Journal of Engineering and Scientific Research (JESR)
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Comparison of SVM & Naïve Bayes Methods in Sentiment Analysis of Electric Vehicle Subsidy Policy Based on X Data
Full text linkThe policy of subsidizing electric vehicles has become a widely discussed issue on social media platform X. The provision of electric vehicle subsidies by the Indonesian government aims to stimulate higher adoption of electric vehicles, with the overarching goal of mitigating air pollution. However, the presence of electric vehicle subsidies continues to elicit both support and opposition among the public. On social media platform X, there is a wealth of data suitable for text mining, particularly concerning the current hot topic of electric vehicle subsidies. This research aims to compare the performance of Support Vector Machine (SVM) and Naïve Bayes methods in conducting sentiment analysis on discussions related to the electric vehicle subsidy policy on social media platform X. The testing technique involves using 20% of the total dataset, comprising 5553 data points, and employing 10-fold cross-validation. The results from the 20% test data indicate that the Support Vector Machine (SVM) method's confusion matrix performance is superior, with the highest values achieved using the RBF kernel: accuracy 83.02%, precision 84.61%, and recall 83.02%. In the performance evaluation testing with 10-fold cross-validation, the Support Vector Machine (SVM) method outperforms, especially with the RBF kernel, yielding an average accuracy of 82.88% over 10 iterations
Household Food Security: Evaluation of Influential Variables Using Exploratory Factor Analysis
Full text linkUnderstanding the patterns that influence food security is very important. Deconstructing food security assessment into clearly defined variables might enhance its effectiveness. Efforts to improve food security measurements are generally prioritized on the most visible, objectively measurable, and familiar dimensions. In reality, there is sometimes confusion regarding which components of the food security definition a metrics is assessing, leading to the interchangeable use of indicators for distinct food security dimensions. Identifying, studying, and understanding these determining factors is the first step in exploring government policies and strategies to reduce food insecurity in any development. This research aims to analyze and identify those factors that have been identified through literature, their ranking is done by a questionnaire-based survey and an exploratory factor analysis approach. The literature identifies fifteen variables that have an impact on family food security. From these variables, four elements are extracted, which are household debt, distance to market, age of household head, and transportation cost dimensions. The findings of this study can serve as a point of reference for future research aiming to understand the impact of these four characteristics on family food security
Analysis the Effect of Different Surface Preparation Methods on Corrosion Resistance and Adhesion Strength of ASTM A36 Steel Substrate with Surface Tolerant Epoxy Paint as Coating Material
Full text linkIn the industrial world, to extend the service life of materials, protection methods are carried out to slow down the material's corrosion rate. The protection method that is often used is the coating method. The coating method is a protection method by coating the substrate material using a coating material to prevent contact between the substrate material and the environment. In this research, the substrate material used is ASTM A36 steel and the coating material used is Surface Tolerant Epoxy paint. The independent variable used in this study lies in the surface preparation method which consists of: solvent cleaning, hand tool cleaning, power tool cleaning, power tool to bare metal cleaning, and abrasive blast cleaning. Different preparation methods result in different roughness and cleanliness of the surface. This can affect changes in the mechanical properties of the coating material, such as corrosion resistance and adhesion strength. Based on the corrosion resistance test, it is found that the abrasive blast cleaning and power tool to bare metal cleaning methods produce the highest corrosion resistance properties because both have a rating number of 8 in the salt spray test results. Based on the adhesion strength test, it is found that the abrasive blast cleaning method also produces the highest adhesion strength. This conclusion refers to the results of the tape x-cut test where the sample produces a rating number 5A where the sample does not experience peeling after testing. In addition, the abrasive blast cleaning method produced the highest adhesion strength in the pull-off test, which was 7.16 Mpa. Thus, the abrasive blast cleaning method is the most effective surface preparation method for ASTM A36 steel before being coated with the coating material. In addition, it can also be concluded that the higher the surface roughness of the sample, the better the corrosion resistance and adhesion strength
The Evaluation of Low-Cost Apartment Building Lampung University (Rusunawa Building) Using Greenship Rating Tools for Existing Buildings
Full text linkThe assessment of the green building at the Rusunawa Lampung University was conducted using the Greenship Rating Tools for Existing Building Version 1.1. Measurements were carried out to examine the overall sub-criteria of each greenship assessment category. The greenship rating tools for existing buildings version 1.1 are quite complex, as there are 6 (six) feasibility tests and sub-criteria. Based on field measurements and analysis of the green building assessment criteria using the greenship existing building rating tools version 1.1 at the Rusunawa Lampung University, as there used rating score of 17 points. The final result, the Rusunawa Building Lampung University does not have a rating for the Green Building criteria. To achieve a minimum bronze rating, and an assessment of the greenship assessment categories, the parties felt necessary to obtain recommendations for the improvements according to the assessment matrix that can enhance the Green Building rating for Rusunawa Lampung University
The Performance Comparison of Battery Charging Using MPPT and PWM Controllers on Amorphous Solar Panel-Based E-Scooters
Full text linkSolar Panel-Based Electric Scooter (E-Scooter) is an electric vehicle in the form of a scooter that uses solar panels as a source of electrical energy for charging batteries and a BLDC motor as a wheel drive. With the development of the E-Scooter, it is necessary to know how to charge the battery. The purpose of this research is to determine the type of Solar Charge Controller (SCC) that can maximize battery charging on the E-Scooter. The research method is to compare SCC MPPT and SCC PWM. The research was conducted by monitoring the output current and voltage of the solar charger controller generated by the solar panels every 10 minutes. After that the recorded data will be stored in the monitoring device's storage memory for further processing. The results of the data that have been obtained on the e-scooter using the SCC MPPT type are capable of producing a power of 9.05 W with a current value of 0.33 A and a voltage of 27.47 V. Meanwhile, the PWM type SCC is capable of producing 8.22 W of power with a current value of 0.30 A and a voltage of 27.42 V. So that the MPPT type SCC is more economical than PWM for charging when the e-scooter is not moving. For the running conditions of the MPPT type SCC e-scooter is capable of producing 7.36 W of power with a current value of 0.27 A and a voltage of 27.26 V. Meanwhile, the PWM type SCC is capable of producing a current of 6.81 W with a value of 0.25 A and a voltage 27.24 V. So that the MPPT type SCC is more efficient than PWM for charging when the e-scooter is running
