Abstract: Provided is a method of generating a magnetic field map including obtaining magnetic field information, the magnetic field information being information on a magnetic field affecting a mobile body, for each position of the mobile body, and building a magnetic field map based on the magnetic field information for each position of the mobile body. The pose of a mobile body can be statistically checked by the probability obtained using the difference between the magnetic field information observed from the magnetic field map and the actually measured magnetic field information. Although the pose of the mobile body is estimated using a camera that is sensitive to an illumination state where the mobile body is placed, the pose of the mobile body can be relatively accurately checked using the magnetic field map obtained in a situation regardless of illumination, with being less affected by the illumination state where the mobile body is placed. Thus, the pose of the mobile body can be checked with reliability.

Abstract: There are provided a method and apparatus for determining a geomagnetic field by using a compass and a method and apparatus for determining an azimuth angle of a moving object using the method and apparatus for determining a geomagnetic field. The method of determining a geomagnetic field by using a compass includes defining an allowable magnetic field range used to determine a valid geomagnetic region; calculating a magnitude of a magnetic field in a geomagnetic-field validity test region by using a compass; and if the magnitude of the magnetic field is within the allowable magnetic field range, determining that the geomagnetic-field validity test region is the valid geomagnetic region, and if not, determining that there is applied an external magnetic field disturbance. Accordingly, since an error of an azimuth angle of the compass due to an external magnetic field disturbance can be determined, it is possible to accurately detect a valid azimuth angle of the compass.

Abstract: Provided are an apparatus and method of calibrating azimuth of a mobile device. The apparatus includes: a magnetic field measuring unit having a plurality of magnetic sensors aligned in a constant angle interval on the mobile device and measuring magnetic field data indicating magnitudes of a magnetic field in different directions; and a controller generating a calibration table indicating a correspondence between an actual magnetic field trajectory formed by the magnetic field data and a theoretical magnetic field trajectory and calibrating azimuth of the mobile device using the calibration table.

Abstract: Provided are an apparatus and method of calibrating azimuth of a mobile device. The apparatus includes: a motor; a magnetic field measuring unit disposed in the mobile device and measuring magnetic field data indicating magnitudes of a magnetic field in different directions while being rotated by the motor; and a controller driving the motor, generating a calibration table indicating a correspondence between an actual magnetic field trajectory formed by the magnetic field data and a theoretical magnetic field trajectory and calibrating azimuth of the mobile device using the calibration table.

Abstract: A semiconductor memory device having a number of banks, reduces circuit area of a Y controlling unit for decoding a column address. The circuit area for a circuit block for decoding the column address in the memory device can be significantly reduced so that the memory device can be integrated even highly. The semiconductor memory device1 includes a first bank and a second bank, a pre-decoder for pre-decoding a column address, a first main decoder for decoding the output signal from the pre-decoder to select a bit line of the first bank, and a second main decoder for decoding the output signal from the pre-decoder to select a bit line of the second bank.

Abstract: Provided is a method of using a rotational movement amount of a mobile device including obtaining images at two different points on a path along which the mobile device moves, searching for matching points with respect to the obtained images and obtaining an image coordinate value of each of the matching points, sensing linear movement of the mobile device and obtaining a linear movement amount using a result of sensing, and obtaining the rotational movement amount using the image coordinate values and the linear movement amount.

Abstract: Provided a method and apparatus for using a magnetic field. The method includes: measuring and storing magnetic field data indicating magnitudes of a magnetic field in different directions at each time by rotating sensors over a space; and checking whether a disturbance of the magnetic field exists, using curve fitting parameters such as amplitude and offset of at least one of magnetic field trajectories formed by the stored magnetic field data.

Abstract: A motion estimation method and system for a mobile body are provided. The method includes: obtaining magnetic field information from compass information of the mobile body; comparing the magnetic field of the mobile body with a predetermined value and determining whether a position of the mobile body belongs to a specific region according to the comparison result; and estimating a direction of the mobile body by determining whether a compass azimuth angle is used for direction estimation of the mobile body according to the determination result.

Abstract: A landmark detection apparatus and method, the apparatus including a first detection unit that generates N first sample blocks in a first sampling region using a first weighted sampling method according to a first degree of dispersion, and that performs a first landmark detection by comparing a feature of each first sample block a feature of a landmark model, where the first sample region is set to the entirety of a current frame image; and a second detection unit that generates N second sample blocks in a second sampling region using a second weighted sampling method according to a second degree of dispersion, and that performs a second landmark detection by comparing a feature of each second sample block the feature of the landmark model, where the second sampling region is set to an area less than the entirety of the current frame image.

