YUSUF FUAD

Spatial Thinking in Conic Sections: A Study of Undergraduate Mathematics Students by Sex and Spatial Category

Mathematics Education Journal 19 (2), 275-298, 2025

2025

Analysis of error in mathematical modeling problems: An exploratory study of middle school students

Edelweiss Applied Science and Technology 9 (7), 947-959, 2025

2025

The influence of students' working memory capacity on solving calculus problems

Edelweiss Applied Science and Technology 9 (7), 518-528, 2025

2025

Content knowledge of undergraduate students in solving the algebra’s problem

Edelweiss Applied Science and Technology 9 (7), 580-594, 2025

2025

Penguatan Penyusunan Soal Tugas Berorientasi Pemodelan Matematika Dan Literasi Numerasi Bagi Guru-Guru Sd Di Kabupaten Pasuruan

Jurnal Pengabdian Masyarakat Progresif Humanis Brainstorming 8 (1), 233-242, 2025

2025

Penerapan Kontrol Proporsional-Integral-Derivatif pada Analisis Kedalaman Kapal Selam Jenis AUV

MATHunesa: Jurnal Ilmiah Matematika 13 (1), 1-12

2025

The Influence of Students' Commognition in Solving Integral Problems

Conference Proceedings of International Conference on Teaching, Education …

2024

Students Self-Efficacy in Solving Geometric Problems: Case Study in Private Junior High School in Malang City.

Library of Progress-Library Science, Information Technology & Computer 44 (3 …, 2024

2024

Effectiveness of the Problem Based Learning Model to Improve Self-Regulation and Geometry Problem-solving Abilities of Junior High School Students

European Journal of Mathematics and Science Education 5 (3), 135-145, 2024

2024

From concept to assessment: Developing a GeoGebra assisted mathematics test to measure semiotic-spatial thinking using abstraction in context framework

Proceedings of the 2024 8th International Conference on Education and …, 2024

2024

Statistical Literacy of Senior High School Students in Problem-Solving with AKM Model Data Content and Uncertainty in Terms of Mathematical Ability

Journal of Medives: Journal of Mathematics Education IKIP Veteran Semarang 8 …, 2024

2024

Examining undergraduate students' abstraction of conic sections in a dynamic geometry environment

Journal on Mathematics Education 15 (3), 717-734, 2024

2024

Proses Pemecahan Masalah Matematika High Order Thinking Skills Siswa SMA Materi Trigonometri

EDUKASIA Jurnal Pendidikan dan Pembelajaran 5 (1), 1361-1370, 2024

2024

Pemodelan Koinfeksi HIV/HTLV-1 Dengan Spesifik Antibodi HIV

MathUnesa Jurnal Ilmiah Matematika 12 (3), 600-614

2024

Analisis Pelaksanaan Pelatihan Penulisan Karya Tulis Ilmiah di MGMP Matematika SMP Kabupaten Lumajang

Aksiologiya: Jurnal Pengabdian Kepada Masyarakat 8 (2), 296–302-296–302, 2024

2024

Handling Overdispersion Problems in Multinomial Logistic Regression (Study Case in Stress Level Data)

PROOF 3, 78-83, 2023

2023

Comparative Analysis of Students' Argumentation Patterns in the Context of Algebraic Problems.

Mathematics Teaching Research Journal 15 (5), 105-128, 2023

2023

Berpikir Kritis dan Pemecahan Masalah Matematika

2023

The Effect of Probabilistic Thinking on the Ability of Undergraduate Students of Mathematics Education in Solving Binomial Distribution Problems

International Journal of Humanities Education and Social Sciences 2 (4), 2023

2023

Analisis kestabilan dan penerapan kontrol optimal pada model penyebaran rumor melalui liputan media

MATHunesa: Jurnal Ilmiah Matematika 11 (1), 35-48

2023

Model Dinamik SEARQ dan Penerapan Kontrol Optimal pada Permasalahan Kecanduan Media Sosial

MATHunesa: Jurnal Ilmiah Matematika 11 (1), 67-81

2023

Bibliometrics analysis of research on argumentation in mathematics education

International Journal of Education in Mathematics, Science and Technology 11 …, 2023

2023

Developing and Reporting Psychometric Evidence of Prerequisite Algebra Skills Instrument

