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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.
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Articles 18 Documents
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Search results for , issue "Vol 17, No 1: April, 2024" : 18 Documents clear
Perancangan Alat Pengukur Tinggi Badan dan Berat Badan untuk Penentuan Kondisi Gizi Bayi Ubaidillah, Achmad; Joni, Koko; Afif, Nasrul; Kholida, S. Ida
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.22360

Abstract

Nutrition is very important for the healthy and normal growth of babies. Determination of infant nutrition is usually calculated from two parameters, namely the baby's height and weight. Both data are then calculated manually to determine the nutritional condition of the baby. The process is considered relatively inefficient. Research is very important to overcome this problem, which will be made a measuring device for height and weight to determine the nutritional condition of babies automatically. This research uses a camera to measure height and a strain gauge sensor to measure weight. Both tools are integrated in a toddler box. The measurement data is then processed by the ATmega16 microcontroller and sent to a PC/laptop for evaluation, storage and appearance of the toddler's condition automatically on the database server. With this research, it is hoped that parents can monitor their baby's nutrition at any time easily and quickly. Based on experiments that have been carried out, measurement of height and weight for determining the nutritional status of infants using the canny detection method, has an average accuracy of 97.32%.
Shifting analysis of grain carriers using System Dynamics Simulation Ekawati, Ratna; Wahyuni, Nuraida; Anjani, Fitri
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.20886

Abstract

PT PFS is a subsidiary of PT BJ specially serving of port services. PT PFS need to shift FSO Ardjuna Sakti from jetty 1.6-1.7 to the new jetty (jetty 4.5-4.6) because PT PFS has some problems and activity plans. The problems are teh increased of commercial demand, the development jetty 3 of port CDG, the Berth Occupation Ratio (BOR) which already exceeds 65%, the expansion plan of PT BJ and the need for flexibility on the jetty 1.5-1.8. Therefore, it is necessary to do the analysis of shifting the FSO Ardjuna Sakti. The method use in this study is comparing the financial analysis using manual calculation and system dynamics simulation. The financial analysis uses in this study are Internal Rate of Return (IRR), Payback Period, Net Present Value (NPV) and comparing revenue and profit between FSO Ardjuna Sakti in jetty 1.6-17 and jetty 4.5-4.6. The result of the study showed that the IRR is 14,73%, it is exceed than the MARR of BI rate 6,5%, Payback Period is 5 years so investment will comeback at 5 next years, and the value of the NPV with manual and system dynamics simulation has both positive value or exceed than 0 (zero). The result of manual calculation of NPV is Rp.15.369.374.455 and the result of system dynamics simulation is Rp.1.184.863.983.489. Comparing manual calculation and system dynamics simulation of revenue and profit of FSO Ardjuna Sakti in jetty 1.6-1.7 respectively is Rp.2.384.292.880 and Rp.2.125719.660 whilst in jetty 4.5-4.6 respectively is Rp.9.015.993.344 and Rp.6.761.995.008. From those financial methods compared manually and by system dynamics simulation, we can conclude the investment decisions are feasible. And activity of shifting FSO Ardjuna Sakti from jetty 1.6-1.7 to the jetty 4.5-4.6 is appropriate to do. 
Convolutional Autoencoder for Reconstruction of Historical Document Images: Ancient Manuscript Babad Lombok Syuhada, Fahmi; Firdaus, Asno Azzawagama; Ni'mah, Ana Tsalitsatun; Sa’adatai, Yuan; Tajuddin, Muhammad
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.26101

