scholarly journals Vehicular Channel Characterization in Urban Environment at 30 GHz considering Overtaking and Traffic Flow

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yanzi Chen ◽  
Lei Ma ◽  
Xinjian Ou ◽  
Jingjing Liao

To realize reliable and stable millimeter-wave (mmWave) vehicular wireless communication, the research of vehicular channel characteristics in the dense urban environment is becoming increasingly important. A comprehensive research on the channel characteristics for 30 GHz vehicular communication in the Beijing Central Business District (CBD) scenario is conducted in this paper. The self-developed high-performance ray-tracing (RT) simulator is employed to support intensive simulations. Based on simulation results, the effects of multiantenna and beam switching on the key channel parameters are analyzed, as well as the impact of different traffic flows. The results can provide theoretical and data support for the evaluation of vehicular channel characteristics and will help for the design of the vehicular communication system enabling future intelligent transportation.

2020 ◽  
Vol 18 (5) ◽  
pp. 1305-1319
Author(s):  
Daniel Alejandro Chaparro ◽  
Fei J. Ying ◽  
Funmilayo Ebun Rotimi ◽  
Temitope Egbelakin

Purpose This paper aims to identify the impact that commute patterns pose on construction labour productivity (CLP). There is limited research focussed on the impact of workforce transportation on productivity, even fewer in a construction environment. In particular, this study seeks to fill a gap in the understanding of how commute patterns may influence CLP. Design/methodology/approach Key factors reported affecting CLP were identified through a comprehensive literature review. Data were collected from 27 interviews and observational evidence at construction sites on Auckland Central Business District (CBD). Findings Shortage of skills, communication among workers, shirking behaviour, absenteeism and tardiness were perceived as the most critical labour productivity factors that are influenced by commute patterns. It is considered that stressful commutes may lead to shirking behaviours (absenteeism and calling sick). Meanwhile, ridesharing may encourage communication among workers. Research limitations/implications The study was carried out in a central business district, focussing on a geographic area with its particular characteristics. The results, thus, may not be generalised in general urban settings. Originality/value The research outcomes can be used as guidelines for companies considering travel plans for their employees, to minimise the negative impact commuting can have on workers, especially in industries with low productivity.


2021 ◽  
Author(s):  
◽  
Kate Whitwell

<p>Tackling the challenge of climate change will require rapid emissions reductions across all sectors, including transport. This study adds to the literature by investigating factors that may encourage sustainable transport choices at a time of change and therefore reduce emissions. A mix of quantitative and qualitative methods was used to explore the impact of a relocation of employees from several dispersed work locations back to one office building in the central business district on transport choices and carbon emissions in Christchurch, New Zealand.  This case study found that such a recentralisation of employment can result in employees making more sustainable transport choices and can contribute to decreases in transport emissions from commuting, even in a highly car-dependent city. The relocation led to a 12 percent rise in the proportion of employees commuting actively or by public transport and resulted in a significant drop in commuting emissions (16 percent). The primary contributing factor was the change in location of the office itself, reducing the average commuting distance and increasing accessibility to public transport and active travel. A further contributing factor was the perceived reduction in parking availability at the new location. Further results support the existing literature on barriers to sustainable transport, identifying any factor that impacts on the feasibility of the journey by alternative modes, such as commute time or safety, as a significant barrier to uptake. Overall findings suggest that relocating offices provides a good opportunity to encourage employees to consider changing to a more sustainable commute mode, and that significant numbers may make such a shift if commute time or distance are reduced. Realising substantial mode shift however will depend on cities providing feasible and efficient sustainable alternatives to driving a car to work.</p>


2020 ◽  
Vol 12 (14) ◽  
pp. 5596 ◽  
Author(s):  
Yanmin Qi ◽  
Zuduo Zheng ◽  
Dongyao Jia

The impact of inclement weather on traffic flow has been extensively studied in the literature. However, little research has unveiled how local weather conditions affect real-time traffic flows both spatially and temporally. By analysing the real-time traffic flow data of Traffic Signal Controllers (TSCs) and weather information in Brisbane, Australia, this paper aims to explore weather’s impact on traffic flow, more specifically, rainfall’s impact on traffic flow. A suite of analytic methods has been applied, including the space-time cube, time-series clustering, and regression models at three different levels (i.e., comprehensive, location-specific, and aggregate). Our results reveal that rainfall would induce a change of the traffic flow temporally (on weekdays, Saturday, and Sunday and at various periods on each day) and spatially (in the transportation network). Particularly, our results consistently show that the traffic flow would increase on wet days, especially on weekdays, and that the urban inner space, such as the central business district (CBD), is more likely to be impacted by inclement weather compared with other suburbs. Such results could be used by traffic operators to better manage traffic in response to rainfall. The findings could also help transport planners and policy analysts to identify the key transport corridors that are most susceptible to traffic shifts in different weather conditions and establish more weather-resilient transport infrastructures accordingly.


