In this paper, a novel approach for fabricating low cost capacitive RF MEMS switches using directly photodefinable high dielec.ric constant metal oxides has been developed. In this approach, a radiation sensitive meta...
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In this paper, a novel approach for fabricating low cost capacitive RF MEMS switches using directly photodefinable high dielec.ric constant metal oxides has been developed. In this approach, a radiation sensitive metal-organic precursor is deposited via spin coating and converted patternwise to a high dielec.ric constant metal oxide via ultraviolet exposure. The feasibility of this approach is demonstrated by fabricating bridge-type and cantilever-type switches with a nitride/metal-oxide/nitride dielec.ric film stack. These switches exhibited significantly higher isolation and load capacitances as compared to comparable switches fabricated using a simple silicon nitride dielec.ric.
Nano scale body-tied FinFETs have been firstly fabricated. They have fin top width of 30 nm, fin bottom width of 61 nm, fin height of 99 nm, and gate length of 60 nm. This Omega MOSFET shows excellent transistor chara...
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Nano scale body-tied FinFETs have been firstly fabricated. They have fin top width of 30 nm, fin bottom width of 61 nm, fin height of 99 nm, and gate length of 60 nm. This Omega MOSFET shows excellent transistor characteristics, such as very low subthreshold swing, Drain Induced Barrier Lowering (DIBL) of 24 mV/V, almost no body bias effect, and orders of magnitude lower I SUB/ID than planar type DRAM cell transistors.
Estimation of the number of clusters is an essential processing step for various applications. Existing approaches search for an optimal solution by computing and comparing a validity measure for all feasible configur...
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Estimation of the number of clusters is an essential processing step for various applications. Existing approaches search for an optimal solution by computing and comparing a validity measure for all feasible configurations, and tend to under-estimate the number of clusters incorrectly. In this paper, we propose a fast and robust method to estimate the number of clusters without adopting the exhaustive search. Our sch.me first extracts the relationship of neighboring features, and then uses this information to partition the clusters. The superb performance of the method is verified by the simulation results in determining the number of texture segments in the textured images.
This paper proposes a DFE (Decision Feedback Equalizer) equalizer with an error feedback filter using the Multi-Modulus Algorithm (MMA). The proposed equalizer has been designed for 64/256 QAM constellations. The exis...
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This paper proposes a DFE (Decision Feedback Equalizer) equalizer with an error feedback filter using the Multi-Modulus Algorithm (MMA). The proposed equalizer has been designed for 64/256 QAM constellations. The existing MMA equalizer uses two transversal filters or feedforward and feedback filters, while the proposed equalizer uses feedforward, feedback and error feedback filters to improve the channel adaptive performance and to reduce the number of taps. The architecture has been modeled by VHDL and logic synthesis has been performed using the 0.25 μn Faraday CMOS standard cell library. The total number of the gates is about 190,000 gates. The proposed equalizer operates at 15 MHz and provides a symbol rate up to 64 Mbps which is higher than the DOCSIS recommendation.
Since the elec.ronic processing bottleneck that the single control channel architecture introduce is high, we propose a new WDM control architecture, for WDM star-coupled photonic networks, to overcome this problem. A...
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ISBN:
(纸本)9608052866
Since the elec.ronic processing bottleneck that the single control channel architecture introduce is high, we propose a new WDM control architecture, for WDM star-coupled photonic networks, to overcome this problem. Also the proposed network architecture except for reducing the headers elec.ronic processing bottleneck at each station, restricts data channel collision. We examine a network model of finite population and finite number of tunable receivers(servers) for two multiple access protocols: 1) In asynchronous transmission protocol the system is modeled as an F-server loss system and is applied the Erlang-B formula for performance loss evaluation. 2) In the synchronous transmission protocol we develop and analyze a queuing model of the network to obtain the queue length distribution and loss probabilities at the receiving sides of the stations. A rigorous method is developed to examine the receiver collision phenomenon and to evaluate the system performance.
Multispectral remote sensing data are obtained by using high resolution imaging sensors. Such data involves some problems. For example, the large number of classes, complex statistical distribution of these classes, a...
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Multispectral remote sensing data are obtained by using high resolution imaging sensors. Such data involves some problems. For example, the large number of classes, complex statistical distribution of these classes, and the smallness of the training data are among these. A new learning algorithm called self-organizing map, linear support vector machine decision tree (SOM-LSVMDT) with optimized class separability was developed to help solve complex remote sensing classifications problems. The method consists of a clustering part and a binary tree with linear support vector machine at all tree nodes. The proposed algorithm also generates a given number of clusters such that the classes chosen in each cluster are optimized in terms of a separability measure. The SOM -LSVMDT can also minimize problems associated with rare events. The performance of the SOM-LSVMDT algorithm was evaluated on a comparative basis with linear support vector machine decision tree (LSVMDT) algorithm, using three remote sensing data sets from the Colorado region. The SOM-LSVMDT was observed to yield better performance than the LSVMDT.
