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Flooding is a natural disaster that still frequently occurs in Singkep District, Lingga Regency, Riau Islands Province. This disaster has quite serious impacts on the community, both in the economic, social, and health sectors. Therefore, the problem of flooding should be a serious concern for the local government, particularly in improving the effectiveness of coordination between agencies directly involved in flood mitigation efforts. This study aims to determine the coordination process between the Regional Disaster Management Agency (BPBD) and the Public Works and Spatial Planning Agency (PUTR) of Lingga Regency in flood management, as well as to identify obstacles encountered in its implementation. The research method used is qualitative with a descriptive approach. The researcher uses the coordination theory of Harold Koontz which emphasizes four important elements: work planning, meetings or interactions, communication, and division of tasks. Data were collected through in-depth interviews, field observations, and documentation from both related agencies. The results of the study indicate that inter-agency coordination has not been running synergistically. The work plans of each agency have not been fully integrated, resulting in the implementation of the flood mitigation program running independently based on their respective duties and functions. The Regional Disaster Management Agency (BPBD) places greater emphasis on non-structural mitigation approaches such as education and simulations, while the Public Works and Housing Agency (PUTR) focuses on technical aspects such as flood control infrastructure development. Inter-agency meetings remain formal and have not yet become collaborative forums for formulating joint policies. Communication and task allocation have occurred, but are limited to the information dissemination stage. Key obstacles to this coordination include budget constraints, a lack of competent personnel, and low public awareness and participation in supporting mitigation programs. The lack of drainage construction in several affected villages also demonstrates weak inter-agency integration in program implementation.

This community service activity aims to provide education and technical recommendations related to energy efficiency and thermal comfort in the BIN Apartment building through simulations using DesignBuilder software. The purpose of the activity is to analyze and optimize the building’s energy consumption and ensure thermal comfort for the residents. The simulation results show that the building's Energy Use Intensity (EUI) is relatively low for the residential category, based on calculations made by the BGH team. The air conditioning (AC) system in conditioned spaces meets the thermal comfort standards according to ASHRAE, ensuring comfortable living conditions in these areas. However, in unconditioned areas, such as the family room, the Predicted Mean Vote (PMV) value reaches 1.5 (hot), indicating thermal discomfort. To address this issue, mechanical ventilation is recommended, with the capacity to produce an average air velocity of at least 0.6 m/s, which will improve airflow and enhance thermal comfort. Alternatively, adding an additional AC unit can also be considered, though it would result in a 20% increase in energy consumption. The findings and recommendations of this activity are expected to provide valuable insights and assist partners in making informed technical decisions when designing efficient and comfortable HVAC systems for vertical state-owned residential buildings. Ultimately, this program aims to optimize both energy usage and comfort, contributing to sustainable building management practices in the future.

This study aims to understand how learning about rainbows can improve elementary school students' understanding of basic science concepts, particularly regarding the refraction of light and the color spectrum. The concept of rainbows is an important part of Natural Science (IPA) lessons because it involves optical phenomena that can be directly observed and related to students' daily experiences. In this study, the method used is a literature study, namely by collecting, reviewing, and analyzing various relevant library sources, such as scientific articles, textbooks, and educational journals that discuss the topic of science learning and the rainbow phenomenon. The results of this study indicate that learning about rainbows can be done through various interactive and fun approaches, such as through practical experiments using prisms, water droplets, or other simple media that can demonstrate the process of refraction of white light into a color spectrum. In addition, the use of visual media such as images, animated videos, and digital simulations has also proven effective in helping students understand the process of rainbow formation more concretely. Creative activities such as drawing rainbows, making color models, or role-playing as light and water droplets can also increase active student participation and make learning more enjoyable. This study also emphasizes the importance of integrating rainbow learning into the elementary school science curriculum systematically and contextually. Rainbow materials not only introduce scientific concepts in a fun way, but also develop critical thinking, observation, and experimental skills in children. With the right approach, this learning can foster students' interest in science from an early age. Therefore, the results of this study are expected to contribute positively to the development of more effective, creative, and developmentally appropriate science learning methods for elementary school students.

