Infotekmesin 2022-10-04T14:08:41+07:00 Dr. Eng. Agus Santoso Open Journal Systems <p align="justify"><strong>INFOTEKMESIN </strong>is a peer-reviewed open-access journal with e-ISSN <strong><a href=";1564733309&amp;1&amp;&amp;" target="_blank"> 2685-9858</a> </strong>and p-ISSN: <strong><a title="ISSN" href=";1339729931&amp;1&amp;&amp;" target="_blank">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.</p><p align="justify"><span>The editors will only accept the manuscripts which meet the assigned format. Please submit your manuscript and Download the template</span> <a style="font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif; font-size: 12px;" href="" target="_blank"><strong>HERE</strong></a><strong></strong><strong></strong><strong></strong></p><p align="justify"><strong>Jurnal <strong>INFOTEKMESIN</strong> has been accredited as a scientific journal by the </strong><strong><span>Ministry of Research and Technology/National Research and Innovation Agency</span> Republic of Indonesia: <span><a href="" target="_blank">SK-AKREDITASI No.200/M/KPT/2020 (SINTA 3)</a>. </span></strong></p><ul><li><strong><span>Certificate of accreditation can download <a href="" target="_blank">HERE</a><br /></span></strong></li></ul><p align="justify"><strong><span><br /></span></strong></p> Pengembangan Model Pembangkit Listrik Tenaga Picohydro Tipe Turbin Cross Flow Head Rendah 2022-10-03T22:12:09+07:00 Gun Gun R Gunadi Jusafwar Candra Damis Widiawaty Machfud Priyo Utomo Ramdana Ajie Satria Muhammad Raihan Abimanyu Adi Syuriadi Dianta Mustofa Kamal Rosidi <p>The provision of food, energy supply, and the provision of information are The food provision, energy supply, and information delivery are controlled to improve people's welfare. In 2011, the national electricity production by PLN was 11% new and renewable energy. 6% hydropower and 5% geothermal. PLN plans the geothermal to be 13% and hydropower to be 6%. The availability of independent PhPP has been built by many communities. PhPP with a waterwheel drive provides a capacity of about 100 watts thus it is only enough for home lighting, whereas the hydro energy potential of the area is quite abundant. The development that has been carried out has several weaknesses; PhPP plump turbine type requires a high head which becomes a constraint for agricultural irrigation, in the other hand PhPP waterwheel type has low efficiency. The research was conducted to develop PhPP low head cross-flow turbine type, which is more efficient. The development begins with the experiment of the PhPP cross-flow turbine model to optimize the ratio of the diameter and width of the runner. A preliminary case study provides experimental results for a cross-flow turbine's torque and power parameters at a flow rate of 0.053 m3/s. Changes in the turbine diameter and width ratio are optimum at a runner width of 10 cm.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Performa Metode Klasifikasi Tunggal dan Ensemble Model dalam Identifikasi Baku Mutu Air 2022-10-03T22:22:55+07:00 Prasetya Widiharso Siti Sendari Anik Nur Handayani Nastiti Susetyo Fanani Putri <p>Water quality classification for the needs of recreational facilities, livestock, fisheries, and plantations is needed to determine utilization based on water quality according to national water quality standards. The methods used in this research are K-Nearest Neighbors (KNN), Support Vector Machine (SVM), Naïve Bayes (NB), and Ensemble Model. The parameters measured consisted of temperature, TDS, TSS, pH, COD, BOD, DO, and rainfall. The main objective of this research is to discover the performance of a single classification method and ensemble model on data types with unbalanced class distributions. Classification objects are divided into two classes. First, is the class for the designation of recreational facilities, fisheries, and livestock. Second, the class for the allotment of crop cultivation. The test results of the application of the KNN obtained 86%, SVM obtained 87%, and NB obtained 90.57%. Meanwhile, through the ensemble model, the results obtained are 94.43% Bagging Classifier, 94.96% Gradient Boosting Classifier, and 95.94% Adaboost Classifier</p> 2022-07-30T00:00:00+07:00 Copyright (c) Rancang Bangun Mesin Pencacah Rumput dan Pelepah Kelapa Sawit dengan Penggerak Motor Bensin Sebagai Pakan Ternak 2022-10-03T22:30:01+07:00 Hasbi Assiddiq S Asrul Pratama Hermanto <p>In increasing cattle productivity by using the cage method, adequate feed availability is needed. Farmers in Mandala Village still use