In recent years, electric shock accidents at industrial sites continue to occur, and various measures are being taken to reduce accidents. Among them, safety education is mentioned as a basic measure for the prevention of industrial accidents and the protection of workers. This study attempted to empirically analyze the effect of electrical safety education on safety consciousness and safety behavior and verify whether it is effective. To this end, a total of 343 people, including workplace managers and workers, were surveyed, and frequency analysis, factor analysis, reliability analysis, correlation analysis, and simple linear & hierarchical regression analysis were conducted using the SPSS 24.0 statistical program. As a result of the analysis, first, it was found that the higher the electrical safety education, the more positive (+) effect was on the safety consciousness. Second, it was found that the higher the electrical safety education, the more significant positive (+) effect was on safety behavior. Third, it was found that the higher the safety consciousness, the more positive (+) effect was on safety behavior. Finally, it was verified that safety consciousness plays a partial mediating role in the influence of electrical safety education on safety behavior.

This study systematically analyzed the causes of recurring electric shock accidents using accident analysis techniques and attempted to suggest implications for accident prevention. 124 electrocution death accidents that occurred from 2017 to 2022 were analyzed and classified into four factors(organizational influence, unsafe supervision, preconditions for unsafe acts, and unsafe acts) using the HFACS technique. As a result, First, in terms of organizational influence, many issues related to organizational processes were found, and the main causes were the lack of a safety management manual for electrical work, the lack of risk assessment, and the lack of safety procedures for electrical work. Second, in terms of unsafe supervision, the main causes were inappropriate operations such as not assigning a work supervisor during work or the lack of actual management and supervision. Third, in terms of preconditions for unsafe acts, the main causes were physical and technical problems such as not performing power outage work or not taking protective measures for live parts. Fourth, in terms of unsafe acts, the main causes were analyzed to be violations of safety procedures such as workers mistaking a power outage or not recognizing a current leakage condition, making a wrong judgment of the situation, and shortening the work time and working without safety measures for work convenience. Additionally, when examining whether the personal characteristics of those who died from electric shock had significant differences in unsafe behaviors, it was confirmed that there were significant differences in violations or decision-making errors depending on the industry and electrical-related major.

Evaluating the performance of asphalt concrete using CT scanning has become an essential area of research due to its potential to revolutionize the way we assess road materials. Traditional methods often require destructive sampling, which can damage infrastructure and offer limited insight into the material's internal structure. In contrast, CT scanning provides a non-destructive, highly detailed analysis of asphalt's internal features, such as air voids, aggregate distribution, and binder coverage, all of which are critical to its durability and performance. Additionally, the ability to create 3D models from CT scans allows for deeper insights into factors like void connectivity and aggregate bonding, which directly affect the lifespan of pavements. By combining CT imaging with advanced data processing techniques, such as deep learning, this research offers more accurate and reliable methods for optimizing asphalt mix designs, ultimately leading to longer-lasting roads, reduced maintenance costs, and more sustainable construction practices.

본 논문에서는 해상 위험유해물질(Hazardous Noxious Substances, HNS) 사고의 효과적인 대응을 위해 개발된 부유식 무인이동체 기반 광역탐지 및 모니터링 시스템의 운용 시나리오 설계와 실험 검증 내용을 보인다. 광역탐지 및 모니터링 시스템은 장시간 운용이 가 능하되 제한적 이동이 가능한 무계류형 부이 형태를 갖는 부유식 무인이동체 플랫폼을 기반으로 개발되었으며 임무 수행에 필요한 열화 상 카메라, 레이더, 부유 및 대기 HNS의 탐지를 위한 센서가 탑재되었다. 실험 검증 과정에서는 탐지 센서 성능을 야외 환경에서 실험적 으로 검증하기 위해 이동식 가스 유출 시스템(Portable Gas-exposure System, PGS)을 추가로 설치하였다. 무인 시스템의 원격 및 자율 운용을 위해 전체 운용 소프트웨어는 로봇운영체제(Robot Operating System, ROS) 프레임워크를 기반으로 통합되었다. 내수면 및 실해역에서의 실 험을 통해 개발된 시스템의 운용 및 활용 가능성을 실험적으로 검증하였다.

PURPOSES: This study investigates the effect on concrete pavement accordance with the curing methods in cool weather and supports the best method in the field. METHODS: Two field tests evaluated the curing methods of concrete pavement in cool weather. Firstly, five curing methods were tested, including normal curing compound, black curing compound, bubble sheet, curing mat, and curing mat covered with vinyl. Concrete maturity was compared from temperature data. Secondly, normal curing compound and curing mat with vinyl, which showed the best performance, were compared in terms of maturity and join condition index. RESULTS: From the field tests, it is an evident that curing mat with vinyl accelerated the concrete strength. Therefore, it is possible to conduct saw-cut works in cool weather, which minimizes damage on concrete at joint. CONCLUSIONS: For concrete pavement in cool weather, using curing mat with vinyl as the curing method could overcome the strength delay. Therefore, strength and durability problems on concrete at joint due to cool weather would be fewer in the future.

