Abstract: An apparatus has a plurality of transmitters for transmitting optical packet signals having wavelengths; a multiplexer for multiplexing the optical packet signals transmitted by the plurality of transmitters; a packet scheduler controlling a timing at which each of the transmitters transmits the optical packet signal; and an assister for controlling power of assist light in accordance with a signal from the packet scheduler and causing the assist light to be wavelength-multiplexed with the wavelength multiplexed light such that a total sum of power of the wavelength multiplexed light and the power of the assist light is held constant under a predetermined condition.

Abstract: A large data transmission method in a sensor network based on a media access control (MAC) is provided. The method includes dividing data to be transferred into a plurality of data segments; generating a plurality of media access control (MAC) segmented data frames by including in each data segment an indication that the data is generated by segmentation and assigning a sequence number to the data segment; transmitting the generated MAC segmented data frames sequentially; receiving a MAC reception failure frame indicating reception failure for a predetermined period of time from a receiving sensor node after completing the transmitting of all the MAC segmented data frames; and retransmitting the MAC segmented data frames which correspond to at least one sequence number included in the received MAC reception failure frame. Accordingly, large data transmission times can be reduced in a MAC for a sensor network.

Abstract: An optical transmission apparatus including a transmitting OTL processor to rearrange a data string stored in a frame into a plurality of logical lanes, and set a lane ID used to identify in which logical lane a beginning of the data string is arranged among the plurality of logical lanes in a non-scramble area in an overhead of the frame, and a receiving OTL processor to respectively identify the lane IDs included in the data string in the respective physical lanes rearranged, determine a generation state of a bit inversion and a lane replacement for each physical lane, compensate the bit inversion and the lane replacement so that the data string in the respective physical lanes becomes same state as the data string in the respective logical lanes, based on the identified result, and rearrange the compensated data string in the respective logical lanes so as to regenerate the frame.

Abstract: A computer-readable medium encoded with an instruction check program for making a computer to check a status of execution of an instruction by an I/O simulator that performs an operation simulation according to a structure of an I/O area of a microcomputer, the instruction check program when executed by a computer causes the computer to perform a method including obtaining specification information of the microcomputer describing an input and an output condition of a hardware resource in the I/O area, detecting a simulation of a reference instruction to the hardware resource executed by the I/O simulator, determining correctness of the reference instruction by comparing a content of the simulation of the reference instruction detected by the detecting with the input and output condition of the hardware resource included in the obtained specification information, and outputting an error signal when it is determined that the reference instruction is incorrect.

Abstract: A robot vision system for outputting a disparity map includes a stereo camera for receiving left and right images and outputting a disparity map between the two images; an encoder for encoding either the left image or the right image into a motion compensation-based video bit-stream; and a decoder for extracting an encoding type of an image block, a motion vector, and a DCT coefficient from the video bit-stream. Further, the system includes a person detector for detecting and labeling person blocks in the image using the disparity map between the left image and the right image, the block encoding type, and the motion vector, and detecting a distance from the labeled person to the camera; and an obstacle detector for detecting a closer obstacle than the person using the block encoding type, the motion vector, and the DCT coefficient extracted from the video bit-stream, and the disparity map.

Abstract: A Viterbi decoder includes: an observation vector sequence generator for generating an observation vector sequence by converting an input speech to a sequence of observation vectors; a local optimal state calculator for obtaining a partial state sequence having a maximum similarity up to a current observation vector as an optimal state; an observation probability calculator for obtaining, as a current observation probability, a probability for observing the current observation vector in the optimal state; a buffer for storing therein a specific number of previous observation probabilities; a non-linear filter for calculating a filtered probability by using the previous observation probabilities stored in the buffer and the current observation probability; and a maximum likelihood calculator for calculating a partial maximum likelihood by using the filtered probability.

Abstract: This invention provides a plasma tube array-type display device and a luminance correcting method realizing reduced variations in luminance values of a plasma tube array. A gradient of the luminance value in the longitudinal direction of one plasma tube is calculated on the basis of the obtained luminance value at a plurality of positions in the longitudinal direction of at least one plasma tube. A difference of the luminance value of each plasma tube obtained at the same relative position. On the basis of the gradient of the luminance value and the difference of the luminance value of each plasma tube at the same relative position, a correction luminance value in each discharge cell in the longitudinal direction of each of the plurality of plasma tubes is calculated.

Abstract: A library apparatus includes a robot which transports a transportable medium, an objective unit including a light receptor of the objective unit and a light emitter of the objective unit which emits light to the outside of the objective unit when light is received by the light receptor of the objective unit. The robot includes a light emitter of the robot opposite to the light receptor of the objective unit that emits light to the light receptor of the objective unit at the time of positioning of the robot at the objective unit, and a light receptor of the robot opposite to the light emitter of the objective unit that receives light from the light emitter of the objective unit at the time of positioning of the robot at the objective unit.

