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신승욱,Kyu Ung Sim,문종하,김진혁 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The 3 wt% Ga-doped ZnO (GZO) thin films were prepared on glass substrates by RF magnetron sputtering with different processing parameters such as RF powers, substrate temperatures and Ar working pressures. Crystallinity and electrical properties of GZO films were investigated. The X-ray diffraction results showed that all the GZO films were grown as a hexagonal wurtzite phase with highly c-axis preferred out-of-plane orientation. The electrical properties of GZO films were strongly related to processing parameters. With increasing the processing parameter values, the electrical properties of GZO films were improved up to at 350 ℃, 200Wand 6 mTorr, above that they became worse at 400 ℃ and 7.5 mTorr. The film showed the lowest resistivity of 3.45 × 10-4 Ωcm when the film was prepared in the optimized conditions of processing parameters of 350 ℃, 6 mTorr, and 200 W.
Design Study of a Re-bunching RFQ for the SPES Project
신승욱,A. Palmieri,M. Comunian,F. Grespan,채종서 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.9
An upgrade to the 2nd generation of the selective production of exotic species (SPES) to produce aradioactive ion beam (RIB) has been studied at the istituto nazionale di fisica nucleare − laboratorynazionali di Legnaro (INFN-LNL). Due to the long distance between the isotope separator online(ISOL) facility and the superconducting quarter wave resonator (QWR) cavity acceleratorelineare per ioni (ALPI), a new re-buncher cavity must be introduced to maintain the high beamquality during the beam transport. A particular radio frequency quadrupole (RFQ) structure hasbeen suggested to meet the requirements of this project. A window-type RFQ, which has a highmode separation, less power dissipation and compact size compared to the conventional normal4-vane RFQ, has been introduced. The RF design has been studied considering the requirementsof the re-bunching machine for high figures of merit such as a proper operation frequency, a highshunt impedance, a high quality factor, a low power dissipation, etc. A sensitivity analysis of thefabrication and the misalignment error has been conducted. A micro-movement slug tuner has beenintroduced to compensate for the frequency variations that may occur due to the beam loading, thethermal instability, the microphonic effect, etc.
Measurement of Characteristic of X-band RF Cavity for 6 MeV Electron Linac
신승욱,이승현,오세영,Donghyup Ha,Mitra Ghergherehchi,채종서,이병노,채문식 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.7
A compact 6 MeV electron linear accelerator (linac), intended to be used as an X-ray source for a dual-head gantry radiotherapy system has been developed. In order to meet the size requirements of the dual-head gantry machine, an X-band radio frequency (RF) technology is used, which facilitates a reduction in the size of the linac, which is nine times smaller than the conventional medical purpose linac using S-band RF technology. Nevertheless, the X-band RF technology requires much higher machining precision and higher-quality surface finish owing to the electrical breakdown phenomena resulting from its small size. After the design was completed, the RF cavity was machined using high-precision machining technology, achieving machining tolerances of ±2 μm, and a surface roughness less than 50 nm. Various RF properties were measured in the fabricated RF cavity by using a network analyzer, and the distribution of the electric field generated in the RF cavity was verified by a bead-pull measurement technique. RF conditioning and beam commissioning experiments were performed, following the fabrication and tuning of the RF cavity.
Regional Effects on Chimera Formation in 454 Pyrosequenced Amplicons from a Mock Community
신승욱,이태권,한정민,박준홍 한국미생물학회 2014 The journal of microbiology Vol.52 No.7
Chimeras are a frequent artifact in polymerase chain reaction and could be the underlying causes of erroneous taxonomic identifications, overestimated microbial diversity, and spurious sequences. However, little is known about the regional effects on chimera formation. Therefore, we investigated the chimera formation rates in different regions of phylogenetically important biomarker genes to test the regional effects on chimera formation. An empirical study of chimera formation rates was performed using the Roche GSFLXTM system with sequences of the V1/V2/V3 and V4/V5 regions of the 16S rRNA gene and sequences of the nifH gene from a mock microbial community. The chimera formation rates for the 16S V1/V2/V3 region, V4/V5 region,and nifH gene were 22.1 –38.5%, 3.68–3.88%, and 0.31–0.98%, respectively. Some amplicons from the V1/V2/V3 regions were shorter than the typical length (~7–31%), reflecting in complete extension. In the V1/V2/V3 and V4/V5 regions, conserved and hypervariable regions were identified. Chimeric hot spots were located in parts of conserved regionsnear the ends of the amplicons. The 16S V1/V2/V3 region had the highest chimera formation rate, likely because of long template lengths and incomplete extension. The amplicons of the nifH gene had the lowest frequency of chimera formation most likely because of variations in their wobble positions in triplet codons. Our results suggest that the main reasons for chimera formation are sequence similarity and premature termination of DNA extension near primer regions. Other housekeeping genes can be a good substitute for 16S rRNA genes in molecula rmicrobial studies to reduce the effects of chimera formation.
신승욱,한준희,강명길,윤재호,이정용,김진혁,Shin, Seung-Wook,Han, Jun-Hee,Gang, Myeng-Gil,Yun, Jae-Ho,Lee, Jeong-Yong,Kim, Jin-Hyeok 한국재료학회 2012 한국재료학회지 Vol.22 No.5
Chalcogenide-based semiconductors, such as $CuInSe_2$, $CuGaSe_2$, Cu(In,Ga)$Se_2$ (CIGS), and CdTe have attracted considerable interest as efficient materials in thin film solar cells (TFSCs). Currently, CIGS and CdTe TFSCs have demonstrated the highest power conversion efficiency (PCE) of over 11% in module production. However, commercialized CIGS and CdTe TFSCs have some limitations due to the scarcity of In, Ga, and Te and the environmental issues associated with Cd and Se. Recently, kesterite CZTS, which is one of the In- and Ga- free absorber materials, has been attracted considerable attention as a new candidate for use as an absorber material in thin film solar cells. The CZTS-based absorber material has outstanding characteristics such as band gap energy of 1.0 eV to 1.5 eV, high absorption coefficient on the order of $10^4cm^{-1}$, and high theoretical conversion efficiency of 32.2% in thin film solar cells. Despite these promising characteristics, research into CZTS-based thin film solar cells is still incomprehensive and related reports are quite few compared to those for CIGS thin film solar cells, which show high efficiency of over 20%. The recent development of kesterite-based CZTS thin film solar cells is summarized in this work. The new challenges for enhanced performance in CZTS thin films are examined and prospective issues are addressed as well.
신승욱,박정민,문은아 조선대학교 기초과학연구원 2019 조선자연과학논문집 Vol.12 No.1
Demand response is usually operated through using the power rates and incentives. Demand management based on power charges is the most rational and efficient demand management method, and such methods include rolling base charges with peak time, sliding scaling charges depending on time, sliding scaling charges depending on seasons, and nighttime power charges. Search for other methods to stimulate resources on demand by actively deriving the demand reaction of loads to increase the energy efficiency of loads. In this paper, ESS algorithm for saving energy based on predicting the amount of solar power generation that can be used for buildings with small loads not under electrical grid.