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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 504 Documents
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Efek Koefisien Transmisi akibat Variasi Wave Stepness pada Hexagonal Artificial Reef Wirayuhanto, Harish; Armono, Haryo Dwito; Ridlwan, Asfafur; Febrianto, Try
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.12485

Abstract

Waves that move towards the coast have an energy level that corresponds to the magnitude of the generating force. Waves with high energy intensity are dominantly destructive when they hit the coastal area. In order to reduce the destructive effect of waves, coastal protection structures are needed to dampen the wave energy. Artificial coral reef (artificial reef) is one type of structure that can reduce wave energy. Besides functioning as an artificial reef for marine ecosystem biota, but also as a submerged breakwater structure. This study was conducted to determine the relationship between wave stepness and the transmission coefficient produced by hexagonal artificial reefs with a model scale of 1:10. The test is carried out using regular waves with a range of H/gT2 values between 0.0007 – 0.006. The results of research conducted at the Marine Energy Laboratory of the Department of Marine Engineering, FTK ITS, show that an increase in the value of wave steepness correlates with an increase in the value of the transmission coefficient (Kt) for all tests and configurations. The 1D structure configuration has a lower transmission coefficient (Kt) than the 0D structure configuration for each variation of the test wave.
Perbandingan Neural Network Backpropagation dan Extreme Learning Machine pada Robot Manipulator Munadhif, Ii; Pradhipta, Indan
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.10230

Abstract

Robotics technology and artificial intelligence devices are growing rapidly in the medical field. The work of medical workers will be made easier by the presence of this technology. It is also applied directly to patients. Patients suffering from variousdiseases, of course, need an appropriate solution. A robotic finger manipulator can be applied to a patient with disabilities to assist him in placing or retrieving items. In the manipulator robot, there are sensors, controllers, and actuators. The stimulation of the muscles in the forearm is detected by an electromyograph sensor. The resulting muscle stimulation is classified by the controller into servo motor movement. The motor represents the fingers. The classification method uses a neural network backpropagation and an extreme learning machine which is compared to the performance. Classification using neural network backpropagation has a success rate of 65.3%. While the classification using the extreme learning machine has a success rate of 78.7%.
Pengembangan Sistem Informasi Cuci Mobil Berbasiskan Website Rohmah, Maghfirotur; Syafiih, M.; Hudawi AS, Ahmad
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.11384

Abstract

The car wash business is growing. A wide selection of car washes, spread across various regions. The increasing number of cars will provide more opportunities for entrepreneurs to open up in the car wash industry, while also providing entrepreneurs with potential for opportunities in the car market. With so many customers owned by Fuji Lestari, it is very risky for errors to update data every day, because the current transaction processes in the place of business still do not use computers, including in recording the number of consumers and this makes it difficult for Fuji Lestari to find data from files stored and archived by the company. From the problems that have been described, the researchers propose a website-based car wash information system. The waterfall method was chosen as the method in this research to achieve the expected goals. From the research that has been carried out by the author regarding the Web-Based Car Wash Information System at Fuji Lestari, several conclusions can be drawn, namely the Web-Based Car Wash Information System at Fuji Lestari has been produced, and after testing 5 users, from the results of calculating the total percentage obtained a percentage of 91%. Therefore, this information system is categorized as very good and suitable for use at Fuji Lestari car wash business.
Aplikasi Structural Equation Modelling (SEM) pada Pola Kepemimpinan TNI AL Adijanto, Nugroho; Judijanto, Judijanto; Feriyanti, Nentin
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.11018

