• Research in Plant Disease
• /
• v.23 no.4
• /
• pp.348-354
• /
• 2017

To investigate occurrence of root-knot nematode (RKN) in plastic house of central area of Korea, 132 soil samples were collected in cucumber, water melon, tomato, red pepper and strawberry fields from 2013 to 2015. Among 132 soil samples, 65 soil samples (49%) were infested with RKN and mean density of RKN was 178 second-stage juveniles per $100cm^3$ soil (min. 1 ~ max. 3,947). The frequency of RKN by regional was the highest in Chuncheon with 80%, followed by Cheonan (68%), Nonsan (36%), Buyeo (33%) and Yesan (30%). The frequency of RKN by crops was the highest in tomato with 83%, followed by cucumber (61%), strawberry (41%), red pepper (30%), watermelon (26%). To identify the species of RKN, fifteen populations were selected for representative populations. As a phylogenetic analysis of 15 populations, southern root-knot nematode (Meloidogyne incognita), peanut root-knot nematode (M. arenaria) and northern root-knot nematode (M. hapla) were identified with 47%, 20% and 33% ratio, respectively. In crops, M. incognita, M. arenaria and M. hapla were detected in tomato, M. incognita and M. arenaria were detected in cucumber and watermelon, and M. hapla was detected in strawberry and lettuce. Thus, there should be a continuous management to major species of each crops to prevent dispersal of RKN damages.

• The Journal of the Petrological Society of Korea
• /
• v.2 no.1
• /
• pp.1-8
• /
• 1993

We report on kyanite newly found in the Yongduri gneiss complex of the Chuncheon-Hongcheon area, central Gyeonggi massif. Major mineral assemblage of quartzofeldspathic gneisses in the study area consists of biotite+ garnet+ sillimanite + plagioclase+ quartz${\pm}$kyanite${\pm}$K-feldspar${\pm}$muscovite. Kyanite occurs in four samples, and coexists with sillimanite in three of these samples. In most cases, kyanite is anhedral to subhedral, ranges up to Imm in the maximum dimension, and occurs as metastable relict grains. These observations indicate that the Yongduri gneiss complex has experienced a medium-pressure type metamorphism, followed by low-pressure type one belonging to the sillimanite+K-feldspar zone. Average temperature and pressure of the peak metamorphism are $683{\pm}62^{\circ}C$ and 4.9-5.5 kbar, respectively, when the existing chemical data are re-interpreted. In conjunction with the finding of kyanite in the Cheongpyeong-Gapyeong area (Lee and Cho, 19921, this study demonstrates that kyanite may occur regionally in central Gyeonggi gneiss complex. Moreover, the persistence of kyanite even after the high-T metamorphism of the sillimanitetK-feldspar zone suggests that the central Gyeonggi massif has experienced a tectonometamorphic evolution characterized by a rapid uplift.

• Korean Journal of Remote Sensing
• /
• v.34 no.6_1
• /
• pp.1119-1130
• /
• 2018

Soyang Lake has been contributing to economic growth by preventing flood damage in the metropolitan area, the water level in the middle to upper flow of lake has been greatly decreased due to the drought in 2015. In order to restore the existing flow rate, Bupyungbo has been built in Bupyeong-ri, Shin Nam-myeon, Inje-gun to cause artificial changes on the sedimentary environment of Bupyeong freshwater region. Therefore, this study intends to confirm the changes of sedimentary environment since Bupyeongbo has been utilized. For this study, we used the Sentinel-2 satellite image data periodically to measure the dimension of water according to the volume of water kept near Bupyung district and analyzed the particle size and the percentage of water content of the sediments through field study. The Sentnel-2 satellite images showed us how the water surface has been changed and that during the period from September 2017 to October 2018, the minimum and maximum area of water surface was observed in June 2018 and in January 2018, respectively. In addition, we find that the smaller being the particle size, the higher having the water content and that there is higher the correlation between the water content and the grain size of the sediment layer. Hereafter, if we will acquire the drone images at Bupyung district, we expect that we will be able to measure the distribution of sediments in the same area according to different time periods and observe various kinds of sediment through field work.

