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Mechanism of four-way jet-pipe valve is analyzed in detail by dividing the entire process into two stage, including stream jetting and stream receiving processes. Mathematical model of the whole working process of four-way jet-pipe valve is obtained based on the Bernoulli's equation. Receiving area of symmetric receivers varying along the jet nozzle deflection is deduced according to geometry. By...
This paper presents a low cost high-speed infrared (IR) scanning system for detecting a flying ball. The system adopts a multi-scanline method using IR light-emitting diodes (LEDs) and photo-transistors (photo-TRs) arranged in straight lines on a rectangular frame. In order to avoid IR light interference, we put screens on receiver modules and drilled holes on photo-TRs to improve the feature of the...
This paper represents the characteristics of RMS delay spread according to distance between a transmitter and receiver with measurement results about 28 and 38 GHz at urban low-rise environments, line-of-sight(LOS) conditions. The measurement site, urban low-rise is defined at ITU-R Rec. P.1411-8. When we measured the delay spread, we used a wideband channel sounder and omnidirectional antenna for...
This paper proposes simple structure of a receiver for blind communication system in impulsive noise environment, because the noise causes significant performance degradation when impulse component occurs. In conventional blind receiver, an equalization algorithm to overcome impact of the faded channel and a demodulator exist. However, the conventional receiver provides poor performance when the received...
Machine-to-machine communications (M2M) provide a promising solution for accurately collecting real-time status information of primary equipment in substations. However, the system quality of service (QoS) might be severely degraded by the high-amplitude impulsive noise produced by primary equipment. In this paper, we firstly propose a multi-antenna M2M communications based architecture for substation...
At present, there are relatively more precise pHEMT models available for computer-aided design, and they are frequently compared to each other. However, such comparisons are mostly based on absolute errors of drain-current equations and their derivatives. In the paper, a novel method is suggested based on relative root-mean-square errors of both drain current and its derivatives up to the third order...
The choice of channel propagation model used for the simulation-based study of Vehicular Ad hoc NETworks (VANETs) plays a key role in the accuracy of conclusions drawn about the performance of applications proposed for these networks. Relying on simplistic channel models, as frequently practised in previous works, leads either to pessimistic or optimistic conclusions. In the view of this, in this...
The reliability of an indoor localization system is often limited by the capability of the systems of distinguishing the line-of-sight signals in environments with multipath. Besides, estimating the height of the target can be challenging due to dilution of precision (DOP) and non line of sight (NLOS) situations. However, the reflections can be used to infer information about the scenario. We present...
Indoor positioning with Pseudolites consists of deploying a network of terrestrial transmitters which have the same function as the Global Navigation Satellite Systems (GNSS) outdoor. In this paper, we propose an algorithm that allows carrying out sub-metric positioning using precise carrier phase measurements for a dynamic receiver. During the motion, the measured carried phases are changing according...
In the working process of a four-way jet-pipe valve, the wedge between the two receiving holes distributes the jet stream into two holes of the receiver, with the stream impinges on the receiver, the wedge gets thinner and radius of the receiving holes get enlarge for long time eroding. Characteristics of the four-way jet-pipe valve changes with the erosion. Mathematical model of is built in detail...
Indoor positioning is a key technology that enables the development of various smart and autonomous indoor applications. In recent years, wireless device is considered a promising technology enabler for indoor positioning despite facing various problems in the form of spatial, temporal, and device variation. Here we present a survey of problems in wireless-based indoor positioning and the state-of-the-art...
Appropriate signal model derivation for transmitter and receiver can achieve side lobe reduction in phased array antenna and can also be used to accurately determining direction of arrival (DOA). Dolph-Chebyshev array structure is used for null placing in the antenna radiation pattern. This structure ensures nulls have been placed at proper positions to jam the interferers. For this purpose, interferers...
This research giving up new concept for heat flux distribution improvement to SOLO 161 Stirling engine receiver. Stirling engine receiver need some stable heat flux, so the system could operate optimally until 9–10 kWel. Eurodish system operated stirling engine with single parabolic dish, located above the parabolic reflector. This paper developed a new design using dual parabolic dish with Gregorian...
Reflections in high-speed busses can corrupt signal measurements when the probe location is away from the DUT. This paper presents a methodology to remove such reflections. A mathematical formulation of the problem is presented along with solutions to commonly encountered topologies.
We proposed an IR-based facial expression tracking sensor for Head-Mounted Displays(HMD). The proposed sensor uses lateral propagation characteristics of IR light on human skin to capture the degree of compressed or stretched deformations of facial skin. We derived a semi-empirical equation modeling the lateral propagation characteristics of vertically incident IR light into human skin, with parameters...
By combining a pressure sensor measurement with a three-dimensional vector sensor measurement on a moving platform, it is shown that by including the motion in the signal model, a significant performance improvement in the estimation of the polar angles of the incoming signal is achieved by the exploitation of the bearing information in the Doppler. The method considers the four outputs from a Pressure-Vector...
Ocean analyses, forecasts and ensembles characterizing oceanographic uncertainty are becoming widely available. Acousticians are interested in the impacts of oceanographic variability (temporal and spatial) and uncertainty on acoustic propagation, however, it is very time consuming to compute acoustic propagation along many potential paths for multiple sensors, over a geographic area for many analysis...
Contactless power transfer (CPT) has demonstrated its ability as a safe, efficient and convenient way for electric vehicle (EV) charging systems by providing acceptable power levels with tolerance to misalignments. The magnetic design of the primary and secondary coupler is one of the most critical parts of a CPT system design. This paper investigates various configurations of loosely coupled magnetic...
Room transfer function (RTF) is the room response observed at a particular listening point due to an impulse generated from an omnidirectional point source. Typically, measured RTFs in practice are often erroneous due to the directivity of the measurement loudspeaker. This paper formulates a spherical harmonic based parameterization of the room response for a directional loudspeaker, and provides...
One of the most challenging control problems in parabolic solar collector consists in forcing the outlet oil temperature to track a desired reference, due to the complexity of the PDE model governing the temperature evolution in this latter. In this paper, we propose an efficient and elegant method inspired from the functioning principle of the zipper as well as the lyapunov stability theory to reach...
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