Tuesday, March 16, 2010

Peaceful Spring


Bitterly cold winter may once come, but now it has gone.
As my bike has been stolen, I have to run from one teaching building to another every day.
The bell declares the end of the last lesson and the beginning of a new journey. Tired as I am, at the sight of the bench, I go straight to it. As soon as I get seated, a world of fresh green immediately catches my eyes. Grass sprouts burst through the soil right in the place of the withered grass and turn the dull grey into fresh green. As I look up, I find those tall trees have also put on new clothes. Green, here and there, everywhere!Spring has come, I realize suddenly.
A breeze stirs, sending over breaths of fragrance. I trace it,surprised to find several lovely small white flowers dotted on a tree. And there are even some singing birds! I am so delighted with all these tiny lives that my fatigue vanishes all of a sudden.
The sky shows its purest blue. The sun generously gives out its heat and light, shining evenly on the grass, on the trees,on the roofs of houses, on the people passing by, also on me,quietly and tenderly. There come a couple of young people,strolling leisurely. A group of students are sitting in a circle on the grass and discussing something heatedly. Some are reading English but in low voices afraid of breaking the peace of the campus. Others are lying on the lawn, having a nap, or just enjoying the sunshine as I am.
I feel I am free, free of thinking anything. In such a pleasing environment, doing anything is a great pleasure. I am fully indulged in this tranquility. If only time could stop!
I turn on the radio to enjoy some light music. Much to my disappointment, however, almost all the programs are about the war in Iraq. It is hard to believe that under the same blue sky,some people are suffering from bleeding and death of war while others are enjoying a happy life.
The sun is hidden by the clouds. After a few seconds, it shines brightly again.
Peaceful life seems to have gone, but it will come back one day, I am sure.

Chapter 3

In the immense universe, wars are comets befalling on the earth while peace and development are stars shining in human beings.On October 1st, 1949, a new nation stood up in the ancient Orient. The People’s Republic of China, like a newly-born giant, undertaking vast expectation and great missions, commenced another Long March.Grandpa was appointed to work in the Municipal Administration of Wuhu, Ahhui Province. In the 1950, grandpa met a young kind and nice lady who later became my grandma. Grandma always says that grandpa was a really gentle and handsome officer and the first sight she saw him, she knew that he was the man she would rely on all her life.Grandpa devoted almost all his day to the affair in the administration. His busy job made grandma feel lonely sometimes although she understood and supported him. The Korea War broke out in our neighbor country and the crucial situation imposed the same adversity on us as well. Grandpa’s work demanded his intelligence and bravery.One night, grandpa came back home and sat on an armchair smoking. Grandma could tell that something serious happened for grandpa had given up smoking since the marriage. Grandpa gazed at the distant place through the window. His eyes were filled up with fatigue and sadness. Grandma sat beside him and leaned her head against his shoulder.“Last night a comrade of the mine was assassinated by a KMT spy on his way home. It is a great loss to our administration. And I lost an intimate comrade…” grandpa said and then sank into silence. From that day on, grandma was awaiting grandpa every night. She made up all kinds of excuses to stay up until he came back. Grandma’s lonely life came to an end in 1958 when she gave birth to their first son who is my father their life blazed although it was eight years since their marriage.During the period of socialist construction, grandpa exerted himself and devoted his golden age to the cause with a low starting point. Grandpa always says,” That was the second ‘eight-year war’ in my life. However, this is your life. Times give birth to you and you toil and sweat to repay times.”

