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All Journal J@TI (TEKNIK INDUSTRI) Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Journal of Applied Engineering and Technological Science (JAETS)
Ega Rizkiyah
Institut Teknologi Sepuluh Nopember
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Industrial & Manufacturing Engineering

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Thermal Comfort and Cognitive Performance under Glass Facade Buildings Ega Rizkiyah; Manik Mahachandra; Ratna Purwaningsih; Heru Prastawa; Wiwik Budiawan
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 20, No 3 (2023): November 2023
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v20i3.523-533

Abstract

Glass is one of the most adaptable modern materials. However, the use of glass can have unfavorable effects such as glare, heat, and discomfort. This study focuses on the issue of designing contemporary glass buildings and facades in humid tropical environments to evaluate the thermal comfort of building occupants and assess its effects on the completion of cognitive tasks. The Wet-Bulb Globe Temperature (WBGT) parameter was used to measure thermal comfort, and the ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers) scale was used to assess thermal comfort perception. The Montreal Cognitive Assessment was used to assess eight female respondents’ cognitive abilities, and the cut-off point was 26. The WBGT has a temperature range of 25, 54°–28, 83°C, in terms of thermal sensation, 54% of respondents feel hot and 62% are uncomfortable. In the completion of cognitive tasks, 75% received a score of less than 26. The results show that there is an effect of thermal comfort on cognitive performance. Due to respondents feeling uncomfortable in high-rise buildings with glass facades, as well as with cognitive outcomes that are below the cut-off point, recommendations for improvement are needed to increase thermal comfort, such as double glass facades.
Waste Analysis of the International Delivery Service Process Using Lean Six Sigma in Logistics Service Provider Companies Ega Rizkiyah; Hari Supriyanto; Kumara Pinasthika Dharaka; Lestary Grace; Ivana Rahmaningtyas
Journal of Applied Engineering and Technological Science (JAETS) Vol. 6 No. 1 (2024): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37385/jaets.v6i1.5792

Abstract

International shipping poses challenges such as customs clearance delays, slow delivery speeds, and process bottlenecks, leading to time wasstage, increased costs, and potential profit losses. These issues impact specific processes and customer satisfaction. Lean Six Sigma offers a robust framework for identifying and eliminating waste in international shipping processes. Applying the lean service approach, we identified four key waste types in international shipping: delay, duplication, unnecessary movement, and error. However, a Pareto diagram highlighted delay and error as critical culprits, with sigma values of 1.85 for delay and 2.92, 3.46, 3.77 for the three error types, respectively. These low sigma values indicate significant room for improvement After conducting an impact analysis and failure mode analysis (FMEA), four improvement recommendations were proposed: the implementation of an online shipping form filling system, providing customs training to all counter employees, and creating SOPs for inspection processes at the warehouse. These recommendations form a roadmap for international shipping companies to embrace Lean Six Sigma, enhancing efficiency, reducing costs, and improving customer satisfaction.
LEAN-BASED OPTIMIZATION OF SMALL SCALE CONCRETE BLOCK PRODUCTION Kumara Pinasthika Dharaka; Ega Rizkiyah; Ardian Lintang Samudro
J@ti Undip: Jurnal Teknik Industri Vol 21, No 2 (2026): Mei 2026
Publisher : Departemen Teknik Industri, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jati.21.2.145-152

Abstract

This research addresses key inefficiencies in concrete block production within small-to-medium-sized manufacturers in Indonesia, where challenges such as long processing times, excessive motion, overstocking, and product defects significantly hinder productivity. The study aims to identify the root causes of these wastes and develop an integrated lean-based improvement strategy to enhance operational efficiency and product quality. A current state value stream mapping (VSM) analysis was conducted to visualize the production flow and identify non-value-added activities and bottlenecks. A Fishbone Diagram was then used to systematically determine the underlying causes of inefficiencies. To address ergonomic issues, the Rapid Upper Limb Assessment (RULA) method was applied to compare operator posture before and after tool modifications. Key improvements include standardized material measurements, optimized layout design to reduce transportation waste, a lever-press molding machine for improved ergonomics, and enhanced cement storage conditions. These interventions shortened the drying period from two months to 28–32 days and doubled the daily output from 300 to 600 blocks. Ergonomic evaluations showed a RULA score reduction from 5 to 3, indicating better posture and reduced fatigue. Overall, this study provides a practical framework for applying lean principles in small-scale construction material production.
Co-Authors Ardian Lintang Samudro Hari Supriyanto Heru Prastawa Ivana Rahmaningtyas Kumara Pinasthika Dharaka Kumara Pinasthika Dharaka Lestary Grace Manik Mahachandra Ratna Purwaningsih Wiwik Budiawan