نتایج جستجو برای: network
تعداد نتایج: 672072 فیلتر نتایج به سال:
data envelopment analysis (dea) measures the relative efficiency of decision making units (dmus) with multiple inputs and multiple outputs. dea-based malmquist productivity index measures the productivity change over time. we propose a dynamic dea model involving network structure in each period within the framework a dea. we have previously published the network dea (ndea) and the dynamic dea ...
This paper proposes a bi-objective reliable supply chain network design that immunizes the network against different sources of uncertainties. In this regard, scenario based stochastic programming method is applied to model different disruption scenarios affecting accurate performance of network stages. Also, reliable and unreliable facilities are suggested for lessening vulnerability of networ...
Data Envelopment Analysis (DEA) is one of the best methods for measuring the efficiency and productivity of Decision Making Units (DMU). Evaluating the efficiency of DMUs which have two or several stages by using the conventional DEA models, is equal to consider them as black box. This method, omits the effect of intermediate measure on efficiency. Therefore, just the first network inputs and t...
providing a high-quality service for transmission and playing real-time voice conversations (voice streaming) over wireless ad-hoc networks is no mean feat. buffering together with adjusting the playout time of the packets is a receiver-side solution to overcome this challenge. in this paper, a new adaptive playout adjustment algorithm is proposed to stream the voice conversations over wireless...
nowadays, the environmental impact of transportation project and, especially air pollution impacts, are major concerns in evaluating transportation projects. based on this concern, beside definition of traditional objective functions like total travel time and total investment cost, different type of environmental related function is considered as objective function in urban network design. in...
National Information Network is a local network and includes national data centers, communications infrastructure and software services. It will be deployed throughout the country, and provide e-government services and welfare and social services by optical fiber and broadband at 12 Mbps for Iranian people. Combination of national network and ICT lead to many direct and indirect impacts. The di...
Background and aims: Providing the adequate flow and water pressure in the firefighting network of the power plants requires the proper design and analysis of the firefighting system. This study aimed to model and hydraulic analysis the fire network in a combined cycle power plant to determine the network efficiency in the extinguishing of the possible fire. Methods: In the present study, the ...
ad hoc networks are multi-hop wireless networks without a pre-installed infrastructure. such networks are widely used in military applications and in emergency situations as they permit the establishment of a communication network at very short notice with a very low cost. video is very sensitive for packet loss and wireless ad-hoc networks are error prone due to node mobility and weak links. h...
در این پژوهش یک مدل sbm شبکه ای معرفی شد که در آن کارآیی کل سیستم برابر میانگین موزون کارآیی های بخش ها است. مزیت عمده مدل پیشنهادی، توانایی آن در ارائه معیارهای مناسب تر کارآیی، محاسبه وزن تمام بخش ها توسط مدل و ارزیابی هم زمان متغیرهای میانجی به عنوان ورودی و هم خروجی می باشد. بنابراین ضمن استفاده از رویکرد مدیریت مبتنی بر نتایج (rbm) برای باز شدن جعبه سیاه و سطح بندی نتایج، مدل جامع اندازه گ...
پارک ها و فضاهای سبز شهری عناصر جدایی ناپذیر شهرهای امروزی هستند زیرا از طرفی ریه های تنفسی شهر به حساب آمده و در تلطیف هوا نقش موثری دارند و از طرفی دیگر باعت افزایش جذابیت فضاهای سبز شهری شده و آن را تبدیل به مکانی برای تجدید قوای روحی کرده و بنیه گردشگری شهر را تقویت می بخشد. امرزوه پژوهشگران شهری به دلیل خصایص مذکور فضاهای شهر، این عامل را به عنوان یکی از معیارهای توسعه پایدار شهری تلقی نمو...
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