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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) TELKOMNIKA (Telecommunication Computing Electronics and Control) JURNAL ELEKTRO ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Proceeding of the Electrical Engineering Computer Science and Informatics Jurnal ELTIKOM : Jurnal Teknik Elektro, Teknologi Informasi dan Komputer Sinkron : Jurnal dan Penelitian Teknik Informatika CogITo Smart Journal MITRA: Jurnal Pemberdayaan Masyarakat Jurnal Mantik Jurnal Pengabdian Masyarakat Charitas Metris: Jurnal Sains dan Teknologi Cylinder : Jurnal Ilmiah Teknik Mesin
Bachri, Karel Octavianus
Universitas Katolik Indonesia Atma Jaya
Aerospace Engineering Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences

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Rancang Bangun Fasilitas Cuci Tangan Pintar Untuk Lembaga Bimbingan Belajar Hikari Darmawan, Marten; Soewono, Arka Dwinanda; Hutagalung, Rory Anthony; Bachri, Karel Octavianus; Anthony , Jean; Setiawan, Axel Gilbert
Jurnal Pengabdian Masyarakat Charitas Vol. 3 No. 02 (2023): Jurnal Pengabdian Masyarakat Charitas Desember 2023
Publisher : Program Studi Teknik Industri, Fakultas Teknik, Universitas Katolik Indonesia Atma Jaya Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/charitas.v3i02.4965

Abstract

Indonesia is one of the countries affected by the COVID-19 pandemic. One of the most effective ways to prevent the spread of the COVID-19 virus is by regularly washing hands with soap for 20 seconds. With the pandemic conditions improving and the government lifting COVID restrictions, learning institutions can continue learning activities with the requirement that they obey strict health protocols. One of the private tutoring institutions in Tangerang that has resumed operations is Hikari Private Tutoring. With many people using the same facilities for educational activities, Hikari Private Tutoring is required to provide facilities for washing hands. Based on the inputs from Hikari Private Tutoring management, a touchless hand-washing facility was designed to minimize COVID-19 transmission. The hand washing facility also has an LCD to play videos of correct hand washing procedures and show how long the user has washed their hands. At the end of this activity, the manager and staff of Hikari Private Tutoring were asked to fill out a questionnaire. The results showed that they were satisfied with the functionality of the touchless hand-washing facilities. This hand-washing facility can hopefully help educate the public, particularly the staff and students of Private Tutoring, on the correct technique to wash their hands and prevent the spread of COVID-19.
Survey Paper: Optimization and Monitoring of Kubernetes Cluster using Various Approaches Hadikusuma, Ridwan Satrio; Lukas; Karel Octavianus Bachri
Sinkron : jurnal dan penelitian teknik informatika Vol. 7 No. 3 (2023): Article Research Volume 7 Issue 3, July 2023
Publisher : Politeknik Ganesha Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33395/sinkron.v8i3.12424

Abstract

This research compares different methods for optimizing and monitoring Kubernetes clusters. Three referenced journals are analyzed: "Kubernetes cluster optimization using hybrid shared-state scheduling framework" by Oana-Mihaela Ungureanu, Călin Vlădeanu, Robert Kooij; "Monitoring Kubernetes Clusters Using Prometheus and Grafana" by Salma Rachman Dira, Muhammad Arif Fadhly Ridha; and "Cluster Frameworks for Efficient Scheduling and Resource Allocation in Data Center Networks: A Survey" by Kun Wang, Qihua Zhou, Song Guo, and Jiangtao Luo. These journals explore various approaches to optimizing and monitoring Kubernetes clusters. This review concludes that selecting appropriate technologies for optimizing and monitoring Kubernetes clusters can enhance performance and resource management efficiency in data centre networks. The research addresses the problem of improving Kubernetes cluster performance through optimization and efficient monitoring. The required methods include utilizing hybrid state-sharing scheduling frameworks, implementing Prometheus and Grafana for monitoring, and employing efficient cluster frameworks. The study's findings demonstrate that adopting a hybrid shared-state scheduling framework can improve Kubernetes cluster performance. Additionally, leveraging Prometheus and Grafana as monitoring tools offer valuable insights into cluster health and performance. The survey also reveals various cluster frameworks that enable efficient scheduling and resource allocation in data centre networks. In conclusion, this research emphasizes the significance of employing suitable technologies to optimize and monitor Kubernetes clusters, leading to enhanced performance and efficient resource management in data centre networks. By leveraging appropriate scheduling frameworks and monitoring tools, organizations can optimize their utilization of Kubernetes clusters and ensure efficient resource allocation
Student Organization Website with E-Voting Feature by Using Student Card Verification Concept Design Paskalis, Yohanes Maria Jonathan Glenn; Bachri, Karel Octavianus
Sinkron : jurnal dan penelitian teknik informatika Vol. 8 No. 3 (2024): Research Artikel Volume 8 Issue 3, July 2024
Publisher : Politeknik Ganesha Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33395/sinkron.v8i3.13734

