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| 1 | SIMULTANEOUS SHAPE AND TOPOLOGY OPTIMIZATION OF TRUSS UNDER LOCAL AND GLOBAL STABILITY CONSTRAINTS显示文摘A new approach for the solution of truss shape and topology optimization problem sunder local and global stability constraints is proposed. By employing the cross sectional areas of each bar and some shape parameters as topology design variables, the difficulty arising from the jumping of buckling length phenomenon can be easily overcome without the necessity of introducing the overlapping bars into the initial ground structure. Therefore computational efforts can be saved for the solution of this kind of problem. By modifying the elements of the stiffness matrix using Sigmoid function, the continuity of the objective and constraint functions with respect to shape design parameters can be restored to some extent. Some numerical examples demonstrate the effectiveness of the proposed method. | GuoXu LiuWei LiHongyan | 2003 | Acta Mechanica Solida Sinica2003，16，2： | 5 |
| 2 | Performance Analysis of DSR显示文摘In an ad hoc network, DSR is a widely discussed routing protocol. It has many advantages, including simplicity, correctness, and flexibility. All routing decisions for a packet are made by the sender of the packet, avoiding the need for up-to-date routing information at intermediate nodes and allowing the routes used to be trivially guaranteed loop free. It is also possible for the sender to use different routes for different packets, without requiring coordination or explicit support by the intermediate nodes. However, there is some inherent defect about DSR due to its features, such as, bluntness of on-demand, staleness of route caching, no metric about congestion and excessive reply. In this paper, we analyze these problems caused by some mechanisms of DSR and evaluate them through detailed simulations. Furthermore, we presented some suggestions to improve these mechanisms. At last, we introduced our correlative future work. | WANGYang LIHongyan LIJiandong | 2005 | Chinese Journal of Electronics2005，14，2： | 1 |
| 3 | An Efficient Routing Algorithm in Ad Hoc Networks显示文摘The Dynamic source routing protocol(DSR) is an on-demand routing protocol, designed specifically for use in multi-hop wireless ad hoc networks of mobile nodes. In this paper, some mechanisms such as the route's lifetime prediction, route’s creation time and an adaptive gratuitous route reply mode are introduced into DSR to get an efficient routing algorithm which is refered to E-DSR. The simulation results show that E-DSR can improve the packet delivery rate and reduce the routing overhead compared with hop-based DSR. | WANGShuqiao LIHongyan LIJiandong | 2005 | Chinese Journal of Electronics2005，14，1： | 0 |
| 4 | Characterization and expression of a cDNA, AmphiSDHD , encoding the amphioxus cytochrome b small subunit in mitochondrial succinate ubiquinone oxidoreductase显示文摘In this study, an amphioxus cDNA, AmphiSDHD , encoding the cytochrome b small subunit in mitochondrial succinate ubiquinone oxidoreductase, was isolated from the gut cDNA library of amphioxus Branchiostoma belcheri tsingtauense. It is 1429 bp in length, with an open reading frame of 465 bp coding for a protein of 154 amino acids. The deduced protein contains a mitochondrial targeting presequence of 65 amino acids rich in basic residues like arginine and hydroxy residues such as serine and threonine. Alignment of the amino acid sequences of AmphiSDHD and other eukaryotic SDHD proteins showed that AmphiSDHD has three transmembrane segments, and includes two histidine residues in the second transmembrane segment that are the putative binding sites for the heme b molecule. The phylogenetic tree constructed suggests that AmphiSDHD appears more closely related to vertebrate SDHD proteins than invertebrate ones. Northern blotting demonstrated that AmphiSDHD is ubiquitously expressed in amphioxus, being in line with the fact that SDHD is a house keeping protein. | MALifang ZHANGShicui ZHUANGZhimeng LIUZhenhui LIHongyan XIAJianjun | 2005 | Progress in Natural Science:Materials International2005，15，4： | 0 |
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