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Crowded urban regions pose a complex urban challenge that can adversely affect urban residents, encompassing aspects like mental and physical well-being, overall livability and quality of life. The complexity in determining the factors influencing the crowding perception, which encompass subjective and situational psychological factors alongside physical and environmental attributes, imparts ambiguity to planners' approach. This study aims to unravel the intricate interplay between crowding and the physical attributes inherent in the built environment.

This literature review analyses theories linking urban planning and environmental psychology to uncover gaps in the relationship between urban design principles and residents' perceptions of crowding. It also explores influential variables affecting crowding perception and diverse methodologies across contexts.

The study built upon a broad literature review which is expected to summarise and classify the variables of urban planning components and approaches according to their impacts on the psychological perception of crowding. Furthermore, highlighting a number of recommendations that can be considered a guide for planners and urban designers to enhance the urban experience and reduce the perception of crowding.

This study seeks to improve the overall experience of crowding in densely populated urban areas. It accomplishes this by identifying influential factors and comprehending the associated outcomes in such contexts. Furthermore, it bridges perspectives from various fields to examine relevant policies and strategies to mitigate crowding consequences.

In urban studies, understanding how individuals perceive density is a complex challenge due to the subjective nature of this perception, which is influenced by sociocultural, personal and environmental factors. This study addresses these complexities by proposing a systematic framework for comprehending how people perceive density within urban contexts.

The methodology for developing the framework involved a systematic review of existing literature on the perception of density and related concepts, followed by integrating insights from empirical investigations. The framework designed through this process overcomes the limitations identified in previous research and provides a comprehensive guide for studying perceived density in urban environments.

The successful application of the framework on case studies in Glasgow and international settings enabled the identification of 20 critical spatial factors (buildings, public realm and urban massing) influencing density perception. The research provided insights into the subjective nature of density perception and the impact that spatial characters of urban form play, demonstrating the framework's effectiveness in understanding the impact of urban form, which is the realm of design and planning professions, on individual experiences.

The paper's originality lies in its comprehensive synthesis of the existing knowledge on the perception of density, the development of a user-responsive framework adaptable to future research and its application in case studies of different natures to identify recurrent links between urban form and user-specific constructs.

This study aims to investigate how density conditions caused by multiple kiosks in shopping mall walkways affect shoppers' shopping outcomes based on psychological reactance theory and behavioural constraint theory.

The experiment uses a one‐factor between‐subjects design with two levels of density conditions (high vs low). A total of 382 respondents participated.

The findings of this paper indicate that respondents perceive the environment with kiosks as crowded and this perception of crowdedness negatively affects their approach behaviour, leading to lower intentions to patronise.

Findings provide practical information to mall managers by indicating that kiosks within a shopping mall negatively affect shopper patronage and approach intentions. Thus, mall managers need to pay more attention to the environmental atmospherics of the mall itself.

The paper is the first empirical research which examines how kiosks within a mall affect shopper shopping responses. The findings of this study add to the existing literature by examining how kiosks within a mall impact shoppers' psychological states and subsequently their approach/avoidance behaviours towards the shopping mall and patronage intention.

The purpose of this paper is to explore innovations in customer experience at the intersection of the digital, physical and social realms. It explicitly considers experiences involving new technology-enabled services, such as digital twins and automated social presence (i.e. virtual assistants and service robots).

Future customer experiences are conceptualized within a three-dimensional space – low to high digital density, low to high physical complexity and low to high social presence – yielding eight octants.

The conceptual framework identifies eight “dualities,” or specific challenges connected with integrating digital, physical and social realms that challenge organizations to create superior customer experiences in both business-to-business and business-to-consumer markets. The eight dualities are opposing strategic options that organizations must reconcile when co-creating customer experiences under different conditions.

A review of theory demonstrates that little research has been conducted at the intersection of the digital, physical and social realms. Most studies focus on one realm, with occasional reference to another. This paper suggests an agenda for future research and gives examples of fruitful ways to study connections among the three realms rather than in a single realm.

This paper provides guidance for managers in designing and managing customer experiences that the authors believe will need to be addressed by the year 2050.

This paper discusses important societal issues, such as individual and societal needs for privacy, security and transparency. It sets out potential avenues for service innovation in these areas.

The conceptual framework integrates knowledge about customer experiences in digital, physical and social realms in a new way, with insights for future service research, managers and public policy makers.

