• Title/Summary/Keyword: Varela

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Autopoiesis, Affordance, and Mimesis: Layout for Explication of Complexity of Cognitive Interaction between Environment and Human (오토포이에시스, 어포던스, 미메시스: 환경과 인간의 인지적 상호작용의 복잡성 해명을 위한 밑그림)

  • Shim, Kwang Hyun
    • Korean Journal of Cognitive Science
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    • v.25 no.4
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    • pp.343-384
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    • 2014
  • In order to unravel the problems of the mind, today's cognitive science has expanded its perspective from the narrow framework of the past computer model or neuronal network model to the wider frameworks of interaction with the brain in interaction with the body in interaction with their environments. The theories of 'the extended mind', 'embodied mind', or 'enactive mind' appeared through such processes are working on a way to move into the environments while the problem to unravel the complex process of interactions between the mind, the body and the environments are left alone. This problem can be traced back as far as to Gibson and Maturana & Varela who tried at first to unravel the problem of the mind in terms of interaction between the brain, the body and there environments in 1960~70s. It's because Gibson stressed the importance of the 'affordance' provided by the environment while Maturana & Varela emphasized the 'autonomy' of auto-poiesis of life. However, it will be proper to say that there are invariants in the affordances provided by the environment as well as the autonomy of life in the state of structural coupling of the environment's variants and life's openness toward the environment. In this case, the confrontational points between Gibson and Maturana & Varela will be resolved. In this article, I propose Benjamin's theory of mimesis as a mediator of both theories. Because Benjamin's concept of mimesis has the process of making a constellation of the embodiment of the affordance and the enaction of new affordance into the environment at the same time, Gibson's concept of the affordance and Maturana & Varela's concept of embodiment and enaction will be so smoothly interconnected to circulate through the medium of Benjamin's concept of mimesis.

The Language of Arbitration Agreements and Availability of Class Arbitration: Focusing on the U.S. Supreme Court's Lamps Plus, Inc. v. Varela Decision

  • Jun, Jung Won
    • Journal of Arbitration Studies
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    • v.31 no.3
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    • pp.25-42
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    • 2021
  • Arbitration is an alternative dispute resolution mechanism based on the parties' agreement to resolve any disputes parties may have by arbitration rather than litigation in court. Parties' consent to arbitrate, which must be manifest in the parties' arbitration clause or agreement, is the foundation for arbitration; thus, the language of an arbitration agreement is often of utmost importance in determining the intent of the parties regarding many aspects of arbitration proceedings, such as, the scope of arbitral proceedings, arbitral seat, and authority of arbitral tribunals, among others. Recently, the U.S. Supreme Court held in Lamps Plus, Inc. v. Varela (2019) that ambiguity in arbitration agreement as to availability of class arbitration should be resolved in favor of individual arbitration, and therefore, class arbitration would be precluded. Such holding was met with criticism by four separate dissenting opinions, in which the dissenting Justices have disagreed with the majority's interpretation of the arbitration agreement at issue, as well as, its rejection of application of state law in resolving contractual ambiguity. This article analyzes the Supreme Court's decision and reviews the Court's approach in construction of the arbitration agreement. Nevertheless, because the Supreme Court declined to provide clear guidelines as to precisely what contractual basis is required to permit class arbitration, either silence or ambiguity in arbitration agreements will be resolved by disallowing class arbitration.

Double controller of wind induced bending oscillations in telecom towers

  • Battista, Ronaldo C.;Pfeil, Michele S.;Carvalho, Eliane M.L.;Varela, Wendell D.
    • Smart Structures and Systems
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    • v.21 no.1
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    • pp.99-111
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    • 2018
  • Wind induced large bending oscillation amplitudes in tall and slender telecommunication steel towers may lead to precocious fatigue cracks and consequent risk of collapse of these structures, many of them installed in rural areas alongside highways and in highly populated urban areas. Varying stress amplitudes at hot spots may be attenuated by means of passive control mechanical devices installed in the tower. This paper gives an account of both mathematical-numerical model and the technique applied to design and evaluate the performance of a double controller installed in existing towers which is composed by a nonlinear pendulum and a novel type of passive controller described herein as a planar motion disk mounted on shear springs. Results of experimental measurements carried out on two slender tubular steel towers under wind action demonstrate the efficiency of the double controllers in attenuating the towers bending oscillation amplitudes and consequent stress amplitudes extending the towers fatigue life.

The unicellular green alga Dunaliella salina Teod. as a model for abiotic stress tolerance: genetic advances and future perspectives

  • Ramos, Ana A.;Polle, Jurgen;Tran, Duc;Cushman, John C.;Jin, Eon-Seon;Varela, Joao C.
    • ALGAE
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    • v.26 no.1
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    • pp.3-20
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    • 2011
  • The physiology of the unicellular green alga Dunaliella salina in response to abiotic stress has been studied for several decades. Early D. salina research focused on its remarkable salinity tolerance and ability, upon exposure to various abiotic stresses, to accumulate high concentrations of $\beta$-carotene and other carotenoid pigments valued highly as nutraceuticals. The simple life cycle and growth requirements of D. salina make this organism one of the large-scale commercially exploited microalgae for natural carotenoids. Recent advances in genomics and proteomics now allow investigation of abiotic stress responses at the molecular level. Detailed knowledge of isoprenoid biosynthesis mechanisms and the development of molecular tools and techniques for D. salina will allow the improvement of physiological characteristics of algal strains and the use of transgenic algae in bioreactors. Here we review D. salina isoprenoid and carotenoid biosynthesis regulation, and also the biotechnological and genetic transformation procedures developed for this alga that set the stage for its future use as a production system.

