The Experts below are selected from a list of 34338 Experts worldwide ranked by ideXlab platform
Yajun Wang - One of the best experts on this subject based on the ideXlab platform.
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stable radical cation salt initiated n h insertion and related proton Transfer Delay three component reaction
Tetrahedron Letters, 2016Co-Authors: Congde Huo, Haisheng Xie, Caixia Yang, Jie Dong, Yajun WangAbstract:Abstract The N–H insertion reaction forms the single addition product exclusively, and does not require slow addition of the diazo component. More importantly, we present the reaction of anilines with both diazoacetates and azodicarboxylates in the presence of catalytic amounts of triarylaminium salt giving the corresponding complex unsymmetrical aminals in high yields. This is the first example of stable radical cation salt promoted proton-Transfer-Delay three-component reaction.
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Stable radical cation salt initiated N–H insertion and related proton-Transfer-Delay three-component reaction
Tetrahedron Letters, 2016Co-Authors: Congde Huo, Haisheng Xie, Caixia Yang, Jie Dong, Yajun WangAbstract:Abstract The N–H insertion reaction forms the single addition product exclusively, and does not require slow addition of the diazo component. More importantly, we present the reaction of anilines with both diazoacetates and azodicarboxylates in the presence of catalytic amounts of triarylaminium salt giving the corresponding complex unsymmetrical aminals in high yields. This is the first example of stable radical cation salt promoted proton-Transfer-Delay three-component reaction.
Congde Huo - One of the best experts on this subject based on the ideXlab platform.
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stable radical cation salt initiated n h insertion and related proton Transfer Delay three component reaction
Tetrahedron Letters, 2016Co-Authors: Congde Huo, Haisheng Xie, Caixia Yang, Jie Dong, Yajun WangAbstract:Abstract The N–H insertion reaction forms the single addition product exclusively, and does not require slow addition of the diazo component. More importantly, we present the reaction of anilines with both diazoacetates and azodicarboxylates in the presence of catalytic amounts of triarylaminium salt giving the corresponding complex unsymmetrical aminals in high yields. This is the first example of stable radical cation salt promoted proton-Transfer-Delay three-component reaction.
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Stable radical cation salt initiated N–H insertion and related proton-Transfer-Delay three-component reaction
Tetrahedron Letters, 2016Co-Authors: Congde Huo, Haisheng Xie, Caixia Yang, Jie Dong, Yajun WangAbstract:Abstract The N–H insertion reaction forms the single addition product exclusively, and does not require slow addition of the diazo component. More importantly, we present the reaction of anilines with both diazoacetates and azodicarboxylates in the presence of catalytic amounts of triarylaminium salt giving the corresponding complex unsymmetrical aminals in high yields. This is the first example of stable radical cation salt promoted proton-Transfer-Delay three-component reaction.
Naoto Kadowaki - One of the best experts on this subject based on the ideXlab platform.
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packet Transfer Delay minimization by network wide equalization of unbalanced traffic load in multi layered satellite networks
Vehicular Technology Conference, 2013Co-Authors: Yuichi Kawamoto, Hiroki Nishiyama, Nei Kato, Naoko Yoshimura, Naoto KadowakiAbstract:Multi-Layered Satellite Networks (MLSNs) have many advantages such as extensive coverage, lower Delay performance, and disaster resistance. Moreover, the networks permit load distribution by bypassing traffic efficiently from lower layers to upper layers. In the future, the MLSNs should play an important role to provide global communication services. However, sometimes traffic congestion happens in these networks since the distribution of users is unbalanced heavily depending on geographical restrictions, which causes bad effects on the networks such as increasing Delay. Therefore, we focus on network design to avoid traffic congestion. There are many constitution elements to design these networks. One of the most significant elements is the altitude of satellites because it affects propagation distance and number of links between layers in MLSNs, and thus the packet Transfer Delay of the networks. Therefore, we analyze the relationship between the altitude of satellites and the packet Transfer Delay with network-wide equalization. Furthermore, the existence of the optimal altitude of satellites is denoted in this paper. Our analyses are validated by simulation experiments.
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VTC Spring - Packet Transfer Delay Minimization by Network-Wide Equalization of Unbalanced Traffic Load in Multi-Layered Satellite Networks
2013 IEEE 77th Vehicular Technology Conference (VTC Spring), 2013Co-Authors: Yuichi Kawamoto, Hiroki Nishiyama, Nei Kato, Naoko Yoshimura, Naoto KadowakiAbstract:Multi-Layered Satellite Networks (MLSNs) have many advantages such as extensive coverage, lower Delay performance, and disaster resistance. Moreover, the networks permit load distribution by bypassing traffic efficiently from lower layers to upper layers. In the future, the MLSNs should play an important role to provide global communication services. However, sometimes traffic congestion happens in these networks since the distribution of users is unbalanced heavily depending on geographical restrictions, which causes bad effects on the networks such as increasing Delay. Therefore, we focus on network design to avoid traffic congestion. There are many constitution elements to design these networks. One of the most significant elements is the altitude of satellites because it affects propagation distance and number of links between layers in MLSNs, and thus the packet Transfer Delay of the networks. Therefore, we analyze the relationship between the altitude of satellites and the packet Transfer Delay with network-wide equalization. Furthermore, the existence of the optimal altitude of satellites is denoted in this paper. Our analyses are validated by simulation experiments.
