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    • 71. 发明授权
    • LED light emitting device and method of driving the same
    • LED发光装置及其驱动方法
    • US08525433B2
    • 2013-09-03
    • US12825635
    • 2010-06-29
    • Dong-Hun LeeKyung-Goo LeeHong-Gyu HanJung-Won KimDong-Hee Kim
    • Dong-Hun LeeKyung-Goo LeeHong-Gyu HanJung-Won KimDong-Hee Kim
    • H05B37/02
    • H05B33/0815H05B33/0827Y02B20/347
    • An LED light emitting device and a method of driving the same are provided, and technology that can uniformly sustain the magnitude of a channel current flowing to a plurality of LED channels is disclosed. The LED light emitting device includes: a plurality of LED channels that are formed with a plurality of LED elements that are continuously connected in series; and a constant current source that controls each channel current flowing to the plurality of LED channels according to a predetermined channel reference current to be a predetermined setting channel current, wherein the constant current source includes a plurality of operating amplifiers that control the magnitude of each of the channel currents, and a feedback voltage generating according to a predetermined offset reference current is input to a second input terminal of an operating amplifier for an offset setting period that sets an offset voltage of the plurality of operating amplifiers, a reference voltage generating according to a channel reference current is input to a first input terminal of the operating amplifier, and an offset voltage of each of the plurality of operating amplifiers is set so that an actual channel current may be identical to a predetermined setting channel current.
    • 提供了一种LED发光器件及其驱动方法,并且公开了能够均匀地维持流向多个LED通道的沟道电流的大小的技术。 LED发光装置包括:多个LED通道,其形成有连续串联连接的多个LED元件; 以及恒定电流源,其根据预定的通道参考电流来控制流向所述多个LED通道的每个通道电流为预定设定通道电流,其中所述恒流源包括多个运算放大器,所述多个运算放大器控制每个 根据预定的偏移参考电流产生的通道电流和反馈电压被输入到运算放大器的第二输入端,用于设置多个运算放大器的偏移电压的偏移设置周期,根据 通道参考电流被输入到运算放大器的第一输入端,并且设置多个运算放大器中的每一个的偏移电压,使得实际的通道电流可以与预定的设定通道电流相同。
    • 74. 发明授权
    • System and method for optimizing handover in mobile communication system
    • 移动通信系统优化切换的系统和方法
    • US08185114B2
    • 2012-05-22
    • US12725120
    • 2010-03-16
    • Jung-Won KimBo-Kyung WangYong Chang
    • Jung-Won KimBo-Kyung WangYong Chang
    • H04W36/00
    • H04W36/0055H04L1/1867
    • Disclosed are a system and a method for optimizing a handover process in a mobile broadband wireless access system. The method performs handover in a mobile communication system including a mobile subscriber station, a serving base station currently providing service to the mobile subscriber station, and at least one neighbor base stations adjacent to the serving base station. The method includes the steps of receiving a handover request from the mobile subscriber station by the serving base station; instructing the mobile subscriber station to perform handover by the serving base station in response to the handover request from the mobile subscriber station and performing by the mobile subscriber station a network reentry process for fast handover in accordance with information included in a handover instruction from the serving base station.
    • 公开了一种在移动宽带无线接入系统中优化切换过程的系统和方法。 该方法在包括移动用户台,当前向移动用户台提供服务的服务基站以及与服务基站相邻的至少一个相邻基站的移动通信系统中执行切换。 该方法包括以下步骤:由服务基站从移动用户台接收切换请求; 指示移动用户台响应于来自移动用户台的切换请求,由服务基站执行切换,并根据包括在来自服务的切换指令中的信息由移动用户台执行用于快速切换的网络再入进程 基站。
    • 77. 发明授权
    • System and method for optimizing handover in mobile communication system
    • 移动通信系统优化切换的系统和方法
    • US07720473B2
    • 2010-05-18
    • US11146683
    • 2005-06-07
    • Jung-Won KimBo-Kyung WangYong Chang
    • Jung-Won KimBo-Kyung WangYong Chang
    • H04W4/00
    • H04W36/0055H04L1/1867
    • Disclosed are a system and a method for optimizing a handover process in a mobile broadband wireless access system. The method performs handover in a mobile communication system including a mobile subscriber station, a serving base station currently providing service to the mobile subscriber station, and at least one neighbor base stations adjacent to the serving base station. The method includes the steps of receiving a handover request from the mobile subscriber station by the serving base station; instructing the mobile subscriber station to perform handover by the serving base station in response to the handover request from the mobile subscriber station and performing by the mobile subscriber station a network reentry process for fast handover in accordance with information included in a handover instruction from the serving base station.
