Abstract:
본 발명은 압전형 마이크로 스피커에 대한 것으로서 이 장치는 기판, 상기 기판 상에 형성되어 있는 압전층, 상기 압전층 상에 형성되어 있는 상부 전극, 그리고 상기 압전층과 상기 상부 전극을 관통하며 하나의 캔틸레버 영역을 정의하는 홀을 매립하며 상기 상부 전극 상에 형성되어 있는 폴리머 다이아프램을 포함한다.따라서, 압전형 캔틸레버 또는 이와 유사한 구조를 이용한 폴리머 다이아프램 마이크로 스피커는 음악 및 소리의 발생을 위해 공진 주파수를 낮추고, 음압 발생을 높이기 위해 영률이 작은 재료 즉, 폴리머 등을 사용하여 저주파 영역까지 음압을 발생할 수 있다. 압전형 마이크로스피커, 캔틸레버, Parylene-C, 전극.
Abstract:
PURPOSE: A memory system comprising a plurality of DMA channels and an integrating management method for a plurality of DMA channels are provided to improve data transmission efficiency of a memory controller by the integrated management of multichannel memory controller and connected multiple DMA channels. CONSTITUTION: A memory controller(200) performs data transceiving operation with a memory(100). The memory controller comprises multiple channels which are physically separated each other. A DMA controller (300) is connected to the multiple channels of the memory controller and includes multiple DMA channels which are physically separated each other. The DMA controller performs data transceiving operation with the memory through the multiple DMA channels and the memory controller. An access module(400) connects the channels of the memory controller with the DMA channels each other.
Abstract:
PURPOSE: A low power consumption type semiconductor gas sensor is provided to improve gas sensing characteristics using low level semiconductor nano materials having high sensitivity characteristics at room temperature. CONSTITUTION: A low power consumption type semiconductor gas sensor comprises a membrane, a substrate(110) located on the lower part of the membrane and etched on the center area to expose the interval between the lower part of the membrane and the substrate, a heater(150) formed in the center area of the membrane and operated when desorbing gas adsorbed to a low level semiconductor nano material, an insulating membrane(170) formed on the membrane to cover the heater, a sensing electrode(180) formed in the center area of the insulating membrane, and a low level semiconductor nano material(190) formed on the sensing electrode.
Abstract:
PURPOSE: A polymer actuator and a fabrication method thereof are provided to solve difficulty of assembly after forming an electrode by using a shim in a flexible PCB. CONSTITUTION: A flexible PCB is manufactured by attaching a top electrode and a bottom electrode to the top and bottom of a support layer(110). The top side of the polymers and a top electrode plate of a flexible PCB are interlinked through plating to form a top electrode. The bottom side of the polymers and the bottom electrode plate of the flexible PCB to form a bottom electrode.
Abstract:
PURPOSE: A method for preparing titanium oxide nanotube cluster-graphite negative electrode active material of a one-dimensional structure for a lithium secondary battery is provided to ensure stable cycle property in a high speed charge-discharge. CONSTITUTION: A method for preparing titanium oxide nanotube cluster-graphite negative electrode active material of a one-dimensional structure for a lithium secondary battery comprises the steps of: (S11) performing hydrothermal synthesis of micro-sized spherical titanium oxide powder and micro-sized graphite powder in a strong alkali solution; (S12) controlling a pH value of hydrothermally synthesized titanium oxide nanotube cluster-graphite composite; and (S13) heat treating the titanium oxide nanotube cluster-graphite composite in which the pH value is controlled.
Abstract:
PURPOSE: An absolute difference operation device is provided to use one adder and one comparator, thereby performing absolute difference operation with a low logic surface load. CONSTITUTION: A comparator(410) compares the size between two integers. According to the comparing result, the first and the second selectors(420,430) respectively select/output one among two integers. An inverter(440) mending-process a selection result value of the second selector. An adder(450) adds 1 and a value which is mending-processes by the inverter and the selection result value of the first selector.
Abstract:
PURPOSE: A DMA controller with an interrupt control processor is provided to reduce interrupt control load of a main processors. CONSTITUTION: A DMA(Direct Memory Access) channel register bank(240) stores a DMA channel operation request and a DMA set point. An interrupt control processor(250) performs a control program stored in a program memory(220). A DMA channel control module(270) controls operation of a DMA channel(150) according to the DMA set value by responding to a DMA channel activation command. An interrupt/DMA request and cancel module(260) generates a release signal about an interrupt processed by the interrupt control processor.
Abstract:
PURPOSE: A micro-speaker and a manufacturing method thereof are provided to generate the sound pressure to the low band area by using the material like the polymer having the small Young modulus. CONSTITUTION: A micro speaker(100) comprises the Polymer diaphragm corresponding to loudspeaker, similarly, a cone paper. The micro-speaker comprises a plurality of piezoelectric cantilevers(110) corresponding to the voice coil driving the cone paper and the electrode(130) for transferring voltage to piezoelectric cantilevers. A piezoelectric layer is formed on a substrate. The upper electrode is formed on the piezoelectric layer. The Polymer diaphragm formed on the upper electrode passes through the piezoelectric layer and upper electrode. In order to fill in a hole defining one cantilever domain, the Polymer diaphragm is used.
Abstract:
PURPOSE: A multi channel data transfer device is provided to minimize repetitiveness of register setting according to a multi channel transfer, thereby reducing a control load by a processor. CONSTITUTION: A plurality of channel controllers(327_1~327_n) are respectively connected to a plurality of peripheral devices(331~33n). A plurality of control registers(326_1~326_n) stores setting data for controlling operation of each channel control device. A common register control unit(324) transfers a common setting data to whole or a part of the plurality of control register. The common setting data is commonly applied to whole or a part of the plurality of channel control device.
Abstract:
PURPOSE: An interrupt processing system is provided to improve the system efficiency by generating an interrupt signal only in a certain circumference. CONSTITUTION: Interrupt sources(241-24n) generate an interrupt signal. When the interrupt signal is activated, complex interrupt generators(231-23m) generate active complex interrupt signal. A logic operation unit generates the complex interrupt signal by performing an AND or OR operation according to a mode selection signal. Interrupt signal receivers detect the logic state of interrupt signals in consideration of a first control signal, and transfers the logic state to the operation unit selectively in consideration of the second control signal.