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낙동강변 지하수 및 지표수의 주요원소 용존 농도 결정에 대한 막필터 공극 크기의 영향 분석
김보아,고동찬,하규철,Kim, Bo-A,Koh, Dong-Chan,Ha, Kyoochul 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.4
Various types of inorganic and organic colloids are present in natural water including groundwater. Previous studies showed that Fe, Mn and Al are colloid-forming elements and dissolved concentrations can be erroneous for these elements if water samples are not properly filtered. Dissolved concentrations of elements including Ca, Na, Mg, K, Fe, Mn, Si and Al in groundwater from alluvial and bedrock aquifers, and surface water near Nakdong River were determined to evaluate effects of colloids on dissolved concentrations in natural water samples using various pore sizes of filters. Groundwater is mostly anoxic and have elevated concentrations of Fe and Mn, which provides a unique opportunity to observe the effects of colloids on dissolved concentrations of colloid-forming elements. Membrane filters with four kinds of pore sizes of 1000 nm, 450 nm, 100 nm, and 15 nm were used for filtration of water samples. Concentrations of dissolved concentrations in each filtrate did not show significant differences from 1000 nm to 100 nm. However, concentrations of all elements considered were decreased in the filtrates obtained using 15 nm pore size filters by 10 to 15% compared to those using 450 nm except for bedrock groundwater. Al in surface water showed a distinct linear decrease with the decrease of filter pore sizes. These results showed that 100 nm pore size had little effect to remove colloidal particles in alluvial groundwater and surface water in our study. In contrast, significant concentration decreases in 15 nm pore size filtrates indicate that the presence of 15 to 100 nm colloidal particles may affect determination of dissolved concentrations of elements in natural water.
20대 한국 직장인의 음주 심각도에 대한 직무 스트레스와 BDNF 유전자 다형성의 역할
김보아,이상익,김시경,신철진,손정우,홍주봉,남영우,주가원,Kim, Bo-Ah,Lee, Sang-Ick,Kim, Sie-Kyeong,Shin, Chul-Jin,Son, Jung-Woo,Hong, Joo-Bong,Nam, Yeong-Woo,Ju, Ga-Won 대한생물정신의학회 2012 생물정신의학 Vol.19 No.2
Objectives : The aim of this study was to examine the effects of brain-derived neurotrophic factor (BDNF) genetic polymorphism and job stress on the severity of alcohol drinking. It was hypothesized that individuals with the Met/Met BDNF genotype would be more vulnerable than those carrying the Val allele. Methods : Participants were 133 healthy Korean adults (mean age $28.2{\pm}1.1$). Job stress and the severity index of drinking were investigated through self-reported questionnaires. BDNF (rs6265) gene was genotyped. Results : There was no significant association between job stress and the severity of alcohol drinking. Although the severity of alcohol drinking was not associated with BDNF genetic polymorphism, there was a significant difference in men according to genotype and job stress. Men with homozygous BDNF Met allele were more severe in alcohol drinking when job stress was high, less severe in alcohol drinking when job stress was low than those carrying the Val allele (F = 4.47, p = 0.038). Also higher level of job stress was correlated with higher severity of alcohol drinking in men homozygous for BDNF Met allele (rs = 0.620, p = 0.005). Conclusions : These findings suggest the possibility that Met allele could have differential susceptibility, with men homozygous for BDNF Met allele being more susceptible to both more adverse and less adverse environmental influences.
