Monday, 11 April 2022

A Digital Twin Earth that could be used to understand and combat Climate Change highly effectively...

 

Such an idea as indicated in the above has implications and relevance to the emerging paradigm of Transfinancial Economics   RS


A Digital Twin Earth....Video


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Destination Earth (European Union)

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Destination Earth also known as DestinE, is an initiative from the European Commission of Ursula Von der Leyen. It aims to create a digital simulation of Earth with a digital twin that will be used to better understand the effects of climate change and environmental disasters and to permit policymakers more effectively respond to these issues.

Background[edit]

The project Destination Earth embodies the wider scope of the Von der Leyen’s Commission. The project inscribes itself in the two-key priorities of the Commission which are the digital transition and climate transition, aiming together to achieve carbon neutrality by 2050.:[1]. Integrated to the Digital Europe Programme[2] and the European Green Deal,[3] Destination Earth projects to create a digital simulation of Earth with a digital twin of our planet meaning an exact digital reproduction of the Earth.[4] It will use an unprecedented amount of real-time data from climate, meteorological, behavioral, atmospheric sensors to develop this high-precision model of our planet. [3]

Relevance of the project[edit]

This very precise digital model of the Earth would enable different user groups such as public groups and the scientific and private communities to monitor and simulate natural and human activity, and to develop test scenarios in order to better predict the effects of climate change . With the current climate change challenge, this initiative is very relevant. Using DestinE modeling, the European Commission, as part of the European Green Deal, but also states will be able to evaluate the impact and efficiency of environmental legislative proposals.[4]

Chronology[edit]

  • November 2019: the first stakeholder workshop on DestinE was held.[5] It brings together a variety of potentially interested parties from the public authorities and the industrial and scientific communities.
  • October 2020: in consultation with institutions such as the European Space Agency, the European Centre for Medium-Range Weather Forecasts, the European Organisation for the Exploitation of Meteorological Satellites and the services and agencies of the European Commission, The Joint Research Centre released its study entitled “Destination Earth - Use Case Analysis”.[6] It gives a state-of-the-art requirements analysis for the development and creation of digital twins . It also gives the technical architecture necessary and the first mapping of already existing developments in Europe in the field of digital twins.
  • January 2021: Destin Earth has been officially launched.

Implementation[edit]

DestinE has been launched on 1st January 2021 and will be gradually implemented over the next 7 to 10 following years . The operational platform of the modeling “digital twins and services” will be developed by the European Commission under the Digital Europe program. Financially, it is Horizon Europe, the European Union's research and innovation “framework program” that has taken effect on 1st January 2021, that is founding the research and innovation for the further development of DestinE. DestinE may also associate with other EU programs such as the new Space Programme which will support the European space industry.[7] Other possible synergies with national initiatives will be explored.

Key steps of DestinE[edit]

In more details, Destin Earth is expected to follow three scheduled stages [8]

  • By 2023: the operational platform is expected to be launched . It will be the first two digital twins.The EU is likely to succeed in this objective. As Josef Aschbacher – next director of the European Space Agency from March 1st, 2021 – told Bloomberg on January 17, 2021, the Destination Earth initiative will indeed be able to produce its first digital-twin models before the end of the decade [9]
  • By 2025: the platform will integrate 4 to 5 operational digital twins. At that date, the platform is expected to be open to the public sector in order for them to be able to develop, monitor, and assess the impact on the environment and climate of policy and legislative measures.
  • By 2025-30: Development towards a full digital twin of the Earth through a convergence of the digital twins already offered through the platform.

References[edit]

  1. ^ Stephano Nativi, Max Craglia (2020). JRC Technical Report: Destination Earth Use Cases Analysis, European Commission.
  2. ^ Cécile Huet. Where Copernicus meets AI… in EU funding programmes. https://www.copernicus.eu/sites/default/files/2020-02/Cécile%20Huet.pdf
  3. ^ Jump up to:a b Jacob Dykes. (2021). The EU announces plans to build Destination Earth, a digital twin of our planet. https://geographical.co.uk/nature/climate/item/3940-the-eu-announces-plans-to-build-destintation-earth-a-digital-twin-of-our-planet
  4. ^ Jump up to:a b European Commission. (2020). Remote Workshops on the Destination Earth Initiative – Elements of a Digital Twin on Weather-induced and Geophysical Extremes and on Climate Change Adaptation Summary Report.
  5. ^ European Commission. (2020). Destination Earth (DestinE) Architecture Validation Workshop 26th of November 2020 Summary Report
  6. ^ Stephano Nativi, and Max Craglia (2020). JRC Technical Report: Destination Earth Use Cases Analysis, European Commission.
  7. ^ Commission welcomes the political agreement on the European Space Programme. European Commission, Press release, Brussels, 16 December 2020.
  8. ^ European Commission. 21/22 Oct 2020 Remote Workshops on the Destination Earth Initiative – Elements of a Digital Twin on Weather-induced and Geophysical Extremes and on Climate Change Adaptation Summary Report.
  9. ^ Tirone Jonathan. Europe’s Satellites Could Help Catch the Next Climate Disaster. Bloomberg. January 17, 2021. https://www.bloomberg.com/news/articles/2021-01-17/the-european-space-agency-s-satellites-could-predict-the-next-climate-disaster



