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High-rise buildings such as the World Trade Center Jakarta generally have high inductive electrical loads, so that their reactive power consumption is large and the power factor decreases below the SPLN standard (≤0.85), resulting in increased power losses and operational costs. This study aims to measure the power factor value before and after repairing the detuned reactor and capacitor on the capacitor bank panel, compare the results of field measurements with ETAP simulations, and assess the feasibility of the installed capacitor bank and determine the difference in the results of the ETAP simulation between measurements and load calculations on the World Trade Center building. The methods used include literature review, field observations on the LVMDP panel, MCC and capacitor bank, discussions with supervisors, data collection of current, voltage, kW, kVAR, kVA and cos φ using Lovato DCRG8 and ampere clamp, and load simulation using ETAP software. The results show that the cosφ value increased from 0.70 to 0.95 (an increase of 35.71%), the compensated reactive power reached 204 kVAR (Lovato), 282.6 kVAR (tang ampere), and 415 kVAR (ETAP simulation), with a power factor or cosφ = 0.95. In conclusion, the replacement of detuned reactors and capacitors effectively improves the power factor in the WTC Jakarta Building, reduces reactive loads, and the ETAP simulation results are consistent with field measurements, so that the capacitor bank installed in the WTC building is declared effective in reducing reactive currents, thereby reducing kVAR, kVA loads and improving the efficiency of the electrical system distribution for better energy management

Inventory management is a crucial aspect in improving operational efficiency, particularly for micro, small, and medium enterprises (MSMEs) such as grocery stores. This study aims to analyze the effect of implementing the First In First Out (FIFO) method on operational efficiency at Reni Grocery Store. Prior to applying FIFO, the inventory system in the store was poorly organized, often resulting in losses due to expired or damaged goods. Since March 2025, FIFO has been implemented by placing older items at the front of the shelves, while new items are consistently placed at the back, accompanied by routine checks of expiration dates. This research employs a qualitative approach using in-depth interviews with the store owner as the main subject. The findings indicate that FIFO positively influences operational efficiency, as reflected by reduced expired goods, improved stock recording, and more organized product flow. These results are consistent with previous studies, such as Pratama & Sari (2020), which showed FIFO reduced losses by up to 25%, as well as Suharto et al. (2021) and Rahman (2022), who emphasized that FIFO enhances stock accuracy and distribution efficiency. Nevertheless, this study also reveals limitations, including limited storage space and a lack of manpower for routine checks, which prevent FIFO implementation from being fully optimal.

This study aims to analyze the financial risk of PT Smartfren Telecom Tbk during the 2014–2023 period, focusing on both short-term and long-term liquidity aspects. The analysis employs financial ratios as measurement tools to assess the company’s financial stability and its ability to fulfill financial obligations within their respective time frames. The ratios used include the current ratio, quick ratio, interest coverage ratio, and cash flow-to-debt ratio. The results indicate that the company faces significant challenges in maintaining short-term liquidity, as reflected in the consistently low values of the current and quick ratios throughout the observation period. This condition suggests a limited ability of the company to meet its short-term obligations using available assets. In terms of long-term liquidity, although there are efforts to strengthen the capital structure, the company still encounters difficulties in meeting its long-term debt obligations. This is evident from the low interest coverage ratio and cash flow-to-debt ratio. Therefore, improving operational efficiency, implementing more effective cash management, and undertaking financial restructuring are essential measures to strengthen the company’s liquidity position sustainably.

This study aims to analyze the integration of administration, state property management, human resources, and finance in supporting a facilitative immigration system. These four aspects are essential pillars for maintaining efficiency, effectiveness, and transparency in public service delivery within immigration institutions. However, their implementation often operates separately, causing inefficiency and delays in administrative decision-making. Using a descriptive-analytical approach based on literature review and regulatory analysis, this study finds that structured collaboration among administrative units strengthens internal coordination and improves service quality for the public. Administration functions as the foundation for documentation and record management, state property supports operational infrastructure, human resources drive organizational performance, and finance ensures program continuity and budget accountability. The integration of these components creates a more adaptive, transparent, and accountable work system to face global challenges, especially in the era of digital public services. The study recommends implementing an integrated information system, enhancing personnel competencies, and optimizing budget planning and supervision to achieve professional and competitive immigration governance.