Acta Scientiae 25 (4), 133-162, 2023

2023

Berpikir Komputasional Siswa Smp Dalam Menyelesaikan Masalah Matematika

EduMatSains: Jurnal Pendidikan, Matematika dan Sains, 104-113

2023

Pemberian Scaffolding Kepada Siswa SMP dalam Menyelesaikan Soal Pisa Konten Change and Relationship

EDUKASIA Jurnal Pendidikan dan Pembelajaran 4 (2), 1631-1638

2023

The Development of the Validated Instruments to Assess the Ability of the 9th Graders in Solving Diagnostic Geometry Problem in Two Characteristic Classes

International Joint Conference on Arts and Humanities 2023 (IJCAH 2023 …, 2023

2023

Analisis kreativitas siswa terhadap kemampuan siswa dalam menyelesaikan soal tipe HOTS

Journal Focus Action of Research Mathematic (Factor M) 6 (2), 59-72, 2023

2023

Error and Mathematics Anxiety Analysis of Junior High School Students in Completing Diagnostic Tests

Kreano, Jurnal Matematika Kreatif-Inovatif 14 (1), 202-215, 2023

2023

Development of Student Worksheets Based on REACT on Quadrilateral Material

MATHEdunesa Journal of Education Mathematics 11 (2022), 668-676, 2022

2022

Hots Solving Mathematical Category Problems

Budapest International Research and Critics Institute-Journal (BIRCI-Journal ..., 2022

2022

HEURISTIK SISWA PEREMPUAN SMP DALAM MEMECAHKAN MASALAH POLA BILANGAN

JPMI (Jurnal Pembelajaran Matematika Inovatif) 5 (3), 625-638, 2022

2022

The Influence of Intelligence Level on Mathematic Communication of Junior High School Students in Solving Hots Category Questions

Budapest International Research and Critics Institute-Journal (BIRCI-Journal …, 2022

2022

Kinematika Performa 100 meter Sprinter Elit Indonesia

Jurnal Ilmu Keolahragaan Undiksha 10 (3), 223-230, 2022

2022

Argumentation in K-12 Mathematics and Science Education: A Content Analysis of Articles.

International Journal of Research in Education and Science 7 (1), 51-64, 2021

2021

Teacher's Specialized Content Knowledge on the Concept of Square: A Vignette Approach

Jurnal Pendidikan Matematika 15 (1), 1-22, 2021

2021

Pelatihan Penggunaan Software jBatik kepada Guru-guru MGMP Seni Budaya SMP Kabupaten Tulungagung

Abimanyu: Journal of Community Engagement 2 (2), 43-48, 2021

2021

Penerapan Model SEQIR dengan Kontrol Optimal pada Dinamik Pandemi Covid-19

MATHunesa: Jurnal Ilmiah Matematika 9 (2), 366-379, 2021

2021

The Effect of Immunotherapy Treatment on Leukaemia Growth Dynamic Model

International Joint Conference on Science and Engineering 2021 (IJCSE 2021 …, 2021

2021

Pemberdayaan Guru Matematika SMP Dalam Mengembangkan Numerasi Siswa Konteks Pandemi Covid-19

Transformasi: Jurnal Pendidikan Matematika dan Matematika 5 (2), 647-657, 2021

2021

Paradoks: filsafati pendidikan matematika

Unesa University Press, 2021

2021

Argumentation in K-12 Mathematics and Science Education: A Content Analysis of

2020

Students’ Understanding of Negatif Integers and Its Operations Based on Pseudo-Scaffolding

2020

The Prototypes of Mathematical Knowledge for Teaching Based on Teacher’ s Conceptual on Quadrilateral

2020

KONSEPSI SEGITIGA BOLA DITINJAU DARI GAYA BELAJAR (CONCEPTION OF SPHERICAL TRIANGLE IN TERMS OF LEARNING STYLES)

STKIP PGRI Banjarmasin, 2020

2020

Conception of spherical triangle in terms of learning styles

Math Didactic: Jurnal Pendidikan Matematika 6 (1), 1-11, 2020

2020

Smart Learning Models to support Online Learning during the Covid-19 Physical Distancing period for Junior High School Mathematics Teachers in Teachers Professional Development …

International Conference on Research and Academic Community Services …, 2020

2020

Profil Berpikir Aljabar Siswa SMP Dalam Menyelesaikan Masalah Pola Bilangan

Kreano, Jurnal Matematika Kreatif-Inovatif 11 (1), 56-63, 2020

2020

Investigating Covariational Reasoning: What Do Students Show when Solving Mathematical Problems?

