The acoustic emission (AE) is proposed as a feasible method for the real-time monitoring of the structural damage evolution in concrete materials that are typically used in the storage of nuclear wastes. However, the characteristics of AE signals emitted from concrete structures subjected to various environmental conditions are poorly identified. Therefore, this study examines the AE characteristics of the concrete structures during uniaxial compression, where the storage temperature and immersion conditions of the concrete specimens varied from 15℃ to 75℃ and from completely dry to water-immersion, respectively. Compared with the dry specimens, the water-immersed specimens exhibited significantly reduced uniaxial compressive strengths by approximately 26%, total AE energy by approximately 90%, and max RA value by approximately 70%. As the treatment temperature increased, the strength and AE parameters, such as AE count, AE energy, and RA value, of the dry specimens increased; however, the temperature effect was only minimal for the immersed specimens. This study suggests that the AE technique can capture the mechanical damage evolution of concrete materials, but their AE characteristics can vary with respect to the storage conditions.

The risk of various hazardous substances in aquatic environment comprises not only the concentration of substances in the environmental medium but also their accumulation in fish through complex food web and the health risks to humans through the fish. In Korea, the monitoring of residual toxicant in aquatic ecosystems began in 2016 following the enforcement of the Acts on registration and evaluation for the management of chemicals used in daily life (consumer chemical products), and attention has been paid to potentially hazardous substances attributed to them. Recently, studies have been carried out to investigate the distribution of these hazardous substances in the ecosystem and calculate their emission factors. These include the accumulation and transport of substances, such as detergents, dyes, fragrances, cosmetics, and disinfectants, within trophic levels. This study summarizes the results of recently published research on the inflow and distribution of hazardous substances from consumer chemical products to the aquatic environment and presents the scientific implication. Based on studies on aquatic environment monitoring techniques, this study suggests research directions for monitoring the residual concentration and distribution of harmful chemical substances in aquatic ecosystems. In particular, this study introduces the directions for research on trophic position analysis using compound specific isotope analysis and trophic magnification factors, which are needed to fulfill the contemporary requirements of selecting target fish based on the survey of major fish that inhabit domestic waters and assessment of associated health risk. In addition, this study provides suggestions for future biota monitoring and chemical research in Korea.

The purpose of this study is to analyze information about dietary information presented in the television broadcast media in order to determine the optimal communication method that will provide desirable information to the general public. To that end, stakeholders were recruited and trained before and during the study. Three airwaves broadcasters and four comprehensive programming channels were monitored for Three months. The results are as follows. In total 172 food and nutrition programs are reported on. As information from the monitored programs was investigated, results showed a frequency of 136 separate informative programs (79.1%) and 36 entertainment programs (20.9%). Second, the broadcasters included are KBS, MBC, SBS, while the channels are TV Chosun, JTBC, Channel A, and MBN. Third, 109 reports (63.3%) were about ingredients & cuisine, followed by 63 reports (36.7%) on health and diet. This research provides transitional knowledge regarding the correlation between dietary information and the media. Moreover, this research contributes to advocating public health by enhancing the quality from broadcast media about dietary information.

