Feature extraction of electroencephalography signals using fast fourier transform| Web based application for early detection of vitamin and mineral deficiency| The effects of e-tourism to the development of tourism sector in Indonesia| Implementation of RSA 2048-bit and AES 256-bit with digital signature for secure electronic health record application| Development of a web-based information system for material inventory control: the case of an automotive company| Optimization of the bugs classification of the ticketing system in software development: a study case