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실시간 미디어 전송의 종단간 성능 향상을 위한 혼성 모니터링 기법
박주원,김종원,Park Ju-Won,Kim JongWon 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.10B
As real-time media applications based on IP multicast networks spread widely, the end-to-end QoS (quality of service) provisioning for these applications have become very important. To guarantee the end-to-end QoS of multi-party media applications, it is essential to monitor the time-varying status of both network metrics (i.e., delay, jitter and loss) and system metrics (i.e., CPU and memory utilization). In this paper, targeting the multicast-enabled AG (Access Grid) group collaboration tool based on multi-Party real-time media services, a hybrid monitoring scheme that can monitor the status of both multicast network and node system is investigated. It combines active monitoring and passive monitoring approaches to measure multicast network. The active monitoring measures network-layer metrics (i.e., network condition) with probe packets while the passive monitoring checks application-layer metrics (i.e., user traffic condition by analyzing RTCP packets). In addition, it measures node system metrics from system API. By comparing these hybrid results, we attempt to pinpoint the causes of performance degradation and explore corresponding reactions to improve the end-to-end performance. The experimental results show that the proposed hybrid monitoring can provide useful information to coordinate the performance improvement of multi-party real-time media applications. 네트워크 및 종단 노드의 시스템에 걸친 제한된 자원을 활용하여 실현되는 영상/음성 전달 서비스를 위한 멀티미디어 응용 프로그램의 품질을 보장하기 위해서는 지연, 지터, 손실과 같은 전송 상태와 CPU, 메모리의 사용량과 같은 시스템의 상태를 동시에 관찰하는 것이 필요하다. 본 논문에서는 액세스그리드 (Access Grid) 경우와 같이 IP 멀티캐스트 상에 동작하는 RTP/RTCP에 기반한 실시간 미디어 응용 프로그램을 대상으로 동적/정적 모니터링 방식을 혼용하여 멀티캐스트 상태와 시스템 상태를 측정하는 혼성 모니터링 방식을 제안한다. 또한 종단간 전송 품질이 저하된 경우 제안한 모니터링 방식에서 측정된 결과를 비교/분석하여 품질 저하의 원인을 판단하고 원인에 적합한 대응방안을 연계하고i라 한다. 이 결과를 바탕으로 네트워크/시스템의 상태 변화에 적응적인 영상/음성 전송 서비스의 가능성을 타진하고 종단간 전송 품질 저하 방지를 위한 효과를 예상한다.
효율적인 모바일 시스템 전력공급을 위한 전압 모드 2-페이스 벅 변환기
박주원,전인호,노정진,Park, Ju-Won,Jun, In-Ho,Roh, Jeong-Jin 한국전기전자학회 2014 전기전자학회논문지 Vol.18 No.3
Recently, Importance of power management circuit technology is increased with the development of portable electric devices. This paper presents a high performance DC-DC buck converter for mobile applications. Especially, presented design have low ripple voltages and driving capability of large load current. A designed voltage mode 2-phase DC-DC converter is implemented in a $0.35{\mu}m$ CMOS process, and the overall size is $2.35{\times}2.35mm^2$. The peak efficiency is 91% with a 4MHz frequency and the maximum load current is 4A. 최근 휴대용 전자기기의 발달로 인해 전력관리회로 기술의 중요성이 증가하고 있다. 본 논문에서는 휴대기기를 위한 고성능 DC-DC 벅 변환기를 설계하였으며 특히 출력에서의 리플 전압을 작게 하고 수 A급의 대용량 출력전류의 안정적인 구동이 가능하도록 2-페이스 구조를 사용하여 설계하였다. 설계된 전압모드 2-페이스 벅 변환기는 $0.35{\mu}m$ CMOS 공정을 통하여 칩으로 제작되었고 전체 칩의 크기는 $2.35{\times}2.35mm^2$, 동작주파수는 4MHz, 최대 4A의 부하전류를 구동할 수 있으며 최대 변환효율은 91% 이다.
누적 폭로지수를 이용한 유기용제 폭로량과 의무실 이용간의 관계
박주원,이순영,장재연,이경종,정호근,Park, Ju-Won,Lee, Soon-Young,Jang, Jae-Yeon,Lee, Kyung-Jong,Jeong, Ho-Gun 대한예방의학회 1998 Journal of Preventive Medicine and Public Health Vol.31 No.3
This study was conducted in order to clarify the factors affecting the number of utilization to health center for the shipyard workers who have been work in exposed environment to solvent. At first the tendencies of the number of utilization to health conte. in accordance with cumulative exposure(CE), lifetime weighted average exposure(LWAE), one's place of duty, work contents, states of using safety apparatus, the degree of the knowledge on handling solvents, exposure year. 1). The increase in the cumulative exposure(CE) war significantly higher in the number of utilization to health center. The group with longer exposure year showed significantly higher number of utilization to health center(p<0.01). Considering the work contents such as power blasting, spray, mixing and touch-up, the group of touch-up showed higher number of utilization to health center and this difference was statistically significant(p<0.001). Those who were not using the safety apparatus, showed higher number of utilization to health center, which was statistically significant(p<0.05). The degree of the knowledge on handling the solvent had no relation with using health center. 2) The results conducted from this study by multiple regression analysis in clarifying the factors affecting the number of utilization to health center, CE, exposure year and using safety apparatus was significant factor in utilization of health center.
