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Simarmata, Justin Eduardo

Pendidikan Matematika, Fakultas Keguruan Dan Ilmu Pendidikan, Universitas Timor, Indonesia

Author-ID : 1527235

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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Implementation of K-Means Clustering to Human Development Indicators in East Nusa Tenggara Simarmata, Justin Eduardo; Chrisinta, Debora; Purnomo, Miko
Journal of Research in Mathematics Trends and Technology Vol. 6 No. 2 (2024): Journal of Research in Mathematics Trends and Technology (JoRMTT)
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jormtt.v6i2.17066

K-Means has been adopted to group various cases related to the quality of humanresources and economic growth. This study aims to apply K-Means to thecharacteristics based on selected Human Development Index (HDI) indicators,namely the average length of schooling, the expectation of length of schooling andlife expectancy in Province of East Nusa Tenggara. The optimal cluster obtainedis 6 clusters. The cluster with the highest average value of all variables is in cluster1 which is Kupang City area. Meanwhile, condition cluster 6 provides the smallestlife expectancy value compared to other clusters. The smallest average variable ofschool length is in cluster 2. The regions that provide the smallest numberexpectation of length of schooling is in cluster 5.

Implementation of RShiny in Developing Interactive Learning Media for Analysis of Variance (ANOVA) Simarmata, Justin Eduardo; Chrisinta, Debora; Purnomo, Miko
Journal of Research in Mathematics Trends and Technology Vol. 7 No. 1 (2025): Journal of Research in Mathematics Trends and Technology (JoRMTT)
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jormtt.v7i1.20167

Effective learning is significantly influenced by the methods and media used in the teaching and learning process. However, many students still struggle to understand mathematical concepts due to the limited availability of interactive learning media. Therefore, this study aims to develop and evaluate the effectiveness of a technology-based interactive learning application designed to enhance students' understanding. The development of this application follows several stages, including needs analysis, design, implementation, testing, and evaluation. The application offers various features, such as interactive materials, practice exercises, and visual simulations, to facilitate better comprehension of concepts. The data used in this study consists of pretest and posttest results from 30 students who were given a series of basic questions, including calculating the mean, standard deviation, and performing simple statistical tests. Analysis using the Paired t-Test indicates a significant increase in posttest scores compared to pretest scores (p-value = 3.522e-08). Data visualization in the form of boxplots and line charts also demonstrates a trend of improved student performance after using the application. Thus, this study confirms that the developed interactive application is effective in enhancing student learning outcomes.

OPTIMASI JARAK TERPENDEK UNTUK MENCAPAI WISATA SUPER PRIORITAS INDONESIA DENGAN MENGGUNAKAN PENDEKATAN TRAVELING SALESMAN PROBLEM Purnomo, Miko; Simarmata, Justin Eduardo; Chrisinta, Debora
MathVisioN Vol 7 No 1 (2025): Maret 2025
Publisher : Prodi Matematika FMIPA Unirow Tuban

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55719/mv.v7i1.1478

Sektor pariwisata sekarang ini menjadi salah satu hal yang sedang ditingkatkan oleh pemerintah Indonesia. Berbagai upaya telah dilakukan oleh pemerintah untuk meningkatkan persentasi pada sektor tersebut. Salah satu upaya pemerintah dalam meningkatkannya adalah dengan menjadikan beberapa destinasi di Indonesia menjadi Bali baru yang diharapkan bisa memberikan dampak pada pertumbuhan jumlah wisatawan. Untuk itu pemerintah menjadikan lima daerah di Indonesia sebagai wisata super prioritas yang diharapakan mampu meningkatkan sektor pariwisata di Indonesia. Kelima daerah tersebut adalah Danau Toba, Borobudur, Mandalika, Labuan Bajo dan Likupang. Dengan wilayah Indonesia yang sangat luas, tentu optimisasi jarak akan menjadi pertimbangan bagi para wisatawan. Selain jarak yang pendek, tentu akan berimbas pada waktu dan biaya yang akan dihabiskan untuk mencapai kelima wisata super prioritas ini. Pendekatan Matematis dengan Traveling Salesman Problem diharapkan mampu memecahkan solusi untuk mendapatkan rute optimal dalam penelitian ini. Dengan menggunakan aplikasi Solver yang terdapat pada fitur add-in pada Microsoft Excel dan Phyton telah mendapatkan rute optimal. Dengan titik keberangkatan awal adalah Jakarta sebagai provisi yang terletaknya Bandara Internasional Soekarno Hatta. Semulanya jarak total yang ditempuh adalah 11.848 km sampai kembali ke Jakarta, menjadi 10.823 km dengan rutenya adalah Jakarta – Danau Toba- Borobudur – Mandalika -Labuan Bajo – Likupang -Jakarta. Dengan jarak terpendek yang didapatkan, maka rute ini bisa menjadi pilihan untuk mencapai seluruh wisata super prioritas secara optimal.

