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The rapid spread of smartphones has led to the increasing popularity of Location-Based Social Networks(LBSNs) like Foursquare, Gowalla, Facebook Places and so on where users can publish information about their current location. In LBSNs, identifying home locations of users is very important for various applications like effective location-based advertisement and recommendation. However, this problem...
Metamaterial Electromagnetically Induced Transparency (EIT) structures have attracted much attention for their significant applications in terahertz rotation sensing, filters, storage and temperature sensing elements. However, most researches on terahertz metamaterial EIT are polarization dependent, which limits their application. In this work, we proposed a terahertz EIT structure with polarization-independence...
Photonic crystal is a kind of functional band gap material with periodical units and arrays. Due to its unique electromagnetic properties, such as photonic band gap and photonic localization, photonic crystal has become one of key research area across the world. Recently, it is observed that the multilayer structure of a stack of monolayer graphene sheets separated by dielectric slabs at low-terahertz...
In this paper, radiation from a PCB trace with broadband harmonic frequency signals is proposed. For the digital signal, there are high harmonic frequency component current. These current will cause the radiated emissions which is called electromagnetic interference. Some of the radiated emissions emit or couple from the PCB traces. It means that the PCB traces act as the antenna. We design some experiments...
This article presents the scanning mechanism of push-broom satellite antenna working at 140 GHz. Such kind of antenna can be applied into many areas, such as imaging, ocean surveillance and astronomical observation. The feeds are placed at the rotary focus with a spacing of 1.72 cm between two adjacent feeds, and the center distance from the feed to the reflector surface is 14.48 cm. Meanwhile, the...
Understanding Activities of Human Daily Life is a fundamental and essential AI problem for Pervasive Computing and Human-Computer Interaction. Activity Sensing has attracted enormous research on activity recognition from mobile sensor data. However, there are two challenging problems: There is no standard taxonomy of activities and there is a lack of research on sensing high level activities. To this...
Ship target detection in optical remote sensing images has attracted more and more attention in the field of remote sensing. The ship target detection technology of optical remote sensing images is vulnerable to many factors, while the real data are difficult to contain various elements. In order to obtain the various situations in the large sea scenes, we develop a simulation system for high-resolution...
This paper proposes a 4-layer device virtualization system architecture based on multi peer nodes. First, the different layers of deployment and the operation processes of the system are discussed, then the resource management and the information flow are described. Finally, the interface and task assignment of the proposed system is discussed using experiments and the effectiveness and stability...
In this paper, we propose a power control scheme in which a macrocell user and femtocell users are subject to the probability constraints with packets delivery rate and time delay, respectively. This scheme aims at maximizing the net benefits among the network users. Since channel gains are uncertain, a probability density function is used to transform the uncertain constraints into certain ones....
This paper presents an approach for the improvement of transmittance in capacitive grid polarizer with dielectric substrates by introducing antireflection(AR) coating. The capacitive grid polarizer using Cu material is printed in the dielectric substrate of PTFE. According to different position relations between grid and substrate, the four structures of the AR coating are verified by the reflection...
Reasonable ratio of air to fuel is an important measure to ensure combustion efficiency for rolling reheating furnace, the optimization of which in the real operation is more like art than science. The target of energy saving can be achieved by adjusting air-fuel ratio according to online measured combustion state. However, in most engineering application, only atmosphere in gas flue is detected for...
In the modern industrial process control, the development of distributed control system (DCS) makes the application of data-driven soft-sensing methods available. Deep learning (DL), as a novel training strategy of deep neural networks, has large potential for soft sensor modeling. In comparison with shallow neural network, because DL can make full use of massive process by greedy layer-wise training...
In this paper, we propose a new method to evaluate the placental maturity. Firstly, we extract both the gray-scale intensity from B-mode ultrasound (US) images and blood flow information from color Doppler energy (CDE) images by the visual feature detector and descriptor. After fusing information, we apply the feature encoding method, a multi-layout fisher vector (MFV), to improve the staging performance...
Usually, the stray signals from antenna test environment and compact antenna test range (CATR) system may cause errors in the measured patterns. In order to improve the measurement accuracy of a specific antenna test system, the techniques about antenna pattern correction for mitigating the effects of these stray signals are required. In this paper, a two-unit virtual array method and its extended...
A wideband UHF RFID reader antenna with Wilkinson power divider and the composite left and right hand (CRLH) transmission lines is proposed. The antenna is composed of a Wilkinson power divider, CRLH transmission lines, and two open-ended microstrip meander lines. The traditional Wilkinson power divider has a 1/4 wavelength band microstrip transmission line, as transmission line is a narrow band,...
A compact triple band antenna array for GNSS application, covers GPS L1, L2 and L5 frequency bands, is proposed in this paper. The array is comprised of 4 radiating elements spaced 0.47 wavelength apart (center to center) at the GPS L1 band and filled with dielectric material and three stacked patches. It is observed that due to the compactness of the antenna array the mutual coupling degrades the...
This paper focuses on the digital control technique and its industrialization of high-power three-phase three-level rectifier system. Firstly, the mathematical model of three-phase three-level VIENNA rectifier is established. The multiloop control method is realized based on the DQ coordinates, and a simplified three-level space vector pulse width modulation method which could simplify the calculation...
In this paper, a compact tanh/linear dual profile corrugated horn in millimeter-wave band is proposed. To reduce the size of the horn and achieve a low sidelobe level, the parameters of the corrugation profile have been optimized by the commercial software CHAMP. At the central frequency of 94 GHz, the simulation results show that the proposed horn can achieve very low sidelobe around −50 dB with...
A wideband circularly polarized (CP) microstrip multiple-input-multiple-output (MIMO) antenna for long term evolution (LTE) systems is proposed. Wideband feed network (WFN) based on coupled-line power divider and phase shifter is utilized to provide two ways of orthogonal signal. Then a square patch loaded with quad-symmetrical slots produces the CP radiation. The antenna design is simulated and the...
With the degree of parallelism increasing, performance of multi-threaded shared variable applications is not only limited by serialized critical section execution, but also by the serialized competition overhead for threads to get access to critical section. As the number of concurrent threads grows, such competition overhead may exceed the time spent in critical section itself, and become the dominating...
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