802.11n

802.11n is WiFi alliance in 802.11a / B / g behind a wireless transmission protocol, in order to achieve high bandwidth, high quality WLAN services, the wireless local area network to Ethernet performance level, task group 802.11 ( TGn N ) emerge as the times require. The 802.11n standard to 2009 to get IEEE approval, but using the MIMO OFDM technology has many manufacturers, including DLink, Airgo, Bermai, Broadcom and Agere systems, Atheros, Cisco, Intel and so on, products include wireless network card, wireless routers, but also has a large number in the PC, application of notebook computers.

Produce

In today's wireless LAN technology interweave of the Warring States period, WLAN, Bluetooth, HomeRF, UWB, blossom eagerly, but IEEE802.11 series of WLAN is the most widely used. Since 1997 since the implementation of IEEE802.11 standard, 802.11b, 802.11a, has 802.11g, 802.11e, 802.11f, 802.11h, 802.11i, 802.11j and other standards or brewing, but WLAN is still faced with insufficient bandwidth, roaming is not convenient, management is not strong, system security and no killer application. As the application of VoIP in a new field that the VoWLAN, although the industry was seen as WLAN the most promising killer application, but since the four" not", it is difficult to develop further. 600Mbps wonderful prospects, 100Mbps net throughput;

Application

The rate of transmission, 802.11n can be WLAN transmission rate by current 802.11a and 802.11g with 54Mbps, 300Mbps and 600Mbps raised to high. Thanks to the MIMO ( MIMO ) and OFDM ( orthogonal frequency division multiplexing ) technology combined application of MIMO OFDM technology, improve the quality of wireless transmission, the transmission rate is improved greatly.

In terms of coverage, 802.11n using smart antenna technology, through multiple independent antenna consists of antenna array, can dynamically adjust the beam, ensure that WLAN users to receive stable signal, and can reduce the interference from other signals. Therefore the coverage can extend to several square kilometers, making WLAN mobility is greatly improved.

Compatibility, 802.11n uses a software radio technology, it is a fully programmable hardware platform, so that different base station and terminal of the system are available through this platform to realize the intercommunication and the compatibility of different software, which makes WLAN compatibility can be greatly improved. This means that WLAN can not only realize the 802.11n forwards and backwards compatible, but also can realize the combination of WLAN and wireless wide area network, such as 3G.

Two camps

Unfortunately, 802.11n is now a" standard lag, the product of premature " embarrassing position. The 802.11n standard to 2009 to get IEEE approval, but using the MIMO OFDM technology has many manufacturers, including DLink, Airgo, Bermai, Broadcom and Agere systems, Atheros, Cisco, Intel and so on, products include wireless network card, wireless routers, but also has a large number in the PC, application of notebook computers.

The dominant 802.11n standard technical camp two, WWiSE ( World Wide Spectrum Efficiency ) and TGn Sync alliance alliance. The two camps have hope in the next generation wireless LAN standard competition in the priority position, but the two camps of technical framework has been more and more similar, for example, are using MIMO OFDM technology, and in August 2nd the message says, they have decided to forgive and forget, common to the United States Institute of electrical and Electronics Engineers ( IEEE ) submitted the 802.11n Wireless version.

In the first half of 2007 have been identified in 802.11n 2 draft, can fully support the future official standard. And IEEE is expected in the first half of 2008 through formal standards.

Network Bridge

A network bridge

Network bridge to achieve share

The host and client in addition to the use of software, can also use XP onboard network bridge connection

Double card machine host, the host desktop, right-click" network neighborhood" shortcut menu appears, click on the shortcut menu" attribute", the "network connections" window, press the "Ctrl" button on the left, the mouse in order two card icon selected two card. Hold down the "Ctrl " key, and then click the right mouse button pop-up shortcut menu, mouse the left key click the shortcut menu" bridging " option, the system prompt" Windows is bridge connected, please wait ..." Tips, later appearing" network bridge MAC bridge miniport" icon, said bridge has been successfully connected to.

The client machine card and host line connection, completion of the above steps, two machines can go online at the same time, no mutual interference

What is the bridge?

Bridges at the data link layer, the two LAN together, according to the MAC address to forward the frame, can be seen as a" low layer router ( router" work in the network layer, according to the network address such as an IP address forwarding ).

Remote bridge through a generally slower link ( such as a telephone line ) connecting two remote LAN, the local bridge, performance is more important, but on a remote bridge, in long distance running is more important.

