630 results about "Network simulation" patented technology

A network troubleshooting framework is described. In an implementation, a method includes generating a first estimation of network performance by a simulator based on network settings obtained from a network, estimating the new performance under an alternative setting by providing the alternative setting to the network simulation and observing the simulation output, repeating the procedure for other alternative settings, and suggesting the alternative setting that improves network performance.

A network simulation apparatus and method for analyzing abnormal network traffic are provided. The network simulation apparatus includes: a traffic information collection unit, which collects traffic information in real time from a network; a simulator, which performs a simulation operation in a virtual network topology environment according to a predetermined scenario, the virtual network topology environment generating virtual traffic including a normal virtual packet modeled based on a normal traffic environment and an abnormal virtual packet modeled based on an abnormal traffic environment with a network traffic attack launched thereupon based on the collected real-time traffic information; and an interface unit, which provides the simulation operation results to a user. Accordingly, it is possible to effectively detect, analyze, and deal with abnormal network traffic that has occurred in a network to be managed.

A high fidelity distributed plant simulation technique includes a plurality of separate simulation modules that may be stored and executed separately in different drops or computing devices. The simulation modules communicate directly with one another to perform accurate simulation of a plant, without requiring a centralized coordinator to coordinate the operation of the simulation system. In particular, numerous simulation modules are created, with each simulation module including a model of an associated plant element and these simulation modules are stored in different drops of a computer network to perform distributed simulation of a plant or a portion of a plant. At least some of the simulation modules, when executing, perform mass flow balances taking into account process variables associated with adjacent simulation modules to thereby assure pressure, temperature and flow balancing (i.e., conservation of mass flow) through the entire simulation system. In a dynamic situation, a transient mass storage relay technique is used to account for transient changes in mass flow through any non-storage devices being simulated by the simulation modules. Moreover, adjacent simulation modules located in different drops communicate directly with one another using a background processing task, which simplifies communications between adjacent simulation modules without the need for a central coordinator.

An apparatus and process for empowering those in wheelchairs and others with loss of limb control to walk, climb stairs, sit in ordinary chairs, use normal bathroom facilities and stand at normal height with their peers. It also provides a means to speed rehabilitation of the injured and a means to deliver more comfortable and effective prostheses while providing superior physical therapy without draining professional resources which includes new simulation and training means. Most of the apparatus is worn under normal clothing allowing them to enjoy a normal appearance. Additional advancements include improved actuator design, user interface, visual means and advanced responsive virtual reality.

A method for at least apparently reducing the effects of network lag is provided. For a networked interactive game system including at least one local game system and at least one remote game system, distributed game play of an interactive game with at least an apparent reduction of network lag at the local game system is allowed. An input command which was generated by a local user of the local game system that controls a local object is intercepted. Furthermore, at least state data of a remote object that was determined in a network simulation of a previous game frame is retrieved. Interaction data of the local object for a local simulation of an immediately previous game frame may also be retrieved. A local simulation of the first game frame is generated based on the input command, the state data, and the interaction data.

A method for operating a networked interactive game system is provided. An input command generated by a local user of a local game system that controls a local object of an interactive game may be received. A state for the local object in the present game frame may be predicted based on the input command. State data of a first object of the interactive game that was determined in a network simulation of a previous game frame may be retrieved. A global object of the interactive game in the present game frame may be course-corrected to be aligned with the global object in the previous game frame using the predicted state for the local object in the present game frame and the state data of the first object of the previous game frame. The present game frame may be rendered with the course-corrected global object.

A computer simulation enhanced exercise device is provided which engages the user by directly relating the users exercise motion in real time to a visual simulation or interactive game. The exercise device may comprise any variety of machines including, stationary bikes, rowing machines, treadmills, stepper, elliptical gliders or under desk exercise. These exercise devices are configured with sensors to measure physical movements as the user exercises and are coupled to computer hardware with modeling and virtualization software to create the system. These sensor measurements are then sent to a computer for use in the physics based modeling and real-time visual simulation. The computer simulation enhanced exercise device is further provided with features including manual and automatic adjustment of resistance levels, visualization of accurate caloric burn rates and correlation to everyday food items, and network connectivity providing for multiplayer network simulations and directed advertising.

Event-driven processor architectures are particularly suited for use in multiple sensor node networks and simulators of such networks. A first variation of the processor is particularly suited for use in a sensor node in a wireless sensor network. Through use of the event-driven architecture and special message and timing coprocessors, this embodiment of the invention is optimized for low energy requirements and data monitoring operations in sensor networks. A second embodiment of the invention includes modifications necessary for use of the processor in a network simulation protocol.

