http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Phthalate Levels in Beverages in Japan and Korea
Yano, K.,Hirosawa, N.,Sakamoto, Y.,Katayama, H.,Moriguchi, T.,Joung, K. E.,Sheen, Y. Y.,Asaoka, K. 梨花女子大學校 藥學硏究所 2002 藥學硏究論文集 Vol.- No.11
Considerable number of endocrine disruptors (7 compounds) are known today (Japan Environmental Agency, 1998). Among them, phthalates are considered to be in most abundance in our environment. The production of phthalates in Japan was 474 thousand tones in 1998 (Kasozai Kogyo Kai, 1999), around 56% of which was di(2-ethylhexyl)phthalate (DEHP) uesd mainly as plasticizers in polyvinyl chloride (PVC) production, is widely used in PVC, nitrocellulose polyvinyl acetate, painting inks, adhesives and lacquers. PVC contains up to 40% phthalates by weight wuthout covalently binding to other ingredients in the PVC(Needham et al., 2000). Thus, significant amounts of DEHP and DBP are easily released from the plastics into the environment during production, used and disposal, resulting in the pollution of food air, water, soil and homes.
N. Katayama,S. Kogoshi 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
One of the present challenges of Polymer electrolyte membrane fuel cells (PEMFCs) is to enhance their durability. It is known that maintaining the load conditions of PEMFCs appropriately could improve the lifetime of PEMFC. We proposed the method of smoothing the output current of PEMFCs by charging or discharging electrical double layer capacitors (EDLCs). To achieve such purpose, we developed a multi-port bidirectional DC-DC converter, which is able to control the energy flow among a fuel cell, EDLC, and load, and to regulate terminal voltages proper to these devices. The aim of this study is to evaluate the frequency characteristics of the proposed hybrid power system. The evaluation contributes to design a long life fuel cell system. The frequency characteristics of the proposed converter system for mitigating PEMFC degradation have been evaluated. To investigate the relationship between the load and the fuel cell currents, frequency response characteristics are measured. The converter can smooth the output current of the fuel cell although the load current fluctuate below 100 ㎐.
H. Obara,M. Katayama,A. Kawamura,J. Xu,N. Shimosato,S. Inoue 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
DC power supplies for a battery testing are becoming significantly important for developments of electrical vehicles (EVs), mobile devices, and renewable energy generations. In the recent decade, modular multi-level converters (MMC) have been actively studied and started to use on some practical applications such as high- or mediumvoltage DC-AC or AC-DC power converters. However, the widely used MMC topology has a significant issue to extend to a DC-DC converter, because it cannot achieve capacitor voltage balancing of each cell unlike the case of the DC-AC and AC-DC conversions. Therefore, most of the MMC-based DC-DC converters are realized by combining the DC-AC converter, isolation transformer or inductor, and AC-DC converter. In this study, the DC-DC operation in the MMC and its problem are analyzed and clarified. This paper proposes a circuit topology and control method of the MMCbased DC-DC converter with cell voltage balancing and fast dynamic response while the DC-AC and AC-DC converters are not used. Simulation results verify the validity of the capacitor voltage balancing control. Finally, an experimental result in a prototype converter with 6-cells using SiCMOSFETs shows the performances of the voltage balancing control and fast dynamic response.
Progress in R&D of coated conductor in M-PACC project
Izumi, T.,Ibi, A.,Nakaoka, K.,Taneda, T.,Yoshida, T.,Takagi, Y.,Nakamura, T.,Machi, T.,Katayama, K.,Sakai, N.,Yoshizumi, M.,Koizumi, T.,Kimura, K.,Kato, T.,Kiss, T.,Shiohara, Y. The Korea Institute of Applied Superconductivity a 2014 한국초전도저온공학회논문지 Vol.16 No.2
The five-year national project in Japan for R&D of coated conductors and applications, named as the Materials and Power Applications of Coated Conductors (M-PACC) project, was finished at the end of FY2013. The project consists of four sub-themes as cable, transformer, SMES and coated conductors. In the theme of coated conductors, the fabrication process had been developed to satisfy the requirements from the applications such as in-field $I_c$ performance, low AC loss in the long tapes etc. Through the project, the remarkable progress was achieved as follows; a high in-field minimum $I_c$ value over 54A/cm-width under 3T at 77K was realized in a 200m long EuBCO tape with artificial pinning centers of $BaHfO_3$ by the pulsed laser deposition (PLD) technique on the IBAD template. On the other hand, the AC loss reduction was confirmed in the tapes fabricated by both PLD and the metal organic deposition (MOD) techniques by scribing 100m tapes into 10-filamments. Additionally, the mechanism of the delamination phenomenon was systematically investigated and the strength was improved by eliminating the origins of the weak points in the films. Through the development, all targeted goals were accomplished and the several results were appreciated as a world champion data.
The Embedment of a Metadata System at Grid Farms at the Belle II Experiment
S. Ahn,J. H. Kim,T. Huh,S. Hwang,조기현,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,T. Uglov,R. Fruhwirth 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.4
In order to search for new physics beyond the standard model, the next generation of B-factory experiment, Belle II will collect a huge data sample that is a challenge for computing systems. The Belle II experiment, which should commence data collection in 2015, expects data rates 50 times greater than that of Belle. In order to handle this amount of data, we need a new data handling system based on a new computing model, which is a distributed computing model including grid farms as opposed to the central computing model using clusters at the Belle experiment. We have constructed a metadata system and embedded the system in the grid farms of the Belle II experiment. We have tested the system using grid farms. Results show good performance in handling such a huge amount of data.
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.