Infotekmesin 2024-05-29T15:07:48+07:00 Ratih Hafsarah Maharrani Open Journal Systems <p align="justify"><strong>INFOTEKMESIN&nbsp;</strong>is a peer-reviewed open-access journal with e-ISSN <strong><a href=";1564733309&amp;1&amp;&amp;" target="_blank" rel="noopener"> 2685-9858</a>&nbsp;</strong>and p-ISSN: <strong><a title="ISSN" href=";1339729931&amp;1&amp;&amp;" target="_blank" rel="noopener">2087-1627</a></strong> published by Pusat Penelitian dan Pengabdian Masyarakat (P3M) Politeknik Negeri Cilacap. The journal invites scientists and engineers to exchange and disseminate theoretical and practice-oriented in the various topics include, but not limited to <strong>Informatics, electrical Engineering, and mechanical Engineering.</strong> Submitted papers must be written in Bahasa or English for an initial review stage by editors and further review process by a minimum of two reviewers.<br>The editors will only accept the manuscripts which meet the assigned format. Please submit your manuscript and Download&nbsp;the template&nbsp;<a href=""><strong>HERE</strong></a><br><strong>Jurnal&nbsp;<strong>INFOTEKMESIN</strong> has been accredited as a scientific journal by the </strong><strong>Ministry of Research and Technology/National Research and Innovation Agency Republic of Indonesia:&nbsp;<a href="" target="_blank" rel="noopener">SK-AKREDITASI No.200/M/KPT/2020 (SINTA 3)</a>. <br></strong><strong>Certificate of accreditation can download <a href="" target="_blank" rel="noopener">HERE</a></strong></p> Analisis Performa dan Studi Konsumsi Energi Kendaraan Listrik Sepeda Motor Listrik SEMOLI 2024-01-28T01:10:16+07:00 Nur Akhlis Sarihidaya Laksana Radhi Ariawan Bayu Aji Girawan Akhlis Rahman Sari Nurhidayat <p>In this article the author conducts research related to energy consumption studies on electric motorbike vehicles (SEMOLI) made and developed by the author. The purpose of the energy consumption study is to determine the energy consumption of electric motorbike vehicles that have been made for further improvement and development. The method used is experimentation with the first phase testing on a straight flat road for one kilometer with flat road conditions, this phase of experimental results shows an average energy consumption of 30 Wh, for an average uphill road consumption of 40 km / h and for the second phase of experimental data using experimental methods with speed parameters 30 - 35 km energy consumption has an average of 30 Wh, at speeds of 40 - 45 km / h energy consumption has an average of 28 Wh, and 50-55 km / h average energy consumption of 27 Wh. The test results show that on flat road conditions and the increasing speed, the energy consumption will decrease.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-22T05:02:54+07:00 Copyright (c) 2024 Nur Akhlis Sarihidaya Laksana, Radhi Ariawan, Bayu Aji Girawan, Akhlis Rahman Sari Nurhidayat Comparison of The Dempster Shafer Method and Bayes' Theorem in The Detection of Inflammatory Bowel Disease 2024-01-28T01:10:16+07:00 Linda Perdana Wanti Nur Wachid Adi Prasetya Oman Somantri <p>This study discusses the comparison of the Dempster-Shafer method and Bayes' theorem in the process of early detection of inflammatory bowel disease. Inflammatory bowel disease, better known as intestinal inflammation, attacks the digestive tract in the form of irritation, chronic inflammation, and injuries to the digestive tract. Early signs of inflammatory bowel disease include excess abdominal pain, blood when passing stools, acute diarrhea, weight loss, and fatigue. The Dempster-Shafer method is a method that produces an accurate diagnosis of uncertainty caused by adding or reducing information about the symptoms of a disease. Meanwhile, Bayes' theorem explains the probability of an event based on the factors that may be related to the event. This study aims to measure the accuracy of disease detection using the Dempster-Shafer method compared to the probability of occurrence of the disease using Bayes' theorem. The results of calculating the level of accuracy show that the Bayes Theorem method is better at predicting inflammatory bowel disease with a probability of occurrence of disease in the tested data of 75.9%.</p> 2024-01-22T08:48:14+07:00 Copyright (c) 2024 Linda Perdana Wanti, Eka Tripustikasari Perancangan Sistem Presensi Siswa dengan RFID Berbasis IoT Menggunakan NodeMCU ESP8266 2024-01-28T01:10:16+07:00 Suliswaningsih Suliswaningsih Nugie Dwitama Anugerah Bagus Wijaya <p>Dewantara Sumbang Vocational School has 4 majors, namely Business and Motorcycle Engineering, Multimedia, Graphic Design, and Sharia Banking and the current number of students is quite large, namely 537. The teacher keeps track of attendance for each topic in each class. The student attendance process is carried out manually, namely recording in the attendance book. Attendance book documents are susceptible to damage such as tearing, getting wet, and being lost. So it will cause difficulties during the recording process at the end of the semester and it requires many attendance book documents. Apart from that, it requires storage space for attendance documents. Using RFID in the design of an automatic attendance system to track students' attendance in class and Internet of Things (IoT) infrastructure is the solution to this issue. The study employs a Waterfall method approach, with steps starting with requirements analysis, and moving on to system design, testing, implementation, and maintenance. The research results are the design of an automated student attendance system based on IoT and RFID. The attendance system for 28 students in 1 class takes 16 minutes, 4 minutes faster than the manual attendance system, which is 20 minutes. Teachers can see the results of the attendance data recap through the website interface which includes information on subjects, classes, majors, academic year, semester, names of students present, KBM date, entry time, and class exit time.