Abstract

Student organizations hold an election to decide their next head and vice head every year. The best voting method for student organizations is to use an independent website with a voting system. The voting system can use students’ identity card and their student email as base for verification. OCR and face detection can be used for extracting all the needed information to validate the student card and verify it with the corresponding student email input. Other than the voting system, the website can be used to promote the student organization itself. The website was built using Nuxt for its front-end, Firebase for its back-end, and Cloud Vision API for its OCR and face detection module. There is a Lighthouse test, a stress test for the voting system, and a test to determine the optimal file size for the voting system. The results are a website that has an average Lighthouse score of 97.58. The stress test, which used a script that does submission repeatedly, results suggest that the voting system can handle up to 2000 voters at the same time. The optimal file size determined by the authors to be 500KB as the result of its test. The conclusions are a great performing website with a voting system can be built using Nuxt and Firebase, the voting system can be improved by adding another step of verification, and it’s best to use and image with a file size above 250KB when using Cloud Vision API for optimal results
Heart Sound Processing for Early Diagnostic of Heart Abnormalities using Support Vector Machine Paschalis, Sebastian Michael; Hutapea, Duma Kristina Yanti; Bachri, Karel Octavianus
Jurnal ELTIKOM : Jurnal Teknik Elektro, Teknologi Informasi dan Komputer Vol. 8 No. 1 (2024)
Publisher : P3M Politeknik Negeri Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31961/eltikom.v8i1.1031

Abstract

This paper addresses the critical issue of cardiovascular disease (CVD), the leading cause of global mortality, emphasizing the imperative for effective and early detection to mitigate CVD-related deaths. The research problem underscores the urgency of developing advanced diagnostic tools to identify heart abnormalities promptly. The primary objective is to create a Support Vector Machine (SVM) algorithm for accurate classification of different heart conditions, namely Normal heart, Mitral Stenosis, and Mitral Regurgitation. To achieve this objective, the study utilizes a dataset of heart sounds available online using a 10-fold cross-validation method. The focus is on evaluating the efficacy of various kernel functions within the SVM framework for heart sound classification. The findings demonstrate that the linear kernel exhibits superior accuracy and robustness in effectively classifying heart conditions. Notably, the proposed classification method attains an impressive 96% accuracy, highlighting its potential as a reliable tool for early detection of cardiovascular diseases. This research contributes to the ongoing efforts to enhance diagnostic capabilities and ultimately reduce the global burden of CVD-related fatalities.
The Analytical Design and Implementation of Inverted Pendulum Control System using Linear Quadratic Regulator PUTRA, SADIANA; SIREGAR, MARSUL; BACHRI, KAREL OCTAVIANUS
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 12, No 3: Published July 2024
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v12i3.625