Bridge and router are compared

The bridge does not understand its forwarding frame protocol information, which enables it to be at the same time in the same general processing IP, IPX protocol, it also provides no routing protocol network ( such as NetBEUI ) piecewise function.

Because the router processing network layer data, so they are more likely to interconnect the different data link layer, such as a token ring network and Ethernet network. The bridge is usually better than the router to control. Like IP protocols have complex routing protocol, the network management is easy to manage routing; IP protocol also provides more how the network segment information ( even if the address is also provides such information ). While the bridge is only MAC address and the physical topology for work. So the bridge general for small and relatively simple network.

Males often have an aphrodisiac in 8 kinds of food

Hot yang foods 1 shrimp

Shrimp flavour is delicious, nourishing and officinal effect is higher. Motherland medicine thinks, its sweet, salty, sex is lukewarm, impotence, kidney replenishing essence, milk power. Where a weakness, shortness of breath and weakness, do not think of eating, can be used as tonic food. People often eat shrimp, have strong physical body effect.

Hot yang foods 2 mussels

Mussel pearl mussel, also known as vegetable. Rich in protein, vitamin B, iodine, zinc, iron, calcium, phosphorus and other. The salty taste, temperature, temperature and renal solid essence, Qi tonic effect. Applicable to male sexual dysfunction, impotence, spermatorrhea, housing workers, the disease such as diabetes. Men often feed can strong body to enhance sexual function.

Hot yang foods 3 loach

Loach containing high quality protein, fat, vitamin A, vitamin B1, niacin, phosphorus, iron, calcium and so on. Its sweet, flat, with Buzhong Yiqi, nourishing spermatogenic function. On the regulatory function has good effect. Loach containing a special protein, promote the formation of sperm function. Adult males can often eat loach tonic.

Hot yang foods 4 donkey

As the saying goes:" the goose, the ground of donkey meat." The meat tastes delicious, is a kind of high protein, low fat, low cholesterol meat. Chinese medicine, donkey meat taste sweet and cool, have nourishing qi, yin and Yang, soothe the nerves to bother efficacy. The ass kidney, Wen Wei Gan, beneficial kidney yang, strong gluten Zhuanggu efficacy. Treatment of impotence do not move, Yaoxisuanruan dengzheng.

Hot yang foods 5 oyster

Oyster, oyster son also called Lige. Rich in zinc and iron, phosphorus, calcium, high protein, carbohydrate, vitamins. Its flavor is salty, slightly cold, have nourishing yin and suppressing yang, Bushen seminal effect. Men often eat oysters can enhance sexual function and sperm quality. The man spermatorrhea, weary, deficiency of the kidney impotence virtual loss has a good effect on.

Hot yang foods 6 quail

Quail saying" eat birds, also the number of quail". Quail meat flavor, sweet but not greasy, have been listed as grade wildfowl. Quail meat not only taste delicious, nutrition is rich, contain many kinds of inorganic salts, lecithin, hormones and various human body essential amino acids. Quail eggs and meat, is a good tonic, having strong benefit. Motherland medicine thinks, quail meat can" make up the five internal organs, Yijing blood, warming kidney and enhancing Yang" men often eat quail can enhance sexual function and increase the gas force, strong bones and muscles.

Hot yang foods 7 eggs

The egg is sexual function of human body nutrition carrier, is after the sex life to recover the best" reducing agent". The Arabs in the wedding a few days ago, to roast eggs, to ensure that the wedding night health happiness. While doctors in India are built on, couples have sex before, should drink made with eggs, milk and honey boiled rice porridge. Our country folk also circulated wedding dinner, fried egg customs. The newlyweds frequent sex life, greater physical exertion, additional feed egg contribute to the rapid restoration of physical strength.

Hot yang foods 8 pigeon meat

The dove's fecundity is very strong, strong sexual desire, male and female mating are very frequent, this is due to the secretion of sex hormones in pigeons due to a strong, so people could help strengthen dove as Yang, invigorating kidney qi, arguing that it has a strong function. Pigeon eggs effect is better than the pigeon meat pigeon eggs, according to the determination and the dove meat, rich in protein, vitamins and iron and other elements, its high nutritional value.