              Apart from Climate Change the data below also has relevance for Transfinancial Economics




Digital twin

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A digital twin is a virtual representation that serves as the real-time digital counterpart of a physical object or process. Though the concept originated earlier (attributed to Michael Grieves, then of the University of Michigan, in 2002) the first practical definition of digital twin originated from NASA in an attempt to improve physical model simulation of spacecraft in 2010.[1] Digital twins are the result of continual improvement in the creation of product design and engineering activities. Product drawings and engineering specifications progressed from handmade drafting to computer aided drafting/computer aided design to model-based systems engineering.

The digital twin of a physical object is dependent on the digital thread—the lowest level design and specification for a digital twin—and the "twin" is dependent on the digital thread to maintain accuracy. Changes to product design are implemented using engineering change orders (ECO). An ECO made to a component item will result in a new version of the item's digital thread, and correspondingly to the digital twin.

Origin and types of digital twins[edit]

Digital twins were anticipated by David Gelernter's 1991 book Mirror Worlds.[2][3] Michael Grieves of Florida Institute of Technology first applied the digital twin concept in manufacturing.[4][5][6][7][8][9] The concept and model of the digital twin was publicly introduced in 2002 by Grieves, then of the University of Michigan, at a Society of Manufacturing Engineers conference in Troy, Michigan.[10] Grieves proposed the digital twin as the conceptual model underlying product lifecycle management (PLM).

An Early Digital Twin Concept by Grieves and Vickers

The concept, which had a few different names, was subsequently called the "digital twin" by John Vickers of NASA in a 2010 Roadmap Report.[11] The digital twin concept consists of three distinct parts: the physical product, the digital/virtual product, and connections between the two products. The connections between the physical product and the digital/virtual product is data that flows from the physical product to the digital/virtual product and information that is available from the digital/virtual product to the physical environment.

The concept was divided into types later.[12] The types are the digital twin prototype (DTP), the digital twin instance (DTI), and the digital twin aggregate (DTA). The DTP consists of the designs, analyses, and processes to realize a physical product. The DTP exists before there is a physical product. The DTI is the digital twin of each individual instance of the product once it is manufactured. The DTA is the aggregation of DTIs whose data and information can be used for interrogation about the physical product, prognostics, and learning. The specific information contained in the digital twins is driven by use cases. The digital twin is a logical construct, meaning that the actual data and information may be contained in other applications.

In addition, the Digital Twin can be divided into three subcategories according to the different integration level, namely the different degree of data and information flow that may occur between the physical part and the digital copy: Digital Model (DM), Digital Shadow (DS) and Digital Twin.

A digital twin in the workplace is often considered part of robotic process automation (RPA) and, per industry-analyst firm Gartner, is part of the broader and emerging "hyperautomation" category.[citation needed]

Examples[edit]

An example of digital twins is the use of 3D modeling to create digital companions for the physical objects.[13][14][15][6][7] It can be used to view the status of the actual physical object, which provides a way to project physical objects into the digital world.[16] For example, when sensors collect data from a connected device, the sensor data can be used to update a "digital twin" copy of the device's state in real time.[17][18][19] The term "device shadow" is also used for the concept of a digital twin.[20] The digital twin is meant to be an up-to-date and accurate copy of the physical object's properties and states, including shape, position, gesture, status and motion.[21]

A digital twin also can be used for monitoring, diagnostics and prognostics to optimize asset performance and utilization. In this field, sensory data can be combined with historical data, human expertise and fleet and simulation learning to improve the outcome of prognostics.[22] Therefore, complex prognostics and intelligent maintenance system platforms can use digital twins in finding the root cause of issues and improve productivity.[23]

Digital twins of autonomous vehicles and their sensor suite embedded in a traffic and environment simulation have also been proposed as a means to overcome the significant development, testing and validation challenges for the automotive application,[24] in particular when the related algorithms are based on artificial intelligence approaches that require extensive training data and validation data sets.