Abstract

ABSTRAKMakalah ini menyajikan proses rancang bangun sistem kendali pendulum terbalik dengan menggunakan metode LQR. Model sistem diperoleh dengan melakukan analisis free body diagram dari sistem pendulum terbalik kemudian setelah diperoleh model sistem dilanjutkan dengan membuat persamaan ruang keadaan yang selanjutnya digunakan untuk sistem kendali LQR di mana energi yang digunakan dapat diatur sesuai dengan kebutuhan. Digunakan 10 skenario untuk mendapatkan kriteria perancangan yang diinginkan. Penentuan skenario yang tepat dapat dilakukan dengan simulasi MATLAB sehingga dapat dilihat tanggapan sistem dengan menentukan koefisien matriks Q dan matriks R yang tepat. Melalui beberapa pengujian dapat ditunjukkan bahwa untuk menjaga pendulum tetap stabil diperlukan pengaturan energi yang tepat.Kata kunci: LQR, MATLAB, pendulum terbalik, variabel keadaan ABSTRACTThis paper presents the design process of an inverted pendulum control system using the LQR method. The system model is obtained by analyzing the free body diagram of the inverted pendulum system, then after obtaining the system model, proceed with creating a state space equation which is then used for the LQR control system where the energy used can be adjusted according to needs. 10 scenarios were used to obtain the desired design criteria. Determining the right scenario can be done using MATLAB simulation so that the system response can be seen by determining the correct Q matrix and R matrix coefficients. Through several tests it can be shown that to keep the pendulum stable it requires proper energy settings.Keywords: LQR, MATLAB, inverted pendulum, state-variable
Evaluation of The Impact of Photovoltaic Laboratories Development on Higher Education and Industry SIREGAR, MARSUL; PARDOSI, CRISTONI HASIHOLAN; BACHRI, KAREL OCTAVIANUS; NUR, TAJUDDIN; PANDJAITAN, LANNY W.
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 12, No 3: Published July 2024
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v12i3.759

Abstract

ABSTRAK Transisi energi dari energi konvensional ke energi terbarukan semakin meningkat, sejalan dengan kesadaran akan keberlanjutan penggunaan energi terbarukan secara global. Laboratorium Fotovoltaik Universitas Katolik Indonesia Atma Jaya berkapasitas 5,2 kWp dikembangkan untuk mendukung pendidikan dan pelatihan industri. Tulisan ini menjelaskan dampak positif Laboratorium terhadap sudut pandang mahasiswa dan industri, yaitu tentang kinerja panel surya, evaluasi sistem on-grid dan off-grid, serta pemeliharaan system. Berdasarkan kepuasan mahasiswa disimpulkan sangat puas dan puas berkisar 93,17%, dengan rincian sangat puas 50,14%, dan puas 43,03%. Sedangkan Industri menunjukkan sangat puas dan puas sebesar 93,96%, dengan rincian sangat puas 44,99%, dan puas 48,97%. Kata kunci: Fotovoltaik, Energi Surya, Pendidikan Tinggi, Studi Eksploratori.  ABSTRACT The energy transition from conventional energy to renewable energy is increasing, in line with the awareness of the sustainability of renewable energy use globally. The Atma Jaya Catholic University Photovoltaic Laboratory with a capacity of 5.2 kWp was developed to support industrial education and training. This paper describes the positive impact of the Laboratory from the perspective of students and industry, namely on the performance of solar panels, evaluation of on-grid and off-grid systems, and system maintenance. Based on student satisfaction, it is concluded that very satisfied and satisfied are around 93.17%, with details of very satisfied 50.14%, and satisfied 43.03%. While the industry shows very satisfied and satisfied of 93.96%, with details of very satisfied 44.99%, and satisfied 48.97%. Keywords: Photovoltaic, Solar Energy, Higher Education, Exploratory Study.
METODE UJI DISOLVED GAS ANALYSIS METODE ROGERS RATIO DENGAN SIMULASI MATLAB Kartadinata, V. Budi; Putera, Michael Deni Perdana; Wahju, Marsellinus Bachtiar; Bachri, Karel Octavianus
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 8 No 1 (2022): APRIL 2022
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v8i1.3909

