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81.
Evidently, Intelligent Transport System (ITS) has progressed tremendously all its way. The core of ITS are detection and recognition of traffic sign, which are designated to fulfill safety and comfort needs of driver. This paper provides a critical review on three major steps in Automatic Traffic Sign Detection and Recognition(ATSDR) system i.e., segmentation, detection and recognition in the context of vision based driver assistance system. In addition, it focuses on different experimental setups of image acquisition system. Further, discussion on possible future research challenges is made to make ATSDR more efficient, which inturn produce a wide range of opportunities for the researchers to carry out the detailed analysis of ATSDR and to incorporate the future aspects in their research. 相似文献
82.
83.
G. D. Goutham Simha Shriharsha Koila N. Neha M. A. N. S. Raghavendra U. Sripati 《Wireless Personal Communications》2017,97(4):5003-5030
In this paper, a new variant of Spatial Modulation (SM) Multiple-Input Multiple-Output (MIMO) transmission technique, designated as Redesigned Spatial Modulation (ReSM) has been proposed. In ReSM scheme, a dynamic mapping for antenna selection is adopted. This scheme employs both single antenna as well as double antenna combinations depending upon channel conditions to combat the effect of spatial correlation. When evaluated over spatially correlated channel conditions, for a fixed spectral efficiency and number of transmit antennas, ReSM exhibits performance improvement of at least 3 dB over all the conventional SM schemes including Trellis Coded Spatial Modulation (TCSM) scheme. Furthermore, a closed form expression for the upper bound on Pairwise Error Probability (PEP) for ReSM has been derived. This has been used to calculate the upper bound for the Average Bit Error Probability (ABEP) for spatially correlated channels. The results of Monte Carlo simulations are in good agreement with the predictions made by analytical results. The relative gains of all the comparison plots in the paper are specified at an ABER of 10?4. 相似文献
84.
During the last century natural fibers are used as reinforcement in polymer composite has been continuously growing in the composite industry. This polymer matrix composite has wide range of application in hostile environment where it is exposed to external attacks such as solid particle erosion. The mechanical properties of different polymer composites are also most important characteristics. An attempt has been made to compare the mechanical and tribological properties of the both biowaste wood apple and coconut shell particulate polymer matrix composite. The results show that maximum flexural strength is obtained 78.19 MPa for wood apple shell and 68.25 MPa for coconut shell at 15 wt% filler content. The wood apple particulate composite shows best erosion and mechanical properties than coconut particulate composite. POLYM. COMPOS., 35:180–185, 2014. © 2013 Society of Plastics Engineers 相似文献
85.
This article explores the application of spray drying technique to produce microparticles of poly(D ,L ‐lactide‐co‐glycolic acid) (PLGA), as well as di‐block copolymer of polylactic acid (PLA) and polyethylene glycol (PEG) (PLA‐PEG), containing zidovudine (AZT), an anti‐HIV drug, to achieve its controlled release over an extended period of time. Of the two polymers studied, PLGA is hydrophobic, whereas PLA‐PEG is hydrophilic and the drug, AZT is water‐soluble. Formulations were developed containing 10 and 25 wt % of AZT giving encapsulation efficiencies (EE) of 66 to 86% for PLGA and 90 to 94% for PLA‐PEG di‐block copolymer. All the formulations were characterized by Fourier transform spectroscopy (FTIR) to investigate the interaction of AZT with polymers and to characterize PLA‐PEG. NMR was also employed to confirm the formation of PLA‐PEG. X‐ray diffraction was used to understand the molecular level dispersion of AZT within the polymeric matrices, while differential scanning calorimetry was employed to assess thermal properties. Scanning electron microscopy was employed to understand the surface morphology of AZT‐loaded microparticles. In vitro release experiments performed in pH 7.4 buffer media extended the release of AZT up to 125 h with PLGA, whereas 30 h were required for releasing AZT through PLA‐PEG microparticles. Cumulative release data were fitted to an empirical equation to understand the nature of release characteristics. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci 000: 000–000, 2011 相似文献
86.
Raghavendra R. Bellew P. Mcloughlin N. Stojanovic G. Damnjanovic M. Desnica V. Zivanov L. 《Electron Device Letters, IEEE》2004,25(12):778-780
This letter describes the design, modeling, simulation, and fabrication of novel integrated passive devices (IPDs). These IPDs, comprising of a cofired multilayered varistor and inductor, have been developed in the ceramic coprocessing technology. The equivalent model of the new structures is presented, suitable for design and circuit simulations. The fabrication method, new design of structures and patented materials of these devices lead to improved characteristics suitable for application in high-frequency suppressors. The IPDs were tested in the frequency range of 1 MHz-3 GHz using an Agilent 4287A RF LCR meter. The measurements confirm the validity of the proposed model. 相似文献
87.
Computer systems with large numbers of processors pose serious reliability problems. One solution is to build redundant communication paths and dynamic reconfiguration into network designs. 相似文献
88.
Hwa-Chun Lin Raghavendra C.S. 《Parallel and Distributed Systems, IEEE Transactions on》1996,7(3):301-307
This paper presents an accurate analytical model for evaluating the performance of the join the shortest queue (JSQ) policy. The system considered consists of N identical queues each of which may have single or multiple servers. A birth-death Markov process is used to model the evolution of the number of jobs in the system. Our results show that this method provides very accurate estimates of the average job response times 相似文献
89.
Computation time for various primitive operations, such as broadcasting and global sum, can significantly increase when there
are node failures in a hypercube. In this paper we develop nearly optimal algorithms for computing important basic problems
on a faulty SIMD hypercube. In an SIMD hypercube, during a communication step, nodes can exchange information with their neighbors
only across a specific dimension. Our parallel machine model is an n-dimensional SIMD hypercube Q
n with up to n-1 node faults. In an SIMD hypercube, during a communication step, nodes can exchange information with their neighbors only
across a specific dimension. We use the concept of free dimension to develop our algorithms, where a free dimension is defined
to be a dimension i such that at least one end node of any i-dimension link is nonfaulty. In an n-cube, with f < n faults, it is known that there exist n-f+1 free dimensions. Using free dimensions, we show that broadcasting and global sum can be performed in n+5 steps, thereby improving upon the previously known algorithms for these primitives. The broadcasting algorithms work independent
of the location of source node and faulty nodes.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
90.
R. Padma Suvarna K. Raghavendra Rao K. Subbarangaiah 《Bulletin of Materials Science》2002,25(7):647-651
An inexpensive, indigenous and a simple electronic instrument based on voltage follower, currentto-voltage converter, zero
crossing detector and a phase detector has been developed for measurement of a.c. conductivity. Real and imaginary parts of
complex impedance are determined for a given sample as a function of frequency and the given sample is represented by a pure
electronic model. 相似文献