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For increased and various communication requirements of modem applications on embedded systems, general purpose protocol stacks and protocol models are not efficient because they are fixed to execute in the static mode. We present the Component-Based Communication Protocol Architecture （CCPA） to make communication dynamic and configurable. It can develop, test and store the customized components for flexible reuse. The protocols are implemented by component assembly and support by configurable environments. This leads to smaller memory, more flexibility, more reconfiguration ability, better concurrency, and multiple data channel support. 相似文献
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量子力学中的表象变换是一个重要问题,它的研究不仅对于深入理解量子力学的基本观点至关重要,而且对于如何利用量子力学观点处理具体问题也非常重要。本文利用牛顿力学中坐标系的观点,解释量子力学中为什么要引入表象变换的概念它和坐标变换的相同点和不同点。 相似文献
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都是在上世纪九十年代中后期登陆中国大陆市场．都是定位在曾经“稀少”的中高端人群,起初“曲高和寡”．也都是在中国市场．星巴克与哈根达斯获得了前所未有的“高歌猛进”。他们的成功之处,就在于他们是“面对”着消费者．而不是“背对”着消费者。 相似文献
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量子力学是物理本科专业一门重要的理论课程,但由于其抽象、深奥、难学也难教,对于学生的学习增加了难度。文章介绍了大学物理老师在讲授量子力学中的一些心得,以及如何使学生掌握基本知识的同时,提高学生的思维能力和对量子力学的兴趣。 相似文献
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The mass of the embedded systems are driven by second batteries, not by wired power supply. So saving energy is one of the main design goals for embedded system. In this paper we present a new technique for modelling and solving the dynamic power management （DPM） problem for embedded systems with complex behavioural characteristics. First we model a power-managed embedded computing system as a controllable Flow Chart. Then we use the Poisson process for optimisation, and give the power management algorithm by the help of Dynamic Voltage Scaling （DVS） technology. At last we built the experimental model using the PXA 255 Processors. The experimental results showed that the proposed technique can achieve more than 12% power saving compared to other existing DPM techniques. 相似文献
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