In this paper, we propose a person annotation overlay system using a wearable computer for augmented reality environment which allows the user to recognize an unknown person. The system uses a combination of color and...
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In this paper, we propose a person annotation overlay system using a wearable computer for augmented reality environment which allows the user to recognize an unknown person. The system uses a combination of color and edge information to detect the face. Then, the system is applied to recognize multiple persons based on the face dictionary. Experimental results show that the proposed system is applicable to a visitor's guider.
This paper investigates the design and application of data magnitude modulation to reduce power amplifier back-off for QPSK and OQPSK modulations for small satellite Earth stations. The coefficients for data magnitude...
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This paper investigates the design and application of data magnitude modulation to reduce power amplifier back-off for QPSK and OQPSK modulations for small satellite Earth stations. The coefficients for data magnitude modulation are obtained by using an iterative design loop. The parameters of this loop are tuned to obtain maximum gain. Roll-off factors from 10% to 100% are considered, with emphasis on small roll-off values for increased bandwidth efficiency. It is shown that a gain of almost 6dB can ideally be obtained for a roll-off factor of 10%. Error correction coding is used to compensate for the increased sensitivity to noise of the magnitude modulated data. The loss due to this increased sensitivity is reduced from almost 5.5dB to 1.2dB for a roll-off factor of 10% by using high rate product codes, thus giving an overall gain of 4.8dB. Trade offs between spectral regrowth and implementation are addressed.
Micromachined inductors with sub-mm profiles and comparable elec.rical performance to thicker, commercially-available surface-mount devices, have been fabricated and characterized for low MHz DC-DC converters. The fab...
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Micromachined inductors with sub-mm profiles and comparable elec.rical performance to thicker, commercially-available surface-mount devices, have been fabricated and characterized for low MHz DC-DC converters. The fabrication approach involves micron-scale lamination of nickel-iron cores, combined with 3D-micronachined copper windings. The dimensions of the fabricated inductor are 11.5 mm × 5.7 mm × 0.65 mm, and the DC resistance is 190mΩ. Use of this inductor in a prototype DC-DC boost converter circuit (6V - 9V) yielded 1.6 W power output at 84% efficiency.
In this paper we consider TCP based applications that use bandwidth guarantees, but can also benefit from any additional best-effort service offered by the network. We show that default TCP cannot offer such applicati...
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In this paper we consider TCP based applications that use bandwidth guarantees, but can also benefit from any additional best-effort service offered by the network. We show that default TCP cannot offer such applications the aggregate throughput offered by the two services. We propose an adaptation of TCP called GTCP that uses changes to TCP's congestion control mechanisms to provide the optimal aggregate throughput. GTCP does not require any additional implementation overheads, and does not change the TCP receiver. Through simulations we show that GTCP achieves significantly better performance than default TCP in the target environment.
The diffusion behavior of Si adatoms, during selec.ive epitaxial growth (SEG) of Si, in a cold wall ultrahigh vacuum chemical vapor deposition (UHV-CVD) system was investigated. The distributions of the increase in Si...
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The diffusion behavior of Si adatoms, during selec.ive epitaxial growth (SEG) of Si, in a cold wall ultrahigh vacuum chemical vapor deposition (UHV-CVD) system was investigated. The distributions of the increase in Si growth rate on the Si (100) surface near the edge of (311) facet were obtained at various growth temperatures. The surface diffusion lengths of Si adatoms on the (100) surface were derived from the distribution using a simple diffusion model. The activation energy for diffusion of Si adatoms was calculated to be 1.4 eV, which was relatively higher than previous results.
This research describes the design of a fully integrated fractional-N frequency synthesizer for the local oscillator in IMT-2000 system using 0.18-μm CMOS technology and 1.8-V single power supply. The designed fracti...
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This research describes the design of a fully integrated fractional-N frequency synthesizer for the local oscillator in IMT-2000 system using 0.18-μm CMOS technology and 1.8-V single power supply. The designed fractional-N synthesizer contains following components. Modified charge pump uses active cascode transistors to achieve the high output impedance. A multi-modulus prescaler has modified CML D flip-flop with additional diode-connected transistors for short transient time and high frequency operation. And phase-frequency detector, integrated passive loop filter, LC-tuned VCO tuning from 1.584 to 2.4 GHz at 1.8-V power supply are contained. Finally, designed frequency synthesizer provides 5 MHz channel spacing with -122.6 dBc/Hz at 1 MHz in the WCDMA band and total output power is 28-mW.
