• Korean Chemical Engineering Research
• /
• v.47 no.1
• /
• pp.11-16
• /
• 2009

Composite electrodes for redox supercapacitor were prepared potentiodynamically by the deposition of $RuO_2$ and the co-deposition of Ru-Co mixed oxide on the surface of single-walled carbon nanotube. Electrode of Ru-Co mixed oxide, in which Ru(13.13 wt%) and Co(2.89 wt%) were deposited on the carbon nanotube, exhibited a similar specific capacitance(${\sim}620\;F\;g^{-1}$) with $RuO_2$ electrode at a low potential scan rate($10\;mV\;s^{-1}$), but showed a superior one ($570\;F\;g^{-1}$) at a high scan rate($500\;mV\;s^{-1}$) than that of $RuO_2$($475\;F\;g^{-1}$). Such increase in the specific capacitance at high scan rate by the co-deposition of Ru and Co species was due to the structural support of Co species to provide the electronic conduction through Ru species.

• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.1612-1613
• /
• 2011

초고압 XLPE 케이블용 접속재는 고도의 신뢰성과 안정성이 요구되며, 국내외적으로 제품 경량화, 시공 공정 단순화 등 고객의 다양한 요구가 점차 증가하는 추세이다. 당사는 220kV 1C${\times}$2000SQ XLPE 케이블 접속재인 EB-G(가스중 종단접속함)를 Slip-on Type으로 적용함으로써 고객의 요구에 맞춰 단순한 내부절연구조에서 비롯되는 전기적 특성의 안정성과 신속한 시공성을 확보하게 되었다. 본고에서는 220kV급 접속재인 가스중종단접속함(EB-G)의 설계, 개발시험에 관하여 소개하고자 한다.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1435_1437
• /
• 2009

Recently, Due to increasing demand for HVDC Cable, 180kV HVDC Cable has developed by our Technology and Facility to save high generation cost & ensure the system stability and the supply of electric power. The purpose of this study is to ensure Cable design & Test Procedure of HVDC CABLE.

• Proceedings of the KIEE Conference
• /
• 2002.11a
• /
• pp.127-129
• /
• 2002

A new type of fiber-reinforced polymeric materials for the main body and the arc chamber of the low-voltage circuit breakers was developed. The tensile and the flectional strength of the three kinds of thermoplastic resins for the cover of MCCBs(Molded case circuit breakers) increase much higher than those made of BMC that has been used. In a high current-breaking test, an experimental MCCB with the new insulating material showed no-cracks on the bodies.

• Proceedings of the Korean Magnestics Society Conference
• /
• 2001.04a
• /
• pp.68-69
• /
• 2001

• The Plant Pathology Journal
• /
• v.34 no.1
• /
• pp.65-70
• /
• 2018

Co-infection with two virus species was previously reported in some cactus plants. Here, we showed that Notocactus leninghausii f. cristatus can be co-infected with six different viruses: cactus mild mottle virus (CMMoV)-Nl, cactus virus X (CVX)-Nl, pitaya virus X (PiVX)-Nl, rattail cactus necrosis-associated virus (RCNaV)-Nl, schlumbergera virus X (SchVX)-Nl, and zygocactus virus X (ZyVX)-Nl. The coat protein sequences of these viruses were compared with those of previously reported viruses. CMMoV-Nl, CVX-Nl, PiVX-Nl, RCNaV-Nl, SchVX-Nl, and ZyVX-Nl showed the greatest nucleotide sequence homology to CMMoV-Kr (99.8% identity, GenBank accession NC_011803), CVX-Jeju (77.5% identity, GenBank accession LC12841), PiVX-P37 (98.4% identity, GenBank accession NC_024458), RCNaV (99.4% identity, GenBank accession NC_016442), SchVX-K11 (95.7% identity, GenBank accession NC_011659), and ZyVX-B1 (97.9% identity, GenBank accession NC_006059), respectively. This study is the first report of co-infection with six virus species in N. leninghausii f. cristatus in South Korea.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.32 no.3
• /
• pp.229-233
• /
• 2019

Pure $BiFeO_3$ (BFO) and (Eu, V) co-doped $Bi_{0.9}Eu_{0.1}Fe_{0.975}V_{0.025}O_{3+{\delta}}$ (BEFVO) thin films were deposited on $Pt(111)/Ti/SiO_2/Si(100)$ substrates by chemical solution deposition. The effects of co-doping were observed by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy (SEM). The electrical properties of the BEFVO thin film were improved as compared to those of the pure BFO thin film. The remnant polarization ($2P_r$) of the BEFVO thin film was approximately $26{\mu}C/cm^2$ at a maximum electric field of 1,190 kV/cm with a frequency of 1 kHz. The leakage current density of the co-doped BEFVO thin film ($4.81{\times}10^{-5}A/cm^2$ at 100 kV/cm) was two orders of magnitude lower than of that of the pure BFO thin film.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.1032-1033
• /
• 2015

차세대 친환경 송전기술로 세계적으로 주목되고 있는 HVDC는 유전체 손실이 없으며 안정도가 좋아 송전용량이 크고 송전효율이 높으며 선로의 절연계급이 낮으므로 경제적이고, 주파수가 다른 계통과 비동기 연계가 가능하여 고효율 녹색기술로 크게 각광받고 있다. 본 논문에서는 HVDC 송전선로의 핵심 절연물인 가공절연디바이스에 대한 직류 절연 설계 및 평가기술을 연구개발하고, 이를 바탕으로 핵심 절연물인 HVDC 500kV 급 폴리머애자를 개발한 시제품에 대한 공인시험기관의 개발시험을 통하여 성능평가를 완료한 다음, HVDC 500kV가 실제로 가압되는 실증선로에서 1년간의 실증시험을 수행하고, 실증을 완료한 시료에 대하여 성능확인을 통한 신뢰성 확보를 목표로 개발을 진행하여 성공적인 결과를 거둔 내용에 대하여 설명하고자 한다.

• CELLMED
• /
• v.10 no.3
• /
• pp.21.1-21.8
• /
• 2020

Over a span of few decades, the world has seen the emergence of new viruses that have posed serious problems to global health .COVID-19 is a major pathogenic threat to the modern world that primarily shoots the respiratory system of human beings. Wuhan which is the capital city of Hubei, China was the first place in the world where first cases of COVID-19 emerged and the scores of cases significantly increased at an immense rate leading to city isolation and establishment of new specially designed hospitals. SARS-CoV had emerged from bats in china (2002) and MERS-CoV from camels transmitted via bats in Middle East (2012) where the previous versions of COVID-19 took place. Infections with SARS-CoV-2 are now widespread, like Nuclear Chain Reaction (NRC). In this review we will discuss the COVID-19 origin, transmission, incubation, diagnosis and therapies available at the present scenario.

• Proceedings of the KIEE Conference
• /
• 1999.07e
• /
• pp.2123-2125
• /
• 1999

In recent the XLPE cable has been applied more widely because of its advantages, such as the low-cost and simple installation. For a prefabricated joint, its working time is short, its jointing procedures aγe simple, and its quality control is easy. Electrical performance targets of our developed 66kV cable accessories has been approved through the type test in accordance with IEC publication 840. This paper describes the developmental effort in terms of the design, structure and results of performance verification tests for 66kV XLPE cable system.