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Jeong Kangeun,Kim Bongsoo,Lee Sung Jong 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.9
We present a simulation study that extends our recent work [Phys. Rev. E 99, 022113 (2019)] on the two-dimensional kinetic Ising model under a slow linear cooling. This study aims to systematically investigate how nonlinearity of temperature cooling afects the nonequilibrium kinetics of excess defect density and associated phase ordering. New interesting kinetic features are observed due to the nonlinear manner of coolings. We observe that, as the nonlinearity increases, there appear two peaks in the time dependence of the excess defect density where dynamic scaling with the Kibble–Zurek time and length scales is satisfed up to the critical temperature region. The defect density at the onset of zero temperature exhibits a nondifusive coarsening behavior, which is at variance with the previous predictions of others. We fnd that via the Kibble–Zurek mechanism, one can engineer the nonequilibrium critical dynamics of the spin confgurations in the two-dimensional Ising model, such that a prescribed value of the critical dynamic exponent can be obtained by tuning the nonlinearity of slow cooling
Kim Heejeong,Jeong Kangeun,Kim Bongsoo,Lee Sung Jong 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.8
We numerically investigate the nonequilibrium dynamics of the kinetic Ising chain under slow cooling to zero temperature, employing a spin-exchange kinetics that conserves the order parameter. We focus on a logarithmic cooling protocol with a tuning parameter. Applying the Kibble–Zurek mechanism to the considered cooling protocol, we derive the common expressions for the growing length and timescales with cooling, which holds for both the spin-fip and spin-exchange kinetics. The dynamic scaling behaviors of the excess defect density and spin correlation function indicate that the nonequilibrium dynamics is governed by the time and length scales that are in agreement with the predictions of the Kibble–Zurek mechanism. We fnd that the equal-time spatial spin correlation function at zero temperature exhibits a universal power law decay at long distance. At variance with an interesting possibility recently raised for the present system, no new length scale is found that is distinct from the Kibble–Zurek one. The measured correlation length exhibits an extraordinarily rapid growth process during the cooling down to zero temperature after the onset of nonequilibrium regime.
G.723.1 기반 비트율 scalable 음성 코덱 개발
강상원,이강은,박동원,이준석,Kang Sangwon,Lee Kangeun,Park Dongwon,Lee Joonseok 한국음향학회 2005 韓國音響學會誌 Vol.24 No.6
본 논문에서는 ITU-T 표준으로 채택된 G.723.1을 기본 계층으로 하고 G.723.1의 합성 에러 신호를 추가적인 부호화 과정을 통하여 부호화하는 비트율 scalable 코덱을 제안하였다. 그리고 제안된 scalable 음성 코덱을 ITU-T 표준 음질 측정 소프트웨어인 P.862 (PESQ)를 이용하여 성능 분석을 하였다. 제안된 비트율 scalable 코덱을 적용함으로써 G.723.1 5.3kbps와 개선 계층 6.7kbps가 함께 동작할 경우 G.723.1 5.3kbps 보다 MOS값이 0.372 향상되었으며, G.723.1 6.3kbps와 개선 계층 5.7kbps가 함께 동작할 경우 G.723.1 6.3kbps 보다 0.267 향상되었다. In this Paper. we present a bitrate scalable speech codec which uses an ITU-T G.723.1 as the baseline coder and encodes the synthesis error signal in an enhancement coder. ITU-T P.862 (PESQ) is used to evaluate the Performance of the bitrate scalable coder. Experiments show that 6.7kbps enhancement layer based on G.723.1 5.3kbps produces the increase of 0.39 in MOS and 5.7kbps enhancement layer based on G.723.1 6.3kbps Produces the increase of 0.267 in MOS.
Roh, Hee-Tae,Ha, Hyoung Zoo,Woo, Jin-Hee,Lee, Yul-Hyo,Ko, Kangeun,Bae, Ju-Yong The Korean Society of Applied Science and Technolo 2018 한국응용과학기술학회지 Vol.35 No.3
We investigated the effect of different exercise intensities on biomarkers of oxidant-antioxidant balance, inflammation, and muscle damage. Eighteen healthy and untrained male subjects were enrolled.Subjects were randomly and equally assigned to a moderate-intensityexercise(MIE, $65%VO_2max$) group(n=9) or a high-intensity exercise(HIE, $85%VO_2max$) group(n=9).Blood samples were collectedimmediately pre-exercise, post-exercise, and 60min post-exercisetoexamine oxidant-antioxidant balance(d-ROMs; BAP), inflammation(CRP; fibrinogen), muscle damage(CK; LDH), and lactate. Serum d-ROMs and BAP levels were significantly increased post-exercise compared with pre-exercise levels in HIE group(p<0.05). Lactate levels were significantly increased post-exercise compared pre-exercise levels in both the MIE and HIE groups(p<0.05). In addition, post-exercise serum d-ROMs and plasma lactate levels were significantly higher in the HIE group than in the MIE group(p<0.05). These results suggest that although relatively high-intensity exercises may increase oxidative stress levels in the body, they do not produce inflammatory response and/or muscle damage.
Hee-Tae. Roh,Hyoung Zoo,Ha․,Jin-Hee,Woo․,Yul-Hyo,Lee Kangeun,Ko․,Ju-Yong. Bae 한국유화학회 2018 한국응용과학기술학회지 Vol.35 No.3
We investigated the effect of different exercise intensities on biomarkers of oxidant-antioxidant balance, inflammation, and muscle damage. Eighteen healthy and untrained male subjects were enrolled.Subjects were randomly and equally assigned to a moderate-intensityexercise(MIE, 65%VO 2 max) group(n=9) or a high-intensity exercise(HIE, 85%VO 2 max) group(n=9).Blood samples were collectedimmediately pre-exercise, post-exercise, and 60min post-exercisetoexamine oxidant-antioxidant balance(d-ROMs; BAP), inflammation(CRP; fibrinogen), muscle damage(CK; LDH), and lactate. Serum d-ROMs and BAP levels were significantly increased post-exercise compared with pre-exercise levels in HIE group(p<0.05). Lactate levels were significantly increased post-exercise compared pre-exercise levels in both the MIE and HIE groups(p<0.05). In addition, post-exercise serum d-ROMs and plasma lactate levels were significantly higher in the HIE group than in the MIE group(p<0.05). These results suggest that although relatively high-intensity exercises may increase oxidative stress levels in the body, they do not produce inflammatory response and/or muscle damage.