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With the construction of highway in China, the transportation industry is gradually stepping into the maintenance stage. Whereas the current linear stake number method cannot accurately locate the pavement disease, the road identification theory is introduced to solve the problem of locating pavement disease and the chain scission on highway effectively. However, it has brought many difficulties to...
With the acceleration of China's modernization, soil erosion caused by illegal activities in production and construction projects is becoming serious. Timely and effective monitoring and supervision is necessary. Traditional monitoring methods have many shortcomings, such as long period, limited precision, limited terrain. So it can't demonstrate the real situation of the project construction area...
With the development of modern technology, the practical systems become much more complex, smart actuators and sensors, such as piezoceramic and magnetostrictive material based ones, have widely been used in reality due to its variety of advantages. Therefore, nonlinearities, including not only the dynamical nonlinearity but also the non-smooth nonlinearities both in actuators and sensors, should...
A full range current sensor based on self-bias structure for buck regulator is presented in this paper. The proposed full range current sensor can sense current from both the high side and low side switches of the power regulator within the same switching cycle with input current varying from 50 mA to 500 mA. It has higher than 95% sensing accuracy while consuming less than 1% of the total input power...
Laser absorption spectroscopy is a powerful and versatile chemical analysis tool for the identification and quantification of molecular constituents, which offers the advantages that include fast response, high sensitivity, realtime, in situ and non contact measurements of species without any sample preparation. Therefore, it was widely used in siening of atmosphere or environment monitoring. In this...
This paper proposes to detect event coverage and determines event sources. Generally, an appropriate sensor node is selected as the relay node for gathering and routing sensory data to sink node(s). When sensory data are collected at sink node(s), the event coverage is detected and represented as a weighted graph. Event sources are determined which correspond to the barycenters in this graph. Experiments...
To ensure the security and reliability of the autonomous underwater vehicle (AUV), an intelligent fault-tolerant strategy for integrated navigation systems is presented in this paper. The improved federated Kalman filter (FKF) is designed to fuse the multiple subsystems, including strapdown inertial navigation system (SINS), magnetic compass (MCP), Doppler velocity log (DVL) and terrain aided navigation...
In the practical application of cognitive radio network, it is especially important to improve the energy efficiency for those energy-constrained cognitive users. From the perspective of maximizing the energy efficiency in cognitive radio networks, this paper considers the case that the sudden appearance of the primary user can lead to data collision when the cognitive user is transmitting data. Then...
This paper presents an energy-adaptive performance management technique for the design of embedded signal processing systems powered by renewable energy sources. By jointly considering the nondeterministic characteristics of renewable energy and the unique relationship between signal processing performance and the required energy consumption, a progressive performance tuning approach is developed...
Over one billion smartphones have now been shipped worldwide. These mobile devices feature multi-core CPUs and GPUs, megapixel cameras and an array of sensors. Smartphone sensors can now be processed to diagnose a wide variety of medical conditions including cough detection, irregular heartbeat detection, and lung function analysis. The ability to diagnose ailments in the convenience of patients'...
A new link and energy adaptive UWB-based sensing system is proposed to maximize the detection time coverage of UWB-based pulse radar in embedded sensing applications powered by renewable energy. By jointly considering the link information between the transmitter and receiver of the UWB radar as well as the non-deterministic characteristics of the renewable energy, the proposed system dynamically adjusts...
In order to realize the on-line detection and elimination of unqualified can covers, a binary-channel inspection system based on machine vision is proposed in this article. The system mainly consists of two illumination sources, two cameras, two sensors, an IPC, an interface circuit, two eliminating devices, a set of algorithms for image processing and a software for the control of independent binary-channel...
Location information of nodes is the basis for many applications in wireless sensor networks (WSNs). However, most previous localization methods make the unrealistic assumption: (i) all nodes in WSN are always awake and (ii) the radio range of nodes is an ideal circle. This overlooks the common scenario that sensor nodes are duty-cycled to save energy and the radio range of nodes is irregular. In...
Free probability theory as a main branch of random matrix theory is a valuable tool for describing the asymptotic behavior of multiple systems, especially for those with large random matrices. But classical freeness results mainly focus on random matrices with independent and identically distributed (i.i.d.) entries. In this paper, by using the latest research results of random Vandermonde matrix...
In wireless sensor networks, locating a source from its emissions has gained considerable interest over the past few years. In this paper, an enhanced constrained total least squares estimator is proposed for the localization problem under an additive measurement error model. Compared with CTLS algorithm, our method takes not only linear term of TDOA measurement noise but also quadratic term which...
A simplified generic method of calculating equivalent piezoelectric sensor output signal is presented for solving the signal analysis problem of shaped piezoelectric sensors laminated on double- curvature elastic thin shell. Piezoelectric sensor is discretized into many sub-areas by finite difference (FD) method. The sub-areas of FD nodes located inside or on the edge of the sensor have different...
Given the burgeoning demand for a small, lightweight, consume very little power, low-cost high performance inertial Measurement Units(IMU), test methods are necessary to evaluate the current state of the available of Micro-Electro-Mechanical Systems(MEMS) technology. A reliable and efficient calibration and testing method for evaluating the performance of MEMS IMU is developed, by virtue of MEMS sensor...
The performance of data acquisition systems has been increasing steadily to cope with the need for continuous improvement in manufacturing floor and machine efficiencies. The Ethernet network has become the most popular network in data acquisition systems to reduce media costs and achieve the higher performance. This paper presents the development of a standard network data acquisition system that...
The performance of industrial communication networks are a key element for developing high-speed distributed data acquisition systems. This paper presents a practical networked data acquisition system who implements distributed data acquisition linking field sensors to PC through EtherCAT bus. we evaluate the performance of the designed networked data acquisition system and provide the verified results...
Technology advantages of body sensor networks (BSN) have shown great deal of promises in medical applications. In this paper we introduced a wearable device for biofeedback application based on the BSN platform we had developed. The biofeedback device we have developed includes the heart rate monitoring belt with conductive fabric and the biofeedback device with respiration belt. A wearable respiratory...
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