Modeling and Analyzing Web Application with Aspect-Oriented Hierarchical Coloured Petri Nets

Aspect-oriented modeling can uncover potential design faults, yet most existing work fails to achieve both separation and composition in a natural and succinct way. This study presents an aspect-oriented modeling and analysis approach with hierarchical Coloured Petri Nets(HCPN). HCPN has sub-models and well-defined semantics combining a set of submodels. These two characteristics of HCPN are nicely integrated into aspect oriented modeling. Submodels are used to model aspects while the combination mechanism contributes to aspects weaving. Furthermore, the woven aspect oriented HCPN model can be simulated and analyzed by the CPN Tools. A systematic web application case study is conducted. The results show the system original properties are satisfied after weaving aspects and all design flaws are revealed. As such, the approach can support web application design and analysis in an aspect-oriented fashion concisely and effectively.

Transitions in a genotype selection model driven by coloured noises

This paper investigates a genotype selection model subjected to both a multiplicative coloured noise and an additive coloured noise with different correlation time τ1 and τ2 by means of the numerical technique. By directly simulating the Langevin Equation, the following results are obtained. （1） The multiplicative coloured noise dominates, however, the effect of the additive coloured noise is not neglected in the practical gene selection process. The selection rate μ decides that the selection is propitious to gene A haploid or gene B haploid. （2） The additive coloured noise intensity and the correlation time τ2 play opposite roles. It is noted that α and τ2 can not separate the single peak, while can make the peak disappear and ^-2 can make the peak be sharp. （3） The multiplicative coloured noise intensity D and the correlation time τ1 can induce phase transition, at the same time they play opposite roles and the reentrance phenomenon appears. In this case, it is easy to select one type haploid from the group with increasing D and decreasing τ1.

3D fluid model analysis on the generation of negative hydrogen ions for negative ion source of NBI

A radio-frequency(RF) inductively coupled negative hydrogen ion source(NHIS) has been adopted in the China Fusion Engineering Test Reactor(CFETR) to generate negative hydrogen ions.By incorporating the level-lumping method into a three-dimensional fluid model,the volume production and transportation of H^(-) in the NHIS,which consists of a cylindrical driver region and a rectangular expansion chamber,are investigated self-consistently at a large input power(40 k W) and different pressures(0.3–2.0 Pa).The results indicate that with the increase of pressure,the H^(-) density at the bottom of the expansion region first increases and then decreases.In addition,the effect of the magnetic filter is examined.It is noteworthy that a significant increase in the H^(-) density is observed when the magnetic filter is introduced.As the permanent magnets move towards the driver region,the H^(-) density decreases monotonically and the asymmetry is enhanced.This study contributes to the understanding of H-distribution under various conditions and facilitates the optimization of volume production of negative hydrogen ions in the NHIS.

基于去噪扩散概率模型不平衡样本增强的暂态稳定评估

准确有效的电力系统暂态稳定评估对电力系统安全稳定运行具有重要意义。目前,基于深度学习的暂态稳定评估方法面临着时序特征空间表征困难、样本类别严重不平衡等问题,影响到评估结果的可信度。为了弥补现有研究的不足,提出了一种基于去噪扩散概率模型(DDPM)不平衡样本增强的电力系统暂态稳定评估方法。首先,构建改进HSV颜色模型对高维数据进行二维图像化处理,从而直观表征高维数据,便于后续训练;然后,基于DDPM算法对不平衡失稳样本空间进行表征学习,规模化生成概率同分布的增强样本,进而解决类别不平衡问题;最后,提出梯度加权类激活映射卷积神经网络以构建暂态稳定评估模型,提升模型的可信度与可解释性。IEEE 39节点系统测试的仿真结果表明,所构建的模型相较于其他方法具备更高的稳定性判别精度,且对失稳样本的识别率显著提高,验证了所提方法的有效性。

