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.

Transthyretin in a PKU Mouse Model

박주원,이미희,최진옥,박혜영,정성철,Park, Ju-Won,Lee, Mi-Hui,Choe, Jin-Ok,Park, Hye-Yeong,Jeong, Seong-Cheol 대한유전성대사질환학회 2009 대한유전성대사질환학회지 Vol.9 No.1

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.

사용자 맞춤형 분산 컴퓨팅을 위한 컨테이너 기반 클러스터 관리 시스템

박주원(Ju-Won Park),함재균(Jaegyoon Hahm) 한국정보과학회 2015 정보과학회 컴퓨팅의 실제 논문지 Vol.21 No.9

전통적으로 고에너지 물리, 해양, 기상, 천문 우주 등 다양한 과학 분야에서 수천 코어 이상의 CPU를 사용하는 대규모 워크플로우 지원을 요구하고 있으며 이를 위해 대부분 슈퍼컴퓨터와 같은 클러스터 기반의 대용량 시스템이 활용되고 있다. 이러한 시스템은 다수의 사용자 및 기관에 의해 공유되고 있으며, 사용자들의 다양한 요구 사항으로 인해 시스템 운영 및 관리에 많은 어려움이 있다. 본 논문에서는 가상화로 인한 성능 저하 문제를 최소화하고 사용자가 원하는 환경을 동적으로 제공하기 위해 컨테이너 기반 클러스터 관리 플랫폼 방안을 제시하고 구축 사례를 소개한다. 본 논문의 의의는 다음 3가지로 볼 수 있다. 먼저, 컨테이너 기반 가상화 기술과 스케줄러 기능을 연동하여 큰 성능 저하 없이 대규모의 과학 워크플로우 지원을 위한 클러스터 구성 및 관리 방안을 제시하였다. 둘째, Docker 와 HTCondor를 활용하여 제시된 방안을 손쉽게 구축한 사례를 소개하였다. 셋째, 널리 활용되는 벤치마크 툴을 이용하여 Docker 성능을 검증하였으며, 다양한 프로그램 언어로 구현된 몬테카를로 시뮬레이션을 통해 과학 워크플로우 지원 예제를 제시하였다. Several fields of science have traditionally demanded large-scale workflow support, which requires thousands of central processing unit (CPU) cores. In order to support such large-scale scientific workflows, large-capacity cluster systems such as supercomputers are widely used. However, as users require a diversity of software packages and configurations, a system administrator has some trouble in making a service environment in real time. In this paper, we present a container-based cluster management platform and introduce an implementation case to minimize performance reduction and dynamically provide a distributed computing environment desired by users. This paper offers the following contributions. First, a container-based virtualization technology is assimilated with a resource and job management system to expand applicability to support large-scale scientific workflows. Second, an implementation case in which docker and HTCondor are interlocked is introduced. Lastly, docker and native performance comparison results using two widely known benchmark tools and Monte-Carlo simulation implemented using various programming languages are presented.

빅데이터 분석 및 머신러닝 서비스 제공을 위한 컨테이너 기반 HPC 클러스터 구축 방안

박주원(Ju-Won Park),이승민(Seungmin Lee) 한국산업경영시스템학회 2019 한국산업경영시스템학회 학술대회 Vol.2019 No.추계

Several fields of basic sciences such as meteorology, chemistry, and high-energy physics have required large-scale workloads. To support it, a high-performance system (HPC), which is optimized for parallel computing is widely used. Recently, due to the fourth industrial revolution, HPC computing resources are increasing demands in computer science fields such as big data analysis and machine learning. To support these new services, the existing HPC system has big troubles such as rigid SW configuration, high maintenance cost, and limited job type support. In this paper, we propose a container-based HPC cluster system architecture to solve these problems. The presented system architecture is used Docker for container execution and kubernetes as the container orchestration toolkit.

택지개발지구의 입지 및 토지이용 특성에 관한 연구

박주원 ( Ju Won Park ),박정현 ( Jeong Hyun Park ) 조선대학교 공학기술연구원 2010 공학기술논문지 Vol.3 No.1

This study examined the appropriateness of land use plan and district unit plan with housing sites developed in Gwangju metropolitan city and as a result of examining area ratio, design structure, building location and use, the following results were obtained. According to the increase of population and housing site development accommodation for last 20 years, the population of housing site development was greatly increased compared to population increase and this phenomenon caused movement of population in inner city rather than inflow of population from the outside of city as well as physical environment deterioration and inner city decline. Housing site development project of Gwangju metropolitan city showed location type developed by surrounding downtown with semi-encircled except neighborhood of Mt. Mudeung and K type combining flathead type developed along the Yeongsan river. It is the result of developing natural green belt which is easy to develop large-scale housing sit and future housing site development needs to consider urban space structure. While the ratio of residential site was reduced with the land use plan of housing site development district for 20 years, public facility site tends to increase and in particular park and green belt area increased, but the ratio of road was relatively reduced. In addition, the detached house site was reduced but the ratio of commercial site was within 5% and showed no great change. Such an increase of park and green belt was related to people`s orientation and change of social trend, but the location of this site showed no qualitative growth as the increase of area.

