network protocol stack

Implementation of the network protocol stack is also presented, components of which include: the receiving function of the physical layer, a time synchronization mechanism based on DMTS, a sleep/listen working mechanism, a CSMA/CA algorithm with ACK and retry, a reliable energy-aware routing algorithm and other required functions. Meanwhile an embedded operating systemμC/OS-Ⅱis transplanted onto the platform to implement the real-time multi-task environment of the protocol stack. In addition, a real-time monitor system of WSN is developed to provide users with network information and monitor network operations.This thesis also includes performance evaluation of the CSMA/CA mechanism, the routing strategy, the preemptive task scheduling mechanism and the data transmission application. The routing strategy and processes of routing establishment, routing failure and routing maintenance are debugged and hence verified. The results show that the WSN platform ensures operation stability and is capable of performing different tasks, by which further research can be achieved.

We Need to Live in a Clean Environment

As far back as the 16th century, a hearty band of Portugese sailors drifted on the Pacific Ocean. Off the shore of southern China, they Cheerfully found an island, the subduing Charm of which made all them cast their eyes on it. Awe-struck on seeing this delicate masterpiece God had created they could not help crying out, “Ilha Formosa”, meaning “beautiful island.” I feel the need-the need for cheap Wholesale nike shoes！ That was what Taiwan was first named. Now, four hundred years later, just let’s see what has become of our beautiful island. Population as by far increased, our country is marked by the surpassing growth of economy; living standards are high up. Everything is good, but the environment leaves much to be desired. The air we breathe is polluted by the rubbish fume; our drinking water is contaminated by the garbage water from factories; the agreeable beauty of Nature is ruined by sightseers. The once drinkable water become even too dirty to swim in. Oh, haw miserable it is to live in such an environment! Who is to blame for the “murder”, nobody can answer. Everybody should be responsible.Cheap Nike shoes are very nice here! For this is the very of ours. We must try our utmost to improve our surroundings. And this must be achieved by the government and the public as well. To make the air clear. We give thought to the automobiles and factories. The government should, in on time, enact strict laws to punish the vehicles producing harmful rubbish fume. This will also enhance with the factories. I love northface jackets.Moreover, factories here are too agglomerated; the government should try to, as it seems possible, disperse them properly. By so doing we can reduce the air pollution to the minimum. Secondly, we must prevent garbage from being thrown away into rivers, ponds, and lakes. With the water pollution going on someday we shall die with no water to drink at all. Finally there are scenery spots waiting to be re-beautified. Strange in that far too many tourists left rubbish, but few picked up, when they visited the sceneries. What is our Environment bureau for? They must exercise their authority over the tourists to punish them sternly when they are found defiling Nature. Only in these may can we cure the problems drastically, and regain perfect environment to live in. We are often told that prevention is better than cure. Indeed it is. But now that there are the problems, we can only check the potential tendency and try our best. We do so not only for ourselves, but also for our posterity. Four years ago, a girl singer cried, “don’t kill the world, don’t let her die. Do not destroy basic ground .Don’t kill the world, she’s all we have. Lend your to Nature’s cry.” Yes, we have only one earth . On this land we live; in this land we shall die. We can make our environment better and better if we persevere. And we shall persevere. From now on, let no efforts be spared in improving our very own environment. The supreme obligation falls upon none but you and I, to whom our land belongs.

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On Marriage

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A person with 8+ years experiences in IPO(International Purchasing Operations) environment with product development.Where can I get nike running shoes?Engineering, QC/QA, logistics background and Overseas(UK) Work Experience,expert knowledge of global procurement.Familiar with local and overseas material markets.
Career Objective:
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