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All Journal Proceedings of KNASTIK Epsilon: Jurnal Matematika Murni dan Terapan Teknik dan Ilmu Komputer Jurnal Edukasi dan Penelitian Informatika (JEPIN) Journal of Information Systems Engineering and Business Intelligence Journal of Animation & Games Studies Jurnal Teknologi dan Sistem Komputer Jurnal Pendidikan (Teori dan Praktik) JUTEI (Jurnal Terapan Teknologi Informasi) JURNAL TEKNIK INFORMATIKA DAN SISTEM INFORMASI Jurnal ULTIMATICS International Journal of Community Service Learning Jurnal Informatika JUPIKA: JURNAL PENDIDIKAN MATEMATIKA Jurnal Abdi Masyarakat Indonesia JP (Jurnal Pendidikan) : Teori dan Praktik GIAT: Teknologi untuk Masyarakat SERVIRISMA: Jurnal Pengabdian kepada Masyarakat International Journal of Information Technology and Computer Science Applications (IJITCSA)
Raden Gunawan Santosa
Program Studi Informatika, Universitas Kristen Duta Wacana
Arts Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Public Health Social Sciences Transportation Other

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The MAPE Analysis of Arima (p,d,q) on LQ45 Stock Price to Determine Training Data Period Santosa, Raden Gunawan; Chrismanto, Antonius Rachmat; Lukito, Yuan; Raharjo, Willy Sudiarto
International Journal of Information Technology and Computer Science Applications Vol. 2 No. 3 (2024): September - December 2024
Publisher : Jejaring Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58776/ijitcsa.v2i3.168

Abstract

Most of the research using the Arima (p,d,q) focused on the accuracy of prediction results. Unlike other research, this work examines the training data period suitable for modeling ARIMA (p,d,q) in stock prices. Due to the volatile movement of stocks, the number of training data is assumed to affect the LQ45 prediction results. This research used five kinds of training data, including daily data for up to 5 years. With these five types of data series, the Arima (p,d,q) was made for LQ45 stocks. The prediction was conducted for two months after obtaining the model 5 data series of LQ45 stocks. Two months of data were used for January and February 2021 prediction test data. The results of this prediction were compared with the test data to produce the MAPE value. Based on the observations and calculation results, the most suitable stock to use the Arima (p,d,q) was ASII. In 5 years, the stocks produced the lowest MAPE value of 0.05%. Relatively stable LQ45 stocks with no change in the Arima (p,d,q) using four consecutive data series were ACES, CTRA, INTP, MIKA, and TLKM. Based on the MAPE value analysis performed in this study, we concluded that the best period to use the Arima (p,d,q) for LQ45 stocks is two years, with a median error rate of only 6.0091%.
Pengelolaan Pencatatan Keuangan Gereja Berbasis Komputer di Gereja Kristen Jawa Medari, Sleman, Yogyakarta Oslan, Yetli; Amarantini, Charis; Santosa, Raden Gunawan; Ernawati, Lussy
Jurnal Abdi Masyarakat Indonesia Vol 4 No 6 (2024): JAMSI - November 2024
Publisher : CV Firmos

