Article Per Year (5 Year)
p-Index From 2020 - 2025
6.658
P-Index
This Author published in this journals
All Journal GEMA TEKNOLOGI METANA Jurnal Kesehatan Lingkungan indonesia JURNAL AKUNTANSI DAN AUDITING Jurnal S2 Pendidikan Matematika Jurnal Ilmiah Pendidikan Dasar Techno LPPM Jurnal Varidika JIPM (Jurnal Ilmiah Pendidikan Matematika) Jurnal Manajemen Keuangan Publik Syntax Literate: Jurnal Ilmiah Indonesia BAREKENG: Jurnal Ilmu Matematika dan Terapan JSiI (Jurnal Sistem Informasi) QARDHUL HASAN: MEDIA PENGABDIAN KEPADA MASYARAKAT Lex Librum: Jurnal Ilmu Hukum Jurnal Kartika Kimia Journal of Humanities and Social Studies Journal of Science Innovare FITOFARMAKA: Jurnal Ilmiah Farmasi EKOLOGIA : Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup Journal of Innovation and Future Technology (IFTECH) Jurnal Untuk Masyarakat Sehat (JUKMAS) Jurnal Aisyah : Jurnal Ilmu Kesehatan Jurnal Kebijakan Pemerintahan NUCLEUS: Jurnal Sains dan Teknologi INOPENDAS: Jurnal Ilmiah Kependidikan Journal of Earth and Marine Technology (JEMT) Jurnal Pengabdian kepada Masyarakat Jurnal Pengabdian Kepada Masyarakat JITEL (Jurnal Ilmiah Telekomunikasi, Elektronika, dan Listrik Tenaga) Jurnal Abdimas Kartika Wijayakusuma Pharmaceutical Sciences and Research (PSR) Helium: Journal of Science and Applied Chemistry Jurnal Abdi Inovatif : Pengabdian kepada Masyarakat Eduvest - Journal of Universal Studies Indonesian Journal of Advanced Research (IJAR) Komunita: Jurnal Pengabdian dan Pemberdayaan Masyarakat JGSD : Jurnal Guru Sekolah Dasar al Kimiya : Jurnal Ilmu Kimia dan Terapan Proceeding Of International Conference On Education, Society And Humanity IJHABS Artha Imperium: Jurnal Pengabdian Kepada Masyarakat
Sutanto Sutanto
Universitas Pakuan
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities 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 Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Veterinary Other

Published : 65 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 65 Documents
Search

 3   4   5   6   7 
GAME THEORY AND MARKOV CHAIN ANALYSIS OF THE DISPLACEMENT OF SHOPPING MALL VISITORS IN SURAKARTA CITY Rizkita, Nabiella Zahra; Sutanto, Sutanto; Kurdhi, Nughthoh Arfawi
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 19 No 2 (2025): BAREKENG: Journal of Mathematics and Its Application
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol19iss2pp1047-1056

Abstract

The era of globalization has led to changes in social patterns and lifestyles. With these changes, shopping malls were built to fulfill the community’s needs. This study aims to analyze the displacement of visitors in three shopping malls in Surakarta City, namely Solo Paragon Mall, Solo Grand Mall, and Solo Square, using game theory and the Markov chain. Game theory is used to determine the optimal strategy of each shopping mall based on six indicators of visitor satisfaction, namely product diversity, presence of transportation modes, distance, price, facilities, and services. Saddle points are obtained by pure strategy. The calculation results with the game theory method resulted in three competitions. The first competition between Solo Paragon Mall and Solo Grand Mall obtained the optimal strategy of Solo Paragon Mall is product diversity. At the same time, Solo Grand Mall is the existence of transportation modes. The second competition between Solo Paragon Mall and Solo Square obtained the optimal strategy of Solo Paragon Mall, which is product diversity, while Solo Square's optimal strategy is service. Lastly, the third competition, Solo Grand Mall and Solo Square, obtained the optimal strategy of Solo Grand Mall is the presence of transportation modes and Solo Square is service. Markov chain is used to calculate the transition probability of visitors and steady state, which shows that Solo Paragon Mall is more desirable with a steady state probability of 0.4459, followed by Solo Square 0.3584 and Solo Grand Mall 0.1957. The results of this study can help shopping malls evaluate and improve their strategies to increase loyalty and attract new visitors.
Mengubah Limbah Kayu Menjadi Produk Bernilai Tinggi di Industri Kreatif Nughthoh Arfawi Kurdhi; Saputro, Dewi Retno Sari; Widyaningsih, Purnami; Sutanto, Sutanto; Setiyowati, Ririn; Sudibyo, Nugroho Arif
PaKMas: Jurnal Pengabdian Kepada Masyarakat Vol 4 No 2 (2024): November 2024
Publisher : Yayasan Pendidikan Penelitian Pengabdian Algero

