Connectivity, Accessibility, and Mobility Relationships in the Context of Low-Volume Road Networks

2019 ◽  
Vol 2673 (12) ◽  
pp. 717-727
Author(s):  
Samuel Labi ◽  
Asif Faiz ◽  
Tariq Usman Saeed ◽  
Bortiorkor Nii Tsui Alabi ◽  
Wubeshet Woldemariam
Keyword(s):  
Network Topology ◽  
Network Performance ◽  
Holistic Approach ◽  
Operational Performance ◽  
Socioeconomic Characteristics ◽  
Project Appraisal ◽  
Road Condition ◽  
Road Projects ◽  
Low Volume ◽  
Area Of Influence

The concepts of connectivity, accessibility, and mobility (CAM) are key measures of transport network performance that have been discussed extensively in the literature. However, there has been little work that discussed the relationships among these concepts. A clear discourse on these concepts and their interrelationships can help agencies carry out more objective evaluations of projects that seek to improve at least one of these measures of transportation performance. This paper presents three alternative perspectives (models) of the CAM relationship: the nested, snowman, and three-way overlapping models. The paper also presents, for project appraisal purposes, two alternative ways of classifying the three CAM concepts. The first is based on the three concepts in their basic forms; the second considers some variation of these concepts in addition to aspects of the network topology, operational performance, road condition, and socioeconomic characteristics of the project’s area of influence. The conceptual framework outlined in this paper contributes towards a holistic approach to the appraisal of low-volume road projects, programs, or existing networks based on their impact on overall CAM.

scholarly journals Feature Extraction of Real-World Traces Using K Means Clustering In OppNet

2021 ◽  
Author(s):  
Rahul Johari ◽  
Tanvi Gautam
Keyword(s):  
Network Topology ◽  
Real World ◽  
Network Performance ◽  
Performance Metrics ◽  
Learning Algorithm ◽  
Dynamic Network ◽  
Delivery Ratio ◽  
Communication Link ◽  
Alternative Measure ◽  
Intermittent Connectivity

Abstract Natural calamities leave people helpless by arising several situations such as network breakdown, zero communication, intermittent connectivity, dynamic network topology. In such situation an application of dynamic and intermittent routing scheme is essential to make further communication possible during likewise scenarios. An application of TCP/IP becomes futile in mentioned circumstances as it best works for static nodes and pre-defined network topology wherein source and destination nodes are first establishing the communication link with each other. An alternative measure of such hitches is to encounter an application of DTN protocol which possess all characteristics to withstand in such scenarios such as; dynamic network topology, intermittent connectivity, frequent path breaks, store – carry – forward fashion. In this paper we did thorough investigation of forest fire dataset (Uttarakhand) after exploring its implementation in ONE with Epidemic, Prophet, Spray and Wait, HBPR, GAER respectively. An extensive and thorough investigation for real world traces implementation has been done with OppNet routing protocols against mobility models namely; Shortest path map – based, Random Direction, Random Walk, Random Waypoint, Cluster Movement respectively for network performance metrics namely packet delivery ratio, packet overhead ratio and average latency ratio respectively with the application of K means clustering machine learning algorithm. With the help of this analysis, we explore the real-world traces characteristics and study the areas on which network performance can be improved.

scholarly journals SDN-based Handover Scheme in Cellular/IEEE 802.11p Hybrid Vehicular Networks

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1082 ◽  
Author(s):  
Ran Duo ◽  
Celimuge Wu ◽  
Tsutomu Yoshinaga ◽  
Jiefang Zhang ◽  
Yusheng Ji
Keyword(s):  
Network Topology ◽  
Network Performance ◽  
Vehicular Networks ◽  
Ieee 802.11P ◽  
Centralized Control ◽  
Topology Changes ◽  
Dynamic Topology ◽  
Stable Transmission ◽  
Transmission Layer ◽  
Handover Scheme

With the arrival of 5G, the wireless network will be provided with abundant spectrum resources, massive data transmissions and low latency communications, which makes Vehicle-to-Everything applications possible. However, VANETs always accompany with frequent network topology changes due to the highly mobile feature of vehicles. As a result, the network performance will be affected by the frequent handover. In this paper, a seamless handover scheme is proposed where the Software-Defined Networking (SDN) and Mobile Edge Computing (MEC) technologies are employed to adapt to the dynamic topology change in VANETs. The introduction of SDN provides a global view of network topology and centralized control, which enables a stable transmission layer connection when a handover takes place, so that the upper layer performance is not influenced by the network changes. By employing MEC server, the data are cached in advance before a handover happens, so that the vehicle can restore normal communication faster. In order to confirm the superiority of our proposal, computer simulations are conducted from different aspects. The results show that our proposal can significantly improve the network performance when a handover happens.