한국 지역사회 노인대상의 운동중재 프로그램 연구 동향과 mHealth 서비스 개발에의 시사점
김보아,김홍수 한국노인복지학회 2018 한국노인복지학회 학술발표논문집 Vol.2018 No.11
노인의 규칙적인 신체활동은 체력을 증진시키고 생리적 저하의 많은 부분을 예방하지만 그 중요성에 비해 수행정도가 권고기준에 미치지 못하고 있다. 이에 본 연구는 노인 신체기능 향상을 위한 프로그램 개발의 가이드라인을 파악하고, 향후 국내 노인 대상 운동중재 프로그램 개발가이드라인 구축을 목표로, 지역사회 거주 노인을 대상으로 신체활동 프로그램 중 운동 중재 관련 문헌들을 고찰하였다. 자료 수집 방법은 주요 보건의료분야데이터 베이스를 이용하여 2007년부터 2017년까지 국내외 학술지에 게재된 양적 연구 문헌을 수집하였다. 연구 결과 제외 기준을 거쳐 수집된 총 분석대상 문헌은 28개였으며, 이 중 중재 장소가 ‘복지관 혹은 경로당’인 문헌이 39.3%로 가장 큰 비중을 차지하였다. 또한 한 회당 운동시간과 주당 운동시간이 각각 41~60분과 100~149분이었던 문헌의 비중이 가장 컸다. 전체적으로 WHO 가이드라인의 운동 중재시간 권고기준을 충족시키는 연구는 11편으로 절반에 미치지 못하였으며, 고강도의 운동중재를 포함한 연구는 3편에 불과하였다. 이는 운동 중재를 통한 효과가 제한적임을 의미하며, 따라서 표준화된 가이드라인에 기반하여 운동 중재 프로그램을 개발하고 적용하는 연구가 요구되며, 특히 모바일 기기 기반 중재가 확산됨에 따라 이를 적용한 운동 중재 프로그램의 적극적인 개발과 연구가 필요하다.
지하수 유동 방향에 대한 관정배열이 분배추적자 시험에 미치는 영향 분석
김보아,김용철,여인욱,고경석,Kim, Bo-A,Kim, Yongcheol,Yeo, In Wook,Ko, Kyung-Seok 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.3
Partitioning interwell tracer test (PITT) is a method to quantify and qualify a site contaminated with NAPLs (Non-Aqueous Phase Liquids). Analytical description of PITT assumes that the injection-pumping well pair is on the line of the ambient groundwater flow direction, but the test-well pair could frequently be off the line in a real field site, which could be an erroneous factor in analyzing PITT data. The purpose of this work is to study the influence of the angle of the test-well pair on the ambient groundwater flow direction based on the result from PITT. From the experiments, it was found that the obliqueness of the test-well pair to the ambient groundwater flow direction could affect the tracer test resulting in a decreased NAPL estimation efficiency. In case of an oblique arrangement of the test-well pair to the ambient flow direction, it was found that the injection of a chase fluid could enhance the estimation efficiency. An increase of the pumping rate could enhance the recovery rate but it cannot be said that a high pumping rate can increase the test efficiency because a high pumping rate cannot give partitioning tracers enough time to partition into NAPLs. The results have a implication that because the arrangement of the test-well pair is a controlling factor in performing and interpreting PITT in the field in addition to the known factors such as heterogeneity and the source zone architecture, flow direction should be seriously considered in arranging test-well pair.
김보아,공소라,송준임,원용진 한국동물분류학회 2008 Animal Systematics, Evolution and Diversity Vol.24 No.3
Soft coral Dendronephthya gigantea (Verrill, 1864) is a conspicuous species dominating shallow sea waters of Jejudo Island, Korea. Recently its whole mitochondrial genome sequencing was completed by us and the sequence information provided an opportunity to test the age of Octocorallia and time of evolutionary separation between some representative orders of the subclass Octocorallia. Molecular phylogenetic analyses based on 13 mitochondrial protein encoding genes revealed a polyphyletic relationship among octocorallians representing two orders (Alcyonacea and Gorgonacea) and four families (Alcyoniidae, Nephtheidae, Briareidae, and Gorgoniidae). Estimates of divergence times among octocorallians indicate that the first splitting might occur around end of or after Cretaceous period (50-79 million years ago (Ma)). The age is relatively young compared to the long history of stony sea corals (¤240 Ma). Taken together our result suggests a possible relatively recent radiating evolution at least in the order Alcyonacea and Gorgonacea. Molecular dating and phylogenetic analysis based on much broader taxon sampling and many genes might give an insight into this interesting hypothesis.