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54259/pakmas.v4i2.3252

Abstract

The UMKM involved in this community partnership program is engaged in the production of teak wood furniture. The issues currently faced are (1) a limited range of furniture products and (2) traditional management and marketing methods. This study aimed to implement technological induction to enhance productivity, creativity, and competitiveness within these UMKMs. The technological induction involved providing modern production tools for creating innovative products and developing an application boot program and server computer to enhance marketing efforts. A mixed-methods approach was used, combining case study observations and user-centred design principles to create technological solutions. The program's outcomes were assessed through partner training and mentoring, employing a problem-solving approach to address post-implementation challenges. The study found that introducing advanced production tools and digital marketing strategies significantly increased the variety of products, streamlined production processes, and expanded market reach, positioning the UMKMs for improved competitiveness in the national market. This research underscores the importance of integrating technology into small-scale industries for sustainable growth. Future efforts should focus on scaling these practices to other creative sectors for broader economic impact.
The Role of Kartika Eka Paksi's Doctrine in Supporting The Realization of Strengthening The National Defense Strategy in The Perspective of 5 Functions Yudi Hartono, Achdwiyanto; Arifin, Zainal; Sutanto, Sutanto
Eduvest - Journal of Universal Studies Vol. 5 No. 4 (2025): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v5i4.33272

Abstract

This research examines the limitations of Indonesia's defense strategy, focusing on the Indonesian Army Aviation Corps (Puspenerbad) and its underutilized potential in national defense. Despite the Indonesian National Army's critical role in safeguarding the nation’s sovereignty, the current defense policies are fragmented and primarily emphasize core defense components, leaving aviation support functions insufficiently integrated. The study uses a qualitative approach, gathering data from journals, books, and official documents to analyze Puspenerbad’s five key functions: combat intelligence, maneuver, fire support, protection, and logistical assistance. The findings suggest that optimizing these functions could significantly enhance Indonesia's defense capabilities in addressing both military and non-military threats. The research highlights the need for a more comprehensive defense strategy, proposing that an improved aviation corps could strengthen national security by better integrating aviation support into the broader defense framework. This study offers valuable insights for policymakers and military planners, aiming to improve operational effectiveness and better prepare Indonesia for emerging security challenges
Dekomposisi Transformasi Wavelet Kontinu dengan Filter Wavelet Morlet Adzakie, Haabi Luckmanoor; Saputro, Dewi Retno Sari; Sutanto, Sutanto; Widyaningsih, Purnami; Khomariah, Nurul
NUCLEUS Vol 6 No 01 (2025): NUCLEUS
Publisher : Neolectura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37010/nuc.v6i01.2008

