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    • 17. 发明申请
    • System and Method for Embedded Java Memory Footprint Performance Improvement
    • 嵌入式Java存储器脚印性能改进的系统和方法
    • US20080098265A1
    • 2008-04-24
    • US11967142
    • 2007-12-29
    • Janet DmitrovichPhilip LangdaleJames RobbinsWilliam Tracey
    • Janet DmitrovichPhilip LangdaleJames RobbinsWilliam Tracey
    • G11C29/04G06F9/45
    • G06F12/0866G06F9/45516G06F2212/2022
    • A system and method are provided to allow demand loading and discarding of Java executable image (JXE) files. The virtual machine allocates an address space for a requested JXE program. The read-only portion of the JXE file is memory mapped from its nonvolatile location to the allocated memory space using read-only mapping and the read/write section of the JXE file are loaded into memory. When a page of the JXE program is needed, a page fault occurs if the read-only portion has not been loaded into memory. The operating system's page fault handler retrieves the needed page(s) from the nonvolatile storage location based upon the mapping data that resulted from the previously performed memory mapping. Because the read-only section of the JXE file is memory mapped using read-only mapping, the operating system's paging process is free to discard previously loaded memory pages that contain read-only portions of the JXE file.
    • 提供了一种系统和方法来允许需求加载和丢弃Java可执行映像(JXE)文件。 虚拟机为所请求的JXE程序分配一个地址空间。 使用只读映射将JXE文件的只读部分从其非易失性位置映射到分配的存储空间,并将JXE文件的读/写部分加载到内存中。 当需要JXE程序的页面时,如果只读部分尚未加载到内存中,则会发生页面错误。 操作系统的页面错误处理器基于从先前执行的存储器映射产生的映射数据,从非易失性存储位置检索所需的页面。 由于JXE文件的只读部分是使用只读映射进行内存映射,因此操作系统的分页过程可以放弃先前加载的包含JXE文件只读部分的内存页面。
    • 18. 发明申请
    • Differential GPS corrections using virtual stations
    • 使用虚拟站进行差分GPS校正
    • US20060282216A1
    • 2006-12-14
    • US11506300
    • 2006-08-18
    • James Robbins
    • James Robbins
    • G01C21/00
    • G01C15/00G01C21/28G01S19/07G01S19/258G01S19/41G01S19/43
    • Method and apparatus for providing GPS pseudorange correction and carrier phase correction information for navigation or surveying activities over a selected geographic region S of arbitrary size. In a navigation mode, a virtual reference station (VRS), positioned near a selected location L, receives differential GPS (DGPS) correction signals, translates these signals into a selected format, and broadcasts this DGPS information in this format for use by a local user. In a survey mode, the VRS receives corrected GPS information, translates this information into a selected format and broadcasts this translated and corrected GPS information and the VRS location, for use by a mobile station in forming a baseline vector from the GPS mobile station to the VRS location.
    • 提供GPS伪距校正和用于导航或测量活动的载波相位校正信息的任意大小的选定地理区域S的方法和装置。 在导航模式中,位于选定位置L附近的虚拟参考站(VRS)接收差分GPS(DGPS)校正信号,将这些信号转换成选定的格式,并以此格式广播此DGPS信息以供本地使用 用户。 在测量模式中,VRS接收校正后的GPS信息,将该信息转换成所选择的格式并广播该翻译和校正的GPS信息和VRS位置,供移动台用于从GPS移动台形成基线向量 VRS位置。