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Yu, Jae-Woong,Kim, Jai Kyeong,Kim, Dong Young,Kim, Chulhee,Song, Nam Woong,Kim, Dongho Elsevier 2006 Current Applied Physics Vol.6 No.1
<P><B>Abstract</B></P><P>The energy transfer process upon photoexcitation in binary polymer blends with different donor/acceptor pairs were investigated with the aid of the steady-state and time-resolved photoluminescence methods. The observed differences in the energy transfer efficiency are not fully explained by the Förster radius, deduced from the spectral overlap calculation. The order of energy transfer efficiencies for different donor/acceptor pairs does not follow the sequence of Förster radius, particularly for the acceptors having relatively long PL lifetimes. Hence, an alternative simple model is proposed to account for the order of energy transfer efficiency, which is to include the effect of the acceptor PL lifetime, specifically in the presence of excess donor. Such is the case with usual polymer LED devices.</P>
Jae-Woong Yu,Jai Kyeong Kim,Dong Young Kim,Chulhee Kim,Nam Woong Song,Dongho Kim 한국물리학회 2006 Current Applied Physics Vol.6 No.1
The energy transfer process upon photoexcitation in binary polymer blends with dierent donor/acceptor pairs were investigatedwith the aid of the steady-state and time-resolved photoluminescence methods. The observed dierences in the energy transfer e-ciency are not fully explained by the Fo¨rster radius, deduced from the spectral overlap calculation. The order of energy transfer¨rster radius, particularly for the acceptors havingrelatively long PL lifetimes. Hence, an alternative simple model is proposed to account for the order of energy transfer eciency,which is to include the eect of the acceptor PL lifetime, specically in the presence of excess donor. Such is the case with usualpolymer LED devices.
Yu, Hak Ki,Kim, Woong-Kwon,Park, Eung Chul,Kim, Jae Sung,Koo, Bon-Woong,Kim, Young-Woon,Ryu, Jae Hwa,Lee, Jong-Lam American Chemical Society 2011 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.115 No.36
<P>A number of oxygen vacancies were found in the MgO film when a nanoscale-metal embedded MgO film (MgO/nanoscale metal film/MgO) was exposed to a pulsed KrF excimer laser. This was due to the interfacial reaction between embedding nanoscale metal and MgO film. In a case of Nb embedding metal, the Nb<SUB>2</SUB>O<SUB>5</SUB> crystallites were evidenced to proceed the reaction at the MgO/Nb interface; 5MgO + 2Nb → Nb<SUB>2</SUB>O<SUB>5</SUB> + 5Mg + 5V<SUB>O</SUB><SUP>··</SUP>. The oxygen vacancies formed the F centers in the MgO bandgap, resulting in high cathodoluminescence intensity at the 431 and 526 nm region, corresponding to F<SUP>+</SUP> and F centers. The F centers in MgO played a role in increasing secondary electron emission coefficient (γ). As several kinds of nanoscale metals for creating F centers (Cr, Ti, V, In, Ta, and Nb) were embedded into MgO film, the γ values were found to be inversely linear with the Δ<I>G</I><SUB>f</SUB> for the formation of metal oxides. The Nb embedded MgO film showed the highest γ value of ∼0.232 compared with normal MgO film (0.034).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2011/jpccck.2011.115.issue-36/jp205759s/production/images/medium/jp-2011-05759s_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp205759s'>ACS Electronic Supporting Info</A></P>
Pulmonary Toxicity in Rats After 5-Day Repeated Inhalation Exposure to Graphene Nanopowder
Jae Hoon Shin(신재훈),Sung Gu Han,Jin Kwon Jim,Boo Wook Kim,Joo Hwan hwang,Jong Seong Lee,Ji Hyun Lee,JinEe Baek,Tae Gyu Kim,KeunSoo Kim,Heon Sang Lee,Nam Woong Song,Kangho Ahn,Il Je Yu 대한직업환경의학회 2015 대한직업환경의학회 학술대회 논문집 Vol.2015 No.11