UI/UX Gamification Features in Campaign Application Using Design Thinking Method
Full text linkDuring the Covid-19 pandemic that hit all corners of the world, many people had to change their daily lives and one of them was social activities. Campaign is a mobile-based application to carry out social actions and open donations from sponsors where users can take part in campaign actions anywhere and anytime and also make donations without having to spend a penny. The problem experienced by Campaign is that users don't do challenge actions on a regular basis because this action takes several days, so users often lose motivation in the middle of the road and the challenges are not completed. Based on the problems, the gamification feature was designed to motivate users in completing challenges. The design of this gamification feature uses the Design Thinking method which passes through 5 stages, which are Empathize, Define, Ideate, Prototype, Test. The result of this research is a prototype of the gamification feature which is designed with three iterations of changes and testing of the prototype is carried out to get UI/UX design results that are in line with the main goal. The test results on three informants were passed with an average SEQ score of 6.57 from a scale of 1-7. There are several elements, such as the system level and badges, that need to be developed in the design iteration so that the UI design results of the gamification feature are more ready to use
Sustainable Drainage System Analysis In The Institut Teknologi Sumatera (ITERA)
Full text linkThe Institut Teknologi Sumatera is a new university that still requires planning and infrastructure development, one of the development needed is the construction of a drainage system, namely a sustainable drainage system that adheres to the concept of water conservation. The purpose of this research is to analyze topographic conditions, as well as the performance of the existing drainage system in ITERA and to develop recommendations for a sustainable drainage system. In this study, several stages were carried out, first analyzing the topographical conditions in ITERA. The second is to analyze the existing drainage capacity, which is to compare the existing drainage capacity to the runoff that occurs when it rains. The calculation of runoff discharge is obtained from hydrological analysis of rainfall data using the annual maximum partial series method. Third, synthesizing the connectivity between drainage segments to the reservoirs in ITERA.
The results of several analyzes above show that, firstly, the topography in ITERA is relatively flat with the most dominant elevations being 85 - 100 m and 100 - 105 m. Second, the calculation results show that the existing drainage capacity is still able to accommodate the runoff that occurs. So for now it is still safe against inundation and flooding. Third, the results show that there are several existing drainages that have not been connected to other drainage segments and water does not run off to the designated place as a reservoir, namely the reservoir.
 
Lecturer Forecasting and Professor Acceleration using Bussiness Intelligence
No full textUniversities must be allowed to compete and increase public accountability and competitiveness in order to enhance the quality of education. Human resources, such as professors and educational staff, are one of the supporting aspects. Lecturers are one of the most significant markers for gauging the viability and quality of academic programs and postsecondary institutions. Lecturer data evolves according to educational level, functional position and tenure (retirement) which need to be monitored and anticipated as data to help strategic planning for the next few years to improve the quality and accountability of a tertiary institution. Data sources that are validated and linked with legally authorized data sources are required to support business intelligence in the decision-making processes of policymakers and institutional leaders
BLDC Motor Stability Management Using Adaptive PID (MRAC-PID)
Full text linkBLDC motors have become popular in various industries such as automotive, consumer, healthcare, industrial automation, and instrumentation due to their optimal performance. To keep the BLDC motor in optimal condition, a control engineering system is required that serves as a controller. A single Proportional Integral Derivative (PID) control system is only suitable for linear conditions, so it cannot produce satisfactory output when there is a change in set point. To overcome this obstacle, an adaptive PID control system known as MRAC-PID control system is applied, which is able to control the stability of the BLDC motor as desired. Testing of this system is done under 4 different conditions using MATLAB software. After testing, the parameter values for the MRAC control system were obtained, namely ???????? = 0.4; ???????? = 50.75; ???????? = 0.0000867. Based on the test, the MRAC control system produces a system success rate of 81.2% to 98.9%
The Effect of Sodium Hydroxide Concentration on Physical and Mechanical Properties of Magnesium AZ31 Coating for Biodegradable Bone Implant Application
Full text linkAnodizing is a metal coating technique by converting a metal surface to form an oxide layer by electrolysis, one of which is to increase the hardness of a material. This research was carried out to know the effect of variations in electrolyte solution on the hardness of the coating resulting from the anodizing process. The electrolyte used is a solution of NaOH (Sodium Hydroxide) with a concentration of 1 M solution of 68% purity. The specimen used is magnesium AZ31, voltage 10 Volts, soaking time 10 minutes at room temperature. Based on the data analysis results, the magnesium layer's hardness value at 10 minutes at a voltage of 10 volts is 69 HV.In comparison, the coating thickness result at 10 minutes with a constant voltage of 10 volts is 6 ?m. While the concentration of the solution is 0.5 M, the purity is 68%. The specimen used is magnesium AZ31, voltage 10 Volts, soaking time 10 minutes at room temperature. Based on the results of data analysis, the hardness value of the magnesium layer at 10 minutes at a voltage of 10 volts is 67 HV. In comparison, the coating thickness at a time of 10 minutes with a constant voltage of 10 volts is 4 ?m. With variations in stress and time in different concentrations of the solution, there will be differences in the hardness value and thickness value of the AZ31 magnesium coating material