针织物的感温变色涂层整理及性能研究

为了使人体温度变化可视化,设计开发了智能温度监测变色织物。选择云母改性凉感涤纶长丝编织三种不同组织结构的针织物作为基布并对其进行感温变色涂层整理。采用2种不同变色温度及变色效果的可逆温敏变色粉末,与水性聚氨酯、增稠剂等按一定比例制成变色涂料,将其涂覆在织物表面得到不同温度范围的变色织物。分析水性聚氨酯质量分数、烘干温度及烘干时间对变色织物的色牢度、透气性等性能的影响,并探究不同组织结构对变色效果、响应速度等变色性能的影响。结果表明:面密度越大,织物的响应速度越慢,透气率略有下降;水性聚氨酯质量分数达到60%,烘干温度90℃,烘干时间7 min时,织物的色牢度最好;以凉感纬平针织物作为基底时,织物的变色性能及服用性能综合效果最佳。

彩色纤维数字化混色模型的构建与应用

针对彩色纤维混色过程中缺乏数字化推演手段等问题,以构建全色域网格化混色模型为目标,选取彩色三原色纤维与灰色纤维进行混色,以10%为梯度构建3组三元双重耦合混色模型;整合四基色节点与三元双重耦合混色网格点序号,得到全色域混色模型及其网格混色样的质量矩阵、混合比矩阵与颜色值矩阵;通过直角坐标与极坐标的转换,同时代入四基色彩色纤维颜色值,可得到矩形和圆形的全色域网格化混色模型及其色谱;依据构建的全色域混色模型,给出不同离散度的全色域网格化混色色谱及与之相对应的色相、明度、彩度的渐变色谱,并应用到服装面料色彩设计领域。研究表明,构建的全色域混色模型,不但可在全色域范围内获取彩色纤维的可视化混色色谱,还可为彩色纱线的数字化设计提供有效方法。

背包式激光雷达破损路面形变检测方法

为了高效监测道路破损现象,本文采用背包式三维激光扫描技术观测路面,并提出了一种破损路面形变检测方法。对于拉伸型破损,建立了基于色域均值的点云破损路面提取算法。首先构建二维格网进行破损初步提取。然后对点云的RGB色域进行加权均值计算,通过比值的差异化进行精细筛选,获取道路破损点云。对于挤压型破损,采用法向量夹角标准差法。使用欧式聚类,利用分类出的拉伸破损和挤压破损计算长度、宽度、破损间隔、高度。最后计算路面倾斜度,通过五维信息建立路面损伤综合评价模型。试验结果表明,拉伸型破损提取准确率达96.4%,挤压型破损提取准确率达100%;且路面损伤综合评价模型表明该条道路为三级破损,需要进行修复。本文方法基本满足道路破损提取所需精度,能为道路交通管制及修复措施制定提供技术支持。

A biooptical model of retrieving petroleum concentration in seawater

A biooptical modeling, which is based on a radiation transfer model, can be employed to simultaneously retrieve the concentration of various colour factors by multi-spectral remote sensing data, after connecting inherent optical properties （absorption coefficient and backward scattering coefficient） of colour factor with apparent optical properties （remote sensing reflectivity）. At present, this method has been used in a relatively wide range of applications in the inversion of a conventional water colour factor concentration in the case II water body： applications such as chlorophyll, suspended sediment, yellow substance. On the basis of extensive field testing data of water quality, correspondingly apparent optical properties, and the full use of the existing parametric model of colour factor inherent optical properties （with the parametrization of petroleum substance inherent optical properties established in the project） the remote recognition model for oil concentration is established by introducing oil as a new water co/our factor into a biooptical remote algorithm. The estimated value of the oil concentration was obtained by solving the biooptical model, using the data measured in May 2008 and August 2009 and June 2010 in seawater. The highly accurate inversion result promises to estimate the oil concentration in water for remote sensing.

Formation and instability of spiral wave induced by Gaussian coloured noise

In this paper, we studied the effect of Gaussian coloured noise on the formation and instability of spiral waves described by one class of modified FitzHugh Nagumo equation. It was found that Gaussian coloured noise plays a constructive role in the formation, transition and instability of spiral wave. Too weak or too strong noise may act against the formation of spiral waves. At a certain noise level, spiral wave is maintained in a medium, in which spiral wave cannot be observed in the absence of the noise. It is difficult to make a stable spiral wave into unstable state by Gaussian coloured noise, unless the noise level is very high. The parameter regions of Gaussian coloured noise for spiral forming and spiral instability were given and discussed with numerical simulations.