Research on the Network Topology and Reliability of the Communication System in Smart Substations

2013 ◽  
Vol 765-767 ◽  
pp. 1757-1760
Author(s):  
Zhi Ming Wang ◽  
Xian Li Sun ◽  
Li Liu ◽  
Xiao Rui Zhang
Keyword(s):  
Network Topology ◽  
Network Performance ◽  
Vital Role ◽  
Network System ◽  
Entire System ◽  
Advantages And Disadvantages ◽  
Network Topologies ◽  
The Relationship ◽  
Smart Substation

Communication network plays a vital role in smart substations. Different network topology provides different network performance, while the quality of network performance directly impacts the reliability of the entire system. In view of the network topology of smart substations, this paper compares the advantages and disadvantages of different network topologies as well as different network schemes of substation layer and process layer, and also analyzes the relationship between the reliability of network system and network topology, which play an important role in establishing a reliable and efficient smart substation system.

scholarly journals Prioritization of Low-Volume Road Projects Considering Project Cost and Network Accessibility: An Incremental Benefit–Cost Analysis Framework

2021 ◽  
Vol 13 (23) ◽  
pp. 13434
Author(s):  
Wubeshet Woldemariam
Keyword(s):  
Cost Analysis ◽  
Decision Makers ◽  
Performance Criteria ◽  
Project Cost ◽  
Benefit Cost Analysis ◽  
Incremental Benefit ◽  
Study Results ◽  
Road Projects ◽  
Low Volume ◽  
Benefit Cost

Due to insufficient funds to implement all candidate road infrastructure projects, there is a need to efficiently utilize available funds and select candidate projects that maximize performance criteria decision-makers. This paper proposes an incremental benefit–cost analysis (IBCA) framework to prioritize low-volume road (LVR) projects that maximize road network accessibility considering project cost and network accessibility requirements. The study results show that the accessibility benefits of road projects depend not only on their cost requirements but also on their spatial locations in the network that affect their network-level accessibility benefits per unit cost of investment. Additionally, the number of disrupted LVR links cannot fully determine the degree of change in network accessibility. The framework enables decision-makers to consider project cost requirements and the accessibility-related impacts of LVR projects, maximize economic benefits, and ensure the sustainability of the LVR network performance.

scholarly journals MONALISA: A MONITORING FRAMEWORK FOR LARGE SCALE COMPUTING SYSTEMS

2014 ◽  
pp. 351-366
Author(s):  
Ciprian Dobre ◽  
Ramiro Voicu ◽  
Iosif C. Legrand
Keyword(s):  
Global Optimization ◽  
Real Time ◽  
Network Topology ◽  
Large Scale ◽  
Network Performance ◽  
Distributed Resources ◽  
Wide Range ◽  
Global Topology ◽  
Monitoring Framework ◽  
Resource Accounting

The MonALISA (Monitoring Agents in A Large Integrated Services Architecture) framework provides a set of distributed services for monitoring, control, management and global optimization for large scale distributed systems. It is based on an ensemble of autonomous, multi-threaded, agent-based subsystems which are registered as dynamic services. They can be automatically discovered and used by other services or clients. The distributed agents can collaborate and cooperate in performing a wide range of management, control and global optimization tasks (such as network monitoring, resource accounting) using real time monitoring information. MonALISA includes a coherent set of network management services to collect in near real-time information about the network topology, the main data flows, traffic volume and the quality of connectivity. A set of dedicated modules were developed in the MonALISA framework to periodically perform network measurements tests between all sites. We developed global services to present in near real-time the entire network topology used by a community. The time evolution of global network topology is shown in a dedicated GUI. Changes in the global topology at this level occur quite frequently and even small modifications in the connectivity map may significantly affect the network performance. The global topology graphs are correlated with active end-to-end network performance measurements, done using the Fast Data Transfer application, between all sites. Access to both real-time and historical data, as provided by MonALISA, is also important for developing services able to predict the usage pattern, to aid in efficiently allocating resources globally. For resource accounting, MonALISA collects information regarding the amounts of resources consumed by the users, which represent virtual organizations in a large scale distributed system. Besides providing statistical information, an accounting system can also be the base for managing distributed resources upon an economic model. In the MonALISA monitoring framework we developed modules that provide accounting facilities, collecting information from cluster managers like Condor, PBS, LSF and SGE. The usage statistic s is used for an intelligent management of the resources.

