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As the blooming development of data mining in social computing systems (e.g., crowdsourcing system), statistical inference from crowdsourced data severs as a powerful tool to provide diversified services. To support critical applications (e.g., recommendation), in this paper, we shall focus on the collaborative ranking problems and construct a system of which the input is crowdsourced pairwise comparisons...
This paper presents a concurrent high-efficiency tri-band power amplifier with the continuous class-E mode. The continuous class-E power amplifier can perform high-efficient concurrently at some operational frequencies by manipulating the fundamental and second harmonic impedances of the transistor. After selected the design parameters of the proposed tri-band power amplifier, the output and input...
A novel three-section transmission line based T-type dual-band impedance transformer (DBIT) with its closed-form design equations is proposed in this paper. The proposed impedance transformer could transform two different complex impedances to a resistive load at two arbitrary real frequencies. A section transmission line is employed to transform the two different complex impedances to the same complex...
Most of magnetic encoder ICs are on-axis, and they are generally suitable for inner rotor PMSM, sometimes used in external rotor PMSM. However, in some special occasions, these ICs are not used for the difficulty of mounting, for example, there is an external rotor PMSM with a hollow shaft, which is convenient for passing the control wire. It is difficult to mount these encoder ICs, because there...
According to the requirement of the power factor and the dynamic performance of the asynchronous machine tool field, an asynchronous motor inverter with active power factor correction is proposed. The proposed inverter is a 3kW asynchronous motor drive control platform. At first, the proposed single phase converter with APFC is realized by using the MATLAB/SIMULINK. Then, the boost APFC is designed...
Nowadays electric tools have been widely used in many fields, such as woodworking, home decoration and mechanical maintenance. Permanent magnet (PM) machine have many merits such as high efficiency, high torque density, and high structural reliability. Due to these advantages, PM machine is suitable for electric tools. Firstly, this paper compares two rotor topology including tangential interior PM...
A fault-tolerance control method for an open-winding multi-disc motor capable of being used in wide speed range applications is designed and introduced. The open-winding method is proven to be effective in field weakening to enhance high speed performance. But the dual inverter may increase the chance of hardware function failure. No additional hardware is required to realize the control method. By...
For a growing pool of data-intensive applications, data transfer, rather than processing speed, has emerged as the major bottleneck to performance and energy scalability. In this paper, we propose a novel interleaved logic-in-memory architecture, referred to as MISK, which leverages fine-grained integration of logic functions within dense, 2-D static random-access memory (SRAM) arrays for in-situ...
Magnetic encoder based on giant magnetoresistance effect, also known as GMR-based magnetic encoder, has several distinct advantages over the traditional Hall-effect magnetic encoder such as its simpler structure, higher resolution and sensitivity as well as a better tolerance toward extreme working environment. This paper gives a detail design scheme of a GMR-based magnetic encoder. Finite element...
In this paper, a 5kW novel multistage axial-flux permanent magnet machine (M-AFPM) is analyzed. As a key part of the machine, stator core of silicon steel and SMC are studied by 3D finite element method (FEM) respectively. No-load, full-load, magnetic field distribution, core loss, etc. are calculated. FEM result indicates that SMC-materials have almost equal influence on EMF, magnetic field distribution...
Aiming at the application of fan, pump and compressor load, a cost-effective sensorless drive control system of permanent magnet synchronous motor (PMSM) based on V/f control is proposed and realized in this paper. Aiming at the problem that conventional V/f control cannot maintain the stable operation in middle and high frequency domain and the load fluctuation, a method of adding the speed stabilizing...
This paper presents the design and implementation of a high speed sensorless brushless DC motor (BLDCM) drive with commutation compensation. The back electromotive force (EMF) detection using three phase terminal voltage is implemented to detect the rotor position, in order to filter the high frequency switching signals, a low pass filter is applied in the back EMF detection circuits, the cut-off...
This paper proposes a sensorless field-oriented control(FOC) strategy for Surface-mount Permanent Magnet Synchronous Motor(SPMSM). Firstly, a rotor flux estimation method with a high pass filter is introduced. Secondly, the basic principle of PLL and PI parameters tuning method derivation are demonstrated. And then, the compensation method for the phase shift caused by the high pass filter has been...
In this paper, we propose a fairness-aware energy-efficient power control scheme for device-to-device communications underlaying cellular networks, where multiple D2D pairs reuse the same subchannels allocated to one cellular user. Taking the maximum allowed transmit power and the minimum data rate requirement into accounts, we formulate the fairness-aware energy-efficient power control problem as...
In a passive ultra-high frequency (UHF) radio-frequency identification (RFID) system, when multiple tags select a single time slot to backscatter their signals simultaneously to a reader, the tags will collide with each other. In this case, the slot is a useless slot and the collided tags will re-select other slots to backscatter their signals until no collision happens. However, an MAC-physical (PHY)...
In irregular low density signature-orthogonal frequency division multiplexing (IrLDS-OFDM) random access system, since no uplink scheduling is performed, each user randomly picks one low density signature (LDS) with different density factor, and spreads the symbols with LDS in the time-frequency domain. In this paper, we propose a game theoretical model to describe this non-cooperative uplink multiple...
High-dimensional data are ubiquitous in most real-world research areas, such as machine learning, image processing and so on. Actually, high-dimensional data that belong to the same classes tend to gather in their own low-dimensional subspaces. Recently, many subspace recovery algorithms based on the sparse representation such as Sparse Subspace Clustering (SSC), Low-Rank Representation (LRR) and...
Constructing a panoramic image has been an interesting research problem. Many techniques have been proposed and even implemented to be used as tools for panoramic image generation. However, most of them assume the image acquisition process has been done beforehand, and therefore focus mainly on the image stitching process from the following perspectives, i.e., enhancing image quality, improving performance,...
In this paper, a new 2D cepstral descriptor will be proposed for 3D model retrieval. In the proposed approach, the overlapping subband decomposition will be employed to divide each 2D spectrum into a number of overlapped subbands for further 2D cepstral descriptor extraction. Experiments conducted on the Princeton Shape Benchmark (PSB) database have shown that the proposed 2D cepstral descriptor yields...
The rising awareness of environment protection has increased the need for a transformation of current transport systems to help achieve a low-carbon economy. Hence, this paper aims to develop an optimization model to seek a feasible combination of environmental alternatives that minimizes the emissions of transport fleets. The analytical results of a prescriptive analytics in Taichung city demonstrate...
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