introduction: quality of services extremely depends on how personnel have contact and interaction with the clients. moreover, the personnel’s attitudes and their behaviors with the clients significantly affect clients’ perception of quality of services and consequently influence their satisfaction as well as their absorption to the services of an institution. this study intends to investigate t...

the strength of concrete is a function of the proportions of the constituent materials, namely, cement, water, fine and coarse aggregates. the conventional methods used to determine the mix proportions that will yield the desired strength, are laborious, time consuming and expensive. in this paper, a mathematical method based on modified regression theory is formulated for the prediction of con...

Fundamental tradeoffs in green cellular networks with coexistence of machine-oriented and human-oriented traffics are investigated. First, we present a queuing system to model the uplink transmission of a green base station which serves two types of distinct traffics with strict requirements on delay and battery lifetime. Then, the energy-lifetime and energydelay tradeoffs are introduced, and c...

Vehicular ad hoc networks (VANETs) that use the IEEE 802.11p communication standard face a number of challenges, not least when it comes to safety messages on the VANET control channel (CCH) where short delay times and reliable delivery are of pri⁃ mary importance. In this paper we propose a vehicular machine⁃to⁃machine (VM2M) overlay network that uses Long Term Evolu⁃ tion (LTE) physical rando...

Introduction: Knowledge of the network state allows transcoder adaptation of a pre-encoded video bit rate by varying the re-quantization parameter. In TCP-Friendly Rate Control (TFRC) [1], which is now an RFC, an equation captures the network state, determining congestion primarily from packet loss events. However, packet loss of intra-coded pictures leads to progressive deterioration of a vide...

This paper proposes an approach for the minimum time swing upof a rotary inverted pendulum. Our rotary inverted pendulum is supported bya pivot arm. The pivot arm rotates in a horizontal plane by means of a servomotor. The opposite end of the arm is instrumented with a joint whose axisis along the radial direction of the motor. A pendulum is suspended at thejoint. The task is to design a contro...

This paper presents a method of optimized PID parameter self-adapted ant colony algorithm with aberrance gene, based on ant colony algorithm. This method overcomes genetic algorithm’s defects of repeated iteration, slower solving efficiency, ordinary ant colony algorithm’s defects of slow convergence speed, easy to get stagnate, and low ability of full search. For a given system, the results of...

in this paper, dynamical behavior of the delay mechanism of a special projectile controller is studied, using 3d finite element simulation. the controller considered here is among of high-acceleration mechanical controllers. due to high linear and angular accelerations of the projectile and also explosion risk, experimental investigation is very limited and almost impossible. so, numerical simu...