Article Per Year (5 Year)
p-Index From 2021 - 2026
4.468
P-Index
This Author published in this journals
All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) TELKOMNIKA (Telecommunication Computing Electronics and Control) Abdimas Lembaran Ilmu Kependidikan Scientific Journal of Informatics Jurnal Kajian Informasi & Perpustakaan JURNAL PROFESI KEGURUAN Dinamisia: Jurnal Pengabdian Kepada Masyarakat JMM (Jurnal Masyarakat Mandiri) Journal of Innovation in Educational and Cultural Research Journal of Soft Computing Exploration International Journal of Engineering, Science and Information Technology Journal of Advances in Information Systems and Technology Proceeding of International Conference on Science, Education, and Technology Recursive Journal of Informatics Scientific Journal of Informatics Jurnal Abdi Negeri Recursive Journal of Informatics
Aji Purwinarko, Aji
Unknown Affiliation
Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

Published : 45 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 16 Documents
Search
Journal : Scientific Journal of Informatics

 1   2 
The Evaluation of Final Assignment System Using the USE Questionnaire Approach Purwinarko, Aji; Subagja, Mona; Yanuarto, Alfath
Scientific Journal of Informatics Vol 7, No 2 (2020): November 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v7i2.26053

Abstract

Universitas Negeri Semarang has utilized information system technology to facilitate the assessment of final student assignments. So it is necessary to test this information system to determine user satisfaction and the success of the information system in providing services. One way to test the information system is to analyze the usability aspect, using the Usefulness, Satisfaction, and Ease of use (USE) Questionnaire. Data collection involved 75 respondents from users of the final assignment system. The reliability test results on 30 questions resulted in a Cronbach's alpha value of 0.97, which means that the questionnaire's reliability was excellent. Whereas for Usability measurement, the percentage value of Usefulness is 86.7%, Ease of Use is 84.4%, Ease of learning is 86.6%, and Satisfaction is 83.0%, which shows that the final assignment system is very worthy of being used.
Implementation of Support Vector Machine Algorithm with Correlation-Based Feature Selection and Term Frequency Inverse Document Frequency for Sentiment Analysis Review Hotel Ririanti, Novia Puji; Purwinarko, Aji
Scientific Journal of Informatics Vol 8, No 2 (2021): November 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v8i2.29992

Abstract

Purpose: The study aims to reduce the number of irrelevant features in sentiment analysis with large features. Methods/Study design/approach: The Support Vector Machine (SVM) algorithm is used to classify hotel review sentiment analysis because it has advantages in processing large datasets. Term Frequency-Inverse Document Frequency (TF-IDF) is used to give weight values to features in the dataset. Result/Findings: This study's results indicate that the accuracy of the SVM method with TF-IDF produces an accuracy of 93.14%, and the SVM method in the classification of hotel reviews by implementing TFIDF and CFS has increased by 1.18% from 93.14% to 94.32%. Novelty/Originality/Value: Use of Correlation-Based Feature Section (CFS) for the feature selection process, which reduces the number of irrelevant features by ranking the feature subset based on the strong correlation value in each feature
A Hybrid Security Algorithm AES and Blowfish for Authentication in Mobile Applications Purwinarko, Aji; Hardyanto, Wahyu
Scientific Journal of Informatics Vol 5, No 1 (2018): May 2018
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v5i1.8151

Abstract

Nowadays, everything is within our grasp and with the mobile phones become easier. Its use is not limited to calls and SMS but has become a tool that can be used to serve business transactions, banking, academic of data through mobile applications. Tus, the security of authentication in the mobile application needs to be improved to avoid a hacker attack. This article presents an authentication in the mobile application to the server using a hybrid of cryptographic algorithm Advanced Encryption Standard (AES) and Blowfish. AES and Blowfish is a symmetric key algorithm is very fast and powerful. With the utilization of a large block size of AES and Blowfish to encrypt keys, AES security will be much more robust and complicated to attacked. So, it will be difficult for hackers to perform Man in the Middle (MitM) attacks.
Komputasi Grid Menggunakan Globus untuk Menghitung Opsi Put Amerika dengan Simulasi Monte Carlo Purwinarko, Aji; Pulungan, Reza
Scientific Journal of Informatics Vol 1, No 1 (2014): May 2014
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v1i1.3637

