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A critical problem to P2P VoD systems is to provide efficient user interactivity support. In this paper, we study intra- and inter-video operations separately and aim to reduce the latency of these VoD operations by exploiting the locality of reference in user access patterns. With a relaxed definition of data chunk holder, intra-video locality can facilitate a high likelihood of a peer seeking within...
Real-time physiological monitoring of athletes during sporting events has tremendous potential for maximizing player performance while preventing burn-out and injury, and also enabling exciting new applications such as referee-assist services and enhanced television broadcast. Emerging advanced monitoring devices have the right combination of light weight and unobtrusive size to allow truly non-intrusive...
During last two decades, Mobile Ad hoc Networks (MANETs) has been in widespread use. However, in some critical applications such as in battlefield or area sensing, due to the node mobility, limited power and sparse deployment density, MANETs may suffer network partitioning. Without a stable end to end path, these challenged scenarios could cause most existing ad hoc networks protocols to fail. In...
This paper studies the IP network routing algorithm based on mathematical theories and methods. It has analyzed the limitation based on distance vector of routing protocol RIP and based on links the routing protocol OSPF. It proposes an improved Dijkstra algorithm, makes the routers and communication links of the cost (transmission speed and delay) can taken into account. In view of distributed multimedia...
Quality-based routing protocols are proposed to restrict message flooding within only high quality nodes in delay tolerant networks (DTNs). However, different quality threshold mechanisms have diverse impact on the network and we investigate this issue in the paper. Through theoretical analysis we show that heterogeneous threshold mechanism suffers a severe nodal cost imbalance problem. Furthermore,...
Due to the rapidly changing topology of vehicular ad hoc network (VANET), it requires the routing protocol can be able to find out comparatively more stable routes. But the routing protocols in existence are not taking the distinguishing features of vehicles and roadway into consideration, and this brought about challenges to these routing protocols' applicability in VANET. In this paper, we take...
The existing opportunistic protocols of delay tolerant network (DTN) occupy much storage and the prediction-based protocols need to calculate and spread much predication information and the scheduling protocols cannot accommodate to huge complex network. This paper analyses and summarizes the existing DTN protocols and proposes a new DTN routing protocol called CRHC which is based on hierarchical...
We consider problems where multiple agents cooperate to control their individual state so as to optimize a common objective while communicating with each other to exchange state information. Since communication costs can be significant, we seek conditions under which communication of state information among nodes can be minimized while still ensuring that the optimization process converges. In prior...
In an unstructured peer-to-peer (P2P) network (e.g., Gnutella), participating peers choose their neighbors randomly such that the resultant P2P network mismatches its underlying physical network, resulting in the lengthy communication between the peers and redundant network traffics generated in the underlying network. Previous solutions to the topology-mismatch problem in the literature are far from...
This paper describes PGR, an architectural technique to reduce dynamic power via GlitchLess or to improve performance via clock skew scheduling (CSS) and delay padding (DP). It is integrated into VPR 5.0, and is invoked after the routing stage. We use programmable delay elements (PDEs) as a novel architecture modification to insert delay on FF clock inputs, enabling all optimization steps to share...
Tolerant network (DTN) is a kind of network with high latency and frequent disconnection. To guarantee the success of delivering a message to the destination and to make time cost as low as possible, routers in this kind of network (DTN) need to multicopy the message and store it longer than routers in other kinds of network. This paper focuses on the relation and reciprocity between routing and buffer...
Network quality of VANET (Vehicular Ad-hoc Network) is usually bad due to speed variation, high mobility, driver behavior, traffic density, swarm effect, environment complexity, et al. Speed variation dynamically changes the car-to-car distances frequently and results in broken connections. Besides, VANET's network topology usually deployed along with the roadside, the nearby car is very probably...
Researching on delay tolerant networks is an emerging field. Many researchers are dedicated to the approach of the routing algorithms and its applications. With sufficient energy in the core-nodes in the networks, a nested source spray and wait routing algorithm, which is ameliorated from source spray and wait routing algorithm, has been put forward in this paper. The simulation results indicate that...
We present a new multi-path routing methodology called MLB-routing based on multinomial logit model, which is well known as the random utility theory. The key concept of the study is to incorporate multiple paths from same origin to destination, and distribute packets followed by the multinomial logit type probability. Since MLB-routing is pure multi-path routing, it reduce the severe convergence...
There are several surveillance and reconnaissance applications of sensor networks (such as military), which require timely and efficient detection of an event (i.e., enemy troops and vehicles). Moreover, the information gathered is then transferred reliably to a sink, located at a remote control station. Incorporation of multimedia data (e.g., image) certainly enhances the functionality and applicability...
Currently, the field of wireless sensor networks (WSNs) is becoming increasingly important and a challenging research area. Advancements in sensor networks enable a wide range of environmental monitoring and object tracking applications. Moreover, multihop routing in WSN is affected by new nodes constantly entering or leaving the network. Therefore, nature based self-organized and independent mechanisms...
In cognitive radio networks, the new open spectrum operation necessitates novel routing protocols to exploit the available spectrum opportunistically. But due to the non-interfering requirement, a spectrum band used by secondary users may be unexpectedly preempted by primary users at any time, which challenges reliable communications. In this paper, we propose a novel spectrum aware on-demand routing...
DHT-based peer-to-peer systems have been proposed in the past few years. Scalability, fault tolerance and searching speed of the DHT based P2P systems have been greatly improved in contrast to the unstructured P2P systems. These DHT-base systems have the problem of load imbalance. We present a load balancing method taking into account Zipf-like requests distribution and the impact of physical networks...
A new paradigm full-connect dynamic networks on chip (FC-DYNOC), which supports the communication among modules dynamically placed on a reconfigurable device at runtime is presented in this paper. Based on the cluster theory, this structure increased the number of connections between router and process element, and the PE has the ability to select the source and the destination router for transmitting...
Emergency data which mean something happened in sudden need to be dealt with timely, otherwise will bring very serious consequences. To ensure the low-delay routing of emergency data, a novel graded routing strategy, dynamic adaptive cooperative routing (DACR) is proposed in this paper. This scheme extends the LEACH protocol to enable the multi-hop transmissions among clusters by incorporating a cooperative...
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