 대한영상의학회지 Vol.35 No.1
Purpose : To evaluate the clinical utility of the teleradiology system using the information super highway communication network. Materials and Methods : Two radiologists selected 101 cases of pneumothorax and 20 cases of miliary tuberculosis. There were scanned and transmitted to our hospital at a speed of 640 Kbps and displayed on a video monitor with a resolution of 1280 pixels/line $\times$ 1024 lines. Four radiologists divided into three groups :read the images group A read the images without image processing ; group B read the images with image processing, group C read the radiographic films on the view box. The authors compared sensitivity and specificity between the groups and checked their statistical significance using the Chi-square test. According to the location of the pleural line, we divided the pneumothorax into four types : continve on this live type 1, pleural line confined to the apex ; type 2, to the upper half ; type 3, to the lower half ; type 4, to the upper through lower half. We then compared sensitivity between the Three groups. Results : In the pneumothorax group, the average sensitivity of group A, B and C was 79%, 90% and 96%, and average specificity was 99%, 99% and 94%, respectively. There were statistically significant differences in sensitivity between group A and B and between group B and C (p<0.017).There were no statistically significant difference in specificity between group A and B or between group B and C. In the miliary tuberculosis group, the average sensitivity of group A, B and C was 73%, 78% and 90%, and average specificity was 95%, 95% and 100%, respectively. With regard to sensitivity and specificity, there was no statistically significant difference between group A and B or between group B and C but there was a statistically significant difference between group A and C (p<0.017). According to the location of the pneumothorax, for all types, the sensitivity of group A was less than that of group B and group B was less than that of group C. Conclusion : All groups showed reduced observer performance in the detection of pneumothorax and military tuberculosis when reading a transmitted image on the monitor-workstation compared with reading conventional radiographs on the view box. To improve the clinical utility of the teleradiology system, a higher resolution workstation and adequate image processing are required.