the traditional method of chopping feed during the process of providing feed, which requires a lot of energy and time. The purpose of this research is to make a chopping machine for animal feed and to find out the results of the machine chopping. The method used is observation, literature review, experimental method, and design method. The grass chopper machine as a result of the research has a chopping chamber size of 360 x 360 x 490 mm, blade 270 x 50 x 10 mm, with a gasoline motor drive of 5,5 HP, transmission pulley, and V-belt type A-45. The chopping results obtained were 5,75 kg of palm fronds and leaves, 19,25 kg of trees and banana leaves, and 5 kg of grass in the chopping time of 02.00 minutes each at an average engine speed of 2100 rpm with the size of the chopped results between 3-6 cm</p> 2022-07-30T00:00:00+07:00 Copyright (c) The Legend of Archer : Role Playing Game Untuk Anak-Anak Berbasis Mobile 2022-10-03T22:35:13+07:00 Ilham Hanif Pamulia Slamet Wiyono Sharfina Febbi Handayani <p>Game is a part of the entertainment that is made as attractive as possible and can be played using electronic media. The development of games in Indonesia has given rise to a new genre in the form of Role Playing games (RPG) which is currently very popular with children, where players play the role of characters in fictional settings. Currently, there are many games that are played by children, but not many provide knowledge about the hero characters of Indonesian puppet characters. This study aims to develop a mobile-based game about wayang characters, especially Arjuna characters who can train children's ability to solve problems, train creativity and form an unyielding optimistic attitude when completing all levels of The Legend Of Archer Game. This game development method uses stages starting from problem identification, data collection, data analysis, system design, system creation, implementation, and testing.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Pengaruh Variasi Media Pendingin Proses Quenching Terhadap Mikrostruktur dan Sifat Mekanik Baja Hadfield 2022-10-03T22:39:06+07:00 Ilham Azmy <p>Manganese steel contains 1,2% C and 12% Mn generally recognized as Hadfield steel. Based on the high composition of C and Mn elements, the main structure of this steel is dominated by an austenite matrix that surrounded the carbide phase on the grain boundary.&nbsp; This structure is usually brittle which leads to improper high-loading conditions. To overcome this problem, the experimental method was carried out by heating Hadfield steel to a temperature of 1000 oC, then followed by a quenching process using cooling media variations namely water and salt bath (20 wt.% NaCl solution). These cooling media variations aim to determine the level of carbide formation which affects the microstructure and mechanical properties. From the test results, it was obtained that Hadfield steel with salt bath (20 wt.% NaCl) quenching variation has significant microstructure transformation which affects enhancement of the value of tensile and yield strength (809,5 and 542,4 MPa), hardness (238 HV), ductility and toughness.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Effect of Cutting Parameter Toward The Surface Roughness Applied In Turning Tool Steel Material 2022-10-03T22:44:55+07:00 Gatot Setyono Slamet Riyadi Muharom Ong Andre Wahyu Riyanto Sigit Pratama <p>In this study, the effect of the tool-tip radius and cutting process parameters on the quality of the machining process experimentally on the use of SKD 11 tool steel material. Several radius (0.80 mm, 1.20 mm, 1.60 mm) and the parameters of the cutting process, specifically feed rate, cutting speed, and depth of cut. The ANOVA method used in this study aims to analyze the cutting process parameters on the surface quality of the workpiece and the cutting force. The analysis of this research results in certain conditions in which the feed rate significantly affects surface quality. However, this is contrary to the depth of cut parameter, which affects the cutting force. This study also observed the effect of the tooltip radius on the optimal surface quality when using a 0.80 mm radius. The second-order regression modeling used in this analysis shows a very good level of accuracy, with the correlation value of accuracy ranging from 96% to 98%.