Virtual reality (VR) technology has attracted the attention of architectural practitioners due to its ability allow people interact with proposed design elements through unique and immersive experiences. This study aims at providing a bottom-up decision-making approach, using VR for inhabitant engagement in process historic urban district renovation preserve local culture, improve community interaction, replace printed paper use review. The focuses on Tangzixiang Anhui province, Scheme 1...

Field surveys are an important component of architectural history courses, but they challenging for students with limited resources or geographical constraints. This paper aims to explore the potential virtual reality (VR) technology as a solution this problem by testing its impact on student learning performance in course. Dule Temple, heritage building, is used case study construct VR environment options ground-based free movement modes. A total 102 third-year architecture participated...

In this paper, the formulation of reverse time migration (RTM) is improved for impulse borehole radar imaging in subsurface scenarios with layered media. By fully adopting prior information surrounding media, gating function designed and applied to incident wave field scattering each point, which strengthens correlation between fields domain. The clutters partly caused by multiple reflections different media layers are suppressed due function. A normalized zero-offset cross gated samples...

The drift compensation of gas sensor systems is an important topic in the artificial olfactory community. arisen by multiple factors, i.e., change temperature and moisture, poison effect, manufacture repeatability, so on. It would arise bias, distortion, offset data lead it to be unrecognized. Conventionally, calibration methods hardware level are laborious ineffective, many proposed baseline software not effective enough due loss structure information. In this work, a classifier-level...

In this paper, the formulation of Stolt migration is modified for impulse borehole radar near-field imaging in subsurface scenarios where transceiver widely separated with respect to detection range. The proposed approach consists following aspects. First, locations transmitter and receiver survey are regarded as independent sample dimensions, original set converted an enlarged virtual set. frequency-wavenumber spectrum (FWS) available via multidimensional fast Fourier transform (FFT). Then,...

A novel data acquisition and imaging method based on compressive sensing is utilized for impulse borehole radar (IBR). With the sparse transform that we present IBR systems, only 50% or even less samples are needed to be collected transmitted reconstruct target space, which reduces sampling rate transmission of systems. The simulation experiment results show proposed more robust in noise environment reconstructed spaces have artifacts compared with solutions traditional Stolt migration method.

This paper develops a novel slip estimator using the invariant observer design theory and Disturbance Observer (DOB). The proposed state for mobile robots is fully proprioceptive combines data from an inertial measurement unit body velocity within Right Invariant Extended Kalman Filter (RI-EKF). By embedding into SE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> (3) matrix Lie group, developed DOB-based RI-EKF provides real-time...

Radio frequency interference (RFI) usually makes a great impact on through-wall radar (TWR) using ultrawideband signal to achieve high range resolution. In this paper, phase-coded stepped-frequency (PCSF) waveform is designed improve the anti-RFI performance of TWR, based fact that different initial phase transmitted signals will have no effect receiver response target echoes, and RFI uncorrelated with signals. We present methodology results comparative study TWR PCSF conventional waveform....

In this paper, the formulation of Stolt migration is modified for impulse borehole radar imaging in large nonuniform subsurface scenarios. By applying fast Fourier transform (FFT) to acquisition frequency-wavenumber spectrum (FWS), efficiency surveys improved. First, each exponent basis approximated with a weighted summation several uniform bases. Then, samples same are accumulated generate larger virtual sample set. The FWS set by FFT. Finally, angular frequency interpolation and inverse...

Concerned with the problem of lacking fault samples complex equipments, it studies principle and application negative selection algorithm artificial immune system. The detectors generation mechanism real-valued is introduced. Intuitively, to maximize covering produced by a set detectors, necessary reduce their overlapping not self set. This paper presents an optimization strategy base on re-heating simulated annealing modify position changing number. method can improve effect non-self space....

The hyperbola exhibited from the local target in B-scan of GPR can contribute to estimate propagation velocity and locate target. In this paper, a new method fast extracting hyperbolas apex is presented. based on peak tracing symmetry hyperbolas. was tested experiments, results indicate that it be achieved near real-time.

The clutter reduction is one of the most important problems in ground penetrating radar (GPR) applications. detection performance GPR heavily limited by clutters. In this paper, a novel and simple method based on design symmetry filter, which adapted to B-scan, presented. Compared with average subtraction, SaS two-dimensional digital filter using experimental data, proposed more effective reducing clutters due undulated bounce, soil roughness scattering external anomalies reflections.

An impulse-based single-borehole radar prototype has been developed for well logging. The borehole is comprised of subsurface sonde and surface equipment. armored 7-conductor logging cable used to connect equipment which compatible with the other instruments. performance experiments have conducted in a test field. results show that system capable detecting target 8 meters away from borehole. This employed real oil field depth about 1600 meters. Compared conventional resistivity tools,...

This paper presents the least-square-based nonuniform borehole synthetic aperture radar (SAR) imaging method with cosine accuracy factor for subsurface sensing. Based on Stolt migration, frequency-wavenumber spectrum of data is efficiently approximated in least-square-sense target space generation. The power exponent basis interpolated into several uniform bases factors, and then a virtual sample set larger scale generated approximation process. proposed can give accurate image result at...

In this paper, a sparse planar array optimization method based on genetic algorithm is proposed for 77 GHz high-resolution imaging. The large scale half-wavelength uniform divided into multiple symmetric subarrays, and the 2-D sidelobe of subarray suppressed by approach, which reduces number elements while remains desired azimuth resolution elevation resolution. performance verified several simulation experiments. results show that optimized arrays can achieve an 0.7° 2.3° in field view...

In this study, an efficient deep-learning-driven sparse-target imaging (DLSTI) method was developed for array borehole radar to improve the accuracy of target localization in a subsurface nonuniform media. First, by making use linear superposition and separable characteristics background echo, echo generated with electromagnetic (EM) simulation using prior medium information. The then removed from receiver convex-optimization-based front-end extractor (TEE) obtain raw sparse echo....