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In this paper, a fully integrated 24GHz integer-N PLL for a 60GHz wireless transceiver is presented. A VCO with tail-feedback technique is used to improve the phase noise by modulating the tail current, and a switched varactor array is also adopted together with a switched capacitor array to compensate the variation of KVCO over different bands. Moreover, benefiting from the careful optimization of...
An interval type-2 fuzzy logic controller using the switching type-1 fuzzy Takagi-Sugeno model is presented for the position control of wheeled mobile robot. The control gains for the switched regions are determined using linear quadratic regulator approach. The blending of the local controllers based on the interval type-2 design scheme yields the final motion commands for the wheeled mobile robot...
We address the problem of estimating the real-time nature of traffic flows in data center networks, using the light-weight SNMP data. Unlike the problem of estimating the traffic matrix (TM) across origin-destination (OD) pairs in ISP networks, the traffic flows across servers or ToR (Top of Rack) switch pairs in data center networks are notoriously more irregular and volatile. Although numerous methods...
In Cyber-Physical system (CPS), different wireless technologies are used, which results in cross-technology communication interference. Specifically, ZigBee networks share the 2.4GHz ISM band with WiFi but have much lower transmission power. Thus, the ZigBee networks inevitably suffer the interference from WiFi Networks. This paper focuses on the locality of WiFi interference and proposes an interference...
Fuel cell(FC) stack is the power source of fuel cell electric vehicles. Its output current and power usually need to be controlled during testing. Electronic load controller(ELC) has often been introduced in FC testing system to control the DC bus. The desired characteristics of such loads include high power, high reliability, high speed of dynamic response and low cost. In this paper, a high performance...
In this paper we study the characterization of asymptotic stability for discrete-time switched linear systems. We first translate the system dynamics into a symbolic setting under the framework of symbolic topology. Then by using the ergodic measure theory, a lower bound estimate of Hausdorff dimension of the set of asymptotically stable sequences is obtained. We show that the Hausdorff dimension...
In this paper, adaptive dynamic coupling control is considered for hybrid joint, which could be switched to either active (actuated) or passive (under-actuated) mode, for human-symbiotic wheeled mobile manipulators. Based on Lyapunov synthesis, adaptive coupling control using physical properties of wheeled mobile manipulators proposed for passive hybrid joints ensures that the system outputs track...
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