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RISS 인기검색어
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- 저자 : Kwang-Yoo Byun (검색결과 30 건)
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Fabrication of $SrZrO-3$-based Proton Conductors and Their Characterization
Yoo, Kwang-Soo,Byun, Douck-Young The Korean Ceramic Society 2001 The Korean journal of ceramics Vol.7 No.2
The Y- or Yb-doped SrZrO$_3$ proton conductors were fabricated using the powders prepared by the self-propagating high-temperature synthesis (SHS). The electrical conductivity was evaluated from an a.c. impedance measurements. The conductivity of SrZr$_{0.92}$Yb$_{0.08}$O$_{3-\delta}$ was 1.8$\times$10$^{-3}$ Scm$^{-1}$ at $900^{\circ}C$ in dry air atmosphere and its activation energy was 0.50 eV. The conductivity in wet air was larger, compared with the dry air, and the activaton energy of SrZr$_{0.92}$Yb$_{0.08}$O$_{3-\delta}$ in wet air was 0.40 eV.
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A Novel Implantable Cerebrospinal Fluid Reservoir : A Pilot Study
Byun, Yoon Hwan,Gwak, Ho Shin,Kwon, Ji-Woong,Kim, Kwang Gi,Shin, Sang Hoon,Lee, Seung Hoon,Yoo, Heon The Korean Neurosurgical Society 2018 Journal of Korean neurosurgical society Vol.61 No.5
Objective : The purpose of this pilot study was to examine the safety and function of the newly developed cerebrospinal fluid (CSF) reservoir called the V-Port. Methods : The newly developed V-Port consists of a non-collapsible reservoir outlined with a titanium cage and a connector for the ventricular catheter to be assembled. It is designed to be better palpated and more durable to multiple punctures than the Ommaya reservoir. A total of nine patients diagnosed with leptomeningeal carcinomatosis were selected for V-Port insertion. Each patient was followed up for evaluation for a month after the operation. Results : The average operation time for V-Port insertion was 42 minutes and the average incision size was 6.6 cm. The surgical technique of V-Port insertion was found to be intuitive by all neurosurgeons who participated in the pilot study. There was no obstruction or leakage of the V-Port during intrathecal chemotherapy or CSF drainage. Also, there were no complications including post-operative intracerebral hemorrhage, infection and skin problems related to the V-Port. Conclusion : V-Port is a safe and an easy to use implantable CSF reservoir that addresses problems of other implantable CSF reservoirs. Further multicenter clinical trial is needed to prove the safety and the function of the V-Port.
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명태(Gadus chalcogrammus)의 성장 단계별 질병 모니터링
김광일 ( Kwang Il Kim ),변순규 ( Soon-gyu Byun ),강희웅 ( Hee Woong Kang ),남명모 ( Myung-mo Nam ),최진 ( Jin Choi ),유해균 ( Hae-kyun Yoo ),이주 ( Chu Lee ) 한국어류학회 2017 韓國魚類學會誌 Vol.29 No.1
본 연구에서는 명태 양식 기술 개발 과정 중 수산생물 병원체의 영향을 알아보고자 사육수 내 총 세균수 변화, 분포와 명태에 대한 영향을 분석하였으며, 성장 단계별 명태의 병원체 (세균, 기생충 및 바이러스) 조사 및 비정상 개체 발생에 대한 원인 구명을 수행하였다. 자어 단계에서 사육수의 평균 세균수는 2.11×10<sup>3</sup> cfu/mL로 나타났으며, 비브리오균이 52%로 가장 높게 분포하였다. 치어 및 미성어 단계에서 사육수의 세균수는 3.43×10<sup>3</sup> cfu/mL (슈도모나스균 90% 분포) 그리고 성어 단계에서는 3.2 ×10<sup>2</sup> cfu/mL (슈도모나스 52%)로 나타났다. 명태 사육수 세균총의 변화는 먹이생물의 종류, 공급 및 잔류량에 의해 영향을 받는 것으로 판단된다. 외관상 건강한 개체에서는 대량 폐사를 일으킬 수 있는 세균, 바이러스가 검출되지 않았으나, 일부 안구돌출, 턱 주변 조직 출혈을 보이는 비정상 개체에서 아가미 새변의 기포 형성, 각막 조직 및 맥락막 주변 조직 괴사가 관찰되었다. 특히, 병변 부위에서 검출된 세균 (P. fluorescens, Vibrio sp., V. pelagius, Planococcus maritumus 그리고 Pseudoalteromonas sp.)이 사육수에도 동일하게 분포하였으며, 사육 과정 중 외상 발생 이후 2차 세균 감염이 발생할 수 있음을 시사한다. 