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Design of a 5 GT Pilot Boat with a 700 HP Outboard Engine for Optimal Efficiency and Performance Suitable for Indonesian Waters
Full text linkThe development of maritime technology drives innovation in ship design, including a 5 GT pilot boat designed for high efficiency and performance in Indonesian waters. This vessel is constructed using Fiberglass-Reinforced Plastic (FRP), a material known for its strength and cost-effectiveness compared to wood. Measuring 12.4 meters in length, the boat is powered by a total of 700 HP from two Yamaha F350UCB V8 5.3L F350 outboard engines, enabling it to reach an optimal speed of approximately 25 knots. Stability and power analysis, conducted using the Maxsurf application, indicate that positioning the engines at the stern on both the right and left sides provides the best stability with an inclination angle of 73.6°. This design is expected to enhance operational efficiency and support pilotage activities in dynamic waters
Implementation of Waypoint Navigation and Computer Vision for Monitoring Markers on a Quadcopter Based on ROS (Robot Operating System)
Full text linkIndonesia shares borders with Papua New Guinea, Malaysia, and Timor Leste, where border markers often face displacement or disputes due to challenging and inaccessible terrain. This research develops a waypoint navigation system on a quadcopter, integrating computer vision to enhance the detection and monitoring of border markers. The system leverages the Robot Operating System (ROS) as middleware for seamless integration and control, while a camera detects ArUco markers placed on boundary markers. Image processing, implemented using OpenCV integrated with ROS, facilitates efficient data conversion. The quadcopter autonomously navigates to target coordinates based on marker detection, with an average percentage error of 3.3% for the X-axis and 2.5% for the Y-axis. Tests showed the system could detect a 40x40 cm marker from a height of 5 meters up to a distance of 14 meters, with an average position error of 3.75%. The communication range was effective up to 150 meters before timing out. Despite the computational limitations of the Raspberry Pi hardware, the system demonstrated efficiency, scalability, and ease of deployment. Future research will focus on hardware enhancements, the exploration of advanced image processing methodologies, improved camera resolutions, and the extension of communication networks to support deployment in national boundary monitoring operations
Artificial Intelligence in Integrated Marine Observing Systems: A Comprehensive Review
Full text linkThe marine ecosystem is vital for sustaining life on Earth, yet its vastness and complexity present significant challenges for effective monitoring and management. Integrated Marine Observing Systems (IMOS) have emerged as essential tools for understanding and protecting marine environments. This study aims to systematically review the integration of artificial intelligence (AI) into IMOS, focusing on its contributions to data processing, biodiversity monitoring, and environmental change analysis. A systematic literature review (SLR) method is employed to analyze existing research and identify key AI techniques and their applications in marine and oceanographic studies. Results indicate that deep learning is the most widely used AI method, with marine research being the primary application domain. Other areas, such as environmental monitoring and industrial systems, also demonstrate considerable potential. However, data inconsistency, operational limitations, and the lack of standardized frameworks remain significant barriers. This review highlights the transformative role of AI in enhancing IMOS capabilities and provides recommendations for addressing existing challenges to support sustainable marine management
Forecasting Indonesia's Non-Oil and Gas Exports Using Facebook Prophet: A Seasonal and Trend Analysis