    • 公开了一种用于优化移动宽带无线接入系统中的切换过程的系统和方法。 该方法在包括移动用户台,当前向移动用户台提供服务的服务基站以及与服务基站相邻的至少一个相邻基站的移动通信系统中执行切换。 该方法包括以下步骤:由服务基站从移动用户台接收切换请求; 指示移动用户台响应于来自移动用户台的切换请求,由服务基站执行切换,并根据包括在来自服务的切换指令中的信息由移动用户台执行用于快速切换的网络再入进程 基站。
    • 79. 发明授权
    • Method and system for handoff between base stations supporting multi-profile operation in BWA system
    • 在BWA系统中支持多轮廓操作的基站之间切换的方法和系统
    • US07603121B2
    • 2009-10-13
    • US11197143
    • 2005-08-04
    • Jun-Hyung KimGeun-Hwi LimJung-Won KimHong-Sung ChangYong ChangJoon-Ho Park
    • Jun-Hyung KimGeun-Hwi LimJung-Won KimHong-Sung ChangYong ChangJoon-Ho Park
    • H04W36/00
    • H04W36/0055
    • Disclosed is a method for performing handoff by a Mobile Station (MS) in a Broadband Wireless Access (BWA) communication system including a serving Base Station (BS) and at least one neighbor BS adjacent to the serving BS, the serving BS currently providing a service to the MS. The method including receiving physical layer information for communication from said at least one neighbor BS by the serving BS; combining by the serving BS the received physical layer information of said at least one neighbor BS, inserting the physical layer information into an advertisement message, and transmitting the advertisement message to the MS; and receiving by the MS the advertisement message, and performing a handoff according to the physical layer information of said at least one neighbor BS included in the advertisement message when the handoff occurs.
    • 公开了一种用于在包括服务基站(BS)和与服务BS邻近的至少一个邻近BS的宽带无线接入(BWA)通信系统中的移动台(MS)进行切换的方法,服务BS当前提供 服务于MS。 该方法包括从服务BS接收来自所述至少一个相邻BS的通信的物理层信息; 由所述服务BS组合所述至少一个相邻BS的所接收的物理层信息,将所述物理层信息插入到广告消息中,并将所述广告消息发送到所述MS; 以及由所述MS接收所述广告消息,以及当所述切换发生时,根据所述广告消息中包括的所述至少一个相邻BS的物理层信息执行切换。
    • 80. 发明授权
    • Balanced optical-radiofrequency phase detector
    • 平衡光射频相位检测器
    • US07397567B2
    • 2008-07-08
    • US11609195
    • 2006-12-11
    • Franz X. KaertnerJung-Won Kim
    • Franz X. KaertnerJung-Won Kim
    • G01B9/02
    • G01J9/02G01J9/04G04G7/00H01S3/1304H01S3/2383
    • A balanced optical-RF phase detector for the extraction of low-jitter radiofrequency (RF) signals from optical pulse trains is demonstrated. The extraction of the low-jitter radiofrequency signals is based on the precise phase detection by use of a differentially biased Sagnac-loop interferometer and synchronous detection. The phase-error signal from this balanced optical-RF phase detector, which is robust against drifts and photodetector nonlinearities, is used to regenerate low-jitter radiofrequency signals from optical pulse trains. Alternatively, the phase-error signal is used to generate a low-jitter optical pulse train, synchronized with a master radiofrequency signal or to synchronize multiple modelocked lasers with each other.
    • 证明了用于从光脉冲串提取低抖动射频(RF)信号的平衡光 - 射相位检测器。 低抖动射频信号的提取基于通过使用差分偏置的Sagnac环路干涉仪和同步检测的精确相位检测。 来自该平衡光 - RF相位检测器的相位误差信号对于漂移和光电检测器非线性都是鲁棒的,用于再生来自光脉冲串的低抖动射频信号。 或者,相位误差信号用于产生与主射频信号同步的低抖动光脉冲串,或者使多个锁模激光器彼此同步。