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기능성 및 골격성 전치부 반대교합 환자의 형태학적 차이점에 관한 연구
유임학,김태선 대한치과교정학회 2001 대한치과교정학회지 Vol.31 No.4
본 연구의 목적은 기능성 및 골격성 전치부 반대교합 환자에 대한 형태학적 차이점을 비교하는 것이다. 전치부의 기능성 반대교합을 보이는 28증례와 골격성 반대교합을 보이는 31증례를 각각 실험군과 대조군으로 삼았다. 실험군자 대조군의 평균연령은 9.6±1.8세와 9.8±1.9세이었다 측모두부방사선 사진을 촬영하였으며 두 군간의 형태학적 차이를 비교하기 위해 49개 항목에 대한 계측 및 통계학적인 분석을 시행하였다. 계측항목 중 cranial deflection, maxillary depth, ANB, convexty, NPo-AB, APDI, Mx 1-SN, Mx 1-NA angle, Mx 1-NA, Md 1-NB angle and Md 1-NB에서 통계학적인 유의차가 나타났다. 실험군에서는 Class III로의 성장 가능성, 상악골의 전방위치, 상하악골간의 전후방적 부조화 감소, 상악 중절치의 후퇴, 직립 및 하악 중절치의 전돌, 순측경사를 보였다. (주요 단어 : 형태학적 차이, 기능성 전치부 반대교합, 골격성 전치부 반대교합) The purpose of this study was to compare the dento-skeletal characteristics between functional and skeletal anterior cross-bite patients. Twenty-eight functional anterior cross-bite patients and thirty-one skeletal anterior cross-bite patients were selected as a test and a control group. Mean ages of the test and the control group were 9.6±1.8 and 9.8±1.9, respectively. Lateral cephalograms were taken. Forty-nine cephalometric variables were measured and statistical analysis was performed to find the morphological differences between the groups. Statistically significant differences were found in the cephalometric variables of cranial deflection, maxillary depth, ANB, convexity, NPo-AB, APDI, Mx 1-SN, Mx 1-NA angle, Mx 1-NA, Md 1-NB angle and Md 1-NB. The test group showed more Class III growth potential, more protruded maxilla, lesser maxillo-mandibular difference, more uprighted and retruded maxillary central incisor, more labially tipped and protruded mandibular central incisor. ※ Key words : Morphological differences, Funtional anterior cross-bite, Skeletal anterior cross-bite
Seismic fragility assessment of isolated structures by using stochastic response database
Eem, Seung-Hyun,Jung, Hyung-Jo Techno-Press 2018 Earthquakes and structures Vol.14 No.5
The seismic isolation system makes a structure isolated from ground motions to protect the structure from seismic events. Seismic isolation techniques have been implemented in full-scale buildings and bridges because of their simplicity, economic effectiveness, inherent stability and reliability. As for the responses of an isolated structure due to seismic events, it is well known that the most uncertain aspects are the seismic loading itself and structural properties. Due to the randomness of earthquakes and uncertainty of structures, seismic response distributions of an isolated structure are needed when evaluating the seismic fragility assessment (or probabilistic seismic safety assessment) of an isolated structure. Seismic response time histories are useful and often essential elements in its design or evaluation stage. Thus, a large number of non-linear dynamic analyses should be performed to evaluate the seismic performance of an isolated structure. However, it is a monumental task to gather the design or evaluation information of the isolated structure from too many seismic analyses, which is impractical. In this paper, a new methodology that can evaluate the seismic fragility assessment of an isolated structure is proposed by using stochastic response database, which is a device that can estimate the seismic response distributions of an isolated structure without any seismic response analyses. The seismic fragility assessment of the isolated nuclear power plant is performed using the proposed methodology. The proposed methodology is able to evaluate the seismic performance of isolated structures effectively and reduce the computational efforts tremendously.
Eem, Seunghyun,Choi, In-Kil,Yang, Beomjoo,Kwag, Shinyoung Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.3
In 2011, an earthquake and subsequent tsunami hit the Fukushima Daiichi Nuclear Power Plant, causing simultaneous accidents in several reactors. This accident shows us that if there are several reactors on site, the seismic risk to multiple units is important to consider, in addition to that to single units in isolation. When a seismic event occurs, a seismic-failure correlation exists between the nuclear power plant's structures, systems, and components (SSCs) due to their seismic-response and seismic-capacity correlations. Therefore, it is necessary to evaluate the multi-unit seismic risk by considering the SSCs' seismic-failure-correlation effect. In this study, a methodology is proposed to obtain the seismic-response-correlation coefficient between SSCs to calculate the risk to multi-unit facilities. This coefficient is calculated from a probabilistic multi-unit seismic-response analysis. The seismic-response and seismic-failure-correlation coefficients of the emergency diesel generators installed within the units are successfully derived via the proposed method. In addition, the distribution of the seismic-response-correlation coefficient was observed as a function of the distance between SSCs of various dynamic characteristics. It is demonstrated that the proposed methodology can reasonably derive the seismic-response-correlation coefficient between SSCs, which is the input data for multi-unit seismic probabilistic safety assessment.
