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    Development and Application of Android Based Mobile Optical Test Reading System
    (Institute of Electrical and Electronics Engineers Inc., 2020) Konuk, M.S.; Akkus, N.; Yerden, A.U.
    In this study, a mobile-based optical reading system was developed for the rapid evaluation of educational processes. Optimization of the optical reading process was aimed with the mobile application developed. It takes time to evaluate the results of multiple choice test exams. The results of the existing systems were evaluated by analyzing the deficiencies. A reliable and open to development system was designed. A photo of the exam paper was taken with the camera of an android phone and transferred to the developed mobile application. Response options and student numbers were read. In the light of the obtained data, student, teacher and exam information were transferred to the database. Reports could be obtained with this information at any time in the online environment. The optimum amount of light that provides the most ideal reading of the optical form was determined as a result of the measurements. With the application with a user friendly interface, it was seen that successful results were obtained in the photos taken with a right angle and greater than 50 lumens of the ambient light without being connected to a separate device. © 2020 IEEE.
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    Estimation and Validation Residual Stresses of Butt Welding and Pocket Machining Processes via Sequential Simulation
    (American Institute of Physics Inc., 2023) Cetintav, I.; Akkus, N.; Can, Y.
    Welding and machining processes, which are frequently used in industry to provide the desired geometry and conditions to metals, contain residual stresses and these residual stresses are undesirable for the manufacturing industry. In this study, residual stresses after butt welding and machining variation of these stresses were investigated experimentally and numerically. MSC Marc Mentat commercial software is used for simulations of sequential processes. The results of the finite element model created for the simulation of the welding process are recorded at the end of the simulation and these results are transferred to the cutting simulations without any changes with the pre-stress option. For the validation of the numerical method, 100x50x10mm AISI 304 steel plates were used in the experimental study. TIG welding process has been applied to the parts first and the desired geometry is given to the parts that have been welded with the help of milling cutter. Residual stresses were measured after both treatments. Experimental and numerical results obtained from sequential operations were compared and found satisfactory. © 2023 American Institute of Physics Inc.. All rights reserved.