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Studi Pendahuluan Sistem Akuakultur Cerdas Berbasis Online Monitoring Terhadap Unjuk Kerja Kincir Aerasi 2022-10-03T22:51:42+07:00 Muh. Anis Mustaghfirin Priyambodo Nur Ardi Nugroho Dwi Sasmita Aji Pambudi Eky Novianarenti <p>This article discusses a preliminary study of developing a paddlewheel aerator for shrimp ponds using an integrated intelligent aquaculture system to support intensification. Two paddlewheel aerators with different phases have been successfully installed. The test was carried out on two different types of motors, which were intended to comprehend the performance of every motor on a paddlewheel aerator. The ratio of the speed values for a single-phase motor was 102 rpm and for a 3-phase motor was 110.3 rpm. The data from the performance observation of the aeration wheel motor can be viewed via a smartphone using a website application. The data displayed from the observations are in the form of data on voltage, current, frequency, power, power factor, and the power generated by the pinwheel motor. The test results show the performance of the aeration wheel motor that works under normal conditions with an average measurement error of 0.23%, below the acceptable error limit of 0.5%. This research forms the basis for a smart aquaculture system that can be developed domestically to support local industries in Indonesia.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Uji Eksperimental Efisiensi Panas Alat Pengering Surya Langsung Pasif Berbiaya Murah dengan Variasi Material Penutup Transparan 2022-10-03T22:58:49+07:00 Kemas Muhammat Abdul Fatah Indriyani Ari Beni Santoso <p>Indonesia should be able to provide inexpensive solar dryers due to the availability of sunlight all year round throughout the country. This study proposes a passive direct solar dryer as it is the simplest one to construct, with aluminum mesh sheets as a heat-absorbing material, and glass fiber as an insulating material. For the cost-effective transparent cover, this study proposes 0.8 mm clear polycarbonate (PC), 2 mm clear glass, and 2 mm clear acrylic. The experimental test results of the solar dryer model showed that the highest heat efficiency value for polycarbonate (PC) is 16%, whereas the heat efficiency value for glass and acrylic is 10% and 8%, respectively. Through these findings, the construction of solar dryers is simple and low cost by using glass fiber as insulation, aluminum mesh sheets as heat absorbers, and PC instead of thin glass as transparent covers.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Implementasi Profile Matching Pada Seleksi Ketua dan Wakil Ketua OSIS 2022-10-03T23:04:14+07:00 Alif Iftitah Linda Perdana Wanti Dwi Novia Prasetyanti Nur Wachid Adi Prasetya Andriansyah Zakaria <p>The OSIS chairman is the highest leader in the OSIS management structure and is accompanied by a vice-chairman. Therefore, a selection with several criteria is needed to determine the best candidate. Things that are considered in this selection are realism, maturity, organizational experience, public speaking, discipline, character, organizational activity, and responsibility. By utilizing a decision support system, the best candidates are obtained for the candidate for chairman and vice-chairman of the student council. This system is made with the method used to assist the selection process, namely, profile matching. Profile matching is used to find the profile of a job that is sought from a predetermined specification. This method provides a solution and has a clear objective in decision-making. On the other hand, the method used to develop a decision support system is the incremental method. The selection of the incremental method is based on the fact that this method has an iterative nature, which can adapt to the many repetitions that occur during the development process. The novelty of this research is the recommendations generated from the developed decision support system. There are notifications about the results of decisions to users, in this case, the candidates for the OSIS chairman and vice chairman who are alternatives in the election process. This study resulted in recommendations in the form of candidates for OSIS chairman and vice chairman by the candidate's profile.