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Extending the Brewster Effect to Arbitrary Angle and Polarization using Bianisotropic Metasurfaces [article]

Guillaume Lavigne, Christophe Caloz
2018 arXiv   pre-print
A bianisotropic metasurface design is proposed for extending the Brewster effect to arbitrary angles and polarizations.  ...  This Brewster effect extension may find various applications in microwave and optical systems. V.  ...  So, we now have to determine the field specifications for arbitrary angle and polarization Brewster effect.  ... 
arXiv:1801.08517v1 fatcat:w3op2pyq35gdne6mj7j45mmjf4

Metrics for Ranking Ontologies

Harith Alani, Christopher Brewster
2006 The Web Conference  
Representing knowledge using domain ontologies has shown to be a useful mechanism and format for managing and exchanging information. Due to the difficulty and cost of building ontologies, a number of ontology libraries and search engines are coming to existence to facilitate reusing such knowledge structures. The need for ontology ranking techniques is becoming crucial as the number of ontologies available for reuse is continuing to grow. In this paper we present AKTiveRank, a prototype system
more » ... for ranking ontologies based on the analysis of their structures. We describe the metrics used in the ranking system and present an experiment on ranking ontologies returned by a popular search engine for an example query.
dblp:conf/www/AlaniB06 fatcat:3fsijzyqb5f2ja2bitbpoc4idm

Inhibition of FAAH, TRPV1, and COX2 by NSAID–serotonin conjugates

Tyler M. Rose, Christopher A. Reilly, Cassandra E. Deering-Rice, Clinton Brewster, Chelsea Brewster
2014 Bioorganic & Medicinal Chemistry Letters  
Serotonin was linked by amidation to the carboxylic acid groups of a series of structurally diverse NSAIDs. The resulting NSAID-serotonin conjugates were tested in vitro for their ability to inhibit FAAH, TRPV1, and COX2. Ibuprofen-5-HT and Flurbiprofen-5-HT inhibited all three targets with approximately the same potency as N-arachidonoyl serotonin (AA-5-HT), while Fenoprofen-5-HT and Naproxen-5-HT showed activity as dual inhibitors of TRPV1 and COX2. Keywords NSAID; FAAH; fatty acid amide
more » ... lase; TRPV1; transient receptor potential vanilloid type 1; dual inhibition; multimodal inhibition; arachidonoyl serotonin Fatty acid amide hydrolase (FAAH) is a membrane-associated, intracellular enzyme that degrades endocannabinoids, including anandamide (N-arachidonoyl ethanolamine), by amide hydrolysis. 1 Inhibition of FAAH induces cannabinoid (CB) receptor-dependent analgesia in rodents, often without causing the full tetrad of symptoms (anti-nociception, hypothermia, hypolocomotion, catalepsy) associated with direct CB receptor agonists. 2 This is thought to be due to the localized action of endocannabinoids, which are only synthesized as-needed in those regions of the body where they are required. As a result, inhibitors of FAAH have been aggressively pursued as a potentially new class of drugs for pain relief. 3 Although many potent and selective FAAH inhibitors have been reported in the literature, the first phase II clinical trial with one such inhibitor, PF-04457845, was terminated early due to a lack of efficacy in treating osteoarthritis pain compared with naproxen. 4 This, in spite of a greater than 10-fold excess of anandamide in the blood of patients treated with the
doi:10.1016/j.bmcl.2014.10.064 pmid:25467164 pmcid:PMC4258163 fatcat:awvemh44ejagnf53nwal4jvuci

Ranking Ontologies with AKTiveRank [chapter]

Harith Alani, Christopher Brewster, Nigel Shadbolt
2006 Lecture Notes in Computer Science  
Christopher Brewster has also been supported by the UK EPSRC under grant number GR/T22902/01  ... 
doi:10.1007/11926078_1 fatcat:5rxj6e6vovanddldcjbz3xcjpi

Brewster Angle Polarizing Beamsplitter Laser Damage Competition: P polarization

Christopher J. Stolz, Jeff Runkel, Gregory J. Exarhos, Vitaly E. Gruzdev, Joseph A. Menapace, Detlev Ristau, M J Soileau
2012 Laser-Induced Damage in Optical Materials: 2012  
Brewster angle plate polarizing beamsplitters play a critical role in splitting and combining beams within high power laser systems.  ...  femtosecond (200 fs) normal incident high reflector 2 , a 351 nm antireflection coating 3 tested with 7.5 ns pulses, a 193 nm excimer mirror 4 tested with 13 ns pulses, and finally this year's competition of a Brewster  ...  Overcoat thicknesses have been determined to have a significant impact on the laser resistance of Brewster angle plate polarizers at "S" polarization, however, this remains an unanswered question at "P  ... 
doi:10.1117/12.981735 fatcat:s5l7lnlefjeztlibqr4y2hhhl4

