摘要:
A geographic location of a network device is determined using response delay times from internet servers used as landmarks. A coordination server provides to a client a list of area landmark servers (ALS) with known geographic locations. The client probes ALSs, measures response delays, and provides results to the coordination server. The coordination server then provides to the client a list of additional city landmark servers (CLS) within the area. The client probes the CLSs and provides results to the coordination server which then determines the geographic location of the client.
摘要:
A geographic location of a network device is determined using response delay times from internet servers used as landmarks. A coordination server provides to a client a list of area landmark servers (ALS) with known geographic locations. The client probes ALSs, measures response delays, and provides results to the coordination server. The coordination server then provides to the client a list of additional city landmark servers (CLS) within the area. The client probes the CLSs and provides results to the coordination server which then determines the geographic location of the client.
摘要:
Large numbers of commodity servers in a data center may be inexpensively interconnected using low-cost commodity network switches, a first network port on each commodity server, a second network port on each commodity server, and a traffic-aware routing module executed on each commodity server. Connecting two or more commodity servers via the first network ports on each server to a commodity network switch forms a unit. Connecting two commodity servers in different units forms a group. Each unit has a direct connection via a second network port on a commodity server in the unit to another unit. Each group may have a direct connection via a second network port on a commodity server in the group to another group. Traffic-aware routing modules executed on each commodity server determine routing of data between servers and balance traffic across the first and second ports.
摘要:
A hybrid Butterfly Cube (“BCube”) architecture is described herein. The BCube architecture is a server-centric network architectural design, and includes a plurality of servers. Each of the plurality of servers may have multiple network ports and serve not only as an end host, but also an intermediate relay node for other servers. The BCube architecture further includes a plurality of switches which are arranged in multiple levels. Each switch has a certain number of network ports for connecting to the servers. The BCube architecture provides multiple parallel paths between any two servers. A packet source routing protocol and a BCube source routing (BSR) protocol are used to determine which path is used for routing a packet between any two servers.
摘要:
A number of data center units in a data center system may be directly connected with each other via switch interfaces. The data center system is server-centric and scalable by storing routing logics (e.g., inter-data center unit logic and/or inner-data center unit logic) at each server to achieve routing, load balancing, and/or fault tolerance. Switch interfaces of the data center units, thus, may be dumb devices and a centralized router for routing data among data center units may be omitted.
摘要:
A gel film or an isolated gel film comprising sheets of graphene or chemically converted graphene at least partially separated by a dispersion medium, such as water, and arranged in a substantially planar manner to form an electrically conductive matrix.
摘要:
An apparatus comprises an implantable cardiac signal sensing circuit configured to provide a sensed depolarization signal from a ventricle and a processor. The processor includes a signal analyzer module and a tachyarrhythmia discrimination module. The signal analyzer module is configured to determine a measure of stability of ventricular (V-V) depolarization intervals using the depolarization signal, and determine a rate of change of the measure of stability. The tachyarrhythmia discrimination module is configured to detect an episode of tachyarrhythmia using the depolarization signal, determine whether the detected tachyarrhythmia is indicative of atrial tachyarrhythmia using the determined rate of change, and provide the determination to a user or process.