Hideki Tode - One of the best experts on this subject based on the ideXlab platform.
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APSITT - A study on power saving using RTS/CTS handshake and burst transmission in wireless LAN
2015 10th Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT), 2015Co-Authors: Kohei Omori, Yosuke Tanigawa, Hideki TodeAbstract:Recently, buttery-powered portable devices, which can use wireless LAN (WLAN), such as smart phones and tablet computers, are increasing. However, these devices consume more energy when using WLAN interfaces, and the battery lifetime is shorten. In order to reduce the power consumption of wireless stations, IEEE 802.11 specifies PSM (Power Saving Mode). However, PSM cannot save the energy optimally and it increases the Transfer Delay of packets severely. In this paper, to reduce the power consumption and suppress the Transfer Delay, we propose a power saving method using RTS/CTS handshake and burst transmission. Wireless stations save energy by sleeping for NAV (Network Allocation Vector) duration. In addition, we extend NAV duration with burst transmission. The number of packets transmitted per burst is decided so that the acceptable Transfer Delay of each packet is preserved. Finally, we show the effectiveness of the proposed method by computer simulation.
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GLOBECOM - Delay-Sensitive Retransmission Method Based on Network Coding in IEEE 802.11 Wireless LANs
2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010Co-Authors: Yosuke Tanigawa, Hideki TodeAbstract:Recently, network coding (NC) has been popularly applied to wireless networks in order to improve channel utilization. In wireless LANs, when NC is applied to packet retransmission, a base station can simultaneously retransmit multiple packets destined to different wireless stations for a single retransmission trial. On the other hand, NC creates additional packet Delay at both base station and wireless stations, and hence, packet Transfer Delay may increase seriously. However, existing NC-based retransmission methods do not consider this additional Delay explicitly. In addition, when the number of flows is small, NC exhibits less benefits because the chances of NC-based retransmission are highly reduced. Therefore, in this paper, we propose a novel NC-based retransmission method in order to improve packet Transfer Delay and jitter of received packets. Moreover, to achieve further improvement of Delay, jitter and retransmission efficiency, we propose a retransmission method in which NC-based retransmission cooperates with the typical ARQ method. We overcome the disadvantage of NC-based retransmission by combining with ARQ cooperatively. Finally, we show the effectiveness of the proposed methods by extensive computer simulation.
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Delay-Sensitive Retransmission Method Based on Network Coding in Wireless LANs
IEICE Transactions on Communications, 2010Co-Authors: Yosuke Tanigawa, Hideki TodeAbstract:Recently, network coding (NC) has been popularly applied to wireless networks in order to improve scarce wireless capacity. In wireless LANs, NC can be applied to packet retransmission, and a base station can simultaneously retransmit multiple packets destined to different wireless stations by a single retransmission trial. On the other hand, NC creates additional packet Delay at both base station and wireless stations, and hence, packet Transfer Delay may increase seriously. However, existing NC-based retransmission methods do not consider this additional Delay explicitly. In addition, when the number of flows is small, NC exhibits less benefit because the chances of NC-based retransmission are highly reduced. Therefore, in this paper, we propose a novel NC-based retransmission method in order to improve packet Transfer Delay and jitter of received packets. Moreover, to achieve further improvement of Delay, jitter and retransmission efficiency even when there exist a small number of traffic flows, we propose a retransmission method in which NC-based retransmission cooperates with the typical ARQ method. We overcome the disadvantage of NC-based retransmission by combining with ARQ cooperatively. Finally, we show the effectiveness of the proposed methods by extensive computer simulation.
Caixia Yang - One of the best experts on this subject based on the ideXlab platform.
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stable radical cation salt initiated n h insertion and related proton Transfer Delay three component reaction
Tetrahedron Letters, 2016Co-Authors: Congde Huo, Haisheng Xie, Caixia Yang, Jie Dong, Yajun WangAbstract:Abstract The N–H insertion reaction forms the single addition product exclusively, and does not require slow addition of the diazo component. More importantly, we present the reaction of anilines with both diazoacetates and azodicarboxylates in the presence of catalytic amounts of triarylaminium salt giving the corresponding complex unsymmetrical aminals in high yields. This is the first example of stable radical cation salt promoted proton-Transfer-Delay three-component reaction.
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Stable radical cation salt initiated N–H insertion and related proton-Transfer-Delay three-component reaction
Tetrahedron Letters, 2016Co-Authors: Congde Huo, Haisheng Xie, Caixia Yang, Jie Dong, Yajun WangAbstract:Abstract The N–H insertion reaction forms the single addition product exclusively, and does not require slow addition of the diazo component. More importantly, we present the reaction of anilines with both diazoacetates and azodicarboxylates in the presence of catalytic amounts of triarylaminium salt giving the corresponding complex unsymmetrical aminals in high yields. This is the first example of stable radical cation salt promoted proton-Transfer-Delay three-component reaction.
