Systems

20 pages, 3216 KiB

Open AccessArticle

The Model-Driven Decision Arena: Augmented Decision-Making for Product-Service Systems Design

by Johan Wall, Marco Bertoni and Tobias Larsson

Systems 2020, 8(2), 22; https://doi.org/10.3390/systems8020022 - 18 Jun 2020

Cited by 15 | Viewed by 6031

The shift towards Product-Service Systems (PSS) stresses the need to embed new and unique capabilities in Decision Support Systems, with the aim of helping the engineering team in handling the pool of information and knowledge available during decision events. Emerging from a multiple [...] Read more.

The shift towards Product-Service Systems (PSS) stresses the need to embed new and unique capabilities in Decision Support Systems, with the aim of helping the engineering team in handling the pool of information and knowledge available during decision events. Emerging from a multiple case study in the Swedish manufacturing industry, this paper describes the development of the Model-Driven Decision Arena (MDDA), an environment for collaborative decision-making that focuses on the early design phases of PSS. Based on the findings from multiple case studies, this paper illustrates the main goals of the MDDA, detailing its main functions, its physical environment, and its software architecture and models. This paper demonstrates the use of the MDDA in a case study related to the development of an asphalt compactor, presenting and discussing the results of verification activities conducted with industrial practitioners on the current MDDA prototype. Full article

(This article belongs to the Special Issue Model-Based Systems Engineering and Product Service Systems Design)

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18 pages, 9064 KiB

Open AccessArticle

Effectiveness of the Early Response to COVID-19: Data Analysis and Modelling

by Edoardo Bertone, Martin Jason Luna Juncal, Rafaela Keiko Prado Umeno, Douglas Alves Peixoto, Khoi Nguyen and Oz Sahin

Systems 2020, 8(2), 21; https://doi.org/10.3390/systems8020021 - 18 Jun 2020

Cited by 8 | Viewed by 5240

Abstract

Governments around the world have introduced a number of stringent policies to try to contain COVID-19 outbreaks, but the relative importance of such measures, in comparison to the community response to these restrictions, the amount of testing conducted, and the interconnections between them, [...] Read more.

Governments around the world have introduced a number of stringent policies to try to contain COVID-19 outbreaks, but the relative importance of such measures, in comparison to the community response to these restrictions, the amount of testing conducted, and the interconnections between them, is not well understood yet. In this study, data were collected from numerous online sources, pre-processed and analysed, and a number of Bayesian Network models were developed, in an attempt to unpack such complexity. Results show that early, high-volume testing was the most crucial factor in successfully monitoring and controlling the outbreaks; when testing was low, early government and community responses were found to be both critical in predicting how rapidly cases and deaths grew in the first weeks of the outbreak. Results also highlight that in countries with low early test numbers, the undiagnosed cases could have been up to five times higher than the officially diagnosed cases. The conducted analysis and developed models can be refined in the future with more data and variables, to understand/model potential second waves of contagions. Full article

(This article belongs to the Special Issue Life in the Time of a Pandemic: Social, Economic, Health and Environmental Impacts of COVID-19—Systems Approach Study)

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10 pages, 1139 KiB

Open AccessCommunication

Developing a Preliminary Causal Loop Diagram for Understanding the Wicked Complexity of the COVID-19 Pandemic

by Oz Sahin, Hengky Salim, Emiliya Suprun, Russell Richards, Stefen MacAskill, Simone Heilgeist, Shannon Rutherford, Rodney A. Stewart and Cara D. Beal

Systems 2020, 8(2), 20; https://doi.org/10.3390/systems8020020 - 18 Jun 2020

Cited by 87 | Viewed by 53843

Abstract

COVID-19 is a wicked problem for policy makers internationally as the complexity of the pandemic transcends health, environment, social and economic boundaries. Many countries are focusing on two key responses, namely virus containment and financial measures, but fail to recognise other aspects. The [...] Read more.

