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All Journal Jurnal Filsafat BAREKENG: Jurnal Ilmu Matematika dan Terapan Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Jurnal Varian JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Jurnal Statistika dan Matematika (Statmat) Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Journal of Mathematics: Theory and Applications INTAN Jurnal Penelitian Tambang VARIANSI: Journal of Statistics and Its Application on Teaching and Research Journal of Mathematics Theory and Applications
Nugraha K. F. Dethan
Universitas Timor
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering 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 Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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The Defuzzification Methods Comparison of Mamdani Fuzzy Inference System in Predicting Tofu Production Grandianus Seda Mada; Nugraha Kristiano Floresda Dethan; Andika Ellena Saufika Hakim Maharani
Jurnal Varian Vol 5 No 2 (2022)
Publisher : Universitas Bumigora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30812/varian.v5i2.1816

Abstract

One of the tofu-producing companies in Kupang City is Bintang Oesapa. With the Covid-19 pandemic,the factory needs to reconsider the amount of production by taking into account the unpredictability ofdemand and resources to minimize losses due to excessive accumulation or shortages of supplies. Indetermining the amount of production, Mamdani’s Fuzzy Inference System (FIS) can be used, whichis a method for the analysis of an uncertain system. This method has three stages in the process ofdecision making, namely fuzzification, inferencing and defuzzification. In the defuzzification stage,the FIS Mamdani has five methods, namely Centroid, Bisector, Mean of Maximum (MOM), Smallestof Maximum (SOM), and Largest of Maximum (LOM). This study discusses an application of FISMamdani with five defuzzification methods for determining daily tofu production. The purpose of thisstudy is to offer a solution by first comparing the five defuzzification methods in assessing the amount oftofu production at the Bintang Oesapa factory and then determining that which is most appropriate. Theinput variables used in this research are the amount of demand and the amount of available stock, whilethe amount of production is our variable of interest. The results showed that the best defuzzificationmethod was the MOM method with an accuracy level of 94.73% and a small error value, 5.27%. TheMOM defuzzification is expected to aid decision makers in determining the best amount of productionduring the pandemic.
Modified Hungarian Method for Solving Balanced Fuzzy Transportation Problems Fried Markus Allung Blegur; Nugraha K. F. Dethan
Jurnal Varian Vol 5 No 2 (2022)
Publisher : Universitas Bumigora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30812/varian.v5i2.1865

Abstract

This paper discusses how to solve balanced transportation problems, with transportation costs in the form of trapezoidal fuzzy numbers. Fuzzy costs are transformed into crisp costs using the Robust’s method as a ranking function. A new approach of modified Hungarian method has been applied to solve the problem of fuzzy transportation. This approach solves the fuzzy transportation problem in one stage of optimization and yields the same results as other methods that solve the problem in two stages.
APLIKASI ARITMATIKA MODULAR DALAM PENGKLASIFIKASIAN KELAS KONJUGASI GRUP DIHEDRAL ????????� Nugraha Kristiano Floresda Dethan; Faustianus Luan
STATMAT : JURNAL STATISTIKA DAN MATEMATIKA Vol 4, No 1 (2022)
Publisher : Math Program, Math and Science faculty, Pamulang University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/sm.v4i1.20408

Abstract

Misalkan ????????2 (ℝ) = {???? = [ ????11 ????12 ????21 ????22 ]: ???????????? ∈ ℝ, ????????????(????) ≠ 0}. Maka jelas bahwa ???? = [ ????????????(2????/????) ????????????(2????/????) −????????????(2????/????) ????????????(2????/????) ] dan ???? = [ 1 0 0 −1 ] merupakan dua elemen dari ????????2 (ℝ). Grup dihedral merupakan grup simetri dari poligon beraturan dengan ???? sisi yang dibangkitkan oleh ???? dan ????. Telah dilakukan suatu kajian terhadap klasifikasi kelas konjugasi dari grup dihedral ????2???? dengan menggunakan arimatika modular. Tulisan ini membahas dan membuktikan beberapa sifat dasar arimatika modular, grup dihedral, kelas konjugasi, dan kemudian kelas konjugasi untuk grup dihedral secara khusus. Hasil yang diperoleh dari kajian ini adalah terdapat tiga jenis kelas konjugasi pada grup dihedral ????2???? untuk ???? ganjil dan empat jenis kelas konjugasi pada grup dihedral ????2???? untuk ???? genap.
PENDAMPINGAN PENERAPAN TEKNOLOGI JARINGAN IRIGASI TETES PADA KELOMPOK TANI MUTIS CEMERLANG DESA NOEPESU KECAMATAN MIOMAFFO BARAT Grandianus Seda Mada; Eduardus Beo Seso Delvion; Nugraha Kristiano Floresda Dethan
Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Vol 3, No 4 (2021)
Publisher : Fakultas Teknik Universitas Diponegoro

