Nan Li

Nan Li
Tsinghua University | TH · Department of Construction Management

PhD, PE

About

87
Publications
46,774
Reads
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2,889
Citations
Introduction
Skills and Expertise
Additional affiliations
July 2014 - present
Tsinghua University
Position
  • Professor (Assistant)

Publications

Publications (87)
Article
Intelligent construction is an important construction trend. With the growing number of intelligent autonomous systems implemented in the construction area, understanding and predicting human motion becomes increasingly important. Based on such predictions, the autonomous systems can optimize their actions to improve the efficiency of human-robot i...
Article
Full-text available
Management of urban seismic resilience relies on effective assessment approaches. However, developing an approach for the quantitative assessment at the urban scale remains to be a challenging task due to the complexity and heterogeneity of urban systems. Accordingly, Part I proposed a Restored Quality of Life-based approach to bridge this gap. As...
Article
Full-text available
With rapid urbanization, today's cities are increasingly vulnerable to unpredictable and catastrophic environmental hazards such as earthquakes. A quantitative approach for seismic resilience assessment at the urban scale is still a challenging task because of the extreme complexity of urban systems. This study proposes a Restored Quality of Life-b...
Chapter
This paper first provides an overview of the urban regeneration process of Beijing since the1970s, with a focus of the shift from material promotion to historical cultural preservation and sustainability promotion over the years, and a highlight of the contemporary trend of redesign of community public space, which has attracted considerable attent...
Article
Infrastructure systems play a crucial role in ensuring the safety of cities and the well‐being of residents after earthquakes. Meanwhile, infrastructure systems are vulnerable to earthquakes and may fail to provide necessary services, highlighting the significant need to improve seismic emergency performance. Nevertheless, the seismic emergency per...
Conference Paper
The behavior of critical infrastructure systems (CISs) greatly depends on the performance and reliability of the human agents that interact with the CISs. To accurately assess and predict the behavior of interdependent CISs, interdependent CISs models must not only consider the heterogeneities and interdependencies of the systems, but also the huma...
Article
Full-text available
In recent years, research has found that people have stable predispositions to engage in certain behavioural patterns to work safely or unsafely, which vary among individuals as a function of their personality features. In this regard, an innovative machine learning model has been recently developed to predict workers’ behavioural tendency based on...
Article
Interdependencies among urban critical infrastructure systems (CISs) significantly impact the reliability and performance of CISs and the resilience of modern societies. Although several approaches exist for modeling interdependent CISs and studying their behavior, models developed in previous studies often fail to incorporate CIS domain knowledge,...
Article
Cascading failure modeling in interdependent critical infrastructure systems (CISs) is an important but challenging work that lays the foundation for disaster impact assessment and recovery planning. However, despite the increasing volume of studies that examine cascading failure across interdependent CISs, the majority of modeling approaches propo...
Conference Paper
Full-text available
The accurate modeling of critical infrastructure systems (CISs) and their interdependencies is essential to assessing and predicting the behavior of interdependent CISs under various operation scenarios. Existing modeling approaches have limited ability to incorporate CIS domain knowledge and capture the systemic heterogeneity among the CISs, and t...
Article
Business interruption ratio (BIR), the ratio of reduced production or service level of a business to the predisaster level when it reopens in the aftermath of a disaster event, is a significant indicator of the overall disaster-induced economic impacts. This study proposes a new analytical framework for modeling the BIR of businesses in different e...
Article
The increasing accessibility to digital traces of human whereabouts in cities has offered numerous new opportunities for exploring patterns of human mobility in urban spaces. Prior research pointed out that there exist two distinct subpopulations in cities, namely returners and explorers, whose mobility patterns differ in the extent to which their...
Research
In this study, a new fire evacuation simulation model, named FREEgress (Fire Risk Emulated Environment for Egress), is developed to simulate the dynamic influences of heat, temperature, toxic gas and smoke particles on evacuees' mobility, navigation decision making and health conditions. FREEgress (1) introduces evacuee agents who are aware of and...
Article
Fire emergencies impose significant threats to building occupants. During evacuation, fire has significant impacts on evacuees' behaviors, by e.g., changing their route availability, disturbing their perception of the environment due to reduced visibility, impairing their mobility that is usually associated with severe injuries, and causing signifi...
Article
Regions impacted by natural disasters such as earthquakes may suffer enormously from interruptions to their economic systems, which usually have long-lasting and profound impacts. Business closure length (BCL), which refers to the post-disaster period during which businesses completely stop their operation, is a critical indicator of the overall im...