Abstract

Analyzing high-dimensional data often presents unique challenges, necessitating dimension reduction methods, one of which is the wavelet approach. Wavelets function as a transformation that automatically separates data into several components, then analyzes each component based on a resolution appropriate to its time scale. The Continuous Wavelet Transform (CWT) is a dimension reduction technique that relies on multiresolution decomposition to address modeling problems by generating local signal representations in the time and frequency domains (scales) continuously. Through multiresolution decomposition, trends in time series data can be separated. This transformation enables the transfer of data from the original domain into the wavelet domain for further analysis, as well as facilitating the separation of signals at both low and high frequencies more accurately. This study revisits the use of CWT, which divides data into various scales or frequency components and analyzes each part with the appropriate resolution. In this context, the Morlet wavelet filter is used. The results of the study indicate that the Morlet wavelet in CWT has advantages in detecting transient frequency components and local oscillation phenomena, making it highly effective in analyzing complex signals.
Analysis of the Hankel Matrix in Embedding Using the Singular Spectrum Analysis (SSA) Method Ni’am, Dafi’ Ichsani Aysar; Saputro, Dewi Retno Sari; Sutanto, Sutanto
Indonesian Journal of Advanced Research Vol. 4 No. 5 (2025): May 2025
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/ijar.v4i5.14340

Abstract

Singular Spectrum Analysis (SSA) is an effective method of decomposition of time series for separating key components in data, such as trends, seasonality, and noise. This study aims to analyze the role of Hankel matrix in the SSA embedding process and how window length (L) selection can affect the effectiveness of component separation in data time series. In this study, the data used includes public data that can be influenced by seasonal factors and unexpected events, such as natural disasters or regulatory changes. The research process begins with the data preprocessing stage, followed by the embedding stage to form a matrix used in decomposition with Singular Value Decomposition (SVD). To evaluate the similarity of separate components, w-correlation is used. The results show that the selection of optimal window lengths, in the range of N/4 < L < N/2 is very important to maintain a balance between temporal information and matrix dimensions. With the right window selection, the embedding process in SSA can be more effective in separating the trending, seasonal, and noise components in the data pattern. By understanding the structure of the Hankel matrix and selecting the right parameters, the embedding process in SSA can be more effective in separating the components of the time series and preserving temporal information.
Architecture Elements of the Lemat Formation of the Lubuk Bernai Region, Batang Asam District, Tanjung Jabung Barat Regency, Jambi Province Daryono, Sapto Kis; Sutanto, Sutanto; Prasetyadi, Carolus; Paripurno, Eko Teguh
Journal of Earth and Marine Technology (JEMT) Vol 3, No 1 (2022)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2022.v3i1.3396

Abstract

The study of facies analysis and interpretation of the depositional environment of the Lemat Formation located at Bukit Tiga Puluh aims to clarify the problems found in Paleogene sediments in the South Sumatra Basin. A detailed analysis of the fluvial facies has been carried out in the Lubuk Bernai track. A number of observations, profiling, and measured stratigraphic section have been carried out. The stratigraphy of the study area can be divided into 5 units from old to young, namely the Mentulu-metamorphic sandstone unit, Lemat conglomerate unit, Lemat gravel-sandstone unit, Benakat volcanic-siltstone unit, and the alluvial deposit unit. The stratigraphic relationship between Mentulu metamorphic-sandstone unit and Lthe emat conglomerate unit is nonconformity. The relationship between Lthe emat conglomerate unit and Lemat gravel-sandstone unit and Benakat volcanic-siltstone unit is interfingering. The relationship between alluvial deposit units with Lemat conglomerate units and Lemat gravel-sandstone units is aan ngular unconformity. Analysis of lithofacies and architectural elements of the study area showed a fluvial depositional environment. The resulting architectural elements are 8 associations: SG (sedimentary gravity flow), GB (gravel bedform), SB (sandy bedform), CH (channel), DA (downstream accretion), HO (scour-hollow fill), AC (abandoned channel) and FF (overbank fine). The depositional environment of the Lemat Formation; Lemat conglomerate unit in alluvial fans environment, Lemat gravel sandstone unit in the shallow environment, gravel-bed braided river. In the Benakat tuffaceous-siltstone unit, it was deposited in a flashy, ephermal, sheet flood, sand-bed river environment.
Facies and architectural analysis of Paleogen fluvial deposits of the measured section of Rambangnia and Air Napalan Rivers in Palembang Sub-basin Daryono, Sapto Kis; Prasetyadi, Carolus; Paripurno, Eko Teguh; Sutanto, Sutanto; Faozi, Aditya Zaenalfi
Journal of Earth and Marine Technology (JEMT) Vol 3, No 1 (2022)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2022.v3i1.3606