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

Abstract

Kegiatan pengabdian masyarakat ini dilakukan pada lahan pertanian kelompok tani Mutis Cemerlang yang berada di desa Noepesu, Kecamatan Miomaffo Barat, Kabupaten Timor Tengah Utara, Provinsi Nusa Tenggara Timur. Wilayah pertanian desa Noepesu merupakan wilayah lahan kering dengan topografi berbukit dan berlereng, sebagian besar lahan merupakan lahan dengan kemiringan ± 45o yang diusahakan sebagai ladang yang ditanami beberapa jenis tanaman seperti bawang, kacang merah, wortel dan kentang. Lahan tersebut tidak pernah diairi, masyarakat hanya memanfaatkan resapan air hujan di dalam tanah serta penerapan model usaha tani konvensional menjadi pilihan satu-satunya dalam beradaptasi terhadap anomali iklim yang ekstrim. Masalah ketersediaan air ini membuat hasil panen kurang memuaskan, ukuran umbi wortel, kentang dan bawang yang relatif kecil dan jumlahnya pun tidak begitu banyak saat dipanen, sehingga diperlukan teknologi pertanian seperti irigasi tetes yang dapat mengeluarkan air terus menerus. Pengabdian ini bertujuan untuk memberikan informasi mengenai pemanfaatan teknologi jaringan irigasi tetes sebagai media pengairan. Informasi yang diberikan antara lain mengenai cara pemasangan irigasi tetes, spesifikasi bahan-bahan yang sesuai dengan kondisi lahan serta metode analisa perhitungan debit air optimal agar umur pakai irigasi tetes menjadi panjang. Metode yang digunakan dalam kegiatan ini adalah workshop dan pendampingan berkelanjutan. Hasilnya masyarakat dapat mengetahui cara pemasangan irigasi tetes, cara merawat serta tingkat produktivitas masyrakat dalam mengolah lahan pertanian meningkat karena tidak lagi terkendala keterbatasan air.
Pelatihan Pembuatan Aplikasi E-raport dengan Menggunakan Microsoft Office Excel Bagi Guru-guru SD di Wilayah Insana Fafinesu Grandianus Seda Mada; Faustianus Luan; Oktovianus R. Sikas; Nugraha K. F. Dethan
JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Vol 6 No 3 (2022): Jati Emas (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat)
Publisher : Dewan Pimpinan Daerah (DPD) Perkumpulan Dosen Indonesia Semesta (DIS) Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36339/je.v6i3.631

Abstract

The activity of filling in school data, student data, and student final grades in report card at elementary schools in the Insana Fafinesu District, Timor Tengah Utara Regency has been carried out in handwriting (conventional), which have some constraints such as taking a long time to processing grades, has a tendency to miscalculation if the student report card is lost or damaged, it does not have documentation/ back-up documents. For teachers who have sloppy handwriting, it will be difficult for a parent to read. One software that can be used in making student report cards is Microsoft Office Excel. This software is easy to understand and can overcome problems in making student report cards such as the length of time for processing grades, the tendency of grade processing error, difficulties in reading teacher writing by parents, and overcoming problems with documentation/backup documents. This service activity aims to provide training in making e-report card applications using Microsoft Excel for elementary school teachers in the Insana Fafinesu area, Timor Tengah Utara Regency. The methods used in this activity are workshops and ongoing mentoring. As a result, teachers better understand the functions in Microsoft Excel that are useful in the process of filling out student report cards, each teacher succeeds in making their own e-reports, and they agree that e-reports with Microsoft Excel are more efficient and effective than filling out report cards manually (conventional) and will use e-reports in their respective schools. The next plan for this service activity will be an application for Teacher Performance Assessment (TPA) and Employee Work Targets (EWT).
Analisis Sensitivitas Dalam Metode Analytic Hierarchy Process dan Pengaruhnya Terhadap Urutan Prioritas Pada Pemilihan Smartphone Android Yakoba Yusina Muanley; Aloisius Loka Son; Grandianus Seda Mada; Nugraha K. F. Dethan
VARIANSI: Journal of Statistics and Its application on Teaching and Research Vol. 4 No. 3 (2022)
Publisher : Program Studi Statistika Fakultas MIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/variansiunm32

