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Red Ginseng Supplementation More Effectively Alleviates Psychological than Physical Fatigue
Choi, Ji-Young,Woo, Tae-Sun,Yoon, Seo-Young,Dela Pena, Ike Campomayor,Choi, Yoon-Jung,Ahn, Hyung-Seok,Lee, Yong-Soo,Yu, Gu-Yong,Cheong, Jae-Hoon The Korean Society of Ginseng 2011 Journal of Ginseng Research Vol.35 No.3
Red ginseng (RG, the extract of Panax ginseng Meyer) has various biological and psychological activities and may also alleviate fatigue-related disorders. The present study was undertaken to evaluate what kind of fatigue red ginseng alleviate. Animals were orally administered with 50, 100, 200, 400 mg/kg of RG for 7 days. Before experiments were performed. Physiological stress (swimming, rotarod, and wire test) are behavioral parameters used to represent physical fatigue. Restraint stress and electric field test to a certain degree, induce psychological fatigue in animals. Plasma concentration of lactate and corticosterone (CORT) were also measured after these behavioral assays. RG supplementation (100 mg/kg) increased movement duration and rearing frequency of restrainted mice in comparison with control. 100 and 200 mg/kg of RG increased swimming time in cold water ($8{\pm}4^{\circ}C$) while at 100 mg/kg, RG increased electric field crossing over frequencies. 50, 100 and 200 mg/kg RG prolonged running time on the rotarod and at 100 mg/kg, it increased balancing time on the wire. RG at those doses also reduced falling frequencies. RG supplementation decreased plasma CORT levels, which was increased by stress. Lactate levels were not significantly altered. These results suggest that RG supplementation can alleviate more the damages induced by psychological than physical fatigue.
Is the Anti-stress Effect of Vitamin C Related to Adrenal Gland Function in Rat?
최지영,Ike Campomayor dela Peña,Seo Young YOON,Tae Sun Woo,Yoon Jung Choi,정재훈,Gu Yong Yu,신찬영,Jong Hoon RYU,이용수 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.2
The aim of this study was to investigate whether vitamin C influences the stress response system of the adrenal gland. Adrenalectomized (ADX) rats and non-ADX rats were administered vitamin C and were subjected to electroshock stress (ES) for 5 days. After loading the final stress, stress-related behaviors and corticosterone (CORT), vitamin C, and adrenocorticotropin-releasing hormone (ACTH) levels in the blood were measured. Vitamin C supplementation decreased CORT levels in non-ADX rats. Stress decreased the mean value of rearing frequency in both non-ADX and ADX rats, while vitamin C partially enhanced it only in non-ADX. Vitamin C supplementation decreased mean ACTH level in both groups. It also significantly decreased freezing time increased by stress. Lastly, vitamin C motivated both groups to cross over an electric field more frequently as compared to their respective control groups. These results suggest that the alleviating effect of vitamin C on stress-related rearing behavior was exerted via modulation of CORT, but its effect on freezing behavior may be attributed to corticotropinreleasing hormone (CRH) or ACTH.
Red Ginseng Supplementation More Effectively Alleviates Psychological than Physical Fatigue
Ji Young Choi,Tae Sun Woo,Seo Young Yoon,Ike Campomayor dela Pena,Yoon Jung Choi,Hyung Seok Ahn,Yong Soo Lee,Gu Yong Yu,Jae Hoon Cheong 고려인삼학회 2011 Journal of Ginseng Research Vol.35 No.3
Red ginseng (RG, the extract of Panax ginseng Meyer) has various biological and psychological activities and may also alleviate fatigue-related disorders. The present study was undertaken to evaluate what kind of fatigue red ginseng alleviate. Animals were orally administered with 50, 100, 200, 400 mg/kg of RG for 7 days. Before experiments were performed. Physiological stress (swimming, rotarod, and wire test) are behavioral parameters used to represent physical fatigue. Restraint stress and electric field test to a certain degree, induce psychological fatigue in animals. Plasma concentration of lactate and corticosterone (CORT) were also measured after these behavioral assays. RG supplementation (100 mg/kg) increased movement duration and rearing frequency of restrainted mice in comparison with control. 100 and 200 mg/kg of RG increased swimming time in cold water (8±4℃) while at 100 mg/kg, RG increased electric field crossing over frequencies. 50, 100 and 200 mg/kg RG prolonged running time on the rotarod and at 100 mg/kg, it increased balancing time on the wire. RG at those doses also reduced falling frequencies. RG supplementation decreased plasma CORT levels, which was increased by stress. Lactate levels were not significantly altered. These results suggest that RG supplementation can alleviate more the damages induced by psychological than physical fatigue.