A conductor, as a material that allows the easy flow of electric charge, plays a crucial role in various electrical and electronic applications. Understanding how elementary charges, particularly electrons, configure and move within a conductor, especially one with a square shape, is essential for analyzing and designing efficient electrical devices. This article discusses the configuration of elementary charges in a square conductor through simulations using a mechanics and electrodynamics approach, focusing on the interactions between charges to achieve a stable configuration. The simulation is conducted by placing charges randomly around the square conductor. The electro-dynamic interactions between charges cause them to arrange themselves in the most stable positions, where each charge interacts to minimize the system's energy. Although a stable configuration is achieved, fluctuations in the total system energy are still observed, approximately 1.33×10⁻³⁵ Joules. These fluctuations indicate that, despite stability, the system continues to experience dynamics that affect the overall energy. Particles at the corners of the conductor move faster than those on other sides, contributing significantly to the measured energy fluctuations. This charge configuration forms an electric field profile in the shape of a square, with the field being concentric, moving from the inside out of the conductor. This indicates that the electric field distribution is more concentrated inside and gradually decreases toward the outside. Furthermore, the distribution of particles on each side of the conductor is not uniform. There are deviations up to 4% from the expected distribution, and these fluctuations occur within a range of ±1 particle. This phenomenon provides deeper insights into the behavior of charges in a square conductor. Understanding this is important for designing electrical and electronic systems. Although the conductor reaches stability, the energy fluctuations that occur still play a role in optimizing electronic devices. The approach combining mechanics and electrodynamics is very useful for understanding the interactions between charges and electric fields, which can be applied to modern electrical technology.  

Cardiac arrest is a critical medical emergency with a high mortality rate that requires immediate and appropriate action to increase the chances of survival. One key factor in improving survival outcomes is the involvement of bystanders, particularly young people, in providing Basic Life Support (BLS). This community service activity was carried out to improve the knowledge and practical skills of youth organization members (Karang Taruna) in Kota Bambu Subdistrict, West Jakarta, in recognizing and responding to cardiac arrest using BLS procedures. The activity adopted the PDCA (Plan-Do-Check-Act) approach. The planning stage involved the preparation of materials and training tools for both theoretical and practical learning. The implementation phase included a 45-minute health education session covering the basics of BLS, especially cardiopulmonary resuscitation (CPR), followed by hands-on training. Participants were divided into small groups and guided through practical CPR simulations using manikins, facilitated by six trained nursing students. The activity was conducted on June 14, 2025, and attended by 57 participants, with 27 actively participating in the CPR practice session. The evaluation stage revealed a notable increase in the participants’ understanding and ability to perform CPR effectively. This indicates that community-based BLS training can be a powerful tool in improving emergency response at the grassroots level. In addition to raising awareness, the activity also empowered the youth as first responders in their community, strengthening their role in emergency preparedness and response. The follow-up stage emphasized the importance of sustainability through continued collaboration between local health professionals and community organizations. In conclusion, BLS education and training programs for youth can significantly enhance community resilience and are recommended for broader implementation in other regions.

This community service activity aims to improve the digital literacy of students at SMK Negeri 1 Pancur Batu through basic cybersecurity training. The background of this program stems from the students' low awareness of cyber risks such as phishing, data misuse, and weak digital account management. The method used was a participatory educational approach through training sessions, simulations, and group discussions. The results showed a 42% increase in students’ cybersecurity knowledge based on pre-test and post-test evaluations. Furthermore, behavioral changes were observed, including increased awareness of using strong passwords and the formation of a student cybersecurity group as change agents within the school environment. This activity demonstrates that participatory cybersecurity training can significantly enhance students’ awareness and digital skills.

Splinting training aims to improve everyone's ability to perform emergency care. The purpose of this study was to analyze the extent to which splinting training influences the ability to manage upper extremity injuries in adolescents using the splinting simulation method. This study was a quantitative study using a one-group pretest-posttest design with a sample of 40 adolescent medical students using a purposive sampling approach. Data were analyzed using the T-test. The results of this study showed that there was a significant difference in the skill level of the simulation group between pre and post (p <0.005). So it was concluded that splinting training using direct simulation can improve the ability to manage upper extremity injuries. Therefore, it is hoped that training using this simulation method can be used for all topics, learning types, and every domain; cognitive, affective, psychomotor and interpersonal.

