Advances in the understanding of molybdenum effect on iodine and caesium reactivity in condensed phase in the primary circuit in nuclear severe accident conditions

Gouëllo Mélany,Hokkinen Jouni,Kärkelä Teemu 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8

In the case of a severe accident in a Light Water Reactor, the issue of late release of fission products, from the primary circuit surfaces is of particular concern due to the direct impact on the source term. CsI is the main iodine compound present in the primary circuit and can be deposited as particles or condensed species. Its chemistry can be affected by the presence of molybdenum, and can lead to the formation of gaseous iodine. The present work studied chemical reactions on the surfaces involving gaseous iodine release. CsI and MoO3 were used to highlight the effects of carrier gas composition and oxygen partial pressure on the reactions. The results revealed a noticeable effect of the presence of molybdenum on the formation of gaseous iodine, mainly identified as molecular iodine. In addition, the oxygen

Comparison of the cyclic fatigue resistance of One Curve, F6 Skytaper, Protaper Next, and Hyflex CM endodontic files

Gouédard Charlotte,Pino Laurent,Arbab-Chirani Reza,Arbab-Chirani Shabnam,Chevalier Valérie 대한치과보존학회 2022 Restorative Dentistry & Endodontics Vol.47 No.2

Objectives This study compared the cyclic fatigue resistance of One Curve (C wire) and F6 Skytaper (conventional austenite nickel-titanium [NiTi]), and 2 instruments with thermo-mechanically treated NiTi: Protaper Next X2 (M wire) and Hyflex CM (CM wire). Materials and Methods Ten new instruments of each group (size: 0.25 mm, 6% taper in the 3 mm tip region) were tested using a rotary bending machine with a 60° curvature angle and a 5 mm curvature radius, at room temperature. The number of cycles until fracture was recorded. The length of the fractured instruments was measured. The fracture surface of each fragment was examined with a scanning electron microscope (SEM). The data were analyzed using one-way analysis of variance and the post hoc Tukey test. The significance level was set at 0.05. Results At 60°, One Curve, F6 Skytaper and Hyflex CM had significantly longer fatigue lives than Protaper Next X2 (p < 0.05). No statistically significant differences were found in the cyclic fatigue lives of One Curve, F6 Skytaper, and Hyflex CM (p > 0.05). SEM images of the fracture surfaces of the different instruments showed typical features of fatigue failure. Conclusions Within the conditions of this study, at 60° and with a 5 mm curvature radius, the cyclic fatigue life of One Curve was not significantly different from those of F6 Skytaper and Hyflex CM. The cyclic fatigue lives of these 3 instruments were statistically significantly longer than that of Protaper Next. Objectives This study compared the cyclic fatigue resistance of One Curve (C wire) and F6 Skytaper (conventional austenite nickel-titanium [NiTi]), and 2 instruments with thermo-mechanically treated NiTi: Protaper Next X2 (M wire) and Hyflex CM (CM wire). Materials and Methods Ten new instruments of each group (size: 0.25 mm, 6% taper in the 3 mm tip region) were tested using a rotary bending machine with a 60° curvature angle and a 5 mm curvature radius, at room temperature. The number of cycles until fracture was recorded. The length of the fractured instruments was measured. The fracture surface of each fragment was examined with a scanning electron microscope (SEM). The data were analyzed using one-way analysis of variance and the post hoc Tukey test. The significance level was set at 0.05. Results At 60°, One Curve, F6 Skytaper and Hyflex CM had significantly longer fatigue lives than Protaper Next X2 (p < 0.05). No statistically significant differences were found in the cyclic fatigue lives of One Curve, F6 Skytaper, and Hyflex CM (p > 0.05). SEM images of the fracture surfaces of the different instruments showed typical features of fatigue failure. Conclusions Within the conditions of this study, at 60° and with a 5 mm curvature radius, the cyclic fatigue life of One Curve was not significantly different from those of F6 Skytaper and Hyflex CM. The cyclic fatigue lives of these 3 instruments were statistically significantly longer than that of Protaper Next.