명태의 안정적인 양식 산업화를 위한 요소로 기초 질병 데이터 구축과 더불어 지속적인 질병관리가 필요하다. The Alaska pollock (Gadus chalcogrammus) belongs to the family Gadidae; it is a cold water fish, and has been developed as a novel aquaculture species in Korea. In this study, we describe ongoing surveillance for aquatic animal pathogens based on growth stages. We investigated bacterial flora in rearing water, and monitored pathogens; we also analyzed histopathological traits of abnormal fish. In rearing water, the total bacterial counts were 2.1×10<sup>3</sup> cfu/mL and Vibrio spp. (52%) were predominant in the larvae stage. In the juvenile and adult stages, the total bacterial counts were 3.4×10<sup>3</sup> and 3.2×10<sup>2</sup> cfu/mL, respectively (with Pseudomonas sp. as the predominant species; 90% and 52%). This result revealed that the bacterial flora in rearing water changed depending on the feeding types. No virulent-bacteria or problematic viruses (VHSV, viral hemorrhagic septicemia virus; NNV, nervous necrosis virus; MBV, marine birnavirus) were detected from outwardly healthy fish using either culture or PCR assay. Some juveniles (less than 5%) had gas bubbles on the gill lamellae, degeneration of the corneal epithelium, and choroid gland degeneration, suggesting that these symptoms were caused by external injury and secondary infection by opportunistic bacteria. Disease management is important to cope with disease emergence in the novel aquaculture species Alaska pollock.
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변호광 ( Ho Kwang Byun ),유서춘 ( Seo Choon Yoo ) 건국대학교 교육연구소 2004 교사와 교육(구 교육논집) Vol.28 No.-
The purpose of this researeh was to investigate the common delinquencies commiled by Taekwondo players and non-players of high school and to provide basis data in support. The subjects were 800 students : Including 184 taekwondo players at athletic high school(129 boys,55 girls), 211 non-players at high schools(152 boys, 59 girls) in Seoul. 195 taekwondo players at athletic high schools(154 boys, 41 girls), 210 non-players at high schools(l50 boys, 60 girls)in Incheon. They were compared and analysed. in aspects of sex, father`` s jobs and education, amount of pocket money, careers as a player, and winning prizes. They were also compared and analysed in the aspect of violations of public rules, properties, status, personal relationship, and seclusion according to the type of delinquency. Data was collected through questionnaires and self-administration method and analysed according to one-way ANOVA The conclusions were as follows: 1. The level of delinquency depended on mediate variables. 1) Male students showed a higher frequency of delinquency in public rules, status, seclusion, properties, and personal relationship. 2) The higher the father``s job the greater the frequency of delinquency Professional work, administrative work, sales, sales, etc, blue color, clerical work in sequence. 3) Father``s education had no effect on delinquency. 4) Statistics showed. that the more pocket money, the higher the frequency of delinquency.(according to the following order: over 160.000 won, less 160.000 won ~ over 120.000 won, less 120.000 won ~ over 80.000 won, over 40.000 won -less 80.000 won, less 40.000 won). 2. The level of delinquency depending on taekwondo players and non-players showed made no difference. 1) Public rules between taekwondo players and non-players showed taekwondo players had a higher frequency of delinquency than non-players. 2) Property hetween taekwondo players and non-players showed made no difference. 3) Status between taekwondo players and non-pLayers showed made no difference. 4) The personal relationship between taekwondo players and non-players showed made no difference. 5) Seclusion between taekwondo pLayers and non-players showed non-players had a higher frequency of delinquency than taekwondo players. 3. Careers as a taekwondo player made no difference. 4. Careers of winning prizes as a taekwondo player had no effect on public rules, property, personal relationship, and seclusion except for status.
