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金尙國,姜東洹,金昇一,徐再均,金耕知,孫斗玉,鮮于攝,崔榮烈,尹宇相,金亨燉,方永鎭,李錫元 慶熙大學校 體育科學大學 1988 體育科學論叢 Vol.- No.1
The purpose of this study was to compare the characterists and change in physique and physical function by college student of physical education major(287males and 40 females of age groups ranging from 18 to 26). The results were as following; 1) The characteristics of physique and physical function by sex and age. ① The male group of 18yrs old showed higher values in Height, Weight, Upper Limb Length, Strength, Flexibility, and Vital Capacity than any other groups, but female group showed lower values in Height, Weight, Chest Girth, Lower Limb Length, Thigh, Girth, Calf Girth and all of the Physical function. ② The male group of 19yrs old showed high values in power and Agility, then female group showed in Strength and Flexibility. ③ The male group of 20yrs old showed the lower values in Weight, Waist Girth, Upper Limb Length, Fore Arm Girth, Thigh Girh.Calf Girth, Vital Capacity, and female group are very lowed in Upper Arm Lenght, Fore Arm Length, Skin Fold Thickness and 5 minute Run. ④ The male group of 23yrs old showed the high values in Upper Arm Girth, Fore Arm Girth and Balance, and then female group higher in Weight, Chest Girth, Waist Girth, Upper Arm Girth, Fore Arm Girth, Thigh Girth, Power, Shuttle Run, Balance and vital capacity than any other age Groups. ⑤ In male group, Chest Girth, and Blood Pressure were significantly related, and Side Step and Trunk Extension were nagatively related to the age at 0.1% level, and then in female group, Sargent Jump, Standing Long Jump and Vital Capacity were showed a significantly related at 0.5% level. 2) The difference of physique and physical function between male and female by age. ① Everage difference in whole physique items except skinfold thickness was 9.8%, and that 21.1% in all of physical function except Trunk Flextion between male and female group subjects. ② About the ages, the 18yrs old male group showed the 22.8% higher values of 26 items, but 22yrs old male group were about 12.2% in 23 items, thus it is very lower than any other groups. 3) The difference of physique and physical function between General group and physical education group in age-matched. ① In the physique male physical education groups showed about 7% higher in Weight, Chest Girth, Upper Limb Length, Upper Arm Girth, Thigh Girth, and female group showed about 7% higher in Weight and Upper Limb Length. ② In the physical function, Trunk Flextion, 5 minute Run, and Blood Pressure(Diastolic) were about 8% high values in whole group, and female group showed about 8% higher in Standing Long Jump, Shuttle Run, and Trunk Extension. ③ In 22yrs old male and female physical education group were very dominated in physique and physical function than the other age group against the general group.
Sun, Nan,Andress, William F.,Woo, Kyoung-Ho,Ham, Don-Hee The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.3
We review three examples (an on-chip transmission line resonator [1], a phase-locked loop [2], and an analog-to-digital converter [3]) of design tradeoffs which can in fact be circumvented; the key in each case is that the parameters that seem to trade off with each other are actually separated in time or space. This paper is an attempt to present these designs in such a way that this common approach can hopefully be applied to other circuits. We note reader that this paper is not a new contribution, but a review in which we highlight the common theme from our published works [1-3]. We published a similar paper [4], which, however, used only two examples from [1] and [2]. With the newly added content from [3] in the list of our examples, the present paper offers an expanded scope.
Support Vector Machine Based Bearing Fault Diagnosis for Induction Motors Using Vibration Signals
Don-Ha Hwang,Young-Woo Youn,Jong-Ho Sun,Kyeong-Ho Choi,Jong-Ho Lee,Yong-Hwa Kim 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
In this paper, we propose a new method for detecting bearing faults using vibration signals. The proposed method is based on support vector machines (SVMs), which treat the harmonics of fault-related frequencies from vibration signals as fault indices. Using SVMs, the cross-validations are used for a training process, and a two-stage classification process is used for detecting bearing faults and their status. The proposed approach is applied to outer-race bearing fault detection in threephase squirrel-cage induction motors. The experimental results show that the proposed method can effectively identify the bearing faults and their status, hence improving the accuracy of fault diagnosis.
Robust Diagnosis Algorithm for Identifying Broken Rotor Bar Faults in Induction Motors
Don-Ha Hwang,Young-Woo Youn,Jong-Ho Sun,Yong-Hwa Kim 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
This paper proposes a new diagnosis algorithm to detect broken rotor bars (BRBs) faults in induction motors. The proposed algorithm is composed of a frequency signal dimension order (FSDO) estimator and a fault decision module. The FSDO estimator finds a number of fault-related frequencies in the stator current signature. In the fault decision module, the fault diagnostic index from the FSDO estimator is used depending on the load conditions of the induction motors. Experimental results obtained in a 75 kW three-phase squirrel-cage induction motor show that the proposed diagnosis algorithm is capable of detecting BRB faults with an accuracy that is superior to a zoom multiple signal classification (ZMUSIC) and a zoom estimation of signal parameters via rotational invariance techniques (ZESPRIT).
