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Presence Architecture for RFID-based Supply Chain
최선완,김은숙,강신각,J.J. Garcia-Luna-Aceves 안양대학교 산업기술연구소 2004 自然科學硏究 Vol.11 No.1
RFID-based supply chain is performed by using RFID tags and readers to pass RFID tag numbers, and then leveraging the Internet to access large amount of associated information that can be shared among authorized users [6]. The information is for physical objects such as foods, items, goods, equipments, or transportations. They move through supply chain such as manufactures, distributors, and retailers. The movement incurs the change of location (spatial and/or temporal) and ownership. The status of change should be notified to information recipients. This paper defines presence architecture for the RFID-based supply chain. This paper adopts the previous work of the IETF GEOPRIV WG, which applies mobile devices, such as GPS device and cell phone, to a present architecture for the distribution of location objects by examining the existing IETF works [2,3].
On the Multicast Capacity ofWireless Ad Hoc Networks with Network Coding
Zheng Wang,Shirish S. Karande,Hamid R. Sadjadpour,J. J. Garcia-Luna-Aceves 한국통신학회 2011 Journal of communications and networks Vol.13 No.5
In this paper, we study the contribution of network coding (NC) in improving the multicast capacity of random wireless ad hoc networks when nodes are endowed with multi-packet transmission (MPT) and multi-packet reception (MPR) capabilities.We show that a per session throughput capacity of Θ(nT^3(n)) can be achieved as a tight bound when each session contains a constant number of sinks where n is the total number of nodes and T (n) is the transmission range. Surprisingly, an identical order capacity can be achieved when nodes have only MPR and MPT capabilities. This result proves that NC does not contribute to the order capacity of multicast traffic in wireless ad hoc networks when MPR andMPT are used in the network. The result is in sharp contrast to the general belief (conjecture) that NC improves the order capacity of multicast. Furthermore, if the communication range is selected to guarantee the connectivity in the network, i.e., Ω(√log n/n) =T (n) = O(log log n/ log n), then the combination of MPR and MPT achieves a throughput capacity ofΘ(log^(3/2)n/√n) which provides an order capacity gain of Θ(log^2 n) compared to the pointto-point multicast capacity with the same number of destinations.
On the Multicast Capacity of Wireless Ad Hoc Networks with Network Coding
Wang, Zheng,Karande, Shirish S.,Sadjadpour, Hamid R.,Garcia-Luna-Aceves, J.J. The Korea Institute of Information and Commucation 2011 Journal of communications and networks Vol.13 No.5
In this paper, we study the contribution of network coding (NC) in improving the multicast capacity of random wireless ad hoc networks when nodes are endowed with multi-packet transmission (MPT) and multi-packet reception (MPR) capabilities. We show that a per session throughput capacity of ${\Theta}$(nT$^3$(n)) can be achieved as a tight bound when each session contains a constant number of sinks where n is the total number of nodes and T(n) is the transmission range. Surprisingly, an identical order capacity can be achieved when nodes have only MPR and MPT capabilities. This result proves that NC does not contribute to the order capacity of multicast traffic in wireless ad hoc networks when MPR and MPT are used in the network. The result is in sharp contrast to the general belief (conjecture) that NC improves the order capacity of multicast. Furthermore, if the communication range is selected to guarantee the connectivity in the network, i.e., ${\Omega}$($\sqrt{log\;n/n}$)=T(n) = O(log log n / log n), then the combination of MPR and MPT achieves a throughput capacity of ${\Theta}$(log$^{\frac{3}{2}}$ n/$\sqrt{n}$) which provides an order capacity gain of ${\Theta}$(log$^2$ n) compared to the point-to-point multicast capacity with the same number of destinations.