Data Monitor and Control System

In recent years,wireless sensor networks is important for its scientific value and practical value,both at home and abroad led to research institutions and governmental organizations in a wide range of concerns,"ubiquitous" wireless sensor network technology has greatly expanded the limits of people's ability to access to information; IPv6 as the core of next-generation Internet protocol,is rich in resources with addresses, as well as agreements to improve safety and so on.Wireless Sensor Networks combined with IPv6 is the trend of the future network.The IPv6-WSNs fulfill the exchanging information between objects as well as between objects and humans.By some form of access to existing networks,it can make the world anytime,anywhere access of users to IPv6 wireless sensor network data, and completed the real-time control of the region.You had cheap ralph lauren polo shirts at″I like it!″Depending on the access,design a set of server data monitoring system,that is,sensor data acquisition and easily into the form of observation,user can send control commands on the server to complete the efficient management of sensor node,is the IPv6 wireless sensor networks essential for the study.Cheap Lacoste Polo Shirts are popular everywhere. First of all,this paper discusses the structure of sensor node hardware,the essential component of IPv6 wireless sensor network system,given the architecture of IPv6 wireless sensor network,introduced the two main ways of access and analyze data on the server system model,and designed a framework for data monitoring system.Do you like these polo Shirts?and then use JSP technology to make the data surveillance system,the system can achieve real-time access to mysql database,extracted from the wireless sensor network nodes from any number of data and displayed them in the coordinates map,clearly contrast to the users;then in the data control system,using JSP technology to make network nodes labeled map,by clicking on the corresponding node,through the embedded terminal to send the command to activate command procedures,sending control commands to control the node to realize the functions of sleep and so on.And then,the actual testing and functional verification of the data monitoring system in the case of Ethernet access had been done.Finally,the paper summarizes the ideas and proposes future work.
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Wireless Sensor Network


A wireless sensor network(WSN) typically consists of a number of sensor nodes which can sense,measure,and gather information from the environment. Polo shirts are yours now! With the development in Micro-Electro-Mechanical Systems(MEMS) and Very Large Scale Integrated circuits(VLSI) technology,ubiquitous wireless sensor networks have gained worldwide attention in recent years,and are expected to play an important role in the future society,such as for military applications,health care,traffic control,home automation,industrial process and environmental monitoring,etc.Here is the best chi hair straightener!Most of the sensor network devices are designed to be small and low-power for low data-rate transmissions,and therefore energy and power saving is important for extending lifetime of the network devices as well as the network.Besides,the scalability to hundreds or thousands of nodes is another essential issue in designing wireless sensor networks.Oh,Jerry,don't let's ask for the moon.We have the ralph lauren polo shirts. This thesis studies the design of the wireless sensor network with a cluster topology based on the IEEE Std.802.15.4.By making use of the Slotted CSMA/CA model given in Sofie Pollin's paper,many relationships among the network and sensor parameters are derived in order to further solve the optimization problem.Given the throughput requirement or the sensor nodes distribution,the design finds the amounts of time allocated for contention-based and contention free transmissions at each cluster head as well as the associated status of the sensors in the overlapping area of clusters. The optimization results show that the design can achieve the objective to balance the energy consumptions of all cluster heads and utilize the limited resources effectively to extend lifetime of the network.
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Friday, March 12, 2010

resisting narrow band


The spreading spectrum(SS) communication system has stronger ability of resisting narrow band, multipath and jamming interference than that of the conservation communication systems, and it also has the characteristics of low probability of intercept and multiple access secure communication. Nowadays, the SS technology has gotten rapid progress. This thesis primarily focuses on the synchronization of the pseudo-code and the carrier. It researches the structure and performance of DSSS as well as calculates the relevant parameters. In addition, it improves enveloping algorithms. Finally, the de-spread and the demodulator also have been designed and implemented based on ISE9.1 to prove that the projection is correct.The thesis studies characteristics of spread spectrum communication systems, related technology development at home and abroad and related theoretical basis. It designs the de-spread and demodulator of DS-QPSK receiver. The de-spread mainly focuses on the acquisition and tracking, researches the structure and performance as well as calculates the relevant parameters. Then it designs DDC, PN generator, enveloping extractor, mul-channel fast PN arrestor, PN tracking phase discriminator and PN clock accommodator.

Wednesday, March 10, 2010

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