scholarly journals System Dynamic Model of Measures for Reducing the Number of Road Accidents Due to Wrong-way Movement on Motorways

2012 ◽  
Vol 21 (2) ◽  
pp. 85-91 ◽  
Author(s):  
Darja Topolšek ◽  
Martin Lipičnik
Keyword(s):  
System Dynamics ◽  
Dynamic Model ◽  
Traffic Safety ◽  
Traffic Management ◽  
System Dynamic ◽  
System Dynamic Model ◽  
Road Accidents ◽  
High Speeds ◽  
Wrong Direction ◽  
Individual Project

This paper provides a system dynamic model for reducing the number of motorway accidents due to wrong-way driving. Motorway accidents are often fatal due to high speeds. It is therefore necessary to carry out all the possible countermeasures in order to achieve adequate traffic management. One of the reasons for motorway accidents is driving in the wrong direction. Based on the analysis of the data on motorway accidents caused by driving in the wrong direction and based on the knowledge of individual project elements of junctions and slip roads, this paper will focus on this area. The possible countermeasures, presented here for preventing drivers from driving in the wrong direction on motorways drastically reduce the number of U-turn maneuvers that result in driving in the wrong direction and influence the level of safety on motorways. With the help of this model of system dynamics the countermeasures for reducing the number of such drivers will be confirmed and their effects will be shown. KEY WORDS: traffic safety, motorway, direction, (road) accidents, measures, system dynamics

scholarly journals The System Dynamic and Compram Methodologies for Modelling, Simulation and Forecasting of Road Safety of Uzbekistan

2021 ◽  
Vol 51 (3) ◽  
pp. 49-63
Author(s):  
Jamshid Abdunazarov ◽  
Miroslava Mikusova ◽  
Kyandoghere Kyamakya
Keyword(s):  
System Dynamics ◽  
Traffic Safety ◽  
Road Safety ◽  
Traffic Management ◽  
Software Tool ◽  
Complex Problem ◽  
System Dynamic ◽  
Road Mortality ◽  
Road Accidents ◽  
Reported Data

Abstract In Uzbekistan, about 2,000 people die every year as a result of a traffic accident. At the same time, according to the Pulitzer Centre on Crisis Reporting, the Republic has the lowest rate in road mortality among the countries in the Central Asian region - for every 100,000 people, it is 11.32 people. Losses from road accidents in Uzbekistan equivalent up to 2.8% of GDP that is also one of the lowest indicators. But according to traffic safety experts, the losses from accidents are greater than reported data. Nowadays there are a lot of methods to analyse and ensure road safety and traffic management on the roads. The authors believe that road safety is a complex societal problem not only in Uzbekistan but all over the world. One of these methods is System Dynamic (SD) and COMplex PRoblem hAndling Methodology (COMPRAM). In this work, the Vensim PLE SD software tool (it is one SD tool amongst many others) has been used to perform the SD modelling of the case study at hand. In the methods of system dynamics, a computer model is created using a graphical technique for constructing flow diagrams and causal relationships of the system under study and then simulated on a computer. COMPRAM allows us to figure out the way to handle complex societal problems while involving a System Dynamics (SD) simulation option. There are similarities between COMPRAM and the traditional way of analysing road safety. In traditional ways, each element or factor is studied as a separate phenomenon. These indicators are studied in the stages of COMPRAM. This article has been studied a different aspect of how road accidents happen. The developed a comparison (according to six criteria) of the different modelling paradigms which have been historically used to assess road safety. Also, the authors made a comparison of the COMPRAM methodology with the traditional road safety assessment approach to highlight similarities and differences.

ICT Powered Strategic Flexibility System Dynamic Model

2014 ◽  
Vol 3 (1) ◽  
pp. 90-110 ◽  
Author(s):  
Agnes Mindila ◽  
Anthony Rodrigues ◽  
Dorothy McCormick ◽  
Ronald Mwangi
Keyword(s):  
System Dynamics ◽  
Strategic Management ◽  
Dynamic Model ◽  
Dynamic Capabilities ◽  
System Dynamic ◽  
Strategic Flexibility ◽  
System Dynamic Model ◽  
Sustainable Competitive Advantage ◽  
Modeling Methodology ◽  
The Impact

