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RISS 인기검색어
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- 저자 : ( Ah Reum Hong ) (검색결과 69 건)
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태권도 품새 옆차기시 타겟 높이 변화에 따른 운동학적 분석
Hong, Ah Reum,So, Jae Moo 한국운동역학회 2019 한국운동역학회지 Vol.29 No.3
Objective: The purpose of this study is to present the scientific and quantitative data by finding the common points and differences of the side-kick according to the height change through the difference of the side kick motion performance according to the three target height changes and the function of the lower limbs muscle in side kick motion of Taekwondo Poomsae. Method: For this, total 14 players were selected who were registered in Korea Taekwondo Association and skilled group 7 players who had a medal from national competition and 7 players who did not have Taekwondo experience from department of physics. 4 video cameras to the feature on side kick per target height, and the subjects' support foot was located on the ground reactor and the practice was conducted 3 times: waist, chest, and head as the target height. the basic materials were collected by using Kwon 3D XP program and the T-test was conducted to verify the statistic difference between groups (SPSS 24.0). At this time, the statistics significance level was set as .05 and the following conclusion was obtained. Results: The lower the proficiency and the higher the height, the more the joint coordination between the hip and the knee. Conclusion: Summary of the result shows a common point that the change of target's height makes the lower the proficiency and the higher the height, the more the joint coordination between the hip and the knee. Also, the higher the target's height became, the greater angular momentum of thighs, shanks, foot became in common.
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태권도 품새 옆차기시 타겟 높이 변화에 따른 운동학적 분석
( Ah Reum Hong ),( Jae Moo So ) 한국운동역학회 2019 한국운동역학회지 Vol.29 No.3
Objective: The purpose of this study is to present the scientific and quantitative data by finding the common points and differences of the side-kick according to the height change through the difference of the side kick motion performance according to the three target height changes and the function of the lower limbs muscle in side kick motion of Taekwondo Poomsae. Method: For this, total 14 players were selected who were registered in Korea Taekwondo Association and skilled group 7 players who had a medal from national competition and 7 players who did not have Taekwondo experience from department of physics. 4 video cameras to the feature on side kick per target height, and the subjects' support foot was located on the ground reactor and the practice was conducted 3 times: waist, chest, and head as the target height. the basic materials were collected by using Kwon 3D XP program and the T-test was conducted to verify the statistic difference between groups (SPSS 24.0). At this time, the statistics significance level was set as .05 and the following conclusion was obtained. Results: The lower the proficiency and the higher the height, the more the joint coordination between the hip and the knee. Conclusion: Summary of the result shows a common point that the change of target's height makes the lower the proficiency and the higher the height, the more the joint coordination between the hip and the knee. Also, the higher the target's height became, the greater angular momentum of thighs, shanks, foot became in common.
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가상환경 변화에 따른 덤벨 컬 운동효과에 관한 운동역학적 검증
( Ah Reum Hong ),( Jai Jung Kim ),( Jae Moo So ) 한국운동역학회 2020 한국운동역학회지 Vol.30 No.1
Objective: The purpose of this study is to apply exercise learning effect to various subjects through training effect and information accumulation based on verification of the effect on dumbbell curl exercises applied with virtual reality. Method: To analyze the effect on the dumbbell curl exercise in the virtual environment, a total of 20 persons with 10 males and 10 females who does not have orthopedics diseases were selected. The dumbbell weight of the subjects was set to a weight of 70% strength of 1RM. At this time, the virtual environment situation was set to four types; presence/absence of virtual environment, preferred colors, and unfavorable colors to perform dumbbell curl exercise. The anaysis of muscle activity was conducted by adhering four surface electrodes (Biceps Brachii, Triceps Brachii, Brachioradialis Muscle, Extensor Carpi Radialis Longus Muscle) on the right upper limbs. Independent sample t-test using SPSS (24.0) program was carried out to analyze average values and standard deviations for each variable depending on the presence/absence of virtual environments and changes in color (preferred colors, unfavorable colors) and the level of significancewas set to a=.05. Results: In the eccentric contraction, males showed high muscle activity in the Biceps Brachii under virtual reality. On the other hand, females had high muscle activity in the Biceps Brachii in the absence of virtual reality. Also, in case of a change of colors in the virtual environment, females had the high muscle activity in the unfavorable color in the eccentric contraction. Conclusion: During the dumbbell curl exercise, results of different exercises present depending on gender. When males put VR on and performs a basic dumbbell curl exercise, the effect of Biceps presents Brachii for them while exercising in unfavorable colors. However, since it is the basic research data of muscle exercise using virtual reality, it is necessary to verify whether or not it is effective for myopachynsis through long-term training rather than unity.
