직교보를 고려한 RCS 구조 보-기둥 접합부의 극한전단강도

안재혁 한국안전학회 2005 한국안전학회지 Vol.20 No.3

나선형 파동유도관 결합을 통한 초음파센서의 탐지범위 개선

안재혁,김진오 한국소음진동공학회 2022 한국소음진동공학회 논문집 Vol.32 No.3

This paper presents a method to improve the detectable range of an ultrasonic sensor for distance measurements by coupling the sensor with a helical waveguide. In particular, this study aimed to decrease the effective length of circularly curved waveguides, in addition to reducing the minimum and maintaining the maximum detectable distances. To this end, finite element analyses were used to predict the ultrasound propagation in a waveguide with a uniform circular cross-section along the spiral path. Two types of cross-sectional sizes were compared: one with a diameter identical to that of the sensor face and another with a diameter twice this value. Furthermore, experiments were performed with fabricated prototypes to evaluate the detectable range by measuring the minimum and maximum detectable distances. Notably, by coupling the helical waveguide with the ultrasonic sensor, the minimum detectable distance was reduced to 1/3 times that for a sensor without the waveguide, while the maximum detectable distance was maintained. Moreover, the effective length of the helical waveguide was decreased, as compared with that of linear or circularly curved waveguides.

양화나루 잠두봉 경관조명

안재혁 한국조명전기설비학회 2002 조명.전기설비 Vol.16 No.5

철골보와 철근콘크리트기둥으로 이루어진 접합부의 기존 내력평가법에 관한 비교연구

안재혁,박천석 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

This paper is on the study of strength evaluation for the frame joint made from reinforced concrete column and steel beam(RCS system joints). Especially for those categorized as through beam type, the accuracy of the existing design equations proposed in the inside and outside of the country was studied in detail with shear key such as face bearing plate(FBP), Extended FBP, vertical joint reinforcement. It was shown that strength evaluation equations proposed in James K. Wight provided the most accurate and consistent strength estimates. Some design equations proposed by Japanese often underrated the joint strength for specific joint details.

복합구조 보-기둥 접합부의 비선형 유한요소해석

안재혁,박천석 대한건축학회지회연합회 2008 대한건축학회연합논문집 Vol.10 No.3

전계효과트랜지스터 기반 바이오센싱 기술

안재혁 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.0

직교보를 고려한 복합구조 보-기둥 접합부의 전단강도 평가법 제안

안재혁,박천석 대한건축학회지회연합회 2016 대한건축학회연합논문집 Vol.18 No.1

현재 미국, 일본뿐만 아니라 국내에서도 복합구조의 실용화를 위한 보-기둥 접합부의 응력메카니즘에 대한 연구가 진행되고 있지만, 복합구조에 대한 보-기둥 접합부의 거동과 구조적 성능에 대한 연구가 행해지면서 대부분의 연구들은 각 접합부 상세가 접합부 거동에 미치는 영향과 특성만 분석하고, 이를 고려한 응력전달기구에 대한 명확한 연구가 이루어지지 않고 있다. 실제 구조물에서 보-기둥 접합부에 직교보가 있음에도 불구하고 대부분의 연구가 보-기둥 접합부의 전단저항기구를 모델화하면서도 직교보의 영향을 고려하지 않고 있다. 따라서 본 연구에서는 직교보가 복합구조 보-기둥 접합부에 미치는 영향을 고려하는 전단저항기구를 모델화하여 보-기둥 접합부의 전단강도를 산정하는 방법을 제안하고 기존 연구1)에서 직교보가 있는 복합구조 보-기둥 접합부 실험체를 대상으로 전단강도를 산정하여 구조적 거동에 미치는 영향을 검토하고자 한다. Composite structure composed of steel beam and reinforced concrete column has been researched and developed as one of structure systems which combine the members that have different structural system, in order to secure function which is hard to achieve in existing structural system. However, many existing studies analyzed only the characteristics and effect on the behavior of joint, and clear studies have not been proceeded on the stress transfer mechanism which considers characteristics and effect of transverse beam. Specifically, the effect of transverse beam of beam-column joints has not been considered at all. Therefore, this study proposes a method to estimate the shear strength on beam-column joints of Composite structure with transverse beam by modeling the shear resistance mechanism that considers the effect of transverse beam on beam-column joints of composite structure. In addition, this study reviewed factors which affect the shear resistance mechanism, the effect of transverse beam on the structural behavior of beam-column joints by analysis and testing the specimens of the existing study.

