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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>
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.
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>
Characteristic Comparison of the Superconducting Fault Current Limiter With Various Bypass Reactors
Ki Sung Chang,Dong Keun Park,Seong Eun Yang,Young Jae Kim,Sung Yul Chu,Min Cheol Ahn,Tae Kuk Ko IEEE 2010 IEEE transactions on applied superconductivity Vol.20 No.3
<P>A resistive superconducting fault current limiter (SFCL) has two drawbacks-relatively higher impedance and longer recovery time than the requirement of the electric power system. A parallel-connected bypass reactor (BPR) can be a solution to both problems. As a stage of proof-of-concept, an SFCL comprised of an YBCO S/N switch and a Bi2223-BPR had been presented in the former paper. Although the previous one has shorter recovery time, the generated impedance after a fault was too low to satisfy the requirement of the power system. To apply the SFCL into the power system, the SFCL has proper impedance during the fault. Therefore, we proposed bypass reactors to achieve higher impedance than the previous one in this paper. The SFCLs with a bypass reactor were fabricated and short-circuit test with the SFCLs were conducted. The test results were compared in point of current limiting characteristics and recovery. This research would be applied to a conceptual design of BPR.</P>
Operating Characteristics of Oval-Shaped Resistive Superconducting Fault Current Limiter
Hyun Chul Jo,Ki Sung Chang,Young Jae Kim,Sung Yul Chu,Hyung Jun Kim,Ho Min Kim,Yong Soo Yoon,Tae Kuk Ko IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>In order to limit fault current from an accident in power grid, many research groups have developed resistive superconducting fault current limiters (SFCLs) with a bifilar solenoid and a bifilar pancake types. Comparing with a bifilar solenoid type, a bifilar pancake type has the advantage of its volume, but it has problems such as recovery and insulation of SFCLs. To eliminate the drawback of these two types, in this paper, a new type of coil that is an oval-shaped SFCL, have proposed. This type consists of inner and outer layers which are connected in parallel. A small-scale sample coil was fabricated and experiments for both a short circuit test and recovery characteristic test were performed in liquid nitrogen. Experimental results were compared with two types of coils; the bifilar solenoid and bifilar pancake coil. Consequently, we confirmed the feasibility of an oval-shaped type.</P>
( Byoung Jin Ha ),( Sang Hyup Lee ),( Yong Min Kim ),( Hyun Seok Kwon ),( Young Kwang Chu ),( Kyoung Yul Seo ) 대한안과학회 2006 Korean Journal of Ophthalmology Vol.20 No.4
Purpose: To report a case of inadvertent anterior chamber and cornea stromal injection with high dose antibiotics and steroids during cataract operation. Methods: During cataract operation on a 78 year-old female patient, high dose gentamicin (20 mg/0.5 ml) and dexamethasone (2 mg/0.5 ml) were inadvertently injected into the anterior chamber and cornea stroma when making cornea edema for sealing of the incision sites. Anterior chamber irrigation with balanced salt solution (BSS) was immediately administered. On postoperative day one, extensive cornea edema was noted, and best-corrected visual acuity was 0.2. Descemet`s membrane folds were observed around the corneal incision sites. Topical 5% NaCl and 1% prednisolone were started. Results: Four weeks postoperatively, corneal edema began to reduce significantly. At four months postoperatively, corneal edema fully resolved, and best-corrected visual acuity was 0.8. However, some Descemet`s membrane folds still remained, and a decrease in the number of endothelial cells was noted by specular microscope. Conclusions: In this case involving anterior chamber and cornea stromal injection with high dose antibiotics and steroids, immediate anterior chamber irrigation with balanced salt solution seemed an appropriate management, and the patient`s long-term visual acuity appears good. To prevent such mistakes, precise labeling of all solutions and use of different syringe needles should be considered.
Byoung Jin Ha,Sang Hyup Lee,Yong Min Kim,Hyun Seok Kwon,Young Kwang Chu,Kyoung Yul Seo 대한안과학회 2006 Korean Journal of Ophthalmology Vol.20 No.3
Purpose: To report a case of inadvertent anterior chamber and cornea stromal injection with high dose antibiotics and steroids during cataract operation. Methods: During cataract operation on a 78 year-old female patient, high dose gentamicin (20 mg/0.5 ml) and dexamethasone (2 mg/0.5 ml) were inadvertently injected into the anterior chamber and cornea stroma when making cornea edema for sealing of the incision sites. Anterior chamber irrigation with balanced salt solution (BSS) was immediately administered. On postoperative day one, extensive cornea edema was noted, and best-corrected visual acuity was 0.2. Descemet’s membrane folds were observed around the corneal incision sites. Topical 5% NaCl and 1% prednisolone were started. Results: Four weeks postoperatively, corneal edema began to reduce significantly. At four months postoperatively, corneal edema fully resolved, and best-corrected visual acuity was 0.8. However, some Descemet’s membrane folds still remained, and a decrease in the number of endothelial cells was noted by specular microscope. Conclusions: In this case involving anterior chamber and cornea stromal injection with high dose antibiotics and steroids, immediate anterior chamber irrigation with balanced salt solution seemed an appropriate management, and the patient’s long-term visual acuity appears good. To prevent such mistakes, precise labeling of all solutions and use of different syringe needles should be considered. Korean Journal of Ophthalmology 20(4):241-245, 2006