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Modeling and evaluation with object stochastic activity networks
, Article Proceedings - First International Conference on the Quantitave Evaluation of Systems, QEST 2004, Enschede, 27 September 2004 through 30 September 2004 ; 2004 , Pages 326-327 ; 0769521851 (ISBN) ; Movaghar, A ; Sharif University of Technology
2004
Abstract
Stochastic activity networks (SANs) are a stochastic generalization of Petri nets. SAN models have been used for performance, dependability and performability evaluation and are supported by several powerful modeling tools. We have recently introduced object stochastic activity networks (OSANs) to overcome some restrictions of these models. OSANs integrate the concepts of object-orientation into SAN models. Elements of OSANs and their submodels are defined as classes. In this paper, we briefly introduce OSANs and SANBuilder tool for modeling and evaluation with these models. © 2004 IEEE
FTS: An efficient tree structure based tool for searching in large data sets
, Article ICIME 2010 - 2010 2nd IEEE International Conference on Information Management and Engineering, 16 April 2010 through 18 April 2010 ; Volume 2 , April , 2010 , Pages 294-298 ; 9781424452644 (ISBN) ; Najafpour, M ; Mahdavi, M ; Ashurzad Delcheh, M ; Khalkhali, I ; Sharif University of Technology
2010
Abstract
This paper addresses the issue of finding and accessing desired items when a large amount of data items are concerned, by proposing some concepts based on Tree Search Structure -a hierarchical structure for information retrieval. The proposed concepts are applicable to several environments such as File Managers on PCs, help tree views, site maps, taxonomies, and cell phones. A software tool, FTS (File Tree Search), that is developed to utilize the proposed concepts is also presented
Development of Procedures, Forms and Tools for Post-Earthquake Reconnaissance
, M.Sc. Thesis Sharif University of Technology ; Mahsuli, Mojtaba (Supervisor)
Abstract
This study aims to design and develop procedures, forms, and tools for post-earthquake reconnaissance. The current procedure for data collection is based on the sending of groups to identify the dimensions of the evidence and its consequences by the executive and responsible institutions. Studying and reviewing the reports that have been produced by this method shows that there is not any systematic mechanism for collecting data on a wide scale and from all aspects of the evidence. The limited data collected by the executive and responsible institutions are scattered in the reports and are less documented in the database. Therefore, it is necessary to collect big data on the severity and...
Performability comparison of schedulability conditions in real-time embedded systems
, Article Proceedings - 3rd International Conference on Dependability, DEPEND 2010, 18 July 2010 through 25 July 2010, Venice, Mestre ; July , 2010 , Pages 70-75 ; 9780769540900 (ISBN) ; Miremadi, S. G ; IARIA ; Sharif University of Technology
2010
Abstract
In modern safety-critical real-time embedded systems, performance and reliability are two most important parameters. The joint consideration of these two parameters is called performability. This paper evaluates and compares different schedulability conditions, which are used for scheduling tasks with fault-tolerant Rate-Monotonic (RM) algorithm, with respect to their performability. The task reexecution scheme is used to implement fault tolerance in the RM scheduling algorithm. To evaluate the schedulability conditions, a software tool is developed to simulate an embedded processor with m schedulable periodic tasks. The results show that among five different schedulability conditions used...
Dealing with feature interactions for prismatic parts in STEP-NC
, Article Journal of Intelligent Manufacturing ; Volume 20, Issue 4 , 2009 , Pages 431-445 ; 09565515 (ISSN) ; Xu, X ; Lazcanotegui, I ; Sharif University of Technology
2009
Abstract
Determining the precedence of machining features is a critical issue in feature-based process planning. It becomes more complex when geometric interaction occurs between machining features. STEP-NC, the extension of STEP (ISO 10303) standard developed for CNC controllers, is a feature-based data model. It represents all the geometric and topological product data minus feature interactions. In this paper, machining precedence of interactive and non-interactive STEP-NC features is discussed. Local and global precedence of machining features are defined on the basis of geometric constraints, such as geometric interaction of features and feature approach face and technological constraint such as...
Investigating the effects of schedulability conditions on the power efficiency of task scheduling in an embedded system
, Article ISORC 2010 - 2010 13th IEEE International Symposium on Object/Component/Service-Oriented Real-Time Distributed Computing, 5 May 2010 through 6 May 2010, Carmona, Sevilla ; Volume 1 , 2010 , Pages 102-106 ; 9780769540375 (ISBN) ; Miremadi, S. G ; Politecnica; IEEE ; Sharif University of Technology
2010
Abstract
Power consumption, performance and reliability are the most important parameters in modern safety-critical distributed real-time embedded systems. This paper evaluates and compares different schedulability conditions in faulttolerant Rate-Monotonic (RM) and Earliest-Deadline-First (EDF) algorithms, with respect to their power efficiency. The primary-backup scheme is used to implement fault tolerance in the algorithms. To evaluate the algorithms, a software tool is developed that can simulate an embedded system consisting of n processors and m periodic tasks. The results show that depending on the different schedulability conditions, the EDF algorithm implemented with the Best-Fit policy is...