The invention relates to a human body measurement method, in particular to the non-contact human body measurement method for clothing design which belongs to the technical field of clothing design. The digital images of the front surface and the side surface of the human body are firstly obtained; the extraction of the image edges are carried out by adopting the color segmentation, the best threshold segmentation, the hole filling, the opening operation and the pixel communication image processing method, thereby obtaining the image edges of the front surface and the side surface of the human body; the human body measurement feature points and the lines are determined, the corresponding height and width measurement data of the human body for the clothing design are obtained by calculation; a mathematical model is established by applying the width and the thickness data of the human body to obtain the related circumference data, and the human body circumference measurement data for the clothing design is obtained by BP neural network simulation and regression prediction treatment. The method has simple device, convenient operation and low measurement cost, thereby being capable of meeting the requirements on the design and the production of the clothing industry and having broad popularization and application prospects.

The invention provides a high-accuracy time synchronizing apparatus, a method and a system for testing the computer network performance, monitoring system and network simulation, which comprises the following steps: utilizing a hardware circuit to realize a timestamp generating circuit, moving a timestamp recording position to a physical chain circuit layer, removing impact of the cache delay in the timestamp of a common software and impact caused by interrupting the response time delay, and realizing the accurate clock synchronization of each measuring node through the prediction-based time synchronous algorithm (Prediction-based Clock Synchronization,PCS). The apparatus improves the accuracy of the timestamp, can guarantee the error of the synchronous timestamp of each measured node notto exceed 100ns, and can reach the accuracy which is equal to adopting GPS synchronization, and the realization is simple and the cost is low.

The invention discloses a dispatching automation digital physical hybrid simulation training system. A primary device is a power network simulation system, and a secondary device comprises a control center main station and/or an intelligent substation. The control center main station comprises a control system server, and the control system server is respectively connected with the intelligent substation and a digital physical hybrid simulation system. The digital physical hybrid simulation system comprises an interface portion and a simulation power network portion, the interface portion is provided with a station signal simulation terminal and a digital physical interface device, the digital physical interface device is connected with the intelligent substation, the simulation power network portion is provided with the primary device, and the primary device is respectively connected with the station signal simulation terminal and the digital physical interface device. A real operating environment is provided for simulation training by seamlessly connecting the secondary real device, a real dispatching automation system and the primary simulation device through the digital physical interface device.

A hybrid test bed mixes simulated and actual wireless communication network entities in a real-time packet data simulation. In at least one embodiment, the test bed supports end-to-end simulation for a packet data application running on a mobile station simulator. The test bed provides a realistic assessment of that application's real-time performance by constraining packet data transmissions from a radio base station simulator to the mobile station simulator according to peak data throughput estimates and mobility event processing determined from a detailed wireless communication network simulation. Additionally, the test bed includes or is associated with a graphical display system providing real-time performance information.

The invention is applicable to the technical field of networks and provides a network simulation topology construction method and device applied to a network shooting range and a computer readable storage medium, and the method comprises the steps: detecting a user operation triggered in a graphical editing interface, generating a topology file according to the user operation, and enabling the topology file to be used for representing the network topology of the network shooting range; analyzing the topological file, and generating a configuration file according to an analysis result, the configuration file comprising a virtual machine configuration file and a network configuration file; starting a core service based on the configuration file, wherein the core service is used for calling acorresponding API to construct a network simulation topology; And based on the core service, deploying network simulation resources corresponding to the configuration file according to the type of the network simulation environment. According to the invention, the real network topology of key infrastructure and industrial control can be reproduced visually, quickly, vividly and completely.

Upon receipt of an end point list, a model setting unit requests the measurement/information collection unit to search a path. The model setting unit receives a path appliance list from the measurement/information collection unit, and generates the configuration of a simulation model of a network. The model setting unit selects an appropriate model for each component of the configuration of the simulation model. Then, the model setting unit sets the parameter value of the model based on the measurement result and the collected information received from the measurement/information collection unit, and automatically generates the simulation model of the network.

