http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Characterization of Silver Inkjet Overlap-printing through Cohesion and Adhesion
Sang?Ho Lee,Young?June Cho 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.1
We introduce an understanding of silver (Ag) inkjet overlap-printing characteristics from the viewpoints of cohesion between ink droplets and adhesion between an ink droplet and a surface. The printing characteristics were closely monitored by changing the surface energy to elucidate the effect of adhesion and cohesion on printing instability, such as droplet merging and line bulging. The surface energy of the substrate was changed through the hydrophilization of a hydrophobic fluorocarbon-coated surface. The surface energy and ink wettability of the prepared surfaces were characterized using sessile drop contact angle analysis, and printing instability was observed using an optical microscope after drop-on-demand inkjet printing with a 50% overlap in diameter of deposited singlet patterns. We found that the surface energy is not an appropriate indicator based on the experimental results of Ag ink printing on a hydrofluoric-treated silicon surface. The analytical approach using adhesion and cohesion was helpful in understanding the instability of the inkjet overlap-printing, as adhesion and cohesion represent the direct interfacial relationship between the Ag inks used and the substrate.
Shear-induced color transition of PDA (polydiacetylene) liposome in polymeric solutions
Lee, Sung-Sik,Chae, Eun-Hyuk,Ahn, Dong-June,Ahn, Kyung-Hyun,Yeo, Jong-Kee The Korean Society of Rheology 2007 Korea-Australia rheology journal Vol.19 No.1
The polydiacethylene (PDA) is known to change its color by mechanical shear. The shear-induced color transition has been reported with elastomer or film type of PDA. In this paper, we newly investigated the transition with liposome type of PDAs in polymeric solutions. The liposomes were dispersed in Poly(vinyl alcohol) 2% + Sodium borate 1%, Poly(vinyl alcohol) 15% and Hyaluronic acid 1% (PVA/B, PVA, HA). The shear stress was continuously imposed to each solution by stress control type rheometer with coni-cylinder fixture. The degree of color transition was quantified with the characteristic absorbance peak at 540 nm (blue) and 640 nm (red). As a result, PDA liposome in PVA/B solution changed the color from blue to red upon increasing the magnitude of shear (from 0 to 100 Pa) and the duration of shear-imposed time (from 0 to 5400 sec). Meanwhile, PDA liposome in HA or PVA solution did not noticeably change the color, even though the low shear viscosities of the solutions were kept almost constant. This color transition of PDA liposome is expected to measure the magnitude of shear, and to distinguish different responses of polymeric solutions to the applied shear.
Hybrid Power Combining Rectenna Array for Wide Incident Angle Coverage in RF Energy Transfer
Lee, Dong-Jin,Lee, Soo-Ji,Hwang, In-June,Lee, Wang-Sang,Yu, Jong-Won Professional Technical Group on Microwace Theory a 2017 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>This paper discusses a new design approach that uses hybrid power combining rectenna array in radio frequency (RF) energy transfer systems to receive more energy in a wide incident angle range. A beam-forming matrix and a dc power management network (PMN) are introduced to the hybrid power combining. The normalized dc output power of the proposed hybrid power combining array is compared to the conventional power combining methods with regard to the incident wave angle, and the average received dc power is also calculated and compared. To experimentally verify the proposed hybrid combining array performance, four suspended patch antennas are attached to RF energy receiving architecture. A 4 x 4 Butler matrix and quadrature hybrids are used for the beam-forming matrix in a hybrid power combining rectenna array. A reconfigurable voltage doubler rectifier with a dc PMN is used to convert RF energy to dc energy and delivers proper voltage to the load. The measured results of each component are presented. Moreover, an experimental verification using fabricated components for RF energy transfer is presented and the measured received dc output power of conventional and proposed structures is presented and compared.</P>
Characterization of Silver Inkjet Overlap-printing through Cohesion and Adhesion
Lee, Sang-Ho,Cho, Young-June The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.1
We introduce an understanding of silver (Ag) inkjet overlap-printing characteristics from the viewpoints of cohesion between ink droplets and adhesion between an ink droplet and a surface. The printing characteristics were closely monitored by changing the surface energy to elucidate the effect of adhesion and cohesion on printing instability, such as droplet merging and line bulging. The surface energy of the substrate was changed through the hydrophilization of a hydrophobic fluorocarbon-coated surface. The surface energy and ink wettability of the prepared surfaces were characterized using sessile drop contact angle analysis, and printing instability was observed using an optical microscope after drop-on-demand inkjet printing with a 50% overlap in diameter of deposited singlet patterns. We found that the surface energy is not an appropriate indicator based on the experimental results of Ag ink printing on a hydrofluoric-treated silicon surface. The analytical approach using adhesion and cohesion was helpful in understanding the instability of the inkjet overlap-printing, as adhesion and cohesion represent the direct interfacial relationship between the Ag inks used and the substrate.
