Jürgen Hackl

Jürgen Hackl
University of Cambridge | Cam · Department of Engineering

Dipl.-Ing. Dipl.-Ing. Dr.sc.ETH Zurich BSc

About

53
Publications
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Introduction
Dr. Jürgen Hackl is an Assistant Professor at the University of Liverpool. His research interests lie in complex urban systems and span both computational modelling and network science. Much of his work has been on improving the understanding, design, and performance of complex interdependent infrastructure systems, affected by natural hazards. Presently, he works on getting a better understanding of how the topology of a complex system influences dynamic processes.

Publications

Publications (53)
Article
Digital fabrication is growing in adoption within the architecture, engineering, and construction industry. Because digital fabrication often requires a systematic rethinking of the design process, research emphasizes new understanding is needed for digital systems across multiple areas, including technical development, technological systems, organ...
Article
Full-text available
A significant portion of railway network income is spent on the maintenance and restoration of the railway infrastructure to ensure that the networks continue to provide the expected level of service. The execution of the interventions – that is, when and where to perform maintenance or restoration activities, depends on how the state of the infras...
Article
This paper demonstrates how to make investment decisions that optimally improve water supply resilience, taking into consideration both future uncertainty and management flexibility. The demonstration is done by evaluating investment strategies for a 38 Ml/d water treatment plant serving an urban area with approximately 75 000 inhabitants, where th...
Conference Paper
Full-text available
Half of the global population lives in cities, and it is still increasing as people are moving to cities in search of better education, job opportunities, and so on. The existing infrastructures of the cities are being stretched beyond their capacity and requirements for well-organized urban environment and efficient urban management are rising. Ur...
Conference Paper
Water is an essential resource for our society. We require water for our everyday needs, such as drinking, cooking, showering. On average, one person in Taiwan consumes 360 litres per day [1]. In addition to personal use, water is also essential for many industrial applications, including agriculture, construction or semiconductor industry. Due to...
Conference Paper
Full-text available
Digital Fabrication is an emerging systemic innovation in the architecture, engineering and construction sector. However , the design process for digital fabrication lacks an integrated management process or digital collaboration platform. One reason may be a lack of industry stakeholder needs for such processes and platforms. To explore and facili...
Article
Full-text available
Full article link: https://www.taipeitimes.com/News/editorials/archives/2020/03/27/2003733445 In this article, we suggest the Government to investigate and develop Digital Twin technology to enhance nationwide health and business resilience for the future of the people in Taiwan.
Article
Determining the risk related to transportation networks due to the occurrence of (natural) hazard events often requires computer support. A simulation-based modeling environment can be useful when modeling a set of related events that lead up to the estimation of the probable consequences of hazard events, which affect network managers and society....
Article
How and when transportation networks are restored following a natural hazard event plays a key role in post-event recovery. However, determining the optimal repair strategies considering user costs requires intensive computational effort impeding the application in practice. This paper uses a modified network robustness index (MNRI), a measure of r...
Thesis
Full-text available
Infrastructure systems are important for social development and economic growth. They play a fundamental role in the use and distribution of spatial services, such as transportation and communication. Recent historical events such as the 2002 European flood, hurricane Katrina (2005), or the Tōhoku earthquake and tsunami (2011) have shown that the a...
Article
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Understanding traffic flow in urban areas has great importance and implications from an economic, social and environmental point of view. For this reason, numerous disciplines are working on this topic. Although complex network theory made their appearance in transportation research through empirical measures, the relationships between dynamic traf...
Conference Paper
Full-text available
Coping with the resilience of infrastructure systems is important in order to be prepared for disruptive events such as natural hazards. It is essential to understand how and in what order damaged infrastructure objects should be restored so that they can provide adequate service again. Infrastructure managers making such decisions must also take i...
Article
Full-text available
Human mobility is a key element in the understanding of epidemic spreading. Thus, correctly modeling and quantifying human mobility is critical for studying large-scale spatial transmission of infectious diseases and improving epidemic control. In this study, a large-scale agent-based transport simulation (MATSim) is linked with a generic epidemic...
Article
Full-text available
Hydraulic risk assessment of bridges in mountain regions is an essential task because such a bridge failure could have serious social-economic consequences, especially if it renders an area inaccessible. Nowadays, UAVs could provide a fast and cost-effective way to obtain the information with the high temporal and spatial resolution required for su...
