Abstract: A system for power saving in communication with a plurality of sensor apparatuses that are located in-body or on-body to sense bioinformation, a management apparatus that performs synchronization by transmitting a beacon signal to the plurality of sensors at each predetermined period, and a sensor apparatus that includes a sensor receiving a first beacon signal, grasps how much time remains until the second beacon signal is received when the sensor is activated to sense the bioinformation, and determines the operation state of the sensor based on the grasped time are provided.

Abstract: A transmission apparatus according to an exemplary embodiment of the present invention comprises a serial/parallel (S/P) converter for converting an input bit stream into a plurality of symbols each including 3 bits, a differential modulator for generating differential encoded symbols by applying ?/4 phase rotation to each of the symbols, up-samplers for up-sampling the differential encoded symbols, filters for filtering the up-sampled symbols, digital/analog (D/A) converters for converting the filtered symbols into analog signals, and a quadrature modulator for performing quadrature modulation on the converted analog signals.

Abstract: A block-coded group modulation method includes generating a symbol by grouping at least one bit of a data bit stream into one group, classifying the symbol into an n number of sections, and generating an n number of initial information bits. Next, the method includes setting up the size of a pulse corresponding to signal energy transmitted through each of the n sections, generating an additional information bit on the basis of the number of cases according to the sequence of the energy sizes, and generating final information bits by inserting the additional information bit into the initial information bits.

Abstract: Disclosed is an optical member for use in liquid crystal displays, which can correct the light path and can minimize the loss of light, so that light in a wider angular range can be collected forwards. Even when a distance between the optical member and a light source is shortened, the optical member can exhibit good hiding performance and prevent deformation caused by heat. Upon expansion and shrinkage, the optical member is not scratched and does not generate noise at a portion in contact with a support pin.

Abstract: Provided is a radio communication system for ultra wideband (UWB) impulse communications and a radio communication apparatus and method thereof. The present patent provides a radio communication system that can minimize power consumption by eliminating a need for carrier detection and sharing transmission/reception time information in UWB impulse communications. The system includes a network coordinator; and one or more devices communicating on a superframe basis in subordination to the network coordinator. The devices perform data transmission/reception in predetermined time slots and then they are inactivated to thereby reduce power consumption.

Abstract: A transmitter using a method of block code-based group modulation includes a grouping unit, a generating unit, and a mapping unit. The grouping unit generates symbols by grouping a data bit stream into N-bit groups, and the generating unit generates a codeword set composed of codewords corresponding to combinations of arrangements of pulses that are generated by a result of grouping to a predetermined number. Next, the mapping unit block-maps a codeword selected from the codeword set to groups constituting the symbols.

Abstract: Provided is a distance and position measuring method. A distance measuring method based on packets transmitted and received between a first node and a second node obtains first timing for transmitting a first packet from the first node, second timing for receiving the first packet in the second node, third timing for transmitting a second packet corresponding to the first packet from the second node, fourth timing for receiving the second packet in the first node, fifth timing for transmitting a third packet from the second node, and sixth timing for receiving the third packet in the first node to estimate a clock frequency offset based on the obtained timings, measures a first distance and a second distance based on the clock frequency offset and some of the timings, and measures a distance between the first node and the second node based on the first distance and the second distance.

Abstract: Provided are a capsule endoscopy system, a medical system, and an operation method of the medical system. A control device outside a human body and two or more implantable medical devices (e.g. capsule endoscopes) form a network with each other, and the two or more implantable medical devices divisionally perform investigation, identification, and treatment while cooperating with each other, by controlling the control device outside the human body.

Abstract: A modulation device uses two base signal axes including a cosine function and two base signal axes including a sine function to modulate bit information and generate a modulation symbol. Accordingly, the frequency efficiency characteristic is improved while maintaining a great power efficiency characteristic.

Abstract: Disclosed is a method for modulating and demodulating data. The method composes symbols by grouping a plurality of symbols for pulse position modulation to newly add symbol compositions to fixed symbols used for the pulse position modulation of the related art. Further, the method uses grouped symbols to improve data transmission rate as the average amount of information increases.

