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    • 1. 发明授权
    • Method of incremental statistical static timing analysis based on timing yield
    • 基于定时收益的增量统计静态时序分析方法
    • US08046725B2
    • 2011-10-25
    • US12475545
    • 2009-05-31
    • Jinwook KimYoung Hwan KimWook Kim
    • Jinwook KimYoung Hwan KimWook Kim
    • G06F9/455G06F17/50
    • G06F17/5031G06F2217/84
    • Provided is a method of incremental SSTA (statistical static timing analysis) of a digital circuit, the method including a first step in which, when a gate is replaced in the digital circuit, delay propagation is performed from a node of a replaced gate to a virtual sink node based on SSTA; a second step in which, if a changed value of a gate timing yield at each gate which propagates delay toward the virtual sink node is smaller than a predetermined threshold value, delay propagation with respect to a fanout gate of the corresponding gate is stopped; and a third step in which, when a delay with respect to the node of the replaced gate is propagated to the virtual sink node, a new timing yield is calculated at the virtual sink node.
    • 提供了数字电路的增量SSTA(统计静态时序分析)的方法,该方法包括第一步骤,其中当在数字电路中替换门时,从更换的门的节点执行延迟传播 基于SSTA的虚拟汇聚节点; 第二步骤,如果在向虚拟汇聚节点传播延迟的每个门的门定时收益的改变值小于预定阈值,则停止相对于相应门的扇出门的延迟传播; 以及第三步骤,当相对于所替换的门的节点的延迟传播到虚拟宿节点时,在虚拟宿节点处计算新的定时收益。
    • 7. 发明申请
    • Rear projection screen
    • 背投屏幕
    • US20060050380A1
    • 2006-03-09
    • US11219942
    • 2005-09-06
    • Kyung-Joon YoonHan-Pil KimGeun-Hee LeeWook KimSeok-Joo Byun
    • Kyung-Joon YoonHan-Pil KimGeun-Hee LeeWook KimSeok-Joo Byun
    • G03B21/56
    • G03B21/625
    • The present invention relates to a rear projection screen (1) for allowing an observer to view an image at a front side by receiving light projected at a rear side. The rear projection screen comprises a transparent plate (3); an optical sheet (8; 8′) which is hot-pressed on a rear surface of the transparent plate (3) and includes a plurality of fine prisms (5; 5′) formed from side to side and parallel to one another to refract the light and guide the refracted light to the front side, each fine prism protruding to the rear side; a diffusion film (20) which is bonded to a front surface of the transparent plate (3) and including a transparent film (2) and diffusion layers (6) formed on front and rear surfaces of the transparent film to omnidirectionally disperse and diffuse the light refracted through the optical sheet (8; 8′); and light-shielding printed layers (4) which are formed on an upper surface of the diffusion layer (6) to be horizontally parallel to one another and face portions between the fine prisms (5; 5′) of the optical sheet (8; 8′). According to the rear projection screen of the present invention so configured, there is no reflected image on a surface on the side of an observer even under a bright environment such as the presence of sunlight, and a extremely precise color image with a high black level can be obtained. Further, a large-sized screen with less light loss can be manufactured at a low cost by first refracting light emitted from a projector through a fine prism optical sheet and then diffusing the refracted light.
