IJET Vol. 6, Issue 2, June 2020
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Öğe Box-Behnken Design Optimization of Sand Casting Process Parameters(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2020) Aliemeke, Blessing Ngozi Goodluck; Oladeinde, M.Sand casting is reputed for the manufacture of engine components as a result of its ease of operation. An assemblage of process parameters at optimal conditions leads to enhanced mechanical properties of automobile engine components. The Response Surface Methodology Design of experiment created an experimental layout for the sand casting process parameters and the various levels as applied in the production of engine pistons at the foundry. The Box-Behnken Design provided a matrix of 27 experiments to be conducted. Multiple linear Regression technique was employed to develop a mathematical model for the hardness of the aluminium alloy. The developed model was inputted into the evolutionary Genetic Algorithm tool box as an objective model. The optimal levels determined from the Genetic algorithm were used to carry out actual experiment in the foundry and the result was similar to the predicted hardness value of the developed model. Statistical ANOVA test conducted showed that the mathematical model was adequate with a R2 value of 81.02% and R2 (adjusted) value of 60.07%. The developed model has a p-value of 0.016 which indicates that the model was significant. The optimal values obtained for pouring temperature, vibration frequency, vibration time and runner size are 700oC, 31.52Hz, 59.998sec and 469.69mm2 respectively.Öğe Secure and Fast Encryption Routine+: Evaluation by Software Application(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2020) Şahin, M. Faruk; Mahmood, Musaria Karim; Myderrizi, IndritNowadays, the Internet era and its components are based on the collection, exchange, and storage of information which represent a sever security concern. Many cipher algorithms have been developed, evaluated, and implemented to increase the protection of data for various applications. The most known strategy of data securing has been the implementation of symmetrical key encryption standards. Secrecy, robustness, reliability, and software/ hardware implementation, are among the most important properties of good cipher standard. In this work, text, data and image encryption/decryption are performed by a MATLAB software implementation of the symmetric key block standard realized using the Secure and Fast Encryption Routine (SAFER+) algorithm with 128 key length option. The results show good performances in encryption/ decryption speed through a set of original procedures to simplify the achievement of nonlinear functions adopted by SAFER+ structure.