Conference Paper
Owners’ safety management behaviors in the construction industry are attracting increasing attention. However, previous research mostly focused on specific safety management practices on construction sites but ignored the influence of safety leadership and safety culture on owners’ safety management behaviors. To fill this gap, this study aimed to...
Article
Full-text available
Earthquake emergencies require a variety of behavioral responses in order to ensure the safety of occupants, which is different from simply exiting a building in fire emergencies. This makes it more complex to train building occupants in order to acquire skills that align to best practices for immediate earthquake response and post-earthquake evacu...
Article
The systemic heterogeneity between different critical infrastructure systems (CISs) can significantly influence the failure propagation process across the systems. For instance, when power supply systems are affected by an earthquake, physical damages mainly occur at nodes and seldom occur at links, since the cables are flexible enough to withstand...
Article
Human behavior is fundamental to human safety and the outcomes of building emergencies. It is correlated with social environments, building environments and emergency situations. This study presents a review about human-human interactions (i.e., interactions among people or groups of people and their influence on behavior during emergencies), human...
Article
Emergency evacuation in metro stations could be highly challenging due to complex underground environments, dynamic hazards and high-density crowds. There are different types of metro passengers, such as first-time visitors and daily commuters, who may possess different levels of prior spatial knowledge about the metro station. While spatial knowle...
Article
Understanding human behavior in building emergencies can benefit a wide spectrum of applications, which can ultimately contribute to the improvement of human safety in buildings, and potentially benefit outdoor emergency responses as well. This paper presents a holistic review of prior studies on occupant behavior during building emergencies, with...
Article
This study examines the effects of architectural visual access on people's wayfinding behavior and evacuation performance during building emergencies using virtual reality. Fire evacuation experiments were conducted in an immersive virtual metro station, which was based on a real metro station in Beijing, China. A total of 226 participants, positio...
Article
This study aimed to examine the influence of crowd flow on human evacuation behavior during building fire emergencies, when evacuees perceive high uncertainty in the environment and experience mental stress. Evacuation experiments were conducted in an immersive virtual metro station, in which each participant was presented with one of three differe...
Conference Paper
Hospitals play a crucial role in the mitigation and recovery of earthquake-hit regions, which are expected to be resilient enough so as to provide medical care that is badly needed in the aftermath of earthquakes. Nevertheless, there lack appropriate quantitative assessment approaches of hospital earthquake resilience, which makes it challenging fo...
Chapter
Driven by the fast development of virtual reality (VR) technologies, immersive virtual environments (IVEs) have been frequently used to conduct human behavior experiments for studying human behavior in building fire emergencies. Avatars in these IVEs are usually used to provide social influence and improve the sense of presence experienced by parti...
Article
Extreme weather events (EWEs), due to their high uncertainty, massive scale, irreversibility and destructiveness, may significantly impact cities, including causing notable perturbation to urban human mobility. Recent research has substantially advanced the knowledge on general human mobility patterns in cities, primarily about the spatiotemporal c...
Article
Critical infrastructure systems (CISs), increasingly suffering from various hazards in recent decades, are in urgent need of improving their resilience. So far few approaches for CISs resilience improvement have recognized that different resilience improvement efforts could have synergetic or conflicting correlations between them. There lack system...
Article
Pervasive unsafe behaviors of construction workers are the primary cause of accidents on construction job sites. The workers' safety-related behaviors are subject to a variety of factors, such as interactions with coworkers and interventions by management teams. The impacts of these factors have attracted considerable attention in academia but are...
Article
This study aimed to examine the effect of repeated exposures to indoor environments on people’s indoor wayfinding performance, both under normal condition and during fire emergency which could induce significant mental stress. Indoor wayfinding experiments were conducted in an immersive virtual museum developed using virtual reality technologies. P...
Conference Paper
Full-text available
Prior studies have found significant gender effect on people's wayfinding strategies in indoor environments. It is unclear, however, whether the gender effect is significant on people's actual wayfinding performance, especially when the wayfinding task is performed under stress, such as in a building fire evacuation situation. To address this gap,...
Conference Paper
Full-text available
Human behavior is one of the most influencing factors of safety during emergencies. Having a robust understanding of human behavior can improve both emergency management practices and design strategies for built environments. Traditional methods to study human behavior include emergency drills, post-event surveys, controlled laboratory experiments,...
