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2016 3rd International Conference on Information Science and Control Engineering (ICISCE)最新文献

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A Method for Color Calibration Based on Simulated Annealing Optimization 一种基于模拟退火优化的颜色校正方法
Haifeng Yu, T. Cao, Bo Li, Rong Dong, Huiyu Zhou
To accurately reproduce colors, it is necessary to calibrate a digital camera that is used to acquire images. The traditional calibration methods have been used to build a color correction model that has a transformation matrix mapping data from a RGB image to standard XYZ tristimulus. Determination of this matrix is performed through matrix transformation from each color checker patch to its corresponding actual XYZ value, using least-squares regression. However, these methods cannot effectively minimize the CIE DE error because of these algorithms' limitations and CCD dark currents, which can be hard to accurately measure. In this paper, a new color correction model is presented for color calibration and helps minimize the CIEDE2000 error in order to achieve higher color fidelity. Experimental results show that our method significantly outperforms other algorithms.
为了准确地再现色彩,有必要校准用于获取图像的数码相机。传统的校准方法已经被用来建立一个色彩校正模型,该模型具有从RGB图像到标准XYZ三刺激的变换矩阵映射数据。该矩阵的确定是通过使用最小二乘回归从每个颜色检查器补丁到其相应的实际XYZ值的矩阵变换来执行的。然而,由于这些算法的局限性和CCD暗电流难以准确测量,这些方法不能有效地减小CIE DE误差。本文提出了一种新的色彩校正模型,用于色彩校准,并有助于最小化CIEDE2000误差,以获得更高的色彩保真度。实验结果表明,该方法明显优于其他算法。
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引用次数: 4
Temperature Analysis in the Fused Deposition Modeling Process 熔融沉积建模过程中的温度分析
Yong Zhou, T. Nyberg, Gang-Yu Xiong, Dan Liu
The fused deposition modeling (FDM) is one of the most attractive 3D printing product manufacturing processes. FDM fabricates prototypes by extruding a semi-molten polymer filament through a heated nozzle in a prescribed pattern onto a platform. As the material is deposited, it cools, solidifies, and bonds with the surrounding materials. The temperature distribution among polymer filaments in the FDM process determines the bonding quality, integrity and mechanical properties of the resultant prototypes. A thermal model of FDM has been developed in this paper. The non-linear behavior of thermal conductivity and of specific heat due to temperature changes and phase transformation is considered here. The temperature evolution and the formation of the modelled part are investigated by a finite element analysis method based on the continuous media theory. Through the analysis of the prototypes using acrylonitrile butadiene styrene (ABS) filaments, it is shown that the effect of modelling has a strong influence on thermal evolution by changing the thermal properties of the material.
熔融沉积建模(FDM)是最具吸引力的3D打印产品制造工艺之一。FDM通过加热喷嘴将半熔融的聚合物长丝按规定的模式挤压到平台上来制造原型。当材料沉积时,它会冷却、凝固,并与周围的材料结合。在FDM工艺中,聚合物细丝之间的温度分布决定了所得到的原型的粘合质量、完整性和力学性能。本文建立了FDM的热模型。这里考虑了由于温度变化和相变引起的导热系数和比热的非线性行为。采用基于连续介质理论的有限元分析方法研究了模型零件的温度演化和成形过程。通过对丙烯腈-丁二烯-苯乙烯(ABS)长丝原型的分析,表明建模效应通过改变材料的热性能对热演化有很强的影响。
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引用次数: 53
Control Spatiotemporal Chaos in Coupled Logistic Lattices with Pinning Double Feedback 用钉住双反馈控制耦合逻辑格中的时空混沌
Lijing Zhang, Baixiang Sun, D. Liu
In order to enhance the control effectiveness, pinning double feedback method is adopted in the coupled logistic lattices (CML) spatio-temporal system. Its circuit was established, whose cell sub-circuit consists of the logistic map circuit. With Pspice, the scheme of control spatiotemporal chaos in CML by pinning double feedback is implemented. It experimentally confirms that it is effective. The experimental results are in good agreement with the ones obtained by simulating numerically and analyzing theoretically.
为了提高控制效果,在耦合逻辑格(CML)时空系统中采用了钉住双反馈方法。建立了其电路,其单元子电路由逻辑图电路组成。利用Pspice,实现了用钉住双反馈控制CML中时空混沌的方案。实验证实了该方法的有效性。实验结果与数值模拟和理论分析结果吻合较好。
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引用次数: 0
RFID Authentication Protocol with Enhanced-Bivium 增强bivium的RFID认证协议
Shiyong Zhang, Gongliang Chen, Jianhua Li
RFID (radio frequency identification) is a small electronic device that consists of small chip and an antenna. The biggest challenge for RFID technology is to provide benefits without degrading the secutiry level. This paper proposes a new RFID authentication protocol based on the lightweight stream cipher Enhanced-Bivium. In terms of security we show that the protocol is robust under the attack of spoofing and replay, tracking and desynchronization. As the protocol uses Enhanced-Bivium as both one-way function and random number generator and Enhanced-Bivium only need to be computed once by tags in each session, therefore the strategy is very eligible for low-cost RFID system compared with previous works.