The agricultural sector has a vital role in meeting national food needs, improving community welfare, and strengthening regional food security. However, the sector still faces various challenges, including land limitations, climate change, price fluctuations, and low production cost efficiency. Therefore, innovation is needed through the application of digital technology that is able to increase the productivity and sustainability of farming businesses. One of the solutions offered is the use of Artificial Intelligence of Things (AIoT), which is the integration of artificial intelligence (AI) with the Internet of Things (IoT) that allows agricultural systems to run more intelligently, efficiently, and scalably. This community service activity was carried out with the Satria Tani Hanggawana Farmers Group located in Kalisapu Village, Slawi District, Tegal Regency, with the main focus on premium melon cultivation. The method of the activity included material presentations on the concept of smart farming, the introduction of IoT-based sensor devices for monitoring temperature, humidity, and plant nutrition, field practices in greenhouses, simulations of the use of AI-based applications for crop prediction, and interactive discussions. In addition, material was also provided on simple agribusiness management, financial recording, and crop marketing strategies so that farmers are able to manage their businesses more professionally. The results of the activity showed a significant increase in participants' knowledge related to the application of AIoT in modern agriculture. Farmers not only understand the benefits of technology, but are also able to practice using tools and applications directly. The enthusiasm of the participants was reflected in their active involvement in discussions, willingness to try new technologies, and awareness of the importance of innovation to face agricultural challenges in the digital era.

This community service program aimed to enhance the safety compliance and service quality of gas station (SPBU) operators in Semarang through a structured refresher training initiative. The training was conducted over eight days and involved 120 participants from eight different SPBU locations. The program adopted a comprehensive approach by combining theoretical sessions, practical simulations, and role-playing exercises tailored to address real-world scenarios faced by SPBU personnel. Key training components included emergency response protocols, customer service excellence, complaint management, and adherence to safety procedures. The outcomes of the program showed measurable improvements. Post-training evaluations revealed a significant increase in participants’ knowledge and understanding of operational safety and service standards. Additionally, a notable reduction in emergency response times was observed during simulated drills. Feedback collected from the participants indicated enhanced confidence in handling routine operations, responding to customer complaints, and executing emergency procedures. This reflects the program’s success in not only increasing technical competence but also in boosting the professional demeanor of SPBU staff. Despite its success, the program encountered challenges, particularly in aligning the training schedule with participants’ daily work commitments, which occasionally hindered full attendance. To ensure long-term impact and continuity, the program recommends implementing annual refresher training sessions in collaboration with local safety and regulatory authorities. This would foster a culture of continuous improvement and compliance among SPBU operators, ultimately contributing to safer and more efficient fuel service operations in the region. Overall, the initiative highlights the critical role of ongoing professional development in enhancing service delivery and maintaining high safety standards in the fuel retail sector.

This study aims to determine the extent to which mental ability influences volleyball underhand passing skills and strategies for improving them in seventh-grade students at MTs SA Atholibiyah Bumijawa. The mental abilities studied included learning motivation, concentration, and self-confidence, as all three are considered important factors in supporting sports performance. The study used an experimental survey method with a correlation approach. The sample was determined through a purposive sampling technique, meaning only students who were actively involved in volleyball learning were included as respondents. The research instruments included a questionnaire to measure students' mental ability levels and an observation sheet to assess underhand passing skill practice. Data analysis was conducted using a correlation test to identify the relationship between mental ability and underhand passing skills, and regression analysis to measure the magnitude of the effect. The results showed a significant effect of mental ability on underhand passing skills. Students with high learning motivation tend to be more enthusiastic and consistent in practicing. Good concentration enables students to control movements, maintain balance, and manage timing when passing. In addition, strong self-confidence encourages students' courage in making decisions and reduces technical errors. This results in passing skills with more accuracy, control, and optimal timing. Improving strategies that can be implemented include structured training with the use of assistive devices to enhance technique, providing motivation and positive feedback from teachers to maintain enthusiasm, and focused training such as game simulations to strengthen concentration. The findings of this study confirm that mental development plays a crucial role in learning sports skills, particularly volleyball, thereby improving both the quality of learning and student achievement.

