Owing to the advanced and large-scale of current industries, incidents of major and critical social disasters such as fires, explosions, and chemical accidents have become more frequent at industrial sites and multiple integrated facilities. In the event of a fire or explosion, firefighters arrive at the site as soon as possible and begin fire extinguishing activities. The most important factors for extinguishing a fire are speed and accuracy. The success or failure of initial fire suppression is determined by the rapid and smooth deployment and supply of fire hoses to the fire site for fire suppression. This study investigated various loading methods of fire hoses used for fire extinguishing. Consequently, a device capable of automatically loading an accordion-type fire hose that automatically loads the fire hose used for fire extinguishing in zigzag patterns was developed. Using this device, firefighters dispatched to the scene can quickly and accurately deploy fire hoses to extinguish the fire, and simply and conveniently load fire hoses. Consequently, the device is expected to help reduce safety accidents and fatigue of firefighters at the scene.

This study aims to analyze the tasks that domestic airlines need to prepare for to improve service quality and customer satisfaction amid the increasing domestic and international aviation demand following COVID-19, and to propose ways to enhance competitiveness through improved customer satisfaction. A survey was conducted among 131 domestic flight users at Gimhae International Airport, and the outcome was analyzed. The results showed that customer satisfaction with airline services positively impacts the likelihood of customers to return to the airline. It was particularly noted that airport services and in-flight services, where customers and crew members interact, significantly contribute to customer satisfaction. Additionally, customers who experienced satisfaction with the service were found to continuously repurchase tickets. As a result of checking the airline’s strengths by elements, boarding procedures, airport staff, airport services, baggage handling, safe operations, cabin cleanliness, and cabin safety were found to be strengths. Conversely, important but less satisfactory facts were identified as ticketing procedures, airfares, adherence to flight schedules, and comfortable and cozy cabin seats. Therefore, if an airline improves service quality by referring to important factors in customer satisfaction and satisfaction factors recognized by existing customers, it is likely to gain a competitive advantage in the airline industry.

This study aims to evaluate the risks associated with chemical substances used in the battery manufacturing industry through the application of the Chemical Hazard Risk Management (CHARM) automated program. Given the extensive use of chemicals in modern industries, ensuring the health and safety of workers has become a critical responsibility for employers. The CHARM system enables a comprehensive evaluation of chemical hazards by combining toxicity data, exposure levels, and workplace conditions to generate risk scores. The study assessed various processes within the battery manufacturing industry, including electrode winding, electrode manufacturing, powder input, and slurry coating. Among these, the powder input and electrode manufacturing processes were identified as high-risk due to frequent exposure to hazardous chemicals like organic solvents and heavy metals. As a result, improvement measures such as the automation of manual processes, enhanced ventilation systems, and the use of less toxic alternatives were proposed to mitigate the risks. This research highlights the importance of continuous risk assessment and the implementation of proactive safety measures in the battery manufacturing industry to ensure worker safety and prevent chemical accidents.

Life logging and bio-signal characteristics are typically time-series data collected over time, and extracting meaningful data features from accumulated data is clinically significant. This paper aims to review the principles and advancements of artificial intelligence and analytical techniques related to life logging and bio-signals, and propose future research directions for fall prevention and risk factor prediction in the elderly. A literature search was conducted through Web of Science, Google Scholar, PubMed, and Scopus. Search terms included "feature extraction," "electromyography," and "machine learning," covering studies published between 2020 and 2023. A total of 67 papers met the inclusion criteria: 18 papers from 2023, 18 from 2022, 18 from 2021, and 13 from 2020. Feature extraction methods related to fall prediction in the elderly based on life logging and bio-signals were categorized into (1) statistical and physical features, (2) linear features, and (3) neural network-based features. Data characteristics can be broadly classified into statistical and physical features, linear features, and neural network-based features. Recently, the advancement of wearable sensors has increased the need for large-scale time-series data analysis and clinical research, suggesting that future studies should integrate various clinical indicators, particularly health status, to analyze clinical data comprehensively.

Internet Small Computer System Interface (iSCSI) is a modern protocol designed to implement Storage Area Network (SAN) technology over TCP/IP, enabling access to data stored on Direct Attached Storage (DAS) through an IP network. It offers economic efficiency, ease of management, and the ability to leverage existing network infrastructures. Despite concerns about performance and reliability, iSCSI-SAN has shown significant potential as a viable alternative to traditional DAS in local systems. This paper investigates the use of SAN storage technology and the iSCSI-SAN protocol to enhance access to attached storage disks in local systems. The study emphasizes the advantages of utilizing iSCSI-SAN as virtual storage over DAS, particularly for personal computers and local environments. Experimental findings reveal that iSCSI-SAN outperforms DAS in terms of throughput, measured in I/Os and MB/s, and average response time across various block sizes. Additionally, Software Defined Storage Solution (SCVM) application demonstrates how DAS can be converted into SAN storage, enabling seamless integration with virtual machines via the iSCSI-SAN protocol. This capability highlights the feasibility of using iSCSI-SAN technology for large-scale data storage systems, combining the cost-effectiveness of DAS with the advanced features of SAN. The analysis concludes that iSCSI-SAN technology offers a practical and scalable solution for modern storage requirements, making it an attractive option for both small-scale and enterprise-level applications.

This study focuses on the conceptual design and prototype production of an unmanned miniaturized tank equipped with a Remote Controlled Weapon Station (RCWS). Korea's defense industry is facing challenges due to decreased military service obligations caused by low birth rates, which in turn directly impact defense capabilities. To address these challenges, maximizing combat efficiency has become essential. This research aimed to enhance the miniaturization and lightweight properties of unmanned small tanks to mitigate the drawbacks of conventional tanks. By designing a lightweight Model A based on the KR-16 rifle and a Model B tank, and combining these models, the final tank design was completed. Structural and flow analyses were performed to verify structural safety and driving performance, and a 1:0. 4 scale model was produced using a 3D printer. The prototype was validated through remote control tests using Arduino Uno, assessing air resistance and structural stability during operation. This study demonstrates the potential of unmanned miniaturized tanks in adapting to evolving technological trends and maintaining military power within the defense industry.

A new control scheme for maximizing the load capacity of active homopolar magnetic bearings is developed. The typical control scheme of homopolar magnetic bearings is well known. However, the control scheme does not utilize the maximum vertical load since the horizontal pole pairs does not provide any load capacity. In this new control scheme uniform amount of currents are supplied to the 4 pole pairs of the homopolar magnetic bearings so that the maximum restoring magnetic forces can be generated in the opposite direction to the displacement vector. The optimal current distributions are defined as a continuous function to maintain uniform force vectors relative to the rotor orbits. The load capacity of the bearing is then increased by more than 30% compared to the conventional horse shoe configuration. The optimal current distribution matrix for the maximum load capacity and the displacement vector can be included in the controller.

The purpose of this study is to communicate smoothly with nursing staff in nursing homes through information provision by applying and evaluating an app program. This study is a nonequivalent control group pretest-posttest design that measures the level of anxiety, depression, and the primary caregiver stress of the family members before and after the use of the smartphone app program. The primary caregiver stress of family members who used the app was significantly lowered. In terms of the level of anxiety, depression, and primary caregiver stress between the experimental group according to the use of the app and the control group who conducted general counseling were not different. To reduce anxiety, depression, and the primary caregiver stress of family members who have patients in nursing homes, providing patient information non-face-to-face can also reduce the stress of family members. In addition, it is believed that providing patient information using a smartphone app can replace face-to-face methods when it is difficult to visit patients, such as vulnerability to infection or when family members live far away.