Abstract: A nitride semiconductor light emitting device includes n-type and p-type nitride semiconductor layers, and an active layer disposed between the n-type and p-type nitride semiconductor layers and having a stack structure in which a plurality of quantum barrier layers and one or more quantum well layers are alternately stacked. A net polarization of the quantum barrier layer is smaller than or equal to a net polarization of the quantum well layer. A nitride semiconductor light emitting device can be provided, which can realize high efficiency even at high currents by minimizing the net polarization mismatch between the quantum barrier layer and the quantum well layer. Also, a high-efficiency nitride semiconductor light emitting device can be achieved by reducing the degree of energy-level bending of the quantum well layer.

Abstract: A back-light unit including a plurality of substrates, a plurality of light sources respectively disposed on the plurality of substrates and configured to emit light, and N (N ?2) light guide plates respectively disposed adjacent to the plurality of light sources, each light guide plate including a light incidence part having a light incidence surface for receiving light emitted in a first direction from a corresponding light source, and a light emission part for emitting the received incident light in a second direction different than the first direction. Further, at least one of the light guide plates includes light-extracting surface patterns disposed on the light emission part, and the light-extracting surface patterns comprise a first region of light-extracting surface patterns having a higher pattern-density than a second region of light-extracting surface patterns next to the first region.

Abstract: A carrier phase and symbol timing recovery circuit and method may be used for robust synchronization in a broadcasting ATSC receiving system. Carrier phase and symbol timing offsets may be simultaneously adjusted by using redundancy information contained in an ATSC signal spectrum. A desired sampling time instant and carrier phase offset for synchronization may be simultaneously obtained due to correlation between carrier phase and symbol timing detectors.

Abstract: Disclosed herein are a keypad having a function button used to easily input characters in cellular phones and other character input devices and a method of easily inputting various languages and letters using the function button. The function button is set independently of a menu button. Whenever the function button is pushed in a default character input mode, the default character input mode is changed to an upper-case letter input mode, a lower-case letter input mode, a sentence mark input mode, a numeral input mode, a special character input mode and other language input modes. After a desired character has been inputted in a corresponding changed input mode, the function button is pushed to rapidly return to the initial character input mode. Various sentence marks can be effectively inputted using the function button.

Abstract: An activity monitoring system and method are disclosed to reduce the size of an activity sensor device to reduce its power consumption and smoothly transmit activity and occupancy information from the activity sensor device and an occupancy sensor device to an activity monitoring server to monitor an individual's activity and occupancy information.

Abstract: A health care system and method using a personal health device (PHD)-based universal health platform in a ubiquitous environment are disclosed. In order to measure health record by a PHD used by a user and automatically provide it so as to be used for various health care services via platforms, the health care system includes a measurement platform for collecting PHD standard personal health data from one or more PHDs, converting the collected data into clinical document architecture (CDA) standard data, and transmitting the converted data to an information collecting platform; and the information collecting platform for generating composite CDA standard data by using the received CDA standard data and providing the generated composite CDA standard data to services.

Abstract: Disclosed are a nitride based semiconductor device, including a high-quality GaN layer formed on a silicon substrate, and a process for preparing the same. A nitride based semiconductor device in accordance with the present invention comprises a plurality of nanorods aligned and formed on the silicone substrate in the vertical direction; an amorphous matrix layer filling spaces between nanorods so as to protrude some upper portion of the nanorods; and a GaN layer formed on the matrix layer.

Abstract: A sensor-based activity recognition system is disclosed. Activity information is received by using various sensors that can detect activities in daily life and analyzed to recognize daily activities of an individual. A required device can be controlled or relevant information is transferred to a management center according to the recognized daily activity to thus quickly cope with various situations.

Abstract: There are provided a hand-held device for detecting activities of daily living, and a system for detecting activities of daily living using the same. The hand-held device comprises a behavior information detector unit detecting physical activity information from user's movements; an article use information detector unit detecting article use information on whether the user uses the article from a sensor module attached to the article; a controller unit generating information on activities of daily living of the user from the physical activity information and the article use information; and a memory unit storing the information on the activities of daily living of the user.

Abstract: There is provided a method and apparatus for sensing a meal activity among the various activities of daily life using pressure sensors. A meal activity sensing apparatus collects sensor data detected through a plurality of pressure sensors installed in a smart meal mat, filters the collected sensor data, measures a pressure variance by using the filtered sensor data, determines whether a meal activity has taken place by comparing the measured pressure variance with a preset threshold value, and transmits meal activity information associated with the meal activity to an information processor communicating with the smart meal mat via radio frequency. Since this provides an advantage of more accurate detection of the meal activity, it can be useful in care services for eldercare facilities and for elderly individuals living alone, and further, in the efficient observance of an individual's daily meal patterns.

Abstract: The present invention provides a device for measuring uneven wear of starter brushes for a vehicle which can accurately measure and compare the lengths of the starter brushes and easily determine whether or not eccentricity of an armature occurs, the device comprising: a hollow support; a receiving plate formed integrally with the outer circumferential surface of an upper portion of the hollow support to accommodate a plurality of brushes; a lifting body liftably inserted into the inside of the hollow support; a plurality of detection rods slidably connected to the outer circumferential surface of an upper portion of the lifting body and moving forward or backward toward the brushes; a lift driving means for driving the lifting body; a plurality of measuring sensors for measuring the lengths of the brushes by means of the detection rods; and an LCD panel for displaying the measured lengths; and a control unit for controlling the lift driving means, the measuring sensors and the LCD panel.

