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Helmi Gunawan
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Simetris
Published by Sekolah Tinggi Teknologi Ronggolawe Cepu
ISSN : 16937066     EISSN : 2686312X     DOI : https://doi.org/10.51901/simetris.v14i2.124
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering
SIMETRIS: The Journal of Technology and Applied Science is a scientific journal published regularly every six months, namely June and December. SIMETRIS: Journal of Technology and Science Accepts articles from various groups covering the study and application of theory, research results, interesting conceptual ideas in the fields of engineering and applied science. The editorial team will decide on the selection of articles to be published after receiving the results from the expert editing team. Authors will be given input from the expert editing team. SIMETRIS: Journal of Technology and Applied Science contains research articles or literature studies in Indonesian and English.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 7 Documents
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Search results for , issue "Vol 19 No 1 (2025): SIMETRIS" : 7 Documents clear
Pengaruh Pemanasan Terhadap Kualitas Minyak Goreng Dengan Metode Polarisasi Cahaya Rahayu, Ratna Dwi
SIMETRIS Vol 19 No 1 (2025): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v19i1.521

Abstract

The use of cooking oil for too long and repeatedly will cause changes in color, odor, and physical and chemical properties of the cooking oil itself. However, the public generally lacks knowledge and awareness about the quality of good cooking oil to use. As an alternative, research has been conducted on testing the quality of cooking oil based on changes in the angle of polarization of light using a polarimeter. The cooking oil to be tested was previously heated to a temperature of 100 degrees Celsius with a variation of five heating times. The results of the polarization angle change test showed that the cooking oil without heating had the smallest polarization angle of 0.2 degrees, then with five heating times the polarization angle increased to 10.9 degrees. This indicates a change in the physical properties of cooking oil that has not been heated with cooking oil that has been heated repeatedly.
Analisis Pengaruh Kedalaman Pemakanan terhadap Getaran dan Kekasaran Permukaan dalam Proses Pembubutan Baja AISI 4140 Mudjijanto, Mudjijanto; Achmadi, Ali; Agustino, Agil
SIMETRIS Vol 19 No 1 (2025): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v19i1.543

Abstract

This research was conducted to evaluate the effect of varying depth of cut on vibration levels and surface roughness during the turning process of AISI 4140 steel. The experiments were carried out using a lathe machine equipped with a carbide cutting tool, a spindle speed of 265 rpm, and a feed rate of 0.1 mm/rev. The depth of cut was varied at 0.5 mm, 1 mm, and 1.5 mm. Experimental results indicated that increasing the depth of cut significantly influenced the rise in vibration and surface roughness values. At a depth of 0.5 mm, the recorded vibration was 0.4 mm/s with a surface roughness (Ra) of 4.074 µm. Meanwhile, at depths of 1 mm and 1.5 mm, vibration increased to 1.1 mm/s and 1.8 mm/s, with surface roughness values of 4.216 µm and 5.758 µm, respectively. These findings suggest that greater depths of cut lead to higher cutting forces, which in turn elevate both vibration and surface roughness. Therefore, selecting appropriate machining parameters is crucial to achieving optimal surface quality in turning processes
IMPLEMENTATION OF MICROSERVICE ARCHITECTURE IN ONLINE SALES INFORMATION SYSTEM Sumariga, Nobi
SIMETRIS Vol 19 No 1 (2025): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v19i1.558

Abstract

Arsitektur microservices merupakan pendekatan modern dalam pengembangan perangkat lunak yang memecah sistem monolitik menjadi layanan-layanan kecil yang independen dan dapat dikembangkan serta dideploy secara terpisah. Penelitian ini mengkaji penerapan arsitektur microservices pada sistem informasi penjualan online yang memiliki kompleksitas tinggi, seperti fitur manajemen produk, proses checkout, pembayaran, pengiriman, dan layanan pelanggan. Penelitian dilakukan menggunakan metode kualitatif melalui studi literatur, analisis kebutuhan sistem, perancangan arsitektur microservices, serta simulasi komunikasi layanan menggunakan REST API dan message broker. Hasil penelitian menunjukkan bahwa arsitektur microservices memberikan keunggulan signifikan dalam hal modularitas, skalabilitas, fleksibilitas, serta kemudahan pemeliharaan dan pengembangan. Setiap layanan dapat dikelola dan diperbarui secara independen tanpa mengganggu sistem secara keseluruhan. Pengembangan paralel oleh berbagai tim memungkinkan percepatan siklus rilis dan efisiensi kerja. Selain itu, sistem lebih mudah diskalakan sesuai kebutuhan beban kerja layanan masing-masing. Namun demikian, kompleksitas sistem juga meningkat, terutama dalam pengelolaan komunikasi antar layanan, keamanan, dan konsistensi data terdistribusi. Implementasi arsitektur ini memerlukan dukungan teknologi modern seperti containerization, orchestration, service discovery, dan centralized monitoring. Kesimpulannya, microservices sangat layak diterapkan pada sistem informasi penjualan online, khususnya pada organisasi dengan kesiapan adopsi DevOps, struktur tim yang jelas, dan infrastruktur yang memadai. Pendekatan ini memberikan fondasi kuat bagi pengembangan sistem yang tangguh dan adaptif terhadap dinamika kebutuhan bisnis.
SISTEM MONITORING DAN PENDETEKSI DINI KUALITAS UDARA BERDASARKAN PARAMETER CO DAN CO2 BERBASIS IoT Ikhsan, Ridhotu Nur; Wibowo, Lastoni
SIMETRIS Vol 19 No 1 (2025): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v19i1.563