Lee, Je-Hwan,Kim, Yoo-Jin,Sohn, Sang Kyun,Yoon, Sung-Soo,Kim, Hawk,Cheong, June-Won,Lee, Won-Sik,Lee, Gyeong-Won,Lim, Sung-Nam,Kim, Min Kyoung,Lee, Ho Sup,Kim, Hyeoung-Joon Elsevier 2017 Leukemia research Vol.60 No.-
<P><B>Abstract</B></P> <P>We retrospectively analyzed the results of hypomethylating therapy in 586 patients (azacitidine in 423 and decitabine in 163) with International Prognostic Scoring System (IPSS) lower-risk myelodysplastic syndrome (MDS). The patients were reclassified with newer scoring systems (revised IPSS [R-IPSS], revised WHO classification-based Prognostic Scoring System [R-WPSS], and Lower Risk Prognostic Scoring System [LR-PSS]), and 21.8–38.4% of patients had high or very high risk features by the newer scoring systems. Median overall survival (OS) was 27.3 months and newer scoring systems well stratified the patients in terms of OS (R-IPSS, <I>P</I> =0.001; R-WPSS, <I>P<</I> 0.001; LR-PSS, <I>P<I> <</I> </I> 0.001). Hematologic improvement (HI) was observed in 279 patients (47.6%). OS differed by the achievement of HI (39.4% vs. 36.2%, <I>P</I> =0.067). The differences were significant only in patients of intermediate or high risk group by LR-PSS (<I>P</I> =0.034) or R-IPSS (<I>P</I> =0.018). In summary, IPSS lower-risk MDS included a broad range of prognosis, and hypomethylating therapy induced HI in approximately half of the patients. Achievement of HI was associated with longer survival, especially in patients with intermediate or high risk features by newer scoring systems. Hypomethylating therapy seems to have potential benefits in IPSS lower-risk MDS.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Some IPSS lower-risk patients had high risk features by newer scoring systems. </LI> <LI> IPSS lower-risk patients were well stratified by newer systems for survivals. </LI> <LI> Hematologic improvement was observed in 48% after hypomethylating therapy. </LI> <LI> Achievement of hematologic improvement was associated with longer survival. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Electric Model of Li-Ion Polymer Battery for Motor Driving Circuit in Hybrid Electric Vehicle
Lee, June-Sang,Lee, Jae-Joong,Kim, Mi-Ro,Park, In-Jun,Kim, Jung-Gu,Lee, Ki-Sik,Nah, Wan-Soo The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.6
This paper presents an equivalent circuit model of a LIPB (Li-Ion Polymer battery) for Hybrid Electric Vehicles (HEVs). The proposed equivalent circuit can be used to predict the charging/discharging characteristics in time domain as well as the impedance characteristic analysis in frequency domain. Based on these features, a one-cell model is established as a function of Depth of Discharge (DoD), and a 48-cell model for a battery pack was also established. It was confirmed by experiment that the proposed model predict the discharging and impedance (AC) characteristics quite accurately at different constant current levels. To check the usefulness of the proposed circuit, the model was used to simulate a motor driving circuit with an Insulated Gate Bipolar Transistor (IGBT) inverter and Brushless DC (BLDC) motor, and it is confirmed that the model can calculate the battery voltage fluctuation in time domain at different DoDs.