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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.
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.
인공신경망을 이용한 손상된 철근콘크리트 슬래브교의 상태평가 및 휨설계기법개발
박주원 ( Park¸ Ju-won ),박경환 ( Park¸ Kyung-hwan ),손용우 ( Sohn¸ Young-woo ),이증빈 ( Lee¸ Cheung-bin ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The objective of this study is to develop a condition assessment model based on artificial neural network that can be used to analyze the mechanical flexural design behavior of slab bridge with damages and the flexural design program behavior of damaged slab bridge. A modified rating factors that can be applied to flexural design method algorithm is used to reflect the external condition assessment, the required strengthening moment computed from the rating factors is considered as additional moment term acting on slab and represent the effect of external condition. The accuracy of the proposed algorithm is verified by comparing the analysis results with the field measurement data from other studies and the analysis results based on ultimate strength theory. The debeloped damage model is applied to the analysis of slab bridge with damage under nonlinear elastic condition. The comparisons confirmed that the quantitative analysis of required strengthening thickness of the fiber-reinforced epoxy panel(FREP) due to optimum neutral position.
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.