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Green Open Space (GOS) is an essential element in urban spatial planning that functions to maintain air quality and ecosystem balance. This research aims to analyze the influence of GOS on the concentration levels of Carbon Dioxide (CO2​) in the urban area of Jayapura City. The study locations were focused on two areas with distinct characteristics: Jalan Sam Ratulangi, which has high vegetation coverage, and Jalan Percetakan, which is dominated by built-up areas and dense commercial activity. The methods used include spatial analysis utilizing Landsat 8 satellite imagery Band 4 (Red) and Band 5 (NIR) to calculate the NDVI (Normalized Difference Vegetation Index), a vegetation time series analysis from 2019–2024, and direct CO2​ concentration measurements taken at three different times (morning, noon, afternoon). The data was processed using ArcGIS with the Kriging Interpolation method to generate spatial distribution maps of CO2​ in both locations. The results show that Jalan Sam Ratulangi has a GOS area of 6.13 ha (94%), while Jalan Percetakan has only 2.95 ha (31%). This difference significantly impacts CO2​ levels, with an average concentration of 484 ppm at Sam Ratulangi, which is lower than Percetakan's average of 567 ppm. The highest CO2​​ value at Percetakan reached 649 ppm during the afternoon, whereas Sam Ratulangi recorded only 488 ppm. This study proves that the wider and healthier the GOS, the lower the CO2​​ concentration detected. These results demonstrate that vegetation plays a significant role in reducing carbon emissions in urban areas, supporting the crucial role of GOS in maintaining air quality and supporting sustainable urban development in Jayapura City.

This study aims to analyze and improve the quality control of packaging printing production at PT XYZ by applying the Lean Six Sigma methodology. Lean Six Sigma combines waste reduction principles with statistical quality control to achieve operational excellence. The research identifies major production challenges, including high defect rates, overproduction, and ineffective inventory management, all of which contribute to increased costs and reduced efficiency. The DMAIC framework—Define, Measure, Analyze, Improve, and Control—was employed to systematically address these issues. During the Define and Measure phases, types of waste were identified and defect rates were calculated using Defects Per Million Opportunities (DPMO). In the Analyze phase, root causes were examined using a Fishbone (Ishikawa) diagram, highlighting factors related to manpower, materials, machines, and methods. The analysis revealed a sigma level of 3.2, indicating a moderate level of process quality and substantial room for improvement. To address the identified issues, several improvement strategies were proposed. These include implementing a Just-In-Time (JIT) system to reduce inventory waste, adopting the First-In-First-Out (FIFO) inventory method for better material rotation, and conducting targeted technical training for operators to minimize human error. In the Control phase, the study suggests process standardization, routine inspections, and continuous monitoring as key practices to ensure that improvements are sustained over time. The findings and recommendations from this study are expected to contribute to better quality control, reduced operational waste, and enhanced productivity in the packaging printing process. Ultimately, this approach aims to strengthen PT XYZ’s competitiveness in the printing industry by fostering a culture of continuous improvement and quality excellence.

 Toko Percetakan Zacky Karya Abadi masih mengelola data stok dan penjualan secara manual, yang menimbulkan berbagai tantangan operasional. Penelitian ini bertujuan untuk merancang dan membangun sebuah sistem informasi berbasis web guna menyederhanakan dan mengotomatisasi proses tersebut. Metode pengembangan yang digunakan meliputi tahapan observasi, wawancara, serta perancangan sistem menggunakan alat bantu seperti Activity Diagram, Usecase Diagram, dan ERD, yang diimplementasikan dengan PHP dan MySQL. Hasilnya adalah sebuah sistem informasi terintegrasi dengan akses berbasis peran untuk pemilik, admin, karyawan, kasir, dan pelanggan. Sistem ini memiliki fitur modul manajemen stok, transaksi penjualan, pengelolaan pengguna, dan pelaporan operasional otomatis. Implikasi dari sistem ini adalah peningkatan efisiensi operasional secara signifikan, pengambilan keputusan yang lebih cepat dan akurat melalui laporan real-time, serta meminimalkan risiko kehilangan data.

Currently, MD Drafika faces challenges due to a lack of proper inventory management, such as safety stock regulations and reorder schedules. This has led to inventory levels that often fail to meet customer demand. The objective of this research is to optimize inventory costs at MD Drafika to enhance cost efficiency. This study employs a descriptive quantitative method, utilizing data collected through observation and interviews to explain the relevant aspects of the research object. The results of the research reveal an optimal order quantity and a reduction in inventory costs. Inventory optimization was achieved by adjusting safety stock levels and reorder points. The calculations for 2023 showed an optimal order quantity of 3,349 pieces, with four purchasing cycles within the period. The safety stock was determined to be 945 pieces, and the reorder point was 992 pieces. The cost difference between the EOQ method and the company’s current approach amounted to IDR 1,179,928.

This community service activity is motivated by the low level of workers’ awareness and understanding of Occupational Safety and Health (OSH) implementation in the printing and binding industry in Gedangan, Sidoarjo. The purpose of this program is to optimize OSH implementation through participatory education to improve workers’ knowledge and safe work behavior. The method used is a participatory approach involving problem identification, focus group discussions (FGD), interactive education, technical training, as well as mentoring and evaluation through pre-test and post-test. The results show a significant increase in workers’ understanding, with average scores rising from 56.25% to 83.75% (an increase of 27.5%). In addition, behavioral changes were observed, including improved compliance in using personal protective equipment (PPE) and the ability to identify workplace hazards. The program also resulted in the formation of OSH cadres as local change agents. Therefore, participatory education has proven effective in improving OSH implementation and fostering a sustainable safety culture.