Manufacturing industry[edit]

The physical manufacturing objects are virtualized and represented as digital twin models (avatars) seamlessly and closely integrated in both the physical and cyber spaces.[25] Physical objects and twin models interact in a mutually beneficial manner.

Industry-level dynamics[edit]

The digital twin is disrupting the entire product lifecycle management (PLM), from design, to manufacturing to service and operations.[26] Nowadays, PLM is very time-consuming in terms of efficiency, manufacturing, intelligence, service phases and sustainability in product design. A digital twin can merge the product physical and virtual space.[27] The digital twin enables companies to have a digital footprint of all of their products, from design to development and throughout the entire product life cycle.[28][29] Broadly speaking, industries with manufacturing business are highly disrupted by digital twins. In the manufacturing process, the digital twin is like a virtual replica of the near-time occurrences in the factory. Thousands of sensors are being placed throughout the physical manufacturing process, all collecting data from different dimensions, such as environmental conditions, behavioural characteristics of the machine and work that is being performed. All this data is continuously communicating and collected by the digital twin.[28]

Due to the Internet of Things, digital twins have become more affordable and could drive the future of the manufacturing industry. A benefit for engineers lies in real-world usage of products that are virtually being designed by the digital twin. Advanced ways of product and asset maintenance and management come within reach as there is a digital twin of the real 'thing' with real-time capabilities.[30]

Digital twins offer a great amount of business potential by predicting the future instead of analyzing the past of the manufacturing process.[31] The representation of reality created by digital twins allows manufacturers to evolve towards ex-ante business practices.[26] The future of manufacturing drives on the following four aspects: modularity, autonomy, connectivity and digital twin.[32] As there is an increasing digitalization in the stages of a manufacturing process, opportunities are opening up to achieve a higher productivity. This starts with modularity and leading to higher effectiveness in the production system. Furthermore, autonomy enables the production system to respond to unexpected events in an efficient and intelligent way. Lastly, connectivity like the Internet of Things, makes the closing of the digitalization loop possible, by then allowing the following cycle of product design and promotion to be optimized for higher performance.[32] This may lead to increase in customer satisfaction and loyalty when products can determine a problem before actually breaking down.[26] Furthermore, as storage and computing costs are becoming less expensive, the ways in which digital twins are used are expanding.[28]

Urban planning and the construction (built environment) industry[edit]

Geographic digital twins have been popularised in urban planning practice, given the increasing appetite for digital technology in the Smart Cities movement. These digital twins are often proposed in the form of interactive platforms to capture and display real-time 3D and 4D spatial data in order to model urban environments (cities) and the data feeds within them.[33]

Visualization technologies such as augmented reality (AR) systems are being used as both collaborative tools for design and planning in the built environment integrating data feeds from embedded sensors in cities and API services to form digital twins. For example, AR can be used to create augmented reality maps, buildings, and data feeds projected onto tabletops for collaborative viewing by built environment professionals.[34]

In the built environment, partly through the adoption of building information modeling (BIM) processes, planning, design, construction, and operation and maintenance activities are increasingly being digitised, and digital twins of built assets are seen as a logical extension - at an individual asset level and at a national level. In the United Kingdom in November 2018, for example, the Centre for Digital Built Britain published The Gemini Principles,[35] outlining principles to guide development of a "national digital twin".[36]

One of the earliest examples of a working 'digital twin' was achieved in 1996 during construction of the Heathrow Express facilities at Heathrow Airport's Terminal 1. Consultant Mott MacDonald and BIM pioneer Jonathan Ingram connected movement sensors in the cofferdam and boreholes to the digital object-model to display movements in the model. A digital grouting object was made to monitor the effects of pumping grout into the earth to stabilise ground movements.[37]

Healthcare industry[edit]

