An Evacuation Route Model of Crowd Based on Emotion and Geodesic

Making unconventional emergent plan for dense crowd is one of the critical issues of evacuation simulations. In order to make the behavior of crowd more believable, we present a real-time evacuation route approach based on emotion and geodesic under the influence of individual emotion and multi-hazard circumstances. The proposed emotion model can reflect the dynamic process of individual in group on three factors: individual emotion, perilous field, and crowd emotion. Specifically, we first convert the evacuation scene to Delaunay triangulation representations. Then, we use the optimization-driven geodesic approach to calculate the best evacuation path with user-specified geometric constraints, such as crowd density, obstacle information, and perilous field. Finally, the Smooth Particle Hydrodynamics method is used for local avoidance of collisions with nearby agents in real-time simulation. Extensive experimental results show that our algorithm is efficient and well suited for real-time simulations of crowd evacuation.

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IoT-based real time intelligent routing for emergent crowd evacuation

Library Hi Tech ◽

10.1108/lht-11-2017-0251 ◽

2019 ◽

Vol 37 (3) ◽

pp. 604-624

Author(s):

Yanlan Mei ◽

Ping Gui ◽

Xianfeng Luo ◽

Benbu Liang ◽

Liuliu Fu ◽

...

Keyword(s):

Decision Making ◽

Real Time ◽

Programming Model ◽

Emergency Evacuation ◽

Guidance System ◽

Programming Approach ◽

Metro Station ◽

Content Type ◽

Crowd Evacuation ◽

Evacuation Route

Purpose The purpose of this paper is to take advantage of Internet of Things (IoT) for intelligent route programming of crowd emergency evacuation in metro station. It is a novel approach to ensure the crowd safety and reduce the casualties in the emergency context. An evacuation route programming model is constructed to select a suitable evacuation route and support the emergency decision maker of metro station. Design/methodology/approach The IoT technology is employed to collect and screen information, and to construct an expert decision model to support the metro station manager to make decision. As a feasible way to solve the multiple criteria decision-making problem, an improved multi-attributive border approximation area comparison (MABAC) approach is introduced. Findings The case study indicates that the model provides valuable suggestions for evacuation route programming and offers practical support for the design of an evacuation route guidance system. Moreover, IoT plays an important role in the process of intelligent route programming of crowd emergency evacuation in metro station. A library has similar structure and crowd characteristics of a metro station, thus the intelligent route programming approach can be applied to the library crowd evacuation. Originality/value The highlights of this paper are listed as followings: the accuracy and accessibility of the metro station’s real-time information are improved by integrating IoT technology with the intelligent route programming of crowd emergency evacuation. An improved MABAC approach is introduced to the expert support model. It promotes the applicability and reliability of decision making for emergency evacuation route selection in metro station. It is a novel way to combine the decision-making methods with practice.

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A Proposal of a Haptic System for Real-Time Interaction with Clay-Like Objects

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1079-1080.631 ◽

2014 ◽

Vol 1079-1080 ◽

pp. 631-637

Author(s):

Lan Hai Liu ◽

Satoshi Miyake ◽

Katsuhito Akahane ◽

Makoto Sato

Keyword(s):

Real Time ◽

Particle System ◽

High Viscosity ◽

Fluid Simulation ◽

Time Interaction ◽

Time Simulation ◽

Particle Hydrodynamics ◽

Smoothed Particle ◽

Novel Method ◽

The Stability

People often interact with deformable objects when they are kneading clay or making traditional desserts, either directly with their hands and fingers or through tools. Haptic interactions with virtual clay-like objects would significantly make the simulations more interesting and more real. However, to achieve a stable and real-time simulation of a clay-like particle system with high viscosity is challenging. In this research, we propose a novel method that allows real-time haptic interaction with clay-like objects. The particle system is based on a SPH(Smoothed-Particle Hydrodynamics) model, and the procedure of the conventional SPH method for fluid simulation is improved for simulating a particle system especially of high viscosity. The haptic rendering is done by a string-based haptic interface SPIDAR-G. We evaluate the performance and the stability of the proposed method in the end.

