In the problem of Online Call Admission in Optical Networks, briefly called oca, we are given a graph G = (V,E) together with a set of wavelengths W (χ := |W |) and a finite sequence σ = r1, r2, . . . of calls which arrive in an online fashion. Each call rj specifies a pair of nodes to be connected. A lightpath is a path in G together with a wavelength λ ∈ W . Upon arrival of a call, an online ...

Purpose This research aims to identify the optimal configuration of investment which leads firms their best competitive positions, considering degree concentration in market. Design/methodology/approach The methodology was quantitative and based on secondary data with samples 124, 106 90 from environment classified as perfect competition, monopolistic competition oligopoly, respectively. Propos...

In this paper, a hybrid inverse distance weighted (IDW) and the imperialist competitive algorithm (ICA) was proposed for grade estimations in mining projects. Indeed, coefficients of IDW equation, power, influence were modified by applying ICA algorithm. For this, an example solved using IDW, ordinary kriging, IDW-ICA. After successfully validating IDW-ICA, iron grades estimated Baba Ali mine, ...

abstract: this paper presents dynamic modelling and control of a linear prismatic series of elastic actuator. the capability of generating large torques is why this actuator is increasingly used in human-assistive robotic systems. due to having human in the loop, the actuator requires precise control. a fractional pid controller known for its improved performance is used for the control, due to...

the spatial distribution of petrophysical properties within the reservoirs is one of the most importantfactors in reservoir characterization. flow units are the continuous body over a specific reservoirvolume within which the geological and petrophysical properties are the same. accordingly, anaccurate prediction of flow units is a major task to achieve a reliable petrophysical description of a...

this paper presents a novel indirect adaptive power system stabilizer (pss) via a developed synergetic control methodology and fuzzy systems. fuzzy system is utilized in an adaptive scheme to estimate the system using a nonlinear model. the synergetic control guarantees robustness of the controller and makes the controller easy to implement because of using a chatter free continuous control law...

We consider max coloring on hereditary graph classes. The problem is defined as follows. Given a graph G = (V, E) and positive node weights w : V → (0,∞), the goal is to find a proper node coloring of G whose color classes C1, C2, . . . , Ck minimize k ∑ i=1 maxv∈Ci w(v). We design a general framework which allows to convert approximation algorithms for standard node coloring into algorithms fo...

toodeh party was one of the organized parties in the first days of iran's islamic revolution. this party began its cooperation with the revolutionary forces after 16th polonium and nooraldin kianoori's election as its first secretary. its support from imam khomeini's leadership and the revolution was based on its analysis and understanding of the socio-political forces' posi...