Healthcare is recognized as an industry being disrupted by the digital twin technology.[38][27] The concept of digital twin in the healthcare industry was originally proposed and first used in product or equipment prognostics.[27] With a digital twin, lives can be improved in terms of medical health, sports and education by taking a more data-driven approach to healthcare.[26] The availability of technologies makes it possible to build personalized models for patients, continuously adjustable based on tracked health and lifestyle parameters. This can ultimately lead to a virtual patient, with detailed description of the healthy state of an individual patient and not only on previous records. Furthermore, the digital twin enables individual's records to be compared to the population in order to easier find patterns with great detail.[38] The biggest benefit of the digital twin on the healthcare industry is the fact that healthcare can be tailored to anticipate on the responses of individual patients. Digital twins will not only lead to better resolutions when defining the health of an individual patient but also change the expected image of a healthy patient. Previously, 'healthy' was seen as the absence of disease indications. Now, 'healthy' patients can be compared to the rest of the population in order to really define healthy.[38] However, the emergence of the digital twin in healthcare also brings some downsides. The digital twin may lead to inequality, as the technology might not be accessible for everyone by widening the gap between the rich and poor. Furthermore, the digital twin will identify patterns in a population which may lead to discrimination.[38][39]

Automotive industry[edit]

The automobile industry has been improved by digital twin technology. Digital twins in the automobile industry are implemented by using existing data in order to facilitate processes and reduce marginal costs. Currently, automobile designers expand the existing physical materiality by incorporating software-based digital abilities.[40] A specific example of digital twin technology in the automotive industry is where automotive engineers use digital twin technology in combination with the firm's analytical tool in order to analyze how a specific car is driven. In doing so, they can suggest incorporating new features in the car that can reduce car accidents on the road, which was previously not possible in such a short time frame.[41]

The characteristics of digital twin technology[edit]

Digital technologies have certain characteristics that distinguish them from other technologies. These characteristics, in turn, have certain consequences. Digital twins have the following characteristics.

Connectivity[edit]

One of the main characteristics of digital twin technology is its connectivity. The recent development of the Internet of Things (IoT) brings forward numerous new technologies. The development of IoT also brings forward the development of digital twin technology. This technology shows many characteristics that have similarities with the character of the IoT, namely its connective nature. First and foremost, the technology enables connectivity between the physical component and its digital counterpart. The basis of digital twins is based on this connection, without it, digital twin technology would not exist. As described in the previous section, this connectivity is created by sensors on the physical product which obtain data and integrate and communicate this data through various integration technologies. Digital twin technology enables increased connectivity between organizations, products, and customers.[29] For example, connectivity between partners in a supply chain can be increased by enabling members of this supply chain to check the digital twin of a product or asset. These partners can then check the status of this product by simply checking the digital twin.

Also, connectivity with customers can be increased.

Servitization is the process of organizations that are adding value to their core corporate offerings through services.[42] In the case of the example of engines, the manufacturing of the engine is the core offering of this organization, they then add value by providing a service of checking the engine and offering maintenance.

Homogenization[edit]

Digital twins can be further characterized as a digital technology that is both the consequence and an enabler of the homogenization of data. Due to the fact that any type of information or content can now be stored and transmitted in the same digital form, it can be used to create a virtual representation of the product (in the form of a digital twin), thus decoupling the information from its physical form.[43] Therefore, the homogenization of data and the decoupling of the information from its physical artifact, have allowed digital twins to come into existence. However, digital twins also enable increasingly more information on physical products to be stored digitally and become decoupled from the product itself.[40]

As data is increasingly digitized, it can be transmitted, stored and computed in fast and low-cost ways.[40] According to Moore's law, computing power will continue to increase exponentially over the coming years, while the cost of computing decreases significantly. This would, therefore, lead to lower marginal costs of developing digital twins and make it comparatively much cheaper to test, predict, and solve problems on virtual representations rather than testing on physical models and waiting for physical products to break before intervening.

Another consequence of the homogenization and decoupling of information is that the user experience converges. As information from physical objects is digitized, a single artifact can have multiple new affordances.[40] Digital twin technology allows detailed information about a physical object to be shared with a larger number of agents, unconstrained by physical location or time.[44] In his white paper on digital twin technology in the manufacturing industry, Michael Grieves noted the following about the consequences of homogenization enabled by digital twins:[45]

In the past, factory managers had their office overlooking the factory so that they could get a feel for what was happening on the factory floor. With the digital twin, not only the factory manager, but everyone associated with factory production could have that same virtual window to not only a single factory, but to all the factories across the globe. (Grieves, 2014, p. 5)

Reprogrammable and smart[edit]

As stated above, a digital twin enables a physical product to be reprogrammable in a certain way. Furthermore, the digital twin is also reprogrammable in an automatic manner. Through the sensors on the physical product, artificial intelligence technologies, and predictive analytics,[46] A consequence of this reprogrammable nature is the emergence of functionalities. If we take the example of an engine again, digital twins can be used to collect data about the performance of the engine and if needed adjust the engine, creating a newer version of the product. Also, servitization can be seen as a consequence of the reprogrammable nature as well. Manufactures can be responsible for observing the digital twin, making adjustments, or reprogramming the digital twin when needed and they can offer this as an extra service.

