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All Journal Jurnal Fisika Unand Square : Journal of Mathematics and Mathematics Education MATHEdunesa El-Mal: Jurnal Kajian Ekonomi & Bisnis Islam Determinasi: Jurnal Penelitian Ekonomi Manajemen dan Akuntansi
Sari, Silvia Novita
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Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Perbandingan MAPE Metode Arima dan FTS Chen pada Peramalan Harga Minyak Mentah Widuri di Indonesia Ikhtiyar, Zakaria Bani; Sulistijanti, Wellie; Sari, Silvia Novita; Mahiruna, Adiyah
Square : Journal of Mathematics and Mathematics Education Vol. 6 No. 2 (2024)
Publisher : UIN Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/square.2024.6.2.23579

Abstract

The need for crude oil greatly affects economic activities on a micro and macro scale. Indonesia is one of the countries that produces crude oil, although the amount produced is not as large as countries in the Middle East. The global price of crude oil has a direct impact on Indonesia's rising fuel prices. To find out the world price of crude oil in the future, forecasting can be done. Widuri type crude oil is one of the crude oils that is a priority in Indonesia. This study compares the accuracy of forecasting the price of Widuri type crude oil with the MAPE accuracy calculation method and the forecasting method compared is the ARIMA method with the FTS Chen method.Keywords: forecasting, Oil, ARIMA, Fuzzy Time Series (FTS) Chen.
Berpikir Kritis Siswa dalam Menyelesaikan Masalah Matematika Kontekstual Terbuka Ditinjau dari Gaya Kognitif Reflektif dan Impulsif Sari, Silvia Novita; Rosyidi, Abdul Haris
MATHEdunesa Vol. 14 No. 1 (2025): Jurnal Mathedunesa Volume 14 Nomor 1 Tahun 2025
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/mathedunesa.v14n1.p175-194

Abstract

Critical thinking is one of the skills needed to solve problems. Cognitive style has an important role in developing critical thinking skills. This study aims to describe students' critical thinking in solving open contextual math problems based on reflective and impulsive cognitive styles. This research is a qualitative descriptive. The subjects in this study consisted of two students of VIII grade at junior high school in Surabaya who had reflective and impulsive cognitive styles. The instruments in this study were Matching Familiar Figure Test (MFFT), critical thinking test of contextual open-ended problems, and interview guidelines. The data of this study were analyzed based on critical thinking indicators adapted from Jacob & Sam's critical thinking indicators. The results showed that in general students with reflective and impulsive cognitive styles went through four stages of critical thinking namely clarification, assessment, inference, and strategy. Students with reflective cognitive style solve problems with clear and detailed steps and arguments, and the time required tends to be long. At the strategy stage, students are able to determine other different alternative solutions. Meanwhile, students with impulsive cognitive style solve problems with steps and arguments that are short and the time required tends to be fast. At the strategy stage, students tried to determine other different alternative solutions even though in the end they could not find them.
Perbandingan MAPE Metode Arima dan FTS Chen pada Peramalan Harga Minyak Mentah Widuri di Indonesia Ikhtiyar, Zakaria Bani; Sulistijanti, Wellie; Sari, Silvia Novita; Mahiruna, Adiyah
Square : Journal of Mathematics and Mathematics Education Vol. 6 No. 2 (2024)
Publisher : UIN Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/square.2024.6.2.23579

Abstract

The need for crude oil greatly affects economic activities on a micro and macro scale. Indonesia is one of the countries that produces crude oil, although the amount produced is not as large as countries in the Middle East. The global price of crude oil has a direct impact on Indonesia's rising fuel prices. To find out the world price of crude oil in the future, forecasting can be done. Widuri type crude oil is one of the crude oils that is a priority in Indonesia. This study compares the accuracy of forecasting the price of Widuri type crude oil with the MAPE accuracy calculation method and the forecasting method compared is the ARIMA method with the FTS Chen method.Keywords: forecasting, Oil, ARIMA, Fuzzy Time Series (FTS) Chen.
Analisis Radiofarmaka Tc-99m Hynic Folate Pada Pasien Kanker Prostat Menggunakan Teknik Region Of Interest (ROI) Sari, Silvia Novita; Milvita, Dian; Nazir, Fadil
Jurnal Fisika Unand Vol 10 No 1 (2021)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.10.1.29-33.2021

