A sustainable livelihood cost-benefit model to enhance the understanding of the dynamics between low income housing and location

To keep pace with increasing urbanisation pressures and a substantial inherited backlog, subsidised low-income housing and services have predominantly been provided on the peripheries of South African cities where land is cheaper and more readily available. While this strategy has been widely praised for its rapid delivery of more than a million low-income housing units. it has been severely critiqued for perpetuating the marginalisation of the poor by restricting their access to urban opportunities and leading to extensive commuting. which absorbs a disproportionate share of their time and already limited disposable income. with associated environmental costs in terms of resource use and greenhouse gas emissions. The alternative proposed has been the compact city model, involving curtailing outward expansion. increasing housing densities and promoting public transport. The merits of this model, have however. only been subjected to scant empirical testing in South Africa. This article seeks to make a contribution to the 'location-question' by empirically testing the hypothesis that low income housing in peripheral localities is more costly and less beneficial to society than the same housing provided in more central localities. In order to do this. a sustainable livelihood cost-benefit model was developed and applied in eight subsidised housing locations in two cities. Amongst others, measured variables were transportation costs, travel times. fuel consumption and accessibility to employment and other urban opportunities and amenities. The results indicate that more central localities do not necessarily perform better overall than more peripheral localities on the scores as measured. This is attributed to: the polycentric nature of our cities: and  the relatively lesser importance of access for lower-income households to formal employment nodes than to informal job opportunities within or near the low income settlement itself and in middle to high income residential areas. In addition to this. the needs of low-income households were found to change over time. which suggests that no single type of location will optimally serve all low income households, while at the same time being affordable to households and government

The power of integrated spatial modelling: RailSmart Planning Wanneroo

The Planning and Transport Research Centre has just completed a major Smart Cities project entitled “RailSmart Planning Wanneroo”. The output was an interactive digital platform which tests optimal public transport patronage and employment creation potential of various railway station development options. The process of formulating the system was fascinating as this paper will argue that the concept of modelling intrinsic within the Smart Cities concept is a return to 1950’s procedural planning policies such as mixed method planning and a bounded rationality. The project highlighted the danger of entrenching existing patterns if systems are fully automated and argues that the power in the smart modelling should be limited to informing scenarios to best test alternatives. The power of the dashboard does not lie in the results it generates but rather in the patterns and trends it displays. The paper begins by describing the project and its outputs this is followed by a deeper reflection on how this was achieved procedurally. The process of creating this dashboard laid bare the dilemmas of planning where planners serve more than one client as they are working for a client in the public realm and within a political reality

An infrastructure potential cost model for integrated land use and infrastructure planning

The purpose of the bulk infrastructure potential cost model is to provide a tool for planners to ensure the incorporation of bulk infrastructure cost considerations into the early, land suitability assessment phase of the integrated development planning process. In practice, infrastructure planning has generally tended to follow land use planning with infrastructure costs seeming to play no role in the generation of land use strategies. The output of the model is in the form of potential cost maps which facilitates the relative comparison of infrastructure costs for different density scenarios. Bulk engineering services infrastructure relating to water, sanitation and electricity have been included in the model. The theoretical underpinning of the model is threshold analysis. There are three essential elements of the bulk infrastructure cost model: threshold, density and cost. The manner in which the three pillars are incorporated into the model is through capacity analysis. The density levels set, convert into the number of additional person units required, which in turn translate into infrastructure capacity demand. Existing infrastructure network and facility design capacities are compared with current utilisation of infrastructure in order to quantify the capacity supply situation. The comparison of capacity demand with capacity supply determines whether or not additional infrastructure is required. If infrastructure is required, the required infrastructure investment is calculated. The resulting relative costs are mapped and incorporated into a wider land suitability assessment model to identify suitable land for low income residential development. The models are contextualised as Spatial Planning Support Systems, supporting a specific planning problem, with a strong spatial component, incorporating a multicriteria evaluation and cost model and being loosely-coupled with GIS. It is shown that although bulk infrastructure potential costs can be incorporated into the land suitability assessment process to enhance the land delivery decision making process, it is preferable to keep the cost analysis separate from the analysis of the more "softer" issues. Conclusion are made in relation to a number of key developmental issues: the sprawl/densification debate, land and housing policy issues, sustainability, integration, affordability and bulk services contribution rates.GeographyD. (Philosophy