직교보 단면크기 변화에 따른 RCS구조 보-기둥 접합부의 전단내력에 관한 실험적 연구

안재혁,박천석 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 논문집 Vol.10 No.6

최근 시공의 합리화와 경제성의 목적으로 한 다양한 연구가 진행되고 있다. 철근 콘크리트 기둥과 철골 보로 이루어진 RCS 구조의 개발에 대한 연구 역시 활발해지고 있다. RCS 구조 보-기둥 접합부 패널존의 저항기구는 내부패널에서 외부패널로 응력이 전달될 때 직교보의 영향을 받지만, 기존연구에는 직교보의 영향을 고려하지 않고 있다. 본 연구에서는 웨브, 플랜지, 직교보의 두께, FBP의 유뮤등 다양한 변수들을 가지는 5개의 철근콘크리트 기둥과 철골보로 이루어진 보-기둥 내부접합부 실험체의 실험을 통해 직교보들의 영향과 구조적 성능을 조사하고자 한다. 이러한 실험결과들로부터, 보-기둥 접합부의 직교보가 전단내력과 구조성능을 향상시키는데 효과적이라는 것을 알 수 있다. Recently, in order to realization of construction and economical saving, various studies are progressing. Also, the study on RCS system which is consisted of reinforced concrete column and steel beam is progressing actively. Actually, however, resisting mechanism of panel zone is influenced by transverse beams when the stress transfers inner panel to outer panel but existing literature didn't reflect the effect of transverse beams. This paper is to analyze the test result of five inner beam-column joints specimen with a variable such as web, flange thickness of transverse beam and face bearing plate(FBP) for RCS systems were tested under cyclic loadings conforming to NEHRP recommendation to investigate the effect of transverse beams and the structural performance of beam-column joints. From the test result, it was shown that transverse beams are effective to enhance the shear strength and structural performance of beam-column joints.

태권도장의 교육서비스품질과 도장이미지, 학부모만족, 재등록의도의 관계

안재혁,진대근,조송현 한국사회체육학회 2024 한국사회체육학회지 Vol.- No.96

Purpose: The purpose of this study is to analyze the quality of educational services provided by Taekwondo centers and to determine the effect of the quality on the Taekwondo center’s image, parental satisfaction, and intention to re-enroll. Through this, the intention is to provide fundamental data for the efficient operation and management revitalization of Taekwondo centers. Method: For this study, parents of trainees attending a Taekwondo gym in Busan were selected as the population, and 355 people were sampled using convenience sampling. Among them, 25 people who were judged to have partially completed the questionnaire or were unreliable in their responses were excluded. Data from 330 individuals were finally used to analyze the results of this study. The statistical analysis techniques used in this study were frequency analysis, confirmatory factor analysis, reliability analysis, correlation analysis, multiple regression analysis, and simple regression analysis using the IBM SPSS Statistics 26.0 statistical package program. Results: The results derived from this study, utilizing the described research methods and the results of data analysis, are as follows. First, it was found that the quality of educational services of Taekwondo centers had a positive effect on the center’s image. Second, it was found that the quality of educational services in Taekwondo centers had a partially positive effect on parent satisfaction. Third, it was found that the quality of educational services of Taekwondo centers had a partially positive effect on the intention to re-enroll. Fourth, it was found that the center’s image had a positive effect on parental satisfaction. Fifth, it was found that the center’s image had a positive effect on the intention to re-enroll. Lastly, it was found that parental satisfaction had a positive effect on the intention to re-enroll. Conclusion: The study confirmed that the quality of educational services in Taekwondo schools positively influenced parents’ perceptions of the school’s image and satisfaction. This positive image and satisfaction could lead to customers’ intention to re-enroll. Therefore, it is recommended that the educational service quality of Taekwondo schools should be continuously enhanced through instructor training and various media.

鐵筋콘크리트스터브로 補强한 鐵骨보와 鐵筋콘크리트기둥으로 構成된 連結部의 剪斷耐力에 관한 硏究

안재혁,이원우,박천석 대한건축학회지회연합회 2000 대한건축학회연합논문집 Vol.2 No.4