A novel multi-packet reception scheme in wireless sensor networks(WSN) based on network-assisted diversity multiple access(NDMA) is proposed,which exploits cooperative diversity to overcome multi-path fading and selects relay nodes according to the characteristics of WSN and full-rank requirements of channel matrix using cross-layer methods.

In order to overcome these drawbacks, an improved ZVS three-level converter using passive auxiliary net is proposed in this paper.

An auxiliary net, which is composed of a coupling inductor and capacitors, and a current-doubler-rectifier are introduced.

To realize soft switching of all switches, the theory of the topology of PS Full-Bridge Zero-Voltage-Switching PWM dc converter with auxiliary net is studied in detail and the different way of designing parameter as the switch is IGBT and MOSFET are presented .

In order to solve this question,an auxiliary networkmethod is proposed,namely theevery distribution center in the transportation network is split into two nodes which are linked to form new arcs in the new network,and eacharc is enduedwith parameters.

It can realize ZVS in the entire load range with the use of voltage complementary auxiliary network.

On the Web-aided Process Writing Approach;

The concepts of a network address and a domain name on the Internet are described.

In this paper, static network address translation, dynamic network address translation and network address port translation for applied in firewall are discussed, by these methods,we can find the security shield solutions of inner- network which exist in the communication between inner- network and outer- network, moreover, the limited Internet IP addresses are also saved.

This paper discusses the scheme of Intranet special network address and network address translator in Intranet.