Abstract

The Babad Lombok is an ancient literary or manuscripts document that generally contains stories about the origins of the people of Lombok. This document is written on a lontar leaf, which in the past was used to write manuscripts, letters, and documents. At present, the Babad Lombok document can be seen in the form of photos or scans, so it can be viewed without having to go to a museum or cultural heritage site where the document is usually exhibited. However, because this document is an ancient artifact that has been around for hundreds of years, it has naturally experienced fading in the original document or its scanned versions. This makes the text inside less clear. This paper proposes to automatically reconstruct/repair the Babad Lombok document using a neural network. The type of neural network used is an Autoencoder or Convolutional Autoencoder (CAE). The CAE model is built sequentially and trained using original images of Babad Lombok as its training data and manually corrected images of Babad Lombok as the target or ground truth data. In the process, the two types of data are iteratively cropped to a size of 64x64 along the original size of the Babad Lombok image. This process results in input and target data for the CAE training process in this research, each consisting of 48,288 images. Testing the trained autoencoder model shows that the Babad images have been successfully repaired, making the text quality clearer before reconstruction. Ultimately, the proposed CAE has achieved training and validation accuracies of 89.09% and 94.57%, with corresponding loss values of 0.0418 and 0.0226.
Karakteristik Mutu Garam Fungsional Tanaman Alur (Suaeda maritima) Berdasarkan Perbandingan Rasio Pelarut dan Tepung Alur Nabilah, Ana; Maflahah, Iffan; Supriyanto, Supriyanto; Asfan, Dian Farida
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.21689

Abstract

Seablite (Suaeda maritimea) is a plant that grows in salt marshes and furrow soil which is rich in vitamin A content. Seablite is one of the plants that can be used as functional raw materials. Functional salts are salts that have a low NaCl content (less than 50%). The purpose of this study was to determine the effect of the ratio of air and seablite flour on the quality of the functional salt of the seablite. The characteristics of the salt used were moisture content test, ash content, salinity test, NaCl test, and vitamin A test. Salt was prepared by air treatment and seablite t flour, namely 1:5, 1:10, 1:15 and 1: 20. The technique of making seablitefunctional salt is to start by dissolving the seablite flour with water as a solvent. Heating the solution for 10 minutes, filtering using a filter cloth, the resulting filtrate is then deposited for 3 days, the precipitate from the seablite flour solution is then dried for 3 days at a temperature of 65oC, finally weighing the material in the form of seablite plant salt. Based on the results of the quality characteristic research, the difference in the ratio of the solvent ratio to the seablite flour gives a significant difference to the quality characteristics of the functional salt of the seablite plant, the analysis of theyield, water content, ash content, salinity, NaCl content and vitamin A content.
Adsorption, Kinetic and Thermodynamic Studies for the Adsorption of Cadmium onto Combination of Chitosan and Coffee Ground Activated Carbon Nurhidayanti, Nisa; Riyadi, Agus
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.20364

Abstract

The presence of cadmium in water due to its natural mobility can cause the nature of the water to become toxic and threaten the surrounding ecosystem when it accumulates in the food chain. The aim of this study was to investigate the maximum adsorption capacity using an isothermal model, to determine the rate of adsorption kinetics using chitosan and coffee powder adsorbents in reducing cadmium concentrations in industrial wastewater, and to investigate its thermodynamic magnitude. The research method was applied with laboratory experiments followed by quantitative data analysis to determine the isothermal model and adsorption kinetics. The results showed that the adsorption isotherm follows the Langmuir isotherm model with a correlation coefficient of 0.9970 and a maximum adsorption capacity of 0.7546 mg.g-1, which indicates that the chemical adsorption occurs in a monolayer, where the  adsorption sites are homogeneously distributed with the adsorption energy. Permanent and negligible interactions between cadmium molecules (adsorbate) and adsorbent. Thus the pseudo second order kinetic model is a better way to explain the reaction rate for cadmium in combination chitosan and coffee ground activated carbon. Negative ΔGo values indicate that the adsorption reaction takes place spontaneously, ΔHo of 0.3467 indicates an endothermic reaction, and ΔSo of 3.5296 indicates an increase in the randomness of the adsorption process at the adsorbent interface and cadmium during adsorption.
Aplikasi Tandon-Filter untuk meningkatkan Kualitas dan Kuantitas Garam dalam Teknologi Greenhouse Salt Tunnel di Pantai Selatan dan Utara Jawa Timur Amin, Abd. Aziz; Salamah, Lutfi Nimatus; Zamzami, Ilham Misbakudin Al; Susanti, Yogita Ayu Dwi; Yanuar, Adi Tiya; Kurniawan, Andi
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.24877

