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RISS 인기검색어
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- 저자 : Egon (검색결과 11 건)
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Advances in the Field of Thermal Procedures in Direct Combination with Thin-layer Chromatography
Egon Stahl 한국생약학회 1976 생약학회지 Vol.7 No.1
The hitherto existing gap in the field of chromatographic methods has been filled by the direct coupling of a suitable oven (TAS-oven) with TLC. The sample to be examined is heated either isothermally or linearly within the temperature gradient of 50∼450℃. The volatile and/or thermolytically evolved substances are fractionated on the TLC-layer and subsequently chromatographed under standard conditions. Transport mechanisms from the sample to the TLC-layer, applications of the TAS-procedure and further developments are discussed. Thermofractography, developed from the TAS-procedure, is demonstrated on different groups of natural substances such as alkaloids, amino acids, nucleic acids. nucleosides, nucleotides, triglycerides and other lipids, pyrone glycosides and aglycon. Experimental work and results on the thermolysis of macromolecular natural and synthetic substances, natural polyphenols, tanning agents and leather and the possibilities of differentiating various lignins, carbohydrate and synthetic polymers are reported. Further, it is shown that classical reactions in the microgram range, e.g. zinc dust distillation, sulphur-and selenium dehydrogenation and catalytic dehydrogenation, can be coupled directly with TLC. Also described is a method which allows to investigate the gaseous compounds evolved during thermofractography in the range of up to 450℃. Thermal procedures coupled with TLC open up the following new possibilities for chemical microanalysis: fractionated separation of distillable and sublimable components, fractionated thermolysis and carrying out of thermal reactions in the ultra micro range.
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Car style-holon recognition in computer-aided design
Egon Ostrosi,Jean-Bernard Bluntzer,Zaifang Zhang,Josip Stjepandic´ 한국CDE학회 2019 Journal of computational design and engineering Vol.6 No.4
Multi-scale design can presumably stimulate greater intelligence in computer-aided design (CAD). Using the style-holon concept, this paper proposes a computational approach to address multi-scale style recognition for automobiles. A style-holon is both a whole—it contains sub-styles of which it is com-posed—as well as a part of a broader style. In this paper, we first apply a variable precision rough set-based approach to car evaluation and ranking. Secondly, we extracted and subsequently computed the each car’s characteristic lines from the CAD models. Finally, we identified style-holons using the property of a double-headed style-holon. A style-holon is necessarily included in a typical vertical arrangement with progressive accumulation and forms a nested hierarchical order called a holarchy of styles.We adopted an interactive cluster analysis to recognize style-holons. Our results demonstrate that car style depended on each brand’s individual strategy: a car is a form endowed with some structural stability. The style-holon also demonstrated that the evolution of characteristic lines should preserve the property of functional homeostasis (the same functional states) as well as the property of homeorhesis (the same stable course of change). For many car companies, stable brand recognition is an important design specification. The proposed approach was used to analyse a set of car styles as well as to assist in the design of char-acteristic model lines. A designer can also use this approach to evaluate whether or not the strategic requirement—style alignment with the style-holon of benchmarked cars--is satisfied.
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Intrarater and interrater reliability of pulse examination in traditional Indian Ayurvedic medicine
Vrinda Kurande,Rasmus Waagepetersen,Egon Toft,Ramjee Prasad 한국한의학연구원 2013 Integrative Medicine Research Vol.2 No.3
Background: In Ayurveda, pulse examination (nadipariksha) is an important tool to assess the status of three doshas: vata, pitta, and kapha. Long historical use has been seen as a documentation of its efficacy; however, there is a lack of a quantitative measure of the reliability of the pulse examination method. The objective of this study was to test the intrarater and interrater reliability of pulse examination in Ayurveda. Methods: Fifteen registered Ayurvedic doctors with 3–15 years of experience examined the pulse of 20 healthy volunteers twice, for a total of 600 examinations. The examinations were performed blind and in a random order. Only the current status of dosha-specific methods of pulse examination were considered. Cohen's weighted κ statistic was used as a measure of intrarater and interrater reliability, and a hypothesis of homogeneous diagnosis (random rating) was tested. Following this, we tested whether proportions of ratings were equal between doctors. Results: According to the Landis and Koch scale, the level of reliability ranged from poor to moderate. It was observed that the doctors more frequently diagnosed a combination of two doshas than a single dosha. The κ values were generally larger for experienced doctors (p = 0.04). Conclusion: Experience and proper training have important roles in pulse examination.