Conference Paper
Full-text available
Human mobility is a key element in the understanding of epidemic spreading. Thus, correctly modelling and quantifying human mobility is critical for studying large-scale spatial-transmission of infectious diseases and improving epidemic control. In this study, a large-scale agent-based transport simulation (MATSim) is linked with a generic epidemic...
Article
Full-text available
Networks such as transportation, water, and power are critical lifelines for society. Managers plan and execute interventions to guarantee the operational state of their networks under various circumstances, including after the occurrence of (natural) hazard events. Creating an intervention program demands knowing the probable direct and indirect c...
Article
Most real and engineered systems, including transportation infrastructure, are embedded in space and interact with one another in a variety of ways. To study such systems, a novel multi-layer spatially embedded random network model is proposed. In the development of this model, concepts from spatial statistics and graph theory are used to map compl...
Article
The quantification of probable network-related consequences resulting from the occurrence of (natural) hazard events supports network managers in determining the most suitable interventions to execute. This assessment should include the modelling of consequences related to the use of the network and the levels of service. A method is presented to q...
Article
A quantitative approach to conduct a specific type of stress test on road networks is presented in this article. The objective is to help network managers determine whether their networks would perform adequately during and after the occurrence of hazard events. Conducting a stress test requires (i) modifying an existing risk model (i.e., a model t...
Article
Bridges, as all objects in road networks, are built to provide a specified level of service over a specified time period. This level of service ensures that acceptable levels of health, safety, and prosperity of society are guaranteed. The level of service, required from the transportation infrastructure, changes over time, as does the ability of i...
Article
Disruptive events, such as earthquakes, floods, and landslides, may disrupt the service provided by transportation networks on a vast scale, as their occurrence is likely to cause multiple objects to fail simultaneously. The restoration program following a disruptive event should restore service as much, and as fast, as possible. The estimation of...
Article
Full-text available
Networks, such as transportation, water, and power, are critical lifelines to society. Managers plan and execute interventions to guarantee the operational state of their networks under various circumstances, including after the occurrence of (natural) hazard events. Creating an intervention program demands knowing the probable consequences (i.e.,...
Article
Emerging methodologies for risk assessments of civil infrastructure networks require the coupling of several spatiotemporal models that need to be executed multiple times with varying parametrizations to account for model uncertainty and to investigate "what-if " scenarios. These requirements led to the development of a software environment to supp...
Conference Paper
Full-text available
tikz-network is an open source software project for visualizing graphs and networks in LaTeX. It aims to provide a simple and easy tool to create, visualize and modify complex networks. The packaged is based on the PGF/TikZ languages for producing vector graphics from a geometric/algebraic description. Particular focus is made on the software usabi...
Article
Many bridge management systems use Markov models to predict the future deterioration of structural elements. This information is subsequently used in the determination of optimal intervention strategies and intervention programs. The input for these Markov models often consists of the condition states of the elements and how they have changed over...
Technical Report
Full-text available
TikZ-network is an open source software project for visualizing graphs and networks in LaTeX. It aims to provide a simple and easy tool to create, visualize and modify complex networks. The packaged is based on the PGF/TikZ languages for producing vector graphics from a geometric/algebraic description. Particular focus is made on the software usabi...
Presentation
Full-text available
Presentation for the 2nd Symposium on Spatial Networks at Oriel College in Oxford 2017.
Article
Full-text available
Emerging methodologies for natural hazard risk assessments involve the execution of a multitude of different interacting simulation models that produce vast amounts of spatio-temporal datasets. This data pool is further enlarged when such simulation results are post-processed using GIS operations, for example to derive information for decision-maki...
Article
Full-text available
Networks such as transport, water and power are critical lifelines to society. Network managers plan and execute interventions to guarantee their operational state under various circumstances, including after the occurrence of (natural) hazard events. Creating an intervention program demands knowing the probable network-related consequences (i.e.,...
Conference Paper
Full-text available
Road networks are essential for economic growth and development. Of the objects within a road network, bridges are of special interest, because their failure often results in relatively large interruptions to how the network is used, their replacement costs are generally large, and it usually takes a considerable amount of time to restore them once...
Chapter
