一种仿生高距离分辨率估计器

蝙蝠所具有的回声定位系统可以使其在恶劣环境中准确地捕食猎物,其卓越的距离分辨能力为现有主动信息处理系统提升距离分辨力提供了可能的解决方案.基于此,从研究蝙蝠回声定位信号处理模型入手,对模型参数进行仿生化,并应用一种修正基函数,使其可以应用于水下主动信息处理系统高频段,以提升水下主动系统的距离分辨力.仿真结果表明,仿生处理可以很好地分辨混叠大的目标回波,提升了距离分辨力,且性能优于相关器.     

12CM15型连续采煤机截割齿轮箱内部结构缺陷及改造

在连续采煤机大修过程中,发现截割齿轮箱内部齿轮磨损严重,不能重复使用,经过分析发现,截割齿轮箱内部的齿轮轴及固定部分存在设计缺陷,使内部齿轮磨损严重,故对12CM15型连采机截割齿轮箱内部结构缺陷进行分析并提出改造方案。     

A virtual teleconferencing system based on face detection and 3D animation in a low‐bandwidth environment

In this article, we proposed a novel teleconferencing system that combines a facial muscle model and the techniques of face detection and facial feature extraction to synthesize a sequence of life‐like face animation. The proposed system can animate realistic 3D face images in a low‐bandwidth environment to support virtual videoconferencing. Based on the technique of feature extraction, a face detection algorithm for the virtual conferencing system is proposed in this article. In the proposed face detection algorithm, the YCbCr skin color model is used to detect the possible face area of the image; the feature points of the face is determined by using the symmetry property of the face and the gray level characteristics of the eyes and the mouth. According to the positions of the feature points on a facial image, we can compute the transformation values of the feature points. These values will then be sent via a network from the sender's side to the receiver's side frame by frame. We can synthesize the realistic facial animations on the receiver's side based on these. Experimental results show that the proposed system can achieve a practical animated face‐to‐face virtual conference with good facial expressions and a low‐bandwidth requirement. © 2010 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 20, 323–332, 2010     

Psoriasis image identification using k-means clustering with morphological processing

We present a preliminary design and experimental results of psoriasis objects tracking method for color-skin images that utilizes k-means clustering with morphological processing technique. The method is capable of solving unable exactly contoured psoriasis objects problem in color-skin image by adding the morphological reconstruction operation. The key idea of the proposed image processing procedure is the k-means clustering method helps the rough segmentation, then the dilation and erosion method are adapted to refine previous results. In this paper we investigate the possibility of employing this approach for psoriasis image application. The application of the proposed method for tracking psoriasis is demonstrated to help pathologists distinguish exactly its size and region. In this paper, we propose a psoriasis image segmentation procedure to improve the accuracy. The experimental results demonstrate that the misclassification error is very small between the proposed result and hand drawing.     

孔端面加工特种装置的设计与开发

为了使通用机床(摇臂钻床、镗床、铣床)实现刀具径向切削,满足加工内孔端面的工艺要求,开发了一种适用于通用机床与专用机床切削内孔端面的特种装置,并详细描述了装置的运动原理以及加工应用范围和特点。该装置结构合理、制造成本低、经济效益好、操作方便,不仅扩大了通用机床的加工范围,满足了中、小批量生产的需求,同时,该装置也适用于专用机床,满足大量生产的需求,在生产实际中效果良好。     

谈如何营造良好的商业街氛围

从大连西安路商业街的规划建设和实际使用状态出发,分析了目前该商业街存在的问题,主要从规划的角度,提出了营造良好商业氛围的方法,包括功能定位准确,空间界面人性化处理等,以指导商业街建设规划。     

A SfM-based 3D face reconstruction method robust to self-occlusion by using a shape conversion matrix

This paper presents a 3D face reconstruction method using multiple 2D face images. Structure from motion (SfM) methods, which have been widely used to reconstruct 3D faces, are vulnerable to point correspondence errors caused by self-occlusion. In order to solve this problem, we propose a shape conversion matrix (SCM) which estimates the ground-truth 2D facial feature points (FFPs) from the observed 2D FFPs corrupted by self-occlusion errors. To make the SCM, the training observed 2D FFPs and ground-truth 2D FFPs are collected by using 3D face scans. An observed shape model and a ground-truth shape model are then built to represent the observed 2D FFPs and the ground-truth 2D FFPs, respectively. Finally, the observed shape model parameter is converted to the ground truth shape model parameter via the SCM. By using the SCM, the true locations of the self-occluded FFPs are estimated exactly with simple matrix multiplications. As a result, SfM-based 3D face reconstruction methods combined with the proposed SCM become more robust against point correspondence errors caused by self-occlusion, and the computational cost is significantly reduced. In experiments, the reconstructed 3D facial shape is quantitatively compared with the 3D facial shape obtained from a 3D scanner, and the results show that SfM-based 3D face reconstruction methods with the proposed SCM show a higher accuracy and a faster processing time than SfM-based 3D face reconstruction methods without the SCM.     

平板波动量检具的研制

平板波动量是平板局部工作面平面度的判定依据之一。提出依据最小包容原则计算平板波动量并研制一种新型的测量工具,并进行不确定度和可行性分析。     

The role of scale resolution versus inter-particle cohesive forces in two-fluid modeling of bubbling fluidization of Geldart A particles

Coarse grid simulations of Geldart A particles in bubbling fluidized beds using standard two-fluid (TF) models, where the constitutive laws are based on the homogeneity of sub-grid scale structures, have been demonstrated to be unsuccessful due to the existence of significant sub-grid scale heterogeneous structures. However, a definite consensus on the fundamental origin of the failure is still lacking. Some claim that the existence of significant inter-particle cohesive forces results in the sub-grid scale heterogeneous structures which takes the form of agglomerates or clusters; others claim that the inter-particle cohesive forces are not the dominant factor, and that the poor performance of TF models is primarily due to the fact that the grid sizes and the time step used in previous studies are too coarse to fully resolve the bubbling structure. To this end, a short overview is firstly presented to discuss the role of scale resolution and inter-particle cohesive force in two-fluid modeling of Geldart A particles; We then qualitatively explain, using a state-of-the-art discrete particle method, why the methods based on the existence of aggregates or clusters work quite well, although the sub-grid scale structure is not properly identified, that is, the sub-grid scale structure takes the form of a bubble-emulsion phase.     

某超高层建筑抗震结构设计分析

通过工程实例,介绍超高层建筑的结构设计特点和结构性能目标,指出应注意的问题及相应措施,以供借鉴。