Spectral Models for Improving Atmospheric Correction Results in Complex Oceanic Waters around India

Atmospheric correction over turbid and productive waters continues to be problematic and often results in excessive errors in retrieved water-leaving radiance and bio-geo-physical products. This may be likely due to overestimation of La + Lra (atmospheric signal due to aerosol and Rayleigh scattering) in the visible and thus reduction in Lw which appears as an elevated pigment concentration. Spectral models for reconstructing the atmospherically distorted data are developed and their results are thoroughly validated with in-situ data from a wide range of waters. Good agreement was found between the retrieved products and in-situ data. Our results indicate that the new spectral models have the potential to improve the accuracy of ocean colour retrievals in optically complex waters, and can become an important part of the processing of data from ocean colour sensors (e.g., Ocean colour monitor OCM2) with only two near-infrared bands (i.e., 765 and 865 nm).

Control of high-order harmonic generation with two-colour laser field

We numerically investigate the high-order harmonic generation with two-colour optical field, taking into consideration the propagation effects. Some harmonics can be dramatically enhanced at a certain delay between the fundamental pulse and its second harmonics. Choice of the enhanced harmonics can be realised by changing the time delay between the two laser pulses.

从宋瓷应变思想谈中国现代陶艺发展诹议

唐宋变革之际,宋瓷在面对外来文化影响时以中国式理学为圭臬,创造出了独特的器物美学范式和文化,对中国现代陶艺的创新发展有一定的启示价值。一是“理一分殊”的理学思想形成与发展是宋瓷创新发展的理论基础;二是“无饰为饰”的造型哲学思想,是宋瓷造型形成独特审美标志的圭臬;三是“即物穷理”的釉色美学思想,是宋瓷釉色表现天地有大美而不言的轨范。目前,中国现代陶艺界已经认识到了由于缺失中国元素和文化自信带来的困扰,在很大程度上制约着中国现代陶艺的双创性发展。宋瓷在创新发展自身艺术形式的历程给予了我们诸多思考和借鉴。

低多边形风格游戏的色彩与模型设计研究

文章研究了低多边形风格游戏的色彩与模型设计。通过对市场上成功的低多边形风格的游戏进行分析,探究总结这些优秀的低多边形风格游戏在色彩和模型上的一些共性。将这一类游戏的色彩风格归纳为“极简主义色彩”,通过使用明亮、纯净的色彩来强化游戏场景的视觉冲击力和记忆性。同时,文章也研究了低多边形游戏的模型设计。我们发现这种游戏通常使用较少的多边形,但具有明确的轮廓线和纹理细节,并将这种设计风格归纳为“几何主义模型”,并提出了一种基于这种风格的模型设计方法,以实现简单但优美的游戏场景,并为游戏开发者提供了有价值的设计思路和指导。

Research on degradation mechanism of trichlorobenzene and Hg^(0) by nonthermal plasma catalysis

Aiming at mercury and dioxin in fire coal gas as research objects,nonthermal plasma(NTP)catalytic technology was used to investigate the degradation effect of operating condition parameters on mixed pollutants in mixed flue gas condition,and to explore the synergistic degradation of Hg0and TCB(1,2,3-trichlorobenzene,TCB)under mixed flue gas conditions.The research results showed that the conversion efficiency of mercury and TCB increased with the additional output of voltage,and decreased with the increase of the gas flow rate.Under optimal reaction conditions:voltage=17 k V,frequency=300 Hz,gas flow rate=21 min^(-1),the conversion efficiency of Hg^(0)and TCB reached the highest 91.4%and 84.98%,respectively.In the NTP catalytic system,active free radicals played an important role in the synergistic conversion of mercury and TCB,which have a competitive effect,to make the conversion efficiency of mixed pollutants lower than a single substance.In the mixed flue gas condition,the mixed gas has an inhibitory effect on the synergistic conversion of mercury and TCB.Kinetic modeling of NTP catalytic synergistic reaction was established.Under three conditions of TCB,mercury and TCB,mixed simulated flue gas,the NTP catalytic technology showed a quasi-firstorder kinetic reaction for the degradation of TCB.According to the synergistic effect of NTP and composites,the transformation and degradation of TCB mainly included two processes:TCB and ring opening,and Hg^(0)was finally oxidized to Hg^(2+).

