检索结果-内蒙古大学图书馆

Model and Simulation of Multipath Error in DLL for GPS Receiver

Chinese Journal of Electronics 2014年第3期23卷 508-515页

作者： CHENG Lan CHEN Jie XIE Gang Taiyuan University of Technology Education Ministry Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology

Although different multipath error models of Delay lock loop(DLL) used in GPS receiver are established, they have never been put together for comparison. Furthermore, no universal simulation method is developed to get a fair comparison among these models. A new model with implicate expression is hence proposed for the coherent DLL and the noncoherent Dot-product(DOT) power mode DLL. Meanwhile, a new simulation method based on the anonymous function in Matlab, which is especially suitable for models with implicit expression,is also proposed to compare the new model with the existing ones. The theoretical analysis and simulation results show that the existing models are the special case of the proposed one. The new simulation method can be used for the comparison of different multipath error models and the multipath error analysis of other DLLs for which only the implicit model is available.

关键词： Delay lock loop(DLL) Multipath Multipath error model Positioning system

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Data-Based Health State Analysis for the Axle of High Speed Train

Data-Based Health State Analysis for the Axle of High Speed ...

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International Conference on Computational Intelligence and Security

作者： Guo Xie Minying Ye Xinhong Hei Jinwei Zhao Fucai Qian Xi'an University of Technology Xi'an China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi'an China

Taking into account that the present popular methods, such as the judgement of the axle failure based on temperature threshold, and the early warning of axle based on real-time temperature analysis, cannot analyze the changing of performance trends, a health state analysis method for the axle of high-speed train based on long-term temperature monitoring data is proposed in this paper, which including the following main steps: (1) Preprocessing of the original data to correct the singular zero value and complement the missing values, (2) Smoothing of the processed data in order to automatically extract the beginning and end points of every temperature rising stage of axles, (3) Establishment of the calculation method of temperature rising rate, and evaluating the health sate of axles based on the temperature rising rate. Finally, the proposed method is validated based on the data from a test line, the results demonstrate the effectiveness and practicability of the method.

关键词： Axles Temperature distribution Aging Safety Data mining Fault diagnosis Monitoring

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Mechanical design of aerial dispersal miniature reconnaissance robot launch module

Mechanical design of aerial dispersal miniature reconnaissan...

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International Conference on Information and Automation (ICIA)

作者： Haojian Lu Junyao Gao Jingchao Zhao Yi Liu Xin Li Zhe Xu Haoxiang Cao Fangzhou Zhao Xuanyang Shi Luyao Wang Key Laboratory of Intelligent Control and Decision of Complex System Beijing China Ministry of Education Beijing Institute of Technology Beijing China

Aerial dispersal miniature reconnaissance robots can be used in many areas such as natural disasters, man-power disasters, military reconnaissance and so on. Due to its characteristics of fast response, long detection distance and large coverage area, aerial dispersal miniature reconnaissance robots are suitable for these situations mentioned above. However, aerial dispersal miniature reconnaissance robots demand a portable system which is easy to operate. Moreover, another crucial problem from the aerial dispersal miniature reconnaissance robot is that it demands excellent anti-impact property so that it can be thrown from high altitude. To solve the problems above, this paper presents a framework of this aerial dispersal miniature reconnaissance robot launch module. In addition, the mechanical design of each part of this launch module is presented in this paper. Finally, both simulation and experiments showed that this aerial dispersal miniature reconnaissance robot launch module is reliable and practical.

关键词： Reconnaissance Mobile robots Robot sensing systems Wheels Stress Finite element analysis

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Comparison of Four Text Classifiers on Movie Reviews

Comparison of Four Text Classifiers on Movie Reviews

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International Conference on Applied Computing and Information technology/International Conference on Computational Science and Intelligence (ACIT-CSI)

作者： Yaguang Wang Wenlong Fu Aina Sui Yuqing Ding Information Engineering School Communication University of China Ministry of Culture Key Laboratory of Acoustic Visual Technology and Intelligent Control System

ISBN: (纸本)9781467396431

Text Categorization plays an important role in the fields of information retrieval, machine learning, natural language processing, data mining and others. With the development of computer and information technology, there have been many classification algorithms. Each text classification algorithms will get result at differing speeds and efficiency due to the various feature of test text. It has been found that Naive Bayes classifier has a higher accuracy and rate by classifying Movie Reviews in NLTK using Decision Tree classifier, Naive Bayes classifier, Maximum Entropy classifier and K-nearest neighbor classifier.

关键词： Entropy Classification algorithms Decision trees Text categorization Accuracy Motion pictures Training

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Adaptive robust control for electrical cylinder with friction compensation usingmodified LuGre model

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Journal of Beijing Institute of technology 2014年第3期23卷 358-367页

作者：郝仁剑王军政赵江波汪首坤 Key Laboratory of Intelligent Control and Decision of Complex System School of AutomationBeijing Institute of Technology

The position tracking control problem of an electrical cylinder in the presence of dynamic friction nonlinearities in its transmission process is addressed in this paper. First, a torque decou- piing approach is proposed to formulate the dynamic model. Secondly, to compensate the friction in the case of servo motion, a modified LuGre model is designed to make a continuous transition be- tween a static model at a high speed and a LuGre model at a low speed to avoid instability due to dis- cretization with a finite sampling rate. To accelerate the speed of estimating time-varying parame- ters, a fast adaption law is proposed by designing an attraction domain around a rough value related to the load force. Finally, a discontinuous projection based adaptive robust controller is synthesized to effectively handle parametric uncertainties for ensuring a guaranteed robust performance. A Lya- punov stability analysis demonstrates that all signals including tracking errors have the guaranteed convergent and bounded performance. Extensive comparative simulations with sinusoidal and point- point tracks are obtained respectively in low and high speeds. The results show the effectiveness and the achievable control performance of the proposed control strategy.

