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최종기,박진세,이병인,신경진,유선미,김효은,장우영,김지선,윤진영,오응석 대한신경과학회 2019 Journal of Clinical Neurology Vol.15 No.2
Background and Purpose Gait impairment in patients with cognitive decline has received considerable attention over the past several decades. However, gait disturbance in dementia is often underdiagnosed. The Mini Mental State Examination (MMSE) is the most widely used screening test for dementia, and the Montreal Cognitive Assessment (MoCA) has been developed for more accurate assessments of mild cognitive impairment (MCI). The purpose of this study was to determine the correlation between gait status and the scores on these screening tests for dementia. Methods We recruited 18 patients with MCI and 19 patients with early-stage dementia. All of the participants were examined using the Korean versions of the MMSE and MoCA developed for screening dementia (MMSE-DS and MoCA-K, respectively) and a neuropsychological test to determine cognitive function. A three-dimensional motion-capture system was used to perform objective measurements of gait in all participants. We evaluated the correlation between the screening scores and gait parameters. Results The MoCA-K score was significantly correlated with the walking speed (r=0.408, p< 0.05) and stride length (r=0.334, p<0.05). After adjusting for age, the MoCA-K score remained correlated with the walking speed (r=0.331, p<0.05), whereas the MMSE-DS score (r=0.264, p=0.11) and stride length (r=0.206, p=0.22) were not. The neuropsychological test revealed that walking speed and stride length were significantly correlated with memory and frontal lobe function. Conclusions We found that the MoCA-K reflects the gait status in patients with cognitive decline more accurately than does the MMSE-DS. Our results suggest that the MoCA-K has more advantages than the MMSE-DS as a screening tool for dementia.
사후 고장분석에 기초한 송전케이블 선로정수 산정기준의 개선
최종기,이유진,이상영,김형근,신정훈 대한전기학회 2020 전기학회논문지 Vol.69 No.11
The symmetrical impedances of a transmission line are important parameters for both accurate fault calculation and reliable protective relay setting. While overhead line impedance calculation results generally agree well with measured impedances at reasonable accuracy, underground transmission line impedances do not agree well very often. So there has been an urgent need for better guideline to determine which impedance should be used among measured and calculated cable transmission line impedances. In this paper, various post-fault analysis of 154kV cable transmission lines were conducted to improve the current KEPCO guideline based on sound technical background as possible.