Analysis of the use and perception of shared mobility: A case study in Western Australia

The sharing economy has acquired a lot of media attention in recent years, and it has had a significant impact on the transport sector. This paper investigates the existing impact and potential of various forms of shared mobility, concentrating on the case study of Wanneroo, Western Australia. We adopted bibliometric analysis and visualization tools based on nearly 700 papers collected from the Scopus database to identify research clusters on shared mobility. Based on the clusters identified, we undertook a further content analysis to clarify the factors affecting the potential of different shared mobility modes. A specially designed questionnaire was applied for Wanneroo’s residents to explore their use of shared mobility, their future behaviour intentions, and their perspectives on the advantages and challenges of adoption. The empirical findings indicate that the majority of respondents who had used shared mobility options in the last 12 months belong to the low-mean-age group. The younger age group of participants also showed positive views on shared mobility and would consider using it in the future. Household size in terms of number of children did not make any impact on shared mobility options. Preference for shared mobility services is not related to income level. Bike sharing was less commonly used than the other forms of shared mobility

Measuring the Accessibility of Public Transport: A Critical Comparison Between Methods in Helsinki

This research compares two location-based methods of evaluating public transport accessibility and applies them in Helsinki. After discussing a series of methodological aspects, the authors calculate the Structural Accessibility Layer (SAL) public transport indicator and the Public Transport and Walking Accessibility Index (PTWAI) for a grid with 8,325 zones, comparable in size to the smallest census unit. Both methods are operational for urban planners and policy makers interested in a relatively straightforward way of quantifying the accessibility of sustainable transport modes such as public transport. The results display similar accessibility patterns when moving from larger to smaller isochrones (60 to 38 min). However, the findings are inconclusive between SAL and PTWAI: SAL (38 min) displays good accessibility by public transport (more than 94 % of the population living within two-thirds of the metropolitan area has very high and high access to public transport), but PTWAI indicates that 35 % of the population, primarily households with children (43 %), experience low and very low access. The contrasting results are mainly due to the derivation of the two indicators and have considerable implications for policy making. The findings of this research imply that PTWAI is preferable to planning assessments regarding public transport, given its relatively richer content. However, for multi-mode-based accessibility categorization, SAL appears more appropriate. It is the analyst’s role to understand the objective and contents of each index and choose the tool fit for their purpose. Then, a judgement should be made on the trade-off between the detail of the measures and results and the computational burden. Given the sensitivity of the models to various input parameters and assumptions, cross-validation and replication are key for ascertaining the credibility and usefulness of the models. Document type: Articl

Cross-docking: A systematic literature review

This paper identifies the major research concepts, techniques, and models covered in the cross-docking literature. A systematic literature review is conducted using the BibExcel bibliometric analysis and Gephi network analysis tools. A research focus parallelship network (RFPN) analysis and keyword co-occurrence network (KCON) analysis are used to identify the primary research themes. The RFPN results suggest that vehicle routing, inventory control, scheduling, warehousing, and distribution are most studied. Of the optimization and simulation techniques applied in cross-docking, linear and integer programming has received much attention. The paper informs researchers interested in investigating cross-docking through an integrated perspective of the research gaps in this domain. This paper systematically reviews the literature on cross-docking, identifies the major research areas, and provides a survey of the techniques and models adopted by researchers in the areas related to cross-docking

