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Design of a Tree Ring Structure Analysis System to Estimate the Accurate Age of Tree Species in Sri Lanka

Instrumentation 2020年第3期7卷 50-59页

作者： Hasalanka DISSANAYAKE sisaara perera Department of Electrical and Computer Engineering Faculty of Engineering TechnologyThe Open University of Sri Lanka

Determination of an age in a particular tree species can be considered as a vital factor in forest management.In this research we have introduced a novel scheme to determine the accurate age of the tree species in Sri Lanka.This is initially developed for the tree species called‘Hora’(Dipterocarpus zeylanicus)in wet zone of Sri Lanka.Here the core samples are extracted and further analyzed by means of the different image processing techniques such as Gaussian kernel blurring,use of Sobel filters,double threshold analysis,Hough line tran sformation and etc.The operations such as rescaling,slicing and measuring are also used in line with image processing techniques to achieve the desired results.Ultimately a Graphical user interface(GUI)is developed to cater for the user requirements in a user friendly environment.It has been found that the average growth ring identification accuracy of the proposed system is 93%and the overall average accuracy of detecting the age is 81%.Ultimately the proposed system will provide an insight and contributes to the forestry related activities and researches in Sri Lanka.

关键词： Hora(Dipterocarpus zeylanicus) Image Processing Gaussian Kernel Blurring Sobel Filter Double Threshold Analysis Hough Line Transformation Graphical User Interface

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维普期刊数据库

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A Real-time EMF Measuring System for Mobile Communication Towers in Sri Lanka

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Instrumentation 2021年第2期8卷 22-33页

作者： Lakshitha Rangana WICKRAMASINGHE sisaara perera Sri Lanka Telecom PLCLotus RoadColomboSri Lanka The Open University of Sri Lanka NawalaNugegoda10250Sri Lanka.

Telecommunications Regulatory Commission of Sri Lanka is the governing body which is responsible for the frequency allocation and monitoring the unauthorized Electromagnetic frequency(EMF)signal transmitting violations.However,in Sri Lanka,currently there is not any proper mechanism to monitor the radiation hazard level and its impact to the people living in the vicinity of mobile communication towers.There are approximately 7000 mobile transmitting towers in Sri Lanka to date and the used frequency range lies between 900 MHz to 3 GHz for mobile communication.Over the last few decades,many of the health hazard conditions were reported due to the radiation of those harmful EMFs.To cater this problem,a portable real time EMF signal strength measuring system with a radiation hazard level indicator was developed to monitor the EMF level and its impact.The proposed system operates with three intermediate frequency bands(i.e.900 MHz,1800 MHz and 2400 MHz)and it’s capable of measuring the power density and the radiation hazard level at that particular point which is being measured.Moreover,the corresponding radiation hazard level is indicated with reference to the standard power density levels published by the International Commission on Non-Ionizing Radiation Protection(ICNIRP^(*)).The system works with the overall accuracy of 88%in terms of identifying the power densities and its corresponding radiation hazard levels.

关键词： Electromagnetic Frequency(EMF) Mobile Communication Power Density Radiation Hazard

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维普期刊数据库

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Design of a Vibration Sensor Based Train Arrival Detection System to Prevent Elephant-Train Accidents in Sri Lanka

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Instrumentation 2020年第4期7卷 40-47页

作者： Nuwantha.D.KULARATHNA sisaara perera Institute of Engineers Sri Lanka College of Engineering Department of Electrical and Computer Engineering The Open University of Sri Lanka

At present,Sri Lanka is home to about 5,000-6,000 wild elephants roaming over close to 70%of the country’s land.Despite this blessing,around 150 elephants die each year due to many reasons.The main reasons for the altercations between humans and elephants are the drastic increase in the human population,human encroachment upon elephant territory for agriculture and settlements and unplanned development and transportation efforts.Elephants are long lived herbivores,and their survival depends upon regular migration over large distances to search for food,water,and social and reproductive partners.According to the Sri Lanka railways the average number of elephants that get killed due to elephant-railway accidents is about 9 per year.As a solution for this problem,we have proposed a novel system to pass a signal to indicate the train arrival.The proposed system detects the vibration of the locomotives and after detecting the vibration,alarm system will generate a high frequency signal within the frequency range,where the elephants are sensitive.The proposed system is a low cost device and this can be placed anywhere at any time.Moreover,this project aims to protect elephants from being harmed which usually happen due to various human activities.

关键词： Herbivore Sri Lanka Railway Locomotives

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维普期刊数据库

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