• Title/Summary/Keyword: Durand

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Dental biomaterials for chairside CAD/CAM: State of the art

  • Lambert, Hugo;Durand, Jean-Cedric;Jacquot, Bruno;Fages, Michel
    • The Journal of Advanced Prosthodontics
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    • v.9 no.6
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    • pp.486-495
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    • 2017
  • The wide use of chairside CAD/CAM restorations has increased the diversity of the restorative material. For the practitioner, the selection of the appropriate material is difficult amongst the variety offered by the market. Information on the characteristics of the products can be difficult to assess due to the lack of up-to-date classification and the lack of reliability of manufacturer's advertising. The purpose of this article is to structure the data on restorative materials provided by various sources in order for the practitioner to choose the product most suited to the clinical situation. The objective is to classify chairside CAD/CAM materials and to define their characteristics and indications.

The Contribution of Molecular Physiology to the Improvement of Nitrogen Use Efficiency in Crops

  • Hirel, Bertrand;Chardon, Fabien;Durand, Jacques
    • Journal of Crop Science and Biotechnology
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    • v.10 no.3
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    • pp.123-132
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    • 2007
  • In this review, we discuss the ways in which our understanding of the controls of nitrogen use efficiency applied to crop improvement has been increased through the development of molecular physiology studies using transgenic plants or mutants with modified capacities for nitrogen uptake, assimilation and recycling. More recently, exploiting crop genetic variability through quantitative trait loci and candidate gene detection has opened new perspectives toward the identification of key structural or regulatory elements involved in the control of nitrogen metabolism for improving crop productivity. All together these studies strongly suggest that in the near future nitrogen use efficiency can be improved both by marker-assisted selection and genetic engineering, thus having the most promise for the practical application of increasing the capacity of a wide range of economically important species to take up and utilize nitrogen more efficiently.

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A study of the history of western imagination (서구 상상력의 역사 연구)

  • Hong, Myung-Hee
    • Cross-Cultural Studies
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    • v.29
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    • pp.113-131
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    • 2012
  • In our days, we live in the world of image and imagination. Now we think that the images and imaginations are no more selective but indispensable elements in our life. The status of imagination is dramatically changed since 20 century. Many philosophers like G. Bachelard, G. Durand, Paul Ricoeur, H. Corbin, G. Deleuze made great contributions and we think that the studies of imagination began since 20 century. But the change of the status of imagination was not made in one day. In the long history of human life, the imagination kept his own value, and never stopped to give his influence to the human mentalities. The concept of imagination was born from the Plato's notion of phantasia. Plato thinks that the phantasia is a kind of drawing capacity in mind in the process of recognition. But the image which phantasia makes is not real one but pseudo one. So it is necessary to banish those false images from our recognition. Aristotle thought phantasia as an afterimage of object of sense. The sense is always true, but the phantasia is very possible to be an error. After Plato and Aristotle, the notion of phantasia developed into that of imagination, but it was always a problem full of contradictions. According to G. Durand, we can say, in some sense, the history of western philosophy is a kind of struggle against the image and imagination. In Middle Age, the iconoclasm tried to exclude image from their religion. Thomas Aquinas tried to explain the image by the rationalistic christianisme. In 16-17C Galilei and Descartes solidified the exclusion of imagination from the philosophy in the name of science and reason. The empiricism and positivism was the final and the most conclusive philosophies which exclude the imagination definitively from the field of philosophy. But the imagination continued his influence in the field of art. In the age of Renaissance, the imagination found his way of liberal expression, and this trend was inherited to Baroque. From the middle of 17c many philosophical theories supported the imagination by many philosophers like J.-B. Dubos, Baumgarten, A. Becq, J.-J. Rousseau etc. The Romanticism was the first significant wave which made the imagination come forward in front the art. The romanticism broke the narrow frame of rationalism and expand human's view of the world to the cosmos. From the romanticism, the imagination became a faculty which expresses the unity of human and nature. That was impossible by the rational thinking of rationalism. The concept of new imagination made a new future of human, 'the imagining conscious' and this imagining conscious provided a solid base of next generation's symbolism and surrealism.

Japanese Mythic Imaginaries and the Symbolic Structure of Traditional Space Designs (일본의 신화적 상상계와 전통공간디자인의 상징적 구조)

  • Park, Kyung-Ae
    • Korean Institute of Interior Design Journal
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    • v.24 no.3
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    • pp.79-86
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    • 2015
  • Myths and architectural spaces are cultural products symbolizing ideologies and objects respectively. Myth has the structure and the contents of a unique view of the world that reflects thoughts and representations of the nationalities. This study is about 'the spaces of the memory' adapted by the mythic tradition among many aspects of the Japanese tradition. The process of this study is illustrated as follows: At first, it mentions the concept of Gilbert Durand's mythic imaginaries and prototype with the method on how the myth is applied to the architectural spaces in the cultural context. Secondly, It clarifies basic meaning arrangement of the Japanese traditional spaces related to the myth. It shows sourceful 'prototipical system' that lies in the relation between thoughts and representations, regarding the shinto's spaces in terms of mythical imaginaries and Japanness. Thirdly, it ascertains mythical structure represented in the traditional space designs on terms with 'prototype' from symbolic system of the myth. It selects the cases among Japanese contemporary architects's works designed after 1960's, and analyses the meanings. In conclusion, it clarifies that this way can be a suggestion as the space design method combining the human's imaginary property with the time-stratigraphic region, and offering creative ideas for the strategy of the space design brand image that embraces a wide range of culture, ecology, and sensibility.

