Safe radiation management is essential not only for operational nuclear power plants but also for nuclear plants to be decommissioned. When spent nuclear fuel is present on-site, meticulous radiation emergency plans are necessary to ensure safety. In Korea, numerous radiation emergency plans have been established for operational nuclear reactors. These plans delineate distinct response mitigation measures for white, blue, and red emergencies. However, clear regulations are yet to be devised for radiation emergency plans for reactors to be decommission. Therefore, this study investigated the decommissioning plan and status of Kori unit 1 to comprehensively analyze the current status of decommissioning safety in Korea. In this study, radiation emergency plans of decommissioning nuclear power plants abroad were reviewed to confirm radiation emergency action levels. Furthermore, radioactive waste treatment facilities, to be used for decommissioning reactors in Korea were evaluated. Moreover, the study assessed emergency plans (especially, emergency initiating conditions) for operational nuclear power plants in Korea for potential use in the decommissioning phase. This study proposed an emergency initiating condition that can be used for decommissioning reactors in Korea. Considering the anticipated introduction of plasma torch melting facility in Korea, this study examined the conditions of radiation emergency plans can be altered. This study identified effective measures and guidelines for managing radiological emergency initiating conditions, and effective decommissioning of nuclear power plants in Korea.

To broaden the utilization of nuclear energy, uranium as a fuel should be mined indispensably. Mining accounts for the largest portion of the cost of producing the uranium assembly. Therefore, this study analyzes the trends of uranium prices, which have a significant impacts on the mining cost. Uranium production contributing to the price fluctuations is explained in five periods from 1945 to the present. Moreover, the series of events affecting uranium prices from the 1970s until the present are verified. Among them, the most recent incidents considered in this study are the following: COVID-19 pandemic, Kazakhstan unrest, and Russia-Ukraine war. European countries have started to reconsider the transition to nuclear power to reduce their dependence on Russian oil and gas, which has contributed to the surge in uranium prices. Based on the results of this study, various international issues have been closely associated with the nuclear power industry and uranium, affecting the production of uranium and its price.

본 연구는 한국어 읽기 교육 중 최근 관심을 받고 있는 ‘Extensive Reading’(이하, 열린 읽기)을 한국어 수업과정으로 도입하기 위한 여러 가지 방향을 제시하고 있다. 이를 위해, 한국어 교육 현장의 설문 조사를 실시하였다. 그리고 구체적인 방안의 제시를 위해 일본 내 대학 중 일본어 교육(JSL)을 실시하고 있는 早稲田大学(이하, 와세다 대학)의 열린 읽기 수업을 모델로 삼아 열린 읽기 수업의 한국어 수업 도입 방안을 모색했다. 그 결과, 열린 읽기 수업의 도입을 위해서는 첫째, ‘수업의 다양화’, 둘째, 교사들이 많이 지적한 부분으로 ‘학교의 제도개선 및 지원’, 마지막으로는 ‘교사와 학습자들의 적극적인 참여’가 필요함을 제시했다.

외국어로서의 한국어 교육의 일차적인 목표는 의사소통 능력을 향상시키는 것이다. 의사소통 능력이란 말하기와 듣기, 읽기와 쓰기까지 포함하기에 어느 것 하나 소홀히 할 수 없다. 하지만 최근 한국어 교육에서 읽기와 쓰기의 연구는 짧고, 구체적인 쓰기 교육에 대한 방안도 부족한 실정이다. 또한 유창성의 흐름에 따라 학습자들이 말하기보다 쓰기 실력은 그 아래 단계에 머무는 한계가 드러나고 있다. 본고에서는 그 해결책의 하나로 문법지식을 활용한 일기쓰기를 제안하고자한다. 일기는 학습자들의 경험을 토대로 생각과 느낌을 표현하게 해 주면서 말하기를 확대시키는 도구가 되기도 한다. 또한 문법지식을 활용한 일기쓰기 연습을 통해 오류를 최소화하고 다음 단계로 나아갔을 때 정확하고 안정된 표현을 사용할 수 있도록 도움을 줄 것이다. 따라서 직접 학습자들에게 실험을 통해서 그 효과를 확인하고자 한다.

Chlorine-containing modified polyester polyols were synthesized by two-step condensation reactions. Intermediate was synthesized by the esterification of monochloroacetic acid with trimethylolpropane in the first step. Polycondensation of the intermediate (MCAOs), 1,4-butanediol, and trimethylolpropane with adipic acid was carried out. Two-component polyurethane (PU) coatings were prepared by blending MCAOs and IPDI-isocyanurate. There new flame-retardant coatings showed various properties comparable to other non-flame-retardant coatings. They were superior to flammable coatings from the experimental results showing rapid and 10 to 13 hours of pot-life. Coatings with 30wt% monochloroacetic acid was not flammable by the vertical flame retardancy test.

한국산 시베리아뽀족반날개속에 대한 분류학적 재검토를 시도하였다. 3종의 한국산 미기록종이 밝혀졌다 [Tachinus (Tachinoderus) nigriceps Sharp, Tachinus (Tachinus) sharpi Bernhauer & Schubert, and Tachinus (Tachinus) yezoensis Li]. 한국산 시베리아뾰족반날개속은 총 5종이 되며, 종 기재를 하였고 진단 형질을 도식하였다.

This study attempts to propose the possibility of the sex reversal in Tegillarca granosa and Ruditapes philippinarum by confirming the changes in the sex ratio with the shell length (SL) in the same population level. For analysis of sex ratio with SL, 1500 individuals of T. granosa (SL 10.1-45.0 mm) and 712 individuals of R. philippinarum (SL 15.1-70.0 mm) were used. Sex was analyzed histologically. The average sex ratios (F:M) of T. granosa and R. philippinarum were 1:1.22 and 1:0.96, respectively. However, sex ratio was found to differ when the clams were divided into groups according to SL in 5.0 mm intervals. Both species displayed the tendency of increase in the proportion of female with increase in SL. In this study, changes in the sex ratio in accordance with the growth of T. granosa and R. philippinarum are determined to be indirect evidence that signifies their sex reversal.