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54082/jamsi.1463

Abstract

GKJ Medari adalah salah satu gereja yang masuk dalam klasis Yogyakarta Barat, sinode Jawa Tengah. GKJ Medari memiliki 5 (lima) wilayah pelayanan, yaitu GKJ Medari Murangan sebagai gereja induk, Pepanthan Cebongan, Pepanthan Tempel, Pepanthan Mancasan, dan Pepanthan Japanan. Sebelum PkM ini, pencatatan keuangan gereja di GKJ Medari dilakukan dengan menggunakan Microsoft Excel. Permasalahan yang muncul dari cara ini adalah pelaporan yang tidak dapat disajikan dengan tepat waktu, serta perbedaan cara pencatatan setiap wilayah pelayanan yang disebabkan karena belum digunakannya kode akun yang sesuai standar akuntansi. PkM ini merupakan upaya untuk meningkatkan kualitas pencatatan keuangan dengan membuat dan mengimplementasikan sebuah sistem keuangan berbasis komputer sesuai standar akuntansi untuk menghasilkan pencatatan keuangan yang transparan dan akuntabel. Tahapan yang digunakan pada PkM ini adalah observasi awal, perumusan masalah, pelaksanaan mencakup penyusuan CoA dan pembuatan sistem, implementasi, dan evaluasi. Hasil kegiatan PkM ini adalah daftar kode akun dengan struktur 6 (enam) digit sudah mengakomodasi keberagaman transaksi keuangan di GKJ Medari dan sebuah sistem informasi pengelolaan pencatatan keuangan. Keberadaan sistem ini juga telah mendorong terjadinya perubahan kecepatan dan ketepatan dalam pencatatan keuangan. Para pengelola keuangan juga sudah mulai memahami prinsip-prinsip akuntansi dalam pencatatan keuangan.
PENGGUNAAN RUMUS STIRLING DAN FUNGSI PEMBANGKIT MOMEN PADA PROSES PEMBUKTIAN DISTRIBUSI NORMAL SEBAGAI PENDEKATAN DISTRIBUSI BINOMIAL Santosa, Raden Gunawan; Haryono, Nugroho Agus
EPSILON: JURNAL MATEMATIKA MURNI DAN TERAPAN (EPSILON: JOURNAL OF PURE AND APPLIED MATHEMATICS) Vol 18, No 2 (2024)
Publisher : Mathematics Study Program, Faculty of Mathematics and Natural Sciences, Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/epsilon.v18i2.14164

Abstract

Research in mathematics and statistics can be categorized into two main types: analytical-theoretical research and applied-practical research, both of which make significant contributions to statistical analysis. This research is particularly relevant to the analysis of large-scale binary variables, where the binomial distribution is often used as the basis for computation. In such cases, the normal distribution can serve as an approximation to the binomial distribution, reducing the complexity of calculations. This study aims to demonstrate that the normal distribution can be used as an approximation for the binomial distribution. Two proof methods are presented: one utilizing the moment-generating function and the other employing Stirling's formula. The methodology involves a literature review by gathering and analyzing various relevant references. The findings indicate that as the value of ???? n increases, the difference between calculations using the binomial and normal distributions approaches zero exponentially.
Perancangan Aplikasi Website Pengelolaan Surat Masuk dan Keluar Dengan Menggunakan Metode Design Thinking Studi Kasus: Rektorat UKDW Priagung Satriyotomo; Mahastama, Aditya Wikan; Santosa, R. Gunawan
Jurnal Terapan Teknologi Informasi Vol 8 No 2 (2024): Jurnal Terapan Teknologi Informasi
Publisher : Fakultas Teknologi Informasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21460/jutei.2024.82.366

Abstract

Letters are one of the most common forms of communication in people's daily lives. Activities related to letters are commonly referred to as correspondence. Duta Wacana Christian University Yogyakarta is one of the institutions where correspondence activities are still carried out for internal organizational purposes Initially, correspondence activities at UKDW were still done manually by using physical letters, which were sent to the intended address by asking people to deliver them directly. However, the correspondence process is becoming less efficient. The process that must be passed is quite long, so it takes a lot of time and energy. This incoming and outcoming lettters management website was designed to help and facilitate UKDW employees in carrying out correspondence activities, which were formerly performed manually, through the use of a website. This research uses design thinking as the design method. The Design Thinking method consists of several steps: Empathize, Define, Ideate, Prototype, and Testing. For the testing phase, the author uses the Usability Testing as a method to evaluate the effectiveness, efficiency, and user satisfaction of the website.
Pelatihan Cara Berpikir Simbolik-Matematik di SMA BOPKRI 2 Yogyakarta Santosa, Raden Gunawan; Tampubolon, Junius Karel
International Journal of Community Service Learning Vol. 4 No. 1 (2020): February 2020
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (644.099 KB) | DOI: 10.23887/ijcsl.v4i1.23099

