Colloid-facilitated migration has been significantly concerned with the acceleration of the radionuclide mobility in the HLW repository. In the repository system, the compacted bentonite, which is the buffer material, could be the major source for colloid generation; hence, the understanding of colloid generation from the bentonite is the essential to expect the colloid-facilitated radionuclide migration. This study aimed to investigate the colloid generation using a bentonite-based micro-scale flow path system, which called microfluidics. In order to fabricate the microfluidics, direct milling method was applied to make a mold by computer numerical control. The fabricated mold applied to prepare the microfluidic chip by Polydimethylsiloxane (PDMS), in which the size of microchannel was designed to be one micrometer. Initially, sylgard 184 and curing agent mixed and stirred for 10 min, afterwards the bubbles in the paste was removed in the vacuum desiccator for 30 min. Then the paste was poured into the mold, and finally dried for 4 hours at 80°C in a dry oven. The compacted Ca-bentonite chip was prepared by the cold isostatic pressing (CIP) method with the dry density of 1.6 g·cm−3. The microfluidic chip and compacted bentonite chip were assembled by an acryl jig, the flow rate was adjusted by 20 mL syringe equipped syringe pump. The degree of colloid generation accompanied with the erosion of bentonite was gravimetrically examined after the experiment. The effect of the pH and ionic strength on the colloid formation was investigated through the particle size, stability and aggregation. To the best of our knowledge, this is the first examination for the colloid generation using microfluidics; these results would give information to understand the colloid formation from the compacted Ca-bentonite in the HLW repository system.

오늘날 게임 산업은 지속적으로 성장하고 있는 추세이다. 이런 배경에서 게임 이용자들은 다양한 게임 장르를 경험하고 있으며, 또한 게임 내의 승률을 높이기 위한 다양한 활동에 많은 관심을 가지고 있다. 게임 이용자 들은 자신이 즐기는 게임 캐릭터들의 승률 및 픽률과 같은 다양한 정보들을 인터넷 검색을 통해 수집하고 있 으며, 그에 따라 자신이 즐기는 게임 플레이어의 밸런스에 관해서 많은 관심을 나타내고 있다. 본 연구자는 밸런스 관련 다양한 연구를 탐색하는 과정에서 게임 속의 밸런스를 맞추는 기준이 있다면, 또한 그 기준에 대 한 예측이 가능하다면 그 기준을 중심으로 이용자들의 다양한 밸런스 패치 활용 및 게임 전략 수립에 도움이 될 수 있을 것으로 판단하였다. 본 연구에서는 플레이어들의 밸런스 패치가 중요하게 인식되고 있는 MOBA 장르 게임을 중심으로 밸런스 패치 예측 기준을 수립하는 데 초점을 맞추었다. 특별히 밸런스 패치를 진행할 때 캐릭터들의 특성 및 개발자의 패치 코멘트, 그리고 승률 및 픽률 변화에 따른 이후 패치 로드맵까지 고려 할 수 있는 체계를 제시한 점에서 큰 의의가 있다고 볼 수 있다. 이를 통해 개발자는 플레이어들의 밸런스를 더 쉽게 맞출 수 있도록 유도하고, 플레이어는 밸런스 패치를 예측하여 더욱 효율성 있는 게임 전략을 실행할 수 있도록 유도하여 MOBA 장르 게임의 이해관계자 모두에게 도움이 되는 정보를 전달할 것이다.

One of the leading pests of rice, small brown planthopper (Laodelphax striatellus) can grow up to have either short or long wings, depending on conditions. However, under the same breeding conditions, the phenotypes of the long- and short-winged small brown planthopper observed to keep the first collected phenotype. To investigate the mechanism involved in wing dimorphism, metabolomic researches have been conducted. In this study, we observed several metabolites change, and the difference of metabolites could provide clues to the relationship between physiological changes in the small brown planthopper and ecological transport.

Streptomyces species have been studied to find potent pest control agents as an alternatives to chemical insecticides.Previously, one of the ethyl acetate extract of Streptomyces isolates cultured on unpolished rice medium showed highlevel of juvenile hormone antagonist and larvicidal activities against pest insects including Aedes albopictus, Plutella xylostellaand Laodelphax striatellus. It has been known that the biosynthesis of secondary metabolites of Streptomyces could beinfluenced by a variety environments such as nutritional composition and growth conditions. In this study, to optimizeculture conditions for stable production of insecticidal compounds from this isolate, binding assay and bioassay-guidedmonitoring were conducted using various culture conditions.

This study was carried out to investigate insect community structure from different habitats in Baengnyeong island.We performed day and night collection at two different habitats (mountain, rural area) of Baengnyeong island from Mayto September in 2015. A total of 2,879 individuals of 404 species, 81 families belonging to 10 orders were collectedand identified. A dominant species was Idisia ornata Pascoe (Tenebrionidae) despite a very low percentage (6.04%) ofthe species among the catches. Results of independent t-test showed a significant high (p<0.001) of species richness onmountain. Also, seasonal results of ANOVA (Analysis of variance) were significantly influential with species abundanceand species richness. The result of NMDS analysis showed that the community structure of the insects from the mountainis different with rural area.