1. A method for determining a window size for a connection between a sender and a receiver, comprising:
determining a peak information rate for the connection;
determining an available bandwidth for the connection;
determining a round trip time for the connection;
computing a first product of the peak information rate and the round trip time;
computing a second product of the available bandwidth and the round trip time; and
determining the window size as a minimum of the first product and the second product;
wherein the window size is determined by a network node adapted for policing the connection between the sender and the receiver.
2. The method of claim 1, further comprising:
communicating the window size to at least one endpoint of the connection, the at least one endpoint comprising at least one of a sender of the connection and a receiver of the connection.
3. The method of claim 2, further comprising:
receiving an acknowledgment message from the at least one endpoint of the connection; and
adjusting a token bucket size of a token bucket associated with the connection in response to the acknowledgment message.
4. The method of claim 1, wherein the round trip time is determined by a policing function associated with the connection, wherein the round trip time is determined using a token bucket.
5. A method for controlling a window size for a connection between a sender and a receiver, comprising:
determining, at a network node adapted for policing the connection using a token bucket, a window size for the connection, wherein determining the window size comprises:
determining a peak information rate for the connection;
determining an available bandwidth for the connection;
determining a round trip time for the connection; and
determining the window size using the peak information rate, the available bandwidth and the round trip time;
propagating the window size toward at least one endpoint of the connection, wherein the at least one endpoint of the connection comprises at least one of the sender of the connection and the receiver of the connection;
receiving an acknowledgment message from the at least one endpoint of the connection, wherein the acknowledgment message acknowledges receipt of the window size; and
adjusting a token bucket size of the token bucket associated with the connection in response to the acknowledgment message.
6. The method of claim 5, wherein determining the window size comprises:
computing a first product as a product of the peak information rate of the connection and the round trip time of the connection;
computing a second product as a product of an available bandwidth for the connection and the round trip time of the connection; and
selecting the window size as a minimum of the first product and the second product.
7. A method for controlling a window size for a connection between a sender and a receiver, comprising:
monitoring a token bucket associated with the connection for a condition, wherein the token bucket is monitored at a network node adapted for policing the connection, wherein the condition comprises at least one of a number of dropped packets for the connection being above a first threshold or a bandwidth utilization for the connection being below a second threshold; and
in response to detecting a condition associated with the token bucket, propagating information toward the sender of the connection, wherein the information is adapted for enabling the sender of the connection to adjust the window size for the connection.
8. The method of claim 7, wherein the information propagated toward the sender of the connection comprises information adapted for use by the sender of the connection to determine the window size for the connection.
9. The method of claim 8, further comprising:
receiving the information at the sender of the connection;
determining the window size for the connection using the received information; and
adjusting the window size for the connection from a current window size to the determined window size.
10. The method of claim 7, wherein the information propagated toward the sender of the connection is the window size for the connection.
11. The method of claim 10, wherein the window size for the connection is determined using at least one window parameter, wherein the at least one window parameter comprises at least one of a current window size of the connection, a peak information rate of the connection, and a round trip time of the connection.
12. A method for determining a window size for a connection, comprising:
receiving a current window size associated with the connection, wherein the current window size is received by a network node comprising a token bucket associated with the connection, wherein the current window size is received from a sender of the connection;
in response to receiving the current window size, monitoring the token bucket associated with the connection; and
in response to detecting a condition associated with the token bucket, determining an updated window size for the connection using the current window size associated with the connection.
13. The method of claim 12, where the condition comprises at least one of a number of dropped packets for the connection being above a first threshold or a rate utilization for the connection being below a second threshold.
14. The method of claim 12, wherein determining the window size for the connection using the current window size associated with the connection comprises:
decreasing the current window size if monitoring of the token bucket for the connection indicates that packets are being dropped; and
increasing the current window size if monitoring of the token bucket for the connection indicates that at least a portion of the available bandwidth of the connection is unutilized.
15. The method of claim 14, wherein the at least one window parameter comprises at least one of a current window size of the connection, a peak information rate of the connection, and a round trip time of the connection.
16. The method of claim 12, further comprising:
transmitting the updated window size to a sender of the connection;
receiving the updated window size at the sender of the connection; and
adjusting, at the sender of the connection, from using the current window size for the connection to using the updated window size for the connection.
17. A method for determining a plurality of connection window sizes for each of a respective plurality of connections, comprising:
determining a peak information rate for the plurality of connections;
determining a round trip time for the plurality of connections;
determining a total window size using the peak information rate and the round trip time; and
determining the plurality of connection window sizes by distributing the total window size across the plurality of connections;
wherein the connection window sizes are determined by a network node configured for policing the connections using a single token bucket.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1.-12. (canceled)
13. A system for performing radioactive substance detection and X-ray radiation detection on an object under examination, which comprises:
an X-ray detection device for performing X-ray radiation imaging examination on the object under examination;
a radioactive substance monitoring device placed adjacent to the X-ray detection device to detect the radioactive rays emitted by the object under examination;
characterized in that the radioactive substance monitoring device sets, within the detection energy region thereof, a lower limit of detection to distinguish the energy region of the detected X-rays emitted by the X-ray detection device from the energy region of the radioactive rays emitted by the object under examination, and detects the counting or spectrum of rays in the energy region higher than said lower limit of detection.
14. The system of claim 13, wherein the radioactive substance monitoring device detects the counting of rays in the energy region higher than the lower limit of detection using a single-track counter.
15. The system of claim 13, wherein the radioactive substance monitoring device detects the spectrum of rays in the energy region higher than the lower limit of detection using a multitrack pulse amplitude analyzer.
16. The system of claim 15, wherein the radioactive substance monitoring device filters the distortion effect of the spectrum caused by the X-rays emitted from the X-ray detection device through a digital filtering processing.
17. The system of claim 16, wherein the digital filtering processing includes converting the spectrum using a high pass low cut filter.
18. The system of claim 13, wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
19. The system of claim 14, wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
20. The system of claim 15, wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
21. The system of claim 16, wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
22. The system of claim 17, wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
23. A method for performing radioactive substance detection and X-ray radiation detection on an object under examination, which comprises:
performing X-ray radiation detection on the object under examination with an X-ray detection device;
detecting the radioactive rays emitted by the object under examination with a radioactive substance monitoring device;
placing the X-ray detection device adjacent to the radioactive substance monitoring device;
characterized in setting, within the detection energy region of the radioactive substance monitoring device, a lower limit of detection for distinguishing the energy region of the detected X-rays emitted by the X-ray detection device from the energy region of the radioactive rays emitted by the object under examination, and detecting the counting or spectrum of rays in the energy region higher than said lower limit of detection.
24. The method of claim 23, wherein the radioactive substance monitoring device detects the counting in the energy region higher than the lower limit of detection using a single-track counter.
25. The method of claim 23, wherein the radioactive substance monitoring device detects the spectrum in the energy region higher than the lower limit of detection using a multitrack pulse amplitude analyzer.
26. The method of claim 25, wherein the distortion effect of the spectrum caused by the X-rays emitted from the X-ray detection device is filtered by digital filtering processing.
27. The method of claim 26, wherein the digital filtering processing includes converting the spectrum using a high pass low cut filter.
28. The system of claim 23, wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
29. The system of claim 24, wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
30. The system of claim 25 wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
31. The system of claim 26 wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.
32. The system of claim 27 wherein the lower limit of detection is set dynamically by a digital circuit according to the restriction of energy range and the requirement of sensitivity.