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박희원,박수경 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.5
The role of push-off propulsion as a major source of energy generation to compensate for heel strike collisions has been emphasized analytically and experimentally. The predicted increase of push-off forces with gait speeds, however, may be physiologically limited by intrinsic muscle mechanics. In this study, we examined whether the contribution of push-off propulsion to step-to-step transition is restricted with gait speed. Seven healthy young subjects participated in over the ground walking experiments. Ground reaction forces (GRFs) were measured at four different gait speeds ranging from self-selected to the maximum gait speed. The results showed that the vertical push-off force showed saturation, whereas the horizontal push-off forces proportionally increased with speed. The configuration of the trailing leg showed greater forward leaning during faster gait trials, which increases the horizontal push-off force without a significant increase in the total push-off forces. In contrast, both vertical and horizontal heel strike forces increased with speed. The lack of energy supplied by push-off to counter the heel strike collision loss during the double support phase was followed by an increase in the GRF work during the single support phase. These results imply that the intrinsic muscle mechanics limit the compensatory increase in the push-off force against the heel strike collision loss at faster gait speeds, which then leads to changes in the leg configuration to guarantee horizontal propulsion so as to maintain a steady forward gait speed.
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박희원,이종협 한국자료분석학회 2009 Journal of the Korean Data Analysis Society Vol.11 No.2
In this paper, we investigate the association between environmental factors and monthly mortality of cerebrovascular disease over 10 years (January 1995 - December 2004) in Seoul. We show that monthly cerebrovascular mortality has a negative binomial distribution using Kolmogorov-Smirnov test. To determine lag effects of environmental factors upon monthly mortality, we compare the relative risks of six different lag models with a maximum lag of 5 months. We also conduct correlation analysis for each environmental factor with its lagged variables and monthly mortality. We employ a negative binomial regression model to regress monthly cerebrovascular-disease death counts for four air pollutants, temperature and relative humudity, controlling for long-term and seasonal trends. We conclude that 4-month and 5-month lagged concentration of O_3 and 4-month lagged relative humidity are significant risk factor for cerebrovascular mortality. 본 연구는 환경요인과 한국인의 3대 주요사인으로 알려진 뇌혈관 질환 사망자 사이의 연관성을 규명하기 위해 1995년 1월부터 2004년 12월까지의 서울시 월별 뇌혈관 질환 사망자 자료와 대기오염물질(SO_2, O_3, NO_2, PM_10), 기상변수(평균기온, 평균상대습도)를 사용하여 분석을 실시하였다. 분석에 앞서 콜모고로프-스미르노프 검정을 통해 서울시 월별 뇌혈관 질환 사망자가 음이항 분포를 따름을 검정하고, 기본 모형 하에서 6가지 환경요인들에 대한 최대 5개월간의 시차변수들의 상대위험을 비교하였다. 환경요인과 사망자 사이에 교락요인으로 작용할 수 있는 추세성분과 계절성분을 조정하고, 환경요인들의 지연효과를 고려하기 위해 환경요인의 시차변수들을 음이항 회귀모형에 고려하여 분석을 실시하였다. 분석결과 오존, 평균상대습도가 서울시 월별 뇌혈관 질환 사망자에 유의한 영향을 미치고 있는 것으로 나타났다.
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배달과 테이크아웃 이용고객의 환경인식, 친환경노력 및 친환경부담금 지불의사에 대한 연구
박희원,정유경 한국외식경영학회 2023 외식경영연구 Vol.26 No.4
The purpose of this study is to analyze the influence of environmental perception, eco-friendly efforts, and intention to pay eco-friendly charges, and the overall experience of delivery and take-out was evaluated. To verify the established research hypothesis, a total of 550 copies of data. Using the SPSS statistical program to find out demographic and usage characteristics. As a results of the research hypothesis, the higher the environmental awareness of consumers using delivery and take-out, the more they affect eco-friendly efforts to exclude actions that directly or indirectly cause environmental problems in daily life, and the significant influence between variables. These results are believed to be useful for the government or companies to implement levies for the environment by grasping consumers' perceptions regarding waste issues arising from delivery and take-out of the growing food service industry.
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박희원,이명호,이근만 청주대학교 산업과학연구소 1990 産業科學硏究 Vol.8 No.-
This paper discuss the pipelined scheduling technique, especially focuses on resource sharing and delay insertion. By using Delay Insertion Technique in pipelined scheduling process, we can get the Minimal- Cost and Maximal Speed scheduling result. The scheduling process and delay insertion process are combined to get a formal program module, finally to get a efficient synthesis tool.
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박희원,조재호,문선여,박충화,황철홍,김성찬,남동군 한국화재소방학회 2014 한국화재소방학회논문지 Vol.28 No.1
The high predictive performance of fire detector models is essentially needed to assure the reliability of fire and evacuationmodeling in the process of Performance-Based fire safety Design (PBD). The main objective of the present study isto measure input information in order to predictive the accurate activation time of fixed temperature heat detectorsadopted in Fire Dynamics Simulator (FDS) as a representative fire model. To end this, Fire Detector Evaluator (FDE)which could be measured the device properties of detector was used, and the spot-type fixed temperature heat detectors oftwo thermistor types and one bimetal type were considered as research objectors. Activation temperature and ResponseTime Index (RTI) of detectors required for the fire modeling were measured, and then the RTI was measured for ceilingjet flow and vertical jet flow in consideration of the install location of detectors. The results of fire modeling using measureddevice properties were compared and validated with the experimental results of full-scale compartment fires. It wasconfirmed that, in result, the numerically predicted activation time of detector showed reasonable agreement with themeasured activation time. 성능위주 소방설계(PBD)의 과정에서 화재 및 피난모델링의 신뢰성을 확보하기 위해서는 화재감지기 모델의 높은 예측성능이 필수적으로 요구된다. 본 연구의 목적은 대표적인 화재모델인 FDS에 적용되고 있는 정온식 열감지기의 정확한작동 개시시간을 예측하기 위한 입력정보를 측정하는 것이다. 이를 위해 화재감지기의 장치특성을 측정할 수 있는 FireDetector Evaluator (FED)가 사용되었으며, 국내에서 적용되는 2개의 써미스터 방식(Thermistor types)과 1개의 바이메탈 방식(Bimetal type)의 스포트형 정온식 열감지기가 연구대상으로 고려되었다. 화재모델링을 위해 요구되는 감지기의작동 개시온도 및 반응시간지수(Response Time Index)가 측정되었으며, 이때 RTI는 감지기의 설치위치를 고려하여 천장제트기류(Ceiling jet flow)와 수직제트기류(Vertical jet flow)에 대하여 측정되었다. 측정된 장치물성을 이용한 화재모델링 결과는 실규모 구획화재실험 결과와 비교·검증되었다. 그 결과 수치적으로 예측된 감지기의 작동 개시시간은 실험결과를 적절히 잘 예측함을 확인하였다.
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