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Mohamad Jamil
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Journal of Science and Engineering
Published by Universitas Khairun
ISSN : 27209350     EISSN : 26213435     DOI : http://dx.doi.org/10.3387/josae
Core Subject : Science, Art, Engineering,
Arts Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
Merupakan Jurnal Ilmiah Fakultas Teknik Universitas Khairun yang memuat hasil-hasil riset bidang ilmu-ilmu teknik dan Rekayasa
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 136 Documents
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Analisis Risiko K3 Proyek Gedung Laboratorium Universitas Khairun Menggunakan HIRARC Asril Hi Djen; Edward Rizky Ahadian; Sabaruddin Sabaruddin; Annisa Rimadantia Samudra
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.11577

Abstract

Construction projects have a high level of risk, especially in occupational health and safety aspects. The laboratory building construction project at Khairun University (Unkhair) is a strategic infrastructure development that requires systematic risk management to minimize potential accidents and project losses. This study aims to identify potential hazards, assess risk levels, and determine the highest risk activities in the Unkhair laboratory building project using the HIRARC (Hazard Identification, Risk Assessment, and Risk Control) method. This research employed a quantitative descriptive approach. Primary data were collected through observation, interviews, and questionnaires involving 30 respondents from contractors and subcontractors. Risk assessment was conducted by analyzing likelihood and severity using a risk matrix based on HIRARC standards. The results identified 25 potential hazards categorized into 7 moderate risks, 16 high risks, and 2 extreme risks. Extreme risk levels were found mainly in electrical installation works and lightweight steel installation at height. Recommended risk controls include engineering controls, administrative controls, implementation of standard operating procedures (SOP), certified training, and mandatory use of personal protective equipment (PPE). The study concludes that HIRARC is effective in identifying and prioritizing occupational safety risks in building construction projects and can serve as a practical reference for improving safety performance in similar projects
EFFICIENT CONTROL OF HOUSEHOLD ELECTRICITY CONSUMPTION WITH WEMOS D1 MINI AND BLYNK IOT Made adi surya antara; I Wayan Arsa Suteja; I Gede Eka Wiantara Putra Eka Wiantara Putra; Ida Bagus Putu Widja; Kadek Reda Setiawan Suda
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.11788

Abstract

The electrical load monitoring system is a tool designed to monitor and measure electricity usage. The electrical load monitoring process uses a Wemos D1 Mini and PZEM004Tv30 model current and voltage sensor connected to an electrical load. The microcontroller used is the Wemos D1 Mini microcontroller which functions as the main control system that will be connected to a 16x2 LCD monitor with the aim of being monitored in real time and can be read directly on the LCD. By conducting experiments assembling the PZEM004Tv30 and Blynk IoT with the Wemos D1 Mini which produces a monitoring feature for power, energy, voltage, and current measurement readings. The result of this research is a household electricity measurement monitoring system that real times could monitoring anywhere through a prototype made using the Blynk IoT and PZEM004Tv30 sensor models with PZEM004Tv30 equipped with a 16x2 LCD to monitor the electrical energy load from household electronic devices in the form of current readings and equipped with a LCD 16x2 that displays when the load is detected the specified usage limit. The results of the error percentage test were obtained from the PZEM004Tv30 sensor measurement with the Wemos D1 Mini Microcontroller against the digital clamp meter. The ironing clothes load on the PZEM004Tv30 sensor measured current is 1.14 amperes while the measurement result on the Digital Clamp Meter is 1.12 Amperes. The error percentage of the PZEM004Tv30 against the digital clamp meter is 1.8%. The measurement results show that the prototype tool can be used as a current monitoring tool for electrical loads, with experiments using the PZEM004Tv30sensor being able to monitor properly and correctly the electricity usage and its usage capacity on household loads.
ANALISA POTENSI EROSI DI SUB DAS (DAERAH ALIRAN SUNGAI) KOBE KECAMATAN WEDA TENGAH KABUPATEN HALMAHERA TENGAH Zulkarnain K Misbah; Muhammad Taufiq Yudha Saputra
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.11796

