scholarly journals Uptake in on-demand ride-hailing for intracity long distance trip making during COVID-19

2021 ◽  
pp. 1-12
Author(s):  
Emmanuel Komla Junior Dzisi ◽  
Daniel Obeng-Atuah ◽  
Williams Ackaah ◽  
Adubofour Yaw Tuffour ◽  
Nimako Eric Aidoo
Keyword(s):  
Long Distance ◽  
On Demand

scholarly journals Cost-Effective Edge Server Placement in Wireless Metropolitan Area Networks

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 32 ◽  
Author(s):  
Feng Zeng ◽  
Yongzheng Ren ◽  
Xiaoheng Deng ◽  
Wenjia Li
Keyword(s):  
Metropolitan Area ◽  
Dominating Set ◽  
Cost Effective ◽  
Mobile Users ◽  
Metropolitan Area Networks ◽  
New Paradigm ◽  
Long Distance ◽  
On Demand ◽  
Wireless Metropolitan Area Networks ◽  
Definition Of

Remote clouds are gradually unable to achieve ultra-low latency to meet the requirements of mobile users because of the intolerable long distance between remote clouds and mobile users and the network congestion caused by the tremendous number of users. Mobile edge computing, a new paradigm, has been proposed to mitigate aforementioned effects. Existing studies mostly assume the edge servers have been deployed properly and they just pay attention to how to minimize the delay between edge servers and mobile users. In this paper, considering the practical environment, we investigate how to deploy edge servers effectively and economically in wireless metropolitan area networks. Thus, we address the problem of minimizing the number of edge servers while ensuring some QoS requirements. Aiming at more consistence with a generalized condition, we extend the definition of the dominating set, and transform the addressed problem into the minimum dominating set problem in graph theory. In addition, two conditions are considered for the capacities of edge servers: one is that the capacities of edge servers can be configured on demand, and the other is that all the edge servers have the same capacities. For the on-demand condition, a greedy based algorithm is proposed to find the solution, and the key idea is to iteratively choose nodes that can connect as many other nodes as possible under the delay, degree and cluster size constraints. Furthermore, a simulated annealing based approach is given for global optimization. For the second condition, a greedy based algorithm is also proposed to satisfy the capacity constraint of edge servers and minimize the number of edge servers simultaneously. The simulation results show that the proposed algorithms are feasible.

scholarly journals A Study on Data Security In Fog Computing

2018 ◽  
Vol 7 (2.19) ◽  
pp. 50
Author(s):  
P S.Apirajitha
Keyword(s):  
Cloud Computing ◽  
Internet Of Things ◽  
Data Security ◽  
Fog Computing ◽  
Daily Basis ◽  
Long Distance ◽  
Computing Power ◽  
On Demand ◽  
Iot Devices ◽  
The Cost

During the years, Cloud Computing is a popular paradigm which provide access to configurable resources on devices at any time,with on demand. Cloud Computing provides many benefits to enterprises by reducing the cost and allowing them to concentrate on their core business. Apart from this , the Development of Internet of Things came into existence, where the cloud divulge a long distance between users and its environment. Cloud Computing is also referred as heavy computing and dense form of computing power. In Spite of this  a new computing has been proposed called Fog Computing also known as Fogging, which overcomes the problem of cloud. Fog computing which majority supports the concepts of Internet of Things(IoT), where many  IoT devices are used by users on daily basis which are connected to each other. Fog Computing is also an extended version of cloud computing.  

scholarly journals GeoSocialVis: Visualizing Geosocial Academic Co-Authorship Networks by Balancing Topology- and Geography- Based Layouts

2020 ◽  
Author(s):  
David Saffo ◽  
Michail Schwab ◽  
Michelle Borkin ◽  
Cody Dunne
Keyword(s):  
Information Visualization ◽  
Social Groups ◽  
Social Aspect ◽  
Visualization Tool ◽  
Long Distance ◽  
On Demand ◽  
Publication Data ◽  
The Social ◽  
Data Source

