Accessibility Analyst: An Integrated GIS Tool for Accessibility Analysis in Urban Transportation Planning

10.1068/b305 ◽  
2004 ◽  
Vol 31 (1) ◽  
pp. 105-124 ◽  
Author(s):  
Suxia Liu ◽  
Xuan Zhu
Keyword(s):  
Transportation Planning ◽  
Profile Analysis ◽  
Transportation Network ◽  
Urban Transportation ◽  
Impedance Measurement ◽  
Network Efficiency ◽  
Accessibility Analysis ◽  
Wide Range ◽  
Tool Accessibility ◽  
Travel Impedance

The authors present an integrated GIS tool, Accessibility Analyst, for accessibility analysis in urban transportation planning, built as an extension to the desktop GIS software package, ArcView. Accessibility Analyst incorporates a number of accessibility measures, ranging from catchment profile analysis to cumulative-opportunity measures, gravity-type measures, and utility-based measures, contains several travel-impedance measurement tools for estimating the travel distance, time, or cost by multiple travel modes along actual travel routes, and interoperates with GIS data-management and data-integration, spatial-analysis, network-analysis, surface-modelling, and spatial-visualisation functions. Undertaking accessibility analysis with use of Accessibility Analyst allows the user to take full advantage of a GIS to produce spatial distributions of accessibility over a region. It can be applied to a wide range of issues in urban transportation planning, such as for studies on the relationship between transportation and land use, evaluation of transportation network efficiency, transportation infrastructure planning, and for impact assessments relating to transportation policies.

The Characteristics of Resident Travel in Beijing Xizhimen Transport Terminal

2011 ◽  
Vol 225-226 ◽  
pp. 1212-1217
Author(s):  
Xue Mei Li ◽  
Jing Yin ◽  
Qian Che
Keyword(s):  
Travel Behavior ◽  
Transportation Planning ◽  
Large Scale ◽  
Transportation Network ◽  
Urban Transportation ◽  
The Other ◽  
Theoretical Support ◽  
Controllable Factors ◽  
Disaggregate Model ◽  
Core Facilities

Transport Terminals are core facilities of urban transportation system, and the joint of different transportation in urban transportation network. Because of their functions and place, they are faced with huge traffic pressure. So the research about the characteristics of resident travel in transport terminals could provide theoretical support for urban transportation planning, organizing and managing, finally improve urban transportation satisfaction among residents. Against this background, Xizhimen as the research object is a representative transport terminal in Beijing. Based on large-scale investigation, on one hand, the characteristics of residents travel behavior are analyzed qualitatively; on the other hand, by building the Disaggregate Model, analyze the utility functions of different travel modes quantitatively, to find some controllable factors to optimize transport terminal and improve their satisfaction.

Urban Transportation Network-Equilibrium and Design Models: Recent Achievements and Future Prospects

1984 ◽  
Vol 16 (11) ◽  
pp. 1445-1474 ◽  
Author(s):  
D E Boyce
Keyword(s):  
Case Studies ◽  
Transportation Planning ◽  
Transportation Network ◽  
Urban Transportation ◽  
Future Research ◽  
Network Equilibrium ◽  
Future Prospects ◽  
Design Models ◽  
Planning Methods

Three case studies pertaining to the development of scientifically rigorous methods in urban transportation planning are presented. Drawing on the lessons of these studies, an approach and attitude toward future research on planning methods and practice is considered.

Best Neighbor Heuristic Search for Finding Minimum Paths in Transportation Networks

1998 ◽  
Vol 1651 (1) ◽  
pp. 48-52 ◽  
Author(s):  
Jeffrey L. Adler
Keyword(s):  
Heuristic Search ◽  
Transportation Networks ◽  
Transportation Network ◽  
Search Problems ◽  
A Algorithm ◽  
Running Time ◽  
Search Effort ◽  
Wide Range ◽  
Path Search ◽  
Sparse Networks

For a wide range of transportation network path search problems, the A* heuristic significantly reduces both search effort and running time when compared to basic label-setting algorithms. The motivation for this research was to determine if additional savings could be attained by further experimenting with refinements to the A* approach. We propose a best neighbor heuristic improvement to the A* algorithm that yields additional benefits by significantly reducing the search effort on sparse networks. The level of reduction in running time improves as the average outdegree of the network decreases and the number of paths sought increases.

