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产氢活性 1

介观动力学模型 1

催化剂描述符 1

动态输出反馈 1

基于内容的卫星图像配准；特征点分布；图像配准；线性判别准则；遥感；尺度不变特征变换 1

模糊广义系统 1

目标检测；梯度直方图；稠密度SIFT；显著性检测；组件模型；工程车辆 1

碳表面化学 1

线性矩阵不等式 1

铂电荷数 1

面部特征定位；几何特征；外貌特征；笑容识别 1

鸡尾酒会问题；计算听觉场景分析；非负矩阵分解；排列不变性训练；多说话人语音处理 1

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An invariant descriptor for conjugate forced convection-conduction cooling of 3D protruding heaters in

Thiago ANTONINI ALVES,Paulo H. D. SANTOS,Murilo A. BARBUR

《机械工程前沿（英文）》 2015年 第10卷 第3期   页码 263-276 doi: 10.1007/s11465-015-0345-y

摘要：

In this research, the temperatures of three-dimensional (3D) protruding heaters mounted on a conductive substrate in a horizontal rectangular channel with laminar airflow are related to the independent power dissipation in each heater by using a matrix G+ with invariant coefficients, which are dimensionless. These coefficients are defined in this study as the conjugate influence coefficients (g+) caused by the forced convection-conduction nature of the heaters’ cooling process. The temperature increase of each heater in the channel is quantified to clearly identify the contributions attributed to the self-heating and power dissipation in the other heaters (both upstream and downstream). The conjugate coefficients are invariant with the heat generation rate in the array of heaters when assuming a defined geometry, invariable fluid and flow rate, and constant substrate and heater conductivities. The results are numerically obtained by considering three 3D protruding heaters on a two-dimensional (2D) array by ANSYS/FluentTM 15.0 software. The conservation equations are solved by a coupled procedure within a single calculation domain comprising of solid and fluid regions and by considering a steady state laminar airflow with constant properties. Some examples are shown, indicating the effects of substrate thermal conductivity and Reynolds number on conjugate influence coefficients.

关键词： channel flow     conjugate forced convection-conduction cooling     conjugate influence coefficients     discrete heating     invariant descriptor     thermal management    

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View-invariant human action recognition via robust locally adaptive multi-view learning

Jia-geng FENG,Jun XIAO

《信息与电子工程前沿（英文）》 2015年 第16卷 第11期   页码 917-920 doi: 10.1631/FITEE.1500080

摘要： Human action recognition is currently one of the most active research areas in computer vision. It has been widely used in many applications, such as intelligent surveillance, perceptual interface, and content-based video retrieval. However, some extrinsic factors are barriers for the development of action recognition; e.g., human actions may be observed from arbitrary camera viewpoints in realistic scene. Thus, view-invariant analysis becomes important for action recognition algorithms, and a number of researchers have paid much attention to this issue. In this paper, we present a multi-view learning approach to recognize human actions from different views. As most existing multi-view learning algorithms often suffer from the problem of lacking data adaptiveness in the nearest neighborhood graph construction procedure, a robust locally adaptive multi-view learning algorithm based on learning multiple local L1-graphs is proposed. Moreover, an efficient iterative optimization method is proposed to solve the proposed objective function. Experiments on three public view-invariant action recognition datasets, i.e., ViHASi, IXMAS, and WVU, demonstrate data adaptiveness, effectiveness, and efficiency of our algorithm. More importantly, when the feature dimension is correctly selected (i.e.,>60), the proposed algorithm stably outperforms state-of-the-art counterparts and obtains about 6% improvement in recognition accuracy on the three datasets.

关键词： View-invariant     Action recognition     Multi-view learning     L1-norm     Local learning    

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Contact of surfaces and contact characteristics of offset surfaces

CAO Lixin, GONG Hu, LIU Jian

《机械工程前沿（英文）》 2008年 第3卷 第3期   页码 318-324 doi: 10.1007/s11465-008-0067-5

摘要： Based on differential geometry, the contact problems of two surfaces are discussed in this paper. The relationship between the contact status of two surfaces and that of offset surfaces are also analyzed. For a 5-axis NC machining, some research such as optimization of cutter location and calculation of the geometrical cusp height are important. The research results indicate that the relative normal curvature is an important geometrical invariant for describing the contact state of two surfaces. For point contact two surfaces, the calculation equation for the second order remained error is given. For line contact two surfaces, the condition of the second order line contact is that the principal directions and curvatures of the two surfaces are the same along the contact curve. If two surfaces keep the second order line contact, their two offset surfaces will also keep the second order line contact, and their third order remained errors are also uniform with that of the two offset surfaces.