Abstract

Paleogene fluvial deposits have an important problem as pre-rift deposits, which occur before or at the same time as the formation of the basin. The research results on facies analysis and interpretation of the depositional environment of Paleogene deposits located in the Garba Hills will later explain and describe the history of the formation and stratigraphic evolution of sedimentary rocks in the South Sumatra Basin, reflected in the lithological and facies characteristics. The facies analysis was carried out on a stratigraphic cross-section with a thickness of ± 107.37 meters and ± 11.06 meters on the measurement path of the Rambangnia River and Air Napalan River, which are located in the Ogan Komering Ulu area, South Sumatra. Seven lithofacies developed on two measured paths are matrix supported gradded gravel (Gmg), gravel matrix supported Massive (Gmm), through cross-bedded (St), massive sandstone (Sm), horizontally bedded sandstones (Sh), parallel laminated siltstone and claystone (F1), massive siltstones and mudstones (Fsm). Asosiasi fasies didapatkan berupa Sedimentary Gravity Flow (SG), Gravel Bars (GB), Sandy Bedforms  (SB), channel (CH), Overbank fine  (FF). The interpretation of the depositional environment shows a fluvial environment, the type of braided river with a gravel braided rivers model with sedimentary gravity flows.Paleogene fluvial deposits have an important problem as pre-rift deposits, which occur before or at the same time as the formation of the basin. The research results on facies analysis and interpretation of the depositional environment of Paleogene deposits located in the Garba Hills will later explain and describe the history of the formation and stratigraphic evolution of sedimentary rocks in the South Sumatra Basin, reflected in the lithological and facies characteristics. The facies analysis was carried out on a stratigraphic cross-section with a thickness of ± 107.37 meters and ± 11.06 meters on the measurement path of the Rambangnia River and Air Napalan River, which are located in the Ogan Komering Ulu area, South Sumatra. Seven lithofacies developed on two measured paths are matrix supported gradded gravel (Gmg), gravel matrix supported Massive (Gmm), through cross-bedded (St), massive sandstone (Sm), horizontally bedded sandstones (Sh), parallel laminated siltstone and claystone (F1), massive siltstones and mudstones (Fsm). Asosiasi fasies didapatkan berupa Sedimentary Gravity Flow (SG), Gravel Bars (GB), Sandy Bedforms  (SB), channel (CH), Overbank fine  (FF). The interpretation of the depositional environment shows a fluvial environment, the type of braided river with a gravel braided rivers model with sedimentary gravity flows.
Efektivitas Penggunaan Media Pembelajaran Digital Dalam Meningkatkan Minat Dan Hasil Belajar Siswa Sdn 1 Sarirejo Wiyati, Indar; Sutanto, Sutanto; Santoso, Santoso; Shokib Rondli, Wawan; Raharjo, Ronal
JGSD: Jurnal Guru Sekolah Dasar Vol. 2 No. 1 (2025): Jurnal Guru Sekolah Dasar Bulan Juni 2025
Publisher : Jurnal Guru Sekolah Dasar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70277/jgsd.v2i1.5