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Implementasi Manajemen Pengetahuan Pada Perusahaan Web Hosting Dengan Web Hosting Management Complete Solution 2022-10-03T23:08:00+07:00 Angga Pramudianto Christina Juliane <p>The implementation of knowledge management in a company has become a necessity in the current 4.0 era. Therefore, the company's ability to manage existing knowledge is needed to survive the onslaught of competition. To implement knowledge management in one of the Web Hosting companies towards service to consumers is the aim of this research, as well as a solution to the problems experienced in the Customer Support division. Due to this, the problem-solving process is often hampered and the existing problems are not properly archived. In this study, knowledge of the organization is figured out by analyzing the support of existing information technology. Focus Group Discussion (FGD) method is used as a tool to find out the abilities and skills that exist in each of them, in order to figure out the extent to which a person's perspective is to see and assess something he observes. In this study, Web Hosting Management Complete Solution (WHMCS) is a system used in applying knowledge to web hosting companies for the knowledge-sharing process between customer support and consumers.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Analisis Kinematik Singularty Pada Manipulator 7 DOF Dengan Software Simulasi ROBOAnalyzer 2022-10-03T23:13:37+07:00 Nur Akhlis Sarihidaya Laksana Radhi Ariawan Unggul Satria Jati Jenal Sodikin Ulikaryani <p>Studies related to manipulators are still being carried out, along with the times and needs. Utilization in manufacturing and fabrication has led to the development of many manipulators. Smooth, fast, and accurate movement continue to be developed. In the case of the multi manipulator, 7 DOF (Degree of Freedom) is a type of manipulator that has special features in terms of joints. Inverse kinematic is a parameter used to control the orientation and movement of the manipulator. 7 DOF has three singularity wrist, elbow, and shoulder. In the simulation, each singularity produces an inverse kinematic matrix which is used to control the movement of the manipulator. The method used is to determine the angle of motion of the joint (continues joint angel) with simulation to produce calculations that are fast, precise, accurate, and stable. The target of each joint with the theta value that has been determined by the singularity was successfully carried out with an error of 0%.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Desain Alat Smart Farming Penyiram Bawang Merah Menggunakan Arduino Uno Berbasis Android 2022-10-03T23:19:36+07:00 Novta Dany’el Irawan Shafiq Nurdin Muhammad Athoillah Riski Nur Istiqomah Dinnullah <p>One of the technological developments in agriculture is smart farming. Shallot farmers still carry out the process of watering shallot plants manually. This takes a long time because farmers have to go around the agricultural land during the watering process. To solve these problems, an automatic shallot sprinkler machine was designed that can be applied by farmers. The Arduino Uno ATMega328 microcontroller is used on this machine as the control system, while Android is used for the interface. The android interface on this machine can provide a graphical display, therefore farmers can give direct orders to drive a DC motor (Direct Current) and a DC pump on/off switch (Direct Current). The results of the smart farming research on this automatic onion sprinkler help farmers get 72% efficient time. The comparison can be seen in the manual watering process on 10,000m2 agricultural land that takes 7 days, on the other hand, it only takes 2 days when it is done with smart farming technology.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Analisa Pengaruh Kecepatan Putar Motor DC Terhadap Jarak Lontaran Pelet Pada Mesin Pelontar Pakan Ikan 2022-10-03T23:23:24+07:00 Arief Adimas Prayoga Ah. Sulhan Fauzi <p>Freshwater fish is a type of fish that is very popular with the wider community. The problem that often occurs in cultivators is the timing of feeding fish. This study introduces automatic pellet sowing with a DC motor as a pellet ejector. The method used is by identifying research variables. This research was conducted with 3 variations of DC motor rpm rotation with 2 different pellet sizes. The data obtained showed that the farthest ejection distance is 3 mm pellets with a rotational speed of 6000 rpm, while the closest ejection distance is 3 mm pellets with a rotational speed of 1000 rpm, and it is also concluded that the data findings are the estimated time to run out of 3 kg of pellets for each pellet sample with three variations of DC motor rotational speed. Pellets with the fastest time of 1.90 s are pellets with a size of 3 mm with a rotational speed of 6000 rpm, while the longest time is 5.2 s, namely pellets with a size of 1 mm with a rotational speed of 1000 rpm.