• Journal of The Korean Association For Science Education
• /
• v.31 no.8
• /
• pp.1214-1228
• /
• 2011

As a case study on beginning teachers' teaching professionalism in science-gifted education, we analyzed their teaching professionalism based on pedagogical content knowledge. To do this, we selected 3 elementary and 3 secondary beginning teachers from science-gifted education institutes in the metropolitan area. After their science instructions for science-gifted students were observed, in-depth interviews were conducted. Analyses were conducted with taped videos, researcher's field notes, and transcripts for in-depth interviews. This study revealed that most of the teachers had relatively desirable belief about science-gifted education. However, they tended to have a little deficient practical knowledge about science-gifted students, the curriculum for science-gifted education, science contents, the instructional strategies for science-gifted education, and the assessment in science-gifted education. These results imply that many teachers are likely to have a little deficiency in teaching professionalism for science-gifted students in various aspects, and need to find the ways of improving their teaching professionalism.

• Korean Journal of Biological Psychiatry
• /
• v.12 no.1
• /
• pp.68-72
• /
• 2005

Object:Nicotine dependence is the most common substance abuse disorder. One of the characteristics of nicotine dependence is craving. Regional activation of the brain induced by craving for nicotine was evaluated by using functional magnetic resonance imaging to investigate neuroanatomical site of smoking craving. Method:A smoker who satisfied DSM-IV criteria for nicotine dependence and a non smoker was studied. MRI data were acquired on a 1.5T Magnetom Vision Plus with a head volume coil. Two sets of visual stimuli were presented to subjects in a random manner. One was the film scenes of inducing smoking craving and the other was neutral stimuli not related to smoking. There were two fMRI sessions before and after smoking or sham smoking. Data were analyzed using SPM99. Results:fMRI showed significant activated area in anterior cingulate and medial frontal lobes in the smoker during smoking craving. Right dorsolateral prefrontal cortex and parietal lobes were activated in the control during visual stimulation before smoking. After smoking, there was no brain activation during visual stimulation in both of smoker and non smoker. Conclusion:Metabolic activity of the anterior cingulate and medial frontal lobes increased during craving for smoking. This result suggests that fMRI may be a valuable tool in the identification of neurobiological process of craving.

• Journal of Preventive Medicine and Public Health
• /
• v.51 no.4
• /
• pp.188-195
• /
• 2018

Objectives: This study aimed to examine the level of dementia knowledge of older Korean adults living alone in rural areas and to identify related factors. Methods: A cross-sectional descriptive design was applied. The participants were 231 older adults living alone who were recruited from 12 of the 13 primary health care posts in the rural area of Chuncheon. Participants' level of dementia knowledge was assessed using the Dementia Knowledge Scale. Data were analyzed using descriptive statistics, and the t-test, analysis of variance, chi-square test, and Mann-Whitney test were applied. Results: Participants' mean age was $77.3{\pm}5.4$ years, and women comprised 79.7% of the sample. Over half of the participants (61.9%) had no formal education, and all the participants were enrolled in Medical Aid. The participants' average percentage of correct answers was 61.6%. The highest rate (94.4%) was for the item "Dementia can change one's personal character." The item with the lowest proportion of correct answers was "Dementia is not treatable" (23.4%). Dementia knowledge was significantly associated with age, education, health coverage, source of living expenses, and dementia risk. Conclusions: Dementia knowledge among Korean rural older adults living alone was relatively low. Participants' misconceptions about symptoms and treatment could hinder them from seeking early treatment. The results of this study suggest the need for active outreach and health care delivery for rural older adults living alone in South Korea.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2005.05b
• /
• pp.178-182
• /
• 2005

In the forthcoming 21C, the development of cultural lives depends on that the water demand will increase or not. On the opposite site of that circumstance, many factors of the small watersheds will influence directly on how to cover the surface of watersheds with land use, no planning developing watersheds, and the rearrangement of small rivers. Especially as the extraordinary climatic Phenomena, exhaust of $CO_2$ and destruction of 03 layer, water resource and water foresting content of the small watersheds will be decreased by confusing on the malting a plan of water resources. For example, those are Typhoon Rusa in 2002, Typhoon Maemi in 2003 and heavy storms in 2004. This study area has three group and one of them having three small watersheds, total five small watersheds. That is, Sabukmyeon small watersheds in Chuncheon, Three small watersheds in Wonju(Jeoncheon, Jupocheon and Hasunamcheon), and Suipcheon in Yanggu-Gun which are located far away each other three group and different precipitation data. According to the land use such as dry field(or farm), rice field, forest land. building site and others in small watersheds, the amount of runoff will be impacted by monthly precipitation. The comparison between the runoff was getting from Kajiyama Formula and calculated runoff from multi-linear regressed equations by land use Percentage was performed with different precipitation data and different small watersheds. Its correlations which are estimated by coefficient of correlation will be accepted or not, as approached 1.0000 values. As the monthly water resources amount is estimated by multi-linear regressed equations with different precipitation data and different small watersheds having no gauging station, we make a plan in order to demand and supply the water quantity from small river watersheds during return periods.

