scholarly journals A Resilience-Based Model for the Seismic Assessment of the Functionality of Road Networks Affected by Bridge Damage and Restoration

2021 ◽  
Vol 6 (8) ◽  
pp. 112
Author(s):  
Alessandro Rasulo ◽  
Angelo Pelle ◽  
Bruno Briseghella ◽  
Camillo Nuti
Keyword(s):  
Traffic Congestion ◽  
Road Network ◽  
Hypothetical Case ◽  
Multi Stage ◽  
Proposed Model ◽  
Bridge Damage ◽  
Network Functionality ◽  
Seismic Resilience ◽  
Over Time

Road network functionality after an earthquake is a crucial aspect for an already struck community. In particular, bridges are susceptible to earthquake-induced damages and to lengthy restoration works. This may lead to severe and unexpected disruption of traffic. In this paper, a model for the assessment of the seismic resilience of a road network is presented. The proposed model permits us to evaluate the earthquake-induced perturbations to the functionality of a network in terms of transportation capacities, traffic congestion, and travel times due to bridge damages and subsequent restoration interventions. The evolution over time of the functionality of the network is studied by means of a multi-stage approach describing the evolution of the situation in terms of reducing the normal pre-earthquakes transportation capacities. The methodology has been illustrated with reference to a hypothetical case study, a road network composed of 14 nodes and 31 links.

scholarly journals Modeling of Emergency Supply Scheduling Problem Based on Reliability and Its Solution Algorithm under Variable Road Network after Sudden-Onset Disasters

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15 ◽  
Author(s):  
Tinggui Chen ◽  
Shiwen Wu ◽  
Jianjun Yang ◽  
Guodong Cong ◽  
Gongfa Li
Keyword(s):  
Road Network ◽  
Road Networks ◽  
Sudden Onset ◽  
The Road ◽  
Bee Colony ◽  
Proposed Model ◽  
Effectiveness And Efficiency ◽  
In Transit ◽  
Emergency Supply

It is common that many roads in disaster areas are damaged and obstructed after sudden-onset disasters. The phenomenon often comes with escalated traffic deterioration that raises the time and cost of emergency supply scheduling. Fortunately, repairing road network will shorten the time of in-transit distribution. In this paper, according to the characteristics of emergency supplies distribution, an emergency supply scheduling model based on multiple warehouses and stricken locations is constructed to deal with the failure of part of road networks in the early postdisaster phase. The detailed process is as follows. When part of the road networks fail, we firstly determine whether to repair the damaged road networks, and then a model of reliable emergency supply scheduling based on bi-level programming is proposed. Subsequently, an improved artificial bee colony algorithm is presented to solve the problem mentioned above. Finally, through a case study, the effectiveness and efficiency of the proposed model and algorithm are verified.

scholarly journals Research on Analysis Method of Traffic Congestion Mechanism Based on Improved Cell Transmission Model

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Hongzhao Dong ◽  
Shuai Ma ◽  
Mingfei Guo ◽  
Dongxu Liu
Keyword(s):  
Traffic Flow ◽  
Traffic Congestion ◽  
Road Network ◽  
Simulation Experiment ◽  
Transmission Model ◽  
Spatial Diffusion ◽  
Cell Transmission Model ◽  
Analysis Method ◽  
Proposed Model ◽  
Cell Transmission

To analyze the spreading regularity of the initial traffic congestion, the improved cell transmission model (CTM) is proposed to describe the evolution mechanism of traffic congestion in regional road grid. Ordinary cells and oriented cells are applied to render the crowd roads and their adjacent roads. Therefore the traffic flow could be simulated by these cells. Resorting to the proposed model, the duration of the initial traffic congestion could be predicted and the subsequent secondary congestion could be located. Accordingly, the spatial diffusion of traffic congestion could be estimated. At last, taking a road network region of Hangzhou city as an example, the simulation experiment is implemented to verify the proposed method by PARAMICS software. The result shows that the method could predict the duration of the initial congestion and estimate its spatial diffusion accurately.

scholarly journals Making Cycling Spaces in Hilly Cities

2020 ◽  
Author(s):  
Isabel Matias ◽  
Bertha Santos ◽  
Ana Virtudes
Keyword(s):  
Environmental Pollution ◽  
Traffic Congestion ◽  
Road Network ◽  
Methodological Approach ◽  
Feasibility Studies ◽  
It Use ◽  
Doctoral Research ◽  
Definition Of ◽  
Serra Da Estrela

