포워드캐스트(ForwardCast) : P2P에서의 새로운 VoD 스트리밍 방법

윤수미,김상철,김중환,Yoon Soo-Mi,Kim Sang-Chul,Kim Joong-Hwan 한국정보처리학회 2005 정보처리학회논문지B Vol.12 No.7

최근 P2P(Peer-to-Peer) 네트워크를 VOD(Video On Demand) 스트리밍에 적용하는 연구들이 활발히 발표되고 있다. VOD 스트리밍에 관한 기존 연구를 살펴보면, 클라이언트의 새로운 서비스 요청시, 초기 지연을 없애는 전송과 서비스 기각률을 최소화하는 것을 가장 중요한 목표로 삼고 있다. 본 논문은 이들 목표를 달성하기 위해서 P2P 기반의 멀티캐스팅 트리를 이용해서 효과적으로 비디오 스트리밍(streaming)을 제공하는 새로운 방법, 일명 포워드캐스트(ForwardCast)를 제안한다. 제안된 방법은, 새로운 클라이언트는 초기 지연없이(zero-delay) 비디오를 전달받고, 경우에 따라서는 데이터의 앞, 뒤 부분을 동시에 전송받기도 한다. 실험 결과, 포워드캐스트는 기존 연구에 비해서 서버 부하를 증가시키지 않으면서 기각률을 낮출 수 있었다. Recently researches that apply P2P networks to VOD streaming have been actively published In the previous works on VOD streaming, they aimed at achieving two major goals, which are zero-delay transmission and minimization of service rejection ratio. This paper proposes a new method, called ForwardCast, for VOD streaming based on a P2P-based multicasting tree in order to achieve theses two goals. In this method,- basically a new client selects one of the preceding clients and starts receiving a whole video from the selected one without any delay. In some situation, two preceding clients are selected to transfer the ending part of the video and its the remaining part simultaneously. In our experiment, ForwardCast can reduce the rejection ratio compared to previous works without increasing server stress.

Treatment of Complicated Exudative Pleural Effusions with Image-Guided Drainage and Adjunctive Pleural Urokinase Therapy

윤수미 ( Su Mi Yoon ),손동현 ( Don Hyun Sohn ),양석철 ( Seok Chul Yang ),윤호주 ( Ho Joo Yoon ),신동호 ( Doug Ho Shin ),박성수 ( Sung Soo Park ),이정희 ( Jung Hee Lee ) 대한내과학회 1999 대한내과학회 추계학술대회 Vol.57 No.-

유·무산소성 운동이 중년여성들의 산화스트레스지표와 혈행개선에 미치는 영향

윤수미(Soo Mi Yoon),노재성(Jae Sung Roh) 한국발육발달학회 2018 한국발육발달학회지 Vol.26 No.3

This study is a comparative analysis of the effect of aerobic and anaerobic exercise on oxidative stress index and blood circulation improvement in middle aged women. The subjects were 20 middle-aged women who were registered to G metropolitan city W fitness and divided into 10 exercise groups and 10 control groups who did not take any medication or disease. We performed aerobic and anaerobic exercises three times a we ek for 8 weeks. The results of oxidative stress index and blood circulation improvement before and after exercise were as follows. Changes in the oxidative stress index of middle-aged women participating in both aerobic and anaerobic exercise showed no significant interaction effect between the groups at the time × group, but there was a significant difference between the groups. Changes in HDL-C and LDL-C of middle-aged women participating in both aerobic and anaerobic exercises showed no significant differences between groups, although there was a synergistic effect between the periods × groups. The changes in TG of middle-aged women participating in both aerobic and anaerobic exercise showed a synergistic effect between periods × groups, and there were significant differences among groups. The change in TC of middle-aged women participating in aerobic and anaerobic exercise showed no interaction effect between group and time x group and there were significant differences in the change according to the measurement time. Taken together, these results suggest that aerobic and anaerobic exercise for 8 weeks is an effective exercise method for middle-aged women due to decrease of oxidative stress index and decrease of blood circulation. I think that by providing a place for those who want to aerobic and anaerobic exercise and allowing them to exercise in their leisure time, they will be able to prevent obesity and lifestyle disease and live a healthy life in middle age.

