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鄭源勳 圓光大學校大學院 1981 學位論叢 Vol.6-2 No.-
For the study on the relation between movement sensory grasp ability and I.Q. I devided the subjects, 226 middle schoolboys, between higher and lower I.Q. groups. And then I measured the following movement sensory grasp abilities before and after motion burden of twice 400 meters : 1. Skin Sense of Pressure Point 2. Space Sense 3. Position Sense 4. Sense of Sustained Hour of Movement 5. Pressure-resistance Sense 6. Weight-holding Sense 7. Direction Sense 8. Distance Sense The comparative analysis of the statistics between groups Showed a general tendency that the higher I.Q. group has more sensory grasp abilities than the lower I.Q. group. Only a deviation from the general tendency was recorded for direction sense. 1. Especially outstanding superiority of the higher I.Q. group was recorded before motion burden for the senses of position, pressure-resistance, weigh-holding and of distance. The respective error distance between the groups was 0.66° from 45° angle, 20.8g,II g, and 14.1㎝. 2. The higher I.Q. group after motion burden shortened the error distances of skin sense of pressure-point, space sense, position sense, pressure-resistance sense, respectively by 0.15㎝. O.21㎝ O.2° from 135° angle, 15.1g, 12.3g and 10.3㎝. 3. Some superiority of the higher I.Q. group before motion burden was shown for the senses of pressure-point, space, position, and for sustained hour of movement. The error distance for the senses was O.03㎝. O.l4㎝, 0.160° from 135° angle, and O.16 seconds, respectively. 4. Some superiority of the higher I.Q. group also after motin burden was recorded for position sense by 0.36° from 45° angle and for sense of sustained hour of movement by 0.19 seconds.
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정원훈,한성희,신미경 원광대학교 생활자원개발연구소 1999 생활자원개발연구 Vol.1 No.-
910 college students were studied in research in regards of use of fast food and value system of college students. In BMI, it seemed to be normal in male students, in the meantime, the female students seemed to be relatively weaker, most of them seemed to be healthy themselves, the dining habit showed that it was irregular and passing meals, especially, the passing of breakfast was required to be improved. 'No Time' took the most part out of the reasons, snacks and crackers occupied 68.7% out of students, which showed a tendency that the passing meals was replaced by the snacks and crackers. The use of fast food shop show that the time of use was irregular, simple, convenient', it was about 2,000-4,000 Won for each use. The types of food showed that meat was the most preferred one for the feeling of fat saturation, in the meantime, the use of local brand fast food shop was a positive object to them.
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정원훈,김나용,김동건,김봉환 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.6
In this study, a numerical analysis was performed as steady-state analysis to investigate the effect of interference between the propellers of the hexa-copter. As the distance increases, there is little change in thrust, but when a propeller close to the reference propeller rotates, it was confirmed that the thrust decreased due to the interference effect. Unsteady state analysis was performed to confirm the influence of the hexa-copter fuselage. If there is a fuselage, the thrust was predicted to increase by about 4.97% due to the ground effect. If the design parameters are established considering the effect of the fuselage of the hexa-copter, it is expected to be used for basic design and application design in the future.
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정원훈,김나용,김동건,배강열,김봉환 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.11
To effectively dissipate the heat generated by an inverter-type arc welding machine, we propose the design of a heat dissipation mechanism that can efficiently dissipate the heat inside the arc welding machine through a heat sink. To this end, the effect of heat dissipation on the shape change of the heat sink was confirmed through thermal fluid analyses. In addition, the heat dissipation effect, according to the distance between the coils, was identified and reflected in the internal design of the arc-welding machine. Results of the thermal flow analyses confirmed that the all-in-one type heat sink achieved a superior heat dissipation effect, as compared with the wing-type heat sink. Furthermore, as the distance between the coils increased, the effect of the center and lower cooling fan on the concentrated heat dissipation effect decreased; therefore, a distance of 40 mm between the coils is deemed suitable.
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하천 측량용 헥사콥터의 단일로터에 대한 제자리 비행 성능 연구
정원훈,김봉환,민경무,차엘리,박근우 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.8
In this study, an experimental device was fabricated to evaluate the hovering flight performance of a single rotor on a hexacopter used for river surveillance, and a thrust performance test was conducted. In addition, the 3D profile of the propeller was extracted by 3D scanning and CFD analysis was performed using ANSYS CFD 14.5 based on the extracted 3D model of the propeller. The aerodynamic characteristics were compared with the results of the performance tests and CFD analysis, and the vortex structure corresponding to each motor rotational speed in revolutions per minute (rpm) was identified. In the future, we plan to provide valuable data for multicopter propeller design and performance verification.
