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Balancing MPEG Transcoding with Storage in Multiple-Quality Video-on-Demand Services
송민석,심정섭,Jaedoo Go,Bumsun Lee,박수준 한국전자통신연구원 2009 ETRI Journal Vol.31 No.3
To match the requirements of heterogeneous mobile devices, video objects may be transcoded, which requires considerable CPU resources. Alternatively, multiple versions of the same video may be stored on servers, but this requires a lot of disk space. We formulate the trade-off between the versions that are stored on disk and the need for transcoding. We propose an optimal solution to this formulation based on dynamic programming. Experiments show that our scheme allows up to 68% more clients to be admitted than conventional schemes when a reasonable amount of storage is available.
Endoscope-Assisted Hairline Approach for Head and Neck Masses: A Review
송민석,우승훈 대한이비인후과학회 2023 Clinical and Experimental Otorhinolaryngology Vol.16 No.4
Conventional surgery through a transcervical incision is indicated for the treatment of certain tumors in the head and neck. However, this method can cause multiple problems, including scarring and cosmetic concerns. The endoscope-assisted hair-line approach, which serves as an alternative to conventional surgical procedures, is gaining popularity due to its excellentcosmetic and functional outcomes. However, given the anatomical complexity involved, the endoscope-assisted hairlinetechnique is not frequently employed in head and neck surgery. The evolution of the hairline surgical approach has beeninfluenced by changes in disease conditions and recent advances in surgical tools. This review article discusses the use ofendoscope-assisted hairline approaches in the resection of head and neck masses, focusing on the surgical procedure andpostoperative clinical outcomes.
송민석 한국융합학회 2015 한국융합학회논문지 Vol.6 No.5
사회복지시설은 지역주민의 복지욕구에 적합한 서비스의 자원개발과 전달체계를 국가로부터 위임받아 국 민에게 전문적인 사회복지서비스 제공을 위해 시설의 합리적이고 효율적인 시설운영과 효과적인 서비스전달 등에 대한 사회적 책임의식을 가진다. 지금까지 사회복지사업법 규정에 의한 제5차에 걸친 평가는 사회복지시설 운영의 효율성과 책임성을 제고하는 동시에 합리적이고 체계적인 운영방향을 제시하여 사회복지시설의 균형적 발전과 선진 화를 위한 중요한 토대를 마련하였다. 그러나 사회복지시설 평가의 문제점에 대해서도 지속적으로 제기되어 온 것도 사실이다. 따라서 본 연구에서는 사회복지시설에 대한 사회적 요구에 부응할 수 있는 평가체계가 갖추어야 할 기준 과 개선방안을 도출함으로써 시설이용자들의 복지를 통한 삶의 질을 향상시킬 수 있는 융합모형을 제시하고자 한다. The social welfare facilities are trusted by the government for the development of appropriate welfare services and their delivery systems. They aim to provide people with professional social welfare services and, for this purpose, they develop ways to effectively operate facilities and to deliver the services efficiently. So far, the five consecutive evaluations based on the Social Services Act have suggested the effective and systematic ways of operating social welfare facilities. Through these efforts, they established an important basis for the balanced development and further advancement of social welfare facilities. Nevertheless, people have continually pointed out problems concerning the evaluation system of social welfare facilities. Accordingly, these problems have the necessity of investigation for reformed directions by means of effective control and evaluation system for the operation of social welfare facilities. Therefore, this study aims to suggest convergence models for improving the social welfare facilities evaluation system.
송민석,임재성,이민우 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.8
As the number of signal sources with low detectability by using various modulation techniques increases, research to classify signal modulation methods is steadily progressing. Recently, a Convolutional Neural Network (CNN) deep learning technique using FFT as a preprocessing process has been proposed to improve the performance of received signal classification in signal interference or noise environments. However, due to the characteristics of the FFT in which the window is fixed, it is not possible to accurately classify the change over time of the detection signal. Therefore, in this paper, we propose a CNN model that has high resolution in the time domain and frequency domain and uses wavelet transform as a preprocessing process that can express various types of signals simultaneously in time and frequency domains. It has been demonstrated that the proposed wavelet transform method through simulation shows superior performance regardless of the SNR change in terms of accuracy and learning speed compared to the FFT transform method, and shows a greater difference, especially when the SNR is low. 다양한 변조 기법을 사용하여 저피탐 능력을 갖춘 신호원들이 증가하면서, 신호의 변조 방식을 분류하는 연구가 꾸준히 진행되고 있다. 최근 신호 간섭이나 잡음 환경에서 수신 신호 분류의 성능 개선을 위하여 전처리 과정으로 FFT를 이용하는 CNN(Convolutional Neural Network) 딥러닝 기법이 제안되었다. 하지만 윈도우가 고정되는 FFT의 특성상 탐지 신호의 시간에 따른 변화를 정확히 분류해내지 못한다. 따라서 본 논문에서는 시간 영역과 주파수 영역에서 높은 해상도를 가지고 또한 다양한 유형의 신호를 시간 및 주파수 영역에서 동시에 표현할 수 있는 웨이블릿 변환(wavelet transform)을 전처리 과정으로 사용하는 CNN 모델을 제안한다. 시뮬레이션을 통해 제안하는 웨이블릿 변환 방식이 FFT 변환 방식에 비해 정확도와 학습 속도 측면에서 SNR 변화에 무관하게 우수한 성능을 보이고, 특히 낮은 SNR일 때 더욱 큰 차이를 보임을 입증하였다.