Traffic congestion and environmental pollution in cities have stimulated the rise of policies to encourage practices of less polluting, and more economic and healthier modes of transportation, such as cycling. Several factors influence bicycle use, including the steep gradients which can limit it use, but do not completely prevent it. In this context, urban planning and transport engineering play a key role in promoting cycling, with particular emphasis on the definition and design of cycling networks at hilly cities, according to the citizens’ needs on their daily commutes. To address this challenge, this paper describes the starting developments and the methodological approach of a doctoral research having the following goals: to define the data to be considered in feasibility studies of designing cycling mode in hilly cities; to develop a bicycle suitability model based on demographic, travel-generating poles, type of bicycles (regular vs. electric) and road network criteria; to develop a model to support the definition of cycling network based on connectivity, network intersections, integration with other modes of transportation, parking and safety; and to define a procedure for assessing solutions and define cycling routes hierarchy, having as case study the hilly city of Covilhã, at Serra da Estrela mountain.

scholarly journals Forming an e-learning Proposed Model. A Case Study of Palestine

2021 ◽  
Vol 17 (2) ◽  
pp. 16-23
Author(s):  
Haitham Jouda ◽  
Maysara Abu Dan ◽  
Ahmed Awaja ◽  
Ahmad Tafish
Keyword(s):  
Learning Systems ◽  
International Standards ◽  
Learning System ◽  
Review Of Literature ◽  
Technology Infrastructure ◽  
Proposed Model ◽  
E Learning ◽  
Palestinian Universities ◽  
Over Time

Abstract Nowadays, e-learning systems play an important role in our life; they help instructors in the process of teaching and help the students and learners to access knowledge. e-learning is the concept that refers to the use of computerized and smart tools and designed systems in the learning process. Also, the interest in e-learning has started to increase dramatically, and researchers everywhere have become more interested in how to develop e-learning in all aspects. Therefore, the aim of this study is to present a model that includes the most important necessary variables required to provide and implement e-learning systems according to international standards for the students of Palestinian universities. This study undertook an in-depth review of literature concerning the success of e-learning implementation and focusing on the aspects of technology, infrastructure, scientific materials and services provided. The proposed model in this study will be the first building block that universities can focus on in designing, building and developing their own e-learning system and will be a cornerstone and the basis in the development of e-learning in Palestine over time.

An Approach to Boundary Finding of Intersection Group for Traffic Analysis due to Intersection Improvements

2015 ◽  
Vol 743 ◽  
pp. 413-421
Author(s):  
Ying Ying Ma ◽  
Ying Zeng
Keyword(s):  
Travel Time ◽  
Traffic Congestion ◽  
Road Network ◽  
Laplacian Matrix ◽  
Traffic Analysis ◽  
Saturation Degree ◽  
Correlation Degree ◽  
Two Measures ◽  
Group Boundary

Increased traffic congestion makes intersection improvements are necessary to improve the capacity and traffic running conditions. Because of the influence of a certain intersection improvements is not limit to itself, but covers the intersections around it. The approach to find the boundary of signal group for traffic analysis due to a certain intersection improvements is discussed in this paper. Firstly, two kinds of correlation degree are modeled, which are the basis of intersection grouping. Saturation degree and free flow travel time are considered in the model of correlation degree between two adjacent intersections considers, while correlation degree between any two intersections in the network is analyzed using Laplacian matrix algorithm. Secondly, the approach to find intersection group boundary is proposed. Thirdly, two measures are adopted in quantifying the results of intersection grouping: minimum average cut correlation degree and minimum traffic influence on the intersections outside of boundary. At last, the developed method is used on a city road network. The results of case study confirm the validity of the proposed approach.

scholarly journals Modeling and Analyzing Taxi Congestion Premium in Congested Cities

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Changwei Yuan ◽  
Dayong Wu ◽  
Dali Wei ◽  
Hongchao Liu
Keyword(s):  
Traffic Congestion ◽  
Supply And Demand ◽  
Price Equilibrium ◽  
Income Source ◽  
Taxi Drivers ◽  
Proposed Model ◽  
Demand Reduction ◽  
The Stability ◽  
The Impact

