Samaila Umaru

Publications (8) View all

• Article: Local Polynomial Wavelet Neural Network with a Nonlinear Structured Parameter Optimization Method

  Garba Inoussa Inoussa, Hui Peng, Zhi Cheng Ye, Usman Babawuro, Samaila Umaru
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  ABSTRACT: This paper presents a Local Polynomial Wavelet Neural Network with a Structured Nonlinear Parameter Optimization Method (LPWNN-SNPOM). The LPWNN-SNPOM is an improvement of the Wavelet Neural Network with a Hybrid Learning Approach (WNN-HLA). These two models have mainly three differences: i) The LPWNN-SNPOM method contains a bias, whose main contribution is to shift the output by mapping all points to the mean of the target points and leaving the hidden neurons and polynomial weight model the differences from that point. The bias may ameliorate the overall performance of the network to a certain degree. ii) The single parameter weights connecting the hidden layer with the output in the WNN-HLA are replaced by polynomial functions of the inputs in the LPWNN-SNPOM, allowing the weights to vary with the changes in the input and share the dynamics with the wavelet compartment. iii) Unlike the WNN-HLA, which uses an online optimization approach, the LPWNN-SNPOM makes usage of an offline optimization approach known as the Structured Nonlinear Parameter Optimization Method (SNPOM) to avoid any failure that may occur during online optimization. The performance and effectiveness of the proposed model are illustrated using several examples, whose results show the feasibility of the proposed model and demonstrate that it improved upon the WNN-HLA and performed better than some other well-known models.
  Journal of Information Science and Engineering. 01/2012;
• Article: Characterization of Some Nigerian Clays as Refractory Materials for Furnace Lining

  Abdullahi Madu Yami, Samaila Umaru
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  ABSTRACT: The suitability of some Nigerian clays as refractory raw materials was investigated. The clay samples were first analysed to determine their chemical compositions. Fireclay bricks test specimens were prepared by standard method. They were then tested for properties such as apparent porosity, bulk density, thermal shock resistance, fired shrinkage, refractoriness and cold crushing strength. The result obtained showed that both test samples qualify as high melting fireclays. The refractory properties measured revealed them as being usable as refractory bricks when blended
  Continental Journal of Engineering Sciences. 01/2007; Vol. 2.:Pp. 30-35..
• Article: Performance Evaluation of a Concentrating Solar Cooker under Hazy Weather Condition

  Dahiru Y.D, Samaila U, Habou D
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  ABSTRACT: Experimental performance evaluation of a concentrating solar energy cooker with mirrors glued on the inside wall of the parabolic concentrator as reflective material with reflectivity of over 80% is presented herein. Series of boiling water tests, cooking tests of rice and comparative analysis tests with other solar cookers were carried out in July and August 2002 at Abubakar Tafawa Balewa University Bauchi under various levels of atmospheric turbidity. These yielded very encouraging and satisfactory results. The tracking of the cooker was done manually and thus has to be adjusted in every 15 minutes during cooking time. The cooker was able to boil 666g of water and cook 300g of rice in three hours under the test condition. Furthermore the comparative analysis test results with other solar cookers showed that the temperature of the present cooker was found to have reached 70oC in 45 min. The maximum temperature reached by parabolic box and flat plate single glaze solar cooker was 60oC in 2 hours 15 minutes and 2 hours 45 minutes respectively. While that of flat-plate double glaze and Sun Spot solar cooker was found to have reached 77oC in 2hrs 45minutes and 50oC in 30 minutes. The present cooker was able to cook rice and boil water with an overall utilization efficiency of 21.5%.
  Continental Journal of Engineering Sciences. 01/2007; Vol.1(No. 3.):Pp. 36-44..
• Article: Computer Aided Design for Helical Compression Spring and Automobile Damping System

  S. Umaru, A. M. Yami, A. Babakano, M.A. Hassan, D. Sozinya
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  ABSTRACT: A Software for design of helical compression spring and automobile damping system was developed. The software has a size of 30.6 MB; it requires a computer of minimum speed of 166 MHz and memory of at least 64 MB and a hard disk space of 40 MB to function well. A windows operating system of at least windows 98 and office application that have Microsoft Access are also required for proper functioning of the software. The software has the advantage of saving information in a database system. It encompasses forms that design and (or) modify the system. The input required for running the software are the basic design requirements like load/length data required for the spring, selected material, spring service condition and specified end support. Additional inputs are static deflection, level of damping, amplitude decay factor and speed of vehicle. The output of the software shows the required wire spring parameters. The software was tested with test data from the open literature and the required wire spring parameters were obtained.
  Global Journal of Engineering and Technology. 01/2009; Vol. 2.(No. 2.):Pp. 243-253..
• Article: Development of Software for Wind Power Electricity Supply to Rural Areas of Nigeria

  S. Umaru, D.Y. Dasin, J.S. Enaburekhan, U.A. Garba
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  ABSTRACT: A Software for design of power supply system using wind system was developed. The software has a size of 30.6 MB; it requires a computer of minimum speed of 166 MHz and memory of at least 64 MB and a hard disk space of 40 MB to function well. A windows operating system of at least windows 98 and office application that have Microsoft Access and internet explorer are also required for proper functioning of the software. The software has the advantage of saving information in a database system. It encompasses forms that design and (or) modify the system. The input required for running the software are the basic design specifications like load, power factor, growth rate and locality name. Additional inputs are average wind speed, air density, system voltage, inverter size, regulator efficiency, charge controller size, statistics factors (scale/shape factor), battery selection and Turbine model. The output of the software shows the required bills of engineering measurements. The software was tested with some hypothetical cases and the bills of engineering measurements were obtained.
  Internatioanl Journal of Pure and Applied Science. 01/2009; Vol.2.(No. 3.):Pp. 72-80..