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Multiple-Class Dynamic Threshold algorithm for Multimedia Traffic
김상윤,이성창,함진호,Kim, Sang-Yun,Lee, Sung-Chang,Ham, Jin-Ho The Institute of Electronics and Information Engin 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.12
현재 사용되고 있는 Internet상의 트래픽은 어플리케이션의 종류에 따라 다양한 수준의 QoS 요구조건, 즉, Delay, Loss 그리고 Throughput성능에 대한 요구조건을 오청하고 있다. TCP protocol을 사용하는 ETP서비스나 E-Mail 등의 서비스는 Delay나 Loss 성능보다는 Throughput성능에 대한 요구가 높은 편이기 때문에 앞의 두 성능악화의 반대급부로서 Throughput성능을 보장받곤 한다. 반면에, 대부분 UDP protocol을 사용하는 real-time streaming 어플리케이션, 예를 들면, IP telephony, Video conferencing, 혹은 network games등의 어플리케이션은 여타의 것들에 비하여 Throughput 보다는 delay나 loss에 대한 성능을 상대적으로 높게 요구한다. 하지만 현재의 AQM들은 best-effort 서비스에 초점을 맞추고 있다. 즉, throughput 성능을 위하여 delay나 loss성능을 희생하고 있기 때문에 다양한 어플리케이션에 적합한 서비스를 제공하기 힘들다. 따라서 본 논문에서는 각 어플리케이션이 필요로 하는 QoS 성능을 고려하여 어플리케이션들을 세 가지 클래스로 분류한 뒤 적합한 QoS 요구조건을 고려한 새로운 AQM 알고리즘을 제안한 뒤, 시뮬레이션을 통하여 다른 AQM 알고리즘과 비교 분석하고 그에 대한 결론을 도출한다. Traditional Internet applications such as FIP and E-mail are increasingly sharing bandwidth with newer, more demanding applications such as Web browsing, IP telephony, video conference and online games. These new applications require Quality of Service (QoS), in terms of delay, loss and throughput that are different from QoS requirements of traditional applications. Unfortunately, current Active Queue Management (AQM) approaches offer monolithic best-effort service to all Internet applications regardless of the current QoS requirements. This paper proposes and evaluates a new AQM technique, called MCDT that provides dynamic and separated buffer threshold for each Applications, those are FTP and e-mail on TCP traffic, streaming services on tagged UDP traffic, and the other services on untagged UDP traffic. Using a new QoS metric, our simulations demonstrate that MCDT yields higher QoS in terms of the delay variation and a packet loss than RED when there are heavy UDP traffics that include streaming applications and data applications. MCDT fits the current best-effort Internet environment without high complexity.
MetaWeblog API를 이용한 원격 블로그 포스팅 도구
김상윤 ( Sang-yun Kim ),김은민 ( Eun-min Kim ),이청훈 ( Chung-hoon Lee ),이상호 ( Sang-ho Lee ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2
빅데이터 정보화 시대에 들어 많은 정보들이 개인 블로그에 포스팅 되고 있다. 하지만 각각의 블로그들은 다른 UI, API를 제공하고 편집에 있어 불편한 부분이 많다. 따라서 공통된 하나의 도구를 이용해 추가, 편집 할 수 있는 프로그램을 제작해 작성자의 편리함을 도모하고자 한다.
Temperature Sensor 기반 ±1 % 이내의 주파수 정확도를 가지는 18 MHz Relaxation Oscillator의 설계
김상윤(Sang Yun Kim),이주리(Ju ri Lee),이동수(Dong Soo Lee),박형구(Hyung Gu Park),김홍진(Hong Jin Kim),이강윤(Kang-Yoon Lee) 한국산업정보학회 2013 한국산업정보학회논문지 Vol.18 No.5
본 논문에서는 BGR과 ADC를 사용하여 Temperature Compensation 기능을 가진 Relaxation Oscillator를 제안한다. Relaxation Oscillator는 전류조절을 통해 주파수를 결정한다. 제안하는 Relaxation Oscillator는 온도에 따른 출력 주파수를 보상하기 위하여 온도에 따른 ADC 및 BGR의 출력 코드를 사용하여 전류를 조절한다. 제안하는 Relaxation Oscillator는 CMOS 0.35 μm 공정으로 설계되었으며, 면적은 240 μm x 210 μm 이다. 전류 소모는 공급전압인 5 V에서 600 μA이며, 온도에 대한 출력 주파수는 ±1 %이내의 정확도를 가진다. In this paper, a Relaxation Oscillator with temperature compensation using BGR and ADC is presented. The current to determine the frequency of Relaxation Oscillator can be controlled. By adjusting the current according to the temperature using the code that is output from the ADC and BGR, was to compensate the output frequency of the temperature. It is fabricated in a 0.35 μm CMOS process with an active area of 240 μm x 210 μm. Current consumption is 600 μA from a 5 V and the rate of change of the output frequency with temperature shows about ±1 %.