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Uji Kinerja Metode Deep Convolutional Neural Networks Untuk Identifikasi Gangguan Daya Listrik 2022-10-03T23:26:21+07:00 Sunneng Sandino Berutu <p>The identification model development of the power disturbance signals with the deep convolutional neural networks (CNNs) method involves a large amount of data. However, the real signal data is limited. Therefore, researchers employ synthetic signal data. These signals can be generated by the formula IEEE standardized. In these formulas, two categories have a similar formula i.e interruption and sag. The difference is only in the intensity parameter (α). This paper analyzed the model performance of identifying those disturbances where the intensity values are set differently for training and testing datasets based on the upper bound value α of sag and the lower bound value α of interruption. Several noise levels are included in the signals. So, there are several datasets with noises in this simulation. Furthermore, those datasets are trained using the model based on deep CNN. The test results show that the true positive (TP) of the model's performance in identifying the interruption signal is 93.54% and the sag signal is 78.78%. In addition, the performance of the model using a dataset without noise obtained a high percentage in accuracy, precision, and f1-score parameters with 92.4%, 97.4%, and 92,76%, respectively.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Pengaruh Exhaust Gas Recirculation (EGR) Terhadap Exhaust Gas Temperature (EGT) dan Smoke opacity Mesin Diesel 4JB1 Berbahan Bakar Biodiesel Jatropa-etanol 2022-10-03T23:31:42+07:00 Syarifudin Faqih Fatkhurrozak Firman Lukman Sanjaya Ahmad Farid <p>Human dependence on motorized vehicles is getting higher and uncontrollable. This actualization will certainly have an impact on reducing fuel stocks and air pollution with soot emissions. Combining diesel fuel with jatropha and alcohol is predicted to reduce dependence on diesel fuel and air pollution. Supplying the combustion chamber with exhaust gas/Exhaust Gas Recirculation/EGR is also predicted to reduce soot emissions and reduce fuel consumption. This study aims to observe the effect of using the EGR system on the use of mixed fuel jatropha and ethanol exhaust gas temperature/EGT as an indication of performance and soot/smoke opacity as exhaust emissions. The experimental results show the use of the EGR system increases EGT and Smoke opacity decreases the diesel engine in each fuel variation. D100 fuel EGT increased 1.67%, DJ10 increased 0.71%, DJ10E increased 0.67%, DJ20 increased 1.45%, DJ20DE increased 1.07%, DJ30 increased 1.50%, and DJ30E fuel EGT increased by 1.47%. While on the emission side, the smoke opacity of D100 fuel decreased by 1.84%, DJ10 decreased by 1.71%, DJ10E decreased by 2.21%, DJ20 decreased by 0.96%, and DJ20E decreased by 2.33, DJ30 decreased by 2.99%, and DJ30E fuel decreased 1.30%.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Uji Eksperimental Emisi Gas Buang Mesin Bensin 160 cc Berbahan Bakar Campuran Pertalite-Butanol dan Pertalite-Diethyl Ether (DEE) 2022-10-03T23:36:15+07:00 Firman Lukman Sanjaya Syarifudin Faqih Fatkhurrozak Nur Aidi Ariyanto <p>Air pollution is increasing due to the high exhaust emissions of motorized vehicles using fossil fuels. The solution is the use of alternative energy. Butanol and Diethyl Ether (DEE) are alcohols that can be used as a fuel mixture and are environmentally friendly. This is because butanol and DEE have high oxygen levels so the oxidation process in the combustion chamber increases and the residual gas results from combustion is better. This study tested the residual gas from the combustion of a 160 cc gasoline engine using a mixture of pertalite-butanol and pertalite-DEE fuels with 5%, 10%, and 15% alcohol percentages. The test results show that adding DEE produces better engine exhaust emissions than adding butanol. CO emissions decreased by 87% using DEE15 while B15 reduced CO by 72%. DEE10 improves HC by 73% while B15 improves HC by 72%. However, DEE15 increases CO2 by 17% and B15 by 11%. Meanwhile, the oxygen content increased by 8% in DEE15 and 6% in B15 compared to pure pertalite.