政治社會化와 그 內容

李球載 서울 敎育大學校 1977 論文集 Vol.10 No.-

國家觀 確立을 위한 敎育에서 考慮되어야 할 몇 가지 問題點

球 載 서울 敎育大學校 1976 論文集 Vol.9 No.-

웹기반 구조중심 협동학습 시스템의 설계 및 구현

정규옥,양형정,최숙영 한국컴퓨터교육학회 2004 컴퓨터교육학회 논문지 Vol.7 No.3

협동학습 모델 중에서 매우 간단하고 적용이 쉬운 구조중심 협동학습은 다양한 구조의 유기적 연결과 학습내용의 결합을 통해 교수학습이 이루어진다. 본 연구에서는 이러한 구조중심의 협동학습을 위한 교수-학습 모델을 제안하고, 이를 지원하는 웹기반 구조중심 협동학습 시스템을 설계 및 구현하였다. 본 연구에서 제안하는 구조중심 협동학습 모델에서는 교과학습에 적용할 수 있는 구체적인 틀을 제시하여 협동학습을 효과적으로 지원할 수 있도록 하였다. 또한 학습 내용과 형태에 따라 다른 구조를 적용할 수 있도록 지식 습득형, 탐구형, 기능 숙달형 구조로 분류하고 이에 따른 적용 모형들을 제시하고 있다. 이러한 모형들을 기반으로 실제 협동학습을 수행할 수 있도록 시스템을 구현하여, 수업에 적용한 후 그 효과를 분석해 보았다. One of the cooperative learning models, the cooperative learning of structural approach which is very simple and easily applicable accomplishes teaching-learning through combining learning contents and organic connections of various structures. This work proposes a cooperative teaching-learning model for the structural approach, designs and implements a web-based cooperative system supporting it. The model provides a concrete frame which can apply to a subject learning thus could effectively support cooperative learning. Furthermore, it classifies learning into three types such as knowledge learning, investigation, and function mastering and presents a structure application model for each so as to apply different structures according to learning materials and types. We implemented a system that performs cooperative learning on the basis of these models, applied to a class, and analyzed the effect of it.

Use of Denaturing High-Performance Liquid Chromatography (DHPLC) to Characterize the Bacterial and Fungal Airway Microbiota of Cystic Fibrosis Patients

Jérôme Mounier,Geneviève Héry-Arnaud,Audrey Gouëllo,Marlène Keravec,Solène Le Gal,Grégory Pacini,Stella Debaets,Gilles Nevez,Gilles Rault,Georges Barbier 한국미생물학회 2014 The journal of microbiology Vol.52 No.4

The aim of this study was to evaluate the use of denaturinghigh-performance liquid chromatography (DHPLC) to characterizecystic fibrosis (CF) airway microbiota includingboth bacteria and fungi. DHPLC conditions were first optimizedusing a mixture of V6, V7 and V8 region 16S rRNAgene PCR amplicons from 18 bacterial species commonlyfound in CF patients. Then, the microbial diversity of 4 sputumsamples from 4 CF patients was analyzed using culturalmethods, cloning/sequencing (for bacteria only) and DHPLCpeak fraction collection/sequencing. DHPLC analysis allowedidentifying more bacterial and fungal species than the classicalculture methods, including well-recognized pathogenssuch as Pseudomonas aeruginosa. Even if a lower number ofbacterial Operational Taxonomic Units (OTUs) was identifiedby DHPLC, it allowed to find OTUs unidentified bycloning/sequencing. The combination of both techniquespermitted to correlate the majority of DHPLC peaks to definedOTUs. Finally, although Aspergillus fumigatus detectionusing DHPLC can still be improved, this techniqueclearly allowed to identify a higher number of fungal speciesversus classical culture-based methods. To conclude, DHPLCprovided meaningful additional data concerning pathogenicbacteria and fungi as well as fastidious microorganisms presentwithin the CF respiratory tract. DHPLC can be consideredas a complementary technique to culture-dependentanalyses in routine microbiological laboratories.

