Modern Transportation

We are well aware of the role of modern transportation in our lives. Not too long ago, people endured great hardship in order to make a long journey. Moving heavy goods from one town to another involved hard labor. Today, we enjoy the convenience of various kinds of vehicles including ships, planes, trains, and automobiles, which allow us to go wherever we choose and make our workload much lighter.
　　But modern transportation, along with convenience has brought some problems. With more drivers on the road, there has been an increase in traffic jams and accidents. The exhaust from automobiles has added to our air pollution, not to mention additional noise caused by trucks and cars on the road.
　　Like everything else, modern transportation has more than one face. Here in China, we look to our government experts to solve these problems. Scientists are working on developing modern fuel that produces less pollutlon. However, we can all help reduce air pollution from automobiles by only driving when it is necessary and using public transportation when available.

communications

With the rapid development in low-power wireless communications.MEMS-based sensor technology and embedded computing,wireless sensor networks(WSN) have become a very hot research topic.Since sensor nodes have stringent limitations on energy,computation, communication and memory capabilities,in order to prolong the lifetime of the whole network, how to save discount wedding prom dresses energy of the sensors is a challenging issue.Topology control is one of the most important functions in WSN.Compared with tradition networks,sensor networks have the wedding dresses form china following features:A sensor network typically consists of a large number of nodes with a dense distribution.The nodes have very limited energy,storage space and computing ability.Wireless cheap nike shoes sensor networks usually work in high-risk regions and unable to get close,sensor nodes are likely to be battery powered,and it is often very difficult to change or recharge batteries for these nodes.Of these,wedding dresses 2nd energy efficiency for extending network lifetime is one of the most important topics to extend the lifetime of wireless sensor networks.Topology control protocol plays an important role in cheap evening dresses ,How to design a reasonable topology control protocol is the focus of this Lacoste Polo Shirts paper,the purpose of doing that is to save the limited energy of sensor nodes and improve network lifetime.
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