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Lighting and Color Preferences in Hajj Dormitory Bedrooms: Impact on Visitors’ Subjective Well-Being
Full text linkThe design of interior spaces significantly influences the subjective well-being of occupants, shaping their emotional states, comfort, and overall experience. Among the key environmental factors, lighting and interior color play a crucial role in creating a harmonious atmosphere, affecting mood, relaxation, and functional efficiency. However, Hajj dormitories, which serve as temporary accommodations for pilgrims and visitors, often suffer from suboptimal lighting and color schemes that may not fully support users’ well-being.This study investigates visitor preferences for lighting and color in Hajj dormitory bedrooms and their impact on subjective well-being. Through a systematic analysis and observations, it identifies how lighting conditions and color choices influence psychological responses, either enhancing tranquility or creating discomfort. Findings indicate that poor lighting configurations, such as dim illumination and lack of adjustability, contribute to decreased comfort and usability. Similarly, the selection of overly vibrant or dull color schemes negatively affects emotional balance, reducing the overall quality of the environment.To improve well-being in dormitory spaces, this study emphasizes the need for adaptive lighting solutions that cater to different user activities and color palettes that foster relaxation and positivity. By integrating the Positive Design Framework, dormitories can transition from purely functional accommodations to supportive environments that enhance both physical and psychological comfort. The study provides practical design recommendations that can be applied to Hajj dormitories and other communal accommodations, ensuring that interior spaces contribute to a more comfortable, emotionally supportive, and enriching experience for all users
Analisis Pemodelan Embodied Energy Pada Struktur dan Non-Struktur Gedung Kejaksaan Tinggi Kalimantan Tengah
No full textKegiatan konstruksi memiliki dampak signifikan terhadap lingkungan, terutama melalui emisi karbon. Penelitian ini bertujuan untuk menganalisis embodied energy (EE) dalam gedung sebagai langkah awal memahami kontribusi energi dari bahan bangunan yang digunakan. Melalui analisis EE, penelitian ini mengidentifikasi energi yang terkandung dalam material konstruksi dan bagaimana pemilihan bahan ramah lingkungan dapat mengurangi emisi karbon. Penelitian ini menggunakan pendekatan kuantitatif untuk mengukur dan menghitung volume material, berat satuan, dan EE berdasarkan data dari model 3D Revit dan Inventory of Carbon and Energy (ICE). Pendekatan ini memungkinkan analisis presisi dan standar, menghasilkan data numerik yang dapat dianalisis secara objektif untuk memahami kontribusi energi bahan bangunan. Hasil penelitian menunjukkan bahwa embodied energy pada bagian struktur bangunan adalah 750.742.975 MJ, mencakup 42,34% dari total EE bangunan, sedangkan bagian non-struktur memiliki EE sebesar 1.022.321.637 MJ atau 57,66% dari total EE bangunan. Hal ini menunjukkan pentingnya pemilihan material untuk mengurangi dampak lingkungan
Spatio-Temporal Kriging for Monthly Precipitation Interpolation in East Kalimantan
Full text linkPrecipitation is one of the factors that can lead to various disasters, such as droughts and floods. Ordinary interpolation methods, such as spatial kriging, cannot accommodate the time element, which is crucial for addressing precipitation-related disasters. Therefore, this study applies a spatio-temporal kriging, which incorporates both spatial and temporal elements. The aim of this study is to develop a spatio-temporal kriging model for precipitation, serving as a basis for interpolating precipitation at unobserved points over various time intervals within the study domain. This model is expected to be an effective tool for disaster mitigation and water conservation strategies. The data used in this study comprises total monthly precipitation recorded at seven precipitation observation posts in East Kalimantan from 2021 to 2023. The findings indicate that the spatio-temporal ordinary kriging model is the most suitable approach, with the best semivariogram model identified as the simple sum-metric. The spatial semivariogram follows an exponential model, while the temporal and joint semivariograms follow Gaussian models. The accuracy of the chosen model yields an RMSE of 2493.687. The interpolation results reveal that West Kutai falls within the medium to high precipitation category, making it the district with the highest flood risk
Analysis of the impact of soil excavation stages on slope stability case study of road and bridge construction projects in bts. Singaraja-Mengwitani at point 7E, Bali
Full text linkThe Singaraja - Pengayaman BTS Road Section is a national road located in the central corridor of Bali Island and includes several critical locations in terms of road geometry. Geometric adjustments are being addressed through the BTS Singaraja - Mengwitani Road and Bridge Construction Project Section 7E, involving excavation work up to 64 meters high at STA. 0+119.87. This study aims to analyze slope stability based on existing conditions, evaluate the impact of excavation method variations on slope stability, and determine effective excavation methods both with and without the influence of water on slope stability using Plaxis 2D program. The research results indicate that the safety factor (SF) value of the existing slope prior to excavation was 1.337, whereas it decreased to 1.034 after the final excavation stage. According to the SNI 8460:2017 standard (SF < 1.5), the slope condition in the final excavation stage is deemed unsafe. Excavations with depth variations of 1 meter, 2 meters, and 3 meters, as well as at slope angles of 45˚, 55˚, and 65˚, showed similar impacts on slope stability. A significant decrease in the safety factor occurred from the 7th excavation bench downward, where the safety factor fell below 1.3. At the end of the excavation process, the deepest sliding surface reached a depth of 20.11 meters. At an elevation of +36.5 meters, where the groundwater level reaches 56.40% of the total slope height, which marks the boundary between soil and rock layers, the safety factor drops to 1.040. Further increases in groundwater levels above +36.5 meters could render the slope unstable and potentially lead to collapse
Editorial