Digital traces[edit]

Another characteristic that can be observed, is the fact that digital twin technologies leave digital traces. These traces can be used by engineers for example, when a machine malfunctions to go back and check the traces of the digital twin, to diagnose where the problem occurred.[47] These diagnoses can in the future also be used by the manufacturer of these machines, to improve their designs so that these same malfunctions will occur less often in the future.

Modularity[edit]

In the sense of the manufacturing industry, modularity can be described as the design and customization of products and production modules.[32] By adding modularity to the manufacturing models, manufacturers gain the ability to tweak models and machines. Digital twin technology enables manufacturers to track the machines that are used and notice possible areas of improvement in the machines. When these machines are made modular, by using digital twin technology, manufacturers can see which components make the machine perform poorly and replace these with better fitting components to improve the manufacturing process.

Related technologies[edit]

External links[edit]

  • Digital Control Twin and Supply Chain [1]
  • IEEE - Digital Twin: Enabling Technologies, Challenges and Open Research [2]
  • ISO/DIS 23247-1 Automation systems and integration — Digital Twin framework for manufacturing — Part 1: Overview and general principles [3]

References[edit]

  1. ^ Elisa Negri (2017). "A review of the roles of Digital Twin in CPS-based production systems". Procedia Manufacturing. 11: 939–948.
  2. ^ Gelernter, David Hillel (1991). Mirror Worlds: or the Day Software Puts the Universe in a Shoebox—How It Will Happen and What It Will Mean. Oxford; New York: Oxford University Press. ISBN 978-0195079067. OCLC 23868481.
  3. ^ "Siemens and General Electric gear up for the internet of things". The Economist. 3 December 2016. That technology allows manufacturers to create what David Gelernter, a pioneering computer scientist at Yale University, over two decades ago imagined as 'mirror worlds'.
  4. ^ Marr, Bernard (March 6, 2017). "What Is Digital Twin Technology - And Why Is It So Important?". Forbes.com. Retrieved September 10, 2019.
  5. ^ Thilmany, Jean (September 21, 2017). "Identical Twins". ASME. Retrieved September 10, 2019.
  6. ^ Jump up to:a b "Digital twins – rise of the digital twin in Industrial IoT and Industry 4.0". i-SCOOP. Retrieved 2019-09-11.
  7. ^ Jump up to:a b Trancossi, Michele; Cannistraro, Mauro; Pascoa, Jose (2018-12-30). "Can constructal law and exergy analysis produce a robust design method that couples with industry 4.0 paradigms? The case of a container house". Mathematical Modelling of Engineering Problems. 5 (4): 303–312. doi:10.18280/mmep.050405. ISSN 2369-0739.
  8. ^ Xu, Yan; Sun, Yanming; Liu, Xiaolong; Zheng, Yonghua (2019). "A Digital-Twin-Assisted Fault Diagnosis Using Deep Transfer Learning". IEEE Access. 7: 19990–19999. doi:10.1109/ACCESS.2018.2890566. ISSN 2169-3536.
  9. ^ Greengard, Samuel. "Digital Twins Grow Up". cacm.acm.org. Retrieved 2019-09-11.
  10. ^ Grieves, M., Virtually Intelligent Product Systems: Digital and Physical Twins, in Complex Systems Engineering: Theory and Practice, S. Flumerfelt, et al., Editors. 2019, American Institute of Aeronautics and Astronautics. p. 175-200.
  11. ^ Piascik, R., et al., Technology Area 12: Materials, Structures, Mechanical Systems, and Manufacturing Road Map. 2010, NASA Office of Chief Technologist.
  12. ^ Grieves, M. and J. Vickers, Digital Twin: Mitigating Unpredictable, Undesirable Emergent Behavior in Complex Systems, in Trans-Disciplinary Perspectives on System Complexity, F.-J. Kahlen, S. Flumerfelt, and A. Alves, Editors. 2016, Springer: Switzerland. p. 85-114.
  13. ^ "Shaping the Future of the IoT". YouTube. PTC. Retrieved 22 September 2015.
  14. ^ "On Track For The Future – The Siemens Digital Twin Show". YouTube. Siemens. Retrieved 22 September 2015.
  15. ^ "'Digital twins' could make decisions for us within 5 years, John Smart says". news.com.au. Retrieved 22 September 2015.
