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排序方式: 共有51条查询结果,搜索用时 15 毫秒
1.
传统的像素级变化检测方法的检测性能受到以下因素的严重制约: 图像辐射差异、配准误差和差异图像分类门限的选取, 并且难以从检测信息中提取出关键的变化. 本文针对遥感图像中人造目标的变化检测问题, 提出了一种综合特征级和像素级的两步变化检测算法. 首先将大幅多时相遥感图像分成一系列子图像对, 采用有监督子图像对分类方法, 提取人造目标变化的感兴趣区域, 然后采用像素级变化检测算法对感兴趣区域进行变化检测, 得到定量的检测结果. 实验结果表明了该算法的可行性和有效性. 相似文献
2.
分布式测量系统服务窗口动态调度方法研究 总被引:1,自引:1,他引:0
在网络制造环境下, 动态时间性能是测量系统的重要指标. 针对基于 CORBA (Common object request broker architecture) 和尺寸测量接口标准 (Dimensional measurement interface standard, DMIS) 的分布式测量系统 (Distributed measurement system, DMS), 根据多用户非抢占优先排队网络静态性能模型, 提出基于无穷小摄动分析的样本轨道划分方法, 建立测量系统服务窗口的动态调度算法, 实现测量系统的时间性能调优. 通过在一个制造工厂中进行的应用实验, 证明了此方法的有效性. 相似文献
3.
4.
In this paper, time delay interconnected systems are considered where the nominal isolated subsystems are fully nonlinear. The interconnections and the matched and mismatched disturbances are nonlinear and time-delayed. A decentralised static output feedback control strategy is proposed to stabilise the resulting interconnected system uniformly asymptotically. A novel approach is proposed to deal with the interconnections by introducing artificial interconnections, such that accessible information is fully exploited in the control design to reduce conservatism. Simulation results show the effectiveness of the proposed approach. 相似文献
5.
Xing-Gang Yan 《International journal of control》2013,86(4):591-606
In this paper, robust decentralized actuator fault detection and estimation is considered for a class of non-linear large-scale systems. A sliding mode observer is proposed together with an appropriate coordinate transformation to find the sliding mode dynamics. Then, based on the features of the observer, a decentralized fault estimation strategy is proposed using an equivalent output error injection, and a decentralized reconstruction scheme follows by further exploiting the structure of the uncertainty which is allowed to have non-linear bounds. The estimation and reconstruction signals only depend on the available measured information and thus the proposed strategy can work on-line. The theoretical results which have been obtained are applied to an automated highway system. Simulation shows the feasibility and effectiveness of the proposed scheme. 相似文献
6.
Xing-Gang Yan Author Vitae 《Automatica》2003,39(1):91-99
In this paper, a class of nonlinear interconnected systems with similar structure is considered. The interconnected system consists of matched and mismatched uncertainties. Based on constrained Lyapunov equations and by exploiting the structure of the interconnected system, a continuous output feedback reduced-order control scheme is presented to stabilize the system robustly. Our approach allows more general forms of known and uncertain interconnections than existing work. The effectiveness of the proposed reduced-order control scheme is illustrated through a numerical example. 相似文献
7.
Xing-Gang Jiang Susan T. Yang James C. Earthman Farghalli A. Mohamed 《Metallurgical and Materials Transactions A》1996,27(4):863-872
In this investigation, the ductility and cavitation behavior of five grades of the superplastic Zn-22 pct Al were studied
under identical conditions of grain size, temperature, and initial strain rate. These five grades were prepared from high-purity
Al and Zn using the same procedure but different Fe impurity levels; grades A, B, C, D, and E contain 1, 40, 120, 400, and
1460 ppm of Fe, respectively. A comparison between the present results and those reported earlier for the creep behavior of
the five grades of Zn 22 pct Al demonstrates that while the presence of Fe has no noticeable effect on the steady-state creep
rates during deformation in the superplastic region (where maximum ductility occurs), it has a pronounced effect on the ductility
and fracture behavior of the alloy. The experimental data show that there is a significant drop in the average elongation
to fracture when Fe concentration exceeds 125 ppm, and that the ductility of grade E is approximately 50 pct of grade A for
initial strain rates less than 10−2 s−1. In addition, the data reveal two important findings regarding cavitation behavior. First, neither the initial grain size
nor the occurrence of grain growth has an effect on cavitation that is as significant as that arising from the presence of
excessive impurities. Second, the presence of other impurities in addition to Fe in Zn-22 pct Al has the effect of enhancing
cavitation. The effect of Fe, alone or in the presence of other impurities, on ductility and cavitation in Zn 22 pct Al is
examined in terms of phenomena associated with impurity segregation at boundaries.
Formerly Research Associate, Materials Section, Department of Mechanical and Aerospace Engineering, University of California,
Irvine, CA
Formerly Graduate Research Assistant, Materials Science & Engineering, Department of Chemical and Biochemical Engineering,
University of California, Irvine, CA
This article is based on a presentation made at the “High Temperature Fracture Mechanisms in Advanced Materials” symposium,
as a part of the 1994 Fall meeting of TMS, October 2-6, 1994, in Rosemont, Illinois, under the auspices of the ASM/SMD Flow
and Fracture Committee. 相似文献
8.
Deploy Efficiency Driven k-Barrier Construction Scheme Based on Target Circle in Directional Sensor Network 下载免费PDF全文
Fan Xing-Gang Che Zhi-Cong Hu Feng-Dan Liu Tao Xu Jin-Shan Zhou Xiao-Long 《计算机科学技术学报》2020,35(3):647-664
Journal of Computer Science and Technology - With the increasing demand for security, building strong barrier coverage in directional sensor networks is important for effectively detecting... 相似文献
9.
一种面向对象的被管网络资源的管理维护模型 总被引:2,自引:0,他引:2
使用面向对象的方法将网络管理信息抽象为两个层次-被管对象层和网管对象层,其中被管对象层是对被管网络资源的抽象,并给出了被管对象,被管对象语义的定义,分类和描述,设计了基于被管对象语义对被管对象进行管理和维护结构模型。 相似文献
10.
农药对农产品营养和风味的影响 总被引:1,自引:0,他引:1
农药对防控农作物病虫草害、促进农产品高产贡献巨大,然而其大量使用常导致农产品农药残留、环境污染,同时还对农产品营养品质及风味造成影响,如改变农产品营养成分,导致农产品产生异味等变化等,应当引起重视。本文综述了农药对农产品营养物质及风味的影响及机制探究,以期为农产品安全及质量品质保障提供理论参考,为农药科学使用提供合理建议。开展农药对农产品营养品质及风味评价及作用机制研究,改善和提升农产品品质和营养水平,将是该领域未来研究的方向。 相似文献