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윤영복,박병근,정동혁 圓光大學校 附設 體力科學硏究所 2005 體力科學硏究 Vol.28 No.-
The purpose of this research is to examine the effect of the aerobic exercise duration on cardiorespiratory function and blood lipids. Total 14 divided into two groups 7, for the control group and the other for the experimental group 7. The subjects of experimental group had 8 weeks aerobic program in the given intensity, during which the changes in cardorespiratory function to body fat and blood lipids were measured three times, at each end of 8th, 8th week. The research is concluded as follows. 1. After 8 Weeks, aerobic exercise brought the decrease of maximum HR with statistically significant(p<.05). 2. After 8 Weeks, aerobic exercise brought the increase of VE with statistically significant(p<.05). 3. After 8 weeks, aerobic exercise reduced TG, LDL-C and T-C with statistically significant(p<.05). In conclusion, aerobic exercise helps overweight women to reduce their weights and the amount of fat and to get rid of elements that cause various geriatric diseases. Therefore, overweight women as well as common adults are advised to take aerobic exercises.
Synthesis and Optical Properties of Cycloolefin Copolymers for Plastic Substrates
Yoon, Keun-byoung,Choi, Jin Sik,Lee, Dong-ho,Hur, Youngjune,Noh, Seok Kyun TaylorFrancis 2006 MOLECULAR CRYSTALS AND LIQUID CRYSTALS - Vol.459 No.1
<P>Cycloolefin copolymers comprise a new class of polymer materials showing properties, of high glass transition temperature, optical clarity, low shrinkage, low moisture absorption and low birefringence. There are several types of cyclic olefin copolymers based on different type of cyclic monomers and polymerization methods. In ethylene/norbornene (E/NB) copolymerization, <I>i</I>Pr(Cp)(Flu)ZrCl<SUB>2</SUB> catalyst exhibited more activity than Cp<SUB>2</SUB>ZrCl<SUB>2</SUB> and <I>rac</I>-Et(Ind)<SUB>2</SUB>ZrCl<SUB>2</SUB> catalysts. By the incorporation of Norbornene in copolymer, the glass transition temperature (Tg) of copolymer became higher. The Tg of copolymer increased up to 190°C. The transmission of copolymers was above 90% over 300 ∼ 900 nm. The RI of ethylene/tetracyclododecene (E/TCD) copolymer was higher than that of E/NB copolymer. The RI of E/NB copolymer could not changed increasing NB contents, however, the RI of E/TCD copolymer increased with increasing of TCD contents. The E/NB copolymer has very low birefringence and that film has very smooth surface.</P>
Yoon, Keun-byoung,Jeong, Seonju,Kwak, Giseop Hu@thig & Wepf 2007 Macromolecular Rapid Communications Vol.28 No.11
<P>This paper describes that three-dimensional (3-D) fluorescence image patterning of a network aliphatic polyester was successfully conducted by microtransfer molding (µTM) of the prepolymer and subsequent thermal treatment. A highly sticky, aliphatic ester prepolymer, containing a malonate moiety in the main chain, was obtained by a two-step reaction, quantitatively. The 3-D micropattern of the prepolymer was fabricated by µTM using polydimethylsiloxane (PDMS) as elastomeric mold. The patterns showed a clear shape without any residual layer. When the molded prepolymer was thermally treated, the patterns exhibited very distinct fluorescence images in a full color range of sky-blue, yellowish green and red regions when excited at wavelengths of 325, 488, and 580 nm, respectively.</P><P> <img src='wiley_img/10221336-2007-28-11-MARC200700134-gra001.gif' alt='wiley_img/10221336-2007-28-11-MARC200700134-gra001'> </P>
Low-Loss Multimode Waveguides Using Organic-Inorganic Hybrid Materials
Yoon, Keun-Byoung The Polymer Society of Korea 2004 Macromolecular Research Vol.12 No.3
Multimode channel waveguides were fabricated using a direct UV patterning technology from thick films deposited by the one-step dip-coating of an organic/inorganic hybrid material (ORMOCER(equation omitted). The core size of the covered ridge waveguide was 43${\times}$51 $\mu\textrm{m}$$^2$; the waveguides can be readily prepared for multimode applications by direct UV patterning. The waveguides exhibited smooth surface profiles and a low optical loss of 0.07 ㏈/cm at the most important wavelength (850nm) used for optical interconnects.