국내 지진동 특성에 대한 기기 용접 정착부의 비탄성에너지 흡수계수를 고려한 지진취약도 평가

임승현,김건규,최인길,곽신영 한국지진공학회 2023 한국지진공학회논문집 Vol.27 No.1

In Korea, most nuclear power plants were designed based on the design response spectrum of Regulatory Guide 1.60 of the NRC. However, in the case of earthquakes occurring in the country, the characteristics of seismic motions in Korea and the design response spectrum differed. The seismic motion in Korea had a higher spectral acceleration in the high-frequency range compared to the design response spectrum. The seismic capacity may be reduced when evaluating the seismic performance of the equipment with high-frequency earthquakes compared with what is evaluated by the design response spectrum for the equipment with a high natural frequency. Therefore, EPRI proposed the inelastic energy absorption factor for the equipment anchorage. In this study, the seismic performance of welding anchorage was evaluated by considering domestic seismic characteristics and EPRI's inelastic energy absorption factor. In order to reflect the characteristics of domestic earthquakes, the uniform hazard response spectrum (UHRS) of Uljin was used. Moreover, the seismic performance of the equipment was evaluated with a design response spectrum of R.G.1.60 and a uniform hazard response spectrum (UHRS) as seismic inputs. As a result, it was confirmed that the seismic performance of the weld anchorage could be increased when the inelastic energy absorption factor is used. Also, a comparative analysis was performed on the seismic capacity of the anchorage of equipment by the welding and the extended bolt.

도시재생사업에 적용가능한 택티컬 어바니즘 기법 개발 및 적용 효과분석

임승현,김상경,이경환 대한건축학회 2023 대한건축학회논문집 Vol.39 No.3

The purpose of this study is to develop tactile urbanism techniques applicable to urban regeneration projects and analyze their applicationeffects. The research results revealed the effects of applying the tactical urbanism project, project satisfaction, project sustainability, andresident participation were evaluated higher than average in all four project areas. Upon analyzing the factors affecting such areas, someresults varied depending on the target site, but overall, the higher the comfort, safety, and functionality due to the tactical urbanism project,the higher the level of business satisfaction, project sustainability, and resident participation. Changes in regional comfort, safety, and functiondue to the application of tactile urbanism were found to have a positive effect on the intention to participate in the project, attachment tothe place, and behavioral intention in terms of business satisfaction, project sustainability, and resident participation. These results showed thatby applying the tactical urbanism technique to urban regeneration projects, local residents could increase their willingness to participate in aproject and induce active action. Therefore, tactical urbanism could be used as a strategy to compensate for the limitations of existing urbanregeneration projects. This study was meaningful in that it developed a tectonic urbanism design element applicable to urban regenerationprojects and empirically analyzed the application effect. However, this study was aimed at the urban regeneration new deal project inCheonan Namsan District, and there is a limit to generalizing and applying the results of this study to other regions. Additional studies needto be conducted to apply tectonic urbanization and empirically analyze its effects. 본 연구는 천안 남산지구를 대상으로 도시재생사업에 적용가능한 택티컬 어바니즘 기법을 개발하고 적용효과 및 영향요인을 분석하는데 목적이 있으며, 주요 연구결과를 요약하면 다음과 같다. 첫째, 택티컬 어바니즘 프로젝트 적용효과를 분석한 결과 4개 사업지역 모두 사업만족도, 사업지속성, 주민참여 점수가 평균 이상으로 높게 평가되었다. 둘째, 택티컬 어바니즘 사업만족도와 사업지속성, 주민참여에 영향을 미치는 요인을 분석한 결과 사업대상지에 따라 전반적으로 택티컬 어바니즘 사업을 통해 쾌적성, 안전성, 기능성이 높아질수록 사업만족도와 사업지속성, 주민참여 수준이 높아진 것으로 나타났다. 셋째, 택티컬 어바니즘 적용으로 인한 지역의 쾌적성, 안전성, 기능성 변화는 사업만족도와 사업지속성, 주민참여를 매개로 사업참여의사와 장소애착, 행동의도에 긍정적인 영향을 미치는 것으로 나타났다.

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.

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.

골프장 캐디 서비스품질이 고객만족과 구매 후 행동에 미치는 영향

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

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.