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All Journal International Journal of Evaluation and Research in Education (IJERE) Pythagoras: Jurnal Matematika dan Pendidikan Matematika Jurnal Penelitian dan Pengembangan Pendidikan Jurnal Pengajaran MIPA Journal on Mathematics Education (JME) Jurnal Infinity Kreano, Jurnal Matematika Kreatif-Inovatif Journal on Mathematics Education (JME) Lentera Pendidikan : Jurnal Ilmu Tarbiyah dan Keguruan Jurnal Riset Pendidikan Matematika AKSIOMA: Jurnal Program Studi Pendidikan Matematika Dinamika Jurnal Pendidikan Dasar Jurnal Penelitian Pendidikan Jurnal Elemen Journal of Research and Advances in Mathematics Education JPPM (JURNAL PENELITIAN DAN PEMBELAJARAN MATEMATIKA) JIPMat (Jurnal Ilmiah Pendidikan Matematika) AKSIOMA Jurnal Gantang Al-Jabar : Jurnal Pendidikan Matematika Math Didactic: Jurnal Pendidikan Matematika International Journal of Artificial Intelligence Research Union: Jurnal Ilmiah Pendidikan Matematika EDUHUMANIORA: Jurnal Pendidikan Dasar Pedagogik Pendidikan Dasar AKSIOLOGIYA : Jurnal Pengabdian Kepada Masyarakat Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Analisa PRISMA Indonesian Journal of Science and Mathematics Education MUST: Journal of Mathematics Education, Science and Technology Juring (Journal for Research in Mathematics Learning) PROCEEDING ICTESS (Internasional Conference on Technology, Education and Social Sciences) IndoMath: Indonesia Mathematics Education Journal of Honai Math JTAM (Jurnal Teori dan Aplikasi Matematika) Lentera: Jurnal Ilmiah Kependidikan MATEMATIKA DAN PEMBELAJARAN Beta: Jurnal Tadris Matematika Teorema: Teori dan Riset Matematika Jurnal Cendekia : Jurnal Pendidikan Matematika AT-TA`DIB Pelita : Jurnal Penelitian dan Karya Ilmiah JETL (Journal Of Education, Teaching and Learning) AL-ASASIYYA: Journal Of Basic Education JKPM (Jurnal Kajian Pendidikan Matematika) MEJ (Mathematics Education Journal) JP3M (Jurnal Penelitian Pendidikan dan Pengajaran Matematika) Jurnal Review Pendidikan dan Pengajaran (JRPP) Jurnal Studi Guru dan Pembelajaran JE (Journal of Empowerment) Gema Wiralodra Integral : Pendidikan Matematika JPMI (Jurnal Pembelajaran Matematika Inovatif) (JIML) JOURNAL OF INNOVATIVE MATHEMATICS LEARNING Jurnal Absis : Jurnal Pendidikan Matematika dan Matematika Attadib: Journal of Elementary Education Jurnal Abdi: Media Pengabdian Kepada Masyarakat Abdimasku : Jurnal Pengabdian Masyarakat Range : Jurnal Pendidikan Matematika Southeast Asian Mathematics Education Journal Journal of Didactic Mathematics Mosharafa: Jurnal Pendidikan Matematika These proceedings represent the work of researchers participating in The International Conference on Elementary Education (ICEE) which is being hosted by the Elementary Education Study Programme School of Postgraduate Studies, Universitas Pendidikan Jurnal Pedagogik Pendidikan Dasar INTERNATIONAL JOURNAL OF EDUCATION, INFORMATION TECHNOLOGY, AND OTHERS Unnes Journal of Mathematics Education Jurnal Cakrawala Pendas Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Journal of Mathematics Science and Computer Education Jurnal Ilmiah Ilmu Terapan Universitas Jambi Al-Irsyad: Journal of Education Science International Journal of Trends in Mathematics Education Research (IJTMER) JNPM (Jurnal Nasional Pendidikan Matematika) Badranaya: Jurnal Pengabdian kepada Masyarakat AL JABAR: Jurnal Pendidikan dan Pembelajaran Matematika IndoMath: Indonesia Mathematics Education JRAMathEdu (Journal of Research and Advances in Mathematics Education) SIGMA DIDAKTIKA: Jurnal Pendidikan Matematika Kreano, Jurnal Matematika Kreatif Inovatif Jurnal Elementaria Edukasia Jurnal Infinity MIMBAR PGSD FLOBAMORATA Journal on Mathematics Education Research Jurnal Pendidikan MIPA Journal on Mathematics Education Jurnal Pedagogi dan Inovasi Pendidikan Differential: Journal on Mathematics Education Jurnal Didaktik Matematika Al Ibtida: Jurnal Pendidikan Guru MI Eduma : Mathematics Education Learning and Teaching
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Strategi Penyelesaian Soal Cerita Siswa Sekolah Dasar: Analisis Hambatan Belajar Konsep Penjumlahan dan Pengurangan Bilangan Cacah Syarifah, Mufarrahatus; Suryadi, Didi; Prabawanto, Sufyani
Attadib: Journal of Elementary Education Vol 7, No 1 (2023): Attadib: Journal of Elementary Education
Publisher : Fakultas Agama Islam Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32507/attadib.v7i1.2825