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-22T10:00:42+07:00 Copyright (c) 2024 Suliswaningsih Suliswaningsih, Nugie Dwitama, Anugerah Bagus Wijaya The Green Campus Building's Rooftop Photovoltaic System Design Project 2024-01-28T01:10:16+07:00 Handoko Rusiana Iskandar Deri Mardiansyah Atik Charisma Een Taryana Yuda Bakti Zainal <p>Universitas Jenderal Achmad Yani, whose major campus is in Cimahi City, is constructing a large-scale campus development, the size of which is directly proportionate to the quantity of energy consumed. This increase in electrical energy consumption can be minimized by utilizing environmentally friendly renewable energy sources to supply loads and reduce the use of existing energy from the grid (PT. PLN). This context supports a design proposal for the production of photovoltaic-based photovoltaic on the Universitas Jenderal Achmad Yani campus, particularly in two buildings with exceptional roof potential. In this paper, the modeling carried out aims to help supply renewable energy-based electrical energy. The design of PV on Grid Installation Engineering in Buildings at Universitas Jenderal Achmad Yani carried out in this paper includes PV placement layout, PV construction, and simulation using PVsyst. The rooftop-type grid-connected PV is modeled in the Faculty of Health Sciences and Technology (FHST) Building and the Rectorate Building, which are composed of PV panels, inverters, and other supporting components. Grid PV design and simulation modeling on the roofs of FITKES and Rectorate Buildings resulted in a total installable PV capacity of 420 kWp, an annual average Performance Ratio of 80.6%, and an average potential energy output of 702 MWh/year. This energy potential is undoubtedly proposed to fulfill future electricity needs.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-22T00:00:00+07:00 Copyright (c) 2024 Handoko Rusiana Iskandar, Deri Mardiansyah, Atik Charisma, Een Taryana, Yuda Bakti Zainal Penerapan Multi-Palette Color untuk Pemberian Saran Pemilihan Warna Tema Desain Visual Vektor 2024-01-28T01:10:16+07:00 Suliswaningsih Adam Prayogo Kuncoro Ali Nur Ikhsan Muhammad Thoriq Jamil Syahrul Sani <p>In graphic design, many creative applications offer many templates. This design platform is suitable for creative designers and hobbyists such as marketers, bloggers, social media managers, etc. In a design workflow, users select a template and replace elements with their resources. Instead of creating one color palette for all elements, researchers extract multiple color palettes from each visual element in a graphic document and then combine them into a set of colors. Researchers design sample color schemes to complement color sets and we recommend colors that might be determined based on the color context in a multi-palette. Researchers conducted model training and created a color recommendation system for a collection of vector visual designs. The proposed color recommendation method is targeted to be a color prediction medium, as well as a color recommendation system on vector media. The results of this study are in the form of color recommendations for vector graphic design based on a multi-palette of visual elements.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-22T12:25:41+07:00 Copyright (c) 2024 Suliswaningsih, Adam Prayogo Kuncoro, Ali Nur Ikhsan, Muhammad Thoriq Jamil, Syahrul Sani Desain Pisau Pengurai dan Sistem Pengayak serta Uji Produk Mesin Pengolah Sabut Kelapa sebagai Bahan Mentah Komposit 2024-01-28T01:10:16+07:00 Roy Aries Permana Tarigan Kaleb Priyanto Jenal Sodikin M R Pratama I R Ramadhani <p>This research aims to design a decomposing blade, sieving system, and test machine products. The method for completing coconut fiber processing machines consists of three stages, namely the design and production process stages, as well as machine product testing. This research produces the following data, namely the design of the untangling knife which is a combination of the functions of the coir untangling knife for random and woven results. Calculation of the equilibrium moment on the shaft obtained a value of 𝑅𝑉𝐵 is 28.68 N and the reaction at point A was 𝑅𝑉𝐴 is 28.32 N, with the diameter of the shaft used in the coconut fiber sieving machine transmission system being Ø28 mm. Fiber uniformity is obtained from twice decomposition processes, whereas the level of fiber/powder uniformity is influenced by the long sieving process time and also the high rotational speed of the sieve.</p> 2024-01-23T03:55:54+07:00 Copyright (c) 2024 Roy Aries Permana Tarigan, Kaleb Priyanto, Jenal Sodikin, M R Pratama, I R Ramadhani Analisis Pengaturan Inverter Terhadap Unjuk Kerja Mesin Planer Bambu V2 Dalam Menghasilkan Serutan Bambu Laminasi 2024-01-28T01:10:16+07:00 Silvano Virgio Prasta Prasta Ignatius Aris Hendaryanto Budi Basuki Radhian Krisnaputra Sugiyanto Inggar Septhia Irawati <p>Planer bamboo machine V2 is a machine used to flatten the top and bottom surfaces of bamboo slats. This machine was made to overcome problems with existing machines in the form and long times of drawstring. An inverter is added to set the rotational speed roller. This study analyzes the effect of a combination of the top and bottom cutting speeds on the rotation speed of roller whose rotation speed was set at frequencies of 10, 20, 30, 40, and 50 Hz. The purpose of the study is to determine the effect of inverter frequency settings on the results of bamboo drawstring. Based on the analysis performed, the appropriate combination for the performance planer bamboo machine is by setting the inverter frequency to 20 Hz with a production result in a day of 54,54 slats drawstring with long of slats 2 meters, with a total power consumption of 2,483 kWh in one hour.