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가상환경 변화에 따른 덤벨 컬 운동효과에 관한 운동역학적 검증
Hong, Ah Reum,Kim, Jai Jung,So, Jae Moo 한국운동역학회 2020 한국운동역학회지 Vol.30 No.1
Objective: The purpose of this study is to apply exercise learning effect to various subjects through training effect and information accumulation based on verification of the effect on dumbbell curl exercises applied with virtual reality. Method: To analyze the effect on the dumbbell curl exercise in the virtual environment, a total of 20 persons with 10 males and 10 females who does not have orthopedics diseases were selected. The dumbbell weight of the subjects was set to a weight of 70% strength of 1RM. At this time, the virtual environment situation was set to four types; presence/absence of virtual environment, preferred colors, and unfavorable colors to perform dumbbell curl exercise. The anaysis of muscle activity was conducted by adhering four surface electrodes (Biceps Brachii, Triceps Brachii, Brachioradialis Muscle, Extensor Carpi Radialis Longus Muscle) on the right upper limbs. Independent sample t-test using SPSS (24.0) program was carried out to analyze average values and standard deviations for each variable depending on the presence/absence of virtual environments and changes in color (preferred colors, unfavorable colors) and the level of significance was set to a=.05. Results: In the eccentric contraction, males showed high muscle activity in the Biceps Brachii under virtual reality. On the other hand, females had high muscle activity in the Biceps Brachii in the absence of virtual reality. Also, in case of a change of colors in the virtual environment, females had the high muscle activity in the unfavorable color in the eccentric contraction. Conclusion: During the dumbbell curl exercise, results of different exercises present depending on gender. When males put VR on and performs a basic dumbbell curl exercise, the effect of Biceps presents Brachii for them while exercising in unfavorable colors. However, since it is the basic research data of muscle exercise using virtual reality, it is necessary to verify whether or not it is effective for myopachynsis through long-term training rather than unity.
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Imidazole Trimer-Water Complexes in Superfluid Helium Nanodroplets: Water Stretching Modes
Ahn, Ah-Reum,Lee, Seung-Jun,Lee, Seul-Ki,Min, Ah-Reum,Kim, Yu-Sic,Jung, Hyeon-Jin,Hong, Seong-Min,Lee, Joon-Hwa,Choi, Myong-Yong,Miller, Roger E. Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
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Resources Recovery of High-capacity Lithium Ion Battery for Electric Vehicles
( Hong-in Kim ),( Jeong- Soo Sohn ),( Dong-hyo Yang ),( Soo-kyung Kim ),( Suk-hyun Byun ),( Ah-reum Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
The global electric vehicle market is expected to increase to 10.83 million units in 2020, and the need to recycle lithium secondary batteries for electric vehicles is increasing. As a result, lithium, cobalt, and nickel, which are key materials for electric vehicles, autonomous vehicles and large- And it is necessary to secure stable resources. Therefore, studies on useful resource recovery from large capacity lithium ion batteries are being conducted in Europe and China. Lithium Ion batteries for electric vehicles are equivalent to 4 ~ 5,000 batteries for mobile phones, so it is important to pay attention to fire and explosion when recycling. In order to secure leadership for global rechargeable lithium battery recycling in Europe and China, an efficient pre- . Unlike the portable rechargeable lithium secondary battery recycling process that is currently being commercialized, a largecapacity rechargeable battery for an electric vehicle requires much time and processing cost for discharging, disassembling, sorting, etc., And the like are difficult to recycle due to low economic efficiency. There is no world-wide research to develop discharge, disassembly and separation processes for such large-capacity lithium-ion batteries for electric vehicles. In the development of processes that economically recycle not only cells but also other cells after stable discharge, disassembly and separation, . In this study, pre - treatment process such as discharging, disassembling, and fracturing separation was carried out in order to recover useful resources from automotive lithium Ion batteries.
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( Ah Reum Park ),( Joo Hee Hong ),( Jae Jin Kim ),( Jeong Jun Yoon ) 한국균학회 2012 Mycobiology Vol.40 No.3
A β-glucosidase from Penicillium italicum was purified with a specific activity of 61.8 U/mg, using a chromatography system. The native form of the enzyme was an 88.5-kDa tetramer with a molecular mass of 354 kDa. Optimum activity was observed at pH 4.5 and 60oC, and the half-lives were 1,737, 330, 34, and 1 hr at 50, 55, 60, and 65oC, respectively. Its activity was inhibited by 47% by 5 mM Ni2+. The enzyme exhibited hydrolytic activity for p-nitrophenyl-β-D-glucopyranoside (pNP-Glu), p-nitrophenyl-β-D-cellobioside, p-nitrophenyl-β-D-xyloside, and cellobiose, however, no activity was observed for p-nitrophenyl- β-D-lactopyranoside, p-nitrophenyl-β-D-galactopyranoside, carboxymetyl cellulose, xylan, and cellulose, indicating that the enzyme was a β-glucosidase. The kcat/Km (s-1 mM-1) values for pNP-Glu and cellobiose were 15,770.4 mM and 6,361.4 mM, respectively. These values were the highest reported for β-glucosidases. Non-competitive inhibition of the enzyme by both glucose (Ki = 8.9 mM) and glucono-δ-lactone (Ki = 11.3 mM) was observed when pNP-Glu was used as the substrate. This is the first report of non-competitive inhibition of β-glucosidase by glucose and glucono-δ-lactone.
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Salicylic Acid-Based Organic Dyes Acting as the Photosensitizer for Solar Cells
Hong, Sungjun,Park, Jae-Hyeong,Han, Ah-Reum,Ko, Kwan-Woo,Eom, Jin Hee,Namgoong, Sung Keon,Lo, Alvie S. V.,Gordon, Keith C.,Yoon, Sungho,Han, Chi-Hwan American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>A D-pi-A metal-free organic dye, featuring salicylic acid as a novel acceptor/anchoring unit, has been designed, synthesized and applied to dye-sensitized solar cell. The detailed photophysical, electrochemical, photovoltaic and sensitizing properties of the organic dye were investigated, in addition to the computational studies of the dye and dye-(TiO2)(6) system. A solar cell device using this new organic dye as a sensitizer produced a solar to electric power conversion efficiency (PCE) of 3.49% (J(SC) = 6.69 mAcm(-2), V-OC 0.74 V and ff = 0.70) under 100 mWcm(-2) simulated AM 1.5 G solar irradiation, demonstrating that the salicylic acid-based organic dye is a suitable alternative to currently used organometallic dyes.</P>
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