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Alfian Qomaruddin
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INDONESIA
REKAYASA
Published by Universitas Trunojoyo Madura
ISSN : 02169495     EISSN : 25025325     DOI : https://doi.org/10.21107/rekayasa
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Physics
This journal encompasses original research articles, review articles, and short communications, including: Science and Technology, In the the next year publication, Rekayasa will publish in two times issues: April and Oktober.
Arjuna Subject : -
Articles 517 Documents
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Analisis Kecenderungan Musiman Tinggi Gelombang Signifikan di Laut Indonesia Tahun 1980-2020 Untuk Mendukung Pembangunan Pesisir Berkelanjutan Fahmi, Muhammad Baharudin; Wirayuhanto, Harish; Dwito Armono, Haryo; Zikra, Muhammad; Lorentius, Suratno
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.29978

Abstract

Sea level rise, as one of the consequences of global climate change, has significantly impacted oceanographic dynamics, particularly wave characteristics. One of the most critical affected parameters is significant wave height, which directly influences maritime safety, the sustainability of fisheries, the stability of coastal infrastructure, and the risk of coastal erosion and tidal flooding. As an archipelagic nation with the second-longest coastline in the world, Indonesia is highly vulnerable to such changes. Therefore, understanding the spatial and temporal trends in significant wave height is essential to support effective adaptation and mitigation policies in coastal regions. This study aims to analyze the trend of increasing significant wave height in Indonesian waters using ERA5 reanalysis data from the European Centre for Medium-Range Weather Forecasts (ECMWF) over the period from 1980 to 2020. The trend analysis was conducted using non-parametric statistical methods, namely the Mann-Kendall test to detect statistically significant trends and Sen’s Slope Estimator to quantify the rate of change. A significance level of 0.05 was applied in the analysis. The results indicate a significant upward trend in significant wave height across several Indonesian maritime regions. Conversely, the northern waters of Central Java and the northern region of Masalembu Island exhibited no statistically significant trend across seasons. The Banda Sea and southern Papua experienced significant increases during the dry season (JJA) and the second transitional season (SON), with a peak rate of 1.70 cm/year. In the southern waters of Lombok Island, positive trends were observed in the wet season (DJF) and the first transitional season (MAM), with rates reaching 1.46 cm/year. The highest trend was recorded in the southern waters of Java during the wet season (DJF), at 1.72 cm/year. These findings suggest that most Indonesian waters are experiencing significant changes in wave characteristics as a result of climate change, highlighting the urgency for long-term oceanographic monitoring and the integration of wave data into coastal development and climate adaptation strategies.
Analisis Efektivitas Fitoremediasi Berbasis Tanaman Hias pada Konsentrasi Formaldehida Dalam Ruangan untuk Meningkatkan Health and Safety Pekerja Inas, Bilqis Hanifah; Dewi, Ratna Sari
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.31243

Abstract

Indoor air quality is a crucial factor that directly impacts worker safety and health (K3), where exposure to hazardous pollutants such as formaldehyde can trigger irritation, respiratory disorders, and long-term health risks. Based on this issue, this study aims to analyze in depth the effectiveness of a phytoremediation strategy using ornamental plants in reducing formaldehyde concentrations in office workspace environments. To achieve this goal, sophisticated simulations were conducted using Computational Fluid Dynamics (CFD) methods through the SimScale platform. Four main intervention scenarios were modeled in detail: (1) a control condition with no intervention, (2) the use of mechanical ventilation alone, (3) ornamental plant intervention alone, and (4) a synergistic combination of ventilation and plants. In this simulation, formaldehyde emissions were assumed to originate from the work desk material, while the ornamental plant Ficus benjamina acted as a passive absorbing agent. The simulation results showed that the combination of ventilation and plants was the most superior strategy, capable of drastically reducing formaldehyde concentrations by up to 99.8% in just one hour. Meanwhile, plant intervention alone also made a significant contribution with a reduction of 46%. Further statistical analysis using multiple linear regression and ANOVA confirmed that all interventions had highly significant effects (p 0.05). Furthermore, it was revealed that plant placement influenced absorption effectiveness, with positions closer to the emission source showing better absorption. These findings emphasize the importance of an integrated strategy between plant arrangement and ventilation engineering to create a healthy, safe, and productive work environment.  
My Wondering “Are EFL Excited Learning toward Interactive Media?” The Perception Study from EFL Bandono, Adi; Kurniati, Fadhika; Wati, Sundari; Rahmawati, Yuliana; Maulifah, Umul; Purwaningsih, Elis Dwi; Winarni, Winarni
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.30994