COVID-19 is a wicked problem for policy makers internationally as the complexity of the pandemic transcends health, environment, social and economic boundaries. Many countries are focusing on two key responses, namely virus containment and financial measures, but fail to recognise other aspects. The systems approach, however, enables policy makers to design the most effective strategies and reduce the unintended consequences. To achieve fundamental change, it is imperative to firstly identify the “right” interventions (leverage points) and implement additional measures to reduce negative consequences. To do so, a preliminary causal loop diagram of the COVID-19 pandemic was designed to explore its influence on socio-economic systems. In order to transcend the “wait and see” approach, and create an adaptive and resilient system, governments need to consider “deep” leverage points that can be realistically maintained over the long-term and cause a fundamental change, rather than focusing on “shallow” leverage points that are relatively easy to implement but do not result in significant systemic change. Full article

(This article belongs to the Special Issue Life in the Time of a Pandemic: Social, Economic, Health and Environmental Impacts of COVID-19—Systems Approach Study)

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21 pages, 5227 KiB

Open AccessArticle

A Complex Systems Analysis of the Water-Energy Nexus in Malaysia

by Andrew Huey Ping Tan, Eng Hwa Yap and Yousif Abdalla Abakr

Systems 2020, 8(2), 19; https://doi.org/10.3390/systems8020019 - 15 Jun 2020

Cited by 6 | Viewed by 4782

Abstract

Water security plays a crucial role in maintaining livelihoods, especially emerging economies. In Malaysia, understanding the inter-relationships of water within the water-energy-food (WEF) nexus is at its infancy. This paper investigates the interactions of the water sector with energy sector in Malaysia, through [...] Read more.

Water security plays a crucial role in maintaining livelihoods, especially emerging economies. In Malaysia, understanding the inter-relationships of water within the water-energy-food (WEF) nexus is at its infancy. This paper investigates the interactions of the water sector with energy sector in Malaysia, through the lenses of WEF nexus, using system dynamics. The first part of the research involves qualitative interviews with key stakeholders in the water sectors, which provides validation for the initial causal loop relationships built and qualitative inputs of the water-energy nexus through the lenses of the water sector. The second part of the research is a quantitative simulation of stock and flow based on four carefully designed scenarios revolving around Malaysian water security. Key findings include an apparent disconnect between the states and federal governments in managing water supply, poor economic sustainability of the water supply and services industry, and significant energy use in the water sector. On the other hand, environmental impacts stemming from the water sector is minimal. Streamlining water governance and revising water tariffs have thus been suggested as policy recommendations, where their implementation could propagate into downstream benefits for the energy sector. Full article

(This article belongs to the Special Issue System Dynamics: Examples of Good Practice in Modelling and Simulation)

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17 pages, 1957 KiB

Open AccessArticle

Dynamic Response Systems of Healthcare Mask Production to COVID-19: A Case Study of Korea

by EunSu Lee, Yi-Yu Chen, Melanie McDonald and Erin O’Neill

Systems 2020, 8(2), 18; https://doi.org/10.3390/systems8020018 - 29 May 2020

Cited by 29 | Viewed by 10920

Abstract

Korea initiated a new experiment, called a dynamic response system for open democratic societies as a principle to respond to the novel coronavirus (COVID-19). The global pandemic of COVID-19 led to a surge in demand for healthcare medical masks and respirators, and strained [...] Read more.

Korea initiated a new experiment, called a dynamic response system for open democratic societies as a principle to respond to the novel coronavirus (COVID-19). The global pandemic of COVID-19 led to a surge in demand for healthcare medical masks and respirators, and strained the global supply chain of mask production and distribution systems. This study provides a systemic view of critical personal protective equipment for both healthcare staff and the public to stop the spread of COVID-19. This study investigates the dynamic response system of healthcare mask production to the coronavirus and discusses lessons learned in view of systems thinking. The study shows that it is critical to developing a quick and dynamic response system to the evolving market conditions with flexible and agile operations. Visibility with transparency with information sharing with the public is also critical under global pandemic. Due to the shortage of mask supply, smart consumption is required along with collaboration with public and private sectors, as well as global organizations. Democratic leadership and a well-prepared strategic plan for long-term period are essential to the open society to prepare the global pandemic in the future. This study serves as a benchmark for dynamic and timely responses to the global pandemic. Full article

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12 pages, 1614 KiB

Open AccessArticle

Discrete Competitive Lotka–Volterra Model with Controllable Phase Volume

by Anzhelika Voroshilova and Jeff Wafubwa

Systems 2020, 8(2), 17; https://doi.org/10.3390/systems8020017 - 27 May 2020

Cited by 9 | Viewed by 5977

Abstract

The simulation of population dynamics and social processes is of great interest in nonlinear systems. Recently, many scholars have paid attention to the possible applications of population dynamics models, such as the competitive Lotka–Volterra equation, in economic, demographic and social sciences. It was [...] Read more.

