公开(公告)号：US6058121A

公开(公告)日：2000-05-02

申请号：US5043

申请日：1998-01-09

Applicant: Dong-kyu Kim ,  Sang-hyun Do ,  Hyung-jin Choi ,  Myeong-hwan Lee

Inventor： Dong-kyu Kim ,  Sang-hyun Do ,  Hyung-jin Choi ,  Myeong-hwan Lee

IPC: H04J11/00 ,  H04L1/00 ,  H04L7/00 ,  H04L27/26 ,  H04J1/00 ,  G01R23/00

CPC classification number: H04L27/2665 ,  H04L27/2662

Abstract: A fine fast Fourier transform window position recovering apparatus of an OFDM system receiver for recovering the phase error of an FFT window by using the number of zero-crossings of the phase variation value calculated between transmitted and received complex values is provided. The fine FFT window position recovering apparatus includes: an analog to digital converter, a symbol start detector, an FFT means, a phase calculator, a zero-crossing counter and an FFT window controller. The apparatus makes it possible to guarantee the reliability of a system by adjusting the phase error of the FFT window by using the number of zero-crossings of the phase variation calculated between the transmitted and received complex values and the number of the zero-crossings of the amplitude of the real part or the imaginary part of the received complex value.

Abstract translation: 提供了一种用于通过使用在发送和接收的复数值之间计算的相位变化值的过零值来恢复FFT窗口的相位误差的OFDM系统接收机的精细快速傅里叶变换窗口位置恢复装置。 精细FFT窗口位置恢复装置包括：模数转换器，符号起始检测器，FFT装置，相位计算器，过零计数器和FFT窗口控制器。 该装置使得可以通过使用在发送和接收的复数值之间计算出的相位变化的过零值与过零点的过零次数之间调整FFT窗的相位误差来保证系统的可靠性 接收到的复数值的实部或虚部的振幅。

公开(公告)号：US09198550B2

公开(公告)日：2015-12-01

申请号：US14380577

申请日：2012-02-29

Applicant: Man-Hyun Ryu ,  Dong-kyu Kim ,  Sung-Hyuk Kang

Inventor： Man-Hyun Ryu ,  Dong-kyu Kim ,  Sung-Hyuk Kang

IPC: A47L1/03 ,  A47L1/02

CPC classification number: A47L1/03 ,  A47L1/02 ,  A47L2201/04

Abstract: A window cleaning robot according to the present embodiment comprises a first cleaning unit and a second cleaning unit, which are respectively attached to and move on both surfaces of a window by magnetic force. The window cleaning robot further comprises: a first magnetic module included in the first cleaning unit; a second magnetic module included in the second cleaning unit; a magnetic force sensing part for sensing magnetic force between the first magnetic module and the second magnetic module; and a magnetic force controller for controlling the magnetic force between the first magnetic module and the second magnetic module, wherein the first magnetic module comprises a first magnet which is rotationally mounted, and a second magnet and a third magnet disposed on both sides of the first magnet, and the magnetic force controller rotates the first magnet so as to control the magnetic force between the first magnetic module and the second magnetic module.

Abstract translation: 根据本实施例的窗户清洁机器人包括第一清洁单元和第二清洁单元，其分别通过磁力附接到窗户的两个表面并在其上移动。 窗户清洁机器人还包括：包括在第一清洁单元中的第一磁性模块; 包括在第二清洁单元中的第二磁性模块; 用于感测第一磁性模块和第二磁性模块之间的磁力的磁力检测部件; 以及用于控制第一磁性模块和第二磁性模块之间的磁力的磁力控制器，其中第一磁性模块包括旋转地安装的第一磁体，以及设置在第一磁性模块的第二磁性模块的两侧的第二磁体和第三磁体 并且磁力控制器旋转第一磁体，以便控制第一磁性模块和第二磁性模块之间的磁力。

公开(公告)号：US20150027494A1

公开(公告)日：2015-01-29

申请号：US14380577

申请日：2012-02-29

Applicant: Man-Hyun Ryu ,  Dong-kyu Kim ,  Sung-Hyuk Kang

Inventor： Man-Hyun Ryu ,  Dong-kyu Kim ,  Sung-Hyuk Kang

IPC: A47L1/03

CPC classification number: A47L1/03 ,  A47L1/02 ,  A47L2201/04

Abstract: A window cleaning robot according to the present embodiment comprises a first cleaning unit and a second cleaning unit, which are respectively attached to and move on both surfaces of a window by magnetic force. The window cleaning robot further comprises: a first magnetic module included in the first cleaning unit; a second magnetic module included in the second cleaning unit; a magnetic force sensing part for sensing magnetic force between the first magnetic module and the second magnetic module; and a magnetic force controller for controlling the magnetic force between the first magnetic module and the second magnetic module, wherein the first magnetic module comprises a first magnet which is rotationally mounted, and a second magnet and a third magnet disposed on both sides of the first magnet, and the magnetic force controller rotates the first magnet so as to control the magnetic force between the first magnetic module and the second magnetic module.