Abstract

This research aims to describe the learning obstacles experienced by students in the concept of addition and subtracting whole numbers through the strategies used in solving word problems. This research is a qualitative descriptive study whose data was taken using tests and interviews. The test was given to 30 grade 3 students from two different elementary schools. Their answers were classified by error type and interviews were conducted to further explore how they arrived at solutions. For additional information, open interviews were conducted with each class teacher. Three types of learning obstacles were occured. The attitude of students who appear to be less confident in determining strategies and unsure of what to do with questions in the form of stories indicates the existence of ontogenic obstacle. Students' success in completing one situation and failing in another situation in the same concept indicates the existence of epistemological obstacle. Students' failure to recognize key words in the story that indicate addition or subtraction situations indicates didactic obstacle.
Hubungan Motivasi dan Kebiasaan Belajar terhadap Hasil Belajar Siswa Sekolah Dasar Negeri Kelas V pada Pelajaran Matematika di Kecamatan Sagulung Fatimah, Siti; Prabawanto, Sufyani; Adji, Sandra Sukmaning
Lentera: Jurnal Ilmiah Kependidikan Vol. 15 No. 1 (2022): Lentera
Publisher : STKIP PGRI Bandar Lampung

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

Abstract

State Primary School students in Sagulung district became the location of this research with the theme the relationship of motivation and learning habits toward to student achievement of fifth grade state primary school students. By involving teachers and students in Sagulung District as the population as well as the research sample. The method used is descriptive quantitative by looking at the description of the test results using statistical data to obtain the research results. The data collection techniques used observations, and questionnaires in which all the answers were analized. The research instrument was calibrated by using the validity and reliability coefficients. Validity was tested by using product moment correlation, while the research data were analyzed by using correlation techniques with multiple linear regression equations and path analysis. The results of research show that the testing done between motivation and Students' learning habits togetherly were indicated by the value of FCount is 39,252, while the value of Ftable = 3,097 because the Fcount > Ftable, it can be concluded that this study has a significant effect. While the value of the contribution of this research was 68.9% where the student achievement variable was explained by motivation and learning habits, while the remaining 31.1% was explained by other variables which is not examined in this research.
Mengeksplore aljabar awal di sekolah menengah: kombinasi analisis bibliometric dan meta analisis Fardian, Dilham; Suryadi, Didi; Prabawanto, Sufyani; Hayuningrat, Silfia
Jurnal Elemen Vol 10 No 2 (2024): May
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/jel.v10i2.25539