Abstract

Smartphones nowadays have become a basic need for everyone because they provide many benefits and conveniences for users. People always want to have a smartphone with good quality. However, due to the lack of information along with the many types of smartphones in circulation, it often makes it difficult for users to choose a smartphone that suits their needs. To overcome these problems, it is necessary to have a method that can provide recommendations for appropriate decision-making for users. This study aims to apply the Analytic Hierarchy Process (AHP) method and sensitivity analysis in determining the priority order of smartphone selection by comparing one smartphone to another. The criteria for consideration are Facilities, Price, Battery, and RAM with alternative choices in the form of Xiaomi, Oppo, and Vivo brand smartphones. Data collection in this study was carried out by distributing questionnaires to 100 students of the Mathematics Study Program. The data were processed using the AHP method and sensitivity analysis. AHP is used to produce a more consistent ranking order of each alternative, while the sensitivity test is carried out to measure the stability of the calculation results if there is a change in decision-making. From the results of the analysis with AHP, it was found that Xiaomi was the first priority of the respondent's choice, followed by Vivo, and the last priority was Oppo with an inconsistency level of 0.02. Meanwhile, sensitivity testing shows that RAM is the most influential criterion for changing the order of alternative priorities, where Xiaomi remains the first priority, followed by Oppo, and Vivo is the last priority.
Pelatihan Pembuatan Biodiesel Bagi Pemuda Di Desa Oeolo Provinsi NTT jefry Presson; Yakobus P.E.S Agu; Marselina T.D. Tea; Lukas Pardosi; Eduardus Yosef Neonbeni; Risna Erni Yati Adu; Maria Magdalena Kolo; Nugraha Kristiano Floresda Dethan
Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Vol 7, No 1 (2023): Vol 7, No 1 (2023)
Publisher : Yogyakarta State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpmmp.v7i1.57356

Abstract

Minyak Feun Kase merupakan bahan baku pembuatan biodiesel yang efektif karena tidak bersaing dengan sektor pangan. Walaupun tanaman Feun Kase banyak tersebar di Desa Oeolo, masyarakat setempat tidak mengetahui potensi dari tanaman ini. Oleh karena itu, kegiatan pelatihan pembuatan biodiesel ini penting dilakukan dengan tujuan meningkatkan pengetahuan masyarakat muda mengenai potensi Feun Kase sebagai biodiesel, dan meningkatkan minat terhadap disiplin ilmu berbasis teknologi. Dengan demikian, kerja keras Pemerintah Indonesia dan para peneliti dapat berjalan lancar karena didukung oleh masyarakat yang memiliki pengetahuan dan ketrampilan. Kegiatan ini dilakukan dalam 6 urutan dari persiapan material sampai survei akhir dengan metode yang bervariasi seperti ceramah, kuesioner, dan pendampingan. Peserta kegiatan ini adalah anak – anak muda Desa Oeolo dengan rentang umur 20 – 30 tahun. Melalui survei menggunakan kuesioner, terlihat bahwa terjadi peningkatan pengetahuan peserta dari nilai 25 (sebelum pelatihan) menjadi 83 (sesudah pelatihan). Dari hasil survei, dapat disimpulkan bahwa kegiatan ini berdampak pada peningkatan pengetahuan sebesar 233%.
CORRELATIONS OF PHYSICAL-MECHANICAL PROPERTIES OF THE BOBONARO CLAY IN TIMOR, AND ITS IMPLICATIONS IN GEOTECHNICAL WORK: KORELASI DAN IMPLIKASI GEOTEKNIK TERHADAP SIFAT KUAT GESER LEMPUNG BOBONARO DI TIMOR Adept Titu-Eki; Nugraha K. F. Dethan
INTAN Jurnal Penelitian Tambang Vol. 6 No. 1 (2023): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56139/intan.v6i1.172