Full text linkThis study aims to analyze and predict the trend of Indonesia's non-oil and gas exports using the Facebook Prophet model, focusing on identifying seasonal patterns, trends, and volatility present in the export data. Monthly export data from 2015 to 2025, sourced from the Statistics Indonesia (BPS), were used as the basis for analysis. The dataset revealed notable seasonal patterns and substantial volatility, particularly in the period following 2020. To model these dynamics, three Prophet model configurations were tested: one considering only annual seasonality, combining both annual and monthly seasonality, and another incorporating only monthly seasonality. The evaluation of these models showed with an initial Mean Absolute Percentage Error (MAPE) of 8.70%. This model was then optimized through hyperparameter tuning. The optimal parameter configuration (changepoint_prior_scale = 0.5, seasonality_prior_scale = 0.01, fourier_order = 3) resulted in a significant improvement, reducing the MAPE to 4.73%. This optimized model demonstrated its capacity to more precisely capture the complex patterns. Furthermore, the study projected Indonesia’s non-oil and gas exports for the period from April 2025 to December 2026. The projections indicate a relatively stable export trend within the range of 20,000 to 22,000 million USD per month, with consistent seasonal patterns
OPTIMIZATION OF STORE LAYOUTS AND INTERIOR DISPLAY DESIGNS IN INDONESIAN BATIK RETAIL ARCHITECTURE ATMOSPHERE
Full text linkThe fashion industry has become one of the most influential sectors in Indonesia's economic growth. Batik, as part of the fashion industry, has a sales concept with a retail store system because it is considered to require specific perception stimuli and shopping experiences. In the direct marketing process, one of the most important aspects to consider is atmospheric architecture or environmental atmosphere architecture. Atmospheric architecture involves designing an environment to evoke specific emotional responses in potential buyers, thereby increasing the likelihood of successful product purchases. With the existence of this concept, the atmospheric architecture elements of the environment as decision-making supporters must be studied and optimized. A finding is needed regarding the store atmosphere elements that influence the creation of an optimal shopping ambiance and experience in the batik retail environment. The method used is a qualitative method involving in-depth interviews and photo elicitation. Data processing was carried out using Computer-Assisted Qualitative Data Analysis Software to classify the research findings and was followed by homogeneous validation of the results with the respondents. This finding shows how store layouts and display designs affect sales. It also suggests ways to use these ideas in batik stores to increase product purchases
The Effect of Patterns of Space Circulation on the Understanding and Satisfaction of Visitors to the Museum of Makassar
Full text linkThe Museum of Makassar, in its capacity as a representative space of urban history and culture, plays a pivotal role is fostering collective public awareness of city’s heritage. However, the undirected circulation structure of the exhibition space engenders a fragmented and unsystematic visitor experience. The objective of this research is to examine visitor circulation patterns in Museum of Makassar and formulate a spatial movement model that is able to integrate curatorial narratives more effectively. This research utilizes a qualitative approach, employing direct observation, spatial mapping and spatial configuration analysis to evaluate the relationship between the movement of visitors and their comprehension of exhibition content. The findings of this research are anticipated to contribute of the development of spatial planning strategies for museums that are more communicative, directed and inclusive, thereby supporting museum in their role as inclusive and immersive public learning spaces
Population Shift of The Family Scaridae: An Ecological Study in The Threatened Habitat of Tikus Island
Full text linkParrotfish have an essential role in maintaining the balance and health of coastal and marine ecosystems, but the existence of coral reefs on Pulau Tikus as their habitat has been degraded, threatening the survival of these fish. This study aims to determine the abundance of fish in the Scaridae family based on coral reef cover and the relationship with coral reef cover. Sampling was conducted in February-May 2021 in the waters of Pulau Tikus Bengkulu. Reef fish observations used UVC (Underwater Visual Census), while coral reef cover used the LIT (Line Intercept Transect) method. The highest reef fish abundance was at station 1 at 0.06 ind/m2, while the lowest was at station 3 at 0.02 ind/m2. The highest percentage of coral cover was at station 1 at 70.44% and the weakest at station 3 at 8.18%. The relationship between the percentage of coral cover and parrotfish abundance strongly correlates with a value of R = 0.62.