Abstract

In the era of globalization which is full of change and competition, an organization must show the best performance in order to survive through managing its resources through the right leadership. One indicator of the success of a leadership pattern is the creation of subordinate job satisfaction. With job satisfaction, a subordinate will be able to bring out his best abilities for the benefit of the organization. However, the existence of discipline enforcement efforts will affect the role of leadership patterns in realizing job satisfaction of subordinates in the organization. The purpose of this study is to identify the effect of leadership patterns on the job satisfaction of subordinates, and to identify this effect with the enforcement of discipline as a moderator. In this study, the types of leadership patterns observed were transformational leadership patterns, transactional leadership patterns, visionary leadership patterns and synergistic leadership patterns. Research data obtained from questionnaires distributed to respondents totaling 209 personnel who meet the requirements, then data processing is carried out using the structural equation modeling (SEM) method. The results of the SEM calculation show that without a moderating variable, discipline enforcement efforts, transformational leadership patterns and synergistic leadership patterns affect the job satisfaction of subordinates. Meanwhile, with efforts to enforce discipline, the transactional leadership pattern variable also has an influence on the job satisfaction of subordinates.
Effects of Dietary Salt-Based Minerals and Phosphorus Supplements on Mean Body Weight, Survival Rate and Feed Conversion Ratio of White Shrimp Reared In Brackish Water Amir, Nizar; Efendy, Makhfud; Hidayat, Agriananta Fahmi
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.11808

Abstract

This study aimed to examine the impact of dietary salt-based mineral and phosphorus supplements on mean body weight, survival rate, and feed conversion ratio of Litopenaeus vannamei (white shrimp) reared in brackish water. The experiment was performed randomized design with three replicates in each treatment used twelve 40 L rectangular polymethyl methacrylate containers reared 45 days. The four treatments in this study were based on the concentration of salt-based mineral and phosphorus supplements (control or 0 ppm, one ppm, two ppm, and three ppm) in dietary of white shrimp. The results showed that using salt-based mineral and phosphorus supplements in dietary of white shrimp positively impacts mean body weight, survival rate, and feed conversion ratio. Increasing the concentration of salt-based mineral and phosphorus supplements increased mean body weight and survival rate and reduced feed conversion ratio of white shrimp. The mean body weight, survival rate, and feed conversion ratio of white shrimp were achieved with three ppm of dietary salt-based mineral, and phosphorus supplements reared 45 days was 5.98 gr, 88.57%, and 1.45, respectively.
Review Strategis Upaya Pengamanan Laut Nasional Menuju Keamanan Maritim dan Pengelolaan Ruang Laut Indonesia Suharyo, Okol Sri; Bastari, Avando
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.13087

Abstract

The Republic of Indonesia as a world maritime country and an archipelagic country which has 17,504 islands whose territorial area is dominated by the ocean. As a maritime country, Indonesia has 4 (four) points that become international chokepoints, namely the Malacca Strait, Sunda Strait, Lombok Strait and the Ombai-Wetar Strait. Indonesia has established three Indonesian Archipelagic Sea Lanes (ALKI) for the peaceful passage of international shipping, which are guaranteed by international and national law. The Indonesian Maritime Security Agency is a Non-Ministerial State Institution whose position is under and directly responsible to the President and has the authority to enforce the law at sea and is justified by law, so that with the issuance of Law Number 32 of 2014 concerning Marine Affairs and Presidential Regulation Number 178 of 2014 concerning the Indonesian Maritime Security Agency, it can be interpreted that there is legal legitimacy for the Indonesian Maritime Security Agency in carrying out its duties, functions and authorities to carry out law enforcement against special crimes at sea. This study aims to explore Indonesia's strategic role in law enforcement at sea towards national maritime security and resilience. The method used is a literature study approach and the data analysis technique used is a qualitative data approach by conducting secondary data analysis to explain the findings obtained. This research produces findings in the form of an analysis of Indonesia's strategic role in law enforcement at sea towards maritime resilience and security both nationally and regionally.
Hubungan Fluktuasi Parameter Fisika dalam Produksi Garam Rich Minerals Dengan Media Prototype di Salt House Yoseva, Vellia; Indriyawati, Novi; Pratiwi, Wiwit Sri Werdi; Efendy, Makhfud
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.12556

