This study proposes a novel conical monopole antenna with a metallic lid connected to the antenna ground through four pillars. The proposed conical monopole antenna is only 0.14-λ 0 in height, which is low profile, ...
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This study proposes a novel conical monopole antenna with a metallic lid connected to the antenna ground through four pillars. The proposed conical monopole antenna is only 0.14-λ 0 in height, which is low profile, compact in size, and suitable for automotive antenna application. By using the metallic lid placed above the conical shell monopole antenna, the measured peak gain 6.6 dBi, efficiency 84 %, and omnidirectional radiation on the horizontal plane at 5.875 GHz are achieved. The antenna is embedded into a shark-fin radome and mounted on the rooftop of a vehicle to experimentally validate the application of vehicular communication system.
The purpose of this study is to present an approach to analyze and recognize the driver posture. By using the wearable device, the sensing data of the driving behavior postures can be collected and calibrated. The cal...
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ISBN:
(纸本)9781479987467
The purpose of this study is to present an approach to analyze and recognize the driver posture. By using the wearable device, the sensing data of the driving behavior postures can be collected and calibrated. The calibrated data is as the input parameters of driving behavior modeling. Then, the Hidden Markov Model (HMM) is utilized to establish the driving behavior posture models. The HMM model can recognize 7 kinds of head postures. Moreover, the static indoor environment and dynamic in-car environment are considered in modeling process. Finally, the constructed driving behavior model can apply to in-car service to provide driver more convenient control service.
Commercial vehicles are used for delivering goods, and they differ from private vehicles in height, width, weight and turning radius. Some providers account for the weight, height, and access limits of large vehicles ...
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ISBN:
(纸本)9781479964482
Commercial vehicles are used for delivering goods, and they differ from private vehicles in height, width, weight and turning radius. Some providers account for the weight, height, and access limits of large vehicles in their navigation systems, but none of them have considered the turning capability of large vehicles. This has led to a loss of confidence in navigation systems among many commercial vehicle drivers. This paper proposes a method for navigation systems to calculate the shortest path while taking into account the turning capability of commercial vehicles. Map data processing and algorithm design have been adjusted to reflect the routes rendered slow or impassable for commercial vehicles due to tight turns. This paper integrates spatial data and shortest path algorithms to develop a shortest path computing mechanism that applies to large commercial vehicles. Field testing confirmed that the calculation method proposed by this paper provided route guidance appropriate to the characteristics of commercial vehicles.
The IEEE 1609 and 802.11p protocol family (also known as WAVE/DSRC or DSRC network) developed by IEEE are key wireless technologies for time-critical safety message broadcast in vehicular Ad Hoc Networks (VANETs). The...
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ISBN:
(纸本)9781479929153
The IEEE 1609 and 802.11p protocol family (also known as WAVE/DSRC or DSRC network) developed by IEEE are key wireless technologies for time-critical safety message broadcast in vehicular Ad Hoc Networks (VANETs). The WAVE/DSRC network removes the layer-2 association procedure and thus greatly differs from traditional WiFi technologies. With this capability, critical information can be sent within a very short period, making it suitable for realizing Vehicle-to-Vehicle (V2V) safety applications and Roadside-to-Vehicle (R2V) Intelligent Transportation system (ITS) applications. In a recent project, the WAVE/DSRC technology has been studied for the use of speed enforcement system. This paper presents a case study of integrating the state-of-the-art WAVE/DSRC technology into a new-type of speed enforcement system called the Augmented Speed Enforcement (aSE) system. The design, the architecture, and the details of field tests in Los Banos, California, will be discussed. In addition, experimental results regarding the DSRC and 3G radio performance in the field will be analyzed in this paper.
Due to the vehicles have the similar directions and velocities of motion, lots of vehicles may connect to the same one relay vehicle at the same time. These unexpected connection requests cause an imbalanced loading i...
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Due to the vehicles have the similar directions and velocities of motion, lots of vehicles may connect to the same one relay vehicle at the same time. These unexpected connection requests cause an imbalanced loading in the system. To aim to this imbalance loading problem, this paper presents two novel mechanisms. The proposed approaches are developed based on Markov chain model. When a vehicle receives the network topology message, it can calculate a new handover threshold value and then perform a handover procedure, switching to a better relay vehicle to balance system load. The effectiveness of the proposed approaches is verified by simulation. The simulation results indicate that the proposed schemes can balance the system loading significantly.
With wireless communication network and GPS positioning technology, most of current existing systems using IP protocol to provide various information services such as traffic and navigation. In this paper, we propose ...
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A recent surge of research on vehicular ad hoc networks (VANETs) has given us new opportunities and challenges. Aside from safety-related applications, commercial applications also find their way to fully utilize thes...
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