A general purpose program implemented on a computer analyzes steady state and transient flow in a complex fluid network, modeling phase changes, compressibility, mixture thermodynamics and external body forces such as gravity and centrifugal force. A preprocessor provides for the interactive development of a fluid network simulation having nodes and branches. Mass, energy, and specie conservation equations are solved at the nodes, and momentum conservation equations are solved in the branches. Contained herein are subroutines for computing "real fluid" thermodynamic and thermophysical properties for 12 fluids, and a number of different source options are provided for modeling momentum sources or sinks in the branches. The system of equations describing the fluid network is solved by a hybrid numerical method that is a combination of the Newton-Raphson and successive substitution methods. Application and verification of this invention are provided through an example problem, which demonstrates that the predictions of the present invention compare most reasonably with test data.

This invention relates to a network emulation test system and a method. The system includes a system configuration management module, a network data process module and a network interface module, among which, said system configuration management module is communicated with the network data process module, which includes various emulation test function units, receives the test instructions and test parameters sent by the management module to finish related test tasks and returns the test results back to the management module, in which, the functional test unit realizes the data flow emulation, application emulation and easy test meeting the RFC standard at high performance, high accuracy and multiple kinds

A method and apparatus for analyzing steady state and transient flow in a complex fluid network, modeling phase changes, compressibility, mixture thermodynamics, external body forces such as gravity and centrifugal force and conjugate heat transfer. In some embodiments, a graphical user interface provides for the interactive development of a fluid network simulation having nodes and branches. In some embodiments, mass, energy, and specific conservation equations are solved at the nodes, and momentum conservation equations are solved in the branches. In some embodiments, contained herein are data objects for computing thermodynamic and thermophysical properties for fluids. In some embodiments, the systems of equations describing the fluid network are solved by a hybrid numerical method that is a combination of the Newton-Raphson and successive substitution methods.

The invention provides an OpenStack based software defined network simulation system. The system comprises a virtual machine creating module, a simulation network setting module and a test module, wherein the virtual machine creating module creates multiple virtual machines according to requirements, the simulation network setting module arranges at least one software defined network controller and at least one software defined network switch in the created virtual machines according to requirements so as to establish a corresponding network topology network, and the test module tests whether the arranged software defined network controller and software defined network switch satisfy requirements according to the established network topology structure. The system uses the test module to test whether the arranged software defined network controller and software defined network switch satisfy requirements, so that the needed controller and switch can be developed according to requirements, the setting flexibility of the software defined network is improved, and the design cost is reduced. The invention also provides a software defined network simulation method.

The invention discloses a hardware based network simulation system. The system comprises a network simulation unit and multiple simulation nodes, wherein the network simulation unit adjusts the topological graph of the simulation nodes in a simulation network according to users, and configures characteristic parameters of a simulation link connected to the simulation nodes; and based on the adjusted network topological graph and the configured link characteristic parameters, the simulation nodes implements simulated experiments on the network protocols or server program via the simulation link. The invention further discloses a simulation method based on the network simulation system. Compared with a traditional network experiment platform, a network simulator computer (or embedded equipment) is connected with multiple simulation node computers, a simulation control system of the network simulator computer is operated to realize network topology change and configuration of the characteristic parameters of the simulation link, and the network protocol can be verified under different network topologies and link characteristic parameters via fewer common computers.

Real and simulated (virtual) networks are interfaced with one another for carrying out hardware-in-the-loop (HITL) testing and evaluations. A simulated network is modeled at a workstation by running a network simulation or discrete event modeling tool on the workstation. A virtual gateway node is defined in the simulated network, and the gateway node is linked with a network adapter on the workstation. An external real network operating with Internet protocol (IP) is also linked with the adapter. The adapter and the gateway node are configured to (i) translate simulated data packets sent from nodes of the simulated network and designated for the real network, into IP data packets for routing or processing by the real network, and (ii) translate IP data packets sent from nodes of the real network and designated for the simulated network, into simulated data packets for routing or processing by the simulated network.

The invention provides an auto-management data link of micro unmanned aerial vehicles, which comprises a physical medium which is 2.4 to 2.483GHz microwaves, a link protocol which is ZigBee protocol is an international standard IEEE802.15.4-based wireless network protocol, and equipment formed by connecting a micro unmanned aerial vehicle model with a wireless module and an antenna, which are fixedly arranged in the unmanned aerial vehicle model, through a serial port RS-232. The wireless module consists of a ZigBee coordinator and a ZigBee router and adopts a half duplex communication mode; a data link network topology is a tree topology; and data link simulation software is the 14.5 edition of OPNET network simulation software. The data link allows the transmission speed of the unmanned aerial vehicles to reach 250kbps; the channel utilization rate can reach 90 percent; the packet transfer delay is 0.4s; and the throughput of the data link is 63kbps.