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The paper addresses the problem of inventory control in production-inventory systems stressing the dynamical aspects of stock replenishment process. In the considered systems, the stock used to satisfy the unknown, time-varying demand can be refilled from multiple supply sources. The orders issued in each review period are realized with delay, which differs among the suppliers and transport alternatives...
In this paper, an integrated methodology is developed for optimizing inspection and maintenance of a component where delayed repair is considered to be one of feasible options. The models of failures, risk and life cycle cost are developed using probability, stochastic process and the delay time concept. The model is intended to optimise the inspection intervals and the delay of repair simultaneously...
In this paper, we present a delay-dependent robust model predictive control (MPC) algorithm for a class of discrete-time linear state-delayed systems subjected to polytopic-type uncertainties and input constraints. The state-feedback MPC law is calculated by minimizing an upper bound of the worst-case quadratic cost function over an infinite time horizon at each sampling instant. In contrast to existing...
This paper presents a cross-layer approach for optimizing the delay performance of a multiuser diversity system with heterogeneous block-fading channels and a delay-sensitive bursty-traffic. We consider the downlink of a time-slotted multiuser system employing opportunistic scheduling with fair performance at the medium access (MAC) layer and adaptive modulation and coding (AMC) with power control...
In this paper, we study the weighted sum rate (w-rate) maximization algorithms with proportional rate fairness (PRF) and delay constraints for the downlink orthogonal frequency division multiple access (OFDMA) system. First, based on the Lagrangian duality optimization tool, we design a weighted sum rate maximization scheme based on instantaneous transmit power and bit error rate (BER) constraints...
This paper investigates the retailer's optimal inventory policy under supplier credits including cash discount and partially or fully permissible delay in payments depending on retailer's payment time. One theorem is developed to efficiently determine the optimal replenishment and payment policy for the retailer. Finally numerical examples are shown to illustrate the results in the paper.
The Reliable Server Pooling (RSerPool) architecture is the IETF's new standard for a lightweight server redundancy and session failover framework to support availability-critical applications. RSerPool combines the ideas from different research areas into a single, resource-efficient and unified architecture. Server pools are maintained by redundant management components, which are called registrars...
A novel delay system approach to network-based control is presented in this paper. The induced delays in networked control systems (NCS) with random access networks are usually non-Gaussian random variables, in addition, the noises in NCSs are probably non-Gaussian random variables as well. Consequently, the controller is designed based on the recently developed stochastic distribution control strategies...
Delay Tolerant Networks (DTNs), in which contacts between nodes come and go over time, is a promising approach to model communications in mobile ad-hoc networks, where scenarios of network partitioning and node disconnections are likely to happen. One of the most important challenges in such networks is how to route information and schedule transmissions, coping with the continuously changing network...
While prior research has extensively evaluated the performance advantage of moving from a 2D to a 3D design style, the impact of process parameter variations on 3D designs has been largely ignored. In this paper, we attempt to bridge this gap by proposing a variability-aware design framework for fully-synchronous (FS) and multiple clock-domain (MCD) 3D systems. First, we develop analytical system-level...
Considering process variability at the behavior synthesis level is necessary, because it makes some instances of function units slower and others faster, resulting in unbalanced control steps and reducing the attainable frequency of the circuit. To tackle this problem, this paper proposes a methodology to replace the edge-trigged flip-flops by transparent latches, to exploit latches' extra ability...
For the search of the optimal path and the establishment of the multicast tree which meets QoS constraints in multicast routing, an improved ant colony algorithm is proposed in the paper. In the searching process, two group ants carry out searching separately and alternate information after one search to avoid stagnation. And the optimal one is selected from the two paths combining multi-constrained...
An analytical model has been developed to determine the suitable value of the fold k of a k-fold multicast network with different traffic loads under Poisson traffic with finite queue. We have derived stationary probability distribution for the network states and then derived expressions for the throughput, blocking probability and the probability of delayed service of the network. It has been found...
With the multiplication of wireless communication networks and the increasing capabilities of the user devices equipped with multiple technology interfaces, being always connected tends to be a reality in the near future. In this article we propose to pilot the current weak handover algorithms using an autonomic agent-based piloting system. We specifically focus on the pre-execution handover process...
This paper provides a tutorial treatment of recent stochastic network optimization techniques, including Lyapunov network optimization, backpressure, and max-weight decision making. A new technique of place holder bits that improves delay for networking problems with general costs is also presented. An example application is given for the problem of energy-aware scheduling and routing in a wireless...
Optical burst switching (OBS) has been proposed to be a technology for implementing the next generation optical Internet. In this architecture, burst assembly algorithms have an important influence in the traffic pattern that characterizes this sort of optical networks. On the other hand, traffic coming from new applications (such as video on demand, Voice over IP, online gaming or Grid services)...
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