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111 条记录 (耗时 0.05 秒)

    Aziridine compounds, methods of preparation and reactions thereof
    81.
    发明授权
    Aziridine compounds, methods of preparation and reactions thereof 失效
    氮丙啶化合物，制备方法及其反应

    公开(公告)号：US5789599A

    公开(公告)日：1998-08-04

    申请号：US239097

    申请日：1994-05-06

    申请人： Franklin A. Davis ,  Ping Zhou ,  Gaddampally Venkat Reddy

    发明人： Franklin A. Davis ,  Ping Zhou ,  Gaddampally Venkat Reddy

    IPC分类号： C07C315/02 ,  C07C317/46 ,  C07C319/20 ,  C07C323/41 ,  C07D203/08 ,  C07D203/24

    CPC分类号： C07D203/08 ,  C07C315/02 ,  C07C319/20 ,  C07D203/24

    摘要： Novel N-sulfinyl-2-carboxyaziridine compounds and novel N-hydrogen-2-hydroxymethylaziridine compounds are provided. The asymmetric synthesis of N-sulfinylaziridines is readily accomplished in high diastereomeric purity and good yield by the Darzens-type reaction of the metal enolate of an .alpha.-haloester and an enantiopure sulfinimine. Ring-opening of these aziridines affords .alpha.-amino acids and the otherwise difficult to prepare syn-.beta.-hydroxy-.alpha.-amino acids, both key structural units found in many bioactive materials. The N-sulfinyl radical may be selectively removed from the novel aziridine compounds by treatment with acid or base. Alternatively, the N-sulfinyl radical may be oxidized to provide the corresponding N-sulfonyl-aziridine, or reduced to form the corresponding 1H-2-hydroxymethylaziridine, either of which may subsequently be ring-opened to provide precursors to bioactive compounds.

    摘要翻译： 提供新的N-亚磺酰基-2-羧基氮丙啶化合物和新的N-氢-2-羟基甲基氮丙啶化合物。 N-亚氨基氮丙啶的不对称合成通过α-卤代醇金属烯醇化物和对映异构体亚硫酰亚胺的Darzens型反应，以高非对映纯度和良好的收率容易地实现。 这些氮丙啶的开环提供α-氨基酸，否则难以制备顺式-β-羟基-α-氨基酸，这是许多生物活性材料中发现的关键结构单元。 通过用酸或碱处理可以从新的氮丙啶化合物中选择性地除去N-亚硫酰基。 或者，N-亚硫酰基可被氧化以提供相应的N-磺酰基 - 氮丙啶，或还原形成相应的1H-2-羟甲基氮丙啶，其中之一可随后被开环以提供生物活性化合物的前体。

    Synchronously debugging a software program using a plurality of virtual machines
    83.
    发明授权
    Synchronously debugging a software program using a plurality of virtual machines 失效
    使用多个虚拟机同步调试软件程序

    公开(公告)号：US08612937B2

    公开(公告)日：2013-12-17

    申请号：US13217826

    申请日：2011-08-25

    申请人： Clark A. Dudek ,  Kobina K. Inkumsah ,  David B. Roberts ,  Adrian X. Rodriguez ,  Ping Zhou

    发明人： Clark A. Dudek ,  Kobina K. Inkumsah ,  David B. Roberts ,  Adrian X. Rodriguez ,  Ping Zhou

    IPC分类号： G06F9/44

    CPC分类号： G06F9/45558 ,  G06F11/3644 ,  G06F11/366 ,  G06F2009/45591

    摘要： Methods, apparatuses, and computer program products for synchronously debugging a software program using a plurality of virtual machines are provided. Embodiments include controlling, by a master debugging module operating on a first virtual machine, execution of the software program within the first virtual machine; controlling, by a slave debugging module operating on a second virtual machine, execution of the software program within the second virtual machine including delaying execution of the software program within the second virtual machine relative to the execution of the software program within the first virtual machine; detecting, by the master debugging module, an error in the execution of the software program within the first virtual machine; and in response to the detection of the error, capturing, by a hypervisor, a snapshot of the second virtual machine.