Traffic congestion is a significant problem in many major cities. Getting stuck in traffic, the mileage per unit time that a taxicab travels will decline significantly. Congestion premium (or so-called low-speed fare) has become an increasingly important income source for taxi drivers. However, the impact of congestion premium on the taxicab market is not widely understood yet. In particular, modeling and analyzing of the taxi fare structure with congestion premium are extremely limited. In this paper, we developed a taxi price equilibrium model, in which the adjustment mechanism of congestion premium on optimizing the taxi driver’s income, balancing the supply and demand, and eventually improving the level of service in the whole taxicab market was investigated. In the final part, we provided a case study to demonstrate the feasibility of the proposed model. The results indicated that the current taxi fare scheme in Beijing is suboptimal, since the gain from the raise of congestion premium cannot compensate for the loss from the demand reduction. Conversely, the optimal fare scheme suggested by our model can effectively reduce the excessive demand and reach the supply-demand equilibrium, while keeping the stability of the driver’s income to the maximum extent.

Impact of the urban construction solutions on the safety population

2020 ◽  
Vol 17 (2) ◽  
pp. 66-73
Author(s):  
R. D. Oktyabrskiy
Keyword(s):  
Traffic Congestion ◽  
Urban Population ◽  
Road Network ◽  
Residential Development ◽  
Emergency Situations ◽  
Urban Construction ◽  
Safety Population ◽  
Peace And War ◽  
The City

The article is devoted to the justification of the need to reduce the population density in the residential development of cities. The analysis of vulnerability of the urban population from threats of emergency situations of peace and war time, and also an assessment of provision of the city by a road network is given. Proposals have been formulated to reduce the vulnerability of the urban population in the long term and to eliminate traffic congestion and congestion — jams.

When Culturally Significant Songs are Decontextualised: The Initiation Song Somagwaza, A Case Study

2018 ◽  
Vol 28 (2) ◽  
Author(s):  
T Dowling ◽  
Somikazi Deyi ◽  
Anele Gobodwana
Keyword(s):  
Qualitative Research ◽  
Comparative Method ◽  
Popular Song ◽  
Focus Group Discussions ◽  
Group Discussions ◽  
Ritual Music ◽  
Constant Comparative Method ◽  
Small Focus ◽  
Over Time

While there have been a number of studies on the decontextualisation and secularisation of traditional ritual music in America, Taiwan and other parts of the globe, very little has been written on the processes and transformations that South Africa’s indigenous ceremonial songs go through over time. This study was prompted by the authors’ interest in, and engagement with the Xhosa initiation song Somagwaza, which has been re-imagined as a popular song, but has also purportedly found its way into other religious spaces. In this article, we attempted to investigate the extent to which the song Somagwaza is still associated with the Xhosa initiation ritual and to analyse evidence of it being decontextualised and secularised in contemporary South Africa. Our methodology included an examination of the various academic treatments of the song, an analysis of the lyrics of a popular song, bearing the same name, holding small focus group discussions, and distributing questionnaires to speakers of isiXhosa on the topic of the song. The data gathered were analysed using the constant comparative method of analysing qualitative research.

Optimales Layout einer Walderschliessung

2016 ◽  
Vol 167 (5) ◽  
pp. 294-301
Author(s):  
Leo Bont
Keyword(s):  
Road Network ◽  
Spatial Arrangement ◽  
Problem Situation ◽  
Optimal Layout ◽  
Forest Road ◽  
The Road ◽  
Network Cost ◽  
User Friendly ◽  
Short Time

Optimal layout of a forest road network The road network is the backbone of forest management. When creating or redesigning a forest road network, one important question is how to shape the layout, this means to fix the spatial arrangement and the dimensioning standard of the roads. We consider two kinds of layout problems. First, new forest road network in an area without any such development yet, and second, redesign of existing road network for actual requirements. For each problem situation, we will present a method that allows to detect automatically the optimal road and harvesting layout. The method aims to identify a road network that concurrently minimizes the harvesting cost, the road network cost (construction and maintenance) and the hauling cost over the entire life cycle. Ecological issues can be considered as well. The method will be presented and discussed with the help of two case studies. The main benefit of the application of optimization tools consists in an objective-based planning, which allows to check and compare different scenarios and objectives within a short time. The responses coming from the case study regions were highly positive: practitioners suggest to make those methods a standard practice and to further develop the prototype to a user-friendly expert software.

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