Abstract

The increasing number of motor vehicles in urban areas causes a decline in air quality due to emissions such as carbon monoxide (CO) and carbon dioxide (CO₂). If left unchecked, similar conditions may occur in Cepu City. This research developed an air quality monitoring and early warning system based on the Internet of Things (IoT) using an MQ-135 sensor to detect CO and CO₂ and a DHT22 sensor for temperature and humidity. The collected data are transmitted to the Thingspeak platform and sent to users via Telegram notifications. The device was tested for seven days at two different locations in Cepu. The results show that the system can provide real-time air quality information and early warnings to help the public take precautions against air pollution impacts
PREDIKSI KUALITAS UDARA BERDASARKAN PARAMETER CO DAN CO2 MENGGUNAKAN ARTIFICIAL NEURAL NETWORK Putri, Rosalinda Ellysa; Suprawikno, Suprawikno
SIMETRIS Vol 19 No 1 (2025): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v19i1.569

Abstract

This study aims to predict carbon monoxide (CO) and carbon dioxide (CO2) levels as indicators of air quality using the Artificial Neural Network (ANN) method with a 21-20-7 architecture. Data was collected over 28 days using the AQMSense device, with the first 21 days used for training and the remaining 7 days for testing. The results show that the ANN model effectively recognizes historical data patterns, indicated by a regression value close to 1. The prediction accuracy reached 89.96% for CO and 95.84% for CO2, demonstrating strong model performance. ANN proves to be an effective tool for daily air quality prediction and holds potential as a decision-support system for air pollution mitigation
Studi Literatur Terkini Model Generator Heffron-Phillips Prasetiyo, Ari Puji
SIMETRIS Vol 19 No 1 (2025): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v19i1.572

Abstract

This literature review examines the application and development of the Heffron–Phillips model across eight recent scholarly articles focused on the dynamic stability of electric power systems. The Heffron–Phillips model is widely utilized in SMIB configurations to linearly represent the dynamics of synchronous generators and serves as a foundation for designing and optimizing various controllers, such as PSS, supple-mentary damping controllers, and AVR. Several studies extend or modify this model to incorporate modern components, including IPFC, grid-following inverters, and machine learning-based algorithms. The review finds that the model remains highly relevant for small-signal analysis, adaptive controller design, and algorithm performance validation. However, its limitations in addressing ultra-low frequency oscillations and the nonlinear dynamics of renewable-based systems highlight the need for more advanced or frequency-domain models. Overall, the Heffron–Phillips model continues to serve as a critical foundation in power system modeling, though it must be adapted to remain effective in the increasingly complex and dynamic architecture of modern power networks.
Pengaruh Media Pendingin Terhadap Kekuatan Tarik Hasil Pengelasan SMAW Material Pipa Baja Karbon Schedule 40 Suryanto, Hendri; Ikhsan, Muhammad Arif Nur
SIMETRIS Vol 19 No 1 (2025): SIMETRIS
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v19i1.588

Abstract

Cooling media is one of the factors that affect the quality of welding results. One indicator of the quality of welding results is the tensile strength test. This test is carried out to ensure the maximum tensile strength or stress that can be sustained by the material and its ability to withstand certain mechanical loads. This study was conducted to determine the effect of several types of cooling media, namely free air, distilled water, and SAE 40 oil on the tensile strength of SCH 40 carbon steel pipe material after being welded with SMAW welding. The conclusion obtained from the test data regarding the effect of cooling media on SMAW welding of SCH 40 carbon steel pipe material shows that cooling media with SAE 40 oil has the highest tensile strength and strain values of 714.38 N/mm2 and 6.19%, while the lowest tensile strength value is produced in distilled water cooling media, namely 592.44 N/mm2 and 4.33%.

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