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고진공 주사탐침열파현미경을 이용한 Bi₂Te₃ 나노선의 열전도도 계측
박경배(Kyungbae Park),황광석(Gwangseok Hwang),김하영(Hayeong Kim),김정원(Jungwon Kim),권오명(Ohmyoung Kwon),김성진(Sungjin Kim),김우철(Woochul Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
We develop the thermal characterization technique for measuring the thermal conductivity of the nanomaterials by utilizing the High Vacuum Scanning Thermal Wave Microscopy(HV-STWM), which enables to measure the phase lag and amplitude of thermal waves quantitatively with nanoscale spatial resolution in a high vacuum environment. The HV-SWTM measurement method obtains the thermal conductivity by measuring the thermal diffusivity, which has only a phase lag relative to the distance corresponding to the transferred thermal wave. It is not affected by the thermal contact resistances between the heat source and nanostructure and between the nanostructure and probe. In this study, we quantitatively measure the thermal conductivity of the Bi₂Te₃ nanowire(1.47 W/mK), with the newly developed thermal characterization method based on HV-STWM.
4차 산업혁명과 환경 친화적 교통 산업 발전 전략과 정책
박경배 ( Park Kyungbae ) 한국시스템다이내믹스학회 2020 한국시스템다이내믹스 연구 Vol.21 No.3
The purpose of this paper is to review and study policy and strategy for 4th industrial revolution and eco-friendly transportation. First, meaning and definition of the 4th industrial revolution are studied and reviewed. And then, the current and upcoming revolutions in transportations in the era of the 4th industrial revolution are deeply investigated and researched. How system dynamics approach can be used and utilized in the study of the 4th industrial revolution and eco-friendly transportation are main purpose of this research. This study reviews important and significant related researches that have employed system dynamics approach in investigating the 4th industrial revolution and related innovations and developments in eco-friendly transportation and whole transportation sector. Especially, the study focuses on development strategy and policy to nurture new transportation industries based on 4th industrial revolution. As results, this study shows usefulness and current and potential contributions of the system dynamics approach in investigating upcoming huge technological innovations, those are the 4th industrial revolution, and the related innovations in many important sectors such as transportations and eco-friendly industries.
최진호,정선양,박경배,장대철,조형례,강승규,Choi, Jinho,Chung, Sunyang,Park, Kyungbae,Jang, Dae-Chul,Cho, Hyeongrye,Kang, SeungGyu 기술경영경제학회 2014 Journal of Technology Innovation Vol.22 No.3
전 세계적으로 기후변화와 저탄소 소비행태를 향한 움직임이 일어남에 따라 이에 대한 대처가 요구되고 있으며, 국제적인 유가상승은 그린카에 대한 소비자들의 니즈를 촉발시키고 있다. 본 논문은 그린카 산업 플랫폼 구축 정책과 기업전략을 도출하기 위한 선행연구로서 이를 위해 정책프레임 및 실증분석, 개념적/수리적 모델링, 시스템 다이내믹스, ABM 등의 다양한 방법론을 사용하여 다각적으로 접근, 통합하여 플랫폼 관점에서의 학제적 연구 프레임워크를 제시하고자 한다. 먼저 그린카 사례 분석을 위한 산업플랫폼 분석 프레임워크를 도출하고, 필요한 구성 요소들을 제시하였으며 계량경제학 모형을 적용하여 그린 플랫폼(양면시장)에 관련된 기본 모델을 수립하였다. 또한 동태적인 관점에서의 분석을 위해 시스템 다이내믹스 모형을 그린카 환경에 접목하여, 특정 그린카 산업분석에 적용할 수 있는 시스템 다이내믹스 분석 모델을 수립하였다. 마지막으로 보다 미시적 관점에서 한국의 하이브리드 자동차 시장의 활성화 방안에 대하여 ABM을 이용하여 개별 소비자 관점에서 연구하였다. 이를 기반으로 현 한국시장에서 실행 중 혹은 실행 예정인 하이브리드 자동차 정책에 대한 분석 방안을 제시하였다. Climate change and low-carbon consumer movement is demanding proper response around the world while rising oil price increases consumers' needs for green car. As a preliminary study to establish an industrial platform for green car and bring out corporate strategies, this article aims to propose an academic research framework by using various methodologies including conceptual/mathematical modeling, system dynamics, and ABM from different angles. First, an analysis framework for the industrial platform was introduced to analyze green car cases, required elements were proposed, and econometrics was applied to build a basic model related to green platform (two-sided market). Also, to analyze from a dynamic perspective, a system dynamics model was applied to green car environment to build a system dynamics analysis model that is applicable to particular green car industry analysis. Lastly, an agent based model was used to study the way to activate the hybrid car market in Korea from individual consumers' perspective. Based on the result, vehicle policies that are either being enforced or planned to be enforced in the Korean HEV market can be analyzed.
조정호,이중재,배승환,이용기,박경배,김용준,이준경,Cho, Jungho,Lee, Jungjae,Bae, Seunghwan,Lee, Yongki,Park, Kyungbae,Kim, Yongjun,Lee, Junkyung 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.2
Cleaning effect is well known mechanism of oxide layer removal in DCEP polarity. It is also known that DCEN has higher heat input efficiency than DCEP in GTAW process. Based on these two renowned arc theories, conventional variable polarity arc for aluminum welding was set up to have minimum DCEP and maximum DCEN duty ratio to achieve the highest heat input efficiency and weldability increase. However, recent several variable polarity GTA research papers reported unexpected result of proportional relationship between DCEP duty ratio and heat input. The authors also observed the same result then suggested combination of tunneling effect and random walk of cathode spot to fill up the gap between experiment and conventional arc theory. In this research, suggested combinational work of tunneling effect and rapid cathode spot changing is applied to another unexpected phenomena of variable polarity aluminum arc welding. From previous research, it is reported that wider oxide removal range, narrower bead width and shallower penetration depth are observed in thin oxide layered aluminum compared to the case of thick oxide. This result was reported for the first time and it was hard to explain the reason at that time therefore the inference by the authors was hardly acceptable. However, the suggested combinational theory successfully explains the result of the previous report in logical way.