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In the wireless sensor network, the nature of sensor nodes has a direct impact on the network life cycle. In order to improve the energy efficiency of nodes and extend the network lifetime, WSN acquisition nodes are studied. SAW based on a micro force sensor is used as a sensor node, and the frequency and pressure transformation model of SAW sensors is established by the principle of least squares...
Mobile service and wearable devices have become a new hotspot in recent year. People also pay more attention to the problem of e-health. Cardiovascular disease is a kind of serious disease that jeopardizes the health and life of human beings which has been widespread concern by academic and practice researchers. But the automated monitoring and prevention of heart disease, cardiovascular disease and...
Metal-stripe surface grating structure presents a stable single-mode operation for THz quantum cascade lasers due to its strong coupling mechanism and easy tuning. We use sampled metal-stripe gratings to establish a distributed feedback and scale the single-mode power by tune the grating parameters. Record single-mode power more than 500 mW at 10 K is achieved.
Integrated modular avionics (IMA) is one of the most advanced systems. Its performance greatly impacts on the working condition of aircraft. For enhancing the safety and reliability of aircraft, this paper researches on modeling of IMA degradation. Since the intermittent fault occurs in the degradation of electronic device, it can be considered as one of the characteristics of degradation. The IMA...
In order to evaluate the influence of AC flashover on the insulation performance of Ethylene Propylene Rubber (EPR) at different temperature, the characteristic indicators were studied, based on the polarization and depolarization current (PDC). In the paper, the partial discharge inception and extinction voltage and the flashover voltage were firstly measured under AC voltage at the ambient temperature...
In this paper, we establish the adaptive backstepping controller designed using the standard technique aiming at the class of block-strict-feedback nonlinear system subject to unknown constant parameters. We have given the tuning function at every step of the design which used for parameters estimation. An illustration example is proposed and then used in the intelligent lighting test platform to...
Analog transmission schemes for wireless video multicast, especially SoftCast, have gained great attention recently. SoftCast can overcome the "cliff effect" by delivering the linear transformations of video pixels, which is unavoidable for digital schemes. Considering the fact that different parts of image#x002F;video have diverse importances to the human perception, in this paper, a new...
Traffic classification is becoming one of the major applications in the data center networks with a lot of cloud services. Recent works about software defined networking (SDN) have found new ways to manage data center networks. However, with the imbalance of the elephant and mice flows is sharpening, the accuracy and efficiency of traffic classification have become more and more important in SDN management...
Wearable devices with various sensors are useful instruments to monitor human health. Due to the limited size, these wearable devices, however, always encounter critical energy problem, which further hinders their widely application. Considering that wireless communication dominates the total energy consumption, we make an in-depth study on the problem of communication energy consumption in body sensor...
In order to find out the tradeoff between recovery time and resource overhead when a link failure occurs, we propose a software-defined based fast restoration scheme for elastic optical datacenter networks, called precomputation based restoration path (P-RP). By extending the controller functionality and OpenFlow protocol in software defined networking (SDN) technology, we establish a novel elastic...
Hybrid Digital-Analog (HDA) transmission for wireless video multicast, has gained great attention recently, as it can integrate the advantages of digital and analog coding simultaneously. In this paper, a new HDA video transmission scheme is proposed, named VCAST, which exploits the visual information to improve both subjective visual and objective quality. Since the visual information reflects human...
We report high-performance continuous-wave (C-W) THz quantum cascade lasers with semi-insulating surface-plasmon waveguide. Epitaxial-side down mounting process was developed to enhance heat extraction from the active region. C-W power above 100 mW and C-W wall-plug efficiency above 1.5% was obtained. The highest C-W operation temperature was 70 K.
Electrical tracking is one of the main reasons for the deterioration of insulation surface. According to the problem of the surface electrical tracking erosion of insulation used in the high-voltage mining cables, the Ethylene Propylene Rubber samples with different electrical tracking development stage were selected in the paper. The relationship between the surface electrical tracking erosion degree...
Ethylene Propylene Rubber (EPR) with excellent dielectric properties has been widely used as cable insulation specially to be used where cables need to be moved frequently, such as in coal mine. Usually, theses cables will be bending excessively, coupled with the electric stress and thermal stress, the aging of the insulation tend to accelerate and the strength of insulation could decrease, with the...
Defects of Ethylene Propylene Rubber (EPR)cablesare the source of partial discharges, which will lead to insulation degradation. The flashover voltage and discharge properties along the surface of EPR were measuredunder edge to edge electrode, needle to edge electrode and rod to ring electrode. Experimental results show that the flashover voltage magnitude over EPR depends on the type of voltage....
In order to solve the multi-robot task allocation problem in logistics warehouse environment, first a robot task allocation model is established in which a corresponding benefit function is established with a consideration of two mainly factors including time window and distance. Then the ant colony algorithm pheromone updating rule is improved combining with working environment and task allocation...
Equipment failures are becoming one of the major threats in the chemical process industry. The marriage of WSN and large scale of monitoring data bring the new challenges. To address these issues, in this paper, we propose surveillance methods that can monitor the running condition of chemical equipments. Our methods are based on skyline operator and quickly identify such equipment in potential danger...
Option and other financial derivatives are becoming more and more important in financial market. As one of the most important financial activities, reasonable option pricing not only makes the trade market steady and orderly, but also provides investors valuable information to make decisions. As the growth of the financial data and the inherent complexity of option pricing methods, option pricing...
In the past few years, image retrieval has been one of the hot spots in computer vision field. Among many image retrieval techniques, Bag-of, Word (BoW) model is one of the effective and efficient methods that can search images with visual vocabularies and it is insensitive to massive data and various geometric attacks. But the classical BoW algorithm used some descriptors as its visual words, such...
In this letter, a novel low profile tri-band frequency selective surface (FSS) with miniaturized periodic element based on complementary structure is presented. The proposed FSS element consists of two split square loops connected with a convoluted cross dipoles in the center, and its complementary pattern etched at the bottom of the substrate. The proposed FSS provides tri-band performance. In this...
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