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Integration effects of UAVs in non-segregated airspace

Aircraft Engineering and Aerospace Technology ◽

10.1108/aeat-08-2020-0187 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Tamer Savas ◽

Oznur Usanmaz ◽

Ozlem Sahin ◽

Ertan Çınar ◽

Murat Karaderili

Keyword(s):

Real Time ◽

Simulation Method ◽

Flight Time ◽

Flight Distance ◽

Content Type ◽

Time Simulation ◽

Proposed Model ◽

Comparison Results ◽

Quantitative Results ◽

Real Time Simulations

Purpose The study aims to design a new route model for unmanned aerial vehicles (UAVs) to integrate them into non-segregated airspace. Design/methodology/approach The proposed route model was assessed and validated through real-time simulations. Findings The comparison results of baseline and proposed route model show that a reduction of 38% and 41% in the total flight time and total flight distance were obtained in favour of the proposed model, respectively. Practical implications The proposed route model can be applied by airspace designers and UAV users to perform safe and efficient landing in non-segregated airspace. Originality/value In this study, a new proposed route model is constructed for UAVs. Quantitative results, using a real-time simulation method, are achieved in terms of flight distance and flight time.

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High-Speed Real-Time Simulators for Engineering Design

Acta Polytechnica ◽

10.14311/738 ◽

2005 ◽

Vol 45 (4) ◽

Author(s):

R. E. Crosbie ◽

N. G. Hingorani

Keyword(s):

Engineering Design ◽

Real Time ◽

Computer Simulations ◽

High Speed ◽

Operator Training ◽

Real Time Simulation ◽

Automotive Systems ◽

Simulated Environments ◽

Time Simulation ◽

Real Time Simulations

The use of computer simulations is now an established technique in engineering design. Many of these simulations are used to predict the expected behavior of systems that are not yet built, or of existing systems in modes of operation, such as catastrophic failure, in which it is not feasible to test the real system. Another use of computer simulations is for training and testing purposes in which the simulation is interfaced to real hardware, software and/or a human operator and is required to operate in real-time. Examples are plant simulators for operator training or simulated environments for testing hardware or software components. The primary requirement of a real-time simulation is that it must complete all the calculations necessary to update the simulator outputs as well as all the necessary data I/O within the allotted frame time. Many real-time simulations use frame times in the range of a few milliseconds and greater.There is an increasing number of applications, for example in power electronics and automotive systems, in which much shorter frame rates are required. This paper reviews some of these applications and the approaches to real-time simulation that can achieve frame times in the range 5 to 100 microseconds.

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The Rate of Turn Required for Geographically Fixed Turns: A Formula and Fast-Time Simulations

Journal of Navigation ◽

10.1017/s0373463399008590 ◽

2000 ◽

Vol 53 (1) ◽

pp. 146-155 ◽

Cited By ~ 1

Author(s):

Max J. van Hilten ◽

Paul H. M. Wolkenfelt

Keyword(s):

Real Time ◽

Simulation Program ◽

Fast Time ◽

Real Time Simulation ◽

Time Simulation ◽

Tidal Stream ◽

Path Prediction ◽

Real Time Simulations ◽

Hydrodynamic Effects ◽

The Relationship

This paper concerns the derivation of a formula to follow geographically fixed turns in a homogeneous current or tidal stream. Until now, various well-founded but limited approximations have been used. In principle, all these approximations are based on the formula v = ω × R. One result of this research is the development and use of a fast-time simulation program. The initial aim was to illustrate to trainees the consequences and, in particular, the possible dangers of these approximations. The fast-time simulation program can be used in support of real-time simulation. Comparisons with real-time simulations carried out by the Dutch Pilots' Corporation (STODEL) indicate that the fast-time simulations generate turning-circle diameters that differ by a maximum 4 percent. The relationship with path-prediction is also dealt with. The possibility of applying the developed formulae in practice and for passage planning is currently under investigation. The fast-time simulation program has not been developed for one specific ship: apart from the use of an assumed position of the pivoting point at 1/3 of the ship's length from the bow, it does not take hydrodynamic effects into account.

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Simulation of Skeletal Muscles in Real-Time with Parallel Computing in GPU

Applied Sciences ◽

10.3390/app10062099 ◽

2020 ◽

Vol 10 (6) ◽

pp. 2099

Author(s):

Octavio Navarro-Hinojosa ◽

Moisés Alencastre-Miranda

Keyword(s):

Real Time ◽

Biological Tissue ◽

Graphics Processing Units ◽

Skeletal Muscles ◽

Shape Matching ◽

General Purpose ◽

Particle Hydrodynamics ◽

Reduced-Scale Models of Variable Speed Hydro-Electric Plants for Power Hardware-in-the-Loop Real-Time Simulations

Energies ◽

10.3390/en13215764 ◽

2020 ◽

Vol 13 (21) ◽

pp. 5764

Author(s):

Baoling Guo ◽

Amgad Mohamed ◽

Seddik Bacha ◽

Mazen Alamir ◽

Cédric Boudinet ◽

...

