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우정만 ( Jung-man Woo ),김은기 ( Eun-gi Kim ),권영도 ( Young-do Kwon ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
인터넷 전송계층 프로토콜에는 TCP와 UDP가 있다. TCP는 연결형 프로토콜로서 에러 제어 및 흐름 제어를 제공하여 신뢰성있는 데이터 전송은 보장하지만 그에 따른 전송 지연이 발생한다. 반면에 UDP는 비연결형 프로토콜로서 에러 제어 및 흐름 제어를 수행하지 않으므로 데이터 전송에 있어 지연이 발생되지 않아 실시간 전송은 보장하나 신뢰성있는 데이터 전송을 보장할 수 없다. 따라서 현재의 인터넷 전송계층 프로토콜에서는 실시간 전송기능을 제공하는 동시에 높은 수준의 신뢰성을 보장하여야 하는 데이터의 전송에 적당한 프로토콜이 없다. 본 논문에서는 리눅스(Linux)커널(Kernel)의 TCP의 에러제어 및 흐름제어를 수정하여 실시간 전송기능을 제공하는 동시에 높은 수준의 신뢰성을 보장하는 새로운 프로토콜을 설계, 구현하였다. 본 연구에서 설계된 실시간 전송기능을 지원하는 TCP 프로토콜은 기존의 TCP에 새로운 옵션을 추가함으로써, 기존 TCP와의 호환성을 유지할 수 있도록 하였다.
산림휴양지 유형에 따른 피톤치드(모노테르펜) 농도 비교
이용기,우정식,최시림,신은상,Lee, Yong-Ki,Woo, Jung-Sik,Choi, Si-Rim,Shin, Eun-Sang 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.4
Objectives: This study was conducted to provide scientific and effective information on phytoncides, which are associated with forest healing, and to activate recreational forests. Methods: The target sites were natural recreation forests, a forest park and an arboretum, and the control sites were three urban parks. The samples were collected at a volume of 6.0 L and a flow rate of 0.1 L/min for one hour using a low volume pump and the solid adsorbent sampling method. The phytoncide compounds adsorbed in the Tenax TA tube were analyzed by a automatic heat desorption unit and GC-MS. Results: By type of recreational forest, the annual concentrations of phytoncide (monoterpene) for the forest park showed the highest concentration with $1.450{\mu}g/m^3$, while those for the arboretum showed the lowest concentration at $0.892{\mu}g/m^3$, and thus the concentration of the forest park was approximately 1.6 times higher than the arboretum. The season showing the highest concentration of phytoncides was summer (June) and the forest park was the highest among the recreational forests. The concentrations of major components for phytoncide showed in descending order: ${\alpha}-pinene$, ${\beta}-pinene$, camphene, 3-carene and limonene. The seasonal concentration of ${\alpha}-pinene$, camphene and ${\beta}-pinene$ by type of recreational forest increased in April, which is characterized by low temperature and humidity, and the seasonal concentration of camphene decreased with higher humidity. The meteorological factors which had the high correlation with the concentration of total terpene were temperature and humidity. $CO_2$ and $O_2$ showed an inverse correlation. Conclusion: The major components of phytoncide were ${\alpha}-pinene$, ${\beta}-pinene$, camphene, 3-carene and limonene in descending order of concentration. Further and systematic study on the chemical nature of individual phytoncides, and on the effect of phytoncides on humans needs to be performed.
