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Zhengzhou, China

Zhu J.,Air Defense Forces Academy | Cai Y.,The Academy of Management | Pan X.,PLA 456th Hospital
Proceedings of the World Congress on Intelligent Control and Automation (WCICA)

Traditional methods of dimension matching has some disadvantages large task of computing and discarding of some useful data in Radar network data fusion. So they can't meet the needs of air intelligence fusion anymore. The fractal fusion is a new way to solve the radar measurement of different scales without dimension matching. This method bases on the celestial coordinate system, which can be seen as two parts, celestial coordinate and Centrifugal distance. It can get system track based on Celestial coordinate system with fusion process. Simulation is provided to show that the method can get higher fusion accuracy with less computing in this paper. © 2014 IEEE. Source

Zhongyin L.,Shenzhen University | Jianjun H.,Shenzhen University | Jingxiong H.,Air Defense Forces Academy
IEEE Region 10 Annual International Conference, Proceedings/TENCON

In this paper, a new approach based on Sub-sampled Inverse Fast Fourier Transform (SSIFFT) for efficiently acquiring compressive measurements is proposed, which is motivated by random filter based method and sub-sampled FFT. In our approach, to start with, we multiply the FFT of input signal and that of random-tap FIR filter in frequency domain and then utilize SSIFFT to obtain compressive measurements in the time domain. It requires less data storage and computation than the existing methods based on random filter. Moreover, it is suitable for both one-dimensional and two-dimensional signals. Experimental results show that the proposed approach is effective and efficient. © 2015 IEEE. Source

You P.,National University of Defense Technology | Peng Y.,National University of Defense Technology | Liu W.,Jiangsu Automation Research Institute | Xue S.,Air Defense Forces Academy
Proceedings - 32nd IEEE International Conference on Distributed Computing Systems Workshops, ICDCSW 2012

Recently, Cloud computing, as one of the hottest words in IT world, has drawn great attention. Many IT companies such as IBM, Google, Amazon, Microsoft, Yahoo and others vigorously develop cloud computing systems and related products to customers. However, there are still some difficulties for customers to adopt cloud computing, in which many security issues exist, because data for a customer is stored and processed in cloud, not in a local machine. This paper briefly introduces cloud computing and its key concepts. In particularly, we intend to discuss security requirements and security issues involving data, application and virtualization in cloud computing, as well as current solutions to these issues. © 2012 IEEE. Source

Zhu Y.-Z.,National University of Defense Technology | Yi S.-H.,National University of Defense Technology | Kong X.-P.,National University of Defense Technology | Quan P.-C.,National University of Defense Technology | And 2 more authors.
Wuli Xuebao/Acta Physica Sinica

In a low-noise supersonic wind tunnel at a Mach number 3.4, visualization of flow structure around backward facing step (BFS) with a 3 mm high step is carried out via schlieren and nano-tracer-based planar laser scattering (NPLS) respectively. The time-averaged flow characteristic of the reattachment region and the rich instantaneous structures of the redeveloping boundary layer are both revealed. By contrasting the NPLS images at different times, the unsteady evolvement characteristic of the coherent vortices in the redeveloping boundary layer is discussed. And the results are compared with the schlieren of Mach 4.2 and the prior data published. Results indicate that with either of the two flow visualization ways, the shock waves and the expansion waves can be captured; however, the NPLS technique has the obvious advantages to reveal the instantaneous structures on a small scale in a certain section plane with a time resolution of 6 ns and spatial resolution about micron magnitude; under the flow condition in this contribution, the growth rate of redeveloping boundary layer is 0.07519; the characteristic time is around 10 μs of the hairpin vortex shedding. At the same expansion rate, the reattachment occurs later with increasing Mach numbers, while if the expansion rate increases, the reattachment occurs earlier, and the flow turn angle is larger. © 2014 Chinese Physical Society. Source

Song Z.-X.,Zhengzhou University | Li W.-W.,Zhengzhou University | Li X.-H.,Zhengzhou University | Dai Y.,Zhengzhou University | And 3 more authors.
International Journal of Hydrogen Energy

A new fermentative hydrogen-producing strain FS2011 was isolated from an effluent of bio-hydrogen production reactor, and identified as Bacillus amyloliquefaciens on the basis of 16S rDNA gene sequence. The strain could utilize various carbon and nitrogen sources to produce hydrogen in a broad range of initial pH (5.29-7.38). Phosphate buffer concentration and fermentation temperature significantly affected hydrogen production and cell growth. The maximum hydrogen yield of 2.26 mol/mol was observed at glucose concentration of 10 g/l, beef extract concentration of 2 g/l, initial pH 6.98, phosphate buffer of 20 mmol/l, and 35 °C, indicating FS2011 was a high-efficiency hydrogen-producing bacterium. Source

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