</p> 2024-01-23T04:19:42+07:00 Copyright (c) 2024 Silvano Virgio Prasta Prasta, Ignatius Aris Hendaryanto, Budi Basuki, Radhian Krisnaputra, Sugiyanto, Inggar Septhia Irawati Upgrading Bahan Bakar Jumputan Padat (BBJP) Sebagai Co firing Sistem Tenaga Uap Melalui Thermal Drying dan Fermentasi 2024-05-29T15:06:37+07:00 Mastur Mastur Bambang Sugiantoro Nugrah Rekto Prabowo Nana Supiyana Utis Sutisna <p>The waste sorting process produces organic and inorganic waste. It can be converted into Solid Recovered Fuel with the addition of a maximum of 20% plastic, which can be used for co-firing coal combustion in steam power systems. High humidity levels and the condition of organic waste with its various constituent components require drying and other treatments to increase the calorie content. Types of organic waste treatment, methods of drying, and decomposition of organic waste went through a fermentation process. The research aims to identify the effect of fermentation, addition of biomass, and plastic shreds of BBJP products on density, ash content, chlorine, and calorific value. Dimensions of organic waste powder at a level of 50 mesh and plastic shreds of 5-10 mesh are aimed at increasing the pellet/SRF bond. Mechanical testing data in the form of compression testing resulted in a level of resistance that exceeded pellet strength requirements and increased by 67%. Chlorine and sulfur levels are approaching the limit, but ash levels are still high. The calorific value of pellets in the fermented organic waste specimen treatment produces a higher calorific value compared to other treatments. Research on converting waste into co-firing fuel in solid form with the criteria for calorific value and physical properties that comply with the technical requirements for co-firing steam-powered systems can still be optimized to produce fuel with a higher calorie content. Reducing chlorine, sulfur, and ash levels is done for a low-carbon and environmentally friendly combustion process.</p> 2024-01-27T23:34:14+07:00 Copyright (c) 2024 Mastur, Bambang Sugiantoro, Nugrah Rekto Prabowo, Nana Supiyana, Utis Sutisna Uji Eksperimental Efisiensi Panas Alat Pengering Surya dengan Menambahkan Batu Koral Sebagai Material Sensible Heat Storage 2024-01-28T01:10:17+07:00 Kemas Muhammat Abdul Fatah Ibnu Azis <p>Renewable energy sources originating from solar are the most environmentally friendly energy because they do not cause any pollution. The utilization of solar energy can be in the form of a direct passive solar dryer for preserving agricultural and fishery products. Solar energy has limitations related to intermittent solar irradiation, so it is necessary to add Sensible Heat Storage (SHS) material to increase thermal efficiency. Pebble stones are an SHS material that is abundantly available in a variety of colors, and suitable for solar dryers with low-temperature requirements. The study aimed to find temperature conditions and thermal efficiency through experimental tests three times, twice with SHS material, respectively white and black pebble stones, and once without SHS material. The experimental test results found that the temperature of the drying chamber was more stable with the addition of SHS material, and the highest thermal efficiency was obtained from black pebble stones, namely 49%, and white pebble stones, 40%.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-23T08:23:37+07:00 Copyright (c) 2024 Kemas Muhammat Abdul Fatah, Ibnu Azis Analisa Beban Penekanan Hidrolis Terhadap Kekerasan Komposit Resin Epoksi Berpenguat Serbuk Kulit Jagung dan Fly Ash Menggunakan Metode Compression Molding 2024-01-28T01:10:17+07:00 Mirza Pramudia Teguh Prasetyo Rifky Maulana Yusron Mohammad Safiudin <p><span style="font-weight: 400;">Using fly ash and natural fibers as environmentally friendly composite materials is expected to reduce the negative impact of fly ash as industrial waste, turning it into a material with added value. One of the methods in composite manufacturing is the compression molding method. This research aims to analyze the influence of compaction loading variations on the hardness values of epoxy composites reinforced with corn husk-fly ash powder. The research begins with producing composite specimens containing corn husk powder (20% wt) and fly ash (10% wt). The specimens are pressed with compaction loading variations of 1 ton, 2 tons, 3 tons, and 4 tons. The specimens from the compression molding are then subjected to sintering treatment at 150°C for 1 hour, followed by Shore D hardness testing. The results show that the composite material's hardness increases with the compaction loading. The highest hardness is achieved at a compaction load of 4 tons with a hardness value of 80.3 SHD. The compaction process of the composite material produces a fly ash structure that undergoes agglomeration or structural densification. This phenomenon results in an increase in the hardness of the material along with an increase in the compaction loading.</span></p> 2024-01-23T09:43:50+07:00 Copyright (c) 2024 Mirza Pramudia, Teguh Prasetyo, Rifky Maulana Yusron, Mohammad Safiudin Brake Thermal Efficiency dan Exhaust Gas Temperature Mesin Bensin Berbahan Bakar Gasoline-Butanol 2024-01-28T01:10:17+07:00 Firman Lukman Sanjaya Faqih Fatkhurrozak Syarifudin Amin Nur Akhmadi <p>The development of butanol as a gasoline additive is encouraged by the government to reduce pollution and the fuel crisis. This is because butanol is a green fuel that is environmentally friendly and can be produced. In addition, the octane number and high oxygen concentration in butanol optimize engine performance and improve exhaust emissions. This research correlates engine power and Brake specific fuel consumption (BSFC) with the BTE of gasoline-butanol-fueled engines and identifies the content of Nox compounds in exhaust gases through engine Exhaust Gas Temperature (EGT). The percentage of butanol in gasoline is 5% -15%. Engine speed from 1000-3000 rpm. Dynotest is used to measure BTE while the thermocouple is used to measure exhaust gas temperature. This research proves that the addition of butanol increases energy absorption which is converted into power with effective fuel consumption which means BTE increases. The highest BTE increase was 21.7% in the B15 blend. EGT decreased by 8.6% in the B16 mixture compared to B0. This identifies that the concentration of Nox in the exhaust gas also decreases.