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In this paper, we proposed a pedestrian detection system based on laser and image data fusion. The high speed of laser data based location and precise of image based classification are fully explored. First, laser scanner point data is clustered into segments, each of which implies a pedestrian candidate. Then, the segments are projected to the image domain to form regions of interest (ROI) on the...
For general airplane design, the research fund is limited and the research period is short. Applying the efficient and intuitive visualization techniques is beneficial to solve this problem. This paper visually simulated the environment around the choice of the aircraft's flight parameters, airplane taking off and landing and the cockpit view. This research established an airport environment visualization...
Polished rod hoisting system is one of the key components in the sucker-rod pumping system. In order to reduce its cost and improve its dynamic performance, the mathematical of dynamic simulation and optimization design is established and calculated respectively. Dynamic analysis result provides theoretic foundation for the optimization of polished rod hoisting system. Aiming at the hoisting system...
Land Use and Coverage Change (LUCC) is an important aspect of global change. It is also very meaningful to regional development and land use management towards sustainable development. In this research, Nanjing, as one representative city in Yangtze River Delta, one of the regions which have the densest population and the quickest economic growth, was chosen to be the research area. Remote Sensing...
This paper presents a genetic algorithm (GA) approach for parameters optimization of support vector machine, which is used for the object-oriented classification of high spatial resolution images over urban area. The proposed method is a three-step routine involves the integration of 1) image segmentation, 2) GA-based parameter optimization of Support vector machine (SVM), and 3) objected-based classification...
Large scale forest mapping and change detection plays a significant role in the study of global change, particularly in the research of carbon source and sink. This paper presents results from forest/non-forest classification using ENVISAT-ASAR data. Both pixel-based and object-based classification method were developed for ASAR HH/HV images acquired on a single date. For the object-based classification,...
Simultaneously segmenting and labeling images is a fundamental problem in Computer Vision. In this paper, we introduce a hierarchical CRF model to deal with the problem of labeling images of street scenes by several distinctive object classes. In addition to learning a CRF model from all the labeled images, we group images into clusters of similar images and learn a CRF model from each cluster separately...
The research tool of Carbon Footprint was brought forward to formulate Low-Carbon City Proper Planning better. In order to accommodate the long range and uncertainty in Low-Carbon City Proper planning, for example, Beijing Shijingshan District, all kinds of Carbon Footprint and the capacity of Carbon sink of city proper were calculated and analyzed by the computing method of Carbon Footprint, then,...
40-Gb/s 2-Channel all-optical 3R regeneration with simultaneous wavelength conversion has been realised by a fiber parametric amplifier(FPA) with the data signal to be regenerated as the pump,eliminating the unequal suppression of noise between bit0 and bit1. Signal to noise ratio is improved respectively from 2.7, 2.4 to 4.9, 5.2.
This paper presents a high efficiency LED driver that employs a current-mode buck regulator to energize four linear constant-current regulators. An auto-tuning procedure is introduced in to adjust the output voltage of buck regulator, which keeps the dropout voltage of the passive devices in linear regulators at a possible minimum level while maintaining high performance. Thus, the conversion efficiency...
We propose a novel technique to extent the tunable range of the RF frequency generated by optoelectronic oscillators. By utilizing injection locking of Febry-Perot Laser diode rather than the commonly used radio-frequency bandpass filter, a tunable range from 11.074 GHz to 39.400GHz is demonstrated experimentally.
In underwater situations, clarify of images are degraded by light absorption and scattering. In order to restore the original clarity of the images underwater, we analyze the physical effects of visibility degradation, and present an algorithm which inverts the image formation process. In this paper, we consider the visibility restoration from a single underwater image as a particular filtering problem...
We investigate the maximum outage throughput for Orthogonal Frequency Division Multiple Access (OFDMA) systems in the presence of feedback channel capacity constraints. We attempt to establish an information-theoretic lower bound on the capacity of feedback channel and build the corresponding test channel that achieves this lower bound. Based on the derived test channel, we formulate the outage throughput...
We propose a novel technique to achieve optical frequency up-conversion in millimeter wave band without any local microwave oscillator. By utilizing injection locking of Febry-Perot Laser diode, a suitable negative dispersion device and polarization interferometer, a 2.5 Gb/s baseband signal is frequency up-conversion to a subcarrier modulation signal at 30.8 GHz.
40 Gb/s optical demultiplexing with amplitude regeneration is demonstrated based on data pump fiber-optical parametric amplification while a 10 GHz short pulse is used as the probe. Four 10 Gb/s output channels with at least 14 dB extinction ratio enhancement and an average 5.5 Q factor is obtained after demultiplexing.
Design of the DC/DC switching power supply is introduced in this paper. The high frequency inverter main circuit of the DC/DC switching power supply is composed of power MOSFET; The controlling signal of the main circuit is generated by the PWM chip SG6841; Experiment proves, Its input voltage range is 18 ∼ 36VDC, output is 5V/6A, It is steady, reliable.
In this paper, we propose a novel scheme that joints two-level spreading OFDM and beam forming. For further interference suppression, we assign a proper spreading code at transmitter and employ the Minimum Mean Square Error - MUltiuser Detection (MMSE-MUD) equalizer at receiver. Simulation results show that the proposed system outperforms the conventional two-level spreading OFDM system under multipath...
Target tracking plays a critical role in the applications of wireless sensor networks. In this paper, we propose a target tracking algorithm based on Bayesian estimation, the key steps involved in the algorithm include target detection based on a probabilistic model, preliminary localization using the two-stage target locating algorithm, further prediction adopting Bayesian estimation. Simulation...
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