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The paper proposes a methodology to model and simulate a medium scale distribution network with several feeders in a real-time multi-core environment. Due to the small length of the lines, this type of simulation is still quite challenging especially when several cores are addressed to compute the simulation. Problems of model conditioning for multi-core computing are discussed. Validation results...
Both of Quality of Service (QoS) and Quality of Experience (QoE) are defined to specify the degree of service quality. Although they are dealt with in different layers in multi-layered models, collaboration of these is necessary to improve the user satisfaction for telecommunication services. In this paper, after sorting out the concepts and specification of QoS and QoE, a service quality coordination...
Managed software development organizations are de facto closed loop systems, in which management actions influence future behavior based on observations of previous behavior thus forming a closed feedback loop. It is well known from control theory that a closed loop system might exhibit dynamics very different from the dynamics of its open loop components. Therefore, it is the goal of this work to...
Wireless channel in metal environment is widely used in industrial, scientific and real life application, such as workshop, automobile, satellite, airplane, computer chassis and so on. It is quite different from that in traditional environment because of its strong reflection and weak absorbing. In this paper, we present a measurement of UWB-based channel in a computer chassis by sweeping in the frequency...
In this paper, we consider several control loops sharing a common computation or communication resource. We assume the presence of a scheduler that approximates a fluid flow temporal partitioning of the resource among the different tasks. The goal of this paper is to expose the relation between the amount of resources allocated to each loop (Quality of Service) and the Quality of Control resulting...
A population growth model that represents the growth trajectories of individual subjects is critical to study and understand neurodevelopment. This paper presents a framework for jointly estimating and modeling individual and population growth trajectories, and determining significant regional differences in growth pattern characteristics applied to longitudinal neuroimaging data. We use non-linear...
We consider algorithms for a multicore environment in which each core has its own private cache and false sharing can occur. False sharing happens when two or more processors access the same block (i.e., cache-line) in parallel, and at least one processor writes into a location in the block. False sharing causes different processors to have inconsistent views of the data in the block, and many of...
Cloud computing is an increasingly important solution for providing services deployed in dynamically scalable cloud networks. Services in the cloud computing networks may be virtualized with specific servers which host abstracted details. Some of the servers are active and available, while others are busy or heavy loaded, and the remaining are offline for various reasons. Users would expect the right...
The Elmore delay has been the metric of choice for the performance driven design applications. But the accuracy of the Elmore delay is insufficient. This paper presents an accurate and efficient model to compute the delay metric of on-chip high speed VLSI interconnects for ramp inputs. The proposed delay metric is based on the distributed RC interconnect model. For optimization like physical synthesis...
Mobile and multimedia applications are more and more used in the current Internet. For these applications, a set of Transport protocols are proposed aimed at aiding the end-to-end communication. However, to face the challenge of providing a sufficient Quality of Service (QoS) to the final users, a new generation of Transport protocols that takes into account dynamically and autonomously the evolvement...
Prefix computation is one of the fundamental problems that can be used in many applications such as fast adders. Most proposed parallel prefix circuits assume that the circuit is of the same width as the input size. In this paper, we present a class of parallel prefix circuits that perform well when the input size, n, is more than the width of the circuit, m. That is, the proposed circuit is an almost...
Cloud computing is a highly scalable distributed computing platform in which computing resources are offered 'as a service' leveraging virtualization. Cloud Computing distributes the computational tasks on the resource pool which consists of massive computers so that the service consumer can gain maximum computation strength, more storage space and software services for its application according to...
In this work, we consider a passive optical network (PON) with reduced buffer capacity at the Optical Network Unit (ONU). The objective is to reduce the ONU power consumption by having smaller buffers. This requires that some of the end-nodes packets be buffered at the end-node itself (EN) and some buffered at the ONU. These packets will be used to fill the upstream transmission time slot allotted...
Groups of people with mobile phones using short range connections like WiFi and Bluetooth to propagate messages can be modeled as, with regard to regular absence of end-to-end connection, Delay Tolerant Networks (DTNs). The study of message transmission speed in such kind of networks has attracted increasing attention in recent years. In this paper, we present a realistic framework to model the message...
The subthreshold circuit is a promising ultra-low-power solution for such applications that don't require high speed but are extremely power-stringent. The characteristic of the current under subthreshold voltage is different from the normal domain. A delay model is essential to predict the performance, analyze the variation impacts and optimize the design. This paper proposes a fast computable delay...
Due to increased on-chip power density, multi-core systems face various thermal issues. In particular, exceeding a certain threshold temperature can reduce the system's performance and reliability. Therefore, when designing a real-time application with non-deterministic workload, the designer has to be aware of the maximum possible temperature of the system. This paper proposes an analytic method...
Several recent works consider the problem of temperature-constrained scheduling of jobs. In such attempts, speed of the processor and the execution of jobs is software-controlled such that temperature and performance constraints are met. An alternative approach is to use measurements from temperature sensors to actuate the speed of the processor as a feedback control loop. Though such a solution explicitly...
Based on the Instantaneous Stopped Delay (ISD), this paper proposed a novel closed-loop feedback signal control strategy, which takes the total amount of ISD (ISD Total) as input detector data for measurement frame-by-frame in traffic flow video, and realizes real-time switches of the signal status when the amount reaches the threshold, and adaptively distributes the green interval to the most needed...
Newer link-layer protocols - including Energy Efficient Ethernet (EEE) - support a sleep mode to save energy during idle periods. Bursting or coalescing of packets can be used to reduce the overhead from sleep-wake transitions for such links. We develop an energy-delay model for a coalescing queue given deterministic interarrival and service times. We also model the delay of a downstream queue. The...
Reversible logic has become one of the most promising research areas in the past few decades and has found its applications in several technologies; such as low power CMOS, nano-computing and optical computing. Reversible logic gates are widely known to be compatible with future computing technologies which virtually dissipate zero heat. Adders are fundamental building blocks in many computational...
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