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155 results about "Direct feedback" patented technology

TCP (Transmission Control Protocol) congestion control method based on congestion queue length

The invention discloses a TCP (Transmission Control Protocol) congestion control method based on a congestion queue length for use in a data center SDN (Software Defined Networking) environment. The method comprises the following steps that: a queue management module monitors a queue length of a switch port; when the queue length exceeds a certain threshold, a current network is considered to be in a congestion state, and congestion announcement information is transmitted to a controller through an SDN/OpenFlow protocol; after the controller receives the information, a flow table is issued to a switch, and an ACK (Acknowledgement) message reversely flowing through the port is modified in order that the ACK message carries queue length information of a network congestion point; and after a transmitting end receives the ACK message, the transmission rate of the transmitting end is lowered according to the queue length information in the ACK message in order to relieve network congestion. According to the method, a congestion degree is represented by direct feedback at the network congestion point, so that the problem of data center network congestion can be solved effectively, and the network throughput is increased. Meanwhile, an SDN/OpenFlow technology is utilized in the method, so that the method is more flexible and efficient.
Owner:NANJING UNIV OF SCI & TECH

Versatile gate-array cell with interstitial transistors for compact flip-flops with set or clear

A gate-array cell uses smaller and larger transistors. Four larger transistors are provided: two n-channel and two p-channel. A small p-channel transistor is placed between the contact tabs of the polysilicon lines of the two larger p-channel transistors, and between the p-channel transistors and a N-well tap. A small n-channel transistor is similarly placed between the contact tabs of polysilicon lines of the two larger n-channel transistors, and between the n-channel transistors and a P-well tap. The cell is slightly expanded in height to accommodate the two smaller transistors. The smaller transistors enable a reduction in the number of transistors required for latches and flip-flops. The smaller transistors allow a feedback inverter to directly connect to an input, since the input can easily over-power the feedback current. This is not possible for standard gate array cells having only one transistor size. Transmission gates are eliminated when direct feedback is feasible. Thus, the smaller transistors enable a reduction in transistor count as well as being smaller in size. Clear and set are provided by larger pull-down or pull-up transistors rather than NAND gates, since the larger pull-down and pull-up transistors can easily over-power the feedback inverters.
Owner:DIODES INC

Direct valve closed-loop fin stabilizer

The invention provides a direct valve closed-loop fin stabilizer. A gyro of the direct valve closed-loop fin stabilizer detects angular velocity signals of ship swaying, the angular velocity signals control command motors of digital hydraulic valves to rotate for a certain angle according to the number of pulses, and valve ports of the digital hydraulic valves are opened to supply oil to two hydraulic cylinders driving a fin in a differential motion mode to drive a fin blade to rotate. A rotary encoder on a fin shaft performs direct feedback to feedback motors of the digital hydraulic valves to drive valve elements to move to the closing direction until the number of pulses fed back by a sensor is the same as the number of pulses controlled by a controller, the valve ports of the hydraulic valves are closed, the hydraulic cylinders stop moving, the fin blade stops rotating, and direct control over the fin blade of the signals of the gyro is achieved, namely turning angles of the fin stabilizer is directly controlled by wind and wave signals. The direct valve closed-loop fin stabilizer has the outstanding advantages that fin angle feedback signals of the fin stabilizer directly act on the digital hydraulic valves, no operation performed by the controller is needed, steps are reduced, system reliability and stability are improved, and an important improvement on a fin stabilizer control method is achieved.
Owner:WUHAN HAILIWEI ELECTROMECHANICAL TECH
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