The development of digital technology has brought about significant changes in people's transaction patterns, particularly with the increasing use of online platforms for buying and selling. This phenomenon provides convenience for consumers and merchants, but is also accompanied by a high rate of online fraud experienced by both consumers and merchants. This fraud can take the form of fraudulent transactions, goods not received, or identity fraud. Low public legal literacy regarding rights and obligations in digital transactions is one of the main causes of weak legal protection for fraud victims. Many consumers and merchants are unaware of their rights and the legal procedures to take when experiencing fraud. This community service activity aims to increase the legal understanding of the public, especially online merchants and consumers, regarding digital consumer protection and legal fraud handling mechanisms. The activity implementation methods included interactive legal counseling, distribution of closed-ended questionnaires, case study simulations, Q&A discussions on legal issues, and light consultations. A total of 60 respondents, consisting of 30 merchants and 30 consumers, participated in the closed-ended questionnaire. The results showed that the majority of participants did not fully understand their rights in digital transactions and were unaware of the legal procedures to take when experiencing fraud. Despite this, participant interest in legal education was very high, with over 75% stating they wanted further legal assistance. This activity is expected to provide the public with better insight into their rights and obligations in digital transactions, as well as raise awareness of the importance of legal protection in the digital age. This is expected to make the public more vigilant and protected from potential online fraud in the future. Furthermore, increased legal literacy is expected to create a safer and more trustworthy digital transaction ecosystem for all parties.

Osteoporosis is a metabolic bone disorder characterized by a decrease in bone density and strength, making bones more fragile and susceptible to fractures. People with osteoporosis often complain of pain. One of the pain management methods for osteoporosis patients is progressive muscle relaxation. This community service activity empowers the public to practice progressive muscle relaxation techniques. The pre-test results showed that the majority of the community’s knowledge about osteoporosis and pain management was in the poor category, at 79.5%. After education and simulation of the progressive muscle relaxation technique were conducted, there was an increase in the community’s knowledge about osteoporosis and pain management, with 61.4% in the good category. The conclusion of this community service activity is that empowering the community to independently perform progressive muscle relaxation techniques is very beneficial in reducing pain in people with osteoporosis.

In the evolving dynamics of Indonesia's economy, unsecured loans or Kredit Tanpa Agunan (KTA) have rapidly grown as a popular financial solution. The ease of application and fund disbursement makes these products especially attractive to micro-entrepreneurs and lower-middle-income communities. However, behind the convenience lies a serious issue: a high rate of default or breach of contract (wanprestasi). This problem is exacerbated by the low level of legal literacy among the public, leading to a lack of understanding of their rights and obligations in financing agreements. Most individuals are also unaware that there is a faster, simpler, and low-cost legal mechanism available for resolving civil disputes—namely, the Small Claims Court procedure, as regulated by the Supreme Court Regulation (Perma) No. 4 of 2019. This mechanism can be utilized by the general public, especially clients of microfinance institutions and credit cooperatives, to resolve civil conflicts involving claims of up to IDR 500 million without going through complex litigation. To address this issue, this community engagement activity aimed to improve public legal understanding of the Small Claims Procedure through participatory-based training. The training involved 50 participants from microfinance institutions and savings and loan cooperatives. The methods used included legal counseling, mock court simulations, group discussions, and case studies to provide participants with practical knowledge of the procedures and benefits of filing small claims. The results of the activity indicated that 78% of participants reported a better understanding of the Small Claims mechanism after the training, and 65% stated they were more inclined to use it compared to conventional litigation routes. This training had a positive impact on raising legal awareness, potentially reducing default rates, and contributing to the development of a more inclusive, fair, and sustainable financial system.

Integral equations are essential tools in applied mathematics, with wide-ranging applications in fields such as physics, engineering, and finance. However, solving these equations presents significant challenges, particularly when dealing with complex, high-dimensional, or singular problems. Traditional methods, such as manual analytical techniques or direct numerical approaches, often struggle with computational efficiency, especially for large-scale systems, and may not be suitable for handling ill-conditioned problems. This study aims to develop an efficient numerical method for solving integral equations by combining adaptive quadrature techniques with Python-based iterative solvers. The adaptive quadrature method adjusts the step size dynamically based on error estimates, ensuring high accuracy even in the presence of singularities or near-singularities, which are common in many real-world problems. The iterative solver, based on Krylov subspace methods, enhances computational efficiency by reducing memory usage and improving the convergence speed of the solution. By using these techniques together, the proposed method significantly improves the computational time required to solve large-scale and complex systems of integral equations, while maintaining satisfactory accuracy. The results demonstrate that the adaptive quadrature technique, when combined with the Python-based iterative solver, offers a substantial advantage in both speed and precision compared to traditional methods. The proposed method is especially effective in handling complex, high-dimensional systems and ill-conditioned problems, making it a powerful tool for applied mathematics, physics, and engineering applications. In conclusion, this study presents a robust and efficient approach for solving integral equations, with potential for future research in solving non-linear and multi-dimensional integral equations.

