This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
By facilitating public busesʼ movement through traffic signal-controlled intersections, a transit... more By facilitating public busesʼ movement through traffic signal-controlled intersections, a transit signal priority (TSP) strategy can contribute to the reduction of queuing time at intersections. However, the traditional TSP also has a significant downside; it is detrimental to non-prioritized movements and other transport modes. This research proposes new TSP strategies that account for optimization for the person delay at an intersection along a corridor. This research focused both on major arterial roads and minor arterial roads, whereas the majority of the publications only addressed the major arterial approach. As part of this research, the bus schedule was also taken into consideration, whereas in other studies, the measure of giving priority was only the approach to the intersection. The proposed method is described in detail and also is implemented on arterial corridor in VISSIM. The study area simulation results indicated that the proposed TSP methods performed better than t...
Journal of Research in Science, Engineering and Technology, 2021
Nowadays, the stores always want to find a valid plan for perishable products as a challengeable ... more Nowadays, the stores always want to find a valid plan for perishable products as a challengeable concern for the management of perishable items. As known, regarding the perishable products which have a limitation for consumption, we cannot force the consumers to buy the products which are close to their shelf-life time. To address this challenge, this paper considers a hybrid of FIFO and LIFO strategies and its impact on the profits of the vendor managed inventory contracts which are very little discussion in the literature. Most importantly, this paper deals with an inventory system for perishable products stochastically with a new optimization model. The proposed problem computes the costs of the order and storage with two different holding costs based on the FIFO and LIFO strategies as well as the profits from selling of the products. With a maximizing optimization model, the goal is to find the optimal order for each store in per period. The model is solved by the dynamic progra...
In this work a robust generating system for a 5 MW PMSM wind turbine system with diode rectifie... more In this work a robust generating system for a 5 MW PMSM wind turbine system with diode rectifier and DC/DC converter connected to DC link has been investigated. The design and efficiency have been studied using MATLAB Simulink and SIMPLORER and the result shows that this system topology has high efficiency. The result found was that the same generator that can provide 5 MW using an IGBT-Converter, can only give 2.5 MW using a diode rectifier and a variable DClink. However, with series and parallel compensations the same generator can provide an output power even more than 5 MW. It was also found that the efficiencies of systems at rated operation with IGBT-converter, diode rectifier with series compensation and shunt compensation are 97.6%, 98.6%, and 98.9%, respectively. Moreover, the systems efficiency at 5% of load are 93.0%, IGBT-converter, 97.3%, series compensation, and 95.3%, shunt compensation. The required reactive power for series compensation and shunt compensation to provide 5 MW output power for the diode rectifier system, at rated operation, are 1.5 MVar and 2.8 MVar, respectively. To conclude, the diode rectifier with series compensation is more efficient for low wind speed (4-11m/s) also it needs less reactive power; however, the shunt compensation scenario has better efficiency at rated speed when the wind speed is higher than 12m/s.
Nowadays, the stores always want to find a valid plan for perishable products as a challengeable ... more Nowadays, the stores always want to find a valid plan for perishable products as a challengeable concern for the management of perishable items. As known, regarding the perishable products which have a limitation for consumption, we cannot force the consumers to buy the products which are close to their shelf-life time. To address this challenge, this paper considers a hybrid of FIFO and LIFO strategies and its impact on the profits of the vendor managed inventory contracts which are very little discussion in the literature. Most importantly, this paper deals with an inventory system for perishable products stochastically with a new optimization model. The proposed problem computes the costs of the order and storage with two different holding costs based on the FIFO and LIFO strategies as well as the profits from selling of the products. With a maximizing optimization model, the goal is to find the optimal order for each store in per period. The model is solved by the dynamic progra...
Many signalized intersections are characterized with frequent left-turn moves. Vehicles waiting f... more Many signalized intersections are characterized with frequent left-turn moves. Vehicles waiting for a protected left turn may form long queues, which will increase the intersection delay and negatively impact the network performance. Researchers and practitioners across various countries underline that access management leads to a smoother traffic flow. One way of access management at intersections is to eliminate the direct left-turn maneuver. This study aims to evaluate how the traffic conditions will be affected from replacing the direct left turn with the right-turn U-turn maneuver at intersections. In case of the right-turn U-turn maneuver, a vehicle turns right instead of making the left turn and travels either to the median opening or to the next intersection to make a U-turn. Two simulation models are built using the Synchro Studio and Aimsun simulation software packages based on the data, collected from one of the busiest intersections in Tehran (Iran), to quantify the effe...
Industrialization, urban development, and population growth in the last decades caused a signific... more Industrialization, urban development, and population growth in the last decades caused a significant increase in congestion of transportation networks across the world. Increasing congestion of transportation networks and limitations of the traditional methods in analyzing and evaluating the congestion mitigation strategies led many transportation professionals to the use of traffic simulation techniques. Nowadays, traffic simulation is heavily used in a variety of applications, including the design of transportation facilities, traffic flow management, and intelligent transportation systems. The literature review, conducted as a part of this study, shows that many different traffic simulation packages with various features have been developed to date. The present study specifically focuses on a comprehensive comparative analysis of the advanced interactive microscopic simulator for urban and non-urban networks (AIMSUN) and SimTraffic microsimulation models, which have been widely u...
