摘要:Ubiquitous Computing appears with the development of distributed computing and mobile computing. This paper discusses, analyzes the characteristics and requirements of ubiquitous computing. One ubiquitous computing application architecture model including context -aware and service discovery mechanism is given and discussed in detaih.%普适计算随着分布式计算和移动计算的发展而出现.分析了普适计算的特征和需求,提出了一个针对普适计算系统应用的包含上下文感知和服务发现机制的框架设计模型,并进行了深入讨论.
摘要:We focus on the equality constrained weighted least squares problem (WLSE), with the weight matrix severally stiff. We show that in this case, perturbations of the constrained weighted pseudo -inverse, the constrained weighted projections,and the WLSE problem are stable, ff and only if perturbations of the coefficient matrix satisfy certain rank preserving conditions.%研究等式约束刚性最小二乘问题.证明了对于刚性问题,约束加权广义逆,约束加权投影和等式约束加权最小二乘问题的扰动是稳定的,当且仅当系数矩阵的扰动满足若干秩等条件.