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All Journal Journal of the Indonesian Mathematical Society SITEKIN: Jurnal Sains, Teknologi dan Industri Jurnal Abdimas BSI: Jurnal Pengabdian Kepada Masyarakat Jurnal Matematika Sains dan Teknologi Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Scientific Journal of Mechanical Engineering Kinematika Community Development Journal: Jurnal Pengabdian Masyarakat Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi SWARNA SWARNA: Jurnal Pengabdian Kepada Masyarakat Suluh Abdi: Jurnal Ilmiah Pengabdian Kepada Masyarakat
Purnami, Ndaru Atmi
Universitas Negeri Jakarta
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering 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 Materials Science & Nanotechnology Mathematics Mechanical Engineering Public Health Other

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Penentuan Koreksi Sudut Attitude pada Quadrotor Menggunakan Algoritma Zero Acceleration Compensation Shandy Avisena; Freddy Kurniawan; Ndaru Atmi Purnami
Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC) Vol 4, No 1 (2022): February
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v4i1.1109

Abstract

The orientation angle of a quadrotor UAV can be estimated from gyroscope and accelerometer data. Orientation can be predicted from gyroscope data under static or dynamic conditions, but the predicted value has accumulated errors. Meanwhile, orientation can also be calculated from accelerometer data, but only correct if the sensor is in a static state. To get a more precise orientation angle, the orientation predicted from the gyroscope data and the orientation calculated from the accelerometer data were fused using a Kalman filter. Determination of the condition of the sensor using a threshold value that is applied to the covariance of the acceleration data. in this study, the zero-acceleration compensation algorithm is used so that when the sensor is static, the orientation angle is calculated from the accelerometer. The use of this algorithm can increase the accuracy of the quadrotor orientation for roll angle to 96.84% and pitch angle to 98.91%.
Analisis Bifurkasi Persamaan Longitudinal pada Gerak Roket Tiga Dimensi Tipe RKX-Lapan Ndaru Atmi Purnami
Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC) Vol 3, No 2 (2021): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v3i2.1060

Abstract

This article discusses about longitudinal equation for the three dimensional rocket motion of RKX-Lapan. The RKX-Lapan’s rocket is guided rocket which was designed using two phases, boosting and sustaining. The rocket has six degrees of freedom movement. The freedom movements consists of three translational motions and three rotational motions which causess unstable rocket movement. Therefore, stable rocket motion system is needed. The rocket motion system is three dimensional of nonlinear equation, thus linearization process of rocket motion equation is requaired. One of this linearization process is longitudinal motion which consists of two translational motions and one rotational motion. The equation of longitudinal motion has stabilization system analysist on sustaining phase. Bifurcation analysis of longitudinal equation for the three dimensional rocket motion of RKX-Lapan has been created in this article. It determined equilibria and its equation stability character. Furthermore, bifurcation analysist on equilibria and numerical simulation have been done to find out that bifurcation value indicated a topologically nonequivalent.
KOREKSI SUDUT ATTITUDE DAN HEADING QUADROTOR DENGAN PERUBAHAN MATRIKS KOVARIAN DERAU PENGUKURAN KALMAN FILTER Muhamad Rafiq; Freddy Kurniawan; Ndaru Atmi Purnami
SITEKIN: Jurnal Sains, Teknologi dan Industri Vol 18, No 2 (2021): Juni 2021
Publisher : Fakultas Sains dan Teknologi Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/sitekin.v18i2.13336

