Patent•
Open platform architecture for shared resource access management
28 Jun 2002-
TL;DR: In this article, the authors present an open platform architecture and methods for shared resource access management, where a redirection module in kernel space receives requests for access to resources from applications in user space.
Abstract: An open platform architecture and methods for shared resource access management are provided. A redirection module in kernel space receives requests for access to resources from applications in user space. The redirection module routes signals representative of the received requests to a device driver interface in user space. Components of the device driver interface include resource management modules and device drivers that correspond to available resources. The resource management modules generate queries to the device drivers regarding availability of the requested resources. Upon receipt of resource status information from the device drivers, components of the device driver interface generate schedules for granting access to the requested resources. Further, the device driver interface components control access to the resources in accordance with the generated schedules including issuing responses to the requesting applications and the device drivers of the requested resources.
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Patent•
24 Oct 2002TL;DR: In this article, the authors present a safety control system for vehicles, which includes, a communication device having at least one of an input accessible from within the vehicle and an output communicated within a vehicle, and a controller communicated with the sensor and the communication device to selectively suppress one of said input and said output in response to a sensed parameter of a vehicle's condition being outside of a threshold.
Abstract: According to one aspect of one embodiment of the present invention, a safety control system for vehicles, includes, a communication device having at least one of an input accessible from within the vehicle and an output communicated within the vehicle, at least one sensor operable to sense at least one condition related to vehicle operation, and a controller communicated with the sensor and the communication device to selectively suppress at least one of said input and said output in response to a sensed parameter of said at least one condition being outside of a threshold. When an input is suppressed, the driver is prevented from accessing or inputting information into the communication device. When an output is suppressed, communication between the device and the driver of a vehicle is suppressed to, among other things, avoid distracting the driver during certain driving situations or conditions relating to the driver, vehicle and/or environment.
476 citations
Patent•
06 Nov 2003TL;DR: In this paper, a distributed system providing scalable methodology for real-time control of server pools and data centers is described, the method comprises steps of: providing a resource policy specifying allocation of resources amongst the plurality of programs; determining resources available at the majority of machines; detecting requests for resources by each of the programs running on each plurality of machines.
Abstract: A distributed system providing scalable methodology for real-time control of server pools and data centers is described. In one embodiment, a method is described for regulating resource usage by a plurality of programs running on a plurality of machines, the method comprises steps of: providing a resource policy specifying allocation of resources amongst the plurality of programs; determining resources available at the plurality of machines; detecting requests for resources by each of the plurality of programs running on each of the plurality of machines; periodically exchanging resource information amongst the plurality of machines, the resource information including requests for resources and resource availability at each of the plurality of machines; and at each of the plurality of machines, allocating resources to each program based upon the resource policy and the resource information.
332 citations
Patent•
12 Apr 2010
TL;DR: The Wireless Integrated Network Sensor Next Generation (WINS NG) as mentioned in this paper nodes provide distributed network and Internet access to sensors, controls, and processors that are deeply embedded in equipment, facilities, and the environment.
Abstract: The Wireless Integrated Network Sensor Next Generation (WINS NG) nodes provide distributed network and Internet access to sensors, controls, and processors that are deeply embedded in equipment, facilities, and the environment. The WINS NG network is a new monitoring and control capability for applications in transportation, manufacturing, health care, environmental monitoring, and safety and security. The WINS NG nodes combine microsensor technology, low power distributed signal processing, low power computation, and low power, low cost wireless and/or wired networking capability in a compact system. The WINS NG networks provide sensing, local control, remote reconfigurability, and embedded intelligent systems in structures, materials, and environments.
301 citations
Patent•
31 Oct 2007TL;DR: In this article, a system and method for maintaining functionality of software includes initially providing the vehicle with software resident on computer-readable medium to enable it to operate and interact with components thereof and updating the vehicle software by receiving a wireless transmission from one or more remote locations.
Abstract: System and method for maintaining functionality of software includes initially providing the vehicle with software resident on computer-readable medium to enable it to operate and interact with components thereof and updating the vehicle software by receiving a wireless transmission from one or more remote locations, e.g., a location maintained by a dealer or manufacturer of the vehicle. The software may be diagnostic software for a diagnostic module which diagnoses operability of components of the vehicle. Different remote locations may be responsible for different portions of the vehicle-resident software and may therefore provide different software upgrades, based on need.
256 citations
Patent•
21 May 2004
TL;DR: In this paper, a data storage and retrieval device and method is described, which includes at least one magnetic storage medium configured to store target data and at least a re-configurable logic device comprising an FPGA coupled to the at least 1 magnetic medium and configured to read a continuous stream of target data therefrom, having been configured with a template or as desired to fit the type of search and data being searched.
Abstract: A data storage and retrieval device and method is disclosed. The device includes at least one magnetic storage medium configured to store target data and at least one re-configurable logic device comprising an FPGA coupled to the at least one magnetic storage medium and configured to read a continuous stream of target data therefrom, having been configured with a template or as otherwise desired to fit the type of search and data being searched. The re-configurable logic device is configured to receive at least one search inquiry in the form of a data key and to determine a match between the data key and the target data as it is being read from the at least one magnetic storage medium. This device and method can perform a variety of searches on the target data including without limitation exact and approximate match searches, sequence match searches, image match searches and data reduction searches. This device and method may be provided as part of a stand-alone computer system, embodied in a network attached storage device, or can otherwise be provided as part of a computer LAN or WAN. In addition to performing search and data reduction operations, this device may also be used to perform a variety of other processing operations including encryption, decryption, compression, decompression, and combinations thereof.
