Precise and accurate localization is important for safe autonomous driving. Given a traffic scenario which has multiple vehicles equipped with internal sensors for self-localization, and external sensors from the infrastructure for vehicle localization, vehicle-infrastructure communication can be used to improve the accuracy and precision of localization. However, as the number of vehicles in a scenario increases, associating measurement data with the correct source becomes increasingly challenging. We propose a solution utilizing the symmetric measurement equation filter (SME) for cooperative localization to address data association issue, as it does not require an enumeration of measurement-to-target associations. The principal idea is to define a symmetrical transformation which maps measurements to a homogeneous function, thereby effectively addressing several challenges in vehicle-infrastructure scenarios such as data association, bandwidth limitations and registration/configuration of the external sensor. To the best of our knowledge, the proposed solution is among the first to address all these issues of cooperative localization simultaneously, by utilizing the topology information of the vehicles. 相似文献
In the recent years the rapid growth of multimedia content makes the image retrieval a challenging research task. Content Based Image Retrieval (CBIR) is a technique which uses features of image to search user required image from large image dataset according to the user’s request in the form of query image. Effective feature representation and similarity measures are very crucial to the retrieval performance of CBIR. The key challenge has been attributed to the well known semantic gap issue. The machine learning has been actively investigated as possible solution to bridge the semantic gap. The recent success of deep learning inspires as a hope for bridging the semantic gap in CBIR. In this paper, we investigate deep learning approach used for CBIR tasks under varied settings from our empirical studies; we find some encouraging conclusions and insights for future research.
Feeding 1–2 g/day of cholesterol protected against ruminal hydrogenation caused a 20–30% drop in the secretion of milk fat
by goats and cows. The effect was observed with goats fed conventional rations or with goats and cows fed rations supplemented
with protected lipids, but was not observed with cows fed conventional rations, or when unprotected cholesterol and protected
β-sitosterol was fed to these animals. The results suggest that this depression in milk fat is due to a decreased uptake of
plasma triacylglycerol fatty acids by the mammary gland, induced by dietary cholesterol. 相似文献
A mesoporous carbon developed from waste tire rubber, characterized by chemical analysis, FTIR, and SEM studies, was used as an adsorbent for the removal and recovery of a hazardous azo dye, Acid Blue 113. Surface area, porosity, and density were determined. The adsorption of the dye over the prepared adsorbent and a commercial activated carbon was achieved under different pH, adsorbate concentration, sieve size, adsorbent dosage, contact time and temperature conditions. Langmuir and Freundlich adsorption isotherm models were applied and thermodynamic parameters were calculated. Kinetic studies indicated that the adsorption process follow first order kinetics and particle diffusion mechanisms are operative. By percolating the dye solution through fixed-bed columns the bulk removal of the Acid Blue 113 was carried out and necessary parameters were determined to find out the percentage saturation of both the columns. Recovery of the dye was made by eluting 0.1 M NaOH through the column. 相似文献
A low-power CMOS reconfigurable analog-to-digital converter that can digitize signals over a wide range of bandwidth and resolution with adaptive power consumption is described. The converter achieves the wide operating range by (1) reconfiguring its architecture between pipeline and delta-sigma modes; (2) varying its circuit parameters, such as size of capacitors, length of pipeline, and oversampling ratio, among others; and (3) varying the bias currents of the opamps in proportion to the converter sampling frequency, accomplished through the use of a phase-locked loop (PLL). This converter also incorporates several power-reducing features such as thermal noise limited design, global converter chopping in the pipeline mode, opamp scaling, opamp sharing between consecutive stages in the pipeline mode, an opamp chopping technique in the delta-sigma mode, and other design techniques. The opamp chopping technique achieves faster closed-loop settling time and lower thermal noise than conventional design. At a converter power supply of 3.3 V, the converter achieves a bandwidth range of 0-10 MHz over a resolution range of 6-16 bits, and parameter reconfiguration time of twelve clock cycles. Its PLL lock range is measured at 20 kHz to 40 MHz. In the delta-sigma mode, it achieves a maximum signal-to-noise ratio of 94 dB and second and third harmonic distortions of 102 and 95 dB, respectively, at 10 MHz clock frequency, 9.4 kHz bandwidth, and 17.6 mW power. In the pipeline mode, it achieves a maximum DNL and INL of ±0.55 LSBs and ±0.82 LSBs, respectively, at 11 bits, at a clock frequency of 2.6 MHz and 1 MHz tone with 24.6 mW of power 相似文献
The objective of present investigation was to formulate hydrogel containing glycyrrhizic acid loaded Ultra deformable vesicles i.e., transfersomes effective against atopic dermatitis. These were formulated using thin film hydration technique and this transferosomal suspension was loaded into a hydrogel base. This was characterized on the basis of parameters like particle size, shape and surface morphology, in vitro release, in vivo studies and skin deposition studies. The optimized formulation showed the in vitro release of 89.8% upto 24?h and following Higuchi’s equation (R2?=?0.971).The data obtained revealed that the formulation is able to be effective against atopic dermatitis. 相似文献
The importance of open and unbuilt neighborhood spaces in residential developments has been established by numerous scholars. Having a diverse nomenclature in varied contexts, these areas are indispensable yet often neglected and designated as leftovers in contemporary planning practice. With their usefulness in the Indian context of socially active and sometimes even intrusive communities, such spaces are rapidly losing their place in present-day residential environments due to the pressure of providing for the rapidly growing population coupled with mass migratory patterns. These neighborhood spaces that impart physical, psychological, and perceptual comfort to residents have been present in spontaneously developed traditional Indian cities due to their inherent order and integrity. Moreover, some contemporary housing environments by eminent designers have also utilized the virtues of well-designed neighborhood environments. This study is a comparative analysis of three selected projects, which aspire to devise suitable methods for contemporary Indian context and achieve neighborhood comfort and an overall sense of belongingness among residents. 相似文献