Abstract

Madura Island is one of the largest salt producing areas in Indonesia. Salt is included in the type of complementary ingredients in every dish. Rich Mineral salt is salt obtained from the total crystallization process without removing various minerals contained in the raw materials, so that the mineral content is higher than consumption salt in general. This study aims to describe the fluctuations and the relationship between physical parameters consisting of water temperature, water density and water level during the salt production process. This study uses three prototype geomembranes with a size of 60x40x16 cm in salt production. This study uses quantitative methods in the form of numbers obtained based on facts in the field. The results of this study are that the three prototypes have a temperature range, water density and water level that are not significantly different. This is showed by the results of the ANOVA test, where the P-value of the three prototypes is greater than the alpha value (α). In this study also obtained a correlation value between the parameters of water density and water level. The correlation value resulting from the calculation of the linear equation between the two parameters is 0.93. Based on these results, it can be interpreted that the water density and water level have a correlation relationship of 93%. So, it can be concluded that the higher the water level, the lower the water level.  
Analisis Kelimpahan dan Keanekaragaman Perifiton di Sekitar Karamba Jaring Apung Sungai Barito Kalimantan Selatan Dharmaji, Dedy; Asmawi, Suhaili; Yunandar, Yunandar; Amalia, Intan
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.12054

Abstract

Perifiton whose life is attached to the substrate, acts as a provider of nutrients and indicators of fishery water quality. The purpose of this study was to analyze the structure, abundance and diversity of epiphytic and epidendric periphyton in floating net cages and water quality. This research was conducted by purposive sampling in upstream, middle and downstream. The method used is exploratory quantitative, from May and June 2021 with sampling time at the beginning of each month. The main phytoplankton periphyton composition consists of Chlorophyceae and Bacillariophyceae. Chlorophyceae increased from 19 genera at the beginning of the observation to 24 genera, while Bacillariophyceae decreased from 22 to 21 genera. Phytoplankton periphytons that were always present in each observation both at STA-1, STA-2 and STA-3 were Synedra, Diatoma, Tabellaria, Fragillaria, Zygnema, Spirogyra, Mougeotiopsis, Microspora, Chlorodesmis cosmosa and Closterium. Unstable community structure with an abundance of 600 – 1320 cells/liter, uniformity index 0.53 – 0.884, diversity index 1.104 – 1.750 and dominance index 0.14 -0.47 classified as oligotropic. Similar periphyton upstream and midstream, but different downstream. The presence of Synedra in all locations indicates that there has been a decline in water quality due to low dissolved oxygen. Water quality at the site informs that low pH, high ammonia and high organic matter result in low dissolved oxygen.
Classification of Dermoscopic Image of Skin Cancer Using the GLCM Method and Multi-SVM Algorithm Hasanah, Riyan Latifahul; Riana, Dwiza
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.12213

Abstract

The development of abnormal skin pigment cells can cause a skin cancer called melanoma. Melanoma can be cured if diagnosed and treated in its early stages. Various studies using various technologies have been developed to conduct early detection of melanoma. This research was conducted to diagnose melanoma skin cancer with digital image processing techniques on the dermoscopic image of skin cancer. The diagnosis is made by classifying dermoscopic images based on the types of Common Nevus, Atypical Nevus or Melanoma. Pre-processing is done by changing the RGB image to grayscale (grayscaling), smoothing image using median filtering, and image segmentation based on binary images of skin lesions. The value of Contrast, Correlation, Energy and Homogeneity obtained from the texture feature extraction of the GLCM method is used in the next step, which is the classification process with the Multi-SVM algorithm. The proposed research method shows high accuracy results in diagnosing skin cancer
Perancangan Decoupling Control System Suhu dan Kelembapan Menggunakan Metode Kontrol PID pada Mesin Pengering Krupuk Tipe Trush Burner Basruqi, Basruqi; Basri, Muhammad Hasan
Rekayasa Vol 14, No 3: Desember 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i3.11392

Abstract

Crackers are one of the traditional foods in Indonesia which now has many home industries to produce it. There are 3 ways of drying, including traditional, modern, and hybrid. In the study of designing a temperature and humidity control system using the PID method on a trush burner cracker dryer, it was carried out in a modern way, with the materials needed for design, plastic waste, Arduino Uno, DHT11 sensor, oven, boiler, and pump. From the test results, the maximum water pipe testing was carried out at a temperature of 53 oC, the maximum drying room temperature was 45 oC, and the maximum boiler temperature was 56 oC. The function of the temperature and humidity control system on the trush burner type cracker dryer helps dry crackers practically in rainy season conditions

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