Abstract

Data hasil perhitungan orientasi sensor akselerometer dan sensor giroskop memiliki kelemahan yang mana saat kondisi adanya percepatan, hasil orientasi dari sensor akselerometer memiliki derau yang cukup besar pada hasil rekaman data sensornya. Saat kondisi statis, hasil orientasi dari sensor giroskop memiliki derau yang cukup besar pada hasil rekaman data sensornya. Hasil orientasi dari gabungan sensor akselerometer, giroskop, dan magnetometer (IMU) menggunakan metode kalman filter masih memiliki galat yang cukup besar saat kondisi dinamis.Untuk mengurangi galat orientasi, ditambahkan algoritma mengubah nilai matriks kovarian derau pengukuran (R) guna memberikan bobot yang berbeda pada sensor akselerometer dan sensor giroskop. Pada saat kondisi dinamis nilai matriks kovarian derau pengukuran (R) akan diturunkan, hal ini bertujuan agar kalman filter memberikan bobot yang lebih besar pada data hasil pengukuran . Saat kondisi statis  nilai matriks derau pengukuran (R) kembali ke nilai semula. Hal ini bertujuan agar kalman filter lebih menggunakan data hasil proses prediksi . Dengan begitu kekurangan sensor akselerometer dan sensor giroskop dapat diminimalisir.Hasil penelitian ini berupa orientasi quadrotor dari penggabungan data sensor akselerometer, sensor girosko, dan sensor magnetometer menggunakan kalman filter dan perubahan nilai matriks kovarian derau pengukuran (R). Hasil orientasi pada penelitian ini akan dibandingkan dengan hasil orientasi pada HP. Hasil orientasi pada penelitian ini menghasilkan galat pada sikap roll sebesar 0%, pada sikap pitch sebesar 0,11% dan pada sikap yaw sebesar 26,39%.
Analisis Intensitas Konsumsi Energi (IKE) pada Institut Teknologi Dirgantara Adisutjipto (ITDA) Yogyakarta Ndaru Atmi Purnami; Refni Arianti; Paulus Setiawan
Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC) Vol 4, No 2 (2022): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v4i2.1325

Abstract

One of the main sectors that uses the largest electrical energy in a country is the commercial sector. One of the parts of this sector is education. This sector has a sub-sector. It is called a building. Electrical energy conservation efforts are needed to streamline electrical energy consumption by looking at energy-saving opportunities. This research was conducted at Halim Building and Wiweko Building in Institut Teknologi Dirgantara Adisutjipto (ITDA), Yogyakarta. The research was conducted by taking energy audit data regarding the level of electrical energy consumption as seen from the Energy Consumption Intensity (IKE) parameter. The research method began with the data collection. Furthermore, the data were processed using Ms. Excel, SPSS, and Matlab. Statistics analysis with ANOVA was carried out to conclude what parameters affected IKE. The results showed that the IKE value of the Halim Building was 30,48 kWh/m2/year and the IKE value of the Wiweko Building was 24,16 Wh/m2/year. The IKE value was still significant in the efficient category following   ESDM & JICA Electric Power Development Co. LTD standards.
Meningkatkan Minat Baca Bahasa Inggris Kepada Anak di PAUD AVICIENA Maria Asumpta Deny Kusumaningrum; Rindu Alriavindra Funny; Ndaru Atmi Purnami
SWARNA: Jurnal Pengabdian Kepada Masyarakat Vol. 3 No. 1 (2024): SWARNA: Jurnal Pengabdian Kepada Masyarakat, Januari 2024
Publisher : LPPM Sekolah Tinggi Ilmu Ekonomi 45 Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/swarna.v3i1.1163

Abstract

Tujuan dari pengabdian masyarakat ini adalah untuk memberikan pengetahuan tentang minat anak membaca buku bergambar berbahasa Inggris dan membantu mereka meningkatkan bahasa Inggrisnya. Kegiatan pengabdian kepada Masyarakat dilaksanakan selama 5 hari. Lokasi pelaksanaan di PAUD Aviciena. Sekitar 20 anak menghadiri kegiatan tersebut. Kegiatan tersebut berupa penyuluhan dan diskusi yang bertujuan untuk meningkatkan minat membaca buku bergambar berbahasa Inggris sejak dini. Membaca adalah salah satu fungsi terbaik otak manusia. Semakin muda seorang anak belajar membaca, maka ia akan semakin mudah membaca dengan lancar. Sangat penting untuk menumbuhkan kebiasaan membaca sejak dini, dan kebiasaan ini dapat ditanamkan pada diri anak Anda bahkan sejak dalam kandungan. Segala upaya untuk meningkatkan minat membaca anak harus dimulai dari lingkungan keluarga. Minat membaca mempunyai pengaruh yang sangat besar terhadap keberhasilan anak dan harus dipupuk sejak dini.
Edukasi Aplikasi UAV, Avionic dan Dunia Kerja bagi Mahasiswa dan Alumni Teknik Elektro Kedirgantaraan Lasmadi, Lasmadi; Kurniawan, Freddy; Sudibya, Bambang; Setiawan, Paulus; Purnami, Ndaru Atmi; Dermawan, Denny
Jurnal Abdimas BSI: Jurnal Pengabdian Kepada Masyarakat Vol 6, No 2 (2023): Agustus 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Universitas Bina Sarana Informatika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31294/jabdimas.v6i2.15169

