نتایج جستجو برای: geographical data systems
تعداد نتایج: 3357917 فیلتر نتایج به سال:
Abstract In this paper, an efficient approach to data validation of distributed geographical interlocking systems (IXLs) is presented. the IXL paradigm, track elements are controlled by local computers communicating with other control components over and wide area networks. The overall logic these track-side remote server that may even reside in one or more cloud farms. Redundancy introduced en...
the study of air infiltration into the buildings is important from several perspectives that may be noted to energy and design of hvac systems, indoor air quality and thermal comfort and design of smoke control systems. given the importance of this issue, an experimental and numerical study of air infiltration through conventional doors and windows has been explored in iran. to this end, at fir...
Coordination is becoming an increasingly important paradigm for systems design and implementation. With multiple languages and models for coordination emerging, it is interesting to compare different models and understand their strengths and weaknesses find common semantic models and develop mappings between formalisms. This will help us to gain a deeper insight into coordination concepts and a...
growing demands and requires of high data rate systems cause significant increase of high frequency systems for wideband communication applications. as mixers are one of the main blocks of each receivers and its performance has great impact on receiver’s performance; in this thesis, a new solution for ku-band (12-18 ghz) mixer design in tsmc 0.18 µm is presented. this mixer has high linearity a...
different researchers in different parts of the world have investigated the strategies used to translate written works ranging from novels to classroom assignments. however, by the significant increase in the number of postgraduate students in iran in the last few years, a very common kind of translation in iran includes translating abstracts of master’s theses. in this work, the researcher hav...
An overview of the fields of data modelling, database systems and geographical information systems is presented as a background. Requirements to a data model and a data modelling methodology for geographical data are investigated and presented. Another contribution is an extension of the traditional ER-diagrams to better communicate the semantics of geographical data. The approach is based on e...
In the eld of geography, we have beenexamining the contribution of the morpho-genetic rep-resentation to the comprehension of the cycle: reality,representation, model, reality. A distinction is madebetween map and geomap based on the notion of locus-object. 1. Foundations and limits of cartographic rep-
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