    摘要翻译： 提供了用于使用多个虚拟机同步调试软件程序的方法，装置和计算机程序产品。 实施例包括通过在第一虚拟机上操作的主调试模块来控制第一虚拟机内的软件程序的执行; 通过在第二虚拟机上操作的从属调试模块来控制第二虚拟机内的软件程序的执行，包括相对于第一虚拟机内的软件程序的执行延迟第二虚拟机内的软件程序的执行; 由所述主调试模块检测所述第一虚拟机内的所述软件程序的执行中的错误; 并且响应于错误的检测，由管理程序捕获第二虚拟机的快照。

    ACCESS CIRCUIT TEST FOR TRANSFER ENGINEERING
    86.
    发明申请
    ACCESS CIRCUIT TEST FOR TRANSFER ENGINEERING 有权
    用于转移工程的访问电路测试

    公开(公告)号：US20100034099A1

    公开(公告)日：2010-02-11

    申请号：US12527808

    申请日：2008-01-18

    申请人： Ping Zhou ,  Andrew D. Chattell ,  Mark Hockly

    发明人： Ping Zhou ,  Andrew D. Chattell ,  Mark Hockly

    IPC分类号： H04L12/26

    CPC分类号： H04M3/30 ,  H04M3/007 ,  H04M3/2209 ,  H04M2201/18

    摘要： A test system for testing a pair of telecommunications access networks, e.g. as part of transfer engineering. The system comprises a test head for connection, via an access arrangement, to first and second access networks. In a first phase, the access arrangement is arranged to connect the test head to the first access network for sending a first request from the tester to, for example, a CLI server via the first access network. The first request comprises a parameter associated with a user line. The tester is arranged to receive in response to the first request a first identifier from the server. In a second phase, the access arrangement is arranged to connect the test head to the second access network for sending a second request from the test head through the second access network to, for example, a CLI server. The second request also comprises the parameter. The tester is arranged to receive, in response to the second request, a second identifier from the target server and is arranged to carry out a comparison operation involving the first and second identifiers received in response to the two requests. A mismatch can indicate a fault or misconnection in either access network or a problem with network configuration data.

    摘要翻译： 用于测试一对电信接入网络的测试系统，例如。 作为转移工程的一部分。 该系统包括用于经由接入装置连接到第一和第二接入网络的测试头。 在第一阶段中，访问装置被布置成将测试头连接到第一接入网络，用于经由第一接入网络将来自测试者的第一请求发送到例如CLI服务器。 第一请求包括与用户线相关联的参数。 测试器被安排为响应于第一请求接收来自服务器的第一标识符。 在第二阶段中，访问装置被布置成将测试头连接到第二接入网络，用于通过第二接入网络将测试头的第二请求发送到例如CLI服务器。 第二个请求也包括参数。 所述测试器被安排为响应于所述第二请求从所述目标服务器接收第二标识符，并且被布置为执行涉及响应于所述两个请求而接收到的所述第一和第二标识符的比较操作。 不匹配可以指示任一接入网络中的故障或连接错误或网络配置数据的问题。

    Joint fault detection
    88.
    发明授权
    Joint fault detection 有权
    联合故障检测

    公开(公告)号：US07512216B2

    公开(公告)日：2009-03-31

    申请号：US10593307

    申请日：2005-03-09

    申请人： Ping Zhou ,  Andrew D Chattell

    发明人： Ping Zhou ,  Andrew D Chattell

    IPC分类号： H04M1/24 ,  H04M3/08 ,  H04M3/22

    CPC分类号： H04M3/305 ,  H04M3/08

    摘要： A method and apparatus for detecting a fault in a joint connecting sections of an electrical transmission line together are disclosed. Previously known methods for detecting joint faults require a visual inspection of the joint or testing the transmission line using sophisticated, expensive equipment. This manual testing is expensive and inefficient. In the proposed method, a fault in a joint (301) connecting sections of an electrical transmission line (107) together is detected by measuring the resistance to current flowing through the joint (301) in one and the other directions along said electrical transmission line (107) and detecting a fault in the joint (301) if the measured resistance differs substantially in said one and the other directions. The method has particular utility in relation to low power transmission lines such as telephone lines.

    摘要翻译： 公开了一种用于检测电传输线的接头连接部分中的故障的方法和装置。 用于检测关节缺损的以前已知的方法需要使用复杂且昂贵的设备来目视检查关节或测试传输线。 这种手动测试是昂贵且效率低下的。 在所提出的方法中，通过沿沿着所述传输线的一个方向和另一个方向测量流过接头（301）的电流的电阻来检测电传输线（107）的连接部分（301）的接头（301）中的故障 （107），并且如果所测量的电阻在所述一个和其它方向上显着不同，则检测接头（301）中的故障。 该方法对于诸如电话线路的低功率传输线路具有特别的用途。