The pole assignment method for non-delay multivariable systems has received a great deal of attention for designing feedback controllers to achieve desired objectives [1], [2]. Suh and Bien [3] have considered a root locus technique for linear systems with time-delay. Here is an attempt to present a pole assignment method for multi-input systems with input delay. The single-input system with de...

The robust stability analysis of asynchronous and uncertain sampled-data systems with constant incremental input delay is addressed in the looped-functional framework. These functionals have been shown to be suitable for the analysis of impulsive systems as they allow one to express discrete-time stability conditions in an affine way, enabling then the consideration of uncertain and time-varyin...

This work presents a new discrete-time adaptive-predictive control algorithm for a system with force disturbance and input delay. This scenario is representative of a mechatronic device for percutaneous intervention with pneumatic actuation and long supply lines which is controlled remotely in the presence of an unknown external force resulting from needle-tissue interaction or gravity. The ult...

This study compared the corneal and total higher order aberrations between the fellow eyes in monocular amblyopia. Nineteen amblyopic subjects (8 refractive and 11 strabismic) (mean age 30 ± 11 years) were recruited. A range of biometric and optical measurements were collected from the amblyopic and non-amblyopic eye including; axial length, corneal topography and total higher order aberrations...

PURPOSE To obtain experimental values of the depth-of-field (DOFi) of the human eye for different accommodative states. METHODS First, the monochromatic ocular wavefront of seven eyes from young subjects (mean [±SD] age, 29.7 [±7.7] years) was measured at eight different accommodative demands (ADs) (from -1 to 6 diopters [D] in steps of 1 D). Then, in a second part, accommodation was paralyze...

AIM To describe preliminary findings of how the profile of the use of blur, disparity, and proximal cues varies between non-strabismic groups and those with different types of esotropia. DESIGN This was a case control study. METHODOLOGY A remote haploscopic photorefractor measured simultaneous convergence and accommodation to a range of targets containing all combinations of binocular dispa...

purpose: to study the prevalence and characteristics of accommodative esotropia (aet). methods: in a descriptive analytic study records of all patients referred from 1383 to 1388 to the strabismus clinic at nikookari eye center were reviewed and demographic data such as age, gender, refractive error, type of aet, mean deviation and amblyopia were analyzed. results: a total of 2,146 patients wer...

This chapter discusses the positive effects of IT investment on firm financial performance when a distinct range of characteristics is examined. The relationship between IT investment and firm performance considering the information intensity of the industry is explored using a distributed lag model. Findings indicate both a positive effect and a positive lag effect of IT investment. The effect...

Myopia is considered to be a leading cause of visual impairment. Furthermore, the prevalence of myopia in young adolescents has increased substantially over the past few decades. Although myopia was identified more than two thousands years ago, a consistently effective approach to myopia control for all patients still eludes clinicians. Among all the treatments mentioned in this review, the mos...

Purpose: In the clinical care of functional vision disorders, dynamic retinoscopy such as Monocular Estimate Method has been the mainstay for objective measurement of the accommodative response. It is valuable, fast and widely available. Dynamic retinoscopy however does not allow for quantified measures of accommodation by inexperienced clinicians or technicians. Automated, objective methods fo...