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All Journal Jurnal Sains Matematika dan Statistika AKSIOMA JURNAL EKSAKTA PENDIDIKAN (JEP) AXIOM : Jurnal Pendidikan dan Matematika Eksakta : Berkala Ilmiah Bidang MIPA Pelita Eksakta Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika Jurnal Kajian Matematika dan Aplikasinya Journal of Mathematics UNP Rangkiang Mathematics Journal Jurnal Edukasi dan Penelitian Matematika

Defri Ahmad

Universitas Negeri Padang

Author-ID : 2591774

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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APLIKASI ROF TOTAL VARIATION MENGGUNAKAN SPLIT BREGMAN UNTUK MENGURANGI NOISE PADA GAMBAR PEMBULUH DARAH KAPILER DALAM JARI MANUSIA Mochammad Hafiizh; Vita Kusumasari; Defri Ahmad
Jurnal Kajian Matematika dan Aplikasinya (JKMA) Vol 1, No 1 (2020): July
Publisher : UNIVERSITAS NEGERI MALANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um055v1i12020p33-36

An image might have noises that could lose important information on that image. As a consequence, we need a consistent method to reduce the noise without erasing the important information. In this paper, ROF Total Variation using Split Bregman is applied to the image to reduce the noise. We choose the monochrome image of the human capillaries on the fingertips.

Application Of Mathematical Literacy In Mathematics Learning For Elementary School Fadhilah Fitri; Dina Fitria; Fridgo Tasman; Defri Ahmad; Suherman Suherman
Pelita Eksakta Vol 2 No 2 (2019): Pelita Eksakta Vol. 2 No. 2
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol2-iss2/75

Mathematical literacy requires individuals to solve a problem and also apply mathematics in everyday problems, which results in the ability to interpret solutions to those problems. In PISA it is known that Indonesia's mathematics literacy score is among the lowest, as well as in Guguk District Lima Puluh Kota Regency. One way to overcome this is to start introducing literacy to students early on. The introduction of literacy must be instilled in students since they are still in elementary school. Based on this, a training program and workshop was held regarding the application of mathematical literacy in mathematics learning in elementary schools in Guguak District with elementary school mathematics teacher partners who are members of the KKG SD Gugus III Kecamatan Guguak Kabupaten Lima Puluh Kota.

Training and Workshop to Apply Mathematical Literacy in Classroom for Mathematics Teachers in Dharmasraya Defri Ahmad; Syafriandi Syafriandi; Jazwinarti Jazwinarti
Pelita Eksakta Vol 2 No 1 (2019): Pelita Eksakta Vol. 2 No. 1
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol2-iss1/62

Abstract – 4.0 industry revolution era brings people to have multi-skill ability to survive. In order to prepare multi-skill people Indonesian government create school literacy actions, but this program needs some teachers with strong understanding about literacy. In fact, many teacher do not understand to much about literacy. They only think that literacy is about read. To solve this problem, training and workshop about literacy is needed. Teachers have to know about literacy more spesific especialy literacy that related to their subject. A training and workshop has been done to Junior High School Mathematics teachers in Dharmasraya. In this activity, teachers study about basic understanding of literacy, and mathematical literacy. By some example, teacher try to solve, and to create some mathematics problem related to mathematics literacy. By questioneering this activity teachers say that this program is very good in material, instructor, and activity.

Workshop on High Order Thinking Skills Mathematical Problems to Increase Teachers Teaching Abilities Defri Ahmad; Syafriandi Syafriandi; Media Rosha
Pelita Eksakta Vol 3 No 1 (2020): Pelita Eksakta Vol. 3 No. 1
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol3-iss1/110

Abstract – To accomodate High Order Thinking Skills (HOTS) in classrom, we need to consider curricula, learning process, and assesment. Learning process and assesment have an essential requirement i.e. teacher’s ability. Government has done some activity to increase teacher’s ability to apply HOTS in classrom, but teachers need more. To keep their motivation and ability, teachers need a continue activity related to HOTS. Lecturer is an academic expert who teach in university level. In Indonesia, service to community is one of obligation for lecturer. Hence increasing teachers understanding about HOTS is one of lecturer’s duty. Training and workshops has been designed to rose teachers ability in creating HOTS problems and teaching using those problems. In this activity, teachers are studied about HOTS concept, the government policy about HOTS, solve some HOTS problem in National level test, and how to create HOTS base mathematical problems. For the next activity, teachers are asked to create some HOTS base mathematical problems, and design a learning trajectoty/ design to put their HOTS problem in learning process. Lastly, base on teacher’s satisfaction questionnaire, teachers are very happy to get this activity for the activity’s programme, mastery of topics, and teacher ‘s needs.