Abstract

Praktek kerja lapangan merupakan sarana bagi mahasiswa untuk mendapatkan pengalaman kerja di industri.  Namun, dimasa pandemic Covid-19, beberapa perusahaan tidak dapat menerima mahasiswa secara langsung. Disisi lain, sebagian fresh graduate masih belum mendapatkan tempat kerja yang sesuai harapan. Pengabdian kepada masyarakat ini bertujuan memberikan edukasi tentang aplikasi UAV (unmanned aerial vehicles) di industri, Avionic dan dunia kerja kepada mahasiswa dan alumni Teknik Elektro Institut Teknologi Dirgantara Adisutjipto. Pengabdian masyarakat dilakukan dalam bentuk webinar melalui media zoom meeting dan dapat diikuti oleh masyarakat umum. Untuk mendapatkan umpan balik peserta, tim pengabdian menggunakan kuesioner yang dibagikan kepada peserta. Peserta cukup antusias untuk mengikuti kegiatan ini selama tiga hari berturut-turut dan dapat menerima materi pengetahuan yang diberikan oleh pemateri. Berdasarkan data kuesioner, kegiatan ini dapat meningkatkan pengetahuan dan wawasan peserta tentang aplikasi UAV, Avionic dan dunia kerja Teknik Elektro.
FIXED POINT THEOREMS FOR (ψ, ϕ, ω)-WEAK CONTRACTIONS IN COMPLETE METRIC SPACES Pasangka, Irvandi Gorby; Kleden, Maria Agustina; Putra, Ganesha Lapenangga; Purnami, Ndaru Atmi
Journal of the Indonesian Mathematical Society Vol. 30 No. 3 (2024): NOVEMBER
Publisher : IndoMS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22342/jims.30.3.1387.352-360

Abstract

In this paper, we define the mapping called (ψ, ϕ, ω)-weak contractions. We then use this definition to proof the existence of fixed point. The mapping we defined above is a modified mapping by Liu and Chai. We use the concept ω-distance to proof the fixed point theorem. Since every ω-distance is metric, then the resulting theorem also satisfy for every metric.
Meningkatkan Minat Baca Bahasa Inggris Kepada Anak di PAUD AVICIENA Kusumaningrum, Maria Asumpta Deny; Funny, Rindu Alriavindra; Purnami, Ndaru Atmi
SWARNA: Jurnal Pengabdian Kepada Masyarakat Vol. 3 No. 1 (2024): SWARNA: Jurnal Pengabdian Kepada Masyarakat, Januari 2024
Publisher : LPPM Sekolah Tinggi Ilmu Ekonomi 45 Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/swarna.v3i1.1163

Abstract

Tujuan dari pengabdian masyarakat ini adalah untuk memberikan pengetahuan tentang minat anak membaca buku bergambar berbahasa Inggris dan membantu mereka meningkatkan bahasa Inggrisnya. Kegiatan pengabdian kepada Masyarakat dilaksanakan selama 5 hari. Lokasi pelaksanaan di PAUD Aviciena. Sekitar 20 anak menghadiri kegiatan tersebut. Kegiatan tersebut berupa penyuluhan dan diskusi yang bertujuan untuk meningkatkan minat membaca buku bergambar berbahasa Inggris sejak dini. Membaca adalah salah satu fungsi terbaik otak manusia. Semakin muda seorang anak belajar membaca, maka ia akan semakin mudah membaca dengan lancar. Sangat penting untuk menumbuhkan kebiasaan membaca sejak dini, dan kebiasaan ini dapat ditanamkan pada diri anak Anda bahkan sejak dalam kandungan. Segala upaya untuk meningkatkan minat membaca anak harus dimulai dari lingkungan keluarga. Minat membaca mempunyai pengaruh yang sangat besar terhadap keberhasilan anak dan harus dipupuk sejak dini.
Mathematical Model of COVID-19 with the Influence of Vaccination Purnami, Ndaru Atmi; Prawadika, Luqman Nuradi; Pasangka, Irvandi Gorby; Findasari, Findasari; Kusumawati, Eka; Pratama, Ilham Yoga; Suharis, Ridho; Maturbongs, Nadhira Hasna
Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi Volume 13 Issue 3 December 2025
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/euler.v13i3.34182

