Parametric Stabilization of Quantized Interconnected Systems with Application to Coupled Inverted Pendulums

This paper studies the analysis of parametric stability and decentralized state feedback control of a kind of quantized interconnected systems. The output of each controller is quantized logarithmically before it is input to the subsystem, and the quantized density would affect the stability of the systems. First, a decentralized state feedback controller is designed for interconnected systems without quantization and the corresponding stable region is obtained. Second, for a given controller, the lower bound of the quantization density is evaluated from parameters of local controllers. Finally, the proposed method is applied to coupled inverted pendulums systems which can be viewed as quantized interconnected systems. The simulation results show that by using the proposed quantized controllers, the interconnected inverted pendulum systems are parametrically stabilized.     

An Interacting Multiple Model Approach for State Estimation with Non‐Gaussian Noise Using a Variational Bayesian Method

The conventional interacting multiple models (IMM) approach for a hybrid system under the Gaussian assumption is limited for most real applications due to the noisy measurements often being in the presence of outliers. This paper aims at accommodating the IMM approach to the non‐Gaussian cases where outliers exist. In the proposed IMM algorithm, the Student‐t distribution is used to model the non‐Gaussian measurement noise. At the interaction step, the mixed statistics of the noise parameter under a Bayesian framework are obtained via a Gamma approximation and a recently reported moments matching method. To address the state noise‐coupled intractability in Bayesian filtering, a variational Bayesian method is utilized to approximate the posterior distributions of the noise and state recursively. The proposed algorithm is tested with a maneuvering target tracking example and is shown to be robust to the outliers.     

选煤厂信息物理系统任务调度研究

建立了选煤厂信息物理系统模型,将动态联盟思想引入选煤厂信息物理系统任务调度中,并提出了一种基于改进离散粒子群优化算法的选煤厂信息物理系统任务调度算法。该算法首先采用离散粒子群优化算法进行全局寻优,然后采用禁忌搜索算法进行局部搜索,求得全局最优解。仿真结果表明,该算法提高了任务调度的收敛速度、精度以及处理器的平均利用率。     

智能网络运维监控系统

我国在自动化的监控手段方面还比较缺乏,完全无法做到及时且全面的对多个业务项目系统的真实运行情况以及运行状态进行有效的掌握,运维管理所采用的管理模式是传统形式中的被动形式管理模式.因此,为了给网络系统提供更加具有可靠性和安全性的工作,文章将智能化的网络运维监控系统作为主要的研究对象,对其系统结构以及系统功能进行详细的介绍,并将SNMP协议和ICMP协议作为网络运维系统的基础,对其进行详细的设计,同时对系统中的软件设计方案进行了周密的探讨.     

Video archaeology: understanding video manipulation history

Facing the explosive growth of near-duplicate videos, video archaeology is quite desired to investigate the history of the manipulations on these videos. With the determination of derived videos according to the manipulations, a video migration map can be constructed with the pair-wise relationships in a set of near-duplicate videos. In this paper, we propose an improved video archaeology (I-VA) system by extending our previous work (Shen et al. 2010). The extensions include more comprehensive video manipulation detectors and improved techniques for these detectors. Specially, the detectors are used for two categories of manipulations, i.e., semantic-based manipulations and non-semantic-based manipulations. Moreover, the improved detecting algorithms are more stable. The key of I-VA is the construction of a video migration map, which represents the history of how near-duplicate videos have been manipulated. There are various applications based on the proposed I-VA system, such as better understanding of the meaning and context conveyed by the manipulated videos, improving current video search engines by better presentation based on the migration map, and better indexing scheme based on the annotation propagation. The system is tested on a collection of 12,790 videos and 3,481 duplicates. The experimental results show that I-VA can discover the manipulation relation among the near-duplicate videos effectively.     

Skeleton pruning as trade-off between skeleton simplicity and reconstruction error

The position and orientation of moving platform mainly depends on global positioning system and inertial navigation system in the field of low-altitude surveying, mapping and remote sensing and land-based mobile mapping system. However, GPS signal is unavailable in the application of deep space exploration and indoor robot control. In such circumstances, image-based methods are very important for self-position and orientation of moving platform. Therefore, this paper firstly introduces state of the art development of the image-based self-position and orientation method (ISPOM) for moving platform from the following aspects: 1) A comparison among major image-based methods (i.e., visual odometry, structure from motion, simultaneous localization and mapping) for position and orientation; 2) types of moving platform; 3) integration schemes of image sensor with other sensors; 4) calculation methodology and quantity of image sensors. Then, the paper proposes a new scheme of ISPOM for mobile robot — depending merely on image sensors. It takes the advantages of both monocular vision and stereo vision, and estimates the relative position and orientation of moving platform with high precision and high frequency. In a word, ISPOM will gradually speed from research to application, as well as play a vital role in deep space exploration and indoor robot control.     

Efficient bidirectional quantum secure communication with two-photon entanglement

An efficient bidirectional quantum secure communication protocol is proposed with two-photon entanglement. Compared with the previous protocol proposed by Shi et al., our protocol can achieve higher efficiency. Meanwhile, for the same length secret messages, only half of entangled photon pairs need to be prepared in our protocol. And the number of classical bits in public classical communication is also a half of that in the previous protocol. Moreover, the information leakage does not exist in our scheme.     

An integrated microfluidic signal generator using multiphase droplet grating

An integrated and reconfigurable optofluidic signal generator based on multiphase droplet grating is demonstrated in this paper. The chip is fabricated with an inexpensive, optically clear and non-toxic silicone elastomer-polydimethylsiloxane (PDMS) by conventional soft lithography. Droplet grating is formed by a stream of plugs which are generated through a typical microfluidic T-junction. Since the refractive indices of the two immiscible liquids are different, the alternative mobility of the plug results in the periodical change of the reflectivity at the fluid/PDMS interface. The real-time tunability in the frequency and amplitude of the signal can be realized by varying the flow rates of the liquids. In experiments, both rectangle and triangle signals are displayed and the signal frequency ranges from 1 to 525 Hz. This signal generator can be easily integrated into other microfluidic networks to create versatile functionalities. Furthermore, we present coding functions based on the signal generator on a chip. Such a signal generator has great potential as a signal source or a part of functionalities for lab-on-a-chip applications.     

浅谈公文格式新国标的主要变化及在实际工作中的实用

本文主要阐明了2012年7月1日实施的《党政机关公文格式》(GB/T9704-2012)与1999年发布实施的《国家行政机关公文格式》(GB/T9704-1999)的主要区别,明确了新国标在实际工作中遇到的主要问题,并提出了解决方案,提高公文处理人员的实际操作能力。