Article
Full-text available
Critical infrastructure systems (CISs) have a fundamental role in delivering commodities that are essential to various functions in urban systems. The resilience of CISs concerns the robustness of system performance against extreme events, the ineffectiveness of disturbance propagation, and the efficiency of post-disaster system performance restora...
Article
Here we report a study designed to examine the influence of spatial exploration mode on people's wayfinding performance during a building fire emergency. Using immersive virtual environments, we asked the participants to actively or passively explore a virtual museum to look for hidden treasure keys and then a treasure point. Half of the participan...
Article
Urban lifeline systems play vital roles in sustaining fundamental functionalities in urban areas. These systems, working collaboratively and synergistically, form a complex system of systems, in which disruptions in one system can rapidly propagate to others, posing a great challenge for the identification and protection of critical infrastructure...
Article
Safety climate has a significant impact on safety motivation. Most prior studies focused on how motivated employees are in a unidimensional safety motivation scale, but they have overlooked why employees are motivated to work safely. The self-determination theory (SDT) is adopted in the present study to investigate how safety climate factors can pr...
Article
Eco-feedback as an approach to intervene in energy consumption behavior and encourage energy conservation has achieved considerable success in recent decades. Conclusions about the performance of eco-feedback systems in the literature were mostly drawn based on their short-term performance, during which eco-feedback information was continuously pro...
Article
The twenty-first century will witness massive urban expansion and growth of the urban population, which has global implications for future pathways of sustainable development. Addressing new and heightened demands on the environment, energy resources, and infrastructure will require holistic comprehension and actionable approaches to the city as th...
Article
Leadership is proven as a key factor impacting safety while researchers and practitioners are fostering proactive approaches to preventing workplace injuries. Practitioners’ lack of leadership is one of the major causes for the continuous high-level accident frequency within the construction projects. An important yet still unsettled academic issue...
Conference Paper
Full-text available
Cities cover three percent of the world’s land, yet are responsible for up to eighty percent of global greenhouse gas emissions and seventy-five percent of natural resource consumption. They impact air and water quality, alter resource consumption patterns, and pose unique challenges for the environment, energy, and infrastructure. Addressing these...
Article
Using the latest advances in virtual reality (VR) technologies, it is possible to create immersive virtual environments (IVEs) that can be used for behavioral experiments in controlled setups to examine individual evacuee behaviors. As a first step to achieving sufficient ecological validity, this study proposes an approach for assessing the sense...
Article
Behavior-based safety (BBS) methods have been widely reported as an important contributor to the prevention of accidents and improvement of safety performance in construction projects. However, most existing BBS methods fail to look into the impact of the interactions between workers and their supervisors. To overcome this limitation, the impact of...
Article
To reduce energy consumption in buildings, researchers have in the recent decade explored the potential of changing occupants’ energy consumption behaviors using eco-feedback technologies. Energy consumption behavior is a type of consumer behavior, which has been proven culture-specific in prior research. This paper aims to assess the impact of cul...
Article
Full-text available
Developing major infrastructure and construction (MIC) projects is complicated, since it involves multifaceted policy issues. As a result, appropriate participatory mechanisms have been increasingly employed to improve the legitimacy of the project decision process. Yet it cannot always guarantee a mutually acceptable solution since the expectation...
Article
Building emergencies, especially structure fires, are threats to the safety of both building occupants and first responders. It is difficult and dangerous for first responders to perform search and rescue in an unfamiliar environment, sometimes leading to secondary casualties. One way to reduce such hazards is to provide first responders with timel...
Article
Purpose – City is an artificial dynamic open giant complex system, whose multifunctional and interdisciplinary characteristics leads to significant complexity. While challenges arising from individual urban functions have been the focus of urban studies, major urban challenges such as traffic congestion and inefficiency of resource usages may origi...
Article
Owners' role in project safety improvement is drawing increasing attention in the academia. Their greatest leverage is the leadership to influence safety perception, motivation and behavior of other stakeholders. However, previous studies have not paid enough attention to owners' leadership and its impacting mechanisms, nor have they identified eff...
Article
With ever increasing complexities, construction projects are constantly exposed to a variety of risks associated with all stages of project execution from the initial assessment of strategic options through procurement, fabrication, construction, and commissioning. The successful delivery of construction projects and assurance of project objectives...
Article
Critical Infrastructure (CI) plays a vital role in sustaining fundamental functionalities and services in urban systems. As these CI systems are getting more interdependent, disturbances in one CI system often propagate to other systems, imposing significant cascading and devastating risks on cities. This paper introduces a conceptual framework for...