Abstract: Disclosed is an optical composite for use in a backlight unit of a liquid crystal display or an illumination apparatus, which is able to sufficiently increase luminance and in which adhesion portions are regularly arranged to thus induce an optical illusion effect so that scratches or stains cannot be seen clearly. A method of manufacturing such an optical composite is also provided. There is no need to additionally use optical films or prism sheets, thus making it possible to inexpensively manufacture optical devices, such as backlight units.

Abstract: The inverted L antenna with fixed polarization is disclosed. The inverted L antenna with fixed polarization includes: a printed circuit board (PCB) including an metal layer, a dielectric layer and a ground layer; and an antenna element coupled to a predetermined shaped of one side of the PCB, wherein the predetermined shape is a form for directing an electric field excited at edge of PCB to match with a direction of the antenna element.

Abstract: Provided is a radio communication system for ultra wideband (UWB) impulse communications and a radio communication apparatus and method thereof. The present patent provides a radio communication system that can minimize power consumption by eliminating a need for carrier detection and sharing transmission/reception time information in UWB impulse communications. The system includes a network coordinator; and one or more devices communicating on a superframe basis in subordination to the network coordinator. The devices perform data transmission/reception in predetermined time slots and then they are inactivated to thereby reduce power consumption.

Abstract: Provided is a communication system for ultra wide band impulse communication, and more particularly, to a communication apparatus and method that can be used in a sensor network or a low-rate wireless personal area network. To be more specific, the present research suggests a transmitter employing multi-coded bi-orthogonal pulse position modulation/demodulation and a method thereof.

Abstract: Disclosed is a method for controlling a power level based on a packet error rate (PER) in a wireless personal area network (WPAN) system.

Abstract: Disclosed is an apparatus and method for generating pulse based on time delay and wave transform and transmitter of multi-frequency band communication system using the same. The apparatus includes: an apparatus for generating a pulse based on time delay and wave transform, including: a time delay control unit having a plurality of time delay controller, each for providing time delay information; an amplitude control unit for providing amplitude information; a time delay unit having a plurality of time delayers, each for departing a square wave from a trigger signal, delaying time of the square wave based on the time delay information, and adjusting an amplitude of the square wave based on the amplitude information, to thereby generate a time-delayed signal; a pulse shaping unit for shaping a pulse based on the time-delayed signals; and a wave transforming unit for transforming the pulse to a desired signal.

Abstract: The inverted L antenna with fixed polarization is disclosed. The inverted L antenna with fixed polarization includes: a printed circuit board (PCB) including an metal layer, a dielectric layer and a ground layer; and an antenna element coupled to a predetermined shaped of one side of the PCB, wherein the predetermined shape is a form for directing an electric field excited at edge of PCB to match with a direction of the antenna element.

Abstract: Disclosed is a method for controlling power level of received signal in an ultra wide band transmission system which uses multi frequency bands, and includes a pre-gain controller (PGC) and a voltage gain amplifier (VGA). The method for controlling a power level of a received signal includes the steps of: a) at the PGCs, detecting which multi frequency band is used in a transmitter of the transmission system; b) at the PGCs, obtaining the voltage gain owing to the discrepancy in the power levels of the received signals; and c) at the PGCs, compensating for the power loss based on the voltage gain.

Abstract: Disclosed is a method for controlling a power level based on a packet error rate (PER) in a wireless personal area network (WPAN) system.

Abstract: Disclosed is a method for controlling power level of received signal in an ultra wide band transmission system which uses multi frequency bands, and includes a pre-gain controller (PGC) and a voltage gain amplifier (VGA). The method for controlling a power level of a received signal includes the steps of: a) at the PGCs, detecting which multi frequency band is used in a transmitter of the transmission system; b) at the PGCs, obtaining the voltage gain owing to the discrepancy in the power levels of the received signals; and c) at the PGCs, compensating for the power loss based on the voltage gain.