</p> 2024-01-23T12:18:35+07:00 Copyright (c) 2024 Firman Lukman Sanjaya, Faqih Fatkhurrozak, Syarifudin, Amin Nur Akhmadi Pengembangan Aplikasi Penyewaan Mobil Menggunakan Metode Prototyping dengan Online Payment Gateway Midtrans 2024-01-28T01:10:17+07:00 Radig Gedhe Prihatmoko Egia Rosi Subhiyakto <p>Car rental has become one of the most profitable industries, as cars have become an essential means of transportation for various societal needs, such as family activities and work. Many car rental companies still rely on conventional methods for promotions and reservations. There is one car rental place whose rental and promotion system still uses WhatsApp chat and telephone or comes directly to the rental. A website-shaped system is crucial as a company platform to showcase available vehicles, enable online transactions for rentals, and facilitate easy and convenient payments. The development of this website involves prototyping with PHP and MySQL programming languages, and the payment system incorporates the Midtrans payment gateway. The system is tested using Blackbox and User Acceptance Testing (UAT). This website's development aims to simplify the booking process for customers and enhance the company's ability to manage vehicle data and payments efficiently. Following the system's construction, testing is conducted, with the results of the UAT indicating a user satisfaction score of 90.8%. Based on the evaluation, the majority of users strongly agree with the developed application.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-23T16:11:55+07:00 Copyright (c) 2024 Radig Gedhe Prihatmoko, Egia Rosi Subhiyakto Grand Design and Economic Analysis of Solar-Wind Hybrid Renewable Energy Systems in MSTP Jepara 2024-02-03T05:10:57+07:00 Denis Denis Jaka Windarta Vicky Prasetia Gladys Datita Nathania Richad Juven Hariara Ahmad Arif Razaqi <p>Marine Science Techno Park (MSTP) Jepara is a center of technology implementation aimed to encourage community economy development in the maritime sector. At present, Marine Science Techno Park (MSTP) Jepara’s electrical energy source is supplied by Perusahaan Listrik Negara (PLN), with coal-powered steam turbine generators as the main source of electrical energy generation. Therefore, a cleaner and more sustainable means of electrical energy generation is needed to fulfill the high energy demand. With this in mind, Universitas Diponegoro, as the proposer, in collaboration with MSTP Jepara, as the recipient, proposes the initiation of Hybrid Renewable Energy Systems (HRES) Power Plant construction as a way of obtaining an environmentally friendly and sustainable source of energy in this research as well as addressing the issues in the previous HRES simulations and implementations. This article will discuss various scenarios, their feasibility for implementation, and the economic returns gained from HRES installation on-site.</p> 2024-01-24T04:32:53+07:00 Copyright (c) 2024 Denis , Jaka Windarta, Vicky Prasetia, Gladys Datita Nathania, Richad Juven Hariara, Ahmad Arif Razaqi Pengembangan Sistem Layanan Penerimaan Peserta Didik Baru Berbasis Web Menggunakan Metode System Development Life Cycle 2024-01-28T01:10:17+07:00 Andi Dwi Riyanto Subani Charis Prasetya Ilham Alif Jamaluddin <p><span style="font-weight: 400;">In today's digital era, technology has become an important element in various aspects of life, including in the education sector. YPE Kroya Vocational High School in Cilacap, which currently has a manual new learner registration process, faces challenges in managing registration data that can lead to errors such as incorrect name writing and column placement. To overcome this problem, the research team developed a website-based New Learner Admission service system. This system is designed to facilitate the registration and selection process while improving efficiency in data management. The development of this system follows the System Development Life Cycle (SDLC) method, resulting in an effective website-based PPDB service system. This system not only facilitates the registration process and data management of prospective students but also provides solutions to problems that exist in the conventional registration process. System testing has been conducted through Black Box and User Acceptance Testing (UAT) methods validating the reliability and usability of the system. The results of the UAT analysis showed that the system received a very positive assessment from the users with an average score of 4.48 (90%) for Design, 4.44 (89%) for Efficiency, and 4.42 (88%) for Service. </span></p> 2024-01-24T13:17:19+07:00 Copyright (c) 2024 Andi Dwi Riyanto, Subani Charis Prasetya, Ilham Alif Jamaluddin Implementasi Principal Component Analysis (PCA) pada Pengenalan Wajah Resolusi Rendah 2024-01-28T01:10:17+07:00 Reza Phina Tanjung Danang Wahyu Utomo <p>Face recognition involves matching facial features by restricting the facial area. The problem found in the experiment was that the program recognized images outside the face area, especially for low-resolution images. The PCA algorithm and the proposed bounding box approach can identify the facial area and match it with training data. The experiment uses the Yaleface and Face94 datasets in various scenarios, including normal resolution and resolution reduction (75%, 50%, and 25% of the original size). On gif images, the proposed algorithm can produce similarities between the detected image and the input image in a resolution reduction of up to 50%. On jpg images, reducing resolution to 75% does not affect the performance of PCA. The proposed method can recognize faces with similarities in variations of pose and facial expression. The Euclidean value of the jpg image produces a better similarity value than the gif image.