1. A method for discovering a node in a wireless self-organized network, comprising the steps of:
determining, by nodes in the network, a unified node discovery channel based on unified information provided by a trusted third party; and
finding the node based on the unified node discovery channel.
2. The method for discovering a node according to claim 1,
wherein the network is a wireless self-organized network of which an area is limited, the unified information is an area encryption key, and the area encryption key includes an area number.
3. The method for discovering a node according to claim 2,
wherein the step of determining the unified node discovery channel based on the unified information provided by the trusted third party, comprises the steps of
performing a modulo computation for the area number by the number of available channels in the network, and
setting a result of the modulo computation as a serial number, and setting a channel within a list of the available channels corresponding to the serial number as the unified node discovery channel.
4. The method for discovering a node according to claim 2,
wherein the area encryption key further includes an indicator for indicating an allowable degree of channel interference.
5. The method for discovering a node according to claim 4,
wherein the step of determining the unified node discovery channel based on the unified information provided by the trusted third party, further comprises the steps of
determining, for each of a plurality of available channels in the network, whether an interference condition of the channel is superior to the allowable degree indicated by the indicator or not, and
determining that the channel is the available channel if it is determined that the interference condition is superior to the allowable degree indicated by the indicator, otherwise setting the channel as an unavailable channel.
6. The method for discovering a node according to claim 2,
wherein the step of finding the node based on the unified node discovery channel, comprises the step of performing a listen operation and a search operation in the unified node discovery channel.
7. The method for discovering a node according to claim 6,
wherein the area encryption key further includes a random encryption key and a counter value.
8. The method for discovering a node according to claim 7,
wherein the step of performing the listen operation and the search operation in the unified node discovery channel, comprises the steps of
by a node for search, encrypting both of the area number and the counter value based on the random encryption key, adding the encrypted area number and the counter value into a probe request message, and sending the probe request message in the unified node discovery channel,
by a node for listen, decrypting the encrypted area number and counter value in the received probe request message, and performing a predetermined operation process for the decrypted counter value, encrypting the area number and the counter value after the operation process by a random encryption key of the node for listen, adding the encrypted area number and counter value into a probe response message and sending the probe response message to the node for search via the node discovery channel when the decrypted area number and an area number of the node for listen are matched, and
by the node for search, decrypting the encrypted area number and counter value in the received probe response message, performing an inverse operation of the operation process for the decrypted counter value, and determining that the node is discovered when the decrypted area number and the area number of the node for search are matched and the counter value after the inverse operation and the counter value of the node for search are the same.
9. The method for discovering a node according to claim 2, further comprising the step of
by the nodes in the network, broadcasting a probe request message in available channels of the network so as to scan other nodes in the network, and receiving only probe response messages for the probe request message that are returned from nodes having the unified information, before determining the unified node discovery channel based on the unified information provided by the trusted third party.
10. An apparatus for discovering a node in a wireless self-organized network, comprising:
a determination unit configured to determine a unified node discovery channel based on unified information provided by a trusted third party; and
a finding unit configured to find the node on the unified node discovery channel.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for producing a lubricant base oil from a waxy hydrocarbon feed, the method comprising:
a) on-stream sulfiding a shape selective, intermediate pore size, noble metal-containing molecular sieve catalyst to provide a sulfided catalyst; and
b) hydroisomerizing the waxy hydrocarbon feed by contacting the waxy hydrocarbon feed with the sulfided catalyst at hydroisomerization conditions, to produce a lubricant base oil.
2. The method of claim 1, wherein the waxy feed is selected from the group consisting of gas oil, lubricating oil stock, synthetic oil, Fischer-Tropsch derived wax, oligomerized Fischer-Tropsch derived olefins, foots oil, slack wax, de-oiled wax, normal alpha olefin wax, microcrystalline wax, and mixtures thereof.
3. The method of claim 2, wherein the hydrocarbon waxy feed is a Fischer-Tropsch derived wax.
4. The method of claim 1, wherein the molecular sieve has channel diameters in the range of from about 4.0 to 7.1 \u212b.
5. The method of claim 1, wherein the molecular sieve is non-zeolitic.
6. The method of claim 5, wherein the catalyst is a SAPO catalyst.
7. The method of claim 6, wherein the SAPO catalyst is selected from the group consisting of SAPO-11, SAPO-31, and SAPO-41.
8. The method of claim 1, wherein the noble metal is selected from the group consisting of platinum, palladium, and mixtures thereof.
9. The method of claim 1, wherein the on-stream sulfiding comprises contacting the catalyst with a sulfur-containing species in the presence of hydrogen, the sulfur-containing species selected from the group consisting of hydrogen sulfide, carbon disulfide, and a mercaptan.
10. The method of claim 9, wherein the waxy hydrocarbon feed contains less than about 10 ppm sulfur.
11. The method of claim 1, wherein on-stream sulfiding comprises contacting the catalyst with a sulfur spiked waxy hydrocarbon feed.
12. The method of claim 1, wherein the hydroisomerization conditions include a total pressure of between about 150 and 1,000 psig.
13. The method of claim 12, wherein the hydroisomerization conditions include a total pressure of between about 150 and 500 psig.
14. The method of claim 13, wherein the hydroisomerization conditions include a total pressure of between about 150 and 300 psig.
15. The method of claim 12, wherein the hydroisomerization conditions include a total pressure of between about 500 and 1,000 psig.
16. The method of claim 1, wherein between about 40 and 95 weight percent of the lubricant base oil has a boiling point of between about 650 and 1400\xb0 F.
17. The method of claim 1, wherein the lubricant base oil has a viscosity index between about 140 and 190.
18. The method of claim 1, wherein the lubricant base oil has a pour point between about \u22125 and \u221260\xb0 C.
19. The method of claim 1, wherein the lubricant base oil has a viscosity at 100\xb0 C. of greater than 3 cSt.
20. The method of claim 1, further comprising solvent dewaxing at least a portion of the lubricant base oil, thereby removing a slack wax.
21. The method of claim 20, further comprising hydroisomerizing the slack wax with the waxy hydrocarbon feed.
22. The method of claim 1, further comprising re-sulfiding the sulfided catalyst.
23. A method for producing a lubricant base oil from a waxy hydrocarbon feed, the method comprising:
a) pre-sulfiding a shape selective, intermediate pore size, noble metal-containing molecular sieve catalyst to provide a sulfided catalyst;
b) contacting the waxy hydrocarbon feed with the sulfided catalyst at hydroisomerization conditions;
c) re-sulfiding the sulfided catalyst; and
d) isolating a lubricant base oil.
24. The method of claim 23, wherein the waxy hydrocarbon feed is a Fischer-Tropsch derived wax.
25. The method of claim 23, wherein the lubricant base oil has a pour point between about \u22125 and \u221260\xb0 C. and a viscosity at 100\xb0 C. of greater than 3 cSt.