42 results about "Arrival process" patented technology

A method for conducting a repairable inventory analysis calculates the minimum number of repairable parts to be held in inventory while still being able to satisfy the demand for spare parts even in view of uncertain repair lead times. The method uses a set of equations that relates a customer service level to arbitrary probability distribution functions of a repair lead-time and a part arrival process. The distributions are then searched to locate the optimal inventory level in the distribution.

The present invention broadly contemplates addressing QoS concerns in overlay design to account for the last mile problem. In accordance with the present invention, a simple queuing network model for bandwidth usage in the last-mile bottlenecks is used to capture the effects of the asymmetry, the contention for bandwidth on the outgoing link, and to provide characterization of network throughput and latency. Using this characterization computationally inexpensive heuristics are preferably used for organizing end-systems into a multicast overlay which meets specified latency and packet loss bounds, given a specific packet arrival process.

A method for improving network performance using a virtual queue is disclosed. The method includes measuring characteristics of a packet arrival process at a network element, establishing a virtual queue for packets arriving at the network element, and modeling the packet arrival process based on the measured characteristics and a computed performance of the virtual queue.

The invention discloses a closed origin and arrival construction method of a shield machine, comprising the following steps: (1) using a tight continuous wall enclosure structure as a plain concrete continuous wall; (2) opening slanting periphery observation holes on a cavity door to observe the stable and leak conditions of soil bodies; (3) chiseling concrete and steel bars on the cavity door sectionally, and using plain concrete to replace the original continuous wall synchronously; (4) installing a receiving device of the shield machine, and applying pre-applied force; (5) filling materials in a steel sleeve barrel of the receiving device to a request height; (6) testing the pressure resistance of the steel sleeve barrel; (7) carrying out the digging construction of the shield machine until a shield tail of the shield machine enters or separates the cavity door; and (8) decompressing and disassembling the steel sleeve barrel of the receiving device. The closed origin and arrival construction method of the shield machine is safe, economical, efficient and simple, changes uncontrollable factors into controllable factors in a shield origin and arrival process, greatly reduces risks in a construction process, better controls land subsidence and provides the effectively ensured closed origin and arrival construction method of the shield machine.

The invention provides an iterative feedback-based X-ray accurate modulation apparatus and a control method therefor. The apparatus comprises a measurement module which is used for measuring high-speed current density close to the positive electrode of an X light pipe, and X photon stream density output by the X light pipe in real time, a regulation and control module which is used for performing comparison on the received high-speed current density and X photon stream density with an external input signal to obtain a regulation and control signal, and a feedback loop which is used for transmitting the regulation and control signal to the X light pipe so as to allow the X light pipe to perform corresponding feedback control according to the regulation and control signal. According to the iterative feedback-based X-ray accurate modulation apparatus and the control method therefor, high-accuracy simulation of the X ray pulsar photon arrival process can be realized through short and long term iterative feedback, so that higher simulation accuracy of a photon arrival time event can be realized.

A dynamic emergency evacuation method for failure of urban rail transit lines relates to the technical field of rail transit control. Solve the problem that the evacuation capacity of a single station is limited, resulting in the secondary spread of the stranded passenger flow in the network. Establish each station attribute set and station operation state set in the network; analyze the station passenger flow state; use SAS software to predict the subway passenger flow in a short time, and simulate the passenger flow arrival process; determine the evacuation starting point and evacuation end point; construct emergency state rail bus coordinated evacuation network; build a path dynamic selection model within the range of the starting and ending points; determine the best evacuation path; determine the required number of emergency buses and the running time interval; determine the distribution law of the passenger flow to be evacuated to the evacuation subway station; The train transportation capacity, combined with the passenger flow of the subway station, allocates resources for the train transportation capacity, and formulates the train operation plan in the emergency state. Increase the passenger flow evacuation capability of a single node and improve the network evacuation efficiency.

The present invention relates to the field of communication technology, in particular to a double-threshold-based multi-user cooperative spectrum sensing method. The method for multi-user cooperative spectrum sensing based on double thresholds includes the steps of: the secondary user constructs a statistical judgment according to the received data samples and the parameters of the random arrival process of the primary user signal; Construct corresponding double thresholds; judge statistical judgment amount and low threshold size, and send different judgment results to the fusion center. The fusion center fuses the first judgment result, the second judgment result and the third judgment result by OR principle to obtain a final judgment result. The double-threshold method can not only solve the problem of random arrival and identification of primary user signals, but also saves data volume compared with soft-decision cooperation, and the result is more accurate than hard-decision cooperation, which greatly improves performance while ensuring accuracy.

The invention relates to a method for analyzing reliability of component software considering a failure recovery process based on an HISQM (Hybrid Infinite Server Queue Module), which relates to a method for analyzing the reliability of software and overcomes the defect that in a traditional module and method based on an architecture, only a failure detection process is considered, while the failure recovery process is ignored. Based on a queuing theory, the HISQM is used for modeling the failure recovery process in a component software integration test. The component software integration test process comprises the failure detection process and the failure recovery process. A debugging strategy of the integration test combines the two random processes. The HISQM is formed by a plurality of independent ISQ (Infinite Server Queue) systems, and each ISQ system is used for describing a recovery behavior of component failure distributed to the system according to the debugging strategy. An arrival process and a leaving process of the HISQM are analyzed to be respectively corresponding to the failure detection process and the failure recovery process in the component software integration test. An NHPP (Non-Homogeneous Poisson Process) software reliability growth module is used for modeling the failure detection process of the component software.

Embodiments of the present invention provide a method and device for establishing a system model. In one embodiment, the method for establishing a system model includes: dividing at least one service node included in the service system into an arrival process, a service process, and a departure process, and the arrival process is used to indicate that the service object arrives from the outside The process of the service system, the service process represents the process of the service object receiving service in the service system, and the leaving process represents the process of the service object leaving the service system; The arrival queuing model of the arrival process, the service queuing model of the service process, and the departure queuing model of the departure process; the system model of the service system is established according to the arrival queuing model, service queuing model and departure queuing model.