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This study aims to analyze the maintenance strategy of railway lines in West Sumatra using the Life Cycle Cost (LCC) approach to determine the most economically efficient and sustainable maintenance option. The main issues raised are the high cost of reactive maintenance and the risk of operational disruption due to track damage. The research method involved collecting construction, operational, and maintenance cost data from railway operators, as well as LCC-based scenario simulations to compare preventive and reactive maintenance strategies. The results of the analysis show that the preventive maintenance strategy results in lower total life cycle costs, compared to the reactive strategy. In addition, the preventive strategy also supports operational sustainability by minimizing the risk of service disruption and improving user safety. SWOT analysis shows that LCC implementation has great potential to improve budget efficiency and support local economic growth, although challenges such as data limitations and natural disaster risks need to be mitigated. This research concludes that an LCC-based approach can be the basis for designing more effective, efficient and sustainable railway maintenance policies. Recommendations include prioritizing preventive maintenance, using monitoring technology, and strengthening supporting policies.

This study aims to identify the problems faced by students in implementing learning. This study used a quantitative approach with a survey method, involving 30 students from two high schools in Yogyakarta. Data were collected through questionnaires about students' learning difficulties, interests, and needs for learning media. The results showed that 96% of the students considered chemistry as a difficult subject to understand because of the abstract nature of the material. As many as 64% of the students felt bored due to the uninteresting presentation of the material, while 72% of the students indicated the need for varied learning methods and interactive learning media to facilitate understanding. The results of the study showed that an innovation was needed to support chemistry learning activities to make learning more active and enjoyable so that it does not lead to student boredom. The developed virtual laboratory media provides flexible, safe and economical simulation of chemical experiments. This application is designed to be accessible without an internet connection using an Android device, allowing students to learn anytime and anywhere. The use of this virtual lab is expected to increase students' motivation, understanding of concepts, and learning experience.

With the advancement of technology and computing capabilities of computers, various applications and algorithms that were previously not applicable to portable devices such as laptops and smartphones can now be applied. Artificial intelligence (AI) is one of the increasingly popular techniques that are now a part of everyday life. AI is an umbrella term that refers to the simulation of human intelligence by machines that use big data to perform various tasks. AI has benefited many aspects of human life, including education. However, AI also has significant negative effects. This study aims to study the influence of artificial intelligence on students' critical thinking skills. This study uses qualitative research and literature analysis. However, the study also identified several negative impacts, including reliance on technology, unassured information quality, social isolation, and ethical and privacy concerns. Therefore, a balanced and strategic approach is needed in integrating AI in education to ensure that its benefits can be maximized, while its negative impact is minimized.

Induction motors are components that convert electrical energy into mechanical energy and are very much in demand among industries, with low prices, sturdy construction and easy maintenance making these induction motors used for heavy industrial applications. However, the 3-phase induction motor at this time chooses a low torque and speed so that it affects the efficiency of the induction motor performance, which will decrease.  This study examines the effect of unsymmetrical 2-layer 6-phase induction motor design on the torque and speed of 3-phase induction motors using the finite element method. This research was conducted using Ansys software, which aims to see the magnetic flux density and the effect of 6-phase induction motor design on the torque and speed of a 3-phase induction motor using the finite element method. The induction motor that is the reference for this research has specifications of a 3-phase induction motor: 0.75 KW, 1 HP, 220/380 V, 3.5/2 A, 50 Hz, 1390 rpm. From the results of this study, the simulation results of the shape of the flux density ... which is designed with the parameters of a 3-phase induction motor with an unsymmetrical 6-phase 2-layer induction motor coil design.

 Central Java was recorded as the area with the highest fire rate in the period from January 1 to July 24 2023, with 637 cases recorded. In 2018, a fire hit Agustinus Junior High School, at Semarang City. The aim of the research is to determine the effect of implementing a fire disaster preparedness simulation in increasing the knowledge and attitudes of Agustinus Middle School residents regarding fire disasters. The research design used was a quasi experiment with a quantitative approach. This research used a one group pretest-posttest design. In this research design, the entire population is used as research respondents. The pretest was given before the fire disaster simulation activity began and the posttest was given after all respondents carried out the fire disaster simulation activity. The research instrument used a questionnaire sheet. Data were analyzed with wilcoxon test. The results of the research show that there is an effect of implementing a fire disaster preparedness simulation on the knowledge and attitudes of Agustinius Junior High School residents with a wilcoxon p value of 0.000 and there is an increase in the knowledge of the school community by 24.3% and the attitude of the school community by 34% compared to before the simulation. This research suggests that schools should hold regular disaster preparedness simulations at least once a year and collaborate with related professional institutions to increase the capability and effectiveness of school emergency response teams in handling emergency situations.

