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To solve the problem of training rate decline in neural network caused by too much noise in the traditional image, a new method of expression recognition based on CNN was proposed. First, in order to narrow the face range, face image could be detected from the original image by using the AdaBoost cascade classifier. Then, the coordinates of the eye, mouth and other key parts and brow, nasolabial and...
Battery energy storage system (BESS) has been used to smooth the wind power fluctuations. However, because of the cost of BESS is relatively high, the effectiveness of fluctuation smoothing has been limited. Meanwhile, capacity optimization of energy storage can reconcile the relationship between energy storage cost and the smoothing effectiveness. Thus, a novel sizing algorithm of BESS is proposed...
A fully integrated THz phase-locked loop (PLL) is proposed. It is consists of a fundamental PLL and a frequency doubler. In order to improve the oscillation frequency and reduced the phase noise, a feedback network composed of buffer amplifiers and capacitors is introduced to the voltage-controlled oscillator (VCO). The wide locking-range divider chain of PLL consists of an injection-locked frequency...
The design of a four-stage common-source (CS) 150 GHz amplifier in a 65nm technology is described. Each stage bases on the proposed technique of coupled transmission line (T-line) neutralization to achieve an improved intrinsic gain. Coupled T-line is also used for impedance matching, including both input and output, and inter stage impedance matching. Simulations show that the proposed amplifier...
This paper presents a 143GHz power amplifier using eight-path power combiner in a 65nm CMOS. The Over neutralization technique is proposed to boost the gain of a differential pair without extra penalty on power consumption. A four-stage PA achieves a maximum gain of 17.3dB at 143GHz with a 3dB bandwidth of 4GHz. Based on the eight-path power combining technology, it delivers up to 13.2dBm saturated...
Recently, the penetration of photovoltaic (PV) power in power system has being promoted rapidly. However, the PV power shows drastic fluctuation which presents great challenge to the power grid. Thus, how to mitigate the fluctuation of PV station needs to be solved. Battery energy storage system (BESS) is flexible to charge/discharge and track the fluctuation of PV power, and also BESS integrated...
Flow velocity estimation is an important feature in ultrasound imaging. However, in conventional color Doppler imaging, only parallel flow components can be estimated, the velocity information is not simultaneously measured throughout the region of interest (ROI) due to sequential firing of the ultrasound beams, and the size of the ROI is limited under frame rate concerns. On the other hand, ultrafast...
A 4.6-GHz Class-F−1 CMOS power amplifier implemented in 0.18-μm CMOS process for wireless applications with high output power and high efficiency is proposed. By using harmonics tuning technique and cascode devices, the proposed power amplifier achieves an output power of 27.8-dBm with power-add-efficiency (PAE) of 32% and quiescent 158-mW dc power consumption.
Aiming at the problem that the dynamic arrival of the virtual network requests in the wireless network environment leads to the unbalanced allocation of the substrate network resources and the low acceptance rate of the subsequent requests, a topology-aware wireless virtual network embedding algorithm (WVNEA-TA) is proposed. By analyzing the dynamic topological attributes of the virtual network and...
In this work, ESD immunity enhancement for the HV n-channel LDMOS with source-end discrete islands fabricated by a TSMC 0.25 μm 60 V process was investigated. An nLDMOS device always has poor ESD capability. If discrete n+ islands are formed in the source end of an nLDMOS transistor, the It2 value of this DUT is upgraded by 4.92% as compared with that of the reference nLDMOS. Meanwhile, if an nLDMOS...
Spacecraft autonomous navigation method based on remote sensing image is a novel method which has been put into practical use in recent year. However, with the restricted computation resource onboard, this method still needs to look for a better way to improve its speed to satisfy real-time requirement. According to the problem above, this paper proposed an alternate method to faster image registration...
For the issue of multi-component system health assessment, an approach of steady algebraic system model learning from the condition data collected over the system serving period was discussed. Faced with the problem of measurement deficiency and inter-component coupling in system working process modeling and drift evaluation, an inclusive data-driven framework supported with corresponding domain knowledge...
Maintenance work-scope is the most important guidance when gas turbines visiting workshop. Maintenance cost and after-maintenance performance of gas turbine are affected by the work-scope directly. Thus, the evaluation method is essential in optimization of gas turbine maintenance work-scope. As after-maintenance performance of gas turbine would be influenced by multi-faced factors, it is not easy...
Airborne light detection and ranging (LiDAR) technology is an active remote sensing technique that produces a true orthophoto at a single wavelength. LiDAR is not as dependent on the weather as optical sensors, and LiDAR features have been widely applied for characterizing land cover classes of interest. Instead of using point-based features for classification, object-based LiDAR features were employed...
Advances in nanotechnology have made it possible to engineer nanomachines. Single nanomachine has limited abilities to accomplish target goals, so a nanonetwork, which is composed of interconnected nanomachines, is expected. To perform cooperative operations, the synchronization of the nanomachines is essential. However, one of the main challenges in synchronizing the nanomachines is the study and...
Modern greenhouse creates suitable crop growth conditions through changing inside temperature, humidity, solar radiation, concentration of carbon dioxide and other environmental factors to raise production and increase economic benefits. The greenhouse microclimate environment model can not only simulate the behavior of a system well but also design the inside controller suitably to be applied to...
Greenhouse temperature system is a typical hybrid system, on account of the inputs of the system include discrete state variables, namely switching status of the environmental control equipment, as well as continuous state variables, namely the external environment factors. Therefor this paper presents a hybrid automata for greenhouse system based on crop temperature integration theory. Firstly, the...
Molecular communication is a novel approach for conveying information at the nano- or micro-scale. The modulation and demodulation schemes for fixed transmitter and receiver nanomachine have been studied in previous literatures. However, it is a big challenge to perform the demodulation when the transmitter/receiver is mobile. The bit symbol will not align due to the movement of the transmitter/receiver...
A fully integrated K-band transformer based power amplifier with neutralization technique is proposed and fabricated in 90-nm CMOS technology. Several cascode cells are combined together as differential power cells. On-chip transformers and current combing topology are used to combine amplifiers as well as to reduce the problem of output power loss. In order to improve the overall stability, neutralization...
HV n-/p-LDMOS devices with the source-side extending into bulk-region to evaluate the electrostatic-discharge (ESD) protection robustness by a TSMC 0.25 µm 60 V process are investigated in this paper. After a systematic analysis, the trigger voltage (Vt1) values of the n-LDMOS with the source-side extending into the bulk-end either by uniformly or non-uniformly distributed manners that had decreased...
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