scholarly journals Design of a Traffic-Aware Governor for Green Routers

2014 ◽  
Vol 2014 ◽  
pp. 1-12
Author(s):  
Alfio Lombardo ◽  
Vincenzo Riccobene ◽  
Giovanni Schembra
Keyword(s):  
Quality Of Service ◽  
Energy Consumption ◽  
Energy Saving ◽  
Analytical Model ◽  
Case Scenario ◽  
Proposed Model ◽  
Traffic Impacts ◽  
Reduction Of Energy Consumption

Today the reduction of energy consumption in telecommunications networks is one of the main goals to be pursued by manufacturers and researchers. In this context, the paper focuses on routers that achieve energy saving by applying the frequency scaling approach. The target is to propose an analytical model to support designers in choosing the main configuration parameters of the Router Governor in order to meet Quality of Service (QoS) requirements while maximizing energy saving gain. More specifically, the model is used to evaluate the input traffic impacts on the choice of the active router clock frequencies and on the overall green router performance. A case study based on the open NetFPGA reference router is considered to show how the proposed model can be easily applied to a real case scenario.

A Case Study on the QoS, Energy Consumption and Mobility of WLANs and WMANs

2009 ◽  
pp. 175-196
Author(s):  
Ioannis Papapanagiotou ◽  
Georgios S. Paschos
Keyword(s):  
Quality Of Service ◽  
Energy Consumption ◽  
Life Time ◽  
Wireless Access ◽  
Next Generation Networks ◽  
Telecommunication Services ◽  
Wireless Architectures ◽  
Important Design

The present chapter contains a thorough investigation of Quality of Service, Energy Conservation and mobility in 802.11 and 802.16 standards. Interest on these two technologies arises from the fact that they are designed to cooperate offering wireless access capabilities in Next Generation Networks (NGNs). Under NGN Wireless architectures, key challenges must be taken into account: (a) Broadband technologies are based on QoS Enabled Telecommunication Services; (b) Mobile devices are battery limited. In fact, how to prolong the life time of a mobile device and minimize power usage is a very important design issue; (c) Wireless operation means that the user is expected to roam freely, which must also be taken into account. The dependability of NGN operation is obviously depended on these three features.

scholarly journals Integrated Optimization on Energy Saving and Quality of Service of Urban Rail Transit System

2020 ◽  
Vol 2020 ◽  
pp. 1-22 ◽  
Author(s):  
Wenxin Li ◽  
Qiyuan Peng ◽  
Chao Wen ◽  
Shengdong Li ◽  
Xu Yan ◽  
...  
Keyword(s):  
Quality Of Service ◽  
Energy Consumption ◽  
Total Energy ◽  
Energy Saving ◽  
Urban Rail Transit ◽  
Total Energy Consumption ◽  
Transit System ◽  
Running Time ◽  
Urban Rail

Optimizing to increase the utilization ratio of regenerative braking energy reduces energy consumption, and can be done without increasing the deviation of train running time in one circle. The latter entails that the train timetable is upheld, which guarantees that the demand for passenger transport services is met and the quality of services in the urban rail transit system is maintained. This study proposes a multi-objective optimization model for urban railways with timetable optimization to minimize the total energy consumption of trains while maximizing the quality of service. To this end, we apply the principles and ideas of calculus to reduce the power of the velocity in the train energy consumption model. This greatly simplifies the complexity of the optimization model. Then, considering the conflicting requirements of decision-makers, weight factors are added to the objective functions to reflect decision-makers’ preferences for energy-saving and the quality of service. We adopt the nondominated sorting genetic algorithm-II (NSGA-II) to solve the proposed model. A practical case study of the Yizhuang urban railway line in Beijing is conducted to verify the effectiveness of the proposed model and evaluate the advantages of the optimal energy saving timetable (OEST) in comparison to the optimal quality of service timetable (OQOST). The results showed that the OEST reduced total energy consumption by 8.72% but increased the deviation of trains running time in one circle by 728 s. The total energy consumption was reduced by 6.09%, but there was no increase in the deviation of train running time in one circle with the OQOST.

scholarly journals Development of an Energy Saving Strategy Model for Retrofitting Existing Buildings: A Korean Case Study

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1626 ◽  
Author(s):  
Kwonsik Song ◽  
Yonghan Ahn ◽  
Joseph Ahn ◽  
Nahyun Kwon
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Energy Saving ◽  
Life Cycle Cost ◽  
Cost Effective ◽  
Existing Buildings ◽  
Energy Retrofit ◽  
Strategy Model ◽  
Proposed Model

The building sector accounts for approximately 40% of national energy consumption, contributing to the environmental crisis of global warming. Using energy saving measures (e.g., improved thermal insulation, highly energy-efficient electrical and mechanical systems) provides opportunities to reduce energy consumption in existing buildings. Furthermore, if the life cycle cost (i.e., installation, operation and maintenance cost) of the measures is considered with their energy saving potential, it is possible to establish a cost-effective energy retrofit plan. Therefore, this research develops an energy saving strategy model considering its saving potential and life cycle cost of the measures for reducing energy consumption in existing buildings. To test the validity of the proposed model, a case study is carried out on an educational facility in South Korea, in response to its overconsumption of energy. The results demonstrate that in terms of energy saving and life cycle cost, the optimal energy retrofit plan is more cost-effective than the existing plan. Also, the break-even point for the optimal energy retrofit plan is within five years, and then revenue from energy saving continually occurs until 2052. For energy retrofit of existing buildings, using the proposed model would enable building owners to maximize energy savings while minimizing the life cycle cost.

