Opendata 기반 포항 및 경주지진에 의한 건물손상 평가

임승현,양범주,전해민 한국지진공학회 2018 한국지진공학회논문집 Vol.22 No.3

Severe earthquakes can cause damage to society both socially and economically. An appropriate initial response can alleviate damage from severe earthquakes. In order to formulate an appropriate initial response, it is necessary to identify damage situations in societies; however, it is difficult to grasp this information immediately after an earthquake event. In this study, an earthquake damage assessment methodology for buildings is proposed for estimating damage situations immediately after severe earthquakes. A response spectrum database is constructed to provide response spectra at arbitrary locations from earthquake measurements immediately after the event. The fragility curves are used to estimate the damage of the buildings. Earthquake damage assessment is performed from the response spectrum database at the building scale to provide enhanced damage condition information. Earthquake damage assessment for Gyeongju city and Pohang city were conducted using the proposed methodology, when an earthquake occurred on September 12, 2016, and November 15, 2017. Results confirm that the proposed earthquake damage assessment effectively represented the earthquake damage situation in the city to decide on an appropriate initial response by providing detailed information at the building scale.

학교체육 교육과정의 개정차시에 대한 고찰

임승현 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.4

지진 손상 상관성이 플랜트의 확률론적 지진 안전성 평 가에 미치는 영향

임승현,곽신영,최인길,전법규,박동욱 한국지진공학회 2021 한국지진공학회논문집 Vol.25 No.2

Nuclear power plant’s safety against seismic events is evaluated as risk values by probabilistic seismic safety assessment. The risk values vary by the seismic failure correlation between the structures, systems, and components (SSCs). However, most probabilistic seismic safety assessments idealized the seismic failure correlation between the SSCs as entirely dependent or independent. Such a consideration results in an inaccurate assessment result not reflecting real physical phenomenon. A nuclear power plant’s seismic risk should be calculated with the appropriate seismic failure correlation coefficient between the SSCs for a reasonable outcome. An accident scenario that has an enormous impact on a nuclear power plant’s seismic risk was selected. Moreover, the probabilistic seismic response analyses of a nuclear power plant were performed to derive appropriate seismic failure correlations between SSCs. Based on the analysis results, the seismic failure correlation coefficient between SSCs was derived, and the seismic fragility curve and core damage frequency of the loss of essential power event were calculated. Results were compared with the seismic fragility and core damage frequency of assuming the seismic failure correlations between SSCs were independent and entirely dependent.

생활체육지도자의 역할이 노인의 여가만족 및 여가태도에 미치는 영향

임승현,안준석,남인수 한국스포츠학회 2012 한국스포츠학회지 Vol.10 No.3

전통시장 시장환경특성이 상인들의 영업환경만족도와 기대 매출에 미치는 영향

임승현,이경환 대한건축학회 2021 대한건축학회논문집 Vol.37 No.5

최근 대형 할인매장, 기업형 할인매장(SSM)과 같은 대형상업시설에 비해 상대적으로 영세하고 경쟁력이 약한 전통시장 활성화를 위하여 다양한 활성화 사업이 진행되고 있다. 그러나 대부분의 사업은 중앙정부 주도의 하향식 구조로 사업의 주체인 상인들의 영업환경만족도에 영향을 미치는 요인을 분석한 연구는 부재하다. 이에 본 연구는 전통시장 개인 및 점포특성, 시장환경특성이 상인들의 영업환경만족도, 기대 매출 사이의 관계를 규명하는 데 목적이 있다. Various revitalization projects are underway to boost traditional markets, which are relatively smaller and less competitive than largecommercial facilities such as large discount stores and corporate discount stores (SSMs). However, most projects are top-down structures ledby the central government. The research to date has failed to analyze the factors affecting the satisfaction of retailer—the main agents of theproject—with their environmental satisfaction. Therefore, the purpose of this research is to establish the characteristics of individuals andstores in traditional markets, the satisfaction of merchants with their environmental satisfaction, and the relationship between their satisfactionand expected sales. To this end, 200 surveys of Cheonan Central Market retailer were used as final data, and 25 people were interviewedusing the structural equation model. An analysis was then conducted on the impact of the environmental characteristics of the market on theretailer’ satisfaction with their environmental satisfaction and the expected sales of retailer. One main finding is that the followingcharacteristics affected the satisfaction of retailer with their environmental satisfaction: the operation period of the store, the type of store, thefinancial factors, the security environment, the convenience of use, and sanitary conditions. The permanent satisfaction of the retailer and thefinancial factors had a significant impact on the revisit rate and expected sales. It was also found that improvements in the marketenvironment had a knock-on effect on sales expected through the medium of environmental satisfaction and revisit rate, thereby affecting therevitalization of traditional market commercial districts.

다수기의 확률론적 지진안전성 평가를 위한 지진손상 상관계수의 적용

임승현,곽신영,최인길,Eem, Seunghyun,Kwag, Shinyoung,Choi, In-Kil 한국전산구조공학회 2021 한국전산구조공학회논문집 Vol.34 No.5

