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김상영,김상수,Kim, Sang-Yeong,Kim, Sang-Su 한국재료학회 2002 한국재료학회지 Vol.12 No.6
Design of microwave absorbers using high frequency properties of fiber reinforced composites are investigated. Two kinds of composite materials (glass and carbon) are used and their complex permittivity and permeability are measured by transmission/reflection technique using network analyzer. Low dielectric constant and nearly zero dielectric loss are determined in glass fiber composite. However, carbon fiber composites show the high dielectric constant and large conduction loss which is increased with anisotropy of fiber arrangement. It is, therefore, proposed that the glass and carbon fiber composites can be used as the impedance transformer (surface layer) and microwave reflector, respectively. By inserting the foam core or honeycomb core (which can be treated as an air layer) between glass and carbon fiber composites, microwave absorption above 10 dB (90% absorbance) in 4-12 GHz can be obtained. The proposed fiber composites laminates with sandwitch structure have high potential as lightweight and high strength microwave absorbers.
김주원(Ju-Won Kim),정형일(Hyeong-Il Jung),김대식(Dae-Sik Kim),소진섭(Jin-Sub So),정연일(Yeon-Il Jung),김상영(Sang-Yeong Kim) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11
KTX 차량은 탈선예방 및 주행안전성 확보를 위해 대차의 횡방향 진동 가속도를 0.6G~0.8G 미만으로 제한하고 있다. 대차에서0.6G~0.8G이상의 횡방향 진동가속도가 5초이상 감지될 경우 차량의 안전을 위해 최고속도를 270 km/h 이하로 제한하게 되며 이는 정시 운행에 지장을 주게 된다. 따라서 정시운행을 위해 어떤 환경에서 KTX 차량에 많은 진동이 발생하는지 확인하고 진동저감을 위해 요구되는 차량, 선로 조건을 찾아내는 것이 필요하다. 본 연구에서는 KTX 차량의 진동발생원인과 해결방안을 찾기 위한 사전연구로서 경부고속선에서 영업 운행하는 KTX차량계측을 통해 1단계구간과 2단계 구간의 진동특성을 비교 하였다. KTX bogies are limited to less than 0.6G ~ 0.8G vibration acceleration in a lateral direction of the balance in order to ensure the driving safety and prevent derailment. If the vibration acceleration in the lateral direction of the 0.6G ~ 0.8G or more is detected for more than 5 seconds in the bogie , That will limit to 270km/h below the maximum speed for the safety of the vehicle and It will give trouble to scheduled operation. Therefore we need to find the cause of the vibration is occurring more. In this study, as a preliminary study to find the vibration occur causes and solutions of the vibration of KTX by measurement of bogie vibrations.
여자대학생의 스미스머신 스쿼트 운동시 스탠스 넓이 및 보조물 높이가 하지 근활성도에 미치는 영향
류종식(Ryu, Jong-Sik),김상영(Kim, Sang-Yeong),김종근(Kim, Jong-Geun) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.5
The purpose of this study was to find out the effect on the lower limb muscle activity by differentiating the width of the stand and the height with using wooden plate during Smith machine squat exercise. In this study, 20 female college students were collected as participants. The width of the standing position was determined from participants by measuring a width of the shoulder, and the squat motion was measured based on 0%, 75%, and 140% of the shoulder width. In addition, the height of the wooden p lates were 0 cm, 3cm, and 6cm. EMG was a ttached to measure the r ight E rector Spinae, Rectus Femoris, Vastus Medialis, Vastus Laterlis, Biceps Femoris, Medial Gastrocnemius, and Tibialis Anterior. The mean(M) and standard deviation(SD) of all measurements were calculated, and one-way ANOVA was used to find significant difference between groups. The post-hoc verification was done using Duncan’s method. The result showed that, first, squat motion based on width of the standing position did not showed a significant difference in other areas, but Vastus Medialis showed significant difference (both decreasing (p<.05) and increasing (p<.05)). Second, squat motion using wooden plates did not showed a significant difference in other areas, but Tibialis Anterior showed a significant difference (both decreasing (p<.05) and increasing (p<.01)). By analyzing the same results, the study suggests that applying different squats by performing appropriate movements to partially enhancing the muscle rather than targeting entire femoral squat movement. It also suggests that, it would be safe and accurate followed by appropriate posture during machine training and free-training.
탈착용 종아리 압박 기구 착용이 여자 대학생들의 등속성 운동 시 하지 근기능에 미치는 영향
류종식(Ryu, Jong-Sik),김차룡(Kim, Cha-Ryong),송남석(Song, Nam-Seok),김상영(Kim, Sang-Yeong),황강민(Hwang, Kang-Min),채원식(Chae, Won-Sik),김종근(Kim, Jong-Geun) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.6
The purpose of this study was to investigate the effect of muscular strength and muscle endurance on the isometric and isokinetic muscular strength of calf compression equipment. The subjects were selected among 18 college students who had no ankle related disorder among 20 subjects. All subjects measured ROM, maximum torque (Peak Torque), and total work of the ankle according to the presence or absence of the compression mechanism. Muscle strength test showed that the peak torque(Nm). Dorsi flexion was 33.41 ± 4.35Nm, 34.66 ± 4.45Nm, and plantar flexion was 120.94 ± 42.24Nm at the lower flexion, respectively, which was not significantly different from 123.97 ± 31.5Nm. Muscle endurance test showed that the total work(Nm). dorsi flexion was lowered from 82.22 ± 8.03Nm to 80.27 ± 7.93Nm, but there was no significant difference. On the other hand, plantar flexion was 237.05 ± 93.64 Nm and 255.94 ± 84.23 Nm, respectively (p<.05). These results suggest that wearing a calf compression equipment and dorsiflexion and flexion exercises will increase the range of static joint motion and improve strength and muscle endurance. In order to improve the ankle joint"s muscular function, Exercise seems to have a positive effect.