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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.
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.
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.
日本語L1幼児および日韓バイリンガル児の授受補助動詞習得についての縦断研究 - 「~テアゲル」と「~テクレル」に焦点を当てて-
迫田亜希子 ( Sakoda Akiko ) 한국일어일문학회 2024 日語日文學硏究 Vol.130 No.0
본고는 일본어L1유아와 한일 이중언어아의 수수보조동사 '~teageru' '~tekureru'에 초점을 맞추어 양자의 token 빈도와 동사를 접하는 type 빈도를 바탕으로 종단적으로 분석하는 것을 목적으로 조사를 실시하였다. 그 결과, 일본어L1유아와 한일 이중언어아의 유사점으로서 '~teageru'이 '~tekureru'보다 token 빈도가 높았던 점'~teageru' '~tekureru'의 비규범적 사용이 3기까지 보인 점, 비규범적 사용은'~teageru'을 사용해야 하는 부분에'~tekureru'를 사용한 것, '~tekureru'을 사용해야 하는 부분에‘~teageru'를 사용한 것이었던점, 규범적 사용 및 비규범적 사용에는 주위의 인풋인 어머니의 발화가 영향을 준점을 들 수 있다. 한편, 한일 이중언어아에서만 볼 수 있었던 특징으로서 3기 이후에 '~tekureru''의 사용이 감소하고, '~teageru'의 비규범적 사용이 증가한 것, 일본어의 수수보조동사의 사용에 한국어의 수수보조동사의 영향이 관찰된 것이 밝혀졌다. This paper focuses on the giving/receiving auxiliary verbs ~teageru and ~ tekureru in Japanese L1 children and Japanese-Korean bilingual children, and conducts a longitudinal analysis based on their token frequency and type frequency preceding the verb. We conducted a survey with this purpose. As a result, similarities between Japanese L1 children and Japanese-Korean bilingual children were that ~teageru had a higher token frequency than ~tekureru and that the non-normative use of~teageru and ~tekureru was observed. Non-normative uses include using~tekureru in a place where ~teageru should be used, and using ~teageru in a place where ~tekureru should be used. In addition, normative and non-normative usage was influenced by the mother's utterances, which were surrounding input. On the other hand, characteristics observed only in Japanese-Korean bilingual children include a decrease in the use of ~tekureru and an increase in the non-normative use of ~teageru after the third period, as well as the influence of Korean giving and receiving auxiliary verbs on the use of Japanese giving and receiving auxiliary verbs.
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.
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.