&nbsp;</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-24T13:48:14+07:00 Copyright (c) 2024 Reza Phina Tanjung, Danang Wahyu Utomo Implementasi Algoritma Logistic Regression pada Pembuatan Website Sederhana untuk Prediksi Penyakit Jantung 2024-01-28T01:10:17+07:00 Chyntia Raras Ajeng Widiawati Lisa Nurazizah Ika Romadoni Yunita <p>Heart disease is a deadly disease, early recognition is important to prevent the fairly high death rate due to this disease. There are various ways to detect heart disease early, one of which is by utilizing machine learning. In this research, the author uses secondary data, namely data taken from the website for the prediction process. The amount of data used was 297 data, with details of 160 data not detecting heart disease, and 137 data detecting heart disease. Apart from making predictions from heart disease patient data using the logistic regression algorithm, this research also implements the model that has been created on the website. The results of implementing the logistic regression algorithm in this research are an accuracy value of 0.9, precision of 0.92, recall of 0.86, and f1-score of 0.89. After measuring using these 4 parameters, the model that has been created is then implemented into a simple website using the Rapid Application Development (RAD) method.</p> 2024-01-24T14:52:46+07:00 Copyright (c) 2024 Chyntia Raras Ajeng Widiawati, Lisa Nurazizah, Ika Romadoni Yunita Analisa Terjadinya Electrical Treeing Pada Isolator Komposit dengan Bahan Pengisi Serat Pelepah Nipah 2024-01-28T01:10:17+07:00 Saepul Rahmat Riyani Prima Dewi Erna Alimudin <p>Technological developments in materials are increasingly evolving, one form of development is the type of composite insulation. One of the natural fiber composites currently available is a composite from palm fiber which provides increased dielectric strength. Partial discharge due to voids in the composite results in structures such as electrical treeing due to changes in the properties and morphology of the composite causing increased insulation failure and disrupting power distribution. This research tested the strength of Epoxy composite insulation and palm leaf ash filler. By combining these two materials, a complementary composite insulating material will be formed to prevent electrical treeing. The results of the research show that the composite insulating material with nipa palm fiber as filler has an average breakdown voltage value of 40 kV and is above the standard breakdown voltage value for medium voltage insulators of 30 kV. The addition of more and more palm leaf ash filling material will produce voids, thereby accelerating the occurrence of electrical treeing and decreasing the breakdown voltage of the insulation.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-24T00:00:00+07:00 Copyright (c) 2024 Saepul Rahmat, Riyani Prima Dewi, Erna Alimudin Investigation on Exhaust Emission and Performance of SI-Matic Engine Applied Acetone-Butanol-Ethanol (ABE) Fuel Mixtures 2024-01-28T01:10:17+07:00 Gatot Setyono Navik Kholili Galih Ageng Kurniawan Deny Surya Pratama <p><span style="font-weight: 400;">Acetone-butanol-ethanol (ABE) is a preferred alternative energy for SI engines. This research uses an experimental method with an automatic SI engine, RON-90 fuel mixed with ABE1 (12:8:1)v/v, ABE2 (15:10:1)v/v and ABE3 (1i8:12:1) v/v. Engine speed is 4000-10000rpm, and compression ratio is 11.6:1. Emission and engine performance testing used EPSG4-Gas analyzer and Dynotest-chassis type 50L-BRT. This research aims to explore the mixture of RON-90 and ABE to optimize performance and exhaust emissions. This research shows that torque increases by an average of 14.7% at an engine speed of 6000rpm. Power increased significantly with an average value of 9.5% at an engine speed of 8000rpm, MEP increased by 0.5%, and thermal efficiency increased by 7%. SFC experienced a fairly optimal decrease of 15.6% on average. The exhaust gas emissions produced are CO and HC. The reduction in CO and HC occurred in the ABE3 variant with values of 8.2% and 1.6%, respectively.</span></p> 2024-01-24T16:16:34+07:00 Copyright (c) 2024 Gatot Setyono, Navik Kholili, Galih Ageng Kurniawan, Deny Surya Pratama Integrasi Budidaya Tanaman Kangkung (Ipomea Aquatica Forsk) dan Ikan Nila Menggunakan Internet of Things 2024-01-28T01:10:17+07:00 Murni Handayani Arif Sumardiono Khoeruddin Witriansyah Fadillah <p>Aquaponics is an application of a sustainable agricultural system by integrating the cultivation of plants and fish at one time. Water availability in plant commodities and water is optimized in aquaponic cultivation systems. Several parameters that can determine the level of success of cultivating an aquaponic system include water pH, water temperature, TDS, and water level. The process of monitoring and controlling several important parameters in cultivation can be done conventionally, but it is less effective and efficient because the cultivator has to check and measure the parameters every time. Therefore, as time goes by, and technology becomes more sophisticated, a control and monitoring system is designed. several parameters such as water pH, water temperature, TDS, and water level based on the Internet of Things (IoT) to support the success of the aquaponics system by monitoring environmental conditions using a laptop/smartphone at that time. Based on the test results, it was found that aquaponics in an indoor environment is successful - the air conditioner has a water temperature below 250C, the water pH shows 7pH and the average nutrient in the water shows 214.5 ppm. Based on this, kale plants in the stem grow quickly while leaf growth is very stunted. At temperatures smaller than 25 <sup>0</sup>C pomfret fish only survive for 2 weeks but tilapia fish can survive and not die in these environmental conditions. The length of the tilapia fish for 6 weeks has increased by 5 cm from its original length</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-24T17:12:24+07:00 Copyright (c) 2024 Murni Handayani, Arif Sumardiono, Khoeruddin Witriansyah, Fadillah Metode Fuzzy Time Series Markov Chain Untuk Peramalan Curah Hujan Harian 2024-01-28T01:10:18+07:00 Laura Sari Annisa Romadloni Rostika Listyaningrum Fadhilla Hazrina Nur Wahyu Rahadi <p>Cilacap Regency has diverse topography and geographical conditions which cause this region to have rainfall that varies spatially and temporally; therefore, a forecasting method to overcome these uncertainties and fluctuations is needed. Fuzzy Time Series Markov Chain utilizes Fuzzy logic which provides flexibility in handling uncertain and unstructured data. Moreover, the addition of Markov chain elements that utilize Fuzzy logic concepts provides flexibility in handling data allowing the model to capture inter-time relationships and changes in system state that depend on previous states. Therefore, the research aims to see the suitability of the Fuzzy Time Series Markov Chain for predicting daily rainfall in Cilacap Regency. The method is suitable for predicting rainfall data for Cilacap Regency. The accuracy value in this study can be seen from the RMSE and SMAPE values ​​on the training data (in-sample), respectively, which are 58.76469 and 0.7227493. Meanwhile, the testing data (out sample) was 56.01818 and 0.7055117.