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.

Mesin reng digunakan untuk memproduksi atap baja ringan jenis reng V belum sepenuhnya bekerja secara efektif. Hal ini ditunjukkan dengan adanya downtime, penurunan kecepatan produksi mesin, dan produk-produk yang tidak sesuai standard yang telah ditetapkan. Penelitian ini bertujuan untuk mengukur dan mengetahui tingkat efektivitas mesin reng dengan menggunakan metode Overall Equipment Effectiveness (OEE), mengidentifikasi faktor penyebab six big losses dengan menggunakan Fault Tree Analysis (FTA), dan memberikan usulan perbaikan untuk meningkatkan tingkat efektivitas mesin. Dari hasil penelitian, OEE mesin reng mencapai rata-rata 57,55%, dan masih berada di bawah nilai OEE ideal (85%). Usulan perbaikan yang direkomendasikan meliputi eliminasi six big losses, mengembangkan program pemeliharaan, dan memberikan pelatihan untuk meningkatkan kemampuan maintenance dan operasional. Abstract The reng machine, which is used to produce lightweight steel roof with a kind V reng, has not fully worked effectively. This is indicated by the presence of downtime, speed losses, and produce products that are not according to standards that have been determined. This study aims to measure and determine the level of effectiveness of reng machine using Overall Equipment Effectiveness (OEE) method, identify factors that cause six big losses by using Fault Tree Analysis (FTA), and proposes improvements to increase the effectiveness of the machine. The result of research, OEE of reng machine reached an average of 57.55%, and still was below the ideal OEE (85%). Proposed improvements that recommended include the elimination of six big losses, develop a maintenance program, and provide training to improve the ability of maintenance and operations.

Purpose: First, the purpose of this paper is to develop some policies as an alternative scenario to increase the performance of the Indonesian dairy milk supply chain so it can fulfil the target of the government. Second, this study aims to find the best alternative scenario based on the performance resulted from the simulation. Design/methodology/approach: The paper develops a system dynamics-based model by using six approaches, i.e. “population and consumption of dairy milk”, “national milk production”, “dairy cattle feed”, “dairy cattle population”, “profit gained by the dairy farmer”, and “government policy”. Findings: There is no best scenario; however, the combined scenario can give the better condition to achieve the targets set by the government. Research limitations/implications: The limitations of this study include: the relationship between the levels of welfare of farmers and the desire being a dairy farmer is not modelled; the quality of milk is only determined by the content of fat and protein in one litre of milk, and the level of milk consumption per capita increases naturally without any intervention or policy from the government. Practical implications: This study provides essential insights into the context of implementing the policies in the Indonesian dairy supply chain. Social implications: The research revealed that good policies scenario could be built after simulating and analysing the effect of each scenario on the performance of a dairy supply chain carefully. Originality/value: This study does not test one policy in isolation. It simultaneously tests various combinations of policy that related to dairy cattle import, operational assistance for dairy cooperative and dairy farmer that may help maximise the performance of the Indonesian dairy milk supply chain.

UKM Batik Kota Semarang masih berfokus pada mempertahankan usaha dan mendapatkan keuntungan untuk kelangsungan produksi. Aspek keberlanjutan belum mendapat cukup perhatian. Penelitian ini bertujuan untuk melakukan penilaian keberlanjutan terhadap sistem produksi UKM Batik Kota Semarang menggunakan metode product-service system (PSS). PSS terdiri dari tiga dimensi keberlajutan yaitu lingkungan, sosial-budaya dan ekonomi yang masing-masing memiliki 6 kriteria. PSS bukan hanya menilai tingkat keberlanjutan tapi juga mengidentifikasi peluang pengembangan didasarkan dari peta sistem dan analisa SWOT. Perumusan rekomendasi menggunakan panduan berupa sebuah daftar periksa (check list). Selanjutnya, diagram kelayakan rekomendasi digunakan untuk menyeleksi dan menguji kelayakan rekomendasi yang diciptakan menggunaakan portofolio diagram. Penilaian keberlanjutan yang dilakukan memberikan hasil nilai rata – rata 0,103 yang berada dalam kategori “rendah”. Rekomendasi yang dihasilkan untuk dimensi lingkungan antara lain menerapkan penggunaaan bahan baku dan air yang optimal, melakukan daur ulang dari limbah pewarna buatan, penggunaan bahan baku bio-degradable. Pada dimensi sosial budaya rekomendasinya adalah penggunaan alat pelindung diri bagi pekerja. Pada dimensi ekonomi direkomendasikan untuk mengidentifikasi kelompok sasaran, menerapkan strategi yang menghasilkan produk lebih menarik bagi pelanggan dan menciptakan diversifikasi dalam penawaran batik. Rekomendasi ini kemudian digambarkan dalam sebuah diagram berupa radar keberlanjutan

High competition in the era of globalization requires repair and improvement over all of the academic community in Indonesia, including the students. This makes the students compete in their studies and potentially cause mental studyload which could have implications for many things. This study aims to determine the level of mental load among the students of the Department of Industrial Engineering Undip in semesters 3 and 5 using the NASA-TLX, with respondents as many as 50 students. In addition, this study try to find out the NASA-TLX’s dominant scale perceived by students and trying to prove, whether external factors such as previous semester grade point, study hours per day, entrance selection exam and free-time activities affect the score of mental load or not. The results of the mental study load measurement shows that the average score of mental study load of 80.04 (ponderable). For the dominant scale, the scale is Temporal Demand. Analysis of Variance (ANOVA) for external factors indicate that these factors do not have a significant influence on the existing score of the mental study load.

This study aims to identify the underlying barriers that may prevent public policy coordination among stakeholders in dealing with food security in Central Java Province and suggest recommendations to enhance the coordination. This study used primary data from a questionnaire that the six government agencies’ experts filled out. These experts were asked to identify the relevance and the importance of each barrier and formulate a suitable policy recommendation. There were three data processing techniques used in this study: Content Validity Analysis, Interpretative Structural Modelling (ISM) Method, and Delphi Method. The result of the Content Validity Analysis indicated 22 valid barriers. The result of the ISM method indicated eight barriers occupied the topmost level (complicated problems, insufficient sharing of information, ambiguities and lack of clarity, gap of coordination implementations between the rules and policies with the actual practice, fewer budget allocations, different aims and priorities, lack of motivation to collaborate among stakeholders from various disciplines, and weak of infrastructure). The result of the ISM method also indicated three “very significant” barriers: inadequate human resources, the limited capability of the regional government, and lack of communication and high specialization in multisector collaboration. Then, the result of the Delphi Method indicated several recognize policies to mitigate those barriers. Moreover, related to the limitation of this study, future studies should focus on the barriers in diverse places nations or compare different regions or countries; include more experts from the various stakeholder group, and test the recognized policies in the real world.