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Alfian Qomaruddin
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Universitas Trunojoyo Madura Jl. Raya Telang - Kamal, Bangkalan Kode Pos 69162
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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.
Arjuna Subject : -
Articles 517 Documents
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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. 
Pengaruh Massa Perekat Tapioka Terhadap Durabilitas Biobriket dari Arang Kulit Singkong Fitriyano, Gema; Sari, Fatma; Susanty, Susanty; Ar Rahim, Dicka; Nabilah, Rifa; Wulandari, Qodirani Apri
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.v17i2.22549

Abstract

Commercially competitive in the global market, bio-briquettes derived from coconut shell charcoal have been extensively manufactured and meet all standard prerequisites. Bio-briquettes sourced from different biomass materials, with calorific values that meet the criteria, have not entered commercial production. Currently, they remain in the research and development phase. One of the reasons is the suboptimal durability value of the bio-briquettes, causing the products to easily break during distribution and usage. This research aims to determine the optimal amount of binder in the production of bio-briquettes from cassava peels. This is because cassava peels have calorific values that meet the requirements and have a huge potential for commercial-scale production. This study utilizes cassava peel charcoal as the raw material mixed with tapioca binder in variations of 9%, 10%, 11%, 12%, and 13% of the cassava peel charcoal mass. The optimal percentage of tapioca binder mass was found at 9% with a durability value of 99.54%, density 1 g/cm3 and water content 5.39%.
Karakteristik Kombucha dengan Penambahan Ekstrak Kayu Manis (Cinnamomum burmannii) dan Kayu Secang (Caesalpinia sappan) pada Proses Fermentasi Sekunder Wahyudi, Ikwan; Lisdiana, Lisdiana; Astuti, Budi
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.v16i3.17791

Abstract

This study aims to determine the characteristics of kombucha produced from a secondary fermentation process with the addition of extracts of cinnamon (Cinnamomum burmannii) and secang wood (Caesalpinia sappan). The study used a RAK design with 2-factor treatments and 4 replications. Treatment factors included the addition of ingredients (control, cinnamon, and secang wood) and secondary fermentation time (24, 48, and 72 hours). Characteristics observed include analysis of pH, density, and color (Lab). The results showed that there were significant differences in the pH value, density, and color due to the various treatments of adding ingredients. The pH value and density of kombucha did not differ significantly due to the variation in secondary fermentation time, but there were significant differences in the color of kombucha based on the secondary fermentation time.
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.
Rancang Bangun Sensor Deteksi Gizi Berdasarkan Standar Atropometri Anak Maknunah, Lu'lu'ul; Ulum, Miftachul; Sukri, Hanifudin
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.v16i3.19116

Abstract

In general, children's growth is monitored through Posyandu activities. This Posyandu seeks to monitor the growth and development of children so they do not experience malnutrition or malnutrition. One of the main factors in the process of physical growth and development is nutrition. However, the problem facing Posyandu today is the infrastructure used, namely measurement tools that still use conventional tools. This certainly affects the efficiency of parents in monitoring the growth and development of children, therefore this study designed a nutritional detection system for infants. The working principle of this tool utilizes an ultrasonic sensor to determine the baby's length and a load cell sensor to determine the baby's weight. The data detected by the two sensors will be processed using the stm32 microcontroller. By using the nutritional z-score formula, it can be classified into several statuses based on child anthropometric standards. Processed data will be displayed on the LCD and then stored in the MySQL database to make it easier to read the measurement results. In this study the test was carried out 10 times with different respondents. The data obtained from testing the design tool is compared with the measurement results on conventional tools so that an error is obtained on the weight sensor (load cell) of 3.3% and a success rate of 96.7%, the average percentage error on the height sensor (ultrasonic ) of 0.3% and a success rate of 99.7%.
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.
Analisis Faktor Penyebab Time Overrun Proyek Pembangkit Listrik Dengan Pendekatan Partial Least Square Structural Equation Modeling Ariyanto, Agus Dwi; Armono, Haryo Dwito
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.v17i2.26597

Abstract

Power plant projects are crucial to providing andining a reliable power system. Power plant projects, like other construction projects, often experience a problem of delayed completion of work known as time overrun, which can result in financial losses and project failure to be completed on time. Time overrun is overtime that exceeds the completion date specified in the contract or the project submission date agreed by both parties. Engineering, procurement, construction, and commissioning are all parts of the power plant construction project. In completing the project, it is essential to understand why the power plant construction project is delayed and how to properly mitigate the risk. This research is quantitative research, which means using a questionnaire. The aim of this study is to find out what caused the time overrun of the power plant project at the Timorese PLTU. Partial Least Square Structural Equation Modeling (PLS-SEM) is used to process data from questionnaire results. The results of the research showed that there were seven research hypotheses, with two accepted and five rejected. The external factors, and the owner-related factors are the time overrun factors based on the accepted hypothesis. Based on the cause of the time overrun, some mitigation measures can be recommended to management including a memorandum of understanding (MoU) scheme with stakeholders related to existing permits, a scheme related to contractual and technical procedures when unforeseen conditions occur and ensuring the quality of the results of the soil investigation.
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.
Waste Analysis Of Pasted Woven Production Process Using Lean Six Sigma Method Agustina, Mega; Rochmoeljati, Rr.
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.v17i2.25646

Abstract

This research was conducted in a company engaged in the production of cement bags which include pasted woven, pasted kraft, and sewn woven. Waste is still generated on the production floor throughout the pasted weaved manufacturing process. The essential waste that happens, including faults, waiting, Environmental, Health, and Safety, as well as other problems that cause the lead time to be too lengthy, namely 1430 minutes. The goal of this study is to assess the degree of waste that happens by calculating Defects Per Million Opportunities and the sigma level, as well as to make recommendations for improvement. The research results show that the reduction in lead time for waste of non-value-added defects in the pasted woven production process, which was originally worth 1430 minutes, can be reduced to 1365 minutes by reducing activities in the form of a 65-minute delay, thereby reducing cycle time in the pasted woven production process. The average DPMO value was 36898 at a sigma level of 3.284. Proposed modifications to decrease waste are analyzed using Failure Mode and Effect Analysis and Risk Priority Number values to identify the sources of waste. Recommendations for companies provide training to operators to avoid human error, inspect raw materials before entering the production process and periodically control the condition of machines.

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