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전상구(Sang-Gu Jeon),장훈식(Hoon-Sik Jang),권오헌(Oh-Heon Kwon),남승훈(Seung-Hoon Nahm) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The bending test of an individual ZnO nanorod was performed with a nano-manipulator and a force sensor inside the scanning electron microscope (SEM), and the bending properties of ZnO nanorod were also discussed. The ZnO nanorod used in this experiment was fabricated by means of solution base process. The force sensor used for bending test of ZnO nanorod was typed with cantilever. The force sensor was mounted on the nano-manipulator. The nano-manipulator was controlled and manipulated by a personal computer. The each end of an individual ZnO nanorod was attached on the rigid support and the tip of the force sensor with an electron beam exposure, and then the bending test was carried out by controlling of the nano-manipulator. The bending modulus of a ZnO nanorod was calculated at 69.35㎬ after the bending test.
나노조작기를 이용한 ZnO 나노막대의 기계적 물성 평가
전상구(Sang-gu Jeon),장훈식(Hoon-sik Jang),남승훈(Seung-hoon Nahm),백운봉(Un-bong Baek),박종서(Jong-seo Park),이윤희(Yun-hee Lee),나호준,권오헌(Oh-heon Kwon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Tensile and bending test of a ZnO nanorod was performed in the scanning electron microscope (SEM). The mechanical properties of the ZnO nanorod were also evaluated. The force sensor was cantilever type and was mounted on the nano-manipulator, The nano-manipulator was controlled by personal computer. An individual ZnO nanorod was attached on the rigid support and force sensor by electron beam exposure and then mechanical test was performed. After mechanical test, the area of a ZnO nanorod was also observed by transmission electron microscope (TEM) and SEM. From the TEM and SEM result, cross-sectional area was estimated and elastic modulus of a ZnO nanorod could be calculated. The mechanical strength and the elastic modulus of a ZnO nanorod were obtained.
전상구(Sang-Gu Jeon),장훈식(Hoon-Sik Jang),권오헌(Oh-Heon Kwon),남승훈(Seung Hoon Nahm) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.2
다양한 분야에 활용이 가능한 나노소자의 개발과 나노소자의 수명 및 신뢰성을 결정하기 위해서 나노구조체의 역학물성 측정은 중요하다. 본 연구에서는 다중벽탄소나노튜브(MWCNT)와 산화아연나노막대(ZnO nanorod)의 인장시험을 전자주사현미경(SEM) 내부에서 수행하였다. 챔버내부에 구축된 나노조작기 앞에 힘센서가 장착되었고, 나노조작기는 조이스틱과 컴퓨터로 제어 가능하도록 설계되었다. 반으로 자른 투과전자현미경(TEM)그리드 위에 분산된 나노구조체는 전자주사를 통하여 힘센서와 고정된 후 인장시험이 수행되었다. 인장시험 후 TEM과 SEM을 통하여 파단면을 측정하였고 MWCNT와 ZnO nanorod의 탄성계수는 0.98TPa, 55.85㎬로 각각 측정되었다. It is important to measure the mechanical properties of nanostructures because they are required to determine the lifetime and reliability of nanodevices developed for various fields. In this study, tensile tests for a multi-walled carbon nanotube (MWCNT) and a ZnO nanorod were performed in a scanning electron microscope (SEM). The force sensor was a cantilever type and was mounted in front of a nanomanipulator placed in the chamber. The nanomanipulator was controlled using a joystick and personal computer. The nanostructures dispersed on the cut area of a transmission electron microscope (TEM) grid were gripped with the force sensor by exposing an electron beam in the SEM; the tensile tests were the performed. The in situ tensile loads of the nanostructure were obtained. After the tensile test, the cross-sectional areas of the nanostructures were observed by TEM and SEM. Based on the TEM and SEM results, the elastic modulus of the MWCNT and ZnO nanorod were calculated to be 0.98 TPa and 55.85 ㎬, respectively.
