The present invention is generally directed to a system for monitoring a variety of environmental and/or other conditions within a defined remotely located region. In one aspect, a system is configured to monitor utility meters (613) in a defined area. The system is implemented by using a plurality of wireless transmitters (614), each integrated into a sensor (612) adapted to monitor a particular data input. The system also includes a plurality of transceivers (221) that are dispersed throughout the region at defined locations. The system uses a local gateway (210) to translate and transfer information from the transmitters to a dedicated computer (260) on a network (230). The dedicated computer collects, compiles and stores the data for retrieval upon client demand across the network. The computer further includes means for evaluating the received information and identifying an appropriate control signal to be applied at a designated actuator.

System and method for monitoring and controlling remote devices

Wireless communication networks for monitoring and controlling a plurality of remote devices are provided. Briefly, one embodiment of a wireless communication network may comprise a plurality of wireless transceivers having unique identifiers. Each of the plurality of wireless transceivers may be configured to receive a sensor data signal from one of the plurality of remote devices and transmit an orginal data message using a predefined wireless communication protocol. The original data message may comprise the corresponding unique identifier and sensor data signal. Each of the plurality of wireless transceivers may be configured to receive the original data message transmitted by one of the other wireless transceivers and transmit a repeated data message using the predefined communication protocol. The repeated data message may include the sensor data signal and the corresponding unique identifier. Furthermore, at least one of the plurality of wireless transceivers may be further configured to provide the original data messages and the repeated data messages to a site controller connected to a wide area network. The site controller may be configured to manage communications between the wireless communication network and a host computer connected to the wide area network.

Wireless communication networks for providing remote monitoring of devices

A wireless network, which includes a wireless router client operable to broadcast data packets to at least one wireless server and one additional wireless client. Each client and server includes programs for determining optimum routes between them. The client also includes a program for determining if a received data packet is not addressed to it and if the packet has been sent via a new optimal route unknown to the client, and for notifying the respective server of such a new optimal route.

Wireless network system and method for providing same

A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to intermediate base stations, then sent by the base stations to the central computer by a serial link. Direct sequence spread spectrum modulation is used for the RF link. The remote hand-held units initiate an exchange using RF transmission to and from the base stations, receiving only during a rigid time window following a transmission from the remote unit. The base stations cannot initiate communication to the remote units, but instead send data to the remote units only as part of the exchange.

Packet data communication network

An automated meter reading server (15) having an open, distributed architecture that collects, loads, and manages system-wide data collected from energy meters (60) and routes the data automatically to upstream business systems. The automated meter reading server includes a repository (120) of metering data, and additionally provides timely access to information by including collection, storage, validation, estimation, editing, publishing and securing of meter consumption and interval data. The automated meter reading server obtains data from meters (60) equipped with modems via standard telephone lines or public RF networks. The data is converted from the format of the meter/communications infrastructure to a format usable by the automated meter reading server and the repository (120). The data is converted from the automated meter reading server compatible form to a format of a specific upstream business system prior to transmission.

Automated meter reading system

A wide area communications network communicating data from a plurality of network service modules through a plurality of remote cell nodes and intermediate data terminals to a central data terminal. The wide area communications network collects network data generated by a plurality of physical devices such as gas, water or electricity meters, located within a geographical area. The wide area communications network is a layered network having a hierarchical communications topology. The central data terminal controls network operation. Intelligence exists at all layers of the network, thereby easing the workload of the central data terminal. The intelligence attributed to each module is a function of the application of that module.

Radio communication network for remote data generating stations

In order to provide DSL service to more subscribers, at least part of the DSLAM is provided at a location, e.g. an outside plant interface unit (16), that is intermediate the subscriber premises (101,... 10N) and the central office (13) housing the remainder of the DSLAM. An optical fiber conveys signals between the two parts of the DSLAM, thus reducing the length of the twisted-wire portion of the subscriber loop. To reduce complexity and equipment costs, access apparatus for connecting a plurality of DSL lines to a data network (28) comprises a plurality of interface units connected to a plurality of DSL lines, respectively, for converting high frequency analog signals to digital signals, or vice versa; at least one digital signal processor (DSP) modem (30) for processing the digital signals and routing the processed signals to the data network, and for processing signals from the data network and supplying the resulting digital signals to the interface units, respectively. A session switch (92) may be provided for making virtual connections between respective ones of the interface units whose associated DSL lines are active and the DSP modems. The session switch maintains each connection for the duration of a session. With such an arrangement, a pool of DSPs may be shared by a much larger number of DSL lines.

Apparatus for connecting digital subscriber lines to central office equipment

A patient imaging system includes a patient support table, an MRI system including a cylindrical magnet and a PET system including positron detectors mounted in a ring. The magnet defines a cylindrical bore for receiving the patient on the table where the magnet is mounted for rotation about a vertical axis on a slew ring carried on rails allowing longitudinal movement. The PET ring is mounted in the bore for longitudinal movement. The quench tube for the magnet passes through the slew ring with a rotary union at the axis. The shielding covers include a fixed upper part and a lower part which rotates about the axis with the magnet. The magnet is arranged in a two or three room diagnostic configuration in which a holding bay houses the magnet and the diagnostic patients are organized in the three rooms each cooperating with the magnet bay as the magnet is rotated.

Movable integrated scanner for surgical imaging applications

The optical, electronic, and structural properties of a-Si:H films deposited by ECR microwave plasmas at 10−3 torr have been studied as functions of substrate bias. Films deposited on quartz and stainless steel substrates with their surfaces normal to the fringing magnetic field display good optical and electronic properties. For moderate negative bias the films deposited on stainless steel consistently displayed higher density and better optical and electronic properties compared to films deposited on quartz. These properties are explained based on ion energy bombardment of the growing films and correlated with Langmuir probe plasma studies. Ion bombardment of the growing film is seen to play an important role in film quality.

Effects of substrate bias on structure and properties of a-Si:H films deposited by ECR microwave plasmas

Spectroscopic ellipsometry and x‐ray diffraction measurements have been used to obtain structural information on hydrogenated amorphous and microcrystalline silicon thin films. The films were deposited onto quartz substrates from a microwave plasma in SiH4/H2 gas mixture. For ellipsometric data analysis, the films were modeled as multilayer structures with the dielectric response of each layer calculated as a function of the amorphous, crystallite, and void volume fractions through an effective‐medium approximation. Results indicate that the transition from amorphous‐to‐microcrystalline films is accompanied by a reduction in the material density and a significant increase in the surface roughness overlayer. X‐ray diffraction measurements estimate a higher volume fraction of crystallites as compared to that obtained from optical data.

Investigation of the amorphous‐to‐microcrystalline transition of hydrogenated silicon films by spectroscopic ellipsometry

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