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In this paper we report an in-depth study of power supply reduction towards near-threshold for an 8-transistor CNTFET SRAM cell. Near-threshold voltage provides savings in power consumption, but has negative impact on delays, noise margin and yield. We have incorporated a removed metallic CNT approach to deal with non-semiconductor CNTs. Monte Carlo simulations have shown that with Vdd down to 0.5V,...
In order to extract the vibration feature of remanufactured engines, the vibration signal is decomposed by ensemble empirical mode decomposition(EEMD), and this method is applied to study vibration mode of remanufactured engines. Based on the decomposition of vibration signal, correlation coefficient is introduced to study the correlation between IMF(Intrinsic Mode Function) components and original...
The robotic urban search and rescue (USAR) solution still has a lot of challenges, but it also has huge potentials to reduce the robot operator's in disaster scenes which are usually cluttered, dusty, and time-critical. In this paper, a Kinect-based 3D sensing and human action recognition solution is proposed to fuse 3D mapping, fine object reconstruction, and human identification/tracking into a...
The Minimum Bit Error Rate (MBER) detector is capable of outperforming the conventional Minimum Mean Squared Error (MMSE) detector by minimizing the Bit Error Rate (BER) directly. In this paper, We consider the MBER beamforming assisted multiple-antenna receiver for multi-user Quadrature Amplitude Modulation (QAM) systems. Particle Swarm Optimization (PSO) is then invoked for finding the optimum weight...
Base Station Cooperation (BSC), which exchanges information through a high-speed optical fibre back-haul to increase the diversity gain, has been considered as a promising technique for combating co-channel interference in multi-cell communication systems. A novel reputation-weighted based data fusion scheme for Uplink-BSC (UBSC) systems is proposed in this paper, which exploited the dissimilarity...
In this paper double equilateral U-shaped defected ground structure (DGS) units are applied to relize a size reduced microstrip crossover for Butler matrix application. By embedding the DGS units the size of the microstrip crossover at 900 MHz can be reduced by 14.6% compare to conventional design.
In this paper a new control-interface card for developing simple control loops and generating test signals for power electronic converters is presented. The control board can operate with two computational cores (Texas Instruments and Microchip) allowing using the preferred DSP architecture and development environment. Moreover, the interface board can operate with open hardware Arduino-like boards...
In a bi-directional DC-DC converter for capacitive charging application, the losses associated with the transformer makes it a critical component. In order to calculate the transformer losses, its parameters such as AC resistance, leakage inductance and self capacitance of the high voltage (HV) winding has to be estimated accurately. This paper analyzes the following losses of bi-directional flyback...
Silicon Carbide (SiC) power devices can provide a significant improvement of power density and efficiency in power converters. The switching performances of SiC power devices are often a trade-off between the gate driver complexity and the desired performance; this is especially true for SiC BJTs and JFETs. The recent introduction of SiC MOSFET has proved that it is possible to have highly performing...
We develop a computer vision based system to assist the aircrew in search and rescue operations at sea. The Government flying service of Hong Kong sends out fixed wing planes to search for survivors after a maritime accident is reported. The search usually lasts for a few hours and is currently conducted by the naked eyes to search for orange colored life boats from a height of 500 ft. It is a tiresome...
In this study, we present a Carbon Nanotube (CNT) FET based 8T SRAM cell and its performance in near threshold voltage region. Metallic CNTs (M-CNTs) grow alongside semiconductor CNTs in current synthesis process, but they can be removed using novel techniques. This in turn creates open circuit and degrades the performance and functionality of SRAM cells. In this paper we apply a removed metallic...
In obstacle-dense environments and uneven terrain, tumbling and jumping are efficient modes of locomotion for small robots. A miniature robot with hybrid motion patterns of tumbling and jumping for these environments and terrain is presented in this paper. The robot is 15cm long, 12cm wide, 4cm high, and 260g in weight with two 10cm long arms. The jumping energy is stored by using a reduction gearbox-cable...
Sn-rich Au-Sn solder bonding has been systematically investigated for low cost and low temperature wafer-level hermetic packaging of high-end MEMS devices. The AuSn2 phase with the highest Vickers-hardness among the four stable intermetallic compounds of Au-Sn system makes major contribution to the high bonding strength. The maximum shear strength of 64 MPa and a leak rate lower than 1 × 10−7 torr·l/s...
An open-loop interleaving synchronization control method for a two-phase interleaved micro-inverter operating at the boundary conduction mode (BCM) is proposed in this paper. It shows that the only method that results in stable interleaving operation is the synchronization of the slave converter to the turn-off instant of the master converter, where each converter operates with peak current mode....
A micro-inverter could be directly integrated with a PV panel to generate grid-compatible AC power. Placing two flyback converters in parallel as the DC-DC stage and utilizing interleaving extends the power range of flyback micro-inverters. In this paper, open-loop interleaving technique for flyback micro-inverter operating at the boundary conduction mode (BCM) and discontinuous conduction mode (DCM)...
Stroke is one of the leading causes of disability in the world and Post-stroke rehabilitation trainings are considered to be essential on helping stroke patients to regain the functionality of their body. However, most of the rehabilitation trainings can only be performed under professional supervision inside hospital or caring facilities and as a result, large number of expenditure is generated....
In power electronics there is a general trend to increase converters efficiencies and power densities; for this reason new power semiconductors based on materials such as Silicon Carbide (SiC) and Gallium Nitride (GaN) are becoming more popular. This is especially valid for renewable energies applications where the generated energy has a higher cost than with conventional energy sources. This paper...
This paper introduces a new zero-voltage-switching (ZVS) isolated DC-DC converter with two input ports which can be utilized in hybrid energy systems, for instance, in a fuel cell and super-capacitor system. By fully using two high frequency transformers, the proposed converter can effectively integrate a current-fed boost half-bridge (BHB) and a full-bridge (FB) into one equivalent circuit configuration...
This paper presents a stator ground protection scheme based on the fault current flowing in the breakdown channel. It trips only if the fault current exceeds the fault current tolerance capacity of the generator. Otherwise, it will just emit alarm signals. Thereby, the unnecessary trip-out of large generator can be avoided. The stability of the power system and the generator security can then be ensured...
In order to solve the problems of traditional distance protection when it is used as back-up protection, a novel substation back-up protection scheme based on communication channel of pilot protection is proposed. According to comprehensive decision-making result of action states of protections in local substation and fault detection information transmitted by adjacent substations, the functions of...
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