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Ovality가 세그먼트 라이닝의 동적 거동 특성에 미치는 영향
이경주,송기일 사단법인 한국터널지하공간학회 2023 한국터널지하공간학회논문집 Vol.25 No.6
Shield TBM tunnel linings are segmented into segments and rings. This study investigates the response characteristics of the stress and displacement of the segment lining under seismic waves through modeling that considers the interface behavior between segments by applying a shell interface element to the contact surface between segments and rings. And there is no management criteria for ovaling deformation of segment linings in Korea. So, this study the ovality criteria and meaning of segment lining. The results of study showed that the distribution patterns of stress and displacement under seismic waves were similar between continuous linings and segment linings. However, the maximum values of stress and displacement showed differences from segment linings. The stress distribution of the continuous lining modeled as a shell type has a stress distribution that has continuity in the 3D cylindrical shape, but the segment lining is concentrated outside the segment, and the largest stress occurs at the location where the contact surface between the segment and the ring is concentrated. This intermittent and localized stress distribution shows an increasing as the ovality of the lining increases at seismic waves. The ovality at which the increase in stress distribution begins to show irregularity and localization is about 150‰. Ovality of 150‰ is an unrealistic value that cannot represent actual lining deformation. Therefore, the ovality of the segment lining increase with depth, but it does not have a significant impact on the stability caused by seismic load.
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체육수업에서 학생들의 실수 인식과 학업 노력 및 수업 참여와의 관계
이경주,정병근,조홍식 한국체육과학회 2022 한국체육과학회지 Vol.31 No.1
The purpose of this study is to investigate the effects of students' perception of errors on their academic efforts and classroom engagement in PE classes. For this purpose, the investigator found a population of middle and high school students in Gyeonggi Province and selected 331 through convenience sampling. Collected data was put to the multiple regression analysis with the SPSS Win Ver. 23.0 statistical program. The findings were as follows: First, students' perception of errors had statistically significant effects on their academic efforts in PE classes. of the subfactors of their perception of errors, the burden of an error had no significant effects on it. secondly, students' academic efforts had statistically significant impacts on their classroom engagement in PE classes. and finally, their perception of errors had statistically significant influences on their classroom engagement in PE classes. of its subfactors, the burden of an error and the challenge of an error had no significant influences on it.
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DEA-AR/AHP 모형을 이용한 국내 건설기업의 경영효율성 분석
이경주,박정로,김재준,Lee, Kyung-Joo,Park, Jung-Lo,Kim, Jae-Jun 대한건축학회 2012 대한건축학회논문집 Vol.28 No.6
The management efficiency is becoming important for korean construction company after the IMF of 1997 and the global financial crisis of 2008. Previous study analyzed efficiency of construction company using nonparametric method based DEA(Data Envelopment Analysis) model. but To analyze efficiency using DEA model is problem that can be evaluated inefficient company to efficient company. Therefore, this study is to analyze efficiency of korean construction company using DEA-AR(Assurance Region)/AHP model. previous study and theories were studied, variables were selected, and critical variables were for the efficiency analysis. The study analyzed the efficiency of construction companies using the DEA model and the DEA-AR/AHP model and compared the results. The study eliminated the drawbacks of the existing DEA model and ranking for measured values of efficiency required a follow-up process to mark the difference between measured values of efficiency some efficient construction companies. The ranking several construction companies shown the analysis using the existing DEA model. This study is expected to provide reasonable evaluation standards for the management of construction companies in the ranking of companies' management evaluation.
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이경주,김계영 한국차세대컴퓨팅학회 2016 한국차세대컴퓨팅학회 논문지 Vol.12 No.4
본 논문에서는 하나의 팬-틸트-(PTZ) 카메라를 사용한 2m 내외의 원거리에 있는 사람의 시선을 추하는 방법 을 제안한다. 제안된 방법에서는 사람의 치에 따라 카메라를 각모드 는 각모드로 환하여 시선추을 한 상을 획득한다. 각모드에서 카메라 FOV(Field of View) 내에 존재하는 얼굴을 탐지하면 얼굴의 치를 계산 하여 각모드로 환한다. 각모드에서 획득한 상은 원거리에 있는 사람의 시선방향 정보를 담고 있다. 시선의 방향을 계산하기 한 방법은 얼굴포즈 추정과 시선방향 산출 단계로 구성된다. 얼굴포즈 추정은 얼굴에서 과 코 의 치정보를 이용하여 추정한다. 그리고 시선방향은 먼 가변템릿을 통해 동공을 분할하고, 의 양 끝과 얼 굴포즈 정보를 이용하여 안구 심을 추출하는 과정으로 산출한다. 실험에서는 본 논문에서 제안한 시선추 알고리 즘이 원거리에 있는 사람의 시선방향을 효과으로 산출하는 것을 거리별 실험을 통해 보여다. This paper suggests a method for tracking gaze of a person at a distance around 2 m, using a single pan-tilt-zoom (PTZ) camera. In the suggested method, images are acquired for gaze tracking by turning the camera to the wide angle mode, or the narrow angle mode, depending on the location of the person. The face that is present in the field of view (FOV) of a camera, is detected in the wide angle mode. Once the location of the face is calculated, the camera turns to the narrow angle mode. The images, which have been acquired in the narrow angle mode, contain information on the direction of gaze of the person, who is at a distance. The method for calculating the direction of gaze is comprised of the head pose estimation, and gaze direction calculation steps. The head pose estimation is performed, by using the location information on the eyes and nose in the face. And the direction of gaze is generated using the process of partitioning the pupil, through a deformable template, and extracting the center of an eye using the end points of both eyes and head pose information. This study shows that the proposed gaze tracking algorithm can effectively track the direction of a person's gaze, at varying distances.
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