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가스안전 상담용 H.263 코덱을 이용한 영상채팅시스템 구현
정애정(Ae Jeong Jeong),박규태(Gyou Tae Park),한상인(Sang In Han),권정락(Jeong Rock Kwon) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
최근 정보통신 기술들이 빠르게 발전하고 있다. 다양한 통신 기술들 증에서도 업무의 효율을 높이고자 회사 및 가정, 학교 등에서 자주 사용되고 있는 영상채팅시스템을 구현해보고자 한다. 퀵타임 코덱 중 가장 보편적인 코덱으로 인코딩이 쉽고 저사양의 CPU만으로도 실시간 스트리밍이 가능한 H.263 코덱을 사용하여 영상채팅시스템을 Visual C++로 구현을 하였다. 전송로의 지연을 줄이기 위하여 영상, 음성, 텍스트 등을 압축하고 복원하는 데 걸리는 시간을 최소화기 위하여 데이터의 전송대역폭을 적절히 조성하는 알고리듬을 제안하여 전송지연을 최소화하였다. 또한 P2P 방식을 사용하여 다양한 영상 환경에 대하여 영상 및 텍스트 데이터의 안정성과 화질이 우수함을 보였으며, 실시간 가스안전관리 상담에 이용하여 업무의 효율을 높이고자 한다.
MAGNETIC RESONANCE ELECTRICAL IMPEDANCE TOMOGRAPHY
Kwon, Oh-In,Seo, Jin-Keun,Woo, Eung-Je,Yoon, Jeong-Rock Korean Mathematical Society 2001 대한수학회논문집 Vol.16 No.3
Magnetic Resonance Electrical Impedance Tomography(MREIT) is a new medical imaging technique for the cross-sectional conductivity distribution of a human body using both EIT(Electrical Impedance Tomography) and MRI(Magnetic Resonance Imaging) system. MREIT system was designed to enhance EIT imaging system which has inherent low sensitivity of boundary measurements to any changes of internal tissue conductivity values. MREIT utilizes a recent CDI (Current Density Imaging) technique of measuring the internal current density by means of MRI technique. In this paper, a mathematical modeling for MREIT and image reconstruction method called the alternating J-substitution algorithm are presented. Computer simulations show that the alternating J-substitution algorithm provides accurate high-resolution conductivity images.
A Novel Substrate of Mammalian Thioredoxin Reductase 1
Jeong, Woojin,Yoon, Hae Won,Kim, Jae-Ryong,Kwon, Ki-Sun,Lee, Seung-Rock,Kwon, Jaeyul,Rhee, Sue Goo 이화여자대학교 세포신호전달연구센터 2001 고사리 세포신호전달 심포지움 Vol. No.3
Recent evidence suggests that a number of proteins are oxidized at their critical cysteine residues as the result of receptor-mediated H₂O₂ production. At the present time, the reduction of these oxidized proteins is thought to be achieved by general electron suppliers such as Trx, Grx and GSH. Evidence(e.g., Trx reduces oxidized Prx Ⅰ-Ⅴ enzymes but not oxidized Prx Ⅵ; Trx, but not Grx or GSH, reduces oxidized PTP1B), however, suggests that the reduction reaction might be governed by specific interactions between the donor and acceptor molecules. Signal transduction paradigms instruct us that both modification and demodification of proteins are controlled processes. As such, we searched new electron donor molecules and found several small proteins containing a CysXXCys(or CysXXSeCys) motif, which is conserved among the members of the thiol-disulfide oxidoreductase superfamily that includes Trx and Grx. One of these is a 14-kDa protein, which we named Trx-related protein 14(TRP14). Its overall similarity to Trx is low(<20%). The homology search showed that TRP14 homologs exist in a wide range of organisms from bacteria to mammals. Immunoblot analysis indicates that TRP14 is a ubiquitous protein like Trx. TRP14 was expressed at much lower levels than Trx in every tissue examined except in kidney. The reduction potentials were similar for TRP14(-0.257V) and Trx(-0.274V). Studies with mutant proteins in which the two conserved cysteine residues(Cys43 