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저손실 첨가제가 NiCuZn Ferrite 특성에 미치는 영향 연구
김환철,고재귀,Kim, Hwan-Chul,Koh, Jae-Gui 한국재료학회 2003 한국재료학회지 Vol.13 No.8
The electromagnetic properties and microstructures of the ferrites based on ($Ni_{0.2}$ $Cu_{0.2}$ $Zn_{0.6}$)$_{1.085}$($Fe_2$$O_3$)$_{0.915}$ were investigated by changing the amount of additive SnO$_2$and CaO and the sintering temperatures. Addition of $SnO_2$caused pores in the specimen. There was no variation of grain size by changing the amount of additives. Total loss was reduced when ($Ni_{0.2} $Cu_{0.2}$ $Zn_{ 0.6}$)$_{1.085}$ ($Fe_2$$O_3$)$_{0.915}$ composition was sintered at $1150^{\circ}C$ rather than $1300^{\circ}C$. Addition of CaO was useful to reduce the total loss because it increased the sintering density. The lowest total loss was obtained when 0.06 wt% $SnO_2$and 0.4 wt% CaO were added at the same time.
Chlorinated Polyvinylchloride가 혼합된 Polyvinylchloride사의 물리적 및 열적 특성
김환철,김종천,성백만,Kim Hwan Chul,Kim Jong Chun,Sung Baek Man 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.6
Thermal and mechanical properties of CPVC(chlorinated PVC) are better than those of PVC. CPVC was blended with PVC to increase properties of PVC fiber. Blending ratio of CPVC was changed and thermal, rheological and mechanical properties were investigated in this study. Thermal stability and melt viscosity increased with increase in CPVC content. Fiber was spun by melt spinning method and drawn using heat plate. Tenacity increased and elongation decreased with increase in CPVC content. Heat shrinkage decreased with increase in CPVC content and heat treating temperature. Onset temperature of DSC endotherm peak corresponded to the treated heat temperature.
김환철 ( Hwan Cheol Kim ),임종한 ( Jong Han Leem ) 대한천식알레르기학회 2010 천식 및 알레르기 Vol.30 No.1
The prevalence and incidence of allergic disease have increased during the last decade in most industrialized and developing countries in the world. Recent human and animal laboratory-based studies have proposed that persistent exposure to traffic-related pollution, especially particulate matter <10 μg in diameter (PM10) from motor vehicles can enhance allergic inflammation and induce the development of allergic immune responses. In particular, the association between traffic-related pollution and asthma has been observed in many epidemiologic studies. Traffic- related pollution has been estimated by developing new indicators, such as the distance to main roads, road lengths within certain buffer, traffic counts, NO2 and PM10 concentration calculated by land use regression (LUR) model. Even though there still remain uncertainty and the data gap between traffic-related pollution and allergic rhinitis or atopic dermatitis, some studies have reported significant associations between them. Changes by traffic-related pollutants are regarded as biomolecular indicators for the susceptible population of asthma and other allergic diseases. Long-term studies, including environmental exposure in early life and gene-environment interactions, are needed to prevent and decrease the development of asthma and other allergic diseases. (Korean J Asthma Allergy Clin Immunol 2010;30:5-11)