bluuebunny/crossref_metadata_2025_split huggingface dataset:
Online Learning Model in The Pandemic Time COVID 19 at SMK Negeri 1 Saptosari Yogyakarta
Authors: Sofyan H , Isnantyo F D , Fu’adi  , Pratama A 
Published: December 2020

Abstract
This research is a qualitative descriptive study, the purpose of this research is to: (1) Find out what online learning models are used by SMKN 1 Saptosari teachers during the Covid 19 pandemic; (2) Describe the technical steps for developing an online learning model for subjects at SMKN 1 Saptosari; (3) obstacles experienced by teachers in implementing online learning; (4) Efforts to overcome obstacles. This research was conducted at SMK N 1 Saptosari with research subjects Teachers of productive subjects who represent the existing expertise competencies at SMK N 1 Saptosari as many as 40 people, data collection was carried out by observation techniques in schools when the teacher was doing online learning, interviews with teachers productive, and instruments in the form of a questionnaire used to reveal data on online learning models, the obstacles faced and efforts to overcome them. The results showed: (1) The online learning model used by SMKN 1 Saptosari teachers during the Cocid 19 pandemic used the following platforms: google classroom, google meet, Zoom, WA group, youtube channel, and Microsoft 365; (2) The technical steps for developing an online learning model for subjects at SMKN 1 Saptosari include: (a) Initial analysis to identify the online learning model and platform used; (b) Determination of material; (c) Implementation of lecture, discussion, and mentoring methods in preparing material, structuring the material so that it is easily accessible to students, real-time interaction, role playing; (d) Preparation of RPP; (3) Obstacles faced: (a) Teachers do not master the internet well, (b) Internet quota is limited, (c) The signal is not supportive, (d) Not all students have laboratory devices, (e) Students and their parents are lacking understand the procedures for learning through online well; (4) Efforts are made: (a) Organizing online learning workshops for teachers, (b) Creating class group WA, (c) Simplifying the material so that it is easily accessible and understood by students, (c) Providing internet quota assistance for students, (d) Conduct home visits for students who encounter problems, (e) Provide a grace period in collecting assignments.
Designing Shell Eco Marathon Car Bodies with Solid Work
Authors: Gunadi  , Fergianto F 
Published: December 2020

Abstract
The Shell Eco Marathon is a world-class car competition for students. Through this competition, students compete to create innovation and creativity in the development of vehicle technology. The final result of this competition is the birth of vehicles that are economical, environmentally friendly, including a lightweight and aerodynamic body. This study aims to produce an urban concept car body design for racing purposes, with several provisions that comply with the Shell Eco Marathon competition regulations, have a low drag coefficient and turbulence value. This research includes research and development (R&D), using the ADDIE development model (Analysis, Design, Development, Implementation, and Evaluation). The test object is the 3D urban concept body shape design. The development of the urban concept body design uses the Solid work 2018 software with a flow simulation feature to analyze 3D urban concept body shape designs. The results of this research and development are (1) the design of the car body shape has met the competition regulations, (2) the drag coefficient value can be achieved at 0.1965, and (3) the value of turbulence intensity can be achieved at 0.133%. The results showed that the development of the urban concept body shape design was as planned.
Multi-Channel Method of Non-isolated DC Voltmeter for EFI Instrument Measure
Authors: Adiyasa I W , Solikin M , Khalid H , Umar A , Riyan I N 
Published: December 2020

Abstract
The use of instruments for vehicle repair is very important to use. However, the instrument is very expensive and many features are not used. So that in this study designed a simple measuring instrument that is able to measure the size of the sensor. The tool uses a 32bit based microcontroller integrated with bluetooth. There are 4 voltage gauge channels. The reading data is communicated to the graphic user interface (GUI) on the laptop device. The measuring instrument can record the measured sensor on a vehicle for 1 minute for analysis.
Bilinear Interpolation Method on 8x8 Pixel Thermal Camera for Temperature Instrument of Combustion Engine
Authors: Adiyasa I W , Prasetyono A P , Yudianto A , Begawan P P W , Sultantyo D 
Published: December 2020