Abstract

Transformator atau Trafo adalah sebuah alat listrik statis yang berfungsi mentranfromasikan level tegangan dari tinggi ke rendah atau sebaliknya. Trafo dapat mengubah tegangan arus bolak-balik. Trafo sangat penting dalam kelangsungan listrik pada Pembangkit Listrik Tenaga Gas dan Uap (PLTGU) Kinerja Trafo harus semaksimal mungkin karena memiliki peranan vital pada pembangkitan listrik. Trafo yang kerja terus menerus jika sudah bertahun-tahun pasti kualitas dari Trafo akan menurun dan jika dibiarkan bisa menjadi rusak. Maka dari itu diperlukan perawatan dan pemeliharaan secara berkala serta penerapan pengujian pada trafo sehingga kinerjanya stabil. Ada beberapa metode yaitu: Tan Delta, DFR, Insulation Resistance, Polarity Index, Winding Resistance, Turn Ratio, DGA, Furan Test, Degree Polymerization, SFRA, Insulation Resistance Tester. Furan Test atau tes kertas isolator pada transformator. Dari cara tersebut, dapat diketahui apa yang harus dilakukan terhadap trafo tersebut, seperti memperbaikinya atau menggantinya dengan yang baru. Tujuan dari penelitian ini adalah untuk mensimulasikan jumlah gas dan kesalahan pada trafo dari kandungan gas yang didapat, dengan metode Rogers Ratio. Simulasi ini menggunakan aplikasi bernama MATLAB 2020. Jumlah gas yang berupa angka dari 0 sampai 5 dari 6 macam gas akan menampilkan beberapa macam fault dari Transformator. Pada simulasi ini akan menunjukan fault dari transformator dari jumlah gas yang didapat.
UPAYA PERBAIKAN SISTEM MONITORING PERSEDIAAN DENGAN PERANCANGAN ENTITY RELATIONSHIP DIAGRAM (ERD) SEBAGAI DASAR PERANCANGAN STUDI KASUS DI UD "X" Bachtiar, Marsellinus; Alvinson, Gregorius; Bachri, Karel Octavianus
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 8 No 1 (2022): APRIL 2022
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v8i1.3910

Abstract

Pada era Industry 4.0, perusahaan sudah menerapkan analisa perancangan sistem informasi, karena teknologi informasi ini merupakan salah satu teknologi yang tentunya berkembang sampai saat ini. Penggunaan data dalam praktek bisnis perusahaan merupakan suatu persyaratan – terutama pengelolaan persediaan bagi perusahaan dagang atau perusahaan manufaktur. Tujuan dari penulisan paper ini adalah perancangan pondasi untuk pengelolaan data persediaan. Tujuan akhir nya adalah adanya system informasi yang mampu mengintegrasikan berbagai proses bisnis di UD.X – sebagai UKMM sehingga dapat beroperasi secara efisien. Permasalahan saat ini adalah adanya kesalahan pencatatan yang berakibat pada kesulitan monitoring persediaan secara akurat. Pencatatan yang masih menggunakan system manual memunculkan potensi inefisiensi pelaporan , dari sisi waktu , akurasi dan validasi. Perancangan system menggunakan metodologi SDLC (System Development Life Cycle). Dalam perancangan system database digunakan ERD (Entity Relationship Diagram). Hasil dari perancangan adalah sampai dengan perancangan ERD sebagai landasan system database untuk mendukung sistem informasi persediaan.
Perancangan dan Implementasi Wiper Otomatis pada Helm Berbasis Mikrokontroler Bunardi, Marcelinus Eric; Bachri, Karel Octavianus
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 8 No 2 (2022): OKTOBER 2022
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v8i2.3937

