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수평반고리관성 양성체위성현훈: 97예의 임상 양상 분석
문소영,최광동,박성호,김지수 대한신경과학회 2004 대한신경과학회지 Vol.22 No.3
Background: Horizontal canal benign positional vertigo (BPV) is characterized by direction-changing nystagmus beating to the lowermost ear (geotropic) or to the uppermost ear (apogeotropic) induced by head turning while the patient is lying down. The clinical features of horizontal canal BPV has rarely been studied in a large group of patients in Korea. Methods: Ninety-seven patients with horizontal canal BPV were recruited from September 2000 to August 2003. The diagnosis of BPV was based on the typical nystagmus concurrent with vertigo elicited by positioning maneuvers. The type was divided into geotropic or apogeotropic. The demographic features, spontaneous nystagmus, positional nystagmus, results of head thrusting and head shaking, and nystagmus induced by lying down were analyzed. Results: The patients included 68 (70.1%) women and 29 (29.9%) men. Mean age of the patients was 61.1±13.8 with no difference between women and men. They were divided into 54 (55.7%) geotropic and 43 (44.3%) apogeotropic types. The horizontal nystagmus was also provoked by Hallpike maneuver in 15 cases. Horizontal nystagmus was also induced by lying down from sitting to supine position in 7 patients; 3 apogeotropic and 4 geotropic. The nystagmus was ipsilesional in 2 of apogeotropic cases and contralesional in 2 of geotropic cases. Conclusions: In horizontal canal BPV, horizontal nystagmus may be induced by Hallpike maneuver or lying down as well as head turning in supine position. The direction of nystagmus induced by lying down may help deciding the side of the canal involved.
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문소영 정보통신정책연구원 2007 정보통신정책 Vol.19 No.11
지난 4월 27일 미국 FCC는 디지털방송 전환에 따른 698MHz~806MHz(이하 700MHz) 대역의 경매안에 대해 정책을 발표했다. 미국에서는 2009년 2월 17일 아날로그 방송이 종료됨에 따라 현재 아날로그 TV 방송용으로 사용하고 있는 700MHz 대역의 디지털방송의 전환에 따른 여유 주파수 대역의 경매가 최근 이슈이다. 또한 700MHz 주파수 대역은 무선시장에 진출할 수 있는 좋은 기회라 여겨 치열한 경쟁이 예상됨에 따라 이번 주파수 경매는 수백억달러의 수익이 예상되는 상황이다. 이에 본고에서는 미국의 DTV 전환에 따른 700MHz 대역의 주파수 경매제 계획에 대한 기존의 내용과 함께 새롭게 고시된 정책들 중심으로 간략히 소개하고자 한다.
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폐영가철 투수성반응벽체를 이용한 Modified Fenton 산화에 의한 MTBE 처리연구
문소영,오민아,이재영,Moon, So-Young,Oh, Min-Ah,Lee, Jai-Young 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.2
MTBE (Methyl tertiary-butyl ether) has been commonly used as an octane enhancer to replace tetraethyl lead in gasoline, because MTBE increases the efficiency of combustion and decreases the emission of carbon monoxide. However, MTBE has been found in groundwater from the fuel spills and leaks in the UST (Underground Storage Tank). Fenton's oxidation, an advanced oxidation catalyzed with ferrous iron, is successful in removing MTBE in groundwater. However, Fenton's oxidation requires the continuous addition of dissolved $Fe^{2+}$. Zero-valent iron is available as a source of catalytic ferrous iron of MFO (Modified Fenton's Oxidation) and has been studied for use in PRBs (Permeable Reactive Barriers) as a reactive material. Therefore, this study investigated the condition of optimization in MFO-PRBs using waste zero-valent iron (ZVI) with the waste steel scrap to treat MTBE contaminated groundwater. Batch tests were examined to find optimal molar ratio of MTBE : $H_2O_2$ on extent to degradation of MTBE in groundwater at pH 7 with 10% waste ZVI. As the results, the ratio of optimization of MTBE to hydrogen peroxide for MFO was determined to be 1:300[mM]. The column experiment was conducted to know applicability of MFO-PRBs for MTBE remediation in groundwater. As the results of column test, MTBE was removed 87% of the initial concentration during 120days of operational period. Interestingly, MTBE was degraded not only within waste ZVI column but also within sand column. It means the aquifer may affect continuously the MTBE contaminated groundwater after throughout the waste ZVI barrier. The residual products showed acetone, TBF (Tert-butyl formate) and TBA (Tert-butyl acetate) during this test. The results of the present study showed that the recycled materials can be effectively used for not only a source of catalytic ferrous iron but also a reactive material of the MFO-PRBs to remove MTBE in groundwater.
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키워드 네트워크 분석을 통한 『한국초등수학교육학회지』 연구의 동향 분석
문소영,조진석,Moon, So Young,Cho, Jinseok 한국초등수학교육학회 2019 한국초등수학교육학회지 Vol.23 No.4
본 연구에서는 키워드 네트워크를 통해 국내 초등수학교육 분야의 대표적인 학술지인 『한국초등수학교육학회지』에 수록된 논문의 키워드를 대상으로 본 학술지의 연구 동향을 살펴보았다. 자료수집은 창간호부터 2018년까지 총 378편의 논문을 대상으로 하였으며, 논문에 포함된 총 1140개의 키워드들에 대하여 Krkwic 프로그램과 NodeXL 프로그램을 활용하여 빈도 분석 및 키워드 네트워크 분석을 실시하였다. 연구 결과 첫째, 빈도분석 결과 최소 5회 이상 출현하여 나타난 키워드는 48개로 수학과교육과정, 수학교과서, 학교수학, 수학문제해결, 수학영재 등이 있었다. 둘째, 키워드 네트워크 분석 결과에서 중요성이 높게 나타난 키워드는 수학교과서, 학교수학, 수학과교육과정, 수학문제해결, 수학적의사소통 등이 나타났다. 이러한 연구 결과를 바탕으로 본 학술지의 연구의 주요한 연구 주제어를 파악하고 연구 동향을 논의하였으며 연구의 제한점을 바탕으로 제언을 할 수 있었다. The purpose of this study is to explore the research trends and knowledge structures of 『Journal of Elementary Mathematics Education in Korea』 by applying the keyword network analysis. To do this, we analyzed the frequency of the occurrence of keywords in the journal and conducted keyword network analysis using the Krkwic program and NodeXL program. The results of the analysis are as follows. Firstly, 749 keywords were extracted from keyword cleansing process and 48 keywords, including mathematics curriculum, mathematics textbooks, school mathematics, mathematical problem solving, mathematically gifted student, etc. appeared more than five times. Secondly, the keyword network analysis showed that the keywords-mathematics textbooks, school mathematics, mathematical problem solving, mathematical communications-have high connection centrality. Finally, we provided the limitations of this study and suggested future research.
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