Abstract

Interactive Learning Multimedia is a technological tool that can be effectively utilized as a learning resource. This type of media not only supports the instructional process but also contributes positively to students' learning outcomes. The use of digital platforms enables teachers to express their creativity and tailor their teaching approaches to align with students' learning styles and interests. Implementing Google Sites as a platform for delivering interactive multimedia facilitates more effective learning and enhances students’ understanding of the material. This study aims to describe students’ perceptions of learning procedural texts through Interactive Learning Multimedia based on Google Sites. A qualitative approach with a phenomenological design was employed. Data were gathered through observations of students’ active participation and motivation, along with reflection sheets covering their perceptions, understanding, and evaluations of the media. Data analysis was conducted from the outset of data collection, involving reduction, presentation, and conclusion drawing. The findings revealed that students held highly positive perceptions toward the use of interactive media. They reported feeling happy, interested, and motivated while learning procedural texts through this medium.
Status Terkini Kondisi Ekosistem Terumbu Karang di Pulau Saobi dan Pulau Sapapan, Kepulauan Kangean, Sumenep Handoko, Ahmad; Saptarini, Dian; Irawan, Dedi
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.26076

Abstract

Coral reefs are marine biota that have a fairly high level of sensitivity to changes in water conditions, both in terms of physical and chemical aspects. Damage experienced by coral reef ecosystems is increasingly occurring, this can be caused by human and natural activities. This research aims to determine the condition of the coral reef ecosystem on Saobi Island and Sapapan Island. The method used in this research is Underwater Photo Transect (UPT). The observation location consists of 7 stations, of which 4 stations are on Saobi Island and 3 stations are on Sapapan Island. The growth forms found are Acropora Branching (ACB), Acropora Digitate (ACD), Acropora Submassive (ACS), Acropora Tabulate (ACT), Coral Branching (CB), Coral Encrusting (CE), Coral Foliose (CF), Coral Massive (CM), Coral Mushroom (CMR), Coral Submassive (CS). The condition of the coral on Sapapan Island is included in the good category at station 1 with a live coral cover percentage of 53.67% and in the very good category at station 2 and station 3 with a live coral cover percentage of 78.87% and 77.80%. Meanwhile, on Saobi Island, the condition of coral reefs at station 1 is included in the medium category with a percent cover value of 46.53% and station 2 is 67.53%, station 3 is 65.33% and station 4 is 52.47% which is included in good category.
Analisis Life Cycle Assessment untuk Pengembangan Pariwisata Berbasis Teknologi Produk Gula Aren Menuju Wisata Kuliner Berkelanjutan di Kabupaten Sumbawa Barat Risma, Gita Adita; Azzumardi, Nispi; Efendi, Junaidi
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.30819

Abstract

Penelitian ini bertujuan untuk mengintegrasikan pendekatan Life Cycle Assessment (LCA) dengan pengembangan agrowisata berbasis teknologi, guna mendorong pembangunan wisata kuliner berkelanjutan di Kabupaten Sumbawa Barat, khususnya pada produk gula aren. Pendekatan penelitian dilakukan dengan penerapan LCA untuk menilai dampak lingkungan dari produksi gula aren, meliputi jejak karbon, efisiensi energi, dan emisi limbah. Hasil analisis kemudian diintegrasikan ke dalam media edukasi berupa digital platform, infografik, dan papan informasi di lokasi wisata. Studi ini mengambil objek di Desa Mataiyang, Kabupaten Sumbawa Barat, yang memiliki jumlah pohon aren terbanyak di wilayah tersebut. Hasil penelitian menunjukkan bahwa integrasi LCA dalam agrowisata dapat meningkatkan kesadaran wisatawan terhadap keberlanjutan proses produksi gula aren. Selain itu, penelitian ini juga memberdayakan masyarakat lokal sebagai pelaku edukasi, sekaligus membuka peluang pengembangan sektor UMKM dan pariwisata berbasis saintek. Inovasi penelitian ini terletak pada penggabungan metode LCA dengan konsep agrowisata, di mana hasil analisis lingkungan tidak hanya menjadi bahan evaluasi, tetapi juga diolah menjadi sarana edukasi interaktif bagi wisatawan. Model ini menawarkan pendekatan baru dalam pengembangan desa wisata yang berfokus tidak hanya pada produk akhir, tetapi juga pada proses produksi yang ramah lingkungan dan informatif.
Risk Analysis in the Construction Industry Using Project Management Life Cycle and House of Risk Hidayat, Ananda Syalsabila; Gunarta, I Ketut
Rekayasa Vol 18, No 2: Agustus, 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i2.30820

Abstract

This study aims to identify risks arising in housing construction projects, particularly those related to budget overruns, and to develop mitigation strategies to ensure that projects run according to plan in terms of cost, time, and resources. The methods used are the Project Management Life Cycle (PMLC) to map the project stages from initiation to closure, and the House of Risk (HoR) to identify risk events and risk agents. The novelty of this study lies in the development of difficulty analysis in HoR, which focuses on three main aspects —cost, time, and resources — that have not been explicitly described in previous studies. The results show that the project experienced a cost increase from IDR 150 million to IDR 165 million due to dominant risks, including misinterpretation of design drawings, fluctuations in material prices, and work delays. Through HoR analysis, priority risks were successfully identified, and mitigation strategies were developed in the form of team training to improve design understanding, control of material usage, and the implementation of contingency planning. This research contributes academically by modifying the HoR method with difficulty analysis based on cost, time, and resources, and integrating it with PMLC. It also provides practical guidance to contractors and project managers on anticipating and managing risks more effectively, thereby improving cost efficiency, timeliness, and resource optimization in housing construction projects.
Sensitivity Analysis of Digital Elevation Model In The Use of Hydrological Applications Sahid, Sahid; Ihsan, Haikal Muhammad; Saefulloh, Muhammad Abia; Ulhaq, Wiedad Diya
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22449

