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Electromagnetic torque can be used to form a model reference adaptive system (MRAS) to achieve online identification of rotor time constant in an induction motor drive. The steady-state torque error caused by rotor time constant error is established in this paper. Based on the steady-state analysis, the converging relationship in the MRAS is found out to be lost for some operating points. Then the...
Taiwan is a country with fairly high internet and smart phone penetration. By 2014, more than 70% of Taiwanese over the age of 15 owned a smart phone. Using Facebook online or via mobile internet has gradually become an accepted innovation for most Taiwanese, especially for the new generation. Among Taiwan's population of 23 million populations, there are 18 million Facebook (FB) users. Some Taiwanese...
The interface between accessory insulation and cable insulation suffers not only bulk electric stress along cable radial direction, but also interfacial electric stress along cable axial direction. The above orthogonal electric stress makes the interfacial space charge property complex. In this paper, cross-linked polyethylene (XLPE) and silicone rubber (SIR) were selected to form a laminate with...
Alpha-fetoprotein (AFP) is a typical tumor marker in early diagnosis. Highly specific detection of the AFP was demonstrated using AlGaAs/GaAs high electron mobility transistors (HEMTs). Anti-AFP antibody was immobilized to the Au-coated gate area of the HEMT by a covalent modification method. To avoid any nonspecific binding, the gate was blocked by bovine serum albumin after the reduction of the...
Face recognition is an important research field of pattern recognition.Up to now,it caused researchers great concern from these fields,such as pattern recognition,computer vision,and physiology,and so on.Various recognition algorithms have been proposed. Generally,we can make sure that the performance of face recognition system is determined by how to extract feature vector exactly and to classify...
We present the design and placement of system for light monitoring in museums based on wireless sensor networks (WSN). A two-tiered sensor network architecture is formed according to the real light environmental requirements. The proposed system satisfy the requirement from nodes with different function by providing respective hardware structures including sensor nodes (SNs), aggregation nodes (ANs)...
RFID is regarded as a link between the virtual world and the real world, and it's a key problem to acquire RFID-related information effectively. EPCglobal proposed a service called ONS to solve this problem, but ONS has weakness in the granularity of resolving, data manageability, application flexibility and security. This paper gives detailed analysis of these weaknesses and introduced a new RFID...
With the explosive development of next generation wide-band wireless communication technique, the bandwidth is no longer the bottleneck of the wireless video transmission. Energy consumption is the biggest concern now.In this paper, an energy efficient video transmission scheme with the combination of adaptive modulation and power control is propsosed for the fading channel. In this scheme, based...
In the state-of-the-art wireless communication system, the energy consumed by RF front-end is always more than that of digital sections. As a result, we must minimize it to design energy-quality wireless systems. In this paper, we update our former work on RF frontend energy model and minimize the energy consumption in RF circuit by adjusting the base-band parameters, such as modulation level, data...
With the explosive development of wireless communication technology, more and more implanted medical devices appear in everyday life. Because of the limited energy resource in implanted devices, the energy-quality wireless system design is the biggest challenge. In this paper, we update our former system level energy model and make it suitable for implantable medical communication system. In the new...
A novel space-time block coding (STBC) scheme for four transmit antennas is proposed based on the binary phase shift keying (BPSK) constellation modulation. The new scheme achieves full diversity full rate. And it also can achieve linear decoding at receiver, so the decoding complexity at receiver is greatly reduced. Because the scheme can achieve full diversity, good performance can be obtained not...
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