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A separate turn phase is often used at intersection with heavy left turns. This wastes capacity on the approach because some of its lanes cannot discharge during its green phases. The problem can be eliminated by reorganizing traffic on all the lanes upstream of an intersection using a mid-block pre-signal. To evaluate the effectiveness of the pre-signal control system, this study has also conducted...
This paper described a digitally controlled Buck converter. In this converter, the compensator implements the classic linear PID control law by the fixed-point algorithm. A proposed verification method is performed in Simulink environment. The structure of low area and power cost Ring ADC and high resolution DPWM is also introduced, respectively. The consistent mathematic and Spice simulation result...
Signal controlled intersection is critical to the urban traffic network, signal timing optimization is important to reduce traffic delays, relieve congestion, and improve the operation of urban traffic network. This study proposed a phase sequence optimization model for coordination control based on NEMA phase. After establishing the experimental network, VISSIM was adopted for testifying the effectiveness...
In this paper we proposed a new broadcast protocol AEBP (Adaptive Efficient Broadcast protocol) for delay tolerant network. By collecting the average neighbor node numbers and packet TTLs, AEBP can judge if a data packet should be broadcasted. Simulation result shows that AEBP can significantly reduce the packet transitions and achieve good data packet arriving rate. Thus the performance of the network...
Delay/Disruption Tolerant Networks (DNTs) enables nodes to communicate by means of asynchronous sending messages without the need for an end-to-end path. In this paper, we study the problem of multicasting in DTNs. Several schemes have been proposed for multicast routing assuming the group of message receivers is known by sender, and the group members do not change during the process of message delivery...
Mobile ad hoc networks will often be deployed in environments where the nodes of the networks are unattended and have little or no physical protection against tampering. The nodes of mobile ad hoc networks are thus susceptible to compromise. The networks are particularly vulnerable to denial of service (DoS) attacks launched through compromised nodes or intruders. In this paper, we investigated the...
This paper presents a comparative study between JET (Just Enough Time) and a number of new preemptive channel scheduling algorithms in optical burst switching (OBS) with QoS (Quality of Service) requirement. In terms of performance criteria, loss rate in byte, access delay and end-to-end delay are considered. A 2-state MMPP (Markov Modulated Poisson Process) traffic generator on a 14-node mesh network...
In order to reduce traffic delay, a novel urban trunk road traffic signal coordinated control method was presented. Firstly, a multi-objective immune algorithm based on multi-population was proposed. By this way, it can effectively prevent population retrogression; promote diversity and the whole optimal searching ability of genetic algorithm. Considering the traffic delay of the uplink vehicles and...
In order to reduce traffic delay, a novel urban trunk road traffic signal coordinated control method using a multi-Population immune algorithm was presented. Considering the traffic delay of the uplink vehicles and the down vehicles at different times on the trunk road, the objection function for total delay is set up, and the objection function optimization based on multi-Population immune algorithm...
Wireless local area networks (WLANs) are increasingly popular because of their flexibility. This spreading of WLANs comes with an increasing use of multimedia applications. Such applications are bandwidth sensitive and require a quality of service (QoS) that guarantees high performance transmission of continuous data. This requirement is the focus of the new enhanced IEEE 802.11e standard protocol...
Traffic signal control for pedestrian crossing is an effective measure to improve safety and efficiency of pedestrian crossing. Fuzzy logic is known to be suited for dealing with a complex optimization problem, as pedestrian crossing control, with many objectives, many constrains, unclear input information, and vague decision criteria. In this study, a new fuzzy logic is introduced for controlling...
IEEE802.16, as a wireless MAN broadband access standard, defines a flexible QoS mechanism in MAC layer for wild variety classes of services. However, it dose not define specific admission control strategy and scheduling algorithm, which are becoming the research hotspot in recent years. In this paper, we focus on the features of services defined in IEEE802.16, including UGS, ertPS, rtPS, nrtPS and...
A new super-resolution algorithm for time delay estimation (TDE) of multipath propagation signals base on least square criterion was proposed. The idea was to decompose the observed data into their signal components and then to estimate the amplitude and time delay of each signal components separately, using cubic slpline interpolation and basing on least square criterion. The algorithm iterated back...
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