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김현구,최재우,손정봉,정우식,이화운 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.6
An analysis of wind environments using computational fluid dynamics and an evaluation of wind resources using measurement data obtained from meteorological observation sites at Homi-Cape, Pohang have been carrid out for siting a wind farm. It was shown that a numerical simulation using computational fluid dynamics would provide reliable wind resource map in complex terrain with land-sea breeze condition. As a result of this investigation, Homi-Cape wind farm with 11.25 MW capacity has been designed for maximum power generation and 25.7GWh electricity production is predicted.
주미,현복진,김운학,김옥녀 한국병원약사회 1998 병원약사회지 Vol.15 No.4
Dissolution and content-uniformity tests are very important and essential procedures for the controlling of medication bioavailability. Depends on the bioavailability of medication, the efficacy and safety in patient therapy are different. Currently five different manufactured acyclovir tablets (A, B, C, D and E) are available in Korea. This study performed to evaluate the bioavailability of those acyclovir tablets, and to help the clinicians for valid selection of medication in patient therapy. The study methods were consisted of the dissolution tests and content-uniformity tests of each acyclovir tablet. The dissolution tests were performed six tablets of each acyclovir in the two artificial juices for 30 minutes : (1) a gastric juice with pH 1.2, (2) a enteric juice with pH 6.8. The content-uniformity tests were performed the measurements of ten solutions (200 mcg/㎖) made by each acyclovir tablet, and compared them with the standard solution. All tests were measured by the HPLC method. The results of the dissolution tests showed that both cases ((1) & (2)) were presented on tablet A, B, E, D and C in high dissolution rate order, and also all acyclovir tablets meet for the standard of KP Ⅶ (90% above) in the content-uniformity tests. In conclusion, the good quality of medication is very important to increase the efficacy and safety of patient therapy, and is determined by the bioavailability measurements of each medication. The conducting of bioavailability tests for each medication must be performed on the regular basis.
Fabrication and Tests of the 24 kV class Hybrid Superconducting Fault Current Limiter
Lee, B.W.,Sim, J.,Park, K.B.,Oh, I.S.,Yim, S.W.,Kim, H.R.,Hyun, O.B. The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.4
We fabricated and tested a novel hybrid superconducting fault current limiter (SFCL) of three-phase $24kV_{rms}/630A_{rms}$ rating. In order to apply conventional resistive SFCLs into electric power systems, the urgent issues to be settled are as follows, such as initial installation price of SFCL, operation and maintenance cost due to ac loss of superconductor and the life of cryostat, and high voltage and high current problems. The ac loss and high cost of superconductor and cryostat system are main bottlenecks for real application. Furthermore in order to increase voltage and current ratings of SFCL, a lot of superconductor components should be connected in series and parallel which resulted in extreme high cost. In addition, the method to quench all components at the same instant needs very sophisticated skill and careful operation. Due to these problems, the practical applications of SFCL were pending. Therefore, in order to make practical SFCL, the price of SFCL should be lowered and should meet the demand of utilities. We designed novel hybrid SFCL which combines superconductor and conventional electric equipment including vacuum interrupter, power fuse and current limiting reactor. The main purpose of hybrid SFCL is to drastically reduce total usage of superconductor by adopting current commutation method by use of superconductor and high fast switch. Consequently, it was possible to get the satisfactory test results using this method, and further works for field tests are in the process.
