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Urban area traffic signal control is a complicated issue. Based on the characteristics of vehicle delay, this paper proposes a method for signal timing and phase optimization. Particle swarm optimization (PSO) is adopted to optimize the multiphase traffic signal timing and phase sequence at the intersection. The optimization objective is to minimize the average vehicle delay of every cycle at the...
To solve the signal control problems created by the mutual interference between motor traffic and pedestrians in cities, the signal control model with pedestrians non-complying is proposed based on the traditional signal optimization model. A particle swarm algorithm is proposed to solve the signal control problem. Based on an intersection of Tianhe district in Guangzhou City, the model is calculated...
An improved algorithm for arterial traffic coordinated control was described, The algorithm used optimization of the maximum bandwidth for the upper target, and used the optimization of the minimum delay of the turning traffic flow for the lower target, to get the best phase difference. A mixed integer linear programming was built based on MAXBAND method. And evaluation result using Vissim simulation...
The results of experimental studies of the parameters (amplitude and duration) of a supershort avalanche electron beam (SAEB) generated in air at atmospheric pressure are presented. The performed studies of the SAEB current amplitude and pulse duration have shown that the optimization of the gap h between the wires and the rear wall of the wires cathode and a decrease in the total cathode thickness...
This paper proposes a simple scheme to optimise the end-to-end user throughput of small, multi-hop wireless networks. The scheme which involves the introduction of small delays between successive packet transmissions at the source node has been tested on an indoor wireless mesh testbed for uni-directional flows of data traffic with nodes that use Chirp Spread Spectrum technology. Results from a series...
Multiple Description (MD) source coding is a technique that breaks a media stream into equally important sub-streams which can be sent over different paths for protection against channel errors in wireless networks. In this paper, we explore the possibility of sending the descriptions through different paths and intermediately merging them to exploit recovery of the corrupted descriptions from the...
The implementation of Model Predictive Control (MPC) requires to solve an optimization problem online. The computation time, often not negligible especially for Nonlinear MPC (NMPC), introduces a delay in the feedback loop. Moreover, it impedes fast sampling rate setting for the controller to react to uncertainties quickly. In this paper, a dual time scale control scheme is proposed for linear/nonlinear...
With the rapid growth of wireless technologies and increasing number of mobile digital devices, mobility has been an important element on the Internet. NEMO Basic Support, designed by the Internet Engineering Task Force (IETF) to provide network mobility, is not efficient to offer low latency handoff in the case of nested mobile networks because it produces a long transfer delay and excessively large...
Throughput and per-packet delay can present strong trade-offs that are important in the cases of delay sensitive applications. We investigate such trade-offs using a random linear network coding scheme for one or more receivers in single hop wireless packet erasure broadcast channels. We capture the delay sensitivities across different types of network applications using a class of delay metrics based...
Sufficient computing resources available at future generation routers in the access/aggregation networks can be pooled to form a cloud at edge, which we call Access/Aggregation Network Cloud (or ANC). An ANC can be used to handle some of the information processing conventionally done inside the enterprise networks. ANC computing can also result in a much less delay and more flexibility than if such...
The non-recurrent congestion caused by incident happens frequently in urban traffic network and influences normal operation of traffic system greatly, so that studying on congestion control strategies under propagation of non-recurrent congestion is very important. The aim of this dissertation is to investigate the spatio-temporal distribution of traffic flow and location of variable message sign...
In this paper, multicast routing is studied for the networking of decentralized sensors and controllers in cyber physical systems. The challenge of system stability awareness is addressed by employing the theory of linear matrix inequalities, thus forming a novel framework for studying the communi- cation sub-system in cyber physical systems. Both cases of ignorable delay and non-negligible delay...
Opportunistic or Delay Tolerant Networks (DTNs) may be used to enable communication in case of failure or lack of infrastructure (disaster, censorship, remote areas) and to complement existing wireless technologies (cellular, WiFi). Wireless peers communicate when in contact, forming an impromptu network, whose connectivity graph is highly dynamic and only partly connected. In this harsh environment,...
Many applications, such as product promotion advertisement and traffic congestion notification, benefit from the opportunistic content exchange in Delay Tolerant Networks (DTNs). An important requirement of such applications is timely delivery. However, the intermittent connectivity of DTNs may significantly delay content exchange and cannot guarantee timely delivery. The state-of-the-arts capture...
Considering physical sensors with certain sensing capabilities in an Internet-of-Things (IoT) sensory environment, in this paper, we propose an efficient energy management framework to control the duty cycles of these sensors under quality-of-information (QoI) experience in a multi-task-oriented IoT sensory environment. Contrary to past research efforts, our proposal is transparent and compatible...
Network resources are often limited, so how to use them efficiently is an issue that arises in many important scenarios. Many recent proposals rely on a central controller to carefully orchestrate resources across multiple network locations. The central controller gathers network information and relative levels of usage of different resources and calculates optimized task allocation arrangements to...
Platooning of vehicles allows to saving energy and increasing safety provided that there are reliable wireless communication protocols. In this paper, the optimization of the medium access control (MAC) protocol based on IEEE 802.11e for the platoon joining is investigated. The exchange of prosperous dynamic information among vehicules through certain bounded and closed-fitting timeout windows is...
The concept of energy efficiency for data driven applications is proposed in this paper as a relationship between energy dissipation and throughput delay, on equal amounts of data processed, defined as energy per bit and bit rate. We investigated several degrees of parallelism in circuits with the same functionality in terms of delay and energy consumption. We modeled two scenarios in data driven...
This paper concentrates on the problem of minimizing network coding resources with end-to-end delay and delay variation constraints in multimedia network. Network coding resources optimization problem has proved to be NP-hard, and the introduction of delay constraints makes it more complicated to be solved, since essentially the single problem of constructing such delay constrained tree without combining...
There is little understanding about how network applications can benefit from mathematical/heuristic optimization techniques, such as cross-layer design. We propose CLASS, a component-based framework for evaluating and comparing network optimization techniques, such as cross-layer design. CLASS uniquely integrates network optimization with high-fidelity simulation to provide an “optimize-and-verify”...
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