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Salicylic Acid-Based Organic Dyes Acting as the Photosensitizer for Solar Cells
Hong, Sungjun,Park, Jae-Hyeong,Han, Ah-Reum,Ko, Kwan-Woo,Eom, Jin Hee,Namgoong, Sung Keon,Lo, Alvie S. V.,Gordon, Keith C.,Yoon, Sungho,Han, Chi-Hwan American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>A D-pi-A metal-free organic dye, featuring salicylic acid as a novel acceptor/anchoring unit, has been designed, synthesized and applied to dye-sensitized solar cell. The detailed photophysical, electrochemical, photovoltaic and sensitizing properties of the organic dye were investigated, in addition to the computational studies of the dye and dye-(TiO2)(6) system. A solar cell device using this new organic dye as a sensitizer produced a solar to electric power conversion efficiency (PCE) of 3.49% (J(SC) = 6.69 mAcm(-2), V-OC 0.74 V and ff = 0.70) under 100 mWcm(-2) simulated AM 1.5 G solar irradiation, demonstrating that the salicylic acid-based organic dye is a suitable alternative to currently used organometallic dyes.</P>
A Proposal of Shuffle Graph Convolutional Network for Skeleton-based Action Recognition
Sungjun Jang(장성준),Han Byeol Bae(배한별),HeanSung Lee(이현성),Sangyoun Lee(이상윤) 한국정보전자통신기술학회 2021 한국정보전자통신기술학회논문지 Vol.14 No.4
Skeleton-based action recognition has attracted considerable attention in human action recognition. Recent methods for skeleton-based action recognition employ spatiotemporal graph convolutional networks (GCNs) and have remarkable performance. However, most of them have heavy computational complexity for robust action recognition. To solve this problem, we propose a shuffle graph convolutional network (SGCN) which is a lightweight graph convolutional network using pointwise group convolution rather than pointwise convolution to reduce computational cost. Our SGCN is composed of spatial and temporal GCN. The spatial shuffle GCN contains pointwise group convolution and part shuffle module which enhances local and global information between correlated joints. In addition, the temporal shuffle GCN contains depthwise convolution to maintain a large receptive field. Our model achieves comparable performance with lowest computational cost and exceeds the performance of baseline at 0.3% and 1.2% on NTU RGB+D and NTU RGB+D 120 datasets, respectively.
Han, Jusung,Kim, Kihyun,Kim, Junghwan,Kim, Sungjun,Choi, So-Won,Lee, Hyunhee,Kim, Jin-joo,Kim, Tae-Ho,Sung, Yung-Eun,Lee, Jong-Chan Elsevier 2019 Journal of membrane science Vol.579 No.-
<P><B>Abstract</B></P> <P>End-group cross-linked sulfonated poly(arylene ether sulfone) (SPAES) membranes were prepared using thiol capped SPAES (SH-SPAES) with different amounts of vinyl polysulfone (VPSf) as a polymeric cross-linker. The cross-linked membranes showed remarkably improved physicochemical stabilities compared to the corresponding linear SPAES membrane. Although the proton conductivity of the SPAES membrane composed of SPAES with the degree of sulfonation (DS) as 70 mol% could not be measured due to its low physical stability under the measurement condition, those of the cross-linked membranes were repeatedly evaluated due to the enhanced stability through the formation of cross-linked structures. The obtained proton conductivity values from cross-linked membranes are larger than those of the linear SPAES membrane which composed of SPAES with DS of 50 mol% having the ion exchange capacity (IEC) similar to that of the cross-linked membranes, especially at relative low humidity conditions. Furthermore, the fuel cell performance of the membrane electrode assembly (MEA) prepared with the cross-linked membrane, showing the optimized physicochemical stabilities and proton conductivity exhibited a maximum power density of 692 mW cm<SUP>−2</SUP>, which was larger than that with Nafion 212 (603 mW cm<SUP>−2</SUP>) at 80 °C under fully humidified H<SUB>2</SUB>/Air condition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thiol group capped highly sulfonated poly(arylene ether sulfone) and vinyl group containing poly sulfone were synthesized. </LI> <LI> End group cross-linked membranes were prepared by thiol-ene click reaction using polymeric cross-linker. </LI> <LI> Excellent physicochemical stability of end group cross-linked membranes. </LI> <LI> High proton conductivity of end group cross-linked membranes in low humidity condition. </LI> <LI> Outstanding cell performance of MEA prepared with end group cross-linked membrane. </LI> </UL> </P>
A Study on the Improvement of Natural Regeneration DPF Regeneration for Large-Scale Diesel Vehicles
Sungjun Lee(이성준),Geomseung Han(한검승),Heung-sik Lee(이흥식),Sungyong Ha(하성용) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
The DPF attachment project is currently being promoted by the Special Act on the Improvement of the Atmospheric Environment in the Atmospheric Management Area, and the DPF attachment of natural and complex regeneration methods is being implemented. In addition, the PM-NOx reduction device attachment project is being implemented in the second basic plan for air environment management in the metropolitan area. The PM-NOx reduction device attachment project is a diesel vehicle with an engine displacement of 6000cc or more below the EURO3 emission standard manufactured before 2008, and its target is very limited. As a result of the verification through the analysis of the cause of inadequate exhaust gas in the driving vehicle inspection, it was investigated that the cause of DPF abnormality caused by the accumulation of ash due to the failure of DPF regeneration in vehicles equipped with natural regeneration DPF applied to EURO4,5 occupied a large part. Accordingly, in the DPF attachment project, the natural regeneration method DPF attachment was abolished, the complex regeneration method DPF only attached, and the PM-NOx reduction device attachment project was expanded and promoted to promote the reduction of fine dust and the global atmosphere. It will have a good effect not only on the improvement effect but also on the extension of human life expectancy.