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排序方式: 共有1091条查询结果,搜索用时 15 毫秒
31.
Muzhou Xiong Michael Lees Wentong Cai Suiping Zhou Malcolm Yoke Hean Low 《The Visual computer》2010,26(5):367-383
This paper proposes a rule-based motion planning system for agent-based crowd simulation, consisting of sets of rules for
both collision avoidance and collision response. In order to avoid an oncoming collision, a set of rules for velocity sampling
and evaluation is proposed, which aims to choose a velocity with an expected time to collision larger than a predefined threshold.
In order to improve the efficiency over existing methods, the sampling procedure terminates upon finding an appropriate velocity.
Moreover, the proposed motion planning system does not guarantee a collision-free movement. In case of collision, another
set of rules is also defined to direct the agent to make a corresponding response. The experiment results show that the proposed
approach can be applied in different scenarios, while making the simulation execution efficient. 相似文献
32.
Stefan Mairhofer James Johnson Craig J. Sturrock Malcolm J. Bennett Sacha J. Mooney Tony P. Pridmore 《Machine Vision and Applications》2016,27(5):721-734
We propose a visual object tracking framework for the extraction of multiple interacting plant root systems from three-dimensional X-ray micro computed tomography images of plants grown in soil. Our method is based on a level set framework guided by a greyscale intensity distribution model to identify object boundaries in image cross-sections. Root objects are followed through the data volume, while updating the tracker’s appearance models to adapt to changing intensity values. In the presence of multiple root systems, multiple trackers can be used, but need to distinguish target objects from one another in order to correctly associate roots with their originating plants. Since root objects are expected to exhibit similar greyscale intensity distributions, shape information is used to constrain the evolving level set interfaces in order to lock trackers to their correct targets. The proposed method is tested on root systems of wheat plants grown in soil. 相似文献
33.
对属于NP完全问题的有约束矩形排样问题,国内外多采用计算复杂度较小、时间较快、便于控制问题约束条件的启发式方法.分析了启发式排料算法影响优化程度的原因,提出利用回溯寻求优化零件组合的混合启发式策略,并利用排样过程中产生的小剩余区域划分与合并的方法和现有的矩形排样启发式算法相比,说明该方法可以更大地提高板材的利用率. 相似文献
34.
Sergio L. González-Cortés Tian-Cun Xiao Nick Rees Dora Méhn Malcolm L.H. Green 《Materials Research Bulletin》2005,40(7):1112-1119
The first examples of mesostructured materials containing Mo- and W-oxo-sulphur species incorporated into a poorly ordered MCM-41 framework have been prepared under hydrothermal condition and alkaline medium. The incorporation of oxygen-sulphur derivates of molybdenum and tungsten not only increases significantly the pore diameter, but also improves the thermal stability of the MCM-41-related mesoporous material. 相似文献
35.
Large-scale mapping of boreal forest in SIBERIA using ERS tandem coherence and JERS backscatter data 总被引:3,自引:0,他引:3
Wolfgang Wagner Adrian LuckmanJan Vietmeier Kevin Tansey Heiko BalzterChristiane Schmullius Malcolm Davidson David Gaveau Michael Gluck Thuy Le ToanShaun Quegan Anatoly ShvidenkoAndreas Wiesmann Jiong Jiong Yu 《Remote sensing of environment》2003,85(2):125-144
Siberia's boreal forests represent an economically and ecologically precious resource, a significant part of which is not monitored on a regular basis. Synthetic aperture radars (SARs), with their sensitivity to forest biomass, offer mapping capabilities that could provide valuable up-to-date information, for example about fire damage or logging activity. The European Commission SIBERIA project had the aim of mapping an area of approximately 1 million km2 in Siberia using SAR data from two satellite sources: the tandem mission of the European Remote Sensing Satellites ERS-1/2 and the Japanese Earth Resource Satellite JERS-1. Mosaics of ERS tandem interferometric coherence and JERS backscattering coefficient show the wealth of information contained in these data but they also show large differences in radar response between neighbouring images. To create one homogeneous forest map, adaptive methods which are able to account for brightness changes due to environmental effects were required. In this paper an adaptive empirical model to determine growing stock volume classes using the ERS tandem coherence and the JERS backscatter data is described. For growing stock volume classes up to 80 m3/ha, accuracies of over 80% are achieved for over a hundred ERS frames at a spatial resolution of 50 m. 相似文献
36.
This paper considers the design of feedback controllers for linear, time-invariant, spatially distributed systems in an approach which generalises the H∞-framework and in particular the H∞ loop-shaping method. To this end, we introduce a class of spatially distributed system models called finite dimensional, distributed, linear, time-invariant systems. Sensors and actuators are considered to be part of the controller, rather than part of the plant, and thus the controller we wish to design is itself a spatially distributed system. Optimising over placements and shapes of the sensor and actuator spatial distribution functions is an integrated part of the controller design procedure. As an illustrative design example, we present the feedback stabilisation of an electrostatically destabilised, electrically conducting membrane. 相似文献
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伊拉克鲁迈拉油田CP00注水站设计规模为1 000 m3/h,注水压力为20 MPa。该注水站的设计方案及优化考虑了安全、环保、节能、节省投资等因素。重点介绍了CP00内向注水泵喂水的方案选择及设计优化,以及整体工艺流程的设计。 相似文献