    • 本发明涉及一种背投屏幕(1),用于允许观察者通过接收在后侧投射的光来观看正面的图像。 背投屏幕包括透明板(3); 在所述透明板(3)的后表面上被热压的光学片(8; 8'),并且包括多个彼此形成并且彼此平行的折射的细小棱镜(5; 5') 将折射光引导到前侧,每个细棱镜向后突出; 粘合到透明板(3)的前表面并且包括形成在透明膜的前表面和后表面上的透明膜(2)和扩散层(6)的扩散膜(20)以全面分散和扩散 光折射通过光学片(8; 8'); 以及形成在所述扩散层(6)的上表面上彼此水平平行并且在所述光学片(8; ...)的所述精细棱镜(5; 5')之间的面对部分的遮光印刷层(4) 8')。 根据如此构造的本发明的背投屏幕,即使在诸如阳光的存在的明亮环境下,也不存在观察者侧的表面上的反射图像,并且具有高黑色水平的极精确的彩色图像 可以获得。 此外,通过首先通过精细棱镜光学片折射从投影仪发出的光,然后使折射光扩散,可以以低成本制造具有更少光损失的大尺寸屏幕。
    • 9. 发明授权
    • RF power divider
    • 射频功率分配器
    • US6054906A
    • 2000-04-25
    • US40160
    • 1998-03-17
    • Wook Kim
    • Wook Kim
    • H01P5/16H01P5/19H03H7/48H04B1/04H01P5/12
    • H04B1/0458H03H7/48
    • An RF power divider is provided for use in a UHF-band high-power amplifier of a radio transmitter. The RF power divider includes: a single input port; first and second output ports; a first microstrip line coupled to the input port; first and second coils coupled in parallel to an output side of the first microstrip line; a second microstrip line coupled between an output side of the first coil and the first output port; a third microstrip line coupled between an output side of the second coil and the second output port; a first capacitor coupled between a ground and a contact point of the first microstrip line and the first and second coils; a resistor coupled between a contact point of the first coil and the second microstrip line, and a contact point of the second coil and the third microstrip line; and a second capacitor coupled in parallel to the resistor. Accordingly, the present invention provides a Wilkinson power divider implemented in a concentrated integer equivalent circuit, in which .lambda./4 lines are formed by the coils and the capacitors being lumped elements instead of microstrip lines.
    • 提供RF功率分配器用于无线电发射机的UHF频带大功率放大器。 RF功率分配器包括:单个输入端口; 第一和第二输出端口; 耦合到所述输入端口的第一微带线; 第一和第二线圈并联耦合到第一微带线的输出侧; 耦合在所述第一线圈的输出侧和所述第一输出端口之间的第二微带线; 耦合在所述第二线圈的输出侧和所述第二输出端口之间的第三微带线; 耦合在所述第一微带线和所述第一和第二线圈的接地点和接触点之间的第一电容器; 耦合在所述第一线圈的接触点和所述第二微带线之间的电阻器,以及所述第二线圈和所述第三微带线的接触点; 以及与电阻器并联耦合的第二电容器。 因此,本发明提供了一种在集中整数等效电路中实现的Wilkinson功率分配器,其中λ/ 4线由线圈形成,电容器是集中元件而不是微带线。
    • 10. 发明授权
    • Low pass filter for suppressing harmonic of radio transmitter
    • 用于抑制无线电发射机谐波的低通滤波器
    • US5893026A
    • 1999-04-06
    • US777763
    • 1996-12-30
    • Wook Kim
    • Wook Kim
    • H04B1/04H03H7/01
    • H03H7/1783H03H7/0115H03H2001/0085H04B1/04
    • A low pass filter capable of passing a radio paging signal of good quality through suppressing harmonic in a radio paging transmitter. The low pass filter of the radio paging transmitter, comprising: a first filter of a .pi. type for suppressing harmonic of a radio paging signal outputted, which is connected to an output terminal of the radio paging transmitter; and, a second filter for suppressing second and third harmonic or more of the radio paging signal, which is connected between the first filter and an antenna and comprised with multistage plane panel capacitors and parallel inductance and capacitors connected between the plane panel capacitors.
    • 一种低通滤波器,其能够通过抑制无线寻呼发射机中的谐波来传递质量良好的无线寻呼信号。 无线寻呼发射机的低通滤波器包括:用于抑制输出的无线寻呼信号的谐波的pi型的第一滤波器,其连接到无线寻呼发射机的输出端; 以及用于抑制第二和第三谐波或更多的无线寻呼信号的第二滤波器,其连接在第一滤波器和天线之间,并且包括连接在平面面板电容器之间的多级平面面板电容器和并联电感和电容器。