Elementary school teacher performance plays a pivotal role in enhancing the learning process. This study investigates key elements that affect teacher performance, including personal (internal) aspects, environmental (external) influences, leadership from school principals, and levels of teacher professionalism. Using a literature review approach, the study compiles data from relevant sources. The results reveal that teacher performance is shaped by motivation, satisfaction at work, support from school management, and both pedagogical and professional competence. This suggests that improving teacher effectiveness requires a holistic strategy. The study implies the importance of formulating education policies that continuously support teacher development and strengthen leadership to foster a productive educational climate.

Research on the development of PowToon-based video learning media on the material on the definition of angles and various angles. The purpose is to discover the development of Powtoon-based video learning media and the feasibility of Powtoon-based video learning media developed for grade III students of SDN Singajaya 01 through the learning process carried out at school. The method used in this study is the ADDIE method which consists of 5 stages, namely Analysis, Design, Development, Implementation, and Evaluation. In this study, a validation test was carried out on experts, namely media, language experts, and material experts. The results of the validation of media experts obtained as many as 96% with very feasible criteria. The results of the validation of the language experts obtained 100% with the feasible criteria, and the results of the validation of the material experts obtained 90% with very feasible criteria. The results of the student response questionnaire obtained as much as 92% with very feasible criteria. These results show that powtoon-based video learning media on the understanding of angles and various angles has proven to be valid, interesting, innovative and very feasible to be used in the learning process. This study recommends the development of PowToon-based video learning media that can be used in classroom learning.

Educational research requires a thorough understanding of population and sample concepts as the foundation for ensuring the validity and generalizability of findings. This article explores the fundamental differences between population and sample, the implications of their selection on research outcomes, and appropriate strategies for selecting a representative sample. By reviewing commonly used sampling approaches, such as probability and non-probability techniques, this paper highlights the importance of aligning the method with the research objectives and context. A clear understanding of these concepts is crucial for researchers to produce accurate, reliable, and contextually relevant educational data.

This study aims to analyze the optimization of seaweed seedling inventory management using the Economic Order Quantity (EOQ) method to enhance cost efficiency for farmers in Tarakan City. The research employs a quantitative descriptive approach, integrating EOQ with forecasting techniques (Moving Average and Exponential Smoothing) to predict raw material needs accurately. Data were processed using Microsoft Excel and POM-QM for Windows to ensure precision. The results indicate that EOQ yields an optimal order quantity of 878 ropes per order, with a frequency of 6 orders per year, a reorder point of 16 ropes, and a total inventory cost (TIC) of IDR 842,681. Compared to traditional methods (TIC IDR 2,132,083), EOQ reduces costs by 60.5%. Forecasting analysis reveals that Exponential Smoothing (MAPE 19.67%) outperforms Moving Average (MAPE 22.5%) in accuracy. These findings highlight EOQ’s effectiveness in minimizing waste, preventing stockouts, and improving productivity. The study provides practical insights for coastal small-scale farmers and policymakers in the marine sector.

Social transformation brought by the Industrial Revolution 4.0 has led to the emergence of Society 5.0, where technology is integrated into all aspects of life. In education, this presents both challenges and opportunities, especially for teachers whose roles and responsibilities have become increasingly complex. This article aims to analyze the strategic role of teachers in shaping student competencies relevant to the demands of the 21st century. Using a descriptive qualitative approach and library research method, the study refers to constructivism, connectivism, and the 21st Century Skills Framework. The findings highlight that teachers must balance mastering educational technology with instilling character values in students. Their responsibilities include fostering critical thinking, communication, collaboration, creativity (4C), promoting digital literacy, and preparing students as global citizens. The study concludes that teachers are key agents of educational transformation in the Society 5.0 era, and their readiness in handling technological, pedagogical, and moral demands is vital to the future of education.

Diesel engines are essential for transporting heavy loads, requiring significant engine power. This study aims to evaluate the effect of adding PTT (diesel fuel conditioner) additives to Dexlite fuel, focusing on mixtures of D0, D1, and D2. Additionally, variations in fuel pre-heating and engine cooling system fluids are examined. This research employs an experimental approach with descriptive analysis. The findings indicate that the optimal torque occurs with the D2 mixture, achieving 136.57 N·m at 2267 rpm with standard coolant, 152.03 N·m at 2100 rpm with a 50%:50% fluid ratio, and 160.70 N·m at 2033 rpm with a 30%:70% fluid ratio, all without pre-heating. The optimal power values for the D2 mixture are 74.60 HP at 4600 rpm with standard fluid, 75.23 HP at 4100 rpm with a 50%:50% fluid ratio, and 78.03 HP at 4000 rpm with a 30%:70% fluid ratio, also without pre-heating. The average results show that the D1 and D2 mixtures improve torque values by 0.77% and 4.75%, respectively, and enhance power by 0.19% and 1.53% compared to pure Dexlite. In contrast, pre-heating at 50°C, 60°C, and 70°C resulted in a decrease in torque of 1.00%, 2.26%, and 3.62%, respectively, and a reduction in power of 0.56%, 2.29%, and 4.79% compared to normal temperature conditions.

