Time reversal of water waves Przadka, A; Feat, S; Petitjeans, P ...
Physical review letters,
2012-Aug-10, Letnik:
109, Številka:
6
Journal Article
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We present time reversal experiments demonstrating refocusing of gravity-capillary waves in a water tank cavity. Owing to the reverberating effect of the cavity, only a few channels are sufficient to ...reconstruct the surface wave at the point source, even if the absorption is not negligible. Space-time-resolved measurements of the waves during the refocusing allow us to quantitatively demonstrate that the quality of the refocusing increases linearly with the number of reemitting channels. Numerical simulations corresponding to water waves at larger scales, with negligible damping, indicate the possibility of very high quality refocusing.
In this paper, a novel chaotic encryption-based blind digital video watermarking technique (DVWT) is presented for grayscale and color images. This method makes use of Discrete Cosine transform (DCT) ...prior to embed the watermark in the hosting video. The hosting video is split into frames of 8*8 nonoverlapping blocks before employing DCT, and watermark bit is implanted by altering the variations among the nearby DCT coefficients of neighboring blocks. Arnold transform is applied for chaotic encryption to offer extra security to the watermark. A set of three versions of the proposed model has been applied and the results are investigated. The experimental outcome confirms that the DCT-VWT is efficient on different image processing functions such as JPEG compression, sharpening, cropping, and median filtering. The comparative analysis ensures that the presented DCT for digital video watermarking technique (DCT-DVWT) is efficient under subjective as well as objective way.
Paper Usually, Mobile Ad hoc Networks (MANET) is a dynamic background thus complicated to supply a perfect resolution to convince the Quality of Service (QoS) needs for many applications. In this ...paper, we introduce a mechanism, namely Bandwidth and Mobility based Stable Route (BMSR) Formation for increasing network efficiency in MANET. In this mechanism, we choose the relay node by the node mobility, bandwidth and quality of link. This mechanism considerably increases the node reliability and stability in the network. Thus it diminishes the probability of link breaks and the overhead. The simulation analysis indicates that the proposed method provides guarantee QoS and network efficiency.
A sensor network with wireless communication channel and often termed as WSN comprises of a set of such as nodes with different computing power, and different energy levels. Clustering is an approach ...to increase the availability of the nodes in the network in terms of lifetime. But an efficient and an optimal to increase the remaining life period of the network is to use an efficient routing approach with hierarchical architecture where at different levels of clusters are formed. Efficient cluster formation in terms of energy and reliable routing are two widely analyzed challenges in WSN. Despite various clustering approaches developed by so many researchers still the design of optimal clustering strategy is remaining as an open challenge. This paper focuses on the design and evaluation of an energy-efficient hierarchical clustering approach of integrating an evolutionary algorithm and the Adaptive Threshold sensitive Energy Efficient routing protocol. Genetic Algorithm (GA) is used to optimize the energy exhaustion in the network.
The conventional Food Supply Chain Management (FSCM) faces a variety of provocation such as ambiguity, security, cost, complication and quality concerns. To resolve these issues, supply chain must be ...precise. A challenging assignment in today’s food industry is distributing the high quality of foods throughout the supply chain management. In this paper, proposes an efficient Bayes Classifiers Algorithm which integrated with FSCM using Internet of Things (IoT) to allow tracking, tracing and managing the entire process of food supply chain such as supplier, exporter and customers. The objective of this paper is to determine the food safety and to optimize chronological data produced to analyze the effective possibility of future assump- tions. It also aims to foods carrying from the manufacturers to the customers with help of IoT technologies to bond the producer to the customer with delivery of high class of food products. IoT based Food Supply Chain Traceability is utilized t o data transaction effectively with indeterminate, uncertain and insufficient information. So the proposed efficient Bayes Classifiers Algorithm will be capable to overcome all provocation of conventional supply chain and afford secure background and food safety for FSCM process using IoT technology.
Mobile Ad hoc Network (MANET) is a particularly disputed network because of its particular features, for example, active topography, decentralization, as well as neighbor depend routing. In MANET, ...any mobile nodes can connect or disappear arbitrarily; thus, mobile nodes cannot awake which node is it joined with, and this creates resources been dealt between unknown nodes that can be trusted or not. As a result, without any trustworthiness makes the main susceptibility in security concerned aspects of the MANET. In this situation, trust value employs a vital function in all network performance. This paper introduces DempsterShafer theory and Encounter based Trust Routing (DETR) in a MANET. In this scheme, the direct trust and indirect trust is used to compute the mobile node trust. The node cooperation and encounter rate parameters measure the node direct trust in the network. The node indirect trust is computed based on the neighbour node opinion using DempsterShafer theory. Simulation results demonstrate that DETR detecting untrustable nodes in the network.
Wireless Sensor Networks (WSNs) have increased huge consideration because of their wide scope of utilizations. In these networks, the sensor hubs gather various kinds of information from the general ...condition. During the transmission of collected data packets, some of them will be dropped due to the collision of packets. So, collide packets are retransmitted which may lead the network to high energy consumption. As Medium Access Control (MAC) protocol has responsible for reliable communication in WSN, an enhanced MAC protocol has to be proposed for improving energy efficiency of the network. By considering this solution, Fuzzy Based Enhanced Medium Access Control protocol (Fuzzy-MAC) is proposed in this paper. Before transmission, data packets are prioritized using the Fuzzy system. Then the packets are transmitted in light of the need of the parcels. Simulation results show that the exhibition of the proposed Fuzzy-MAC beats that of existing MAC protocols as far as energy utilization, delivery ratio and throughput.
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