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.

제품조형의 은유적 표현에 관한 사례연구 -유희적 표현과 관능적 표현의 사례를 중심으로-

김상윤 ( Sang Yun Kim ),나동훈 ( Dong Hoon Na ),변상태 ( Sang Tae Byun ) 한국기초조형학회 2008 기초조형학연구 Vol.9 No.5

2017국가대표 복싱선수 선발과정 오류에 관한 내러티브 탐구

김상윤(Kim, Sang-Yun),조광민(Cho, Kwang-Min) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.6

The purpose of this study is to analyze the selection process of formal boxing players in Korea and find ways to improve the national competitiveness by selecting experienced boxing athletes with high experience and skills in international competitions. In order to accomplish the purpose of this study, participants were chosen from the successful 2016 National Sports Festival unemployment team. Among this team, 3 men and women who did not participate in the 2017 National Boxing Tournament, one elite boxing association executive, one National Boxing team leader, and three unemployment team leaders were chosen as research participants. The results were as follows: First, the 2017 national boxing match is a formal game in which most high-match unemployed players are absent. Second, the 2017 national boxing squad selection process was conducted without considering domestic characteristics and only focusing according to the AIBA rules. Third, the lack of financial rewards and rigorous lifestyle at the Korean National Training Center went against the mindset of the unemployed team members who would rather avoid hard exercise in favor of personal comfort.

비가수분해 솔-젤법으로 제조한 V₂O₅-TiO₂ 촉매를 이용한 황화수소의 선택 산화반응

김상윤(Sang-Yun Kim),조달래(Dal-Rae Cho),박대원(Dae-Won Park) 한국청정기술학회 2008 청정기술 Vol.14 No.3

비가수분해 솔-젤법에 의하여 여러 가지 조성의 V₂O?-TiO₂ 촉매를 합성하여 특성분석을 실시하고 황화수소의 선택 산화반응에 대한 촉매성능을 고찰하였다. 이 V₂O?-TiO₂ 촉매는 높은 표면적을 가지고 VOx가 작은 입자로 잘 분산되어 있었고, 환원성도 우수한 것으로 나타났다. 그러나 12 wt% 이상의 바나디아 담지량부터는 결정성 V₂O?가 관찰되어 H₂S의 전환율을 감소시키는 결과를 초래하였다. 이 방법으로 제조된 V₂O?-TiO₂ 촉매는 통상의 제로젤(xerogel) 촉매나 함침 촉매에 비해 높은 반응활성을 보여 주었고, 암모니아와 물이 포함된 조건에서도 황화수소를 선택산화시켜 이산화황을 거의 발생시키지 않고 환경친화적이고 안전한 물질인 원소 황(sulfur)과 티오황산암모늄(ATS)으로 회수할 수 있었다. A series of V₂O?-TiO₂ xerogel catalysts were prepared by nonhydrolytic sol-gel method and analysed by various characterization techniques. These catalysts showed much higher surface areas and total pore volumes than conventional V₂O?-TiO₂ xerogel and impregnated V₂O?/TiO₂ catalysts. It was found that the textural property of V₂O?-TiO₂ material varies with the method and conditions of synthesis. Surface vanadates and TiO₂ anatase phase are the crucial factors to obtain high catalytic activities. The selective oxidation of hydrogen sulfide in the presence of excess water and ammonia was studied over these catalysts. Xerogel catalysts prepared by non-hydrolytic sol-gel method showed very high conversion of H2S without harmful emission of SO2₂. The highest catalytic activity shown by these V₂O?-TiO₂ catalysts may be due to their high surface area and good dispersion of vanadia species in the titania matrix.

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.

복싱클럽 서비스스케이프가 고객반응, 고객신뢰, 고객만족에 미치는 구조적 관계

김상윤(Kim, Sang-Yun) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.3

The purpose of this study is to establish the structural relationship between the boxing club’s servicescape to customer response, customer trust, and customer satisfaction. 300 customers from six boxing clubs located in Seoul and Gyeonggi-do were selected. Two of these were excluded in the report, as they were judged to be insincere. Data processing was conducted with SPSS 25.0 and AMOS 23.0 for frequency analysis, reliability analysis, verification factor analysis, correlation analysis, and structural equation model analysis. The results of this study are as follows. First, the boxing club’s servicescape was found to have a positive impact on customer responses. Second, the boxing club’s servicescape showed to have a positive impact on customer trust. Third, the boxing club’s servicescape displayed a positive effect on customer satisfaction. Fourth, boxing club customer responses did a present positive impact on customer trust. Fifth, boxing club customer responses had a positive impact on customer satisfaction. Sixth, boxing club customer trust did have a positive impact on customer satisfaction.

원자력시설의 콘크리트 앵커시스템 규제요건

김상윤(Sang-Yun Kim),이재하(Jae-Ha Lee) 한국콘크리트학회 2011 콘크리트학회지 Vol.23 No.4

복싱클럽 관계혜택이 관계지속과 관계몰입 및 관계만족간의 구조관계

김상윤(Kim, Sang-Yun),김상유(Kim, Sang-Yoo) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.3

The purpose of this study is to identify the structural relationship between the boxing club’s benefits with the relation’s continuity, immersion, and satisfaction. The subjects of this study were 300 users from five boxing clubs in Seoul and Gyeonggi Province. Surveys were distributed, and 299 copies were used for the final analysis, excluding one case in which an insincere response was made. The data processing method used the SPSS 25.0 and AMOS 23.0 for frequency analysis, reliability analysis, verification factor analysis, correlation analysis, and structural equation model analysis. The results of this study are as follows. First, the relational benefits of the boxing club have been shown to have a positive effect on relationship continuity. Second, boxing club relational benefits have displayed a positive effect on relationship immersion. Third, relational benefits of the boxing club have had a positive effect on relationship satisfaction. Fourth, continuing boxing club relationships displayed a positive effect on relationship immersion. Fifth, continuing the boxing club relationship has a positive effect on the relationship satisfaction. Finally, the immersion in boxing club relationships stated a positive effect on relationship satisfaction.