Abstract: The present invention relates to a heteropoly acid catalyst which is used for the production of methacrylic acid by gas phase oxidation of methacrolein and a preparing method thereof. The present invention, thereby, provides a novel heteropoly acid catalyst having excellent methacrolein conversion rate, methacrylic acid selectivity and yield.

Abstract: Disclosed are a nitride based semiconductor device, including a high-quality GaN layer formed on a silicone substrate, and a process for preparing the same. A nitride based semiconductor device in accordance with the present invention comprises a plurality of nanorods aligned and formed on the silicone substrate in the vertical direction; an amorphous matrix layer filling spaces between nanorods so as to protrude some upper portion of the nanorods; and a GaN layer formed on the matrix layer.

Abstract: A complex system having an ink-jet printing function and a testing function, and an ink-jet printing apparatus having the same is disclosed. The complex system includes a plurality of ink-jet heads for feeding ink to form a plurality of patterns on a printing object. A gantry is movable over the printing object where the plurality of ink-jet heads is mounted. In addition, the complex system includes at least one test device, being mounted on a back side of the gantry, for testing the status of the plurality of patterns formed on the printing object; and a controller for controlling respective operations of the plurality of ink-jet heads, the gantry, and at least one test device.

Abstract: Method and apparatus for use with digital television receivers are included among the embodiments. In exemplary systems, the presence of an interfering analog television signal (e.g., an NTSC signal) in the same channel as a DTV signal is verified by detecting the presence of analog sync signals in the received signal band. When sync signals of the proper frequency are detected, an analog TV signal rejection filter is inserted in the DTV received signal processing path. Other embodiments are described and claimed.

Abstract: A method for demodulating a carrier wave in a channel environment in which a pilot signal may be distorted, in a digital TV receiver, which may receive a vestigial sideband (VSB) modulated and transmitted signal, and a demodulation apparatus therefor are provided. A field synchronization part of a VSB signal, in which a pilot signal may be removed, may be used as a reference signal for synchronization. The frequency offset of a carrier wave may be estimated through self-correlation of a signal, and the phase offset of the carrier wave may be estimated through a pilot-less frequency and phase locked loop (FPLL).

Abstract: The invention relates to a monolithic white light emitting device using wafer bonding or metal bonding. In the invention, a conductive submount substrate is provided. A first light emitter is bonded onto the conductive submount substrate by a metal layer. In the first light emitter, a p-type nitride semiconductor layer, a first active layer, an n-type nitride semiconductor layer and a conductive substrate are stacked sequentially from bottom to top. In addition, a second light emitter is formed on a partial area of the conductive substrate. In the second light emitter, a p-type AlGaInP-based semiconductor layer, an active layer and an n-type AlGaInP-based semiconductor layer are stacked sequentially from bottom to top. Further, a p-electrode is formed on an underside of the conductive submount substrate and an n-electrode is formed on a top surface of the n-type AlGaInP-based semiconductor layer.

Abstract: An apparatus may include a sort circuit for receiving first and second baseband signals, where the sort circuit shifting frequencies of the first and second baseband signals. The apparatus may also include a removal circuit for receiving the shifted first and second baseband signals and for combining the shifted first and second baseband signals to provide a frequency-modulated signal, and a symbol timing restoration circuit for measuring a timing error in related symbols of the frequency-modulated signal, for generating an address selection signal that is proportional to the timing error, in response to a carrier restoration signal, and for indicating restoration of the carrier.

Abstract: A method and apparatus for performing channel equalization in a communication system may potentially reduce power consumption in channel equalizers of communication systems. A filtering circuit filters a received data sequence as a plurality of data values to be stored in a plurality of filter cells. Each filter cell may store at least one data value and may contain a coefficient related to the stored data value. A coefficient updating circuit may update the coefficients based on at least one parameter, and may compare the updated coefficients to a threshold. Based on the comparison, filter cells of selected coefficients may be selected for restoring the received data sequence to its original state.

Abstract: The invention relates to a monolithic white light emitting device using wafer bonding or metal bonding. In the invention, a conductive submount substrate is provided. A first light emitter is bonded onto the conductive submount substrate by a metal layer. In the first light emitter, a p-type nitride semiconductor layer, a first active layer, an n-type nitride semiconductor layer and a conductive substrate are stacked sequentially from bottom to top. In addition, a second light emitter is formed on a partial area of the conductive substrate. In the second light emitter, a p-type AlGaInP-based semiconductor layer, an active layer and an n-type AlGaInP-based semiconductor layer are stacked sequentially from bottom to top. Further, a p-electrode is formed on an underside of the conductive submount substrate and an n-electrode is formed on a top surface of the n-type AlGaInP-based semiconductor layer.

Abstract: A multi-sprinkler controller includes a timer-activated motor which drives a rotor disc. The rotor disc operates the opening and closing of several water passages through which water is supplied to the various sprinklers which make up a sprinkler system.