Abstract

Penelitian ini bertujuan untuk mengeksplorasi efektivitas penggunaan media pembelajaran digital dalam meningkatkan minat dan hasil belajar siswa di SDN 1 Sarirejo Kecamatan Ngaringan Kabupaten Grobogan. Metode penelitian yang digunakan adalah kualitatif naratif, dengan pendekatan narasi pengalaman dari guru dan siswa selama proses pembelajaran yang menggunakan media digital. Data dikumpulkan melalui wawancara mendalam dengan guru dan siswa, observasi kelas, serta analisis dokumen pembelajaran. Hasil penelitian menunjukkan bahwa penggunaan media pembelajaran digital, seperti PowerPoint, video interaktif, dan aplikasi pembelajaran, secara signifikan meningkatkan minat siswa terhadap pembelajaran. Siswa menjadi lebih aktif, antusias, dan tertarik mengikuti materi yang disampaikan. Selain itu, media digital juga membantu meningkatkan hasil belajar siswa, yang tercermin dalam peningkatan nilai ulangan harian dan kemampuan siswa dalam memahami materi pelajaran. Namun, penelitian ini juga mengidentifikasi beberapa kendala dalam implementasi, seperti keterbatasan akses internet di beberapa area, kurangnya keterampilan teknis dari sebagian guru, serta keterbatasan perangkat teknologi yang tersedia di sekolah. Meskipun demikian, kesimpulan dari penelitian ini adalah bahwa media pembelajaran digital efektif dalam meningkatkan minat dan hasil belajar siswa di pendidikan dasar, asalkan didukung oleh infrastruktur teknologi yang memadai dan pelatihan yang cukup bagi guru.
ANALYSIS OF THE IMPLEMENTATION OF MERDEKA CURRICULUM ON ANTI-CORRUPTION EDUCATION Sutanto, Sutanto; Darmuki, Agus; W, Sri Surachmi; Ismaya, Erik Aditia
INOPENDAS: Jurnal Ilmiah Kependidikan Vol 7, No 2 (2024): Inopendas : Jurnal Ilmiah Kependidikan (Agustus 2024)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/jino.v7i2.12654

Abstract

This study aims to analyze the implementation of Merdeka Curriculum in supporting anti-corruption education at SD Negeri 1 Pulongrambe, Tawangharjo District. The research method used is narrative qualitative with a descriptive approach. Data were collected through in-depth interviews, observation, and document analysis. The results showed that the implementation of Merdeka Curriculum provides flexibility for teachers to integrate anti-corruption values in learning activities. This finding provides new insights into the effectiveness of the Merdeka Curriculum in shaping students character with integrity. The conclusion of this study emphasizes the importance of policy support and teacher training in implementing anti-corruption education.
INSPIRATION IN LEARNING: EFFORTS TO BUILD LEARNING ENTHUSIASM IN JUNIOR HIGH SCHOOL Sutanto, Sutanto; Suhermanto, Suhermanto
PROCEEDING OF INTERNATIONAL CONFERENCE ON EDUCATION, SOCIETY AND HUMANITY Vol 2, No 1 (2024): Second International Conference on Education, Society and Humanity
Publisher : PROCEEDING OF INTERNATIONAL CONFERENCE ON EDUCATION, SOCIETY AND HUMANITY

