Multi-Modal Domain Adaptation Variational Autoencoder for EEG-Based Emotion Recognition

Traditional electroencephalograph (EEG)-based emotion recognition requires a large number of calibration samples to build a model for a specific subject, which restricts the application of the affective brain computer interface (BCI) in practice. We attempt to use the multi-modal data from the past session to realize emotion recognition in the case of a small amount of calibration samples. To solve this problem, we propose a multi-modal domain adaptive variational autoencoder (MMDA-VAE) method, which learns shared cross-domain latent representations of the multi-modal data. Our method builds a multi-modal variational autoencoder (MVAE) to project the data of multiple modalities into a common space. Through adversarial learning and cycle-consistency regularization, our method can reduce the distribution difference of each domain on the shared latent representation layer and realize the transfer of knowledge. Extensive experiments are conducted on two public datasets, SEED and SEED-IV, and the results show the superiority of our proposed method. Our work can effectively improve the performance of emotion recognition with a small amount of labelled multi-modal data.      

弹引系统动态特性有限元分析

提出一种基于有限元分析的弹引系统动态特性计算方法.采用预紧单元对弹体和引信的耦合部位进行网格划分,对不同拧紧力时弹引系统的动态特性进行模拟.在相同的激励环境下,对某弹引系统进行了有限元数值计算和实测锤击试验,试验结果表明,所采用的有限元分析方法精度较高.     

结构小修改条件下的一种自振频率计算法

本文利用Ｒａｙｌｅｉｇｎ法预测结构再设计后的动态特征的变动情况,采用多方案比较法确定了满足设计要求的最佳方案,并利用模态实验法对该理论和所研制的软件进行了验证。结果表明：该方法具有节省时间和费用的突出特点,特别适用于目前国内产品的改进和开发,具有广泛的工程实用价值。     

望远镜主转动框架设计分析方法

利用有限元方法，完成对望远镜主转动框架的结构静力分析和模态分析。并利用有限元中建立刚性区和坐标变换等方法进行了简化模型。阐述了基于有限元分析的结构模型的建立及简化处理过程，利用ANSYS软件完成了静力及模态分析计算，通过分析的结果为工程实际提供参考和建议，为主转动框架的分析提供了一种新的思路。     

高层建筑底部空间的城市化设计倾向探析

一个成功的高层建筑底部空间，不仅是建筑与城市良好的过渡，本身也是城市公共空间的一个有益的组成部分。本文旨在通过对高层建筑底部城市化空间一般形态、交通组织、环境文脉关系、功能空间等诸要素的综合分析，为如何将高层与城市有机融合，创造一个有魅力的，有活力的城市空间进行研究探讨。     

《建筑初步》课程改革初探

《建筑初步》课程近年来一直是建筑类专业改革热点。为了提高学生的创造性思维能力,使设计启蒙教学与专业设计能良好衔接,文章结合作者多年的教学经验,提出对此课程改革的一些初步设想。     

城市创新空间理论与空间形态结构研究

提出城市创新空间理论,对概念、基本类型进行了诠释,阐述其理论框架的构成,强调创新机制和创新文化等软要素在空间系统中的重要作用;同时,按尺度总结其具体空间层级的划分,概括其从区域整合到实体空间建构的多层级发展模式;最后讨论其结构形态,指出其空间布局所呈现出的巨构化、田园化和多元共构等特征和倾向。     

Flutter control effect and mechanism of central-slotting for long-span bridges

The flutter control effect and mechanism of central-slotting, which have gradually been adopted in the design and construction of long-span bridges as an effective flutter controlling measure, were investigated with theoretical analysis and wind tunnel test. Five basic girder cross-sections representing five typical aerodynamic configurations were selected and central-slotted with two different slot widths. Then, a series of sectional model tests and theoretical analyses based on the two-dimensional three-degrees-of-freedom coupling flutter analysis method (2 dimension-3 degrees of freedom method, 2d-3DOF method) were carried out to investigate the aerody namic performance, flutter mechanism and flutter modality of the five basic sections and their corresponding central-slotted sections. The results show that central-slotting can not always improve the aerodynamic stability of bridge structure. The control effect of central-slotting depends on the aerodynamic configuration of the original girder section and the corresponding central-slotting width. If the original section is inappropriate or the slot width is unsuitable, central-slotting will even deteriorate the structural flutter performance. Theoretical investigations indicated that the differences in flutter control effects come from the different formation and evolution of aerodynamic damping, and flutter modality especially the participation level of heaving motion also has a significant influence on the control effect of central-slotting. __________ Translated from China Civil Engineering Journal, 2006, 39(7): 74–80 [译自: 土木工程学报]     

应用于高频数字化LLC谐振变换器的变模态调制策略

以数字化LLC谐振变换器为研究对象,针对其达到1MHz应用时出现的频率分辨率不足及其导致的输出电压脉动问题,提出了一种抑制该问题的变模态调制策略。该策略包含两个模态：传统的仅调节频率的频率调制模态和频率及占空比同时调节的复合调制模态。在复合调制模态下,当检测到开关频率以最小频率间隔来回跳动时,锁定开关频率并通过调节占空比以实现对变换器电压增益的精细调节,从而抑制单一频率调制下出现的输出电压脉动问题。文中给出了该策略的工作原理分析、设计要点分析,并在一台1 MHz的样机上完成了对比实验,实验结果验证了所提出变模态策略的有效性。