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Full-Text Articles in Engineering
Delay And Energy Tradeoff In Multi-State Wireless Sensor Networks, W. L. Leow, H. Pishro-Nik, Daiheng Ni
Delay And Energy Tradeoff In Multi-State Wireless Sensor Networks, W. L. Leow, H. Pishro-Nik, Daiheng Ni
Daiheng Ni
This paper discusses a first attempt to investigate, using analytic means, the transmission delay and energy char- acteristics of a multi-state wireless sensor network. For such a network with n nodes, where each node can be active, resting or sleeping, a model that describes the transition of a node from one state to another and the probability associated with each state is proposed. Asymptotic analyses of transmission delay and energy are presented. We report the presence of a threshold for the arrival rate of data packets that decides which energy component dominates. The transmission delay-energy tradeoff is presented for the …
Development Of A Prototype Intersection Collision Avoidance System Under Vii, Daiheng Ni, Hossein Pishro-Nik, Richa Prasad, Mohammed Raza Kanjee, Hui Zhu, Thai Nguyen
Development Of A Prototype Intersection Collision Avoidance System Under Vii, Daiheng Ni, Hossein Pishro-Nik, Richa Prasad, Mohammed Raza Kanjee, Hui Zhu, Thai Nguyen
Daiheng Ni
Vehicle collisions at in tersections account for a large percen tage of overall traffic accidents, a good portion of which are fatal. A large number of these accidents can be avoided by a warning system which makes a driver aware of potential collisions on the road, thus allowing the driver enough time to preven t such situations. This pape r presents the design of a prototype intersection collision warning system based on Vehicle Infrastructure Integration (VII). Underlying the system are wireless communications, positioning technology, and information technology that ensure accu rate and timely safety information.
Forty-Fifth Annual Allerton Conference On Communication, Control, And Computing, H. Pishro-Nik, A. Ganz, Daiheng Ni
Forty-Fifth Annual Allerton Conference On Communication, Control, And Computing, H. Pishro-Nik, A. Ganz, Daiheng Ni
Daiheng Ni
This paper initiates the study of scaling laws for vehicular ad hoc networks (VANET)s. It provides a general framework to study VANETs. The fundamental capacity limits of these networks are investigated and we show how the road geometry affects this capacity. The VANET capacity is calculated for different road structures. The need for new capacity metrics is dis- cussed. These results are obtained by combining geomet- rical analysis, network flow arguments, and probabilistic study of VANETs.
Modeling Traffic Flow Under Emergency Evacuation Situations: Current Practice And Future Directions, Kevin D. Moriarty, Daiheng Ni, John Collura
Modeling Traffic Flow Under Emergency Evacuation Situations: Current Practice And Future Directions, Kevin D. Moriarty, Daiheng Ni, John Collura
Daiheng Ni
The use of evacuation operations in response to emergency conditions has become commonplace. Until recently, planning and response operations have largely been the concern of emergency management personnel. The reoccurrence of catastrophic events, however, has transp ortation officials becoming in creasingly interested in working to improve evacuation efficiency. Emergency managers and transportation officials have employed the use of traffic simulation software to aid in evacuation planning and to evaluate evacuation operations. Effective emergency simulation software needs to be able to capture the major factors influencing evacuation response. This paper aims to discuss the broad role of transportation and the use …