• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.1089-1094
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• 2005

Peterson and Mahajan(1978)은 Bass모형을 확장한 종속적 신상품 수요확산모형(contingent diffusion model)을 처음으로 제안하였다. Peterson and Mahajan(1978)이 명명한 상품간의 종속적(contingent) 관계란, 주 상품의 경우는 다른 상품에 독립적이지만 종속적 상품(contingent product)의 경우는 잠재시장이 주 상품의 누적 구매자 수에 의존하는 경우를 말한다. 그런데 Peterson and Mahajan이 제안한 기존 모형은 실질적 활용에 있어서 모형 추정이 불가능하다는 단점을 지니고 있을 뿐만 아니라, Bass(1969) 모형처럼 엄밀한 확률이론에 근간을 둔 모형이라기보다는 직관과 통찰력에 근간을 둔 Bass모형의 단순한 확장 모형이라는 한계를 지니고 있다. 본 연구는 이러한 한계를 극복하고 확률이론을 바탕으로 종속적 관계를 가지는 상품들에 대한 수요 확산모형을 개발하는데 목적이 있다. Bass의 신상품확산모형은 hazard 함수 모형의 일종으로 신상품의 확산을 혁신과 구전효과로 설명한 과학적 모형이다. 본 연구에서는 확률이론을 활용함으로써 이러한 Bass의 hazard 함수 모형의 확장이 가능함을 보이고, 이를 토대로 종속적 관계에 있는 신상품들에 대한 수요 확산모형을 개발하였다. 또한 개발된 모형을 한국의 이동전화와 무선인터넷 사례에 적용하여 실증 분석을 수행하였다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2001.11a
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• pp.138-143
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• 2001

본 연구에서는 생환공간에서의 음향감성을 평가하기 위하여 긍정감성을 유발하는 음환경으로서 '명상음악'과 부정감성을 유발하는 음환경으로서 '헬리콥터소음'과 '마루가 삐거덕거리는 소음'을 제시하였을 때 행동활성화체계(BAS)와 행동억제체계(BIS)의 민감성이 서로 다른 집단들을 대상으로 전전두엽의(PFC) 비대칭성과 심장박동율변동성(HRV)을 분석하였다. 연구결과, 명상음악을 청취시에는 안정상태에 비하여 좌측전두엽이 더 활성화되고 HRV의 LF/HF는 감소된 반면에 소음환경에서는 우측전두엽이 더 활성화되고 LF/HF는 더 증가하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2006.11a
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• pp.336-339
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• 2006

With the steady depletion off fossil fuel reserves, hydrogen based energy sources become increasingly attractive. Therefore hydrogen production or separation technologies, such as Bas separation membrane based on adsorption technology, have received enormous attention in the industrial and academic fields. In this study, the transport mechanisms of the MTES (methyltriethoxysilane) templating silica/a-alumina composite membrane were evaluated by using unary, binary and quaternary hydrogen gas mixtures permeation experiments at unsteady- and steady-states. Since the permeation flux in the MTES membrane, through the experimental and theoretical study, was affected by molecular sieving effects as well as surface diffusion properties, the kinetic and equilibrium separation should be considered simultaneously in the membrane according to molecular properties. In order to depict the transient multi-component permeation on the templating silica membrane, the GMS (generalized Maxwell-Stefan) and DGM (dust Bas model) were adapted to unsteady-state material balance

• Korean Journal of Child Studies
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• v.28 no.4
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• pp.113-126
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• 2007

This study explored mediating effects of the maternal emotional expressiveness between maternal behavioral inhibition/behavioral activation system and children's emotional intelligence. subjects were 138 4- to 5-year-old preschoolers (92 boys, 46 girls) and their mothers. The maternal behavioral inhibition/behavioral activation system was measured by BIS/BAS(Behavioral Inhibition System/Behavioral Activation System, Carver & White, 1994), maternal emotional expressiveness was measured by the Self-Expressiveness in the Family Questionnaire (Halberstadt, 1995), and children's emotional intelligence was measured by the Emotional Intelligence Questionnaire (Lee, 1998). Data were analyzed by descriptive statistics and multiple regression analysis. Results were that maternal positive expressiveness mediated the effects of maternal BIS on children's self-understanding and maternal negative expressiveness mediated the effects of maternal BAS on children's self-regulation.

• Proceedings of the KSME Conference
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• 2001.11b
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• pp.229-234
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• 2001

The thermoacoustic refrigerator bas not only considerable possibility but also commercial usability, because it bas high reliability, lower vibration, no moving part, and can easily be constructed. In this study, the resonance characteristics of the thermoacoustic refrigerator were investigated for better performance, varying length of the resonance tube to 400mm, 500mm, 600mm, 700mm. In order to determine the optimum resonance tube length and the frequency, the $\lambda/4$ thermoacoustic engine and the similar apparatus of Wheatly type refrigerator were constructed. It was used air as a coolant. in the fifth harmonic, it was taken the highest ${\Delta}t$ that was $56.3^{\circ}C$ at 626Hz in 400mm tube with 40mm stack.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.4
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• pp.48-56
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• 2000

This paper proposes the new concept & design method and implementation of LonWorks network system for telemetry & remote monitoring and control in BAS. In order to apply this open system, the essential components of Lonworks is analyzed and a new concepts of its design method is proposed. In our experiment, Lonworks network system for telemetry & remote monitoring and control of lighting are designed and fabricated. As a result, it is verified that LonWorks is open, interoperable, reliable network system from the experimental results, especially, node development, network configuration & design, secure communication and MMI.

• Journal of Institute of Control, Robotics and Systems
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• v.8 no.11
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• pp.935-940
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• 2002

For robot navigation and visual reconstruction, structure from motion (SFM) is an active issue in computer vision community and its properties arc also becoming well understood. In this paper, when using stereo image sequence and direct method as a tool for SFM, we present a new method for overcoming bas-relief ambiguity. We first show that the direct methods, based on optical flow constraint equation, are also intrinsically exposed to such ambiguity although they introduce robust methods. Therefore, regarding the motion and depth estimation by the robust and direct method as approximated ones. we suggest a method that refines both stereo displacement and motion displacement with sub-pixel accuracy, which is the central process f3r improving its ambiguity. Experiments with real image sequences have been executed and we show that the proposed algorithm has improved the estimation accuracy.

• Proceedings of the SAREK Conference
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• 2004.06a
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• pp.206-206
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• 2004

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.25 no.4
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• pp.304-314
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• 1996

• Journal of Korean Elementary Science Education
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• v.34 no.1
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• pp.86-94
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• 2015

This study is to investigate how do elementary students' eye movements appear in cognitive process that they perceive science learning materials depending on motivation system of science learning. For this study we had a random sampling of 301, 6th grade students. And we had selected 32 students through the three tests for the final; motivation system test of science learning, a learning styles test, an Edinburgh inventory for handedness test. We were analysis the cognitive process during learning tasks for the selected student using eye-tracking equipment. The results of the research are as follows: First, when students see a science learning material, we found out that SL-BAS group that has tendency searched various areas than SL-BIS group in learning task. Second, results confirmed through the data of integrational count that students looked alternately texts, images and graphs in the learning material, SL-BIS group were more than SL-BAS group on integrated count, but they had a simple and insignificant eye movement. Especially SL-BAS students showed that integrated eye movement between texts, images and graphs in the learning material, and they explored important areas of the graph compared with SL-BIS group that there was no eye movement in graph. These results may be utilized as a useful resource for designing students' learning.