### Resumé

mathematical modelling has become widely deployed within a broad range of

scientific practices, it has also gained a central position within technology development. The intersection of mathematical modelling and technology

development is especially interesting because of its increasing role in applying

scientific theoretical knowledge to concrete societal problems, and even more so,

because it is a relatively little studied practice. Based on a multi-sited ethnographic study of an industrial energy-efficiency project, this thesis presents an analysis of the central practices that materialised representative physical modelling and implemented operational regulation models. In order to show how the project’s representative modelling and technology development connected physical theory with concrete problems through different material mediations, the thesis draws on the notion of representation as used within science and technology studies to trace how the project translated between the various states of re-presentative mediations.

The first four chapters introduce the scope of the study and its wider

theoretical outset, the existing literature on simulation models, and the study’s

methodological and empirical approach. The purpose of this thesis is to describe the central practices that developed regulation technology for industrial production processes and to analyse how mathematical modelling contributed to this development. Because the variation between these practices spanned from work with physical theory to practical hands-on work with machines at operational production sites, the thesis aims to capture how these diverse practices operated and connected by closely following how they transformed and distributed knowledge artefacts.

Chapter 5 to 7 unfolds the empirical study structured as an investigation of

two opposite processes that occurred simultaneously; one that “abstracted” the

production machinery into theoretical physics (Chapter 5 and 6), and one that

“concretised” theories onto the production machinery (Chapter 7). Mathematical

models are especially interesting in this technology developing setup since they

formed a significant part of both the processes that abstracted machinery and the

processes that concretised theory and filled an important role in the coordination

between these two opposite processes. By following each stage in both opposite

processes, I seek to extend the existing comprehension of models’ technological and epistemological dimensions by describing the different material states the models went through from machine to theory and back again to the machine.

Chapter 8 analyses and discusses the different effects that were generated by

implementing the regulation model technology onto their target environments. The

thesis results in a discussion of what kinds of displacement effects these novel

technological solutions can be recognised to have generated. Structured around the intersections of certainty, agency, and dependences, the thesis’ findings are in chapter 9 extended to a discussion of the theoretical fundament through which we interpret the regulation project and its use of modelling. I demonstrate a novel framework that I term prescriptive application. Chapter 10 summarises and concludes on the recognitions that are drawn from the study.

Originalsprog | Engelsk |
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Forlag | Aalborg Universitetsforlag |
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Antal sider | 194 |

Status | Udgivet - 2013 |

### Citer dette

*Models in Action: Realising Abstractions*. Aalborg Universitetsforlag.

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*Models in Action: Realising Abstractions*. Aalborg Universitetsforlag.

