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Sakoda, Tatsuya,Sung, Youl-Moon The Korean Institute of Electrical Engineers 2004 KIEE International Transactions on Electrophysics Vol.4C No.5
In order to investigate the optimum conditions for the effective ozone formation in a dielectric barrier discharge, measurements of ozone concentration were carried out for various conditions such as the gap length, the dielectric material and the operating gas. It was found that the optimum discharge conditions differed exceedingly in the types of operating gases and dielectric materials. In dry air, dielectric material with low dielectric constant and thermal conductivity, which might contribute to the restriction of the gas temperature rise in the discharge region, proved effective in obtaining both high ozone yield and concentration. The optimum gap length was considered to be in the range of 600-800 mm. In oxygen, using a quartz glass disk as a dielectric material, the required condition to obtain the high ozone yield and concentration was expanded.
An attempt to organize bioassays' data of various chemicals
Sakoda, Akiyoshi,Shoji, Ryo,Sakai, Yasuyuki,Suzuki, Motoyuki,Utsumi, Hideo 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1
Abstract Environmental waters such as river and lake waters are most likely polluted by a numerous number of chemicals produced and emitted by human activities nowadays. Bioassays are considered to be rational methodologies for evaluating their toxicities against human beings and ecosystems. The various kinds of bioassays data for chemicals have been accumulated so far in the literature. Organizing bioassays data of various chemicals was tried in this work in order to make use of those data much more effectively and practically for the toxicity control and management of environmental waters. Environmental waters such as river and lake waters are most likely polluted by a numerous number of chemicals produced and emitted by human activities nowadays. Bioassays are considered to be rational methodologies for evaluating their toxicities against human beings and ecosystems. The various kinds of bioassays data for chemicals have been accumulated so far in the literature. Organizing bioassays data of various chemicals was tried in this work in order to make use of those data much more effectively and practically for the toxicity control and management of environmental waters.
Sakoda, Akiyoshi,Wang, Jianzhong,Fujii, Takao,Suzuki, Motoyuki 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.14 No.2
When biological activated carbon (BAC) treatment is applied to the drinking water treatment, trihalomethane formation potential (THMFP) should be controlled to satisfy the water quality regulations. However, since the behavior of THM precursors in BAC is not clarified yet, the effluent THMFP is not guaranteed to be low enough. In this work, adsorption and biodegradation properties of trihalomethane precursors met in BAC treatment were experimentally investigated, which were the biochemicals produced by bacterial growth and autolysis taking place during the BAG treatment. It has become clear that the effluent THMFP is controlled by autolysis by-products with higher adsorbability and very low biodegradability.
Monitoring Water Quality of Environmental Waters by Bioassays
Akiyoshi, Sakoda,Ryo, Shoji,Yasuyuki, Sakai,Motoyuki, Suzuki 영남대학교 환경문제연구소 2000 環境硏究 Vol.19 No.2
Environmental waters such as river and lake waters in Japan are often deteriorated by various kinds of trace and unidentified chemicals despite of the recent development of sewage systems and wastewater treatment technologies. This situation appears to become worse and worse. In addition to the contamination by particular toxicants, complex toxicity due to multi-component chemicals could be much more serious. Bioassays are toxicity tests of chemicals and pharmaceuticals by using living animal bodies, organs, cells and so on, and have been intensively utilized in pharmacology so far. The situation mentioned above have led us to apply bioassays far monitoring water quality of environmental waters by expressing the direct and potential toxicity to human beings and ecosystems instead of concentrations of particular chemicals. However, the problems encountered involve the fact that bioassays for pharmaceutical purposes in general need complicated, time-consuming and expert procedures. Also, a methodology to feed back the resultant toxicity data to water environment management is not establishcd yet. For this purpose, we have developed a novel bioassay methodology based on the fluorescein isothiocyanate-labelled low-density lipopntein (FITC-LDL) uptaking activity of human hepatoblastoma Hep G2 cells. The new method enabled us to detect the toxicity of environmental waters such as river water directly within 2 hours of exposure without concentrating water samples. This is significantly quick and easy as compared to conventional cell survival bioassays. The toxicity data for 255 selected chemicals sod environmental waters obtained by this method were organized by a mathematical equation in order to make use of those data much more effectively and practically to the management of environmental waters. The mathematical description of complex toxicity found for mixtures was proposed and demonstrated. As model cases of our methodology, some approaches to reduce the toxicity actually delected in a river water were proposed. Our methodology would be one of the promising examples of applying bioassays for monitoring environmental water quality and of suggesting a solution of toxicity problem encountered.
The IRPA Young Generation Network: Activity Report from the Middle of 2018 to the Beginning of 2021
Andresz, Sylvain,Sakoda, Akihiro,Ha, Wi-Ho,Kabrt, Franz,Kono, Takahiko,Munoz, Marina Saez,Nusrat, Omar,Papp, Cinthia,Qiu, Rui,Bryant, Pete The Korean Association for Radiation Protection 2021 방사선방어학회지 Vol.46 No.3
Since its establishment in 2018, the Young Generation Network (YGN) has been dedicated, with support of the International Radiation Protection Association (IRPA), to a variety of activities to promote communication, collaboration and professional development of students and young professionals in the area of radiation protection and its allied fields. This article reports our recent activities from the middle of 2018 to the beginning of 2021, with highlights on some important events: "Joint JHPS-SRP-KARP Workshop of Young Generation Network" (December 2019 in Japan); contribution to "Nuclear Energy Agency Workshop on Optimization: Rethinking the Art of Reasonable" (January 2020 in Portugal); survey on the impact of coronavirus disease 2019 (COVID-19) on radiation protection among IRPA YGN members (March 2020); and contribution to IRPA15 (15<sup>th</sup> International Congress of the IRPA; January-February 2021, online). The discussion and insight obtained from each activity are also summarized. The IRPA YGN will aim to achieve its on-going activities and continue to follow the ways paved in the Strategic Agenda and despite the challenges raised by the COVID-19 pandemic. Namely, running an international survey (for example, on the usage of social media in radiation protection, and on the long-term consequences of the COVID-19 pandemic), engaging national YGNs, extending the network, finding new relationships with networks with an interest in the young generation and participation in (remote) events will be aspired for.
DC-DC converter current measurement for MPPT control
Noriyuki Kimura,Yoshinori Sakoda,Toshimitsu Morizane 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents the possibility to use the MOS-FET as the current measuring resistance. The shunt resistance is often used to measure the current in power electronics circuit since it is low cost and high reliable. However the reduction of components is always desirable for reduction of the cost and high reliability. Maximum power point tracking is indispensable for the renewable energy source, though the precise measurement of the power is not necessary. So the authors propose to use the MOS-FET switching device installed in the dc-dc converter circuit as the current measuring resistance. Simulation and experimental results of the first stage investigation are shown.
Matching Diffuser Vane with Return Vane Installed in Multistage Centrifugal Pump
Kawashima, Daisuke,Kanemoto, Toshiaki,Sakoda, Kazuyuki,Wada, Akihiro,Hara, Takashi Korean Society for Fluid machinery 2008 International journal of fluid machinery and syste Vol.1 No.1
The effects of the diffuser vane on the performances of the multistage centrifugal pump were investigated experimentally, taking account of the interactions among the diffuser vane, the return vane, and the next stage impeller. It is very important to match well the diffuser vane with the return vane, for improving the hydraulic efficiency of the pump. The efficiency may be more improved by making the cross-sectional area of the channel from the diffuser vane outlet to the return vane inlet larger, as much as possible.