The simulation of population dynamics and social processes is of great interest in nonlinear systems. Recently, many scholars have paid attention to the possible applications of population dynamics models, such as the competitive Lotka–Volterra equation, in economic, demographic and social sciences. It was found that these models can describe some complex behavioral phenomena such as marital behavior, the stable marriage problem and other demographic processes, possessing chaotic dynamics under certain conditions. However, the introduction of external factors directly into the continuous system can influence its dynamic properties and requires a reformulation of the whole model. Nowadays most of the simulations are performed on digital computers. Thus, it is possible to use special numerical techniques and discrete effects to introduce additional features to the digital models of continuous systems. In this paper we propose a discrete model with controllable phase-space volume based on the competitive Lotka–Volterra equations. This model is obtained through the application of semi-implicit numerical methods with controllable symmetry to the continuous competitive Lotka–Volterra model. The proposed model provides almost linear control of the phase-space volume and, consequently, the quantitative characteristics of simulated behavior, by shifting the symmetry of the underlying finite-difference scheme. We explicitly show the possibility of introducing almost arbitrary law to control the phase-space volume and entropy of the system. The proposed approach is verified through bifurcation, time domain and phase-space volume analysis. Several possible applications of the developed model to the social and demographic problems’ simulation are discussed. The developed discrete model can be broadly used in modern behavioral, demographic and social studies. Full article

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20 pages, 7428 KiB

Open AccessArticle

Multiproduct Economic Lot Scheduling Problem with Returns and Sorting Line

by Ivan Ferretti

Systems 2020, 8(2), 16; https://doi.org/10.3390/systems8020016 - 26 May 2020

Cited by 3 | Viewed by 3714

Abstract

This work studies a hybrid manufacturing–remanufacturing system with a sorting line and disposal. In particular, it models a company that collects used product, remanufactures returned products that have been evaluated as suitable to be recovered, and manufactures new products to satisfy customer demand. [...] Read more.

This work studies a hybrid manufacturing–remanufacturing system with a sorting line and disposal. In particular, it models a company that collects used product, remanufactures returned products that have been evaluated as suitable to be recovered, and manufactures new products to satisfy customer demand. Specifically, the system is modeled as a multilevel inventory system, with three types of stock (used products inventory, recoverable inventory, and serviceable inventory), each characterized by an inventory holding cost, and three limited capacity resources: a sorting line, which enables the company to distinguish those returns that are remanufacturable from those that are not; a remanufacturing line to carry out operations on sorted remanufacturable returns; and a manufacturing line to produce new products in order to satisfy customer demand. Each resource is characterized by a setup cost, as well as a constant production rate, while each type of stock is associated with an inventory holding cost. The aim of the paper is to develop a model for the considered production system in order to minimize the setup and inventory holding costs. In particular, the objective is to evaluate the behavior of a controllable disposal rate with the minimization of the total cost function, by considering the effect on the remanufacturing and manufacturing lines. Full article

(This article belongs to the Special Issue Industry 4.0 and Energy-Efficient Production Planning)

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12 pages, 2323 KiB

Open AccessArticle

Non-Standard Analysis for Regularization of Geometric-Zeno Behaviour in Hybrid Systems

by Ayman Aljarbouh, Muhammad Fayaz and Muhammad Shuaib Qureshi

Systems 2020, 8(2), 15; https://doi.org/10.3390/systems8020015 - 21 May 2020

Cited by 1 | Viewed by 3619

Abstract

Geometric-Zeno behaviour is a highly challenging problem in the analysis (including simulation) of hybrid systems. Geometric-Zeno can be defined as an infinite number of discrete mode switches in a finite time interval. Typically, for hybrid models exhibiting geometric-Zeno, the numerical simulation either halts [...] Read more.

