관개방법에 따른 논에서의 수문 및 수질특성에 미치는 영향

전지홍,윤춘경,최진규,윤광식 한국육수학회 2005 생태와 환경 Vol.38 No.1

관개방법이 논에서의 수문 및 수질특성에 미치는 영향을 파악하기 위하여 관개용수가 풍부한 지표수 관개지역과 관개용수가 부족한 지하수관개지역에서의 물수지 및 영양물질수지 분석을 실시하였다. 지표수 관개논은 영농기간동안 지속적으로 관개가 이루어졌으나, 지하수 관개논은 영농초기에만 이루어졌으며 그 이후에는 강우에 의해 담수심이 유지되어 지표유출은 지표수 관개논에 비해상대적으로 낮은 빈도를 나타내었다. 지표수의 영양물질 농도는 시비에 의해 크게 영향을 받는 것으로 나타났으며, 특히 다량의 시비가 이루어지는 영농초기(5~6월 중순)에는 높은 영양물질 농도를 나타내어 이 시기에 논에서 유출이 이루어진다면 하류 수계에 영향을 줄 것으로 판단되었다. 물수지 분석결과 지하수 관개논의 관개량, 지표유출량 등이 상대적으로 지표수 관개논에 비해 낮은 값을 나타내었다. 영양물질수지분석 결과 대부분의 유입은 시비에 의해 이루어졌으며, 유출은 지표유출이 많은 비중을 차지하였으나 지표유출과 침투유출사이의 비율은 토양의 특성에 좌우되는 것으로 판단된다. 외부에서의 유입을 제외하고 시스템내에서의 유출입만 고려한다면, 물관리가 효율적으로 이루어진 지하수 관개논에서 낮은 부하량을 나타내었다. 그러나 기비가 이루어지고 인위적인 낙수나 강우에 의한 유출이 발생할 경우, 높은 부하량 뿐만 아니라 고농도의 영양물질질이 수계로 유입되는 것으로 나타났다. 논에서의 비점오염관리를 위한 대안으로 현재 시행되고 있는 시비량 감소 뿐 아니라, 효율적인 물관리기법 개발이 포함되어야 할 것으로 판단된다. 특히 영농초기의 강우특성과 논에서의 담수기능을 고려해 볼 때 시비에 의한 높은 영양물질 농도를 나타내는 논 표면수의 유출을 효율적으로 억제할 수 있을 것으로 판단된다. 물꼬높이의 증가와 천수간단관개 영농초기의 강우에 의한 유출을 억제시킴으로써 부족한 관개용수의 절약 뿐만아니라 하류수계의 수질보호에 기여를 할 것으로 판단되며, 다양한 조건에 따른 환경적인 측떤 뿐 아니라 벼의 생리적인 측면은 장기적인 모니터링을 통해 반드시 고려되어 야 할 것이다. The comparison of water balance and nutrient loading from paddy field with different irrigation management were carried out during 1999-2002 at two different sites; one is irrigated with groundwater and the other is irrigated with surface water. For the surface water irrigated paddy field, irrigation was performed continuously during growing season. Whereas, initial irrigation with groundwater was applied during initial growing season, and the ponded water depth was maintained by natural precipitation since initial irrigation. The runoff frequency of groundwater irrigated paddy field was less than that of surface water irrigated paddy field. The nutrient concentration of ponded water was high by fertilization at early cultural periods, so reducing surface drainage during fertilization period can reduce nutrient loading from paddy fields. Amount of irrigation water to surface water irrigated paddy field was higher than to groundwater irrigated paddy field and evapotranspiration was similar because it is influenced by climate. Overall input in and output from paddy field irrigated with goundwater were less than that with surface water. This study indicate that efficient water management can reduce surface drainage outflow, save water, and protect water quality. It might be important BMPs for paddy field.