류마티스관절염 동물모델에서 메토트렉세이트의 STAT3-TH17/STAT5-Treg Axis 조절을 통한 관절염의 치료효과
박은미 ( Eun Mi Park ),박미경 ( Mi Kyung Park ),이동건 ( Dong Gun Lee ),백승예 ( Seung Ye Baek ),우정원 ( Jung Won Woo ),곽승기 ( Seung Ki Kwok ),조미라 ( Mi La Cho ),박성환 ( Sung Hwan Park ) 대한류마티스학회 2013 대한류마티스학회지 Vol.20 No.2
Objective. Methotrexate is the first-line drug in treatment of rheumatoid arthritis (RA) exhibiting higher efficacy and better tolerability than most other DMARDs. To have a better understanding of the anti-arthritic mechanism of methotrexate, we investigated the effect of methotrexate on suppressing the autoimmune inflammatory and destructive arthritis in collagen-induced arthritis (CIA) mice. Methods. The effects of methotrexate on joint inflammation were assessed by clinical scoring and histologic analysis. Levels of cytokines and autoreactive antibodies were analyzed by immunohistochemistry and ELISA. The population of TH17 and Foxp3+ regulatory T (Treg) cells and phosphorylation of their critical transcription activators, STAT3 and STAT5, were examined by fluorescence microscopy and flow cytometry, respectively. Results. Treatment with methotrexate significantly alleviated joint inflammation and cartilage destruction in CIA. Serum levels of total immunoglobulins G, G1, G2a specific to type II collagen were also reduced considerably in methotrexate- treated mice. The drug inhibited the expression of proinflammatory cytokines such as IL-1β, TNF-α, IL-6 and IL-17 in arthritic joints ex vivo as well as by splenocytes in vitro. Moreover, methotrexate treatment resulted in reciprocal modulation of TH17 cells and Foxp3+ regulatory T (Treg) cells in spleen tissues, in which TH17 cells were decreased and Treg cells in number were increased. Subsequent analysis of CD4+T cells showed that phosphorylation of STAT3 was decreased whereas phosphorylation of STAT5 was increased in methotrexate-treated mice. Conclusion. Methotrexate treatment effectively suppressed autoimmune arthritis and restored homeostasis of the immune system by reciprocal regulation of TH17 and Treg cells in a mouse model of collagen-induced arthritis.
모바일 위젯기반 개인화 서비스의 영향 요인에 관한 연구
이지은(Ji-Eun Lee),신민수(Minsoo Shin),우정은(Jung-Eun Woo) 한국IT서비스학회 2010 한국IT서비스학회지 Vol.9 No.2
As digital convergence and mobile services evolve. personalization becomes one of the most important factors attracting customers. Personalization means functions offering individually customized services with relevant contents using information on individual preferences. This 50rt of personalized services has attracted great attention of a large part of online firms. One of representative services of such personalized services is a mobi le widget service. In this studY. we identified seven antecedents affecting the quality of personalized mobile widget services and empirically investigated which antecedent has a significant effect 01 the quality of personalized mobile widget services. In addition we carried out empirical investigation into the effect of the quality of personalized mobile widget service on user satisfaction and trust. As a result of this research, we revealed that seven variables including information services affected components of personalized services, and usefulness and perceived benefit as components of personalized services affected user trust and satisfaction lor personalized services
평택지역 대기 중 먼지 입경별 잔류성유기오염물질 분포특성 연구
김동기(Dong-Gi Kim),우정식(Jung-Sik Woo),김용준(Yong-Jun Kim),정해은(Hye-Eun Jung),박주은(Ju-Eun Park),조덕희(Duck-Hee Cho),문희천(Hee-Chun Moon),오조교(Jo-Gyo Oh) 한국환경보건학회 2020 한국환경보건학회지 Vol.46 No.2
Objectives: The concentration distributions of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), dioxin-like polychlorinated biphenlys (dl-PCBs), and polycyclic aromatic hydrocarbons (PAHs) in fine particles were investigated to provide basic data on POP behavior and composition analysis. Methods: The concentrations of PCDD/Fs, dl-PCBs, and PAHs by particle size were evaluated for TSP, PM10, and PM2.5. Also, fine dust component analysis and factor analysis were performed to identify the source of PCDD/Fs. Results: The particle size distribution was found to account for 24.3% of >10 μm, 14.5% of 2.5-10 μm, and 61.2% of <2.5 μm. The average contributions of coarse particles (>2.5 μm) and fine particles (<2.5 μm) were PCDD/Fs 67%, dl-PCBs 66%, benzo (a) pyrene 83% and PAHs 84%, and the contributions of fine particles (<2.5 μm) were higher than coarse particles (>2.5 μm). However, the contributions of coarse particles increased in April to September with higher temperatures, while those of fine particles increased in February to March with lower temperatures. Conclusions: Low chlorinated (4Cl-5Cl) PCDD/Fs were more adsorbed compared to coarse particles due to the influence of pollutant migration from particulate to gas phase according to temperature rise, whereas high chlorinated (6Cl-8Cl) PCDD/Fs were more adsorbed compared to fine particles. PCDD/Fs sources were assessed to be major sources of emissions, such as incineration facilities and/or open burning.