Author(s):  
Gary Santoso

Urban density not only affects city development but can also affect the routine of the people. Departing from this routine, a feeling of saturation and stress arises, so a break is needed. The interlude in question can be in the form of recreational facilities to get out of the hustle and bustle of urban dense. Productive groups are the most vulnerable groups experiencing saturation and stress. The space between the dense urban environment that can function as a recreational facility in an open space, which can also function as a social space in a dense urban environment, contains activities that are healthy not only physically but also mentally which are expected to help reduce stress levels. South Kembangan is one of the areas that have the highest density level in Jakarta because it is a western primary center area which means the South Kembangan area will become a center of activity, especially in the West Jakarta Region. Based on these problems, Kembangan Interactive Breathing Space is proposed with the main entertainment program which is divided into two facilities namely recreation and relaxation in response to the impact of stress generated from community routines. Recreational facilities are divided into three zones namely perform, playful and creative play zones in the form of plazas and playground areas while relaxation facilities in the form of zones containing activities to escape mental and physical fatigue such as yoga, meditation, and fitness facilities in the form of gyms and sports fields. Abstrak Kepadatan perkotaan tidak hanya mempengaruhi perkembangan kota saja tapi dapat berdampak juga pada rutinitas masyarakatnya. Berangkat dari rutinitas inilah kemudian muncul perasaan jenuh dan stres sehingga diperlukan adanya jeda. Jeda yang dimaksud dapat berupa sarana rekreasi untuk keluar dari hiruk pikuk padatnya perkotaan. Masyarakat golongan produktif menjadi golongan yang paling rentan mengalami jenuh dan stres. Ruang jeda diantara padatnya lingkungan perkotaan yang dapat berfungsi sebagai sarana rekreasi yang berada di ruang terbuka, yang juga dapat berfungsi sebagai ruang sosial ditengah padatnya lingkungan perkotaan, berisi kegiatan – kegiatan yang menyehatkan tidak hanya fisik tapi juga secara mental yang diharapkan mampu membantu mengurangi tingkat stress. Kembangan selatan merupakan salah satu wilayah yang memilki tingkat kepadatan yang paling tinggi di Jakarta karena merupakan wilayah sentra primer barat yang artinya wilayah Kembangan Selatan akan menjadi pusat aktivitas terutama di Kawasan Jakarta Barat. Berdasarkan permasalahan tersebut diusulkanlah Ruang Jeda Interaktif Kembangan dengan program utama entertainment yang dibagi menjadi dua fasilitas yaitu rekreasi dan relaksasi sebagai respon terhadap dampak stress yang dihasilkan dari rutinitas masyarakat. Fasilitas rekreasi terbagi menjadi tiga zona yaitu zona perform, playful dan creative play berupa plaza dan area playground  sedangkan fasilitas relaksasi berupa zona yang berisi kegiatan untuk melepaskan diri dari kelelahan mental dan fisik seperti yoga,  meditasi dan fasilitas kebugaran berupa gym dan lapangan olahraga.


2016 ◽  
Vol 1 (1) ◽  
pp. 113
Author(s):  
Christopher James Cox ◽  
Mirko Guaralda

It could be argued that architecture has an inherent social responsibility to enrich the urban and spatial environments for the city’s occupants. However, how we define quality, and how ‘places’ can be designed to be fair and equitable, catering for individuals on a humanistic and psychological level, is often not clearly addressed. Lefebvre discusses the idea of the ‘right to the city’; the belief that public space design should facilitate freedom of expression and incite a sense of spatial ownership for its occupants in public/commercial precincts. Lefebvre also points out the importance of sensory experience in the urban environment. “Street-scape theatrics” are performative activities that summarise these two concepts, advocating the ‘right to the city’ by way of art as well as providing sensual engagement for city users. Literature discusses the importance of Street-scape Theatrics however few sources attempt to discuss this topic in terms of how to design these spaces/places to enhance the city on both a sensory and political level. This research, grounded in political theory, investigates the case of street music, in particular busking, in the city of Brisbane, Australia. Street culture is a notion that already exists in Brisbane, but it is heavily controlled especially in central locations. This study discusses how sensory experience of the urban environment in Brisbane can be enriched through the design for busking; multiple case studies, interviews, observations and thematic mappings provide data to gather an understanding of how street performers see and understand the built form. Results are sometime surprisingly incongruous with general assumptions in regards to street artist as well as the established political and ideological framework, supporting the idea that the best and most effective way of urban hacking is working within the system. Ultimately, it was found that the Central Business District in Brisbane, Australia, could adopt certain political and design tactics which attempt to reconcile systematic quality control with freedom of expression into the public/commercial sphere, realism upheld. This can bridge the gap between the micro scale of the body and the macro of the political economy through freedom of expression, thus celebrating the idiosyncratic nature of the city.


