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임베디드 시스템을 위한 MPEG-4 동영상 플레이어 구현
김수한,이명원,장성태 한국정보처리학회 2007 정보처리학회논문지D Vol.14 No.4
임베디드 시스템 기술 발전으로 차세대 컴퓨터로서 웨어러블 컴퓨터가 등장하게 되었다. 아직까지 이러한 웨어러블 컴퓨터는 하드웨어와 소프트웨어 성능의 한계로 응용에 제한을 가지고 있다. 본 연구에서는 국내에서 개발한 임베디드 웨어러블 컴퓨터에서 멀티미디어 응용 서비스가 가능하도록 하는 MPEG-4 비디오 플레이어를 구현하였다. 본 논문은 ETRI에서 개발한 손목시계형 웨어러블 컴퓨터인 WPS(Wearable Personal Station) 상에서의 MPEG-4 동영상 플레이어 구현에 대해 기술한다. A wearable computer has appeared as the next generation computer with the development of embedded system technique in our country, although it has not been applicable well since the hardware and software capabilities are limited for multimedia service. We have implemented a MPEG-4 video player to provide with such multimedia application service using the embedded systems. This paper illustrates the development of MPEG-4 video player operating on the wearable computer named WPS(Wearable Personal Station), the wristwatch PC developed at ETRI.
플랭크 운동 동안에 머리와 다리 위치가 몸통근육과 위등세모근의 근활성도에 미치는 영향
김수한,박세연 대한고유수용성신경근촉진법학회 2019 PNF and Movement Vol.17 No.3
Purpose: This study investigated the muscular activity of abdominal muscles during a variety of plank exercises following changes in the leg and head positions. Methods: Thirty healthy individuals participated in this study. They performed six variations of plank exercises, including three changes in head position and two changes in leg position. Each plank was defined as head neutral-leg neutral, head up-leg neutral, head down-leg neutral, head neutral-leg wide, head up-leg wide, and head down-leg wide. During the plank excises, the muscle activities of the rectus abdominis, internal oblique, erector spinae, and upper trapezius were measured. Results: The head down position significantly increased the rectus abdominis activity compared to other head positions (p<0.05). On the other hand, the upper trapezius muscle activity was significantly higher with the head up position compared to other head positions (p<0.05). Regardless of head positions, both the rectus abdominis and internal oblique muscles were significantly activated with leg wide position compared to the leg neutral position (p<0.05). Conclusion: Head and leg positions could change the muscular activities of abdominal muscles during plank exercises. For example, the head down position is effective for activating the rectus abdominis while the leg wide position could be advantageous for enhancing the internal oblique and rectus abdominis.
김수한 한국사회학회 2013 韓國社會學 Vol.47 No.3
Researchers have studied women’s and minorities’ slow promotion into management by focusing on hiring and promotion. However, few have examined how women and minorities secure their managerial positions during corporate restructuring. Corporate bankruptcy is a widespread but understudied form of restructuring that affects employment opportunities. Using longitudinal employment data on 5,569 American workplaces over 23 years, this study finds that bankruptcy shapes racial and gender inequality. The proportion of white women in management increases when firms face bankruptcy, but it decreases when the firms overcome bankruptcy. The proportion of white men in management decreases when firms anticipate bankruptcy and experience subsequent restructuring, but the proportion increases for companies that survive bankruptcy. Representation of minorities declines before, during, and after bankruptcy restructuring. This paper concludes with implications for policy and future research.