운동종목 특성에 따른 Force-Velocity Curve와 근지구력 발현 형태의 차이에 관한 연구
선우섭,전정우,김형돈,최영렬 경희대학교 사회체육연구소 1995 體育科學論叢 Vol.- No.8
The purpose of this study was to compare the anthropometric parameters, anaerobic power, isometric peak torque, and isokinetic muscle performance of the college male taekwondo players, female taekwondo players, and female soccer players. Sargent jump was estimated for the anaerobic power. Maximal voluntary force in knee extension was measured before and after a muscle endurance test (MET) by using a Cybex 350 isokinetic dynamometer isometrically at 90˚and con-centrically at the angular velocity of 30˚, 120˚, and 270˚·S-¹, The MET conists of 30 maximal concentric muscle actions at the angular velocity of 270˚·S-¹. The significant group differences were observed in %fat(p<.05) and the male taekwondo players demonstrated the highest mean values. A significant difference (p<.05) was observed in sargent jump between male taekwondo players and female players. The male taekwondo players showed the highest mean value, followed by female soccer and female taekwondo players. In isometric and isokinetic muscular strength test the male taekwondo players showed a significant difference(p<.05) from the female athletes before MET and no differences were found between female taekwondo and soccer players. The similar results in isometric and isokinetic muscular strength were observed after MET except that no significant differences exist between male taekwondo and female soccer players. These results indicates that the correlation exists between sargent jump and knee extension forces. Male taekwondo players showed a significant differences from the female players in total work of MET(p<.01). However, no significant difference were observed between the subjects in knee extension endurance ratio and flexion endurance ratio and recovery ratio. The female taekwondo players showed statistically higher values compared to female soccer and male taekwondo players(p<.05) in recovery ratio of MET. Therefore, it is assumed that there exist gender differences in the muscular endurance, and further research is needed on this issue.
禹善弼,金亨燉 慶熙大學校 體育科學大學 1992 體育科學論叢 Vol.- No.5
The data were collected from compararative analysis the man's double final match of between korean team and foreign team 1. among the 597 trying of korean team'n attacks korean players used smash 166(27.5% ), drive 76(12.7%), under clear 71(11.8% ), high clear 8.5(2.85% ), service 4.5(1.5%) , cross net 0(0% ), on the other hand, foreign players used under clear 110.5(35.9%) smash 87(14.1% ), drive 78(12.8%), drop 13(2.1%), high clear 11(1.7%), cross net 1.5(0.4%) among their 615 attacks in turn. 2. In case of point stroke korean players used smash 22(33%), push 14(21.5%), among their 65 attecks, and foreign plyaers used smash 10(26.3%), push 9(23.6% ), drive 5 (13.1%)among their 38 attecks in turn. 3. In case of point area throgh position, korean team was shown E, B, F and foreign team was showan E, B, C in turn 4. Losing point area was shown F, G, E dn korean team, and shown B, F, E on foreign team in turn.
Sun, Jong-Ho,Youn, Young-Woo,Hwang, Don-Ha,Kang, Dong-Sik The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.1
The present study describes the considerations on the long-term reliability of the on-line partial discharge (PD) ceramic sensor for thermal power generators. Voltage acceleration aging tests were carried out under continuous and impulsive thermal aging at more than $100^{\circ}C$, considering the practical service environment. Experimental results show that the sensors have a life that could last for more than 100 years, excellent dielectric characteristics, and insulation strength. In addition, the ceramic on-line PD sensors were installed in a thermal power generator in Korea for demonstration. The results of the PD calibration and test voltage application prove that the on-line ceramic sensors have satisfactory performances for on-line PD measurement.
A Method to Monitor Vacuum Degree Using Capacitive Partial Discharge Coupler
Sun, Jong-Ho,Youn, Young-Woo,Hwang, Don-Ha,Yi, Sang-Hwa,Kang, Dong-Sik The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.6
Internal pressure of vacuum interrupter (VI) is one of the most important parameters in VI operation and may increase due to the outgassing from the materials inside VI or gas permeation through metal flange or ceramic vessel. The increase of the pressure above a certain level leads to the failures of switching or insulation. Therefore, an effective pressure check of VI is essential and an analysis of partial discharge (PD) characteristics is an effective monitoring method to identify the degree of the internal pressure of VI. This paper introduces a research work on monitoring the internal pressure of VI by analyzing PDs which were measured using a capacitive PD coupler. The authors have developed cost effective capacitive coupler based on the ceramic material that has an excellent insulation properties and the main component of the capacitive coupler is made by SrTiO3. Detectable internal pressure range and distinguishability of the internal pressure of VI were investigated. From the PD tests results, the internal pressure range, from $10^{-2}$ torr to 500 torr, can be monitored by PD measurements using the capacitive coupler and PD inception voltage (PDIV) follows the Paschen's law. In addition, rise time of PD pulse at 13.2kV decreases with the increase of the internal pressure of VI.