A novel bi-objective multi-server location-allocation (LA) model is developed in this paper, in which the facilities are modeled as an M/M/m queuing system. Further, capacity and budget limitations are provided to make the LA problem more realistic. The two objective functions include (1) minimizing aggregate waiting times and (2) minimizing the maximum idle time of all facilities. Since the pr...

We propose that the salient feature to be explained about the glass transition of supercooled liquids is the temperature-controlled superArrhenius activated nature of the viscous slowing down, more strikingly seen in weakly-bonded, fragile systems. In the light of this observation, the relevance of simple models of spherically interacting particles and that of models based on free-volume conges...

Most prior work on congestion in datagram systems focuses on buffer management. We find it illuminating to consider the case of a packet switch with infinite storage. Such a packet switch can never run out of buffers. It can, however, still become congested. The meaning of congestion in an infinite-storage system is explored. We demonstrate the unexpected result that a datagram network with inf...

The transition between low and high density phases is a typical feature of systems with social interactions. This contribution focuses on simple evacuation design of one room with one entrance and one exit; four passing-through experiments were organized and evaluated by means of automatic image processing. The phase of the system, determined by travel time and occupancy, is evaluated with resp...

The network delay has a huge impact to the quality of a networked control system. This paper investigates modelling the network delay incurred by control system packets traversing a Mobile Ad Hoc Network from a plant to a controller using the queuing theory. Control systems can become unstable if information is lost or delayed so in this paper we compare voice traffic modelling with control pac...

The evolution of European mobile communication systems towards the third generation (3G) is based on GSM (Global System for Mobile communications) [1]. A first step in the evolution is the General Packet Radio Service (GPRS) [2], [3], which truly supports packet switched data services. Our goal is to investigate the efficiency of different algorithms used for resource allocation in data transfe...

In the complex railway networks characterized by mixed traffic, a key focus is increase of capacity high-performance signaling systems, including ETCS/ERTMS and beyond. Nevertheless, estimation effects on headway introduction innovations in systems not consolidate for networks. This study highlights several challenges line-node calculation congested considering combined effect routes conflicts ...

This article is concerned with the analysis of one-dimensional compressible Euler equations a singular pressure law, so-called hard sphere equation state. The result twofold. First, we establish existence bounded weak solutions by means viscous regularization and refined compensated compactness arguments. Second, investigate smooth setting providing detailed description impact on breakdown solu...

The Braess paradox, known for traffic and other classical networks, lies in the fact that adding a new route to a congested network in an attempt to relieve congestion can degrade counterintuitively the overall network performance. Recently, we have extended the concept of the Braess paradox to semiconductor mesoscopic networks, whose transport properties are governed by quantum physics. In thi...

A new cellular automaton (CA) model is proposed to simulate traffic dynamics in urban two-way road network systems. The NaSch rule is adopted to represent vehicle movements on road sections. Two novel rules are proposed to move the vehicles in intersection areas, and an additional rule is developed to avoid the "gridlock" phenomenon. Simulation results show that the network fundamental diagram ...