International Journal of Research in Vocational Studies (IJRVOCAS)
The International Journal of Research in Vocational Studies (IJRVOCAS) is a double-blind peer-reviewed journal. This journal provides full open access to its content on the principle that making research freely and independently available to the science community and the public supports a greater global exchange of knowledge and the further development of expertise in the field of vocational education and training (VET). IJRVOCAS is since the beginning independent from any non-scientific third-party funding. The establishment of the journal was supported between 2015 and 2016 with grants from the Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation). All members of IJRVOCAS work on an honorary basis. The journal is hosted by Ghalih Publishing and the publishing house of the Ghalih Academic. Scope IJRVOCAS covers all topics of VET-related research from pre-vocational education (PVE), initial vocational education and training (IVET) and career and technical education (CTE) to workforce education (WE), human resource development (HRD), professional education and training (PET) and continuing vocational education and training (CVET).
Articles
221 Documents
<![CDATA[Analysis of the Effect of Tapioca Flour Adhesive on the Characteristics of Palm Oli Empty Charcoal Briquettes ]]>
<![CDATA[Muhammad Anhar Pulungan]]>;
<![CDATA[Sihar Siahaan]]>;
<![CDATA[Siti Maretia Benu]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.156
<![CDATA[Palm oil solid waste such as oil palm empty fruit bunches (TKKS) if not processed can be explained by the environment. This study attempts to study the utilization of oil palm empty fruit bunches as charcoal briquettes. Charcoal briquettes are one of the alternative fuels to replace fuel gas and firewood charcoal. The empty sign of the oil palm is burned so that it becomes charcoal, then the charcoal is ground and sifted, after being sifted it is given a mixture of adhesive, namely tapioca flour. The mixed charcoal is put into a briquette press. The research was conducted on a laboratory scale with a carbonization process at a temperature of 500℃, carbonization time of 3 hours. The process of drying briquettes at a temperature of 100⁰C for 1 hour. Comparison of the composition of 1000 grams of empty oil palm fruit bunches with 20% tapioca starch adhesive. From the results of the study, the briquette values obtained were as follows: 4775.18 cal/g, 6.96% water, 9.18% ash content, and 84 minutes of burning time. The empty bunches of charcoal briquettes were tested according to the SNI No.1/6235/2000 standard, which is a minimum calorific value of 5000 cal/gram, a maximum water content of 8%, and an ash content of 8%. The parameters of water content and burn time have met the standard. The parameters of the ash content and calorific value of the samples taken and tested have not met the standard of SNI No.1/6235/2000. One of the steps that can be tried to improve the quality of the ash content and calorific value is to rearrange the composition of the adhesive.]]>
<![CDATA[Assessment of Grey Forecasting Model: Study Case for Electrification Rate in Indonesia from 2012 to 2021 ]]>
<![CDATA[Mufrida Zein]]>;
<![CDATA[Muhammad Ghalih]]>;
<![CDATA[Rina Pebriana]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.157
<![CDATA[In 2021, Indonesia was 99.45% electrified. That year's aim was 100%. Due of Indonesia's 17,000 islands, electrifying rural settlements is tough. Depending on network size and demand, Indonesia's energy mix varies, however it often includes coal. After adopting the Paris Climate Agreement, Indonesia vowed to increase renewable energy to 23% by 2025. Indonesia's renewable energy production has increased. The government expects coal to be important in coming decades. The GM (1, 1) model of Grey theory was used to estimate Indonesia's electrification rate from 2012 to 2021. The model's average residual error is above 5%, according to the calculation. Indonesia's electrification rate is expected to grow annually. According to the trials, the recommended technique boosts the forecasting accuracy of the original Grey models and gives Indonesia a helpful reference for designing the action plan.]]>
<![CDATA[Analysis of Tensile Strength on ST.37 Material with SMAW Welding Variations of SAE 10 Oil and Water Cooling ]]>
<![CDATA[Efrata Tarigan]]>;
<![CDATA[Alexander Sebayang]]>;
<![CDATA[Liwat Tarigan]]>;
<![CDATA[Benar Surbakti]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.158
<![CDATA[In welding work must pay attention to the suitability of the welding construction in order to achieve optimal results. For this reason, welding needs to pay attention to several important things including welding efficiency, energy savings, and of course low costs. The purpose of this study was to determine how the tensile strength of the ST 37 material welded by SMAW welding which was cooled with a variety of cooling media, oil and pure water. The research method used in this research is to use real experimental research methods (True Experimental Research). From the results of the study, it can be concluded that the highest Ultimate Stress (Tu) tensile strength value is when the material is cooled with oil media, where the highest value is 365.15 N/mm2, followed by water cooling media oil, where the highest value is of 347.75 N/mm2, and the lowest is without cooling media where the highest value is 343.35 N/mm2. This is due to the thermal cycle that affects the microstructure of the material, this is what causes the tensile strength of the material to increase when a cooling medium is applied to the ST 37 welding material.]]>
<![CDATA[Performance Test of 1500 cc Fuel Motorcycle Using Pertalite – Bioethanol Mixture Fuel on Exhaust Gas ]]>
<![CDATA[Nelson Manurung]]>;
<![CDATA[Muhammad Anhar Pulungan]]>;