The Feasibility Study of Rectangular Floating Solar Panel Motion in Semangka Bay Waters
Full text linkWith the depletion of mineral resources in Indonesia, the need for effective renewable energy alternatives has become critical. Solar energy, harnessed through photovoltaic panels, presents significant potential. However, the widespread adoption of solar panels remains limited due to their large land area requirements and susceptibility to damage. Floating solar panels, installed on water surfaces, offer a promising solution by enhancing energy efficiency through natural cooling while addressing land constraints. This study aims to analyze the motion dynamics of floating solar panels in Semangka Bay and identify the most effective design for open water conditions. Three models were tested: rectangular, kite-shaped, and perforated, using 3D simulation software. The analysis focused on the Response Amplitude Operator (RAO) under regular wave conditions at a 180° angle. The results revealed that Model 3, with 8 mooring points, exhibited the best performance in mitigating rolling, pitching, and heaving motions. The maximum rolling value reached 826.24 cm at 81 seconds, with a minimum of -735.36 cm at 86.7 seconds. Pitching peaked at 390.30 cm at 61.4 seconds and fell to -376.42 cm at 63.9 seconds. Heaving values ranged from a maximum of 17.64 cm at 62.8 seconds to a minimum of -220.94 cm at 83 seconds. This study concludes that Model 3 with 8 moorings offers superior stability, making it the optimal design for floating solar panels in open waters like Semangka Bay. By addressing environmental and implementation challenges, this research contributes significantly to advancing floating solar energy technology in Indonesia. The findings highlight the potential of efficient and resilient designs to harness Indonesia’s abundant solar energy resources effectively
Dari Limbah menjadi Karya: Pemanfaatan Limbah Industri Interior untuk Produk Furniture
Full text linkLimbah industri interior, terutama dari sektor kayu dan tekstil, sering kali menjadi masalah lingkungan yang serius, karena pengelolaannya yang tidak tepat, seperti dibakar, yang menyebabkan polusi udara. Di Kota Malang, industri-industri ini menghasilkan limbah dalam jumlah besar, yang seharusnya bisa dimanfaatkan lebih baik. Pemanfaatan limbah melalui konsep upcycling menawarkan solusi inovatif untuk mengurangi dampak negatif lingkungan sekaligus memberikan nilai ekonomi lebih tinggi. Penelitian ini bertujuan untuk mengeksplorasi potensi upcycling limbah industri interior menjadi produk furniture yang bernilai tinggi dan ramah lingkungan. Fokus utama penelitian ini adalah menciptakan produk bedside table dari limbah kayu yang dilengkapi dengan teknologi smart lighting, serta memberikan pelatihan kepada masyarakat Desa Tirtomoyo untuk memberdayakan mereka dalam pengolahan limbah. Metode yang digunakan dalam penelitian ini adalah kualitatif dengan pendekatan design thinking, yang terdiri dari lima tahapan: empathize, define, ideate, prototype, dan test. Data dikumpulkan melalui observasi lapangan dan wawancara dengan pelaku industri. Proses desain dilakukan secara iteratif hingga menghasilkan produk yang optimal. Hasil penelitian menunjukkan bahwa limbah industri interior dapat diolah menjadi produk furniture yang menarik secara estetika dan fungsional, seperti bedside table. Produk ini tidak hanya ramah lingkungan, tetapi juga memiliki nilai jual tinggi di pasaran. Selain itu, pelatihan dan pendampingan kepada masyarakat berhasil meningkatkan pemahaman mereka tentang pengolahan limbah dan membuka peluang usaha baru, yang berdampak pada pengurangan pengangguran di wilayah tersebut. Penelitian ini menyimpulkan bahwa pendekatan upcycling dalam pengelolaan limbah industri interior tidak hanya membantu mengatasi masalah lingkungan, tetapi juga menciptakan peluang ekonomi yang signifikan bagi masyarakat setempat
KONVERSI LIMBAH MINYAK GORENG MENJADI BIODIESEL
Full text linkLimbah minyak goreng dari penggorengan ayam geprek telah berhasil di konversi menjadi biodiesel. Konversi biodiesel dilakukan dengan menggunakan katalis NaOH dengan metode refluk pada suhu 65°C selama 60 menit dengan perbandingan mol asam oleat : methanol 1:2 dan variasi jumlah massa katalis 0,5%, 1%, 1,5%, 2%. Hasil pengujian viskositas, densitas, nilai kalori, titik nyala serta angka setana yang diperoleh sudah sesuai dengan SNI 7128 – 2015. Dari hasil penelitian ini, didapatkan jumlah variasi massa katalis 0,5% menunjukkan nilai analisa yang paling optimum dari jumlah variasi katalis yang lain. Dengan diperoleh hasil pengujian titik nyala sebesar 157, Densitas 40°C 0,866 g/cm3, Nilai Kalori 9.601 kal/gr, Angka Setana >75, dan Viskositas 5,4 cSt. Kata Kunci: Minyak Goreng Bekas, Limbah Minyak Goreng, Biodiesel, Katalis NaO