( Jae Hyoung Park ),( Do Sun Lim ),( Soon Jun Hong ),( Cheol Woong Yu ),( Hyung Joon Joo ),( Je Young Cho ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Central blood pressure is independent predictors of cardiovascular risk. We investigated the acute effects of marathon and half marathon on central and peripheral blood pressures. Methods: We studied 17 trained male amateur marathoners (mean age; 52.3±8.9 years). We measured augmentation index (Alx), flow mediated dilation (FMD), brachial ankle pulse wave velocity (ba-PWV), central and brachial blood pressure before and immediate after the Seoul international marathon (18th March 2012). And, 1 month later, we measured them again after half marathon. Alx, central and brachial blood pressure were measured using HEM-9000AI (Omron Healthcare Co., Ltd., Kyoto, Japan). Repeated measured ANOVA and post-hoc Bonferroni correction were used to compare the difference between marathon and half marathon for Alx and blood pressure. Results: There was no significant change of brachial systolic and diastolic blood pressure before and after marathon. (p=0.369, 0.903, respectively) However, there was a significant reduction of brachial systolic blood pressure after half marathon (127.9±17.1 to 115.1±10.3 mmHg; p=0.004). Both marathon and half marathon caused a significant reduction of central blood pressure (p=0.019, p<0.001, respectively). However, there is no significant difference between marathon and half marathon in central blood pressure. There was no significant change of FMD and ba-PWV in marathon and half marathon. Conclusions: The present study found a reduction in central systolic blood pressure in marathon and half marathon. There was significant reduction in brachial systolic blood pressure in half marathon, but, not in marathon. Both marathon and half marathon had acute beneficial effects on cardiovascular system contrary to our concerns. However, half marathon was better than marathon in post-exercise hypotension.
Device characterization and Fabrication Issues for Ferroelectric Gate Field Effect Transistor Device
Yu, Byoung-Gon,You, In-Kyu,Lee, Won-Jae,Ryu, Sang-Ouk,Kim, Kwi-Dong,Yoon, Sung-Min,Cho, Seong-Mok,Lee, Nam-Yeal,Shin, Woong-Chul The Institute of Electronics and Information Engin 2002 Journal of semiconductor technology and science Vol.2 No.3
Metal-Ferroelectric- Insulator- Silicon (MFIS) structured field effect transistor (FET) device was fabricated and characterized. Important issues to realize ferroelectric gate field effect transistor device were summarized in three sections. The choice of interlayer dielectric was made in the consideration of device functionality and chemical reaction between ferroelectric materials and silicon surface during fabrication process. Also, various ferroelectric thin film materials were taken into account to meet desired memory window and process compatibility. Finally, MFIS structured FET device was fabricated and important characteristics were discussed. For feasible integration of current device as random access memory array cell address schemes were also suggested.
SEASONAL VARIABILITY OF WATER BALANCE IN THE YELLOW SEA
Jae Hak Lee,이흥재,Byoung Woong An,Yu Xiang Tang 한국해안해양공학회 1999 학술강연회 발표논문초록집 Vol.1 No.1
We analyze the CTD data obtained in the Yellow Sea through a Korea-China joint project during 1996-1998. Most of water masses analyzed here show that the seasonal variation is dominant. It is found that the low salinity core waters are formed in the southern surface layer in mid summer and their seasonal distribution exhibit a well posed annual cycle. Overall distribution patterns indicate that the low salinity core waters drift like a single body to adjust the seasonal basin-scale pressure fields, implying an eddy-like system. Another founding is that the temporal intermediate water characterized by its temperature minimum appears in the region of 50 m depth in the western Yellow Sea in spring. This water might be the remnants of cold waters formed during the winter season and the temperature minimum core appears as a result of different tidal mixing. Summertime data indicate that warm and saline waters provided from the southeast into the southern Yellow Sea in winter are isolated in the bottom layer of the region in summer, which modify continuously. In the future it is very necessary to study water masses in the bottom layer in summer to clarify the variation of the Yellow Sea Warm Current.