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Chu, Sung-Yul,Hwang, Young-Jin,Kim, Young-Jae,Ko, Tae-Kuk The Korean Society of Superconductivity and Cryoge 2009 한국초전도저온공학회논문지 Vol.11 No.4
In order to apply superconducting electric machineries such as a Superconducting Fault Current Limiter (SFCL) to the power grid, the single module should be connected in series to have reasonable size. Superconducting tapes in the module also should be stacked to satisfy requirements such as large operation current of the power grid. This is because a single superconducting tape has restricted applicable current capacity. Moreover especially in SFCL at the fault, there should be equal voltage distribution in series-connected SFCL modules. In this paper, we investigated the voltage distribution in fault current of series-connected YBCO coated conductors (CC). Depending on characteristics of the CC samples such as critical current, even voltage distribution could be achieved or not. In addition, the effect of stacked CC on the change of voltage distribution comparing to non-stack cases in series connection was confirmed by experiments. As the CC stacked, voltage difference could be reduced.
Sung Yul Chu,Jae Young Jang,Sukjin Choi,Young Jae Kim,Ki Sung Chang,Tae Kuk Ko IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>To design a large scale superconducting fault current limiter (SFCL) for power grids, a single long-length YBCO coated conductor (CC) wire is preferred. However this single YBCO CC wire can cause a problem of unequal voltage distribution between the parts on the long wire at quench by the faults. Inhomogeneous critical current of the YBCO CCs in the SFCL is a possibility. Furthermore, sub-cooled liquid nitrogen (LN<SUB>2</SUB>) condition is usually used to increase current capacity of the SFCL. However, this sub-cooled condition can worsen the inhomogeneity between the YBCO CCs. Therefore, it is important to understand the relation between the unequal voltage distribution and the inhomogeneous critical currents in the single long length YBCO CC. In this paper, experiments with the same single YBCO CC wire were conducted in various temperature conditions, LN<SUB>2</SUB> and sub-cooled LN<SUB>2</SUB> . In both experiments, the critical currents and voltage distributions generated by faults at short-circuit tests were measured. It was observed that the inhomogeneous condition impacts on the unequal voltage distribution.</P>
1985년 한국에서 발생한 Scrub Typhus 환자의 혈청진단 및 임상역학적 조사
주용규,富山 哲雄,전성주,김민자,박승철,최경열,김연수,이호왕 대한감염학회 1988 감염 Vol.20 No.2
Serological studies were performed on the 2,135 sera from the suspected Hemorrhagic fever with renal syndrome patients in 1985 and 64 scrub typhus patients were diagnosed serologically. Serotypes of etiologic agents, epidemiology and clinical features of the patients with scrub typhus were analyzed. The results were summarized as follows. 1) Among the 64 patients were infected with Rickettsia tsutsugamushi Karp type, 22 patients were infected with Gilliam type and only two patients were infected with Kato type. The remaining 16 patients had antibodies against more than two serotypes of R. tsutsugamush at the same time. 2) The regional occurrence of the patients showed that 33 patients occurred in Kyunggi province and the remaining patients were occurred in all over the Korea. 3) Fifty three of the 64 patients were female and 11 were male. More than a half of the patiens were in age groups of 50-70. 4) As the clinical features, most of the patients showed fever, chill, general weakness and myalgia however, abdominal pain, sputum and dyspnea were not uncommon. Clinical signs such as tachycardia, tachypnea, pharyngeal and conjunctival injection and abdominal tenderness were common but hepatomegaly, hypotension, rales, and edema were uncommon. 5) The laboratory findings showed frequently elevation of transaminase and abnormal chest X-ray, and leukocytosis, thrombocytopenia and abnormal urinary sedimetns were not uncommon. 6) Most of the patients showed one to three weeks of fever and then gradual improvement, but two were died of pulmonary edema. 7) Because most of the patients occurred in autumn, during the epidemic season of HFRS and leptospirosis, the differential serologic diagnosis among the diseases is absolutely demanded.
Surface plasmon-enhanced light-emitting diodes using silver nanoparticles embedded in p-GaN
Cho, Chu-Young,Kwon, Min-Ki,Lee, Sang-Jun,Han, Sang-Heon,Kang, Jang-Won,Kang, Se-Eun,Lee, Dong-Yul,Park, Seong-Ju IOP Pub 2010 Nanotechnology Vol.21 No.20
<P>We demonstrate the surface plasmon-enhanced blue light-emitting diodes (LEDs) using Ag nanoparticles embedded in p-GaN. A large increase in optical output power of 38% is achieved at an injection current of 20 mA due to an improved internal quantum efficiency of the LEDs. The enhancement of optical output power is dependent on the density of the Ag nanoparticles. This improvement can be attributed to an increase in the spontaneous emission rate through resonance coupling between the excitons in multiple quantum wells and localized surface plasmons in Ag nanoparticles embedded in p-GaN. </P>
유해가스 및 분진이 발생하는 작업장내의 자연환기에 대한 연구
김철,추병길,최종욱,유수열 한국산업안전학회 2000 한국안전학회지 Vol.15 No.1
In recent, occupational diseases in harmful working places become a social issue. It is the well-known fact that a respiration in polluted working places exert a serious effect on health of workers. Accordingly, the cutting off contaminants air originally is the best way to improve working environments. In these cases, ventilation systems should be essentially installed to dilute or exhaust the contaminated indoor air. In this study, we investigated the characteristics of ventilation system of the noxious gas in working indoor places with natural ventilation by using COMET. The numerical simulations were carried out the natural ventilation with two phase(air, dust). For turbulent flow, Reynolds stresses were closed by the standard k-εmodel. The results are as follows ; 1) In the natural exhaust in the working place, the flows of the central region have a more rapid velocity vector than the right and left one. 2) Numerical results show that the distribution of contaminants concentration have greater influence on convection than the case of diffusion by government of velocity vectors. 3) To observe the velocity variation with distance, three location of distance are considered. As results, it shows that the velocity are 0.075(m/s) at y=5(m), 10(m) and mean concentration are raised 10.6% at y=5(m), 10(m). 4) We have presented the useful data for the adequate counterplan in the harmful working places by carrying out the various investigation of the natural ventilation.