</p> 2024-01-24T00:00:00+07:00 Copyright (c) 2024 Laura Sari, Annisa Romadloni, Rostika Listyaningrum, Fadhilla Hazrina Sistem Informasi Manajemen Legalisir Online Berbasis Website 2024-01-28T01:10:18+07:00 Dairoh Dairoh Riszki Wijayatun Pratiwi Dwi Intan Af’idah Sharfina Febbi Handayani Ferian Andhika Toarsi <p>Management and submission of legalization at the Harapan Bersama Polytechnic have not been computerized. The legalization process is carried out face-to-face by leaving legalized documents and returning them when the legalized documents are ready. This process is problematic because going to campus requires quite a long time, and there is no certainty or travel history from the management of legalized documents. The research objective is to build a legalization system to facilitate the process of implementing legalization in BAA units using the website-based waterfall method. This system validates alumni data in the form of NIM at registration, processes payments through payment gateways, pays for selected shipments, and tracks travel history from the submitted legalized documents. This system is called Simaleja, and there are two actors involved. As a result, the system runs according to the functions of the actors involved and has been tested. As for the results of the black box (actor) test, the system has been running according to the function of each actor, and the UI/UX usability results were obtained for 38 users, 82% of whom fall into the very good category.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-24T17:42:24+07:00 Copyright (c) 2024 Dairoh Dairoh, Riszki Wijayatun Pratiwi, Dwi Intan Af’idah, Sharfina Febbi Handayani, Ferian Andhika Toarsi Pengembangan Aplikasi Telemedicine Carevul Sebagai Optimalisasi Pelayanan Kesehatan Berbasis Cloud 2024-02-06T11:09:20+07:00 Nurul Ismawati Egia Rosi Subhiyakto <p><span style="font-weight: 400;">Telemedicine is a healthcare service that utilizes information and communication technology to offer virtual medical services, eliminating the need for the physical presence of patients and medical professionals in a single location. The development of telemedicine enhances the accessibility of healthcare services, helps overcome constraints of time and resources, and can reduce healthcare service costs. Consultation services at UPT Puskesmas Tirto Kota Pekalongan are still manual and have not fully optimized the use of technology. The process of meeting the needs for consultations with doctors requires a direct visit to the health center, resulting in a significant use of time and resources. Therefore, a website-based system is needed as a platform to provide easy and practical online telemedicine consultation services. This research employs the prototyping development method, allowing users to participate by evaluating and providing feedback during the development process. System testing using Blackbox and User Acceptance Test (UAT) shows a user satisfaction percentage of 89.6%, indicating that the majority of users strongly agree with the developed website. The development of this website is expected to facilitate users and medical personnel in conducting online consultations anywhere and anytime without the need to visit the&nbsp;health&nbsp;center.</span></p> 2024-01-26T15:14:54+07:00 Copyright (c) 2024 Nurul Ismawati, Egia Rosi Subhiyakto Analisis Desain Boom, Arm, dan Bucket Alat Peraga Mini Excavator Zhugimada dengan Metode Elemen Hingga 2024-01-28T01:10:18+07:00 Braam Delfian Prihadianto Suryo Darmo Dani Anggoro Hasan Suhada Nur Esa <p>An excavator is heavy equipment with a hydraulic system as the main drive and along with its uses, many parties have developed it as a means of production and as a means of learning. The education world needs excavators as learning tools and practice media are currently constrained by price when commercial units are used. Therefore, a learning media that is more compact but does not abandon the main essence of learning is needed. This research aims to analyze the front attachment design of the Zhugimada mini excavator using the finite element method. The research was carried out using the ANSYS application for the static load simulation process and testing was carried out with a bucket containing sand weighing 25 kg and using three hydraulic cylinders. The simulation results show that the maximum von Mises stress value in the bucket component is 43.226 MPa and the maximum deformation is 0,51285 mm in the tooth bucket so in general the design of the Zhugimada mini excavator front attachment components can be declared safe and can be continued in the fabrication process.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-26T16:28:52+07:00 Copyright (c) 2024 Braam Delfian Prihadianto, Suryo Darmo, Dani Anggoro Hasan, Suhada Nur Esa Rancang Bangun CNC Router 3 Axis Ukir Kayu Untuk Kerajinan Kaligrafi 2024-05-29T15:07:37+07:00 Sugeng Dwi Riyanto Muhamad Yusuf Riyani Prima Dewi Robbihim Nurdiansyah <p>The Indonesian wood industry is diverse, with wood carving being one of its most popular products. However, the manual wood carving process is not suitable for large-scale production. To address this challenge, a new tool has been developed to increase the production of wood crafts, especially calligraphy carving. This tool is a 3-axis wood carving CNC router machine controlled by a computer and smartphone. The CNC router machine was designed using the CNC Shield V3 and the Arduino Uno R3 motor driver, A4988 as a stepper motor controller. The mechanism applied includes creating vector images programmed with