Monitoring Cathodic Shielding and Corrosion under Disbonded Coatings

  • Varela, F.;Tan, M. YJ;Hinton, B.;Forsyth, M.
    • Corrosion Science and Technology
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    • v.16 no.3
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    • pp.109-114
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    • 2017
  • Monitoring of corrosion is in most cases based on simulation of environmental conditions on a large and complex structure such as a buried pipeline using a small probe, and the measurement of thermodynamics and kinetics of corrosion processes occurring on the probe surface. This paper presents a hybrid corrosion monitoring probe designed for simulating deteriorating conditions wrought by disbonded coatings and for measuring current densities and distribution of such densities on a simulated pipeline surface. The concept of the probe was experimentally evaluated using immersion tests under cathodic protection (CP) in high resistivity aqueous solution. Underneath the disbonded area, anodic currents and cathodic currents were carefully measured. Anodic current densities were used to calculate metal loss according to Faraday's law. Calculated corrosion patterns were compared with corrosion damage observed at the surface of the probe after a series of stringent tests. The capability of the probe to measure anodic current densities under CP, without requiring interruption, was demonstrated in high resistivity aqueous solution. The pattern of calculated metal loss correlated well with corrosion products distribution observed at the array surface. Working principles of the probe are explained in terms of electrochemistry.

Molecular Cloning and Characterization of Mannitol-1-Phosphate Dehydrogenase from Vibrio cholerae

  • Rambhatla, Prashanthi;Kumar, Sanath;Floyd, Jared T.;Varela, Manuel F.
    • Journal of Microbiology and Biotechnology
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    • v.21 no.9
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    • pp.914-920
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    • 2011
  • Vibrio cholerae utilizes mannitol through an operon of the phosphoenolpyruvate-dependent phosphotransferase (PTS) type. A gene, mtlD, encoding mannitol-1-phosphate dehydrogenase was identified within the 3.9 kb mannitol operon of V. cholerae. The mtlD gene was cloned from V. cholerae O395, and the recombinant enzyme was functionally expressed in E. coli as a $6{\times}$His-tagged protein and purified to homogeneity. The recombinant protein is a monomer with a molecular mass of 42.35 kDa. The purified recombinant MtlD reduced fructose 6-phosphate (F6P) using NADH as a cofactor with a $K_m$ of $1.54{\pm}0.1$ mM and $V_{max}$ of $320.8{\pm}7.81\;{\mu}mol$/min/mg protein. The pH and temperature optima for F6P reduction were determined to be 7.5 and $37^{\circ}C$, respectively. Using quantitative real-time PCR analysis, mtlD was found to be constitutively expressed in V. cholerae, but the expression was up-regulated when grown in the presence of mannitol. The MtlD expression levels were not significantly different between V. cholerae O1 and non-O1 strains.

An Overview of New Progresses in Understanding Pipeline Corrosion

  • Tan, M. YJ;Varela, F.;Huo, Y.;Gupta, R.;Abreu, D.;Mahdavi, F.;Hinton, B.;Forsyth, M.
    • Corrosion Science and Technology
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    • v.15 no.6
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    • pp.271-280
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    • 2016
  • An approach to achieving the ambitious goal of cost effectively extending the safe operation life of energy pipeline to 100 years is the application of health monitoring and life prediction tools that are able to provide both long-term remnant pipeline life prediction and in-situ pipeline condition monitoring. A critical step is the enhancement of technological capabilities that are required for understanding and quantifying the effects of key factors influencing buried steel pipeline corrosion and environmentally assisted materials degradation, and the development of condition monitoring technologies that are able to provide in-situ monitoring and site-specific warning of pipeline damage. This paper provides an overview of our current research aimed at developing new sensors and electrochemical cells for monitoring, categorising and quantifying the level and nature of external pipeline and coating damages under the combined effects of various inter-related variables and processes such as localised corrosion, coating cracking and disbondment, cathodic shielding, transit loss of cathodic protection.

Management of large class II lesions in molars: how to restore and when to perform surgical crown lengthening?

  • Dablanca-Blanco, Ana Belen;Blanco-Carrion, Juan;Martin-Biedma, Benjamin;Varela-Patino, Purificacion;Bello-Castro, Alba;Castelo-Baz, Pablo
    • Restorative Dentistry and Endodontics
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    • v.42 no.3
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    • pp.240-252
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    • 2017
  • The restoration of endodontic tooth is always a challenge for the clinician, not only due to excessive loss of tooth structure but also invasion of the biological width due to large decayed lesions. In this paper, the 7 most common clinical scenarios in molars with class II lesions ever deeper were examined. This includes both the type of restoration (direct or indirect) and the management of the cavity margin, such as the need for deep margin elevation (DME) or crown lengthening. It is necessary to have the DME when the healthy tooth remnant is in the sulcus or at the epithelium level. For caries that reaches the connective tissue or the bone crest, crown lengthening is required. Endocrowns are a good treatment option in the endodontically treated tooth when the loss of structure is advanced.