Dryland agricultural environment and sustainable productivity

Gou-Xia Li,Bing-Cheng Xu,Li-Na Yin,Shi-Wen Wang,Sui-Qi Zhang,Lun Shan,곽상수,Qingbo Ke,Xi-Ping Deng 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.2

Global climate change is expected to cause progressively increased frequency and severity of drought events, which further seriously limit plant growth and crop yields. Increasing water use effi ciency (WUE) and yield per unit rainfall are one of the most important challenges in dry land agriculture. Here, we reviewed the comprehensive technical strategies including conserving water to combine both increased agricultural productivity and resource conservation; enquiring into how crop plants respond to drought through morphological, physiological, and molecular modifi cations that occur in all plant organs; breeding for drought tolerance where there is a delineated stress environment and genotype × environment interactions are stable; eff ective conservation of rainfall and high effi ciency of use. In addition, we discussed the preponderance of biological water-saving measures, which embraces improvements in WUE and drought tolerance, by genetic improvement and physiological regulation. Sustainable agriculture would be benefi ted from modern engineering such as biological engineering, conservation tillage, and breeding technologies.

Organotypic Angiogenesis and Vascular Remodeling

Gou Young Koh,LVBSC members 한국실험동물학회 2014 한국실험동물학회 학술발표대회 논문집 Vol.2014 No.8

The Dao Theory of Life View of Confucian Philosophy

( Gou Xiaoquan ) 성균관대학교 유교문화연구소 2012 儒敎文化硏究(中文版) Vol.0 No.17

儒家的生命觀, 尤其是尊重生命的思想傳統, 有着非常深刻的本體論根源。儒家哲學非常注重“道”對于人的意義和价値, 但在如何實現“道”的過程中, 儒家哲學賦予了通過主體之“德”(也就是“得”)的途徑以決定性的意義, 也就是孔子所言的“道之以德”。在儒家哲學看來, “德”總是與某種根本性、根源性、无限性、終極性的“生”的存在意義聯系在一起, 由此決定了儒家哲學把生命與“道德”視爲一致, 認爲尊重生命就是實現“道德”的一個重要根据或前提。儒家之尊重生命, 認爲生命可貴, 從本體論層面看, 就是由于生命是一種根源性、根本性、无限性、終極性的存在, 尊重生命就是維護、保持這種根源性、根本性、无限性和終極性, 從而才能實現“道德”。生命與“道德”的一致性是儒家生命觀的主要特征, 其旣涵有自然意義上的生命義, 又具有根源、根本、无限與終極意義上的“道德”義, 由此決定了生命與“道德”的統一性;失去或喪失這種統一性, 人便會具有獸性, 從而引發人類的生存危机。 A life view of Confucian philosophy, especially thinking of respecting life, has very profound the Dao Theory. the Confucianists believe the “influence of Dao”, but in practice , they put more emphasis on subject’s De. Because Confucianists think, Dao cannot exist by being itself independent of losing subject’s De. In another word, that is Confucius’s “Dao zhi yi De”. Confucian philosophy thinks that De always relates root, fundamentality, infiniteness and ultimateness of creativity, and determines a uniform relationship between life and dao-de. Respecting life could be helpful in achieving dao-de. [Article in Chinese]

The Trait of Daoism of Confucian Philosophy

( Gou Xiaoqian ) 성균관대학교 유교문화연구소 2011 儒敎文化硏究(中文版) Vol.0 No.15

在儒家哲學本體論中, “本體”槪念具有極其豊富的內涵, 其不僅指向世界最根本、最根源的存在, 同時也揭示事物本身、本來的存在樣態, 與西方哲學“是論”或“存在論”(Ontology)具有相關之處, 但又有一定差異。對儒家哲學本體論的硏究的實質, 是在于探尋一種核心理論形態。 In Daoism of Confucian Philosophy, Dao includes profuse connotation, which concerns with not only the most basic and the original Existing, but also revealing Things itself. Compare with Ontology, Daoism of Confucian Philosophy has its its own characteristics, that Dao means the Whole, not alike Being Essence. Finally, Daoism of ConfucianPhilosophy manifested as a core theoretical formation. [Article in Chinese]