scholarly journals Road Landscape Morphology of Valley City Blocks under the Concept of “Open Block”—Taking Lanzhou City as an Example

2019 ◽  
Vol 11 (22) ◽  
pp. 6258
Author(s):  
Zeng ◽  
Qian ◽  
Ren ◽  
Xu ◽  
Wei
Keyword(s):  
Network Topology ◽  
Road Network ◽  
Network Performance ◽  
Statistical Characteristics ◽  
Small Scale ◽  
Lanzhou City ◽  
Geographical Environment ◽  
Landscape Morphology ◽  
Positive Effect ◽  
Valley City

The unique valley geographical environment and the congestion-prone road landscape make valley city traffic jammed easily. In this paper, under the background of “open blocks”, two open patterns, which correspond to two different road landscapes ("ideal grid opening" and "open under realistic conditions"), are proposed. Taking Lanzhou city as an example, six basic statistical characteristics are used to compare and analyze the changes of road network topology in blocks to find out which open pattern is more suitable for valley cities. The results show that the pattern "open under realistic conditions" has a significant effect on the improvement of network performance and capacity. Specifically, breaking the "large blocks" and developing the small-scale blocks help to alleviate the traffic pressure. Besides, the opening of blocks located along river valley has a more positive effect on improving road network performance than the blocks sited in the inner area of cities.

ENHANCING NETWORK PERFORMANCE BY EDGE ADDITION

2011 ◽  
Vol 22 (11) ◽  
pp. 1211-1226 ◽  
Author(s):  
ZHONGYUAN JIANG ◽  
MANGUI LIANG ◽  
DONGCHAO GUO
Keyword(s):  
Network Topology ◽  
Degree Distribution ◽  
Path Length ◽  
Network Performance ◽  
Service Providers ◽  
Network Planning ◽  
Transmission Efficiency ◽  
Average Path Length ◽  
Edge Addition

Transmission efficiency and robustness are two important properties of various networks and a number of optimization strategies have been proposed recently. We propose a scheme to enhance the network performance by adding a small fraction of links (or edges) to the currently existing network topology, and we present four edge addition strategies for adding edges efficiently. We aim at minimizing the maximum node betweenness of any node in the network to improve its transmission efficiency, and a number of experiments on both Barabási–Albert (BA) and Erdös–Rényi (ER) networks have confirmed the effectiveness of our four edge addition strategies. Also, we evaluate the effect of some other measure metrics such as average path length, average betweenness, robustness, and degree distribution. Our work is very valuable and helpful for service providers to optimize their network performance by adding a small fraction of edges or to make good network planning on the existing network topology incrementally.

scholarly journals A Network Topology Control Algorithm Based on Mobile Nodes

2016 ◽  
Vol 12 (10) ◽  
pp. 76
Author(s):  
Huarui Wu ◽  
Li Zhu
Keyword(s):  
Energy Consumption ◽  
Network Topology ◽  
Topology Control ◽  
Control Algorithm ◽  
Network Performance ◽  
Network Connectivity ◽  
Node Degree ◽  
Mobile Nodes ◽  
Network Nodes ◽  
Local Topology

<p style="margin: 0in 0in 10pt;"><span style="font-family: Times New Roman; font-size: small;">Topology control is of great significance to reduce energy consumption of wireless sensor network nodes and prolong network lifetime. Different tasks taken by nodes may lead to node failures and fractures of data transmission links, hence undermining the overall network performance. In response to such problems, this paper presents a network topology control algorithm based on mobile nodes that fully considers node energy, node degree and network connectivity. Furthermore, a topology control model is established to analyze weak network topology areas and carry out local topology refactoring. Finally, a simulation experiment demonstrates that the presented algorithm is advantageous in balanced network energy consumption and network connectivity.</span></p>

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