A Cellular Automata Based Rainfall-Runoff Model for Urban Inundation Analysis Under Different Land Uses

Recently many runoff models based on cellular automaton (CA) have been developed to simulate floods; however, the existing models cannot be readily applied to complex urban environments. This study proposes a novel rainfall-runoff model based on CA (RRCA) to simulate inundation. Its main contributions include a fine runoff generation process that considers 12 urban scenarios rather than a single land use type and the confluence process determined by the new transition rules considering water supply and demand (WS-WD transition rules). RRCA was compared with another CA based flood model (E2DCA). With the benchmark model, the results showed that there was good agreement, with an R-squared greater than 0.9, and that RRCA was more sensitive to waterlogging levels than E2DCA. Furthermore, the simulated vegetation interception, infiltration and drainage processes had varying degrees of impact on waterlogging. Corresponding measures can be taken in urban flood management according to the identification of areas experiencing drainage difficulties.

     

Entity-level sentiment prediction in Danmaku video interaction

The Journal of Supercomputing - Sentiment analysis in Danmaku video interaction aims at measuring public mood in respect of the video, which is helpful for the potential applications in behavioral...     

Granular multiple kernel learning for identifying RNA-binding protein residues via integrating sequence and structure information

Neural Computing and Applications - RNA-binding proteins play an important role in the biological process. However, the traditional experiment technology to predict RNA-binding residues is...     

基于Matlab/Simulink的硬件在回路无人机仿真系统设计

随着无人机在军事和民用领域的应用前景,高效率的地面控制操控训练替代实装飞行是保证系统安全、提高效率和节省经费的重要手段,针对无人机飞行控制系统仿真的特点和人在回路仿真系统的要求,提出利用Matlab/Simulink提供仿真环境进行人在回路的无人机仿真系统的设计方案,该方案将PC机作为实时飞控系统,从而将其作为飞行控制的仿真平台,相对于传统手工编写代码的方式,基于Simulink模块构建的仿真模型具有灵活、快速、高效和低成本等特点,对无人机模拟训练系统中飞行动态仿真模型的设计和人在同路的仿真训练具有很高的实用价值.     

一种新的无线电高度表原位检测的高度模拟方法

针对目前对高度表进行原位检测的需求,设计了一种新的高度模拟方法;该方法的实现以ARM为核心,通过高度模拟电路产生各种需要的高度电压信号,从而达到高度模拟的目的,并且无需对机载高度表进行拆装,操作简单、快捷、可靠性较高;实验结果表明,这种方法的高度模拟精度较高,具有一定的实用价值和经济效益.     

Human motion retrieval from hand-drawn sketch

The rapid growth of motion capture data increases the importance of motion retrieval. The majority of the existing motion retrieval approaches are based on a labor-intensive step in which the user browses and selects a desired query motion clip from the large motion clip database. In this work, a novel sketching interface for defining the query is presented. This simple approach allows users to define the required motion by sketching several motion strokes over a drawn character, which requires less effort and extends the users’ expressiveness. To support the real-time interface, a specialized encoding of the motions and the hand-drawn query is required. Here, we introduce a novel hierarchical encoding scheme based on a set of orthonormal spherical harmonic (SH) basis functions, which provides a compact representation, and avoids the CPU/processing intensive stage of temporal alignment used by previous solutions. Experimental results show that the proposed approach can well retrieve the motions, and is capable of retrieve logically and numerically similar motions, which is superior to previous approaches. The user study shows that the proposed system can be a useful tool to input motion query if the users are familiar with it. Finally, an application of generating a 3D animation from a hand-drawn comics strip is demonstrated.     

