Abstract:
디스플레이 장치가 개시된다. 본 디스플레이 장치는 디스플레이 패널, 복수의 발광 소자를 이용하여 디스플레이 패널로 빛을 제공하는 백라이트 유닛, 구동 전압의 크기(amplitude)에 기초하여, 구동 전류를 복수의 발광 소자로 제공하는 드라이버, 드라이버에 연결된 출력 저항의 저항 값 별로, 복수의 밝기에 따른 구동 전압의 크기에 대한 정보가 저장된 메모리 및 디스플레이 패널의 밝기 값에 기초하여 출력 저항의 저항 값을 설정하고, 메모리에 저장된 정보에 기초하여 설정된 저항 값에 대응되는 복수의 밝기에 따른 구동 전압의 크기 중 디스플레이 패널의 밝기 값에 대응되는 구동 전압의 크기를 식별하고, 식별된 크기의 구동 전압을 드라이버에 인가하는 프로세서를 포함하며, 구동 전류의 크기는, 구동 전압의 크기 및 출력 저항의 저항 값에 기초하여 결정된다.
Abstract:
PURPOSE: An apparatus and a method for parallel processing in consideration of a parallelism degree are provided to reduce performance deterioration due to a load imbalance by selectively performing a task or a data level parallel process. CONSTITUTION: Processing cores process tasks. A granularity determiner(212) determines the parallelism granularity of a task. A code allocator(213) selects a sequential version code or a parallel version code by the size of the parallel processing unit and allocates the selected code to a processing core. The granularity determiner determines whether the size of the parallel processing unit corresponds to a task level or a data level.
Abstract:
단방향 지연시간 추정 및 이를 이용한 클럭 동기화 방법 및 장치가 개시된다. 그 방법은, 네트워크에 연결되어 소정의 패킷을 주고 받는 두 호스트간의 단방향 지연시간을 추정하는 방법에 있어서, (a) 상기 일측 호스트에서 k(단, k는 자연수), k+1 및 k+2번째 전송 시점을 측정하고, 상기 타측 호스트에서 k 및 k+1번째 전송 시점을 측정하는 단계; (d) 상기 일측 호스트에서 측정된 m(단, m은 k 또는 k+1)번째 전송 시점과 상기 타측 호스트에서 측정된 m번째 전송 시점의 시간차를 구하고, 하나 이상의 상기 측정된 전송 시점을 이용하여 m번째 상기 단방향 지연시간을 구하는 단계; (e) 상기 구해진 시간차가 상기 구해진 단방향 지연시간과 일치하는지 판단하는 단계; 및 (f) 일치한다고 판단되면, 상기 구해진 단방향 지연시간 이하의 값을 상기 추정하고자 하는 단방향 지연시간으로서 결정하는 단계를 구비하는 것을 특징으로 한다. 그러므로, 본 발명은, 종래에 단방향 지연시간을 추정하는 경우에 비하여 추정 오차가 적으며, 두 호스트가 비대칭으로 연결되어 있는 경우에도 단방향 지연시간을 예측할 수 있는 효과를 갖는다.
Abstract:
PURPOSE: An interrupt spreading method, an interrupt spreading device, and a system on chip having the same are provided to prevent processors in an inactive state from being consecutively changed into an active state within a short time, thereby preventing the generation of an inrush current in the inside of the processors. CONSTITUTION: Interrupt holders (120_1~120_m) receive interrupt request signals and output the interrupt request signals to processors at a set time interval. If a time interval between adjacent interrupt request signals among the interrupt request signals is smaller than the set time interval, an interrupt arbiter (140) adjusts the time interval to the set time interval. The interrupt request signals are generated on the basis of a plurality of interrupts outputted from a plurality of interrupt sources.
Abstract:
PURPOSE: A clock control method of an SoC(System On Chip) including a function block, an SoC implementing the same, and a semiconductor system including the same are provided to reduce unnecessary power consumption by separately controlling an operating clock supplied to the function block. CONSTITUTION: A clock generating unit(110) generates a reference clock having a reference frequency. A clock controller(100) monitors a state of a function block(120) to determine the state as an activation mode, a wakeup mode, or an inactivation mode. The clock controller changes an operating frequency in the inactivation mode to a first frequency. The clock controller changes the operating frequency in the wakeup mode to a second frequency. The clock controller changes the operating frequency in the activation mode to a third frequency. The clock controller outputs an operating clock having the operating frequency corresponding to each mode to the function block.
Abstract:
A one-way delay time estimation method and a device thereof are provided to exactly estimate one-way delay time between a client and a server even though the client and the server cannot receive the same timing information, thereby accurately synchronizing a clock of the client with a clock of the server. A time measurer(210) measures transmission time of an ICMP(Internet Control Message Protocol) packet. An operator(216) operates a time difference between transmission time measured in a server and transmission time measured in a client, and operates one-way delay time between the server and the client in case a clock of the client is synchronized with a clock of the server. A comparator(218) compares the operated time difference with the operated one-way delay time. A delay time estimator(220) determines one of values which are less than the operated one-way delay time as one-way delay time between the server and the client, by responding to the compared results.
Abstract:
A cache memory system capable of controlling the number of blocks stored to a cache memory and an operation method thereof are provided to reduce time needed for memory access with reduction of a cache-miss frequency by storing a plurality of blocks neighboring with data of which spatial locality is prevent over a wide area to the cache memory. The second memory stores the block, which is an internal storage area of the first memory, between a CPU and the first memory. A block amount determiner directs the number of blocks to be stored in the second memory to the first memory. A masking circuit generates a masking address, which are bits excluding a part of bits corresponding to a masking bit from an address, by responding to the masking bit. The block amount determiner includes an index table(261) including a plurality of entries and an index comparator(267) generating a comparison signal by comparing the masking address with an index, which is stored to the entry and represents the area of the first memory. Each entry includes an index storing part(263) and an access frequency storing part(264).
Abstract:
PURPOSE: A color image forming apparatus and a color image forming method using the apparatus are provided to carry out development through a multi-path method and obtain high printing quality. CONSTITUTION: A color image forming apparatus includes a photosensitive drum(420), a charger for charging the photosensitive drum, and an exposing unit(410) that is located under the photosensitive drum and irradiates light on the charged photosensitive drum to form an electrostatic latent image. The apparatus further includes a developing unit, a transfer unit(440), and a fixing unit(490). The developing unit has four-color developers(430C,430M,430Y,430K). A developing roller set in each of the developers develops the electrostatic latent image with a toner. The transfer unit transfers the developed image to paper. The fixing unit fixes the image transferred on the paper to the paper. The four-color developers are arranged in the order of magenta, cyan, yellow and black developers between the exposing unit and the fixing unit.