Abstract

The aims of this study is to analyze publications on early algebra in middle schools to contribute to the development of related literature. A total of 234 articles on early algebra published in various Scopus databases between 2013 and 2024 were retrieved and analyzed through a bibliometric analysis approach and 19 articles through a Comprehensive Meta Analysis (CMA). The results showed fluctuating trends in research related to early algebra in middle schools. The surge in publications using VOSviewer and RStudio from 2013 to 2024 did not align with a corresponding increase in average citations, contributing to a stagnation in the average citation per year. The noticeable upward trend in the volume of publications on early algebra since the beginning of 2013 indicates a dynamic and evolving research landscape in this field. This consistency suggests a widespread and sustained interest in early algebra research beyond the confines of a single country, further emphasizing its global relevance and significance. Integrating multimedia technology into early algebra instruction significantly enhances student learning outcomes. Moreover, access to technology and enhanced learning resources through technology integration can play a more crucial role in improving the effectiveness of early algebra learning in countries with lower income levels.
Enhancing mathematical problem-solving ability through project-based learning: A study of vocational high school student Jatisunda, Mohamad Gilar; Suryadi, Didi; Prabawanto, Sufyani
Jurnal Elemen Vol 10 No 3 (2024): September
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/jel.v10i3.26244

Abstract

This study aims to improve the mathematical problem-solving ability of students at Vocational High School (VHS) through implementing Project Based Learning (PjBL). The research method used was a quasi-experiment with a matching-only pretest-posttest control group design, with a sample of 64 students divided into two classes, namely experimental and control classes, each consisting of 32 students. The sampling technique used was purposive sampling, where the sample was selected based on specific criteria relevant to the research objectives. Data were collected using tests of mathematical problem-solving ability administered before (pre-test) and after (post-test) the treatment. Data were analyzed using an independent sample t-test and a two-way ANOVA test with univariate general linear model (GLM) analysis. The results showed a difference between the experimental and control groups before the treatment. However, after the treatment, the experimental group had higher mathematical problem-solving ability than the control group, including the improvement and interaction between PjBL implementation and the Early Mathematics Skills (EMS) category.
Penerapan Digital Mathematics Storytelling dalam Pembelajaran Matematika Pertiwi, Saffanah; Ahmad Zulfa Khotimi; Hadi; Indra Nurhidayat; Wenda Alifulloh; Sufyani Prabawanto
Jurnal ABDI: Media Pengabdian Kepada Masyarakat Vol. 10 No. 1 (2024): JURNAL ABDI : Media Pengabdian Kepada masyarakat
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/abdi.v10i1.27901

Abstract

Artikel ini mengusulkan pendekatan inovatif, yaitu digital mathematics storytelling, sebagai solusi untuk mengubah persepsi negatif siswa terhadap matematika. Digital mathematics storytelling mengintegrasikan narasi matematika dengan teknologi digital untuk menciptakan pengalaman pembelajaran yang menarik dan relevan. Metode yang digunakan adalah kegiatan pengabdian kepada masyarakat di MTs Sekolah Cinta Ilmu, Kabupaten Bandung, melibatkan dosen, mahasiswa, dan 34 siswa kelas IX. Kegiatan dilaksanakan selama satu hari dengan membuat konten digital berupa video berkelompok. Respon positif dari siswa menjadi indikator keberhasilan. Hasil analisis kualitatif menunjukkan variasi kreativitas siswa dan dampak positif penerapan digital mathematics storytelling. Video-video karya siswa mencerminkan peningkatan motivasi, pemahaman konsep, keterlibatan siswa, respons terhadap teknologi, dan keterampilan pemecahan masalah. Hasil proyek ini menyoroti pentingnya elemen kreatif dalam pengajaran matematika dan menegaskan bahwa cerita matematika dapat dengan mudah diintegrasikan ke dalam kurikulum matematika yang ada. Penerapan digital mathematics storytelling memiliki dampak positif dalam pembelajaran matematika di Sekolah Cinta Ilmu. Proyek ini menegaskan pentingnya kreativitas, kolaborasi, dan inovasi dalam pendidikan matematika. Diharapkan bahwa hasil dan pengalaman ini dapat menjadi inspirasi bagi upaya serupa di tempat lain untuk mengatasi tantangan dalam pembelajaran matematika.  
An An Exploration of High School Students’ Errors in Solving Trigonometry Problems Alfitri, Putri Armania Agustina; Kurniati, Nurdiyah; Prabawanto, Sufyani; Yulianti, Kartika
Jurnal Cendekia : Jurnal Pendidikan Matematika Vol 8 No 1 (2024): Jurnal Cendekia: Jurnal Pendidikan Matematika Volume 8 Nomor 1
Publisher : Mathematics Education Study Program