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격자형 기후변화 시나리오 자료를 활용한 한반도의 증발산량 전자 기후도 생산 및 분석
유병현,이규종,이변우,김광수,Yoo, Byoung Hyun,Lee, Kyu Jong,Lee, Byun Woo,Kim, Kwang Soo 한국농림기상학회 2017 한국농림기상학회지 Vol.19 No.2
농경지에서의 증발산량 예측은 농업 분야에서의 기후변화 영향 평가 및 적응 계획 수립에 도움을 줄 수 있다. 본 연구에서는 격자형 국가 표준 기후변화 시나리오 자료를 이용해 잠재 증발산량 (PET)과 가뭄지수 (DI) 전자 기후도의 생산 및 분석을 수행하였다. 특히, 격자형 기상 자료의 처리를 지원하는 도구인 readGrADSWrapper를 기반으로 격자형 기후변화 시나리오 자료를 통계 분석 도구인 R에서 활용하는 기술에 중점을 두었다. FAO-56 공식을 R 스크립트에 구현하여 현재와 미래 조건에서 벼 재배기간 동안의 PET를 계산하였다. 또한, 이를 활용하여 벼 재배에 따른 증발산량 ($PET_{rice}$)과 DI 자료를 생산하고 시공간적 분석을 수행하기 위한 R 스크립트를 구현하였다. 한반도에서 PET의 시공간적 변화 양상은 현재와 미래 조건에서 지역에 따라 차이를 보였다. 전반적으로 한반도에서는 PET와 $PET_{rice}$가 21세기 후반으로 갈수록 증가하는 것으로 나타났다. 이러한 예측 결과들은 지역과 시기에 따라 증발산량 증가에 대응하기 위한 수자원 관리가 필요하다는 것을 암시하였다. 예를 들어, 현재 조건에서 습윤 지역으로 분류되던 충청남도 지역이 21세기 중반 이후에는 아습윤 지역으로 바뀔 것으로 전망되었다. 이러한 결과들은 PET와 DI 등 수자원과 관련된 변수 값들의 시공간적인 계산과 분석을 통해 미래 기후조건에서 작물 생산성을 증진시키기 위한 적응 대책 수립을 지원할 수 있을 것이다. 또한, readGrADSWrapper와 같은 격자형 기상 자료의 처리도구의 활용을 통해 보다 다양한 응용기후 변수에 대한 전자기후도 생산 및 분석을 원활히 수행할 수 있을 것이다. Spatio-temporal projection of evapotranspiration over croplands would be useful for assessment of climate change impact and development of adaptation strategies in agriculture. Potential evapotranspiration (PET) and dryness index (DI) during rice growing seasons were calculated using climate change scenario data provided by the National Institute of Meteorological Research (NIMR). A data processing tool for gridded climate data files, readGrADSWrapper, was used to calculate PET and DI during the current (1986-2005) and future (2006-2100) periods. Scripts were written to implement the formulas of PET and DI in R, which is an open source statistical data analysis tool. Evapotranspiration in rice fields ($PET_{Rice}$) was also determined using R scripts. The Spatio-temporal patterns of PET differed by regions in Korean Peninsula under current and future climate conditions. Overall, PET and $PET_{Rice}$ tended to increase throughout the $21^{st}$ century. Those results suggested that region-specific water resource managements would be needed to minimize the risk of water loss in the regions where considerable increases in PET would occur under the future climate conditions. For example, a number of provinces classified as a humid region were projected to become a sub-humid region in the future. The Spatio-temporal assessment of water resources based on PET and DI would help the development of climate change adaptation strategies for rice production in the 21st century. In addition, the studies on climate change impact would be facilitated using specialized data tools, e.g., readGrADSWrapper, for geospatial analysis of climate data.
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