Geometric-Zeno behaviour is a highly challenging problem in the analysis (including simulation) of hybrid systems. Geometric-Zeno can be defined as an infinite number of discrete mode switches in a finite time interval. Typically, for hybrid models exhibiting geometric-Zeno, the numerical simulation either halts or produces false results, because an infinite number of discrete events occur in a given simulation time-step. In this paper, we provide formal methods for regularization of geometric-Zeno behaviour by using a non-standard analysis. In particular, we provide formal conditions for the existence of geometric-Zeno in hybrid systems, and we propose methods to allow geometric-Zeno executions to be continued beyond geometric-Zeno limit points. The concepts are illustrated with a case study throughout the paper. Full article

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19 pages, 2824 KiB

Open AccessCommunication

Practical Applications of Systems Thinking to Business

by Jamie Monat, Matthew Amissah and Thomas Gannon

Systems 2020, 8(2), 14; https://doi.org/10.3390/systems8020014 - 2 May 2020

Cited by 18 | Viewed by 22606

Abstract

In this paper we summarize the research on Systems Thinking for business management and explore several examples of business failures due to a lack of application of Systems Thinking, with an ultimate goal of offering a Systems Thinking approach that is useful to [...] Read more.

In this paper we summarize the research on Systems Thinking for business management and explore several examples of business failures due to a lack of application of Systems Thinking, with an ultimate goal of offering a Systems Thinking approach that is useful to all levels of management. Although there is significant literature aimed at facilitating Systems Thinking in organizational management, there remains a lack of adoption of Systems Thinking in mainstream business practice. This is perhaps because the literature does not reduce high-level Systems Thinking principles to hands-on, practical protocols that are accessible for typical managers, thus limiting the working application of Systems Thinking concepts to researchers and consultants who specialize in the field. The goal of this work is to not only elaborate on the high-level ideals of System Thinking, but also to articulate a more precise and practical hands-on approach that is useful to all levels of business managers. Full article

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24 pages, 2523 KiB

Open AccessArticle

Designating Regional Elements System in a Critical Infrastructure System in the Context of the Czech Republic

by Petr Novotny and Michaela Janosikova

Systems 2020, 8(2), 13; https://doi.org/10.3390/systems8020013 - 22 Apr 2020

Cited by 9 | Viewed by 4349

Abstract

Critical infrastructure is a complex system whose disruption or failure results in significant impacts on state interests, i.e., territorial security, economy, and the basic needs of the population. The current European Critical Infrastructure Protection Model does not allow the direct identification of critical [...] Read more.

Critical infrastructure is a complex system whose disruption or failure results in significant impacts on state interests, i.e., territorial security, economy, and the basic needs of the population. The current European Critical Infrastructure Protection Model does not allow the direct identification of critical elements at the regional level. Based on this, the paper brings a proposal for a unified system of critical infrastructure design based on a bottom-up approach. It is a progressive approach, utilizing contemporary trends in the application of science-based knowledge to critical infrastructure. A holistic view of this issue allows us to take into account the needs and preferences of the population, the preferences of the stakeholders and the local conditions of the region under consideration. The novelty of this approach is seen, in particular, in the identification of regional critical infrastructure elements through an integral assessment of these elements’ failure impact, not only on the dependent subsectors, but also on the population (population equivalent) in the assessed region. The final part of the paper presents a case study demonstrating the practical application of the proposed system to the road infrastructure in the Pardubice Region of the Czech Republic. Full article

(This article belongs to the Collection Systems Engineering)

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19 pages, 1921 KiB

Open AccessReview

A New Multiteam System (MTS) Effectiveness Model

by John Turner, Rose Baker, Zain Ali and Nigel Thurlow

Systems 2020, 8(2), 12; https://doi.org/10.3390/systems8020012 - 19 Apr 2020

Cited by 15 | Viewed by 10498

Abstract

Team effectiveness models in the literature are primarily concentrated on traditional teams, with few involving the multiteam system (MTS) level of analysis in the model. Teams achieve their goals by managing both teamwork (e.g., interpersonal, effective, motivational, cognitive) and taskwork (e.g., strategy, goal [...] Read more.