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cendekia.v8i1.2109

Abstract

Trigonometry plays an important role in the field of mathematics education, but in fact, some errors are identified. Therefore, this study aims to explore the students’ errors in solving trigonometry problems, especially in the sub-topics of trigonometric ratios. This is a qualitative study using a case study design. The subjects of this study were 35 students in grade 10 in one of the senior high schools in a district located in the Province of East Kalimantan. The research instruments were 1) a diagnostic test consisting of five essay problems about trigonometric ratios; 2) observation sheets; and 3) interview guidelines. The data was analyzed through three processes. They were: 1) data reduction, 2) data presentation, and 3) conclusion drawing or verification. The results show that the subjects made errors in solving trigonometric ratio problems, with the most errors made by subjects being errors in understanding concepts and writing algorithms. The causes of students making errors are due to the weak understanding of students' concepts, lack of student mastery of the prerequisite topics, the problems given being less varied, and students being in a hurry to solve problems.
Literasi Statistik Dalam Pembelajaran Matematika SD Melalui Kurikulum 2013 Alman, Alman; Tatang Herman; Sufyani Prabawanto; Yeni Dwi Kurino
Jurnal Elementaria Edukasia Vol. 6 No. 3 (2023): September
Publisher : Elementary Teacher Education Program, Majalengka University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/jee.v6i3.6351

Abstract

This research aims to investigate the implementation of statistical literacy at the elementary schools level within the mathematics curriculum. Statistical literacy is a essential skill that enables students to understand, analyze, and interpret data and information critically. In an era where information and data are abundant, having statistical literacy skills has become increasingly relevant and crucial for developing students' understanding of the world, which involves various data-based information. This study uses a qualitative approach by analyzing government regulation documents concerning the mathematics curriculum used at the elementary school level. The results of the research indicate that statistical literacy has not been fully integrated effectively into the elementary school mathematics curriculum. While there have been some efforts to incorporate statistical concepts into mathematics learning, there are still challenges in teaching data analysis skills and interpreting statistical information more deeply.
ATTITUDES TOWARD STATISTICS AND ACHIEVEMENT: BETWEEN STUDENTS OF SCIENCE AND SOCIAL FIELDS Dian Cahyawati; Wahyudin Wahyudin; Sufyani Prabawanto
Jurnal Infinity Vol 7 No 2 (2018): Volume 7 Number 2, INFINITY
Publisher : IKIP Siliwangi and I-MES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22460/infinity.v7i2.p173-182

Abstract

The purpose of this study was to explore students' attitudes toward statistics (ATS) based on the beginning and the end of learning, based on differences in fields of study, and examine its relationship with statistical acheivement. ATS was measured by an attitude instrument, namely The Survey of Attitudes toward Statistics (SATS) which consists of six dimensions (affective, cognitive competence, difficulty, value, interest, effort). Research respondents were undergraduate students who took lectures on statistical recognition that came from at one of the universities in South Sumatra. The results of the descriptive analysis showed the variation of ATS in each dimension of attitudes classified into positive, neutral, or negative attitudes. Although there are variations in the response of student attitudes in each dimension, but the results of statistical tests have not been able to show differences in attitudes between the beginning and the end of learning in each dimension. The differences in attitudes between the beginning and the end of learning that are statistically significant are in the dimensions of affective, value, and effort. The difference in the field of student science shows the difference in ATS, but only in the dimension of value. This study does not have enough evidence to state that there is a significant relationship between student attitudes to statistics and the results of learning statistics.
ENHANCEMENT OF STUDENTS' MATHEMATICAL COMMUNICATION UNDER METACOGNITIVE SCAFFOLDING APPROACH Sufyani Prabawanto
Jurnal Infinity Vol 8 No 2 (2019): Volume 8 Number 2, Infinity
Publisher : IKIP Siliwangi and I-MES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22460/infinity.v8i2.p117-128