MEMS technology can be utilized for the fabrication of magnetic structures in multiple frequency ranges, ranging from low-MHz metal-core devices for DC-DC converters to high-frequency dielec.ric or air core devices fo...
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ISBN:
(纸本)0780376471
MEMS technology can be utilized for the fabrication of magnetic structures in multiple frequency ranges, ranging from low-MHz metal-core devices for DC-DC converters to high-frequency dielec.ric or air core devices for RF application. They can also be fabricated in multiple locations: integral with silicon chips;in the interconnect layer between chip and board;and directly on the printed wiring board, in order to yield ultracompact magnetic microsystems. This paper describes examples of each of these fabrication approaches: high frequency dielec.ric-core inductors for CMOS power amplifiers integrated on-chip;high-frequency air-core inductors fabricated within the interconnect layer between chip and board;and low-frequency metal-core inductors for DC-DC power conversion.
Ozone has been used widely for the treatment of water, decolorization and disinfection, etc., because of its strong oxidization. It is well known that silent disch.rge plasma have become one of the powerful methods fo...
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Ozone has been used widely for the treatment of water, decolorization and disinfection, etc., because of its strong oxidization. It is well known that silent disch.rge plasma have become one of the powerful methods for ozone production since the pioneering work. The efficiency of ozonizer using silent disch.rge plasma is very low compare with the theoretical value. Therefore, many researches have been carried out in order to improve the efficiency of ozonizers. But we cannot expect to improve the efficiency without changing the process of ozone generation. To improve the ozone yield, a new type of multi-disch.rge ozonizer is proposed that it can be consisted with three kinds of superposed silent disch.rge type ozonizer in accordance with appling method of power source which has 180 degree phase difference. A superposed disch.rge type ozonizer is equipped with three elec.rodes( the central, internal and external elec.rodes ), and it is composed of two disch.rge spaces( disch.rge space between central elec.rode and internal elec.rode, disch.rge space between internal elec.rode and external elec.rode ). Ozone is generated by overlapping of each superposed disch.rge type ozonizer, which silent disch.rge plasma come from two disch.rge spaces respectively. At the moment, disch.rge and ozone generation characteristics of each superposed disch.rge type ozonizer were investigated in accordance with quantity of supplied gas, the number and shape of superposed disch.rge type ozonizer. In results, ozone generation characteristics of 17185[ppm] and 783[g/kwh] were obtained.
The Self-Organizing Map (SOM) is an efficient tool for visualizing high-dimensional data. In this paper, an intuitive and effective SOM projection method is proposed for mapping high-dimensional data onto the two-dime...
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The Self-Organizing Map (SOM) is an efficient tool for visualizing high-dimensional data. In this paper, an intuitive and effective SOM projection method is proposed for mapping high-dimensional data onto the two-dimensional SOM structure with a growing self-organizing map. In the learning phase, a growing SOM is trained and the growing cell structure is used as the baseline framework. After the learning phase, the new projection method is used to map the input vector so that the input data is mapped to the structure of the SOM without having to plot the weight values, resulting in easy visualization of the data. The projection method is demonstrated on two data sets with promising results and a significantly reduced network size.
In this paper, we propose the use of vertical-Bell Labs layered space-time (V-BLAST) detection for orthogonal frequency division multiplexing code division multiplexing (OFDM-CDM) systems. Considering the properties o...
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In this paper, we propose the use of vertical-Bell Labs layered space-time (V-BLAST) detection for orthogonal frequency division multiplexing code division multiplexing (OFDM-CDM) systems. Considering the properties of the V-BLAST detection as well as the frequency diversity from CDM, we propose a new CDM transform matrix to improve the performance of V-BLAST detection of OFDM-CDM signals. The V-BLAST detection of OFDM-CDM signals is also applied in multiple antenna systems. Simulation results show that we can achieve significant performance improvement using the V-BLAST detection sch.me and the proposed CDM transform matrix for OFDM-CDM systems.
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