255 citations
References
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09 Dec 2002
TL;DR: Reference Broadcast Synchronization (RBS) as discussed by the authors is a scheme in which nodes send reference beacons to their neighbors using physical-layer broadcasts, and receivers use their arrival time as a point of reference for comparing their clocks.
Abstract: Recent advances in miniaturization and low-cost, low-power design have led to active research in large-scale networks of small, wireless, low-power sensors and actuators. Time synchronization is critical in sensor networks for diverse purposes including sensor data fusion, coordinated actuation, and power-efficient duty cycling. Though the clock accuracy and precision requirements are often stricter than in traditional distributed systems, strict energy constraints limit the resources available to meet these goals.We present Reference-Broadcast Synchronization, a scheme in which nodes send reference beacons to their neighbors using physical-layer broadcasts. A reference broadcast does not contain an explicit timestamp; instead, receivers use its arrival time as a point of reference for comparing their clocks. In this paper, we use measurements from two wireless implementations to show that removing the sender's nondeterminism from the critical path in this way produces high-precision clock agreement (1.85 ± 1.28μsec, using off-the-shelf 802.11 wireless Ethernet), while using minimal energy. We also describe a novel algorithm that uses this same broadcast property to federate clocks across broadcast domains with a slow decay in precision (3.68 ± 2.57μsec after 4 hops). RBS can be used without external references, forming a precise relative timescale, or can maintain microsecond-level synchronization to an external timescale such as UTC. We show a significant improvement over the Network Time Protocol (NTP) under similar conditions.
2,537 citations
TL;DR: This paper describes a self-organizing, multihop, mobile radio network which relies on a code-division access scheme for multimedia support that provides an efficient, stable infrastructure for the integration of different types of traffic in a dynamic radio network.
Abstract: This paper describes a self-organizing, multihop, mobile radio network which relies on a code-division access scheme for multimedia support. In the proposed network architecture, nodes are organized into nonoverlapping clusters. The clusters are independently controlled, and are dynamically reconfigured as the nodes move. This network architecture has three main advantages. First, it provides spatial reuse of the bandwidth due to node clustering. Second, bandwidth can be shared or reserved in a controlled fashion in each cluster. Finally, the cluster algorithm is robust in the face of topological changes caused by node motion, node failure, and node insertion/removal. Simulation shows that this architecture provides an efficient, stable infrastructure for the integration of different types of traffic in a dynamic radio network.
1,695 citations
TL;DR: A multi-cluster, multi-hop packet radio network architecture for wireless adaptive mobile information systems is presented that supports multimedia traffic and relies on both time division and code division access schemes.
Abstract: A multi-cluster, multi-hop packet radio network architecture for wireless adaptive mobile information systems is presented. The proposed network supports multimedia traffic and relies on both time division and code division access schemes. This radio network is not supported by a wired infrastructure as conventional cellular systems are. Thus, it can be instantly deployed in areas with no infrastructure at all. By using a distributed clustering algorithm, nodes are organized into clusters. The clusterheads act as local coordinators to resolve channel scheduling, perform power measurement/control, maintain time division frame synchronization, and enhance the spatial reuse of time slots and codes. Moreover, to guarantee bandwidth for real time traffic, the architecture supports virtual circuits and allocates bandwidth to circuits at call setup time. The network is scalable to large numbers of nodes, and can handle mobility. Simulation experiments evaluate the performance of the proposed scheme in static and mobile environments.
1,610 citations
03 Dec 1995
TL;DR: The prototype exokernel system implemented here is at least five times faster on operations such as exception dispatching and interprocess communication, and allows applications to control machine resources in ways not possible in traditional operating systems.
Abstract: Traditional operating systems limit the performance, flexibility, and functionality of applications by fixing the interface and implementation of operating system abstractions such as interprocess communication and virtual memory. The exokernel operating system architecture addresses this problem by providing application-level management of physical resources. In the exokernel architecture, a small kernel securely exports all hardware resources through a low-level interface to untrusted library operating systems. Library operating systems use this interface to implement system objects and policies. This separation of resource protection from management allows application-specific customization of traditional operating system abstractions by extending, specializing, or even replacing libraries. We have implemented a prototype exokemel operating system. Measurements show that most primitive kernel operations (such as exception handling and protected control transfer) are ten to 100 times faster than in Ultrix, a mature monolithic UNIX operating system. In addition, we demonstrate that an exokernel allows applications to control machine resources in ways not possible in traditional operating systems. For instance, virtual memory and interprocess communication abstractions are implemented entirely within an application-level library. Measurements show that application-level virtual memory and interprocess communication primitives are five to 40 times faster than Ultrix's kernel primitives. Compared to state-of-the-art implementations from the literature, the prototype exokernel system is at least five times faster on operations such as exception dispatching and interprocess communication.
1,309 citations
Patent•
03 Jan 1997TL;DR: In this paper, the status of the vehicle and its devices (50a-50n) can be controlled and monitored by the remote stations (10a-10n) connected to another network.
Abstract: An on-vehicle communication network (40) establishes communication between vehicle devices (50a-50n) and a controller (30). The controller (30) also communicates, via an airlink (16), with remote stations (10a-10n) connected to another network (14). The status of the vehicle and its devices (50a-50n) can thereby be controlled and monitored by the remote stations (10a-10n).
881 citations