In this paper, we propose a new medium access control (MAC) scheme called dynamic contention window adjustment (DCWA) in saturated load conditions, which dynamically optimizes each active node's backoff process wireless LANs. The key idea is to enable node adjust its Contention Window (CW) approach the optimal one that will make throughput achieve or maximum. Meanwhile, all nodes maintain approximately identical CWs guarantee fair channel sharing among nodes. Through simulation comparison...

Energy efficiency is the kernel issue in designing of wireless sensor network(WSN) MAC protocols. S-MAC a WSN protocol based on listen and sleep mechanism to reduce energy consumption. Synchronous frame belongs control information, so it's better it as much possible. In addition, adopts virtual cluster synchronization which leads generation border nodes, nodes will exhaust more easily earlier. This paper analyzed S-MAC, proposed LO-MAC protocol. The improved by decreasing consumption thus...

Image registration is an important processing step in synthetic aperture radar (SAR) image applications, such as change detection, and elevation extraction. The cross-correlation method widely employed to find the matching points realize due its effectiveness, simplicity. However, large number of pixel operations, whole sliding operations make it a computationally intensive problem, difficult adapt situation increasing amount, volume SAR images. Graphics unit (GPU) based high-performance...

In recent years, it has been a research hotspot to apply big data-driven deep learning methods Synthetic Aperture Radar (SAR) target recognition with limited data. However, the problem caused by long-tailed characteristics of SAR data long ignored. Specifically, majority samples are concentrated in few categories, leading skewed distribution This can cause bias towards class, which subsequently degrade performance minority class. issue is further exacerbated sample conditions for...

The water flow energy of rivers is an important renewable and clean that plays a vital role in human life but challenging to harvest at low velocity. This work proposes bionic fish-shaped triboelectric-electromagnetic hybrid generator (BF-TEHG) via two-stage swing mechanism for harvesting energy. It designed simulate the shape fish, effectively improving its ability utilize low-velocity enabling it operate minimum rate 0.24 m/s. Furthermore, impact motion parameters on electrical performance...

Vehicular ad hoc networks (VANETs) are viewed as an effective way to disseminate content among vehicles on the road. While most of current research efforts in VANETs focus improving packet delivery performance, only limited work aims provide cost-efficient solutions for downloading. This paper proposes a novel approach download common way. The basic idea is stimulate cooperatively mutually disjoint coalitions. To study cooperation vehicles, coalitional game model proposed. Moreover,...

With the development of synthetic aperture radar (SAR) technology in recent years, we have to face huge amount data. So, fast image processing seems be really important domain SAR. Based on situation above, a new method accelerate SAR is proposed this paper. The employs SIMD (Single Instruction Multiple Data) instructions and OpenMP (Open Multiprocessing) multi-core CPU realize parallel optimization algorithms. CS (Chirp Scaling) algorithm also chosen process data our experiment....

High-precision DEM can be generated by SAR interferometry processing with GaoFen-3 repeat-pass data. This paper presents the first results from Interferometry obtained two interferometric data pairs at selected experiment sites. The temporal separations were 29 days. At site coherence requirements met, resulting in high quality interferogram. experimental show that have some good characteristics, such as imaging quality, stable spatial baseline, correlation and correlation, which has a...

To investigate the potential property contained in user profile, providing an ideal platform for information exchange and sharing within social network users, to propose a client-targeted community detection algorithm based on analysis of profile. Community is finally accomplished by combining users who are similar interest, study purpose behavior consideration similarity users' multiple properties. A classic test concerning data partition suggests that this feasible effective.

Due to independence of weather condition and sun illumination, Synthetic Aperture Radar (SAR) has been widely used in airborne remote sensing satellite ocean observation fields. With the increase swath higher resolution requirements, SAR imaging algorithms require further study. However, as a research support, echo data massive increase. So high efficient simulation is required emergently. optimized accelerate, based on AVX/SSE vector instruction set OpenMP. Experiments demonstrate that case...

IEEE 802.15.4 has poor performances in multi-hop network for the hidden terminal problem (HTP). This paper proposes a simple and effective mechanism to reduce HTP nonbeacon-enabled network. Using idea of RTS/CTS 802.11 reference, we propose adaptive adoption (a-RtsCts-CSMA/CA) depending on collision result transmissions measure its NS-2. The simulation results reveal that a-RtsCts-CSMA/CA outperforms RtsCts-CSMA/CA which use every time before sending data packet unslotted CSMA/CA energy...

To avoid unnecessary duplication of processing and meet the real-time requirement video SAR. An image formation algorithm spaceborne SAR based on sub-aperture extended chirp scaling was proposed in this paper. Firstly raw data segmentation approach presented to realize frames continuous output. Then a frame divided several sub-apertures, after CS frequency sub-bands sub-apertures were combined achieve desired high azimuth resolution frames. This innovative can processing, so as improve...

In this paper, the study on digital elevation model (DEM) reconstruction using Gaofen-3 satellite repeat-pass synthetic aperture radar (SAR) interferometry is presented. The coherence of single-look complex (SLC) images and residuals interferogram provide a powerful guarantee for interferometric processing Gaofen-3. Baseline estimation key factor to generate accurate DEM with SAR interferometry. This paper uses coarse orbit data precise carry baseline prior information refine estimation....

Wireless sensor network is a new type of wireless network. It has been widely application in the communication, transmission, embedded computing, environmental monitoring and other fields. As nodes are often set complex geographical environment had not continuous power supply, thus saving energy one main directions research. Cellular automata mimic biological cell reproduction form dynamical system, with simple rule to reveal global characteristics. This paper presents kind cellular routing...

In this paper, we investigate how to utilize the surplus resources in intermittently connected vehicular networks (ICVNs) help target vehicles downloading and processing files from remote server. To end, propose a fog-enabled scheme for ICVNs make pooled distributed among moving work cooperatively. Specifically, each vehicle is served by virtual mobile fog node whose are extracted set of supporting coming opposite direction. The corresponding instead one download chunks raw data server...

A challenge in video tracking is effectively utilizing temporal correlation to navigate the complexity of a scene without imposing additional computational requirements. Different from trackers that rely on online update templates, our methodology introduces concise and efficient Siamese tracker, which assimilates information via an offline strategy, named SiamGPF. Given potential for target display varied appearances over time, dependence solely static template proves inadequate addressing...

Abstract Stochastic optical reconstruction microscopy (STORM) is extensively utilized in the fields of cell and molecular biology as a super-resolution imaging technique for visualizing cells molecules. Nonetheless, process STORM frequently susceptible to noise, which can significantly impact subsequent image analysis. Moreover, there currently lack comprehensive automated processing approach analyzing protein aggregation states from large number images. This paper initially applies our...