Entity

Time filter

Source Type


Li S.,Peking University | Cheng C.,Peking University | Hao S.,Space Star Technology | Ran Z.,Hainan Technology and Business College
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

Because of the influence of atmosphere, the characteristics of the sensor and the image recording system, the quality of on-orbit obtained satellite images maybe get lower. The radiation distortion is caused by various factors, such as the blurring of the imaging system, non-linear amplitude response, vignetting and shadows, transmission noise, atmospheric interference, the changes of surface exposure and the radiance changes with the angle. According to the actual characteristics of high-resolution satellite images, we presented a radiation correction method which solved the image distortion problem. The radiation correction can provide a good basis for the image geometric correction, image fusion, etc. By the actual obtaining data of satellite on-orbit experiments, this program solves the problems of chrominance, mosaics, correction, drop-out lines, and noise existed in the images which are obtained by the raw data after decryption and decompression. The radiation correction can provide a good basis for the image mapping process, image fusion, etc. © 2011 SPIE. Source


Xia Y.,Hainan Technology and Business College | Xia Y.,Haikou College of Economics | Yi C.,Haikou College of Economics
Advanced Materials Research | Year: 2014

It combines the own characteristics of vehicle scheduling, taking into account the both interests of the bus company and passengers, and establishes the vehicle scheduling plan model, taken the departure time (real value) as the gene variables to encode, and taken the difference between the adjacent grid spacing, the departure time interval of maximum and minimum, passenger load factor etc. to limit. With the example, the GA- SAmodel is improved to optimize the solution. Finally, it is possible to reliably find an optimal or near-optimal solution program on vehicle scheduling optimization problem in transit huge search space. Through comparative analysis of the experimental results, it can verify the effectiveness of the improved algorithm and superiority. © (2014) Trans Tech Publications, Switzerland. Source


Zhang L.F.,IBM | Chen L.,Hainan Technology and Business College
Applied Mechanics and Materials | Year: 2014

MPI is one of the important standards in high performance computing. MPI performance is generally focused on collective communications. And FCA (Fabric Collective Accelerator) is a new method accelerating collective communications. Through high performance computing environment testing, this paper mainly analyses the result of FCA with shared memory and without share memory accelerating IBM Platform MPI, FCA's principle and integration between IBM Platform MPI and FCA. At the same time, this paper may be a good reference for high performance computing using FCA. © (2014) Trans Tech Publications, Switzerland. Source


Lin Z.,Hainan Normal University | Zhao C.-J.,Hainan Normal University | Li P.-S.,Hainan Technology and Business College
Advances in Intelligent Systems and Computing | Year: 2014

The remote sensing images of Landsat TM and ETM+, June 2000 and 2010, were used to extract the land use information of Diaoluoshan National Forest Park and its surrounding areas by using ERDAS Imagine 9. 0. Ten factors, elevation, slope, geological structure, land cover, settlement, the location of Diaoluoshan Nature Reserve, and so on, were chosen to evaluate ecological suitability. Applying the Delphi method to assess the grade and weight of the evaluation indicators, and then on the basis of the 1:50,000 digital topographic map to create digital raster graphics of different assessment factors using Arc GIS 9. 1. The regional ecological suitability index (RESI) of each assessment unit was calculated by overlapping of each assessment grid. The RESI value of multifactor weighted superposition was 1.35–4.85 in the research areas, and the land was classified into 5 types, high suitability, suitability, basic suitability, unsuitability, and high unsuitability zone, by using the K-means clustering method. After that, generating spatial distribution map of regional suitability was based on the RESI reclassification, which provided a scientific method for the ecological conservation, resource exploitation, utilization, and management of Diaoluoshan National Forest Park. © Springer International Publishing Switzerland 2014. Source


Chen Y.,Hainan Technology and Business College
Proceedings of the IEEE International Conference on Software Engineering and Service Sciences, ICSESS | Year: 2015

Based on the non-cooperative power control game (NPG) proposed by David Goodman, an improved cost function is adopted. To meet the communications needs between licensed users and secondary users in cognitive radios, and ensured that the unimpaired operation of licensed users and secondary users' communications be not intermitted, a MC-CDMA cognitive radio system and a hand-off technique were proposed for secondary users. In order to efficiently use the limited cognitive radio resources, a novel power control game algorithm in CR systems was adopted. The simulation results show that in comparison to several classical distributed algorithms, the novel algorithm can regulate their transmitter powers to meet the different SIR requirements and enhance the total throughput effectively. Besides, the performance of the system is significantly improved. © 2015 IEEE. Source

Discover hidden collaborations