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Articles by A.A. Alesheikh
Total Records ( 5 ) for A.A. Alesheikh
  Y.E. Ghajary and A.A. Alesheikh
  The aim of this study are to evaluate the current states of the Moving Objects (MO) systems and extend them to support tracking, indexing, modeling and visual querying of public transportation buses. To evaluate the system, the queries posed by fleet management companies are selected. The results showed its superior functionalities through text-based and visual queries. This study will contribute to the establishment of a Moving Objects Management System (MOMS) with modest expenditure and a short development period and which is independent of the database used.
  A.R. Vafaeinezhad , A.A. Alesheikh , A.A. Roshannejad and R. Shad
  This study explores the advantages of modeling spatio-temporal events in an earthquake scenario. For this purpose, the theory of Time Geography is assessed and extended such that rescue team can act more efficiently. Heuristic programming in an activity based manner is exercised to manage team activities in space and time. Rescue team is forced to perform several tasks in an earthquake event; this study focuses on modelling the activities of life-detecting, collapse-lifting and injured-transporting. In order to assess the model, a case study was simulated through normal and suggested methods. The comparisons between them have done through three different scenarios; fixed numbers of members, fixed number of members with 5 h work limitation and finally variable number of members with no time constraint. The statistical analysis on the results show an average of 27.22% improvement in groups` activities. This model can be implemented on Spatio-Temporal Geospatial Information System (GIS) and other researchers can develop it to manage the entire rescue team activities.
  A.R. Ebrahimipoor , A. Alimohamadi , A.A. Alesheikh and H. Aghighi
  Linear and nonlinear optimization problems can be solved using classical methods. However, the solutions become inefficient as the number of variables and limitations increase. Routing pipelines requires optimum solutions in which technical, economical and environmental parameters are taken into consideration. In this study capabilities of GIS and Genetic Algorithm have been exercised to specify the best route for constructing a pipeline from the Panzdahe Khordad dam to city of Qom, Qom located in central part of Iran. Hence, all the required information have been gathered and transformed to a GIS database. The layers have then been weighted and integrated to represent the cost layers. In order to evaluate the algorithm, three routes have been compared, namely the existing route, the routes defined by using Genetic Algorithm and the least cost path approaches. Results of the research have shown that the Genetic Algorithm and least-cost routes were the same in most parts. The Genetic Algorithm route proved to be 20% cost efficient than the existing routes. The cost reduction is mainly attributed to the decrease in the pipeline length as well as the number of bridges. This study showed that the Genetic Algorithm can be used as a reliable solution in problems related to route optimization.
  M. Alivand , M.R. Malek and A.A. Alesheikh
  This study introduces a risk parameter for evaluating the unreliability of the optimal path analysis in dynamic networks. The parameter is composed of several geometric features of the networks such as connectivity, accessibility and K-shortest paths. Integrating these parameters with pure optimization features improves the operation of optimal path algorithms in transportation networks. This is confirmed by testing the proposed algorithm on a real network. Details of the algorithm and its assessment are presented in the study.
  E. Poorazizi , A.A. Alesheikh and S. Behzadi
  Field based and GPS assisted GIS are frequently used in various geoscience applications. Such systems deliver more advanced, time and cost effective tools than traditional field forms for information collection. At the same time, different systems are on the market. These systems mostly enable users to determine positions of geo-objects by GPS and maintain functionalities to gather and analyze geometric information. The digital obtaining of the application`s specific information is often underrepresented within these kinds of systems. This study attempted to develop a system for gathering, integrating, analyzing and visualizing spatial and aspatial information in electrical industry facilities. A PDA based GIS is extended to collect information in a beneficial manner, thus, adequately supporting the requirements of its users. Mobile GIS architectures, the components of a mobile GIS and their impacts on gathering data are examined. The steps followed to design and develop a system for the electricity Transmission and Distribution Company are demonstrated. The results are presented and discussed in details in the study.
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