Formation control and collision avoidance for a class of multi-agent systems     

Yutong Liu  Hongjun Yu  Peng Shi  Cheng-Chew Lim 《Journal of The Franklin Institute》2019,356(10):5395-5420

In this paper, a control scheme is proposed for a group of elliptical agents to achieve a predefined formation. The agents are assumed to have the same dynamics, and communication among the agents are limited. The desired formation is realized based on the reference formation and the mapping decision. In the control design, searching algorithms for both cases of minimum distance and tangents are established for each agent and its neighbors. In order to avoid collision, an optimal path planning algorithm based on collision angles, and a self-center-based rotation algorithm are also proposed. Moreover, randomized method is used to provide the optimal mapping decision for the underlying system. Two examples and analyses are presented to demonstrate the effectiveness and potential of the new control scheme.  相似文献   

ATP translocation and chloroplast biology     

Chia P Voon  Boon L Lim 《国家科学评论(英文版)》2019,6(6):1073

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Impact of combining data from multiple instruments on performance of patient-based real-time quality control     

Qianqian Zhou  Tze Ping Loh  Tony Badrick  Chun Yee Lim 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2021,31(2)

IntroductionIt is unclear what is the best strategy for applying patient-based real-time quality control (PBRTQC) algorithm in the presence of multiple instruments. This simulation study compared the error detection capability of applying PBRTQC algorithms for instruments individually and in combination using serum sodium as an example.Materials and methodsFour sets of random serum sodium measurements were generated with differing means and standard deviations to represent four simulated instruments. Moving median with winsorization was selected as the PBRTQC algorithm. The PBRTQC parameters (block size and control limits) were optimized and applied to the four simulated laboratory data sets individually and in combination.ResultsWhen the PBRTQC algorithm were individually optimized and applied to the data of the individual simulated instruments, it was able to detect bias several folds faster than when they were combined. Similarly, the individually applied algorithms had perfect error detection rates across different magnitudes of bias, whereas the error detection rates of the algorithm applied on the combined data missed smaller biases. The performance of the individually applied PBRTQC algorithm performed more consistently among the simulated instruments compared to when the data were combined.DiscussionWhile combining data from different instruments can increase the data stream and hence, increase the speed of error detection, it may widen the control limits and compromising the probability of error detection. The presence of multiple instruments in the data stream may dilute the effect of the error when it only affects a selected instrument.  相似文献   

Jon Lauglo, Peter Lang, Frankfurt, Se-Yung Lim, Klaus Schaack (Eds.), Education, Training and Contexts Studies and Essays, ISBN 3-631-39547-7, US edn 0-8204-5981-X, 2002 (433pp.)..     

Jon Lauglo  Peter Lang  Frankfurt  Se-Yung Lim  Klaus Schaack  Education  Training  Contexts Studies  Essays  ISBN ---  US edn ---X  . 《International Journal of Educational Development》2005,25(6):669-670

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提心吊胆的华尔街     

Paul  J.Lim  周仲林 《海外英语》2004,(8):14-15

The war in Iraq, terrorism, rising oil prices-and now the threat of higher interest rates-are all preying on the market. There comes a point in virtually every bull market when  相似文献   

从孟、荀看战国儒家政治文化之演进     

林孝宣 《天津师范大学学报(社会科学版)》2002,(5):6-9

孟子与荀子的政治观从表面上看大多是对立的，但在实际上并不矛盾，他们往往说的不是一个层面上的问题。就其政治大思路而言，二者是一致的，都倡导人治，都是道德主义的，有其“同归而殊途”的内在逻辑。  相似文献   

Examining Teachers' Use of iPads: Comfort Level,Perception, and Use     

Min Liu  Cesar C. Navarrete  Robert Scordino  Jina Kang  Yujung Ko  Mihyun Lim 《Journal of Research on Technology in Education》2016,48(3):159-180

While there is evidence of the growing popularity of iPads and other tablets in K–12 education, little is understood about how teachers use these devices in their instruction. This study examines 342 teachers' comfort level with and perception toward iPad use and any changes that occurred over the implementation year. Using a mixed-methods design, this study found significant differences in comfort level by years of teaching and school levels. Female teachers, teachers with 20 years or less of teaching experience, and elementary school teachers were more positive about their perception toward iPad use than the other groups. High school teachers' perception was the lowest overall. Analyses of teacher interviews revealed affordances, challenges, and diverse ways of how teachers used iPads in their instruction. Implications for practice and research are discussed.  相似文献   

Instructional design,facilitation, and perceived learning outcomes: an exploratory case study of a human trafficking MOOC for attitudinal change     

Sunnie Lee Watson  Jamie Loizzo  William R. Watson  Chad Mueller  Jieun Lim  Peggy A. Ertmer 《Educational technology research and development : ETR & D》2016,64(6):1273-1300

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Promoting socially shared metacognitive regulation in collaborative project-based learning: a framework for the design of structured guidance     

Dongho Kim  Cheolil Lim 《Teaching in Higher Education》2018,23(2):194-211

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Stress analysis of anisotropic thick laminates in cylindrical bending using a semi-analytical approach   总被引：1，自引：0，他引：1  

LU Chao-feng LIM C.W. XU Feng 《浙江大学学报(A卷英文版)》2007,8(11):1740-1745

Semi-analytical elasticity solutions for bending of angle-ply laminates in cylindrical bending are presented using the state-space-based differential quadrature method (SSDQM). Partial differential state equation is derived from the basic equations of elasticity based on the state space concept. Then, the differential quadrature (DQ) technique is introduced to discretize the longitu- dinal domain of the plate so that a series of ordinary differential state equations are obtained at the discrete points. Meanwhile, the edge constrained conditions are handled directly using the stress and displacement components without the Saint-Venant principle. The thickness domain is solved analytically based on the state space formalism along with the continuity conditions at interfaces. The present method is validated by comparing the results to the exact solutions of Pagano’s problem. Numerical results for fully clamped thick laminates are presented, and the influences of ply angle on stress distributions are discussed.  相似文献