Abstract

Salt is an essential commodity that concerns the livelihood of society and cannot be substituted by other commodities. East Java is the largest salt-producing center in Indonesia. The results of community salt production often still have NaCl content 95%. To achieve salt production results with NaCl quality 96%, research, and technology development are needed to eliminate impurities and improve the quality of the salt produced. One of the technologies being developed is the utilization of reservoirs and raw water filters. This research aims to analyze the application of reservoir and filter technology in improving the quality and quantity of salt production on the South and North Coasts of East Java using greenhouse salt tunnels. The results of this study indicate that the dynamics of environmental parameters and the quality of raw water on the South and North Coasts of East Java affect the results of the salt production process. The quality and quantity tests of salt with reservoir and filter application on the South Coast of East Java show NaCl quality of 98.13%, water content of 5.44%, and whiteness presentation value of salt 80.5% with production quantity of 7 kg/m². In trials on the North Coast of East Java, the salt quality was 98.25%, water content was 5.37%, and the whiteness percentage value of salt was 79%, with a salt production quantity of 7.8%. This research indicates that reservoir and filter technology can improve the quality and quantity of salt according to the characteristics of the South Coast and North Coast of East Java.
Revitalization of Indonesian Navy Language Education System in Promoting Human Resources Resilience Prasetya, Heri; Khusaini, Moh; Hamamah, Hamamah; Kusumaningrum, Adi
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.24909

Abstract

The writer concentates on the research about Indonesian Navy language education system. The method of the research is decriptive qualitative. In resulting the outcome of education program,  there are some problem findings that are required to be solved: the education program curriculla that are still obsolete and temporary, the incompetent educators and educational staff, lack of the standardized education facilities, as well as the low intensity of education cooperation programs.The problems cause the education process of international languages not running well, so it cannot result the qualified Indonesian Navy’s graduates. To achieve the expected Indonesian Navy personnel’s graduates, the language education system in Indonesian Navy institutions can be revitalized by updating, establishing and composing the new education program curriculums, managing the human resources by adding more educators and educational staff, improving the professional development and providing more wellfare or rewards, standardizing the education facilities, such as classrooms, language laboratories, libraries, dormitories and course book references, as well as collaborating with the other foreign languange education units domestically, regionally and internationally. After that, the writer finds the strategy of revitalizing the language education system in Indonesian Navy units.  By revitalizing the system, it can result the qualified graduates of Indonesian Navy personnel that can support the Resilience of Human Resources.
Implementasi Visual Studio pada Sistem Monitoring Daya dan Proteksi Rele Arus Lebih Menggunakan Automatic Transfer Switch/Automatic Main Failure (ATS/AMF) Disuplai oleh Kombinasi Grid dan Photovoltaic (PV) Riftianto, Andrian Eko; Amirullah, Amirullah
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.22151

