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This work presents a compact ADC architecture capable of digitizing the signals received by every individual element of a 2D ultrasound transducer array. An element-matched layout of 150 μm × 150 μm is realized by exploiting each piezo-electric transducer element not only as the signal source, but also as the electro-mechanical loop-filter of a continuoustime band-pass ΔΣ ADC, thus minimizing the...
This technical note is aimed at studying the joint impacts of the system dynamic structure and the communication topology on the synchronization of multi-linear positive systems. Through rigorous analysis, necessary and sufficient conditions are given to guarantee the coupled systems achieving positive synchronization under the distributed control protocol, and the gain matrix designed is related...
There is a disadvantage of the traditional SVPWM techniques of six-phase motors, it does not consider the synthesizing vector in harmonic subspace. This thesis proposes modified SVPWM techniques based on twelve vectors. The novel techniques are simulated in Matlab/Simulink system and simulation results are given. Finally the SVPWM techniques are realized in the practical platform.
In this paper the mathematical model of six-phase induction motor is established. Then the phase-fault SVPWM algorithm is put forward, and the simulation model is built in MATLAB to verify the feasibility of the algorithm. The system simulation and experiment of phase-fault of the six-phase induction machine are performed.
Hybrid DC circuit breaker, a combination of disconnector and multiple power electronic devices, has gained popularity for its low-loss at normal operation and its quick and effective circuit breaking during fault protection. However, its bulkiness threatens to limit its application in multi-terminal DC system, where the terminal is usually connected to more than one transmission lines and hence the...
Key element protection of combat system is a challenging problem in modern combat. Effectively evaluating the key elements would be of great help in force deployment in crisis situations. This paper proposes a new evaluation method that combines expert evaluation, PCA (Principal Component Analysis) and TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution). Specifically, we first...
Recently, convolutional neural networks (CNNs) have achieved great success in fields such as computer vision, natural language processing, and artificial intelligence. Many of these applications utilize parallel processing in GPUs to achieve higher performance. However, it remains a daunting task to optimize for GPUs, and most researchers have to rely on vendor-provided libraries for such purposes...
Data acquisition from 2-D transducer arrays has become one of the main challenges for the development of endoscopic and catheter-based 3-D ultrasound imaging devices. Front-end ASICs with sub-array pre-beamforming have been reported that reduce the cable number by an order of magnitude. Further channel reduction requires digitization in the front-end ASIC to facilitate more in-probe data processing...
Forward-looking intravascular ultrasound (FL-IVUS) transducers are needed to image complex lesions in the coronary arteries, such as chronic total occlusions (CTOs). To achieve 2D and 3D FL-IVUS imaging, transducer arrays can be integrated at the tip of the catheter. However, connecting the elements is challenging due to the limited space available. In this work, we present a FL-IVUS matrix transducer...
This paper presents a front-end application-specific integrated circuit (ASIC) that demonstrates the feasibility of inprobe digitization for next-generation miniature 3-D ultrasound probes with acceptable power- and area-efficiency. The proposed design employs a low-power charge-domain ADC that is directly merged with the sample-and-hold delay lines in each subarray, and high-speed datalinks at the...
The multidimensional array is a fundamental data structure that has been widely used in scientific computing, as well as in many big data analytics applications. Distributed multi-dimensional array has been well studied in the High Performance Computing (HPC) platforms; however, little research has been done in the widely-used big data analytics platforms. In this paper, we present an implementation...
In order to solve the global environmental and energy problems, Flux Switching Integrated Starter and Generator (FSISG) was applied to Hybrid Electric Vehicle (HEV) application. The control circuits are vital for the FSISG system, which were designed and studied in this paper. The structure of the control circuits of FSISG system was introduced. Then the experimental studies were carried out based...
EEG classification is an important signal acquisition equipment of brain-interface research and application. In this paper, an improved relevance vector machine (RVM) is proposed to classify four-class motor imagery EEG signals. The original EEG signals are processed by 3–24Hz band-pass filter. Thereafter, EEG feature vectors are extracted from the band-pass filtered EEG signals with one versus one...
In this paper, evolutionary programming algorithm through the mutation operator and the selection strategy to find the optimal individual, used to initialize the BP neural network's weights and threshold value. Through this way, we can improve the training efficiency, speed up the convergence rate, increase the irregularity of the weights and threshold value, avoid BP neural network training into...
With the development of computer control technology and power electronics, six-phase induction motor control system has been widely used in industrial area due to its advantages. Through the study of single-phase induction motor SVPWM control technology, combined with the six-phase induction motor winding structure, a novel six-phase induction motor SVPWM control strategy is proposed and the third...
Software defined network (SDN) designed a separation from Control Plane with Data Plane, which enhanced the centralized processing Controller to make OpenFlow routing table more flexible and programmable. User centric network (UCN) developed an idea of focusing on the desire of users or user groups for the always best experience (ABE), thus requires a controller to schedule bandwidth resources not...
In a previous paper, we proposed an extended ANFIS architecture and showed that interval type-2 ANFIS produced larger errors than type-1 ANFIS on the well-known IRIS classification problem. In this paper, more experiments on both synthetic and real-world data are conducted to further investigate and compare the performance of interval type-2 ANFIS and type-1 ANFIS. For each dataset, interval type-2...
Detecting crack type and crack size is crucial for road maintenance and management. Mobile crowd sensing is a new way to collect the information of cracks on roads. We propose a system named CrackDetector to detect cracks and estimate their types and size with smart phone in this paper. The type of a crack (i.e., horizontal crack, vertical crack, net crack) is determined by a coordinate transmission...
Reliability and safety are extremely important for autonomous driving in real traffic scenarios. However, due to imperfect control and sensing, the actual state of the vehicle cannot be flawlessly predicted or measured, but estimated with uncertainty. Therefor, it is important to consider the execution risk advance in motion planning for a solution with a high success rate. The Space Exploration Guided...
Let Xi, i ∊ V form a Markov random field (MRF) represented by an undirected graph G = (V, E), and V' be a subset of V. We determine the smallest graph that can always represent the subfield Xi, i ∊ V' as an MRF. Based on this result, we obtain a necessary and sufficient condition for a subfield of a Markov tree to be also a Markov tree. When G is a path so that Xi, i ∊ V form a Markov chain, it is...
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