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Engineering 2018年第1期 105-116页

作者：杨小牛王巍许小丰庞国荣张春磊 Science and Technology on Communication Information Security Control Laboratory Science and Technology on Electro-Optical Information Security Control Laboratory

首先面向我国网络空间实际情况,提出网络空间"三分论",针对公共互联网(C空间)、党政军保密网(S空间)和关键基础设施网(K空间)三大网络空间的不同需求,给出了相应的安全应对策略和研究框架。然后重点针对公共互联网,探讨了基于... 详细信息

首先面向我国网络空间实际情况,提出网络空间"三分论",针对公共互联网(C空间)、党政军保密网(S空间)和关键基础设施网(K空间)三大网络空间的不同需求,给出了相应的安全应对策略和研究框架。然后重点针对公共互联网,探讨了基于SMCRC环(situation awareness,monitoring,cooperative defense,recovery,countermeasure)的网络空间安全生态体系的功能特点和内在信息交互方式,并分别对"SMCRC环"中态势感知、持续监控、协同防御、快速恢复、溯源反制等五大环节的核心关键技术进行了讨论,以期对国家网络空间安全研究起到抛砖引玉之作用。

关键词：网络空间安全生态体系 SMCRC环网络空间三分论

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High visibility temporal ghost imaging with classical light

arXiv

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arXiv 2017年

作者： Liu, Jianbin Wang, Jingjing Chen, Hui Zheng, Huaibin Liu, Yanyan Zhou, Yu Li, Fu-Li Xu, Zhuo Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education International Center for Dielectric Research Xi'an Jiaotong University Xi'an710049 China Science and Technology on Electro-Optical Information Security Control Laboratory MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Department of Applied Physics Xi'an Jiaotong University Xi'an710049 China

High visibility temporal ghost imaging with classical light is possible when superbunching pseudothermal light is employed. In the numerical simulation, the visibility of temporal ghost imaging with pseudothermal light equaling (4.7 ± 0.2)% can be increased to (75 ± 8)% in the same scheme with superbunching pseudothermal light. The reasons for the difference in visibility and quality of the retrieved images in different situations are discussed in detail. It is concluded that high visibility and high quality temporal ghost image can be obtained by collecting large enough number of data points. The results are helpful to understand the difference between ghost imaging with classical light and entangled photon pairs. The superbunching pseudothermal light can be employed to improve the image quality in ghost imaging applications. Copyright © 2017, The Authors. All rights reserved.

关键词： Visibility

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Agile laser beam deflection with high steering precision and angular resolution using liquid crystal optical phased array

Agile laser beam deflection with high steering precision and...

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IEEE International Nanoelectronics Conference (INEC)

作者： Xiangru Wang Shuanghong Wu Man Li School of Optoelectronic Information University of Electronic Science and Tech. of China Chengdu China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe China

To improve the steering precision and angular resolution of liquid crystal optical phased array, in this paper, we proposed a modified periodic phase controlled method to realize a continuous scanning with a constant angular resolution of less than 20 μrad, meanwhile, its precision is less than 5 μrad (RMS). Also, another method we proposed is called sub-aperture coherence can realize even better angular resolution less than 5 μrad which is the limitation of our measurement instrument.

关键词： Measurement by laser beam Laser beams Phased arrays optical arrays Coherence Laser theory Laser radar

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Mid-infrared ZnGeP2 optical parametric oscillator pumped by Tm:YAlO3 laser

Mid-infrared ZnGeP2 optical parametric oscillator pumped by ...

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作者： Wang, Lixin Zhang, Xiaojuan Xu, Hong School of Electro-Optical Beijing Institute of Technology Beijing100081 China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe065201 China

We report experimental results on a mid-infrared (mid-IR) ZnGeP2 optical parametric oscillator (OPO) pumped by a thulium laser. A high efficient Q-switched a-cut Tm:YAlO3 (Tm:YAP) laser was used to directly drive a ZnGeP2 OPO to generate 3-5 μm wavelength range. The diode pumped Tm:YAP laser operated on 1.99 μm at 10 kHz repetition rate, and its optical-tooptical conversion efficiency was 22.2%. The laser was run with room temperature components and achieved nearly 2 W average output power at 3-5 μm region with an efficiency of 5.5% starting from the pump diode. The influences of curvature and reflectivity of OPO output mirror on laser output are analysed and validated by experiments, and the results have benefit for the optimisation of such lasers. Copyright © 2015 Inderscience Enterprises Ltd.

关键词： optical parametric oscillators

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GB-RC4: Effective brute force attacks on RC4 algorithm using GPU 7

GB-RC4: Effective brute force attacks on RC4 algorithm using...

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7th International Green and Sustainable Computing Conference, IGSC 2016

作者： Xue, Pei Li, Tao Dong, Han Liu, Chunbo Ma, Wenjing Pei, Songwen College of Computer and Control Engineering Nankai University Tianjin300071 China Information Security Evaluation Center Civil Aviation University of China Tianjin300300 China Laboratory of Parallel Software and Computational Science State Key Laboratory of Computing Science Institute of Software CAS Beijing China Shanghai Key Lab of Modern Optical Systems Department of Computer Science and Engineering University of Shanghai for Science and Technology Shanghai200093 China

ISBN: (纸本)9781509051175

Encryption algorithms are applied to a variety of fields and the security of encryption algorithms depends heavily on the computational infeasibility of exhaustive key-space search. RC4 algorithm has an extensive application for stream encryption, however, the disadvantages of traditional RC4 serial algorithm are large computational quantity and slow computation speed, which means a great challenge for throughput of computing system. Graphics processors recently have been widely used as accelerators for high throughput computing. In this paper, GPU is used to improve the efficiency and performance of attacking RC4 algorithm. First, we revised RC4 algorithm to make it easier to parallelize on a GPU. Then we take advantage of constant memory and shared memory in GPU to search the key space of RC4 algorithm efficiently. Besides, we solved the bank conflict problem in shared memory to further improve the performance. Our approach was evaluated in the whole key space of 40-bit, and the results show it can complete searching of the whole key space within 12.8 hours. © 2016 IEEE.

