Abstract: Methods and apparatus for split memory allocations in non-kernel space. Many modern networking technologies use asymmetric transmit and/or receive resource. Various aspects described herein split memory resources for transmit and receive, configuring each for their respective hardware optimizations. For example, a receive data paths that support batch processing and packet aggregation may be allocated large memory objects (32 KB) that can route data packets on a per-flow basis. In contrast, transmit data paths that support multiple concurrent network connections may be allocated small memory objects (2 KB) that can route data packets one at a time.

Abstract: The present technology displays an access list, seen state information, and presence information for content items stored and managed by a content management system. Advantageously, the present technology does not require users to view or work on content items within the content management system—they can work on content items natively on their own computing device.

Abstract: The present technology displays an access list, seen state information, and presence information for content items stored and managed by a content management system. Advantageously, the present technology does not require users to view or work on content items within the content management system—they can work on content items natively on their own computing device.

Abstract: The present technology displays an access list, seen state information, and presence information for content items stored and managed by a content management system. Advantageously, the present technology does not require users to view or work on content items within the content management system—they can work on content items natively on their own computing device.

Abstract: An integrated assembly is provided with both an adjustable lumbar support and a head tilt. The assembly is easily installed on any of a number of different seating units, and can be adjusted to accommodate seating units with a variety of back widths, and heights.

Abstract: An integrated assembly is provided with both an adjustable lumbar support and a head tilt. The assembly is easily installed on any of a number of different seating units, and can be adjusted to accommodate seating units with a variety of back widths, and heights.

Abstract: The present technology displays an access list, seen state information, and presence information for content items stored and managed by a content management system. Advantageously, the present technology does not require users to view or work on content items within the content management system—they can work on content items natively on their own computing device.

Abstract: A system for local metal distortion correction for using an accurate electromagnetic tracking system in a medical environment comprises an electromagnetic field generator monitoring a medical device having a suitable sensor coil. A correction function, derived from an error correction tool, is applied to the position and orientation readings of the sensor coil. The error correction tool comprises a number of electromagnetic sensors arranged in a fixed and known geometric configuration and is placed surrounding the site of the medical procedure. Sensor data is displayed on an imaging system. In addition, a distortion mapping can be done utilizing optical sensors for relative positioning readings along with an electromagnetic tracking system sensor.

Abstract: A method and system for dynamic metal distortion compensation using an Electromagnetic Tracking System (EMTS) (10) using an electromagnetic field from an electromagnetic field generator (12). A plurality of fiducial markers (14) are provided, each having at least one electromagnetic sensor (26), the electromagnetic sensors oriented in a plurality of sensor orientations, and at least some of the sensors being located proximal to a volume of interest. The fiducial markers (14) are imaged to provide their position in image space. Position readings of the electromagnetic sensors (26) are monitored using the EMTS. A metal distortion correction function is calculated by comparing the positions of the fiducial markers in image space to the positions of the electromagnetic sensors. A medical device (16) moving through the volume of interest is also tracked using the EMTS, and the distortion correction function is applied to medical device position readings to compensate for the distortion.

Abstract: A tracking system (300) for a target anatomy of a patient (305) can include a first marker (10) having a size and shape for insertion into the patient to reach the target anatomy where the first marker has a first electromagnetic (EM) sensor (50) and an imageable region (90), a plurality of second markers (310) having a size and shape for adhesion to the patient in proximity to the target anatomy where the second markers each have a second EM sensor and are imageable, a field generator (340) adapted for applying a magnetic field to the target anatomy and inducing a current in the first and second sensors, and a processor (11, 320) having a controller adapted to determine positions of the first and second markers based on the induced currents.

Abstract: A system for local metal distortion correction for using an accurate electromagnetic tracking system in a medical environment is disclosed containing an electromagnetic field generator monitoring a medical device having a suitable sensor coil wherein a correction function, derived from an error correction tool, is applied to the position and orientation readings of the sensor coil. The error correction tool consists of a number of electromagnetic sensors arranged in a fixed and known geometric configuration and is placed surrounding the site of the medical procedure. Sensor data is displayed on an imaging system. In addition, a distortion mapping can be done utilizing optical sensors for relative positioning readings along with an electromagnetic tracking system sensor.