Abstract
Measuring the temperature of the combustion engine is very much needed. Both from the use of tuning, research, and learning. The problem with the syringe when measuring the temperature of the combustion engine is that the measuring device must be attached to the combustion engine body and there is a time delay for measuring the temperature. In this paper the focus is on the interpolation method for an 8x8 pixel thermal camera. The image data will be created in a graphical user interface (GUI) so that the image looks very clear. Images that have a resolution of 16x16 and 32x32 resolutions. The Sehigga object on the thermal camera reading looks clearer and more detailed. In the GUI, it allows data to use both ordinary images and videos. There are 3 sample images that have been interpolated. The results of the research on paper show the conditions of the interpolated results from images 8x8 to 16x16 and 32x32. The time it takes to display the image is 0.5 seconds.
The Effect of Change in Injection Timing on Fuel Consumption of Garuda UNY Urban-19 Car Engine
Authors: Sutiman  , Adiyasa I W , Prapsita F A , Yudistira H 
Published: December 2020

Abstract
This study aims to optimize fuel consumption in the Garuda UNY Urban Gasoline-19 vehicle by changing the injection time mapping. Injection Timing Mapping using Programmable ECU software MegaSquirt III and Tuner Studio 3. Based on standard ECU data, Mapping Timing Injection Case 1 (IT-C1) and Timing Injection Case 2 (IT-C2) were generated. Performance tests are carried out using static tests in the laboratory and dynamic tests in the field. The application of IT-C2 resulted in the best reduction in fuel consumption, namely 12% in the static test and 11.08% in the dynamic test. The delay in initiation of injection results in less responsive acceleration.
Cloud Computing Technology: the choice to Enhance the Learning Environment for Automotive Vocational Teacher Education Students as Autonomous Learners
Authors: Yudantoko A 
Published: December 2020

Abstract
Automotive vocational teacher education is an education that has a purpose to prepare their students to be a teacher or an instructor in automotive vocational education. Therefore, they need to become autonomous learners to stay updated related to the development of automotive technology whenever they need it. This is very indispensable to set the learning environment to support their study activities to become autonomous learning. This study aims to determine the way the learning environment could be built to support their independent learning activities based on the students’ perspectives. This study is descriptive research that contains quantitative and qualitative data. The data was collected from final-year Automotive Engineering Education department students at Yogyakarta State University by giving an open questionnaire. The results of the study are (1) 40.54% of respondents choose the development of cloud computing technology, 13.51% and 35.14% of respondents choose the development of physical things and non-physical things respectively as the way to build a supportive learning environment, then the rest 10.81% of respondents said that the existed learning environment has already been good, (2) online collaboration learning, online connection with industrial practitioners, blended learning, online resource center, and online educational media are the examples at most of several ways and competencies that are needed to build a supportive learning environment from the development of cloud computing technology, (3) practical lesson infrastructure and teacher’s administration for teaching are needed from the development of physical things, (4) comfortable, pleasant, relax, and not serious situation, discipline, friendly lecturers, and an atmosphere as if being a vocational teacher are needed to be built so as to have supportive learning environment.
Design of Optimal Charging System on Lead-Acid Calcium Battery for UNY 2020 Electric Car
Authors: Siswanto I , Arifin F , Prabowo H , Asnawi R , Tafakur  , Syafiq A , Kurniawan S 
Published: December 2020