Abstract

The Kobe Sub Watershed is the closest river to the nickel mining area, thus affecting the characteristics of the Sub Watershed. The Kobe Sub Watershed (Watershed) is also a source of water for the daily needs of the people in Kobe Village and its surroundings. The decline of natural resources is inevitable, especially land and water resources, including the condition of the Sub-Watershed. The purpose of this study is to determine the runoff discharge value in each area reviewed in the Kobe Sub Watershed, to find out and classify the annual erosion potential in the Kobe Sub Watershed and to determine the percentage of land criticality in the Kobe Sub Watershed. The method of analysis of erosion potential uses the USLE Modification method based on the Geographic Information System (ArcGis). After calculating the erosion rate in the Kobe Sub Watershed in 4 zones with the USLE Modification method, different results were obtained. Zone I with a potential erosion rate of 7,800,332 tons/ha/year, zone II with an erosion rate of 6,901,822 tons/ha/year, zone III with an erosion rate of 6,912.75 tons/ha/year, zone IV 6,893,576 tons/ha/year. 3. The level of erosion hazard in the Kobe Sub Watershed is said to be severe, the rate of erosion is said to be severe because it causes land to become critical, and the percentage of erosion hazard level ranges from Very Heavy with a percentage of 3%, Heavy 21%, Medium 47% and Light 29%. With land criticality in the Kobe Sub-Watershed which is divided into four, namely Critical Potential with a percentage of 29%, semi-critical with a percentage of 47%, critical with a percentage of 21%, and very critical with a percentage of 3%.
Optimalization of Solid Waste Transportation in Geger District, Madiun Rhenny Ratnawati; Aulia Nur Febrianti; Triana Triana
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.11807

Abstract

This study aims to evaluate the performance of the solid waste transportation system in Geger District and determine the required transportation capacity to improve service coverage. The research involved the collection of primary and secondary data, including waste generation rates, transportation routes, and fleet characteristics (type, capacity, service area, and quantity). Fielad observations were conducted to quantity waste accumulation at temporary disposal sites, while fleet operational duration was analyzed through direct vehicle tracking. The performance assessment indicates that the current waste collection and transportation coverage is only 7.45%, demonstrating a significant gap between service capacity and waste generation. Operational analysis reveals inefficiencies in fleet utilization and routing. System optimization was conducted by estimating the required number of transportation units based on waste generation and service demand. Furthermore, a SWOT analysis was applied to formulate strategic improvements. The results suggest that enhancing fleet capacity, optimizing operational schedules, and improving TPS infrastructure are critical to increasing system performance. These findings provide a technical basis for developing a more efficient and sustainable solid waste transportation system in Geger District.
Studi Eksperimental: Hubungan Media Pendinginan Dengan Kekerasan Dan Struktur Mikro Aluminium Bekas Profil Dengan Metode Lost Foam Casting Bambang Tjiroso
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.11911

Abstract

AbstractThis study aims to explore the relationship between the cooling medium and the hardness and microstructure of used aluminum profiles processed using the Lost Foam Casting (LFC) method. Results Hardness testing using the Rockwell A method was conducted, yielding hardness values of 19.08 HRA for water cooling, 20.03 HRA for oil cooling, and 19.03 HRA for air cooling. Rapid cooling media such as water or oil generally increase material hardness compared to air cooling; however, the specific order and magnitude of the differences may vary depending on material properties and the heat treatment parameters used. These hardness differences are related to microstructure: media with higher cooling rates (water and especially oil) tend to produce finer α-Al grains and a better distribution of the Al–Si phase, whereas air cooling allows for larger grains and higher porosity, resulting in slightly lower hardness.
Evaluasi Persepsi Dan Kepuasan Penumpang Pada Layanan Kapal Feri Rute Sofifi–Tidore Hatta Annur; Rifani Muhammad; Budiman A. Majid
Journal of Science and Engineering Vol 9 No 1 (2026): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v9i1.12642

Abstract

Konektivitas laut menjadi kebutuhan utama bagi masyarakat di wilayah kepulauan, termasuk hubungan Sofifi–Tidore di Maluku Utara. Penelitian ini dilakukan untuk mengetahui bagaimana pengguna menilai pelayanan kapal feri pada rute tersebut dan untuk menguji keterkaitan antara persepsi dengan kepuasan. Metode yang digunakan adalah survei kuantitatif terhadap 50 penumpang yang dipilih secara accidental sampling. Kuesioner menggunakan skala Likert lima tingkat dan telah melalui pengujian validitas serta reliabilitas. Data dianalisis melalui statistik deskriptif, korelasi Pearson, dan regresi linear sederhana. Hasil menunjukkan skor persepsi kenyamanan 3,40; keselamatan 3,51; ketepatan waktu 3,14; pelayanan petugas 3,51; dan harga tiket 3,04. Pada dimensi kepuasan, tangible memperoleh 3,16, reliability 3,14, responsiveness 3,47, assurance 3,51, dan empathy 3,70. Nilai rata-rata kepuasan adalah 3,39 dan termasuk kategori cukup puas. Seluruh 15 butir instrumen valid, sedangkan Cronbach’s Alpha sebesar 0,889 menunjukkan konsistensi internal yang baik. Korelasi antara persepsi dan kepuasan mencapai r=0,683 dengan p<0,001. Analisis regresi memperoleh R²=0,466 dengan koefisien persepsi 0,118. Hasil tersebut menunjukkan bahwa persepsi pengguna merupakan faktor yang berhubungan positif dengan kepuasan. Perbaikan sebaiknya diprioritaskan pada ketepatan jadwal, keandalan informasi, fasilitas, kebersihan, dan keterjangkauan tarif.

Page 14 of 14 | Total Record : 136

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