Mobile IP

Mobile IP is designed to meet the needs of mobile node in mobile maintains its connectivity and design. Mobile IP now has two versions, respectively ( RFC 3344, Mobile IPv4 replaced RFC 3220, RFC 2002 ) and Mobile IPv6 ( RFC 3775 ). Use extensively at present is still Mobile IPv4

Definition

Stated most simply, mobile IP technology is to make the computer on the Internet and local area network without any restriction on real-time roaming, mobile computer technology.

A bit more professional explanation, mobile IP technology is a mobile node ( Computer / server / network etc.) with a fixed IP address, implementation spans different network roaming function, and ensure the network based IP network access in the roaming process without any change.

Mobile IP network roaming function

Mobile IP is applied to all based on TCP / IP network environment, it gives people unlimited network roaming service. For example: when the user leaves the Beijing Corporation, on a business trip to Shanghai branch, simply the mobile node ( for example: notebook computers, PDA devices ) connected to the Shanghai branch network, then the user can enjoy with head office in Beijing as well as all operations. The user can still use the Beijing company shared printer, or you can still visit Beijing Corporation colleagues computer share files and related database resources and so on; a variety of operations, lets the user feel myself in the field, colleagues feel you have to travel to the field. In other words: mobile IP applications allow users to "home " network everywhere can be" home", no longer endure the mobile node for" travel" and bring all the discomfort.

Key technology of mobile IP

The agents search: is the calculation of node to determine if they are roaming in the state.

Address: is a mobile node moves to the outside network from outside the agency get temporary address.

Login: is a mobile node to the outside network a series of certification, registration, establish tunneling process.

Tunnel: is the home agent and foreign agent between the temporary established bidirectional data channel.

Visual Search

The United States of America Microsoft" will be" the search engine has started trying to launch a " visual search " feature, through the picture to help users more convenient to perform specific search task

Sleep search - Demo

Microsoft senior vice president Mahdi in September 14, 2009 in San Francisco at a technology conference demonstrates" visual search " mode of operation. Users do not have to be directly input words, can be arranged through the picture library search. Still in the testing phase of" visual search" page has entertainment, celebrity, reference information, shopping and sports such as the 5 major categories of gallery, below them are further divided into nearly 40 picture library, such as shopping category using the icon into mobile phone, digital camera, high-definition TV and car etc..

Search engine technology

Visual search, by Bing search engine ( Bing ) launched a new search function, to Microsoft Silverlight technology as the support, in the interaction picture library display of search results.

New functionality is only aimed at 50 specific search results ( the future will continue to increase), such as a digital camera, a new car, major league players, and pop songs, with beautiful Silverlight driver fly-in thumbnail image. If you define your search request, do not meet the new definition of the thumbnail will fly out of the screen, while others rearrange to fill the vacated positions. Search results are also connected to other Bing search results page and the small procedures, such as shopping webpage and athletes' performance statistics.

For example, if the user input words, it will be a grid picture of the way to organize the search results, the user can drag the slider to scroll; when the user moves the mouse stays in a picture, the corresponding name in the search box. In addition, users can press the picture size, tolerance, reordering.

Will have 100 a variety of visual Gallery, ranging from movies, books, cars to products, animal and sports team and many other fields, classified in the category of each will change. In the movie as an example, the user can press the release date, title or scoring conditions can pass through the filter; automotive manufacturers, price or mileage classification. When the user makes a classification, picture on the screen and to find a new location.

The Visual Search function shows the search engine will structural information into their search results to the true value.

Microsoft senior vice president Joseph Mahdi ( Yusuf Mehdi ) said:" the function of the whole concept is to search the world will change, people will be more the image of the way to search for".

The development of visual search

In order to identify the images, search through the visual features, to provide users with the Internet search image data retrieval services of professional search engine, search engine is a kind of subdivision.

The emergence of many in order to identify the images of the search engine, including Baidu Baidu identify the images, Antu seized the shopping search engine, Google to map and so on.

Worthy of a woman eat life food

1: also known as cauliflower cauliflower, broccoli, containing a large amount of enzyme, Yishou Yannian anticancer, is the preferred food food. In addition, cauliflower also contains calcium, can prevent osteoporosis women often lack of iron and folic acid is beneficial for pregnant women.

2 strawberry: can improve the skin, relieve diarrhea, remission of liver and urethral diseases. At the same time, strawberry can also consolidate gum, fresh breath, moistening throat.

3 soy phytoestrogen content: is the food with the highest one, on women's health is very important.

4 sweet potato: rich in fiber, potassium, iron and vitamin B6, not only can prevent aging, but also the prevention of arteriosclerosis.