타바타 운동이 중년여성의 신체 구성 물질과 유해산소에 미치는 영향

윤수미(Yoon, Soo-Mi),서영환(Seo, Young-Hwan) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.6

This study was conducted to evaluate the Tabata workout for eight weeks with a target of eight middle-aged women appear to have any effect on body composition material and radical. Subjects was conducted three times a week for eight weeks movement, by presenting the average standard deviation of the results was performed by paired t verification method to verify the differences before and after, were derived as follows. One, change in body composition material, except for the body fat in the comparison exercise group, weight, body water, protein, minerals decreased the post minutely than the advance, was not a statistically significant difference in the movement group comparison. Two, a change of harmful oxygen were significantly lower than before the experiment after experiment in the exercise group compared (p<.05), showed a statistically significant change in the exercise group compared. When we saw the conclusion of the above, Tabata exercise is the body’s constituents did not show any positive effect but in the radical changes of substance have seen the positive effects. In future studies, controlled by a Tabata workout to the portion that can control the experimenter with regard to body composition material it should come to be more and more good results, It analyzes the changes in the body’s ability and the antioxidant with the ability to inhibit oxidation in the body to remove the free radicals generated by the various subjects with the cause, are thought to be preventable by lifestyle-related diseases and various diseases, Tabata the research on exercise is to think that we can continue to be made in the future.

WAP 환경에서의 다이어트 식단 시스템의 설계 및 구현

윤수미(Soo-Mi Yoon),김미영(Mee-Young Kim),김상철(Sang-Chul Kim) 대한전자공학회 2001 대한전자공학회 학술대회 Vol.2001 No.6

다수의 컨텐츠서버를 이용한 포워드캐스트(ForwardCast)스트리밍 방법

윤수미 ( Soo-mi Yoon ),김상철 ( Sang-chul Kim ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.1

우리는 P2P 네트워크 환경하에서 멀티캐스팅 스트리밍 전송방법으로서 포워딩 스트림(forwarding stream)전송 방법을 사용한다. 일명 포워드캐스트(forwardcast)는 P2P 네트워크 환경과 멀티캐스팅 전송에 바탕을 두고, 클라이언트들의 자원을 효율적으로 이용함으로서 초기 클라이언트의 요청 기각률을 낮출 수 있었다. 본 연구에서는 이를 다수의 컨텐츠서버 환경에 적용시킴으로서 하나의 서버에 집중되는 부하를 분산시킴과 동시에 초기 클라이언트의 기각률을 보다 낮추고자 한다. 실험결과 그 성능을 확인할 수 있었다.

Davinci Bodyboard 운동이 중년여성들의 골반 밸런스와 활성산소에 미치는 영향

윤수미(Soo-Mi Yoon),노재성(Jae-Sung Roh) 한국발육발달학회 2019 한국발육발달학회지 Vol.27 No.3

The purpose of this study was to investigate the effects of Davinci Bodyboard exercise on pelvic balance and active oxygen species in middle aged women. Total exercise was performed for 12 weeks, 3 times a week for 40 minutes a day. The following conclusions were analyzed based on the results of two measurements before and after the Davinci Bodyboard exercise. After the Davinci Bodyboard exercise, the pelvic balance decreased after the exercise and statistically significant difference was observed. In addition, active oxygen species decreased after exercise and showed statistically significant difference. In conclusion, the Davinci Bodyboard exercise showed a very positive effect on pelvic balance changes, and that active oxygen was also more effective than the general population. If the Davinci Bodyboard exercise is known to many people in the future, it will be possible to exercise effect regardless of ages, and pelvic balance and active oxygen may also prevent various lifestyle diseases.