Keyword(s):

Real Time ◽

Simulation System ◽

Hardware In The Loop ◽

Variable Speed ◽

Real Time Simulation ◽

Time Simulation ◽

Scale Models ◽

Real Time Simulations ◽

Reduced Scale ◽

Modelling Approach

Variable Speed Hydro-Electric Plant (VS-HEP) equipped with power electronics has been increasingly introduced into the hydraulic context. This paper is targeting a VS-HEP Power Hardware-In-the-Loop (PHIL) real-time simulation system, which is dedicated to different hydraulic operation schemes tests and control laws validation. Then, a proper hydraulic model will be the key factor for building an efficient PHIL real-time simulation system. This work introduces a practical and generalised modelling hydraulic modelling approach, which is based on ‘Hill Charts’ measurements provided by industrial manufacturers. The hydraulic static model is analytically obtained by using mathematical optimization routines. In addition, the nonlinear dynamic model of the guide vane actuator is introduced in order to evaluate the effects of the induced dynamics on the electric control performances. Moreover, the reduced-scale models adapted to different laboratory conditions can be established by applying scaling laws. The suggested modelling approach enables the features of decent accuracy, light computational complexity, high flexibility and wide applications for their implementations on PHIL real-time simulations. Finally, a grid-connected energy conversion chain of bulb hydraulic turbine associated with a permanent magnet synchronous generator is chosen as an example for PHIL design and performance assessment.

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Object-Oriented Modeling for Real-Time Simulation

10.1115/imece2000-2375 ◽

2000 ◽

Author(s):

Miguel A. Otaduy ◽

Ana I. Martínez ◽

Ana Vidarte ◽

Joseba Landaluze ◽

Raúl Reyero

Keyword(s):

Real Time ◽

Mathematical Formulation ◽

Object Oriented ◽

Simulation Models ◽

Mechatronic Systems ◽

Modeling Tools ◽

Real Time Simulation ◽

Time Simulation ◽

New Applications ◽

Real Time Simulations

Abstract The fast growing processing capability of digital circuits allows real-time simulation of mechatronic systems to embrace new applications at a lower cost. However, the development of real-time simulation models is still a difficult task. Object-oriented modeling, along with efficient mathematical formulation, seems to solve this matter. The work covered by this paper was carried out in order to evaluate existing possibilities for the development of real-time simulations of mechatronic systems by means of object-oriented modeling tools.

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Survey of Finite Element Method-Based Real-Time Simulations

Applied Sciences ◽

10.3390/app9142775 ◽

2019 ◽

Vol 9 (14) ◽

pp. 2775 ◽

Cited By ~ 3

Author(s):

Dragan Marinkovic ◽

Manfred Zehn

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Real Time ◽

The Finite Element Method ◽

Typical Application ◽

Time Simulation ◽

Simulation Based ◽

Rapid Pace ◽

Real Time Simulations ◽

Element Method

The finite element method (FEM) has deservedly gained the reputation of the most powerful, highly efficient, and versatile numerical method in the field of structural analysis. Though typical application of FE programs implies the so-called “off-line” computations, the rapid pace of hardware development over the past couple of decades was the major impetus for numerous researchers to consider the possibility of real-time simulation based on FE models. Limitations of available hardware components in various phases of developments demanded remarkable innovativeness in the quest for suitable solutions to the challenge. Different approaches have been proposed depending on the demands of the specific field of application. Though it is still a relatively young field of work in global terms, an immense amount of work has already been done calling for a representative survey. This paper aims to provide such a survey, which of course cannot be exhaustive.

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Real-Time Simulation of Multiple Parallel Approaches

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/154193129303701715 ◽

1993 ◽

Vol 37 (17) ◽

pp. 1191-1195

Author(s):

Eric C. Neiderman

Keyword(s):

Real Time ◽

Traffic Control ◽

National Standards ◽

Flight Crew ◽

Human Capabilities ◽

Real Time Simulation ◽

Airport Capacity ◽

Time Simulation ◽

Aircraft Performance ◽

Real Time Simulations

This paper describes an ongoing program of real-time, interactive air traffic control simulations to test and evaluate the feasibility of conducting closely-spaced, Independent, instrument approaches to dual, triple, and quadruple parallel runways. Real-time simulations are used to test and evaluate the human, technological, and systemic issues critical to the implementation of independent multiple parallel approaches. These simulations quantitatively evaluate controller performance, pilot/aircraft performance, and airport capacity issues. Simulation data are also used in the assessment of risk associated with the operation. To address human capabilities and limitations, qualitative analyses are used to assess the opinions of controllers, flight crew members, simulation technical observers, and recognized subject matter experts. This paper describes the planning, implementation, data collection, analysis, and related issues involved in real-time simulation for the development of national standards for independent multiple parallel approaches.

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