项目化教学在中职时装画课程中的实践研究

服装绘画是表达服装设计理念的重要手段。以时装画技法课程为例,基于项目化教学的目的创设情境,分析实际产品从调研、开发到落地的系统性任务,探讨任务的落实方法,引导学生完成能够展现设计师的设计意图和构思的服装款式图和效果图的绘制,以帮助学生增强对岗位工作能力需求的了解,完善对工作任务流程的认知,提升绘画技法,促进学生养成积极地学习习惯,为学生的职业能力综合发展奠定坚实的基础。

计算机视觉木材表面色差检测的研究

针对木材表面色差的检测问题,提出一种新型的计算机视觉检测方法,即通过建立室内计算机视觉系统,获取木材表面的彩色图像,使用直方图和均方差的方法对色差进行检测。此方法能提高木材生产加工中色差分级的自动化水平和生产效率,提高木材利用率。

利用计算机视觉识别小麦叶色的光照模型研究

计算机图像识别技术的研究与应用是农业信息技术领域的重要分支之一。为更好的将其应用到虚拟作物中,用RGB系统表示叶色,利用虚拟现实技术中的光照技术,将太阳光分为环境光、漫射光和镜面光3部分,分别研究了这3部分光对叶色的影响,并根据颜色和太阳光的内在联系,建立了小麦叶片颜色的识别模型。检验表明,模型具有较高的准确性和较强的预测性。

基于SUSAN角点和HSV颜色模型的粒子滤波目标跟踪算法

针对传统粒子滤波目标跟踪算法在目标与背景颜色相似情况下目标定位偏差大、易导致丢失目标的缺陷,提出一种基于角点和颜色模型的粒子滤波目标跟踪算法。首先,提出一种改进SUSAN角点检测算法,采用圆形模板邻域内像素灰度值中值代替模板中心像素灰度值作为模板"核"来检测区域目标角点,其改进SUSAN角点算法在继承原有SUSAN算法计算简单、定位准确、具有旋转不变性等特点的同时,具有更好抗噪声性能;其次,利用HSV颜色模型光照不敏锐特性,对检测到的角点建立HSV颜色模型,并将其嵌入到粒子滤波框架中,实现对目标的跟踪。实验结果表明,当背景与目标颜色相近时,该算法能够有效避免背景对目标的干扰,取得了较好的目标跟踪性能。

卫星海洋水色遥感的辐射模式研究

海洋水体向上的辐射由水中多种成分的浓度所决定，同时辐射的强度十分微弱并随着时间和空间在变化。因此，海洋水色遥感需要从水体和大气辐射传递机理出发，研究到达卫星遥感器的辐射模式，以达到模拟仿真卫星水色遥感图像和卫星图像质量预测的目的。本研究通过叶绿素、悬浮泥沙和黄色物质等海洋水色的主要因子，分别从可见光波段和荧光波段对辐射的贡献出发，发展了海洋水体离水辐射率模式。在卫星水色遥感机理的基础上，同时运用Iqbal，Gordon和Sturm等的大气程辐射模式和太阳耀光模式，使卫星海洋水色遥感的辐射模式系统化，模拟仿真了我国1990年9月3日发射的FYIB卫星两个海洋水色通道的全轨道辐射图像，同时利用从德国柏林大学气象中心接收到的1990年9月23－25日卫星图像进行验证。结果认为，本文所发展的模式可应用于卫星图像质量的预测和水色信息的提取。

肤色与梯度互补的人脸检测研究

用YcbCr色彩空间中的Cr、Cb通道和HSV色彩空间中的H通道相结合,确定一种混合的肤色模型,即三维直方图模型。肤色在三维直方图中的聚类进行投影,结果为一个椭球,从而检测出可能的人脸区域。根据人脸的边缘形状,建立梯度模型定位人脸位置。利用两种模型的互补性,对算法进行线性组合,确定一个匹配度函数f(k)来衡量是否检测到目标人脸。实验结果表明该方法能够很好地排除人体其他部分裸露的肤色和背景中类肤色的干扰。其运算简单,检测速度快,对于侧面人脸和部分遮挡也有很好的效果。