2020

The ability of multi-representation of junior high school students in solving algebra problem in the TIMSS model

Journal of Physics: Conference Series 1470 (1), 012040, 2020

2020

Dynamism of Open-Ended Problem Solving: Study on Junior High School Students Behavior Based on Keirsey Personality Type

International Conference on Science, Technology, Education, Arts, Culture …, 2019

2019

Analysis of Student Errors in Completing PISA Content Space and Shape Problems Viewed from Vak Learning Style

Jurnal Ilmiah Pendidikan Matematika Volume 8 (3), 2019

2019

DEVELOPMENT OF STUDENTS'UNDERSTANDING OF EXPONENTIAL BASED ON COGNITIVE STYLE

JURNAL PENELITIAN PENDIDIKAN MATEMATIKA DAN SAINS 3 (1), 10-20, 2019

2019

Analysis of Biomechanics Slap Hit and Push in The Field Hockey

2nd International Conference on Sports Sciences and Health 2018 (2nd ICSSH …, 2019

2019

What Construct of Mathematical Knowledge for Teaching do Mathematics Teachers Need?(A Theoretical Framework and Conceptualization in Geometry)

1st International Conference on Advanced Multidisciplinary Research (ICAMR …, 2019

2019

Keefektifan Problem Based Learning pada Materi Aritmetika Sosial Kelas VII SMP

Kreano, Jurnal Matematika Kreatif-Inovatif 10 (1), 10-17

2019

Kemampuan Representasi Mahasiswa Pendidikan Matematika dalam Menyelesaikan Soal Kalkulus

Kreano, Jurnal Matematika Kreatif-Inovatif 10 (1), 27-36, 2019

2019

Development of braille number card as learning media on integer materials for blind students

International Journal for Educational and Vocational Studies 1 (4), 268-272

2019

The Fraction Magnitude Knowledge through Students Representation with Mathematics Difficulties

MISEIC 2019, 2019

2019

The fraction magnitude knowledge through representations at students with mathematics difficulties

Mathematics, Informatics, Science, and Education International Conference ..., 2019

2019

Students’ Proof Scheme for Mathematical Proving and Disproving of Divisibility Proposition

Mathematics, Informatics, Science, and Education International Conference …, 2019

2019

Algebraic reasoning of students with logical-mathematical intelligence and visual-spatial intelligence in solving algebraic problems

International Journal of Trends in Mathematics Education Research 2 (4), 207-211, 2019

2019

Two-Level Handling Model of Tuberculosis

Journal of Physics: Conference Series 1417 (1), 012021, 2019

2019

Students’ Problem Solving Behavior On Multiplicative Word Problem

Journal of Physics: Conference Series 1417 (1), 012046, 2019

2019

Developing Vignettes to Assess Mathematical Knowledge for Teaching Based Conceptual.

International Journal of Instruction 12 (3), 651-664, 2019

2019

Students’ concept formation stages in solving geometry problem based on personality types

Journal of Physics: Conference Series 1211 (1), 012093, 2019

2019

Teachers content knowledge in generalizing mind maps of quadrilateral

Journal of Physics: Conference Series 1157 (4), 042091, 2019

2019

Student’s Multiple Representation in Solving Addition and Subtraction of Fraction Problem

Journal of Physics: Conference Series 1417 (1), 012050, 2019

2019

Specialized Content Knowledge based Conceptual Calon Guru Matematika Terhadap Materi Segiempat

Prosiding Seminar Nasional Pendidikan Matematika Universitas Halu Oleo 1 (1 ..., 2018

2018

Derivatif Fraksional Caputo-ortiguera Fungsi Hurwitz Sertaperilakunya pada Bidang Gaussian

Mathunesa: Jurnal Ilmiah Matematika 1 (7), 2018

2018

Error analysis of Indonesian junior high school student in solving space and shape content PISA problem using Newman procedure

Journal of Physics: Conference Series 947 (1), 012053, 2018

2018

Pengaruh Latihan Plyometric Front Cone Hops dan Counter Movement Jump Terhadap Power dan Kekuatan Otot Tungkai

