Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Impression : Jurnal Teknologi dan Informasi CONSISTAN : Jurnal Tadris Matematika
Dirhamsyah
Politeknik Pelayaran Surabaya
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Mathematics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Item Analysis of an Adaptive Assessment Question Bank in Maritime Vocational Education Tika Septia; Dirhamsyah; Tanti Diyah Rahmawati; Rezky Rahma Ruslan
CONSISTAN (Jurnal Tadris Matematika) Vol 4 No 01 (2026): Consistan : Jurnal Tadris Matematika
Publisher : Program Studi Tadris Matematika Fakultas Tarbiyah Institut Agama Islam Al-Qolam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35897/consistan.v4i01.2641

Abstract

Adaptive assessment systems depend on question banks whose difficulty rises in a credible way and whose items can distinguish learner performance. This study reports the design and validation of a 90-item question bank for adaptive learning in maritime mathematics at Politeknik Pelayaran Surabaya. The bank covered six STCW-aligned topics (speed-distance-time, ETA calculation, compass correction, great circle navigation, tidal height, altitude correction), arranged them across three progressive difficulty levels, and linked them to an AI-tutor system using a 2-up/2-down adaptive staircase algorithm. Validation had two parts. The maritime mathematics curriculum committee first conducted an expert pedagogical audit with a rubric covering curriculum alignment, difficulty progression, answer correctness, and linguistic clarity. Simulated pilot testing with synthetic learner profiles was then used to check whether the adaptive engine behaved as expected. In that audit, 15 of 90 items needed revision, mainly for clarity and difficulty calibration, while 75 were retained without modification. After revision, the bank still showed a balanced spread across topics and difficulty levels and maintained appropriate content validity. Simulation results likewise confirmed the intended pattern: difficulty shifted only after two consecutive correct or incorrect responses. For that reason, expert review paired with simulation offers a workable validation route for adaptive assessment systems in specialized vocational education contexts, especially when large-scale learner pilot testing is not yet feasible.
Analisis Tidak Optimalnya Kinerja Aeration Blower Pada Sewage Treatment Plant Type SBT-40 di MV. Muhasyir Bagus Purwo Samudra; Dirhamsyah; Elly Kusumawati; Antonius Edy Kristiyono; Agus Prawoto
Impression : Jurnal Teknologi dan Informasi Vol. 4 No. 2 (2025): July 2025
Publisher : Lembaga Riset Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59086/jti.v4i2.941

Abstract

Pelayaran memiliki peran vital dalam sejarah, ekonomi, dan lingkungan, khususnya di negara kepulauan seperti Indonesia. Salah satu aspek penting dalam pengoperasian kapal modern adalah pengolahan limbah melalui Sewage Treatment Plant (STP), di mana aeration blower berfungsi menyediakan oksigen bagi bakteri aerob yang menguraikan limbah. Penelitian ini menganalisis ketidakoptimalan kinerja aeration blower pada STP tipe SBT-40 di kapal MV. Muhasyir. Penurunan tekanan udara dari 0,02 MPa menjadi 0,008 MPa menyebabkan bau tidak sedap dan gangguan proses biodegradasi. Metode penelitian meliputi observasi, wawancara, studi dokumentasi, dan tinjauan pustaka. Hasil menunjukkan kerusakan pada rotor dan bearing blower akibat kurangnya perawatan berkala dan pelaksanaan Planned Maintenance System (PMS) yang tidak konsisten. Faktor penyebab dianalisis menggunakan diagram fishbone, mencakup aspek manusia, mesin, metode, material, lingkungan, dan pengukuran. Solusi yang diusulkan meliputi pelatihan teknis, inspeksi rutin, penggantian komponen aus, serta pemasangan sensor tekanan dan getaran. Penelitian ini menekankan pentingnya perawatan preventif dan sistem monitoring untuk menjaga efektivitas STP dalam mendukung pelayaran ramah lingkungan.   Shipping has a vital role in history, economy, and the environment, especially in an archipelagic country like Indonesia. One of the important aspects of modern ship operation is the treatment of waste through the Sewage Treatment Plant (STP), where the aeration blower functions to provide oxygen for aerobic bacteria that decompose waste. This study analyzes the non-optimal performance of aeration blower in SBT-40 type STP on MV ships. Muhasyir. A decrease in air pressure from 0.02 MPa to 0.008 MPa causes unpleasant odors and disruption of the biodegradation process. The research methods include observation, interviews, documentation studies, and literature reviews. The results showed damage to the rotor and blower bearings due to lack of periodic maintenance and inconsistent implementation of the Planned Maintenance System (PMS). The causative factors were analyzed using fishbone diagrams, including human, machine, method, material, environmental, and measurement aspects. The proposed solution includes technical training, regular inspections, replacement of wear components, and installation of pressure and vibration sensors. This study emphasizes the importance of preventive maintenance and monitoring systems to maintain the effectiveness of STPs in supporting environmentally friendly shipping.  
Co-Authors Agus Prawoto Antonius Edy Kristiyono Bagus Purwo Samudra Elly Kusumawati Rezky Rahma Ruslan Tanti Diyah Rahmawati Tika Septia