Abstract

Telah dilakukan penelitian tentang analisis biodistribusi 99mTc-HYNIC Folate pada pasien kanker prostat menggunakan teknik region of interest (ROI). Penelitian dilakukan terhadap 15 data pasien kanker prostat tahun 2013 dalam menentukan biodistribusi 99mTc-HYNIC Folate pasien kanker prostat. Citra pasien diolah menggunakan teknik ROI dan menggunakan software Statistica 10. Hasil penelitian menunjukkan biodistribusi dari radiofarmaka 99mTc-HYNIC Folate berbeda-beda pada daerah kepala, dada, perut, panggul bagian anterior maupun posterior. Akumulasi radiofarmaka pada bagian anterior seluruh tubuh yaitu 6,818 mCi lebih tinggi dibandingkan seluruh tubuh bagian posterior yaitu 5,109 mCi. Korelasi antara dosis injeksi dengan akumulasi radiofarmaka 99mTc-HYNIC Folate pada seluruh tubuh anterior dan posterior didapatkan hubungan lemah dan tidak signifikan (tidak bermakna) pada setiap tubuh pasien kanker postat. A study on the analysis biodistribution of 99mTc-HYNIC Folate in prostate cancer patients using the region of interest (ROI) technique in the in-vivo laboratory of the TNK group on the TNKBN PTKMR-Batan group, Pasar Jum’at, South Jakarta. The study was conducted on 15 data on prostate cancer patients in 2013 using 99mTc-HYNIC Folate radiopharmaceutical that was injected into the patient’s body. The patient image was processed using the ROI technique using the Statistica 10 software. The results showed the highest biodistribution of the 99mTc-HYNIC Folate radiopharmaceutical in the abdominal area. The radiopharmaceutical accumulation entire body’s anterior 6.818 mCi higher than the whole posterior part of  the body, namely 5.19 mCi. The correlation between the injection dose and the radiopharmaceutical accumulation of 99mTc-HYNIC Folate in the entire anterior and posterior body was weak and insignificant in very prostate cancer patient body.
PENGARUH JOB STRESS DAN JOB INSECURITY TERHADAP TURNOVER INTENTION KARYAWAN RETAIL INDOMARET & ALFAMART SOLO RAYA Sari, Silvia Novita; Aprilia, Annastasya; Mahesti, Aura Eri Ratna; Ratnasih, Dwi Ayu; Istiqomah, Adelia Putri; Natalya, Angely Cris
Determinasi: Jurnal Penelitian Ekonomi Manajemen dan Akuntansi Vol. 3 No. 3 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/determinasi.v3i3.494

Abstract

This study aims to analyze the influence of job stress and job insecurity on turnover intention among employees of Indomaret and Alfamart in the Solo Raya region. Utilizing a quantitative survey approach, data were collected from 384 respondents through a questionnaire employing a Likert scale as the measurement tool. Regression analysis results indicate that job stress significantly and positively affects turnover intention, with a regression coefficient of 0.492. Similarly, job insecurity also demonstrates a significant positive relationship, as reflected by a regression coefficient of 0.399. The R-squared value of 39.9% suggests that these two independent variables collectively explain variations in turnover intention, although external factors also play a role. These findings highlight that work-related stress and job insecurity are key determinants driving employees' desire to leave their organizations. Therefore, strategic efforts are required to manage the work environment effectively to mitigate the risk of turnover intention. This study offers significant practical implications for human resource management policy development, particularly in enhancing employee retention in the retail sector.
The Influence of Islamic Financial Literacy and Service Ease of Use on Customers’ Decisions to Use Islamic Digital Banking Products with Islamic Financial Inclusion as a Mediating Variable Sari, Silvia Novita; Sholahuddin, Muhammad
El-Mal: Jurnal Kajian Ekonomi & Bisnis Islam Vol. 7 No. 2 (2026): El-Mal: Jurnal Kajian Ekonomi & Bisnis Islam
Publisher : Intitut Agama Islam Nasional Laa Roiba Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47467/elmal.v7i2.11410

Abstract

This study aims to analyze the influence of Islamic financial literacy and the ease of use of digital services on customers’ decisions to use Islamic digital banking products, with Islamic financial inclusion as a mediating variable. The research employs a quantitative approach using a survey method. Data were collected through questionnaires distributed to Islamic bank customers who use digital services in Indonesia. Data analysis was conducted using the Partial Least Squares–Structural Equation Modeling (PLS-SEM) method with the assistance of SmartPLS 4 software. The results indicate that Islamic financial literacy and the ease of use of digital services have a positive and significant effect on customers’ decisions to use Islamic digital banking products. In addition, both variables also have a positive and significant influence on Islamic financial inclusion. Islamic financial inclusion, in turn, has a positive effect on customers’ decisions and is able to mediate the relationship between Islamic financial literacy, the ease of use of digital services, and the decision to use Islamic digital banking products. The novelty of this study lies in the development of an integrative research model that combines Islamic financial literacy and the ease of use of digital services by incorporating Islamic financial inclusion as a mediating variable within the context of digital Islamic banking. This study is expected to enrich academic literature on customer decision behavior and provide practical implications for Islamic banking institutions in enhancing inclusive and sustainable digital service adoption.
Co-Authors Abdul Haris Rosyidi Aprilia, Annastasya Dian Milvita Fadil Nazir Ikhtiyar, Zakaria Bani Istiqomah, Adelia Putri M. Sholahuddin Mahesti, Aura Eri Ratna Mahiruna, Adiyah Natalya, Angely Cris Ratnasih, Dwi Ayu Sulistijanti, Wellie