scholarly journals Bridging the gap Why we need to enhance current simulation models

2020 ◽  
Vol 5 ◽  
Author(s):  
Kneidl Angelika
Keyword(s):  
State Of The Art ◽  
Simulation Models ◽  
Capacity Analysis ◽  
Passenger Flow ◽  
Flow Through

Many models that simulate evacuations are state of the art and provide realistic insight to their users. However, simulating everyday situations, such as visitor flow through a museum or passenger flow through an airport, presents marked challenges; existing models reach their limit here. This contribution will introduce and highlight the gap between existing egress models and the difficulties found simulating, for instance, passenger flow or capacity analysis.

scholarly journals Solid-state nanopore systems: from materials to applications

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yuhui He ◽  
Makusu Tsutsui ◽  
Yue Zhou ◽  
Xiang-Shui Miao
Keyword(s):  
Solid State ◽  
Recent Progress ◽  
State Of The Art ◽  
Ion Selectivity ◽  
Dna Origami ◽  
Fundamental Interest ◽  
Reverse Electrodialysis ◽  
Promising Application ◽  
Flow Through ◽  
Wall Materials

AbstractIon transport and hydrodynamic flow through nanometer-sized channels (nanopores) have been increasingly studied owing to not only the fundamental interest in the abundance of novel phenomena that has been observed but also their promising application in innovative nanodevices, including next-generation sequencers, nanopower generators, and memristive synapses. We first review various kinds of materials and the associated state-of-the-art processes developed for fabricating nanoscale pores, including the emerging structures of DNA origami and 2-dimensional nanopores. Then, the unique transport phenomena are examined wherein the surface properties of wall materials play predominant roles in inducing intriguing characteristics, such as ion selectivity and reverse electrodialysis. Finally, we highlight recent progress in the potential application of nanopores, ranging from their use in biosensors to nanopore-based artificial synapses.

scholarly journals Using Semantic Technology To Model Persona For Adaptable Agents

2021 ◽  
Author(s):  
Johannes Nguyen ◽  
Thomas Farrenkopf ◽  
Michael Guckert ◽  
Simon T. Powers ◽  
Neil Urquhart
Keyword(s):  
Road Traffic ◽  
State Of The Art ◽  
Software Agents ◽  
Simulation Models ◽  
Agent Model ◽  
Semantic Technology ◽  
Art Research

In state of the art research a growing interest in the application of agent models for the simulation of road traffic can be observed. Software agents are particularly suitable for the representation of travellers and their goal-oriented behaviour. Although numerous applications based on these types of models are already available, the options for modelling and calibration of the agents as goal-oriented individuals are either simplified to aggregated parameters or associated with overly complex and opaque implementation details. This makes it difficult to reuse available simulation models. In this paper, we demonstrate how the combination of persona models together with semantic methods can be applied to achieve a well-structured agent model that allows for improved reusability.

RELAP5/MOD3 Code Verification Through PWR Pressure Vessel Small Break LOCA Tests in OECD/NEA ROSA Project

2008 ◽  
Author(s):  
Hideo Nakamura ◽  
Tadashi Watanabe ◽  
Takeshi Takeda ◽  
Hideaki Asaka ◽  
Masaya Kondo ◽  
...  
Keyword(s):  
State Of The Art ◽  
Simulation Models ◽  
Predictive Capability ◽  
Experimental Conditions ◽  
Energy Agency ◽  
Test Analysis ◽  
Post Test ◽  
Complex Phenomena ◽  
Reactor Accidents ◽  
Relap5 Code

The Japan Atomic Energy Agency (JAEA) started OECD/NEA ROSA Project in 2005 to resolve issues in the thermal-hydraulic analyses relevant to LWR safety through the experiments of ROSA/LSTF in JAEA. More than 17 organizations from 14 NEA member countries have joined the Project. The ROSA Project intends to focus on the validation of simulation models and methods for complex phenomena that may occur during DBEs and beyond-DBE transients. Twelve experiments are to be conducted in the six types. By utilizing the obtained data, the predictability of codes is validated. Nine experiments have been performed so far in the ROSA Project to date. The results of two out of these experiments; PV top and bottom small-break (SB) LOCA simulations are studied here, through comparisons with the results from pre-test and post-test analyses by using the RELAP5/MOD3.2 code as a typical and well-utilized/improved best estimate (BE) code. The experimental conditions were defined based on the pre-test (blind) analysis. The comparison with the experiment results may clearly indicate a state of the art of the code to deal with relevant reactor accidents. The code predictive capability was verified further through the post-test analysis. The obtained issues in the utilization of the RELAP5 code are summarized as well as the outline of the ROSA Project.