Random networks are increasingly used to analyse complex transportation networks, such as airline routes, roads and rail networks. So far, this research has been focused on describing the properties of the networks with the help of random networks, often without considering their spatial properties. In this article, a methodology is proposed to cre...
Technical Report
Full-text available
The result of WP4 is a process to assess infrastructure related risks due to natural hazards with stress tests. The risk assessment process is applicable independent of the hazard to be considered, the infrastructure objects to be taken into account and the types of consequences to be considered. Additionally, the process can be used to take into c...
Article
Full-text available
Random networks are increasingly used to analyse complex transportation networks, such as airline routes, roads and rail networks. So far, this research has been focused on describing the properties of the networks with the help of random networks, often without considering their spatial properties. In this article, a methodology is proposed to cre...
Article
Reinforced concrete structures constitute an essential part of the building infrastructure. This infrastructure is aging, and a large number of structures will exceed the prescribed service period in the near future. The aging of concrete structures is often accompanied by corresponding deterioration mechanisms. One of the major deterioration mecha...
Conference Paper
Physical condition and performance of reinforced concrete bridges are currently measured by two types of models. The former one is the mechanistic-empirical model that has been extensively applied in the field of structural analysis. Using the mechanistic-empirical model, corrosion and cracking of concrete cover can be predicted in a continuous sca...
Article
Integrated modeling approaches are being increasingly used to simulate the behavior of, and the interaction between, several interdependent systems. They are becoming more and more important in many fields, including, but not being limited to, civil engineering, hydrology and climate impact research. It is beneficial when using these approaches to...
Conference Paper
In this paper, a process is presented to ensure that infrastructure is managed so that levels of infrastructure related risk due to natural hazards are acceptable. This is the process being proposed within Work Package 4 of the European Research Project “Novel indicators for identifying critical infrastructure at risk from natural hazards (INFRARIS...
Conference Paper
Full-text available
The concrete deterioration caused by corrosion is a complex physical, chemical and mechanical process. The modeling of this process is subjected to significant uncertainties, which are based on a simplistic model representation of the actual physical process and limited information on material, environmental and loading characteristics.The present...
Conference Paper
The determination of network related risks for transport infrastructure systems, such as road or railway networks, is a challenging task. Due to such complex systems, it is generally impossible to abstract the global behavior from the analysis of single components, especially under conditions such as failures or damages. People who manage infrastru...
Article
Full-text available
In Europe, extreme natural hazard events are not frequent but due to the complex interdependency of the infrastructure systems these events can have a devastating impact in any part of Europe. Protection against the impacts of natural hazards must be guaranteed for people to work and live in a secure and resilient environment. People who manage inf...
Article
Full-text available
Reinforced concrete (RC) structures constitute an essential part of the building infrastructure. This infrastructure is aging and a large number of structures will exceed the prescribed service period in the near future. The aging of concrete structures is often accompanied by corresponding deterioration mechanisms. One of the major deterioration m...
Thesis
Full-text available
Reinforced concrete structures constitute an important fraction of the building infrastructure. This infrastructure is aging and a large number of structures will exceed the prescribed service period in the next decades. The aging of concrete structures is often accompanied by correspondent deterioration mechanisms. One of the major deterioration m...
Article
Full-text available
Agreements in construction contracts between client and contractor always depend upon uncertainty. Asymmetric Information and contrasting interests give rise to conflicts between the involved parties; in many cases to be settled before the court. The article illustrates the contractual agreement from the viewpoint of the Principal-Agent Theory, whi...
Thesis
Full-text available
Contracts are essential components in the construction industry. They contain important provisions on performance and wage. Basically contractors and clients close contracts. The objective of the contract is, for the client or principal, to get some action from the contractor or agent. Before the agent signs the contract, the principal has to ask...
Book
Full-text available
Die Mathematik ist ein sehr breites und komplexes Themengebiet und aus den Ingenieurwissenschaften kaum noch wegzudenken. Doch da das Ingenieurwissen nicht nur aus Mathematik besteht, kann dieses leicht in den Hintergrund rücken. Wie gut, in einem solchen Fall ein verlässliches Lern- und Nachschlagewerk zur Hand zu haben! „Ingenieurmathematik I“ is...
Technical Report
Full-text available
Heft 1: Grundlagen, Gleichgewicht, Schwerpunkt, Mechanische Systeme, Innere Kräfte, Haftung und Reibung, Arbeitsprinzip
Technical Report
Full-text available
Heft 2: Grundlagen, Spannungs und Verformungszustand, Geometrische Größen, Stabtragwerke, Torsion, Energiemethoden in der Elastostatik, Stabilitätsprobleme

