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K / MoS2 촉매상에서 일산화탄소와 수소로부터의 혼합알코올제조에 관한 반응속도식의 모델링
박태윤,우희철,남인식,김영걸 ( Tae Yun Park,Hee Chul Woo,In Sik Nam,Young Gul Kim ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.1
A kinetic model on the synthesis of mixed alcohol from CO and H₂ over K/MoS₂ catalyst has been developed. The formation of linear mixed alcohol can be elucidated by CO insertion mechanism so that a rigorous kinetic network has been developed to derive the kinetic model that well describes the conversion and selectivity of products. Kinetic model derived in this study consists of 40 coupled nonlinear differential equations with the steady state approximation for reaction intermediates. The model well predicted the experimental observations within the experimental condition. The effect of reaction conditions on the catalytic activity was also examined. Optimal temperature of CO conversion for alcohols was ca. 320℃ and the higher the reactor pressure the more alcohols are produced.
박태윤,정재우,장주영,최재철,신종욱,박인원,최병휘,김재열 대한결핵및호흡기학회 2018 Tuberculosis and Respiratory Diseases Vol.81 No.2
Background: Eosinophilia is well recognized in specific conditions. The objective of the present study was to determine clinico-radiologic characteristics of eosinophilia and changes in prevalence over 10 years in recipients of private health screening program at a tertiary hospital in Korea. Methods: Data of private health screening program recipients at the health promotion center of Chung-Ang University Hospital from 2004 to 2013 were collected. Health-related questionnaires and laboratory findings of private health screening program with possible relation with eosinophilia were reviewed. Results of enzyme-linked immunosorbent assay (ELISA) for parasite, chest computed tomography, and pulmonary function test were also reviewed. Results: The cumulative prevalence of eosinophilia was 4.0% (1,963 of 48,928). Prevalence of eosinophilia showed a decreased trend from 2004 to 2013. Most cases (96.6%) had mild degree of eosinophilia. Eosinophilic subjects were older and male-predominant. They showed lower levels of forced expiratory volume in 1 second (FEV1%), forced vital capacity (FVC%), and FEV1/FVC than those without eosinophilia. Eosinophilic subjects showed higher positive rate for common parasite in ELISA than those without eosinophilia. On radiologic findings, consolidation and ground glass opacities were positively associated with the degree of eosinophilia. When eosinophil was classified based on severity, statistically significant correlation between the severity of eosinophil and radiologic abnormalities was found. Conclusion: Eosinophilia is uncommon in healthy population. It usually occurs at a mild degree. Eosinophilic patients have more radiologic abnormalities compared to those without eosinophilia. Such radiologic abnormalities are associated with the severity of eosinophilia.
교통약자 이동지원 서비스의 사회적 가치 추정 연구: 장애인콜택시의 통행시간 질적 수준 개선을 중심으로
박태윤,박경아 한국교통연구원 2023 交通硏究 Vol.30 No.4
Since the enactment of the Act for the Promotion of Convenience in the Mobility of Vulnerable Populations, the central government and local authorities have been taking the lead in implementing projects to improve and expand transportation means, passenger facilities, and pedestrian environments for people with disabilities and the elderly. However, the inconvenience in mobility for vulnerable populations remains a serious issue. While multifaceted efforts are being made to secure the mobility rights of vulnerable populations, research on the effectiveness of service expansion and its societal value is not actively conducted. Most domestic mobility support services for vulnerable populations are primarily funded and driven by local governments or public agencies, making it challenging to expand services due to issues related to funding and operational efficiency. To activate services with high societal value, there is a need for national consensus on service operation, which can lead to sustainable funding and operations. This study aims to estimate the qualitative improvement effect of travel time, one of the societal values associated with mobility support services for vulnerable populations. It analyzes the factors influencing this effect by utilizing Contingent Valuation Method (CVM) to estimate the Willingness to Pay (WTP) of users of disability call taxis residing in Seoul, South Korea. The survey includes general information about the survey participants and open-ended questions related to their use of disability call taxis, as well as an analysis of the factors affecting WTP. 교통약자 이동편의 증진법 제정 이후 중앙정부와 지자체가 중심이 되어 장애인, 고령자 등 교통약자를 위한 교통수단, 여객시설, 보행환경 개선 및 확충사업 등을 시행하고 있지만 교통약자의 이동 불편은 여전히 심각하다. 교통약자의 이동권 확보를 위해 다각적인 노력이 진행되고 있지만 서비스 확충 효과 또는 사회적 가치에 관한 연구는 활발히 이루어지고 있지 않다. 국내 교통약자 이동지원 서비스는 지자체 또는 공공기관 등 재정사업으로 추진되는 경우가 대부분이며, 재원 확보 및 운영 효율성의 문제로 서비스의 확충이 어려운 것이 현실이다. 사회적 가치가 높은 서비스의 활성화를 위해선 서비스 운영에 대한 국민적 공감이 필요하며, 이를 통한 재원 확보 및 운영의 지속가능성을 확보할 수 있다. 본 연구에서는 교통약자 이동지원 사업이 갖는 사회적 가치 중 통행시간의 질적 개선 효과에 대해 추정하고 이에 영향을 미치는 요인을 분석하고자 서울특별시에 거주하는 장애인콜택시 이용자를 대상으로 CVM(조건부가치추정법)을 활용하여 지불가능의사액(Willingness to pay)을 추정하였고, 이를 기반으로 교통약자 모빌리티 서비스 활성화를 위한 정책제언을 제시하였다.