Full text linkThis JIFAM Volume 7 (Special Issue 1) January 2025 publishes papers related to protection of geotechnical assets infrastructure and soil improvement methods to develop the development and sustainable asset management for infrastructures.As regulated in Indonesian Scientific Journal Accreditation, a Scientific Journal can publish the Supplement and Special Edition. The JIFAM Editorial Team express their gratitude to the authors who already submitted their papers for the seventh volume (special issue 1)
Comparison Between Soil Improvement Design Method of Replacement and PVD Installation for Soft Soil Embankment, Case Study: Probolinggo – Banyuwangi Toll Road Project Section 3 Sta 23+075 – 23+670
Full text linkThe Probolinggo – Banyuwangi Toll Road, part of Trans Java Toll Road, is one of the strategic projects which connects the west to the east of the island of Java. On this toll road, precisely in section 3 STA 23+075 – 23+670, the toll road structure and pavement construction stands on soft ground with varying depths, with the deepest point being around 9 meters. It is concerned that the presence of soft soil which is quite deep will cause damage to the pavement, which will cause discomfort for road users if the soft soil cannot be improved properly. In this study, several alternatives are designed which will later be used as considerations for the project owner to determine the most effective method for improving soft soil at that location. The method used is subgrade replacement which will later be compared with the use of PVD along with estimated costs for each method. Apart from that, an analysis was also carried out regarding compliance with the rate of residual settlement regulations from the Director General of Highways, namely less than 2 cm per year and less than 10 cm per 10 years. From the study results, it was found that the rate of settlement of all variations of soft soil and replacement had met the Bina Marga regulations. In addition, a comparison of PVD cost requirements with replacement showed that PVD requires lower costs than replacement with a maximum time of ±5 weeks so that it can be concluded as the best alternative method
Implementation Of Fuzzy Logic in The Dissolved Oxygen and pH Control System to Reduce the Risk of Death of Cyprinus Carpio Fish
Full text linkCultivation of Cyprinus carpio, commonly known as the goldfish, in aquariums requires strict monitoring of water quality to maintain the fish's health and ensure its survival. Key parameters such as dissolved oxygen and pH greatly affect the aquatic environment, where imbalances can lead to stress or death. This study aims to design and implement a dissolved oxygen and pH control system using fuzzy logic as an alternative to traditional PID-based or rule-based systems commonly used in aquaculture. The proposed system automatically detects water conditions (LOW, NORMAL, HIGH) and activates appropriate control responses. It integrates an SEN0237 dissolved oxygen sensor, an E-201C pH sensor, aerators, dosing pumps, and an Arduino-based microcontroller. Sensor data is processed via fuzzy inference to operate actuators—either to increase oxygen levels or inject buffer solutions for pH normalization. Unlike previous studies that focus on single-parameter control or fixed-response systems, this system offers a dual-parameter adaptive control approach. Experimental validation shows that the system maintains pH at 6–7 and DO at 3–4 mg/L, with sensor accuracy exceeding 95%. Over 10 days, fish survival improved in the controlled aquarium (7/10) compared to the uncontrolled aquarium (5/10). The system demonstrates potential to reduce water quality fluctuations, offering hope for a more stable aquaculture environment. This work contributes to the application of fuzzy logic in small-scale innovative aquaculture systems, highlighting its potential advantages over conventional methods
Effect of Flow Rate NaOH on CO₂ Absorption Efficiency Using a Column Tray Absorber
Full text linkCO₂ in industrial gas streams reduces process efficiency, corrodes equipment, and affects product quality. Additionally, CO₂ emissions contribute to climate change and global warming. To mitigate these effects, CO₂ removal through absorption is essential. Absorption involves contacting a gas mixture with a liquid absorbent to dissolve the gas component. This study examines the effect of CO₂ flow rate (V) and NaOH flow rate (L) on CO₂ absorption efficiency. The experiment involved preparing 33 liters of 0.1N NaOH and 250 ml of 0.1N HCl, followed by solution standardization using methyl orange. CO₂ was introduced through valve V-4 while NaOH was pumped into the absorption column. Samples were taken after steady state was reached, and titration with 0.1N HCl determined residual NaOH concentration. Flow rate variations of 1, 3, 5, 7, and 9 L/min were tested. Results align with literature, indicating that as CO₂ flow rate increases, NaOH flow rate also rises. However, the L/V ratio and absorbed CO₂ amount decrease due to reduced contact time, lowering absorption efficiency. This study highlights the importance of optimizing flow rates to enhance CO₂ capture
EXPLORING KEY FACTORS INFLUENCING THE PLACEMENT OF OPEN SPACES IN RESIDENTIAL COMPLEXES TO ENHANCE QUALITY OF LIFE
Full text linkOpen spaces in residential complexes function as critical social infrastructure, yet evidence-based frameworks for their strategic placement remain underdeveloped. This study identifies and prioritizes twelve key factors influencing open space location decisions in high-density residential contexts using the Fuzzy Delphi Method. Grounded in Place Attachment Theory, Attention Restoration Theory, and WHO Quality of Life frameworks, a multidisciplinary expert panel evaluated the factors through linguistic scales converted to triangular fuzzy numbers. Defuzzification procedures (acceptance criteria: A ≥ 0.5, d < 0.2) revealed a clear hierarchical structure. Social Interactions emerged as the primary driver (A = 0.733), validating open spaces as social infrastructure rather than merely physical amenities. Visual Quality (A = 0.703) and Long-term Sustainability (A = 0.690) ranked second and third, emphasizing aesthetic engagement and ethical imperatives. Supporting factors, including Privacy, Activities, Security, Spatial Continuity, Accessibility, Environmental Comfort, Multi-functionality, Cultural Context, and Permeability, demonstrated moderate importance as enabling conditions. The findings provide empirically validated design frameworks, challenging conventional planning paradigms that prioritize technical standards over human-centered outcomes