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Chang K.-H.,Kyung Hee University | Doi H.,Hiroshima University | Nishibe Y.,University of Tokyo | Nam G.-S.,Rural Research Institute of Korea Rural Community Corporation | Nakano S.-I.,Kyoto University
Journal of Ecology and Environment | Year: 2014

Feeding behavior of Temora turbinata was investigated through laboratory experiments with special emphasis on its food preference and consequent clearance rate on diatom and microbial components given as common natural food assemblage of coastal area (Uchiumi, Uwa Sea, Japan). Among available prey items, T. turbinata showed the highest clearance rate for Thalassiosira spp. (0.23 ± 0.08 L Temora-1day-1) followed by Chaetoceros spp. (0.11 ± 0.03 L Temora-1day-1), but clearance rates for other diatom, Nitzschia spp. was lower (0.03 to 0.07 L Temora-1day-1). Bacterial abundances showed no response against 24-h feeding of T. turbinata. Feeding of T. turbinata on heterotrophic nanoflagellates (HNF) was apparent when clearance rates of T. turbinata on diatoms were relatively low, but T. turbinata did not consume HNF as well as ciliates with Thalassiosira spp. of which clearance rate was highest. The results suggest that HNF and ciliates are possible supplementary prey item for T. turbinata, but their contribution as food sources can be limited by the presence of other prey items such as preferable diatom species. © 2014 The Ecological Society of Korea. All rights are reserved.

Kim Y.,Rural Research Institute of Korea Rural Community Corporation | Suh J.,K water Institute of Korea Water Resources Corporation | Cho J.,Rural Research Institute of Korea Rural Community Corporation | Singh S.,Rural Research Institute of Korea Rural Community Corporation | Seo J.,Wacon Corporation
International Journal of Control and Automation | Year: 2015

Recently the importance of the management technologies for prevention increases. There are many kinds of pipelines under the ground of cities which have pipelines for waterworks, wastewater, oil, gas, electronic power, communications, heat energy, and so on. And these underground pipelines have different roles in supply the essential resources for citizens of cities and will be more important for citizens increasingly. So we call these pipelines as "LifeLine." By the way, these pipelines do not support their core roles to citizens and we can easily see that pipeline accidents have given inconvenient facts or serious man-made disasters to modern citizens as well. For examples, road settlement and sinkholes, waterworks leaks, pollutions by wastewater and oil, explosions by gas, and so on. Nowadays, we live in times using ICT - sensor technologies. So these environments have been advanced and are probably possible to resolve pipeline management problems using them beforehand in real time. Thus, ICT convergences will encourage us to make new technologies and paradigms on the field of pipeline management. © 2015 SERSC.

Shin E.C.,Incheon National University | Kim S.H.,Incheon National University | Oh Y.I.,Rural Research Institute of Korea Rural Community Corporation
9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010 | Year: 2010

This paper is reported the result of the laboratory tests and field plate load test in order to evaluate the reinforcement effect of geocell for road construction. The geocell-reinforced subgrade gives the increment of cohesion and friction angle with comparison of non-reinforced subgrade. In addition, the field plate load test was performed on the geocell-reinforced subgrade to estimate the bearing capacity of soil. The theoretical bearing capacity of subgrade soil with and without geocell reinforcement was estimated by using the soil internal friction angle. The field plate load tests were also conducted to estimate the bearing capacity with geocell reinforcement. It is found out that the bearing capacity of geocell-reinforced subgrade gives 2 times higher value than that of unreinforced subgrade soil.

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