TSINGHUA SCIENCE AND TECHNOLOGY

ISSN 1007ª²0214 CN 11ª²3745/N ª¤ Vol.8, No.5, October 2003

CONTENTS

MATHEMATICSªª

1. Bounds of Spectral Radii of Weighted Trees YANG Huazhong, HU Guanzhang, ª¥HONG Yuan 517-520

2. Domain Decomposition Method for the Forwardª²Backward ª¥Heat Equation HAN Houde, YIN Dongsheng 521-525

3. Artificial Boundary Method for Calculating Ship Wave ª¥Resistance WEN Xin, HAN Houde 526-532

4. Periodic Eigenvalues of Oneª²Dimensional pLaplacian with Indefinite Weights YAN Ping, ZHANG Meirong 533-536

5. R/Sª« Analysis of China Securities Markets HUA Su£¬ LIN Yong 537-540

6. Dirichlet Form of Product of Variational Fractals LIU Yuan 541-546

7. Finite Dimensional Integrable Systems Related to Generalized ª¥Schrodinger Equations SHI Qiyan 547-552

8. Bounds for Certain Character Sums YANG Jin£¬ ZHENG Zhiyong 553-556

9. Some Properties of Fractals Generated by Linear Cellular ª¥Automata NI Tianjia 557-563

10. Optimization of Permeability Tensor Characteristics of Anisotropic ª¥Reservoir and Well Pattern Parameters JI Bingyu, LAN Yubo 564-567

11. Association of SIB Points with the Nonª²Degenerate Equilibria ª¥of the Extended DAE System K. H. Yasir, DU Dongyun, ª¥TANG Yun 568-572

12. Observable Algebra in Field Algebra of G spin Models JIANG Lining 573-576

MECHANICAL ENGINEERINGªª

13. Active Noise Control for Vehicle Exhaust Noise Reduction LI Keqiang, YANG Diange, ª¥ZHENG Sifa, et al 577-581

14. Nonlinear Analyses of the Dynamic Properties of Hydrostatic ª¥Bearing Systems LIU Wei, WU Xiujiang£¬ ª¥V.A.Prokopenko 582-585

15. Design Optimization of Charger Based on PSPICE Simulation CAI Chenghui, DU Dong, ª¥GE Jingtian, et al 586-592

16. Shakedown Analysis of 3ª²D Structures Using the Boundary ª¥Element Method Based on the Static Theorem ZHANG Xiaofeng, CHEN Gang£¬ª¥LIU Yinghua, et al 593-597

17. Experimental Study of High Moisture Content Gas Flow Across ª¥a Cylinder at Moderate Reynolds Numbers D. M. Christopher, GUO Liang 598-604

INFORMATION SCIENCE AND TECHNOLOGYªª

18. Chaosª²Based Encryption Algorithm for Compressed Video YUAN Chun, ZHONG Yuzhuo, ª¥HE Yuwen 605-611

19. Computer Aided Design System for Developing Musical ª¥Fountain Programs LIU Dan, ZHANG Naiyao, ª¥ZHU Hancheng 612-616

20. Biª²Spectrum Scattering Model for Dielectric Randomly Rough ª¥Surface LIU Ning£¬ LI Zongqian 617-623

21. Correction of Scanned Book Images ZHONG Xiaogang, LI Xinyou, ª¥TANG Zesheng 624-627

22. Fast VLSI Implementation of Modular Inversion in Galois ª¥Field GF(ª«pª«) ZHOU Tao, WU Xingjun, ª¥BAI Guoqiang, et al 628-632

ECONOMICS AND MANAGEMENTªª

23. Analysis of a New Type of Production System GONG Qiguo£¬ WANG Yongxian£¬ ª¥ZHAO Xiaobo, et al 633-640 ª¦