Background: Traditional naval maintenance strategies rely on centralized supply chains and pre-manufactured spare parts, leading to long repair downtimes and logistical inefficiencies, particularly for vessels operating in remote maritime regions. Additive manufacturing (3D printing) offers a disruptive alternative by enabling on-demand production of spare parts, reducing dependence on external suppliers, and enhancing fleet self-sufficiency. However, material durability, operational feasibility, and cost-effectiveness remain underexplored for naval applications. Original Value: This research advances the study of AM in naval engineering, assessing its practical viability beyond theoretical potential. Unlike previous studies focusing on commercial maritime applications, this study evaluates 3D printing’s impact on naval fleet readiness, supply chain resilience, and sustainability. Objectives: The study investigates how 3D printing can optimize naval maintenance efficiency, specifically analyzing its feasibility, material performance, cost implications, and logistical advantages. Methodology: A qualitative-empirical approach was used, combining material performance testing, expert interviews, and operational case studies to evaluate mechanical durability, economic feasibility, and AM integration challenges. Results: Findings indicate that AM reduces repair downtime by 40%, lowers part procurement costs by 30–50%, and enhances supply chain resilience. However, material limitations and infrastructure readiness remain key adoption challenges. Conclusions: Hybrid AM adoption—where 3D printing supplements rather than replaces traditional manufacturing—offers the most practical near-term approach for naval fleets. Strategic investment in material research, onboard AM training, and fabrication infrastructure will enhance fleet efficiency, reduce environmental impact, and future-proof maritime maintenance strategies.

PT Pos Logistik Indonesia (POSLOG) is a company that provides integrated logistics services across various sectors. One of the main commodities delivered regularly each year is rice from Bulog, which has a significant distribution volume. At present, PT Pos Logistik Indonesia – Branch Bandung still relies on third-party (vendor) transportation services, which leads to suboptimal company revenue and creates dependency on external parties. This study aims to conduct a comparative analysis of operational cost efficiency between the use of company-owned vehicles and rented vehicles. The analytical methods applied include Vehicle Operating Costs (VOC), Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PP). The analysis results show that the cost of using vendor services amounts to IDR 710 per kilogram, while the cost of using company-owned vehicles is only IDR 284 per kilogram. Furthermore, the NPV value reached IDR 2,732,364,981, the IRR was 129.94%, and the Payback Period was 1 year and 9 months. Based on these findings, investing in company-owned vehicles is proven to be more efficient, economical, and feasible to improve profitability and ensure business sustainability.

The increasing integration and digitization of smart grid systems have exposed them to a variety of security threats, necessitating robust security measures to ensure their reliability and efficiency. This paper proposes a novel Digital Twin-Based Cyber-Physical Security Framework, incorporating AI-driven predictive maintenance and zero-trust architecture to address the evolving challenges of securing smart grids. By leveraging digital twin technology, this framework creates a real-time virtual representation of physical systems, enabling continuous monitoring and simulation for enhanced security and operational performance. Zero-trust security principles are integrated to ensure that no entity, whether inside or outside the network, is trusted by default, thus significantly reducing the risk of cyber-attacks. Additionally, AI-driven predictive maintenance enhances the framework’s reliability by proactively identifying potential failures before they occur, reducing downtime and improving system resilience. Through the development and simulation of this framework, including attack and failure scenarios, the paper demonstrates that the proposed system outperforms traditional methods in terms of anomaly detection, system downtime, and response times. The integration of predictive maintenance allows for early identification of component failures, thus enhancing the overall resilience of the grid. The zero-trust architecture further strengthens the cybersecurity posture, preventing unauthorized access and attacks. The study also identifies challenges, such as data synchronization and scalability, which must be addressed for broader implementation in large-scale smart grid systems. The findings suggest that the proposed framework could play a critical role in the future evolution of smart grid security, offering valuable insights for researchers and practitioners.  

This study aims to analyze the strategic role of Information Technology (IT) in improving operational efficiency within e-commerce companies in Indonesia. A literature review approach was employed by examining various scholarly sources, including accredited national journals and relevant books. The findings indicate that the implementation of IT such as Enterprise Resource Planning (ERP) systems, Big Data Analytics, and Cloud Computing significantly accelerates business processes, reduces operational costs, and enhances data accuracy and service quality. E-commerce companies that integrate IT into their operations are shown to adapt more effectively to market dynamics and consumer preferences. The study concludes that the use of IT is not merely a supporting tool, but a key factor in creating competitive advantage. The implications of this research offer insights for e-commerce industry players and policymakers to continuously promote digital innovation in pursuit of efficiency and business sustainability.