<![CDATA[Billy Christian Manurung]]>;
<![CDATA[Enzo W. B Siahaan]]>;
<![CDATA[Sihar Siahaan]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.159
<![CDATA[The increasing world oil prices followed by the increasing demand for fossil fuels as well as the issue of the energy crisis and global warming which demands a better level of environmental quality have encouraged the government to take good policies in overcoming them. Currently the world has been thinking about alternative energy that can be used for diesel or otto motors. One of the alternative fuels developed is alcohol fuel. Alcohol is a type of hydrocarbon in which one of the hydrogen atoms is replaced by the hydroxyl radical OH. Many agricultural products in Indo-nesia have the potential to be developed as bioethanol. In this study, the effect of adding bioethanol on pertalite fuel will be studied. This is because pertalite is a fuel that is in accordance with the demands of automotive needs and developments. This study aims to determine the comparison of power, torque, and air-fuel ratio as well as to determine the comparison of the content of exhaust gas compounds tested on the Toyota Vios Limo 1500CC car using pertalite (E0) fuel, 10% pertalite-bioethanol mixture (E10). and 15% (E15), 20% (E20). The test results obtained that the calorific value of Pertalite fuel is 49411.98 kJ/kg, 10% gasohol has a value of 46764.82 kJ/kg, 15% gasohol has a value of 44262.82 kJ/kg, and then 20% gasohol has a val-ue of 45735.42 kJ/kg. The test results obtained an average torque and power per-formance of 10% gasohol fuel of 109.09 Nm and 71.73 HP. The highest air-fuel ratio in fuel but the table shows the highest air-fuel ratio in 15% gasohol fuel is 15.46 and then the lowest air-fuel ratio in 10% gasohol fuel is 11.58. Exhaust emis-sion levels for each compound tested for each fuel are still below the standard vehicle exhaust emission thresholds set by Toyota and the environmental agency.]]>
<![CDATA[Implementation of Linear Congruent Methods and Multiplication Random Numbers for Academic Potential Tests ]]>
<![CDATA[Akbar Idaman]]>;
<![CDATA[Roslina]]>;
<![CDATA[Rika Rosnelly]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.160
<![CDATA[APT (Academic Potential Test) is a test that aims to measure a person's ability in the academic field in general. In the implementation of the APT exam, it is carried out in the admission of new students and its application online, using a website-based application, each prospective new student will be given a login account to take the APT exam simultaneously and at a predetermined time. While the process can be accessed anywhere with an internet network. The implementation of the APT exam does not always run smoothly or well, in fact almost every time the APT exam is carried out there are problems, problems that arise because the questions given do not have differences in workmanship which causes the APT exam results to be impure and accurate. To overcome the problems that continue to occur in the implementation of the APT exam, an algorithm or method is needed that can randomize the questions in the APT exam. In this study, the Linear Congruent (LCM) and Multiplicative Random Number Generator (Multiplicative RNG) methods are random methods that are applied to randomize the APT exam questions so that the APT exam question packages can have different question positions and between question packages and the results of the application of this method will be compared to measures how complex the randomization is for each method. By using the LCM model the level of complexity of the questions increases to 100% while by using the MRNG method the level of complexity of the questions increases to 50%.]]>
<![CDATA[River Flood Early Warning System Based on Internet of Things in Binjai City ]]>
<![CDATA[Muhammad Rusdi]]>;
<![CDATA[Meidi Wani Lestari]]>;
<![CDATA[Yuvina]]>;
<![CDATA[Fitria Nova Hulu]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.161
<![CDATA[Flood is an event of inundation of land, which is usually dry, by water originating from water sources around the land. Binjai City is an area prone to flash floods. This is because in Binjai City there are 5 (five) upstream rivers namely the Bingei river, Mencirim river, Bangkatan river, Diski river and Rambai river. A flood early warning system is a series of systems that function to notify an impending flood disaster. With the existence of a flood early warning system, it can provide information to the community and can reduce victims or losses due to the community's unpreparedness in dealing with flood disasters. This study aims to create a prototype of a river flood early warning system based on the internet of things (IoT). The method used is to design and create a flood early warning system prototype, then perform system testing. The system is designed using the Arduino Mega2560 microcontroller as the system control center, the HC-SR04 ultrasonic sensors and the ESP32-Cam camera module as system input, as well as buzzer, LCD and website as system output. The transmission medium used is wireless via a 4G WiFi Modem connected to the internet. System prototype testing will be carried out in the Bangkatan river area in Binjai City. From the results of the discussion, it was found that the river flood warning system using the HC-SR04 ultrasonic sensor and the ESP32-Cam camera module based on the Internet of Things was successfully designed and implemented in prototype form and worked well. Ultrasonic sensors work well in measuring river water level with an average error percentage of 3.642%. The ESP32-Cam camera module works well in capturing images of river water conditions up to a distance of 200 cm. (9 pt).]]>
<![CDATA[Indentification of Beef in Beef and Chicken Experiments using Conducting Polymer Sensor Series and Kohonen Algorithm Method ]]>
