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Contamination and Bioconcentration of Perfluorinated Compounds in Main River Ecosystems of Korea
N. H. Lam,C.R. Cho,M.S. Chang,B.C. Lee,P.J. Kim,K. Sasaki,H.S. Cho 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.11
Water, sediment, plankton, blood and liver of crucian carp (Carassius carassius) and mandarin fish (Siniperca cherzeri) samples from 5 freshwater ecosystems in 3 major rivers of Korea including Nam Han River, Nakdong River and Yeongsan River were collected together with medaka fish (Oryzias latipes) and water in their 5 natural habitats. The samples were analyzed to determine the occurrence and contamination level of perfluorinated compounds (PFCs). The mean total concentration of detected PFCs was in the ascending order of water, sediment, plankton, crucian carp and mandarin fish. Longchain PFCs (≥C8) was widely detected and occupied 99.32% of total PFCs concentration. Perfluorooctane sulfonate (PFOS) was the dominant PFC in most of the ecosystem components with a maximum concentration in water of 6.25 ng/L and in fish of 273 ng/g wet wt. The results also demonstrated that concentration of PFOS and total PFCs in blood of crucian carp and mandarin fish were higher than those in their liver. PFOS concentrations detected in water samples were lower than the water quality criteria values for aquatic organisms protection, which were reported in Giesy et al., 2010. A positive linear regression (r²=0.99, p<0.05) and a trophic magnification factor of 28.25 were observed between PFOS concentrations and trophic levels of collected biota. The mean bioconcentration factor (BCF) of PFOS were extended from 14,745±21,366 (in plankton) to 517,476±705,036 (in crucian carp blood). According to the method of Moermond et al., 2010 and the received BCF of sensitive medaka fish in this study, we suggested the MPCsp,water of 0.083 ng/L for PFOS in Korea freshwater ecosystems.
Design of the Advanced Metadata Service System with AMGA for the Belle II Experiment
S. Ahn,K. Cho,S. Hwang,J. Kim,H. Jang,B. K. Kim,H. Yoon,J. Yu,Z. Drasal,T. Hara,Y. Iida,R. Itoh,G. Iwai,N. Katayama,Y. Kawai,S. Nishida,T. Sasaki,Y. Watase,R. Fruhwirth,W. Mitaroff,R. Grzymkowski,M. S 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.4
The Belle II experiment is expected to produce 50 times more data than the existing Belle experiment. Such huge data production requires not only scalability with respect to the storage service but also scalability regarding the metadata service. There has already been a metadata service at the Belle experiment, but it is not proper for the Belle II experiment because it has scalability problems and it is not intended to be used in a distributed grid environment. To deal with these issues, we designed an advanced metadata service system based on AMGA, which provides efficient and scalable metadata searching. We have built testbed sites to test the correctness, performance and scalability of the advanced metadata service system, and it has been proved to be able to provide efficient metadata searching for the Belle II experiment.
Janus structured Pt-FeNC nanoparticles as a catalyst for the oxygen reduction reaction
Kuttiyiel, K.,Sasaki, K.,Park, G. G.,Vukmirovic, M.,Wu, L.,Zhu, Y.,Chen, J.,Adzic, R. Royal Society of Chemistry 2017 Chemical communications Vol.53 No.10
<P>We present a new Janus structured catalyst consisting of Pt nano-particles on Fe-N-C nanoparticles encapsulated by graphene layers for the ORR. The ORR activity of the catalyst increases under potential cycling as the unique Janus nanostructure is further bonded due to a synergetic effect. The present study describes an important advanced approach for the future design of efficient, stable, and low-cost Pt-based electrocatalytic systems.</P>
BODY HEAT CONTENT, HEAT PRODUCTION AND RESPIRATION IN SHEEP EXPOSED TO INTERMITTENT COLD
Lee, S.R.,Sasaki, Y. Asian Australasian Association of Animal Productio 1994 Animal Bioscience Vol.7 No.3
Five adult sheep were exposed to intermittent cold for 12 h (18:00-06:00) at an air temperature of $5{\pm}1^{\circ}C$ followed by 12 h (06:00-18:00) at $25{\pm}2^{\circ}C$ over a period of 8 days continuously. Carotid artery blood (Tc), mean skin (Ts) and mean body (Tb = 0.86 Tc + 0.14 Ts) temperatures, heat production rate (HP), respiratory evaporative heat loss, respiration rate (RR) and volume were measured before and after exposure. Tc during the 12 h cold period of intermittent cold exposure was similar to that during the corresponding period in the warm environment, while Tc in the $25^{\circ}C$ of intermittent cold was higher (p < 0.05) than that in the corresponding period in the warm environment. Ts during the cold period markedly decreased (p < 0.001) by about $9^{\circ}C$ when compared with that in the corresponding time period in the warm environment, while Ts during the $25^{\circ}C$ period of intermittent cold recovered to a similar level to that in the warm environment. Tb was lower (p < 0.001) during the cold period of intermittent cold, whereas a slight increase in Tb during the $25^{\circ}C$ period of intermittent cold was significant (p < 0.05) when compared with the value during the similar period in the warm environment. HP was greatly increased (p < 0.001) by cold exposure, followed by an immediate decrease during the first one hour of the 12 h warm period, reaching a similar level to that in the warm environment. A lower (p < 0.05) RR was observed during both the cold and $25^{\circ}C$ period of intermittent cold than during the corresponding periods in the warm environment. The results of the present investigation clearly show that the body temperature of sheep increased during a 12 h warm period following 12 h of exposure to cold. These results suggest that during a warm period of an intermittent cold exposure cycle, heat could be shored in the animal body.
Budovsky, I.,Abidin, A.R.B.Z.,Yan, A.Y.K.,Liu, LingXiang,Rustagi, V.K.,Govil, A.K.,Klonz, M.,Wei, Yih-cheng,Early, M.D.,Sasaki, H.,Fujiki, H.,Kumtawee, C.,Charoensook, A.,Kwon, Sung-Won,Son, N.A.,Supr IEEE 2005 IEEE transactions on instrumentation and measureme Vol.54 No.2
This paper presents preliminary results of the APMP.EM-K6a key comparison of AC-DC transfer conducted during 2000 to 2003. The AC-DC voltage transfer difference of the travelling standard was measured at 3 V and selected frequencies from 1 kHz to 1 MHz that included those of the CCEM-K6a key comparison. Also discussed are the methods used to compare thermal voltage converters with different input connectors, and to link the results to the parent Consultative Committee on Electricity and Magnetism (CCEM) comparison.