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In this paper, we present the improvement of optical properties of 1×8 arrayed waveguide grating (AWG) de-multiplexer by adding Transmission Star Couplers (TSC) into Free Propagation Region 1 (FPR1) which has refractive index 1.455. It is found that the appropriate value of refractive index of TSC area is 1.460. Using this method, the insertion loss of AWG decreased from 1.79 dB to 1.58 dB while the...
Distributed beamforming technique has been introduced in the wireless sensor network (WANs) in order to increase the transmission range and signal strength of sensor node. The identical data is transmitted to the destination by all nodes which have timing and carrier synchronously. Then, the data transmissions are combined gainfully at the destination. Thus accuracy of reference signal for synchronization...
At present, electronic nose (e-nose) has become a popular tool to classify odor samples in various industries. However, most high-performance e-nose systems are in the form of desktop, thus limiting their uses in many areas of applications where analysis must be performed on site. In this work, we have developed a portable optical-based e-nose that features several advantages over traditional e-nose...
In the recent years, high performance computing (HPC) resources has grown up rapidly and diversely. The next generation of HPC platforms is assembled from resources of various types such as multi-core CPUs and GPUs. Thus, the development of a parallel program to fully utilize heterogeneously distributed resources in HPC environment is a challenge. A parallel program should be portable and able to...
The goal of this study is to equip a mobile service robot with an ability to navigate to the human who commands the robot by speech. This paper proposes a Bayesian approach to sound source localization for speaker tracking module. Based on time delay of arrival (TDOA) features, sound source direction is classified using a naïve Bayesian network. The method requires low computational complexity and...
Nowadays power electronics converter that uses for emulate electrical characteristic V-I curve of renewable dc power source are widely interested in research fields. This paper concerns with a photovoltaic (PV) array simulator using a classical dc/dc buck converter as power stage. The inductor current of the converter is used as control variable that is characterized by digital R-S-T controller, so...
This paper presents a 1×4 asymmetric Y-shaped slit loaded microstrip array antenna. The antenna consists of a rectangular patch with four asymmetric Y-shaped slits at the patch corners and a double thickness of FR4 substrate. This antenna will be most utilized in WLAN applications. A modified array antenna configuration is proposed radiation pattern and gain characteristics to enhancement. The radiation...
This paper presents a smart antenna system using a combination of nonconventional least square (NCLS) optimization and direct data domain least square (D3LS) for direction-of-arrival (DOA) estimation and beamforming, respectively. In the proposed system, NCLS optimization is utilized to estimate DOA of incoming signal first. The estimated DOA is then assisted for initial processing of D3LS in beamforming...
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