Application of Fuzzy Dematel Technique to Assess Most Common Critical Operational Faults of Marine Boilers

Bashan, Veysi | Demirel, Hakan

Article | 2019 | JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI22 ( 3 ) , pp.545 - 555

Effects of Character Recognition with Shell Histogram Method Using Plate Characters

Uzun Arslan, Rukiye | Incetas, Mursel Ozan | Dikici, Sedat

Article | 2019 | JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI22 ( 4 ) , pp.1093 - 1099

Character recognition is a study that has been used in various fields for many years. In character recognition, the aim is to identify the various texts, letters and symbols in the images as accurately and quickly as possible. In addition to the Optical Character Recognition (OCT) method, which is used as a very common method, there are many feature extraction methods in which character image features are compared. In this study, which is presented as another feature extraction method, the letters on the license plates are recognized. The characters were examined using the circular shape histogram technique and histograms were obtai . . .ned from the sectors within the circular regions. Feature vectors for letter characters were created using character pixel densities in sectors. Feature vectors are analyzed linearly and an alternative quick character recognition method is presented. With the proposed method, the element numbers of the feature vectors are kept constant. In this way, both the processing speed is increased and the processing speed variations are minimized The results show that the proposed method requires lesser parameters than the OCT method, but also has a significant success rate according to known feature extraction methods Daha fazlası Daha az

The algorithm development and implementation for 3d printers based on adaptive PID controller

Altan, Aytaç | Hacıoğlu, Rıfat

Article | 2018 | JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI21 ( 3 ) , pp.559 - 564

The 3D printers widely used in the world are produced in different mechanical and electronic designs. The 3D printers which have various mechanical structures such as cartesian, delta and core (xy, xz) already are used open source code software such as Sprinter, Marlin, Cura 3D and Teacup. The control of the 3D printers is usually done by the classical Propotional-Integral-Derivative (PID) control algorithm. In this study, we have developed for the designed 3D printer a new software by using adaptive PID control algorithm instead of classical PID. Five step motors of the designed 3D printer are controlled by the adaptive PID. In add . . .ition, there are both heating and cooling processes in the extruder system and these processes are controlled by the adaptive PID. The mechanical design uses a belt and pulley drive system which is suitable for accelerated movements. In the system software, 3D Printing Software Pipeline (input model, orientation and positioning, support structures, slicing, path planning, machine instructions) is applied. The control algorithms for extruder and step motors are prepared as separate function files in software implemented in C. It has been observed that the designed software is particularly successful in eliminating errors on the surface of the products Daha fazlası Daha az

Classification of Power Quality Disturbances with 2D Discrete Wavelet Transform and Bagged Decision Trees Method

Karasu, Seckin | Sarac, Zehra

Article | 2018 | JOURNAL OF POLYTECHNIC-POLITEKNIK DERGISI21 ( 4 ) , pp.849 - 855

In this study, to classify Power Quality (PQ) disturbances, attributes are extracted by 2D Discrete Wavelet Transform (2D-DWT) method and Support Vector Machines, Artificial Neural Networks and Bagged Decision Trees (BDT) methods are used for classification stage. 2200 signals are synthetically produced for 11 different PQ disturbances, including noisy (40 dB, 30 dB and 20 dB) and noiseless states. Signals are transformed into 2D image matrices and 2D DWT is applied to each. Attributes are created by applying different level of decomposition and statistical properties. The most appropriate ones are selected with Sequential Forward S . . .election (SFS) and ReliefF methods. BDT method, which uses selected attributes with SFS, is the method that gives the best performance with a rate of 99.12 +/- 0.12% Daha fazlası Daha az

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