Simulation of frequency tracking loops with complex targets

SIMULATION ◽  
1967 ◽  
Vol 8 (2) ◽  
pp. 111-115
Author(s):  
J.O. Engle ◽  
C.J. Nisson
Keyword(s):  
Signal Processing ◽  
State Of The Art ◽  
Simulation Models ◽  
Council Meeting ◽  
Frequency Tracking ◽  
Modern Equipment ◽  
Tracking Loops ◽  
Simple Picture

This paper was written for the analog user to relate some of our experience in the area of signal processing (in this case signal processing by a radar receiver) to fit the theme of the Eastern Simulation Council meeting at which it was presented. "In the paper we attempted to give a complete but simple picture; by describing the signals and system, de veloping the simulation models, instrumenting the models with available computing equipment and finally by dis cussing simulation difficulties. (We wish that we had more modern equipment so that the instrumentation, particu larly of the dc models, could be more significant relative to state-of-the-art.)"

A High Performance PFB System for Utility Application

1987 ◽  
Author(s):  
Paul A. Berman ◽  
Jeffrey A. Hynds
Keyword(s):  
Power System ◽  
High Performance ◽  
State Of The Art ◽  
Combustion Products ◽  
Volume Flow ◽  
Power Cycle ◽  
Turbine Inlet ◽  
Alkali Vapors ◽  
Fluid Bed ◽  
Flow Through

In the traditional pressurized fluid bed (PFB) power system, the PFB is located in the highest pressure portion of the power cycle, Figure 1. This results in the smallest volume flow through the PFB, but also requires the combustion products to flow through the entire expansion train. This is not expected to be a major problem when the PFB temperature is limited to 1600°F for effective sulfur capture and to avoid alkali vapors in the products of combustion. However, when topping combustion is added ahead of the turbine so as to reach state-of-the-art turbine inlet temperatures, a major risk for turbine corrosion and fouling develops.

State-of-the-art crowd motion simulation models

2013 ◽  
Vol 37 ◽  
pp. 193-209 ◽  
Author(s):  
Dorine C. Duives ◽  
Winnie Daamen ◽  
Serge P. Hoogendoorn
Keyword(s):  
State Of The Art ◽  
Simulation Models ◽  
Motion Simulation ◽  
Crowd Motion

MODELING ELECTRON TRANSPORT IN MOSFET DEVICES: EVOLUTION AND STATE OF THE ART

2003 ◽  
Vol 13 (03) ◽  
pp. 701-725 ◽  
Author(s):  
ANTONIO ABRAMO
Keyword(s):  
Electron Transport ◽  
Information Technologies ◽  
Carrier Transport ◽  
State Of The Art ◽  
Simulation Models ◽  
The State ◽  
Transport Modeling ◽  
Simulation Tools ◽  
Device Optimization ◽  
Highly Skilled

The progress of silicon technologies we have witnessed in the last twenty years has traced the path to the unprecedented revolution of information technologies, which has changed almost everybody's lifestyles. Apparently, this has happened with a little big help from TCAD tools. Big, because few major advancements have been achieved through the clever exploitation of non-conventional simulation tools, and because everyday device optimization deeply relies on TCAD tools. Little, because the qualitative feeling is that the technology would have progressed anyway, through the work of many highly-skilled technology experts, even without simulation guidelines. The purpose of this paper is to review the state-of-the-art of the field of the transport modeling of electron devices, trying to grasp the essence of the most relevant simulation models proposed so far, whence to contribute to spur the activity on the fundamental modeling of carrier transport.

scholarly journals An Evaluation of Decadal Probability Forecasts from State-of-the-Art Climate Models

2013 ◽  
Vol 26 (23) ◽  
pp. 9334-9347 ◽  
Author(s):  
Emma B. Suckling ◽  
Leonard A. Smith
Keyword(s):  
Climate Models ◽  
State Of The Art ◽  
Simulation Models ◽  
Empirical Models ◽  
Regular Component ◽  
Climate Services ◽  
Global Mean Temperature ◽  
Operational Forecasts ◽  
Earth’S Climate ◽  
Global Mean

While state-of-the-art models of Earth's climate system have improved tremendously over the last 20 years, nontrivial structural flaws still hinder their ability to forecast the decadal dynamics of the Earth system realistically. Contrasting the skill of these models not only with each other but also with empirical models can reveal the space and time scales on which simulation models exploit their physical basis effectively and quantify their ability to add information to operational forecasts. The skill of decadal probabilistic hindcasts for annual global-mean and regional-mean temperatures from the EU Ensemble-Based Predictions of Climate Changes and Their Impacts (ENSEMBLES) project is contrasted with several empirical models. Both the ENSEMBLES models and a “dynamic climatology” empirical model show probabilistic skill above that of a static climatology for global-mean temperature. The dynamic climatology model, however, often outperforms the ENSEMBLES models. The fact that empirical models display skill similar to that of today's state-of-the-art simulation models suggests that empirical forecasts can improve decadal forecasts for climate services, just as in weather, medium-range, and seasonal forecasting. It is suggested that the direct comparison of simulation models with empirical models becomes a regular component of large model forecast evaluations. Doing so would clarify the extent to which state-of-the-art simulation models provide information beyond that available from simpler empirical models and clarify current limitations in using simulation forecasting for decision support. Ultimately, the skill of simulation models based on physical principles is expected to surpass that of empirical models in a changing climate; their direct comparison provides information on progress toward that goal, which is not available in model–model intercomparisons.

Sign in / Sign up

Export Citation Format

Share Document