We show that an optimal dielectric cladding thickness exists, at which the losses in a metallic nanowire can be entirely compensated with minimal gain. We also propose design guidelines that ensure strong confinement ...
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ISBN:
(纸本)9780977565771
We show that an optimal dielectric cladding thickness exists, at which the losses in a metallic nanowire can be entirely compensated with minimal gain. We also propose design guidelines that ensure strong confinement of SPPs.
We develop approximate analytical models that describe transmission characteristics of plasmonic slot waveguides coupled to resonant-cavity structures. These models provide deeper insight and pave the way for rapid de...
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ISBN:
(纸本)9780977565771
We develop approximate analytical models that describe transmission characteristics of plasmonic slot waveguides coupled to resonant-cavity structures. These models provide deeper insight and pave the way for rapid design optimization of various integrated nanophotonic devices.
The photoluminescence (PL) and decay time at 1.53μm of sputtered Er 0.2 Re 1.8 Si 2 O 7 (Re=Yb, Y) thin films were investigated. The enhancement of the PL at 974nm pumping in the Er 0.2 Re 1.8 Si 2 O 7 film was dem...
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The photoluminescence (PL) and decay time at 1.53μm of sputtered Er 0.2 Re 1.8 Si 2 O 7 (Re=Yb, Y) thin films were investigated. The enhancement of the PL at 974nm pumping in the Er 0.2 Re 1.8 Si 2 O 7 film was demonstrated compared with Er 0.2 Re 1.8 Si 2 O 7 film.
This paper presents our group's latest progress in developing Enunciate - an online computer-aided pronunciation training (CAPT) system for Chinese learners of English. Presently, the system targets segmental pron...
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This paper presents our group's latest progress in developing Enunciate - an online computer-aided pronunciation training (CAPT) system for Chinese learners of English. Presently, the system targets segmental pronunciation errors. It consists of an audio-enabled web interface, a speech recognizer for mispronunciation detection and diagnosis, a speech synthesizer and a viseme animator. We present a summary of the system's architecture and major interactive features. We also present statistics from evaluations by English teachers and university students who participate in pilot trials. We are also extending the system to cover suprasegmental training and mobile access.
We propose an efficient optical coupler to launch free-space signals into a dielectric dielectric waveguide via plasmonic structures with great field enhancement. A plasmonic concentrator composed of a subwavelength s...
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We propose an efficient optical coupler to launch free-space signals into a dielectric dielectric waveguide via plasmonic structures with great field enhancement. A plasmonic concentrator composed of a subwavelength slit surround by periodic grooves is used to access and collect free-space light. The transmitted light is then unidirectional directed into a dielectric waveguide with a plasmonic Bragg reflector and a directional coupler. The free-space optical coupler is useful as it combines the plasmonic structure for optical signal access in subwavelength scale with the ultra-low loss dielectric waveguide for long-distance signal transmission and processing making use of nonlinearity.
This paper proposes and evaluates Self-Organizing Latency-Aware Resource Ensemble (SOLARE), a peer-to-peer self-organizing and self-managing cluster system based upon network coordinates and utility functions. In cont...
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This paper proposes and evaluates Self-Organizing Latency-Aware Resource Ensemble (SOLARE), a peer-to-peer self-organizing and self-managing cluster system based upon network coordinates and utility functions. In contrast to previous works, SOLARE is a fully decentralized clustering algorithm without any central units such as servers, super peers, cluster heads or landmarks. Furthermore, SOLARE allows for adaptability to dynamic network changes by monitoring the utility of a cluster and migrating nodes to other higher-utility clusters when the utility of an existing cluster is low. Quantitative, simulation-driven evaluations show that SOLARE is able to satisfy user demands expressed by utility functions that integrate system parameters in terms of intra cluster latencies and the number of cluster members. Also, we verify the ability of SOLARE to adapt to dynamic network changes through simulation based experiments that consider the number of nodes which migrate into another cluster and average utility value as nodes join SOLARE.
This paper proposes a method for mobile robot exploration based on the idea of frontier exploration which suggests navigating the robot toward the boundaries between free and unknown areas in the map. A global occupan...
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This paper proposes a method for mobile robot exploration based on the idea of frontier exploration which suggests navigating the robot toward the boundaries between free and unknown areas in the map. A global occupancy grid map of the environment is constantly updated, based on which a global frontier map is calculated. Then, a histogram based approach is adopted to cluster frontier cells and score these clusters based on their distance from the robot as well as the number of frontier cells they contain. In each stage of the algorithm, a sub-goal is set for the robot to navigate. A combination of distance transform and A* search algorithms is utilized to generate a plausible path toward the sub-goal through the free space. This way keeping a reliable distance from obstacles is guaranteed while searching for the shortest path toward the sub-goal. When such a path is generated, a B-spline interpolated and smoothed trajectory is produced as the control reference for the mobile robot to follow. The whole process is iterated until no unexplored area remains in the map. The efficiency of the method is shown through simulated and real experiments.
The crossing coupler is introduced to form a microring resonator. The coupling coefficient of the crossing can affect the resonance spectrum significantly based on the model of the coupled mode theory.
The crossing coupler is introduced to form a microring resonator. The coupling coefficient of the crossing can affect the resonance spectrum significantly based on the model of the coupled mode theory.
This paper presents a modern control system for three phase high performance interior permanent magnet motor drives. The control system combines the advantages of vector control and direct torque control and overcomes...
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This paper presents a modern control system for three phase high performance interior permanent magnet motor drives. The control system combines the advantages of vector control and direct torque control and overcomes some of the implementation drawbacks of either of the methods. The system uses a current control loop in connection with a switching table. A brain emotional learning based intelligent controller (BELBIC) is employed in the system which provides excellent performance under different operating conditions. BELBIC is based on the emotion processing mechanism in human's brain providing actions based on sensory inputs and emotional cues. A comprehensive evaluation of an IPM motor performance under the proposed control system proves the effectiveness of the system and its partial superiority over either vector control or direct torque control despite its relatively simple structure.
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