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Development of a new sealing-type abutment for improving contact state between the abutment and the fixture 为改善支承与夹具的接触状态,研制了一种新型密封式支承
Do-un Kim, Hyo-jeong Kang, Sang-wook Hwang, D. Hong, Hoon-ki Choi, Seung-young Lee
When repeating chewing force is applied to the dental implant, gap is often generated at the interface surface between the abutment and the fixture, and results in some deteriorations such as loosening of fastening screw, dental retraction and fixture fracture. To cope with such problems, this study focuses on the design of the interface surface shape of the abutment, and proposes a new sealing-type abutment so as to have a number of grooves along the conical-surface circumference. To show the effectiveness of the proposed method, a number of simulations are carried out by a finite element method in consideration of external chewing force and pretention between the abutment and the fixture. The simulation result shows that the proposed sealing-type abutment shows a better sealing effect than a conventional one.
当对种植牙施加重复咀嚼力时,基牙与固定架的界面表面往往会产生间隙,导致固定螺丝松动、牙回缩、固定架断裂等不良反应。针对这一问题,本研究重点设计了桥台的界面面形状,提出了一种新型的密封式桥台,沿锥形面周长有若干沟槽。为了证明所提方法的有效性,在考虑外咀嚼力和基台与夹具之间的固结作用的情况下,采用有限元方法进行了多次仿真。仿真结果表明,所提出的止水式桥台比常规桥台具有更好的止水效果。
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引用次数: 1
A Kinematic Analysis of Yan Mingyong's landing from Rings after the backward giant swing tuck of 2-circle back flip and a 360° turn 颜明勇2圈后空翻后大摆折后360度转身后环起落的运动学分析
Zou Ningxiang, Gong Mingxin, Wang Lejun, Wu Jiangbo
Objective: A study on the kinematic characteristics and Rings features of landing from Rings after the backward giant swing tuck of 2-circle back flip and a 360° turn aims to provide Chinese athletes with certain scientific theories and training practice. Methods: To get relevant kinematic data through the analysis of Yan Mingyong's performance in Rings Finals of 2011 National Gymnastics Championships. Results and Conclusions: The velocity of gravity centre increased as Yan's handstand started to swing down; The velocity of gravity centre of his body moved up swiftly as his legs threw up forwards while the whole body just passed through the vertical plane; Both hands left from the rings immediately at the point where the rising body resumed from the handstand; The landing angle was a bit larger as a result of a big step forward to make a stable landing; The landing skill needs to be improved.
目的:研究两圈后空翻360°转身后转身大摆曲后从圆环落地的运动学特征和圆环特征,旨在为我国运动员提供一定的科学理论和训练实践。方法:通过对2011年全国体操锦标赛吊环决赛中闫明勇的表现进行分析,得到相关的运动学数据。结果与结论:随着颜氏倒立开始向下摆动,重心速度增大;当他的整个身体刚刚穿过垂直平面时,他的腿向前翘起,身体重心的速度迅速上升;在身体从倒立恢复的地方,双手立即离开环;为了稳定着陆,向前迈了一大步,所以着陆角度变大了一点;落地技术有待提高。
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引用次数: 4
Study on multivariate forecast model of PingdingshanNO.10 mine gas content based on BP neural network 平顶山no多变量预测模型研究。10 .基于BP神经网络的矿井瓦斯含量
Hao Tianxuan, Shi Ling
The mathematic principles and numerical algorithm of BP neural network for gas contents were firstly studied, Then, the actual measurement data of gas contents during geological prospecting and mining of PingdingshanNO.10WU9-10 mine were collected, and 12 reliable dots were gained. By selecting 3 factors including depth, coal seam thickness and coal roof lithology as the input element, and the multivariate forecast models of gas contents based on BP neural network were respectively constructed. According to the calculation and evaluation of results, accuracy of the model to meet the requirements of engineering precision, indicated that BP neural network to predict mine e Pingdingshan 9–10 ten gas content of coal seam gas is feasible.