This study aims to optimize sales profit at the MSME Batagor Bandung Tarakan by applying the Simplex method in linear programming, supported by the POM-QM for Windows software. Profit optimization plays a crucial role in strategic decision-making, particularly in determining the optimal daily production quantities to enhance operational efficiency, maximize the use of raw materials, and meet market demand effectively. The Simplex method was chosen for its ability to solve linear optimization problems involving multiple constraints and variables, providing accurate mathematical solutions to achieve maximum profit. This research utilizes daily production data as the basis for analysis, which is then processed using the Simplex method in POM-QM. The results show that implementing the Simplex method can increase daily profits from IDR 634,000 to IDR 831,408 through a more efficient production combination. The study concludes that the Simplex method, when applied via the POM-QM software, is an effective tool for daily production decision-making and can support MSMEs like Batagor Bandung Tarakan in improving their competitiveness and business sustainability.

In the automotive sector, which produces over 60-70% of global pollution emissions, the world faces difficulties in making the switch from fossil fuels to environmentally friendly renewable energy sources. Technology has advanced significantly, and companies such as Toyota and FiA are working to improve competitiveness and attract more manufacturers to produce hybrid cars. Reducing environmental impact and greenhouse gas emissions is the goal of the Formula 1 project, which partners with ARAMCO, one of the world's largest mining companies. Using the methodology of reviewing literature on energy-efficient fuels and adapting to Formula 1 vehicle regulations, with a special emphasis on hybrid strategies, to achieve net zero emissions by 2050. Research on the use of synthetic materials in fuels such as ethanol, ethanol, butanole, dimethyl methacrylate (DMM), and oxymethylethyl (OME) 3-5 has shown promising results in reducing greenhouse gas emissions. The transition to renewable energy sources is essential to reduce global pollution.

This project aims to implement the AIDA and StoryBrand models in writing the script for the Educourse company profile video, with the aim of increasing the effectiveness of business communication. This project uses a practice-based approach by compiling a structured script through the integration of the AIDA (Attention, Interest, Desire, Action) model to create a persuasive message and the StoryBrand framework to strengthen narrative coherence. The writing process includes identifying core messages, compiling an outline, and creating a final draft based on the principles of strategic communication and storytelling. The result of this project is a final script ready for production, containing the latest information about the company, user testimonials, and visual directions optimized for the YouTube digital platform. The application of both models allows for clearer, more engaging messages that are in line with Educourse's mission and audience. This project emphasizes the importance of implementing a structured communication model in media production and can be a reference in writing scripts that focus on branding strategies in the future. In addition, this project also contributes to the development of academic discourse in the field of digital content writing through the application of relevant theoretical approaches.

To improve the quality of education and learning in learning speaking in the English Education Department. Consideration of the lack of confidence in students caused by not knowing how to perform appropriately and well to appear confident to improve their speaking skill is also supported by the existence of appropriate learning media and can facilitate both students and teachers in learning to speak.  Therefore, researchers conducted research and development of Speech Practice book learning media namely “A Guide Speech Practice Book to Elevate Your Performance” The research aims to describe the design development and feasibility of the product. This type of research is Research and Development (R&D) which follows the procedure of Borg and Gall. Which includes ten stages and then simplified into five stages which include: need analysis, product development, expert validation, product try-out, and final product. After going through several stages, the product feasibility assessment was started based on the results of experts which included content experts and design expert. Based on validation from the content expert with an average value of 4.6 with a percentage of 92% with a very feasible category. The results of validation from design expert get an average value of 4.5 with a percentage of 90% with a very feasible category. Then the product validation results of student responses get a total score of 3064 with a percentage of 94.2% with a category very feasible. based on the results of research and field tests that have been described, it can be concluded that the speech practice book for students speaking skill at the English Education Department is very feasible to use for speaking learning.