Abstract

Symbolic-Mathematical Thinking is a technique of thinking to solve mathematical problems. This technique is the result of a combination of Symbolic Logic and Mathematics. In general there are three symbolic logic activities that are applied to Mathematics, namely reading symbols, logical equivalents and logical implications.                 This Pengabdian kepada Masyarakat (PkM)  has activities to train Symbolic-Mathematical  thinking using 15 strategies for BOPKRI 2 high school students.                 The results of this training are three important things. The first result is the type of problem that is most difficult for students to face is the type of problem that requires drawing conclusions that refer to standard mathematical definitions. The second thing is for the type of use of model settlement strategies in a system and the type of seeing patterns, students tend to be able to solve problems after being given instructions on how the model fits the problem and the pattern the problem has. Whereas the third is from two groups of students the class turns out that the continuous class attending the training gets more symbolic-mathematical thinking skills improvement than the other classes.
ESENSI DAN PROSES PEMBUKTIAN EKUIVALENSI LOGIS MENGGUNAKAN SIMBOL LINGKARAN PUTIH DAN LINGKARAN HITAM Tampubolon, Junius Karel; Santosa, Raden Gunawan
JUPIKA: JURNAL PENDIDIKAN MATEMATIKA Vol. 8 No. 1 (2025): Volume 8 Nomor 1 Maret 2025
Publisher : Program Studi Pendidikan Matematika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/jupika.v8i1.5368

Abstract

The essence of the equivalence of P and Q is a condition that shows that P and Q have the same meaning based on the established reference. Achieving equivalence between P and Q involves transforming the form of P into Q while consistently obeying the established reference. The process of transforming P into Q using the symbols white circle and black circle while maintaining their equivalence is known as the equivalence step. The essence of logical equivalence steps are simplification, substitution and construction. The purpose of this study is to explore the process of the equivalence step more deeply to simplify the expression of propositions and ensure that the meaning of the symbols remains consistent and does not change the meaning of its original context after the equivalence step is carried out. The method used in this study has four stages, namely the preparation of equivalence guidelines, the development of problem-solving questions, simulation experiments, and the last is error evaluation. This study concludes that errors in the equivalence step often occur due to misunderstandings in the use of logical relationships such as "and," "or," and "if-then." Furthermore, incorrect equivalence steps can also occur due to inconsistent steps, steps that do not follow the rules of precedent, and steps that result in contradictions.
Perancangan Website TMLESS Studio dengan Metode Design Thinking Yohanes Tennary Rinto Pradhana; Joko Purwadi; Raden Gunawan Santosa
Jurnal Terapan Teknologi Informasi Vol 9 No 2 (2025): Jurnal Terapan Teknologi Informasi
Publisher : Fakultas Teknologi Informasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21460/jutei.2025.92.378

Abstract

TMLESS Studio is an entertainment company based in Yogyakarta, Indonesia, which is engaged in content creation ranging from films and music videos to series and documentation. The documentation service offerings provided by TMLESS Studio are still carried out by introducing themselves directly to prospective customers or with the help of old customers who recommend their services to prospective customers. TMLESS Studio has tried to use social media as a marketing medium, but this is still considered to have no impact on service sales. The solution that will be carried out to help solve this problem is to design a website to display complete information on TMLESS Studio's work and documentation service offerings in one area. The TMLESS Studio website will be designed using the Design Thinking method which includes 5 stages, namely empathize, define, ideate, prototype, and test. At the test stage, testing will be carried out using the Single Ease Question (SEQ) using the help of Google Sites and Google Form to find out whether the tested website can overcome the initial problem. The results of the SEQ respondent data average test show that the website being tested is in the very easy category (average = 6.19). The results of the average test of Tasks 5, 6, 7, and 8 regarding information on works and services offered by TMLESS Studio are in the very easy category. The results of this test show that the application of the stages of the Design Thinking method and the implementation of SEQ in the design of the TMLESS Studio website being tested has succeeded in overcoming the problems and can be used as a permanent TMLESS Studio website.
Pelatihan Persiapan Olimpiade Sains Nasional Bidang Komputer Untuk Siswa SMA Pangudi Luhur Yogyakarta Lukito, Yuan; Chrismanto, Antonius Rachmat; Wibowo, Argo; Delima, Rosa; Santosa, Raden Gunawan; Haryono, Nugroho Agus; Wijana, Katon
GIAT : Jurnal Teknologi untuk Masyarakat Vol. 3 No. 1 (2024): Mei 2024
Publisher : Program Studi Sistem Informasi Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/giat.v3i1.9166