Abstract
The battery is a very important component as a source of energy to drive an electric car. The capacity of using the battery adjusts to the load supplied. The use of batteries in addition to supplying loads is a storage of electrical energy. Methods of storing electrical energy in batteries can use a generator or power supply. This paper discusses the optimal charging system design for lead-acid-calcium batteries in the UNY 2020 electric car. The proposed charging system uses constant current (CC) and constant voltage (CV) based on the 3-stage charging process used. In the design, the characteristic curve of voltage, current, state of charge (SoC) is obtained. The design simulation results show the battery performance during the charge and discharger cycle process for 75 times with the bulk stage, absorption stage, and float stage.
Vocational Teachers Readiness in Face of the Industrial Revolution 4.0: Vocational Teachers Perceptions in Yogyakarta-Indonesia
Authors: Gunadi  , Sofyan H , Nurtanto Muhammad , Arifin Z , Sudira Putu 
Published: December 2020

Abstract
Vocational learning requires new reconstruction in accordance with the demands of globalization. As a result, vocational teachers must carry out new concepts in their learning. This study aims to obtain facts from the learning readiness of vocational teachers in the field of automotive engineering expertise in facing industry 4.0 challenges. This study uses a survey method approach. Data generated from the teacher perception instrument in Yogyakarta -Indonesia with a Likert scale. A total of 71 vocational teachers were involved in the study. The results showed that digital transformation, design principles, learning innovations and vocational teacher skills development have a readiness range between 75.00% -79.8% which is in a good category and needs to increase perceptions widely and deeply. An important finding from the facts of this research is that learning is emphasized on the role of digitalization and technology that is relevant to industry, business, and the world of work (IDUKA).
Impact Loading Performance Investigation of An Open-face Motorcycle Helmet with Hole in Inner Liner
Authors: Yudianto A , Prasetyono A P , Adiyasa I W , Purnomo K B , Fauzi N A 
Published: December 2020

Abstract
Modification of a motorcycle helmet has been performed by inserting an electronic device in the helmet’s inner liner. Therefore, a hole requires to be made to place the device. This study aims to analyze the impact loading performance of a motorcycle helmet due to an impact from the top, rear, and side. The investigation of stress distribution and acceleration experienced by the helmet is analyzed by utilizing finite element method simulation. The results indicate that the hole position is not in the impact area. The outer shell experiences higher stress than the inner liner in all testing conditions. The rear impact causes the highest value of the outer shell stress, where for the inner liner, the side impact contributes to the maximum value of the stress. Headform linear acceleration reaches the peak than is higher than the basic requirements of the helmet testing standard.
The Influence of Spot Weld on The Stiffness of a Car Body T-Joint
Authors: Yudianto A , Ghaffari S , Huet P , Adiyasa I W , Rohman J N 
Published: December 2020

Abstract
The stiffness of the car body becomes important due to the fact that it must keep the passenger’s compartment undeformed even during severe operating conditions. Car body T-joint is one of the main parts of car’s body to properly support its function. Three different cases were applied to evaluate the influence of difference spot weld configuration to bending and torsional stiffness of car body T-joint. The stresses and the displacements were also deeply investigated. The maximum stress in longitudinal direction and due to moment reaches its peak on 55x15 spot weld configuration. The displacement increases as the spot weld distance widen. Both bending and torsional stiffness decrease as the spot weld distance becomes larger.
Developing an interactive learning multimedia basic competence for using facial care tools with technology in students of vocational education
Authors: Zulfiani Putri Chairina , Sugiyono Sugiyono 
Published: December 2020

Abstract
This study aims to: (1) develop interactive multimedia on the basic competence of using facial care tools with technology of the students of SMK Negeri 3 Purworejo; (2) reveal the feasibility of the developed interactive multimedia; (3) reveal the effectiveness of the use of the developed interactive multimedia. This research is research and development applying the ADDIE development model. The subjects are 28 grade 11 students of Beauty of SMK Negeri 3 Purworejo. The data collection is done through interviews, observation, and using a questionnaire and test. The data collection instruments include interview guide, observation guide, product feasibility questionnaire by material experts, product feasibility questionnaire by media experts, product response questionnaire. The data analysis is qualitative, quantitative, descriptive. The results of this research are as follows. (1) The developed interactive multimedia was adapted to the ADDIE development model. (2) The developed interactive learning multimedia is very feasible according to material experts with average score 63 the feasibility percentage of 92.64%, very feasible according to media experts with average score 68,5 the feasibility percentage of 90,13%, and student assessment response to learning multimedia with average score 87,27 the feasibility percentage of 91% that is very feasible to use. (3) The developed interactive multimedia is effective, as shown by the increase in learning achievement as indicated by the different average scores of the pre-test and post-test. The average pretest score is 56.31 and that of the post-test is 89.05. Based on this score an N-gain of 0.75 is included in the” high” category.
Development of learning instruments based on the strengthening of vocational life skills
Authors: Suprihatin Sri Emy Yuli , Zuhnikhayati Enny , Sabatari Widyabakti , Sabatari Widyabakti 
Published: December 2020