Jurnal SPORTIF: Jurnal Penelitian Pembelajaran 4 (1), 105, 2018

2018

STUDENTS’DIFFICULTIES IN SOLVING RATIO PROBLEM

MATHEdunesa 7 (2), 143-149, 2018

2018

Penerapan Model Goal Programming dalam Penyusunan Rencana Bisnis Anggaran (Studi Kasus pada Pemerintah Kabupaten Lamongan)

Mathunesa: Jurnal Ilmiah Matematika 6 (2), 2018

2018

Effect of Plyometric Front Cone Hops Training and Counter Movement Jump Training to Power and Strenght of Leg Muscles

Jurnal SPORTIF: Jurnal Penelitian Pembelajaran 4 (1), 105-119, 2018

2018

Penyebaran Citrus Tristeza Virus pada Tanaman Jeruk dengan Waktu Tundaan

Mathunesa: Jurnal Ilmiah Matematika 6 (2), 2018

2018

Justification Strategies of The 7th Grade Students in Understanding Triangles’ Concepts

Mathematics, Informatics, Science, and Education International Conference …, 2018

2018

Students’ Proof Schemes for Disproving Mathematical Proposition

Mathematics, Informatics, Science, and Education International Conference …, 2018

2018

Students' Reasoning Behavior on Generalization of Figural Pattern

Mathematics, Informatics, Science, and Education International Conference …, 2018

2018

STUDENTS’HIGHER-ORDER THINKING SKILLS IN SOLVING GEOMETRY PROBLEM BASED ON ADVERSITY QUOTIENT

MATHEdunesa 7 (2), 225-231, 2018

2018

Penerapan Kontrol Proporsional Derivatif Dan Target Tracking Pada Kestabilan Drone Tipe 2.0

Mathunesa: Jurnal Ilmiah Matematika 6 (2), 2018

2018

Students’ s Strategies in Proof by Contradiction, Counter-example and Contrapositive in Terms of Mathematics Ability

MISEIC 2018, 2018

2018

The Propagation of Citrus Tristeza Virus on Citrus Plant with Delays

MISEIC 2018, 2018

2018

CAPUTO-ORTIGUERA FRACTIONAL DERIVATIVE OF ζ-HURWITZ FUNCTION AND BEHAVIOR IN GAUSSIAN PLANE

MISEIC 2018, 2018

2018

Development of Interactive Audio Learning Media to Enhance Student's Understanding at Interger Lesson

MISEIC 2018, 2018

2018

Penyebaran Virus Ebola Dengan Kombinasi Transmisi Seksual dan Non-Seksual

Mathunesa: Jurnal Ilmiah Matematika 6 (2), 2018

2018

Implementation of Lesson Study in Mathematics Learning Based on Student Cognitive Style

Prosiding Atlantis Press, ISSN: 2352-5401, ISBN: 978-94-6252-593-1, doi: 10 ..., 2018

2018

Pelatihan Pemanfaatan Google Apps for Education Bagi Guru-Guru di MGMP Matematika SMA Kabupaten dan Kota Kediri

Prosiding Semnas PPM 2018 1 (1), 1390-1396, 2018

2018

Fraction Magnitude Knowledge: Students Strategy in Estimating Fractions

Journal of Physics: Conference Series

2018

The Control Design for Trajectory Tracking of Four-wheeled Mobile Robot using Model Predictive Control: A Preliminary Study

International Conference on Science and Technology (ICST 2018), 508-511, 2018

2018

Students’ critical-metacognition activity based on their personality type

International Conference on Mathematics and Science Education of Universitas ..., 2018

2018

Students’ representation in mathematical word problem-solving: exploring students’ self-efficacy

Journal of Physics: Conference Series 947 (1), 012059, 2018

2018

Students’ covariational reasoning in solving integrals’ problems

Journal of Physics: Conference Series 947 (1), 012017, 2018

2018

Student’s Critical Thinking in Solving Open-Ended Problems Based on Their Personality Type

Journal of Physics: Conference Series 947 (1), 012007, 2018

2018

Reasoning Behaviors of Mathematics Difficulties Students in Solving Multiplication Integers

Mathematics, Informatics, Science, and Education International Conference …, 2018

2018

Problem Solving Behaviors of Grade Seven Students Focusing on Negative Integers

Mathematics, Informatics, Science, and Education International Conference …, 2018