gcode, controlling and engraving calligraphy through software on computers and applications on smartphones with Bluetooth HC – 05 communication with a maximum distance of smaller than 10 meters. Based on control data by computer testing geometry testing circle dimensions of 58 mm x 56 mm and feed rates of 5 mm/sec, 8 mm/sec and 10 mm/sec with engraving times of 01:12, 00:48 and 00:42. Testing Muhammad's carving with dimensions of 100 mm x 100 mm and feed rates of 5 mm/sec, 8 mm/sec and 10 mm/sec with engraving times of 05:22, 03:45 and 03:24. Tests for cutting 12 mm thick MDF wood with a depth 1.5 mm and a feed rate of 5 mm/sec cuts 8 rounds for 13:12 min/sec. The control data by smartphone testing the geometry of the circle with dimensions of 50 mm x 50 mm and a feed rate of 500mm/min with a carving time of 58:43 minutes. Testing Muhammad's engraving dimensions of 70mm x 60mm and feed rates of 500 mm/min, 800 mm/min, and 1000 mm/min with engraving times of 54:34, 39:25, and 35:28. The test for cutting 12 mm thick MDF wood with a depth of 1.5 mm and a feed rate of 500 mm/min-cut 8x rounds for 10:21 minutes/second.</p> 2024-01-27T04:10:35+07:00 Copyright (c) 2024 Sugeng Dwi Riyanto, Muhamad Yusuf, Riyani Prima Dewi, Robbihim Nurdiansyah Analisis Penambahan Methanol 5%, 10% dan 15% Terhadap Torsi, Daya dan Exhaust Gas Temperature (EGT) Mesin Bensin 150 CC Berbahan Bakar Pertamax 2024-05-29T15:07:25+07:00 Faqih Fatkhurrozak Firman Lukman Sanjaya Syarifudin Amin Nur Akhmadi Nur Aidi Ariyanto Gunawan <p>Indonesia is one of the countries that uses the most motorized vehicles, which increases air pollution and fuel crises. Using biofuel is one solution to overcome this problem. Methanol is used as a mixture of Pertamax to produce environmentally friendly and renewable biofuel. This is because methanol has high octane and oxygen. Mixing methanol in Pertamax was carried out to analyze the impact of Torque, Power, and Exhaust Gas Temperature (EGT) of a 150cc petrol engine. Methanol 5%, 10%, and 15% was mixed into Pertamax with engine speed variations of 1000, 2000 and 3000 rpm. Dynotest is used to measure engine performance and thermocouples to measure EGT. Test results show the highest increase in engine torque and power of up to 25% at a speed of 2000 rpm with the PM15 mixture compared to P100. The highest reduction in EGT value occurred when using the PM15 mixture at a speed of 1000 rpm up to 28% compared to P100. This shows that the addition of methanol to Pertamax increases torque and power and reduces the EGT of the gasoline engine.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-27T04:31:34+07:00 Copyright (c) 2024 Faqih Fatkhurrozak, Firman Lukman Sanjaya, Syarifudin, Amin Nur Akhmadi, Nur Aidi Ariyanto, Gunawan Pemetaan Lokasi Evakuasi Bencana Alam Tsunami dengan Virtual Reality 360 Derajat 2024-05-29T15:07:48+07:00 Agus Susanto Santi Purwaningrum Annas Setiawan Prabowo <p>The rapid development of information technology is encouraging innovation in various fields, including in the field of geographic disaster information services. The tsunami natural disaster is a serious threat to Cilacap district which has a fairly long coastline. When a natural disaster occurs, the first thing that victims of a natural disaster must do is take cover and look for the location that is considered the safest to save themselves. To increase community preparedness for potential tsunami risks, this research aims to develop evacuation location mapping using virtual reality technology in a 360 degree format specifically in Cilacap district. This research method has 2 stages, namely the literature study stage and the system development stage. The literature study stage begins with conducting direct observations and interviews with the Cilacap Regency BPBD. Meanwhile, the second stage is the system development stage which will be carried out using the extreme programming method which includes planning, designing, coding and system testing activities by implementing the System Usability Scale (SUS) method. The result of this research is an application for mapping natural disaster evacuation locations with the test results using the SUS method getting a score of 81. The practical implication of this research is that it can be a basis for related parties to design and implement more effective disaster mitigation strategies in Cilacap district.</p> 2024-01-27T00:00:00+07:00 Copyright (c) 2024 Agus Susanto, Santi Purwaningrum, Annas Setiawan Prabowo Analisis Pengaruh Variasi Suhu Tempering Pada Sifat Mekanik Baja ASTM A36 Setelah Pengelasan SMAW Menggunakan Elektroda E 7016 2024-02-03T05:22:15+07:00 Leo Van Gunawan Puger Satya Andika Tito Endramawan Emin Haris Casiman Sukardi Unggul Satria Jati <p><span style="font-weight: 400;">ASTM A36 is a type of structural metal that can be applied for various purposes such as making gears, bridge structures and ship buildings. After welding, ASTM A36 steel will produce residual stress. Residual stress in the welded metal is caused not balanced temperature distribution. The method for eliminating residual stress is tempering. Tempering is used to reduce residual stresses, increase the ductility and toughness of metals. This research aims to analyze the effect of variations in tempering temperature on the mechanical properties of ASTM A36 steel after SMAW welding using E7016 electrodes. The tensile strength test on the specimen showed the highest increase due to the tempering effect of 537,880 MPa at a temperature of 200°C. This is proven by the reduction in material hardness of 165.07 VHN at a tempering temperature of 200°C when compared to the hardness of the raw material. The growth of ferrite grains in the material structure shows that the ASTM A36 material is increasingly ductile after tempering. The results of research on the effect of variations in tempering temperature on the mechanical properties of ASTM A36 can be used as an alternative way to increase ductility after the welding process</span></p> 2024-01-27T00:00:00+07:00 Copyright (c) 2024 Leo Van Gunawan, Puger Satya Andika, Tito Endramawan, Emin Haris, Casiman Sukardi, Unggul Satria