关键词： adaptive robust electrical cylinder friction compensation LuGre model

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Research on data interaction of stage visual-effect equipment control system

Research on data interaction of stage visual-effect equipmen...

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International Conference on Electronics Information and Emergency Communication

作者： Yujian Jiang Zhonghao Hu Wei Jiang Yingwei Zhang Information Engineering School Communication University of China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Ministry of Culture Beijing Key Laboratory of Modern Entertainment Technology Beijing China

With continuous development of the visual presentation technology on stage, special effect devices have occupied an important place already. In contrast to traditional mutually independent control method, we propose and realize, in this paper, an integrated-control system of stage effect devices. This system ultimately achieve the effect of unified and cooperative control. In addition, we also further discuss work flows and data flows of this system's software console.

关键词： Software Performance evaluation Monitoring Universal Serial Bus Visualization Hardware Presses

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Model Checking of Software Development in Distributed Animation Rendering system

Model Checking of Software Development in Distributed Animat...

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2015 4th National Conference on Electrical,Electronics and Computer Engineering(NCEECE 2015)

作者： Zhiguo Hong Yongbin Wang Minyong Shi School of Computer Faculty of Science and EngineeringCommunication University of China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Ministry of Culture Beijing Key Laboratory of Modern Entertainment Technology

ISBN: (纸本)9781510819085

Distributed animation rendering systems are used to speed up of rendering i.e the computational-intensive phase of producing animation. How to develop softwares with high availability and efficiency is a hot topic in distributed animation rendering systems. In this paper, based on model checking method for system modeling, three modules(i.e. rendering management server, rendering nodes and storage system) are modeled and analyzed. Firstly, by analyzing the system's typical infrastructure, messages-driven finite state machines of such three modules are studied. Then, the properties of such three modules are described using CTL(Computational Tree Logic). Furthermore, safety and livenesses are verified with SMV(Symbolic Model Verification). The methodology of this paper offers important theoretical guide to software development.

关键词： model checking animation rendering SMV the state machine

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Motion capture data reveal the important role of waist flexibility in human gait

Motion capture data reveal the important role of waist flexi...

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IEEE International Conference on Cyber technology in Automation, control, and intelligent systems

作者： Daoxiong Gong Long Fu Guoyu Zuo Yuqian Du Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing University of Technology Beijing China College of Electronic Information and Control Engineering

ISBN: (纸本)9781479987313

In order to realize the human-like locomotion of humanoid, it is crucially important to study the gait patterns as well as stance control strategies of human walking from the human motion capture data so as to transfer them to humanoid. In this paper, we use a specially designed wearable motion capture system, which can simultaneously capture the motion of the lower limbs in the joint space, the stance of the pelvis and the back in the Descartes space, and the forces exerted on the sole of foot, to capture the motion data of subjects; and the captured walking data reveal some interesting gait patterns of human, in which the role of waist flexibility in human gait is remarkable. Thus we suggest that we should pay attention to the study of the mechanism of waist flexibility in human gait as well as the method of transferring the waist flexibility to humanoid.

关键词： Legged locomotion Joints Pelvis Foot Humanoid robots Sensors

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Fiber faults diagnosis based on correlation detection in passive optical network

Fiber faults diagnosis based on correlation detection in pas...

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International Conference on Optical Communications and Networks (ICOCN)

作者： Xiaogang Yi Anbang Wang Tong Zhao Yuncai Wang University of Technology Shanxi Province China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Shanxi Province Taiyuan

ISBN: (纸本)9781467373746

In this paper, we review the correlation detection technique (CDT) for fiber faults diagnosis and describe our chaotic signal- and communication signal-based correlation detection schemes in passive optical network (PON). The results show that spatial resolution of 2cm and dynamic range of about 20.8dB can be achieved when chaotic signal is used. Utilizing communication signal itself as the probe light, we achieve a spatial resolution of 8cm and detection range of above 23km.

关键词： Correlation Passive optical networks Chaotic communication Optical fibers Spatial resolution

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Effects of the pectus excavatum on the spine in patients of pectus excavatum with scoliosis

Effects of the pectus excavatum on the spine in patients of ...

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第十一届全国生物力学学术会议暨第十三届全国生物流变学学术会议

作者： Weihong Zhong Jinduo Ye Jifu Liu Chunqiu Zhang Linwei Lü Chunyue Zhang Bolun Liu Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems Tianjin University of Technology Military General Hospital of Beijing PLA

Objective:Pectus excavatum(PE)is the most frequently observed congenital deformity of the chest with a deep depression of the sternum in the anterior thoracic *** more than 20%of pectus excavatum patients were reported to have *** to now,no comprehensive analysis about the impact that pectus excavatum has on scoliosis has been performed,although previous research has involved correlation among scoli-

关键词： Effects of the pectus excavatum on the spine in patients of pectus excavatum with scoliosis

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