نتایج جستجو برای: systems analysis

تعداد نتایج: 3758357  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی 1387

چکیده ندارد.

Journal: :iranian journal of management studies 2015
babak sohrabi mehdi toloo ali moeini soroosh nalchigar

the evaluation and selection of recommender systems is a difficult decision making process. this difficulty is partially due to the large diversity of published evaluation criteria in addition to lack of standardized methods of evaluation. as such, a systematic methodology is needed that explicitly considers multiple, possibly conflicting metrics and assists decision makers to evaluate and find...

Journal: :journal of rangeland science 2011
mohsen aliakbari mohammadreza vahabi amir saadatfar

vegetation cover over time and space is the result of interactions betweenvegetation cover and environmental factors. changes occurred in range covers are caused bymatrix dominance, one of the most important environmental factors. decision support system(dss) could be used for determining the rate and importance of each factor. actually, inmethods based on dss, relations between input and outpu...

Journal: :international journal of industrial mathematics 0
m. momeni department of industrial management, university of tehran, iran. g. r. jahanshahloo faculty of mathematical science and computer engineering, university for teacher education, iran. m. rostamy malkhalifeh department of mathematics, science and research branch, islamic azad university ,iran. s. razavi department of industrial management, university of tehran, iran. k. yakideh department of industrial management, university of tehran, iran.

in the real world there are groups which composed of independent units. the conventional data envelopment analysis(dea) model treats groups as units, ignoring the operation of individual units within each group.the current paper, investigates parallel system network approach proposed by kao and modifies it. as modi ed kao' model is more eligible to recognize ecient groups, a new ranking m...

Journal: :computational methods for differential equations 0
mohammadreza ahmadi darani department of applied mathematics, faculty of mathematical sciences, shahrekord university, p.o. box 115, shahrekord, iran. mohammad hossein derakhshan department of applied mathematics, faculty of mathematical sciences, shahrekord university, p.o.box 115, shahrekord, iran alireza ansari department of applied mathematics, faculty of mathematical sciences, shahrekord university, p.o.box 115, shahrekord, iran reza khoshsiar department of applied mathematics, faculty of mathematical sciences, shahrekord university, p.o.box 115, shahrekord, iran

in this article, we survey the asymptotic stability analysis of fractional differential systems with the prabhakar fractional derivatives. we present the stability regions for these types of fractional di fferential systems. a brief comparison with the stability aspects of fractional differential systems in the sense of riemann-liouville fractional derivatives is also given.

The analysis of flow in water-distribution networks with several pumps by the Content Model may be turned into a non-convex optimization uncertain problem with multiple solutions. Newton-based methods such as GGA are not able to capture a global optimum in these situations. On the other hand, evolutionary methods designed to use the population of individuals may find a global solution even for ...

The aim of the paper is to analyze electro-thermo nonlinear vibration of a double-piezoelectric composite microplate-system (DPCMPS) based on nonlocal piezoelasticity theory. The two microplates are assumed to be connected by an enclosing elastic medium which is simulated by Pasternak foundation. Both of smart composite microplates are made of poly-vinylidene fluoride (PVDF) reinforced by zigza...

M . Tahery M . Vaez ghasemi T. Alahveranlo

Research centers have an important place in promoting science and technology nationwide. On the other hand, given the limitations in allocating the funds and the facilities needed to establish these centers, it is important to decide on the selection of priority centers. In this decision - making process, several factors, such as requirements, priorities and strategies, capabilities, and balanc...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تهران 1355

مقایسه دو زبان فارسی و فرانسه در سطح آوایی موضوع پژوهش حاضر است . این مقایسه نشان داده است که زبان فرانسه دارای 18 همخوان و 10 واکه دهانی و 3 واکه غنه است . واکه های دهانی با مشخصات پیشین ˆ پسین و بازی ˆ بستگی و واکه های غنه با مشخصات غنه، لبی و پیشین ˆ پسین طبقه بندی شده اند. در زبان فارسی و فرانسه دیفتانگ وجود ندارد، د حالیکه در فرانسه قدیم نه تنها واکه های دوتایی بلکه واکه های سه تایی نیز وج...

In this paper authors have considered a system having three units A, B1 and B2. A is controlled by a controller and B1 and B2 are independent. Two repairmen are involved in repair of the system. One of the repairmen (the first) is the foreman (boss) and the other an assistant (apprentice). Whenever any unit fails, repair is undertaken by boss. If the boss is busy in repairing and at the same ti...

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