Bioproduction and Anticancer Activity of Biosurfactant Produced by the Dematiaceous Fungus Exophiala dermatitidis SK80

  • Chiewpattanakul, Paramaporn;Phonnok, Sirinet;Durand, Alain;Marie, Emmanuelle;Thanomsub, Benjamas Wongsatayanon
    • Journal of Microbiology and Biotechnology
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    • v.20 no.12
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    • pp.1664-1671
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    • 2010
  • A new biosurfactant producer was isolated from palm-oil-contaminated soil and later identified through morphology and DNA sequencing as the yeast-like fungus Exophiala dermatitidis. Biosurfactant production was catalyzed by vegetable oil, supplemented with a basal medium. The culture conditions that provided the biosurfactant with the highest surface activity were found to be 5% palm oil with 0.08% $NH_4NO_3$, at a pH of 5.3, with shaking at 200 rpm, and a temperature of $30^{\circ}C$ for a 14-day period of incubation. The biosurfactant was purified, in accordance with surfactant properties, by solvent fractionation using silica gel column chromatography. The chemical structure of the strongest surface-active compound was elucidated through the use of NMR and mass spectroscopy, and noted to be monoolein, which then went on to demonstrate antiproliferative activity against cervical cancer (HeLa) and leukemia (U937) cell lines in a dose-dependent manner. Interestingly, no cytotoxicity was observed with normal cells even when high concentrations were used. Cell and DNA morphological changes, in both cancer cell lines, were observed to be cell shrinkage, membrane blebbling, and DNA fragmentation.

A Study on the Initial Hull Form Design by Using Form Parameters (형상계수에 의한 초기선형설계에 관한 연구)

  • Dong-Joon Kim
    • Journal of the Society of Naval Architects of Korea
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    • v.30 no.2
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    • pp.24-29
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    • 1993
  • This paper describes a method for generating an initial hull form by using form parameters. As a mathematical representation of curves, B-spline curves are used as well as the polynomials used by Durand et al. The five basic control curves and the centerline contour are defined to give the boundary conditions for body plan by using above mentioned mathematical models. From these curves body plan is determined. Two additional curves which are concerned the position of matching point between the cylindrical form and the water line are proposed to get the preliminary faired water lines.

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Batch and dynamic study of lactic acid extraction using emulsion liquid membrane

  • Berrama, Tarek;Pareau, Dominique;Durand, Gerard
    • Membrane and Water Treatment
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    • v.6 no.4
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    • pp.277-292
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    • 2015
  • The extraction of lactic acid by an emulsion liquid membrane (ELM), in batch and continuous mode, has been reported. On the basis of preliminary experiments, the optimum composition of the organic phase (membrane) is determined. When the SPan 80 is used as surfactant, the emulsion breakage exceeds 50%, but only 10% is obtained when the ECA4360 is used. The effects of surfactant, carrier and solute concentrations, phase volume ratio, and stirring speed on the extraction yield were examined and optimized. Surfactant, carrier and diluent used were ECA4360, trilaurylamine (TLA) and dodecane, respectively; 2-ethylhexane-1,3-diol (EHD) is used as a co-surfactant. Under optimal conditions, emulsion breaking is very low and the swelling is kept at its lowest level. Under the pH conditions of fermentation medium, the extraction yield is lower. A mixer-settler continuous system was used for testing these conditions. The residence time, the number of extraction stages and the stability of the emulsion were studied and optimized. The extraction yield obtained exceeds 90%.