2018

Elementary Students’ Strategy in Solving Place Value of Number Problems

MISEIC 2018, 2018

2018

Students’ Covariational Reasoning in Fraction Compare Problem

Journal of Physics: Conference Series 1108 (1), 012108, 2018

2018

A Note On The Weighted Fourier Transforms on p–Integrable Function Spaces

Journal of Physics: Conference Series 1108 (1), 012103, 2018

2018

The Way of Students’ Reasoning of Elementary Students in Solving Integer Problem

Journal of Physics: Conference Series 1108 (1), 012033, 2018

2018

Delay’s propagation of citrus tristeza virus on citrus plant

Journal of Physics: Conference Series 1108 (1), 012086, 2018

2018

TINDAK PIDANA PEMBUNUHAN YANG DISELESAIKAN SECARA ADAT YANG TIDAK SESUAI DENGAN PERUNDANG-UNDANGAN (KUHP DAN KUHAP)(Study kasus Desa Ture dan Desa Lubuk Ruso Kecamatan Pemayung di Kabupaten Batang Hari)

Jurnal Ilmiah Universitas Batanghari Jambi 9 (2), 34-46

2017

ANALISIS KESTABILAN GERAK DIAGONAL PADA QUADROTOR MENGGUNAKANKONTROL PID

MATHunesa 3 (6)

2017

Analisis Kesalahan Siswa dalam Menyelesaikan Soal PISA

Jurnal Ilmiah Pendidikan Matematika 1 (6), 24-31, 2017

2017

Stabilitas Sistem Dinamik Pertumbuhan Sel Kanker dengan Terapi Radiasi

Jurnal Ilmiah Matematika Volume 3 (6), 2017

2017

ANALISIS KESTABILAN GERAK DIAGONAL PADA QUADROTOR MENGGUNAKAN KONTROL PID Salmaa

Jurnal Ilmiah Matematika Volume 3 (6)

2017

Kontrol Proporsional-derivatif Pada Sistem Dinamikpesawat Terbang Tipe Airbus A380-800

Mathunesa: Jurnal Ilmiah Matematika 5 (3), 2017

2017

Students’ Representation in Mathematics Word Problem Solving: Exploring Self-efficacy

MISEIC 2017, 2017

2017

The Analysis of Junior High School Students Error in Solving Space and Shape Content PISA Problems Using Newman Procedure

MISEIC 2017, 2017

2017

Translation between mathematical representation: exploring gender differences

MISEIC 2017, 2017

2017

Student Metacognitive Activities in Geometry Problem Solving Research from Personality Type

MISEIC 2017, 2017

2017

Analisis kestabilan sistem dinamik underdamped pada tabrakan kendaraan

Mathunesa: Jurnal Ilmiah Matematika 3 (6), 2017

2017

Analisis kestabilan sistem dinamik satelit pengamat bumi

Mathunesa: Jurnal Ilmiah Matematika 5 (3), 2017

2017

PROFILE OF MATHEMATICS ACHIEVEMENT OF EIGHTH-GRADE STUDENTS BASED ON ISLAMIC SPIRITUAL INTELLIGENCE

MATHEdunesa 6 (3), 2017

2017

Profil Penalaran Proporsional Siswa SMP dalam Memecahkan Masalah Matematika Berdasarkan Gaya Kognitif Sistematis dan Intuitif

Kreano, Jurnal Matematika Kreatif-Inovatif 8 (2), 162-170, 2017

2017

Students’ Covariational Reasoning in Solving Problems about Integrals

MISEIC 2017, 2017

2017

Profile of Junior High School Student’ s Critical Thinking in Solving Open-Ended Problems Based on the Personality Type

MISEIC 2017, 2017

2017

Analisis Kesalahan Siswa SMP dalam Menyelesaikan Soal Aljabar Model TIMSS

MATHEdunesa 3 (5)

2016

Identifikasi Suara Konsonan Ledak Bilabial dengan Analisis Nilai Eigen

Mathunesa: Jurnal Ilmiah Matematika 3 (1)

2014

Prediagnosis Penyakit Hipertensi Menggunakan Jaringan Syaraf Tiruan Backpropagation

Mathunesa: Jurnal Ilmiah Matematika 3 (2)

2014

Analisis Stabilitas Model Sel Imun-Tumor dengan Tundaan Waktu

MATHunesa: Jurnal Ilmiah Matematika 3 (2), 2014

2014

STUDY KASUS PEMBUNUHAN YANG DISELESAIKAN SECARA ADAT DI KABUPATEN BATANG HARI

Jurnal Ilmiah Universitas Batanghari Jambi Vol 9 (1)

2009

Pembelajaran Terintegrasi Pada Perkuliahan Metode Numerik I: Upaya Peningkatan Kualitas Struktur Logik Mahasiswa Dalam Penyelesaian Masalah Secara Num...