关键词： relative     important geometrical     relationship     geometrical invariant     calculation    

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一种快速均匀的采用尺度不变特征变换描述符进行基于内容的卫星图像配准方法 Article

Hamed BOZORGI, Ali JAFARI

《信息与电子工程前沿（英文）》 2017年 第18卷 第8期   页码 1108-1116 doi: 10.1631/FITEE.1500295

摘要： 尺度不变特征变换（scale-invariant feature transform, SIFT）算法是一种成功应用于卫星图像配准的算法。本地SIFT描述符被许多研究者应用于改进图像检索流程。

关键词： 基于内容的卫星图像配准；特征点分布；图像配准；线性判别准则；遥感；尺度不变特征变换    

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Design of bio-oil additives via molecular signature descriptors using a multi-stage computer-aided molecular design framework

《化学科学与工程前沿（英文）》 2022年 第16卷 第2期   页码 168-182 doi: 10.1007/s11705-021-2056-8

摘要： Direct application of bio-oil from fast pyrolysis as a fuel has remained a challenge due to its undesirable attributes such as low heating value, high viscosity, high corrosiveness and storage instability. Solvent addition is a simple method for circumventing these disadvantages to allow further processing and storage. In this work, computer-aided molecular design tools were developed to design optimal solvents to upgrade bio-oil whilst having low environmental impact. Firstly, target solvent requirements were translated into measurable physical properties. As different property prediction models consist different levels of structural information, molecular signature descriptor was used as a common platform to formulate the design problem. Because of the differences in the required structural information of different property prediction models, signatures of different heights were needed in formulating the design problem. Due to the combinatorial nature of higher-order signatures, the complexity of a computer-aided molecular design problem increases with the height of signatures. Thus, a multi-stage framework was developed by developing consistency rules that restrict the number of higher-order signatures. Finally, phase stability analysis was conducted to evaluate the stability of the solvent-oil blend. As a result, optimal solvents that improve the solvent-oil blend properties while displaying low environmental impact were identified.

关键词： computer-aided molecular design     bio-oil additives     molecular signature descriptor    

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具有极点区域约束的广义模糊系统的输出反馈控制

高丹,曹媛媛

《中国工程科学》 2006年 第8卷 第4期   页码 63-67

摘要：

针对模糊广义系统，将动态输出反馈控制器设计问题转化为一组矩阵不等式的可行解问题，使得闭环系统不仅具有鲁棒性能，而且能把闭环系统极点配置在一个给定的圆形区域内，从而保证系统具有期望的动态性能。

关键词： 模糊广义系统     动态输出反馈     线性矩阵不等式    

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基于特定区域纹理描述和面部动态变化的自发性微笑判别技术 Article

Ping-ping WU, Hong LIU, Xue-wu ZHANG, Yuan GAO

《信息与电子工程前沿（英文）》 2017年 第18卷 第7期   页码 955-967 doi: 10.1631/FITEE.1600041

摘要： 微笑作为一种典型的生物多样性特征信号，在社会交往中有较大影响力，它揭示了人的情感感受和内心状态。自发性的微笑与假笑由不同大脑系统发出，在形态学和动力学上均存在差异。区分这两种类型的微笑仍具有挑战性，因为其中细微差别很难被肉眼观察到，仍有待被识别捕捉。已有相关研究大多是提取自发性微笑的几何特征，而外观特征并没有被充分利用，导致纹理信息的丢失。本文提出一种基于特定区域纹理描述来表示不同面部区域的局部模式变化，从而弥补几何特征研究的局限性。每个面部区域的时间相位是通过计算相应的面部区域强度来划分，而非仅考虑嘴巴区域强度。同时利用支持向量机的中层融合策略，将两种特征类型结合起来。实验结果表明，本文提出的外观表示法及其与基于几何形状的人脸动力学的结合技术，在BBC、SPOS、MMI和UvA-NEMO四个基准数据库中得到很好的应用。

关键词： 面部特征定位；几何特征；外貌特征；笑容识别    

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鸡尾酒会问题的技术回顾、当前进展及未来挑战 Review

Yan-min QIAN, Chao WENG, Xuan-kai CHANG, Shuai WANG, Dong YU

《信息与电子工程前沿（英文）》 2018年 第19卷 第1期   页码 40-63 doi: 10.1631/FITEE.1700814

摘要： 一些基于深度学习的最新技术，如深度聚类（deep clustering, DPCL）、深度吸引网络（deep attractor network, DANet）以及排列不变性训练（permutation invariant

关键词： 鸡尾酒会问题；计算听觉场景分析；非负矩阵分解；排列不变性训练；多说话人语音处理    

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Pt/C催化剂电子结构调控产氢介观动力学研究 Article