Design and Experiments of Novel Hybrid Type Superconducting Fault Current Limiters
Lee, B.W.,Park, K.B.,Sim, J.,Oh, I.S.,Lee, H.G.,Kim, H.R.,Hyun, O.B. IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>In order to apply resistive superconducting fault current limiters into electric power systems, the urgent issues to be settled are as follows, such as initial installation price of SFCL, operation and maintenance cost due to ac loss of superconductor and the life of cryostat, and high voltage and high current problems. The ac loss and high cost of superconductor and cryostat system are main bottlenecks for real application. Furthermore in order to increase voltage and current ratings of SFCL, a lot of superconductor components should be connected in series and parallel which resulted in extreme high cost. In addition, the method to quench all components at the same instant needs very sophisticated skill and careful operation. Due to these problems, the practical applications of SFCL were pending. Therefore, in order to make practical SFCL, the price of SFCL should be lowered and should meet the demand of utilities. LSIS and KEPRI designed novel hybrid SFCL which combines superconductor and conventional electric equipment including vacuum interrupter, power fuse and current limiting reactor. The main purpose of hybrid SFCL is to drastically reduce total usage of superconductor by adopting current commutation method by use of superconductor and ultra fast switch. Consequently, it was possible to get the satisfactory test results using this method, and further works for field tests are in the process.</P>
Voltage Applicable to $Au/YBa_2Cu3O_7$ Meander Lines
김혜림,임성우,유승덕,박충렬,양성은,김우석,현옥배,Kim, H.R.,Yim, S.W.,Yu, S.D.,Park, C.R.,Yang, S.E.,Kim, W.S.,Hyun, O.B. The Korean Superconductivity Society 2010 Progress in superconductivity Vol.12 No.1
We investigated the voltage applicable to $Au/YBa_2Cu3O_7$ (YBCO) meander lines. The meander line was fabricated by patterning Au/YBCO thin films grown on sapphire substrates by photolithography. It was subjected to simulated AC fault currents, and the resistance was measured and analyzed. The samples were immersed in liquid nitrogen during the experiment for effective cooling. The voltage applicable to the meander lines depended on the fault duration. Dependence was strong at short fault durations, and weak at long durations. When the voltage was plotted as a function of the fault duration on a log-log scale, data fell more or less on straight lines for all meander lines. In other words, the voltage applicable to Au/YBCO meander lines on sapphire substrates was inversely proportional to $t^b$, where t is the fault duration and b ranges from 0.4 to 0.5. The results were analyzed quantitatively with the concept of heat balance. Under adiabatic condition, the voltage is to be inversely proportional to $t^{0.5}$ for all samples. Less value of b for some samples is thought to be due to cooling of the samples by liquid nitrogen.
Kumar Pankaj,Sharma Aditya,Bishnoi Priyanka,Vij Ankush,Kumar Sandeep,Shin Hyun-Joon,Chae K. H.,Lee B. H.,Won S. O. 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.6
Pure and doped (Cr and Ge) ZnGa2O4 compounds are prepared using solid-state reaction method. Single-phase nature of pure and doped ZnGa2O4 compounds is investigated using X-ray difraction (XRD). XRD results indicate lower theta angle shifting, decrease in particle size and tensile strain in the doped samples. A granular morphology of amalgamated particles is seen in the SEM images. EDS results convey, practically, the same concentrations (atm%) of doped elements as used during the preparation. X-ray absorption near-edge structure (XANES) results helped to determine the valence state of elements. O K-edge XANES shows a signifcant orbital hybridization of O 2p shells with the d shells of doped atoms (i.e., Cr and Ge). Broad PL bands, of nearly the white-light emission, are observed in all of the samples. Modifcation in the PL intensity and emitted wavelengths, upon doping of Cr3+ and Ge3+ ions, are discussed through the energy transfer mechanisms and defects in the compounds.
ZnO 나노막대가 형성된 STO기판에 증착한 Y-Ba-Cu-O 박막의 미세구조 분석
오세권,장건익,강병원,김경원,이초연,현옥배,Oh, S.K.,Jang, G.E.,Tran, H.D.,Kang, B.W.,Kim, K.W.,Lee, C.Y.,Hyun, O.B. 한국초전도학회 2009 Progress in superconductivity Vol.11 No.1
For many large-scale applications of high-temperature superconducting materials, large critical current density ($J_c$) in high applied magnetic fields are required. A number of methods have been reported to introduce artificial pinning centers in $YBa_2Cu_3O_{7-{\delta}}$ films for enhancement of their $J_c$. We studied the microstructures and characteristic of $YBa_2Cu_3O_{7-{\delta}}$ films fabricated on $SrTiO_3$ (100) substrates with ZnO nanorods as pinning centers. Au catalyst nanoparticles were synthesized on STO substrates with self assembled monolayer to control the number of ZnO nanorods. The density of Au nanoparticles is approximately $240{\sim}260{\mu}m^{-2}$ with diameters of $41{\sim}49nm$. ZnO nanorods were grown on STO by hot-walled PLD with Au nanoparticles. Typical size of ZnO nanorod was around 179 nm in diameter and $2{\sim}6{\mu}m$ in length respectively. YBCO films deposited directly on STO substrates show the c-axis orientation, while YBCO films with ZnO nanorods exhibit any mixed phases without any typical crystal orientation.