Modeling of Double Lane Change Maneuver of Vehicles

Lane change maneuver is one of most riskiest driving tasks. In order to increase the safety level of the vehicles during this maneuver, design of lane change assist systems which are based on dynamics behavior of driver-vehicle unit is necessary. Therefore, modeling of the maneuver is the first step to design the driver assistance system. In this paper, a novel method for modeling of lateral motion of vehicles in the standard double-lane-change (DLC) maneuver is proposed. A neuro-fuzzy model is suggested consisting of both the vehicle orientation and its lateral position. The inputs of the model are the current orientation, lateral position and steering wheel angle, while the predicted lateral position and orientation of the vehicle are the outputs. The efficiency of the proposed method is verified using both simulation results and experimental tests. The simulation and experimental maneuvers are performed in different velocities. It is shown that the proposed method can effectively reduce the undesirable effects of environmental disturbances and is significantly more accurate in comparisons with the results in the recent available papers. This method can be used to personalize the advanced driver assistance systems.     

基于改进的屈曲模态阵型的锥形连续柱体结构屈曲分析（英文）

Elastic critical buckling load of a column depends on various parameters, such as boundary conditions, material, and crosssection geometry. The main purpose of this work is to present a new method for investigating the buckling load of tapered columns subjected to axial force. The proposed method is based on modified buckling mode shape of tapered structure and perturbation theory. The mode shape of the damaged structure can be expressed as a linear combination of mode shapes of the intact structure. Variations in length in piecewise form can be positive or negative. The method can be used for single-span and continuous columns. Comparison of results with those of finite element and Timoshenko methods shows the high accuracy and efficiency of the proposed method for detecting buckling load.     

一类新的(k+2,k) Hadamard MSR码

为降低分布式存储系统中节点的存储量,构造了一类新(k+2, k)Hadamard MSR码.该码的每个编码矩阵皆对应于2个值,供其对角元素选取.在编码矩阵中,这2个值循环出现,且不同的矩阵,循环出现的周期不同.基于这一特性构造了节点的修复方案,将失效节点中的个数据分成/2组,每一组重建2个数据,其他k+1个节点为每一组各提供1个数据.证明了若新码编码矩阵的对角元素可取的2个值不相等,则可最优修复系统节点;若所有编码矩阵对角元素可取的2个值的和为同一不为0的值,则可最优修复第1个校验节点;若所有编码矩阵对角元素可取的2个值的逆的和为1,则可最优修复第2个校验节点.新码的节点存储量降低到了Hadamard MSR码的理论界,可最优修复任意系统节点和1个校验节点.