Abstract

Monitoring power consumption and protecting the use of household electrical equipment with separate and remote Internet of Things (IoT)-based energy sources, is an important requirement in modern times. This paper proposes the implementation of a voltage and current monitoring system resulting from the output of an automatic transfer switch/automatic main failure (ATS/AMF) supplied by a PLN (grid) source and a photovoltaic (PV) generator. This power electronics device is used to control the combination of two separate energy sources automatically. The PZEM-004t sensor functions to read the value of the output voltage and load current from the ATS/AMF. Arduino-Uno is used to control the protection relay so that it is able to disconnect or connect load currents where the parameters of current, voltage and power as well as the performance of the protection relay are all monitored by Visual-Studio. Test results on eight loads, namely: 30 W LED lamp, 15 W LED lamp, solder heater, cellular phone charger, laptop charger, 5 W spiral energy saving lamp (LHE), 5 W bulb lamp, and portable fan using the PZEM-004t sensor monitored by Visual Studio and validated by a multimeter, the average error values for voltage and current measurements were 0.448% and 14.561%, respectively. The results of the relay protection test show that if the source is connected to a load that absorbs the load current below 0.6 A, then the trip indicator on the overcurrent protection relay has not turned on so that the protection menu display in the Visual Studio application is OFF. On the other hand, if the total load current exceeds 0.6 A, the trip indicator on the protective relay will light up so that the switch will cut off the load current. In this condition, the display of the protection menu in the Visual Studio application is in ON status.
Coral Fish Biodiversity Assessment on Different Locations (Case Study of the North Bali ICRG Area). Potje, Emilian Ivarlyano; Wiyanto, Dwi Budi; Giri Putra, I Nyoman; Demianus Hukom, Frensly
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.24171

Abstract

Reef fish associated with artificial reefs are one indicator of success for artificial reef applications. This research was carried out in February 2023. Reef fish data was collected in three tidal conditions. Data of Coral fish was collected using the Underwater Visual Census (UVC) method. The data that collected includes abundance of species, individual abundance and fish size from 3 categories namely major, indicators and targets. From the results, the community structure at each location obtained the same diversity index and uniformity index which were classified as moderate to high and the dominance index was classified as low. For each tidal condition the diversity index obtained was classified as medium to high, the uniformity index is relatively high and the dominance index is low. The total abundance of species at each point ranges from 26 species represented by 13 families to 63 species represented by 19 families, and for each tidal condition it ranges from 11 species represented by 7 families to 42 species represented by 16 families. The total abundance of individuals at each point overall ranged from 1333-20,048 Ind/Ha, each tidal condition it ranges from 20- 980 individuals. The total biomass at each point overall ranged from 102,844- 1353,119 Kg/Ha, each tidal condition ranges from 2,154 to 63,780 kg. Based on the results, the species similarity index values at each point were categorized as medium, except for Les II and Galeri, which were classified as high, while the test results for each tidal condition ranged from medium to high at each point. Test results (Mann-Whitney) for each point based on individual abundance values and coral reef fish biomass generally showed significant differences except between the Gallery and Les II points, whereas for each tidal condition there were no significant differences. Based on the results of the Correspondence Analysis, it was found that there was a relationship between several types of fish with each research point and at each tidal condition, this shows that the artificial reef structure at each point and each tidal condition was successful in attracting fish populations.
Analisis Structural Equation Modelling (SEM) Efek Kepemimpinan Transformasional, Kepuasan Kerja dan Komitmen Organisasional Terhadap Kinerja Karyawan Perusahaan Pelayaran Kurniawan, Thomas Aquinas; Nugroho, Sukmo Hadi
Rekayasa Vol 17, No 1: April, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i1.25351

Abstract

The purpose of this research is to analyze the influence of transformational leadership, job satisfaction and organizational commitment on employee performance through work motivation in shipping companies. The research used a questionnaire distributed online to collect data. Determining the research sample using a purposive sampling method, namely employees who work in shipping in the West Indonesia Region and Central Indonesia Time, namely 87 employees. To assess the strength of direct and indirect relationships between various variables, SEM and Partial Least Square (PLS) models were used. The results of this research indicate that transformational leadership has a significant effect on job satisfaction and organizational commitment. Job satisfaction has a positive and significant effect on work motivation. Organizational commitment has a positive and significant effect on work motivation and employee performance. Work motivation has a positive and significant effect on employee performance. Transformational Leadership has a positive and insignificant relationship to employee performance in a direct relationship and through an indirect relationship. Transformational Leadership has a significant relationship to work performance, mediated by organizational commitment and intervened by work motivation. Job satisfaction has an insignificant positive relationship with employee performance in a direct relationship, but job satisfaction has a positive and significant relationship with employee performance when intervened by work motivation.

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