<![CDATA[Benrad Edwin Simanjuntak]]>;
<![CDATA[Marhaposan Situmorang]]>;
<![CDATA[Syahrul Humaidi]]>;
<![CDATA[Marzuki Sinambela]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.162
<![CDATA[Chicken, and beef each have a distinctive aroma. Identification of Chicken and beef based on the aroma of the meat using an electronic nose. This electronic nose uses a series of sensors consisting of 6 (six) pieces and uses a Conducting Polymer. This polymer has a high resistance so it is widely used as an insulator. However, this resistance has a certain limit where the polymer surface will turn into carbon and conduct electric current if exposed to excessive electric charge. This research was conducted by taking samples of chicken and beef as test samples where these meats were placed in a closed container at room temperature. Data is taken alternately every day to find out the odor of each meat where on the first day data is taken from the odor of chicken, and on the second day data is taken from the odor of beef. This condition is done to ensure the freshness of each meat. This study uses a Neural Network (NN) as pattern recognition and ATMega16 microcontroller as data acquisition. Neural Network is trained using Kohonen. The sensor used is a Conducting Polymer sensor because of the nature of the Conducting Polymer where the output is a voltage generated due to changes in the polymer resistance resistance. A two-layer neural network consisting of six input nodes and three output neurons is trained using the Kohonen algorithm with the training process completed in 31 iterations. The test was carried out 30 times for each exposure to steam from the odor of chicken and beef which was carried out alternately. The percentage of success of the system is 100%.]]>
<![CDATA[Analysis and Computer Simulation of Biopore Tubes Made of Concrete Foam Reinforced by Durian Skin Fiber ]]>
<![CDATA[Bustami Syam]]>;
<![CDATA[Maraghi Muttaqin]]>;
<![CDATA[Fakhrur Rozy]]>;
<![CDATA[Malvin Setiawan]]>;
<![CDATA[M. Fauzi]]>;
<![CDATA[Fadly Ahmad Kurniawan]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.163
<![CDATA[This research was conducted to utilize durian skin waste into useful materials by maximizing its utilization to solve environmental problems. The idea is to process the fibers so that they can be used as composite reinforcement material. Here, the durian fibers are used as fillers for foam concrete. The so-called concrete foam composite is designed and manufactured to produce tubes utilized for biopore systems. Biopore tube materials were tested and the tubes are also subjected to field tests to check their response subjected to static loading. A series of computer simulations are conducted. Results are compared with other biopore tubes (PVC and concrete). The simulation results show that the concentration of stresses is obviously seen around the hole located in the middle and upper section of the tubes. However, at those critical points in the tubes, the stresses are of smaller than that of the strength of the tubes. We conclude that biopore tubes with 16 holes in total provided on the tube wall are still feasible to be produced.]]>
<![CDATA[Rainfall Mapping in Medan Selayang Sub-District using Geographic Information System ]]>
<![CDATA[Dina Tri Septiningtiyas]]>;
<![CDATA[Rifka Ananda]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.164
<![CDATA[Indonesia is a tropical country which has two seasons, namely the rainy season and the dry season. Rainfall that occurs will vary in each area depending on the altitude of the area, climate, season, and other factors. Medan Selayang Subdistrict is the Subdistrict with the closest distance to the rain station. Where the closer the location of the study area to the rain station, the more accurate the rainfall data obtained will be. One way to make it easier to record and process data is to create a rainfall map by utilizing spatial analysis through a Geographic Information System (GIS). The data in this study are rainfall data and geographic coordinate data obtained from the Meteorology, Climatology and Geophysics Agency in the Medan City area. After data collection, data processing was carried out using the QGIS 3.10 application. with the Inverse Distance Weighted (IDW) interpolation method. From the results of processing rainfall maps in the Medan Selayang sub-district using Inverse Distance Weighted (IDW) interpolation, the rainfall values (rainfall) ranged from 3029.74 mm/year – 3164.20 mm/year.]]>
<![CDATA[A Design and Build a Marketing System UMKM Sumatera Utara With the OOAD Method Approach ]]>
<![CDATA[Rina Anugrahwaty]]>;
<![CDATA[Ajulio Padly Sembiring]]>;
<![CDATA[Sharfina Faza]]>;
<![CDATA[Wiwin Sry Adinda Banjarnahor]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 4 (2023): IJRVOCAS - Special Issues - International Conference on Science, Technology and ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v2i4.170
<![CDATA[Based on the results of the analysis and design that has been carried out regarding the study of electronic-based North Sumatra KUMKM community development analysis (E-Community KUMKM North Sumatra), a conclusion can be drawn as follows, namely the results of the design using the Object Oriented Analysis Design (OOAD) method, all interfaces are designed very interactive so as to facilitate implementation in the system. Using UML as a visualization medium for system design can make the designed model closer to reality. So as to facilitate the development of the system and its application. Based on the results of the analysis using the Performance, information, economic, control, efficiency, service (PIECES) method, the limitations in marketing the results of North Sumatra KUMKM can be solved using information technology, namely the web-based KUMKM E-Community system.]]>