Jalur Evakuasi Tsunami pada Sistem Operasi Android Menggunakan Algoritma Djikstra Defri Ahmad; Rara Sandy Winanda; Hafis Alrizal
Jurnal Sains Matematika dan Statistika Vol 7, No 1 (2021): JSMS Januari 2021
Publisher : Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/jsms.v7i1.12222

Padang adalah salah satu kota yang rentan terhadap tsunami, akan tetapi masyarakat yang tinggal/ bekerja di tepi pantai sangat ramai sehingga evakuasi secara horizontal tak mungkin dilakukan. Karena itu, dalam penelitian ini evakuasi dilakukan secara vertikal. Untuk menentukan jalur evakuasi tsunami terpendek di Kota Padang dalam tulisan ini digunakan Algoritma Djikstra. Dalam Algoritma Djikstra penentuan jalur terpendek dapat dicari untuk semua pasangan simpul. Penelitian ini adalah penelitian terapan yang dimulai dengan mempelajari dan menganalisis teori-teori yang relevan dengan masalah, kemudian dilanjutkan dengan pengambilan data. Penelitian ini dimulai dengan mengubah peta yang diunduh dari Google Map menjadi graf berbobot, kemudian graf tersebut diubah menjadi matriks ketetanggaan dan diproses menggunakan Algoritma Djikstra. Hasil pemrosesan aplikasi menggunakan Algoritma Djikstra memperoleh jalur evakuasi tsunami terpendek yang dapat dilewati ke tempat penampungan terdekat berdasarkan posisi pengguna perangkat android.

Kesulitan Mahasiswa Dalam Mengkoneksikan Sigma, Area, dan Definisi Integral Tentu Secara Geometri Fridgo Tasman; Defri Ahmad; Suherman Suherman
JURNAL EKSAKTA PENDIDIKAN (JEP) Vol 2 No 2 (2018): JEP: Jurnal Eksakta Pendidikan
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jep/vol2-iss2/238

Integral is one of major topics in Calculus course. Many university students fail in calculus course because their understanding on the concept of Integral especially in understanding definition of integral is low. This situation encourages us to design a calculus lesson to build students understanding on Integral especially integral definition by using Realistic Mathematics Education as an approach. For that, we try to design a series of instructional activities starting from introducing sigma to definition of Integral in order to know students difficulties in understanding this topic. Some first-year university students in Universitas Negeri Padang are chosen to test our Hypothetical Learning Trajectory (HLT) in our preliminary research. The result is students had difficulties in connecting the sigma, area and definition of integral. This happens because the students did not see that the activities that have been designed as a whole that cannot be separated. Therefore, it is recommended to design a series of instructional activities which is focus on connecting sigma, area and definition of integral.

Praktikalitas Media Video Tutorial sebagai Suplemen Digital Learning pada Mata Kuliah Persamaan Diferensial Biasa Ronal Rifandi; Defri Ahmad; Meria Ultra Gusteti
JURNAL EKSAKTA PENDIDIKAN (JEP) Vol 4 No 1 (2020): JEP : Jurnal Eksakta Pendidikan
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jep/vol4-iss1/436

Industrial revolution 4.0 in which digital technology being more integrated in all aspects of human life will demand the new reform of education world. Not only can it affect the curriculum being taught, but it will also lead to the changes of the methods and approaches in conducting the lesson. One of the changes is the use of digital learning. Universitas Negeri Padang has regulation of conducting lesson through e-learning platform proportionally for all courses, including the course of Ordinary Differential Equation. Ordinary Differential Equation is a mandatory course that should be taken by mathematics department’s students. In order to support students to develop their under standing about the concept and its application while using digital learning method, the researchers develop some tutorial video as supplementary media. Therefore, this study aimed to describe the practicality of the tutorial video. This is a descriptive research where the data were collected using closed questionnaire. The respondents were 39 mathematics students of Universitas Negeri Padang who joined Ordinary Differential Equation Course in the semester of January-June 2020. The result indicates that the video tutorials used in the course are in the category of very practice with the score percentage 86,6%.