关键词： Graphics processing unit

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Fast multi-level connected component labeling for large-scale images

Fast multi-level connected component labeling for large-scal...

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International Conference on Optoelectronics and Microelectronics (ICOM)

作者： Yuhai Li Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe Hebei P.R.China

Connected component (CC) labeling is time consuming during image segmentation and object identification, especially when input images are large-scale and binary converting uses multi-threshold. So in this paper, we present a fast multi-level CC labeling by combining online threshold segmentation and a one-pass labeling algorithm, also a detailed architecture for hardware implementation is proposed. During labeling, firstly a gray image is converted to several binary data flows with different thresholds. Then they are marked by run-length code respectively with 2× 2 scanning windows, in the meantime, the equal labels between two adjacent rows are obtained by these windows for CC merging. By executing this process until the end of input image, the CC labels are obtained after one-pass image scanning. Our method is tested on more than 1000 gray images which resolution are 1920×1080. Experimental results show that our algorithm can extract the positions and areas of CC in multi-threshold binary images at least 50 frames per second (fps) on a Stratix IV FPGA platform running at 109.7 MHz.

关键词： labeling Memory management Random access memory Signal processing algorithms Algorithm design and analysis Hardware Image processing

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Experimental studies on beam quality-improving of 8μm ZGP optical parametric oscillator

Experimental studies on beam quality-improving of 8μm ZGP o...

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International Conference on Optoelectronics and Microelectronics (ICOM)

作者： Kuaikuai Yu Zhiqiang Liang Xiusheng Yan Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe Hebei P. R. China

We report on experimental studies on the beam quality of the 8μm ZGP optical parametric oscillator(OPO). Through conducting a series of comparative experiments, the effects of resonator length, type of phase matching, resonant wavelength and structure of the resonator on the beam quality of ZGP OPO were studied respectively. By using longer resonator length (120mm), type I phase matching, longer resonant wavelength (8μm) and the ring cavity, the output with the beam quality factor of M 2 ~1.20 and 1.22 in the horizontal and vertical direction were achieved respectively. And this is a rather good beam quality level for 8μm ZGP OPO.

关键词： Laser beams Cavity resonators optical resonators Crystals optical frequency conversion Measurement by laser beam

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Study on the radiation of laser induced air plasma 31

Study on the radiation of laser induced air plasma

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31st General Assembly and Scientific Symposium of the International Union of Radio science, URSI GASS 2014

作者： Xin, Liu Biyi, Wang Wanli, Zhao Shanghong, Guan Xiusheng, Yan Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe Hebei China

ISBN: (纸本)9781467352253

This paper details the radiation of laser induced air plasma. The plasma was produced by interacting the air with the Nd: YGA laser focused with optical lens. The relationship between spectrum of laser - induced air plasma at 1064nm and the laser power density was investigated, the time and space properties of the signal were studied, which provides a clear physical picture of laser induced air plasma. Results showed that the laser - induced air plasma has strong and directional radiation at 1064nm. © 2014 IEEE.

关键词： Laser produced plasmas

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Prediction model of aerosol fire extinguishing agent performance based on combination of genetic algorithm and back-propagation neural network

Prediction model of aerosol fire extinguishing agent perform...

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4th International Conference on Materials science and information technology, MSIT 2014

作者： Chen, Zhi Jie Zhu, Chen Guang Zhang, Zi Hao School of Chemical Engineering Nanjing University of Science and Technology Nanjing Jiangsu 210094 China Science and Technology on Electro-optical Information Security Control Laboratory Sanhe 065201 China

ISBN: (纸本)9783038351733

The aerosol fire extinguishing agent is a complex pyrotechnic composition, and the extinguishing efficiency need a series of experiments to identify. A method is put forward out based on combining back-propagation neural network and genetic algorithm (BP-GA) in this paper, and then the performance of aerosol fire extinguishing agent can be predicted in advance by the formulation. In the method, back-propagation (BP) algorithm was proposed to map the complex relationship between additive components and quality indexes of formulation. The genetic algorithm was employed to optimize the BP neural network weight and threshold. The results showed that the prediction display a satisfied consistence with the test and the error is less than 5%, and also indicated that the combining BP-GA method was an effective tool to predict the performance of aerosol fire extinguishing agent by the formulation designed. © (2014) Trans Tech Publications, Switzerland.

关键词： Genetic algorithms

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Study on the growth model of expandable graphite

Study on the growth model of expandable graphite

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4th International Conference on Materials science and information technology, MSIT 2014

作者： Ye, Fei Zhu, Chen Guang Zhang, Zi Hao School of Chemical Engineering Nanjing University of Science and Technology Nanjing Jiangsu 210094 China Science and Technology on Electro-optical Information Security Control Laboratory Sanhe 065201 China

ISBN: (纸本)9783038351733

The expansion mechanism of expandable graphite (EG) was studied systematically in this paper. Based on the feature of the structure and the linear expansion of expandable graphite, a simple expansion model was established by the energy balance and mass balance equation. And the model was modified by setting of the boundary conditions. The result showed that a good agreement is confirmed by comparing the test data and model, especially the two inflection points of the growth rate. The study may provide theory support for improving using condition and expand application fields of the expandable graphite. © (2014) Trans Tech Publications, Switzerland.

关键词： Expansion

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