불안정 지지면을 이용한 운동 프로그램이 뇌졸중 환자의 균형에 미치는 효과

이지연,김용수,김진섭,박진현,최윤희,전덕훈,김경 대구대학교 특수교육재활과학연구소 2010 再活科學硏究 Vol.28 No.1

본 연구의 목적은 뇌졸중 환자의 재활을 위하여 불안정 지지면을 이용한 운동 프로그램이 균형 능력과 운동 기능 능력에 미치는 효과를 알아보고자 실시하였다. 불안정 지지면의 이용한 치료는 임상적으로 뇌졸중으로 인한 편마비 환자뿐만 아니라 스포츠 손상 및 노인들의 질환 등 다양한 병인을 가진 환자들의 치료에 이용되고 있다. 대부분의 뇌졸중 환자들은 재활 훈련을 할 수 있는 병원이나 기관에서 치료를 받을 때에 지지면의 차이를 제공함으로써 보다 더 안정한 지지면에서 적응할 수 있는 방법이 요구되고 있다. 하지만, 아직도 불안정 지지면을 이용한 구체화된 치료적 운동 방법과 객관적 평가에 대한 연구가 미비한 실정이다. 이러한 문제점을 해결하기 위하여 최근 뇌졸중 환자의 불안정 지지면과 이론적 근거를 바탕으로 한 운동 프로그램에 대한 연구가 더욱 필요하다. 본 연구에서는 실험군과 대조군이 같은 운동 프로그램을 적용하였을 때, 두 그룹 간에서 나타나는 균형 향상과 운동 기능 향상에 어떠한 효과를 주는지 살펴보고자 하였다. The purpose of this article was to study the effect of the exercise programme that uses the unstable supporting surface to rehabilitate cerebrovascular patients on balance ability and exercise function ability. The therapy is being clinically used for the patients with diverse pathological factors such as hemiplegia caused by CVA, sports injury, and diseases in the elderly. when most patients with CVA are treated in the hospital or institute that can provide rehabilitation training, they need to be given the way to adjust more stable surpporting surface by being provide with various stages of surface. However, the actual therapeutic exercises is still needed and the study for objective assessments wants conducting. To solve these problems, the study of unstable surface exercise programmes based on the evidences recently need to be made for the patients with CVA. in this study, we intend to look into what effects on the balance improvement and the exercise function are different from the experimental group to the control group with the same programme applied to the two groups.

노인 인구에서 신경인지기능저하와 혈청 지질농도와의 상관성

유영선,최석주,정성수,김지은,윤성욱,전동욱,백준형,박성우,이정구,추일한,김영훈 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.6

Objectives : In this study, the authors evaluated the correlation between eurocognitive impairments and serum lipids levels among Korean elderly over the age of 65. Methods : A total of 609 elderly individuals participated in this study. Screening for cognitive impairments were carried out using the Mini-Mental Status Examination-Korean version (MMSE-KC). There were 197 subjects above 1.5SD Of MMSE- KC and they were evaluated using the Korean versions of the Consortium to Establish a Registry for Alzheimer's Disease (AD) (CERAD-KC) and Geriatric Depression Scale (GDS-K). Results : There was a correlation between old age/low levels of education and AD (p<0.05, P<0.01). There was an inverse correlation between the serum level of total cholesterol and the word list recognition test scores. The serum levels of LDL cholesterol were inversely correlated with the scores on the constructional praxis test, word list recall test and word list recognition test. Inverse correlations between the serum level of triglyceride and scores on the word list recall test and word list recognition test were also observed. Conclusion : There were inverse correlations between the serum levels of lipids and language/memory function in subjects with AD.

성인학습원리 기반 웍샵에 의한 사회의학 교육평가의 시도

고광욱,김정민,김윤지,이용환,유병철,전만중 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.2

Background: For effective education of social medicine, new and more efficient means of education are needed because social medicine consist of diverse background academics . Metohods: Workshop based lecture was carried out twice in social medicine class for medical students and was assessed with questionnaires survey. Results: Half of the students were satisfied with workshop-based learning and required more discussion time and pre-information. Conclusions: With some improvements, workshop-based adult learning method is expected to bring effectiveness in social medicine education.