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This research explores and analyzes the learning strategies and approaches used at SMP NU 07 Wringin Bondowoso to form students' enthusiasm for learning. In the context of education in an era that continues to develop, it is essential to understand how a school can inspire and motivate students to excel academically and develop their potential. Researchers collected data through several stages, such as observation and direct observation at the research site. Interview interviewing several informants at the research location. This research methodology involved classroom observations, interviews with teachers, and analysis of documents related to the curriculum and learning programs at SMP NU 07. The data collected was then analyzed qualitatively to identify critical factors that support the formation of enthusiasm for learning at school. The research results show that SMP NU 07 Wringin Bondowoso carries a learning approach that applies Islamic values and Nahdlatul Ulama (NU) traditions on a moral and ethical basis. In addition, this school actively applies innovative and technology-based learning methods to increase student engagement. This learning program is designed to arouse interest in learning, increase creativity, and foster a spirit of leadership and entrepreneurship among students
Co-Authors Achmad Rodhi Ade Heri Mulyati, Ade Heri Ade Susanti Adeldarma Hikmatullah, Abdillah Adhitama, Ria Puan Adi Nugroho, Khoiruddin Adzakie, Haabi Luckmanoor Agus Darmuki Albar, Luthfirmansyah Ali Manshur Amelia, Cynthia Rizky Ananda Putra, Fajar Andreas N, Djoko Antoni Wibowo Apriyanti, Mahyuni Azijah, Izattul Baharum, Aslina Bahtera, Checka Bambang Pramudya Bina Lohita Sari Budiyono Budiyono Christy, Alexander Yonathan Danang Widjajanto Daryono, Sapto Kis Dewi Nur Anisa, Shopia Dewi Retno Sari Saputro Dewi Retno Sari Saputro, Dewi Retno Dismas Suparmo Dwi Indriani Dwi Purnama Dwiyana, Amelia Eka Herlina Eka Intan Kumala Putri Eko Teguh Paripurno Erik Aditia Ismaya F. Harsono, Cecilia Faozi, Aditya Zaenalfi Farida Nuraeni Fathurrachman, Muhammad Fathurrachman, Muhammad Guntur S, Guntur Gymnasti, Alista Dwis Handayani, Rr. Sri Harefa, Faonaso Harsono, Cecilia F Harun Al Rasyid Henny Nuraeny Heri, Ade Herman Fikri, Herman Hermawan, Ujang Huswatun Hasanah Hutabarat, David Hotman Imam Ghozali Indriyani, Silvia Iryani, Ani Iryani, Ani J., Tania Jhons Fatriyadi Suwandi Jordy Kantona, Emmanuel Keumala Hayati Khomariah, Nurul Kusumastuti, Sri Lestari latifah K Darusman Lestari, Arifah Mufidah Linda Jati Kusumawardani Maharani, Restu Dewinta Marsudi Utoyo Melianus Salakory, Melianus Mohammad Kanzunnudin, Mohammad Muhammad Fathurrahman Muhammad Irfan Muhammad Rizki Saputra, Muhammad Rizki Mutadin, Ali Navalino, Djoko A Nila Sari, Fadhila Ni’am, Dafi’ Ichsani Aysar Nor Hayati, Saropa Nughthoh Arfawi Kurdhi, Nughthoh Arfawi Nugraha, Fikri Nugroho Arif Sudibyo Nurani Nurani Nurulia Susanti, Nurulia Nuryani, Ely Oktavia Kusuma, Rima Palupi, Mustika Pandini, Sapitri Pertiwi, Aditya Endah Pradina, Sisca Chandra Prasetyadi, Carolus Purnami Widyaningsih Putera Khano, Muhammad Nazhif Abda Qoonita, Najihah Raharjo, Ronal Ramadhan, Farid Reni Zuraida Ririn Setiyowati Riyantini, Atik Rizkita, Nabiella Zahra Ruhiawati, Irma Yunita S. Anwar Sabania, Ikrimah Nur Sabdono, Wilis Aji SANTOSO SANTOSO Septiningsih, Riana Setiyowati, Ririn Shobri, Taufiq Sidiq, Krisna Siti Fatimah Siti Warnasih Soeyoko Soeyoko Sri Widodo Sugeng Juwono Mardihusodo Suhermanto, Suhermanto Sukresna, Yobi Sutanto Sutarto Sutarto Sutoyo, Muhammad Rayhan Suyud Warno Utomo Tamri, Tamri Teti Syahrulyati, Teti Tri Aminingsih Trianingtyas, Laela Ufianah, Ufianah Uswatun Hasanah, Laili W, Sri Surachmi Wawan Shokib Rondli Winaro, Bowo Wiyati, Indar Wuryaningsih Dwi Sayekti Yudi Hartono, Achdwiyanto Yulian Syahputri Yusgiantoro, Purnomo Zahra, Mutiara Zainal Arifin