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All Journal International Journal of Artificial Intelligence Research Journal of Social Research Journal of Applied Mechanical Engineering and Renewable Energy (JAMERE) (JUMPER) Jurnal Elektrik EDUCATIONE: Journal of Education Research and Review
Herotje Siwi
Politeknik Negeri Manado
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering 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 Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences

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Analisis Potensi Energi Surya Untuk Alat Bioteknologi Penghasil Nata De Coco Dengan Memanfaatkan Limbah Air Kelapa Dion Brian Hatimanis; Stieven N. Rumokoy; Christopel H. Simanjuntak; Maureen Langie; Daisy D. G. Pangemanan; Herotje Siwi; Fridly Manawan
Jurnal Elektrik Vol. 3 No. 2 (2024): Vol.3 No.2 1 Desember 2024
Publisher : Jurusan Teknik Elektro - Politeknik Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65485/elektrik.v3i2.1029

Abstract

Coconut water (Cocos nucifera. L) has the potential to become a useful nata de coco product by utilizing biotechnology tools. Research conducted on "Analysis of Solar Energy Potential for Biotechnology Tools to Produce Nata de Coco by Utilizing Coconut Water Waste in North Sulawesi". The objectives of the research are as follows : to analyze the potential of solar energy for biotechnology tools to produce nata de coco by utilizing waste coconut water. The research method used by the author uses research and development (R&D) methods. It is a method or step in creating new products or developing and improving existing products and is used to test product effectiveness. This research can utilize discarded coconut water and can also develop biotechnological tools to produce nata de coco. The results of this research can be an illustration and input for readers regarding the factors of using solar energy for biotechnology tools to produce nata de coco using coconut water waste. The measurement results obtained are the average intensity value received by solar sell which is 146056 lux. So the average value of voltage consumption is: 12.21 volts, current: 22.45 amperes, power: 290 watts.
Determinants of Construction Workers’ Safety Performance: Examining the Effects of K3 Implementation, Safety Training, Safety Leadership, and Work Discipline Herotje Siwi; Jedithjah Naapia Tamedi Papia; Franciscus Josep Tulung; Meike Negawati Kesek
Journal Management & Economics Review (JUMPER) Vol. 4 No. 1 (2026): July
Publisher : Malaqbi Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59971/jumper.v4i1.1231

Abstract

The construction project is a risky undertaking that involves exposure to several types of occupational hazards. Consequently, it is necessary to improve the safety performance of construction workers to ensure successful completion of the project and reduce risk at the workplace. This study will analyze the factors affecting safety performance by looking at the impact of K3, safety training, safety leadership, and work discipline on safety performance. A quantitative explanatory research approach was applied in this study, whereby a sample of 150 construction workers was identified via survey technique. Data collection was carried out using structured questionnaires rated on a five-point Likert scale and analyzed using multiple linear regression with SPSS software. The results reveal that K3 implementation, safety training, safety leadership, and work discipline have a positive and significant impact on safety performance. Out of all four variables, work discipline affects safety performance the most, followed by safety leadership, K3 implementation, and safety training. In this respect, the model has an explanatory power of 67.9%.
The Influence of Air Cavity Dimensions and Shape in Briquettes on Their Heat Transfer Capability Paul M. Rumagit; Herotje Siwi; Tammy T.V. Pangow; Fransiscus J. Tulung; Alfred Noufie Mekel
Journal of Applied Mechanical Engineering and Renewable Energy Vol 6 No 1 (2026)
Publisher : Indonesian Society of Applied Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/jamere.v6i1.1657