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Projects

Projects (3)
Project
The primary goal of infrastructure managers is to ensure that their infrastructure provides adequate service. This means that they have the continuous task of executing interventions to help prevent the loss of service and to restore service after it is lost, which can happen, for example, due to natural hazards such as floods, landslides, and earthquakes. In other words, they have the continuous task of making the infrastructure resilient. In the last decades, a significant portion of the resilience of transportation infrastructure has been attributed to how infrastructure managers restore service once it is lost. This reactive approach of resilience emphasizing a misguided focus on ``bouncing back'' to a normal state. But if resilience is to be a useful concept in informing design strategies, it must ultimately instruct how to change. This includes a need to plan proactively, and to adapt when necessary with some culturally acceptable risk and loss, and with transformative capacity. Long-term sustainability necessitates a shift from reactive to proactive planning. At present; however, sound scientific tools and methods that provide the required information for supporting decisions on investments in infrastructure resilience for natural hazard risk reduction are missing. These would allow for a fundamental, fact-based discussion about long-term investments in measures protecting transportation infrastructures from natural hazards.
Project
Conducting a risk and resilience assessment can help identify probable hazard events, and evaluate their impact on networks and users. Nonetheless, conducting such assessments can be a particularly challenging task due to a large number of scenarios (i.e., chains of interrelated events) that need to be taken into account, the modelling of these events, the relationships among them, and the availability of support tools to run the models in an integrated way. In building scenarios, multiple types of hazards need to be considered, along with the complex nature of networks; specifically, their large number of objects, their spatial distribution, and functional interrelationships. Moreover, it is crucial to estimate the performance of networks during the hazard events and through the recovery to an adequate level of service that is driven by restoration strategies. Therefore, network managers need to think of ways to model the cascade of events, interdependencies, and the propagation of uncertainties. As a result of these challenges, risk assessment methods for networks are the subject of increasing research interest in recent years. Most research has been focused either on the technical aspects of hazards or those of networks. Hence, there has been little work to bring research outputs, concerning the modelling of hazard events and network vulnerability, together in a way that their spatial and temporal uncertain behaviors are assessed in a unified framework that fosters multidisciplinary collaboration. This topic of work includes future work to provide such a computational platform to estimate risk and resilience, supporting the combination of models from different disciplines, and their modular update and replacement.
Project
Network science provides powerful analytical, statistical, and computational methods to describe the behavior of complex systems. They help us to model and control power grids, transportation, and communication infrastructures, to study dynamical processes in computational physics and systems biology, to analyze social and economic networks, and to extract knowledge from large corpora of relational data. While the potential of analyzing graph or network representations of relational data is undisputed, we increasingly have access to data on networks that contain more than just dyadic relations. For example, data on user mobility, traffic flows on road networks or supply chains. These show that spatial-temporal-resolved or sequential data not only tell us who is related to whom, but also when, where, and in which order relations occur. Recent work has exposed that the timing and order of relations in such data can introduce higher-order, non-dyadic dependencies that are not captured by state-of-the-art graph representations. My aim is to develop a new generation of network analytic methods for spatial-temporal networks, enabling space and time-aware network analytic methods that consider both the temporal and topological dimension of complex systems.