Analisis Kesalahan Siswa Menggunakan Tahapan Kastolan Dalam Menyelesaikan Soal Cerita Patrisius Bauk; Oktovianus Mamoh; Justin Eduardo Simarmata
RANGE: Jurnal Pendidikan Matematika Vol. 4 No. 1 (2022): RANGE Juli 2022
Publisher : Pendidikan Matematika UNIMOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jpm.v4i1.2478

The purpose of this research was to determine the types and factors of errors made by grade VII students of SMP St. Yosef Maubesi in solving story problems on the subject of operations in algebraic forms. The research method used is descriptive qualitative. The research subjects were students of class VII SMP St. Yosef Maubesi. Data collection techniques used are tests, interviews, and documentation. The instruments in this research were the researcher, the test sheet, and the interview guide. Based on the results, it was found that conceptual errors were made by subjects 1, 2, and 3 on the questions being worked on. The cause of the subject making mistakes is that students do not understand the meaning of the question and students do not know the formula used. Procedural errors were made by subjects 1, 2, and 3 on the questions being worked on. The cause of the subject making mistakes is that students are not careful in the work process and technical errors are made by subjects 1, 2, and 3 on the questions being worked on. The causes of the subject making mistakes are: students are in a hurry to write the ending and do not understand the calculation process and students do not re-check the results of their work.

Designing Student Worksheets (LKM) Based on the Rigorous Teaching and Learning (RTL) Model Ade Mirza; Revi Lestari Pasaribu; Justin Eduardo Simarmata
RANGE: Jurnal Pendidikan Matematika Vol. 6 No. 1 (2024): Range Juli 2024
Publisher : Pendidikan Matematika UNIMOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jpm.v6i1.5624

This research aims to design Student Worksheets (LKM) for the Discrete Mathematics course, where the LKM design is structured so that the LKM can be used in the Rigorous Teaching and Learning (RTL) learning model. The results of the lecturers' reflections found that the main problem lies in the content of the material in textbooks which is not interesting, students are often unable to understand the textbooks they own, especially in solving the questions given. This has implications for 1) lack of motivation to learn, 2) lack of understanding of the material, 3) fear of expressing opinions, and 4) lectures are less effective and less enjoyable. Therefore, teaching materials need to be packaged appropriately according to the substance and conditions of students in LKM. The research design used in this research is Thiagarajan's 4-D development model. This model is a system of educational development approaches that are carried out in 4 sessions, namely Define or Introduction where in this session preliminary analysis, student analysis, and needs analysis are carried out, Design or Planning where in this session what is done is format selection, initial design and design preparation, Develop or Development where in this session validation and limited trials are carried out, as well as Disseminate or Disseminate where in this session the LKM is given to the teaching lecturers. This research produces an LKM that is used in Discrete Mathematics courses.

The Effect of Improving Human Resources for Student Interest in Selecting University on Food Security and Health: Structural Equation Modeling (SEM) Justin Eduardo Simarmata; Ferdinandus Mone; Debora Chrisinta; Winda Ade Fitriya B
RANGE: Jurnal Pendidikan Matematika Vol. 6 No. 1 (2024): Range Juli 2024
Publisher : Pendidikan Matematika UNIMOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jpm.v6i1.6308

The selection of State Universities by students has a significant impact on improving the quality of human resources, so it can also affect the improvement of food security and health. This study aims to understand the extent of students' interest in selecting university which contributes to improving human resources and can indirectly affect food security and health. This study uses the Structural Equation Modeling (SEM) method to analyze the interaction between latent variables. Data was collected through questionnaires from high school students on the Indonesia-Timor Leste border. The data used in this study include students' interest in selecting university (Y), education and knowledge (X1), skills and abilities (X2), food security (X3), and health (X4). The results showed that students' interest in selecting university had a significant correlation with improving human resources through education by 90% (X1) and 84% (X2). The impact of this increase in human resources is also seen in the improvement of food security and public health which provides a correlation of 98% (X3) and 81% (X4).