Abstract
This study aims to (1) develop a garment production textbook that is suitable according to the IQF based on vocational life skills, and (2) produce a textbook for the Garment Production course that meets the feasibility criteria in the content, presentation, language, and graphics elements and is ready to attain ISBN. This study is a research and development referring to the 4-D (four-D) model, namely the stages of defining, designing, developing, and distributing (disseminating). Observations and an in-depth study were conducted to obtain data on the needs for a Garment Production course textbook, while questionnaires were used to determine the appropriateness of material content, presentation, language, graphics, and student responses. The data analysis technique used wasthe descriptive analysis in percentages. The findings of thestudy includea textbookon Garment Production for the Garmen Production course consisting of two chapters and 12 learning activities developed through a four-D model (4-D) procedure.The content of the material, the presentation, language, and graphics of the textbook are found to be very feasible by three experts in their respective field. Therefore, the textbook on Garment Production that has been successfully developed is very feasible to use in learning the Garment Production course according to Level 6 of the IQF and the National Competency Standards in the Garment field as it applies vocational life skills.
Fuel filter condition monitoring (ffcm) devices innovation on truck diesel engine to prevent filter blocking due to use of bio diesel: b10-b20-b30
Authors: Pranoto Hadi , Wahab Abdi , Arifin Zainal , Siswanto I 
Published: December 2020

Abstract
Currently, diesel fuel uses with a mixture of plant oil, or animal oil are increasingly stifling. To increase awareness of the dangers of global warming, the government strongly supports the presence of biodiesel. Biodiesel in Indonesia, such as B10, B20, or even B30, has been sold in the market. However, it turns out that the use of this mixture of fuels can cause fuel filters to be clogged faster than pure petroleum fuels. Some users are forced to replace the fuel filter faster than before. This can also cause unexpected blockages from diesel users, so we need a measuring device that can measure the level of the block from a fuel filter. The method in this research is to make a filter connecting bracket from aluminium then attach a pressure sensor to the fuel flow in and out, which is connected to the raspberry-based python programming communication system to be able to display the actual pressure data in each fuel flow leading to the fuel filter, after that the results of the innovation were tested directly on the diesel engine which was applied to the truck. The result of the design strength simulation can withstand a load of 15N with von mises stress on the bolt hole of 4.5 N / mm2 or 4.5 MPa the yield strength material applied to the bracket aluminium Alloy 6061 of 55 N / mm2 or 55 MPa, develop the system base on raspberry pi using a python program that will be read by the monitor board and will produce a percentage of a filter block right level of accuracy in reading the program that is with the error of 1,2%, after the tool is fabricated, it is tested directly on the truck diesel engine, namely on a new filter or 0 hours using biodiesel fuel B0, the result is a block filter percentage of 40%, biodiesel B20 has a block filter percentage of 41% and using biodiesel fuel B30 gets the filter block yield by 42%.
Model Experimental of Photovoltaic-Electrolyzer Fuel Cells as a Small-Scale Power
Authors: Herlambang Y D , Kurnianingsih  , Roihatin Anis , Arifin Fatahul 
Published: December 2020