Quality Adaptation을 위한 분산 프록시 모델

윤수미(Yoon Soo Mi),김상철(Kim Sang Cheul) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ

프록시 서버는 점차 다양해지고 있는 클라이언트의 이질성(heteroginiety)과 이에 따른 서버와 네트워크의 과부하를 해결하기 위한 방법으로 제시되고 있다. 본 연구에서는 분산된 프록시 서버 환경에서 주어진 프록시들의 부하 균형을 위하여 각 비디오 객체의 계층(layer)들을 서로 다른 프록시에 분리하여 저장하였다가 필요시 전송함으로서 네트워크 환경에서 특정 프록시 서버로의 집중과 혼잡성을 줄이도록 한다. 이로서 적응적인 화질(Quality Adaptation)을 보장하기 위한 계층적 코딩(layered coding) 스트리밍 서비스를 보다 효율적으로 제공할 수 있다.

다수의 트랜스코딩 프록시 환경하에서 효율적인 이미지 전송을 위한 프록시 선택 방법

윤수미(Soo-Mi Yoon),김상철(Sang-Chul kim) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅲ

인터넷 환경에서 프록시(proxy)는, 효율적인 데이터의 전송을 위해 다양한 클라이언트 장치들과 WWW서버들간의 다리역할을 수행한다. 특히, 최근의 인터넷 환경은 이미지 같은 복잡하고 대량의 크기를 갖는 데이터 전송을 많이 요구하고 있으므로, 클라이언트 환경에 맞는 최선의 화질과 최소의 지연시간을 갖도록 데이터를 변환하여 제전송하는 트랜스코딩(transcoding)이 중요시되고 있다. 본 연구에서는 트랜스코딩을 수행하는 다수의 프록시들이 존재할 때, 클라이언트의 요구(request)와 정치(device), 또는 네트워크의 여러 가지 조건에 가장 적합한 프록시를 선택할 수 있는 수리적인 모델을 제안한다. 이러한 수리적 모델은 경로연결기(redirector)내에서 동작하는 알고리즘으로서, 예상되는 지연시간과 오버플로우의 가능성을 최소화할 수 있는 최선의 프록시를 클라이언트와 서버사이에 연결함으로서 이미지 전송에 있어서 더 큰 효과를 얻을 수 있다. 실험 결과, 전체적인 지연시간을 줄일 수 있을 뿐만 아니라 클라이언트에게 적절한 양과 질의 데이터 전송효과를 가진다.

TABATA 운동이 경계성 비만 중년여성들의 간기능 개선과 대사증후군 위험인자에 미치는 영향

윤수미(Soo-Mi Yoon),서영환(Young-Hwan Seo) 한국발육발달학회 2019 한국발육발달학회지 Vol.27 No.2

The purpose of this study was to investigate the effects of TABATA exercise on the improvement of liver function and the risk factors of metabolic syndrome by applying it to middle-aged women with borderline obesity. The subjects were exercised for 8 weeks, 3 times a week, and 60 minutes a day. The results were as follows based on the results of two measurements before and after the TABATA exercise. After TABATA exercise, there was a statistically significant difference in body weight and significant results were obtained. There was a significant decrease in AST and ALT in liver function improvement and a significant decrease in γ-GTP but no statistically significant results. The risk of metabolic syndrome was decreased in the blood glucose level, and significant results were obtained. The systolic and diastolic blood pressures also decreased, and statistically significant results were obtained. In addition, the decrease in triglyceride and the increase in HDL-C were statistically significant. Taking these conclusions together, the TABATA exercise is thought to be a positive change in the body fat percentage, liver function improvement, and metabolic syndrome risk factors of middle-aged women with borderline obesity. It is suggested that middle-aged women with borderline obesity or obesity are suggestive exercise methods for healthy life from middle age to old age through body change, liver function improvement and blood change. I think that if I apply TABATA exercise to various subjects, I can verify the effect of the exercise.