Abstract

This research aims to investigate the enhancement of students’ mathematical communication under metacognitive scaffolding approach. This research used a quasi-experimental design with pretest-posttest control. The subjects were pre-service elementary school teachers in Bandung. In this study, there were two groups of subjects: experimental and control groups. The experimental group consists of 60 students under metacognitive scaffolding approach, while the control group consists of 58 students under direct approach. Based on the prior mathematical ability, the students were classified into three levels, namely high, midlle, and low. Data collection instrument used mathematical communication test. The conclusions of the research are: (1) there is a significant difference in enhancing mathematical communication ability between students who attended the course under metacognitive scaffolding approach and those under direct approach, and (2) there was no significant interaction effect between teaching approaches and ability levels based on prior knowledge in enhancing students’ mathematical communication.
STUDYING STUDENT STATISTICAL LITERACY IN STATISTICS LECTURES ON HIGHER EDUCATION USING GROUNDED THEORY APPROACH Lukman Lukman; Wahyudin Wahyudin; Didi Suryadi; Dadan Dasari; Sufyani Prabawanto
Jurnal Infinity Vol 11 No 1 (2022): VOLUME 11, NUMBER 1, INFINITY
Publisher : IKIP Siliwangi and I-MES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22460/infinity.v11i1.p163-176

