Energy Saving Potentials of Demand-Controlled Ventilation Based On the Real-Time Traffic Load in Underground Parking Facilities

AEI 2013 ◽  
2013 ◽  
Author(s):  
Hong-Jae Cho ◽  
Jae-Weon Jeong
Keyword(s):  
Energy Saving ◽  
Real Time ◽  
Traffic Load ◽  
The Real ◽  
Controlled Ventilation ◽  
Real Time Traffic ◽  
Demand Controlled Ventilation ◽  
Parking Facilities

scholarly journals Simple and effective QoS schemes supporting VoIP traffic in IEEE 802.11 network

2021 ◽  
Author(s):  
Samson Chung Fai Chan
Keyword(s):  
Real Time ◽  
Ieee 802.11 ◽  
Ad Hoc Network ◽  
Ad Hoc ◽  
Traffic Load ◽  
Differentiated Service ◽  
Dynamic Adjustment ◽  
Bandwidth Utilization ◽  
The Real ◽  
Real Time Traffic

This thesis presents several simple and effective QoS schemes aimed to support VoIP in the IEEE 802.11 network. The proposed schemes are called dynamic backoff adjustment (DBA), high priority DCF (HP-DCF), adaptive DCF (ADCF) and direct priority DCF (DP-DCF). All four schemes utilize the contention mechanism and are compatible with the IEEE 802.11 standard. The first three schemes use dynamic adjustment approach to improve the delay of high-priority traffic in infrastructure network and the last schemes is designed for use in ad-hoc network. From the simulation results, the DBA scheme shows better bandwidth utilization over DCF and provides better differentiated service performance than EDCF. Whereas, the HP-DCF and AP schemes give better protection of the real-time traffic classes from the excessive best-effort traffic load in the infrastructure mode. Moreover, the DP-DCF also shows its ability in protecting the real-time traffic class in the ad-hoc environment.

scholarly journals Simple and effective QoS schemes supporting VoIP traffic in IEEE 802.11 network

2021 ◽  
Author(s):  
Samson Chung Fai Chan
Keyword(s):  
Real Time ◽  
Ieee 802.11 ◽  
Ad Hoc Network ◽  
Ad Hoc ◽  
Traffic Load ◽  
Differentiated Service ◽  
Dynamic Adjustment ◽  
Bandwidth Utilization ◽  
The Real ◽  
Real Time Traffic

This thesis presents several simple and effective QoS schemes aimed to support VoIP in the IEEE 802.11 network. The proposed schemes are called dynamic backoff adjustment (DBA), high priority DCF (HP-DCF), adaptive DCF (ADCF) and direct priority DCF (DP-DCF). All four schemes utilize the contention mechanism and are compatible with the IEEE 802.11 standard. The first three schemes use dynamic adjustment approach to improve the delay of high-priority traffic in infrastructure network and the last schemes is designed for use in ad-hoc network. From the simulation results, the DBA scheme shows better bandwidth utilization over DCF and provides better differentiated service performance than EDCF. Whereas, the HP-DCF and AP schemes give better protection of the real-time traffic classes from the excessive best-effort traffic load in the infrastructure mode. Moreover, the DP-DCF also shows its ability in protecting the real-time traffic class in the ad-hoc environment.

A simplified model for evaluating the energy saving potential of adopting demand controlled ventilation in office buildings in Hong Kong

2016 ◽  
Vol 27 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Jie Jia ◽  
Wai-Ling Lee ◽  
Hua Chen ◽  
Han Li
Keyword(s):  
Hong Kong ◽  
Energy Saving ◽  
Office Buildings ◽  
Simplified Model ◽  
Design Parameters ◽  
Subtropical Climate ◽  
Original Design ◽  
Energy Saving Potential ◽  
Controlled Ventilation ◽  
Demand Controlled Ventilation

