A novel architecture for ubiquitous location based services in TD-SCDMA

Advances in mobile devices, sensors and wireless networks have motivated the development of location based services(LBS) applications. However, most of the positioning methods specifically designed for either indoor or outdoor and their accuracy and precision differs greatly, so it’s difficult using only one positioning method to meet all people’s demands. This paper proposes a new architecture for ubiquitous location based services in TD-SCDMA. In this architecture the proper positioning methods are determined by the uses’ surroundings and the demands of accuracy and precision, and the problem that the user’s environments change has been also resolved commendably. And this architecture solves the problem that environment changes while positioning. The simulation shows that everyone can use the location based services anywhere and anytime with the mobile terminal through this architecture.     

The Nonlinear Dynamical Model for the Evolution of Productivity

1IntroductionItisgraduallyrecogllizedthatideasfi.olntiletheoryofllolllineardynamicsareusefulforeconomicsandfinallce.Infact,intheearly1950'sRicharedGoodal.illilasalreadyusedllonlineartechniquesintilestudyofdynamiceconolllicprocesses.Heputforal'ardtileideaofillustratingpersistellt,deterlllillisticoscillatiollswitllillamultiplier-acceleratorlllodelsetupby1lleansofalimitcycleofallolllillear.taboo-dilllellsiollalflowll].Withtheprogressoftheresearchoncomplexsystems.someconceptsalldmethodsillthellon…     

地质材料弹塑性本构关系的塑性势理论

介绍塑性势理论的由来、发展和现状。地质材料全过程应力?应变曲线在峰值前后具有不同的稳定状态, 因此其弹塑性本构关系必须在应变空间中表述。给出基于塑性势理论在应变空间和应力空间中的地质材料本构关系, 并讨论弹塑性耦合理论。当前在有限元位移法分析中, 常用的塑性势理论本构关系式是应变空间表述的实用形式。弹塑性耦合理论较为严密和完善, 但地质材料刚度劣化参数还需更多的实验数据支持。     

工程岩石类材料的不稳定性

基于非关联流动理论和弹塑性耦合理论, 研究工程岩石类材料的不稳定性。由于工程岩石类材料具有刚度劣化特性, 岩石类材料在软化塑性、理想塑性和低强化塑性情况下均可能呈现不稳定。对于弹塑性耦合理论, 可通过本构矩阵正定性的讨论, 得到工程岩石类材料的不稳定条件; 对于塑性势理论, 可通过本构矩阵对称部分的正定性来研究材料的稳定性, 能够得到相同的结果。     

Hybrid location determination technology within urban and indoor environment based on Cell-ID and path loss

The location determination technology based on simple delay evaluations or GPS is not accurate enough or even impossible in urban and indoor environments due to the multi-path propagation. To enhance the location accuracy and reduce the operation cost within these environments, this paper proposes a novel hybrid location determination technology which combines CELL-ID with the database correlation method. The proposed method generate the prediction database of path loss according to CELL-ID, and after the computation the smallest squared error of measured path loss and the prediction path loss,the location of the mobile terminal is decided by the coordinates of the best matching matrix entry.     

三种鲍腹足肌胶原多肽抗氧化性研究

研究了皱纹盘鲍(Haliotis discus hannai)、黑足鲍(Haliotis iris)及其杂交鲍腹足胶原多肽的制备和性质,并采用总还原力、对O^-₂·和·OH自由基清除率和致衰小鼠灌胃胶原多肽后体内MDA、SOD和GSH-PX变化来评价3种鲍胶原多肽的抗氧化性。结果显示,皱纹盘鲍、黑足鲍及其杂交鲍的胶原蛋白分别占总蛋白含量的23.44%、30.78%和26.92%,皱纹盘鲍与杂交鲍胶原蛋白含有α1、α2、β和γ链,而黑足鲍胶原蛋白没有γ链;来自3种鲍的胶原多肽均呈现出较高的还原力、O^-₂·和·OH自由基清除能力,对O^-₂·清除率的IC₅₀值分别为3.03、2.40、1.15 g/L,对·OH清除率的IC₅₀值分别为4.12、3.58、3.70 g/L;灌胃3种胶原多肽后,致衰小鼠肝脏和血清的MDA含量均降低,SOD和GSH-PX活力均上升。三者比较,杂交鲍胶原多肽在降低MDA含量、提高GSH-PX活力的作用最强,黑足鲍胶原多肽在提高SOD活力的效果最显著。     

阵列天线DOA跟踪环路鉴别器性能分析

利用阵列天线波束指向空间相关性的特点,可以构建一个类似于传统锁相环结构的闭合环路以实现对导航信号来波方向(direction of arrival, DOA)的跟踪。DOA跟踪环路中鉴别器的实现方法主要有实部相减相干法、幅值相减归一化法、功率相减归一化法,首先基于波束形成技术建立了阵列天线导航接收机DOA跟踪模型,在此基础上从鉴别器增益、收敛范围和输出噪声方差3个方面对比分析了采用不同角度鉴别器算法的跟踪性能,最后对其进行了仿真验证。     

利用无风力矩智能镜面为建筑增加日照的可行性实验

将计算机技术与建筑节能结合,研制基于风力矩相互抵消及施加预应力的无风力矩智能镜面,为寒冷地区建筑增加日照,并以某建筑群为例进行可行性实验.结果表明:无风力矩智能镜面能长期、稳定地为建筑提供日照,其光、热舒适性较高,但杀菌能力尚不明确;施加预应力后,抗风性能较理想,结构质量较轻,更稳定可靠,但在特定角度有一定炫光.     

基于时差校正的长基线宽带测向算法

研究长基线宽带测向问题,由于传统测向算法受到相位解模糊条件的限制,天线孔径长度设置较短,因此无法进一步提高测向精度。基于宽带信号时延估计具有高精度的特点,提出了基于时差校正的宽带测向及解模糊算法,并且对其性能和使用条件进行详细的分析。由于基线长度不受传统方法的限制,因此在长基线条件下,具有非常高的测向精度。仿真结果证实所提算法只需较少的天线阵元,却具有很高的测向精度。     

针对多空中威胁目标的联合火力协同分配打击策略

威胁评估及火力分配打击是打击决策中的重要环节,战场环境因素的复杂性、不确定性,使得现有的威胁评估算法在进行威胁度计算时考虑的因素不够全面,难以有效支撑火力打击决策环节。因此,本文提出一种考虑、飞行高度、空中运行姿态、行进速度、携弹数量的多空中威胁因素问题模型,基于此模型获取火力协同打击策略。利用本文方法解算出在某一任意环境下,火力系统的最优协同打击策略。通过仿真对比经典粒子群优化算法,本文算法能够更快收敛,验证了本方法的有效性和可靠性。