The manufacturing industry is considered as one important sector, which has a significant influence on the economic growth of a country. The increase of fierce competition among products requires the company to satisfy their customers by making high-quality products with competitive prices and at on-time deliveries. This study aims to implement lean manufacturing in one of the furniture companies in Indonesia to minimize waste in the production floor. Value Stream Mapping (VSM) will be used as a tool to identify waste by separating value-added activities and non-value added activities in the production process. A future state map is developed with new and improved processes. Future state map makes the improved process more effective and more efficient. The critical waste found on the production floor in motion. Improvements are made using 5W1H techniques and ECRS principles, two simple tools of kaizen. The workload of operator consideration was also done to avoid bottlenecks and decrease the lead time. The result was quietly remarkable as the lead time decreased by around 4.79% and able to balance the workload received by the operator.

The design of facility layout is an influential factor in a company’s performance to support the streamlined process of production. PT. PMJ is one of the garment industries that produce women’s underwear. The total processing time in the sewing department often exceeds the standard time set by the company. The composition of the machine and facilities at the sewing department is considered to be not optimal. The order of machines in the production line has not been arranged appropriately which causes the excessive distance in the material transfer. In addition, the uses of straight material flow cause the workers to rotate their posture of the body when taking the materials. Based on the results of the assessment of the condition of workers in the initial facility layout using the Quick Exposure Check (QEC) method, the highest total exposure score is on the back. This study aims to redesign the facility layout of PT. PMJ using Systematic Layout Planning (SLP) and ergonomics approach to minimize total material handling cost. Two design alternatives are proposed and the performance of each design is evaluated using ARENA simulation software. Based on the calculation of total material handling cost and simulation, the second proposed facility layout was chosen since it was able to reduce the total material handling cost by 22.92% and material transfer time by 34.01%.

A pervasive environmental stressor is one that damages mental and physical health as well as cognitive abilities by producing noise at a specific frequency and level. Current noise pollution levels pose a significant threat to public health, potentially leading to impaired cognitive function, increased stress, and other negative health consequences. This study aims to investigate the relationship between noise exposure and human cognitive abilities using a comprehensive analysis of power spectrum density (PSD) derived from EEG signals. Twenty-four participants completed the experiment to identify the effect of exposure to different noise levels (55 dB, 65 dB, 70 dB, 75 dB, 80 dB, and 85 dB) and two types of continuous and intermittent noise. The Stroop Color–Word Test and the Emotive Epoch EEG are cognitive task instruments used during experiments. Behavioral performance (accuracy and response time) and power spectrum electroencephalographic density were collected and analyzed. The methodology involved collecting EEG data from participants exposed to controlled noise stimuli and a subsequent PSD analysis to uncover frequency-specific patterns associated with cognitive processes. Attention levels were measured by examining beta wave activity, while stress responses were evaluated through an alpha wave analysis. Additionally, mental workload was assessed by considering the overall distribution of PSD through the theta-to-alpha ratio. The results revealed a significant relationship between the exposure to noise types and levels and human cognitive ability. The analysis of the power spectrum density on the cognitive aspects of attention and stress yielded results indicating that participants were in the best attention condition and in a relaxed or unstressed state when exposed to noise levels of 65 dB in both continuous and intermittent noise types. For the mental workload aspect, participants exposed to both continuous and intermittent noise types at a noise level of 70 dB began to indicate the presence of mental workload. These findings supported the importance of considering the impact of environmental noise on human cognitive well-being and demonstrated the potential of EEG monitoring as an objective tool for assessing the impact of noise on cognitive performance.

Wastes in a production line of a bra model in a textile and textile products industry were identified, and this study aims at minimizing them, and by consequence delays in the delivery of products to consumers. The type of waste was identified employing the Waste Assessment Model approach, and the results show that unnecessary motion is the most predominant one. By eliminating and simplifying activities are not value-added, it was possible to accelerate the production time of the model Bra by 3 minutes and increase the average value of line efficiency by 6.17%.

PT. Nusa Palapa Gemilang merupakan sebuah perusahaan yang bergerak di industri pupuk NPK dan non NPK. Berdasarkan hasil observasi didapatkan beberapa potensi bahaya kerja, salah satunya adalah karena kurangnya kesadaran pekerja mengenai keselamatan dan kesehatan kerja (K3). Penelitian ini bertujuan untuk mengidentifikasi potensi kerja untuk mengantisipasi kecelakaan kerja. Penelitian ini menggunakan Hazard and Operability Study (HAZOP) untuk menganalisis potensi hazard di unit produksi NPK 1. Berdasarkan klasifikasi hazard setelah dilakukan penilaian risiko, hasil penilaian risiko menunjukkan sebanyak 95% potensi hazard merupakan hazard tingkat risiko tinggi (high) dan sebanyak 5% potensi Hazard merupakan hazard risiko sedang (moderate). Selain itu, ditemukan sebanyak 14 potensi hazard yang dapat diklasifikasikan menjadi empat tipe hazard yaitu sikap kerja, prosedur kerja, tempat kerja, dan kondisi lingkungan kerja. Rekomendasi yang diberikan berdasarkan klasifikasi bahaya berupa himbauan pekerja untuk menggunakan APD berupa masker, helmet, safety spectacles, dan sepatu safety. Selain itu, diperlukan rambu-rambu seperti rambu wajib penggunaan APD, rambu bahaya forklif, dan rambu lantai licin sebagai peringatan kepada pekerja bahwa terdapat risiko bahaya saat berada di tempat kerja, sehingga K3 di tempat kerja dapat ditingkatkan dan dapat memiminimalkan kecelakaan kerja.

The condition of the grand mosques in the Boyolali, Surakarta, and Karanganyar areas currently does not consider facilities that can accommodate people with disabilities. This study aims to improve the accessibility of mosque facili-ties and provide proposals for designing facilities that are accessible for mosque worshipers, including those with disabilities. The object of this re-search consists of several great mosques located in Boyolali, Surakarta, and Karanganyar. The accessible congregation is used to conduct access audits using a questionnaire to assess the level of accessibility as well as to deter-mine the priority of the selected mosque, and then design the mosque facili-ties using AutoCAD software concerning the Regulation of the Minister of Public Works and Public Housing No. 14 of 2017. The results of the congregation show that 4 mosques are not accessible and 1 mosque is less accessible. Based on the analysis, it shows that the Madaniyah Great Mosque located in Karanganyar was chosen to be the object of the proposed improve-ment because it has the highest accessibility index value and the current condition of the mosque is the most likely to be repaired, so that mosque facilities are accessible for people with disabilities. The proposal to improve facilities at the Great Madaniyah mosque is to provide a unique parking lot with a size of 5 m x 2.3 m, provide an incline with a slope of 5° and have handrails on both sides, provide two types of ablution places, namely with a seat and no seat, provide toilets equipped with kick plates, automatic hinges, panic buttons, and handrails; provide lifts with handles on all sides and a lift size of 120 cm x 230 cm; provide signs or signs in unique parking lots; add signposts; provide a particular prayer area and a special lane located close to the entrance to the prayer area.