Abstract translation: 根据本实施例的窗户清洁机器人包括第一清洁单元和第二清洁单元，其分别通过磁力附接到窗户的两个表面并在其上移动。 窗户清洁机器人还包括：包括在第一清洁单元中的第一磁性模块; 包括在第二清洁单元中的第二磁性模块; 用于感测第一磁性模块和第二磁性模块之间的磁力的磁力检测部件; 以及用于控制第一磁性模块和第二磁性模块之间的磁力的磁力控制器，其中第一磁性模块包括旋转地安装的第一磁体，以及设置在第一磁性模块的第二磁性模块的两侧的第二磁体和第三磁体 并且磁力控制器旋转第一磁体，以便控制第一磁性模块和第二磁性模块之间的磁力。

公开(公告)号：US08259049B2

公开(公告)日：2012-09-04

申请号：US12976513

申请日：2010-12-22

Applicant: Dong-kyu Kim

Inventor： Dong-kyu Kim

IPC: G09G3/36 ,  G02F1/1343 ,  G02F1/1337 ,  G02F1/1339

CPC classification number: G09G3/3659 ,  G02F1/13624 ,  G02F1/1393 ,  G02F2001/134345 ,  G09G3/3696 ,  G09G2300/0443 ,  G09G2320/028

Abstract: A liquid crystal display (LCD) which can provide uniform vertical and horizontal visibility while improving lateral visibility is provided. The LCD includes a first insulating substrate, first and second gate lines which are formed on the first insulating substrate, and a data line which is insulated from the first and second gate lines and intersects the first and second gate lines. The LCD also includes first and second thin film transistors (TFTs) which are formed in each pixel and are connected to the first and second gate lines, respectively, and to the data line, first sub-pixel electrodes which are connected to the first TFT, and a second sub-pixel electrode which is separated from the first sub-pixel electrodes by predetermined gaps and is connected to the second TFT. The LCD includes a second insulating substrate which faces the first insulating substrate, a common electrode which is formed on the second insulating substrate and comprises a plurality of domain dividers, and a liquid crystal layer which is interposed between the first and second insulating substrates, wherein a display region of the second sub-pixel electrode is divided into 4 domain groups by the domain dividers, and the 4 domain groups have substantially the same area.

Abstract translation: 提供了一种能够提供均匀的垂直和水平可视性同时提高侧向可视性的液晶显示器（LCD）。 LCD包括第一绝缘基板，形成在第一绝缘基板上的第一和第二栅极线以及与第一和第二栅极线绝缘并与第一和第二栅极线相交的数据线。 LCD还包括分别形成在每个像素中并分别连接到第一和第二栅极线的第一和第二薄膜晶体管（TFT），并且与数据线相连，第一和第二薄膜晶体管连接到第一TFT 以及第二子像素电极，其通过预定间隙与第一子像素电极分离并连接到第二TFT。 LCD包括面向第一绝缘基板的第二绝缘基板，形成在第二绝缘基板上并包括多个畴分隔件的公共电极以及介于第一和第二绝缘基板之间的液晶层，其中 第二子像素电极的显示区域由分割器划分为4个域组，并且4个域组具有大致相同的面积。

公开(公告)号：US07505420B2

公开(公告)日：2009-03-17

申请号：US11151302

申请日：2005-06-14

Applicant: Sang-hyun Do ,  Dong-kyu Kim ,  Hyung-jin Choi

Inventor： Sang-hyun Do ,  Dong-kyu Kim ,  Hyung-jin Choi

IPC: H04L12/26 ,  H04J3/06

CPC classification number: H04L27/2666 ,  H04L27/2665 ,  H04L27/2678 ,  H04N21/2383 ,  H04N21/4382

Abstract: An apparatus for detecting a guard interval length (type) of a transmission symbol among the structure of an orthogonal frequency division multiplexing (OFDM) system receiver, to ensure proper operation of a symbol start detector and a fast Fourier transform (FFT) window position controller, is provided. This apparatus includes an analog-to-digital converter (ADC) for converting a received OFDM signal into digital complex samples, a symbol start position detector for detecting a symbol start position with reference to information on a guard interval length among the complex samples output by the ADC, a symbol start position difference detector for detecting the difference between the symbol start position detected by the symbol start position detector and a symbol start position delayed for a predetermined symbol time, a guard interval length detector for comparing the symbol start position difference detected by the symbol start position difference detector with a predetermined guard interval decision reference value and detecting the length of the guard interval, and an FFT window position controller for shifting the FFT window position using the guard interval length detected by the guard interval length detector and the symbol start information detected by the symbol start detector, to activate an FFT at the shifted FFT window position. The lengths of various guard intervals are automatically detected in the OFDM receiver, thus performing accurate FFT window recovery.