Three-phase Making Test Method for Common Type Circuit Breaker
Ryu, Jung-Hyeon,Choi, Ike-Sun,Kim, Kern-Joong The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
The synthetic short-circuit making test to adequately stress the circuit breaker has been specified as the mandatory test duty in the IEC 62271-100. The purpose of this test is to give the maximum pre-arcing energy during making operation. And this requires the making operation with symmetrical short-circuit current that is established when the breakdown between contact gap occurs near the crest of the applied voltage. Also, if the interrupting chamber of circuit breakers is designed as the type of common enclosure or the operation is made by the gang operated mechanism that three-phase contacts are operated by one common mechanism, three-phase synthetic making test is basically required. Therefore, several testing laboratories have developed and proposed their own test circuits to properly evaluate the breaker performance. With these technical backgrounds, we have developed the new alternative three-phase making circuit.
Three-phase Making Test Method for Common Type Circuit Breaker
Jung-Hyeon Ryu,Ike-Sun Choi,Kern-Joong Kim 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
The synthetic short-circuit making test to adequately stress the circuit breaker has been specified as the mandatory test duty in the IEC 62271-100. The purpose of this test is to give the maximum pre-arcing energy during making operation. And this requires the making operation with symmetrical short-circuit current that is established when the breakdown between contact gap occurs near the crest of the applied voltage. Also, if the interrupting chamber of circuit breakers is designed as the type of common enclosure or the operation is made by the gang operated mechanism that threephase contacts are operated by one common mechanism, three-phase synthetic making test is basically required. Therefore, several testing laboratories have developed and proposed their own test circuits to properly evaluate the breaker performance. With these technical backgrounds, we have developed the new alternative three-phase making circuit.
소결 조건 변화에 따른 직류 피뢰기용 ZnO 바리스터의 미세구조 및 전기적 성질에 관한 연구
김석수,최익순,박태곤,조이곤,박춘현,Kim, Seok-Sou,Choi, Ike-Sun,Park, Tae-Gon,Cho, I-Gon,Park, Choon-Hyun 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.6
The microstructure and electrical characteristics of A ∼ C's ZnO varistors fabricated according to variable sintering condition, which sintering temperature was 1130 $^{\circ}C$ and speeds of pusher were A: 2 mm/min, B: 4 mm/min, C: 6 mm/min, respectively, were investigated. The experimental results obtained from this study were summarized as follows: The sintering density of A ∼C's ZnO varistors sintered at 1130 $^{\circ}C$ were decreased by sintering keep time to shorten, such as A: 9hour, B: 4.5hour and C: 3hour. A's ZnO varistor exhibited good densification nearly 98 % of theory density. In the microstructure, A∼C's ZnO varistors fabricated variable sintering condition was consisted of ZnO grain(ZnO), spinel phase(Z $n_{2.33}$S $b_{0.67}$ $O_4$), Bi-rich phasc(B $i_2$ $O_3$), wholly. Varistor voltage of A∼C's ZnO varistors sintered at 1130 $^{\circ}C$ increased in order A <B <C's ZnO varistors. C's ZnO varistor exhibited good characteristics that nonlinear exponent was 31.70. Leakage current of A ∼ C's ZnO varistors exhibited below 2 ㎃ at rated voltage. Lightning impulse residual voltage of A's ZnO varistor suited standard characteristics, which was 3.85kV at 2.5kA, 4.4 kV at 5kA and 5.16 kV at 10 kA. After continuous lightning impulse current test of A's ZnO varistor exhibited good discharge characteristics which ZnO varistor reveals no evidence of puncture, flashover, cracking in visual examination. After high current impulse test of A's ZnO varistor exhibited good discharge characteristics, which variation rate of residual voltage was 0.4 % before and after test, and revealed no evidence. evidence.