PENGEMBANGAN MEDIA PEMBELAJARAN BERBASIS GEOGEBRA UNTUK MENINGKATKAN KEMAMPUAN MENGKONSTRUKSI BUKTI MATERI LIMIT FUNGSI Ferdinandus Mone; Justin Eduardo Simarmata; Selestina Nahak
AKSIOMA: Jurnal Program Studi Pendidikan Matematika Vol 14, No 1 (2025)
Publisher : UNIVERSITAS MUHAMMADIYAH METRO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/ajpm.v14i1.10990

Definisi limit fungsi menggunakan dan yang bersifat abstrak sangat sulit dipahami oleh mahasiswa yang baru pertama kali berusaha untuk memahaminya. Definisi ini dipakai dalam pembuktian limit untuk menghilangkan bias subjektifitas dari definisi limit secara intuitif. Kesulitan memahami konsep yang tepat mengenai limit berdampak pada rendahnya kemampuan mahasiswa mengkonstruksi bukti. Penelitian ini bertujuan untuk mengembangkan media pembelajaran berbasis GeoGebra pada materi limit fungsi yang memenuhi kriteria valid, praktis, dan efektif dalam meningkatkan kemampuan mahasiswa dalam menyusun pembuktian. Jenis penelitian yang digunakan adalah Research & Development (R&D) dengan menerapkan model pengembangan ADDIE, yang terdiri dari tahap Analisis, Desain, Pengembangan, Implementasi, dan Evaluasi. Penelitian ini dilaksanakan pada semester genap tahun akademik 2023-2024 dengan partisipan mahasiswa program studi Pendidikan Matematika Universitas Timor yang mengikuti mata kuliah Kalkulus. Instrumen yang digunakan dalam penelitian ini meliputi lembar validasi ahli, angket respons mahasiswa, serta tes untuk mengukur kemampuan mahasiswa dalam menyusun pembuktian pada materi limit fungsi. Hasil penelitian menunjukkan bahwa media pembelajaran yang dikembangkan telah terbukti valid, praktis, dan efektif dalam meningkatkan keterampilan mahasiswa dalam mengonstruksi bukti pada materi limit fungsi. Media pembelajaran berbasis GeoGebra ini siap untuk diterapkan dalam proses pembelajaran Kalkulus dan Analisis Real.

IMPLEMENTASI ALGORITMA CLUSTERING UNTUK PENGELOMPOKAN MAHASISWA BERDASARKAN RESPON TERHADAP METODE PEMBELAJARAN BAHASA INGGRIS KOMPUTER Simarmata, Justin Eduardo; Aprianti, Iis; Chrisinta , Debora; Purnomo, Miko
IC Tech: Majalah Ilmiah Vol 20 No 1 (2025): IC Tech: Majalah Ilmiah Volume XX No. 1 April 2025
Publisher : P3M Institut Widya Pratama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47775/ictech.v20i1.332

Permasalahan yang dihadapi dalam proses pembelajaran Bahasa Inggris adalah rendahnya minat dan motivasi belajar mahasiswa yang dipengaruhi oleh persepsi mahasiswa terhadap metode pembelajaran yang digunakan, khususnya media video. Perbedaan persepsi ini dapat menyebabkan ketidakefektifan dalam penyampaian materi serta pencapaian hasil belajar yang tidak merata. Penelitian ini bertujuan untuk mengelompokkan mahasiswa berdasarkan respon mahasiswa terhadap media video dalam pembelajaran Bahasa Inggris, sehingga dapat diketahui karakteristik masing-masing kelompok dan strategi pembelajaran yang sesuai. Metode yang digunakan adalah analisis klaster dengan pendekatan Hierarchical Agglomerative Clustering menggunakan metode Ward. Data diperoleh dari kuesioner yang mencakup enam variabel, kemudian dilakukan pra-pemrosesan meliputi pembersihan data dan transformasi data kategorik menjadi numerik. Hasil analisis menunjukkan terbentuknya tiga klaster mahasiswa dengan distribusi yang relatif merata, di mana setiap klaster memiliki karakteristik persepsi dan motivasi belajar yang berbeda. Klaster pertama didominasi oleh sikap netral, klaster kedua menunjukkan respon positif terhadap video pembelajaran, dan klaster ketiga memperlihatkan preferensi terhadap video dengan konten percakapan. Hasil penelitian menunjukkan bahwa pengajar dapat menyesuaikan strategi dan konten pembelajaran dengan karakteristik masing-masing kelompok untuk meningkatkan efektivitas dan keterlibatan mahasiswa.

Ability to Construct Geogebra-Assisted Proofs in View of Gender Differences Mone, Ferdinandus; Simarmata, Justin Eduardo; Nahak, Selestina
Jurnal Riset Pendidikan Matematika Vol. 12 No. 1 (2025): May 2025
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jrpm.v12i1.83952

The ability of Mathematics Education students at Unimor to prove mathematical statements is relatively low. The ability to construct proofs in learning the concept of function limits is very important for advanced calculus material. The purpose of this study is to analyze the ability of male and female students in constructing proofs after being taught using GeoGebra as a learning medium. The research findings show that female students have superior proof construction abilities compared to male students. Female students excel in organizing facts, manipulating facts, and sequencing proof steps.