Abstract

Bahan Bakar alternatif dari Biomasa berbentuk Briket adalah merupakan salah satu solusi yang dapat diandalkan, di bumi Indonesia Biomasa masih sangat berlimpah yang dapat digunakan untuk kesejahteraan rakyak banyak sebagai bahan bakar, selain itu kapasitas panas yang dihasilkan tidak kalah dengan bahan-bahan bakar lainnya dan cara pembuatannya juga tidak terlalu rumit. Penelitian ini adalah bertujuan mencari tahu seberapa cepat kemampuan panas yang dihantarkan oleh briket yang diberikan saluran udara dari bahan yang dipadu antara arang tempurung dengan tempurung kelapa. Variasi saluran udara ada tiga model ; f 20 mm, f 31mm dan f 10x4 mm dengan paduan arang 200 : 50 tempurung dan arang 200 : 25 tempurung, menggunakan perekat tepung kanji. Model II Briket B adalah briket yang mempunyai kemampuan hantar panas terbaik dengan waktu 12 menit untuk mendidihkan air 1 liter, serta efisiensi penyalaan dari briketnya 78%.
Evaluation Of K3 Management And Risk Analysis In The Factory Environment Herotje Siwi; Jedithjah Naapia Tamedi Papia; Meike Negawati Kesek
International Journal of Artificial Intelligence Research Vol 10, No 1 (2026)
Publisher : Universitas Dharma Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29099/ijair.v10i1.1732

Abstract

This study aims to evaluate the implementation of K3 management and analyze the level of occupational risk in a manufacturing plant. The implementation of an K3 management system is a crucial aspect in maintaining worker safety, increasing productivity, and minimizing the potential for workplace accidents that could harm both the company and workers. The study used a descriptive quantitative approach, employing field observations, interviews, documentation, and questionnaires distributed to 150 respondents, including production operators, technical staff, and factory supervisors. Risk analysis was conducted using the Hazard Identification, Risk Assessment, and Risk Control (HIRARC) method to identify potential hazards and determine the level of risk for each work activity.The results indicate that the implementation of K3 management in the factory environment has been quite successful. However, several weaknesses remain in the supervision of personal protective equipment (PPE) use, compliance with work procedures, and risk control of production machinery. Based on the hazard identification results, several dominant risks with high levels of risk were identified, namely noise exposure, accidents caused by production machinery, potential fires, and fatigue due to excessive workload. The evaluation revealed that the lack of regular training and low worker awareness were the main factors affecting the effectiveness of K3 implementation.This study also found that the implementation of administrative and technical risk controls can significantly reduce the potential for workplace accidents if implemented consistently. Furthermore, company management involvement in routine monitoring and evaluation is a crucial factor in improving occupational safety culture in industrial environments. This study recommends improving K3 training programs, strengthening monitoring systems, and optimizing the implementation of standard operating procedures (SOPs) to minimize occupational risks in the factory environment. With effective implementation of K3 management, companies can create a safe, healthy, and productive work environment for all workers.
PROGRAMMABLE CONTROLLER AND HUMAN-MACHINE INTERFACE RETROFIT FOR SHEET-METAL CUTTING CONTROL Rick Resa Wahani; Michael Edward Gregerio Kimbal; Moody Noldy Tumembow; Priyono; Herotje Siwi
EDUCATIONE Volume 4, Issue 2, July 2026
Publisher : CV. TOTUS TUUS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59397/edu.v4i2.278

Abstract

A 1995 Colgar sheet-metal cutting machine used in the Manufacturing Laboratory of Politeknik Negeri Manado experienced degraded cutting performance, a disabled automatic cycle, an unreliable safety function, and a non-functional blade-gap adjustment mechanism. This study aimed to retrofit the machine control system by integrating a programmable logic controller, a human-machine interface, limit sensors, a variable-frequency drive, and interlock-based emergency logic. The study used a research-and-development design combined with experimental validation. Data were collected through machine inspection, input-output mapping, ladder-diagram programming, HMI screen development, electrical installation, and functional testing with 2 mm and 6 mm steel plates. The retrofit restored manual and automatic blade movement, reactivated the worktable/blade-gap mechanism, enabled operator monitoring through HMI screens, and improved safety through upper and lower limit sensors, emergency stop logic, visual indicators, and audible alarms. Post-retrofit tests showed that the blade-gap setting operated normally, with a 0.35 mm gap for 2 mm steel plates and a 0.75 mm gap for 6 mm steel plates. The machine could perform a complete automatic down-and-up cycle through a single command while retaining full manual control. The findings indicate that PLC-HMI retrofitting is a practical modernization strategy for legacy sheet-metal machines because it improves functionality, operational accuracy, usability, and machine safety without replacing the main mechanical structure.
The Effect of Sodium Hydroxide (NaOH) Mass on the Performance of a Fuel Cell as an Energy Source for a Prime Mover Engine Exel Lirio Gorung; Simon Simanjuntak; Jedithjah Naapia Tamedi Papia; Nelson Seleman Luppa; Herotje Siwi
Journal of Social Research Vol. 5 No. 9 (2026): Journal of Social Research
Publisher : International Journal Labs (AHU-0028405-AH.01.14 Tahun 2022)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v5i9.3321