Abstract: An improved fire extinguisher comprises a cylindrical shell, a head element attached to the top end of the cylindrical shell and having a path formed therein, and a discharge hose coupled to the head element to communicate with the head element, wherein the discharge hose is fixed to the cylindrical shell by means of a magnet formed on the discharge hose or the cylindrical shell. Therefore, the discharge hose can be fixed to the cylindrical shell and is separated from the cylindrical shell rapidly and easily.

Abstract: The present invention relates to a data pass control device for masking a ringing of a data strobe that occurs when a write operation in a DDR SDRAM is completed. The data pass control device for masking the write ringing in the DDR SDRAM can be advantageously used for masking only a section with the ringing problem during the write operation, so that any unnecessary operations during the write operation can be eliminated and a more stable write operation can be realized by eliminating a write fail.

Abstract: A data output control apparatus and method of a semiconductor memory device exactly synchronize the first read data with a clock signal by solving a problem that the first read data is faster than the clock signal as much as a transit time from a voltage level Vddq/2 to a power voltage Vddq or a ground voltage Vssq.

Abstract: A decoder circuit in a semiconductor memory device for improving the productivity of a semiconductor memory device by reducing the area occupied by a decoder. In order to accomplish this, a decoder circuit in a semiconductor memory device comprises a decoder control unit for receiving an external clock signal and a reset signal to generate a clear signal, an internal reset signal, a plurality of driver enable signals and a plurality of shift register enable signals; and a plurality of decoders for decoding the clear signal, the internal reset signal, the plurality of driver enable signals and the plurality of shift register enable signals to generate a plurality of wordline-driving signals.

Abstract: A decoder circuit in a semiconductor memory device for improving the productivity of a semiconductor memory device by reducing the area occupied by a decoder. In order to accomplish this, a decoder circuit in a semiconductor memory device comprises a decoder control unit for receiving an external clock signal and a reset signal to generate a clear signal, an internal reset signal, a plurality of driver enable signals and a plurality of shift register enable signals; and a plurality of decoders for decoding the clear signal, the internal reset signal, the plurality of driver enable signals and the plurality of shift register enable signals to generate a plurality of wordline-driving signals.

Abstract: A parallel test circuit for a semiconductor memory device includes a divided output driver configuration capable of generating a tri-state output. The parallel test circuit has a main output driver for outputting a signal having a first level when cell arrays are stored with data having the same level, and a sub output driver for outputting a signal having an intermediate level when the cell arrays are stored with data having different levels. Because the parallel test circuit can accurately detect errors, it can perform a reliable parallel test for pass/fail devices, and can be used to check device characteristics or for a speed sort test.

Abstract: A pipe register for use in a semiconductor memory device, wherein said semiconductor memory device includes global input/output (I/O) lines, complementary global I/O lines, and pipe registers, coupled to said global I/O lines and said complementary global I/O lines, for detecting the data loaded on said global I/O lines and complementary global I/O lines to store the data, includes: a data detecting unit, coupled to said global I/O lines and complementary global I/O lines, for detecting whether the data is loaded on said global I/O lines and complementary global I/O lines; a control signal generating unit for sensing edges of the data loaded on the global I/O line and the complementary global I/O line to generate a rising edge sensing signal and a falling edge sensing signal; and a plurality of storage units for storing the data loaded on said global I/O lines and said complementary global I/O lines in response to a reset signal, the falling edge sensing signal and the rising edge sensing signal and for outpu

Abstract: A synchronous semiconductor memory device having a plurality of external signal input buffer and a plurality of latch circuits, includes: a clock buffer for receiving an external clock signal to generate a buffered clock signal; a chip select buffer for receiving an external chip select signal and the buffered clock signal from said clock buffer to generate a buffered chip select signal, an inverted buffered chip select signal and a latch control signal, wherein the latch control signal is activated when the external clock signal is at the rising edge and the external chip select signal is low; a plurality of external signal buffers for receiving external signals to generate buffered signals and inverted buffered signals; and a plurality of latch circuits for latching and outputting the buffered signals and the inverted buffer signals to an internal logic circuit in response to the latch control signal.

Abstract: In semiconductor memory device including a sense amplifier, the sense amplifier includes a bit line and a bit line bar coupled to the memory cell, a data line and an inverting data lines for transferring an output of the sense amplifier, a first P-type MOS/BIPOLAR composite transistor having a source/emitter coupled to a first level potential, a gate/base coupled to the inverting data line and a drain/collector coupled to the data line, a second P-type MOS/BIPOLAR composite transistor having a source/emitter coupled to the first level potential, a gate/base coupled to the data line and a drain/collector coupled to the inverting data line, a first N-type MOS/BIPOLAR composite transistor having a drain/collector coupled to the data line and a gate/base coupled to the inverting data line, a second N-type MOS/BIPOLAR composite transistor having a drain/collector coupled to the inverting data line and a gate/base coupled to the data line, a first load coupled between a source/emitter of the first N-type MOS/BIPOLA