scholarly journals An energy-efficient metro speed profiles for energy savings: application to the Valencia metro

2016 ◽  
Author(s):  
Ignacio Villalba Sanchis ◽  
Pablo Salvador Zuriaga
Keyword(s):  
Energy Consumption ◽  
Energy Savings ◽  
Economic Cost ◽  
Rolling Stock ◽  
Net Energy ◽  
General Terms ◽  
Proposed Model ◽  
Single Vehicle ◽  
Reduction Of Energy Consumption ◽  
Actual Energy Consumption

Nowadays one of the main priorities for metro line operators is the reduction of energy consumption, due to the environmental impact and economic cost. In order to achieve this objective different strategies can be applied, normally focused into rolling stock, infrastructure and/or operation. Considering short-term measures and related to the traffic operation strategies, different approaches are being researched. One of the most effective strategy which reduce net energy consumption is the use of efficient driving techniques. These techniques produces a speed profile between two stations that requires the minimum net energy consumption, without degrading commercial running times or passenger comfort. In this paper, a computer model for calculating the metro vehicles speed profiles minimizing the energy consumption was developed. The equations considered in the model represent the behavior of a single vehicle operated under manual driving, subject to different constraints such as the headway, cycle time, distances and acceleration limits. The proposed model calculates different commands to be systematically executed by the driver. The resulting simulator has been tuned by means of on board measurements of speed, accelerations and energy consumption obtained along different lines in Metro de Valencia network. For this purpose, different scenarios are analyzed to assess the achievable energy savings. In general terms and comparing with the actual energy consumption, the solutions proposed can reduce the net energy consumption around 19%.DOI: http://dx.doi.org/10.4995/CIT2016.2016.3774

Brand Perception and its Relation to Perceived Performance of a Public Sports Service

2015 ◽  
pp. 202-220
Author(s):  
Mario Alguacil Jiménez ◽  
Ferran Calabuig Moreno ◽  
Juan M. Núnez-Pomar ◽  
Josep Crespo Hervás
Keyword(s):  
Quality Of Service ◽  
Data Analysis ◽  
Structural Equations ◽  
Measurement Scales ◽  
Perceived Performance ◽  
Perception Of Quality ◽  
Brand Perception

In sport context, many contributions are involved in the perception of quality and satisfaction in sport services, but in regards to brand perception, such studies are much less common. Virtually no work is aimed at brand awareness of sports services. In the book chapter the authors expose a case study that analyze the users perception of the image of the service and is related to some performance indicators such as quality of service, satisfaction and future intentions. Data analysis is performed using structural equations and measurement scales adapted to sports facilities. The results of this study show that quality is explained by congruence with a high percentage of variance (76.6%), the latter concept being the aspect with the greatest predictive weight. Furthermore, future intentions are explained by attitudes towards the brand and quality, the latter being the element with greater predictive power.

Quality of Experience (QoE) for Wireless Video Over Critical Communication Systems

2017 ◽  
pp. 132-167
Author(s):  
Emad Danish ◽  
Mazin I. Alshamrani
Keyword(s):  
Resource Allocation ◽  
Quality Of Service ◽  
Energy Consumption ◽  
Communication Systems ◽  
Quality Of Experience ◽  
Service Providers ◽  
Wireless Video ◽  
User Centric ◽  
Near Future

Video streaming is expected to acquire a massive share of the global internet traffic in the near future. Meanwhile, it is expected that most of the global traffic will be carried over wireless networks. This trend translates into considerable challenges for Service Providers (SP) in terms of maintaining consumers' Quality of Experience (QoE), energy consumption, utilisation of wireless resources, and profitability. However, the majority of Radio Resource Allocation (RRA) algorithms only consider enhancing Quality of Service (QoS) and network parameters. Since this approach may end up with unsatisfied customers in the future, it is essential to develop innovative RRA algorithms that adopt a user-centric approach based on users' QoE. This chapter focus on wireless video over Critical communication systems that are inspired by QoE perceived by end users. This chapter presents a background to introduce the reader to this area, followed by a review of the related up-to-date literature.

Providing Quality of Service across Multiple Providers

2010 ◽  
pp. 280-296
Author(s):  
Christos Bouras ◽  
Apostolos Gkamas ◽  
Kostas Stamos
Keyword(s):  
Quality Of Service ◽  
Network Management ◽  
Network Services ◽  
Qos Provisioning ◽  
Backbone Networks ◽  
Important Quality ◽  
Academic Network ◽  
Research And Education

In this chapter, the authors present some of the latest developments related to the provisioning of Quality of Service (QoS) in today’s networks and the associated network management structures that are or will be deployed to support them. They first give a brief overview of the most important Quality of Service proposals in the areas of Layer 2 (L2) and Layer 3 (L3) QoS provisioning in backbone networks, and they discuss the network management structures and brokers that have been proposed in order to implement these services. As a case study, they describe the pan-european research and academic network, which is supported centrally by GEANT and which encompasses multiple independent NRENs (National Research and Education Networks). In the last few years, GEANT has developed and deployed a number of production and pilot services meant for the delivery of quality network services to the end users across Europe.

Sign in / Sign up

Export Citation Format

Share Document