Transient absorption spectroscopy on spiropyran monolayers using nanosecond pump–probe Brewster angle reflectometry

Bernhard Siebenhofer, Sergey Gorelik, Martin J. Lear, Hong Yan Song, Christoph Nowak, Jonathan Hobley
2013 Photochemical and Photobiological Sciences  
Self-assembled monolayers of 11-(3',3'-dimethyl-6,8-dinitrospiro[chromene-2,2'-indoline]-1'-yl) undecanoic acid (amphiphilic spiropyran) at the air-water interface are studied using Brewster angle reflectometry  ...  Experimental Brewster angle reflectometer Two types of BAR systems are used in this work.  ...  Fig. 1 1 Setup of the pump-probe Brewster angle reflectometer. The top right insert shows the applied method of self-referencing.  ... 
doi:10.1039/c3pp25397j pmid:23396378 fatcat:ki67ezvyrrcizpukswmrfyqxmi

Knowledge Acquisition for Knowledge Management

Christopher Brewster, Fabio Ciravegna, Yorick Wilks
2001 International Joint Conference on Artificial Intelligence  
dblp:conf/ijcai/BrewsterCW01 fatcat:rx6lpuy5hfgajjmbkuowqsziw4

User-Centred Ontology Learning for Knowledge Management [chapter]

Christopher Brewster, Fabio Ciravegna, Yorick Wilks
2002 Lecture Notes in Computer Science  
Automatic ontology building is a vital issue in many fields where they are currently built manually. This paper presents a user-centred methodology for ontology construction based on the use of Machine Learning and Natural Language Processing. In our approach, the user selects a corpus of texts and sketches a preliminary ontology (or selects an existing one) for a domain with a preliminary vocabulary associated to the elements in the ontology (lexicalisations). Examples of sentences involving
more » ... ch lexicalisation (e.g. ISA relation) in the corpus are automatically retrieved by the system. Retrieved examples are validated by the user and used by an adaptive Information Extraction system to generate patterns that discover other lexicalisations of the same objects in the ontology, possibly identifying new concepts or relations. New instances are added to the existing ontology or used to tune it. This process is repeated until a satisfactory ontology is obtained. The methodology largely automates the ontology construction process and the output is an ontology with an associated trained leaner to be used for further ontology modifications.
doi:10.1007/3-540-36271-1_18 fatcat:gczzoigwpfdmllii3glbmsgl5y


Stephen Brewster, David McGookin, Christopher Miller
2006 Proceedings of the SIGCHI conference on Human Factors in computing systems - CHI '06  
We present a study into the use of smell for searching digital photo collections. Many people now have large photo libraries on their computers and effective search tools are needed. Smell has a strong link to memory and emotion so may be a good way to cue recall when searching. Our study compared text and smell based tagging. For the first stage we generated a set of smell and tag names from user descriptions of photos. Participants then used these to tag photos, returning two weeks later to
more » ... swer questions on their photos. Results showed that participants could tag effectively with text labels, as this is a common and familiar task. Performance with smells was lower but participants performed significantly above chance, with some participants using smells well. This suggests that smell has potential. Results also showed that some smells were consistently identified and useful, but some were not and highlighted issues with smell delivery devices. We also discuss some practical issues of using smell for interaction.
doi:10.1145/1124772.1124869 dblp:conf/chi/BrewsterMM06 fatcat:u5oorwzumfc63jy233mnwb2uhi

Ontology-based Access Control for FAIR Data

Christopher Brewster, Barry Nouwt, Stephan Raaijmakers, Jack Verhoosel
2019 Data Intelligence  
Brewster ( worked on the introduction, conclusions and related work and were responsible for overall editing.  ... 
doi:10.1162/dint_a_00029 fatcat:odhcbbebzzebhosdfotenvjo7q

Representing Supply Chain Events on the Web of Data

Monika Solanki, Christopher Brewster
2013 International Semantic Web Conference  
The Electronic Product Code Information Service (EPCIS) is an EPCglobal standard, that aims to bridge the gap between the physical world of RFID 1 tagged artifacts, and information systems that enable their tracking and tracing via the Electronic Product Code (EPC). Central to the EPCIS data model are "events" that describe specific occurrences in the supply chain. EPCIS events, recorded and registered against EPC tagged artifacts, encapsulate the "what", "when", "where" and "why" of these
more » ... acts as they flow through the supply chain. In this paper we propose an ontological model for representing EPCIS events on the Web of data. Our model provides a scalable approach for the representation, integration and sharing of EPCIS events as linked data via RESTful interfaces, thereby facilitating interoperability, collaboration and exchange of EPC related data across enterprises on a Web scale.
dblp:conf/semweb/SolankiB13a fatcat:d4mvclsdvffj7dp5vn72hmc7ea