**Models in Action : Realising Abstractions.** / Juhl, Joakim.

Publikation: Bog/antologi/afhandling/rapport › Ph.d.-afhandling › Forskning

TY - BOOK

T1 - Models in Action

T2 - Realising Abstractions

AU - Juhl, Joakim

PY - 2013

Y1 - 2013

N2 - This thesis is about mathematical modelling and technology development. Whilemathematical modelling has become widely deployed within a broad range ofscientific practices, it has also gained a central position within technology development. The intersection of mathematical modelling and technologydevelopment is especially interesting because of its increasing role in applyingscientific theoretical knowledge to concrete societal problems, and even more so,because it is a relatively little studied practice. Based on a multi-sited ethnographic study of an industrial energy-efficiency project, this thesis presents an analysis of the central practices that materialised representative physical modelling and implemented operational regulation models. In order to show how the project’s representative modelling and technology development connected physical theory with concrete problems through different material mediations, the thesis draws on the notion of representation as used within science and technology studies to trace how the project translated between the various states of re-presentative mediations.The first four chapters introduce the scope of the study and its widertheoretical outset, the existing literature on simulation models, and the study’smethodological and empirical approach. The purpose of this thesis is to describe the central practices that developed regulation technology for industrial production processes and to analyse how mathematical modelling contributed to this development. Because the variation between these practices spanned from work with physical theory to practical hands-on work with machines at operational production sites, the thesis aims to capture how these diverse practices operated and connected by closely following how they transformed and distributed knowledge artefacts.Chapter 5 to 7 unfolds the empirical study structured as an investigation oftwo opposite processes that occurred simultaneously; one that “abstracted” theproduction machinery into theoretical physics (Chapter 5 and 6), and one that“concretised” theories onto the production machinery (Chapter 7). Mathematicalmodels are especially interesting in this technology developing setup since theyformed a significant part of both the processes that abstracted machinery and theprocesses that concretised theory and filled an important role in the coordinationbetween these two opposite processes. By following each stage in both oppositeprocesses, I seek to extend the existing comprehension of models’ technological and epistemological dimensions by describing the different material states the models went through from machine to theory and back again to the machine.Chapter 8 analyses and discusses the different effects that were generated byimplementing the regulation model technology onto their target environments. Thethesis results in a discussion of what kinds of displacement effects these noveltechnological solutions can be recognised to have generated. Structured around the intersections of certainty, agency, and dependences, the thesis’ findings are in chapter 9 extended to a discussion of the theoretical fundament through which we interpret the regulation project and its use of modelling. I demonstrate a novel framework that I term prescriptive application. Chapter 10 summarises and concludes on the recognitions that are drawn from the study.

AB - This thesis is about mathematical modelling and technology development. Whilemathematical modelling has become widely deployed within a broad range ofscientific practices, it has also gained a central position within technology development. The intersection of mathematical modelling and technologydevelopment is especially interesting because of its increasing role in applyingscientific theoretical knowledge to concrete societal problems, and even more so,because it is a relatively little studied practice. Based on a multi-sited ethnographic study of an industrial energy-efficiency project, this thesis presents an analysis of the central practices that materialised representative physical modelling and implemented operational regulation models. In order to show how the project’s representative modelling and technology development connected physical theory with concrete problems through different material mediations, the thesis draws on the notion of representation as used within science and technology studies to trace how the project translated between the various states of re-presentative mediations.The first four chapters introduce the scope of the study and its widertheoretical outset, the existing literature on simulation models, and the study’smethodological and empirical approach. The purpose of this thesis is to describe the central practices that developed regulation technology for industrial production processes and to analyse how mathematical modelling contributed to this development. Because the variation between these practices spanned from work with physical theory to practical hands-on work with machines at operational production sites, the thesis aims to capture how these diverse practices operated and connected by closely following how they transformed and distributed knowledge artefacts.Chapter 5 to 7 unfolds the empirical study structured as an investigation oftwo opposite processes that occurred simultaneously; one that “abstracted” theproduction machinery into theoretical physics (Chapter 5 and 6), and one that“concretised” theories onto the production machinery (Chapter 7). Mathematicalmodels are especially interesting in this technology developing setup since theyformed a significant part of both the processes that abstracted machinery and theprocesses that concretised theory and filled an important role in the coordinationbetween these two opposite processes. By following each stage in both oppositeprocesses, I seek to extend the existing comprehension of models’ technological and epistemological dimensions by describing the different material states the models went through from machine to theory and back again to the machine.Chapter 8 analyses and discusses the different effects that were generated byimplementing the regulation model technology onto their target environments. Thethesis results in a discussion of what kinds of displacement effects these noveltechnological solutions can be recognised to have generated. Structured around the intersections of certainty, agency, and dependences, the thesis’ findings are in chapter 9 extended to a discussion of the theoretical fundament through which we interpret the regulation project and its use of modelling. I demonstrate a novel framework that I term prescriptive application. Chapter 10 summarises and concludes on the recognitions that are drawn from the study.

M3 - Ph.D. thesis

BT - Models in Action

PB - Aalborg Universitetsforlag

ER -