This study developed an unmanned autonomous moving algae collection device (HAMA-bot) to remove high-density algae concentrated in the waterfront of urban agricultural reservoirs, and analyzed the effect of algae removal after field application to medium-sized urban reservoir. The algae reduction effect (Chl-a) of the study site in the reservoir by the HAMA-bot operation showed an average 18.5% higher in the treatment area compared to the control area before operation, while the average reduction of 24% in the treatment area after operation. In addition, the Chl-a removal rate, which directly analyzed the influent and effluent of HAMA-bot, showed a very high level with an average of 96.9% (94.7~99.2%). Currently, it is optimized for urban reservoirs and manufactured on a small scale, but it is a useful tool that can be applied on a large scale to large dams and rivers, and it is considered that the field applicability would be improved with the optimized scale.

Purpose: This study aimed to explore user experience with UV-C disinfection devices in clinical settings to obtain critical information for the development of domestic devices to meet the increasing demand for efficient environmental disinfection in healthcare settings, particularly in terms of effective multidrug-resistant organism control. Methods: A qualitative approach was employed involving 21 participants (infection control nurses, staff nurses, and device managers). Data were collected through five sessions of focus group interviews, and conventional content analysis was undertaken. Results: Four categories and 13 subcategories were identified: (i) Introduction and usage status of UV-C disinfection devices, with ‘Surge in demand for rapid response to infectious diseases’ and ‘Diversified application and management of UV-C disinfection devices based on needs’ subcategories; (ii) Advantages of using UV-C disinfection devices, with ‘Significantly reduced disinfection time,’ ‘Easy and simple operation,’ and ‘Providing a sense of reassurance from a visible confirmation of disinfection’ subcategories; (iii) Limitations of current UV-C disinfection devices, including ‘Ambiguous disinfection range and presence of disinfection blind spots,’ ‘Lack of standards for disinfection efficacy verification and management,’ ‘Safety concerns regarding ultraviolet radiation exposure,’ and ‘Issues related to maintenance of UV-C disinfection devices’ subcategories; and (iv) Expectations for domestic UV-C disinfection devices, including ‘Minimization of disinfection blind spots,’ ‘Variety in device sizes,’ ‘Auxiliary devices for enhancing usage efficiency,’ and ‘Clear protocols for device usage and maintenance. Subcategories.’ Conclusion: UV-C disinfection devices offer valuable benefits for infection control; however, improvements are needed to enhance their efficacy and usability. Practical recommendations include developing standardized safety protocols, enhancing UV-C coverage, and improving device mobility and maintenance to meet diverse healthcare needs. Such advancements in UV-C technology can significantly support effective infection control and operational efficiency in healthcare settings.

본 논문에서는 건설 현장 관리의 과제를 다루고 IoT 기술 활용을 위한 기술 적용에 대해 정리하였다. 도로 포장 장비의 유휴 시간을 모니터링하는 IoT 장치를 설계 및 구현하여 효율적인 장비 관리 시스템을 개발하는 것을 목표한다. 또한, 본 연구에서는 통신방식 선 정, 사용자 친화적인 플랫폼 설계, 데이터 수집 및 분석을 위한 진동센서 기반 IoT 디바이스 개발을 통한 실시간 관리에 중점을 두고 있다. 플랫폼을 통해 공사현황을 실시간으로 모니터링하고 장비 유휴시간을 관리해 효율성을 높일 수 있으며, IoT 디바이스는 90% 이 상의 데이터 정확도를 보장한다. 현장 테스트를 통해 장비 사용 추적 효과가 확인되어 보다 효율적인 건설 관리에 기여하고자 한다.