2019 ◽  
Vol 9 (6) ◽  
pp. 64 ◽  
Author(s):  
Kwaku Oppong Asante

Several studies conducted on street youth have focused on causes of homelessness, their engagement in risky sexual behaviours and the prevalence of STIs, including HIV/AIDS. Although homeless youth are considered resilient, sparse literature exists on factors that promote resilience in this vulnerable group. Using a qualitative approach, semi-structured interviews were conducted with 16 purposively selected homeless children and youth (with a mean age of 14 years) from the Central Business District of Accra, Ghana. Thematic analysis was used to analyse the data. Findings showed that a strong religious belief, sense of humour, engagement in meaningful social interactive activities, reciprocal friendship, adherence to cultural norms and support from community-based organizations were identified as factors that help homeless youth cope with the multiple challenges of street life. Strengthening such protective factors could help ameliorate the impact of adverse conditions of these street youth.


Author(s):  
Yuchu Qin ◽  
Yunchao Wu ◽  
Bin Li ◽  
Shuai Gao ◽  
Miao Liu ◽  
...  

This paper presents a novel approach for semantic segmentation of building roof in dense urban environment with Deep Convolution Neural Network (DCNN) using imagery acquired by a Chinese Very High Resolution (VHR) satellite mission, i.e. GaoFen-2 (GF-2). To provide an operational end-to-end work flow for accurate build roof mapping with feature extraction as well as image segmentation, a fully convolutional DCNN with both convolutional and deconvolutional layers is designed to perform the VHR image analysis for labeling pixels. Since the diverse urban patterns and building styles in large areas, sample image data sets of building roof and non-building roof are collected over different metropolitan regions in China. We selected typical cities with dense urban environment in each metropolitan region as study areas for collecting training and test samples. High performance cluster with GPU-mounted workstations is employed to perform the model training and optimization. With the building roof samples collected over different cities, the predictive model with multiple NN layers is developed for building roof labeling. The validation of the building roof map shows that the overall accuracy(OA) and the mean Intersection Over Union( mIOU) of DCNN based segmentation are 94.67%, 0.85 respectively, while CRF-refined segmentation achieved OA of 94.69% and mIOU of 0.83. The results suggest that the proposed approach is a promising solution for building roof mapping with VHR images over large areas across different urban and building patterns. With the operational acquisition of GF2 VHR imagery, it is expected to develop an automated pipeline for operational built-up area monitoring and timely update of building roof map over large areas.


2021 ◽  
Vol 51 (51) ◽  
pp. 95-107
Author(s):  
Jorge Alberto Montoya ◽  
Juan Camilo Aguilera ◽  
Diego Alexander Escobar

Abstract Due to the increased tendency to use private transport in urban areas of Manizales and Villamaría municipalities, it is intended to include alternative modes of transport that are more time-efficient and environmentally sustainable to improve the inhabitants’ quality of life. This article aims to analyse the inclusion impact of a sustainable public transport system, such as a new cableway line in the city connecting the Central Business District (CBD) with Ciudadela del Norte district, measuring overall average accessibility for the current and future scenario. This establishes the average travel time and the savings in terms of time shown as a percentage that these modes of transport would create in the population displacement and also which inhabitants are the most likely to benefit.


2016 ◽  
Vol 53 (2) ◽  
pp. 236-272 ◽  
Author(s):  
Jeffrey M. Timberlake ◽  
Elaina Johns-Wolfe

This research examines the impact of neighborhood ethnoracial composition on the likelihood that neighborhoods that could gentrify do gentrify over time. Drawing on findings from the gentrification and residential preference literatures, we hypothesize that the percentage of Black and Latino residents in neighborhoods in 1980 is associated with the probability of gentrification, conditional on the racial composition of neighborhoods in 2010. We test these hypotheses with analyses of census data for tracts in the central cities of Chicago and New York in 1980 to 2010. We find that the percentage of Black residents in 1980 was negatively associated with gentrified White and positively associated with gentrified Black neighborhoods, and that percent Latino in 1980 was positively associated with gentrified Latino neighborhoods. Finally, we found strong evidence that gentrification in these cities was much more likely to occur in neighborhoods close to the central business district.


2017 ◽  
Vol 11 (1) ◽  
pp. 102-109 ◽  
Author(s):  
Adeyinka Peter Ajayi

Background:This paper filled an important gap in the on-going global assessment of Bus Rapid Transit (BRT) operations on Road Traffic Crashes (RTC) safety outcomes on corridors plied.Introduction:The work carried out a scientific investigation of the impact of Lagos BRT-Lite(Africa’s first and only BRT scheme) on the achievement of a possible reduction in the incidences of RTC on the 22-kilometer radial highway that connects Mile12 and Lagos Island the traditional central business district.Methodology:Secondary data on the incidences of RTC on the corridor between 2002 and 2013 were obtained from Nigeria Police. One-way Analysis of variance between subjects revealed that the advent of BRT operations on the corridor do not have any significant effect in the reported cases of the three categories of RTC examined. Minor (p=. 783), Serious (p= .887) and Fatal (p= .826).Data Analysis:Descriptive statistics, however, showed that there has been a general reduction in the incidences of all categories of RTC considered in the period after the commencement of BRT on the corridor.Conclusion:The paper concludes by positing that while it might be far-fetched to imply a direct causal relationship between the introduction of BRT and reduction in the cases of RTC on the corridor, it may not be far to suggest that it has definitely impacted safety outcomes as it relates to RTC.


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