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대유행 인플루엔자(H1N1 2009) 원내 노출자 관리결과
이경원,권오미,이동숙,박은숙,김창오,한상훈,김기환,이주현,하은진,이경원 대한의료관련감염관리학회 2010 의료관련감염관리 Vol.15 No.2
Background: This study is aimed at describing the outcomes of the management of the patients, caregivers, and healthcare workers (HCWs) who are exposed to the pandemic influenza (H1N1 2009) virus and at evaluating the adequacy in exposure management and infection control. Methods: From July 2009 to January 2010, for 7 a month period, we managed patients and healthcare workers without any respiratory protective devices, who came within 1 m distance of H1N1-positive individuals for more than 1h and performed a 1-week follow-up. Results: The total of 157 cases with exposure to pandemic influenza (H1N1 2009) virus and exposed individuals of 907 were reported. Of the exposed individuals who were under management, 15 were confirmed to be infected with the infection rate being 1.7%. The confirmed individuals did not have a secondary infection after the exposure. Rates of infection of the exposed patients and healthcare workers were 1.8% and 1.6%, respectively, and these figures were not statistically significant. Conclusion: The exposure management results at the hospital revealed that the infection had spread by contact with individuals who were positive for the infection. The high incidence of early exposure to the virus warrants the need to ensure the use of protective equipment and the adoption of assertive teaching methods that have long lasting effects.
이경원 서울市立大學校 1983 論文集 Vol.17 No.-
액체헬리움Ⅱ의 분산관계를 근사계산법으로 계산하며 그 결과와 실험결과를 비교하여 두 결과가 서로 잘 맞도록 경수를 조정하였다. 그 결과 다른 실험들과 잘 맞고, 종래와 다른 형태의 분산관계를 얻었다.
李京遠 충주대 2001 한국교통대학교 논문집 Vol.36 No.2
키토산을 약산에 용해시켜서 H+이온에 의한 가수분해를 진행시킨 뒤 동결 건조시켜서 수용성 키토산을 제조하였다.키토산의 분자량은 초산농도증가와 온도가 증가할수록 점점 감소하는데 이는 가수분해가 활성화되기 때문임을 알 수 있었다.또한 동결건조시에는 수분제거와 함께 초산의 증발도 함께 진행되어 키토산의 pH에 영향을 미침을 알았다. The chitosan, which performed the process of freeze drying after dissolution in weak acid, was retarded the hydrolysis caused by proton ion and showed water soluble capacity due to the salt form of chitosan structure.The molecular weight of chitosan was decreased with the increase of acetic acid and the increase of temperature.It can be seen that the molecular weight of chitosan was influenced by the activation of hydrolysis.During freeze drying process, the pH of chitosan was also affected by the volatilization of acetic acid with the elimination of water.
Holography에 의한 Loudspeaker Cone의 振動에 관한 考察
李慶源,朴鍾允,林鍾洙,朴興秀 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.1
Optical holographic interferometry is used to study the forced vibrational cone behaviour at some frequencies and photographs of resultant hologragm images are included. The entire cone vibrates almost uniformly in the low frequency region. Above certain frequency both transverse and longitudinal waves are coupled and together determine the vibration patterns. The coupling between longitudinal and bending waves gives rise to an antiresonance that the transverse amplitude become large. Bending waves only occur above the frequency at which this antiresonance occur. As the frequency increases, the resonance effect gradually progresses from the outer edge to the inner edge.