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Stable And Fair Congestion Control Mechanisms For Cooperative Vehicle Safety In Vehicular Networks, Neda Nasiriani
Stable And Fair Congestion Control Mechanisms For Cooperative Vehicle Safety In Vehicular Networks, Neda Nasiriani
Graduate Theses, Dissertations, and Problem Reports
Cooperative vehicle safety (CVS) systems operate based on broadcast of vehicle position and safety information to neighboring cars. The communication medium of CVS is a Dedicated Short Range Communication (DSRC) wireless channel. One of the main challenges in large scale deployment of CVS systems is the issue of scalability. To address the scalability problem, several congestion control methods have been proposed and are currently under field study. These mechanisms adapt transmission rate and power, based on network measures such as: Channel Busy Ratio (CBR), packet reception rate and vehicles tracking error. Channel Busy Ratio (CBR) is defined as the ratio …
Analyzing The Impact Of Wireless Multi-Hop Networking On Vehicular Safety, Rudhir Upretee
Analyzing The Impact Of Wireless Multi-Hop Networking On Vehicular Safety, Rudhir Upretee
Graduate Theses, Dissertations, and Problem Reports
One of the core challenges of Intelligent Transportation System is the dissemination of timely and accurate vehicle information (e.g. speed, position) to geographically large distances without compromising data supply rates from immediate neighbors. This feature is critical for the design of vehicle safety and navigation applications. Single hop broadcasting is often inadequate to ensure vehicle safety when the platoon size is arbitrarily large due to its upper bound on rate and range of wireless message transmission. Existing wireless multi-hop protocols do not ensure reliable message delivery while avoiding network congestion in the shared channel. In this thesis, we make two …
Investigation Of The Dual-Fuel Conversion Of A Direct Injection Diesel Engine, John S. Smallwood
Investigation Of The Dual-Fuel Conversion Of A Direct Injection Diesel Engine, John S. Smallwood
Graduate Theses, Dissertations, and Problem Reports
The transportation sector is the second largest energy-consuming sector in the United States. With heavy-duty vehicles comprising 20% of the sector and petroleum products being used as 93% of the sector's fuel, alternatives fuels continue to be investigated to offset petroleum usage. Natural gas is increasingly being considered as a fuel source due to its abundance in the Marcellus Shale Formation. Compressed natural gas (CNG) is a promising energy source for dual-fuel combustion. It appears to benefit the environment and the economy. With the ability to reduce oxides of nitrogen (NOx) emissions, carbon dioxide (CO2) emissions, and particulate matter (PM) …
Investigation Of Emissions And Fuel Economy For The Integrated Bus Information System, Jun Tu
Investigation Of Emissions And Fuel Economy For The Integrated Bus Information System, Jun Tu
Graduate Theses, Dissertations, and Problem Reports
The primary objective of this study was to investigate emissions and fuel economy, and develop an Integrated Bus Information System (IBIS) for the Federal Transit Administration (FTA). IBIS included the development of transit fleet emissions models to assist transit agencies in evaluating the emissions implications of new transit vehicle procurements. Compared with existing models, the IBIS prediction model was intended to be less complicated but have sufficient accuracy to achieve its task as a vehicle procurement analysis tool.;Fuel economy (FE) and distance specific emissions (g/mile) were evaluated and predicted by the IBIS model, including carbon monoxide (CO), carbon dioxide (CO2), …
Characterization Of The Composition And Toxicity Of Particulate Matter Emissions From Advanced Heavy-Duty Natural Gas Engines, Arvind Thiruvengadam Padmavathy
Characterization Of The Composition And Toxicity Of Particulate Matter Emissions From Advanced Heavy-Duty Natural Gas Engines, Arvind Thiruvengadam Padmavathy
Graduate Theses, Dissertations, and Problem Reports
Heavy-duty natural gas engines compliant with the 2010 EPA emissions standards have a clear advantage over diesel engines in meeting regulations with minimal after-treatment configuration. Heavy-duty natural gas engines are largely promoted as a cleaner burning engine with respect to low PM mass emissions. However, lack of sufficient data and literature on the exhaust emissions from advanced natural gas engines and the potential adverse health effects has raised concern amongst regulatory agencies. Also, the ammonia emissions from three-way catalyst equipped heavy-duty natural gas engines could be a major contributor to the formation of secondary PM in the atmosphere.;This CARB funded …