Abstract translation: 一种用于检测正交频分复用（OFDM）系统接收机的结构中的发送符号的保护间隔长度（类型）的装置，以确保符号起始检测器和快速傅里叶变换（FFT）窗口位置控制器的适当操作 ，被提供。 该装置包括用于将接收到的OFDM信号转换为数字复数样本的模数转换器（ADC），参考从由...输出的复样本中的保护间隔长度的信息来检测符号开始位置的符号开始位置检测器 ADC，用于检测由符号开始位置检测器检测的符号开始位置与延迟了预定符号时间的符号开始位置之间的差异的符号起始位置差异检测器，用于比较检测到的符号开始位置差异的保护间隔长度检测器 通过具有预定保护间隔决定参考值的符号开始位置差值检测器，并检测保护间隔的长度;以及FFT窗口位置控制器，用于使用由保护间隔长度检测器检测到的保护间隔长度来移位FFT窗口位置， 由符号开始检测器检测的符号开始信息 ，以便在移位的FFT窗口位置激活FFT。 在OFDM接收机中自动检测各种保护间隔的长度，从而执行精确的FFT窗口恢复。

公开(公告)号：US07158476B2

公开(公告)日：2007-01-02

申请号：US10206864

申请日：2002-07-29

Applicant: Dong-kyu Kim

Inventor： Dong-kyu Kim

IPC: H04J11/00

CPC classification number: H04L27/2657 ,  H04L27/2684 ,  H04L2027/0028 ,  H04L2027/0038 ,  H04L2027/0046 ,  H04L2027/0067

Abstract: A received signal is converted into a digital signal through an A/D converter and then converted into the polar coordinate system. A synchronizer removes a frequency offset from the digital signal, the digital signal is again converted into an orthogonal coordinate system and a fast fourier transform is performed with a FFT. The digital signal is again converted into the polar coordinate system. An equalizer and a phase compensator compensate respectively a channel distortion and a phase error to the digital signal. Thus, the OFDM receiver using polar coordinate system and method thereof of the present invention can reduce the number of adders and multipliers required in a frequency synchronization, a compensation for channel influence, and a removal of remaining phase error by processing the signal in the polar coordinate system, thereby simplifying the calculation process and the receiver.

Abstract translation: 接收到的信号通过A / D转换器转换为数字信号，然后转换为极坐标系。 同步器从数字信号中去除频率偏移，数字信号再次转换为正交坐标系，并通过FFT进行快速傅里叶变换。 数字信号再次转换为极坐标系。 均衡器和相位补偿器分别补偿数字信号的通道失真和相位误差。 因此，使用本发明的极坐标系的OFDM接收机及其方法可以减少频率同步所需的加法器和乘法器的数量，对信道影响的补偿，以及通过处理极地中的信号来消除剩余的相位误差 坐标系，从而简化计算过程和接收器。

公开(公告)号：US08948667B2

公开(公告)日：2015-02-03

申请号：US13137817

申请日：2011-09-14

Applicant: Dong-kyu Kim ,  Kwon-cheol Lee

Inventor： Dong-kyu Kim ,  Kwon-cheol Lee

IPC: G03G15/01 ,  G03G15/00 ,  G03G15/16

CPC classification number: G03G15/5058 ,  G03G15/0131 ,  G03G15/161 ,  G03G15/5054 ,  G03G2215/00059 ,  G03G2215/0125 ,  G03G2215/0161

Abstract: An image forming apparatus and an auto color registration method of the same which prints a color image by single pass, the image forming apparatus including: a plurality of developing units which each develops a color image in a predetermined color; a transfer unit which transfers the color image developed by developing units to the print medium and include a transfer belt rotatably installed on a transfer path; a first detector provided in a predetermined location of the transfer belt to face the transfer belt and detects any defect from a surface of the transfer belt; a second detector provided in a predetermined location of the transfer belt to face the transfer belt and detects a test pattern of an auto color registration (ACR) error transferred to the transfer belt; and a controller which adjusts the ACR error based on data detected by the first detector and the second detector.

