به نام خدا
Title: A Survey of Ant Colony Optimization-Based Approaches to Routing in Computer Networks
Authors: Peter Janacik Dalimir Orfanus Adrian Wilke
Abstract: Nature has provided an elegant solution for the routing problem millions of years ago, when ant colonies started to use swarm intelligence to discover food and route it reliably to their formicaries. The approach utilized by ants has several advantages that are also useful in computer networks: complete distribution, load balancing finding shortest paths with a high probability. Several routing protocols designed for the area of computer networks have made use of this approach, called ant colony optimization. This paper provides first a broad overview of ant colony optimization-based routing protocols, while focusing on four selected approaches in later sections, describing their operation and discussing their properties in detail.
Publish Year: 2013
Published in: ISMS - IEEE
Number of Pages: 6
موضوع: الگوریتم کلونی مورچهها (Ant Colony Algorithm) – مسیریابی هوشمند در شبکههای کامپیوتری (Routing in Computer Networks)
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان
به نام خدا
Title: Graph Semantic Based Design of XML Data Warehouse: A Conceptual Perspective
Authors: Anirban Sarkar Sankhayan Choudhury Narayan C Debnath
Abstract: This paper has proposed a Graph � semantic based conceptual data model for XML based Data Warehouse (DW) system called GXDW model, to conceptualize the different facets of multidimensional databases which may contain semi- structured data. The model is an extension of object oriented paradigm and defines a set of graph based formal constructs, variety of relationship types with participation constraints. It is accompanied with a rich set of graphical notations those are used to specify the conceptual level design of semi-structured data based DW system. The proposed approach facilitates modeling multidimensional data with the existence of irregular, heterogeneous, partially organized and unordered data set. Moreover, a transformation mechanism also has been proposed for guiding the transformation of GXDW model schema into the related set of XML documents.
Publish Year: 2012
Published in: INDIN - IEEE
Number of Pages: 6
موضوع: انباره داده (Data Warehouse)
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان
به نام خدا
به دنبال طرح معلم که تخفیف های ارزنده ای را برای کاربران ارائه کرده است تعدادی از کاربران خواستار دریافت تخفیف های بدون محدودیت زمانی بودند لذا با موافقت مدیریت محترم مجموعه ایران سای و در راستای هر چه بیشتر یاری رساندن به کاربران محترم، تعرفه هایی به شرح زیر ارائه می گردد. امیدواریم با این گام بسیار کوچک کمکی به کاربران ایران سای کرده باشیم.
کلیه تعرفه های زیر بدون محدودیت زمانی می باشند و این اطلاعیه تا پایان اردیبهشت ماه 1392 در قالب طرح معلم2 معتبر خواهد بود.
کاربرانی که 10 امتیاز خریداری می کنند 12 امتیاز دریافت خواهند کرد.
کاربرانی که 20 امتیاز خریداری می کنند 25 امتیاز دریافت خواهند کرد.
کاربرانی که 30 امتیاز خریداری می کنند 38 امتیاز دریافت خواهند کرد.
کاربرانی که 40 امتیاز خریداری می کنند 51 امتیاز دریافت خواهند کرد.
کاربران که 50 امتیاز خریداری می کنند 65 امتیاز دریافت خواهند کرد.
کاربران گرامی پس از خرید امتیاز، لطفا ایمیلی را به Financial@IranSci.ir با عنوان تخفیف طرح معلم 2 ارسال نمایند (یا به پشتیبانی آنلاین اطلاع دهند) تا نسبت به ارتقاء امتیازشان اقدام شود.
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان
به نام خدا
Title: A Neuromorphic VLSI Grid Cell System
Authors: Tarek M Massoud , Timothy K Horiuchi
Abstract: Neurons in the medial entorhinal cortex of rats have been found to respond in a two-dimensional hexagonal grid pattern anchored to the environment. Grid cells with different spatial frequencies are thought to contribute to the creation of unimodal place? cell responses useful for spatial navigation. In this paper we present results from an analog VLSI circuit that generates a hexagonal grid of activity using continuous attractor dynamics and transmits this pattern via neuron-like spikes. This circuit is a component of a larger system for modeling the neural circuits underlying mammalian spatial navigation.
Publish Year: 2012
Published in: IEEE-ISCAS
موضوع: طراحی مدارهای VLSI
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان
به نام خدا
Title: Dynamic router node placement in wireless mesh networks: A PSO approach with constriction coefficient and its convergence analysis
Author: Chun Cheng Lin
Abstract: Different from previous works, this paper considers the router node placement of wireless mesh networks (WMNs) in a dynamic network scenario in which both mesh clients and mesh routers have mobility, and mesh clients can switch on or off their network access at different times. We investigate how to determine the dynamic placement of mesh routers in a geographical area to adapt to the network topology changes at different times while maximizing two main network performance measures: network connectivity and client coverage, i.e., the size of the greatest component of the WMN topology and the number of the clients within radio coverage of mesh routers, respectively. In general, it is computationally intractable to solve the optimization problem for the above two performance measures. As a result, this paper first models a mathematical form for our concerned problem, then proposes a particle swarm optimization (PSO) approach, and, from a theoretical aspect, provides the convergence and stability analysis of the PSO with constriction coefficient, which is much simpler than the previous analysis. Experimental results show the quality of the proposed approach through sensitivity analysis, as well as the adaptability to the topology changes at different times.
Publish Year: 2013
Published in: Information Sciences - Science Direct
موضوع: شبکه های بی سیم (Wireless Networks)
ایران سای – مرجع علمی فنی مهندسی
حامی دانش بومی ایرانیان