Abstract: Disclosed is an apparatus and method for transmitting data in a wireless communication system. The apparatus for transmitting a packet data in a wireless communication system includes a Media Access Control (MAC) layer for determining the number of preambles to be inserted based on a feed-back reply signal from a receiver, and generating a multi-preamble aggregation packet by inserting the determined number of preambles into packets received from an upper layer and a physical layer for forming the multi-preamble aggregation packet generated in a data processing unit, by using a physical layer packet, and transmitting the formed multi-preamble aggregation packet.

Abstract: A transmission method performed by a mobile station for random access channel (RACH) burst transmission diversity gain is provided. According to the method, a variety of combinations of a time switching transmit diversity (TSTD) technique, a frequency hopping technique, and a power ramping technique that are robust against fading channel environments are applied to transmission of an RACH burst, thereby increasing the probability of detecting an RACH signature of a base station. Also, by using the transmission parameters (subband frequencies, transmission antennas, power, etc.) which are used for successful transmission of an RACH burst, for transmission of a successive user packet data, reliable transmission of the successive user packet data can be performed.

Abstract: In order to set an inspection area, a measurement target is disposed onto a stage, a reference data of the measurement target is summoned, and a measurement data of the measurement target is acquired. Then, at least one feature object is selected in the measurement data and the reference data of the measurement target, and at least one feature variable for the selected feature object is extracted from each of the reference data and the measurement data. Thereafter, a change amount of the measurement target is produced by using the feature variable and a quantified conversion formula, and the produced change amount is compensated for to set an inspection area. Thus, the distortion of the measurement target is compensated for to correctly set an inspection area.

Abstract: The present invention relates to a technology for reducing dark current noise by discharging electrons accumulated on a surface of an image sensor photodiode. In an N-type or P-type photodiode, a channel is formed between the photodiode and a power voltage terminal, so that electrons (or holes) accumulated on a surface of the photodiode are discharged to the power voltage terminal through the channel.

Abstract: Provided is a pad layout structure of a semiconductor chip capable of preventing lead-broken problems when packaging the semiconductor chip with a high aspect ratio in a tape carrier package (TCP). In the pad layout structure of the semiconductor chip, a plurality pads are arranged along upper, lower, left and right sides of the semiconductor chip with a high aspect ratio, and a longitudinal width of pads arranged at the left and right sides and a transverse width of pads arranged at both edges of the upper and lower sides are greater than a transverse width of pads arranged at centers of the upper and lower sides.

Abstract: An apparatus and method for acquiring reliable frame synchronization performance and frequency synchronization simultaneously in a communication system includes a differential correlator outputting a result value obtained by performing a differential operation based on an input signal having symbol timing synchronization and a value pre-defined with a sender sending the input signal, a frequency error calculator compensating for a frequency error based on the result value of the differential correlator and a frequency compensation control signal, and a frame synchronization determiner outputting the frequency compensation control signal if the result value of the differential correlator is greater than a threshold set having at least one value. By introducing a correlation scheme, i.e.

Abstract: The surface shape measuring system includes an illumination unit including a main light source, a focusing lens, and a projection lens; a beam splitter to split illumination light emitted respectively irradiated onto a reference surface and a measurement surface; a light detecting element to capture an interference pattern; and a control computer to obtain surface shape data through white-light interference pattern analysis from an image captured and detect whether or not the measurement surface is defective from the obtained data, wherein a subsidiary light source to provide falling illumination to the target object; and two-dimensional data and three-dimensional data regarding the surface shape of the target object are obtained by selectively intermitting the turning-on of the main light source and the subsidiary light source and the irradiation of the illumination light onto the reference surface.