The Sutami Hydroelectric Power Plant managed by PLN Nusantara Power UP Brantas is one of the power plants that relies on air resources to generate electricity. However, the optimization of electricity production can still be improved by considering the availability of primary energy and the interests of related stakeholders. This study aims to create a simulation of operating patterns to optimize the daily electricity production of the Sutami Hydroelectric Power Plant using the MS Excel Solver program. The total electrical energy in March based on the results of the simulation calculation was 56,537,445.55 MWh, 3.09% greater than the actual data of 54,792,800 MWh. The results of the simulation calculation of electricity production in June 2024 were 27,564,315.75 MWh, 3.82% greater than the actual data of 26,511,800 MWh. In FDC 2014-2023, the average mainstay discharge is 32 m3/s available throughout the year to be utilized by water turbines to produce a minimum power of 20 MW. Meanwhile, from the estimated historical data obtained by FDC 2024-2033 with an average mainstay discharge of 40.68 m3/s to produce a minimum power of 30 MW.

This research aims to design and simulate a DC motor speed control system using integral state feedback (KISF) control. This control is designed to maintain DC motor speed stability with high accuracy despite disturbances or load changes. The research stages include mathematical modeling of the DC motor, PID control design, integral state feedback control design, simulation implementation and simulation results analysis. The show that althought integral state feedback control has a rise time 273.501 ms, slightly slower than PID 197.604 ms, integral state feedback compensates with higher slew rate of change 6.540 V/ms compared to PID 4.344 V/ms. Integral state feedback offers greater flexibility through pole placement values with Ackerman’s formula J3 = [-12 -100 -600], indicating that this system has good capability in responding to input changes, thus maintaining motor speed stably and efficiently. This indicates that integral state feedback control is superior in system adaptation and handling complex dynamics.

Digital Business students at Universitas Pendidikan Indonesia Tasikmalaya Campus recognize the importance of Quality Assurance (QA), but many do not fully grasp the concept. This study aims to describe and evaluate students’ understanding of QA, with the goal of bridging the gap between awareness and application in the field of Digital Business. The research method used is descriptive quantitative, employing a Probability Sampling technique with a Proportionate Stratified Random Sampling approach. Results indicate that students generally have a good understanding of QA, especially in grasping basic concepts and the significance of QA for product quality. However, some dimensions of QA remain less understood, particularly regarding practical application in the industry. The depth of understanding varies; most students have a sufficient basic grasp, but only a few can relate QA concepts to real-world case studies. Based on these findings, the Digital Business Study Program is advised to integrate practical elements into the QA curriculum, such as QA simulations, industry case studies, and collaborative projects with companies. This is expected to enhance students’ understanding and bridge the gap between QA theory and practice. Future research could test the effectiveness of various QA teaching approaches and compare understanding across different study programs.   duk

The aim of this community service is to empower small shop owners in Jayamukti Village by providing training on financial management and digital marketing. This training is expected to enhance the shop owners’ skills in efficient financial management and their ability to utilize digital technology for marketing their products. The training was conducted with a practical approach, involving the delivery of material, case studies, and hands-on simulations. The results of this community service show an improvement in participants’ understanding of managing shop finances and utilizing digital platforms for promotion, which is expected to increase the revenue and sustainability of small shops in the village

This study examines the effectiveness of the Recitation and Simulation methods in improving students' learning outcomes in Islamic Education (PAI) at SD Negeri 050578 Kwala Begumit. The research was motivated by the observed low achievement of students, where many did not meet the Minimum Completion Criteria (KKM). A classroom action research (CAR) design was employed, consisting of two cycles, each involving planning, action, observation, and reflection. The findings indicated a significant improvement in cognitive abilities: the average score increased from 43.41% in the pre-cycle to 56.72% in Cycle I, and further to 95.23% in Cycle II. These results demonstrate that the combination of Recitation and Simulation methods effectively enhances students' understanding and engagement, ultimately leading to improved academic performance in PAI.    

This community service activity aims to increase the understanding and ability of business groups in Kassi Village, Rumbia District, Jeneponto Regency in making effective business projections. This program is expected to provide strategic provision for business actors in managing finances, planning business development, and facing market challenges. The technique of implementing this activity includes three stages starting from the preparation stage, the implementation stage and the activity evaluation stage. The results of the training showed that traditional business owners have difficulty in applying business forecasting techniques to their businesses because sales records are sometimes incomplete or non-existent. After conducting the simulation, participants were able to understand the basis of sales forecasting for future sales forecasts. In addition, business owners can know their business forecast with certainty. Knowledge of business forecasting is expected to improve business performance and competitiveness. The limitation of this training is that the implementation method does not use instructional techniques so that knowledge about business forecasting can be implemented in business activities.