Abstract

Many geotechnical problems like slope failures and other infrastructure damage are common in civil and mining projects on the Bobonaro Clay Complex in Timor. Obtaining relevant geotechnical data for a complete engineering analysis is often time-consuming and expensive. Therefore, a study on the relationship between the parameters can be a powerful tool in these situations. Here we used multiple linear regression analysis to determine the correlation between the physical properties (clay content and plasticity index) and mechanical properties (angle of internal friction and cohesion) of the Bobonaro Clay. The data are 53 clay samples from Kupang, East Nusa Tenggara Province. These samples were from geotechnical drilling and Atterberg tests, grain size–hydrometer analysis, and unconsolidated–undrained Triaksial tests. Of all the correlation attempts, we found that only the clay content – plasticity index, and clay content – angle of internal friction exhibited a moderate correlation with a positive trend. The results of the multiple linear regression correlation also failed to express a good model; therefore, it was replaced by simple linear regression analysis. The various factors that need to be considered in a geotechnical correlation study, along with the significance and uniqueness of the Bobonaro clay, are also addressed in this article. 
Binary Logistic Regression Analysis in Determining Risk Factors of Acute Respiratory Infection (IRA) on Under-Five Children Dethan, Nugraha; Luan, Faustianus; Obe, Leonardus
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 21 No. 1 (2024): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v21i1.13505

Abstract

Acute Respiratory Infection (ARI) is a prevalent ailment and stands as one of the primary causes of mortality among children under the age of five. As reported by the Ministry of Health of the Republic of Indonesia, ARI predominantly affects children aged one to four years, with an incidence rate of 13.7%. Binary logistic regression is utilized to predict the likelihood of ARI occurrences in children under five, employing a linear combination of log-odds pertaining to suspected contributory factors. This study aims to evaluate the risk factors associated with ARI and develop an optimal logistic regression model by analyzing data from 166 participants who visited the Tarus regional health center between July 21 and September 1, 2023. Factors considered in this research as predictors for ARI (dependent variable ) include Immunization Status (X1), exposure to cigarette smoke at residence (X2), exposure to wood smoke at residence (X3), exclusive breastfeeding (X4), and nutritional status (X5). The final analysis revealed that incomplete immunization, exposure to cigarette smoke, and exposure to wood smoke at residence significantly heighten the risk of ARI. The most fitting logistic model obtained was expressed as logit (π_ijk)=-1.1051+1.2297X1+0.8709X2+1.31085X3.
Analisis Pola Simetri Pada Motif Kain Tenun Kabupaten Timor Tengah Utara Menggunakan Teori Grup Nainoe, Eldaviana; Fitriani, Fitriani; Nugraha K.F Dethan
Journal of Mathematics: Theory and Applications Vol 6 No 2 (2024)
Publisher : Program Studi Matematika Universitas Sulawesi Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31605/jomta.v6i2.3999

Abstract

Penelitian ini bertujuan untuk menggunakan teori grup untuk mengidentifikasi pola simetri pada motif kain tenun Kabupaten Timor Tengah Utara dan mengidentifikasi jenis-jenis grup simetri yang terdapat pada setiap motif kain tenun. Landasan teori yang digunakan dalam penelitian ini meliputi definisi grup, grup Abelian, dan lain-lain. Metode yang digunakan adalah studi literatur. Berdasarkan hasil penelitian, terdapat teori grup yang digunakan dalam identifikasi pola simetri pada motif kain tenun, yaitu grup Frieze. Kelompok Frieze terdiri dari kelompok Frieze yang ditemukan dari motif kain tenun Kabupaten Timor Tengah Utara adalah kelompok Frieze F1, F2, F3, F5, F6, F7 dan pola Frieze F4 yang tidak ada. Kemudian jenis kelompok simetri terdiri dari translasi, refleksi, refleksi luncuran dan rotasi.
Co-Authors Aloisius Loka Son Andika Ellena Saufika Hakim Maharani Anggelica Yunita Liu Azor Yulianus Tefa Eduardus Yosef Neonbeni Faustianus Luan Fitriani Fitriani Fitriani Fried Markus Allung Blegur jefry Presson Kolo, Maria Magdalena Luan, Faustianus Lukas Pardosi Mada, Grandianus Seda Merlyn Kristine Nelloe Nainoe, Eldaviana Obe, Leonardus Oktovianus R. Sikas Risna Erni Yati Adu Santos, Adriano Dos Tea, Marselina Theresia Djue Titu-Eki, Adept Yakoba Yusina Muanley Yakobus Pffeferius Edvend Saba Agu