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Pengembangan Perangkat Lunak Untuk Deteksi DDoS Berbasis Neural Network 2022-10-04T14:08:41+07:00 Arif Wirawan Muhammad Muhammad Nur Faiz Ummi Athiyah <p>System security issues are a vital factor that needs to be considered in the operation of systems and networks, which will later be used for disaster mitigation and preventing attacks on the network. Distributed Denial of Services (DDoS) is a form of attack carried out by individuals or groups to damage data through servers or malware in the form of flooding packets, therefore it can paralyze the network system used. Network security is a factor that must be maintained and considered in an information system. DDoS can take the form of Ping of Death, flood, Remote control attack, User Data Protocol (UDP) flood, and Smurf Attack. This study aims to develop software to detect DDoS attacks based on network traffic logs. The software has been tested and run according to the neural network algorithm. This software was developed with an interface that makes it easier for users to detect the source IP whether the IP is carrying out a DDoS attack or normal.</p> 2022-07-30T00:00:00+07:00 Copyright (c) 2022 Evaluasi Sistem Pencahayaan Gedung Pendidikan Perkuliahan Sesuai Standar Nasional Indonesia (SNI) 2022-10-04T00:08:03+07:00 Vicky Prasetia Supriyono Purwiyanto <p>The lighting system is one of the aspects of assessing the function of the building. The building lighting system is included in the health aspect of the building. To achieve proper function, the building lighting system must meet the illumination value of each room according to the type of utilization in accordance with SNI 6197:2011, SNI 6197:2011, SNI 03-2396-2001, dan SNI 03-6575-2001. This study aims to analyze the lighting system in the Gedung Kuliah Bersama at the Politeknik Negeri Cilacap. This study uses a quantitative method by comparing the amount of light intensity based on field measurements, calculation results, and the SNI 6197:2011 standard. Based on the results of observations, data processing, and measurements, it was found that there were still some rooms in the Gedung Kuliah Bersama that did not meet SNI. Rooms that have fulfilled SNI include classrooms, library rooms, language laboratories, lecturer transit rooms, multipurpose rooms, terrace, and warehouses. It is necessary to carry out maintenance and repair of lamps for rooms that do not meet SNI. Maintenance and repair of lighting systems are carried out by replacing, adding, and/or repositioning lamps.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Exloratory Data Analysis Untuk Data Belanja Pelanggan dan Pendapatan Bisnis 2022-10-04T00:13:51+07:00 Widi Hastomo Adhitio Satyo Bayangkari Karno Sudjiran Dodi Arif Eka Sally Moreta <p>A more quantifiable perspective is assuming the role of mechanistic management in an effort to enhance business based on its capacity to transform data into knowledge and insight. The industry has not completely supported its business strategy also with driven data. Using a transaction dataset taken from one of the challenges, this experiment attempts to determine consumer spending patterns and Retail Fashion business revenues (H&amp;M Personalized Fashion Recommendations). The results of the experiment are the number of transactions based on customer age, the most sales product and one-time purchased item, and the type of product that generates the highest and smallest income. The approach employed is EDA using the Python language. In order for businesses to generate analytical findings that provide future perspectives and to help identify the gap by delivering analytical results in the form of suggestions that can be perpetuated, the findings of this experiment are intended to support the capabilities of simulation. The challenge in this experiment is the abundance of datasets, which necessitates a suitable operating environment.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Penerapan Metode First Come First Served (FCFS) Pada Sistem Informasi Layanan Perawatan dan Perbaikan Aset Kampus 2022-10-04T00:18:20+07:00 Riyadi Purwanto Linda Perdana Wanti Ratih Hafsarah Maharrani M.Kom Rostika Listyaningrum <p>Assets are resources owned by an entity. Cilacap State Polytechnic is a higher education institution that has many assets. Current asset maintenance and repair services are still carried out conventionally. Each work unit must fill out a maintenance and repair proposal form and then submit it to the Maintenance, Repair, and Maintenance Unit (UP3). The proposal will be recorded and scheduled to be followed up by the Technician. The problem that occurs is that the proposal form is often scattered and even lost so the response time is often slow. In addition, maintenance and repair schedules are often not ordered according to the time of the request. This has an impact on the abandonment of work in certain work units. The purpose of this research is to create an information system for the repair and maintenance of campus assets. In order for maintenance and repair services to be carried out according to the time of the request, the FCFS method is applied. Thus, the service process for maintaining and repairing campus assets becomes more organized, schedules (queues) are sequenced, and the response time for incident handling is faster.