高阶（2＋1）维Broer—Kaup方程的多孤子解结构

利用推广的齐次平衡方法，首先将高阶（2＋1）维Broer-Kaup方程线性化，然后构造出丰富的广义孤子解，包括单孤子解，单曲线孤子解，单dromion解，多dromion解，本方法直接而简单，可推广应用一大类复杂的（2＋1）维非线性演化方程。     

Anonymous multipath routing protocol based on secret sharing in mobile ad hoc networks

Because the intrinsic characteristics of mobile ad hoc networks(MANETs) cause several vulnerabilities,anonymous routing protocols attract much more attention in secure mobile ad hoc networks for the purposes of security and privacy concerns.Until recently,lots of anonymous routing protocols have been proposed.However,most of them are single path or use one path at a time,and the multipath schemes can not thwart both the passive attacks and active attacks simultaneously.Thus an anonymous multipath routing protocol based on secret sharing is proposed.The protocol provides identity anonymity,location anonymity,data and traffic anonymity by employing cryptograph technology and secret sharing in MANET communication process.Meanwhile,a hash function is introduced to detect active attacks in the data transmission process.The protocol can effectively thwart various passive attacks and reduce the successful probability of active attacks(such as interception and physical destroy attacks).Simulation results show that the proposed scheme provides a reasonably good level of network security and performance.     

Comprehensive optimal control on seismic response of a single-tower self-anchored suspension bridge

Earthquake may cause severe damage to all kinds of bridge such as the falling down of the girder; therefore,effective measures should be employed to control the seismic displacement. In this paper,the method of comprehensive optimal control,com-bined with analytic hierarchy process,is employed to investigate the seismic response control of the Nanjing Jiangxinzhou Bridge,which is a single-tower self-anchored suspension bridge (SSSB). Also,3-dimensional nonlinear seismic response analyses are con-ducted. Three types of practical connection measures for seismic response control of SSSB are investigated,and the optimal pa-rameters of the connection devices are achieved by this method. Results show that both the elastic connection devices and the damp-ers with rational parameters can reduce the seismic displacement of the bridge effectively,but the elastic connection devices will in-crease the seismic force of the tower. When all factors are consid-ered,the optimal measure is by using the elastic connection devices and the dampers together. These results can provide references for seismic response control of SSSBs.     

Construction of protograph LDPC codes with circular generator matrices

The application of protograph low density parity check(LDPC) codes involves the encoding complexity problem.Since the generator matrices are dense,and if the positions of "1" s are irregularity,the encoder needs to store every "1" of the generator matrices by using huge chip area.In order to solve this problem,we need to design the protograph LDPC codes with circular generator matrices.A theorem concerning the circulating property of generator matrices of nonsingular protograph LDPC codes is proposed.The circulating property of generator matrix of nonsingular protograph LDPC codes can be obtained from the corresponding quasi-cyclic parity check matrix.This paper gives a scheme of constructing protograph LDPC codes with circulating generator matrices,and it reveals that the fast encoding algorithm of protograph LDPC codes has lower encoding complexity under the condition of the proposed theorem.Simulation results in additive white Gaussian noise(AWGN) channels show that the bit error rate(BER) performance of the designed codes based on the proposed theorem is much better than that of GB20600 LDPC codes and Tanner LDPC codes.     

基于熵权-层次分析法和优劣解距离法的飞行员胜任力评价

结合熵权法、层次分析法（AHP）、优劣解距离法（TOPSIS），提出了一种用于评估飞行员胜任力的多准则决策框架。首先，根据国内外飞行员胜任力指标框架研究进展，构建飞行员胜任力评价指标体系。其次，采用熵权法计算飞行员核心胜任力指标权重。随后，由专家使用AHP对飞行员心理胜任力和作风胜任力指标赋权，并建立融合的权重指标体系。最后，根据评价指标权重，采用TOPSIS方法对飞行员胜任力进行排序。通过将提出的方法应用于航线飞行员胜任力评估，验证方法的可行性。     

多时滞二阶中立型方程的振动性（英文）

利用积分平均技巧,得到了二阶中立型Emden-Fowler方程振动的充分条件,结果推广并改进了一些已有的结果。     

两个同时求多项式零点的3阶Newton型迭代法

构造了两个同时求多项式零点的Newton型并行迭代法，同时证明它们的收敛性，证明其收敛阶为3，并讨论其初始条件，最后给出数值例子．     

Modeling and Experimental Study of PEM Fuel Cell Transient Response for Automotive Applications

This paper presents an analysis of the dynamic response of a low pressure proton exchange membrane (PEM) fuel cell stack to step changes in load, which are characteristic of automotive fuel cell system applications. The goal is a better understanding of the electrical and electrochemical processes when accounting for the characteristic cell voltage response during transients. The analysis and experiment are based on a low pressure 5 kW proton exchange membrane fuel cell (PEMFC) stack, which is similar to those used in several of Tsinghua's fuel cell buses. The experimental results provide an effective improvement reference for the power train control scheme of the fuel cell buses in Olympic demonstration in Beijing 2008.     

Performance prediction for Grid workflow activities based on features-ranked RBF network

Accurate performance prediction of Grid workflow activities can help Grid schedulers map activities to appropriate Grid sites.This paper describes an approach based on features-ranked RBF neural network to predict the performance of Grid workflow activities.Experimental results for two kinds of real world Grid workflow activities are presented to show effectiveness of our approach.     

现代性的诊断及治疗——塔尔科特·帕森斯思想述评

帕森斯的社会理论在社会学界拥有较高的地位，虽然他的理论过于宏观和抽象，但毕竟他是尝试将欧洲经典社会学理论糅合成一个前所未有的宏大框架的第一人。在研究现代性问题时，塔尔科特·帕森斯是一个无法跨越的人物。帕森斯的现代性理论可从现代性的可能、现代性问题的诊断以及治疗三个方面加以阐释。