Abstract

Assessing DEMs is a critical step in hydrological applications to reduce uncertainties. This study assesses the uncertainty level of using several DEM products by comparing the derivation of watershed morphometric information in the form of hydrological boundaries, river flow networks, and meeting points between river networks. This research assessed three DEM products, namely SRTM, ASTER GDEM, and NASADEM, with the topographic map as reference data for product assessment. The evaluation is based on two criteria: DEM product assessment and morphometric extraction. The second criterion assessment compared river morphometry products from several parameters, including watershed area, river network density, and river network meetings. The analysis results showed that in the first criterion, the NASADEM product was the product with the closest RMSE and PBIAS values to the reference data. Further assessment of river morphometry products shows that the ASTER GDEM watershed area parameter has the closest area value. In the horizontal accuracy parameter of river network products, NASADEM has the smallest average error value. Furthermore, in the accuracy assessment in determining the meeting between tributaries and the main river and the density of river flow, SRTM is the closest compared to other DEM products. The vertical and horizontal accuracy of DEM must be considered before using in hydrologic applications.
Efektivitas Pengayaan Daphnia sp. dengan Viterna Untuk Post Larva Ikan Papuyu (Anabas testudineus Bloch) Siswanto, Siswanto; Aminah, Siti; Sofarini, Dini; Nopitasari, Nopitasari
Rekayasa Vol 16, No 3: Desember 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i3.22445

Abstract

In the development of climbing perch cultivation, there are several factors that are still obstacles, namely, slow growth and low survival, especially in the critical period phase, namely the post-larval phase. The aim of this research was to analyze the effectiveness of giving Daphnia sp with viterna enrichment on the survival and growth of climbing perch post-larval. Proximate analysis was carried out at the end of the research to see the nutritional content of the enriched Daphnia sp. Sampling was carried out at the beginning and end of the study with a maintenance period of 30 days. During rearing the larvae were given Daphnia sp 2 times a day. This study used RAL for 4 treatments and 3 repetitions, namely: treatment A (control), B (viterna enrichment 10 ml/l), C (viterna enrichment 20 ml/l) and treatment D (viterna enrichment 30 ml/l). The proximate test results showed that treatment B produced the highest protein content, namely 59.61%, while the control treatment was 49.45%. Survival rates range between 76-88%. Relative weight growth ranged between 214.41-524.69% while relative length ranged between 29.24-59.62%. Treatment B produced the best relative growth in weight and length but was not statistically significantly different from the other treatments. Treatment D produced the best survival but after statistical tests it was not significantly different between treatments.
Rancang Bangun dan Pengujian Prototype Hybrid Solar Dryer Jamaldi, Agus; Budi Raharjo, Emanuel; Surwono, Edi; Yordan Santoso, Lewi; Catur Prasojo, Ryan
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22673

Abstract

This study aims to test the prototype solar dryer using a hybrid drying mechanism. The study utilized direct and indirect drying models. The indirect drying used solar collectors. Solar collector serves to absorb heat captured by the black body inside. The solar collector media used are flat plates and corrugated plates. The hot air from the solar collector is blown and forced by the blower into the drying chamber. Blowers operate using electrical energy generated by solar panels. The experiment lasted for two days from 09.00 a.m. to 03.00 p.m. The observations focused on the temperature of the solar collector and the drying chamber as well as the output of electricity generated by the solar panels. The test results showed the highest temperature reached by the solar collector with a corrugated plate was 50.500C, while the flat plate was 49.600C. Furthermore, the highest electrical power produced by solar panel was 11.33 Watts.
Pengembangan Aplikasi Pendataan Komplain Warga Berbasis Android (Studi Kasus : Desa Babadan, Bantul) Pratama, Khrisna Yudha; Wibowo, Adityo Permana
Rekayasa Vol 16, No 3: Desember 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i3.19989

Abstract

Complaints are quite an important thing in a village community services, with the submission of complaints, allows community administrators to improve the quality of the village and solve many common problems. A slow response in handling complaints can give a bad image to the village administrators. Babadan Village is one of the villages in Bantul Regency, Yogyakarta. In this village, complaints are sent by the villagers by contacting the head of the village through the social media WhatsApp. However, over time this method is no longer considered effective, and causes a lack of responsiveness in handling complaints. Therefore, through the development of this application, it can hopefully facilitate the villagers in submitting complaints to the administrator and can also make the administrator faster in handling complaint reports from its villagers. The systems planning begins with analyzing the current system, prototyping, testing, and then ends with implementation. Then the development method of android mobile-based applications will be done by applying the RESTful API Technology.  Based on the results given from this study, the application was able to function in line with the objectives that have been described.

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