Abstract
The purpose of this study is three to study the flow rates of H2 and O2 oxidants based on KOH concentrations at certain voltages, find the value of the best photovoltaic power at a particular test time, and find the value of fuel cells and improve the best photovoltaic-electrolyzer-fuel cell system based on calculations and the best time. The research method begins with studying the components of the PV electrolyzer and fuel cell, continuing experimental testing, and analyzing the research results. The results were obtained from the results obtained at 14.00 WIB. In electrolyzer testing, testing variations of 1 M, 2 M and 3 M molarity. The test results obtained the highest H2 and O2 gas flow rates at concentrations of 3 M, and the best efficiency at 1 M. From these data used for testing photovoltaic-electrolyzer systems -Fuel cell at 14.00 WIB with a concentration of 3 Molar, obtained the highest efficiency value of 1,847% with a power output of 2,184 Watt.
Model predictive control approach for the system of multi input single output
Authors: Khairudin M. , Herlambang SP , Siswanto I , Tirantini D , Syarif Junaidi 
Published: December 2020

Abstract
This study aims to determine the control optimization system with Model Predictive Control (MPC) for the plant of Multi Input Single Output (MISO). The MPC optimal control system designed for the closed-loop Mismatch method, and the effect of changes in the Kalman amplifier state estimator. The study conducted with simulation work using Simulink in MATLAB. The results of these experiments show that the output by changing the Kalman amplifier produces a more structured graph compared to MPC Controller.
Short carbon fibre effect on compressive strength of lava stone composite
Authors: Aminnudin  , Suryanto Heru , Pradana Yanuar Rohmat Aji 
Published: December 2020

Abstract
Lava stone can be found around volcanoes and it has been widely used in human civilization. Composite which is an alloy of two or more materials who’s each material still can be identified clearly. Composites with lava stone and matrix epoxy resin will have the properties of a combination of these materials. The mechanical properties of these composites can be improved by adding other materials which have a higher mechanical strength. In this study, carbon fibre was used as an additional reinforcing material. The lava stone powder used is the powder from sawing lava stone process. The lava stone powder was pulverized by a ball mill process for 4.5 hours. The matrix used was epoxy resin with a ratio of 2: 1 resin and hardener. The carbon fibre used is a short fibre with a length of 6 mm. The compressive test results on the lava stone-short carbon fibre composite showed the highest compressive strength was found in the composite with the addition of 1% carbon fibre (84.42 MPa) and epoxy 30%.
Transportation Demand Forecasting System using System Dynamics
Authors: Aurachman Rio 
Published: December 2020

Abstract
The transportation system has a certain capacity. The needs of the transportation system need to be predicted. The predictions made are the basis for providers to prepare existing transportation facilities. Through this paper, we propose a system to predict the capacity requirements of the transportation system using a dynamic systems approach. We use the Stella application as a dynamic system modeling tool. It was found that using the dynamic systems approach, the relationship between variables that form complexity can be modelled.
The choice of the method for calculating heat supply from solar radiation to determine the load on the climate system of the cabin of a mobile machine
Authors: Maslensky V V , Bulygin Yu I , Temirkanov A R , Shchekina E V 
Published: December 2020

Abstract
The aim of the study is to analyze and select a rational method for calculating heat suply from solar radiation for the correct determination of the thermal load on the climate system of the cabin of a mobile machine. The correct calculation of this component of the heat balance allows to correctly determine the power of the climate system of the cabin, which ensures optimal working conditions at the workplace of operators of mobile machines. To achieve the goal, the most common methods for calculating solar radiation were described and analyzed in detail, and the most accurate ones were recommended. The more laborious Bogoslovsky method (taking into account the time of the day) can be recommended for automated calculations in Excel, and the Hamburg method (taking into account the horizon sides) – for comparative evaluative engineering calculations. When carrying out “in-depth” model calculations and accounting for solar radiation, the ASHRAE method is explicitly suitable, which has two important advantages: it takes into account the solar factor in relation to a specific type of glazing and is adapted for automated calculations in ANSYS FLUENT.