Review of Pedagogical Knowledge Through the Use of GeoGebra for Junior High School Students in Improving Learning Outcomes on Straight Line Equation Material Nifu, Martha Marsela; Hijriani, Lailin; Simarmata, Justin Eduardo
MATH-EDU: Jurnal Ilmu Pendidikan Matematika Vol. 10 No. 1 (2025): MATH-EDU: Jurnal Ilmu Pendidikan Matematika
Publisher : Program Studi Pendidikan Matematika, Fakultas Ilmu Pendidikan, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jipm.v10i1.6783

The purpose of this study was to determine that the teacher's Pedagogical Knowledge in utilizing technology by using the GeoGebra application can improve the learning outcomes of junior high school students on the material of straight line equations. This type of research is Classroom Action Research (PTK) conducted in two cycles with the success indicator of 70% classical completeness. The research instruments used include observation sheets and test question sheets, with data collection techniques in the form of written tests and observations. The subjects of this study were students of class VIII A of St. Aloysius Niki-Niki Catholic Junior High School in the academic year 2023/2024, totaling 28 students. The results showed that through Pedagogical Knowledge of teachers in the utilization of technology by using the GeoGebra application can improve the learning outcomes of junior high school students on the material of straight line equations.

Co-Authors Abi, Roberto Ade Mirza admin pythagoras, admin Agnes L A Halla Agustinus Giovandi Laki Agustinus Giovandi Laki Ahzan, Z.N. Ahzan, Zulkaidah Nur Aloisius Loka Son Astriani Dewi, Ni Putu Yuni Atencia, Bryant Bennet D Atencia, Bryant Bennet D. Baldemor, Milagros R. Bana, Marten Luter Bano, Elinora Naikteas Bantaika, Aris Benu, Kristiani Benu, Luky Wandika Bernadeta Buik Bete, Hendrika Bete, Maria Erlince Bifel, Maria Gabriela Bait Bone, Dominifridus Cecilia Novianti Salsinha Chrisinta, Debora Dian Grace Ludji Elfrida Nailopo Elin, Lailin Hijriani Elisabet Ersamayori Foeh Elisabeth E Mayori Elizio Victor De Araujo Erlina, Nia Fallo, Kristoforus Ferdinandus Mone Fetronela Rambu Bobu Fitriani Fitriani Fitriani Gelu, Leonard Peter Gerhard-Wilhelm Weber Gusti Firda Khairunnisa H. Bete Hendrika Yeni Meti Hijriani, Lailin Hijriani, Lailin Hutubessy, Aditya Ida Bagus Putu Mardana Iis Aprianti Jaya Santoso Jeniana Martha Prima Asa Josua Sahala Juventianus Kenjam Juventianus Kenjam Kehi, Sefrinus Kenjam, Juventianus Klau, Kondradus Yohanes Kondradus Yohanes Klau Kono, Metriana Maria Kristofel Bere Nahak Lailin Hijriani Lidu, Maria LUDGARDIS LEDHENG Luruk, Maria Gaudensia Made Santo Gitakarma Maneno, Regolinda Margareta Rodrigues Gomes Maria Brigita Niis Nana Maria Delviana Mali Maria Erwinda Kefi, Winda Maria Naimnule Marselinus Banu Matute, Alejandro Jr. V. Melkisedik Bukifan Merlin Helentina Napitupulu Miko Purnomo Missa, Yeni mone, ferdinandus Moses Timutang Muhammad Amran Shidik Naimnule, Maria Naisau, Angela Cristina Natalia Emanuela Lelboy Nelciana Talan Ni Putu Yuni Astriani Dewi Ni Putu Yuni Astriani Dewi Ni Wayan Sukerti Nifu, Martha Marsela Nifu, Martha Marsella Oktovianus Mamoh Olo, Maria Regina Pakaenoni, Lusilia Dos Santos Pasaribu, Revi Lestari Patrisius Bauk Peter Gelu, Leonard Pius Thaal, Pius Prudensius Manek Purba, Switamy Angnitha Rita Sila, Vinsensia Ulia S. A. Purba Sanam, Thofilus Sari, Nur Nilam Seko, Herbert Sele, Yunawati Selestina Nahak Siahaan, Meiva Marthaulina Lestari Sila, Vinsensia Ulia Rita Silfester Faentaono Sirait, Debora Sitti Rosnafi’an Sumardi Sopbaba, Merlina Stanislaus Amsikan Switamy Angnitha Purba Taena, Vinsensia Gerosa Talan, Nelciana Tampani, Margarita Tavares, Ricson Thresia Trivict Semiun Uskono, Yunitha Centriana Venidora Solo, Maria Fransiska Vinsensia Ulia Rita Sila Wihelmina, Maria Wisrance Winda Ade Fitriya B Wua Laja, Yosepha Patricia Yakoba Yusina Muanley Yohanes Jefrianus Kehi Zulkaidah Nur Ahzan Zulkaidah Nur Azhan

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