Low jitter digital frequency synthesizer and control thereof
    1.
    发明授权
    Low jitter digital frequency synthesizer and control thereof 有权
    低抖动数字频率合成器及其控制

    公开(公告)号:US07142823B1

    公开(公告)日:2006-11-28

    申请号:US10769205

    申请日:2004-01-29

    IPC分类号: H04B1/40

    CPC分类号: H03L7/0996 H03L7/085

    摘要: A low jitter digital frequency synthesizer includes a first counter module, a second counter module, a snapshot module, an error value generation module, and a tapped delay line. The first counter module counts intervals of M cycles of an input clock to produce a first count. The second counter module count intervals of D cycles of an output clock to produce a second count, wherein a rate of the output clock corresponds to M/D times a rate of the input clock. The snapshot module periodically takes a snapshot of the first and second counts to produce snapshots. The error value generation module generates an error value based on the snapshots. The tapped delay line module produces the output clock based on the error value.

    摘要翻译: 低抖动数字频率合成器包括第一计数器模块,第二计数器模块,快照模块,误差值生成模块和抽头延迟线。 第一计数器模块计算输入时钟的M个周期的间隔以产生第一计数。 第二计数器模块计算输出时钟的D个周期的间隔以产生第二计数,其中输出时钟的速率对应于输入时钟的速率的M / D倍。 快照模块定期拍摄第一和第二个计数的快照,以生成快照。 错误值生成模块根据快照生成错误值。 抽头延迟线模块根据误差值产生输出时钟。

    Non-volatile solid state resistive switching devices

    公开(公告)号:US10134985B2

    公开(公告)日:2018-11-20

    申请号:US11875541

    申请日:2007-10-19

    申请人: Wei Lu Sung Hyun Jo

    发明人: Wei Lu Sung Hyun Jo

    IPC分类号: H01L47/00 H01L45/00 H01L27/24

    摘要: Non-crystalline silicon non-volatile resistive switching devices include a metal electrode, a non-crystalline silicon layer and a planar doped silicon electrode. An electrical signal applied to the metal electrode drives metal ions from the metal electrode into the non-crystalline silicon layer to form a conducting filament from the metal electrode to the planar doped silicon electrode to alter a resistance of the non-crystalline silicon layer. Another electrical signal applied to the metal electrode removes at least some of the metal ions forming the conducting filament from the non-crystalline silicon layer to further alter the resistance of the non-crystalline silicon layer.

    Solvent-based methods for production of graphene nanoribbons
    7.
    发明授权
    Solvent-based methods for production of graphene nanoribbons 有权
    用于生产石墨烯纳米带的基于溶剂的方法

    公开(公告)号:US09493355B2

    公开(公告)日:2016-11-15

    申请号:US14345016

    申请日:2012-09-14

    摘要: The present invention provides methods of preparing functionalized graphene nanoribbons. Such methods include: (1) exposing a plurality of carbon nanotubes (CNTs) to an alkali metal source in the presence of an aprotic solvent to open them; and (2) exposing the opened CNTs to an electrophile to form functionalized graphene nanoribbons (GNRs). The methods may also include a step of exposing the opened CNTs to a protic solvent to quench any reactive species on them. Additional methods include preparing unfunctionalized GNRs by: (1) exposing a plurality of CNTs to an alkali metal source in the presence of an aprotic solvent to open them; and (2) exposing the opened CNTs to a protic solvent to form unfunctionalized GNRs.

    摘要翻译: 本发明提供了制备官能化石墨烯纳米带的方法。 这些方法包括:(1)在非质子溶剂的存在下将多个碳纳米管(CNT)暴露于碱金属源以将其打开; 和(2)将开放的CNT暴露于亲电子试剂以形成官能化的石墨烯纳米带(GNR)。 所述方法还可以包括将开放的CNT暴露于质子溶剂以淬灭其上的任何反应性物质的步骤。 另外的方法包括:通过以下步骤制备未官能化的GNR:(1)在非质子溶剂存在下将多个CNT暴露于碱金属源以打开它们; 和(2)将开放的CNT暴露于质子溶剂以形成未官能化的GNR。

    METHODS AND APPARATUS FOR INDIVIDUALLY OPTIMIZING UNIFORM CONTRAST ENHANCEMENTS IN COMPUTED TOMOGRAPHY IMAGING
    8.
    发明申请
    METHODS AND APPARATUS FOR INDIVIDUALLY OPTIMIZING UNIFORM CONTRAST ENHANCEMENTS IN COMPUTED TOMOGRAPHY IMAGING 有权
    在计算机图像成像中单独优化均匀对比增强的方法和装置