시스템 결함 분석을 위한 이벤트 로그 연관성에 관한 연구
박주원(Ju Won Park),김은혜(Eun hye Kim),염재근(Jae keun Yeom),김성호(Sung ho Kim) 한국산업경영시스템학회 2016 한국산업경영시스템학회지 Vol.39 No.2
To identify the cause of the error and maintain the health of system, an administrator usually analyzes event log data since it contains useful information to infer the cause of the error. However, because today's systems are huge and complex, it is almost impossible for administrators to manually analyze event log files to identify the cause of an error. In particular, as OpenStack, which is being widely used as cloud management system, operates with various service modules being linked to multiple servers, it is hard to access each node and analyze event log messages for each service module in the case of an error. For this, in this paper, we propose a novel message-based log analysis method that enables the administrator to find the cause of an error quickly. Specifically, the proposed method 1) consolidates event log data generated from system level and application service level, 2) clusters the consolidated data based on messages, and 3) analyzes interrelations among message groups in order to promptly identify the cause of a system error. This study has great significance in the following three aspects. First, the root cause of the error can be identified by collecting event logs of both system level and application service level and analyzing interrelations among the logs. Second, administrators do not need to classify messages for training since unsupervised learning of event log messages is applied. Third, using Dynamic Time Warping, an algorithm for measuring similarity of dynamic patterns over time increases accuracy of analysis on patterns generated from distributed system in which time synchronization is not exactly consistent.
박주원 ( Park Ju-won ),나기현 ( Sohn Yong-woo ),손용우 ( Na Ki-hyun ),이증빈 ( Lee Cheung-bin ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
The study is intended to propose a systematic procedure for the development of the condition assessment based structures safety and cost effective performance criteria for design and upgrading of deteriorating bridge structures. A set of cost function models for life cycle cost analysis of bridge structures is proposed and thus the expected total life cycle costs include initial(design, testing and construction) costs, maintenance costs expected strength failure costs and expected service ability failure costs. Optimum safety indices are presented based on expected total cost minimization using only tree parameters, which are the level of the failure cost to the initial cost(τ), the extent of increased initial cost by improvement in safety(ν)and the order of the initial cost function(n). It may be expected that the proposed approach can be effectively utilized for the development of optimal performance criteria for design and upgrading of deteriorating bridge structures.
1ton/hr 산업보일러용 저 NOx 오일버너에서의 연소특성
박주원(Ju-Won Park),신명철(Myung-Chul Shin),김세원(Se-Won Kim),류태우(Tae-U Yu),양원(Won Yang),고영건(Young-Gun Ko) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Experiments were performed to investigate the combustion characteristics of low NOx burner for 1ton/hr industrial boiler, through the inflame measurement and flue gas analysis. Main combustion characteristics are shape of flame, NOx and CO concentrations, and radical distributions. Variable nozzles were used for liquid fuel injection to find out the combustion characteristics as the fuel atomization, and CCD camera was used to capture the radical distributions of flame. Through the experiments, we can obtain such goals as the low NOx of below 150ppm, CO of near zero corrected at O2 4%.
KI Cloud: 슈퍼컴퓨터를 통한 빅데이터 분석 및 머신 러닝 서비스 구축 방안
박주원 ( Ju-won Park ),이승민 ( Seungmin Lee ),정기문 ( Kimoon Jeong ),홍태영 ( Taeyoung Hong ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
전통적으로 기초 과학 분야의 대규모 워크로드 작업들은 슈퍼컴퓨터와 같은 대용량 클러스터 시스템을 이용하여 수행해왔다. 그러나 최근 빅데이터 및 머신 러닝과 같은 새로운 분야에서의 컴퓨팅 자원 요구가 증가하고 기존 사용자의 요구 사항도 다양해짐에 따라 기존의 클러스터 시스템 운영 환경에서는 많은 어려움이 나타나고 있다. 이러한 문제를 해결하기 위해 한국과학기술정보연구원(KISTI)에서는 지난 3 월부터 KI (KISTI Intelligent) Cloud 서비스를 개발하여 서비스를 제공하고 있다. KI Cloud 서비스는 다음과 같은 특징이 있다. 첫째, Jupyter 과 RStudio 와 같은 대화형 개발 환경을 웹을 통해 제공함으로써 사용자는 언제, 어디서나 손쉽게 서비스를 활용할 수 있다. 둘째, 컨테이너 기술을 활용하여 사용자가 요구하는 개발 및 실행 환경을 실시간으로 구성하여 제공한다. 셋째, 사용자의 서비스 환경을 동적으로 구성하여 제공함으로써 컴퓨팅 자원의 효율성을 높일 수 있다.