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  17. ^ Marr, Bernard. "What Is Digital Twin Technology – And Why Is It So Important?". Forbes. Retrieved 7 March 2017.
  18. ^ Grieves, Michael. "Digital Twin: Manufacturing Excellence through Virtual Factory Replication" (PDF). Florida Institute of Technology. Retrieved 24 March 2017.
  19. ^ "GE Doubles Down On 'Digital Twins' For Business Knowledge". InformationWeek. Retrieved 26 July 2017.
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  22. ^ "GE Oil & Gas 2017 Annual Meeting: 'Digital: Exploring what's possible' with Colin Parris". Youtube. GE Oil & Gas. Retrieved 26 July 2017.
  23. ^ Vadym Slyusar. The concept of networked distributed engine control system of future air vehicles. // Proceedings of AVT-357 STO NATO Workshop on Technologies for future distributed engine control systems (DECS). - 11 -13 May, 2021. - 12 p. DOI: 10.14339/STO-MP-AVT-357
  24. ^ Hallerbach, Sven; Xia, Yiqun; Eberle, Ulrich; Koester, Frank (3 April 2018). "Simulation-based Identification of Critical Scenarios for Cooperative and Automated Vehicles". SAE Technical Paper 2018-01-1066. Retrieved 23 December 2018.
  25. ^ Yang, Chen; Shen, Weiming; Wang, Xianbin (2018). "The Internet of Things in Manufacturing: Key Issues and Potential Applications". IEEE Systems, Man, and Cybernetics Magazine. 4(1): 6–15. doi:10.1109/MSMC.2017.2702391. S2CID 42651835.
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  33. ^ NSW, Digital (25 February 2020). "NSW Digital win". Retrieved 25 February 2020.
  34. ^ Lock, Oliver. "HoloCity – exploring the use of augmented reality cityscapes for collaborative understanding of high-volume urban sensor data". VRCAI '19: The 17th International Conference on Virtual-Reality Continuum and its Applications in Industry. New York: Association for Computing Machinery. doi:10.1145/3359997.3365734. ISBN 978-1-4503-7002-8. S2CID 208033164.
  35. ^ "The Gemini Principles" (PDF). www.cdbb.cam.ac.uk. Centre for Digital Built Britain. 2018. Retrieved 2020-01-01.
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  37. ^ Ingram, Jonathan (2020). Understanding BIM: The Past Present and Future, Routledge. Case study: Heathrow Express, Mott MacDonald and Taylor Woodrow, pp.128-132.
  38. ^ Jump up to:a b c d Bruynseels, Koen; Santoni de Sio, Filippo; van den Hoven, Jeroen (February 2018). "Digital Twins in Health Care: Ethical Implications of an Emerging Engineering Paradigm". Frontiers in Genetics. 9: 31. doi:10.3389/fgene.2018.00031. PMC 5816748. PMID 29487613.
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  41. ^ Cearley, David W.; Burker, Brian; Searle, Samantha; Walker, Mike J. (3 October 2017). "The top 10 strategic technology trends for 2013" (PDF). Gartner Trends 2018: 1–24.
  42. ^ Vandermerwe, Sandra; Rada, Juan (Winter 1988). "Servitization of business: Adding value by adding services". European Management Journal. 6 (4): 314–324. doi:10.1016/0263-2373(88)90033-3.
  43. ^ Tilson, David; Lyytinen, Kalle; Sørensen, Carsten (December 2010). "Digital Infrastructures: The Missing IS Research Agenda" (PDF). Information Systems Research. 21 (4): 748–759. doi:10.1287/isre.1100.0318. JSTOR 23015642.
  44. ^ Grieves, Michael; Vickers, John (17 August 2016). Digital Twin: Mitigating Unpredictable, Undesirable Emergent Behavior in Complex Systems. Transdisciplinary Perspectives on Complex Systems. pp. 85–113. doi:10.1007/978-3-319-38756-7_4. ISBN 978-3-319-38754-3.
  45. ^ Grieves, Michael. "Digital twin: manufacturing excellence through virtual factory replication. Retrieved from" (PDF).
  46. ^ Hamilton, Dean (2017-08-25). "Seeing double: why IoT digital twins will change the face of manufacturing". Networkworld. Retrieved September 23, 2018.
  47. ^ Cai, Yi (2017). "Sensor Data and Information Fusion to Construct Digital-twins Virtual Machine Tools for Cyber-physical Manufacturing". Procedia Manufacturing. 10: 1031–1042. doi:10.1016/j.promfg.2017.07.094.







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