PURPOSES : This paper focuses on strength development according to the mix design with cement type and mineral admixture from laboratory and field tests in cool weather. METHODS : Two methods evaluated the mix design of concrete pavement in cool weather. Firstly, laboratory tests including slump, air contents, setting time, strength, maturity, and freezing-thawing test were conducted. Three alternatives were selected based on the tests. Secondly, a field test was conducted and the optimum mix design in cool weather was suggested . RESULTS : It is an evident from the laboratory test that a mix with type Ⅲ cement showed better performance than the one with type Ⅰ cement. There was a delay in strength development of a mix with mineral admixture compared to mix design without any mineral admixture. In the field test, type Ⅲ cement+flyash 20% mix design proved the best performance. CONCLUSIONS : For concrete pavement in cool weather, mix design using type Ⅲ cement could overcome the strength delay due to mineral admixture. Moreover, it is possible to make sure of durability of pavement. Therefore, strength and durability problems due to cool weather would decrease.

감자는 세계에서 4번째로 중요한 식량작물로 식품 및 사료로 이용되고 있다. 감자의 주요 소비형태는 일반식용 위주와 전분, 감자칩, 감자튀김 등 다양한 형태의 가공제품, 씨감자 형태로 사용한다. 또한 감자를 식품산업과 제지 산업에서 활용하기 위해 amylose 함량을 감소시키거나 acrylamide 생성을 줄인 유전자변형 감자가 개발되고 있다. 이 에 따라 우리나라의 경우 감자 가공품 수입이 많은 만큼 국내외 감자 제품에 대한 미승인 유전자변형 감자에 대한 검사법이 필요하다. International Service for the Acquisition of Agri-biotech Applications (ISAAA) 보고에 따르면 2016 년까지 45개의 GM 감자이벤트가 개발되었다. 이 중 우리나라는 식품의약품안전처로부터 4종의 GM 감자가 식품용 도로 승인되었다. 본 연구에서는 현재 미승인 유전자 감자 6개 이벤트에 대해 정성검사용 표준플라스미드 (pUC_GM potato A and B)를 제작하였으며, UDP-glucose pyrophosphorylase (UGPase) gene을 감자 내재유전자로 사용했다. 개발 된 표준플라스미드는 식품의약품안저처의 고시를 토대로 primers와 probes를 이용하여 Applied Biosystems ViiA7 real-time PCR system을 통해 정성분석을 수행하였다. 또한 검정한계치를 확인하기 위해 플라스미드를 100,000 - 10 copies까지 희석한 것을 주형으로 하여 real-time PCR을 진행하였다. 이와 같이 미승인 유전자변형 감자에 대한 정성 분석용 표준플라스미드가 개발되었으며 국내 미승인 유전자변형 감자에 대한 모니터링에 활용될 수 있을 것으로 기 대한다.

본 연구에서는 신규 승인 및 승인 예정인 유전자변형 콩 5개 이벤트(SYHT0H2, DAS-44406-6, MON87751, DAS-81419-2, DAS-68416-4)의 정량분석에 사용할 시험대조물질로써 플라스미드(pUC-GM soy C, D)를 개발하였다. 각각의 표준플라스미드는 콩 내재유전자인 lectin의 증폭서열을 포함하고 있으며, pUC-GM soy C에는 4개의 이벤트가, pUC-GM soy D에는 하나의 이벤트가 포함되었다. Applied Biosystems의 Viia7 real-time PCR을 통해 개발된 표준플라 스미드에 대한 검증실험을 실시하였다. 정량분석에 사용된 프라이머, 프로브는 식품공전에 고시되어 있는 것을 사용 하였다. 정량분석을 위한 표준곡선은 20, 200, 2000, 20000, 200000 copies로 희석한 표준플라스미드를 이용하였으며, R2는 0.993-1.000, 표준편차(standard deviation, SD)는 0.01-0.18로 확인되었다. 이와 같이 개발된 표준플라스미드 (pUC-GM soy C, D)가 5개 유전자변형 콩의 정량검사에 calibrator로 사용될 수 있음을 확인하였다.

In this study, an externally reinforced structural system for SMC(Sheet Molding Compound) panel water tank, designed according to the Japanese design code, is experimented to evaluate its seismic performance. The test tank is 3m long, 2m wide and 3m high, considering the capacity and size of the shaking table. The measured hydrodynamic pressures are found to be approximately 70% of the Japanese design code values. It may be partially due to the convex shape effect of the unit panels. The analytical results of externally reinforced system based on the measured dynamic water pressures are found in good agreement with the test results. If the design hydrodynamic pressures are estimated properly, the proposed analytical model for the externally reinforced water tank becomes a useful design tool and the Japanese design code is found to provide a safe design for the external frames of SMC panel water tank.

This study aims to investigate and analyze the differences in each background variable of high school students’ attitude toward and satisfaction with PE classes in block-time system, a method of class form by 2009 Revised Curriculum and to seek for a plan