This research explores the effectiveness of heuristic techniques for solving combinatorial optimization problems, with a particular focus on the Traveling Salesman Problem (TSP). Combinatorial optimization is a critical area of study, especially in fields like computer science, engineering, and economics, where finding optimal solutions from a finite set of possibilities is crucial. However, the NP-hard nature of many combinatorial problems, such as the TSP, makes traditional exact methods like Branch-and-Bound and Dynamic Programming computationally expensive and inefficient for larger problem sizes. The primary objective of this research is to evaluate the performance of heuristic methods, including Simulated Annealing (SA), Genetic Algorithms (GA), and Iterative Computation techniques, such as Tabu Search (TS) and Particle Swarm Optimization (PSO). These methods are tested for their ability to provide approximate solutions efficiently. The findings reveal that while ACO provided the best solution quality, it had the longest runtime. TS was the fastest, though with slightly lower solution quality. SA and GA demonstrated a balance between solution quality and computational efficiency, but their performance heavily depended on parameter tuning. The hybridization of SA and GA showed potential for improving solution quality but introduced additional complexity. The research concludes that heuristic methods, especially when combined, offer viable solutions for large-scale combinatorial optimization problems, though the trade-off between solution quality and computational time must be considered when selecting an algorithm.

This study focuses on the development and implementation of “Pasar Kita,” a web-based marketplace system designed to facilitate digital transactions for traditional market sellers and consumers. The system was developed using PHP as the backend programming language and MySQL as the database management system. The purpose of this project is to address the digital gap experienced by traditional market vendors who have limited access to modern e-commerce platforms. The research includes a needs analysis, system design using UML diagrams, implementation of main features such as registration, login, product management, transactions, checkout, and order tracking, followed by system testing. The results show that all major functions operate properly, including user authentication, product uploads, order processing, and payment simulations via transfer or cash-on-delivery (COD). System testing indicates that the platform meets usability, functional, and responsiveness criteria. The findings highlight the system’s capability to support local economic digitalization by providing an accessible and user-friendly marketplace for traditional market vendors and consumers.

This community service program aims to improve the capacity of 25 raw cassava chip MSMEs in Solok Regency through holistic training that integrates managerial, collaborative, and spiritual aspects. The activities are designed with the real needs of business actors in mind, both in terms of technical business management skills and strengthening business ethics values. The training is conducted in a classical manner through the delivery of entrepreneurship and financial management materials covering basic business management concepts, simple marketing strategies, and cash flow management. In addition, participants participate in group simulations and ice-breaking games to foster a spirit of collaboration and build trust among business actors. Assistance in financial recording practices is carried out using the financial records application v1.1, which is designed to facilitate recording daily transactions, tracking production costs, and simple profit and loss analysis. A special contemplation session is also held to foster awareness of ethics and spirituality in entrepreneurship, including the importance of honesty, social responsibility, and sincere intentions in running a business. The program is evaluated through a 20-question digital quiz taken by all participants. The evaluation results show a significant increase in the understanding of basic management concepts, cash flow recording skills, and a responsible attitude in managing the business. These findings confirm that a values-based training approach combined with hands-on practice can effectively strengthen the foundations of MSME sustainability, both in terms of operational performance and moral resilience. Given the positive results, this program is recommended for replication in other regions with similar business characteristics. Continued support from local governments, educational institutions, and business partners is essential to expand the program's impact, ensure business sustainability, and foster competitive and integrated community-based economic growth.