In many domains, it is important to understand both the topology and geography of a network. E.g., for researchers it is important to understand the topics in a field, where this research is taking place, and which researchers collaborate. Geography plays a key role in collaboration as it is more feasible with physical proximity. Researchers are also likely to continue existing collaborations. The interplay between topology and geography is of particular interest. Within Institution collaborations are different in nature from far-distance collaborations, as long-distance collaborations often occur less out of convenience but for more complementary expertise. These long distance collaborations can connect otherwise separate social groups. However, existing approaches either focus on the geospatial location of researchers, or on the social aspect of collaborations alone. We present GeoSocialVis, an interactive visualization tool for scientometrics analyses with a focus on displaying the geosocial co-authorship network. GeoSocialVis uses a novel force layout that strikes a user-defined balance between showing network topology and the geographic locations of the authors. Users can explore relevant publications, researchers, groups, and institutions by adjusting the balance between topology and geography, searching by keywords, and with details-on-demand. We demonstrate the utility of GeoSocialVis with a case study with IEEE Information Visualization 2008–2018 publication data. Source code and an interactive demo are available online at dsaffo.github.io/GeoSocialVis

scholarly journals INFO-U FAXBACK: DELIVERING CONSUMER INFORMATION WITH FAX-ON-DEMAND TECHNOLOGY

HortScience ◽  
1996 ◽  
Vol 31 (5) ◽  
pp. 742c-742
Author(s):  
David E. Whiting
Keyword(s):  
Consumer Information ◽  
Demand System ◽  
Extension Service ◽  
Storage Space ◽  
Staff Time ◽  
Long Distance ◽  
Hard Drive ◽  
On Demand ◽  
Time Investment ◽  
Yard Care

Consumers applaud the Minnesota Extension Service, INFO-U FAXBACK system that delivers consumer horticulture publications 24 hours a day, 7 days a week. Consumers call the fax-on-demand system and, following voice instructions, use the phone key pad to enter their fax number and select a publication or a catalog of over 300 yard care and gardening titles. Documents selected are transmitted immediately to the fax number entered. Delivery cost runs $0.18 per document in the metro toll-free calling area, and $1.64 for long-distance calls. Compared to $2.75 for printing, postage, and handling per fact sheet sent by mail, the system saved $7000 in 1995 transmitting 2722 publications. Investment in system hardware and software runs $6000 to $8000. Documents can be stored as DOS text, which eliminates artwork and formatting, or scanned as graphic files that require 40 times more hard drive storage space. A document requires a one-time investment in staff time of 10–60 minutes to reformat for the fax-on-demand protocol.

scholarly journals Design and Simulation of a Digital Twin Mobility Concept: An Electric Aviation System Dynamics Case Study with Capacity Constraints

2022 ◽  
Vol 12 (2) ◽  
pp. 848
Author(s):  
Philipp Winkler ◽  
Sergio Gallego-García ◽  
Marcel Groten
Keyword(s):  
System Dynamics ◽  
Capacity Constraints ◽  
Dynamics Simulation ◽  
Long Distance ◽  
Sustainable Operations ◽  
Digital Twin ◽  
On Demand ◽  
Customer Order ◽  
Vertical Mobility

Vertical mobility, as a commercial service, has been strongly focused on the scheduled volume and long-distance mobility services. Thus, limiting its potential coverage, flexibility, and adaptability with high investments and centralized mobility hubs, called airports. In this context, a customized and on-demand air mobility concept providing high flexibility in location combinations and time schedules appears as an unexplored challenge for regional mobility needs. As a result, the aim of this research is to provide a generic framework for various mobility means as well as to design a holistic air mobility management concept for electric vertical mobility for profitable and sustainable operations by providing a service to society. A system dynamics simulation case study applies the conceptual model for an on-demand air mobility network of electric aircrafts in a regional area considering capacity constraints in vertiports, aircrafts, charging, and parking stations. Thus, bottlenecks and delays can be quantified by using a digital twin tool for customized scenarios. Simulation results show how an optimal maintenance management and redistribution of aircraft units improve service indicators in passenger quantity and customer order lead time as well as reduce aircraft on ground time. As a result, a digital twin air mobility network model with simulation capabilities is a key factor for successful operations.

scholarly journals Quality-on-Demand Compression of EEG Signals for Telemedicine Applications Using Neural Network Predictors

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
N. Sriraam
Keyword(s):  
Neural Network ◽  
Single Layer ◽  
Clinical Information ◽  
Eeg Signals ◽  
Neural Network Models ◽  
Compression Scheme ◽  
Long Distance ◽  
Telemedicine System ◽  
On Demand ◽  
Reconstructed Signal