A technique for the detection of buried landmines, which uses a seismic probing signal in conjunction with a non-contact radar-based surface displacement sensor, has been studied for several years at Georgia Tech. Lab...
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A technique for the detection of buried landmines, which uses a seismic probing signal in conjunction with a non-contact radar-based surface displacement sensor, has been studied for several years at Georgia Tech. Laboratory experiments and numerical models have indicated that this technique shows great promise for imaging a large variety of mine types and burial scenarios. In order to develop a detection system based on this technique, recent studies have focused on transitioning the experimental work from laboratory models to realistic field environments, which poses several challenges for system development. Unknown soil properties at field sites as well as the presence of local inhomogeneities, vertical stratification, and surface variations make the propagation and the modal content of the seismic probing signal more difficult to predict. This complicates the processing required to image buried mines. The small-scale surface topography and naturally-occurring ground cover impede the function of the system's non-contact sensor, which must be capable of looking through the ground cover and spatially averaging its measurement over the irregular surface. A prototype detection system has been tested at several field sites with widely disparate soil properties. Problems were encountered that required modifications to the system sensor, scanning technique, and signal processing algorithms. Following these changes, system performance comparable to that observed in laboratory models was demonstrated during field testing.
This paper proposes a stochastic approach to estimate the occlusion and disparity fields of stereoscopic images. The fields are estimated by the Bayesian maximum a posteriori (MAP) framework and Markov random field (M...
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This paper proposes a stochastic approach to estimate the occlusion and disparity fields of stereoscopic images. The fields are estimated by the Bayesian maximum a posteriori (MAP) framework and Markov random field (MRF) models. The occlusion field model is based on the stochastic observation that the probability distribution in MAP estimator is relatively unstable and uniform at occluded regions. The occlusion is explicitly modelled as MRF, and is estimated in an energy optimization method called stochastic diffusion. The detected occluded region is compensated for the re-estimated disparity field in the same stochastic diffusion and the dynamic programming approach. Experimental results show good occlusion detection and disparity estimation. These results show the novel stochastic approach is suitable for occlusion detection and disparity estimation.
We propose a novel buffer sch.me for the cross-coupled differential Voltage-Controlled-Oscillator (VCO) design. Transformers are used for the new buffer configuration. The primary coil of the transformer is the induct...
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We propose a novel buffer sch.me for the cross-coupled differential Voltage-Controlled-Oscillator (VCO) design. Transformers are used for the new buffer configuration. The primary coil of the transformer is the inductor of the LC resonator, and the oscillation signal is extracted through the secondary. We also implement the differential VCO using the conventional buffer, and compare the performance with the VCO using transformer buffer. With transformer buffers, we achieve 5 times efficiency enhancement and 9dBc more harmonic suppression than the conventional structure. The conventional type VCO shows the oscillation frequency of 4.4-5.4 GHz with approximately 0dBm output power using a total current of 15mA. The VCO using transformer buffer shows 4.7-5.1 GHz with 6.5 ±1dBm output power using only 10mA for the cross-coupled core. The 2nd harmonic suppression of each VCO shows -10dBc and -19dBc, respectively. Both show the phase-noise of about -111dBc/Hz at 1MHz offset. To the best of our knowledge, this is the first demonstration of enhancing efficiency and linearity in a VCO using transformer as a buffer stage.
We analyzed the performance of 1xEV-DO packet sch.duling algorithm and proposed the three kinds of sch.duler considering QoS. Three packet sch.dulers aim at the minimum delay, minimum data rate, and maximum revenue, r...
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ISBN:
(纸本)0889863989
We analyzed the performance of 1xEV-DO packet sch.duling algorithm and proposed the three kinds of sch.duler considering QoS. Three packet sch.dulers aim at the minimum delay, minimum data rate, and maximum revenue, respectively. They were compared with proportional fair sch.duler in EV-DO simulator. EV-DO simulator is made using data measured at commercialized 1xEV-DO service region. Performance of the proposed packet sch.dulers was better than that of the proportional fair sch.duler in each aiming aspects. Difference of capacity by sch.duling algorithm is negligible. Using minimum delay supporting algorithm, time-sensitive traffic could be maintained with less delay than target delay criteria in spite of heavy traffic condition. Erlang capacity of 1xEV-DO can be improved by adapting minimum delay supporting sch.duler.
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