Jati Studi Kelaikan Tower BTS Berdasarkan Sudut Kemiringan, Kekencangan Baut, Kekuatan Beton Serta Pengukuran Ground 2024-05-29T15:06:49+07:00 Vicky Prasetia Arif Sumardiono Sugeng Dwi Riyanto Muhamad Yusuf <p>Telecommunication Network Tower is a tower made of a series of iron profiles or rectangular or rectangular pipes, or rectangular long pipes intended to accommodate antennas and radio transmitters and receivers of telecommunications and information waves. In principle, BTS towers have the function of connecting network user communication devices to other networks. To support the smooth operation of the network, the building will remain solid and secure for a certain period. Investigation of the feasibility condition of the tower structure is very important to determine the overall condition of the tower structure. The methods used are <em>hammer test</em>, check bolt tightness (torque), measure slope (vertical), grounding, and visual observation. From the results of the test data obtained the average bolt tightness is 432.86 Nm. The tower slope test of 1.90 cm on leg A smaller than 3.6 cm is considered good because it is still within the tolerance limit of the bat slope, the average soil resistance measure smaller than1 ohm used is very good, and the visual physical conditions are very similar, so it can be done Tower in safe and working condition</p> 2024-01-27T23:16:53+07:00 Copyright (c) 2024 Vicky Prasetia, Arif Sumardiono, Sugeng Dwi Riyanto, Muhamad Yusuf Inspeksi Sambungan Rangka Mobil Listrik Tipe Tubular Space Frame Menggunakan Las GMAW dengan Cairan Liquid Penetrant 2024-01-29T13:53:15+07:00 Unggul Satria Jati Dian Prabowo Hety Dwi Hastuti Leo Van Gunawan <p><span style="font-weight: 400;">Technological developments increasingly require humans to increase their competence and innovation. The process of making frames for electric cars is one of the innovations to produce a strong frame. The frame is the main and important part of a vehicle, because the components and passengers will support the frame. The connection between frame components uses GMAW welding, which is the process of joining metal materials by heating them until they reach their melting point. To obtain a frame that meets the criteria, it is necessary to carry out a testing process, this testing process is NDT testing (Non Destructive Test), namely testing the physical part of the material in a way that does not damage the test object. Meanwhile, the aim of this research is to inspect the electric car frame so as to find discontinuities in the GMAW welding results. The results of this research were that there were 22 samples that underwent the liquid penetrant test process, of the total samples according to ASME Section VIII Division 1 Mandatory Appendix 6 there were 14 specimens that were acceptable while 8 needed improvement in the connection process. After the repair or repair process has been carried out, the frame is declared fit for use.</span></p> 2024-01-27T00:00:00+07:00 Copyright (c) 2024 Unggul Satria Jati, Dian Prabowo, Heti Dwi Hastuti, Leo Van Gunawan Perancangan Skema Dual Port Injection Sistem Electric Control Unit Motor Spark Ignition 2024-05-29T15:07:13+07:00 Syarifudin Kusnadi Eflita Yohana Suhartana Faqih Fatkhurrozak Firman Lukman Sanjaya <p>Blending fuels is an urgent alternative to reduce dependence on gasoline. Blending gasoline-alcohol bioethanol is realistic due to its high octane number properties and the abundant availability of raw materials. However, high viscosity results in inconsistent fuel mixing homogenization and decreased injector performance. The research aims to design a Dual Port Injection scheme as a dummy simulation of fuel blending so that bioethanol alcohol can be homogeneously blended with gasoline in the combustion chamber. The method used is observation of the Electric Fuel Injection working system and designing a Dual Port Injection Scheme. The research resulted in a Dual Port Injection scheme with the concept of doubling the injection-based fuel system and commands from the commercial Electric Control Unit to be forwarded to the bioethanol and bioethanol fuel pumps to supply fuel to the high pressure pipe.</p> 2024-01-27T22:22:24+07:00 Copyright (c) 2024 Syarifudin, Kusnadi, Faqih Fatkhurrozak, Firman Lukman Sanjaya Perbandingan Kinerja Antara Gatling dan Apache JMeter pada Uji Beban RESTful API 2024-05-29T15:07:01+07:00 Prih Diantono Abda'u Agus Susanto Abdul Rohman Supriyono Dwi Novia Prasetyanti <p>This research explores and compares the performance of two popular load testing tools, namely Gatling and Apache JMeter, with a focus on API performance testing. The rapid growth in web and mobile application development highlights the urgent need to ensure optimal API performance. This research was conducted to provide in-depth insight into the advantages and disadvantages of these two testing tools through the use of similar testing scenarios. The experimental method involves implementing test scenarios that include load variations and high demands on both devices. The main parameters observed include API response time, throughput, and latency. In-depth analysis was carried out on the data obtained to evaluate the reliability and efficiency of each tool. The results of this research provide a comprehensive understanding of the performance of Gatling and Apache JMeter in the context of API performance testing. These findings can provide practical guidance for software developers and testing practitioners in selecting load testing tools that suit their project needs. Recommendations for future research include expanding exploration of other load testing tools, comparison with more complex test scenarios, and integration with performance monitoring tools for more holistic analysis. Thus, this research is expected to make a significant contribution to the understanding and selection of effective load testing tools in web and mobile application development.</p> <p><span style="font-weight: 400;">&nbsp;</span></p> 2024-01-27T22:56:42+07:00 Copyright (c) 2024 Prih Diantono Abda'u, Agus Susanto, Abdul Rohman Supriyono, Dwi Novia Prasetyanti