Effect of an increase in the nitrogen content of the working gas on the microstructure of reactive sputtered TiN thin films

TiN films were deposited on (100)-Si substrates by RF-reactive sputtering. The effects of processing parameters and substrate orientation on the stoichiometry, resistivity and microstructure of reactively sputtered TiN thin films were investigated. The RF-power was fixed at 50 W, and the nitrogen content in the working gas was adjusted so that target nitridation occurred at a relatively low nitrogen content, 2.6% N₂, in a fixed total flow rate of gases of 46.25 standard cubic centimetres (sccm). The N₂ percentage was varied from 2.6% to 15.4%. The films were continuous and 200 nm thick. Films deposited with the substrate facing the target exhibited 111-texturing, while films on substrates lying in the same plane of the target surface had 100-texturing. Both X-rays photoelectron spectroscopy and high-resolution detailed scans of the Auger electron energy spectrum were used for the stoichiometry determination. On the 100-textured TiN films, the N/Ti ratio was 1.0 at low N₂ flow rates; the N/Ti ratio rapidly increased with N₂ flow rate, and then levelled off. The films had resistivities ranging from 85 to 1340 µ cm, and the functional dependence of both N/Ti and the resistivity values behaved similarly with increasing N₂. X-ray single-line profile analysis of the 200-reflection indicated that the average crystallite size decreased and the average strain increased with increasing nitrogen content in the working gas. The Si/TiN structures were heat treated in the temperature range from 300 to 600°C in a quartz tube under 1 atm (10⁵Pa) of flowing high purity Ar gas. Heat treatment at 300°C did not affect the TiN film integrity, while treatment at 400–600°C resulted in void-type defects.     

火炮磁流变后坐系统仿真

将磁流变技术应用于火炮反后坐装置是目前正在发展的一种降低火炮后坐力的新技术,优化火炮反后坐装置控制,达到实时调节阻力。针对某型号火炮,在建立动力学模型和电磁模型的基础上设计了磁流变反后坐系统。为实现理想的后坐控制规律,提出了PID和模糊控制算法。利用ADAMS和MATLAB进行联合仿真,仿真结果表明,在后坐行程范围内,最大后坐阻力分别为3.71×105N,3.53×105N,相比传统火炮减小了13%和17%,并且模糊控制的后坐阻力曲线具有良好的"平台效应",实现了控制目标,表明磁流变阻尼器良好的可控性和应用于火炮后坐系统中的可行性。     

有限遥测速率下卫星遥测数据设计方法研究

针对国内小卫星常用的统一遥测模式,讨论了在遥测速率受限的条件下,分包遥测格式设计应满足的基本条件;定义了分包遥测数据格式设计过程中的包编码损失率,并以此作为包数据格式编码效率的评价函数;分析了分包遥测数据格式设计过程中包长度、包采样周期等参数变化对评价函数的影响,进而给出了分包遥测数据格式设计中的应满足的条件和遵循的原则。     

基于9种无约束优化算法的岩爆预测BP模型优选

为研究不同训练样本数量和无约束优化算法对岩爆BP(Back Propagation)神经网络模型预测准确率的影响,选取围岩最大切向应力与岩石单轴抗压强度比σθ/σc、岩石单轴抗压强度与单轴抗拉强度比σc/σt和弹性能量指数Wet作为预测指标,广泛搜集整理100组典型岩爆实例建立了训练样本数据库.在样本数量分别为40、70和100时,基于标准算法和9种无约束优化算法建立了10个岩爆BP神经网络预测模型,并提出了考虑不同样本规模影响的岩爆烈度等级预测指数——综合准确值N.比较研究结果表明:BP模型的预测准确率随样本数量增加而提高,3种样本数量下的模型平均预测准确率分别为62.5％、76.4％和87.5％;基于9种优化算法建立的BP网络模型的N值均高于标准BP模型;基于Ploak-Ribiere共轭梯度法优化的BP模型的N值(195)和预测准确率(99.0％)均最高,且在5个工程实例中的预测结果完全符合现场实际,优于标准BP模型、支持向量机模型和其他优化模型,为岩爆烈度等级预测的最佳模型.