OHCI(Open Host Control Interface)作为USB主机控制器的国际标准之一,已经广泛应用于各种电子设备中。目前OHCI主要应用于高端嵌入式电子产品中,对操作系统的体系结构较为依赖,相应的驱动程序在实时性要求较高和硬件资源简单的环境中...OHCI(Open Host Control Interface)作为USB主机控制器的国际标准之一,已经广泛应用于各种电子设备中。目前OHCI主要应用于高端嵌入式电子产品中,对操作系统的体系结构较为依赖,相应的驱动程序在实时性要求较高和硬件资源简单的环境中不能直接移植与应用。为了解决此问题,需要开发独立于操作系统平台的驱动程序。通过与采用ARM7TDMI内核的LPC2478硬件平台相结合,可实现所需要的拥有USB主机功能的嵌入式应用平台。展开更多
The Wiener index is a topological index defined as the sum of distances between all pairs of vertices in a graph. It was introduced as a structural descriptor for molecular graphs of alkanes, which are trees with vert...The Wiener index is a topological index defined as the sum of distances between all pairs of vertices in a graph. It was introduced as a structural descriptor for molecular graphs of alkanes, which are trees with vertex degrees of four at the most. The terminal Wiener index is defined as the sum of distances between all pairs of pendent vertices in a graph. In this paper we investigate Wiener and terminal Wiener for graphs derived from certain operations.展开更多
文摘OHCI(Open Host Control Interface)作为USB主机控制器的国际标准之一,已经广泛应用于各种电子设备中。目前OHCI主要应用于高端嵌入式电子产品中,对操作系统的体系结构较为依赖,相应的驱动程序在实时性要求较高和硬件资源简单的环境中不能直接移植与应用。为了解决此问题,需要开发独立于操作系统平台的驱动程序。通过与采用ARM7TDMI内核的LPC2478硬件平台相结合,可实现所需要的拥有USB主机功能的嵌入式应用平台。
文摘The Wiener index is a topological index defined as the sum of distances between all pairs of vertices in a graph. It was introduced as a structural descriptor for molecular graphs of alkanes, which are trees with vertex degrees of four at the most. The terminal Wiener index is defined as the sum of distances between all pairs of pendent vertices in a graph. In this paper we investigate Wiener and terminal Wiener for graphs derived from certain operations.