Legibility, Privacy and Creativity: Linked Data in a Surveillance Society

Christopher Brewster, Dougald Hine
2013 International Semantic Web Conference  
This paper looks at the issue of privacy and anonymity through the prism of Scott's concept of legibility i.e. the desire of the state to obtain an ever more accurate mapping of its domain and the actors in its domain. We argue that privacy was absent in village life in the past, and it has arisen as a temporary phenomenon arising from the lack of appropriate technology to make all life in the city legible. Cities have been the loci of creativity for the major part of human civilisation. There
more » ... s something specific about the illegibility of cities which facilitates creativity and innovation. By providing the technology to catalogue and classify all objects and ideas around us, this leads to a consideration of semantic web technologies, Linked Data and the Internet of Things as unwittingly furthering this ever greater legibility. There is a danger that the over description of a domain will lead to a loss in creativity and innovation. We conclude by arguing that our prime concern must be to preserve illegibility because the survival of some form, any form, of civilisation depends upon it.
dblp:conf/semweb/BrewsterH13 fatcat:t3tafrvkhnczdksrphufgezefi

OntoPedigree: Modelling pedigrees for traceability in supply chains

Monika Solanki, Christopher Brewster, Krzysztof Janowicz
2016 Semantic Web Journal  
The sharing of product and process information plays a central role in coordinating supply chains operations and is a key driver for their success. "Linked pedigrees" -linked datasets, that encapsulate event based traceability information of artifacts as they move along the supply chain, provide a scalable mechanism to record and facilitate the sharing of track and trace knowledge among supply chain partners. In this paper we present "OntoPedigree" a content ontology design pattern for the
more » ... sentation of linked pedigrees, that can be specialised and extended to define domain specific traceability ontologies. Events captured within the pedigrees are specified using EPCIS -a GS1 standard for the specification of traceability information within and across enterprises, while certification information is described using PROV -a vocabulary for modelling provenance of resources. We exemplify the utility of OntoPedigree in linked pedigrees generated for supply chains within the perishable goods and pharmaceuticals sectors.
doi:10.3233/sw-150179 fatcat:73wv744kjbhphj2qnqlywun2ee

Resource management for flood response in Mexico

Oscar Rodriguez-Espindola, Pavel Albores, Christopher Brewster, R. Hochreiter
2017 ITM Web of Conferences  
Emergency logistics is acquiring a crucial role aiming to provide adequate care and support for people affected by catastrophic situations; dealing with a large number of stakeholders, scarcity of resources and high stakes. Considering the importance of balancing resources from different participants to improve operations, this research introduces a bi-criteria response optimisation model aiming to maximise the service provided to disaster victims while making efficient use of resources. The
more » ... el provides support for relief distribution, inventory management and resource allocation. But beyond the optimisation of logistical decisions, the model is able to determine which organisations to use at the appropriate timeframe, so as to prevent shortages and convergence. The model is applied to a case study on a flood in Mexico in order to compare its results with real activities performed by authorities and draw conclusions.
doi:10.1051/itmconf/20171400007 fatcat:sbz632s2dfe2njkiklktt6g6uu

Issues in learning an ontology from text

Christopher Brewster, Simon Jupp, Joanne Luciano, David Shotton, Robert D Stevens, Ziqi Zhang
2009 BMC Bioinformatics  
Ontology construction for any domain is a labour intensive and complex process. Any methodology that can reduce the cost and increase efficiency has the potential to make a major impact in the life sciences. This paper describes an experiment in ontology construction from text for the animal behaviour domain. Our objective was to see how much could be done in a simple and relatively rapid manner using a corpus of journal papers. We used a sequence of pre-existing text processing steps, and here
more » ... describe the different choices made to clean the input, to derive a set of terms and to structure those terms in a number of hierarchies. We describe some of the challenges, especially that of focusing the ontology appropriately given a starting point of a heterogeneous corpus. Results: Using mainly automated techniques, we were able to construct an 18055 term ontologylike structure with 73% recall of animal behaviour terms, but a precision of only 26%. We were able to clean unwanted terms from the nascent ontology using lexico-syntactic patterns that tested the validity of term inclusion within the ontology. We used the same technique to test for subsumption relationships between the remaining terms to add structure to the initially broad and shallow structure we generated. All outputs are available at animalbehaviour/. Conclusion: We present a systematic method for the initial steps of ontology or structured vocabulary construction for scientific domains that requires limited human effort and can make a contribution both to ontology learning and maintenance. The method is useful both for the exploration of a scientific domain and as a stepping stone towards formally rigourous ontologies. The filtering of recognised terms from a heterogeneous corpus to focus upon those that are the topic of the ontology is identified to be one of the main challenges for research in ontology learning.
doi:10.1186/1471-2105-10-s5-s1 pmid:19426458 pmcid:PMC2679401 fatcat:gvcpzt2ryjf3hi23vasfqz3woy
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