671 results about "Modeling and simulation" patented technology

A computer implemented method for statistical modeling and simulation of the impact of global variation and local mismatch on the performance of integrated circuits, comprises the steps of: estimating a representation of component mismatch from device performance measurements in a form suitable for circuit simulation; reducing the complexity of statistical simulation by performing a first level principal component or principal factor decomposition of global variation, including screening; further reducing the complexity of statistical simulation by performing a second level principal component decomposition including screening for each factor retained in the first level principal component decomposition step to represent local mismatch; and performing statistical simulation with the joint representation of global variation and local mismatch obtained in the second level principal component decomposition step.

A Modeling, Design, Analysis, Simulation, and Evaluation (MDASE) aspects of gyrocompassing in relation to Far-Target Location (FTL) systems include a Gyrocompass Modeling and Simulation System (GMSS). The GMSS is a modularized software system which has four major components: the 6DOF Motion Simulator, the IMU Sensor Simulator, the Gyrocompass System and Calibration Process Simulator, the Gyrocompass System Evaluation and Analysis Module. Each module has one or two graphic user interfaces (GUIs) as user interfaces for simulation components selection and parameter setting. The modular architecture of GMSS makes it very flexible for programming and testing. And, the component-based software development technology greatly eases system extension and maintenance. The simulators can be used as either an off-line tool or as a real-time simulation tool. The realization of the GMSS can be based on any computer platforms, for it is written in high level language and tools and is portable. The stochastic signal analysis and sensor testing and modeling tools comprise a suite of generic statistical analysis software, including Allan Variance and PSD analysis tools, which are available to every GMSS module and greatly enhanced the system functionality.

A system for simulating interdependencies between multiple critical physical infrastructure models includes a first infrastructure data model that models a first physical infrastructure; a second infrastructure data model that models a second physical infrastructure, wherein the second physical infrastructure is a different physical infrastructure from the first physical infrastructure; a simulation engine adapted to automatically produce a change in the second infrastructure data model in response to a change in the first infrastructure data model; a user interface permitting a user to interact with the simulation engine; wherein the user interface and the simulation engine are configured such that the user can disable an element of the first physical infrastructure, and subsequently re-enable the element of the first physical infrastructure; wherein the first infrastructure data model comprises a transport network; and wherein the second infrastructure data model comprises a channel network.

The invention discloses a system for the three-dimensional interactive virtual arrangement of a large-scale artistic performance, which enables a user to freely establish and select performance elements comprising performers, props, costumes, lighting and the like required to be edited in a three-dimensional performance scene, set the attributes and the actions of the performance elements and theoccurrence time and the occurrence sequence of the actions, and see dynamic simulation results in real time. The system achieves the simulations of the performance formation and the performance actions of large-scale performing groups in the content of the large-scale artistic performance, and the modeling and the simulations of the performance elements of the props, the costumes, the lighting andthe like; the system also provides a performance material library containing three-dimensional models of the performance elements of the costumes, the props, the lighting and the like and the commonperformance actions; besides, the system achieves the digitalization and the persistence of the creation content of the performance, namely the work products of creative personnel are required to be capable of being stored, modified and reused digitally. The establishment and the application of the system can greatly improve the working efficiency of the creative personnel, improve the arrangementquality, and achieve great economic benefits with a smaller cost.

A volume phantom for radiation therapy verification employs film held in a spiral configuration within a equalizing ring of attenuating material. The ring provides improved uniformity in radiation measurement and may be extended, for example, to a hemisphere to provide improved modeling and simulation of treatments in the region of the head.

A surveillance system and method for identifying chemical, biological or nuclear attacks or hazards occurring within a large area which combines data derived from a modeling and simulation operation with a surveillance data input. The modeling and simulation operation involves continuous periodic runs of multiple scenarios for various biological, chemical and nuclear agents in various concentrations for a given location. Using real time weather data for each location, a model is made in a database of the effect various concentrations of agents would have at that location and this simulated model is processed. The surveillance data input monitors actual human signs and symptoms for the modeled area. This data with real time weather data is compared with the results of modeling and simulation data for the area to determine if a pattern matching that for any modeled agent is present.

The present disclosure generally includes a projective modeling and simulation system which produces an Outcome Model which reflects the projection of a structured assertion across the elements composing a Reference Data Model, where the projected contention is embodied within a structured Assertion Model and an optionally associated but similarly structured Apportionment sub-Model where the Outcome Model unifies the subject matter of the Reference Data Model with the Assertion-Apportionment Model pair.

