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직선 및 회전 보행 시 편마비에 따른 고령자의 보행 특성 변화
정호현,이범기,전경진,임도형,Jung, HoHyun,Lee, BumKee,Chun, Kyeong Jin,Lim, Dohyung 대한의용생체공학회 2014 의공학회지 Vol.35 No.2
Little information is available about the characteristics in revolution gait of hemiplegic elderly, which is frequently represented in daily life. It is also hard to elucidate purely the characteristics due to hemiplegia because of no consideration of aging factors. The aim of study is to identify the alteration characteristics of lower extremity joint angles in both straight and revolution gaits together due to hemiplegia through comparing healthy with hemiplegic elderly. Following Institutional Review Board approval, twelve healthy and hemiplegic elderly were participated and the center of body mass (COM) and lower extremity joint angles were measured during straight and revolution gaits using a computer-aided video motion capture system. The results showed that the gait characteristics were generally altered in both straight and revolution gaits due to hemiplegia (p < 0.05). The gait characteristics were then different between the straight and revolution gaits each other. This study may be valuable by identifying for the first time the alterations of the lower extremity joint angles in both straight and revolution gaits due to pure hemiplegia through comparing healthy elderly with hemiplegic elderly.
Alterations of Relative Muscle Contribution Induced by Hemiplegia: Straight and Turning Gaits
정호현,고창용,김정성,이범기,임도형 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Little information is available about the characteristics in the turning gait of hemiplegic elderly, which occurs frequently in daily life. It is also difficult to examine the altered characteristics due purely to hemiplegia because of no consideration of aging-related factors. The aim of this study was to identify the altered characteristics of relative muscle activation in both straight and turning gaits together due to hemiplegia, through comparing healthy and hemiplegic elderly. Six healthy elderly and six hemiplegic elderly were participated. The center of body mass (COM) and the lower extremity joint angles were measured during straight and turning gaits at self-selected speed, using a motion capture system. A surface wireless electromyogram (EMG) system was used together to identify muscle contributions. Mediolateral (ML) sways of upper-body in hemiplegic elderly were ~174% for straight gait and ~26% for turning gait. Lower extremity joint angles in hemiplegic elderly were generally reduced by ~60-70% for both gaits. Muscle co-activation and relative muscle contributions were generally altered at all phases in hemiplegic elderly, but the patterns were different between straight and turning gaits. This study confirmed that the ML sways of hemiplegic elderly moved towards the nonparetic side more and joint angles showed large decreases. Muscles acted with different contributions, depending on the gait.
정호현,안호영,박진우,김형우,김상석,이양원,최철웅 한국측량학회 2015 한국측량학회지 Vol.33 No.6
This study examined the feasibility of using an automatic lens distortion correction (ALDC) camera as the payload for a photogrammetric unmanned aerial vehicle (UAV) system. First, lens distortion for the interior orientation (IO) parameters was estimated. Although previous studies have largely ignored decentering distortion, this study revealed that more than 50% of the distortion of the ALDC camera was caused by decentering distortion. Second, we compared the accuracy of bundle adjustment for camera calibration using three image types: raw imagery without the ALDC option; imagery corrected using lens profiles; and imagery with the ALDC option. The results of image triangulation, the digital terrain model (DTM), and the orthoimage using the IO parameters for the ALDC camera were similar to or slightly better than the results using self-calibration. These results confirm that the ALDC camera can be used in a photogrammetric UAV system using only self-calibration.
Single Dose Toxicity of Chukyu (spine-healing) Pharmacopuncture Injection in the Muscle of Rats
정호현,김성철,조성훈,이은용,이승덕,안성훈 대한약침학회 2014 Journal of pharmacopuncture Vol.17 No.1
Objectives: This study was performed to analyze the single dose toxicity of Chukyu (spine-healing) pharmacopuncture. Methods: All experiments were conducted at the Biotoxtech, an institution authorized to perform non-clinical studies under the regulations of Good Laboratory Practice (GLP) regulations. Sprague-Dawley rats were chosen for the pilot study. Doses of Chukyu (spine-healing) pharmacopuncture, 0.1, 0.5 and 1.0 mL, were administered to the experimental groups, and a dose of normal saline solution, 1.0 mL, was administered to the control group. This study was conducted under the approval of the Institutional Animal Ethic Committee. Results: No deaths or abnormalities occurred in any of the four groups. No significant changes in weight, hematological parameters or clinical chemistry between the control group and the experimental groups were observed. To check for abnormalities in organs and tissues, we used microscopy to examine representative histological sections of each specified organ; the results showed no significant differences in any of the organs or tissues except in one case, where interstitial infiltrating macrophages were found in one female rat in the 0.5-mL/animal experimental group. Conclusion: The above findings suggest that treatment with Chukyu (spine-healing) pharmacopuncture is relatively safe. Further studies on this subject are needed to yield more concrete evidence.
정호현,이상미,이종철,박만용,김동웅,송봉권,김성철 대한침구의학회 2013 대한침구의학회지 Vol.25 No.4
Objectives : Weight loss and loss of appetite in amyotrophic lateral sclerosis patients arecommon symptoms, these are associated with survival as well as nutritional condition. Thechanges in weight and appetite were reported after treatment using Megestrol acetate andKorean medical treatments. Methods : Amyotrophic lateral sclerosis patient with weight loss and loss of appetite weretreated by administering megestrol acetate a known anti-malignant tumor agent and Koreanmedical treatments such as acupuncture, pharmacopuncture and herbal medicine. Thechanges in weight and appetite were checked using body mass index(BMI) and simplifiednutritional appetite questionnaire(SNAQ). Results : There was a more than 17 kg increase in weight. BMI increased from 15.94 kg/㎡ to21.97 kg/㎡ and SNAQ score increased from 7 to 16. Owing to several side effects, Megestrolacetate was stopped after which only Korean medical treatments were provided. After whichthe lasting effects in BMI and appetite could be seen. Conclusion : There are few studies on weight loss and loss of appetite in ALS patients. Usingonly megestrol acetate can cause several considerable side effects. Which respect to this, thefindings in this study could open up new clinical guideline possibilities.