Abstract translation: 一种图像形成装置及其自动彩色配准方法，其通过单次打印彩色图像，所述图像形成装置包括：多个显影单元，其以预定颜色显影彩色图像; 传送单元，其将由显影单元显影的彩色图像传送到打印介质，并且包括可旋转地安装在传送路径上的转印带; 第一检测器，其设置在转印带的预定位置以面对转印带并检测来自转印带表面的任何缺陷; 第二检测器，设置在转印带的预定位置以面对转印带，并检测转印到转印带上的自动着色（ACR）误差的测试图案; 以及控制器，其基于由第一检测器和第二检测器检测到的数据来调整ACR误差。

公开(公告)号：US20070018927A1

公开(公告)日：2007-01-25

申请号：US11444185

申请日：2006-05-31

Applicant: Dong-kyu Kim

Inventor： Dong-kyu Kim

IPC: G09G3/36

CPC classification number: G09G3/3659 ,  G02F1/13624 ,  G02F1/1393 ,  G02F2001/134345 ,  G09G3/3696 ,  G09G2300/0443 ,  G09G2320/028

Abstract: A liquid crystal display (LCD) which can provide uniform vertical and horizontal visibility while improving lateral visibility is provided. The LCD includes a first insulating substrate, first and second gate lines which are formed on the first insulating substrate, and a data line which is insulated from the first and second gate lines and intersects the first and second gate lines. The LCD also includes first and second thin film transistors (TFTs) which are formed in each pixel and are connected to the first and second gate lines, respectively, and to the data line, first sub-pixel electrodes which are connected to the first TFT, and a second sub-pixel electrode which is separated from the first sub-pixel electrodes by predetermined gaps and is connected to the second TFT. The LCD includes a second insulating substrate which faces the first insulating substrate, a common electrode which is formed on the second insulating substrate and comprises a plurality of domain dividers, and a liquid crystal layer which is interposed between the first and second insulating substrates, wherein a display region of the second sub-pixel electrode is divided into 4 domain groups by the domain dividers, and the 4 domain groups have substantially the same area.

Abstract translation: 提供了一种能够提供均匀的垂直和水平可视性同时提高侧向可视性的液晶显示器（LCD）。 LCD包括第一绝缘基板，形成在第一绝缘基板上的第一和第二栅极线以及与第一和第二栅极线绝缘并与第一和第二栅极线相交的数据线。 LCD还包括分别形成在每个像素中并分别连接到第一和第二栅极线的第一和第二薄膜晶体管（TFT），并且与数据线相连，第一和第二薄膜晶体管连接到第一TFT 以及第二子像素电极，其通过预定间隙与第一子像素电极分离并连接到第二TFT。 LCD包括面向第一绝缘基板的第二绝缘基板，形成在第二绝缘基板上并包括多个畴分隔件的公共电极以及介于第一和第二绝缘基板之间的液晶层，其中 第二子像素电极的显示区域由分割器划分为4个域组，并且4个域组具有大致相同的面积。

公开(公告)号：US06853616B1

公开(公告)日：2005-02-08

申请号：US09555046

申请日：1998-11-24

Applicant: Dong-kyu Kim ,  Sang-hyun Do ,  Hyung-jin Choi

Inventor： Dong-kyu Kim ,  Sang-hyun Do ,  Hyung-jin Choi

IPC: H04J11/00 ,  H04B3/04 ,  H04L27/26

CPC classification number: H04L27/2665 ,  H04L27/2662

Abstract: An OFDM receiver for interlocking FFT window position recovery with sampling clock control, and a method thereof are provided. This method includes the steps of: extracting a pilot signal from fast-Fourier-transformed OFDM received signals, and detecting inter-pilot phase differences; averaging the detected phase differences for a symbol and normalizing the mean phase difference by dividing it into reference values corresponding to phase differences generated when FFT window errors of at least one sample exist; and simultaneously controlling the FFT window position offset using a value obtained by rounding off the normalized value, and the sampling clock offset using the difference between the round-off value and the normalized value.

Abstract translation: 提供了一种用于使FFT窗口位置恢复与采样时钟控制互锁的OFDM接收器及其方法。 该方法包括以下步骤：从快速傅里叶变换的OFDM接收信号中提取导频信号，并检测导频间的相位差; 对于符号的检测到的相位差进行平均，并将平均相位差归一化，将其分成对应于存在至少一个样本的FFT窗口误差时产生的相位差的参考值; 并且使用通过舍入归一化值而获得的值以及使用舍入值与归一化值之间的差来采样时钟偏移来同时控制FFT窗口位置偏移。