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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 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.
정민기,김성민,김명주,이종호,명훈,김명진,Jung, Min Gi,Kim, Soung Min,Kim, Myung Joo,Lee, Jong Ho,Myoung, Hoon,Kim, Myung Jin 대한악안면성형재건외과학회 2013 Maxillofacial Plastic Reconstructive Surgery Vol.35 No.3
Purpose: The aim of this study is to analyze the series of panoramic radiograph of implant patients using the system to measure peri-implant crestal bone loss according to the elapsed time from fixture installation time to more than three years. Methods: Choose 10 patients having 45 implant fixtures installed, which have series of panoramic radiograph in the period to be analyzed by the system. Then, calculated the crestal bone depth and statistics and selected the implant in concerned by clicking the implant of image shown on the monitor by the implemented pattern recognition system. Then, the system recognized the x, y coordination of the implant and peri-implant alveolar crest, and calculated the distance between the approximated line of implant fixture and alveolar crest. By applying pattern recognition to periodic panoramic radiographs, we attained the results and made a comparison with the results of preceded articles concerning peri-implant marginal bone loss. Analyzing peri-implant crestal bone loss in a regression analysis periodic filmed panoramic radiograph, logarithmic approximation had highest $R^2$ value, and the equation is as shown below. $y=0.245Logx{\pm}0.42$, $R^2=0.53$, unit: month (x), mm (y) Results: Panoramic radiograph is a more wide-scoped view compared with the periapical radiograph in the same resolution. Therefore, there was not enough information in the radiograph in local area. Anterior portion of many radiographs was out of the focal trough and blurred precluding the accurate recognition by the system, and many implants were overlapped with the adjacent structures, in which the alveolar crest was impossible to find. Conclusion: Considering the earlier objective and error, we expect better results from an analysis of periapical radiograph than panoramic radiograph. Implementing additional function, we expect high extensibility of pattern recognition system as a diagnostic tool to evaluate implant-bone integration, calculate length from fixture to inferior alveolar nerve, and from fixture to base of the maxillary sinus.
정민기,이문진,이은방 한국항해항만학회 2018 한국항해항만학회지 Vol.42 No.2
Despite the development of safety measures and improvements in preventive systems technologies, maritime traffic accidents that involve ships carrying hazardous and noxious substances (HNS) continuously occur owing to increased amount of HNS goods transported and the growing number of HNS fleet. To prevent maritime traffic accidents involving ships carrying HNS, this study proposes an intuitive route risk assessment technique using risk contours that can be visually and quantitatively analyzed. The proposed technique offers continuous information based on quantified values. It determines and structures route risk factors classified as absolute danger, absolute factors, and influential factors within the assessment area. The route risk is assessed in accordance with the proposed algorithmic procedures by means of contour maps overlaid on electronic charts for visualization. To verify the effectiveness of the proposed route risk assessment technique, experimental case studies under various conditions were conducted to compare results obtained by the proposed technique to actual route plans used by five representative companies operating the model ship carrying HNS. This technique is beneficial not only for assessing the route risk of ships carrying HNS, but also for identifying better route options such as recommended routes and enhancing navigation safety. Furthermore, this technique can be used to develop optimized route plans for current maritime conditions in addition to future autonomous navigation application.