• Annals of Clinical Neurophysiology
• /
• v.20 no.2
• /
• pp.79-84
• /
• 2018

Background: Pulsatility of cerebral arteries and aortic stiffness have been associated with white matter hyperintensities (WMH). We explored which is better correlated with the severity of WMH in a population with acute lacunar infarct. Methods: We included patients with acute small subcortical infarcts who underwent transcranial Doppler (TCD) and brachial ankle pulse wave velocity (baPWV). Exclusion criteria were any stenosis or occlusion on major cerebral arteries on magnetic resonance angiography; poor temporal insonation windows; ankle brachial index < 0.9; and atrial fibrillation. We assessed the performance of the pulsatility index of bilateral middle cerebral arteries (PI-MCA) and baPWV for predicting moderate-to-severe WMH, defined as an Age Related White Matter Changes score > 5, and then sought to find independent predictors using binary logistic regression analysis. Results: Eighty-three patients (56 males, mean age $61.5{\pm}11.4$) participated in the study. Uni-variate analysis showed old age and high PI-MCA were significantly correlated with moderate-to-severe WMH. However, baPWV was not associated with the severity of WMH. Multivariate analysis revealed old age (odds ratio per 1-year increase, 1.068; p = 0.044) and upper tertile of PI-MCA (odds ratio, 5.138; p = 0.049) were independently associated with moderate-to-severe WMH. Receiver-operating characteristics showed PI-MCA differentiated those with and without moderate-to-severe WMH with an area under the curve of 0.719. Conclusions: PI-MCA derived from TCD was better correlated with the severity of WMH than baPWV in a population with lacunar infarction. Pulsatility of cerebral arteries may better predict cerebral small vessel disease than the aortic stiffness index.

• Magazine of the Korean Society of Agricultural Engineers
• /
• v.45 no.5
• /
• pp.85-96
• /
• 2003

The Revised Universal Soil Loss Equation (RUSLE) has been used in over 100 countries to estimate potential long-term soil erosion from the field. However, the RUSLE estimated soil erosion cannot be used to estimate the sediment delivered to the stream networks. For an effective erosion control, it is necessary to compute sediment delivery ratio (SDR) for watershed and sediment yield at watershed outlet. Thus, the Sediment Assessment Tool for Effective Erosion Control (SATEEC) was developed in this study to compute the sediment yield at any point in the watershed. To compute spatially distributed sediment yield map, the RUSLE was first integrated with the ArcView GIS and three area based sediment delivery ratio methods were incorporated in the SATEEC. The SATEEC was applied to the Bangdong watershed, Chuncheon, Gangwon Province to demonstrate how it can be used to estimate soil loss and sediment yield for a watershed. The sediment yield using USDA SDR method is 8,544 ton/year and 4,949 ton/year with the method by Boyce. Thus, use of watershed specific SDR is highly recommended when comparing the estimated sediment yield with the measured sediment data. The SATEEC was applied with hypothetical cropping scenario and it was found that the SATEEC can be used to assess the impacts of different management on the sediment delivered to the stream networks and to find the sediment source areas for a reach of interest. The SATEEC is an efficient tool to find the best erosion control practices with its easy-to-use interface.

• Journal of The Korean Society of Agricultural Engineers
• /
• v.60 no.6
• /
• pp.121-131
• /
• 2018

Climate change has caused changes in environmental factors that have a direct impact on agriculture such as temperature and precipitation. The meteorological disaster that has the greatest impact on agriculture is drought, and its forecasts are closely related to agricultural production and water supply. In the case of terrestrial data, the accuracy of the spatial map obtained by interpolating the each point data is lowered because it is based on the point observation. Therefore, acquisition of various meteorological data through satellite imagery can complement this terrestrial based drought monitoring. In this study, Evaporative Stress Index (ESI) was used as satellite data for drought determination. The ESI was developed by NASA and USDA, and is calculated through thermal observations of GOES satellites, MODIS, Landsat 5, 7 and 8. We will identify the difference between ESI and other satellite-based drought assessment indices (Vegetation Health Index, VHI, Leaf Area Index, LAI, Enhanced Vegetation Index, EVI), and use it to analyze the drought in South Korea, and examines the applicability of ESI as a new indicator of agricultural drought monitoring.