We propose a systematic way for analyzing gain-recovery dynamics in semiconductor optical amplifiers using a multiple-scale analysis and show that the resulting analytical solution for the amplified pulse agrees well ...
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ISBN:
(纸本)9781557528599
We propose a systematic way for analyzing gain-recovery dynamics in semiconductor optical amplifiers using a multiple-scale analysis and show that the resulting analytical solution for the amplified pulse agrees well with numerical solutions.
Broadcasting in ad hoc networks, widely utilized as a building block for many network layer protocols is prone to broadcast storm problem. This problem necessitates to carefully designate some nodes in the one-hop nei...
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Broadcasting in ad hoc networks, widely utilized as a building block for many network layer protocols is prone to broadcast storm problem. This problem necessitates to carefully designate some nodes in the one-hop neighborhood of the sender as forwarding nodes and reduce broadcast redundancy. In this paper, we propose an algorithm called Dual Covered broadcast with Negative acknowledgements (DCN) which focuses on achieving high delivery ratio in an environment that has high transmission error rate. We make use of negative acknowledgements (NACK) to reduce broadcast collision and achieve enhanced reliability. Overhead caused due to acknowledgements are avoided by allowing the sender to overhear the transmissions from the receiver. Broadcast congestion is alleviated by eliminating the unnecessary duplication of packets, otherwise resulting in Broadcast storm problem. Simulation results show that DCN algorithm improves the reliability of broadcast operation compared to Double Covered Broadcast (DCB) and use lower number of forwarding nodes in the network.
This paper proposes a CSMA/CD-R (Carrier Sense Multiple Access/Collision Detection with Reservation) protocol, designed for wireless network mobile robots under a distributed robot system without any centralized mecha...
This paper proposes a CSMA/CD-R (Carrier Sense Multiple Access/Collision Detection with Reservation) protocol, designed for wireless network mobile robots under a distributed robot system without any centralized mechanism. It employs stations to reserve a communication channel after communication collision for the wireless communication of the distributed robot system. The effectiveness and applicability of the proposed protocol are demonstrated by carrying out computer simulations and real experiments with the develped multi-robot system.
In this paper, the UHF RFID tag antenna which has a SRR as a radiating part and inductively coupled feeding method are analyzed and designed. By using a SRR, the antenna size can be reduced and using an inductively co...
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In this paper, the UHF RFID tag antenna which has a SRR as a radiating part and inductively coupled feeding method are analyzed and designed. By using a SRR, the antenna size can be reduced and using an inductively coupled feeding method, we can obtain a wide bandwidth and a simple matching technique to directly attach to a tag chip. Also equivalent circuit model of the tag antenna is presented and unknown variables are analyzed and checked. Therefore the tag antenna can be designed for various tag chips and frequency ranges.
This paper presents an active hybrid battery/ultra-capacitor based vehicular power system. The stand alone battery system may not be sufficient to satisfy peak demand periods during transients in HEVs. An ultra-capaci...
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This paper presents an active hybrid battery/ultra-capacitor based vehicular power system. The stand alone battery system may not be sufficient to satisfy peak demand periods during transients in HEVs. An ultra-capacitor bank can supply or recapture a large burst of power since it can be used with high C-rates. Active battery/ultra-capacitor hybrid model provides a better solution in terms of efficient power management and control flexibility. Moreover, the voltage of the battery pack can be selected to be less than ultra-capacitor, which will result in cost and size reduction of the battery pack. The power management is provided using a boost and a bidirectional DC/DC converter. The performance of the developed model and its control strategy is tested under various driving cycles. Results are obtained using MATLABreg, Simulinkreg, SimPower-Systemreg, and ADVISORreg platforms based on the mathematical and electrical models of the proposed system to present the effectiveness of the proposed topology.
In order to obtain a good result in the laser welding process, the laser welding technology for manufacturing an automobile body is studied in this research. The robot, the seam tracking system, and CW Nd:YAG laser ar...
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In order to obtain a good result in the laser welding process, the laser welding technology for manufacturing an automobile body is studied in this research. The robot, the seam tracking system, and CW Nd:YAG laser are used for the laser welding robot system. Especially, the development of the laser-stripe sensor is highlighted. The laser-stripe sensor can measure the profile of the welding object and obtain the gap and seam line. Moreover, the working distance of the sensor can be varied. The control scheme of the whole system is also presented. The profile and gap measurement and the seam tracking experiments were carried out to validate the operation of the system.
We propose novel colorless dense wavelength-division multiplexed passive optical networks (DWDM-PON) with a real-time protection capability against the fiber link fault. The feasibility of the proposed scheme is exper...
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We propose novel colorless dense wavelength-division multiplexed passive optical networks (DWDM-PON) with a real-time protection capability against the fiber link fault. The feasibility of the proposed scheme is experimentally verified using carrier distributed DWDM-PON.
We show full 3D simulation and fabrication of an active silicon-based photonic crystal chromatic dispersion compensator with high power efficiency and low power consumption. The device makes use of a novel structure w...
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ISBN:
(纸本)9781557528599
We show full 3D simulation and fabrication of an active silicon-based photonic crystal chromatic dispersion compensator with high power efficiency and low power consumption. The device makes use of a novel structure where optical waveguiding and electrical transport properties can be individually tailored to a large extent.
We discuss the electrical resistivity and thermal stability of smooth thin silver (Ag) films characterized by significantly lower root mean square (RMS) surface roughness, peak-to-valley height distribution, and grain...
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