The invention provides a posting predication system based on a neural network technique. The system adopts phase-space reconstruction for realizing non-linear time sequence analysis and adopts a Browser/Server structure based on a J2EE platform. The system structurally includes a data pre-processing module, a predication analysis management module and predication modeling and simulation interface software and has characteristics of high convergence rate and low training error. The predication precision of established models is good. However, selection of a range of neural network training samples should be paid attention. Sample quantity can be reduced appropriately for predication of posting concerning to emergencies and samples of too early time may not be applied. In application, damage of models due to abnormal values should be paid attention and the abnormal values should be checked and adjusted, so that the model predication precision can be guaranteed. The established models adopt quantitative analysis and acquire a certain precision. Besides, the perception performance is good.

The invention provides an integrated avionics system modeling and simulation platform based on MDA. The integrated avionics system modeling and simulation platform comprises an integrated development framework, a basic pixel module assembly, an avionics system pixel module assembly, a semantic model assembly, an attribute dynamic mapping assembly, a class code generation assembly, an operation control logic assembly, an integrated avionics system universal framework and a man-machine interface framework.

The invention discloses a three-dimensional real scene modeling system based on aviation oblique photograph measurement. The using method of the system comprises the steps of estimating the elevation range of a target, conducting aviation oblique photographing on the target, and recording the elements of exterior orientation and elements of interior orientation, corresponding to a camera, of all photos; taking a pixel point a in a photo A, finding a first ray, and cutting out the segment, within the range between h1 and h2, of the first ray, namely a first spatial segment; taking a photo B, projecting the first spatial segment on the photo B, obtaining a first epipolar ray, and finding a homonymy pixel point b; connecting the homonymy pixel point b with the center point of the camera when the camera is used for photographing the photo B, and extending the connecting line towards the target point to form a second ray, wherein the point of intersection of the first ray and the second ray is the three-dimensional space coordinate point of the pixel point a. The scheme effectively achieves three-dimensional real scene modeling and simulation and fills the blank in the field. Three-dimensional digital city and urban residences are obtained quickly, and the problem that a real-time three-dimensional model is hard to obtain currently is solved.

The invention provides a Saber-based circuit failure simulation analyzing method. The method is characterized by comprising the following steps: 1, performing Saber circuit function modeling and simulation; 2, determining the failure mode of a device to be simulated; 3, modeling the failure; 4, injecting the failure; 5, simulating a failed circuit to generate a failure simulation result; 6, setting a failure criterion; and 7, giving a failure analyzing result. Regarding the problem that the conventional circuit failure simulation can be only used for digital circuits, the method provides a practical failure simulation method based on the digital-analog hybrid simulation platform Saber. Furthermore, many failure simulation models which cannot be solved by predecessors are added, and 48 failure modes can be simulated. Realization of automatic failure injection greatly improves the failure simulation efficiency. The direct interface between Saber and failure simulation is broken through,and an effective signal failure determination method is provided.

A Discrete Event System model created or provided in a time domain modeling and simulation environment and/or an event domain modeling and simulation environment may be divided into multiple independent regions, e.g. “subgraphs”, to achieve interleaved execution of the components from different domains. The subgraphs are automatically identified by the modeling and simulation environment during the compilation. Each subgraph consists of one or more interconnected event-driven components. Each subgraph is associated with an event calendar that controls the execution of the associated subgraph. Such multiple event calendar design enables multi-domain simulation, where event-driven components modeled by an event domain modeling environment and time-driven components modeled by a time domain modeling environment are simulated in an integrated fashion.

A method of predicting behavior of a drilling assembly includes: generating a mathematical representation of a geometry of each of a plurality of components of a drilling assembly, the plurality of components including a plurality of cutters and one or more additional components configured to at least one of: support the plurality of cutters and operably connect the plurality of cutters to the drill string, the one or more additional components including a drill bit crown; simulating one or more operating conditions incident on the drilling assembly representation, and simulating an interaction between the plurality of components and an earth formation; and predicting physical responses of the drilling assembly representation to the one or more conditions.

The present invention relates to systems and methods that predict behaviors of alerting and filtering systems based on simulation from messaging logs. By logging contextual information, such as the presence, activity, and availability of users, as well as incoming messages and their properties, forecasting services can be created that serve to provide users with an interactive “what if” capability, informing them what they might expect in terms of future behaviors of an automated message alerting and/or filtering system, based on recent messaging histories. A log of the history of incoming messages and contextual data is examined by modeling and simulation tools. The tools reveal the influence of alternate settings on the system's behavior, in response to an expected stream of incoming messages, providing users with insights about how control settings affect alerting, filtering, or routing behaviors.