Abstract

The purpose of this study was to obtain an overview of the student's Statistical Literacy model in Statistics learning in Higher Education. Researchers conducted an in-depth study of student statistical literacy, how they understand and apply statistics, how statistics are used as a tool for reliable data that can be trusted as scientific works. The research method uses qualitative research methods with a Grounded Theory approach. Participants involved in this study were 114 participants from several universities in West Java, Indonesia. The results of this study found a student statistical literacy model consisting of 2 dimensions and 5 elements. Dimensions of Statistical Knowledge: Descriptive Statistics, Inference Statistics, Statistical Communication and Statistical Reasoning. Attitude Dimensions: Confidence and Critical Attitude.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Mujib Aflich Yusnita Fitrianna Agung Wicaksono Ahmad Arifuddin Ahmad Nizar Rangkuti Ahmad Tafsir Ahmad Tafsir, Ahmad Ahmad Zulfa Khotimi Ahmad Zulfa Khotimi Ahmatika, Deti Aiyub Aiyub Alfitri, Putri Armania Agustina Alman Alman Alman Alman, Alman Amalia Indrawati G Andika Putra R Aneu Pebrianti Anwar, Agus Saeful Aridanthy, Vanya Aryanti Asep Syarif Hidayat Asfar, A.M.Irfan Taufan Asfar, Andi Muhamad Iqbal Akbar Aswin Aswin Atep Sujana Augie, Kintan Tyara Bambang Eko Susilo Bambang Hariyomurti Bariyah, Nusrotul Candra Nugraha Cece Kustiawan Cecep Anwar Hadi Firdos Santosa Cecep Anwar Santosa Christina Monika Samosir Citra Utami Dadan Dasari Dadan Hermawan, Dadan Dadang Juandi Dahlan, Jarnawi Ahmad Dallyono, Ruswan Darhim Darhim David Nurfiqih Dela Ambarwati Desi Elizanti Desy Lusiyana Dewi Nurmalitasari Dian Cahyawati Dian Nopiyani Dian Usdiyana Didi Suryadi Didi Suryadi Didi Suryadi Dinar Nur Alkifah Jihadatunnafsy Doni, Petrus Kanisius Nama Dwi Arisma Wahyudi Edi Irawan Edria Al Shahada Effy Mulyasari Ejen Jenal Mutaqin Eka Novarina Eko Yulianto EKO YULIANTO Eko Yulianto Elah Nurlaelah Elizanti, Desi Encum Sumiaty, Encum Endang Cahya Mulyaning A. Eyus Sudihartinih Fardian, Dilham Fathiyah, Ifa Fatimah Aqilah Ichtiari Fatimah, Siti Febriani, Winarti Dwi Fitri Ayu Febrianti Fitri Ayu Febrianti Fitriana Lestari Fitriani Fitriani Fujiarti, Ari Ginda M.A.Siregar Gita Rani Putri Mangiri Gumpita, Melly Terry Gunadi, Farid Hadi Haeruddin, Haeruddin Hani Nurhasanah Hayuningrat, Silfia Herizal Herizal Hutkemri Zulnaidi Iden Rainal Ihsan Ifa Fathiyah Inayah, Sarah Indiana Marethi Indiana Marethi, Indiana Indra Nurhidayat Irena Puji Luritawaty Istikomah, Endang Itoh Masitoh Izzy Balagtas Villarico Jarnawi Afgani Dahlan Jozua Sabandar Jurpri, Al Jusniani, Nia Kartika Yulianti Kholipah, Nuzuliah Khotimah, Wonadesma Dwi Khusnul Novianingsih Kintan Tyara Augie Kurniawati, Ririn Laelasari Laelasari, Laelasari Lien Malinda Lina Siti Nurwahidah Lucky Heryanti Jufri Lukman Lukman M Akbar Gulvara M Candra Nugraha Deni Mangiri, Gita Rani Putri Masitoh, Lisda Fitriana May Nisa Istiqomah Mefiana, Syifa Ananda Meicindy Jeny Klorina Meilani, Rini Melani, Rini Melati, Catur Yustika Melisa Melisa Milah Nurkamilah Mimi Hariyani Mohamad Gilar Jatisunda Muhamad Soeleman Muhamad Yasin Mustika Fauziah, Hilma Nabila Cynthia Rayhan Nanang Priatna Nandang Arif Saefuloh Nazla Nurul Aulia Panggabean Nelvita Febrina Hasan ningrum, yunia jumita Nopiyani, Dian Nopiyani, Dian Nova Nurhanifah Novi Andri Nurcahyono Novia Rahmi Noviana Antaria Nti, Seth Junior Nuaini, Intan Nuke Fitri Yanuari Nur Qamariah Nurannisa, Andi Nurdiyah Kurniati Nurhayati, Ani Permani, Kania Dewi Pertiwi, Saffanah PRASETYAWAN, ENGGAR Prihandhika, Aditya Putri, Amelia Defrianti Rachmawati Khaerun Nisa Raisya Hizkiya Syabina Ramli Ramli Rani Sugiarni Rini Sulastri Riny Arviana Ririn Kurniawati Riza Fatimah Zahrah Rizki, Raihan Ahmil Rizky Rosjanuardi Rohimah, Siti Maryam Rosmayasari Rosmayasari Rosmayasari, Rosmayasari Rostina Sundayana Rusdiono Muryanto Ruswan Dallyono Saefuloh, Nandang Arif Saefuloh, Nandang Arif Safrina Safrina Samosir, Christina Monika Sandra Sukmaning Adji Santi, Eneng Sanusi Sanusi Saputra, Samnur Sarassanti, Yumi Sarnav Ituga, Almuhaimin Sendi Ramdhani Septian, Ari Simanjuntak, Sinitta Marito Siregar, Rama Nida Sitanggang, Damra Ali Siti Fatimah Siti Zakiyah Sofa, Rostika Nurlaela Nova Maya Suhendra Suhendra Suhendra, S Sukma Murni Sukri Sukri suparni Surya, Marcia Ann Syamsuri Syamsuri Syarifah, Mufarrahatus Syarifah, Mufarrahatus Syifa Ananda Mefiana Tata Frarisia Tatang Herman, Tatang Tin Lam, Toh Trisna Nugraha Trisnowali MS, Andi Turmudi Ulfah Nur Azizah Ulfah Nur Azizah Umbara, Uba Umbara, Uba Usep Kosasih Wafa Islamiyah Wahyu Hidayat Wahyu Sopandi Wahyudi, Dwi Arisma Wahyudin Wahyudin Wahyudin Wahyudin Wahyudin Wahyudin Wahyudin Wardani, Ambarsari Kusuma Wenda Alifulloh Widdy Sukma Nugraha Yasin, Muhamad Yaya S. Kusumah Yeni Dwi Kurino Yeni dwi Kurino Yusuf Adhitya