When making investment decisions, it is crucial for investors to consider various risks that may arise, both in the short and long term. One method to measure risk is through volatility. Volatility represents a statistical measurement of the degree of price variation over a specific period, expressed as volatility (σ) (Aklimawati & Wahyudi, 2013). This study aims to discuss the pricing of European option contracts using Conditional Monte Carlo simulation and the Black-Scholes method. The data used in this study is secondary data obtained from Yahoo Finance. The data consists of quantitative information, namely the monthly closing prices of Toyota Motor Corporation (TM) stock, spanning 5 years from July 1, 2019, to July 1, 2024, yielding 60 data points. In this research, the pricing of European call option contracts was calculated using Conditional Monte Carlo simulation and the Black-Scholes method. The study concludes that European option contract pricing can be determined using two methods: Conditional Monte Carlo simulation and the Black-Scholes method. Conditional Monte Carlo simulation can be employed to calculate European option prices in a structured manner, utilizing stochastic volatility estimated through the Ordinary Least Squares (OLS) method. The two methods yield differing option prices; Conditional Monte Carlo simulation produces lower option price estimates with relatively lower error values compared to the Black-Scholes method at every strike price. The lower estimates from Conditional Monte Carlo simulation are due to its consideration of stochastic changes in volatility, whereas the Black-Scholes method results in higher prices due to its assumption of constant volatility. The comparison demonstrates that Conditional Monte Carlo simulation provides cheaper price estimates under market conditions with non-constant volatility, despite requiring higher computational time compared to the Black-Scholes method.   ,

Training management is a crucial component in organizing training programs and contributes to creating effective training. This study aims to describe the identification of training needs, training methods, training management strategies, and training success indicators at Sanggar Seni Greget in Semarang. The research method employed is descriptive qualitative research. The research subjects include the founder, the head, the secretary, and staff in the field of dance. The research informants consist of an instructor and two training participants. Data collection techniques include interviews, observations, and documentation. Data validity techniques utilize source triangulation and method triangulation. Data analysis encompasses data collection, data reduction, data presentation, and conclusion drawing. The research findings indicate that the identification of training needs at Sanggar Seni Greget involves organizational analysis, job task analysis, and individual analysis. The training methods used are demonstrations, lectures, and simulations. The training management strategy design includes planning, resource management, organizing, training development, promotion, implementation, and evaluation. The success indicators of the training are measured through goal achievement, skill and knowledge enhancement, behavioral changes, participant satisfaction, and productivity.

In this study, the implementation and simulation of a servo SG90 drive system based on Arduino Uno with dynamic angle control were carried out. The SG90 servo motor is widely used in various applications such as robotics and automation due to its ease of control and small size. The objective of this research is to develop a control system capable of adjusting the servo angle dynamically using Arduino Uno. The simulation method involves hardware and software simulations combined with servo control code based on PWM (Pulse Width Modulation) signals. The results show that the system is capable of accurately controlling the servo angle through a potentiometer as a dynamic input, along with simulation visualization in a software environment.

The aim of this research is to evaluate the effectiveness of learning simulations in the Pancasila Education subject in implementing creative learning strategies for grade 2 students at SD Negeri Cangkiran 01. This research was conducted using a qualitative descriptive approach, where data collection was carried out through observation, interviews and documentation. The research subjects were 2nd grade teachers and 28 students. The research results show that educational simulations are effective in increasing students' understanding of Pancasila values. This also helps students create more interactive and interesting learning strategies. Demonstrated by better critical thinking skills, better understanding of concepts, and increased student engagement in learning. Educational games based on Pancasila values, stories and role plays are one of the creative learning strategies used. This research shows that educational simulation can be an effective learning alternative in instilling Pancasila values in grade 2 elementary school students at SD Negeri Cangkiran 01.

Abstract: This study explores the communication patterns used by the Fire and Rescue Department of Bekasi City in disseminating fire disaster mitigation education at SMK Vinama 2 Bekasi. The research investigates how disaster communication is implemented through socialization programs aimed at increasing students’ awareness and preparedness toward fire hazards. Using a qualitative descriptive approach, data were collected through interviews, observation, and documentation with key informants, including officials from the Prevention Division, school representatives, and student participants. The findings reveal that the department adopts a multi-layered communication model integrating one-way, two-way, and multi-way approaches to effectively convey safety messages. The process involves formal coordination, practical demonstrations, and participatory simulations, contributing to improved literacy and proactive attitudes among students. This study highlights the essential role of structured communication patterns in enhancing disaster preparedness and proposes recommendations for strengthening participatory engagement in future educational programs.