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
By facilitating public busesʼ movement through traffic signal-controlled intersections, a transit... more By facilitating public busesʼ movement through traffic signal-controlled intersections, a transit signal priority (TSP) strategy can contribute to the reduction of queuing time at intersections. However, the traditional TSP also has a significant downside; it is detrimental to non-prioritized movements and other transport modes. This research proposes new TSP strategies that account for optimization for the person delay at an intersection along a corridor. This research focused both on major arterial roads and minor arterial roads, whereas the majority of the publications only addressed the major arterial approach. As part of this research, the bus schedule was also taken into consideration, whereas in other studies, the measure of giving priority was only the approach to the intersection. The proposed method is described in detail and also is implemented on arterial corridor in VISSIM. The study area simulation results indicated that the proposed TSP methods performed better than t...
Journal of Research in Science, Engineering and Technology, 2021
Nowadays, the stores always want to find a valid plan for perishable products as a challengeable ... more Nowadays, the stores always want to find a valid plan for perishable products as a challengeable concern for the management of perishable items. As known, regarding the perishable products which have a limitation for consumption, we cannot force the consumers to buy the products which are close to their shelf-life time. To address this challenge, this paper considers a hybrid of FIFO and LIFO strategies and its impact on the profits of the vendor managed inventory contracts which are very little discussion in the literature. Most importantly, this paper deals with an inventory system for perishable products stochastically with a new optimization model. The proposed problem computes the costs of the order and storage with two different holding costs based on the FIFO and LIFO strategies as well as the profits from selling of the products. With a maximizing optimization model, the goal is to find the optimal order for each store in per period. The model is solved by the dynamic progra...
In this work a robust generating system for a 5 MW PMSM wind turbine system with diode rectifie... more In this work a robust generating system for a 5 MW PMSM wind turbine system with diode rectifier and DC/DC converter connected to DC link has been investigated. The design and efficiency have been studied using MATLAB Simulink and SIMPLORER and the result shows that this system topology has high efficiency. The result found was that the same generator that can provide 5 MW using an IGBT-Converter, can only give 2.5 MW using a diode rectifier and a variable DClink. However, with series and parallel compensations the same generator can provide an output power even more than 5 MW. It was also found that the efficiencies of systems at rated operation with IGBT-converter, diode rectifier with series compensation and shunt compensation are 97.6%, 98.6%, and 98.9%, respectively. Moreover, the systems efficiency at 5% of load are 93.0%, IGBT-converter, 97.3%, series compensation, and 95.3%, shunt compensation. The required reactive power for series compensation and shunt compensation to provide 5 MW output power for the diode rectifier system, at rated operation, are 1.5 MVar and 2.8 MVar, respectively. To conclude, the diode rectifier with series compensation is more efficient for low wind speed (4-11m/s) also it needs less reactive power; however, the shunt compensation scenario has better efficiency at rated speed when the wind speed is higher than 12m/s.
Nowadays, the stores always want to find a valid plan for perishable products as a challengeable ... more Nowadays, the stores always want to find a valid plan for perishable products as a challengeable concern for the management of perishable items. As known, regarding the perishable products which have a limitation for consumption, we cannot force the consumers to buy the products which are close to their shelf-life time. To address this challenge, this paper considers a hybrid of FIFO and LIFO strategies and its impact on the profits of the vendor managed inventory contracts which are very little discussion in the literature. Most importantly, this paper deals with an inventory system for perishable products stochastically with a new optimization model. The proposed problem computes the costs of the order and storage with two different holding costs based on the FIFO and LIFO strategies as well as the profits from selling of the products. With a maximizing optimization model, the goal is to find the optimal order for each store in per period. The model is solved by the dynamic progra...
Many signalized intersections are characterized with frequent left-turn moves. Vehicles waiting f... more Many signalized intersections are characterized with frequent left-turn moves. Vehicles waiting for a protected left turn may form long queues, which will increase the intersection delay and negatively impact the network performance. Researchers and practitioners across various countries underline that access management leads to a smoother traffic flow. One way of access management at intersections is to eliminate the direct left-turn maneuver. This study aims to evaluate how the traffic conditions will be affected from replacing the direct left turn with the right-turn U-turn maneuver at intersections. In case of the right-turn U-turn maneuver, a vehicle turns right instead of making the left turn and travels either to the median opening or to the next intersection to make a U-turn. Two simulation models are built using the Synchro Studio and Aimsun simulation software packages based on the data, collected from one of the busiest intersections in Tehran (Iran), to quantify the effe...
Industrialization, urban development, and population growth in the last decades caused a signific... more Industrialization, urban development, and population growth in the last decades caused a significant increase in congestion of transportation networks across the world. Increasing congestion of transportation networks and limitations of the traditional methods in analyzing and evaluating the congestion mitigation strategies led many transportation professionals to the use of traffic simulation techniques. Nowadays, traffic simulation is heavily used in a variety of applications, including the design of transportation facilities, traffic flow management, and intelligent transportation systems. The literature review, conducted as a part of this study, shows that many different traffic simulation packages with various features have been developed to date. The present study specifically focuses on a comprehensive comparative analysis of the advanced interactive microscopic simulator for urban and non-urban networks (AIMSUN) and SimTraffic microsimulation models, which have been widely u...
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