The Challenge of Spoken Language Systems: Research Directions for the Nineties

A spoken language system combines speech recognition, natural language processing and human interface technology. It functions by recognizing the person's words, interpreting the sequence of words to obtain a meaning in terms of the application, and providing an appropriate response back to the user. Potential applications of spoken language systems range from simple tasks, such as retrieving information from an existing database (traffic reports, airline schedules), to interactive problem solving tasks involving complex planning and reasoning (travel planning, traffic routing), to support for multilingual interactions. We examine eight key areas in which basic research is needed to produce spoken language systems: (1) robust speech recognition; (2) automatic training and adaptation; (3) spontaneous speech; (4) dialogue models; (5) natural language response generation; (6) speech synthesis and speech generation; (7) multilingual systems; and (8) interactive multimodal systems. In each area, we identify key research challenges, the infrastructure needed to support research, and the expected benefits. We conclude by reviewing the need for multidisciplinary research, for development of shared corpora and related resources, for computational support and far rapid communication among researchers. The successful development of this technology will increase accessibility of computers to a wide range of users, will facilitate multinational communication and trade, and will create new research specialties and jobs in this rapidly expanding area

The Challenge of Spoken Language Systems: Research Directions for the Nineties

A spoken language system combines speech recognition, natural language processing and human interface technology. It functions by recognizing the person's words, interpreting the sequence of words to obtain a meaning in terms of the application, and providing an appropriate response back to the user. Potential applications of spoken language systems range from simple tasks, such as retrieving information from an existing database (traffic reports, airline schedules), to interactive problem solving tasks involving complex planning and reasoning (travel planning, traffic routing), to support for multilingual interactions. We examine eight key areas in which basic research is needed to produce spoken language systems: (1) robust speech recognition; (2) automatic training and adaptation; (3) spontaneous speech; (4) dialogue models; (5) natural language response generation; (6) speech synthesis and speech generation; (7) multilingual systems; and (8) interactive multimodal systems. In each area, we identify key research challenges, the infrastructure needed to support research, and the expected benefits. We conclude by reviewing the need for multidisciplinary research, for development of shared corpora and related resources, for computational support and far rapid communication among researchers. The successful development of this technology will increase accessibility of computers to a wide range of users, will facilitate multinational communication and trade, and will create new research specialties and jobs in this rapidly expanding area

Development and Function of Immune Cells in an Adolescent Patient with a Deficiency in the Interleukin-10 Receptor

OBJECTIVE:: Monogenic defects in the interleukin-10 (IL-10) pathway are extremely rare and cause infantile-onset inflammatory bowel disease (IBD)-like pathology. Understanding how immune responses are dysregulated in monogenic IBD-like diseases can provide valuable insight in “classical” IBD pathogenesis. Here, we studied long-term immune cell development and function in an adolescent IL-10 receptor (IL10RA)-deficient patient who presented in infancy with severe colitis and fistulizing perianal disease and is currently treated with immune suppressants. METHODS:: Biomaterial was collected from the IL10RA-deficient patient, pediatric IBD patients and healthy controls. The frequency and phenotype of immune cells were determined in peripheral blood and intestinal biopsies by flow cytometry and immunohistochemistry. Functional changes in monocyte-derived dendritic cells and T cells were assessed by in vitro activation assays. RESULTS:: The IL10RA-deficient immune system developed normally with respect to numbers and phenotype of circulating immune cells. Despite normal co-stimulatory molecule expression, bacterial lipopolysaccharide-stimulated monocyte-derived dendritic cells from the IL10RA-deficient patient released increased amounts of TNFα compared to healthy controls. Upon T-cell receptor ligation, IL10RA-deficient peripheral blood mononuclear cells released increased amounts of T cell cytokines IFNγ and IL-17 agreeing with high numbers of T-bet and IL-17 cells in intestinal biopsies taken at disease onset. In vitro, the immunosuppressive drug thalidomide used to treat the patient decreased peripheral blood mononuclear cell-derived TNFα production. CONCLUSIONS:: With time and during immunosuppressive treatment the IL10RA- deficient immune system develops relatively normally. Upon activation, IL-10 is crucial for controlling excessive inflammatory cytokine release by dendritic cells and preventing IFNγ and IL-17-mediated T-cell responses