Evaluation of Antioxidant Activity and Cytotoxicity in Mixture Extract of Artemisia asiatica Nakai and Moringa oleifera Lam

Yoon-Ji Lee,Jang-Oh Kim,Chan-Hee Jeon,Ji-Eun Lee,Ji-Hye Shin,Byung-In Min 대한의생명과학회 2020 Biomedical Science Letters Vol.26 No.4

The purpose of this study was performed to evaluate antioxidant activity of the Artemisia asiatica Nakai and Moringa oleifera Lam mixture extract. Mixture extracts were manufactured by concentration and compared with a single extract (only the Artemisia asiatica Nakai mixture and only the Moringa oleifera Lam mixture). The experiments conducted Total polyphenol measurements, Total flavonoid measurements, DPPH radical scavenging activty, ABTS radical scavenging activty and LDH assay. The LDH assay assessment shows that all extracts are cells compared to controls. The toxicity was weak. Finally, The antioxidant capacity was rated higher than mixture extract of a single extract. Also, the optimized mixture was determined AM5 (Artemisia asiatica Nakai mixture: Moringa oleifera Lam mixture = 3:1). For extracts of AM5, Total phenol and flavonoid contents were 271.769±18.087 mg/g and 45.384±5.026 mg/g. and DPPH and ABTS scavenging activity were 70.8±6.496% and 77.1±9.634%. Therefore, it is expected that the value of the extract will increase as it increases its antioxidant activity if it is manufactured according to the appropriate ratio.

Highly Improved Uniformity in the Resistive Switching Parameters of TiO₂ Thin Films by Inserting Ru Nanodots

Yoon, Jung Ho,Han, Jeong Hwan,Jung, Ji Sim,Jeon, Woojin,Kim, Gun Hwan,Song, Seul Ji,Seok, Jun Yeong,Yoon, Kyung Jean,Lee, Min Hwan,Hwang, Cheol Seong WILEY‐VCH Verlag 2013 Advanced Materials Vol.25 No.14

<P><B>Limiting the location where electron injection occurs at the cathode interface</B> to a narrower region is the key factor for achieving a highly improved RS performance, which can be achieved by including Ru Nanodots. The development of a memory cell structure truly at the nanoscale with such a limiting factor for the electric‐field distribution can solve the non‐uniformity issue of future ReRAM.</P>

Propofol protects human keratinocytes from oxidative stress via autophagy expression

Yoon, Ji-Young,Jeon, Hyun-Ook,Kim, Eun-Jung,Kim, Cheul-Hong,Yoon, Ji-Uk,Park, Bong-Soo,Yu, Su-Bin,Kwak, Jin-Won The Korean Dental Society of Anesthsiology 2017 Journal of Dental Anesthesia and Pain Medicine Vol.17 No.1

Background: The skin consists of tightly connected keratinocytes, and prevents extensive water loss while simultaneously protecting against the entry of microbial pathogens. Excessive cellular levels of reactive oxygen species can induce cell apoptosis and also damage skin integrity. Propofol (2,6-diisopropylphenol) has antioxidant properties. In this study, we investigated how propofol influences intracellular autophagy and apoptotic cell death induced by oxidative stress in human keratinocytes. Method: The following groups were used for experimentation: control, cells were incubated under normoxia (5% $CO_2$, 21% $O_2$, and 74% $N_2$) without propofol; hydrogen peroxide ($H_2O_2$), cells were exposed to $H_2O_2$ ($300{\mu}M$) for 2 h; propofol preconditioning (PPC)/$H_2O_2$, cells pretreated with propofol ($100{\mu}M$) for 2 h were exposed to $H_2O_2$; and 3-methyladenine $(3-MA)/PPC/H_2O_2$, cells pretreated with 3-MA (1 mM) for 1 h and propofol were exposed to $H_2O_2$. Cell viability, apoptosis, and migration capability were evaluated. Relation to autophagy was detected by western blot analysis. Results: Cell viability decreased significantly in the $H_2O_2$ group compared to that in the control group and was improved by propofol preconditioning. Propofol preconditioning effectively decreased $H_2O_2$-induced cell apoptosis and increased cell migration. However, pretreatment with 3-MA inhibited the protective effect of propofol on cell apoptosis. Autophagy was activated in the $PPC/H_2O_2$ group compared to that in the $H_2O_2$ group as demonstrated by western blot analysis and autophagosome staining. Conclusion: The results suggest that propofol preconditioning induces an endogenous cellular protective effect in human keratinocytes against oxidative stress through the activation of signaling pathways related to autophagy.