Conference Paper
Full-text available
Assessing the effectiveness of energy conservation measures (ECMs) before their actual implementation in buildings is critical. It has become the mainstream to employ calibrated building energy models to quantify expected energy savings from ECMs and justify their application. However, there is empirical evidence that reveals noticeable discrepanci...
Article
The robustness of construction project schedules is a key factor that determines the capability of the schedules in offsetting the negative impact of uncertainties, which are the primary causes of project delays. This paper proposes a scenario-based proactive robustness optimization (SBPRO) method, which aims to improve the robustness of constructi...
Article
Knowing real-time locations of first responders and occupants at building emergency scenes can be extremely helpful in improving the efficiency of first-response operations and reducing the chances of fatalities and injuries. This paper introduces an iterative maximum likelihood estimation (IMLE) indoor localization algorithm for supporting buildin...
Article
Construction projects are subject to a wide range of constraints, such as project complexity, resource scarcity, and duration uncertainty. The critical chain project management (CCPM) has emerged as a method for construction scheduling. This paper proposes an improved CCPM framework to enhance the implementation of CCPM in construction project mana...
Conference Paper
Full-text available
Real-time access to indoor localization information is critical to the success of building emergency response operations. It enables first responders not only to locate themselves to avoid getting lost or disoriented, but also to quickly find and rescue trapped occupants. The environment-aware sequence-based localization (EASBL) is an algorithm pro...
Conference Paper
Full-text available
Energy consumption in commercial buildings amounts to 19% of total energy consumption in the U.S., and is expected to continue increasing in the foreseeable future. Heating, Ventilation, and Air Conditioning (HVAC) systems are major energy consumers in commercial buildings, and they are usually controlled in a way that all thermal zones in a buildi...
Article
With ever-rising energy demand and diminishing sources of inexpensive energy resources, energy conservation has become an increasingly important topic. Building heating, ventilation, and air conditioning (HVAC) systems are consid-ered to be a prime target for energy conservation due to their significant contribution to commercial buildings' energy...
Conference Paper
Full-text available
Energy consumption in commercial buildings has been increasing rapidly in the past decade. The knowledge of future energy consumption can bring significant value to commercial building energy management. For example, prediction of energy consumption decomposition helps analyze the energy consumption patterns and efficiencies as well as waste, and i...
Article
Full-text available
Radio frequency identification (RFID) technology-based indoor localisation solutions have been widely adapted by many industries. An important factor affecting the performance of RFID applications is the received signal strength indication (RSSI) values. Indoor setting and layout may have direct effects on the RSSI variability, which, in turn, affe...
Article
Accessibility of assets impacts the efficiency of various work processes during building operations. An effective in-building asset localization solution that can locate assets accurately is needed to improve the efficiency of building asset management. Multipath and fading effects caused by the complexity of buildings make it challenging to locate...
Conference Paper
Full-text available
Building emergencies are big threats to the safety of building occupants and first responders. When emergencies occur, unfamiliar environments are difficult and dangerous for first responders to search and rescue, sometimes leading to secondary casualties. One way to reduce such hazards is to provide first responders with timely access to accurate...
Article
Indoor location information is valuable to the construction industry for a wide range of purposes, including on-site personnel safety, asset security, facility maintenance, and in-building emergency response. Indoor location sensing includes presence detection and location calculation, for which a number of technologies and algorithms have been tes...
Conference Paper
Full-text available
Indoor localization is critical to emergency response operations in buildings, as building occupants need to be located for rapid rescue, and first responders need to be located for efficient onsite dispatch. This study proposes an indoor localization framework that utilizes the ever-increasing sensory and computational capabilities of smartphones....
Article
Building energy management and the necessity to reduce overall energy consumption is becoming an increasingly important topic. Especially in dynamic environments, where the setting and occupancy keep changing, knowing occupancy information, including the number and identities of the occupants and where they are located, can be beneficial in energy...
Conference Paper
Full-text available
Context awareness has the potential to improve various work processes in the construction industry, by automating the delivery of location specific information for a wide range of onsite information-intensive tasks, and supporting crucial management and decision making processes. Implementation of context awareness relies on an accurate and cost-ef...
Conference Paper
Full-text available
Heating, ventilation, and air conditioning (HVAC) is a major energy consumer in buildings, and implementing demand driven HVAC operations is a way to reduce HVAC related energy consumption. This relies on the availability of occupancy information, which determines peak/off-hour modes that impact cooling/heating loads of HVAC systems. This research...