This study focuses on the development of an interactive web-based learning platform for Proportional-Integral-Derivative (PID) control systems, aimed at addressing the conceptual challenges faced by electrical engineering students when learning PID through conventional teaching methods. Despite its foundational role in control theory, PID remains difficult to grasp without practical visualization and hands-on experimentation. To bridge this gap, the research introduces a practical and accessible platform that enhances conceptual understanding through real-time simulations and physical interaction. The proposed system integrates key hardware components including an ESP-32 microcontroller, DC motor, rotary encoder, BTS 7960 motor driver, and I2C LCD. The platform’s web interface is built using HTML, Tailwind CSS, and JavaScript, enabling intuitive user interaction. Motor response data is captured via the ESP-32 and transmitted to the web interface using the WebSocket protocol, allowing users to instantly visualize system behavior as PID parameters (Kp, Ki, Kd) are adjusted. This dynamic feedback mechanism enables students to observe changes in system characteristics such as rise time, overshoot, and settling time in real time. To evaluate the platform’s feasibility, practicality, and educational effectiveness, beta testing was conducted among electrical engineering students using Likert-scale questionnaires. The results demonstrated that users were able to successfully interpret the impact of PID tuning on system performance. The average evaluation score reached 75.13%, indicating strong agreement regarding the platform’s educational value and its effectiveness in enhancing learning outcomes. In conclusion, the study affirms that the developed web-based platform offers a feasible, engaging, and pedagogically effective alternative to traditional learning approaches. By combining interactive simulations with physical experimentation, the platform significantly improves students’ understanding of PID control systems.

This study aims to develop interactive learning media for logic gate material in Industrial Electronics Engineering subjects at SMK Negeri 5 Batam by utilizing Adobe Flash CS6 integrated with CircuitVerse. This media is designed to provide a more interesting, interactive, and applicable learning experience, so it is expected to improve students' understanding of the concept of logic gates which is a basic material in the field of electronics. The study uses a Research and Development (R&D) approach with a 4D development model that includes the Define, Design, Develop, and Disseminate stages. Research data were collected through validation by material experts and media experts, as well as practicality tests involving students. Data collection instruments were in the form of validation sheets and student response questionnaires. The validation results showed that the developed learning media obtained a score of 88.20% from material experts and 93.88% from media experts, both of which are in the "very valid" category. The practicality test involving grade XI students obtained a score of 92.80%, indicating that the media is "very practical" to use in the learning process. This interactive media combines elements of text, images, animation, and digital circuit simulations using CircuitVerse, so students can learn logic gate concepts visually and directly practice them virtually. This integration not only makes it easier for students to understand the theory but also trains problem-solving and critical thinking skills. The findings of this study indicate that interactive learning media based on Adobe Flash CS6 and CircuitVerse has great potential to increase learning motivation, student engagement, and conceptual understanding of logic gate material. This media is also relevant to support the implementation of the Independent Curriculum, which emphasizes project-based learning, independent learning, and complete competency mastery.  

The application of proper cough etiquette is an essential part of Clean and Healthy Living Behavior (PHBS) and serves as a preventive measure in reducing the transmission of respiratory infectious diseases from an early age. Health education for young children is crucial, as this stage represents the formative period where foundational habits are developed, potentially influencing long-term individual and environmental health. This community service activity was conducted on May 9, 2025, at Stella Maris Kindergarten in Tangerang City, involving 29 Nursery group children. The main objective of the program was to enhance the knowledge and skills of early childhood students in practicing correct cough etiquette and to instill healthy behaviors that they can apply in their daily lives at home and school. The implementation of the activity followed the POAC approach (Planning, Organizing, Actuating, Controlling) in a structured manner. Activities included storytelling (using engaging illustrations), screening of age-appropriate educational videos, practical simulations of cough etiquette, and fun, interactive games. These methods were designed to encourage active participation and ensure that children could understand and retain the health messages through enjoyable learning experiences. The results showed a notable improvement in the children's understanding and active involvement in practicing healthy coughing techniques, such as covering their mouths with a tissue or the inside of their elbows when coughing. Visual education combined with hands-on practice proved to be highly effective in conveying health messages to young children. The teachers responded positively to the program, emphasizing that the approach used was appropriate and should be widely implemented in other early childhood education institutions. They recognized it as a valuable promotive effort and a long-term health investment for children, laying the groundwork for healthier habits and environments in the future.