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A discrete event simulation model for waiting time management in an emergency department:A case study in an Egyptian hospital

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International Journal of Modeling, simulation, and Scientific Computing 2021年第1期12卷 1-14页

作者： Israa Mohamed Faculty of Computers and Informatics Zagazig University Ash-Sharkia 44519Egypt

This paper presents a discrete event simulation model to help improving healthcare service provided by an emergency department at a private hospital at Zagazig,*** construct a patient flow division model by dividing patients according to their severity *** patients division and routing have significant evidence in improving health service in terms of waiting times and Length of Stay(LoS),there is a lack in a detailed system evaluation and implementation under this *** on system observation and health care provider’s interviews,a comprehensive and clear picture of the system has been drawn along with a conceptual model showing different patient flows through the studied system.A discrete event simulation model of the Emergency Department is built using collected *** operational scenarios were tested against the baseline scenario to study the impact of patient flow division,including different staff capacities and different patient *** indicate that waiting times and length of patient stay can be significantly improved under the proposed7 system configuration.

关键词： discrete event simulation healthcare simulation emergency departments patient flow analysis

discrete event simulation-Based Evaluation of a Single-Lane Synchronized Dual-Traffic Light Intersections

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Journal of Computer and Communications 2023年第10期11卷 82-100页

作者： Chimezie Calistus Ogharandukun Martin Abdullahi Monday Essien Joe Department of Electrical/Electronic and Computer Engineering Veritas University Abuja Nigeria Department of Pure and Applied Physics Veritas University Abuja Nigeria Department of Computer Science Air Force Institute of Technology Kaduna Nigeria Department of Computer and Information Technology Veritas University Abuja Nigeria

This research involved an exploratory evaluation of the dynamics of vehicular traffic on a road network across two traffic light-controlled junctions. The study uses the case study of a one-kilometer road system modelled on Anylogic version 8.8.4. Anylogic is a multi-paradigm simulation tool that supports three main simulation methodologies: discrete event simulation, agent-based modeling, and system dynamics modeling. The system is used to evaluate the implication of stochastic time-based vehicle variables on the general efficiency of road use. Road use efficiency as reflected in this model is based on the percentage of entry vehicles to exit the model within a one-hour simulation period. The study deduced that for the model under review, an increase in entry point time delay has a domineering influence on the efficiency of road use far beyond any other consideration. This study therefore presents a novel approach that leverages discrete events simulation to facilitate efficient road management with a focus on optimum road use efficiency. The study also determined that the inclusion of appropriate random parameters to reflect road use activities at critical event points in a simulation can help in the effective representation of authentic traffic models. The Anylogic simulation software leverages the Classic DEVS and Parallel DEVS formalisms to achieve these objectives.

关键词： Multi-Core Processing Distributed Computing event-Driven Modelling discrete event simulation Data Analysis and Visualization

discrete event simulation to Evaluate Different Treatments of Diabetic Retinopathy Disease

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American Journal of Operations Research 2022年第6期12卷 250-260页

作者： Salma Kanoun Badreddine Jerbi Hichem Kamoun Laboratory of Modeling and Optimization for Decisional Industrial and Logistic Systems College of Economic Sciences and Management University of Sfax Sfax Tunisia Higher Institute of Management Gabes Tunisia Detached to Quassim University College of Business and Economics Saudi Arabia

Modeling approach using discrete event simulation has been proven to work well in modeling in health care. The aim of our paper is to propose a simulation approach which shows realistic models presenting different possible treatments in different stages of diabetic retinopathy. We have presented three models in order to choose the best treatment for diabetic retinopathy patients. The first model describes the flow of a patient through stages without any medical treatments. It takes 13 years to reach blindness. The second model which includes the laser photocoagulation treatments leads to blindness after 46 years. Then, the third model illustrates the involvement of vitrectomy operation and delays blindness by 23 years. To construct the models, data were taken from experienced doctors and professors of the ophthalmology department in the University hospital Habib Bourguiba and the endocrinology department in the University hospital Hedi Chaker in Sfax, Tunisia. Our objective is to delay reaching the blindness stage as late as possible. Three models were developed, verified and validated through many iterative implementations with ARENA simulation software.

关键词： Diabetic Retinopathy Modeling discrete event simulation Health Care ARENA simulation Software

A discrete event simulation Support System in C^(++)

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Systems Science and Systems Engineering 1996年第4期6卷 456-464页

作者： LIN Jian(The Management School Beijing University of Aeronautics and Astronautics Beijing 100083, China)

This paper describes a discrete simulation support system that forms major parts of most simulation program. The support system contains three main features which differ from the most of other simulation support systems. It follows a strict three phase structure; supports visual interactive simulation. The principles of designing and implementing of the system are explained module by module.

关键词： discrete event simulation simulation support system C￣(++) three phase approach

Parallel architecture and optimization for discrete-event simulation of spike neural networks

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Science China(Technological Sciences) 2013年第2期56卷 509-517页

作者： TANG YuHua ZHANG BaiDa WU JunJie HU TianJiang ZHOU Jing LIU FuDong Department of Computer Science and Technology School of ComputerNational University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology College of Mechatronic Engineering and Automation National University of Defense Technology

Spike neural networks are inspired by animal brains,and outperform traditional neural networks on complicated ***,spike neural networks are usually used on a large scale,and they cannot be computed on commercial,off-the-shelf computers.A parallel architecture is proposed and developed for discrete-event simulations of spike neural ***,mechanisms for both parallelism degree estimation and dynamic load balance are emphasized with theoretical and computational *** results show the effectiveness of the proposed parallelized spike neural network system and its corresponding support components.