Comparing pain relief and functional improvement between methylprednisolone and dexamethasone lumbosacral transforaminal epidural steroid injections: a self-controlled study

  • Donohue, Nicholas K.;Tarima, Sergey S.;Durand, Matthew J.;Wu, Hong
    • The Korean Journal of Pain
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    • v.33 no.2
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    • pp.192-198
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    • 2020
  • Background: Previous studies have shown varying results between lumbosacral transforaminal epidural steroid injections (TFESIs) performed with particulate versus non-particulate corticosteroids. The purpose of this study was to investigate the difference in pain relief and functional improvement between particulate and nonparticulate lumbosacral TFESIs in patients who had undergone both injections, sequentially. Methods: This was a self-controlled, retrospective study of 20 patients who underwent both a methylprednisolone and a dexamethasone TFESI to the same vertebral level and side. Primary outcomes included pain relief according to the visual analogue scale (VAS) and functional improvement determined by a yes/no answer to questions regarding mobility and the activities of daily living. Post-injection data was recorded at 2, 3, and 6 months. Results: A decrease in VAS scores of -3.4 ± 3.0 (mean ± standard deviation), -3.1 ± 3.1, and -2.8 ± 3.4 was seen for the methylprednisolone group at 2, 3, and 6 months, respectively. Similar decreases of -3.9 ± 3.5, -3.4 ± 2.8, and -2.3 ± 3.4 were seen in the dexamethasone group. There was no significant difference in pain relief at any point between the two medications. The percentage of subjects who reported improved function at 2, 3, and 6 months was 65%, 51%, and 41%, respectively, for the methylprednisolone group and 75%, 53%, and 42% for the dexamethasone group. Conclusions: These findings support the use of non-particulate corticosteroids for lumbosacral TFESIs in the context of documented safety concerns with particulate corticosteroids.

Rationalist Approach Towards New Forms : White Prisms (새로운 형태, 백색 프리즘에 대한 이성적 접근에 관한 연구)

  • Chung, Jin Soo
    • Journal of architectural history
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    • v.3 no.1
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    • pp.161-172
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    • 1994
  • This is part of a study on the origin of modernist forms and settings. Forms in Modern Architecture are totally new as though they seemed to be originated from some remote culture. Archaeological studies and Laugier's primitivist attitude to the classical architecture provided a way leading, in the end, to pure structures and abstract forms. An application of the classical elements was combined with the ultimate image of nobility, simplicity and rationality. What the seventeenth and eighteenth century theorists realized in the ruines of the classical structures were not the ones with their original organic vitality but the deteriorated, naked and abstracted ones. The essence of the classical structures has been the one of the main references of the modern white architecture. Ration and Nature were the quintessential terms in the design process of the Enlightenment architects of the late eighteenth and nineteenth centuries as they were in the twentieth century architecture. Pure geometric and symbolic forms were new inventions for the new revolutionary age after the development of architectural Styles, successive until Baroque and Roccoco, ceased to go on to the next phase. Many of their buildings appeared so modem in character, for they were omitted all but the essential structure and decoration. Other sides of rationality in the pre-modern age were evolved in terms of the paradigmatic research and the logic in structure. Durand developed a systematic typological approach to the forms. Geometry was the basis of his designs and his illustrations resembled endless simple geometrical problems. One of the other rational approaches was mainly developed by Viollet-le-Duc. To him, Gothic architecture was the model in which each members functioned actively and exerted counterpressure and the Middle Ages invented new fantastic forms. The several ways of rational approaches in architecture were led to the 'tabula rasa' planning in modern architecture. Nature was remained untouched and not deformed as Ledoux's houses in the $H{\hat{o}}tel$ de $Th{\acute{e}}lusson$ were setted on informal gardens. It is part of the modem image that Nature flows or interpenetrates through the white prisms of the strictest classical purity and machines.

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Mindfulness-based Practices in Workers to Address Mental Health Conditions: A Systematic Review

  • Quentin Durand-Moreau;Tanya Jackson;Danika Deibert;Charl Els;Janice Y. Kung;Sebastian Straube
    • Safety and Health at Work
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    • v.14 no.3
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    • pp.250-258
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    • 2023
  • The effectiveness of mindfulness techniques in addressing mental health conditions in workers is uncertain. However, it could represent a therapeutic tool for workers presenting with such conditions. Our objective was to assess the effects of mindfulness-based practices for workers diagnosed with mental health conditions. We conducted a systematic review of randomized controlled trials. Participants included were workers with a mental health condition. Interventions included any mindfulness technique, compared to any nonmindfulness interventions. Outcomes were scores on validated psychiatric rating scales. A total of 4,407 records were screened; 202 were included for full-text analysis; 2 studies were included. The first study (Finnes et al., 2017) used Acceptance and Commitment Therapy (ACT) associated or not with Workplace Dialogue Intervention (WDI), compared to treatment as usual. At 9 months follow-up, for the ACT group, depression scores improved marginally (standardized mean difference [SMD]: -0.06, p = 0.021), but anxiety scores were worse (SMD: 0.15, p = 0.036). Changes in mental health outcomes were not statistically significant for the ACT + WDI group. In the second study (Grensman et al., 2018), no statistically significant change in mental health scales has been observed after completion of mindfulness-based cognitive therapy compared to cognitive behavioral therapy. Substantial heterogeneity precluded meta-analysis. This systematic review did not find evidence that mindfulness-based practices provide a durable and substantial improvement of mental health outcomes in workers diagnosed with mental health conditions.