신대현(Shin, Dae-Hyun),전상구(Jeon, Sang-Gu),김광호(Kim, Kwang-Ho),이경환(Lee, Kyong-Hwan),노남선(Roh, Nam-Sun),이기봉(Lee, Ki-Bong) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Since late of 2000, KIER has developed a novel pyrolysis process for production of fuel oils from polymer wastes. It could have been possible due to large-scale funding of the Resource Recycling R&D Center. The target was to develop an uncatalyzed, continuous and automatic process producing oils that can be used as a fuel for small-scale industrial boilers. The process development has proceeded in three stages bench-scale unit, pilot plant and demonstration plant. As a result, the demonstration plant having capacity of 3,000 tons/year has been constructed and is currently under test operation for optimization of operation conditions. The process consisted of four parts ; feeding system, cracking reactor, refining system and others. Raw materials were pretreated via shredding and classifying to remove minerals, water, etc. There were 3 kind of products, oils(80%), gas(15%), carbonic residue(5%). The main products i.e. oils were gasoline and diesel. The calorific value of gas has been found to be about 18,000kcal/m³ which is similar to petroleum gas and shows that it could be used as a process fuel. Key technologies adopted in the process are 1) Recirculation of feed for rapid melting and enhancement of fluidity for automatic control of system, 2) Tubular reactor specially-designed for heavy heat flux and prevention of coking, 3)Recirculation of heavy fraction for prevention of wax formation, and 4) continuous removal & re-reaction of sludge for high yield of main product (oil) and minimization of residue. The advantages of the process are full automation, continuous operation, no requirement of catalyst, minimization of coking and sludge problems, maximizing the product(fuel oil) yield and purity, low initial investment and operation costs and environment- friendly process. In this presentation, background of pyrolysis technology development, the details of KIER pyrolysis process flow, key technologies and the performances of the process will be discussed in detail.
폐합성수지(廢合成樹脂)류의 열분해(熱分解) 유화(油化) 기술(技術) 동향(動向)
신대현,노남선,김성수,김광호,전상구,Shin, Dae-Hyun,Nho, Nam-Sun,Kim, Sung-Soo,Kim, Kwang-Ho,Jeon, Sang-Gu 한국자원리싸이클링학회 2010 資源 리싸이클링 Vol.19 No.1
최근 정부의 저탄소 녹색성장 정책, 신재생에너지의무할당제(RPS)의 시행 추진, 국제 유가의 지속적인 상승 등으로 인해 폐자원 에너지화에 대한 관심이 높아지고 있다. 이와 관련하여 에너지를 많이 소비하는 업계에서는 폐기물 고형연료의 사용을 추진하고 있고, 특히, 폐플라스틱의 열분해유화기술은 중소, 중견기업들이 국내에서 개발된 기술의 상용화를 적극적으로 검토하고 있다. 본 논문에서는 폐플라스틱 열분해 기술의 소개와 폐플라스틱 자원, 기술 개발 및 상업화 등에 대하여 국내의 현황을 소개하였다. Recently, the waste energy utilization has become the main interest in energy industries, due to high oil prices, the low carbon, green growth policy and the RPS (Renewable Portfolio Standards) of our government. Therefore, energy guzzling companies such as district heating companies, textile industries are replacing energy to RDP/RPF. Especially, a lot of big companies are carrying out survey to commercialize the waste plastics pyrolysis technologies developed in Korea. In this paper, status of the pyrolysis technology of Korea were reviewed overall including basis of technology, waste plastics resources, research & development, and commercialization.
PVC 함유 폐합성수지의 열분해에서 염소성분의 거동 특성
신대현(Dae-Hyun Shin),노남선(Nam-Sun Roh),이경환(Kyong-Hwan Lee),김광호(Kwang-Ho Kim),전상구(Sang-Gu Jeon) 한국열환경공학회 2009 한국열환경공학회 학술대회지 Vol.2009 No.춘계
It is well-known that PVC s contained in wastes is a troublesome matter in the processes of incineration and recycling etc. because of Cl component giving serious pollutants such HCl gas, dioxin etc. In pyrolysis process, it also causes the problems of corrosion, emission of HCl/dioxin through flue gas, as well as Cl content in oil products In this study, TG analysis and basic pyrolysis experiments were carried out with pure PVC and PVC-based wastes at various temperatures ranges. The tests results were discussed related to pyrolysis processes and the results in a commercial plant were discussed together