نتایج جستجو برای: digital
تعداد نتایج: 307822 فیلتر نتایج به سال:
Background and Aims: Accurate diagnosis of vertical root fracture (VRF) is a fundamental importance in endodontics. Because of poor prognosis of VRF, digital radiographs with two horizontal angles have limitations in VRF detection. Also, Gutta-percha can produce artifacts that impair CBCT scan accuracy. The aim of this study was to compare accuracy of CBCT and digital radiography system in vert...
In this paper, a new approach using gradient optimization algorithm for delay locked loop (DLL) is provided. Among the salient features of this structure, the proposed DLL can be quickly locked and can be used as a high-frequency circuit. In this novel architecture a digital signal processor (DSP) is used instead of phase detector, charge pump and loop filter. In digital transmitters to select ...
In the architectural design, designers are focused on the early stages of the design process or conceptual design. The ultimate goal of this stage is to find a solution for an existing problem, investigate design space, or explore an idea. This stage conventionally begins with sketches and diagrams to explore ideas and solutions; the ambiguity and vagueness of conventional freehand sketching ca...
Development of information technology and entrance to digital millennium confronted Copyright system with some serious challenges so that in some cases, protection of creators of digital works and protection of artistic and literary works in digital and cyber space and performance of this works in that space is in doubt. In order to removing this concerns and protection of copyright a...
Abstract Digital architecture, as a proceeding architectural style, has caused fundamental evolutions in architectural design and building appearance via applying complex geometries and topologies. Computers and digital tools have truly altered the design process and architectural conception facilitating production of new eye catching forms. Avant-garde architectural forms have emerged from the...
The usage of digital radiology systems with insufficient quality control of digital image detectors can efface inherent superiorities of digital systems in comparison with analogue radiology systems and even makes an increased level of patients’ radiation doses. Modulation transfer function (MTF) is one of the most important parameters related to image quality and digital detectors efficiency. ...
In this paper, the digital controller design for compensating the dc-dc buck converter output voltage has been analyzed in the digital domain. The main idea of this paper is patterning the samples of high order ideal controller and using integral square error in determining digital PID coefficients. This approach provides higher precision of digital controller design and eliminates the need for...
The aim of this study is to identify the goals of governmental organizations in developing digital libraries. The used methodology is Grounded Theory. This study used three step systematic method of the mentioned research method. Interview with 11 digital library managers help us to collect data. The collected data filtered by coding steps and demonstrated by Paradigm model. Results showed that...
background and aims. the aim of the present study was to compare the effect of application of an image processing mode of a colorizer on the efficacy of the detection of interproximal carious lesions viewed in direct digital radiography. materials and methods. a total of 102 proximal surfaces of extracted human premolars on direct digital images were evaluated by three observers with and withou...
Background: Digital Nanning is a style of care that digital devices replaced by child active relationship with environment and child are exposed to permanent digital devices. Children who had been exposed to direct digital nanning for several hours from a very young age, losing the opportunity to interact with the mother or caregiver and do not get rich environment that are necessary for normal...
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