摘要:
PROBLEM TO BE SOLVED: To provide a plurality of data services by employing a plurality of chains of a plurality of redundant data containers which can be divided, merged and transferred. SOLUTION: A plurality of data blocks 704 and 708 are distributed to a plurality of different data containers 716 positioned in a plurality of different physical storage nodes in a node network, and stored in a plurality of fragments which can be automatically divided and/or merged according to the configuration of a storage node network, and which is distributed over a plurality of different storage nodes and which is erasure-encoded. Data service which is provided in a distributed secondary storage system utilizing the plurality of redundant chains of the plurality of containers can include global redundancy removal, dynamic scalability, support of a plurality of redundant classes, detection of the position of data, high-speed reading and writing of data, and reconstruction of data due to a failure of the node or a disk. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To generate e.g., over 100 Gbit/s orthogonal frequency division multiplexing (OFDM) optical signals with the limited bandwidth allowed for A/D and D/A converter. SOLUTION: A method for OFDM optical signal generation includes modulating lightwaves to provide first and second OFDM signal sidebands of a first polarization direction and first and second OFDM signal sidebands of a second polarization direction, and combining sidebands that are oppositely positioned in relation to the respective polarization directions and joined from the first and second OFDM signal sidebands at each polarization direction to provide a polarization multiplexing OFDM signal. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an orthogonal frequency division multiple access based upon virtual passive optical network (VPON). SOLUTION: Various types of passive optical networks operate simultaneously in a passive optical network system having an optical line terminal, a passive remote node, and a plurality of multiple optical network devices. Downstream data are orthogonal frequency division multiplexed onto a single wavelength optical carrier transmitted on a first downstream optical beam from the optical line terminal to a splitter in the passive remote node. The first downstream optical beam is divided into a plurality of second downstream optical beams to be transmitted to a specific optical network device. Upstream data are orthogonal frequency division multiplexed onto a single wavelength optical carrier transmitted on a second upstream optical beam from each optical network device to a coupler in the passive remote node. The upstream wavelength for each optical network device is different. The wavelength division multiplexed optical beam is transmitted from the passive remote node to a parallel signal detector in the optical line terminal. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a transmitter including a plurality of encoders for coded modulation. SOLUTION: A transmitter includes a plurality of encoders configured to receive source bit streams from (m) information sources, each of the plurality of encoders including identical (n, k) low-density parity check (LDPC) codes of code rate r=k/n, where (k) is a number of information bits and (n) is codeword length. An interleaver is configured to collect (m) row-wise codewords from the plurality of encoders, and a mapper is configured to receive (m) bits at a time column-wise from the interleaver and to determine an M-ary signal constellation point. A modulator is configured to modulate a light source in accordance with the output of the mapper at a transmission rate R s /r (R s is the symbol rate, (r) is the code rate). A receiver and transmission and receiving methods are also disclosed. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To produce a broad band width optical channel which has high spectral efficiency, a high dispersion allowable range and functions at 100 Gbit/sec or more. SOLUTION: A production method includes processes of: producing, from an optical source, at least two optical carriers with a constant wavelength interval; producing an upper side sub-channel and a lower side sub-channel which are orthogonal to each other and are mutually separated based on a wavelength interval generated by the modulation of the optical carrier, depending on OFDM signals which are suppressed in their carrier waves and are up-converted; and combining one optical wave from the upper sub-channel and one optical wave from the lower sub-channel into an optical channel for transmission over an optical fiber. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To statically analyze a program by using abstract interpretation for an analysis sensitive to a path using an analysis insensitive to a path. SOLUTION: A system and a method for infeasible path detection include performing a static analysis on a program to prove a property of the program. If the property is not proved, infeasible paths in the program are determined by performing a path-insensitive abstract interpretation. Information about such infeasible paths is used to achieve the effects of path-sensitivity in path-insensitive program analysis. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To achieve the reduction of bogus warnings which exceeds the reduction of the bogus warnings obtained by using synchronization constraints. SOLUTION: A system and method for program verification includes generating a product transaction graph for a concurrent program, which captures warnings for potential errors. The warnings are filtered to remove bogus warnings, by using constraints from synchronization primitives and invariants that are derived by performing one or more dataflow analysis methods for concurrent programs. The dataflow analysis methods are applied in order of overhead expense. Concrete execution traces are generated for remaining warnings using model checking. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a method and apparatus for scheduling heterogeneous traffic in B3G/4G cellular networks. SOLUTION: A method includes tracking average user throughput or the like for every user that is serviced; determining a potential schedule set responsive to user requirements responsive to minimum rate guarantee for data flows and maximum tolerable delay and jitter guarantees for voice flows; with multiple flows for each user, first determining contending flow for each user responsive to aggregate rate feedback; obtaining search space for the user requirements of rate, delay and jitter responsive to corresponding optimizing strategies; determining individual rate, delay and jitter related schedules providing maximum incremental or marginal utility; and calculating final schedule of users on channels providing maximum incremental or marginal utility among parameter specific schedules from the determining step. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide test data compression method applicable to System-on Chip (SoC) which can attain maximum compression, while shortening the test run time. SOLUTION: The test data compression method comprises a step for acquiring equivalent core of plural cores in the System-on Chip circuit, and a step for applying reseeding of linear feedback shift register (LFSR) for test data compression of the equivalent core. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a data replication technique for providing erasure encoded replication of large data sets over a geographically distributed replica set. SOLUTION: The technique utilizes a multicast tree to store, forward, and erasure encode the data set. The erasure encoding of data may be performed at various locations within the multicast tree, including the source, intermediate nodes, and destination nodes. In one embodiment, the system comprises a source node for storing the original data set, a plurality of intermediate nodes, and a plurality of leaf nodes for storing the unique replica fragments. The nodes are configured as a multicast tree to convert the original data into the unique replica fragments by performing distributed erasure encoding at a plurality of levels of the multicast tree. COPYRIGHT: (C)2007,JPO&INPIT