scholarly journals Hybrid Acrylated Chitosan and Thiolated Pectin Cross-Linked Hydrogels with Tunable Properties

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 266
Author(s):  
Shaked Eliyahu ◽  
Alexandra Galitsky ◽  
Esther Ritov ◽  
Havazelet Bianco-Peled
Keyword(s):  
Electrostatic Interactions ◽  
Profile Analysis ◽  
Hybrid Hydrogel ◽  
Texture Profile ◽  
Ph Values ◽  
X Ray Scattering ◽  
Wide Range ◽  
Michael Type Addition ◽  
Physical And Chemical ◽  
Hydrogel System

We developed and characterized a new hydrogel system based on the physical and chemical interactions of pectin partially modified with thiol groups and chitosan modified with acrylate end groups. Gelation occurred at high pectin thiol ratios, indicating that a low acrylated chitosan concentration in the hydrogel had a profound effect on the cross-linking. Turbidity, Fourier transform infrared spectroscopy, and free thiol determination analyses were performed to determine the relationships of the different bonds inside the gel. At low pH values below the pKa of chitosan, more electrostatic interactions were formed between opposite charges, but at high pH values, the Michael-type addition reaction between acrylate and thiol took place, creating harder hydrogels. Swelling experiments and Young’s modulus measurements were performed to study the structure and properties of the resultant hydrogels. The nanostructure was examined using small-angle X-ray scattering. The texture profile analysis showed a unique property of hydrogel adhesiveness. By implementing changes in the preparation procedure, we controlled the hydrogel properties. This hybrid hydrogel system can be a good candidate for a wide range of biomedical applications, such as a mucosal biomimetic surface for mucoadhesive testing.

scholarly journals A Kinetic Theory Model of the Dynamics of Liquidity Profiles on Interbank Networks

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 363
Author(s):  
Marina Dolfin ◽  
Leone Leonida ◽  
Eleonora Muzzupappa
Keyword(s):  
Kinetic Theory ◽  
Network Formation ◽  
Transition Probabilities ◽  
Stochastic Game ◽  
Theory Model ◽  
Point Of View ◽  
Network Efficiency ◽  
Modelling Framework ◽  
Wide Range ◽  
Complex Adaptive

This paper adopts the Kinetic Theory for Active Particles (KTAP) approach to model the dynamics of liquidity profiles on a complex adaptive network system that mimic a stylized financial market. Individual incentives of investors to form or delete a link is driven, in our modelling framework, by stochastic game-type interactions modelling the phenomenology related to policy rules implemented under Basel III, and it is exogeneously and dynamically influenced by a measure of overnight interest rate. The strategic network formation dynamics that emerges from the introduced transition probabilities modelling individual incentives of investors to form or delete links, provides a wide range of measures using which networks might be considered “best” from the point of view of the overall welfare of the system. We use the time evolution of the aggregate degree of connectivity to measure the time evolving network efficiency in two different scenarios, suggesting a first analysis of the stability of the arising and evolving network structures.

Structuring Urban Transportation Planning Decisions: Available Social Science Constructs

1970 ◽  
Vol 2 (3) ◽  
pp. 251-265 ◽  
Author(s):  
B. G. Hutchinson
Keyword(s):  
Urban Communities ◽  
Transportation Planning ◽  
Urban Transportation ◽  
Political Process ◽  
Evaluation Framework ◽  
The Political ◽  
Recent Experience ◽  
Efficiency Criterion ◽  
Planning Decisions ◽  
Welfare Theory

A welfare-theory-based framework for the evaluation of urban transportation investments is described. An economic efficiency criterion is developed in terms of the community demand schedules for accessibility and for environmental quality. A procedure for modifying this efficiency criterion to reflect income distribution goals is presented. It is argued that the necessary empirical information for this evaluation framework must be derived from the application of some consistent theory of democratic group decisions. A number of models of the political process are then reviewed. Recent experience with several institutional frameworks for planning is discussed and some of the principles of the models are used to evaluate this experience. The contributions that available models of the political process might make to the extension of the welfare-based-evaluation framework are then explored. The elementary extensions presented in the paper provide a basis for studying the goal formulation and weighting processes in particular communities. Comparative studies in a number of urban communities should lead to the development of a meaningful institutional framework for urban transportation planning activities.

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