Abstract

Seiring perkembangan zaman, jumlah penduduk Indonesia terus meningkat dan berpengaruh pada persaingan hidup terutama di kota-kota besar. Mayoritas masyarakat Indonesia memilih sepeda motor sebagai moda transportasi utama dalam beraktivitas sehari-hari. Namun menurut KORLANTAS POLRI, sepeda motor adalah jenis kendaraan bermotor yang memiliki angka kecelakaan paling tinggi dari jenis kendaraan lainnya sebanyak 5.309 kecelakaan selama dua triwulan terakhir di seluruh Indonesia yang salah satu faktor penyebabnya adalah visibilitas yang semakin rendah akibat hujan. Dengan adanya wiper yang ditempatkan pada kaca helm, hal ini akan meminimalisir potensi kecelakaan pengguna sepeda motor akibat faktor visibilitas ketika berkendara saat hujan. Implementasi wiper ini menggunakan sensor hujan yang dihubungkan dengan mikrokontroler Arduino Nano sehingga memungkinkan untuk bekerja secara otomatis hanya ketika cuaca hujan. Ketika cuaca cerah pengendara sepeda motor pasti selalu terpapar oleh sinar matahari, sehingga wiper ini memanfaatkan energi terbarukan dari sinar matahari untuk digunakan sebagai pengisi daya baterai yang digunakan sebagai sumber daya pada wiper. Pengujian dilakukan dalam beberapa tahap yaitu pengujian perangkat keras yang meliputi pengujian pengisian daya dan penggerak wiper, pengujian perangkat lunak, dan pengujian keseluruhan. Dari hasil pengujian dapat diperoleh bahwa sistem dapat bekerja dengan baik untuk mendeteksi cuaca hujan secara otomatis maupun proses pengisian daya.
Rancang Bangun Alat Kompres Demam Digital Suhu Hangat Bachri, Karel Octavianus; Kevin, Kevin; Sereati, Catherine Olivia
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 10 No 1 (2024): APRIL 2024
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v10i1.5479

Abstract

In this research, a digital fever compress device based on Arduino Uno was designed, utilizing warm temperature as a method for fever management. The device is equipped with a temperature sensor DHT, liquid crystal display (LCD), relay, and cartridge heater to create precise and controlled warm temperatures. The objective of this research is to design a digital fever compress device capable of generating warm temperatures ranging from 37.5°C to 42°C using Arduino Uno as the main microcontroller. The design process involved creating a model of temperature and tension equations, where the influential variables include ambient temperature, upper limit, and lower limit. Result shows the difference of the temperature values over time with the overall standard deviation of 1.4894, 1.6480, and 1.6217 and the overall standard deviation of the maxima and minima of 0.8085. The test results also indicated outcomes beyond the limits due to the large sampling time.
Co-Authors Adang Suwandi Ahmad Alexander, Justin Alfi Nabil Alvinson, Gregorius Anthon de Fretes, Anthon de Fretes Anthony , Jean Arwin Datumaya Wahyudi Sumari Bachtiar, Marsellinus Bambang Anggoro Soedjarno Bunardi, Marcelinus Eric Catherine Olivia Sereati Christine Natalia David Herianto Duma Kristina Yanti Hutapea Duma Kristina Yanti Hutapea Enny Widawati Febryan Sutomo Hadikusuma, Ridwan Satrio Haenuki Sachi Hutapea, Duma Kristina Yanti Karangga, Yusaphat Phosa Kartadinata, Budi Kelvin, Dimas Kevin kevin Khayam, Umar Lestari, Hesti Tri Lukas Maria Angela Kartawidjaja Marsellinus Bachtiar Wahju Marten Darmawan Melisa Mulyadi Micha Thesania Katarine Michael Deni Perdana Putera Nico Fernanto Nova Eka Budiyanta Nur, Tajuddin Osmond, Edbert Pandjaitan, Lanny W. PANJAITAN, LANNY Pardosi, Cristoni Hasiholan Paschalis, Sebastian Michael Paskalis, Yohanes Maria Jonathan Glenn PRAWIRA, WASKITO Putera, Michael Deni Perdana PUTRA, SADIANA Rizki Surya Permana Rory Anthony Hutagalung Sandra Octaviani Sandra Octaviani Setiawan, Axel Gilbert Siregar, Marsul Soewono, Arka D. Soewono, Arka Dwinanda Tajuddin Nur Theresia Ghozali Trifenaus Prabu Hidayat Veronica Windha Mahyastuty Wahju, Marsellinus Bachtiar Widodo Basuki Wijaya, Nickolas Dario Wijaya, Toby Wijayanti, Linda Willy Kusmanto Wilson