RFID(无线射频识别)是一种由小芯片和天线组成的小型电子设备。RFID技术面临的最大挑战是在不降低安全水平的情况下提供好处。提出了一种基于轻量级流密码增强bivium的RFID认证协议。在安全性方面,我们证明了该协议在欺骗和重放、跟踪和去同步攻击下具有鲁棒性。由于协议使用了Enhanced-Bivium作为单向函数和随机数生成器,并且每次会话中标签只需要计算一次Enhanced-Bivium,因此与以往的工作相比,该策略非常适合低成本的RFID系统。
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引用次数: 0
Reconstruction of Frequency Hopping Communication Signals via Analog to Information Converter 用模拟-信息转换器重构跳频通信信号
Lei Chen, Yu Liu
Frequency Hopping (FH) signal is widely used in military filed especially in military communication for its good anti-jamming performance and multiple access capability. With the increase of FH signal's band width, it makes a huge pressure on traditional Analog to Digital Converter. Theory of compressed sensing (CS) enables a successful reconstruction of sparse signal by sampling at a sub-Nyquist sample rate. In this paper, we apply CS into frequency hopping communication signal's reconstruction and explore the available improvement. We adopt the Random Demodulator scheme, which is a popular architecture in Analog to Information Converter (AIC), to obtain the digital sequence and realize a precise reconstruction with high possibility at a sub-Nyquist sampling rate. Then some improvements are made on the construction of observation matrix to enhance the adaptation in sampling. Besides, K-SVD algorithm is deployed to train an overcomplete dictionary which is used as sparse matrix. Simulations are performed to verify the reconstruction performance of this scheme.
跳频信号以其良好的抗干扰性能和多址能力在军事通信领域得到了广泛的应用。随着跳频信号频带宽度的增大,传统的模数转换器承受着巨大的压力。压缩感知理论(CS)能够通过以亚奈奎斯特采样率采样来成功地重建稀疏信号。本文将CS应用于跳频通信信号的重构中,并探讨了可行的改进方法。采用模拟信息转换器(AIC)中常用的随机解调器(Random demomodulator)方案,以亚奈奎斯特采样率获得高概率的精确重构数字序列。然后对观测矩阵的构造进行了改进,增强了采样的自适应能力。利用K-SVD算法训练一个过完备字典作为稀疏矩阵。仿真结果验证了该方案的重构性能。
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引用次数: 1
An Improved Two-Dimensional Gaussian Fitting Method for Space Target Positioning 空间目标定位的改进二维高斯拟合方法
Jibo Tan, Jianyu Huang, Kunpeng Wang, Wentang Wu
With the heavily increasing of the number of space debris, research of positioning for space target image gradually becomes a hot topic. Generally, results of sub-pixel positioning will directly affect the orbit positioning accuracy of space targets. Centroid method, median method, one-dimensional and two-dimensional Gaussian fitting are commonly used positioning methods. Positioning performance for those methods is compared using the actual observed image. For solving the problem that positioning accuracy is reducing on distorted image, an improved two-dimensional Gaussian fitting method is proposed. Good results have achieved using the actual observed image.
随着空间碎片数量的大量增加,空间目标图像的定位研究逐渐成为一个热点。一般情况下,亚像元定位的结果将直接影响空间目标的轨道定位精度。质心法、中位数法、一维和二维高斯拟合是常用的定位方法。利用实际观测图像比较了这几种方法的定位性能。针对图像失真后定位精度降低的问题,提出了一种改进的二维高斯拟合方法。利用实际观测图像,取得了较好的效果。
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引用次数: 2
Bidirectional Droop Control of Interlinking Converter in AC/DC Hybrid Micro-Grid 交直流混合微电网中互连变换器的双向下垂控制
Ji Yu, Wu Ming, Liu Haitao, Li Yang, Zhang Ying
The interlinking converter in an AC/DC hybrid micro-grid plays a crucial role in the stable operation and power allocation of power system. A bidirectional droop control method for the converter is proposed, which measures the power demand degree of AC sub-grid and DC sub-grid according to AC bus frequency and DC bus voltage respectively, and determines the direction and magnitude of the converter transmission power. Two droop control modules, DC voltage-active power and AC frequency-active power, are included in the control structure. The power reference value of the converter is achieved from the output subtraction of two modules. Meanwhile to reduce the deviation of voltage and frequency caused by droop control, a recovery control is designed to improve the power quality and the reliability of the hybrid micro-grid. The bidirectional droop control can accurately coordinate the transmission power between AC subgrid and DC sub-grid and make full use of the distributed energy. The feasibility of the control method is verified by a simulation system built with DigSILENT.