Abstract: The optical switch is capable of supervising the performance of optical switching in standby channels, and includes: a collimator unit; an optical splitter; a light-gathering unit; and a rotatable mirror. The optical switch further includes: a mirror angle controlling unit which controls a reflection face angle of the rotatable mirror for each wavelength to switch ON/OFF of the light beam coupling to the optical output port for each wavelength reflected, and determines an optical output port position outputting light beams of the reflected wavelengths; and a monitor unit, installed on a return path of a light beam, which monitors a light beam whose optical coupling is made OFF.

Abstract: An OADM in a wavelength division multiplexing transmission system includes a wavelength selection switch that selects a predetermined wavelength from a multiple optical signal obtained by multiplexing a phase modulated signal and an intensity modulated signal and outputs the selected wavelength signal to a predetermined output port. The wavelength selection switch has a different delay for each wavelength of the multiple optical signal. For example, the wavelength selection switch includes a mirror array. Optical paths from the surfaces of mirrors arranged on the mirror array to the diffraction grating are different in the case of adjacent mirrors.

Abstract: An information processing system including a computer and a mobile terminal that can communicate with the computer in a predetermined area is disclosed. In the information processing system, the computer sends code to the mobile terminal, the mobile terminal encrypts user information using the code sent from the computer, and sends the encrypted user information to the computer, the computer decodes the encrypted user information sent from the mobile terminal using the code, and compares the decoded information with user information that is registered beforehand. Then, when the decoded user information is the same as the user information that is registered, the computer permits access to the computer, but when the decoded information is not the same as the user information that is registered, the computer prohibits access to the computer.

Abstract: The present invention relates to a phase recovery device, phase recovery method and receiver for 16 QAM data modulation.

Abstract: An apparatus for performing fault tolerance against a failure occurring during driving robot software components includes: a component executor for executing the robot software components, which are assigned with one thread from an operating system and have a same priority and cycle, by using the assigned thread; and an executor monitor for periodically monitoring the operation of the component executor and determining whether or not there is a failure in the robot software components executed by the component executor. The apparatus further includes: an executor manager for generating the component executor which is assigned with the robot software components having the same priority and cycle and, when the executor monitor determines that there is a failure in the execution of the robot software components, generating a new component executor.

Abstract: Disclosed is a refrigerator including a main body cabinet forming a storage compartment including a front opening, and a drawer type door entering and exiting the storage compartment to open and close the front opening, the drawer type door including: a basket entering and exiting the storage compartment; a door main body coupled to a front area of the basket to open and close the front opening of the storage compartment; a pocket unit formed at an upper wall surface of the door main body to receive a user's hand; a handle member adjacent to the pocket unit to rotate in forward and backward directions with respect to the door main body; and a pair of sliders reciprocating between an opening position and a closing position.

Abstract: A test pattern generating device generates a test pattern with respect to a semiconductor circuit having first and second common circuits and a non-common circuit, wherein each of the common circuits has a scan chain for checking an operation of the circuit by applying a test pattern from the outside of the circuit. A set of scan chains and a set of assumed faults are created for each of the common circuits. Any of the common circuits is determined as the common circuit of a first test target. After the determined common circuit of the first test target is subjected to ATPG and detection of circuit fault, a test pattern generated in successful ATPG about the common circuit of the first test target is diverted to the common circuit determined as the second test target, and ATPG and detection of a circuit fault of the non-common circuit part.

Abstract: Communication networks are automatically tested from a superordinate producer-independently managing network management center, such as when subordinate, producer-specific operation and maintenance centers (OMCs) are not occupied. Producer-dependent information is transmitted when an alarm report is sent and producer-specific hardware tests are automatically generated in the network management center (NMC). It is unnecessary for producer-specific object classes to be completely defined in the information model of the OMC-NMC interface. The tests automatically generated in the network management center can be triggered in response to errors, e.g. for a particular hardware board, or preventively, for example for the entire hardware of a network unit.

Abstract: A method and apparatus for tracking a listener's head position for virtual stereo acoustics. The method of tracking the head position of a listener includes: obtaining face images of the listener using two image pickup units; tracking the skin color of an image, thereby obtaining the two-dimensional (2D) coordinate value of the listener's position; and obtaining the distance between the image pickup units and the listener using triangulation.

Abstract: A digital coherent optical receiver provided with a 90-degree optical hybrid circuit for detecting an in-phase signal and a quadrature signal of an input optical signal, includes first through fourth circuits. The first circuit calculates a square of a sum of the in-phase signal and the quadrature signal. The second circuit subtracts a squared value of the in-phase signal and a squared value of the quadrature signal from the calculation result of the first circuit. The third circuit detects a phase error of the 90-degree optical hybrid circuit based on the calculation result of the second circuit. The fourth circuit corrects at least one of the in-phase signal and the quadrature signal according to the phase error detected by the third circuit.

Abstract: Even during a protection period in which a state transition is not caused from an ALC state to an ALD state, when an output light level that is inputted is below a threshold for ALC transition read from a memory, a processor causes a transition by switching an internal state from an ALC state to an ALD state. Then, an ALD operation is started, outputting a control voltage to a VAT control unit so as to achieve a predetermined fixed attenuation amount.