This study aims to analyze the strategic role of the shipping agent, specifically PT. Naval Global Trans Belawan Branch, in ensuring the smooth flow of the maritime logistics chain. The shipping agent functions as a crucial intermediary coordinating contasiner distribution, bridging the interests of cargo owners, shipping companies, and the Belawan Port authority. The research utilizes a descriptive qualitative approach, with data collection performed through field observation and documentary study within the Belawan Port environment. The findings identify that the shipping agent holds broad responsibilities, commencing with container booking according to the required type and size, scheduling vessel arrivals and departures, managing customs and port documentation, and monitoring container movements (from the depot to loading onto the vessel). This role is highly instrumental in determining port throughput efficiency. However, in carrying out its functions, the shipping agent encounters several significant challenges. These constraints include limited container availability, disruptions in the port information system which is not yet optimally integrated, and dynamic changes in export-import regulations. These obstacles potentially cause operational delays and an increase in logistics costs. The study concludes by emphasizing the importance of better information technology integration between the shipping agent and the port authority. Furthermore, enhancing the quality of human resources (HR) through training and certification is key to ensuring that agents can respond to regulatory changes and operational challenges quickly and professionally.

This study focuses on analyzing the efficiency of water usage during ablution in mosques, aiming to identify the factors causing inefficiency and propose solutions aligned with sustainability and Islamic values. Ablution is essential for Muslim prayer, yet modern mosques often neglect water efficiency, leading to waste and high operational costs. A mixed-methods approach was employed, combining observations, water discharge measurements, and surveys from 35 congregants at an urban mosque. The results showed an average ablution water consumption of 2.47 liters per person, with significant variation, primarily due to faucet usage behaviors. The survey also revealed that 45.71% of participants viewed water use as inefficient, with mixed responses regarding the implementation of automatic faucets. These findings underscore that water conservation cannot be achieved solely through technical solutions like sensor faucets or water recycling systems. Instead, it requires integrating Islamic values and education to encourage behavioral change among mosque-goers. By promoting awareness and responsible water use, mosques can become role models in environmental conservation. This study highlights the importance of combining technical engineering solutions with spiritual values, contributing to a more sustainable and efficient use of resources in mosque facilities while adhering to Islamic principles.

The Digital transformation in Indonesia’s fast-food industry has accelerated the adoption of self-ordering technology to improve operational efficiency and customer experience. However, the implementation of such systems faces several technical, operational, and social risks that may hinder success. This study aims to analyze the optimization of risk management in the development of self-ordering applications for Indonesian fast-food restaurants. A qualitative approach through a literature review was employed to identify key risk factors and mitigation strategies based on academic sources published between 2020 and 2024. The findings reveal that a comprehensive and contextual risk management approach is critical for successful implementation. Technical risks can be minimized through staged system testing and robust data security, while operational risks can be mitigated through employee training and effective change management. Moreover, adapting system design to local cultural and consumer preferences enhances user acceptance. The study concludes that applying risk management frameworks such as ISO 31000 and PMBOK can strengthen the digital transformation of Indonesia’s fast-food industry and provide practical guidance for decision-makers in managing technology-based restaurant operations.

Background: Maritime engineering has traditionally relied on reactive and preventive maintenance strategies, often leading to operational inefficiencies, unplanned downtime, and excessive costs. With the rise of smart ship technologies, predictive maintenance (PdM) has emerged as a data-driven solution, leveraging sensor-based monitoring and real-time diagnostics to optimize ship maintenance. However, its integration into maritime education remains underexplored, particularly in training vessels used for vocational learning. Original Value: This research contributes new insights into the feasibility, effectiveness, and educational relevance of predictive maintenance in maritime vocational training. Unlike previous studies that focus on commercial ship applications, this study examines PdM within the context of training vessels at Poltekpel SULUT, bridging the gap between academic training and industry expectations. Objectives: The study seeks to answer: How does predictive maintenance improve the efficiency, cost-effectiveness, and reliability of naval auxiliary systems in training vessels? Methodology: A qualitative approach was employed, integrating sensor-based performance analysis, structured interviews, and questionnaire surveys involving cadets, instructors, and industry professionals. Data were analyzed through thematic categorization, cross-group comparisons, and narrative synthesis. Results: PdM demonstrated high effectiveness in reducing downtime (92/100), optimizing maintenance efficiency (91/100), and aligning with industry practices (89/100). However, challenges in sensor accuracy (85/100) and training integration were identified. Conclusions: The findings highlight the necessity of incorporating predictive maintenance into maritime training curricula to equip future engineers with the skills required for Industry 4.0 maintenance solutions, ensuring better operational efficiency and sustainability in the maritime sector.