交直流混合微电网中的互联变流器对电力系统的稳定运行和功率分配起着至关重要的作用。提出了一种变换器的双向下垂控制方法,分别根据交流母线频率和直流母线电压测量交流子网和直流子网的电力需求程度,确定变换器传输功率的方向和大小。控制结构包括直流电压有功电源和交流频率有功电源两个下垂控制模块。变换器的功率参考值由两个模块的输出相减得到。同时,为了减小下垂控制引起的电压和频率偏差,设计了恢复控制,以提高混合微电网的电能质量和可靠性。双向下垂控制可以准确协调交直流子网之间的输电功率,充分利用分布式能量。利用DigSILENT软件搭建的仿真系统验证了该控制方法的可行性。
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引用次数: 12
Web Application Automatic Testing Solution Web应用程序自动测试解决方案
Xiao Dawei, Xu Xinpeng, Jiang Liqiu, W. Yuhang
With the cloud concept becoming more and more clearly, Web application has become one of the focuses in our life and work. The development of Web application is different from the one of traditional desktop application, its iteration cycle is short and its demand changes are special. More and more Web development teams turn to agile development, and Web application testing has encountered new challenges. In this paper, a method is implemented through building a good testing framework, which could reduce the coupling among the test modules, improve the test efficiency and coverage rate, and meanwhile reduce the cost and ensure the quality of software.
随着云概念的日益清晰,Web应用已经成为我们生活和工作中的重点之一。Web应用程序的开发不同于传统桌面应用程序的开发,其迭代周期短,需求变化特殊。越来越多的Web开发团队转向敏捷开发,Web应用程序测试遇到了新的挑战。本文通过构建良好的测试框架来实现一种方法,该方法可以减少测试模块之间的耦合,提高测试效率和覆盖率,同时降低成本,保证软件质量。
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引用次数: 2
Study on the Traffic Flow under Keep-Right-Except-to-Pass Rule Based on Dynamic Model 基于动态模型的停车限行规则下的交通流研究
Xiaofang Yang, Yanping Nie
In those countries where driving automobiles on the right is the rule, multi-lane freeways often employ the keep-right-except-to-pass rule. To assess the performance of this rule in terms of traffic flow, safety and posted speed limit, we build a dynamic model for mixed traffic flow. In order to analyze easily and clearly, the road is divided into three kinds of road sections. By solving the dynamic model, we find that this rule can promote the traffic flow in light traffic. The traffic flow and safety index can't be high simultaneously and under-or over-speed limits may restrict the traffic flow.
在那些规定车辆靠右行驶的国家,多车道高速公路通常采用“除非通过,否则靠右行驶”的规则。为了评估该规则在交通流、安全性和张贴限速方面的性能,我们建立了混合交通流的动态模型。为了便于分析清楚,将道路分为三种路段。通过对动态模型的求解,发现该规则可以促进轻交通的交通流。交通流量和安全指标不可能同时很高,低于或超过限速都会限制交通流量。
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引用次数: 1
Hand Tracking Based on Improved Particle Filters with Elliptical Region Covariance Descriptors 基于椭圆区域协方差描述符改进粒子滤波的手部跟踪
Yi Zheng, Ping Zheng
In the process of human computer interaction, hand tracking is of great importance. A practical hand tracking method based on improved particle filters with elliptical region covariance descriptors is proposed. Firstly, an elliptical tracking window containing the hand is determined manually in the initial frame. Based on the HSV color model, the color feature of bare hands is extracted, and color histograms of the target model and the candidate model are obtained. Then the observation likelihood function can be determined. A first-order system equation is used as the motion model. In order to take into account rotation changes of hands, an elliptical region covariance descriptor is used as the target feature model. The particle number threshold is preset, and the particle impoverishment can be improved by resampling method. Experimental results demonstrate that the proposed method can track the moving hand accurately. The proposed hand tracking method can be used in the fields of human computer interaction and augmented reality.
在人机交互过程中,手部跟踪是非常重要的。提出了一种实用的基于椭圆区域协方差描述符改进粒子滤波的手部跟踪方法。首先,在初始帧中手动确定包含手的椭圆跟踪窗口;基于HSV颜色模型,提取徒手的颜色特征,得到目标模型和候选模型的颜色直方图。然后可以确定观测似然函数。采用一阶系统方程作为运动模型。为了考虑手的旋转变化,使用椭圆区域协方差描述子作为目标特征模型。设定粒子数阈值,通过重采样方法改善粒子贫困化。实验结果表明,该方法能够准确地跟踪手部运动。该方法可应用于人机交互和增强现实等领域。
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引用次数: 0
期刊
2016 3rd International Conference on Information Science and Control Engineering (ICISCE)
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