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In spite of recent advances in Intelligent Transport, vehicular traffic dynamics are still hard to represent and analyze. Most of the previous work on traffic regards highways or single lanes where vehicles interact in one dimension. Models for multi-dimensional vehicle-to-vehicle interactions and models for urban intersections are quite complicated and hardly applicable on a large scale. Nonetheless,...
Traffic is composed of different vehicle classes, each characterized by the vehicle length, the value of time (VOT) and other class-specific properties. Multi-class traffic flow models aim to capture these class-specific differences. In this paper, a multi-class model is appended with a monetary cost framework accounting for the value of time of each vehicle class, thereby enabling the computation...
Non-coherent energy detection (ED) IR-UWB receivers exhibit strong advantages in low data rate, low power and low cost applications such as RFID and Wireless Sensor Networks. However, the performance of ED receivers is usually suffered from the noise enhancement due to the large time-bandwidth product. The integration region of the receiver integrator significantly affects the bit error rate (BER)...
This paper presents two adaptive two-stage fuzzy controllers for traffic signals at isolated intersections. Firstly, a two-stage combination fuzzy controller is designed. For traffic status variables in two-stage controller leading to the inefficiency of traffic states weakening under low traffic flow, the controller introduces 0–1 combination and determines the combination of traffic status variables...
Evacuating large metropolitan areas during emergencies in an efficient manner is one of the critical concerns of most responsible agencies. Previous studies focused mainly on strategic evacuation plans or controls for passenger cars, giving inadequate attention to those pedestrians relying on transit systems or other modes. This study has developed a multimodal evacuation system for Baltimore city...
Based on GPRS Time Based Charging Gateway (TBCG) in one communication operator, the Paper analyses processing bottleneck of this module. It caused system inefficient and inconsistency of the user order data between TBCG and BOSS (Business Operation Support System). On the basis of current GPRS Charge Detail Record (CDR) processing procedure in the BOSS, it adds a new CDR processing module of GPRS...
With the process of non-functional properties research on real-time systems, resource estimation and analysis of real-time systems become a hotspot. Process Algebra is a formal method fitting for analyzing the functional properties of real-time systems, but it can not analyze the resource properties. Resource Timed Process Algebra (RTPA) proposed in this paper can handle it efficiently by extending...
This paper investigates performance tradeoffs between energy and information transfer in a relay based two-hop wireless system involving an energy harvesting receiver. The source and relay nodes of the two-hop amplify-and-forward (AF) system employ orthogonal space-time block codes along with orthogonal frequency-division multiplexing (OFDM) scheme. The joint optimal source and relay precoders over...
In this paper we propose an algorithm to achieve hard delay constraints in OFDMA systems. The resource scheduler has to ensure that delay deadlines of the packets get achieved and the resources are also not under utilized. This is a very difficult task since the channel and packet arrival in user queues are time varying in nature. The instantaneous decisions of scheduler depend on current as well...
Sensors are capable of supporting multiple applications concurrently. Recent works reveal several possibilities of running multiple applications in a wireless sensor network. In this work, we introduce the compression factor to quantify the change of the message length due to the aggregations of application messages. Delay constraints are introduced for two communication paradigms in wireless sensor...
A complex software system may have hundreds of tuning parameters with both itself and its runtime environments. To perform optimally at runtime, a self-adaptive system often needs to employ a series of controllers to tune different parameters. In most cases, these parameters are not independent but interact with each other, thus demanding effective coordination among different controllers. Due to...
Network Mobility (NEMO) is becoming an important requirement for today's and tomorrow's IP networks. NEMO can give us internet connectivity while on the move. NEMO Basic Support Protocol (BSP) has been proposed by Internet Engineering Task Force (IETF) in order to address the need of mobile networks. But NEMO BSP has some limitations like inefficient route, high latency during handoff and packet delay...
Delay is an important parameter that needs to be considered in the reversible logic designs, but not much work on delay in reversible network has been done at present. This paper presents an algorithm to calculate delay of reversible network. In the process of calculating delay, we not only take the complexity of different logic gates into consideration, but also the relationship between the output...
Future Internet research activities try to increase the flexibility of the Internet. A well known approach in this area is to build protocol graphs by connecting functional blocks together. The protocol graph that should be used is the one most suitable to the application's requirements. This paper presents a Multistep Process Model to find the most suitable protocol graph. We evaluate our proposed...
The growing market for Digital Signal Processing (DSP), Computer graphics and embedded systems applications that can be modeled as polynomial computations in their datapath designs, requires improvements in high-level synthesis and optimization techniques for such systems. This paper concentrates on how to find common sub-expressions between s given polynomial functions over Z2n1 × Z2n2 × … × Z2nd...
Context-awareness is a key requirement in many of today's networks, services and applications. Context Management systems are in this respect used to provide access to distributed, dynamic context information. The reliability of remotely accessed dynamic context information is challenged by network delay, packet drop probability, information dynamics and the access strategies taken. QoS classification...
Over 40 research projects are currently on-going worldwide aimed at designing the new architecture of the Internet. One of these projects — System IIP led in Poland — covers a wide spectrum of issues including network technologies, architectures, virtualization aspects, and applications. In this paper, we focus on implementation issues of network resource provisioning in System IIP, as well as on...
In this paper the problem of covering an area using a network of multi-agent systems in the presence of inter-agent communication delays induced by communication faults is investigated. A spatial partitioning technique is used based on the delayed information to divide the field among all agents. Then a motion coordination algorithm is proposed to drive agents in such a way that the coverage performance...
Routing path restitution approach to control and tolerate the congestion in routing models for mobile ad hoc networks is proposed in this paper. Packet loss in network routing is primarily due to link failure and congestion. The majority of present congestion control solutions do not possess the ability to distinguish between packet loss due to link failure and packet loss due to congestion. Here...
This paper discusses the robustness of nonlinear model predictive control (NMPC) based on sub-optimal solution obtained under reduced precision solution (RPS) criteria. NMPC needs to solve the optimal control problem (OCP) quickly and the input is injected to the controlled plant in time. Traditional convergence criteria in optimization algorithms usually cost excessive long computation time with...
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