Modul Berbasis Logika Pembuktian untuk Mengurangi Level Abstraksi Topik Grup dan Sifat-Sifatnya Defri Ahmad; Fridgo Tasman; Ronal Rifandi; Saddam Al Aziz; Rara Shandy Winanda
JURNAL EKSAKTA PENDIDIKAN (JEP) Vol 5 No 1 (2021): JEP (Jurnal Eksakta Pendidikan)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jep/vol5-iss1/573

The most essential thing in mathematics is proof, it makes mathematics being different with other subjects. One of subject in mathematics that always need prove to understand the concept is abstract algebra. In studying abstract algebra, student need various abstract concepts to include in its concepts. It is hard for student to understand the structures in abstract algebra and prove some of mathematical object that satisfy the structures. Group and its properties is the first structure in abstract algebra that has an abstract concept. It is hard for student to understand some objects, that is proven satisfy a structure and why the proof steps just flow. By giving explanation and reason in every proofing step, we try to increase student proving level and reduce the abstraction level of the concepts. To see how this module reduces the abstraction level in teaching group, this module is applied to university students and evaluated by interviewing and questionnaires to the students. Base on student response and by some perspectives, student proving ability increase and the abstraction level of the concept is diminished in some aspects.

University Students' Procrastination: A Mathematical Model (Case Studies: Student in Mathematics Department Universitas Negeri Padang) Rara Sandhy Winanda; Akira Mikail; Defri Ahmad; Dina Agustina; Rahmawati Rahmawati
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Mathematical modeling of procrastination was carried out on students in the Mathematics Department at Universitas Negeri Padang. Procrastination is the tendency to delay work and can be contagious among students. Mathematical modeling of procrastination aims to show the spread of procrastination among students. The SEIR compartment model was applied in this study. From a total of 1,154 population members, 93 samples were randomly selected and were given a questionnaire to estimate the parameter values in the model. A couple of steady states appear in the model. The free disease steady state has a biological meaning since all the variables are real, while the endemic steady state is surreal in biological terms. The number of its basic reproduction number, from which the parameter values are derived from the primary data, indicates stability analysis near the free disease steady states. The result shows that procrastination is spread among students in the population, with the number of Ro is 1,009.

Model Matematika Efek Perpindahan Polutan Pada Kolam Pertama Ke Kolam Kedua Dipengaruhi Adveksi Dan Dispersi Alya Anzira; Defri Ahmad
Journal of Mathematics UNP Vol 5, No 1 (2020): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Abstract —Pollution in the aquaculture environment can come from inedible food and not eaten by fish. In a variety of fish culture business basin become the choice for entrepreneurs, fish entrepreneurs have many basins for fish farming.Concentration of pollutans in the basin will decrease when the first basin is entering clean water, so pollutants will come out of the basin. Based on the results of research into the mathematical model of water pollution in the form of a partial differential equation system.Keywords — Mathematical Model, Water Pollution, n Basin.

Co-Authors Abdillah Janaki Daosti Ade Fauzan Akira Mikail Alya Anzira Amellia Fadjri annisa yovinda Aulia Fitri Fireza Defrisa Yoga Putra Deva Eliza Dina Agustina Dina Fitria Fadhilah Fitri Fridgo Tasman Ghaitsa Deiwa Karufa HAFIIZH, MOCHAMMAD Hafis Alrizal Indiko Prima Jazwinarti Jazwinarti Kefiano Fangelis Laksono Trisnantoro Media Rosha Melisa Melisa Mella Susriyanti Meria Ultra Gusteti Muhammad Fadhli Gusvino Muhammad Subhan Neneng Gusnela Noni Aryanti Nurul Hikmah Rahmawati Rara Sandhy Winanda Rara Sandy Winanda Rara Shandy Winanda Rida arifi Ronal Rifandi Saddam Al Aziz Suherman Suherman Suherman Suherman Syafriandi Syafriandi Tesa Nofri Handayani Ultari Femi Arshinta Vezalin, Stefanny Vita Kusumasari Wella Kurnia windi jelita Windy Septia Putri Yani Sriyanti Yani Sriyanti

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