김상윤(Sang-Yun Kim),이용호(Yong-Ho Lee),황정하(Jung-Ha Hwang) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Old cases of wind power generation focused on enlargement mainly in the windy coastal or mountainous areas, but recent years have witnessed a gradual increase of small wind power generation systems applicable to downtown buildings thanks to the technological development and advancement. The purposes of this study were to propose a model for small wind power generation system, analyze the air flow characteristics of each alternative, and review their applicability. The optimal conditions include the turbine configuration of wind power generator at opposite or right angles on the rooftop of a Y-shaped building, the installation location of parapet within maximum 0.5m, and the height of parapet within 0.15~0.3m under the consideration of separation distance from the rooftop banister and air flows according to turbine configuration and guide vanes.
복싱클럽 서비스품질에 따른 이용만족이 운동지속 및 추천의도에 미치는 구조적 관계
김상윤(Kim, Sang-Yun),조광민(Cho, Kwang-Min),배정섭(Bae Jung-Sup) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.1
The purpose of this research is to investigate the effect of customer satisfaction regarding boxing club service quality on exercise maintenance and recommendation intention. We have chosen a sample of adult male and female users of boxing clubs. We distributed 410 surveys to users of 20 boxing clubs in Seoul and Gyeonggi-do from July 10th to August 13th, 2018. From these, we eliminated nine responses that we deemed inadequate and analyzed the rest of the 401 responses. Using SPSS 24.0 and AMOS 23.0, we put the results through frequency analysis, reliability analysis, confirmatory factor analysis, correlation analysis, and structural equation linear model analysis. The results are as follows. First, boxing club service quality has a positive effect on customer satisfaction. Second, boxing club service quality has a positive effect on exercise maintenance. Third, boxing club service quality has a negative effect on recommendation intention. Fourth, customer satisfaction has a positive effect on exercise maintenance. Fifth, customer satisfaction has a positive effect on recommendation intention. Sixth, exercise maintenance has a positive effect on recommendation intention.
시간 영역에서의 제한된 절점력을 이용한 구조물의 손상검출
김상윤 ( Kim Sang Yun ),유석형 ( Yoo Sukhyeong ),신성우 ( Shin Sung Woo ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
Numerous non-destructive tests(NDT) to assess the safety of real structures have been developed. System identification(SI) techniques using dynamic responses and behaviors of structural systems become an outstanding issue of researchers. However the conventional SI techniques are identified to be non-practical to the complex and tall buildings, due to limitation of the availability of an accurate data that is magnitude or location of external loads. Thus a technique to estimate structural properties of building without input measurement data and using limited response is essential in structural health monitoring. In this study, shaking table tests on three-story plane frame steel structures were performed. Out-put only model analysis on the measured data was performed, and the dynamic properties were inverse analyzed using least square method in time domain. In results damage detection was performed in each member level, which was performed at story level in conventional SI techniques of frequency domain.
국가대표 복싱선수들의 리우올림픽출전 실패원인에 대한 내러티브 탐구
김상윤(Kim, Sang-Yun),조광민(Cho, Kwang-Min),장원용(Jang, Won-Yong) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.6
The stories from the two coaches of the National Boxing Teams who have experiences planning and coaching the 2016 National Boxer selection process as well as observing their participation in the first half of first half of the Asian Qualification Tournament in order to secure the Rio Olympic tickets were selected as narratives to be analyzed as a part of a qualitative research method in which in depth 1:1 interviews are conducted five to six times and the corresponding recordings are presented and reconstructed to fit the research topic. A former national boxer participated in the study and drew findings based on the research journals and self-narrative analysis. First, there were limitations in improving the performance in matches with limited domestic athletes and insufficient off-season training and little experience. Second, a lack of experts who can resolve diplomatic conflicts at the Asian competition sites resulted in receiving an unfair verdict from AIBA(Amateur International Boxing Association) judges. Third, with insufficient budget support from the national boxing team to participate in the Rio Olympics, the team lacked opportunities to gain hands-on experience with foreign players through overseas training.