Modeling and simulation of near-earth wireless sensor networks for agriculture based application using OMNeT++
ABSTRACT In recent years, there have been a number of reported studies on the design of communication protocols using simulation platform. However, most of the reported works were evaluated using simple or idealistic wireless communication channel modeling. Experimental results have shown that the characterization and modeling of wireless communication channel is important to achieve a successful implementation of wireless sensor network (WSN) systems in agricultural based application. This paper investigates the impact of propagation model towards WSNs system under OMNeT++ simulation environment. Several realistic propagation models for WSNs are also reviewed. Several well known empirical vegetation models, namely MED Weissberger Model and ITU-Recommendation model are implemented in OMNeT++ simulation platform. It is observed that propagation model used gives significant impact towards the network performances. The results show that a combination of plain earth (PE) and vegetation model give more realistic result and can best describe the behavior of actual WSN systems when deployed in a real environment. Antenna heights and vegetation density are important parameters that affect communication network coverage and connectivity.
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ABSTRACT: The paper presents a testbed for Wireless Sensor Networks (WSN) located at Universidad del Norte in Barranquilla Colombia, created for testing different communication protocols in a real scenario with non-line of sight (NLOS) links and interference. The testbed uses XTend RF Modules at 900MHz, with 1 mW transmission power, and covers an area of 11,000 m2. Results show that the testbed has propagation characteristics difficult to reproduce in testbeds present in the literature. Experiments demonstrate testbed performance regarding path loss, average packet loss and number of duplicates. Despite poor performance of links in the network, percentage of successful packet reception in the sink node was 70%, using a controlled flooding protocol with 8 nodes. Testbed implemented is a real scenario for WSN applications where nodes are deployed randomly to cover a determined area. Given the radio employed, the testbed has the possibility of extending experiments to long range applications.Wireless Communication Systems (ISWCS), 2012 International Symposium on, Paris, France; 08/2012
Conference Paper: Research status and trends of rectangular packing problem[Show abstract] [Hide abstract]
ABSTRACT: The problem of rectangle packing which can be stated as putting the needed rectangles on the given sheet with an aim to minimizing sheet's unused area. The rectangle packing problem exists widely in the industry, such as mechanism, furniture and costume. Researching this problem has important practical and theoretical value. This paper discusses research status and trends of rectangular packing problem.Computer Science & Education (ICCSE), 2012 7th International Conference on; 01/2012
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ABSTRACT: Conference code: 87611, Cited By (since 1996):1, Export Date: 13 November 2013, Source: Scopus, Art. No.: 6076383, doi: 10.1109/CIMSim.2011.69, Language of Original Document: English, Correspondence Address: Harun, A.; School of Mechatronic Engineering, University Malaysia Perlis (UNIMAP), Perlis, Malaysia; email: firstname.lastname@example.org, References: Liu, H., Meng, Z., Shang, Y., Sensor Nodes Placement for Farmland Environmental Monitoring Applications 2009 5th International Conference on Wireless Communications, Networking and Mobile Computing, Sep. 2009, pp. 1-4;Proceedings - CIMSim 2011: 3rd International Conference on Computational Intelligence, Modelling and Simulation, Langkawi; 01/2011