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79 条记录 (耗时 0.031 秒)

    Device and method for symbol frame synchronization of OFDM transmitter and receiver
    54.
    发明授权
    Device and method for symbol frame synchronization of OFDM transmitter and receiver 有权
    OFDM发射机和接收机的符号帧同步的装置和方法

    公开(公告)号：US07319660B2

    公开(公告)日：2008-01-15

    申请号：US10412262

    申请日：2003-04-14

    申请人： Ki-yun Kim ,  Ho Kim ,  Jun-yun Lee ,  Hyung-jin Choi

    发明人： Ki-yun Kim ,  Ho Kim ,  Jun-yun Lee ,  Hyung-jin Choi

    IPC分类号： H04J11/00

    CPC分类号： H04L27/2613 ,  H04L27/2656

    摘要： Provided is a frame synchronization pattern design and synchronization method by which in a transmitter of a communications system employing an orthogonal frequency division multiplexing (OFDM), a frame synchronization pattern is inserted into the starting part of a symbol frame, and by detecting the frame synchronization pattern in a receiver, synchronization of the OFDM transmitter and receiver is performed. Also, provided are a transmitter synchronization apparatus including an OFDM symbol frame generation unit, a frame synchronization pattern insertion unit, and an OFDM transmission signal conversion unit, and a receiver synchronization apparatus comprising a frame synchronization pattern inserted OFDM symbol frame conversion unit, a frame synchronization pattern detection unit, and a source data generation unit.Overcoming the conventional notion depending on the earlier art OFDM symbol standards, the OFDM symbol frame start detection method according to the present invention places a free-length code pattern, which is separately generated in a time domain, in the starting point of a frame and detects this pattern such that accuracy and efficiency greatly improve. Also, since the power value of a received signal is detected in the method, the communications system operates regardless of the frequency offset and phase offset. In addition, since a free-length pattern can be designed, the start point of a frame can be accurately detected in a seriously fading channel, by detecting a maximum peak based on correlation.

    摘要翻译： 提供了一种帧同步模式设计和同步方法，在采用正交频分复用（OFDM）的通信系统的发射机中，将帧同步模式插入符号帧的起始部分，并通过检测帧同步 接收机中的模式，执行OFDM发射机和接收机的同步。 此外，提供了包括OFDM符号帧生成单元，帧同步码型插入单元和OFDM传输信号转换单元的发射机同步装置，以及包括帧同步码型插入OFDM符号帧转换单元的接收机同步装置， 同步模式检测单元和源数据生成单元。 根据本发明的OFDM符号帧起始检测方法克服了以前的OFDM符号标准的常规概念，将在时域中单独生成的自由长度码模式放在帧的起点处， 检测这种模式，使得精度和效率大大提高。 此外，由于在该方法中检测到接收信号的功率值，所以通信系统不管频率偏移和相位偏移如何运行。 此外，由于可以设计自由长度图案，因此通过基于相关性检测最大峰值，可以在严重衰落的信道中准确地检测帧的起始点。

    GAS SEPARATION TYPE SHOWERHEAD
    57.
    发明申请
    GAS SEPARATION TYPE SHOWERHEAD 审中-公开
    气体分离式淋浴

    公开(公告)号：US20070163440A1

    公开(公告)日：2007-07-19

    申请号：US11624749

    申请日：2007-01-19

    申请人： Kyung Kim ,  Guen Bae ,  Ho Kim

    发明人： Kyung Kim ,  Guen Bae ,  Ho Kim

    IPC分类号： B03C3/011

    CPC分类号： C23C16/45565 ,  C23C16/45574 ,  C23C16/509 ,  H01J37/3244 ,  H01J37/32449

    摘要： Provided is a gas separation type showerhead for effective energy supply. The gas separation type showerhead includes: a gas supply module to which a first gas and a second gas are separately supplied; a gas separation module in which the supplied first and second gases are separately dispersed; and a gas injection module which is a multi-hollow cathode having a plurality of holes and in which the first and second gases separately dispersed are ionized in the holes to be commonly dispersed.

    摘要翻译： 提供了一种用于有效能量供应的气体分离式喷头。 气体分离式喷头包括：分别供应第一气体和第二气体的气体供给模块; 气体分离模块，其中供应的第一和第二气体分开分散; 以及气体注入模块，其是具有多个孔的多空心阴极，其中分开分散的第一和第二气体在孔中离子化以使其共同分散。

    Tag authentication apparatus and method for radio frequency identification system
    58.
    发明申请
    Tag authentication apparatus and method for radio frequency identification system 审中-公开
    用于射频识别系统的标签认证装置和方法

    公开(公告)号：US20070133807A1

    公开(公告)日：2007-06-14

    申请号：US11607496

    申请日：2006-11-30

    申请人： Hang Lee ,  Do Hong ,  Ho Kim

    发明人： Hang Lee ,  Do Hong ,  Ho Kim

    IPC分类号： H04L9/00

    CPC分类号： H04L9/0891 ,  H04L9/3236 ,  H04L2209/38 ,  H04L2209/805

    摘要： A radio frequency identification (RFID) tag authentication apparatus and method for accomplishing quick authentication and solving privacy problems using a hash algorithm are provided. An RFID tag includes a memory unit storing a tag's secret information and a group's secret information and a hash chain computation unit encrypting secret information based on a hash algorithm. The tag authentication apparatus includes a DB storing information about RFID tags, which is classified into groups and includes each group's secret information and each tag's secret information; a group's secret information search unit finding a group to which a tag to be authenticated belongs; and a tag's secret information search unit searching tags' secret information included in the found group.

    摘要翻译： 提供了使用散列算法实现快速认证和解决隐私问题的射频识别（RFID）标签认证装置和方法。 RFID标签包括存储标签的秘密信息和组的秘密信息的存储单元以及基于散列算法加密秘密信息的散列链计算单元。 标签认证装置包括存储关于RFID标签的信息的数据库，其被分类为组，并且包括每个组的秘密信息和每个标签的秘密信息; 查找要认证的标签属于的组的组的秘密信息搜索单元; 以及标签的秘密信息搜索单元，搜索包括在所找到的组中的标签的秘密信息。

    Emulsion fuel and method of preparing the same
    59.
    发明申请
    Emulsion fuel and method of preparing the same 审中-公开
    乳化燃料及其制备方法

    公开(公告)号：US20070113938A1

    公开(公告)日：2007-05-24

    申请号：US10574025

    申请日：2003-10-13

    申请人： Ho Kim

    发明人： Ho Kim

    IPC分类号： C06B47/00

    CPC分类号： C10L1/328

    摘要： The emulsion fuel according to the present invention is prepared by emulsifying about 55 to 90% by weight of a mixture of heavy oil, 45 to 10% by weight of water, and 0.3 to 0.8% by weight of a catalyst. The catalyst comprises caustic soda (sodium hydroxide) and calcium dichloride in half and half. The calcium chloride can be partly substituted with calcium sulfate.

    摘要翻译： 根据本发明的乳化燃料通过将约55至90重量％的重油，45至10重量％的水和0.3至0.8重量％的催化剂的混合物乳化而制备。 该催化剂含有一半和一半的苛性钠（氢氧化钠）和二氯化钙。 氯化钙可以部分被硫酸钙取代。