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Search Results: 1 - 10 of 108343 matches for " Xiao Chen "
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Probabilistic Fuzzy Control of Mobile Robots for Range Sensor Based Reactive Navigation  [PDF]
Chunlin Chen, Tiaojun Xiao
Intelligent Control and Automation (ICA) , 2011, DOI: 10.4236/ica.2011.22009
Abstract: In this paper, a probabilistic fuzzy approach is proposed for mobile-robot reactive navigation using range sensors. The primary motivation is an integrated reactive navigation control system with good real-time performance under uncertainty. To accomplish this aim, a probabilistic fuzzy logic system (PFLS) is introduced to range measurement and reactive navigation in local environments. PFLS is first adopted to handle the fuzzy and stochastic uncertainties in range sensors and to provide more precise distance information in unknown environments. Consequently these sensor data are sent to a probabilistic fuzzy rule-based inference system with reactive behaviors for local navigation. The feasibility and effectiveness of the proposed approach are verified by simulation and the experiments on a real mobile robot.
Promoting Balance in Output Efficiencies for Cross-Efficiency Evaluation in Data Envelopment Analysis  [PDF]
Jin-Xiao Chen
Journal of Applied Mathematics and Physics (JAMP) , 2019, DOI: 10.4236/jamp.2019.73047
Abstract: Cross-efficiency evaluation is recognized as an effective way of efficiency assessment for a set of decision making units (DMUs) in the framework of data envelopment analysis (DEA). It has been generally suggested that secondary goals be introduced for cross-efficiency evaluation owing to the non-uniqueness of optimal solutions in self-evaluation. This paper develops a variety of secondary goals in the spirit of promoting balance in the output efficiencies of the DMU under evaluation. The proposed models attempt to make each output contribute as equally as possible to the self-evaluated efficiency. In this way, the weight flexibility can for one thing be reduced by the introduced secondary goals with selections from alternate optimal solutions, in addition to counting on the dilution of flexibility in the subsequent peer-evaluation. The proposed approach might be applicable to evaluation problems in which multiple outputs are considered important and balance is encouraged to put all dimensions into sufficient use. The effectiveness of the proposed approach and its comparisons with some relevant secondary goals are illustrated empirically using numerical examples.
Ultrasonic Guided Waves in Piezoelectric Layered Composite with Different Interfacial Properties
Xiao Chen
Advances in Materials Science and Engineering , 2011, DOI: 10.1155/2011/701819
Abstract: Combining the propagation model of guided waves in a multilayered piezoelectric composite with the interfacial model of rigid, slip, and weak interfaces, the generalized dispersion characteristic equations of guided waves propagating in a piezoelectric layered composite with different interfacial properties are derived. The effects of the slip, weak, and delamination interfaces in different depths on the dispersion properties of the lowest-order mode ultrasonic guided wave are analyzed. The theory would be used to characterize the interfacial properties of piezoelectric layered composite nondestructively. 1. Introduction The acoustic wave propagation in piezoelectric materials has received considerable attention from engineering and scientific communities involved in nondestructive evaluation and transducer design. Numerous ultrasonic devices using piezoelectric materials are currently being developed for a variety of applications, such as SAW filters, ultrasonic transducers, and a variety of physical, chemical, and biological sensors [1, 2]. In aerospace and other structural applications, piezoelectric layered smart or intelligent composites are being used [3]. Many of these applications involve layered structures made up of piezoelectric materials. Layered composite materials are usually made of different materials. Very thin adhesive interfacial layer serves as the bonding between adjacent layers. Some imperfections, such as cracks and small voids, often emerge at the interface and contribute to the fatigue of the composite. The interfacial property between layers is one of the key factors that determine the structural stability of composites. It is, therefore, very important to characterize the adhesive layer quality, which has been a main topic in nondestructive testing and evaluation of composite materials [4–8]. Ultrasonic wave is a mechanical wave, which reflects the elastic properties of the medium. The interfacial mechanical property is closely related to the coupling strength between layers in the structure and the level of acoustic impedance match between the bonding layer and the piezoelectric material. Because of its deep penetration ability, ultrasonic technique is among the most promising nondestructive evaluation methods for the interfacial layer characterization. There are some papers considering the wave propagation in this structure with perfect interface, that is, the stress and displacement across the interface are continuous [9–11]. This paper is concerned with the guided waves propagating in piezoelectric layered composite with
Theory and Practice of Chinese-English Bilingual Teaching in Circuit Course
Xiao Chen
International Education Studies , 2008, DOI: 10.5539/ies.v1n4p53
Abstract: The Chinese-English bilingual teaching in the circuit course is an important approach to foster innovational talents for the electronic industry in the new century. In this article, we analyze the background, applicability and feasibility of bilingual teaching in the course of circuit and the difficulties facing in the process of implementation. We explore various approaches and methods to overcome these difficulties and obtain better effects from many aspects such as teaching materials, teachers, teaching method and students. Taking the teaching contents of the first chapter in the course of circuit as an example, we adopt new Chinese-English bilingual teaching system and modes to make students grasp the basic theory and method of circuit, foster students’ English thinking abilities, combine the theoretic teaching of scientific and technologic English and the theoretic teaching of circuit, and enhance students’ international competitive consciousness and international competitive ability.