고대 그리스 코러스는 고전적인 이야기 전달 도구로 간주되어져 왔다. 그런데 예이츠의 󰡔데어드라󰡕는 고전적인 코로스와는 다른 방식으로 악사들을 이용하여 이야기를 전달한다. 악사들을 통하여 이야기를 전달하는 예이츠의 방식은 여러 가지 점에서 클래식한 방식에 익숙해진 관객을 낯설게 만든다. 이와 같은 점 외에도 󰡔데어드라󰡕의 이야기 전달 방식은 관객으로 하여금 캐릭터에 대한 선입견을 갖게 하고 드라마의 연기 동작에도 영향을 미친다.

In response to the global interest and efforts towards reducing plastic use and promoting resource recycling, there is a growing need to establish methods for recycling discarded fishing gear. In Korea, various technologies are being developed to recycle discarded fishing gear, but significant technical and policy challenges still remain. In particular, biodegradable gill nets require a pre-treatment process to separate biodegradable materials from other substances and to remove salt before recycling. Therefore, this study aims to develop a pre-treatment device for recycling biodegradable gill nets and to evaluate the feasibility of recycling them.

Numerous research institutes have been studying semiconductor devices using two-dimensional materials for several years. However, the findings of these studies have yet to demonstrate the performance of digital devices that could replace silicon devices in the semiconductor industry. Nonetheless, the high carrier mobility and saturation velocity of 2-D materials remain attractive for semiconductor device performance, particularly in analog devices where these features can be utilized. In this research, we fabricated a phase-shift controller, a typical component of analog circuits, using 2-D materials and verified its operational characteristics. Analog circuits do not require large area integration, so we employed graphene, which has relatively simple formation and processing, as the 2-D material. Devices using graphene as a channel exhibit a V-shaped I–V characteristic, allowing for the input voltage to be adjusted to produce various modes of output characteristics. This means that the same devices can generate a phase-shifted output and an output with double the frequency by simply adjusting the input voltage range. This research is particularly meaningful since it demonstrates not only the potential of 2-D materials but also their potential for direct application to the semiconductor industry. These findings will contribute to the development of system IC technology and various applications.

Energy storage is one of the leading problems being faced globally, due to the population explosion in recent times. The conventional energy sources that are available are on the verge of extinction, hence researchers are keen on developing a storage system that will face the upcoming energy needs. Supercapacitors, also known as ultracapacitors or electrochemical capacitors, are advanced energy storage devices characterised by high power density and rapid charge–discharge cycles. Unlike traditional batteries, supercapacitors store energy through electrostatic separation, offering quick energy release and prolonged operational life. They hold exceptional performance in various applications, from portable electronics to electric vehicles, where their ability to deliver bursts of energy efficiently complements or replaces conventional energy storage solutions. Ongoing research focuses on enhancing energy density and overall efficiency, positioning supercapacitors as pivotal components in the evolving landscape of energy storage technologies. A novel electrode material of NiO/CuO/Co3O4/rGO was synthesized which when used as a supercapacitor, the highest value of CS is 873.14 F/g which is achieved for a current density of 1 A/g under with an energy density of 190 Wh/kg and the highest power density of 2.5 kW/kg along with 87.3% retention after 5000 GCD cycles under 1 M KOH.

Undeclared nuclear activities are challenging given the lack of information from the sites involved in such activities. Wide-area environmental sampling (WAES) can be an effective method to detect undeclared nuclear activities. However, it is crucial to address the potential risks during the WAES, including sample tampering or extortions. Therefore, tracking and monitoring of various on-site data is imperative to accurately interpret the status of samples and workers throughout the WAES process. ‘Environmental and Geographical Data Transfer (EGDT)’ was developed for the real-time monitoring of integrated on-site data. EGDT module is equipped with various sensors and can be attached to a worker’s uniform or a sample storage box. This study demonstrated the technical effectiveness of EGDT by exploring three experimental methodologies for feasibility assessment. Compared to the Normal Operation case, the inference of the Sample Extortion case was predominantly based on changes in lux and dose rate. The inference of the Out-of-Work-Area case primarily relied on changes in dose rate and acceleration. Finally, the preliminary evaluation of the performance of the developed prototype was conducted, and a foundation was established for enhancing the application in the WAES process.