In order to develop a useful system for teaching and learning, the system should be designed for the needs and capabilities of the users for whom they are intended. Before developing any systems a User-Centered Design...
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The electric power is indispensable and its stable supply is always expected. A stable supply needs the real-time observation of load conditions by measurement of power factor. In addition, the various faults have bee...
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Network design problem is usually complicated. Network designers may have to optimize various design objectives simultaneously. This paper considers a multi-objective network design problem for routing wavelength assi...
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We successfully realized phase‐locking of a 2.7‐THz metal‐metal waveguide quantum cascade laser (QCL) to a reference, which is generated from an external microwave signal by applying two stages of frequency multipl...
We successfully realized phase‐locking of a 2.7‐THz metal‐metal waveguide quantum cascade laser (QCL) to a reference, which is generated from an external microwave signal by applying two stages of frequency multiplication. The reference is the 15th harmonic of a signal at 182 GHz, which is produced by a semiconductor superlattice nonlinear device. The signal at 182 GHz is generated by a multiplier‐chain (×12) from a microwave synthesizer at ∼15 GHz. Both QCL laser and reference radiations are coupled into a superconducting NbN hot electron bolometer mixer, resulting in a beat signal, which is fed into a phase‐lock loop. Spectral analysis of the beat signal confirms that the QCL is phase locked. This result is a crucial demonstration for a QCL used for local oscillator and opens the possibility to extend heterodyne interferometers into the far‐infrared range.
This paper presents a novel method of modeling spatial communication activity in wireless sensor network (WSN). We define native aspects of communication in WSN. Focusing on local/global activity dilemma, cooperation,...
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ISBN:
(纸本)9781629934747
This paper presents a novel method of modeling spatial communication activity in wireless sensor network (WSN). We define native aspects of communication in WSN. Focusing on local/global activity dilemma, cooperation, interference, network topology, and optimization aspects. A neighborhood abstraction is defined and we involve three binary relations: subordination, tolerance and collision to describe the cooperation in WSN. Using digital terrain model tools we model communication activity aspects as surfaces, stretched over WSN network. A network topology features are modeled using bare drainage surface. It is a component of a topographic map, which gives a direction towards the base station, determined by a slope of the modeled surface. Modeling node's instant energy level, we construct another surface represents node's instant level of consumed energy. Finally, we construct a drainage surface spread over each node neighborhood as superposition of bare drainage surface, energy consumed and relational surfaces.
In this paper, we present the implementation of an OFDM system based on the TMS320C6416 DSP. Methods for synchronization and channel estimation are shortly described. Structure of the used DSP board, and the interface...
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We have investigated a measurement system for permittivity distribution based on the measured capacitance using a pair of long distance small size electrodes with the shield and arc additional electrodes. However, the...
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The proliferations of terrorism news articles from thousands of different sources are now available on the Web. Summarization of such information is becoming increasingly important. The aim of this paper is to study a...
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We have proposed the voltage-current sensor of resin molded type for measurement of the power factor and harmonics. To grasp the characteristics of the conventional prototype sensor and the problem in its practical us...
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