    公开(公告)号:US20150324979A1

    公开(公告)日:2015-11-12

    申请号:US14710052

    申请日:2015-05-12

    IPC分类号: G06T7/00 G06T11/00

    摘要: A method is provided for optimizing a contrast injection function for CT imaging. The method includes injecting, with an injector pump, a test bolus of a contrast agent into a subject. The method also includes computing, on a processor, an impulse enhancement function. The method also includes determining, on a processor, a target enhancement function for a region of interest. The method also includes determining, with a processor, a plurality of parameters for a functional form for a contrast injection function in a time domain. The method also includes determining for the contrast injection function a constraint. The method also includes determining, with a processor, particular values for the plurality of parameters, which satisfy the constraint and minimize a difference between a value of an enhancement function and the target enhancement function computed in the time domain at discrete time periods without use of a Fourier transform.

    摘要翻译: 提供了一种用于优化CT成像的造影剂注射功能的方法。 该方法包括用注射器泵将造影剂的测试团注入受试者。 该方法还包括在处理器上计算脉冲增强功能。 该方法还包括在处理器上确定感兴趣区域的目标增强功能。 该方法还包括使用处理器确定用于时域中的对比度注入功能的功能形式的多个参数。 该方法还包括确定对比度注入功能的约束。 该方法还包括使用处理器确定满足约束的多个参数的特定值,并且使离散时间段内在增强函数的值和在时域中计算的目标增强函数之间的差最小化,而不使用 傅立叶变换。

    Content associative caching method for web applications
    9.
    发明授权
    Content associative caching method for web applications 有权
    Web应用程序的内容关联缓存方法

    公开(公告)号:US08793307B2

    公开(公告)日:2014-07-29

    申请号:US12695996

    申请日:2010-01-28

    IPC分类号: G06F15/16

    CPC分类号: H04L67/2842

    摘要: A cache logically disposed in a communication path between a client and a server receives a request for a content item and, in response thereto, requests from the server header information concerning the content item and an initial portion of data that makes up the content item. The cache then computes a first hashing value from the header information and a second hashing value from the initial portion of data. A content identifier is created by combining the first hashing value and the second hashing value. Using the content identifier, the cache determines whether a copy of the content item is stored by the cache; and, if so provides same to the client. Otherwise, the cache requests the content item from the server and, upon receipt thereof, provides it to the client.

    摘要翻译: 逻辑上设置在客户端和服务器之间的通信路径中的高速缓存器接收对内容项目的请求,并响应于此,来自服务器的关于内容项目的信息的请求以及组成内容项的数据的初始部分。 然后,高速缓存从头信息计算第一散列值,并从数据的初始部分计算第二哈希值。 通过组合第一哈希值和第二散列值来创建内容标识符。 使用内容标识符,缓存确定高速缓存是否存储内容项的副本; 如果是这样,给客户端一样。 否则,高速缓存从服务器请求内容项,并在接收到该内容时将其提供给客户端。

    Method and device for rejecting redundantly retransmitted SIP messages
    10.
    发明授权
    Method and device for rejecting redundantly retransmitted SIP messages 失效
    用于拒绝冗余重传SIP消息的方法和设备

    公开(公告)号:US08792483B2

    公开(公告)日:2014-07-29

    申请号:US11868990

    申请日:2007-10-09

    IPC分类号: H04L12/66

    摘要: A method for rejecting received SIP messages which are redundantly retransmitted used in a Session Initiation Protocol (SIP) application architecture. In one embodiment, the method comprises: forwarding all the messages transmitted from a SIP application server to a SIP terminal, and dropping all the received SIP messages redundantly retransmitted from the SIP terminal to the SIP application server according to the transmission direction of said SIP messages; and correspondingly replying to the dropped SIP messages according to the message type thereof. The present invention also provides a corresponding retransmission rejection device and a network device comprising the same, and further provides a method and device for rapidly rejecting redundantly retransmitted SIP messages in the case where the memory space is limited. The present invention can be applied to a network device such as a SIP stateless proxy at a front end of a SIP application server cluster.

    摘要翻译: 一种用于拒绝在会话发起协议(SIP)应用架构中使用的冗余重传的接收到的SIP消息的方法。 在一个实施例中,所述方法包括:将从SIP应用服务器发送的所有消息转发到SIP终端,并且根据所述SIP消息的传输方向将从SIP终端冗余重发的所有接收的SIP消息转发到SIP应用服务器 ; 并根据其消息类型相应地回复丢弃的SIP消息。 本发明还提供了相应的重传拒绝设备和包括该重传拒绝设备的网络设备,并且还提供了在存储器空间有限的情况下快速拒绝冗余重传的SIP消息的方法和设备。 本发明可以应用于SIP应用服务器集群的前端的诸如SIP无状态代理之类的网络设备。