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The use of technology in elementary school learning plays a crucial role in improving the quality of the educational process. One frequently used tool is the infocus (LCD projector), which serves to present learning materials in visual and audiovisual forms. The purpose of this study was to assess the effectiveness of using infocus-based learning media in elementary schools and its impact on student learning. The method used was a qualitative approach, collecting data through observation, interviews, and documentation. The results showed that the use of infocus can improve students' concentration, motivation, and understanding of the subject matter, as the presentation becomes more engaging and easier to understand. However, the use of infocus in elementary schools still faces various challenges, such as limited facilities and infrastructure, teacher readiness to operate the equipment, and technical problems such as power problems and additional devices. Therefore, supporting facilities and improving teacher skills are needed to ensure the effective and sustainable use of infocus as a learning medium.

This study examines the price elasticity of fresh cow’s milk on the demand for raw materials at Anisa Yoghurt Company using a demand theory approach. Milk is the main input in yoghurt production, making price fluctuations potentially influential on production decisions. The objective of this research is to analyze the responsiveness of raw milk demand to price changes and to identify the elasticity characteristics of milk demand in a small-scale food processing business. This study employs a quantitative case study method using primary data collected through weekly observations of milk prices and quantities purchased over a three-month period, from September to November. The analysis applies the midpoint elasticity formula to measure price elasticity of demand. The findings indicate that the demand for raw milk is consistently inelastic across the observed periods, as shown by elasticity values with absolute magnitudes less than one. Both price decreases and increases result in relatively small changes in the quantity demanded, indicating low sensitivity of demand to price fluctuations. These results suggest that raw milk is an essential production input, and purchasing decisions are driven more by production needs than by short-term price changes. The study implies that yoghurt producers should prioritize supply stability and production efficiency rather than adjusting purchase volumes in response to minor price changes. This research contributes empirical evidence on demand elasticity in dairy-based agro-industries, particularly at the small enterprise level.

Sleep quality is a crucial component of health and overall well-being among older adults, as the aging process is commonly associated with various physiological, psychological, and environmental changes that may significantly disrupt normal sleep patterns. Declining bodily functions, increased health problems, and changes in daily routines often contribute to sleep disturbances in later life. This literature review aims to analyze the factors influencing sleep quality in the elderly by synthesizing findings from relevant national and international studies published in recent years. Various factors were identified, including physiological conditions such as chronic diseases, pain, and hormonal changes; psychological factors such as anxiety, depression, stress, and cognitive decline; lifestyle-related factors such as levels of physical activity, dietary habits, medication use, and caffeine consumption; and environmental aspects including noise exposure, lighting conditions, temperature, and overall bedroom comfort. The reviewed literature consistently indicates that poor sleep quality is strongly associated with impaired physical health, reduced cognitive function, increased fatigue, and decreased emotional well-being in older adults. This review highlights the importance of comprehensive, multidisciplinary interventions that address both intrinsic and extrinsic determinants of sleep to effectively improve overall sleep quality among elderly populations.