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240 articles for “optical”
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Research ArticleOpen accessEvery word in the titleGENETIC ALGORITHM AND NEURAL NETWORK FOR OPTICAL CHARACTER RECOGNITIONHendy Yeremia, Niko Adrianus Yuwono, Pius Raymond, Widodo BudihartoComputer system has been able to recognize writing as human brain does. The method mostly used for character recognition is the backpropagation network. Backpropagation network has been known for its accuracy because it allows itself to learn and improving itself thus it can achieve higher accuracy. On the other hand, backpropagation was less to be used because of its time … …Journal of Computer Science, Vol. 9, Issue 11 · 19 Sep 2013 · 7,646 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleSelection of Spectral Filters for Optical Demultiplexer Via Same Source Different Filters Testing TechniqueMohammad Syuhaimi Ab-Rahman, Hadiguna, Latifah Sarah Supian, Malik SulaimanThis study aims to evaluate the effectiveness of selected color filter film for demultiplexer construction where only signals with certain wavelengths are allowed to pass through the demultiplexer while the other signal that carrying different wavelengths are absorbed. Characterization testing and analysis is done based on recorded data. Demultiplexer components are characterized by the Same Source at Different Filters (SSDF) … …Journal of Computer Science, Vol. 9, Issue 4 · 9 May 2013 · 6,247 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleSelection of Spectral Filters for Optical Demultiplexer-Same Filter Different SourceMohammad Syuhaimi Ab-Rahman, Hadiguna, Latifah Sarah SupianThis study aims to evaluate the effectiveness of selected color filter film for demultiplexer construction where only signals with certain wavelengths are allowed to pass through the demultiplexer while the other signal that carrying different wavelengths are absorbed. Characterization testing and analysis is done based on recorded data. Demultiplexer components are characterized by a Same Filter Different Sources (SFDS) and … …Journal of Computer Science, Vol. 9, Issue 4 · 6 May 2013 · 6,480 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleExamination of Plastic Filter on 1×N Fused-Taper-Twisted Polymer Optical Fiber DemultiplexerMohammad Syuhaimi Ab-Rahman, Latifah Sarah SupianProblem statement: In this study we propose the examination of the plastic filter on 1×3 POF demultiplexer. Approach: Three wavelengths are injected to the device which then split into three branches. Each branch is filtered by using specific color according to the pass through wavelength. Results: The developed demultiplexer is tested by transmitting signals through the polymer fiber-optic (10 meters … …Journal of Computer Science, Vol. 8, Issue 9 · 10 Aug 2012 · 7,119 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEstimate of Aerosol Optical Depth Using Broadband Direct Normal Observations at Highest Polluted Area in the WorldU. Ali Rahoma, A. H. HassanProblem statement: The measurement of different components of direct solar radiation for this research has been carried out in Helwan, Egypt. Helwan (Latitude 29°52 N, Longitude 31°20 E). This is a considered as the largest polluted region in the world. The level of pollution in Helwan region is higher, compared to the international limit by about 7 or 10 times … …American Journal of Applied Sciences, Vol. 7, Issue 5 · 31 May 2010 · 7,069 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAir Quality Interpretation of Four Geographically Distinct Hot Spot States of India-An Appraisal Using Aerosol Optical Depth and Particulate MatterJacob Joshua, Aishwarya Sathyachandran, Chenicherry House SujathaThe application of Moderate Resolution Imaging Spectroradiometer-Aerosol Optical Depth (MODIS-AOD) for Air Quality (AQ) assessment has contributed significantly by making use of a spatiotemporal relationship between ground-level particulate matter and aerosol optical density at both city and state levels. Traditional ground-based site-specific particulate matter monitoring method has found a profound gap in their spatial coverage. Such challenging situations prevail over … …American Journal of Environmental Sciences, Vol. 18, Issue 6 · 8 Feb 2023 · 5,883 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleDesign and Construction of Optical System to Detect of Ammonia GasMohanad M. Azzawi, Mohammed Jabbar Hussein, Nibras K. Jebur, Halla F. SaadThe idea of research is the detection of gases using the transmitter and receiver system for electromagnetic radiation in the IR region using the optical absorption method. As a result of the interaction of the light with the gas molecules can be detect and measure gas pressure adoption absorption method. It was chosen best absorption band between (1.4-1.6) um at … …International Journal of Structural Glass and Advanced Materials Research, Vol. 3, Issue 1 · 30 May 2019 · 6,977 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleOptical and Structure Analysis of ZnO:Al FilmNeilo Marcos Trindade, Michel Chaves, José Roberto Ribeiro Bortoleto et al.ZnO and ZnO:Al are wide-bandgap semiconductors which have many applications, mainly as transparent conducting films. Thin films of these compounds were deposited onto glass and silicon substrates by RF magnetron sputtering for the investigation of structural and optical characteristics. The XRD results show that the films present wurtzite structure. The formation of a polycrystalline film having a preferential crystallographic orientation … …American Journal of Engineering and Applied Sciences, Vol. 10, Issue 4 · 5 Oct 2017 · 7,855 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleInteractions of Aerosol Optical Depth and Cloud Parameters with Rainfall and the Validation of Satellite Based Rainfall ObservationsMd Monirul Islam, Md Mainul Islam Mamun, Md Zahidul Islam, Mumnunul KeramatAerosol-cloud interactions influence the global precipitation patterns that influence significantly the Earth's climate system. Anthropogenic aerosols alter the clouds and their optical properties. The present study has investigated the Aerosol Optical Depth (AOD), cloud parameters and rainfall interactions for three different monsoon periods (2008-2010) and also compared the satellite rainfall with ground based observations, by using MODIS and TRMM datasets. … …American Journal of Environmental Sciences, Vol. 13, Issue 4 · 24 Jun 2017 · 7,751 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleComparison of Classification Techniques on Fused Optical and SAR Images for Shoreline Extraction: A Case Study at Northeast Coast of Peninsular MalaysiaSyaifulnizam Abd Manaf, Norwati Mustapha, Md Nasir Sulaiman et al.Shoreline is a very important element to identify exact boundary at the coastal areas of a country. However, in order to identify land-water boundary for a large region using traditional ground survey technique is very time consuming. Alternatively, shoreline can be extracted by using satellite images that minimizes the mapping errors. The trend of extracting shoreline has been shifted from … …Journal of Computer Science, Vol. 12, Issue 8 · 27 Oct 2016 · 7,708 accessesView PDFCite