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( Sangbae Jun ),( Han J. Lee ),( Kyunghwa Lee ),( Narae Son ),( Juhyun Kwak ) 한국체육학회 2016 국제스포츠과학 학술대회 Vol.2016 No.1
Purpose: Coaches are presented with the opportunity to interact with their athletes as well as other coaches, which makes their social networks. Previous work (Burt, 1992) has found links between network positions and individual performance. We tested Burt’s (1992) theory using a Korean Olympic Soccer team. Coaches and their athletes are situated in the unique network where coaches are tied to athletes’ performance. There has been limited research examining the nature of these social networks with athletes and other coaches (Trudel and Gilbert 2004). Thus, the purpose of this study was to examine associations between the social networks and performance outcomes of Korea national soccer team coaches. Method: The study surveyed coaches’ social networks of Korea Olympic soccer team in the periods from 1992 to 2012. Their performance in the international games (e.g., the World Cups, the Olympics, Asian games, Asian Cups, FIFA-U20, and FIFA-U17) was measured using winning rate of career records. The data was analyzed with UCINET6 and NetDraw, and descriptive statistics for analyzing the relationships. Result: Findings of the study indicated Hong Myung-Bo and Huh Jung-Moo had the biggest and various social networks, and the highest scores in centrality measures. Homophily was found that most of head coaches and assistant coaches were graduates of Yonsei or Korea university. Findings did not show statistically significant relationship between coaches’ social network and their performance outcome. Conclusion: Evolution of coaches’ social networks and homophily had been discovered in a vast array of network studies were discussed.
Novel microfluidic platform for modeling and evaluating osteoconduction of 3D printed scaffold
( Jinsub Han ),( Sangbae Park ),( Jae Eun Kim ),( Jae Woon Lim ),( Hyunmok Son ),( Kyoung-je Jang ),( Jong Hoon Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.1
Using scaffold in bone regenerative treatment for efficient osteoconduction to induce the bone healing is still challenging. Thus, the aim of the study was to develop scaffold-on-a-chip device that comprises a 3D environment and fluid shear stress. The chip is composed with space for scaffold in the center and a microfluidic channel which encircles the scaffold area. This structure can allow real time monitoring of cell adhesion, proliferation, differentiation and migration. The design of chip model focused on minimizing bubble and controlling of cell seeding area, both verified using computational fluid dynamics (CFD). Different channel coatings were compared to enhance cell adhesion on the chip and coating with 200 μg/ml of fibronectin was applied on the chip. MC3T3-E1 cells were cultured in the chip device for 7 days and investigated using immunocytochemical staining. Results demontrated that the cells were successfully cultured and differentiated in the chip. Fabricated scaffold-on-a-chip has a potential to help our understanding of scaffold-tissue interaction and provide an alternative to animal and clinical studies for scaffold development.
Band-width Expansion Method Using Spline Codebook-based Spectral Folding
Jihoon Park,Seungho Han,Heesik Yang,Sangbae Jeong,Minsoo Hahn 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper proposes a band-width expansion method using the spline codebook based spectral folding. The spline codebook consists of the clustered cepstrum and the corresponding splines. The experimental results of the PESQ , the MOS, and preference tests show that the proposed method is superior to the ABE one.
Adaptive microphone array processing for high-performance speech recognition in car environment
Jungpyo Hong,Seungho Han,Sangbae Jeong,Minsoo Hahn IEEE 2011 IEEE transactions on consumer electronics Vol.57 No.1
<P>In this paper, a novel speech enhancement algorithm is proposed. The algorithm controls the amount of noise reduction according to whether the target speech is absence or presence in noisy environments. Based on the estimated speech absence probability (SAP), the amount of noise reduction is adaptively controlled. To calculate the SAP, normalized cross correlation of linear predictive residual signals instead of that of original input signals is utilized. It is especially robust and effective in reverberant and realistic environments. Experimental results show that the proposed algorithm improves speech recognition rates compared with conventional beamforming algorithms in car environments.</P>