This research analyzes the business licensing process for plywood products at PT Anugerah Albasia Abadi Talun, Blitar Regency. It aims to identify the processes undertaken, the obstacles encountered, and to provide recommendations. Employing a descriptive qualitative approach and the Triple Bottom Line framework, data was collected through interviews, observation, and documentation studies. The research findings indicate that the company has successfully fulfilled all complex formal licensing requirements, including the Business Identification Number (NIB), Industrial Business License (IUI), Timber Legality Verification Sistem(SVLK) certificate, Environmental Management and Monitoring Efforts (UKL-UPL), and Forest Product Transportation and Trading License (IPHH), demonstrating a commitment to regulatory compliance. Nevertheless, the licensing process is still hampered by the disharmony between the digital Online Single Submission (OSS) system and manual practices, dynamic regulatory changes that are not yet widely disseminated, limited internal human resource capacity, and a lack of harmonization and coordination among government agencies. The Triple Bottom Line analysis reveals that licensing legality supports economic competitiveness and market access, while social aspects are well-established through local job creation and CSR programs. However, environmental management remains administrative and not yet fully performance-based. Therefore, the research recommendations focus on strengthening internal capacity, optimizing the OSS system, developing proactive environmental management, and enhancing continuous community involvement to achieve higher operational efficiency and sustainability

Bus Rapid Transit (BRT) systems play a crucial role in providing efficient and sustainable urban mobility, yet service quality often faces challenges that lead to passenger dissatisfaction. This study focuses on BRT Trans Jateng Corridor 7, which has received a considerable number of complaints regarding service reliability, comfort, and punctuality. The main objective of this research is to improve passenger satisfaction by applying the Six Sigma methodology to identify, analyze, and reduce the root causes of service-related complaints. Using the DMAIC (Define, Measure, Analyze, Improve, Control) framework, data were collected through complaint reports, passenger surveys, and operational performance indicators. Statistical analysis and cause-effect diagrams were employed to pinpoint critical factors influencing complaints, including bus frequency, driver performance, ticketing efficiency, and infrastructure support. The findings indicate that the application of Six Sigma significantly reduced recurring complaints, particularly in the areas of schedule adherence and service responsiveness, leading to measurable improvements in overall passenger satisfaction. The synthesis of results demonstrates that structured quality management approaches such as Six Sigma can effectively enhance public transportation service quality by providing systematic solutions to operational problems. In conclusion, this research highlights the practical benefits of Six Sigma in improving service performance and reducing passenger complaints, offering valuable insights for policymakers and transportation operators seeking to strengthen the quality and sustainability of public transit systems.

Blood transfusion is a critical medical procedure that requires the blood to be at a temperature close to normal human body temperature, approximately 36– 38°C. Transfusing cold blood can lead to serious complications such as hypothermia, coagulation disorders, and even cardiac arrest. Therefore, a reliable and automated blood warming device is essential to ensure safe transfusions. This study aims to design and modify a Blood Warmer Thawing device based on the Arduino Uno microcontroller as an innovative and cost- effective solution, particularly for healthcare facilities with limited resources. The system integrates a DS18B20 temperature sensor to monitor the temperature of the heating medium in real time, with data displayed on a 20x4 I2C LCD. Users can set the desired temperature via a 4x4 keypad, and the system automatically adjusts the heater performance based on the detected temperature. To enhance safety and operational efficiency, the device is also equipped with a buzzer as a warning indicator when the temperature exceeds the safe threshold, and utilizes a DC motor and cooling fan to maintain proper heat circulation. Test results indicate that the device is capable of maintaining the liquid temperature within the ideal range for blood transfusions, with high stability and fast response to temperature changes. This innovation offers a practical, affordable, and easy-to-implement solution to support effective and safe blood transfusion procedures in various healthcare settings.

The development of information technology has accelerated digitization in various sectors, including in the decision-making process. In the DayTrans Shuttle service, the selection of the best route is still done manually using Microsoft Excel. This process is time-consuming, inefficient, and has the potential to cause errors and subjectivity. The purpose of this study is to design and develop a web-based decision support system by applying the Weighted Product (WP) method to determine the most optimal shuttle route objectively and efficiently. The research data was obtained through interviews, observations, and literature studies, then analyzed according to system requirements. The development was carried out through the stages of requirements analysis, database and interface design, implementation, and testing. The developed system is equipped with features for managing criteria data, alternative routes, weight calculations, and real-time presentation of recommendation results. The research results show that the system functions well, is able to speed up the route selection process, and produces accurate and transparent recommendations. Thus, this system is expected to improve DayTrans' operational efficiency while supporting the quality of inter-city transportation services.

