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김명규(Myeong Gyu Kim),이창준(Chang Jun Lee),홍아름(Ah Reum Hong) 한국정보사회학회 2016 정보사회와 미디어 Vol.17 No.1
본 연구는 미디어의 본질인 ‘정보 전달’의 측면에서 효과적인 정보 확산 방법에 대한 연구이다. 특별히 미디어가 직접 이용자에게 정보를 전달하는 것보다 의견지도자라는 매개체를 통해 정보를 전달하는 것이 더 효과적이라는 2단계 유통이론을 기반으로, 미디어의 환경 변화를 반영한 온라인 의견지도력 측정 변수를 정립하여, 온라인 의견지도자를 식별하고 그들의 미디어 이용 패턴을 분석하였다. 요인분석을 이용하여 기존 연구를 바탕으로 새롭게 정의한 온라인 의견지도력 측정 변수를 정립하고, CART 분류 분석을 이용하여 온라인 의견지도력 중 유사한 미디어 이용 패턴을 보이는 자들을 집단화(clustering)하였으며, 미디어 레퍼토리를 유형화하여 미디어 이용 패턴을 분석하였다. 또한, 온라인 의견지도자의 내적, 외적 특성을 통해 기존 의견지도자와의 구분을 시도함으로써 온라인 의견지도자 그룹의 미디어레퍼토리 유형 형태의 차이점이 존재함을 밝혀냈다. 더 나아가, 온라인 의견지도자와 비의견지도자 그룹 간의 미디어 이용 형태를 미디어-시간, 콘텐츠-시간에 따라 분석하였으며, 마지막으로 미디어-콘텐츠-시간 3범주기준을 제시하고 온라인 의견지도자의 미디어 이용 형태를 분석하였다. 본 연구의 결과를 통해 정보 확산 매개체인 의견지도자들의 미디어 이용 패턴 분석을 통해 효과적인 정보 확산을 위한 함의를 제공하고 정보 공급자들에게 효과적인 정보 확산을 위한 미디어 레퍼토리 기반의 미디어 전략을 제안한다. This paper aims to analyze media utilization pattern of the online opinion leader who has an effect in information diffusion. There is a study ‘the two-step flow of communication theory’ about the effect of media related to information diffusion. This study says information delivery through opinion leader is more effective than direct delivery to user. In this perspective, opinion leader can be important medium to effective information diffusion. This paper focuses on 2 main ideas. One is to discern online opinion leader with online opinion leadership’s measuring variables reflected media environment change. The other is to analyze media utilization pattern of the online opinion leader. ‘2013 and 2012 Korea Media Panel Survey’ from KISDI(Korea Information Society Development Institute) is well-fitted data for this study. This data offer personality, media and contents use based on situation variables like ‘when’, ‘where’ and ‘what’. Using KISDI data, the new measuring variables for online opinion leadership are constructed by the factor analysis. The CART algorithm which is one of the classification tools in data-mining is used to classify online opinion leader group has similar media utilization pattern(media repertoires) based on calculated opinion leadership of sample. Then this paper analyzes online opinion leader group’s media use based on media-content-time. Through this analysis, we can investigate the media repertoires of online opinion leader and detailed media utilization pattern based on 3 categories. Using the results, we can take implications to information provider like companies and government for effective information diffusion strategy. Especially for companies, this paper can give implications for media and content strategy in product and service marketing.
Flexible ECA Probe를 이용한 평판 및 용접부 검사
이창준(Chang-Jun Lee),이규성(Kyu Sung Lee),신충호(Chung-Ho Shin),이경준(Kyoung-Jun Lee),장윤영(Yoon Young Jang) 한국비파괴검사학회 2016 한국비파괴검사학회지 Vol.36 No.4
Flexible ECT (eddy current array) probe를 사용하여 판재 및 용접부에 존재하는 notch 결함을 MS-5800E와 OmniScan MX 장비로 검출능력을 비교하고, 주파수와 lift-off를 변수로 신호의 특성을 비교하고자 하였다. 실험 결과, 500, 1000, 1500 kHz를 사용하였을 때 notch 깊이가 증가할수록 신호의 진폭이 증가하는 것으로 나타났고, lift-off 변화에 따른 신호의 진폭은 선형적으로 감소하였다. 또한 용접부 결함은 probe와 시험체의 접촉면에 밀접한 관계가 있다. Probe와 시험체의 접촉면이 양호한 경우 검출감도가 우수하고 그렇지 않은 경우에는 검출감도가 떨어지는 것을 알 수 있었다. This paper aims to compare the ability to detect notch defects existing in the plate and welded area using a flexible ECA (eddy current array) probe with OmniScan MX and MS-5800E. The characteristics of signals with various frequencies and lift-offs were also compared. As a result, when signals of frequencies 500, 1000, and 1500 kHz were used, the amplitude of the signal increased, as the depth of the notch increased, but reduced linearly in accordance with the lift-off variation. In addition, the detection sensitivity of the weld defect was found to be closely related to the contact surface of the probe and specimen. In this paper, it was demonstrated that the detection sensitivity was excellent when the contact surface of the probe and the specimen was sufficient, but it was poor when the contact surface was insufficient.
지능형 컨테이너의 관리를 위한 시뮬레이터의 구현에 관한 연구
이창준(Chang-Jun Lee),김동연(Dong-Yeon Kim),선우주(Woo-Joo Sun),임영준(Young-Jun Lim),박장환(Jang-Hwan Park) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
In this paper, it is a study on intelligent container implementation to utilize Cold Chain in fresh logistics, and an algorithm is implemented to enable control and monitoring by appropriately managing variables such as temperature, illuminance, and vibration using a simulator. In particular, based on the monitoring of such variables, the visualization of container internal state is managed efficiently using graphics representation. Therefore, it is indispensable to utilize OPC UA which facilitates communication through cooperation of variables among different programs and guarantees interoperability. In this paper, we applied OPC UA and managed variables inside the container by using variable.
이창준 ( Lee Chang Joon ),이준철 ( Lee Jun Cheol ),신성우 ( Shin Sung Woo ),김화중 ( Kim Wha Jung ) 한국건축시공학회 2016 한국건축시공학회지 Vol.16 No.5
The evolution of electro-mechanical impedance (EMI) of the piezoelectricity (PZT) sensor was investigated to determine the setting times of cementitious materials in this study. The PZT sensor coated with non-conductive acrylic resin was embedded in cement paste before casting and the EMI signatures were continuously measured. Vicat needle test and semi-adiabatic calorimetry test were also conducted to justify the validity of EMI senssing technique in setting monitoring of cementitious materials. The results show that significant changes in EMI resonant peak magnitude and frequency during setting process were observed, and that the setting times determined by EMI sensing technique were relevant to the setting times measured by Vicat needle test and semi-adiabatic calorimetry test.
이창준,심훈구,김운천,이송희,박형숙,Lee, Chang Jun,Sim, Hun Gu,Kim, Un Cheon,Lee, Song Hui,Park, Hyeong Suk Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.4
We present the results of computer simulation for the steady shear flows of rodlike molecules using nonequi-librium molecular dynamics simulation (NEMD) method. The model particle is a rigid rod composed of lin-early connected 6-sites and the Lennard-Jones 12-6 potential governs interactions between sites in different molecules. The system of rodlike molecules exhibits the change of orientational structure, that is, isotropic-nematic transition at high shear rates. We elucidate the nature of the ordered system developed from an isotro-pic phase by steady shear through an analysis of various quantities: orientational order parameters, orientational pair correlation functions, orientational distribution function, and snapshots of configurations. The effects of temperature and density on the shear rate dependence of orientational structure are described.