Demand controlled ventilation (DCV) to conserve energy while maintaining an acceptable indoor environment has been used for over 30 years. However, little work has been done on evaluating its energy saving potential in cooling dominant office buildings in subtropical climate. In this study, the energy saving potential of DCV system for use in six representative office buildings in Hong Kong was investigated by simulations. Simulation validation was done based on in situ measurements and site surveys. The findings show that, based on their original design conditions, the use of DCV could lead to 12.5–26.1% energy saving. To facilitate quick estimation of the energy saving potential of DCV system, further simulations were performed for the development of a simplified model. The simplified model relates the energy saving potential to key air-conditioning system and design parameters. Based on the simplified model, sensitivity analysis was conducted to quantify the influences of different parameters on the energy saving potential of DCV system. The developed model method can be used for prediction on the energy saving potential in a wider application of DCV in Hong Kong.

scholarly journals Research on Optimized Control Model of Freeway Based on Dynamic Traffic Demand Estimation

2014 ◽  
Vol 6 ◽  
pp. 797293 ◽  
Author(s):  
Zhu Jiang ◽  
Shubin Li
Keyword(s):  
Optimal Control ◽  
Real Time ◽  
Demand Estimation ◽  
Control Model ◽  
Control Module ◽  
Traffic Demand ◽  
The Real ◽  
Traffic Conditions ◽  
Real Time Traffic ◽  
Global Optimal

According to the estimation information of dynamic traffic demands, a novel optimal control model of freeway was established on the basis of the hierarchical concept. There are four control modules in this model. The OD prediction module predicts the total traffic demands in a long time and determines the upper bound of the future queuing length in advance; the global optimal control module predicts the future traffic state and establishes the coordination constraints for each ramp in the network; the traffic demand estimation module estimates the real-time traffic conditions for each ramp; the local adaptive control module regulates ramp metering rate according to the estimated information of the real-time traffic conditions and the results optimized by the global optimal control module. The simulation results show that this control system is of a good dynamic performance. It coordinates the benefits of various ramps and optimizes the overall performance of the freeway network.

Research of Paddle Wave-Maker Control System Based on Jonswap Spectrum

2014 ◽  
Vol 1006-1007 ◽  
pp. 679-684
Author(s):  
Xue Fei Huang ◽  
Mao Pang
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Energy Saving ◽  
Real Time ◽  
Personal Computer ◽  
Control Algorithm ◽  
Change Rate ◽  
The Real ◽  
Wave Maker ◽  
Jonswap Spectrum

According to large energy consumption, overload and re-reflection problemr, the control algorithm of wave-maker has been improved based on Jonswap spectrum. The control algorithm is comprised of the offline calculation of the control waveform and the real-time governing of the wave paddle. Offline algorithm is implemented on a personal computer, whereas paddle control is realized on a programmable automation controller. The experiments results show that the speed is continuous and stable, change rate of load has been optimized obviously and achieves the purpose of energy saving.

Research on the Traffic Simulation Platform Based on the Real-Time Mobile Phone Data

2012 ◽  
Vol 253-255 ◽  
pp. 1365-1368
Author(s):  
Ge Qi Qi ◽  
Jian Ping Wu ◽  
Yi Man Du
Keyword(s):  
Mobile Phone ◽  
Real Time ◽  
Traffic Simulation ◽  
Rapid Development ◽  
Mobile Phone Data ◽  
Simulation Platform ◽  
Traffic Data ◽  
The Real ◽  
Real Time Traffic ◽  
Wide Range

With the rapid development of the society, the transportation system has become more complicated and vulnerable. For simulating the real-time traffic condition of the whole city, a wide range of OD matrix data are needed which are hard to collect in whole based on the present conventional methods. The paper raises a feasible design of the traffic simulation platform based on the real-time mobile phone data. The popularity and development of mobile phones make the vast amounts of real-time traffic data can be collected and usable. With the help of the GIS module, dynamic OD traffic generation module and other related modules, the real-time mobile phone data will be converted to the valuable traffic data and applied to the traffic simulation platform.

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