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Testing and improving commercial traffic software remain as important research topics in the last three decades. Many previous approaches emphasized the driving behaviors of uninterrupted flows (e.g. car-following and lane-changing features) but paid less attentions to the driving behaviors of interrupted flows. In the paper, the distribution of reproduced departure headways at signalized intersection...
Traditional three-dimensional fuzzy controller for over more fuzzy rules is difficultly designed and used, a mixed controller combined Fuzzy control with PID control is proposed in this paper. This strategy uses three one-dimensional fuzzy controllers respectively being deviation, deviation change and deviation's deviation change by weighting fusion for forming the M-type controller. It solves the...
A four-node wireless network model is designed based on NS2 simulation platform software. The network performance, such as System delay, Packet loss rate, Throughput and other key indicators are simulated in this paper. By running of TCP and UDP protocols, we make the analysis and evaluation to network performance from different aspects, and then, associated parameters were compared graphically with...
Processor cores in a chip multiprocessor (CMP) typically share a large last-level cache and the off-chip memory bandwidth. Previous studies demonstrate that explicit cache capacity and off-chip bandwidth partitioning can yield better overall system performance than without partitioning. However, little work has been done to study the interaction between cache capacity partitioning and off-chip bandwidth...
This paper deals with a approximating method for large time-delays of multi-input multi-output (MIMO) dynamical systems. The methodology is an improved rational approximation approach. Time delay terms of the state space equations can be described by delay matrix in the complex domain and approximated by rational matrix Pade-type functions. The minimum variance estimation error is minimized to obtain...
This paper presents an enhanced version of a proposed extension of the RTP/RTCP standard protocols to acquire Inter-Destination Multimedia Synchronization (IDMS) in one-way distributed applications. Several dynamic policies for selecting the master reference play out point to synchronize are introduced and their suitability is analyzed, for specific network conditions and application requirements,...
This paper studies the left-turn of non-power-driven vehicles in the condition of little interference to motor vehicles at signal intersections, and puts forward an oblique way crossing the street for left-turn non- power-driven vehicles. It first compares the oblique crossing way with the traditional left-turn of non- power-driven vehicles through an example. Then makes a simulation by means of VISSIM...
The rapid growth of wireless networks makes cognitive coexistence an important technology to use the spectrum efficiently. In this paper, a novel sensing based delay optimal method is considered to meet the requirement of the delay-sensitive traffics as well as to minimize the collision between the primary user and the secondary user. After establishing the Markov Decision Process (MDP) model, we...
Packet scheduling is key to QoS capabilities of broadband wired and wireless networks. In a heterogeneous traffic environment, a comprehensive QoS packet scheduler must strike a balance between flow fairness and access delay. Many advanced packet scheduling solutions have targeted fair bandwidth allocation while protecting delay-constrained traffic by adding priority queue(s) on top of a fair bandwidth...
Many MAC protocols have been proposed for underwater sensor networks, usually variants of well-known terrestrial approaches. Although performance comparisons among different MAC protocols have been estimated by simulations, e.g. [1], [2], no extensive comparison has yet been performed by means of at-sea experiments. Simulations can only capture a subset of the total environmental variability, resulting...
Cooperative wireless networks supporting multiple services necessitate the application of a robust bandwidth allocation policy to ensure Quality of Service (QoS) provision to different applications. In this work, a load dependent bandwidth allocation technique is presented considering traffic priority and buffer load in the relay nodes of a cooperative communication network. An analytical approach...
Stochastic network calculus provides an elegant way to characterize traffic and service processes. However, little effort has been made on applying it to multi-access communication systems such as 802.11. In this paper, we take the first step to apply it to the backlog and delay analysis of an 802.11 wireless local network. We found the derived bounds are very loose in comparison to ns-2 simulation...
Based on the target gasoline engine, a first-order with delay throttle-speed model is built from the step response experiment. Then the PID controller parameters are tuned by the internal model control (IMC) design methodology. Although simulation is good, experiment results are not ideal for multi-speed references. To enhance the speed regulator's robustness, the integral sliding mode control (ISMC)...
Considering the network-induced delay existed in the network control systems, a simple simulation is required firstly to understand the effect of network-induced delay on system performance, the delay is inevitable, which can degrade the performance of control system and even destabilize the system, so it is necessary for us to study this problem. Secondly, the modeling of networked control systems...
Due to the massive use of parallel and distributed operations of inputs and outputs, iterative scheduling algorithms are attractive in finding a maximal size matching for an input-queued switch. For constructing a large high-speed switch, a distributed multi-chip implementation of an iterative scheduling algorithm should be followed. Since different chips may locate on different switch linecards and...
In recent years, growth in the demand for emergency medical services has raised concerns about improving patient flow via operational techniques and strategies. Health care delivery is a very special service process involving complex human activities and real time decision making. Especially, emergency departments (EDs), as the gateway and the major source of outpatients in hospitals, have experienced...
In this paper, we consider the medium access control (MAC) protocol design for cognitive radio networks. An opportunistic spectrum access protocol named Slotted CR-ALOHA is proposed, and its performances in terms of normalized throughput and average packet delay are evaluated. Simulation results show that for various frame lengths and number of SUs, the optimal performance can be achieved at an appropriate...
Peer-to-peer file sharing techniques are efficient and popular ways to distribute network media contents. Aiming to improve the accessibility of media contents from mobile devices, we introduce peer-to-peer file sharing technique into delay tolerant networks (DTNs), which are formed solely by highly mobile devices and which distribute files utilizing the mobility of humans and vehicles. We first investigate...
A method for fault detection of networked control systems with network-induced delay is studied in this paper. In the method, a discrete-time model is used to describe the dynamic behavior of the networked control systems, the network-induced delay is supposed to be smaller than sampling period. First, a known structure matrix of network-induced delay is obtained by eigendecomposition, and then residual...
This paper is focused on the electric power management required on garages where plug-in vehicles are located. As the Electric Vehicle technology becomes more efficient and sophisticated, parking infrastructures should be analyzed as new potential high concentrated electric consumption nodes. Simulation techniques have been implemented to analyze possible benefits of implementing a consumption management...
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