Team effectiveness models in the literature are primarily concentrated on traditional teams, with few involving the multiteam system (MTS) level of analysis in the model. Teams achieve their goals by managing both teamwork (e.g., interpersonal, effective, motivational, cognitive) and taskwork (e.g., strategy, goal setting, project management) activities. When MTSs are involved, multiple teams manage their own teamwork and taskwork activities, while leadership must be in place to coordinate these activities within and between teams in order to achieve the organization’s goal (the MTS’s goal). This research study conducted a systematic review of current team effectiveness frameworks and models. A narrative-based method for theorizing was utilized to develop a new MTS team effectiveness framework. This research contributes to the MTS literature by providing a new formula for team effectiveness at both the team level (team effectiveness formula) and the MTS level (MTS team effectiveness formula). This research aids managers, practitioners, and researchers by providing a tool that accounts for all levels and temporal processes. Full article

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36 pages, 2442 KiB

Open AccessArticle

A Method for Measuring Systems Thinking Learning

by Seth Taylor, Javier Calvo-Amodio and Jay Well

Systems 2020, 8(2), 11; https://doi.org/10.3390/systems8020011 - 17 Apr 2020

Cited by 18 | Viewed by 7409

Abstract

The myriad of problems facing the world today are increasingly complex, dynamic, and transcend multiple domains. This necessitates the need for trans-disciplinary approaches capable of providing a framework to help solve these problems. Systems thinking provides the skills necessary for people to approach [...] Read more.

The myriad of problems facing the world today are increasingly complex, dynamic, and transcend multiple domains. This necessitates the need for trans-disciplinary approaches capable of providing a framework to help solve these problems. Systems thinking provides the skills necessary for people to approach these types of problems. However, a lack of awareness and understanding of systems thinking hinders a potential systems-literate and systems-capable society. Systems thinking is comprised of four underlying concepts or skills: distinction-making, organizing systems, inter-relating, and perspective-taking. The path to becoming a systems thinker follows a process comprised of three levels—sensibility (awareness of systems), literacy (knowledge of systems), and capability (understanding of systems)—repeated across multiple learning phases. During this research study, a method was defined to measure whether non-experts learned the underlying systems thinking concepts according to this learning process. An experiment was conducted with 97 middle and high school students who were asked to draw a fish-tank system before and after being taught to apply the systems thinking concepts as skills for identifying elements, interactions, and roles/purposes. The results provide evidence to conclude that student learning of systems thinking significantly increased from the first drawing to the second drawing. Full article

(This article belongs to the Special Issue Advances in the Systems Sciences 2018)

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15 pages, 1529 KiB

Open AccessArticle

Applying Control Abstraction to the Design of Human–Agent Teams

by Clifford D. Johnson, Michael E. Miller, Christina F. Rusnock and David R. Jacques

Systems 2020, 8(2), 10; https://doi.org/10.3390/systems8020010 - 12 Apr 2020

Cited by 6 | Viewed by 4502

Abstract

Levels of Automation (LOA) provide a method for describing authority granted to automated system elements to make individual decisions. However, these levels are technology-centric and provide little insight into overall system operation. The current research discusses an alternate classification scheme, referred to as [...] Read more.

Levels of Automation (LOA) provide a method for describing authority granted to automated system elements to make individual decisions. However, these levels are technology-centric and provide little insight into overall system operation. The current research discusses an alternate classification scheme, referred to as the Level of Human Control Abstraction (LHCA). LHCA is an operator-centric framework that classifies a system’s state based on the required operator inputs. The framework consists of five levels, each requiring less granularity of human control: Direct, Augmented, Parametric, Goal-Oriented, and Mission-Capable. An analysis was conducted of several existing systems. This analysis illustrates the presence of each of these levels of control, and many existing systems support system states which facilitate multiple LHCAs. It is suggested that as the granularity of human control is reduced, the level of required human attention and required cognitive resources decreases. Thus, it is suggested that designing systems that permit the user to select among LHCAs during system control may facilitate human-machine teaming and improve the flexibility of the system. Full article

(This article belongs to the Special Issue Human Factors in Systems Engineering)

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Systems, Volume 8, Issue 2 (June 2020) – 13 articles

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