Evaluating the effectivity and emulsion stability of Liriope muscari fruit extract

Ji Yoon Jeon,Bo Ae Kim 한국유화학회 2017 한국유화학회 학술대회 논문집 Vol.2017 No.3

In this study, we have evaluated the safety, antimicrobial activity, and whitening activity of Liriope muscari fruit extract extracted with 80% MetOH. As a result of evaluating toxicity using Zebrafish embryos, it could be seen that toxicity was observed depending on the concentration of the extract. As we have evaluated antibacterial activity using Candida albicans, Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, a clear zone could be seen in S.aureus and E.coli specimens. In the case of Straphylococcus aureus, clear zones of 11.5, and 10.5mm could be observed in 10.0% and 50.0% extract specimens respectively. In the case of Escherichia coli , clear zones of 11.5±0.7, 11.5±0.7, and 15.0±2.8mm could be observed in 1.0%, 10.0%, and 50.0% extract specimens respectively. Evaluation of whitening activity using Zebrafish resulted in inhibition effect at 1.5, 2.5, 3.0% concentrations as tyrosinase activity inhibition was increased. At 1.5%, inhibitory activity was at highest.

Research on feral cat population in Pyeongtaek city

Ji Yeon Kim,Yong Ah Lee,Yurim Ahn,Yoon ji Lee,Chae Eun Jeon,Eun Jung Jo,Hye Won Lee,Moon Suk Yoon,Jin Soo Han 한국실험동물학회 2020 한국실험동물학회 학술발표대회 논문집 Vol.2020 No.7

Highly selective adsorption of <i>p</i>-xylene over other C₈ aromatic hydrocarbons by Co-CUK-1: a combined experimental and theoretical assessment

Yoon, Ji Woong,Lee, Ji Sun,Piburn, Graham W.,Cho, Kyoung Ho,Jeon, Keonghee,Lim, Hyung-Kyu,Kim, Hyungjun,Jun, Chul-Ho,Humphrey, Simon M.,Krishna, Rajamani,Chang, Jong-San The Royal Society of Chemistry 2017 Dalton transactions Vol.46 No.46

<▼1><P>Co-CUK-1 synthesized by a microwave method exhibits highly selective adsorption of <I>p</I>-xylene over other C8 aromatic hydrocarbons.</P></▼1><▼2><P>High quality crystalline Co-CUK-1 can be synthesized rapidly and efficiently by a microwave-assisted method. The resulting microporous coordination material is a highly effective adsorbent for the separation of xylene isomers and ethylbenzene, as demonstrated here through sorption isotherm analysis, Ideal Adsorbed Solution Theory (IAST) calculations, and grand canonical Monte Carlo (GCMC) simulations. Co-CUK-1 showed high sorption capacity and high adsorption selectivity for <I>p</I>-xylene over the corresponding <I>m</I>- and <I>o</I>-isomers, and ethylbenzenes. According to the data obtained from IAST and GCMC simulations, the Co-CUK-1 is found to strongly favour <I>p</I>-xylene adsorption because <I>p</I>-xylene molecules undergo well-defined molecular packing in the 1-D channels; by comparison, the packing efficiencies of <I>o</I>-xylene, <I>m</I>-xylene and ethylbenzene are significantly lower, as is evidenced by lower saturation capacities.</P></▼2>