본 연구는 수소 탱크를 고정하는 강재 볼트의 부식으로 인한 성능 저하 문제를 해결하기 위해 내부식성 복합재료로 알려진 Glass Fiber Reinforced Polymer (GFRP) 및 Carbon Fiber Reinforced Polymer (CFRP)를 활용한 앵커 시스템을 제안하고, 이를 지진 하 중 하에서의 안전성 평가를 통한 적용 타당성 검토를 수행하였다. 연구에서는 현장 조사를 통해 실제 사용 중인 수소 탱크의 설계 제 원을 확보한 후 이를 바탕으로 유한요소해석을 수행하였으며, AC 156 인공 지진파를 적용하여 FRP 앵커 볼트와 기존 강재 앵커의 성 능을 비교 분석하였다. 주요 분석 결과, FRP 앵커 볼트를 적용한 수소 탱크는 강재 앵커 볼트에 비해 고유 진동수가 21% 증가하여 구 조적 강성이 향상됨을 확인하였다. 또한, 가속도 응답 분석 결과 FRP 앵커 볼트는 상부 가속도를 감소시켜 지진 하중에 대한 저항성을 증진하는 것으로 나타났다. 응력 해석에서는 FRP 앵커 볼트가 강재 앵커 볼트에 비해 유효 응력이 약 91% 감소하여, 구조적 안전성이 크게 개선되었다. 그러나, FRP 앵커 볼트 적용 시 기초 콘크리트에 가해지는 쪼갬 인장 응력이 강재 앵커 대비 최대 3.5배 증가하는 것으로 나타났으며, 이에 따라 FRP 앵커 볼트 사용 시 기초 콘크리트의 보강이 필요할 것으로 사료된다. 이러한 연구 결과는 수치해석 에 국한된 결과로, 향후 실제 지진 하중을 모사한 실험적 검증이 필요하다. FRP 앵커 볼트의 적용 가능성은 향후 연구를 통해 광범위 하게 평가될 것이며, 이를 통해 수소 인프라의 내구성과 안전성을 더욱 강화할 수 있을 것으로 기대된다.

Legacy waste from the decommissioned A-1 nuclear power plant in the Slovak Republic is scheduled for immobilisation within a tailored alkali borosilicate glass formulation, as part of ongoing site cleanup. The aqueous durability and characterisation of a simulant glass wasteform for Chrompik III legacy waste, was investigated, including dissolution experiments up to 112 days (90°C, ASTM Type 1 water). The wasteform was an amorphous, light green glassy product, with no observed phase separation or crystalline inclusions. Aqueous leach testing revealed a suitably durable product over the timescale investigated, comparing positively to other simulant nuclear waste glasses and vitreous products tested under similar conditions. Iron and titanium rich precipitates were observed to form at the surface of monolithic samples during leaching, with the formation of an alkali deficient alteration layer behind these at later ages. Overall this glass appears to perform well, and in line with expectations for this chemistry, although longer-term testing would be required to predict overall durability. This work will contribute to developing confidence in the disposability of vitrified Chrompik legacy wastes.

We give a detailed description of the installation and operation of a double-station meteor detection system which formed part of a research & education project between Korea Astronomy Space Science Institute (KASI) and Daejeon Science Highschool. A similar system is currently not existing in South Korea. A total of six light-sensitive CCD cameras were installed with three cameras at SOAO and three cameras at BOAO observatory. A double-station observation of a meteor event enables the determination of the three-dimensional heliocentric orbit in space. This project was initiated in response to the Jinju reball event in March 2014. The cameras were installed in October/November 2014. The two stations are identical in hardware as well as software. Each station employes sensitive \Watec-902H2" cameras in combination with relatively fast f/1.2 lenses. Various elds of views were used for measuring dierences in detection rates of meteor events. We employed the SonotaCo UFO software suite for meteor detection and their subsequent analysis. The system setup as well as installation/operation experience is described and rst results are presented. We also give a brief overview of historic as well as recent meteor (fall) detections in South Korea. For more information please consult http://meteor.kasi.re.kr.

Tobacco whitefly-Bemisia tabaci is considered one of the most important pests in tropical and subtropical agriculture, as well as in production systems in glasshouses in temperate zones. Principle research on the identity of B. tabaci began with the recognition of more than one biotype differing in life history parameters, host plant associations, plant-related damage and insecticide resistance. Our laboratory strains of B. tabaci were identified and classified as biotype B and Q, through mtCOI PCR. Also, they were tested for their host plant preference and reaction to different insecticide. Biotype Q prefers to feed on red pepper and tomato, was less susceptible to tested insecticides, for instance acetamipirid, spinosad and thiamethoxam, than the biotype B (feed on tomato alone). There has been a report on the presence of gut bacteria in B. argentifolii (= B. tabaci biotype B) and its influence on the host insect processes. Hence, as a further pursuit, we examined our laboratory B. tabaci biotypes B and Q for their gut bacteria, whether these two biotypes are differed with each other. Gut bacterial strains isolated by standard surface sterilization method was identified through 16S rRNA gene sequence. Gut bacterial strains of B. tabaci biotypes B and Q and their close relatives retrieved from the public database (NCBI) indicated that the biotype B was less diversified only with four genera viz., Bacillus, Micrococcus, Pseudomonas and Staphylococcus, whereas the biotype Q diversified with six such as Bacillus, Janibacter, Micrococcus, Staphylococcus, Stenotrophomonas, and Streptomyces. Results of the present investigation suggesting that there may be a relationship with gut bacterial strains and susceptibility to insecticides and host plant preference of B. tabaci biotype B and Q.