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Video multicast over WLANs: Power saving and reliability perspectives
Shin, Yeonchul,Choi, Munhwan,Koo, Jonghoe,Choi, Sunghyun IEEE 2013 IEEE network Vol.27 No.2
<P>Video streaming service via multicast is one promising technology for multimedia services over wireless local area networks. Given that many portable devices are battery-powered while video quality relies on the reliable delivery of video traffic, video multicast frames need to be reliably delivered to power-saving stations. In this article, we study video multicast from the power saving and reliability perspectives. The IEEE 802.11 standard allows multicast receivers to enable power management while receiving multicast frames. However, from measurements with several commercial WLAN devices, we observe that many devices are not standards- compliant, thus severely degrading video multicast performance when multicast receivers are in the power saving mode. We identify various standards-non-compliant malfunctions of both access points and stations, and then categorize these malfunctions. Meanwhile, the legacy 802.11 standard is known to support only unreliable multicast service due to the lack of retransmissions. We present various reliable multicast schemes including application layer forward error correction and reliable multicast protocols defined in the emerging IEEE 802.11v and 802.11aa, and comparatively evaluate them via simulations.</P>
Weiping Sun,Okhwan Lee,Yeonchul Shin,Seongwon Kim,Changmok Yang,Hyoil Kim,Sunghyun Choi IEEE 2014 IEEE communications magazine Vol.52 No.11
<P>Wi-Fi has become an essential wireless technology in our daily lives, although the original intention of its introduction was to replace Ethernet cable. In this article, we outline the most remarkable features introduced during its ongoing technological evolution in terms of three major directions: throughput enhancement, longrange extension, and greater ease of use. By stitching these advanced features together, we also envision a promising future that Wi-Fi technology will bring us in terms of spectrum heterogeneity, seamless service provisioning, and possible relations with cellular networks.</P>
Song, Su-Min,Shin, Jong-Won,de Guzman, Jefferson V.,Kim, Jin,Yu, Hak-Sun,Jha, Bijay Kumar,Kong, Hyun-Hee,Hong, Yeonchul,Chung, Dong-Il Elsevier 2010 Experimental parasitology Vol.125 No.2
<P><B>Abstract</B></P><P><I>Paragonimus westermani</I> is a trematode parasite that causes inflammatory lung disease as well as systemic infections in carnivorous mammals. The interaction of the parasite with host cells and paired worms is initiated by adhesion and plays an important role in parasite proliferation and differentiation. In this study, we isolated a cDNA encoding a <I>P. westermani</I> fasciclin I domain-containing protein (Pwfas-I). The fasiclin-I domain is suggested to be involved in cell adhesion, migration, and differentiation. Immunohistochemical analysis of <I>P. westermani</I> adult worms with polyclonal anti-Pwfas-I serum revealed immunoreactivity in the egg shells and the cells lining the sub-tegumental layer of adult worm throughout the contact regions of the cyst wall and paired worms. Using cell adhesion and spreading assays, we showed that Pwfas-I supports cell adhesion and spreading. Furthermore, we determined that the ανβ5 integrin was a functional receptor for the Pwfas-I. Taken together, these results suggest that Pwfas-I may be functional for the modulation of cell adhesion via binding with ανβ5 integrin in the extracellular matrix of <I>Paragonimus</I>.</P>