Abstract: Conventional bottom blade type trefoil flight vehicles have composite structures wherein a plurality of pairs of fixing plates, forward/backward adjustment blades, and left and right rotation adjustment blades are separately mounted and adjusted, and thus have difficulties in scouting and surveillance in an indoor area due to the heavy weights and the large volumes of the flight vehicles. Another conventional flight vehicle has drawbacks in that flight in the left and right directions is difficult, and an adjustment blade and a fixing plate are arranged adjacent to each other to cause mutual influences of wind and non-uniformity in the flow of wind. The present invention provides a flight vehicle characterized in that three pairs of fixing plates with fixed pitch propellers and adjustment blades are installed at an angle of 120 degrees.

Abstract: There are provided a timing generating circuit which can generate the rising edge or the falling edge of pulses with a resolution higher than the frequency of a repeat signal generating circuit, and a phase shift circuit which can be applied to the timing generating circuit. The phase shift circuit receiving a repeat signal generates a signal of which a phase is shifted by a predetermined quantity on the basis of the repeat signal, the phase shift controller controls what phase of signal the phase shift circuit output among first to M-th signals, and the counter circuit counts the number of output signals of the phase shift circuit and generates a count end signal when the count value reaches a set value, and thereby the counter circuit outputs a synthesized timing signal of the timing of the repeat signal and the timing shifted by the phase shift circuit.

Abstract: Provided are a cell search method, a forward link frame transmission method, an apparatus using the methods, and a forward link frame structure in an Orthogonal Frequency Division Multiplexing cellular system, wherein the time it takes to perform a cell search and the complexity of the cell search can be reduced. The cell search apparatus includes a sync acquirer which receives a signal according to a forward link frame comprising a plurality of sync channel symbols each having different intervals between the adjacent sync channel symbols and achieves synchronization of the sync channel symbols using a sync channel of the received signal, and a boundary detector which detects a frame boundary using an interval pattern between the sync channel symbols, based on the achieved synchronization.

Abstract: A method for preparing a chemical mechanical polishing slurry composition comprises the steps of preparing an aqueous iron salt solution by admixing an iron salt and cooled water of 5° C. or less; preparing an oxide containing silicon and iron as an additive by admixing and stirring a silicon salt and the aqueous iron salt solution for carrying out a reaction of the silicon salt and the aqueous iron salt solution to form an additive solution; and mixing the additive solution with at least one abrasive, at least one oxidizing agent and optionally at least one additional component to form the chemical mechanical polishing slurry composition.

Abstract: Provided are a routing table generating method, a data transmission method, and a routing route formation method for multi-hop communication in high rate wireless personal networks. In a high rate WPAN environment including a plurality of piconets, a piconet controller (PNC), which performs a topology server function to provide the optimal route, collects link state information from the PNCs or DEVs (devices) belonging to a sub-tree that serves as a root and applies a minimum cost algorithm based on the collected link state information to calculate the optimal route for all pairs of originations and destinations existing within the sub-tree in consideration of QoS. The optimal route information is transmitted to the origination PNC via the destination PNC/DEV. During performing this, the optimal route between the pairs of originations and destinations is set.

Abstract: A wafer chucking apparatus for a plasma process includes a lower plate, on which a plurality of wafers are loaded, and an upper plate, which is coupled to an upper portion of the lower plate and fixes the loaded wafers. The upper plate is made of one of Teflon, ceramic and metal, and the lower plate is made of aluminum or ceramic. The lower plate includes a drilled gas feed hole through which gas is fed so as to uniformly maintain temperature of each wafer during the plasma process. One of more of an isothermal sheet and an isothermal coating layer is formed between the wafers and the lower plate so as to maintain temperature uniformity of the wafers. Thereby, the wafer chucking apparatus can improve uniformity of plasma-etched patterns at an edge zone of each wafer during the plasma process.

Abstract: Provided are a channel estimation method and apparatus in mobile communication system having dispersed pilot. The channel estimation apparatus includes an entire band channel estimation unit and an edge channel estimation unit. The entire band channel estimation unit performs channel estimation on an entire frequency band. The edge channel estimation unit performs channel estimation on an edge region. By separately performing the gating operation of the entire band channel estimation unit and the gating operation of the edge channel estimation unit, a channel frequency response is more accurately calculated even in an edge region.