陈文尧, 傅文钊, 段学志, 陈炳旭, 钱刚, 司锐, 周兴贵, 袁渭康, 陈德

《工程（英文）》 2022年 第14卷 第7期   页码 124-133 doi: 10.1016/j.eng.2020.11.014

摘要：

通过调控金属-载体界面间的电子传递提高催化性能已被证明是一种有效且具有挑战性的催化研究策略。本文提出了一种调变铂/碳纳米复合物催化剂中碳载体表面化学性质（载体表面吸电子/给电子含氧官能团），用以精细调控负载金属铂电子性质及其催化性能的方法。本文以氨硼烷水解制氢作为模型反应，结合密度泛函理论（DFT）计算、先进表征技术、动力学及同位素研究，定量关联了载体表面化学性质、铂电荷数与电子结合能、活化熵与活化焓，以及催化活性之间的关系。通过解耦碳载体表面复杂的影响因素，提出铂电荷数可作为实验易测量的催化活性描述符，其中通过铂电荷数的调变可使催化性能提升15倍。在此基础上，首次建立了包含催化剂活性描述符与活性位数量的介观动力学模型，可分别定量催化剂电子与几何效应，并预测催化性能的变化。本文提出的介观动力学模型可进一步用于设计与构筑高效的金属/碳催化剂。

关键词： 介观动力学模型     催化剂描述符     铂电荷数     碳表面化学     产氢活性    

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基于高清监控图像的工程车辆检测算法

Xun Liu, Yin Zhang, San-yuan Zhang, Ying Wang, Zhong-yan Liang, Xiu-zi Ye,star.liuxun@gmail.com,yinzh@zju.edu.cn,syzhang@zju.edu.cn,maggiewang0427@gmail.com

《信息与电子工程前沿（英文）》 2015年 第16卷 第5期   页码 346-357 doi: 10.1631/FITEE.1500026

摘要： 目的：基于监控图像，设计一种工程车辆检测算法，使其能快速高效地对工程车辆等组件可变铰链式刚体进行识别与检测。 创新点：模拟人类视觉检测过程，把检测算法分为粗提取与精确分类两个阶段。第一阶段提出“颜色频率”特征并用其优化HOG描述子。第二阶段改进一种显著性提取算法并用改进的算法来改善dense SIFT算子。两阶段结合，得到整体高效的检测算法。 方法：监控图像的特点是高空广角监控，工程车辆像素面积小，模拟人类视觉从复杂多样的物体中检测目标物体的过程，把检测过程分为粗提取阶段与精确分类阶段。人类在寻找目标物体时，一般会快速浏览这些复杂多样的物体群，遇到拟似目标物体，会多停留几秒来确认是否为真正的目标物体。粗提取阶段，加入“颜色频率”的HOG描述子(图3)和线性SVM分类器，快速扫描整张监控图像，从中提取出拟似工程车辆区域。这一阶段的目的是低漏检率快速提取拟似目标区域。精确分类阶段是采用显著性蒙版化的dense SIFT算子(图8)，去除第一阶段提取出的非工程车辆区域，得到最终的低漏检率低错检率的快速检测算法(图1)。 结论：针对监控图像的工程车辆等组件可变的铰链式刚体，提出一种先大范围粗提取后小范围精确分类的检测算法。算法不仅高效快速，且具有一定泛化性能。

关键词： 目标检测；梯度直方图；稠密度SIFT；显著性检测；组件模型；工程车辆    

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标题 作者 时间 类型 操作

An invariant descriptor for conjugate forced convection-conduction cooling of 3D protruding heaters in

Thiago ANTONINI ALVES,Paulo H. D. SANTOS,Murilo A. BARBUR

期刊论文

View-invariant human action recognition via robust locally adaptive multi-view learning

Jia-geng FENG,Jun XIAO

期刊论文

Contact of surfaces and contact characteristics of offset surfaces

CAO Lixin, GONG Hu, LIU Jian

期刊论文

一种快速均匀的采用尺度不变特征变换描述符进行基于内容的卫星图像配准方法

Hamed BOZORGI, Ali JAFARI

期刊论文

Design of bio-oil additives via molecular signature descriptors using a multi-stage computer-aided molecular design framework

期刊论文

具有极点区域约束的广义模糊系统的输出反馈控制

高丹,曹媛媛

期刊论文

基于特定区域纹理描述和面部动态变化的自发性微笑判别技术

Ping-ping WU, Hong LIU, Xue-wu ZHANG, Yuan GAO

期刊论文

鸡尾酒会问题的技术回顾、当前进展及未来挑战

Yan-min QIAN, Chao WENG, Xuan-kai CHANG, Shuai WANG, Dong YU

期刊论文

Pt/C催化剂电子结构调控产氢介观动力学研究

陈文尧, 傅文钊, 段学志, 陈炳旭, 钱刚, 司锐, 周兴贵, 袁渭康, 陈德

期刊论文

基于高清监控图像的工程车辆检测算法

Xun Liu, Yin Zhang, San-yuan Zhang, Ying Wang, Zhong-yan Liang, Xiu-zi Ye,star.liuxun@gmail.com,yinzh@zju.edu.cn,syzhang@zju.edu.cn,maggiewang0427@gmail.com

期刊论文