and Cys46) were altered and direct analysis of the Cys-containing peptides revealed that, as in the case of Trx, the conserved cysteine residues form an intramolecular disulfide linkage upon oxidation by hydrogen peroxide. The resulting disulfide could be reduced by TrxR1 but not by TrxR2, whereas Trx is an equally good substrate for TrxR1 and TrxR2. For the reduction reaction by TrxR1, TRP14 was a better substrate than Trx. Trx serves as a hydrogen donor for the catalytic function of ribonucleotide reductase, methionine sulfoxide reductase, and peroxiredoxins. TRP14 could not support any of these three reactions. This substrate specificity, although surprising in view of their similar reduction potentials, suggests that specific protein-protein interactions or the pKa values of the conserved cysteine residues, in addition to reduction potential, may govern the electron flows from Trx and Trx-like proteins to acceptor proteins. To search for proteins that depend on TRP14 for the supply of reducing equivalents, GST-TRP14 fusion protein was immobilized to Sepharose gels. TrxR1 was found to bind specifically to the TRP14-bound Sepharose column. Our results suggest that TRP14 is a disulfide-oxidoreductase that is capable of receiving electrons from NADPH via TrxR1. The downstream targets of TRP14 in the reduction cascade remain to be identified.
Rock-Kil Ko,O-Jong Kwon,Kyu-Jeong Song,Ahmad, D.,Chan Park,Joon-Ho Lee,Seung-Su An,Nam-Jin Lee,Sang-Soo Oh,Young-Cheol Kim Institute of Electrical and Electronics Engineers 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>TmBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> films which is one of the (Rare earth)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7</SUB> <SUB>-</SUB> <SUB>x</SUB> high temperature superconductors with small ionic radius of rare earth element, were deposited on STO (100) single crystal substrates and Y<SUB>2</SUB>O<SUB>3</SUB>/YSZ/CeO<SUB>2</SUB> buffered metal substrates by pulsed laser deposition. The J<SUB>c</SUB> (77 K) and the value of onset of Tc TmBCO thin film on STO substrate was 4.5 MA/cm<SUP>2</SUP> and 86 K, respectively. The of J<SUB>c</SUB> TmBCO coated conductor on metal substrate was 1 MA/cm<SUP>2</SUP> . In-field property measurement was carried out at temperatures between 10 K and 77 K in magnetic filed up to 6 T in PPMS system. This is the first report, to the best of our knowledge, of TmBCO thin films and coated conductors with TmBCO film as the superconducting layer which have critical current densities at 77 K of 4.5 MA/ cm<SUP>2</SUP> and 1 MA/cm<SUP>2</SUP> , respectively. The superconducting properties of TmBCO films and the possibility of using TmBCO film as the superconducting layer of the HTS coated conductor, were investigated.</P>
유비쿼터스 도시가스 인프라 내의 CDMA 노출배관 모니터링 시스템 개발 및 최적화
오정석 ( Jeong Seok Oh ),박장식 ( Jang Sik Park ),권정락 ( Jeong Rock Kwon ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2
도시가스 배관에서 노출배관 위험요소에 대한 모니터링이 필요하나 현재는 인위적으로 사람에 의해 확인하거나 유선 기반의 감시 시스템이 존재한다. 이에 대한 제반 비용을 감소시키면서 무선 기반의 감시 인프라를 구축하기 위해 본 연구에서는 노출배관의 위험요소 중에서 가장 중용한 응력과 진동을 측정하고 CDMA 방식을 이용하여 모니터링 시스템에 전달해주는 시스템을 구축하며 실제 환경에서 시험환경(Test-bed)을 조성하여 대상 시설 및 설치 환경에 따라 최적화된 기기 및 인프라를 구축하는 것을 본 연구에서 기밸반된 도시가스 안전 유비쿼터스 인프라에 통합시키는 것을 목적으로 한다.