introduction using ionization radiation for diagnostic and treatment fields has increased worldwide dramatically. this issue causes an increase in the absorbed and collective doses in society noticeably. with regard to two main principles in radiation protection, i.e., justification and optimization, it is necessary to have imaging process with minimum dose to patients and personnel. for achiev...

Introduction Using ionization radiation for diagnostic and treatment fields has increased worldwide dramatically. This issue causes an increase in the absorbed and collective doses in society noticeably. With regard to two main principles in radiation protection, i.e., justification and optimization, it is necessary to have imaging process with minimum dose to patients and personnel. For achiev...

Introduction Quality control (QC) techniques are used in monitoring and maintenance of the components of an x-ray system. QC of radiology devices plays a significant role in reduction of medication dose and optimization of image quality. This study aimed to conduct QC tests on randomly selected radiology devices, installed in diagnostic imaging departments of Iran. Materials and Methods In tota...

introduction quality control (qc) techniques are used in monitoring and maintenance of the components of an x-ray system. qc of radiology devices plays a significant role in reduction of medication dose and optimization of image quality. this study aimed to conduct qc tests on randomly selected radiology devices, installed in diagnostic imaging departments of iran. materials and methods in tota...

We propose a mechanism and sys tem f o r the automatic generation of interactive mult imedia presentat ions f r o m their specifications. A presentat ion specifica(5on contains three parts: the resources, the temporal in format ion , and the spatial information. We use a ICON programming technique and a graphical user interface d l o w the presentation designer t o quickly specify what he/sh.e ...

W e are concerned wi th providing support for a range of object oriented programming langauges t o be used in mult i -user , mult i -machine, heterogeneous env ironments requiring associative access, as well as concurrency and storage management . I n order t o operate in this environment the implementat ions of current object oriented languages m u s t however be extended. Our goal is t o prov...

Direct-sequence code-division mult ip le access (DS-CDMA) is a popular wireless technology. in DS-CDMA communications, all of the users’ signals overlap in t ime and frequency and cause mutual interference. The conventional DS-CDMA detector fo l lows a single-user detection strategy in which each user is detected separately w i thou t regard for the other users. A better strategy is mult i-user...

Due t o the demand f o r high-speed and mult imedia services, A T M (asynchronous t rans fer mode) networks have increasingly received high at tent ion. T h e multzmedia services i n A T M networks have diverse t r a f i c characteristics and service requirements, appropriate traffic controls of call admission and congestion are needed so as t o guarantee the required quality of servace (00s) f...

1 I n t r o d u c t i o n In previous papers the multi-parent scanning crossover and diagonal crossover were tested on numerical optimization problems, [3, 4, 5]. These tests were performed on a test suite of common EA test functions, still they were chosen somewhat arbitrarily, moreover the types of fitness landscapes they span are difficult to characterize. I t was therefore not possible to l...

In this note all rings are commutat ive rings with identity and all modules are unital. Let R be a commutat ive ring with identity. An R-module M is called a mult ipl icat ion module provided for each submodule N of M there exists an ideal I of R such that N = I M. Various propert ies of mult ipl icat ion modules are considered. If there is a common theme it is that the methods used generalise ...