The invention discloses a ground point cloud segmentation method based on a three-dimensional laser radar. The method comprises the following steps that: S100: obtaining ground point cloud data, carrying out scanning on the basis of the ground three-dimensional laser radar to obtain spatial information data, and meanwhile, combining with a GPS (Global Positioning System) to obtain ground data; S200: carrying out data processing, establishing a rectangular coordinate system, converting the coordinate of the obtained ground data into the rectangular coordinate system, and meanwhile, adopting equal-thickness layering according to contour line and contour interval properties; S300: carrying out ground point cloud information segmentation, and classifying the ground laser point cloud information obtained by scanning; S400: carrying out denoising processing, classifying noise data, and independently carrying out noise processing on the noise data; and S500: carrying out image segmentation display, and directly extracting building elevation information through a gridding way. Through a way of combining positioning with laser scanning, more comprehensive ground point cloud data is obtained, meanwhile, the accuracy of the point cloud data is improved through the ways of classified segmentation and step-by-step denoising, and convenience is brought to subsequent modeling and simulation.

The present invention provides a complex distribution network multi-time-scale digital-analog hybrid simulation system and a simulation method therefor, and aims to solve problems of multi-time-scale modeling and simulation of the existing complex distribution network and simulation precision and efficiency of the complex distribution network. The present invention proposes a complex distribution multi-time-scale digital-analog hybrid simulation scheme, and designs a digital-analog hybrid interface apparatus and a coordination mechanism, so that multi-time-scale real-time simulation of complex distribution network devices (such as a power electronic device containing a complex topology structure and a novel control structure and a novel control policy) and multi-time-scale simulation analysis that contains a distributed power source, such as a fan, a photovoltaic device and a combustion turbine, and an electric vehicle connected/disconnected to a network and that has an interactive effect on the distribution network. The method provided by the present invention is capable of promoting the development of the cutting-edge new technology of the new-generation distribution network, improving the level of distribution network operation control and analysis, and providing more powerful, longer-term and deeper support for power grid production, running and management from the angles of distribution network planning, designing, operation regulating and the like.

The invention relates to a detecting system and method for virtual synchronous generator grid connection based on hardware-in-the-loop simulation. The detecting system comprises the following sequentially connected parts: an upper computer, a lower computer simulator, an I/O module, a controller for a virtual synchronous generator to be tested and a digital waveform recorder. The detecting system for virtual synchronous generator grid connection based on hardware-in-the-loop simulation can provide system modeling and simulation for various types of virtual synchronous generators and different types of energy storage units, photovoltaic power generation units and wind turbines of the generators. As a new detecting method for grid connection performance of a power generation unit of a virtual synchronous generator, the detecting method can perform system-level hardware-in-the-loop simulation detection on the basis of completing the mathematical modeling for the virtual synchronous generator to be tested, the integration level is high, and the detecting requirement for grid connection performance of virtual synchronous generators of different voltage levels in the market can be met.

The invention discloses a pipeline planning method and device based on data driven modeling and simulation optimization, and belongs to the field of production line planning and design. The method comprises a step of performing rapid analysis on each data of an assembly line based on data driving and building a data model, a step of building a simulation model based on the data model through hierarchical modeling and driving the simulation model to run, outputting an simulation result and evaluating a result according to set indicators, continuously optimizing and improving the unreasonable allocation of device resources, and quickly performing reasonable pipeline planning and design. According to the invention, the model is quickly established through data driving, the model has good flexibility and reusability, the simulation model can be driven by modifying external data to run different simulation tests, the flexibility, versatility and portability of the simulation model are enhanced, the planning efficiency is improved, and the efficiency is improved and the correctness is ensured on the basis of automatic rapid modeling.

The present invention relates to a simultaneous system for finding and assessing vulnerabilities in a network, which comprises: A. A mapping unit for: (a) scanning the network, and each time a new element is found, reporting its IP address to a profiling unit; (b) sequentially receiving from the profiling unit profile records of said newly found elements; (c) sequentially extracting tables from those elements which their profile record indicates that they are of the network equipment type; and (d) sequentially reporting to a modeling and simulating unit topology records which include said found IPs, and for those elements being of a network equipment type, said topology records also include said extracted tables; B. A profiling unit for sequentially receiving IP addresses of network elements from the mapping unit, investigating each of said elements, forming a profile record for each of said elements, and sequentially transferring said profile records to both the mapping unit and to a vulnerability assessment unit; C. A vulnerability assessment unit for: (a) sequentially receiving profile records from the profiling unit; (b) determining a list of those vulnerability tests that have to be performed on each element; (c) performing for each element those vulnerability tests that are included in its corresponding list, and determining for each test a passed or failed result; and (d) sequentially reporting to an modeling and simulation unit for each performed test, the IP of the element, the identity code of the element, and the passed or failed result; and D. A modeling and simulation unit for: (a) sequentially receiving topology records from the mapping unit, and each time a topology record is received, adding or subtracting respectively the corresponding element from a model of the network which is maintained at the modeling and simulation unit; (b) sequentially receiving from the vulnerability assessment unit vulnerability test (VT) results; and (c) sequentially analyzing the model currently existing at the modeling and simulation unit for the possibility of exploiting vulnerabilities of the network.