关键词： spike neural network discrete event simulation intelligent parallelization framework

Performance-driven design with the support of digital tools： *** event simulation and space syntax on the design of the emergency department

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Frontiers of Architectural Research 2014年第3期3卷 250-264页

作者： David Morgareidge Hui CAI Jun JIA RTKL Associates Inc. 1717 Pacific Avenue Dallas TX 75201 USA Department of Architectural Studies University of Missouri 137 Stanley Hall Columbia MO 65211 USA

Ptanning the design of the emergency department （ED） is a complex process. Hospital readers and architects must consider many complex and interdependent factors, including evolving market demands, patient volume, care models, operational processes, staffing, and medical equipment. The application of digital toots, such as discrete event simulation （DES） and space syntax analysis （SSA）, arrows hospital administrators and designers to quantitativety and objectively optimize their facilities. This paper presents a case study that utitized both DES and SSA to optimize the care process and to design the space in an ED environment. DES was apptied in three phases： master planning, process improvement in the existing ED, and designing the new ED. SSA was used to compare the new design with the existing layout to evatuate the effectiveness of the new design in supporting visuat surveiltance and care coordination. This case study demonstrates that DES and SSA are effective toots for facilitating decision-making retated to design, reducing capital and operational costs, and improving organizational performance. DES focuses on operational processes and care flow. SSA complements DES with its strength in linking space to human behavior. Combining both tools can lead to high-performance ED design and can extend to broad applications in health care.

关键词： discrete event simulation Space syntax analysis Emergency depart-ment Health care design United States Performance-drivendesign

Evaluation of the impact of commodity price change on mine plan of underground mining

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International Journal of Mining Science and Technology 2015年第3期25卷 375-382页

作者： Salama Abubakary Nehring Micah Greberg Jenny Division of Mining and Geotechnical Engineering Department of CivilMining and Environmental EngineeringLulea University of Technology School of Mechanical and Mining Engineering The University of Queensland

Fluctuations in commodity prices should influence mining operations to continually update and adjust their mine plans in order to capture additional value under new market conditions. One of the adjustments is the change in production sequencing. This paper seeks to present a method for quantifying the net present value(NPV) that may be directly attributed to the change in commodity prices. The evaluation is conducted across ten copper price scenarios. discrete event simulation combined with mixed integer programming was used to attain a viable production strategy and to generate optimal mine plans. The analysis indicates that an increase in prices results in an increased in the NPV from$96.57M to $755.65M. In an environment where mining operations must be striving to gain as much value as possible from the rights to exploit a finite resource, it is not appropriate to keep operating under the same mine plan if commodity prices alter during the course of operations.

关键词： Mine planning Underground mining Commodity price discrete event simulation Mixed integer programming

Formal verification with HiLLS-specified models:A further step in multi-analysis modeling of complex systems

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International Journal of Modeling, simulation, and Scientific Computing 2019年第5期10卷 82-107页

作者： Kehinde G.Samuel Oumar Maiga Mamadou K.Traor′e frican University of Science&Technology AbujaNigeria Universit´e des Sciences des Techniques et des Technologies Bamako Mali University of Bordeaux IMS CNRS UMR 5218 France

The multi-analysis modeling of a complex system is the act of building a family of models which allows to cover a large spectrum of analysis methods(such as simulation,formal methods,enactment,...)that can be performed to derive various properties of this *** High-Level Language for Systems Specification(HiLLS)has recently been introduced as a graphical language for discrete event simulation,with potential for other types of analysis,like enactment for rapid system *** defines an automata language that also opens the way to formal *** paper provides the building blocks for such a *** way,a unique model can be used not only to perform both simulation and enactment experiments but also to allow the logical analysis of properties without running any ***,it saves from the effort of building three different analysis-specific models and the need to align them semantically.

关键词： discrete event System Specification(DEVS) High Level Language for Systems Specification(HiLLS) multi-analysis modeling discrete event simulation model checking

A methodology for assessing the urban supply of on-street delivery bays

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Green Energy and Intelligent Transportation 2022年第3期1卷 63-72页

作者： Antonio Comi JoséLuis Moura Sara Ezquerro University of Rome Tor Vergata RomeItaly University of Cantabria SantanderSpain

The loading and unloading operations carried out by transport and logistics operators have a strong impact on city mobility if they are not performed *** loading/unloading bays,i.e.,delivery bays(DB),are not available for freight vehicle operations,operators may opt to double park or park on the sidewalk where there is no strong enforcement of these laws,with significant impact on *** paper proposes a methodology for verifying and designing the number of delivery bays needed for freight vehicles for not interfere with cars or *** methodology consists of two stages:in the first stage,an initial estimation is made using queueing ***,in the second stage,using such tentative scenario,in order to take into account the system stochasticity involving different entities,a discrete event simulation is performed to more realistically verify and upgrade(if necessary)the number of delivery bays to obtain the expected *** methodology was applied in the inner area of Santander(Spain).The study area was subdivided into 29 zones where the methodology was applied *** results indicated that none of these zones currently have an optimal number of delivery bays to satisfy *** some zones,there is an excess of delivery bays,although in most of them,there is a deficit which can cause significant impacts on *** method proposed can be an effective tool to be used by city planners for improving freight operations in urban areas limiting the negative impacts produced in terms of internal and external costs.

关键词： Urban freight transportation On-street delivery bays discrete event simulation City logistics Urban goods movements