Seunghyun Eem,Shinyoung Kwag,Dongchang Kim,Sungjin Chang 국제구조공학회 2024 Smart Structures and Systems, An International Jou Vol.33 No.5
Infrastructure facilities contain various pipe systems, which can be considerably damaged by external loads such as earthquakes. Therefore, structural health monitoring (SHM) and safety assessment of pipes are crucial. Digital twin technology for SHM of pipes is important in the industry. This study proposes a digital twin system that estimates the behavior, stress, and external load of real-scale pipes in real time under simultaneous seismic and external loads using a minimum number of sensors. Vibration tests were performed to construct the digital twin system, and a numerical model was developed that considered the dynamic characteristics of a target pipe. Moreover, a reduced-order modeling technique of a numerical model was applied to enhance its real-time performance. The digital twin system successfully estimated the response of the pipe at all points. Verification of the digital twin system was performed by comparing it with the experimental parameters of a real-scale pipe. The proposed digital twin system can help enhance SHM and system’s maintenance.
임동오(Eem, Dong-o),주상욱(Ju, Sang-wook),정용악(Jung, Young-ag) 한국문화관광학회 2002 문화관광연구 Vol.4 No.1
Leisure life will become more important to the government employees gradually, People with many interests enjoy their spare time. There are several obstacles in enjoying leisure. The big obstacle is money of people think that it costs too much money. The another factor of an impediment is time and holiday. In order to solve this kids of problems, we require special knowledge and efficient work. We reduce a time of remaining affairs and should finish work within a short time. We produce the intended effect. We also need to expand IT in business management and develope some leisure programs in neighborhood.
개방교합 경향을 갖는 성인 여성 환자들의 보상양상에 관한 연구
유임학(Eem-Hak Yoo),김동언(Dong-Un Kim) 대한치과교정학회 2002 대한치과교정학회지 Vol.32 No.1
개방교합 경향을 갖고 있으나 보상작용 등에 의해 전치부 개방교합을 보이지 않는 성인 여성환자들의 보상양태를 관찰하여 진단 및 치료계획 수립에 도움을 주고자 본 연구를 시행하였다. 피개교합 심도지수(ODI)가 66이하이며 전치부 개방교합을 나타내는 증례 (50명)를 대조군으로, 피개교합 심도지수(ODI)가 66이하이나 보상작용에 의하여 전치부 개방교합을 보이지 않는 증례(55명)를 실험군으로 하였다. 대조군과 실험군의 평균연령은 각각 23.88 ± 4.53세와 24.7 ± 6.20세이었다. 측모두부방사선 사진을 촬영하였으며 두 군간의 형태학적 치아를 비교하기 위해 41개 항목에 대한 Mx1-SN, Mx1-FH, Mx1-NA(mm), Mx1-APo, PP to Mx6, Mn1-NB(degree), Mn1-NB(mm)에서 통계학적인 유의차가 나타났다. 실험군에서는 감소된 lower face heifht, N-Me, ANS-Me, ANS-Me/N-Me ratio와 상하악전치의 설측 경사 및 후퇴, 대조군에서는 상악 구치의 과맹출이 관찰되었다. The purposes of this study were to observe the compensation pattern of human female adults with openbite tendency and to provide the decision criteria of the diagnosis and treatment planning for those patients. Fifty patients with anterior openbite and fifty-five patients without anterior openbite patients were selected as a control and a test group. ODI of the all patients was below 66. Mean ages of the control and the test group were 23.88 ± 4.53 and 24.7 ± 6.20 years, respectively. Lateral cephalograms were taken and forty-one variables were measured. To identify the morphological differences between the groups, statistical analyses were performed. Statistically significant differences were found in the measured variables of lower face height, N-Me, ANS-Me, ANS-Me/N-Me ratio, Mxl-SN, Mxl-FH, Mxl-NA(mm), Mxl-APo, PP to Mx6, Mnl-NB(degree), Mnl-NB(mm). The test group showed decreased lower face height, N-Me, ANS-Me, ANS-M -Me ratio, more uprighted and retruded maxillo-mandibular incisors. Overeruption of the maxillary first molar was found in the ontrol group.