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INDONESIA
Jurnal Penelitian Sekolah Tinggi Transportasi Darat
Published by Politeknik Transportasi Darat Indonesia STTD
ISSN : 20866569     EISSN : 2776351X     DOI : -
Core Subject : Engineering,
Automotive Engineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Penelitian Sekolah Tinggi Transportasi Darat adalah jurnal Ilmiah yang diterbitkan dua kali setahun (Juni dan Desember) oleh Politeknik Transportasi Darat Indonesia- STTD. Artikel yang dimuat di jurnal ini merupakan artikel dengan topik penelitian dan kajian Transportasi Darat. Selain Sebagai wadah Komunikasi Ilmiah Penerbitan jurnal ini bertujuan untuk menyebar luaskan hasil hasil penelitian yang berkaitan dengan bidang ilmu transportasi dan sumber daya manusia di bidang transportasi darat serta pengembangan Politeknik Transportasi Darat Indonesia- STTD. Jurnal Penelitian Sekolah Tinggi Transportasi Darat telah terdaftar pada International Standard Serial Number (ISSN: 2086-6569 & e-ISSN: 2776-351X)
Arjuna Subject : Teknik (semua kategori) - Teknik Otomotif
Articles 183 Documents
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Design And Construction Of A Thermoelectric Generator-Based Power System Utilizing Exhaust Manifold Heat And Fuel Flow As Cooling Medium Yogie Wijaya; Setya Wijayanta; Femmy Sofie Schouten
Jurnal Penelitian Sekolah Tinggi Transportasi Darat Vol 17 No 1 (2026): Juni 2026
Publisher : Politeknik Transportasi Darat Indonesia - STTD Bekasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55511/jpsttd.v17i1.782

Abstract

Internal combustion engines dissipate approximately 50 percent of the energy produced through the exhaust system, representing a significant source of untapped thermal energy. This study presents the design, construction, and experimental evaluation of a Thermoelectric Generator (TEG) based power generation system that simultaneously harnesses heat from the exhaust manifold of a four stroke gasoline motorcycle engine and utilizes circulating fuel flow as the cooling medium on the cold side of the TEG modules. Ten SP1848 TEG modules were integrated onto a custom fabricated exhaust manifold and connected in series and parallel configurations. Three fuel flow rates were investigated, namely 0.59, 0.78, and 1.44 L/min, controlled by a DC pump regulated through an adjustable potentiometer. Temperature data from both sides of each module were acquired using ten Type K thermocouples interfaced with an ESP32 microcontroller. Electrical output was measured using a calibrated watt meter with a fixed 10 ohm resistive load. Results demonstrate that the series configuration achieves superior power output, with a peak of 1.03 W at a fuel flow rate of 1.44 L/min and a maximum hot side temperature of 98.10 C. The parallel configuration, conversely, generates higher power at the lowest flow rate of 0.59 L/min with an output of 0.61 W, driven by an increased temperature difference. A positive linear relationship (R2 = 0.80) between temperature difference and output power is confirmed for the series circuit. These findings demonstrate that dual utilization of exhaust heat and fuel cooled heat exchange represents an effective and practical strategy for auxiliary power generation in conventional vehicles, offering significant implications for energy efficiency and waste heat recovery technology.
Human Resource Development Strategy And Multimodal Transportation Performance: The Mediating Role Of Digital Competence In Ferry Transportation Services Surnata, Surnata; Eko Nugroho Widjatmoko; Rispa Saeful Mu’tamar; Febriansyah
Jurnal Penelitian Sekolah Tinggi Transportasi Darat Vol 17 No 1 (2026): Juni 2026
Publisher : Politeknik Transportasi Darat Indonesia - STTD Bekasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55511/jpsttd.v17i1.802

Abstract

This study examines the effect of Human Resource Development (HRD) strategies on multimodal transportation performance in the Tanjung Api-Api ferry transportation sector, with employees’ digital competence acting as a mediating variable. The study contributes to the literature by proposing and empirically validating an integrated model linking HRD strategy, digital competence, and multimodal transportation performance in the ferry transportation sector, a context that has received limited empirical investigation. A quantitative approach with an explanatory research design was employed using the Structural Equation Modeling–Partial Least Squares (SEM-PLS) method. Data were collected from 185 operational employees and multimodal transportation service personnel. The findings reveal that HRD strategies positively and significantly influence both employees’ digital competence and multimodal transportation performance. Employees’ digital competence also significantly enhances service efficiency, operational productivity, service quality, and intermodal coordination. Furthermore, digital competence significantly mediates the relationship between HRD strategies and transportation performance. The coefficient of determination (R²) value of 0.742 indicates that the model has strong predictive power. These findings extend existing knowledge by demonstrating the critical role of digital competence as a mechanism through which HRD strategies improve transportation performance. Practically, the results provide guidance for transportation operators and policymakers in designing digital competency-based HRD programs to support the effectiveness, efficiency, and sustainability of multimodal transportation systems in the era of digital transformation.
Determinants Of Traffic Accident Occurrence Based On Road User Perceptions On The Rantepao-Pasar Bolu Corridor Memed Timang Palembangan; Yulius Pakiding
Jurnal Penelitian Sekolah Tinggi Transportasi Darat Vol 16 No 2 (2025): December 2025
Publisher : Politeknik Transportasi Darat Indonesia - STTD Bekasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55511/jpsttd.v16i2.844

Abstract

Traffic accidents remain a major challenge to transportation safety despite continuous improvements in road infrastructure. This study examined the determinants of traffic accident experience based on road users' perceptions of road safety along the Rantepao-Pasar Bolu corridor, North Toraja Regency, Indonesia. A quantitative survey was conducted with 60 respondents selected through accidental sampling. The study evaluated four perception variables: road surface condition, traffic signs and pavement markings, street lighting, and road user compliance. The questionnaire demonstrated acceptable validity (corrected item-total correlation = 0.49 - 0.66) and reliability (Cronbach's Alpha = 0.75). Data were analysed using descriptive statistics and binary logistic regression, while model performance was assessed using Nagelkerke R^2 and Receiver Operating Characteristic (ROC) analysis. The results showed that road surface condition received the highest mean score (4.15), whereas street lighting received the lowest (2.60). Street lighting was the only variable significantly associated with traffic accident experience (B = -1.353, p = 0.027, {Exp}(B) = 0.258$), indicating that improved lighting reduced the likelihood of experiencing a traffic accident. The model explained 15.6% of the variation in accident experience (Nagelkerke R^2 = 0.156) and achieved acceptable discrimination ({AUC} = 0.714). These findings highlight the importance of improving street lighting to enhance road safety. Future research should include larger samples and additional explanatory variables to improve model performance.

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