Abstract: A method of color mixing with arc stability and arc straightening of HID lamps operated at high frequencies which modulates a duty cycle of a half bridge configured resonant inverter at a frequency which is substantially one-half the frequency of a second longitudinal acoustic mode of the HID lamp. The method also sweeps the switching frequency in a high frequency range of such resonant inverter. The duty cycle modulation effectuates power modulation to create a fixed frequency power component which is substantially equal to the frequency of the second longitudinal acoustic mode. The sweeping switching frequency of the half bridge configured resonant inverter drives the HID lamp in a manner which effectuates arc stability and arc straightening.

Abstract: A method of color mixing with arc stability and arc straightening of HID lamps operated at high frequencies which modulates a duty cycle of a half bridge configured resonant inverter at a frequency which is substantially one-half the frequency of a frequency of a second longitudinal acoustic mode of the HID lamp. The method also sweeps the switching frequency in a high frequency range of such resonant inverter. The duty cycle modulation effectuates power modulation to create a fixed frequency power component which is substantially equal to the frequency of the second longitudinal acoustic mode. The sweeping switching frequency of the half bridge configured resonant inverter drives the HID lamp in a manner which effectuates arc stability and arc straightening.

Abstract: An electronic ballast with lamp run-up current regulation. In one aspect, the electronic ballast comprises an input stage coupled to an AC source, the input stage converting an AC voltage to a direct current bus voltage, an output stage having inputs coupled to the bus voltage and outputs connected to a lamp, the output stage providing (i) power to the lamp so as to produce a lamp voltage and lamp current in a steady state mode of operation, and (ii) a lamp run-up current to the lamp during a run-up phase of the operation of the lamp, and a current regulation circuit for regulating the lamp run-up current so that the lamp run-up current exceeds a steady state lamp current value, and increases if either the bus voltage increases or the lamp voltage decreases. The output circuit comprises a main high-frequency switching inductor through which an inductor current flows wherein the lamp current is based upon the inductor current.

Abstract: A method and apparatus for driving a ballast in critical discontinuous mode (CDCM). The method provides for zero loss switching in order to maximize efficiency, and also provides controllable input and output power without the use of complex and costly feedback loops.

Abstract: An electronic ballast with lamp run-up current regulation. In one aspect, the electronic ballast comprises an input stage coupled to an AC source, the input stage converting an AC voltage to a direct current bus voltage, an output stage having inputs coupled to the bus voltage and outputs connected to a lamp, the output stage providing (i) power to the lamp so as to produce a lamp voltage and lamp current in a steady state mode of operation, and (ii) a lamp run-up current to the lamp during a run-up phase of the operation of the lamp, and a current regulation circuit for regulating the lamp run-up current so that the lamp run-up current exceeds a steady state lamp current value, and increases if either the bus voltage increases or the lamp voltage decreases. The output circuit comprises a main high-frequency switching inductor through which an inductor current flows wherein the lamp current is based upon the inductor current.

Abstract: An improved ignition circuit for a high intensity discharge (HID) lamp is disclosed. The ignition voltage is provided across a single capacitor, and at the end of the ignition phase, a second capacitor is switched into the circuit to divide the voltage across two capacitors, and provide a steady state square wave current and voltage.

Abstract: A method of color mixing a very high frequency operated HID lamp which effectuates power modulation to the HID lamp at a frequency of the second longitudinal acoustic mode by modulating the duty cycle of a half bridge configured resonant inverter. The duty cycle is modulated with a modulation frequency which is substantially one-half the frequency of the second longitudinal acoustic mode of the HID lamp. In operation, exciting the second longitudinal acoustic mode of the HID lamp with the half bridge configured resonant inverter operated with a modulated duty cycle achieves color mixing along a vertical axis of the HID lamp.

Abstract: A method and apparatus for driving a ballast in critical discontinuous mode (CDCM) is disclosed. The method provides for zero loss switching in order to maximize efficiency, and also provides controllable input and output power without the use of complex and costly feedback loops.