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Hong, Seokkyoon,Park, Junyong,Jeon, Seong Gi,Kim, Kisun,Park, Sun Hwa,Shin, Ho Sun,Kim, Bumsoo,Jeon, Seokwoo,Song, Jae Yong Royal Society of Chemistry 2017 Journal of Materials Chemistry C Vol.5 No.35
<▼1><P>We newly propose a periodic 3D nanostructure to reduce the thermal conductivity of Bi1.5Sb0.5Te3 ternary alloys, which results in a greatly enhanced figure of merit (>50%).</P></▼1><▼2><P>The selective reduction of thermal conductivity while preserving the Seebeck coefficient and electrical conductivity is regarded as a key strategy for achieving the high dimensionless figure-of-merit (<I>ZT</I>) of thermoelectric materials. Here, we newly propose a periodic three-dimensional (3D) nanostructure that has an ability to significantly reduce thermal conductivity, resulting in an improved <I>ZT</I> value of thermoelectric materials near room temperature. A 3D nanostructured thermoelectric monolith is developed by electrochemical deposition of a Bi–Sb–Te ternary alloy into a highly ordered, interstitial porous network in an epoxy template predefined by advanced lithography. The resultant inch-scale, bicontinuous nanocomposite monolith released from a substrate can be easily transferred to a customized reliable platform for evaluating thermoelectric properties. The measured thermal conductivity is only ∼0.89 W mK<SUP>−1</SUP> at 350 K due to greatly increased phonon boundary scattering without any degradation in the Seebeck coefficient and electrical conductivity, leading to an enhanced <I>ZT</I> value (∼0.56) which is ∼50% higher than that of an ordinary film with the same elemental composition. The 3D nanostructure developed here will provide new design opportunities for nanostructured thermoelectric materials, potentially usable in flexible thermoelectric coolers and wearable energy harvesting systems.</P></▼2>
이석우,류광열,홍원표,강은구,최헌종 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
국내 제조업은 국가 경제에 중추적인 기여를 하는 분야이다. 제조업의 뿌리이자 기둥인 국내 중소 제조기업들은 급변하는 글로벌 제조환경의 변화 속에서 경쟁력을 갖추기 위해 많은 노력들을 하고 있다. 그러나 국내ㆍ외 환경의 격렬한 변화와 구조적ㆍ기술적 취약성으로 인해 많은 어려움을 겪고 있는 실정이며, 이러한 상황에 대처하고자 정부에서는 2004년부터 전통 제조업에 IT기술을 접목한 e매뉴팩처링을 추진하여 여러 측면에서 좋은 성과를 거두었다. e매뉴팩처링 사업의 성과를 산업 전반으로 확산하고 협업을 지원하는 연구개발을 연계하여 국내제조업이 글로벌 경쟁력을 가진 고부가가치 선진 산업구조로 전환되도록 다양한 혁신정책을 일관성 있게 추진하고자 2007년부터는 기존의 e매뉴팩처링 사업영역을 확대하여 i매뉴팩처링(한국형 제조혁신)사업을 추진하게 되었다. 본 논문에서는 이러한 i매뉴팩처링 사업의 추진전략 및 구체적인 실행방안에 대해 논해보고 이에 따른 기대효과를 설명하도록 한다.
이석우(Seokwoo Lee),류광열(Kwangyeol Ryu),남성호(Sungho Nam),홍원표(Wonpyo Hong),최헌종(Honzong Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Unpredictable customer demands make manufacturers to make quality products with cheaper price and shorter delivery. To survive in the global market, the manufacturing industry needs to equip with advanced technologies including IT. Under this situation, collaborationis the best solution for manufacturers to survive and to grow their company instead of competition. With this strategy, we have conducted a project(e-Manufacturing). The companies participate to the project attained the amazing results by utilizing collaboration systems such as delivery shortened and increase in sale/profit. Since the strategy of the project is assessed to be very useful to increase competition power of manufacturers, the project will be enlarged to cover wider application domains with a new project name called i-Manufacturing. In this paper, therefore, we introduce the specific output from the e-Manufacturing project and the specific strategies/plans of i-Manufacturing project.