Smoke hazards can result in poisoning of harmful gases produced by the welding process. So it is expected that in order to maintain air cleanliness in the welding workshop by installing an exhaust gas channel from welding, the purpose of this research is to analyse the flow of exhaust gas through simulation of fluid flow velocity (welding smoke) in the design of exhaust gas installation in the welding workshop using CFD or Computational Fluid Dynamics method. CFD simulation can predict in detail the movement of wind (moving fluid) in the welding fume exhaust duct. CFD simulation is carried out through three stages, namely pre-processing, solving, and post-processing. This CFD uses the Solidworks (Flow Simulation) application programme. It was found that the installation of a welding fume exhaust duct with an output capacity of 39 m³ per minute showed a significant increase in airflow velocity. The first simulation results at the exhaust fan (welding booth) showed a maximum velocity value of 13.14 m/s and an average velocity of 10.55 m/s, the Reynold's number was 84567.11. In the second simulation, with the axial fan (Fan stationary) at 2600 RPM and pipe diameter 127 mm, better results were obtained, namely minimum velocity of 12.88 m/s, average velocity 13.94 m/s, maximum velocity 14.53 m/s and Reynold's number 111512.74. So the simulation results show an improvement in the performance of the ventilation system, where the airflow velocity is quite good, which ensures the efficiency of the ventilation system.

The impact that can occur when parents do not immediately provide first aid for febrile seizures is that it can increase the risk of damage to the brain, delays in development and the emergence of symptoms of epilepsy.  Parents should know information regarding the treatment that needs to be given to children who experience febrile seizures.  Because if parents have a minimal attitude and do not immediately take their child to a health worker, it will cause the child to experience the effects of febrile seizures, one of which is brain damage and death. The aim of this research is to analyze the influence of simulation methods on knowledge and skills of first aid for seizures in children in Kutakerangan Village, Simpang Kanan District, Aceh Singkil Regency, Aceh Province in 2024. The type of this research is Quasy Experimental Research with a one group pretest-posttest research design which consists of 1 experimental group carried out in Kutakerangan Village. The population in this study were mothers who had babies aged 0-12 months, totaling 33 respondents. The sampling technique used is Total Sampling. As well as bivariate analysis using the Wilcoxon test. In conclusion, the p-value was obtained: 0.00 <0.05, which means there is an influence between knowledge and first aid on seizures and the p-value: 0.003 <0.05 means there is an influence between skills and first aid on seizures in Kutakerangan Village, Simpang Kanan District, Aceh Singkil Regency, Aceh Province in 2024.

Excess sugar consumption, particularly from ultra-processed foods is a significant health issue for the community. This community service program aims to raise awareness about the health risks posed by excessive sugar consumption, with a focus on mothers in Hapakat Kindergarten, Bagendang Hilir Village. Through collaboration with the village Health Post, this activity was carried out with an educational approach in the form of socialization and interactive discussions. The methods used included material presentation, interactive discussion, questions and answers, and simulation of calculating daily sugar intake. The results of this activity showed an increase in participants' understanding of the dangers of excessive sugar consumption and preventive measures that can be applied in everyday life. This program is expected to contribute to government policies regarding preventive health education and regulation of sugar consumption in packaged food and beverage products.

This community service activity was carried out to answer the challenges of modern education, especially in designing assessments that are inclusive and responsive to the diverse learning needs of students. The program involved 25 teachers from five elementary schools in Gunung Anyar Sub-district, Surabaya. The training method includes preparation through a needs survey, exposure to the basic concepts of differentiated assessment, collaborative practice, implementation simulation, and ongoing mentoring. The results of the training showed a significant increase in teacher competence, especially in understanding the concepts of formative, summative, and diagnostic assessments, as well as the ability to design flexible rubrics and assessment formats. As many as 85% of participants understood the objectives of the activity well, 78% felt that they understood the material very well, and 82% felt helped by simulations and hands-on practice. In addition, the training created a culture of productive collaboration between teachers, which was felt by 88% of participants. However, there are challenges in the form of the need for more time for technical deepening of rubric development and implementation assistance in the classroom. Collaborative practice-based training proved effective in improving teachers' competence in differentiated assessment. For the sustainability of the program, further training, the establishment of teacher learning communities and increased school support are recommended. This program is expected to create a more inclusive, innovative and responsive basic education for students' diversity.