IP-DSLAM存在的问题及解决方案

对IP-DSLAM的分类和实现等方面进行了简要的阐述,分析和讨论了IP-DSLAM在实际应用中存在的一些问题,并提出相应解决方案。     

Tandem addition-cyclization reaction catalyzed by ytterbium chloride: An efficient one-step synthesis of 2-amino-4H-3,1-benzothiazine

A clean,efficient method to synthesize 2-amino-4H-3,1-benzothiazines by ytterbium chloride-catalyzed tandem addition-cyclization reaction of o-aminocinnamate and isothiocyanates under solvent-free conditions is developed.     

A Compromise Approach to Lexicographic Optimal Solution in Multiple Objective Programming

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Privacy-Aware Examination Results Ranking for the Balance Between Teachers and Mothers

As the main parent and guardian, mothers are often concerned with the study performance of their children.More specifically, most mothers are eager to know the concrete examination scores of their children. However,with the continuous progress of modern education systems, most schools or teachers have now been forbidden to release sensitive student examination scores to the public due to privacy concerns, which has made it infeasible for mothers to know the real study level or examination perfor...     

Disturbance observer based finite-time coordinated attitude tracking control for spacecraft on SO(3)

To solve the problem of attitude synchronization control for spacecraft formation flying(SFF) suffering from external disturbances under a directed communication topology, a sliding mode disturbance observer(SMDO) based on the finite-time control strategy is developed to observe the time-varying external disturbance via estimating the upper bound of its first derivative. Meanwhile, the rotation matrix is employed to describe the attitude of SFF for the purpose of the avoidance of singularity and...     

高密度互连(HDI)印制电路板技术现状及发展前景

随着电子设备向轻薄短小、高性能、多功能的方向发展以及电子组装技术的进步,用于电子元器件互连的印制电路板产品从通孔插装技术(THT)阶段全面走上了表面安装技术(SMT)阶段,走向了芯片级封装(CSP)阶段,并正逐步走向系统级封装(SIP)阶段。一个以导通孔微小化和导线精细化等为主导的新一代HDI板产品已经在PCB业界筹划、建立和发展起来了,并将成为下一代印制电路板的主流。本文对HDI板定义,特点,关键技术,应用以及目前发展状况进行了综述。     

论体育运动中的道德规范

本文结合体育教学与训练问题,针对运动员和其他相关人员的人生观、价值观和体育道德的现状,采用综合分析的方法,从不同的层面探讨道德规范在体育中的渗透和发展趋势,提出了道德规范的教育途径和方法。为纠正体育界一系列的不正之风、提高他们的思想道德素质,为造就思想坚定、技术过硬的优秀体育工作者群体,从而为开创体育事业的新局面提供参考依据。     

Default Path and Dedicated Path: A New Approach to Realize IP Directly Over WDM

Combining IP and WDM is an attractive direction for research. Instead the point to point linking method, this paper proposes a new approach to realize IP directly over WDM, called DPDP (default path and dedicated path), presents a conceivable architecture in detail and explains its working procedure. A lot of problems related with this design are also discussed.