Abstract

The COVID-19 pandemic, which first emerged at the end of 2019, has had a significant impact on people's lives around the world. In Indonesia, the outbreak began to develop in February 2020. Although the pandemic has now passed and people have started to resume their normal activities, some individuals are still being infected with COVID-19, even though the number of cases is now under control. One of the key factors in controlling COVID-19 is vaccination. The extent to which vaccination affects COVID-19 transmission will be discussed in this study. Furthermore, a numerical simulation will be conducted on this mathematical model to observe the impact of vaccination on COVID-19. The mathematical model of COVID-19 with vaccination influence will describe the interaction between six population classes, namely: the class of susceptible individuals who can be infected (Susceptible – S), the class of exposed individuals (Exposed – E), the class of vaccinated individuals who have never been infected (Vaccinated – V), the class of infected individuals (Infected – I), the class of individuals who have recovered (Recovered – R), and the class of infected individuals who have died (Death – D). It is important to note that COVID-19 is a disease caused by infection with the coronavirus. A person who has not yet been infected with the virus has the potential to be exposed. One way to prevent exposure is through vaccination. In Indonesia, vaccination has been made mandatory three times: the first dose, the second dose, and the booster. However, because the coronavirus has an incubation period, there is no guarantee that a vaccinated person has not already been exposed to the virus. Exposed individuals will become infected with COVID-19 once the incubation period ends. Infected individuals may show symptoms or be asymptomatic. An infected individual has two possible outcomes: recovery or death. The modeling is based on the SEVIRD model, with its parameters estimated using data. This study produces a mathematical model of COVID-19 with vaccination influence, showing that vaccination plays a role in controlling the spread of COVID-19.
KARAKTERISTIK ALIRAN MINYAK-AIR DENGAN RASIO VISKOSITAS RENDAH DI PIPA HORIZONTAL DENGAN CFD Eli Kumolosari; Teguh Wibowo; Ndaru Atmi Purnami
Scientific Journal of Mechanical Engineering Kinematika Vol 9 No 2 (2024): SJME Kinematika Desember 2024
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v9i2.324

Abstract

Two-phase flow is crucial in various fields, particularly in the oil industry, where oil-water flows are common in offshore production wells. Oil is transported with water during its process, and Core Annular Flow (CAF) is one flow pattern that enhances transportation efficiency. This study uses CFD simulations to analyze oil-water flow with a low viscosity ratio in a horizontal pipe (L/d = 30). The aim is to determine the superficial velocities of oil and water (Jo and Jw) that form CAF flow patterns and calculate pressure drop and water hold up. Validation was conducted using experimental data for accuracy. Results show three flow patterns: stratified flow, CAF, and wavy flow. Pressure drop increases linearly with rising J values, from 0.0414 kPa at Jo = 0.21 m/s to 0.6898 kPa at J2 = 2 m/s. The relationship between pressure drop and water hold up is nonspecific, likely due to shear stress in two-phase flow. Pressure drop in the CAF pattern is lower than in stratified flow at the same J values, aligning with theoretical predictions.
Co-Authors Bambang Sudibya, Bambang Denny Dermawan Eka Kusumawati Eka Kusumawati, Eka Eli Kumolosari Findasari Findasari Findasari Findasari Fitriana Kartikasari Freddy Kurniawan Freddy Kurniawan Irvandi Gorby Pasangka Ivanna Isty Nursani Lasmadi, Lasmadi Maria Agustina Kleden Maria Asumpta Deny Kusumaningrum Maria Asumpta Deny Kusumaningrum, Maria Asumpta Deny Maturbongs, Nadhira Hasna Muhamad Rafiq Muhammad Rido Wujudi Muhammad Rizky Ardiansyah Pratama, Ilham Yoga Prawadika, Luqman Nuradi R. Nur Akhmad Triwibowo Refni Arianti Rindu Alriavindra Funny Rindu Alriavindra Funny Setiawan, Paulus Shandy Avisena Suharis, Ridho Teguh Wibowo