Seminar Nasional Penelitian, Pendidikan & Penerapan MIPA 2005

2005

Pembelajaran Terintegrasi Pada Perkuliahan Metode Numerik I: Upaya Peningkatan Kualitas Struktur Logik Mahasiswa Dalam Penyelesaian Masalah Secara Numerik

Seminar Nasional Penelitian, Pendidikan & Penerapan MIPA 2005, 2005

2005

On the Stability of the Pulsewidth-Modulated ?uk Converter

IEEE Transactions on Circuits and Systems II: Express Briefs

2004

On the stability of the pulsewidth-modulated C/spl acute/uk converter

IEEE Transactions on Circuits and Systems II: Express Briefs 51 (8), 412-420, 2004

2004

Stability aspects of a multifrequency model of a PWM converter

International Journal of Control 76 (3), 309-317, 2003

2003

On multifrequency modelling and control of PWM DC-DC converters

2003

Buku Petunjuk Sapi Perah di Indonesia: Kesehatan Pemerahan

Dairy Technology Improvement Project in Indonesia, Bandung, 2002

2002

Kesehatan Pemerahan

Dairy Technology Improvement Project in

2002

A Linear Controller for a Multifrequency Model of a Pulse-Width-ModulatedCuk Converter

Proceedings of the Fifteenth International Symposium on Mathematical Theory ..., 2002

2002

Control-On the Periodic Behavior of PWM DC-DC Converters

IEEE Transactions on Power Electronics 17 (4), 585-595, 2002

2002

On LQG controller design for a multifrequency model of pulse-width-modulated DC-DC converters based on output feedback in the presence of noise disturbances

ISSM 2002 Proceedings ISSM 2002 Empowerment of Indonesian Small and Medium ..., 2002

2002

On the periodic behavior of PWM DC-DC converters

IEEE Transactions on Power Electronics 17 (4), 585-595, 2002

2002

Discrete-time modeling and analysis of pulse-width-modulated switched power converters

Electronic Proceedings of 15th International Symposium on the Mathematical ..., 2002

2002

Pulse-width modulated dc-dc converters

International Journal of Electrical Engineering Education

2001

Basic properties of a multifrequency model of pulse-width-modulated DC-DC converters

International Symposium on Signals, Circuits and Systems, Iasi, Romania, 313-316, 2001

2001

Reachability of continuous time model of pulse-width-modulated dc-dc converters

Pubscieaeif 1 (1), 59-62, 2001

2001

Study of multifrequency modeling of PWM DC-DC converters

6th Indonesian Student's Scientific Meeting, Manchester, UK, 391-394, 2001

2001

Inverse Problems in Optimal Control with Emphasis on Dynamical Systems in Human Movement

School of Mathematics and Statistics, Curtin University of Technology, 1990

1990

PENERAPAN MODEL SEQIR DENGAN KONTROL OPTIMAL PADA SISTEM DINAMIK PANDEMI COVID-19

ANALISIS KESALAHAN SISWA DALAM MENYELESAIKAN SSOAL PISA

OPTIMALISASI PRODUKSI PADA INDUSTRI PEMBUATAN KEMASAN GELAS DENGAN METODE GOAL PROGRAMMING (STUDI KASUS PADA PT. IGLAS) Ariyati

PREDIAGNOSIS PENYAKIT HIPERTENSI MENGGUNAKAN JARINGAN SYARAF TIRUAN BACKPROPAGATION Shabrina Al Alifah

MODEL DINAMIK PERTUMBUHAN LEUKEMIA DENGAN PENGOBATAN IMUNOTERAPI

PENERAPAN MODEL SEIPAHRF PADA DINAMIK PENULARAN COVID-19: STUDI KASUS DI JAWA TIMUR