후쿠시마 원전사고 발생으로 다수기의 지진안전성에 관한 연구의 필요성이 부각되었다. 한 부지에 건설된 원자력발전소의 경우 유사한 지진응답을 보이기 때문에 적게나마 원자력발전소 SSCs간의 지진손상에 대하여 상관성이 존재하므로 합리적 지진안전성 평가를 위하여 지진손상 상관성을 고려하여야 한다. 본 연구에서는 쌍둥이 호기의 필수전원상실사건에 대하여 확률론적 지진안전성 평가를 수행하였다. 적절한 지진손상 상관계수를 도출하기 위하여 확률론적 지진응답해석을 수행하여 적용하였다. External Event Mensuration System 프로그램을 활용하여 다수기의 필수전원상실사건의 고장수목을 구성하여 지진취약도 및 지진리스크를 분석하였다. 또한 SSCs간의 지진손상 상관성을 완전독립 및 완전종속으로 고려하여 비교 분석을 수행하였다. The 2011 East Japan Earthquake caused accidents at a number of nuclear power plants in Fukushima, highlighting the need for a study on the seismic safety of multiple NPP (Nuclear Power Plant) units. In the case of nuclear power plants built on a site that shows a similar seismic response, there is at least a correlation between the seismic damage of structures, systems, and components (SSCs) of nuclear power plants. In this study, a probabilistic seismic safety assessment was performed for the loss of essential power events of twin units. To derive an appropriate seismic damage correlation coefficient, a probabilistic seismic response analysis was performed. Using the external event mensuration system program, we analyzed the seismic fragility and seismic risk by composing a failure tree of multiple loss of essential power events. Additionally, a comparative analysis was performed considering the seismic damage correlation between SSCs as completely independent and completely dependent.

골프장 캐디 서비스품질이 고객만족과 구매 후 행동에 미치는 영향

임승현,배준원,박미향,남경완 한국스포츠리서치 2007 한국 스포츠 리서치 Vol.18 No.1

고진동수 지진에 대한 기기 정착부의 비탄성 거동을 고려한 지진취약도 평가

임승현,곽신영,최인길,정재욱,김석철,Eem, Seunghyun,Kwag, Shinyoung,Choi, In-Kil,Jung, Jae-Wook,Kim, Seokchul 한국지진공학회 2021 한국지진공학회논문집 Vol.25 No.6

Nuclear power plants in Korea were designed and evaluated based on the NRC's Regulatory Guide 1.60, a design response spectrum for nuclear power plants. However, it can be seen that the seismic motion characteristics are different when analyzing the Gyeongju earthquake and the Pohang earthquake that has recently occurred in Korea. Compared to the design response spectrum, seismic motion characteristics in Korea have a larger spectral acceleration in the high-frequency region. Therefore, in the case of equipment with a high natural frequency installed in a nuclear power plant, seismic performance may be reduced by reflecting the characteristics of domestic seismic motions. The failure modes of the equipment are typically structural failure and functional failure, with an anchorage failure being a representative type of structural failure. In this study, comparative analyses were performed to decide whether to consider the inelastic behavior of the anchorage or not. As a result, it was confirmed that the seismic performance of the anchorages could be increased by considering the inelastic behavior of an anchorage.

구조물 및 기기의 내진성능 평가를 위한 고주파수 지진에 의한 원자력발전소의 지진응답 증폭계수

임승현,최인길,전법규,곽신영,Eem, Seung-Hyun,Choi, In-Kil,Jeon, Bub-Gyu,Kwag, Shinyoung 한국지진공학회 2020 한국지진공학회논문집 Vol.24 No.3

Analysis of the 2016 Gyeongju earthquake and the 2017 Pohang earthquake showed the characteristics of a typical high-frequency earthquake with many high-frequency components, short time strong motion duration, and large peak ground acceleration relative to the magnitude of the earthquake. Domestic nuclear power plants were designed and evaluated based on NRC's Regulatory Guide 1.60 design response spectrum, which had a great deal of energy in the low-frequency range. Therefore, nuclear power plants should carry out seismic verification and seismic performance evaluation of systems, structures, and components by reflecting the domestic characteristics of earthquakes. In this study, high-frequency amplification factors that can be used for seismic verification and seismic performance evaluation of nuclear power plant systems, structures, and equipment were analyzed. In order to analyze the high-frequency amplification factor, five sets of seismic time history were generated, which were matched with the uniform hazard response spectrum to reflect the characteristics of domestic earthquake motion. The nuclear power plant was subjected to seismic analysis for the construction of the Korean standard nuclear power plant, OPR1000, which is a reactor building, an auxiliary building assembly, a component cooling water heat exchanger building, and an essential service water building. Based on the results of the seismic analysis, a high-frequency amplification factor was derived upon the calculation of the floor response spectrum of the important locations of nuclear power plants. The high-frequency amplification factor can be effectively used for the seismic verification and seismic performance evaluation of electric equipment which are sensitive to high-frequency earthquakes.

다중기기 손상 상관성에 의한 지진리스크 영향 분석

임승현,최인길,Eem, Seung-Hyun,Choi, In-Kil 한국지진공학회 2019 한국지진공학회논문집 Vol.23 No.2

The seismic safety of nuclear power plants has always been emphasized by the effects of accidents. In general, the seismic safety evaluation of nuclear power plants carries out a seismic probabilistic safety assessment. The current probabilistic safety assessment assumes that damage to the structure, system, and components (SSCs) occurs independently to each other or perfect dependently to each other. In case of earthquake events, the failure event occurs with the correlation due to the correlation between the seismic response of the SSCs and the seismic performance of the SSCs. In this study, the EEMS (External Event Mensuration System) code is developed which can perform the seismic probabilistic safety assessment considering correlation. The developed code is verified by comparing with the multiplier n, which is for calculating the joint probability of failure, which is proposed by Mankamo. It is analyzed the changes in seismic fragility curves and seismic risks with correlation. As a result, it was confirmed that the seismic fragility curves and seismic risk change according to the failure correlation coefficient. This means that it is important to select an appropriate failure correlation coefficient in order to perform a seismic probabilistic safety assessment. And also, it was confirmed that carrying out the seismic probabilistic safety assessment in consideration of the seismic correlation provides more realistic results, rather than providing conservative or non-conservative results comparing with that damage to the SSCs occurs independently.