Resource-Based View (RBV) of the firm in strategic management literature focuses on firm internal endowments in terms of resources, capabilities and dynamic capabilities for their development. By establishing a learning mechanism, where they are able to adapt and influence the environment, enterprises build a dynamic competence and sustainable competitive advantage. This paper posits that this dynamic competence or strategic flexibility as referred to by strategic management scholars is a phenomenon that needs to be understood by scholars and practitioners in MSEs so that effective intervention programs can be designed. The paper argues that by treating strategic flexibility as a CAS provides a methodology within which models based on known theories in strategic management are employed and tested using system dynamics. The paper also posits that System Dynamics (SD) modeling is a good modeling methodology that captures the dynamism in a CAS. The paper therefore presents a conceptual model for strategic flexibility and a system dynamic model that reveals the variables in play and their relationships. In so doing the paper exposes influence points in the CAS that act as intervention points by practitioners in strategic flexibility of firms. The paper presents ICTs as interventions at the influence points and presents a generic strategic flexibility system dynamic model that brings to play the impact of ICT.

Modeling and Simulation of Enterprise Alliance Running Status Based on System Dynamics

2011 ◽  
Vol 55-57 ◽  
pp. 898-903
Author(s):  
Xian Zhang
Keyword(s):  
Qualitative Analysis ◽  
System Dynamics ◽  
Modeling And Simulation ◽  
Dynamic Model ◽  
Dynamic Theory ◽  
Core Competencies ◽  
System Dynamic ◽  
System Dynamic Model ◽  
Key Factors

In this paper the key factors of the enterprise alliance running status were studied based on system dynamic theory. These factors include intrinsic restraint, achievement, core competencies and compatibility. A causality diagram and a system dynamic model which can reflect the growing process of enterprise alliance running phase were established. A program simulating the system dynamic model of the enterprise alliance running phase is also achieved, and the validation was infered by a qualitative analysis. The results show that it is a workable method to study the enterprise alliance running status with system dynamic theory．

scholarly journals CASE STUDY: DESIGN VALUE MEASURING BY SYSTEM DYNAMICS

2021 ◽  
Vol 24 (3) ◽  
pp. 79-92
Author(s):  
Eva Šviráková ◽  
Jan Kramoliš
Keyword(s):  
System Dynamics ◽  
Dynamic Model ◽  
Quantitative Evaluation ◽  
Qualitative Data ◽  
System Dynamic ◽  
Strategic Decision ◽  
External Parameter ◽  
System Dynamic Model ◽  
Design Value ◽  
Definition Of

The aim of the article is to show a way to measure the economic value of design using system dynamic modeling of key processes in an organization. The article fully accepts the complexity of the concept of design and opens up the possibility for employing system dynamics in design value measuring. The definition of design is given as an integral concept for which it is difficult to find a benchmark. The sequential explanatory method was chosen to solve the research problem. Qualitative data is collected first and it is recorded and examined. After that the data is transformed into numeric values and taken for quantitative evaluation in a system dynamic model. The connection of qualitative research data in a tool for quantitative evaluation allows an original interpretation of relationships that have been obtained and are collected only as qualitative data. Qualitative data collection is based on the visualization of a new definition of design: Design is an integration of functional, distribution, emotional and social experience of the customer. The questionnaire is in the form of Design Value Canvas and is used to determine the initial Design Value Algorithm (DVA) coefficient. As an external parameter, the DVA coefficient influences the development of the number of customers and their willingness to order the company’s products in the system dynamic model. The main result is the finding that an investment in design, which is confronted with customer preferences, fundamentally changes the economic parameters of business. Economic benefits of a design change in a company are always influenced by a strategic decision made by the entrepreneur who has to know the behaviour of their customers and to correctly choose the field of design in which it pays to invest.

ICT Powered Strategic Flexibility System Dynamic Model

2016 ◽  
pp. 967-987
Author(s):  
Agnes Mindila ◽  
Anthony Rodrigues ◽  
Dorothy McCormick ◽  
Ronald Mwangi
Keyword(s):  
System Dynamics ◽  
Strategic Management ◽  
Dynamic Model ◽  
Dynamic Capabilities ◽  
System Dynamic ◽  
Strategic Flexibility ◽  
System Dynamic Model ◽  
Sustainable Competitive Advantage ◽  
Modeling Methodology ◽  
The Impact