Abstract

Kompetisi Olimpiade Sains Nasional (OSN) yang rutin diselenggarakan setiap tahunnya membutuhkan persiapan dari siswa-siswa sekolah yang ingin mengikuti kompetisi tersebut.  SMA Pangudi Luhur Yogyakarta ingin mengikuti kompetisi tersebut dengan mengirimkan beberapa siswanya, sehingga membutuhkan pelatihan OSN untuk siswa-siswanya. Tim PKM dari Fakultas Teknologi Informasi bersedia untuk mengadakan pelatihan OSN dengan menyiapkan materi-materi dengan topik algoritma, logika dan aritmatika sesuai dengan silabus OSN.  Pelatihan dilaksanakan selama 14 pertemuan di kampus Universitas Kristen Duta Wacana.  Pelatihan tersebut telah berhasil dilaksanakan dengan baik dan berhasil memenuhi kebutuhan dari pihak sekolah. Pada materi algoritma didapatkan peningkatan rata-rata nilai post-test terhadap rata-rata nilai pre-test, yaitu meningkat dari 57,14 menjadi 97,14. Hasil evaluasi dari pelaksanaan pelatihan ini secara umum sudah baik dan sesuai kebutuhan, walaupun ada beberapa permasalahan seperti jadwal pelatihan yang terpaksa mundur dan tingkat partisipasi siswa yang makin menurun pada beberapa pertemuan akhir.
Co-Authors Aditya Wikan Mahastama Amanda A. Diadema Andree Anthony Antonius Rachmat Chrismanto Apul Prima S Argo Wibowo Bhernardin Erryco Gagah Pattriskak Budi Susanto CHARIS AMARANTINI Christian Puji Nugraha Dea Alverina Devian Ricko Hutama Devri Riza Setyawan Elisabeth Adelia Widjojo Erdoria Kristina Erick Kurniawan Ernawati, Lussy Florentinus Alvin Sebastian Gabriella Amelia Prasetyo Gani Indriyanta Handi Hermawan Harianto Kristanto Harianto Kristanto Hermawan, Handi Joko Purwadi Jong Jek Siang Junius Karel Junius Karel Tampubolon Junius Karel Tampubolon Junius Karel Tampubolon Katon Wijana Kevin Valiant Kezia Satyawati Kristanto G, Steven Kristian Adi Nugraha Leo Sendra Lidya Andriani Sunjoyo Lukas Chrisantyo A.A. Matahari Bhakti Nendya Matahari Bhakti Nendya, Matahari Bhakti Nita Christina Saputro Nugroho Agus Haryono Priagung Satriyotomo Purwadi, Joko Rendy Setiawan Restyandito Robby Triadi Susanto Rohani Utomo Rosa Delima Ruby Vidian Hartanto Samuel Gandang Gunanto Santosa Raharjanto Selvy Welianto Setiadi, Hendro Sri Suwarno Sri Suwarno Sudarma, Wayan Edi Theresia Herlina R. Wayan Edi Sudarma Willy Sudiarto Rahardjo Willy Sudiarto Raharjo Yetli Oslan Yetli Oslan Yohanes Tennary Rinto Pradhana Yuan Lukito Yuan Lukito