Interference-aware multipath routing for video delivery in wireless multimedia sensor networks

, Article Proceedings - 32nd IEEE International Conference on Distributed Computing Systems Workshops, ICDCSW 2012 ; 2012 , Pages 216-221 Nikseresht, I ; Yousefi, H ; Movaghar, A ; Khansari, M ; Sharif University of Technology

IEEE 2012

Abstract

Multiple paths are mainly used in order to achieve higher throughput and reduce the end-to-end delivery latency as well. However, the overall network performance greatly suffers from the available interference between paths, even if node disjoint multipaths are used. This problem is highlighted more when dealing with transmission of the video data where the timeliness is of primary concern. In this paper, we propose a novel Interference-Aware Multipath routing for Video Delivery (IAMVD) in the realm of wireless multimedia sensor networks. It constructs multiple paths while considering the effect of different QoS requirements of multi-priority packets, without needing any hardware support for...

The effect of chemical pressure in rutheno-cuprates

, Article Physica C: Superconductivity and its Applications ; Volume 470, Issue 4 , 2010 , Pages 285-290 ; 09214534 (ISSN) Nikseresht, N ; Khajehnezhad, A ; Hadipour, H ; Akhavan, M ; Sharif University of Technology

2010

Abstract

We have studied the effect of negative chemical pressure in the RuGd 1.5(Ce 0.5-xPr x)Sr 2Cu 2O 10-δ with Pr content of 0.0 ≤ x ≤ 0.2. This is also investigated using the bond length results obtained from the Rietveld refinement analysis. The c parameter and cell volume increase with x for 0.0 ≤ x ≤ 0.15. The width of the resistivity transition also increases with Pr concentration, indicating higher inhomogeneity and oxygen deficiency. The difference in the ionic valences of Pr 3+,4+ and Ce 4+ causing different hole doping, the difference in the ionic radii, and oxygen stoichiometry affect the superconducting transition. The magnetoresistance shows a cusp around 135 K which lies between the...

Effect of Ca substitution on crystal structure and superconducting properties of ferromagnetic superconductor RuSr 2-xCa xGd 1.4Ce 0.6Cu 2O 10 -δ

, Article Journal of Magnetism and Magnetic Materials ; Volume 324, Issue 6 , 2012 , Pages 949-954 ; 03048853 (ISSN) Fallahi, S ; Mazaheri, M ; Nikseresht, N ; Rønnow, H. M ; Akhavan, M ; Sharif University of Technology

2012

Abstract

We have investigated the effect of Ca substitution for Sr site on structural, magnetic and superconducting properties of RuSr2 -x CaxGd1.4Ce0.6Cu2O10 -δ system. In this system, the magnetic coupling of RuO 2 and CuO 2 plays an important role in magnetic and superconducting states. X-ray diffraction analysis shows that all samples are single phase and the lattice parameters decrease continuously by increasing Ca content. The onset superconducting transition temperature is found to decrease with Ca substitution. As Ca content increases, rotation of the RuO 6 octahedron increases and RuO(1)Ru angle decreases. These variations strengthen the magnetic moments in the RuO 2 planes. The enhancement...

Long Lifetime Multipath Routing in Unreliable Wireless Multimedia Sensor Networks

, M.Sc. Thesis Sharif University of Technology Nikseresht, Ilnaz (Author) ; Movaghar Rahimabadi, Ali (Supervisor) ; Mehri, Bahman (Co-Advisor)

Abstract

Most of the current routing protocols in the WMSNs only consider the inter-path interference and not necessarily intra-path interference factor which is considered as one of the main causes of energy consumption in these networks. Among those protocols that consider this factor, none of them has ever come up with an algorithm capable of performing the routing without the need to use either the special hardware in the nodes (referred to as the GPS or directional antennas) or with the unrealistic assumption that the interference range is equal to the transmission range. The previously mentioned factors are critical in the sense that the former assumption results in more expensive sensor nodes...