首先研究了含气量BP神经网络的数学原理和数值算法,然后给出了平顶山地质勘查开采含气量实测数据。采集了10WU9-10个地雷,获得了12个可靠点。选取深度、煤层厚度、煤层顶板岩性3个因素作为输入要素,分别构建了基于BP神经网络的含气量多元预测模型。根据计算和评价结果,该模型的精度满足工程精度要求,表明BP神经网络预测平顶山煤矿9-10 - 10煤层瓦斯含量是可行的。
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引用次数: 0
Researches on mining subsidence disaster management GIS's system 矿山沉陷灾害管理GIS系统研究
Chongchang Wang, Y. Lv, Yinguan Song
In order to manage the land serious damage caused by coal mining subsidence, this paper puts forward the idea of integration of coal and land information to manage mining subsidence disaster, designs the Mining Subsidence Disaster Management Information System Based on GIS, discusses the system achievement required GIS technology(Buffer analysis and Overlay analysis), subsidence prediction technology, land suitability assessment technology, etc. The developed system realizes mining subsidence prediction, housing damage prediction, land suitability assessment, etc. It provides strong technical means and data protection for leadership decision-making to guide production, as well as the solid foundation for the establishment of Digital Mine and Harmony Mine.
为了治理煤矿沉陷对土地造成的严重危害,提出了煤地信息一体化管理煤矿沉陷灾害的思路,设计了基于GIS的煤矿沉陷灾害管理信息系统,讨论了系统所需的GIS技术(缓冲区分析和覆盖分析)、沉陷预测技术、土地适宜性评价技术等。开发的系统实现了矿山沉陷预测、房屋破坏预测、土地适宜性评价等功能。为领导决策指导生产提供了强有力的技术手段和数据保障,为建设数字矿山、和谐矿山奠定了坚实的基础。
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引用次数: 3
Cover song identification using an enhanced chroma over a binary classifier based similarity measurement framework 使用增强色度的翻唱歌曲识别基于二分类器的相似度测量框架
Chuan Xiao
Identifying all covers/versions of a query song from music collection is a challenging task since there exists much variance of multiple aspects, such as timbre, tempo, key, structure, among covers. In this paper we propose a cover song identification algorithm, about which there are two innovations. The first, we propose a method for extracting an enhanced chromagram which retains the harmonic partials of music and holds invariance of volume; the second, based on aforementioned chromagram, a similarity measurement framework where any binary classifier can be applied is schemed. As a case, we apply Bayes classifier to the framework, and experiments indicate the proposed algorithm is able to provide competitive retrieval accuracy.
从音乐收集中识别查询歌曲的所有翻唱/版本是一项具有挑战性的任务,因为翻唱之间存在许多方面的差异,例如音色、速度、调式、结构。本文提出了一种翻唱歌曲识别算法,该算法有两个创新点。首先,我们提出了一种提取增强色谱图的方法,该方法既保留了音乐的和声分音,又保持了音量的不变性;其次,基于上述色谱图,设计了一个可以应用任何二值分类器的相似性度量框架。作为实例,我们将贝叶斯分类器应用于该框架,实验表明该算法能够提供有竞争力的检索精度。
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引用次数: 4
A trust model of web services based on individual experience 基于个人经验的web服务信任模型
Junlin Sun, Xu Yang
In Web services, the identical node may have different trust values in the different services domain because of the network complexity and the node's asymmetry. The node's individual difference is studied, and then one Web services trust model is proposed based on the individual experience by establishing quantitative and appraisal system. The Web services are divided into the different groups, and therefore the problem is solved that one node may have different reputation values in different services domain. The analysis indicates that the new model has improved the algorithm of feedback trust value very much.
在Web服务中,由于网络的复杂性和节点的不对称性,相同的节点在不同的服务域中可能具有不同的信任值。在研究节点个体差异的基础上,通过建立量化评价体系,提出了一种基于个体经验的Web服务信任模型。将Web服务划分为不同的组,从而解决了一个节点在不同服务域中可能具有不同声誉值的问题。分析表明,新模型对反馈信任值算法有很大的改进。
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引用次数: 1
Grading system of pear's appearance quality based on computer vision 基于计算机视觉的梨外观质量分级系统
Zhongzhi Han, Jing Liu, Yougang Zhao, Yanzhao Li
In order to realize the automatic grading system of pear's appearance quality based on computer vision, a grading system is constructed which includes hardware and software environment. It includes transport unit, control module, image acquisition module, and image processing and recognition module. It can realize automatic feature extraction. The features include shape, color and defect. According to the influence of spots on pear's surface on the defect detection, a spot removal method based on V component's dynamic threshold is put forward. According to the national standards, grading rules of fruit type and defect levels based on above features are constructed. Furthermore grading model of pear based on artificial neural network is also constructed. The recognition rate of 630 images of pear reaches up to 90.3%. The system, equipment and method in this paper have positive significance to on-line grading of pear's quality of appearance.