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Intelligent agents for feature modelling in computer aided design
Fougeres, Alain-Jerome,Ostrosi, Egon Society for Computational Design and Engineering 2018 Journal of computational design and engineering Vol.5 No.1
CAD modelling can be referred to as the process of generating an integrated multiple view model as a representation of multiple views of engineering design. In many situations, a change in the model of one view may conflict with the models of other views. In such situations, the model of some views needs to be adapted in order to make all models consistent. Thus, CAD models should be capable of adapting themselves to new situations. Recently, agent based technologies have been considered in order to increase both knowledge level and intelligence of real and virtual objects. The contribution of this paper consists in introducing the intelligent agents in intelligent CAD modelling. The proposed agents are elementary geometrical and topological objects. They incorporate the functions of observation, decision and action, and possess their own knowledge. Agents have the capacity of communication and inference based on the feature grammars. They are modelled as bio-dynamic objects that enjoy the properties of fusion, division and multiplication. Being aware of the context, the proposed agents interact to form potential regional transitory communities, called regions. Being aware of their belonging in a region, agents interact by generating virtual links (virtual extensions). These virtual links produce: (a) fusion of agents, (b) division of agents and c) multiplication of agents. The emerged agents interact with the other agents in a region to recognize each other and to form specific sub-communities, called intelligent features. From a CAD software development point of view, this paper advocates the idea of a new phase of CAD system development based on the agent-oriented programming (AOP) paradigm.
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Intelligent agents for feature modelling in computer aided design
Alain-Jérôme Fougères,Egon Ostrosi 한국CDE학회 2018 Journal of computational design and engineering Vol.5 No.1
CAD modelling can be referred to as the process of generating an integrated multiple view model as a representation of multiple views of engineering design. In many situations, a change in the model of one view may conflict with the models of other views. In such situations, the model of some views needs to be adapted in order to make all models consistent. Thus, CAD models should be capable of adapting themselves to new situations. Recently, agent based technologies have been considered in order to increase both knowledge level and intelligence of real and virtual objects. The contribution of this paper consists in introducing the intelligent agents in intelligent CAD modelling. The proposed agents are elementary geometrical and topological objects. They incorporate the functions of observation, decision and action, and possess their own knowledge. Agents have the capacity of communication and inference based on the feature grammars. They are modelled as bio-dynamic objects that enjoy the properties of fusion, division and multiplication. Being aware of the context, the proposed agents interact to form potential regional transitory communities, called regions. Being aware of their belonging in a region, agents interact by generating virtual links (virtual extensions). These virtual links produce: (a) fusion of agents, (b) division of agents and c) multiplication of agents. The emerged agents interact with the other agents in a region to recognize each other and to form specific sub-communities, called intelligent features. From a CAD software development point of view, this paper advocates the idea of a new phase of CAD system development based on the agent-oriented programming (AOP) paradigm.
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Single crystal growth and optical properties of a transparent perovskite oxide LaInO<sub>3</sub>
Jang, Dong Hyun,Lee, Woong-Jhae,Sohn, Egon,Kim, Hyung Joon,Seo, Dongmin,Park, Ju-Young,Choi, E. J.,Kim, Kee Hoon American Institute of Physics 2017 Journal of Applied Physics Vol.121 No.12
<P>Transparent LaInO3 single crystals have been grown using the optical floating zone method. Optimal growth, resulting in the highest optical transparency and best crystallinity, has been found at a growth speed of 15 mm/h and an O-2 gas pressure of 10 bar. Under these conditions, single crystals as large as similar to 4 x 4 mm 2 have been obtained. Chemical compositions and structural analyses reveal that the resulting LaInO3 single crystal is stoichiometric without any impurity phase and forms an orthorhombic perovskite structure. Optical transmission spectra exhibit multiple optical transitions in a wide spectral range (0.5-4.2 eV). Although the main optical absorption occurs at similar to 4.13 eV, weak absorption starts to develop from similar to 1.4 eV, in agreement with an activation energy of similar to 0.7 eV derived from electrical resistivity measurements. The dielectric constant epsilon is found to be 23.7 at room temperature. This LaInO3 single crystal can be used as a transparent perovskite substrate for growing oxide semiconductors with lattice constants close to similar to 4.12 angstrom, such as doped BaSnO3. Published by AIP Publishing.</P>
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