빅데이터 분석 및 머신러닝 서비스를 위한 컨테이너 기반 HPC 클러스터 구축 및 성능 분석

박주원(Ju-Won Park),이승민(Seungmin Lee),홍태영(Taeyoung Hong) 한국정보과학회 2021 정보과학회 컴퓨팅의 실제 논문지 Vol.27 No.5

기상, 화학, 고에너지 물리와 같은 기초 과학 분야의 대규모 워크로드를 실행하기 위해 대규모의 클러스터 시스템에서는 병렬 컴퓨팅에 최적화된 시스템 환경을 구축하여 서비스를 제공하고 있다. 그러나 최근 4차 산업 혁명으로 인하여 빅데이터 분석, 머신 러닝과 같은 새로운 형태의 사용자 요구 사항이 제시됨에 따라 기존 클러스터 시스템에서는 경직된 소프트웨어 구성, 유지 보수 비용 증가, 제한된 작업형태 지원 등 많은 어려움에 직면해 있다. 이러한 어려움을 해결하기 위해 본 논문에서는 컨테이너 기반 HPC 클러스터 구축 방안을 제시한다. 제시된 구축 방안에서는 컨테이너 기술을 활용하여 클러스터 시스템의 소프트웨어 스택을 간결화함으로써 자원 유연성을 향상시켜 사용자 맞춤형 서비스가 가능하다. 실험환경은 컨테이너 실행 데몬으로 Docker, 컨테이너 관리 툴킷으로는 kubernetes를 활용하여 구축했으며 HPL, HPCG, NPB benchmark 툴킷을 이용하여 다양한 워크로드에 대한 계산 성능 측정 결과를 제시한다. Several fields of basic sciences, such as meteorology, chemistry, and high-energy physics, require large-scale workload. To support it, a high-performance computing (HPC) system, which is optimized for parallel computing, is widely used. Recently, due to the fourth industrial revolution, there has been an increasing demand for HPC resources in computer science fields, such as big data analysis and machine learning. To support these new services, the existing HPC system has major problems, such as rigid software configuration, high maintenance cost, and limited job type support. In this paper, we propose a container-based HPC cluster system architecture to solve these problems. The presented system architecture uses Docker for container runtime engine and kubernetes as the container orchestration toolkit.

2014~2016년 동안 경남지역 소규모 급수시설에 대한 건강 위해성 평가 연구

박주원(Ju-Won Park),손송이(Song-Ee Son),이후장(Hu-Jang Lee) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.3

Objectives: This study was investigated the characteristics of small-scale water works (SWW) in Gyeongnam area and conduct a health risk assessment of water-quality inspection items unfitted for water-quality standards (WQS). Methods: The characteristics of SWW in Gyeongnam province were analyzed using the data of SWW in the last three years (2014~2016) published in National Waterworks Information System. In addition, the health risk assessment for inspection items unfitted for WQS was carried out in four steps: hazard identification, dose-response assessment, exposure assessment, and risk characterization. Results: The total number of SWW in Gyeongnam area was gradually decreased from 2014 to 2016. In addition, drinking water sources of SWW were in the order of ground water, valley water, spring water, surface water, and river-bed water. The number of points unfitted for WQS in SWW by year was 22, 45, and 18 in 2014, 2015, and 2016, respectively, and a total of 112 points were found to unfit for WQS in SWW during 2014?2016. The hazard quotient (HQ) for fluoride, nitrate nitrogen, boron in the unfitted points for WQS was more than 1.0, and the mean values f or turbidity and color in points unfitted for WQS were 2.38 nephelometric turbidity unit and 16.25 color unit, respectively. Conclusions: The HQ for fluorine, nitrate nitrogen and boron was more than 1.0 in points unfitted for WQS among SWW in Gyeongnam area, and the turbidity and the color degree exceeded WQS, which mean that there is a possibility of harmful impacts on the human health.

교량구조물에 대한 생애주기비용의 의사결정기법

박주원 ( Park Ju-won ),나기현 ( Na Ki-hyun ),손용우 ( Sohn Yong-woo ),이중빈 ( Lee Cheung-bin ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1

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 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(ETLCC) include initial(design, testing and construction) costs and direct · indirect damage costs considering repair · replacement costs, human losses and property damage costs, road user costs, and indirect regional economic losses 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). From the numerical invetigations. it may be positively stated that the proposed optimum design procedure for bridge structures based on the ETLCC will lead to more rational, economical and safer design.