Resource-Based View (RBV) of the firm in strategic management literature focuses on firm internal endowments in terms of resources, capabilities and dynamic capabilities for their development. By establishing a learning mechanism, where they are able to adapt and influence the environment, enterprises build a dynamic competence and sustainable competitive advantage. This paper posits that this dynamic competence or strategic flexibility as referred to by strategic management scholars is a phenomenon that needs to be understood by scholars and practitioners in MSEs so that effective intervention programs can be designed. The paper argues that by treating strategic flexibility as a CAS provides a methodology within which models based on known theories in strategic management are employed and tested using system dynamics. The paper also posits that System Dynamics (SD) modeling is a good modeling methodology that captures the dynamism in a CAS. The paper therefore presents a conceptual model for strategic flexibility and a system dynamic model that reveals the variables in play and their relationships. In so doing the paper exposes influence points in the CAS that act as intervention points by practitioners in strategic flexibility of firms. The paper presents ICTs as interventions at the influence points and presents a generic strategic flexibility system dynamic model that brings to play the impact of ICT.

scholarly journals System Dynamic Model for the Accumulation of Renewable Electricity using Power-to-Gas and Power-to-Liquid Concepts

2015 ◽  
Vol 16 (1) ◽  
pp. 54-68 ◽  
Author(s):  
Andra Blumberga ◽  
Lelde Timma ◽  
Dagnija Blumberga
Keyword(s):  
Renewable Energy ◽  
System Dynamics ◽  
Dynamic Model ◽  
System Dynamic ◽  
System Dynamic Model ◽  
Conceptual System ◽  
Renewable Energy Resources ◽  
Power To Gas ◽  
Internal And External Factors

Abstract When the renewable energy is used, the challenge is match the supply of intermittent energy with the demand for energy therefore the energy storage solutions should be used. This paper is dedicated to hydrogen accumulation from wind sources. The case study investigates the conceptual system that uses intermitted renewable energy resources to produce hydrogen (power-to-gas concept) and fuel (power-to-liquid concept). For this specific case study hydrogen is produced from surplus electricity generated by wind power plant trough electrolysis process and fuel is obtained by upgrading biogas to biomethane using hydrogen. System dynamic model is created for this conceptual system. The developed system dynamics model has been used to simulate 2 different scenarios. The results show that in both scenarios the point at which the all electricity needs of Latvia are covered is obtained. Moreover, the methodology of system dynamics used in this paper is white-box model that allows to apply the developed model to other case studies and/or to modify model based on the newest data. The developed model can be used for both scientific research and policy makers to better understand the dynamic relation within the system and the response of system to changes in both internal and external factors.

Toward a circular economy: A system dynamic model of recycling framework for aseptic paper packaging waste in Indonesia

2021 ◽  
Vol 301 ◽  
pp. 126901
Author(s):  
Tsai-Chi Kuo ◽  
Ni-Ying Hsu ◽  
Reza Wattimena ◽  
I-Hsuan Hong ◽  
Chin-Jung Chao ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Circular Economy ◽  
System Dynamic ◽  
System Dynamic Model ◽  
Packaging Waste

Aero-engine dynamic model based on an improved compact propulsion system dynamic model

2021 ◽  
pp. 095965182098408
Author(s):  
Qiangang Zheng ◽  
Yong Wang ◽  
Chongwen Jin ◽  
Haibo Zhang
Keyword(s):  
Dynamic Model ◽  
Propulsion System ◽  
System Dynamic ◽  
Inlet Temperature ◽  
System Dynamic Model ◽  
Component Level ◽  
Engine Model ◽  
Surge Margin ◽  
Aero Engine ◽  
Engine Dynamic

The modern advanced aero-engine control methods are onboard dynamic model–based algorithms. In this article, a novel aero-engine dynamic modeling method based on improved compact propulsion system dynamic model is proposed. The aero-engine model is divided into inlet, core engine, surge margin and nozzle models for establishing sub-model in the compact propulsion system dynamic model. The model of core engine is state variable model. The models of inlet, surge margin and nozzle are nonlinear models which are similar to the component level model. A new scheduling scheme for basepoint control vector, basepoint state vector and basepoint output vector which considers the change of engine total inlet temperature is proposed to improve engine model accuracy especially the steady. The online feedback correction of measurable parameters is adopted to improve the steady and dynamic accuracy of model. The modeling errors of improved compact propulsion system dynamic model remain unchanged when engine total inlet temperature of different conditions are the same or changes small. The model accuracy of compact propulsion system dynamic model, especially the measurable parameters, is improved by online feedback correction. Moreover, the real-time performance of compact propulsion system dynamic model and improved compact propulsion system dynamic model are much better than component level model.

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