为了实现基于计算机视觉的梨外观质量自动分级系统,构建了一个包括硬件环境和软件环境的分级系统。它包括传输单元、控制模块、图像采集模块和图像处理与识别模块。可以实现特征的自动提取。特征包括形状、颜色和缺陷。针对梨表面斑点对缺陷检测的影响,提出了一种基于V分量动态阈值的斑点去除方法。根据国家标准,构建了基于上述特征的水果类型分级规则和缺陷等级。在此基础上,建立了基于人工神经网络的梨树分级模型。630张梨图像的识别率达到90.3%。该系统、设备和方法对梨外观质量在线分级具有积极意义。
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引用次数: 2
Ionospheric ionogram denoising based on Robust Principal Component Analysis 基于鲁棒主成分分析的电离层电离图去噪
S. Lang, Bo Zhao, Shun Wang, Xiaojun Liu, G. Fang
This paper proposes a preprocess optimization analysis called Robust Principal Component Analysis (RPCA) to eliminate the noises of ionospheric ionograms. Through the theoretical analysis of the basic principle and validity of this method and simulation results, we point out the feasibility of this method and give a useful algorithm named accelerated proximal gradient method (APGp) to solve this RPCA problem. Finally, we verify the feasibility of this method by some simulation results.
为了消除电离层电离层图噪声,提出了一种鲁棒主成分分析(RPCA)预处理优化分析方法。通过对该方法的基本原理、有效性和仿真结果的理论分析,指出了该方法的可行性,并给出了一种求解该RPCA问题的实用算法——加速近端梯度法(APGp)。最后,通过仿真结果验证了该方法的可行性。
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引用次数: 4
Compressed sensing image processing based on nonsubsampled contourlet transform 基于非下采样contourlet变换的压缩感知图像处理
Fu Liu, Caiyun Huang
A compressed sensing algorithm based on nonsubsampled contourlet transform (NSCT) is proposed, NSCT can provide better sparsity than wavelet transform does in image transform. low-frequency coefficients of the image are preserved, only high-frequency coefficients are measured. In the reconstruction, OMP algorithm is used to recover high-frequency coefficients and the image is reconstructed by inverse nonsubsampled contourlet transform. Compared with wavelet compressed sensing algorithms, simulation results demonstrate that the quality of reconstructed image can be greatly improved under the same measurement number.
提出了一种基于非下采样轮廓波变换(NSCT)的压缩感知算法,NSCT在图像变换中具有比小波变换更好的稀疏性。保留图像的低频系数,只测量高频系数。在重建过程中,采用OMP算法恢复高频系数,并采用非下采样contourlet逆变换重建图像。仿真结果表明,与小波压缩感知算法相比,在相同的测量次数下,重构图像的质量有很大提高。
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引用次数: 2
Time-lapse seismic attributions clustering analysis 时移地震属性聚类分析
Liu Qicheng, Zheng Wenjing, Tong Xiangrong, Song Yibin, Zhang Wei
Time-lapse attribution clustering analysis technology is studied. By analyzing many kinds of time-lapse seismic attribution and the geologic condition, the clustering analysis is done using the time-lapse seismic attribution with small correlative coefficient in the attribution relation graphics and the matrix distributing graphics, to determine the relationship between the time-lapse seismic attribution and the reservoir characteristic parameter. A practical clustering analysis class that is developed using object-oriented technology is introduced. It can complete the fundamental operation dynamic clustering analysis programming with little information. This paper also proposes the idea of adopting data parallelism when designing a parallel clustering algorithm. The clustering analysis technology and parallel clustering algorithm studied in this paper can also be used to design a network information propagation monitoring system combined with Chinese information processing and to achieve text cluster and theme discovery.
研究了延时归因聚类分析技术。通过对多种时移地震属性和地质条件的分析,利用属性关系图和矩阵分布图中相关系数较小的时移地震属性进行聚类分析,确定时移地震属性与储层特征参数之间的关系。介绍了利用面向对象技术开发的一个实用的聚类分析类。它可以在极少信息的情况下完成基本操作的动态聚类分析规划。本文还提出了在设计并行聚类算法时采用数据并行性的思想。本文所研究的聚类分析技术和并行聚类算法也可以用来设计一个结合中文信息处理的网络信息传播监测系统,实现文本聚类和主题发现。
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IEEE International Conference on Systems Biology : [proceedings]. IEEE International Conference on Systems Biology
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