http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
언어네트워크분석을 활용한 지속가능한 스마트시티 연구 동향분석
오주연(Jooyeon Oh),강지훈(Jihoon Kang) 한국진로창업경영학회 2022 한국진로창업경영학회지 Vol.6 No.1
본 연구의 목적은 언어네트워크분석을 통해 지속가능한 스마트시티의 국내연구동향을 분석하는 것이다. 연구결과는 다음과 같다. 첫째, 지속가능한 스마트시티 연구가 처음으로 등장한 시기는 2016년으로 2016년 이후 점차적으로 논문이 증가하는 것으로 나타났다. 둘째, 지속가능한 스마트시티 관련 연구에서 가장 많이 등장하였던 핵심어는 ‘개발(42회)’, ‘기술(40회)’, ‘거버넌스(37회)’, ‘혁신(36회)’, ‘서비스(36회)’ 등의 순으로 나타났다. 셋째, 연결중심성이 높은 핵심어인 ‘기술’, ‘시민’, ‘정책’, ‘혁신’은 매개중심성, 위세중심성, 근접중심성 지표 모두 높게 나타났다. 본 연구결과는 스마트시티 관련 정부 기관들과 민간 기업들에 스마트시티에 대한 정책수립과 전략방향을 수립하는데 유용한 정보가 될 것으로 기대된다. This study aims to analyze the research trends of smart cities in South Korea using semantic network analysis. The results of this study are as follows. First, the research on sustainable smart cities was published in 2016 for the first time, and the number of papers has gradually increased after 2016. Second, the keywords that appeared the most in sustainable smart city-related studies were ‘development(42 times)’, ‘technology(40 times)’, ‘governance(37 times)’, ‘innovation(36 times)’, ‘service(36 times)’, and so on. Third, the keywords with high degree centrality, such as technology , citizen , policy and innovation , also showed high betweenness centrality, eigenvector centrality, and closeness centrality. These findings are expected to be useful information for smart city-related government agencies and companies to establish policies and strategic directions for smart cities.
이동엽(DongYeop Lee),오주연(JooYeon Oh),조인식(InSik Cho),김태형(TaeHyoung Kim),안종기(JongGi Ahn) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Owing to the increasing requirements in the market, mechanical components must have also an increasing life, which involves an improvement over high cycles in the fatigue strength. In the field of power systems, an ultrasonic fatigue test system is essential to analyze the crystal structure and heat transfer coefficient of metallic materials. The fatigue fracture and temperature distribution of Al6061-T6 alloy and SAE52100 bearing steel was analyzed by measuring the elastic modulus of specimen. Temperature distribution as a function of time of the two specimens starting from 25℃ to 260℃ was confirmed at the final break. Rapidly increase in temperature to 260℃ where cause the cracks, Effective Volume and elastic resonance is expected due to the stress concentration. Period of load functions to prevent ultrasonic fatigue testing and optimization of the thermal effect was described. Brazing process is being applied for the evaluation of the fatigue strength of joints ultrasonic fatigue test method is proposed. This study is concerned with the development of a new mechanical device for ultrasonic fatigue testing (UFT) and its characterization. The newly developed UFT device was developed by Mbrosia Co., Ltd.
초음파피로시험법을 이용한 엔지니어링 플라스틱(POM)의 내구성평가
황정호(JungHo Hwang),오주연(JooYeon Oh),김현창(HyunChang Kim),오세훈(SaeHoon Oh),조인식(InSik Cho),이창순(ChangSoon Lee),박인규(InGyu Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Due to the extensive long service life for automotive components, the behavior of very high cycle fatigue(VHCF) is gained attention. For this reason, the newly developed piezoelectric ultrasonic fatigue test (UFT) system by Mbrosiatec Co. Ltd<SUP>1</SUP> is used to investigate the high cycle fatigue (HCF) strength of Engineering Plastic(EP). The plate-shaped specimens are investigated in the range of 10<SUP>6</SUP> to 10<SUP>9</SUP> cycles at room temperature under completely reversed loading conditions R=-1. Scanning electron microscopy(SEM) analysis revealed that failures occur right up to the high cycle regime, with the fractures being found to initiate from the surface unlike in EP. In addition, SEM micrographs showed that micro-dimples were transformed. Additionally, this test method can be applicable on commercialized parts of automotive and rail road which are required high cycle fatigue. In addition, SEM micrographs showed that micro-dimples were transformed into EP fracture.