A telemedicine system using communication and information technology to deliver medical signals such as ECG, EEG for long distance medical services has become reality. In either the urgent treatment or ordinary healthcare, it is necessary to compress these signals for the efficient use of bandwidth. This paper discusses a quality on demand compression of EEG signals using neural network predictors for telemedicine applications. The objective is to obtain a greater compression gains at a low bit rate while preserving the clinical information content. A two-stage compression scheme with a predictor and an entropy encoder is used. The residue signals obtained after prediction is first thresholded using various levels of thresholds and are further quantized and then encoded using an arithmetic encoder. Three neural network models, single-layer and multi-layer perceptrons and Elman network are used and the results are compared with linear predictors such as FIR filters and AR modeling. The fidelity of the reconstructed EEG signal is assessed quantitatively using parameters such as PRD, SNR, cross correlation and power spectral density. It is found from the results that the quality of the reconstructed signal is preserved at a low PRD thereby yielding better compression results compared to results obtained using lossless scheme.

The Fine Structure of Phloem Cells

1985 ◽  
Vol 43 ◽  
pp. 632-635
Author(s):  
James Cronshaw
Keyword(s):  
Structural Studies ◽  
High Concentration ◽  
Long Distance ◽  
Phloem Tissue ◽  
Sieve Elements ◽  
Long Distance Transport ◽  
P Protein ◽  
Companion Cells ◽  
Electron Microscopical ◽  
Distance Transport

Long distance transport in plants takes place in phloem tissue which has characteristic cells, the sieve elements. At maturity these cells have sieve areas in their end walls with specialized perforations. They are associated with companion cells, parenchyma cells, and in some species, with transfer cells. The protoplast of the functioning sieve element contains a high concentration of sugar, and consequently a high hydrostatic pressure, which makes it extremely difficult to fix mature sieve elements for electron microscopical observation without the formation of surge artifacts. Despite many structural studies which have attempted to prevent surge artifacts, several features of mature sieve elements, such as the distribution of P-protein and the nature of the contents of the sieve area pores, remain controversial.

Popliteal entrapment syndrome and age

VASA ◽  
2012 ◽  
Vol 41 (4) ◽  
pp. 262-268 ◽  
Author(s):  
Schweizer ◽  
Hügli ◽  
Koella ◽  
Jeanneret
Keyword(s):  
Risk Factors ◽  
Leg Pain ◽  
Walking Distance ◽  
Therapeutic Approaches ◽  
Long Distance ◽  
Entrapment Syndrome ◽  
Long Distance Running ◽  
Popliteal Entrapment ◽  
Popliteal Entrapment Syndrome ◽  
Atherosclerotic Risk Factors

On the occasion of diagnosing a popliteal entrapment syndrome in a 59-year old man with no cardiovascular risk factors, who developed acute ischemic leg pain during long distance running, we give an overview on this entity with emphasis on patients’age. The different types of the popliteal artery compression syndrome are summarized. The diagnostic and therapeutic approaches are discussed. The most important clinical sign of a popliteal entrapment syndrome is the lack of atherosclerotic risk factors in patients with limited walking distance. Not only in young athletes but also in patients more than 50 years old the popliteal entrapment syndrome has to be taken into account.

Attachment Styles, Physical Proximity, and Relational Satisfaction

2014 ◽  
Vol 4 (2) ◽  
pp. 106-112
Author(s):  
Anita Shrivastava ◽  
Andrea Burianova
Keyword(s):  
Attachment Styles ◽  
Romantic Relationship ◽  
Distinct Type ◽  
Relational Satisfaction ◽  
Long Distance ◽  
Avoidant Attachment ◽  
Geographic Separation ◽  
Relationship Of ◽  
Attachment Dimensions

This study aimed to explore the relationships between attachment styles, proximity, and relational satisfaction. This was achieved by assessing a distinct type of long distance romantic relationship of flying crews, compared with proximal (non-flying crew) romantic relationships. The responses of 139 expatriate professionals revealed significant associations between proximity and anxious and avoidant attachment dimensions. The role of the avoidant dimension in comparison with that of the anxious dimension was found to be a significant predictor of relational satisfaction. This study contributes significantly toward addressing the role of proximity and attachment in relational satisfaction in a new context of geographic separation.

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