수용자의 급증에 따른 시설 내 교정에 대한 반성과 위치추적시스템 등 과학기술의 발전에 따라 효과적으로 시설 내 교정을 대체할 수 있는 제재수단으로 전자감독제도 가 도입되게 되었다. 즉 전자감독제도는 사회 내 교정이론과 과학기술의 결합점이다. 전자감독제도는 외국에서는 교도소 과밀문제 해소, 교도소 신설비용의 절감, 단기자유 형의 대체 목적으로 도입되었으나, 우리나라에서는 2008년 성범죄자에 대한 감시목 적과 재범방지목적으로 도입되었다. 이후 대상범죄가 확대되는 과정을 거쳐, 2020년 일반사범에 대한 가석방에도 도입되어 대상이 대폭 확대되었다. 대상자의 전면 확대 로 2020년 피부착자 수가 2배 이상 증가하였으나, 부착명령 기간은 3월 미만이 전해 의 42명에서 1,137명으로 대폭 증가한 것으로 나타났다. 위 증가된 부분은 모두 일반 사범 가석방자로 보이고, 전체 가석방자 수는 2020년의 경우 전해에 비하여 증가하지 않았다. 전자감독장치 부착대상의 확대가 당초 의도한 교도소 과밀화에는 전혀 도움 이 되지 못하고, 오히려 전담인력에 대한 과중한 관리 부담만 증가시킨 것이다. 단기부착명령의 남발은 제도의 목적달성 보다는 부작용만 발생시키므로 현행법 하에서도 일반사범 가석방자에 대한 3월 미만 부착명령을 가급적 제한하여 운영하고, 향후 법 개정에 이를 반영할 필요가 있다. 19세기 교정시설에서 20세기 교정공무원이 21세기 수용자를 관리하고 있다는 현실에 비추어 보면 전자감독제도는 21세기 사회 내 교정 수단이다. 일반사범 가석방자에게 단기 부착명령을 남발하는 것은 21세기 교정수단을 20세기 사고의 틀에 가두어 두는 것에 불과하다. 전자감독제도의 장점을 극대화시키 기 위해서는 현행법은 후방형 전자감독제도만 채택하고 있으나 과감하게 전방형 전자 감독제도를 도입할 필요성이 있다. 가석방에 기계적으로 단기 부착명령을 남발하는 탁상행정, 책임회피행정을 지양하고, 발부기관과 집행기관의 상호 유기적 소통과 법개 정을 통한 전방형 전자감독제도의 도입으로 전자감독제도의 올바른 정착을 기대해 본다.

PURPOSES : The purpose of this study was to investigate the long-term trend of internal strain within the continuously reinforced concrete pavement (CRCP) based on measurements. METHODS : The strains of the concrete and reinforcing bars were measured at two induced cracks and one construction joint. The analysis was performed using data accumulated over five years from the concrete placement. The effects of the initial construction conditions were investigated by comparing the strains and stresses at each location. RESULTS : In the long-term behavior, the highest tensile strains of the concrete and rebar were observed from December to January, and the lowest tensile or the highest compressive strain was observed from July to August. A lower rebar stress was measured in the construction joint, which has a higher steel ratio than that of cracks. As the distance from the crack and joint increased, the rebar strains decreased. Higher tensile strains of the concrete and rebar were measured where a higher concrete setting temperature occurred. A gradual decrease in the maximum concrete tensile strain was observed in the five-year measurements. However, in the case of reinforcing bars, stress reduction with time was not observed in the long-term behavior. CONCLUSIONS : Although a gradual decrease in concrete strain was revealed by long-term measurements, it is predicted that minimizing the concrete setting temperature to reduce the initial tensile strain could effectively increase the fatigue strength of CRCP

복숭아는 대표적인 여름 과일이자 알레르기를 유발하는 식품으로 밀폐되고 집약적인 생산환경으로 인해 시설 내 유기분 진, 농약, 복숭아털이 발생하기 때문에, 열악한 작업환경으로 인한 작업자들이 어려움을 많이 겪고 있다. 본 연구에서는 복 숭아 선별작업장에서 발생하는 미세먼지를 위치별, 작업별, 입경별로 모니터링함으로써 저감 및 대책 마련을 위한 기초자 료를 확보하고자 하였다. 미세먼지 모니터링 결과 지역별로 는 선별과정에서 미세먼지의 발생이 높은 것으로 나타났으며, 주로 기계적인 과정을 통하여 발생하는 10μm 이상의 미세먼 지로 나타났다. 본 연구를 바탕으로 향후 작업환경의 개선을 위해서 공정 중 미세먼지가 주로 발생하는 지역 및 미세먼지 의 물리적 특성을 고려하여 저감시설 및 개인보호구의 착용이 요구된다.

The Ministry of Oceans and Fisheries promoted the installation of eel-ladder for the purpose of creating inland water resources. Currently, eel-ladder have been installed and operated at the Geumgang Estuary Bank (2018), Yeongam Embankment (2019), and Asanman Embankment (2020). In this study, the number of glass eels in eel-ladder in 2021 was monitored and factors affecting the rise that from ocean to river of eels were investigated. Glass eels in eel-ladder were found when the salinity was relatively low, and they started when the freshwater and seawater temperatures were above 20℃. Comparing the number of occurrences by year, the largest number of glass eels was observed in 2021, but it is judged that this is not according to the distribution of glass eels in sea, but rather as a result of the investigator’s eel-ladder repair and guidance on illegal fishing.