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정원훈,신미경 대한보건협회 1998 대한보건연구 Vol.24 No.1
아침식사를 거르는 결식학생과 정상적으로 3식을 하는 남녀 대학생 310명을 대상으로 부하를 가한 후에 자각적 피로증상 검사와 Flicker test, 뇨검사를 실시하여 피로의 정도와 생리적 반응을 알아 보았다. 1. 자각적 피로증상 부분에서 여학생 결식집단이 정상식 집단보다 신체적 증상에서 높은 피로증가를 보였고, 또한 운동 전과 운동 후 비교에서도 운동 후에 32%의 높은 피로도를 보였다. 2. Flicker test의 집단간 비교는 정상식 집단이 결식집단에 비하여 남학생은 운동 후에, 여학생은 휴식 후에 각각 유의하였고, 운동 전과 운동 후 휴식 후 비교에서는 남학생은 정상식과 결식집단에서 공히 운동 후와 휴식 후 비교에서 유의하게 차이가 났으며, 여학생은 결식집단에서 운동 전과 휴식 후, 운동 후와 휴식 후에 유의있게 차이가 났다(P<0.05). 3. 뇨검사에서 glucose는 negative를 기록하여 변화가 없었으며, Protein은 여학생 집단간 비교에서 결식집단이 정상식 집단에 비하여 운동 후와 휴식 후에서 차이를 보였으며, 운동 전과 운동 후 휴식 후 비교에서는 남녀 결식집단에서 공히 운동 전에 비하여 휴식 후에 유의있는 차이를 보였다(P<0.05). pH는 집단간 비교에서 남녀 모두 정상식 집단보다 결식집단에서 유의있게 낮았으며, 운동 전과 운동 후 휴식 후 비교에서는 특히 남녀 모두 결식집단에서 운동 전과 후, 운동 후와 휴식 후에 유의있게 낮았다(P<005). Urobilinogen은 집단간 유의는 없었으며, 운동 전과 운동 후 휴식 후 비교에서는 남녀 모두 정상식 집단과 결식집단에서 운동 전에 비하여 운동 후에, 그리고 운동 전에 비하여 휴식 후에 유의있는 차이를 보였다(P<0.05). Specific gravity에서는 집단간 유의는 없었으며, 운동 전과 운동 후 휴식 후 비교에서는 남녀 모두 정상식 집단과 결식집단에서 운동 전에 비하여 운동 후에, 운동 전에 비하여 휴식 후에 유의있는 차이를 보였다(P<0.05). 4. 측정과 검사결과에서 보듯이 여학생 결식집단이 피로의 증상과 뇨의 성분변화가 유의있게 더 많이 나타나 정상적인 식사형태가 요망된다. Studied the degree of fatigue and physiologic response through a subjective fatigue symptom test, a flicker test, a urine test after loading to the 310 male and female collegians both who skip their breakfasts and who take regular three meals a day. 1. In a subjective fatigue symptoms, a female group of skipping meals showed a high degree of fatigue as a physical symptom than a group of taking meals regularly and, in a comparison of the case before exercise with the case after exercise, showed the 32% high degree of fatigue in the case after exercise. 2. In a comparison of a flicker test between the groups, a group of taking regular meals, males and females showed considerable differences ofter exercise and after taking a rest respectively. In a comparison of the case before and the one after exercise, and the case after taking a rest, males of both a group of taking regular meals and a group of skipping meals showed the same considerable differences in the case after exercise and the one after taking a rest, and females of a group of skipping meals showed considerable differences the case before exercise and the case after taking a rest, and the case after exercise and the case after taking a rest.(P<0.05) 3. In a urine test, there was not any change, showing negative in glucose and In a comparison of female groups, a group of skipping meals showed considerable differences in protein than a group of taking meals, and in a comparison of the case before exercise and the one after exercise and the case after taking a rest, both male and female of skipping meals showed the same considerable differences after taking a rest than before exercise.(P<0.05) In a comparison between the groups, both male and female groups of skipping meals showed low in pH than the ones of taking regular meals, and in a comparison of the case before exercise and the one after exercise, and the one after taking a rest, especially both male and female groups of skipping meals showed considerably low before and after exercise and after exercise and after taking a rest.(P<0.05) There was not any differences in Urobilinogen between the groups. In a comparison of the case before exercise and the one after exercise, and the one after taking a rest, both male and female groups of taking regular meals and of skipping meals showed considerable differences after exercise than before exercise, and after taking a rest than before exercise.(P<0.05) (4) There was not any differences in specific gravity. In a comparison of the case before exercise and the one after exercise, and the one after taking a rest, both male and female groups of taking regular meals and of skipping meals showed considerable differences after exercise than before exercise, and after taking a rest than before exercise.(P<0.05) 4. As showed from its characters and test results, female group of skipping meals showed considerable changes in fatigue symptom and the elements of urine, so it is required to take regular meals.
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