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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 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.
( Longzhe Han ),( Sungjun Park ),( Seung-seok Kang ),( Hoh Peter In ) 한국인터넷정보학회 2010 KSII Transactions on Internet and Information Syst Vol.4 No.3
Forward Error Correction (FEC) techniques have been adopted to overcome packet losses and to improve the quality of video delivery. The efficiency of the FEC has been significantly compromised, however, due to the characteristics of the wireless channel such as burst packet loss, channel fluctuation and lack of Quality of Service (QoS) support. We propose herein an Adaptive Cross-layer FEC mechanism (ACFEC) to enhance the quality of video streaming over 802.11 WLANs. Under the conventional approaches, FEC functions are implemented on the application layer, and required feedback information to calculate redundancy rates. Our proposed ACFEC mechanism, however, leverages the functionalities of different network layers. The Automatic Repeat reQuest (ARQ) function on the Media Access Control (MAC) layer can detect packet losses. Through cooperation with the User Datagram Protocol (UDP), the redundancy rates are adaptively controlled based on the packet loss information. The experiment results demonstrate that the ACFEC mechanism is able to adaptively adjust and control the redundancy rates and, thereby, to overcome both of temporary and persistent channel fluctuations. Consequently, the proposed mechanism, under various network conditions, performs better in recovery than the conventional methods, while generating a much less volume of redundant traffic.
QoS 보장을 고려한 실시간 CORBA 상의 CgR과 객체지향 명명 서비스
홍성준(Sungjune Hong),김영재(Youngjae Kim),권민순(Minsoon Kweon),한선영(Sunyoung Han) 한국정보과학회 1998 정보과학회 컴퓨팅의 실제 논문지 Vol.4 No.4
본 논문은 QoS 보장과 효과적인 명명성(naming)을 지원하는 실시간 CORBA상의 CgR/명명 서비스의 설계 및 개발에 대한 것이다. RSVP와 CORBA 명명 서비스를 이용한 CgR/명명 서비스는 2 가지 특성을 가진다. 첫째는 TAO의 ORB와 RSVP의 통합을 꾀함으로써, CORBA에 QoS 보장 달성 메카니즘을 제공하는 것이고, 둘째는 CORBA 명명 서비스의 위치투명성을 이용함으로써 실시간 CORBA 상의 CgR에 효과적인 명명성을 제공하는 것이다. This paper describes a design and development of CgR/naming service on Real-time CORBA, which is suited for multimedia applications on distributed environment. CgR/naming service using RSVP and CORBA naming service has two key features, QoS enforcement and naming. Integration of RSVP with TAO's ORB can provide QoS enforcement for CORBA. CORBA naming service's location transparency provides an efficient naming for CgR on Real-Time CORBA.
Im, Han Seo,Park, Seon Ha,Ha, Hyo Jeong,Lee, Sumin,Heo, Sungjun,Im, Sang Won,Nam, Ki Tae,Lim, Sung Yul The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.1
The preparation of low-cost, simple, and scalable electrodes is crucial for the commercialization of water electrolyzers for H<sub>2</sub> production. Herein, we demonstrate the fabrication of cathodes through Mo-modified Zn phosphating of Ni foam (NiF) for water electrolysis, which has been largely utilized in surface coating industry. In situ growth of electrocatalytically active layers in the hydrogen evolution reaction (HER) was occurred after 1 min of phosphating to form ZnNiMoP<sub>i</sub>, and subsequent thermal treatment and electrochemical activation resulted in the formation of ZnNiMoPO<sub>x</sub>H<sub>y</sub>. ZnNiMoPO<sub>x</sub>H<sub>y</sub> exhibited superior HER performance than NiF, primarily because of the increased electrochemically active surface area of ZnNiMoPO<sub>x</sub>H<sub>y</sub> compared to that of bare NiF. Although further investigations to improve the intrinsic electrochemical activity toward the HER and detailed mechanistic studies are required, these results suggest that phosphating is a promising coating method and will possibly advance the fabrication procedure of electrodes for water electrolyzers with better practical applications.