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While current implementations of LIDAR-based autonomous driving systems are capable of road following and obstacle avoidance, they are still unable to detect road lane markings, which is required for lane keeping during autonomous driving sequences. In this paper, we present an implementation of semantic image segmentation to enhance a LIDAR-based autonomous ground vehicle for road and lane marking...
In the view of the complex environment of high altitude areas, a solar chimney power plant experimental setup with a chimney 15 m in height and a collector 15 m in diameter was built. The temperature and velocity of air flow within the collector were tested and analyzed. The results show that the variation of air flow temperature and velocity are similar to the solar radiation. Furthermore, the energy...
Because of the low power losses and moderate cost, the magnetic powder cores are popular in producing the filtering inductors for the high efficient and cost-effective power converters. However, the soft magnetic property of the powder cores leads to the wide variation of inductance along with the changing of the inductor current in one cycle of the grid, which challenges the system stability and...
The modular paralleled three-level T-Type Inverters (3LT2Is) have been widely used to extend the power capacity. However, zero-sequence circulating currents (ZSCCs) are generated due to the difference of parameters between the paralleled inverters. The ZSCCs will lead to various issues, such as output current distortion, unbalanced current distribution and system loss increasing, etc. The finite control...
Shunt active power filters (S-APF) are highly popular ways for harmonic compensation due to the high performance and simplicity of installation. S-APF is commonly controlled in current control mode with load harmonic current detection, which is not quite suitable for the distributed power generation system (DPGS) where the nonlinear loads are highly dispersed. Local harmonic voltage detection based...
The triangle carrier based pulse width modulation (TCB-PWM) can be functionally equivalent to space vector base PWM (SVB-PWM). For multi-level inverter, it is very difficult to realize the SVB-PWM because its vector space is very complex. In this paper, a unified TCB-PWM strategy for three-phase N-level diode clamped inverter, including continuous PWM (CPWM) and discontinuous PWM (DPWM), is proposed...
As influenced by environment, deterioration of material, while using infrared focal plane array (IRFPA) device, new blind pixels will appear inevitably The blind pixels can badly reduce the image quality. If there is no condition for precise detection and compensation afresh, a on-line method for blind pixels capture and compensation is introduced. The method has acquired well effect in actual work...
In the fault diagnosis method of the resonance demodulation of the planetary gear of the wind turbine, there are some shortcomings like artificial difficulties in demodulation band and low demodulation spectral resolution. In this paper, wavelet packet decomposition and reconstruction method are used effectively to extract the resonance frequency components caused by the local fault of gear, which...
We exploit how to overcome phase damping decoherence when the phase damping parameters are uncertain. It is shown that the “relaxed” control goal may be achieved by combing simple open-loop coherent control with periodic projective measurements. Both the sufficient conditions and constructive design procedures are presented. The control design is reduced to selecting the period of projective measurements...
A dual orbital angular momentum (OAM) mode antenna with l=0 and l=4 mode wave is presented. The proposed antenna employs a transmitarray and a reflectarray and uses a dual-polarization conical horn as the feed. By using two orthogonal linear polarization waves as excitations, the antenna can generate a pencil beam and an OAM beam, respectively.
Capacity-coverage tradeoff balancing is a classical but critical problem for practical wireless multi- cell network optimization. Increasing the average capacity is often at the expense of decreasing the cell coverage and vice versa. It becomes more complex in massive multiple-input/multiple-output (MIMO) networks to balance the above two performance indicators since capacity is much highly improved...
As Cloud-deployed applications became more and more mainstream, continuously more complex services started to be deployed. The deployment involves multiple-layered systems and application itself. Where, failure of any point will disrupt the whole availability and auto-healing is one of the most indispensable features of the Cloud management. The micro-service model and Cloud management platform decouples...
This paper presents a dual-band 2×2 WiFi transceiver in 28nm bulk CMOS. Achieved receiver and transmitter EVM floor at 5GHz for 160MHz per channel are −35dB and −33dB, respectively. The 2.4GHz integrated PA provides 26.5dBm saturated output power while its 5GHz counterpart delivers 26dBm. The 2.4GHz receiver features mixer first architecture while the transmitter includes a 2nd harmonic notch for...
We consider a wireless information surveillance in UAV network, where a legitimate unmanned aerial vehicle (UAV) proactively eavesdrops communication between two suspicious UAVs. However, challenges arise due to lossy airborne channels and limited power of the UAV. In this paper, we study an emerging legitimate eavesdropping paradigm that the legitimate UAV improves the eavesdropping performance via...
The supportive number of users achieving the maximum sum rate is studied in uplink massive MIMO systems for zero-forcing (ZF) and maximum-ratio combining (MRC). We obtain the lower bound of the achievable rate of each user for ZF and MRC receivers with any finite number of base station (BS) antennas, respectively. By this theoretical result, this paper will focus on the supportive number of users...
This paper presents a kernel-based extreme learning machine (KELM) modeling method for speed decision making of autonomous land vehicles (ALVs) on rural roads. The model is obtained offline via the KELM algorithm using a small number of typical samples collected by an ALV platform on rural roads from experienced drivers. Compared with other typical machine learning algorithms such as support vector...
Space utilization are important elements for a smart city to determine how well public space are being utilized. Such information could also provide valuable feedback to the urban developer on what are the factors that impact space utilization. The spatial and temporal information for space utilization can be studied and further analyzed to generate insights about that particular space. In our research...
In order to control the neutral point voltage of inverter with discontinuous PWM (DPWM), this paper proposed a generalized discontinuous PWM (GDPWM) based neutral point voltage balancing method for three level neutral point clamped (NPC) voltage source inverter (VSI). Firstly, a triangle carrier based (TCB-GDPWM) is proposed. Secondly, the affection on neutral point voltage for the modulation wave...
Current regulation is a critical issue for the stable operation of three-phase active power filters (APF). The challenge of the current controller lies in how to track the high slew rate reference with zero steady-state error in a fast and accurate way. Conventionally, multiple paralleled second-order generalized integrators (SOGIs) are utilized to achieve those objectives. However, it will increase...
Fractional-order repetitive control (FORC) has been demonstrated to be able to offer high control accuracy for active power filters (APFs) to compensate the harmonics even in the presence of wide range grid frequency variations. However, the online coefficient update mechanism of the FORC, which significantly influence the control precision, has not yet been carefully studied. In this paper, the effect...
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