Abstract

Internet dan teknologi komputasi grid mengubah cara kita mengatasi masalah yang kompleks. Komputasi grid terus menjanjikan untuk memberikan kemampuan yang tinggi dari berbagai sistem dan teknik komputasi. Kemampuan mendistribusikan aplikasi pada beberapa mesin adalah salah satu aspek kunci dari komputasi grid. Salah satu penyedia librari komputasi grid adalah Globus Toolkit. Komputasi grid ini dapat dimanfaatkan untuk menjalankan aplikasi opsi put Amerika dengan menggunakan simulasi Monte Carlo. Simulasi Monte Carlo dapat meramalkan harga saham yang akan terjadi. Dari hasil penelitian yang dilakukan, menunjukkan bahwa semakin banyak simulasi yang dilakukan maka semakin akurat nilai rata-rata harga saham. Hasil penelitian ini menunjukkan bahwa semakin banyak simulasi yang dilakukan, akan menghasilkan nilai opsi put yang konvergen dengan standard error yang kecil dan proses komputasi dengan menggunakan jumlah prosesor yang besar akan lebih cepat. 
RETRACTED: The Evaluation of Final Assignment System Using the USE Questionnaire Approach Purwinarko, Aji; Subagja, Mona; Yanuarto, Alfath
Scientific Journal of Informatics Vol 8, No 1 (2021): May 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v7i2.26033

Abstract

This paper is retracted by editor due to publication ethics missconducted by author (simultaneously publication in other issue).Similar article has appeared in https://journal.unnes.ac.id/nju/index.php/sji/article/view/26053
Model Expertise Management System di Universitas Negeri Semarang Purwinarko, Aji; Sukestiyarno, YL
Scientific Journal of Informatics Vol 1, No 2 (2014): November 2014
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v1i2.4024

Abstract

Pemanfaatan sistem informasi sebagai penopang organisasi tidak dapat dipungkiri lagi, dimana setiap bagian dari organisasi diharapkan mampu memberikan pelayanan yang cepat dan akurat kepada setiap end user. Salah satu bentuk layanan sistem informasi tersebut adalah Expertise Management System (EMS). EMS dikembangkan di Universitas Negeri Semarang (UNNES) memiliki kemampuan untuk menyajikan data tentang pakar-pakar yang telah dimiliki UNNES kepada end user. Desain EMS melalui tahap prototype (analisis, perancangan, desain sistem, DFD, ERD, dan desain skema database), pemrograman, pengujian dan pemeliharaan. Melalui EMS ini pula, UNNES dapat menawarkan pakar-pakarnya untuk berkolaborasi dalam penelitian maupun kegiatan lainnya, sehingga dengan sendirinya akan memperkuat posisi UNNES di dalam persaingan tingkat regional maupun global. 
Co-Authors Adi, Mahargjo Hapsoro Aditya Marianti Akhmad Munawar Alfa Narendra Amalia Langgundi, Fitri Amidi Amidi Amin Retnoningsih Amirul Mukminin Andestian, Defin Anggyi Trisnawan Putra Annindya Ardiansari Ardhi Prabowo Arif Widiyatmoko, Arif Arsyadani, Fathan Aryani, Nila Prasetya Aryono Adhi, Aryono Bambang Sugiantoro Budi Prasetiyo, Budi Budiman, Kholiq Cahyani, Rima Ayu Damayanti, Dela Rista Dimarti, Safira Chairani Edi Subkhan, Edi Fianti Fianti, Fianti Fitri Arum Sasi, Fitri Arum Fridiyanto, Fridiyanto Hakim, M. Faris Al Hapsari, Renita Arianti Hasan Mukhibad Hasani, Azharu Alfi Ian Yulianti, Ian Indah Urwatin Wusqo Insan , Shiva Maulana Khoiru Islam, Muhamad Anbiya Nur Kasinyo Harto Krishandhie, Syuja Zhafran Rakha Langlang Handayani Lutfia Nur Hadiyanti, Lutfia Nur Mahargjo Hapsoro Adi Majidah Majidah Mardiansyah, M Fadil Martien Herna Susanti Melati, Inaya Sari Melissa Salma Darmawan MHD. Reza M.I. Pulungan Muhamad Taufiq Munawar, Akhmad Mutoriq, Alfat Nor Hafizah Ngajikin Nuni Widiarti Nur Kusuma Dewi Putra, Ngurah Made Darma Rafli, Alfandy Himawan Bagus Rahmawati, Sinta Kurnia Ririanti, Novia Puji Sri Siswati Subagja, Mona Subhan Subhan SUGIYANTO Sugiyarta Stanislaus, Sugiyarta Sujarwata Sujarwata Sukestiyarno Sukestiyarno Susilo Susilo Syukron Salam, Syukron Tris Sugiarto Tsabit Azinar Ahmad Utis Sutisna Wahyu Hardyanto Wahyu Setyaningrum Widiyanto Widiyanto Woro Sumarni Yanuarto, Alfath YB. Praharto Yuliantika, Atika