At the beginning of the 20th century, three intertwined ambitions drove federal legislation over wildlife and biodiversity: establishment of multiple-use federal lands, the economic development of natural resources, and the maintenance of option values. We examine this federal intervention in natural resource use by analyzing roll call votes over the past century with a Random Utility Model (Manski, 1977) and conclude that economics mattered. So did ideology, but not uniformly. After World War II, the pro-environment vote which had been conservative shifted to being liberal. All these votes involved decisions regarding public land that reallocated the returns to users by changing the asset’s physical character or its usage rights. We suggest that long-term consequences affecting current resource allocations arose from disparities between broadly dispersed benefits and locally concentrated socioeconomic and geophysical (spatial) costs. We show that a primary intent of public land management has become to preserve multiple-use option values and identify important factors in computing those option values. We do this by demonstrating how the willingness to forego current benefits for future ones depends on the community’s resource endowments. These endowments are defined not only in terms of users’ current wealth accumulation but also from their expected ability to extract utility from natural resources over time.

PLANET OF SLUMS

DESIGNING HIGH-DENSITY CITIES FOR SOCIAL AND ENVIRONMENTAL SUSTAINABILITY

THE WHOLE BUILDING HANDBOOK : How to Design Healthy, Efficient and Sustainable Buildings

The growth of facilities management has brought with it a greater emphasis on the way in which we use office space. The drive for greater economic efficiency has resulted in more intense use of offices and the introduction of new office practices. This paper compares the effect of new office practices on office densities in both Australia and the UK. Comparing the office use across a range of organisation functions and use categories, it provides a framework for future performance measures within the selected markets and wider comparison of office space globally and, as such, establishes a foundation for the development of strategic asset plans based on clear measured objectives.

Constrained by requirements of efficiency and economy as well as tight building regulations, Hong Kong's high-density residential architecture is very different from architectural approaches that are typically taught in the architectural studio. This paper reports on a second year architectural studio project taught at The University of Hong Kong that uses the Open Building paradigm to integrate the constraints of a high-density environment, community considerations and building technology in the context of a mixed use programme to be constructed on small individual lots.

Following a series of short introductory exercises, the main studio assignment required groups of students to negotiate the design of individual projects and community areas within a given generic structural frame. Based on their individual design ideas and architectural programme, students developed a structural solution following a kit-of-parts approach. We describe the tasks and rule sets given as the studio framework and discuss students' response to this new type of architectural programme. Based on our experiences, we critically review initial studio settings, final outcomes and observations made during the teaching and learning process with regard to future implementations of similar open building studio projects.

The aims of this paper is to establish an appropriate physical-change-based renewal (PCBR) projects selection mechanism capable of selecting the combination of the PCBR projects that can make up an integrated urban renewal program in high-density cities.

The research design follows a sequential integrated methodology that combines the calculation algorithms of Fuzzy Analytic Network Process (Fuzzy-ANP) with Zero-One Goal Programming (ZOGP) to support decisions for the selection of PCBR projects. In the first phase, general criteria for assessing the sustainability performance of PCBR projects were collected from relevant literature. In the second phase, the Fuzzy-ANP was used to identify the priority weights of the candidate projects through clarifying the interdependent degree between the criteria and candidate projects. Finally, ZOGP method was selected as a predetermined number of PCBR projects among candidate projects.

The feasibility and effectiveness of this hybrid approach is then verified in a case study of Yuzhong District, Chongqing in China. The results of this study indicate that the integrated method is capable of directing the decision maker toward the best compromising solution of PCBR program that can achieve the maximization of sustainable benefits and allocate limited resources most efficiently.

The novelty of this paper consists in combining the algorithms of the Fuzzy-ANP method with those of the ZOGP model that serves as an effective analysis tool to address practical decision problems. This is the first hybrid algorithms to make PCBR projects selection decision that reach the maximization of the sustainable benefits, both in economic and socio-environmental terms.

Unmanned aerial vehicles (UAVs) have a wide variety of applications such as surveillance and search. Many of these tasks are better executed by multiple UAVs acting as a group. One of the main problems to be tackled in a high‐density UAV traffic scenario is that of collision avoidance among UAVs. The purpose of this paper is to give a collision avoidance algorithm to detect and resolve the conflicts of projected path among UAVs.

The collision avoidance algorithm developed in the paper handles multiple UAV conflicts by considering only the most imminent predicted collision and doing a maneuver to increase the line‐of‐sight rate to avoid that conflict. After the collision avoidance maneuver, the UAVs fly to their destinations via Dubins shortest path to minimize time to reach destination. The algorithm is tested on realistic six degree of freedom UAV models augmented with proportional‐integral controllers to hold altitude, velocity, and commanded bank angles.

The paper shows, through extensive simulations, that the proposed collision avoidance algorithm gives a good performance in high‐density UAV traffic scenarios. The proposed collision avoidance algorithm is simple to implement and is computationally efficient.

The algorithm developed in this paper can be easily implemented on actual UAVs.

There are only a few works in the literature that address multiple UAV collision avoidance in very high‐density traffic situations. This paper addresses very high‐density multiple UAV conflict resolution with realistic UAV models.