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Characteristics of ZnO Films Deposited on Plastic Substrates at Various RF Sputtering Powers
J. J. Kim,이종훈,J. Y. Lee,D. J. Lee,B. R. Jang,김홍승,W. J. Lee,조채용,J. H. Kim 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5
Zinc-oxide (ZnO) films were deposited on polycarbonate (PC) and polyethersulfhone (PES) substrates by RF sputtering at room temperature. We investigated the effect of sputtering power (range: 100–200 W) on the structural, optical, and electrical properties of the deposited ZnO films. X-ray diffraction measurements revealed that the ZnO films deposited on both substrate types had a (002) preferred orientation associated with the hexagonal phase. While the ZnO film with the optimal structural properties was obtained at a sputtering power of 175 W, films deposited at powers around 100 W showed a stable optical transmittance of over 85 % over the visible range and linear electrical conductance.
이준범,Lee Byoung-hee,박정준,Hong Jeong In,Lee Dae-Weon 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
The tobacco whitefly, Bemisia tabaci (Hemiptera: Aleyrodidae), is a serious pest that transmits tomato yellow leaf curl virus (TYLCV) in tomato. The tobacco whitefly exhibits morphological similarity with the greenhouse whitefly, Trialeurodes vaporariorum (Hemiptera: Aleyrodidae) which also damages various plants in the green house. Therefore, it is very important to quickly and accurately diagnose whiteflies for applying pest manage ment strategies. In this study, we used a loop-mediated isothermal amplification (LAMP) assay to quickly and effectively detect B. tabaci. Primer sets were investigated for the specificity of B. tabaci by visible detection of the target DNA fragment. Two primer sets for pheromone biosynthesis activating neuropeptide (PBAN) gene were obtained from transcriptomic analysis of B. tabaci biotype Q. The PBAN-based LAMP primer set showed specific amplification of the target region. The optimal conditions for B. tabaci detection were 60 ◦ C for 60 min with four LAMP primers of PBAN. The minimum amount of genomic DNA required for visible detection was 100 ng. These results suggest that the PBAN-based LAMP assay can be applicable for field monitoring of B. tabaci.
김석준(S.J. Kim),김욱중(O.J. Kim),이정호(J.H. Lee),최항석(H.S. Choi),정경열(K.Y. Jeong),이성수(S.S. Lee),이종훈(J.H. Lee),김성민(S.M. Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
Domestic gas boilers with high thermal efficiency and low concentration of CO and NOx in exhaust gas were developed in cooperation with several research institutes, universities, and companies. Integration and performance test results of the boiler systems will be presented in this paper, on the other hand development results of core parts like burners, heat exchangers and blowers in the boilers in others. The results showed both developed boilers with rectangular or cylindrical type of heat exchanger satisfied project objectives of thermal efficiency over 90% (SEDBUK, class A), NOx concentration of 50 ppm, and CO concentration of 40 ppm.
이종훈(J. H. Lee),이연원(Y. W. Lee),김재환(J. H. Kim) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In the technical development of automobiles, environmental effort is risen with air pollution problem. Hydrocarbon (HC), one of dangerous pollutants in automobiles, is generated about 20~35% in total amount by crankcase blowby gas. A PCV valve eliminates this gas using recirculation loop to control it automatically using return spring. The PCV valve is very small component in an automotive engine but it is very important. Although it has very simple operating principle such as the spool is moved by force balance between fluid force and elastic force, designing a PCV valve is difficult for interaction between fluid and solid. In this study, our purpose is to develop a design program for PCV valve and we verify its efficiency. We used both Euler's equation and 4th order Runge-Kutta method to predict spool displacements and flow areas. Comparing with real products, we found that both spool diameter and displacement were predicted well. But, in comparison with flow rate we could found its difference because of the assumption of non viscous flow, that is Euler's equation.