On Design Experiment Teaching in Engineering Quality Cultivation
Xiao Chen
International Education Studies , 2008, DOI: 10.5539/ies.v1n3p49
Abstract: Design experiment refers to that designed and conducted by students independently and is surely an important method to cultivate students’ comprehensive quality. According to the development and requirements of experimental teaching, this article carries out a study and analysis on the purpose, significance, denotation, connotation and characteristics of design experiment and then elaborates on the general design methods and specific steps in this kind of experiment. By practicing in design experiment, students will have their abilities in innovation and scientific research as well as comprehensive engineering diathesis improved.
Design of Temperature Monitor Device for DC Source Based on 1-Wire Bus
Xiao Chen
Computer and Information Science , 2009, DOI: 10.5539/cis.v1n4p31
Abstract: The structure of X6000 DC source system is introduced. A temperature monitor device for its storage pile based on 1-wire bus is designed. Its central processing unit is single chip microcomputer 80296SA in the monitor unit of this DC source. The DS1822 chip, a kind of digital thermometer chip based on 1-wire bus, is used to measure the temperature of the X6000 DC source system storage pile. The hardware, interface and software are designed and the condition description of the interface routine and realization are given. The system possesses of many advantages, including its novel structure, simple circuit and expedient control.
Design of Calendar Clock Based on DS12C887 Chip
Xiao Chen
Computer and Information Science , 2009, DOI: 10.5539/cis.v1n3p95
Abstract: The digitization of clock has brought us enormous conveniences and the development of the special-purpose clock chip would extend the traditional functions of clock. In this article, we design a new calendar clock based on DS12C887 chip and AT89C52 SCM. The system includes 5 parts: the AT89C52 SCM module, the calendar clock module, the LED display module, serial communication module and the C51 program. The SCM can get real-time information through the correct operations of addressing and the register. Users can set up initial time through serial communication between the PC and SCM. The LED unit is used to displa
On a geometric realization of C$^*$-algebras
Xiao Chen
Mathematics , 2015, DOI: 10.1007/s11464-014-0317-2
Abstract: Further to the functional representations of C$^*$-algebras proposed by R. Cirelli, A. Mania and L. Pizzocchero, we consider in this article the uniform K\"ahler bundle (in short, UKB) description of some C$^*$-algebraic subjects. In particular, we obtain an one-to-one correspondence between closed ideals of a C$^*$-algebra $\mathcal{A}$ and full uniform K\"ahler sub bundles over open subsets of the base space of the UKB associated with $\mathcal{A}$. In addition, we will present a geometric description of the pure state space of hereditary C$^*$-subalgebras and show that that if $\mathcal{B}$ is a hereditary C$^*$-subalgebra of $\mathcal{A}$, the UKB of $\mathcal{B}$ is a kind of K\"ahler subbundle of the UKB of $\mathcal{A}$. As a simple example, we consider hereditary C$^*$-subalgebras of the C$^*$-algebra of compact operators on a Hilbert space. Finally, we remark that hereditary C$^*$-subalgebras also naturally can be characterized as uniform holomorphic Hilbert subbundles.
Multiplicative Iteration for Nonnegative Quadratic Programming
Xiao Xiao,Donghui Chen
Mathematics , 2014,
Abstract: In many applications, it makes sense to solve the least square problems with nonnegative constraints. In this article, we present a new multiplicative iteration that monotonically decreases the value of the nonnegative quadratic programming (NNQP) objective function. This new algorithm has a simple closed form and is easily implemented on a parallel machine. We prove the global convergence of the new algorithm and apply it to solving image super-resolution and color image labelling problems. The experimental results demonstrate the effectiveness and broad applicability of the new algorithm.
Spectral Geometric Triangle Properties of Chlorophyll-A Inversion in Taihu Lake Based on TM Data  [PDF]
Jun Chen, Zhenhe Wen, Zhengqing Xiao
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.31008
Abstract: The main objective of this study was to develop and validate the applicability of the Area Chlorophyll-a Concentration Retrieved Model (ACCRM), Height Chlorophyll-a Concentration Retrieved Model (HCCRM), Angle Chlorophyll-a Concentration Retrieved Model (AgCCRM), and Ratio Model of TM2/TM3 (RM) in estimating the chlorophyll-a concentration in Case II water bodies, such as Taihu Lake in Jiangsu Province, China. Water samples were collected from 23 stations on the 27th and 28th of October, 2003. The four empirical models were calibrated against the calibration dataset (samples from 19 stations) and validated using the validation dataset (samples from 4 stations). The regression analysis showed higher correlation coefficients for the ACCRM and the HCCRM than for the AgCCRM and the Ratio Model; and the HCCRM was slightly superior to the ACCRM. The performance of the ACCRM and the HCCRM was validated, and the ACCRM underestimated concentration values more than the HCCRM. The distribution of chlorophyll-a concentrations in Taihu Lake on October 27, 2003 was estimated based on the Landsat/TM data using the ACCRM and the HCCRM. Both models indicated higher chlorophyll-a concentrations in the east, north and center of the lake, but lower concentrations in the south. The accuracy of results obtained from the HCCRM and the ACCRM were also supported by the validation dataset. The study revealed that the HCCRM and the ACCRM had the best potential for accurately assessing the chlorophyll-a concentration in the highly turbid water bodies.
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