Abstract

The integration of hydrogen-based fuel cell technology as a supplementary energy source for internal combustion engines has gained increasing attention as a strategy to improve fuel efficiency and engine performance. This research investigated the effect of sodium hydroxide (NaOH) mass on the performance of an alkaline electrolysis cell used as a supplementary energy source for a gasoline-powered prime mover engine. An electrolysis cell was assembled using stainless steel electrodes immersed in an aqueous NaOH electrolyte solution to generate hydrogen and oxygen gases (oxyhydrogen or HHO), which were introduced into the engine air intake. Three experimental configurations were tested: (1) 15 g of NaOH with a 5 Ah battery at an engine speed of 2000 RPM; (2) 15 g of NaOH with a 7 Ah battery at 3000 RPM; and (3) 10 g of NaOH with a 5 Ah battery at 4000 RPM. Each configuration used 75 mL of Pertalite gasoline and 150 mL of distilled water. Baseline measurements were obtained under identical operating conditions without fuel cell integration. The results indicated that fuel cell integration extended engine operating time across all RPM settings, with an improvement of up to 52.5% at 4000 RPM, while maintaining comparable average engine speeds. The highest deviation in mean RPM compared with the baseline condition was +14.66 RPM (+0.51%), observed at 3000 RPM using 15 g of NaOH and a 7 Ah battery, indicating a slight improvement in combustion performance. These findings demonstrated that NaOH mass and battery capacity jointly influenced the HHO production rate and, consequently, affected engine performance and fuel consumption characteristics.
DESIGN OF A DIGITAL DISPLAY SYSTEM FOR MONITORING RADIATOR TEMPERATURE ON FOUR-WHEELED VEHICLES I Made Wely Prayoga; Yanse Arfinando Janis; Jedithjah Naapia Tamedi Papia; Herotje Siwi; Tammy Tinny Veisy Pangow
EDUCATIONE Volume 4, Issue 2, July 2026
Publisher : CV. TOTUS TUUS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59397/edu.v4i2.284

Abstract

Engine overheating can develop when radiator coolant temperature is not monitored adequately, while conventional dashboard indicators may provide limited numerical information. This study designed and evaluated an Arduino Uno-based digital display prototype for monitoring radiator coolant temperature in four-wheeled vehicles. The system integrated a DS18B20 temperature sensor, Arduino Uno, TM1637 driver, 3-digit 7-segment display, buzzer, and regulated power supply. Evaluation consisted of a three-point comparison against a digital thermometer and vehicle-scenario observations under idling, normal driving, and traffic-jam conditions with the air conditioning on. At reference temperatures of 30, 40, and 50°C, the sensor differed from the reference by 0–1°C, giving a mean absolute error of 0.33°C and a mean absolute percentage error of approximately 0.83%. Vehicle observations covered 32–94°C; the audible alarm remained inactive at 94°C because the programmed threshold was above 95°C. The findings demonstrate proof-of-concept feasibility for direct numerical coolant-temperature display under the reported conditions. However, the evidence does not establish universal vehicle applicability or superiority to factory indicators. Multi-vehicle calibration, repeated trials, quantitative response-time measurement, and durability testing are required before broader deployment.
Co-Authors Alfred Noufie Mekel Daisy D. G. Pangemanan Dion Brian Hatimanis Exel Lirio Gorung Franciscus Josep Tulung Fransiscus J. Tulung Fridly Manawan I Made Wely Prayoga Jedithjah Naapia Tamedi Papia Maureen Langie Meike Negawati Kesek Michael Edward Gregerio Kimbal Moody Noldy Tumembow Nelson Seleman Luppa Paul M. Rumagit Priyono Rick Resa Wahani Simanjuntak, Christopel Hamonangan Simon Simanjuntak Stieven N. Rumokoy Tammy T.V. Pangow Tammy Tinny Veisy Pangow Yanse Arfinando Janis