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Pengaruh Penggunaan Lapisan Phase Change Material Parafin Grafit Sebagai Pendingin Terhadap Efisiensi Panel Surya Polycrystalline 2022-10-04T00:22:58+07:00 Rovida Camalia Hartantrie Ryann Argadiraksa I Gede Eka Lesmana <p>Solar panels such as PLTS can be an alternative to complete electricity needs. However, the intensity and temperature of the sun that can not be adjusted are an obstacle to the use of solar panels. Continuous absorption of sunlight can cause solar panels to overheat. Therefore, it is necessary to cool the solar panels, therefore the heat absorbed does not exceed the capacity. Phase Change Material (PCM) paraffin graphite is one of the coolants for solar panels. PCM paraffin graphite was used to coat solar panels and then measured for voltage, current, and temperature. The results were compared with solar panels that were not covered with PCM paraffin graphite. The test results found that solar panels coated with PCM produced a lower surface temperature of 0.1458% than those without PCM. Meanwhile, the efficiency and power produced by PCM-coated solar panels were 19.496% and 0.02685% higher than solar panels without PCM, respectively, so the use of PCM paraffin graphite in solar panels can increase their efficiency.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Optimalisasi Hasil Produksi Briket Cangkang Kelapa Dengan Memanfaatkan Teknologi Tepat Guna Berbahan Bakar Minyak Solar 2022-10-04T00:37:56+07:00 Teuku Zulfadli Muhammad Kafrawi Misswar Abd <p>Many methods can be used by the community to burn coconut shells into charcoal, one of which is by utilizing appropriate technology fueled by diesel oil, namely shell powder processing machines. The production of briquettes from coconut shells is still limited and has not developed rapidly because the process of shelling coconut shells is still simple thus it takes three to five days. The use of adhesive amounts is not optimal. This is done to fulfill the community's desire; therefore, coconut shell waste can be managed as raw material for making briquettes to become a source of community income. The purpose of this research is to optimize the production of coconut shell briquettes by utilizing appropriate technology fueled by diesel oil. The method used is by conducting a trial process of starch adhesive treatment, namely 1%, 2%, 3%, 4%, 5%, 6%, 6.25%, and 7% with the amount of water 900 ml at a temperature of 70 0C to form gelatinization. As a result, it was found that the best starch adhesive treatment is in the 6.25% test with the ratio of the starch adhesive mixture, shell powder, and water being 0.25: 4: 0.9. It indicates that the resulting briquette shape is more efficient, has high density and small briquette pores.</p> 2022-07-30T00:00:00+07:00 Copyright (c) Penerapan Metode Waterfall Pada Aplikasi Tracer Study Berbasis Website 2022-10-04T00:43:26+07:00 Alina Mei Cahyaningtyas Riyadi Purwanto Prih Diantono Abda’u3 <p>Tracer study is a method used by several Vocational High Schools (SMK) to collect alumni data and monitor alumni progress. The problem is in monitoring the alumni who do not only stay in Cilacap but outside of the city as well. Moreover, the data collection method is still simple by only using a questionnaire form filled out when they take their diplomas. This condition is less effective because many alumni are still looking for a job, therefore it is difficult to check up on them all the time. This study aims to create a tracer study application using the waterfall method. The testing phase uses the Blackbox testing method. Based on the test results, the application can make it easier for BKK administrators to collect alumni data and help monitor the alumni progress by checking the percentage of alumni status and making it easier for alumni to fill out questionnaires. The results of the overall usability test conducted on 30 respondents resulted in the predicate "Very Good" with an average of 85.51%.</p> 2022-07-30T00:00:00+07:00 Copyright (c)