Maria Ellen L. Estrellado

Work place: Technological Institute of the Philippines, Cubao, Quezon City, 1109, Philippines



Research Interests: Engineering


Maria Ellen L. Estrellado was born in Casiguran, Sorsogon. She earned her Master’s Degree in Master in Management major in Public Administration at Sorsogon State College, Sorsogon City in 2005 She obtained her baccalaureate degree in BS Computer Science at Aemilianum Institute, Sorsogon in 1997.
After receiving her baccalaureate degree, she worked as a Clerk at Allied Banking Corporation, Sorsogon City branch in 1997. Afterwards, she worked as a clerk at the Sorsogon State College until October 2005. At present she is a college instructor of the said institution and teaching computer subjects at the Engineering/Architecture Department.

Author Articles
Test Bank Management System Applying Rasch Model and Data Encryption Standard (DES) Algorithm

By Maria Ellen L. Estrellado Ariel M. Sison Bartolome T. Tanguilig III

DOI:, Pub. Date: 8 Oct. 2016

Online examinations are of great importance to education. It has become a powerful tool for evaluating students’ knowledge and learning. Adopting modern technology that saves time and ensures security. The researcher developed a Test Bank Management System that can store test items in any subjects. The system is capable of conducting item analysis using the Rasch model scale. Items that undergo analysis based on Rasch scale helped faculty by quantifying each item as “good”, “rejected”, or “revised”. For securing items in the test bank, Data Encryption Standard (DES) algorithm was successfully applied thus ensuring the safety and reliability of the questions in the test bank. Only items that are ready for deployment to the student’s computer during the examinations will be decrypted. In conclusion, the system passed the evaluation process and eliminates redundancy of manual work.

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