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불확실성을 고려한 Tuned Mass Damper System의 슬라이딩 모드 지진동 제어
김조은,이진호 대한건축학회지회연합회 2008 대한건축학회지회연합회 학술발표대회논문집 Vol.2008 No.1
The control performance in active control system can be drastically deteriorated when the modeling errors and the uncertainties existing in the seismic disturbances are disregarded in the designing stage. It can even throw the system into unstable phase, resulting in out of control against the excitations. The purpose of the study is to investigate the control effectiveness of a non-linear control system called sliding mode controller in cooperation with a Tuned Mass Damper System subjected to the three seismic excitations selected from the FFT analysis.
Severe calcified stylohyoid complex in twins: a case report
김조은,민정현,박해랑,최보람,최진우,허경회 대한영상치의학회 2012 Imaging Science in Dentistry Vol.42 No.2
The styloid process is a cylindrical, long cartilaginous bone located on the temporal bone. The calcified stylohyoid ligament and elongated styloid process can be identified radiographically, and they are associated with a number of syndromes and symptoms. The exact cause of the styloid process elongation due to calcification and subsequent ossification of ligament is unclear. This report presents a case of severely calcified stylohyoid ligament complex occurred in twins who have the same pattern of calcification.
김조은,신재명,오성욱,이원진,허민석,이삼선,최순철,허경회 대한영상치의학회 2013 Imaging Science in Dentistry Vol.43 No.4
Purpose: This study was performed to analyze human maxillary and mandibular trabecular bone using the data acquired from micro-computed tomography (micro-CT), and to characterize the site-specific microstructures of trabeculae. Materials and Methods: Sixty-nine cylindrical bone specimens were prepared from the mandible and maxilla. They were divided into 5 groups by region: the anterior maxilla, posterior maxilla, anterior mandible, posterior mandible, and mandibular condyle. After the specimens were scanned using a micro-CT system, three-dimensional microstructural parameters such as the percent bone volume, bone specific surface, trabecular thickness, trabecular separation, trabecular number, structure model index, and degrees of anisotropy were analyzed. Results: Among the regions other than the condylar area, the anterior mandibular region showed the highest trabecular thickness and the lowest value for the bone specific surface. On the other hand, the posterior maxilla region showed the lowest trabecular thickness and the highest value for the bone specific surface. The degree of anisotropy was lowest at the anterior mandible. The condyle showed thinner trabeculae with a more anisotropic arrangement than the other mandibular regions. Conclusion: There were microstructural differences between the regions of the maxilla and mandible. These results suggested that different mechanisms of external force might exist at each site.