Abstract: Disclosed are an apparatus and a method for managing radio resources, capable of effectively managing radio resources. When a normal call and a handover call are attempted, radio resources are allocated and it is determined whether or not to perform an overload control based on received load related information and then it is determined whether or not to admit the call depending on an availability of a bandwidth for radio resources, a priority of real time traffic or a locking probability of data. The quality and efficiency of a mobile communication service is enhanced by pertaining an effective allocation on radio resources and controlling the load of radio resources in the mobile communication system. The radio resource managing apparatus and method using the same are applied to IMT (International Mobile Telecommunications)-Advanced system base station, thereby optimizing the efficiency of radio resources.

Abstract: Disclosed is a system and method for providing a policy based radio frequency identification service. The system for providing the policy based radio frequency identification service includes a policy vocabulary managing device for generating and managing policy vocabulary based on a policy vocabulary writer's control input, a policy performing resource managing device for generating and managing resource information for performing a radio frequency identification service policy based on a resource designator's control input, a policy rule managing device for generating and managing a policy rule sentence based on a policy user's control input, and a policy rule performing device for performing a radio frequency identification service policy by using a policy rule sentence input based on a policy user's control input.

Abstract: Provided is a power transmission apparatus using a planetary gear having a plurality of gear trains. The apparatus includes: a housing including a cover which is open or closed, and a speed change locking unit which locks and releases selectively one of ring gears; a carrier installed inside the housing; a planet gear set including three or more different sized planet gears; a ring gear set including ring gears; a sun gear set including sun gears meshed with external teeth of the planet gears and having an output shaft which outputs power to an outside of the housing; and an input shaft which is aligned coaxially to the output shaft and rotates the carrier by external force transmitted from the outside of the housing. The input shaft extends out of the housing by passing through the shaft extension.

Abstract: Disclosed is an automatic tablet packing apparatus having sliding racks, wherein tablets received in a plurality of tablet cassettes are successively packed on a per dose basis based on a medical prescription. Each of the sliding racks includes a pair of left and right partition walls, a tablet discharge passage to guide the tablets discharged from the tablet cassettes being defined by facing inner surfaces of the left and right partition walls. Cassette pedestals are attached to outer surfaces of the left and right partition walls and in turn, the tablet cassettes are detachably arranged on the cassette pedestals. The left and right partition walls are able to be individually pulled out from a body of the apparatus. As the left or right partition wall is pulled out, the tablet discharge passage is revealed to the outside thus enabling easy cleaning thereof.

Abstract: There is provided a method for epitaxial growth, wherein a quantum dot is formed on an epitaxial layer using a quantum-dot forming material with an excellent lattice matching property, and the formed quantum dot is positioned on a defect in the epitaxial layer, thereby minimizing transfer of the defect into an epitaxial layer formed through a subsequent process. The method includes preparing a first epitaxial layer having a defect formed therein; coating an anti-surfactant on the first epitaxial layer; supplying a quantum-dot forming material lattice-matched with respect to the first epitaxial layer, thereby forming a quantum dot obtained by allowing the anti-surfactant to react with the quantum-dot forming material on the first epitaxial layer; allowing the quantum dot to be moved onto a step of the first epitaxial layer due to a difference of surface energies between the quantum dot and the first epitaxial layer; and growing a second epitaxial layer on the first epitaxial layer.

Abstract: Provided are a sensor node of a low power for a monitoring application in a mesh sensor network using a time division access scheme, and a routing method thereof. The routing method of the sensor node may include: transmitting a beacon containing routing information to neighboring nodes in a first time slot within a first beacon interval that is allocated to the sensor node; and receiving a beacon from each of the neighboring nodes in a second time slot within a second beacon interval that is allocated to each of the neighboring nodes.