Modern industries require automation to enhance operational efficiency and productivity. This study designs and implements an automatic sorting system based on the Internet of Things (IoT) using a mini conveyor, ESP32 microcontroller, TCS3200 color sensor, servo motor, and the Blynk application. The system is designed to accurately detect object colors, sort objects based on color, and enable remote monitoring and control via mobile devices. Testing results indicate that the system can detect and sort objects with a high level of accuracy, although some errors occur due to changes in lighting conditions. The conveyor speed is consistently recorded at 0.335 m/s, while the system's response time, including color detection, servo movement, and application updates, operates within an optimal range. The Blynk application enhances the flexibility of real-time system control. This study demonstrates that IoT-based sorting systems can serve as an efficient solution to support industrial automation. Further development is recommended to improve color detection accuracy and expand the system's application in more complex industrial scenarios.

This study focuses on analyzing the Exit Permit Only (EPO) Crewing Services organized by PT. Samudra Shipping Agency in cooperation with the Dumai Immigration Office. The EPO service plays a crucial role in ensuring legal compliance regarding the movement of foreign seafarers who are executing a sign-off (leaving the vessel) within Indonesian territory. The main objectives of this research are to examine the operational procedures, analyze the role of the shipping agency, and evaluate the effectiveness of the synergy between the agency and the immigration authorities in processing immigration documents. The research methodology employed is a combination of field research (field research), which involves observation and the collection of practical data, and literature review (library research) to strengthen the regulatory and theoretical foundation. The findings indicate that the success of the EPO service is highly dependent on the effective synergy between PT. Samudra Shipping Agency and the Dumai Immigration Office. The shipping agency holds a vital role in handling the entire crew sign-off process and is fully responsible for managing the temporary stay permits for foreign crew members through the issuance of a Dahsuskim (Special Immigration Document). The improvement in the quality of this EPO service not only provides operational benefits for the agency and the crew involved but also substantially supports the government's efforts to supervise the movement and presence of foreign workers in an orderly and legal manner. Optimizing this procedure will enhance efficiency and regulatory compliance in the port area.

This study aims to explain the procedure for processing the Notice of Readiness (NOR) document for coal-carrying vessels at PT. Armada Lintas Baruna Bandar Lampung and to identify the consequences that occur when the NOR is submitted late or contains inaccuracies. As vessels from international shipping companies frequently call at Indonesian ports to transport coal abroad, companies must continuously improve service efficiency and reliability to support national shipping and trade performance. PT. Armada Lintas Baruna plays a key role in managing export vessels, particularly coal carriers, from loading ports to their country destinations, and the NOR serves as a crucial document through which the Ship Master declares that the vessel is fully prepared to load or discharge cargo during the charter period. The NOR service process includes several stages: verification of vessel readiness by the agent, preparation and submission of the NOR document, verification by the port authority, issuance of NOR confirmation, and document closing. Delays or errors in NOR submission can disrupt the vessel’s operational schedule, potentially causing financial losses for shipowners through demurrage charges. This paper employs both field research and library research to provide an in-depth understanding of the NOR service mechanism.

This research aims to analyze the impact of implementing the International Safety Management (ISM) Code internal audit on the operational smoothness of the vessel MV. Martha Golden, managed by PT. Multi Jaya Samudera Belawan. The implementation of the ISM Code is a mandatory requirement regulated by Law No. 17 of 2008 concerning Shipping, designed to ensure safe ship operation and the prevention of marine pollution. The research methodology employed is field research (field research) through observation and the collection of direct operational data, complemented by a literature review (library research) to examine related regulations and theory. The findings demonstrate that the consistent execution of the ISM Code internal audit has a significant positive influence on improving the vessel's safety and operational integrity. This audit, carried out by the Designated Person Ashore (DPA), encompasses scheduling, conducting thorough inspections onboard, and reporting findings. Consistent auditing minimizes the risk of accidents at sea, enhances the compliance of all crew members with the applicable Safety Management Sistem (SMS), and ensures that the vessel operates safely and efficiently according to international standards. The study concludes that discipline in performing internal audits and the crew's adherence to SMS procedures are the primary keys to maintaining operational integrity. It is recommended that the company increase the frequency and quality of internal audits and crew training to ensure the vessel's safety and operational efficiency are consistently maintained.