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태권도와 인지 중재 프로그램이 경도 우울 노인 여성의 치매위험인자 및 자기효능감에 미치는 영향
정민기,정현훈 한국사회체육학회 2020 한국사회체육학회지 Vol.0 No.79
Purpose: The present study is aimed at investigating the effects of Teakwondo and cognitive intervention program on dementia risk factor and self-efficacy in mild depression of elderly women. Method: Twenty elderly women with mild depression were assigned to Teakwondo & cognitive intervention group (n=10), and control group (n=10). The Taekwondo & cognitive intervention program consisted of program 60min/session, 3 days each per week for 12 weeks. Bodyc omposition & blood pressure, depression, cognitive function, dementia risk factor, and self-efficacy were measured. Results: The results of this study were as follows. First, in body composition & blood pressure, body weight (p=.001), BMI (p=.001), percent body fat (p<.001), SBP (p=.038), and DBP (p<.001) were statistically significant. Second, in dementia risk factor, K-GDS (p<.001), K-MMSE (p=.001), BDNF (p=.007), DHEAs (p=.005), and TG (p=.028) were statistically significant. Third, in self-efficacy, volition (p<.001), effort (p=.002), reliance (p=.013), action (p=.001), and GSES (p<.001) were statistically significant. Fourth, K-GDS and BDNF (r=-.464, p=.039), and DHEAs (r=-.556, p=.011), and GSES (r=-.627, p=.003) showed a negative correlation. Also, KMMSE and BMI (r=-.677, p=.001) presented a negative correlation while K-MMSE and GSES (r=.575, p=.008) showed a positive correlation. Conclusion: These findings suggest that Taekwondo and cognitive interveniotn program may represent an effective intervention strategy for dementia risk factor and self-efficacy in mild depression of elderly women.
A Study on the Visualization of HNS Hazard Levels to Prevent Accidents at Sea in Real-Time
정민기,이문진,이은방 해양환경안전학회 2017 해양환경안전학회지 Vol.23 No.3
In order to develop an HNS safety management system to assess and visualize hazard levels via an automated method, we have conceptualized and configured a sample system. It is designed to quantify the risk of a vessel carrying HNS with a matrix method along navigational route and indicate hazards distribution with a contour map. The basic system which provides a visualized degree of hazards in real time has been introduced for the safe navigation of HNS ships. This is useful not only for decision making and circumstantial judgment but may also be utilized for HNS safety management with a risk base. Moreover, this system could be extended to address the navigational safety of marine traffic as well as of autonomous vessels in the near future if the sensors used are connected with IoT technology.
운동과 인지 중재 프로그램이 경도인지장애 여성 노인의 인지 기능과 좌식 행동 및 건강 관련 삶의 질에 미치는 영향
정민기,정현훈,박상갑 한국운동생리학회 2019 운동과학 Vol.28 No.2
PURPOSE: The purpose of this study was to investigate the effects of exercise and cognitive intervention program on cognitive function, sedentary behavior and health-related quality of life in mild cognitive impairment elderly women with hypertension and obesity. METHODS: Sixteen elderly women were assigned in exercise and cognitive intervention group (n=8), and control group (n=8). The exercise and cognitive intervention program consisted of program 90 min/session, 2 days each week for 12 weeks. RESULTS: In body composition and blood pressure, weight (p=.000), body mass index (p=.000), waist circumference (p=.003), waist hip ratio (p=.032), systolic blood pressure (p=.001), and diastolic blood pressure (p=.006) had a statistically significant. In cognitive function and sedentary behavior and health-related quality of life, K-MMSE (p=.001), sedentary time (p=.000), general health (p=.002), physical function (p=.001), role physical (p=.022), role emotional (p=.001), social function (p=.009), mental health (p=.002), and vitality (p=.011) had a statistically significant. CONCLUSIONS: These findings suggest that exercise and cognitive intervention program may represent an effective intervention strategy for cognitive function and sedentary behavior and health-related quality of life.
A study on kinematic changes in treadmill walking using AI-based overground walking controller
정민기 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
The treadmill is frequently used in gait analysis due to controlled and convenient experimental conditions. However, previous studies have analyzed differences in lower limb kinematics and kinetics between overground and treadmill walking. These differences have been reported that came from psychological causes such as fear, air resistance, visual information and treadmill speed errors due to human-treadmill interaction. The purpose of this study was to investigate kinematic differences between overground and treadmill walking, excluding psychological causes, through an AI-based gait controller in a dynamic simulation environment. The gait controller consists of a two-layer neural network, and it was trained by deep reinforcement learning to track a reference motion. The reference motion was made through the experiment of walking on the ground by a subject. This gait controller was tested overground walking and treadmill walking in the simulation. Comparing kinematics in overground walking and treadmill walking, the RMS difference of the knee flexion angle and hip flexion angle were 0.15 degrees and 0.12 degrees, respectively. The peak treadmill speed error during treadmill walking was 14 mm/s, which caused the kinematic difference.
정민기 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Despite its highest theoretical capacity, the applications of the silicon anode are still limited by severe capacity fading, which is due to pulverization of the Si particles through volume change during charge and discharge. To deal with those complications, Si nanoparticles are embedded in micro-sized porous carbon spheres (Si-MCS) via a facile hydrothermal process, in order to provide a stiff carbon framework that functions as a cage to hold the pulverized silicon pieces. The carbon framework subsequently allows these silicon pieces to rearrange themselves in restricted domains within the sphere. Hence, it demonstrates excellent cyclability, high rate capability and high specific volumetric capacity on account of increased tap density. The lithium-ion battery using the new Si-MCS anode and commercial LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> cathode shows a high specific energy density which is considerably higher than that of commercial graphite anodes.