摘要:
A statistical transition map is built based on mobile wireless device user mobility history data. This data is useful to assist various wireless local area network applications. Received signal strength and location trace information associated with movements of mobile wireless devices in a wireless network is collected. The received signal strength and location trace information is converted to a sequence of natural language pseudo-location word labels representing pseudo-locations of each mobile wireless device as each mobile wireless device moves about with respect to a plurality of wireless access point devices in the wireless network. A statistical transition map is generated for each mobile wireless device from the sequence of natural language pseudo-location word labels using a natural language model. A probability of a next pseudo-location for a particular mobile wireless device is computed based on its current location and its statistical transition map.
摘要:
Methods for synthesizing Salacinol, its stereoisomers, and analogues, homologues and other derivatives thereof potentially useful as glycosidase inhibitors. In some embodiments the compounds of the invention may have the general formula (I) or (II): The synthetic schemes may comprise reacting a cyclic sulfate with a 5-membered ring sugar containing a heteroatom (X). The heteroatom preferably comprises sulfur, selenium, or nitrogen. The cyclic sulfate and ring sugar reagents may be readily prepared from carbohydrate precursors, such as D-glucose, L-glucose, D-xylose and L-xylose. The target compounds are prepared by opening of the cyclic sulfates by nucleophilic attack of the heteroatoms on the 5-membered ring sugars. The resulting heterocyclic compounds have a stable, inner salt structure comprising a heteroatom cation and a sulfate anion. The synthetic schemes yield various stereoisomers of the target compounds.
摘要:
Aspects of the present disclosure relate to a current multiplier that can generate an output current with high linearity and/or high temperature compensation. Such current multipliers can be implemented by complementary metal oxide semiconductor (CMOS) circuit elements. In one embodiment, the current multiplier can include a current divider and a core current multiplier. The current divider can generate a divided current by dividing an input current by an adjustable division ratio. The division ratio can be adjusted, for example, based on a comparison of the input current with a reference current. The core current multiplier can generate the output current based on multiplying the divided current and a different current. According to certain embodiments, the output current can be maintained within a predetermined range as the input current to the current divider varies within a relatively wide range.
摘要:
Biocompatible, bioerodible implants and microspheres include latanoprost and a biodegradable polymer effective, when placed intraocular (such as into the subtenon space) to treat glaucoma.
摘要:
A method and system for achieving data de-duplication on a block-level storage virtualization device belonging to the field of data storage technologies, is disclosed. The method comprises: deleting the duplicate data in the actual physical data corresponding to the specified virtual LBA address space to obtain the data extents after physical data is de-duplicated; establishing the correspondence between the virtual LBA address space and the data extents after the physical data is de-duplicated; according to the correspondence and metadata information of the data extents, obtaining the storage position information of the actual physical data corresponding to the virtual LBA address space pointed by external data read and write requests to complete the I/O redirection. This invention also provides a system for achieving data de-duplication on a block-level storage virtualization device. This invention can delete duplicate data across hosts and storage devices, to achieve a wider scope of data de-duplication.
摘要:
A voltage converter can be switched among two or more modes to produce an output voltage tracking a reference voltage that can be of an intermediate level between discrete levels corresponding to the modes. One or more voltages generated from a power supply voltage, such as a battery voltage, can be compared with the reference voltage to determine whether to adjust the mode. The reference voltage can be independent of the power supply voltage.
摘要:
The present application relates to cloud storage technology and especially relates to a cloud storage data store and retrieval method, apparatus and system. The data storing method comprise grouping source data to be stored according to a predetermined grouping rule; reorganizing the content of the grouped source data to form new data; transmitting the new data to a cloud storage data center for storage. The data retrieval method comprises, as requested, retrieving the data from a cloud storage data center; acquiring data recovery information corresponding to the data; restoring the data to source data according to the data recovery information. This application also provides a cloud storage data storing and retrieving apparatus and system. This invention can improve the data security of cloud storage and mitigate the risk of user data illegal leak and decryption.
摘要:
The present application relates to cloud storage technology and especially relates to a cloud storage data access method, apparatus and system based on OTP. This method includes: generating and storing true random numbers of a predetermined length and a random seed of a predetermined length composed of the true random numbers via a preset method; acquiring data from the random seed for several times and cascading the data acquired each time into a true random data string of no shorter than the length of plaintext; based on the true random data string, generating a true random cryptographic key of no shorter than the length of the plaintext, encrypting the plaintext using this cryptographic key and transmitting ciphertext to a cloud storage data center. This application also provides a cloud storage data access apparatus and system based on OTP. The method, apparatus and system introduced by this invention can generate and store sufficient true random cryptographic key with relatively small physical space occupancy in comparison with that of plaintext, thereby enabling OTP to be applied into cloud storage data security protection.
摘要:
A voltage converter is switched among two or more modes to produce an output voltage matching a reference voltage that can be of an intermediate level between discrete levels corresponding to the modes. The output voltage is compared with the reference voltage to determine whether to adjust the mode.
摘要:
A current reference source circuit that is independent of power supply which is used for producing a current reference source that is independent of power supply, the circuit at least includes a resistor Rs and a mirror image circuit which is formed with four MOSs, M1, M2, M3, M4, there is another mirror circuit branch besides the mirror circuit, the current of the resistor Rs, the present invention modifies the traditional current reference source circuit that is independent of power supply, the derived current formula adds one adjustable parameter M, so as to make the design more flexible, so that when a very small reference current is required, it can be achieved by keeping the W/L of the NMOS and the resistor Rs, and simply increasing parameter M in the extra mirror circuit branch.