虚拟现实中多刚体人体模型的构建     

朱雄军 《武汉职业技术学院学报》2005,4(1):60-62

本文概述了人体Hanavan模型，运用面向对象的技术设计了骨骼类和关节类，实现了多刚体三维人体模型的构建，为模拟三维人体运动打下了基础。  相似文献   

支持向量分类算法在5-HT3受体拮抗剂的构效关系研究中的应用     

杨善升  陆文聪  纪晓波  陈念贻 《上海大学学报(英文版)》2006,10(4):366-370

In this work, support vector classification （SVC） algorithm was used to build structure-activity relationship （SAR） model of the 5-hydroxytryptamine type 3 （5-HT3 ） receptor antagonists with 26 compounds. In a benchmark test, SVC was compared with several techniques of machine learning currently used in the field. The prediction performance of the model was discussed on the basis of the leave-one-out cross-validation. The results show that the accuracy of prediction of SVC model was higher than those of back propagation artificial neural network （BP ANN）, K-nearest neighbor （KNN） and Fisher methods.  相似文献   

Too Much,Too Young? An Analysis of the Key Stage 3 National Literacy Strategy in Practice   总被引：1，自引：0，他引：1  

Neil Allen 《English in Education》2002,36(1):5-15

This article was first drafted after I worked for 14 weeks last year in a school that was piloting the National Literacy Strategy at Key Stage 3. I now work in another school delivering the full published Strategy to Year 7. In this article, I explore the contradictions inherent in the Strategy in attempting to develop the English and literacy skills of Key Stage 3 pupils. Ultimately, my argument is that the educational benefits of this teaching to objectives is at odds with some of the deeper aims of the Strategy and of English teaching, and that the constant assessment involved puts too much pressure on our youngsters at an age when they should be concentrating on social development as people.  相似文献   

通过串音预测对PCB布线的3W规则进行验证     

莫付江 《天中学刊》2003,18(2):30-33

在传输线理论的基础上，利用有限元(FEM)法计算分层介质中微带线上场的分布，并通过SPICE仿真对其等效电路在不同频率电源激励下产生的串音进行预测．预测结果验证了印制电路板布线遵从“3W”规则的重要性．由此得出结论：3W规则的使用有功于PCB设计满足EMC系统设计标准，并最大限度地减小印制线之间的耦合．  相似文献   

Pattern design on 3D triangular garment surfaces     

WANG Jin LU Guo-dong LI Ji-tuo CHEN Long ZHANG Dong-liang 《浙江大学学报(A卷英文版)》2007,8(10):1642-1649

This paper focuses on a pattern design method for a 3D triangular garment surface. Firstly, some definitions of 3D style lines are proposed for designing the boundaries of patterns as drawing straight lines or splines on the triangular surface. Additionally some commonly used style lines are automatically generated to enhance design efficiency. Secondly, after style lines are preprocessed, a searching method is presented for quickly obtaining the boundaries and patches of a pattern on the 3D trian- gular surface. Finally a new pattern design reuse method is introduced by encoding/decoding the style line information. After style lines are encoded, the pattern design information can be saved in a pattern template and when decoding this template on a new garment surface, it automates the pattern generation for made-to-measure apparel products.  相似文献   

Numerical Calculation of Concrete Slab Response to Blast Loading     

ZHOU Xiaoqing HAO Hong KUZNETSOV Valerian A WASCHL John 《天津大学学报(英文版)》2006,12(B09):94-99

In the present paper, a dynamic plastic damage model for concrete has been employed to estimate responses of a reinforced concrete slab subjected to blast loading. The interaction between the blast wave and the concrete slab is considered in 3D simulation. In the first stage, the initial detonation and blast wave propagation is modelled in 2D simulation before the blast wave reaches the concrete slab, then the results obtained from 2D calculation are remapped to a 3D model. The calculated blast load is compared with that obtained from TM5-1300. Numerical results of the concrete slab response are compared with the explosive test carried out-in the Weapons System Division, Defence Science and Technology Organisation, Department of Defence, Australia.  相似文献   

计算机图形图像技术在医学中的应用   总被引：1，自引：0，他引：1  

冯毅  孔冬莲 《鄂州大学学报》2007,14(2):13-16

该文通过医学应用和研究领域几个有代表性的例子引入了计算机图形图像相关技术在医学中的应用,同时简单介绍了这些相关技术的概念、意义和发展。  相似文献   

SrTiO_3微晶玻璃的低温制备及性能     

朱津裘 《中山大学学报论丛》1992,(2)

采用低温法制备出SrTiO_8微晶玻璃.对样品进行了X-射线和DTA及ε-T曲线的测定。结果表明,在样品用料中加入一定量的碱金属氧化物,可以在较低温度下(～1350℃)制得SrTIO_8微晶玻璃。碱金属加入量的多少直接影响到微晶玻璃的制成温度.在较低温度下制得的微晶玻璃的介电常数随SrTiO_3含量的增加而增加,随温度的升高而略有升高。  相似文献   

钢琴四、五度与三、六度调律法     

张迪华 《衡阳师范学院学报》2005,26(4):168-170

钢琴调律，精确度是不容忽视的问题。目前，调律师普遍采用的是四、五度调律法。但这种调律法的整个过程彼此依赖，形成一个闭合环，二旦某个步骤出现误差，将会带入下一环节，而三、六度调律法可减少人为误差，有助于提高调律的速度及精确度。  相似文献   

Research on Gelcasting Formation of SiC-Al_2O_3-Y_2O_3-La_2O_3 Systems     

郭文利  徐廷献  靳正国 《天津大学学报(英文版)》2003,9(3)

Siliconcarbide (SiC)ceramicmaterialsareusefulad vancedmaterialsinmanyfields,suchasmedicalbiomateri als ,hightemperaturesemiconductors ,synchrotronopticalel ementsandhighstrength /lightweightstructuralmaterials[1] .However,theactualapplicationisstilllimitedduetoitslowreliability ,highmachiningcosts[2 ] .Gelcastingprovidesane conomicalandfeasiblenet shape forminghomogeneousandflawlessgreenbodieswithcomplexgreenshapes.　　Gelcastingconsistsofin situpolymerizationthroughwhichamacromolecularnetwor…  相似文献