Resource discovery is a challenge in a distributed environment. Trade-off is often needed between... more Resource discovery is a challenge in a distributed environment. Trade-off is often needed between the speed and the accuracy of findings. There are two parts to resource discovery: the routing and matching of a query. This paper presents an adaptive approach to peer-to-peer (P2P) resource discovery which separates the routing of queries from the query matching mechanism. It focuses on improving the efficiency of routing search queries to increase the quality of the search results and also the scalability of the resource discovery in a highly decentralized P2P environment. This separation enables the adoption of any appropriate query matching/processing methods at a later stage. Three properties of scientific research communities provide the grounding for the approach: the existence of common interest groups, the willingness to share resources of common interests and the transitive relationship in the sharing behavior. The use of ontology enables ‘learning’ from past results and for providing guidance in future searches. By exploiting these features, the quality of search results can be improved and the network traffic reduced. Experimental results have provided some evidence to confirm the efficiency gain of this adaptive approach.
Computational Collective Intelligence. Technologies and Applications, 2012
Online social networks allow people to exchange information in their social lives. Most famous on... more Online social networks allow people to exchange information in their social lives. Most famous online social networks today such as Facebook, Twitter, or Linkedin are centralized. Users do not have much control over their personal data and every transaction around users requires the appearance of their service providers. This paper introduces a decentralized approach to building social networking based on ad-hoc Peer-to-Peer architecture in order to remove the bound of a centralized provider and provide a flexible way of connecting people. The proposed system focuses on bringing the ownership of user data back to the owner and allows user to build Interest-based network with high responsiveness and direct data exchange. The working implementation focuses on mobile device platform such as Android and iOS based smartphone with security techniques.
Third International Conference on Automated Production of Cross Media Content for Multi-Channel Distribution (AXMEDIS'07), 2007
Metadata is increasingly used in the digital industry for content description. In line with this ... more Metadata is increasingly used in the digital industry for content description. In line with this emerging trend, the AXMEDIS framework has employed several kinds of metadata for describing digital items embedded in AXMEDIS Objects. This paper introduces the metadata utilised inside AXMEDIS Objects and presents the AXMEDIS Metadata Editor and Mapper which provide graphical user interface and tools for metadata
ABSTRACT The development of social networks gives billions of users the con- venience and the abi... more ABSTRACT The development of social networks gives billions of users the con- venience and the ability to quickly connect and interact with others for raising opinions, sharing news, photos, etc. On the road for building tools to extend friend circles as large as possible, one of the most important functions of a social network is the recommendation which proposes a group of people having some common characteristics or relations. A majority of social networks have friend sugges- tion function based on mutual friends. However, this suggestion mechanism does not care much about the actual interests of the users hidden in his comments, posts or activities. This paper aims to propose a profile modeling and matching approach based on Latent Dirichlet Allocation (LDA) and pretopological-based multi-criteria aggregation to explore topics that exist in user posts on a social net- work. We explored interesting points of pretopology concepts - a mathematical tool - and applied them for better solving the raised problem. This approach al- lows us to find out users who have similar interests and also other information involving user profiles.
... Leeds, UK Page 6. 40 Kia Ng , Tran Vu Pham • To provide a vocabulary for describing the inter... more ... Leeds, UK Page 6. 40 Kia Ng , Tran Vu Pham • To provide a vocabulary for describing the interrelationships between digital objects and the operations performed on them in the digital preservation context. 4.1 Describing Performances ...
A disaccharide is a challenging case for high-resolution (1)H solid-state NMR because of the 24 d... more A disaccharide is a challenging case for high-resolution (1)H solid-state NMR because of the 24 distinct protons (14 aliphatic and 10 OH) having (1)H chemical shifts that all fall within a narrow range of approximately 3 to 7 ppm. High-resolution (1)H (500 MHz) double-quantum (DQ) combined rotation and multiple pulse sequence (CRAMPS) solid-state NMR spectra of beta-maltose monohydrate are presented. (1)H-(1)H DQ-SQ CRAMPS spectra are presented together with (1)H (DQ)-(13)C correlation spectra obtained with a new pulse sequence that correlates a high-resolution (1)H DQ dimension with a (13)C single quantum (SQ) dimension using the refocused INEPT pulse-sequence element to transfer magnetization via one-bond (13)C-(1)H J couplings. Compared to the observation of only a single broad peak in a (1)H DQ spectrum recorded at 30 kHz magic-angle spinning (MAS), the use of DUMBO (1)H homonuclear decoupling in the (1)H DQ CRAMPS experiment allows the resolution of distinct DQ correlation peaks which, in combination with first-principles chemical shift calculations based on the GIPAW (Gauge Including Projector Augmented Waves) plane-wave pseudopotential approach, enables the assignment of the (1)H resonances to the 24 distinct protons. We believe this to be the first experimental solid-state NMR determination of the hydroxyl OH (1)H chemical shifts for a simple sugar. Variable-temperature (1)H-(1)H DQ CRAMPS spectra reveal small increases in the (1)H chemical shifts of the OH resonances upon decreasing the temperature from 348 K to 248 K.
International Journal of Metadata, Semantics and Ontologies, 2008
Interdisciplinary Centre for Scientific Research in Music (ICSRiM), School of Computing and Schoo... more Interdisciplinary Centre for Scientific Research in Music (ICSRiM), School of Computing and School of Music, University of Leeds, Leeds LS2 9JT, UK E-mail: kia@icsrim.org.uk E-mail: tranp@icsrim.org.uk E-mail: bee@icsrim.org.uk E-mail: alex@icsrim.org.uk E-mail: ...
ABSTRACT Solid-state NMR (SSNMR) is capable of providing detailed structural information about or... more ABSTRACT Solid-state NMR (SSNMR) is capable of providing detailed structural information about organic and pharmaceutical cocrystals and complexes. SSNMR nondestructively analyzes small amounts of powdered material and generally yields data with higher information content than vibrational spectroscopy and powder X-ray diffraction methods. These advantages can be utilized in the analysis of pharmaceutical cocrystals, which are often initially produced using solvent drop grinding techniques that do not lend themselves to single crystal growth for X-ray diffraction studies. In this work, several molecular complexes and cocrystals are examined to understand the capabilities of the SSNMR techniques, particularly their ability to prove or disprove molecular association and observe structural features such as hydrogen bonding. Dipolar correlation experiments between spin pairs such as 1H−1H, 1H−13C, and 19F−13C are applied to study hydrogen bonding, intermolecular contacts, and spin diffusion to link individual molecules together in a crystal structure and quickly prove molecular association. Analysis of the principal components of chemical shift tensors is also utilized where relevant, as these are more sensitive to structural effects than the isotropic chemical shift alone. In addition, 1H T1 relaxation measurements are also demonstrated as a means to prove phase separation of components. On the basis of these results, a general experimental approach to cocrystal analysis by SSNMR is suggested.
... Jacalyn S. Clawson* , Frederick G. Vogt , Jeffrey Brum , Joseph Sisko , Daniel B. Pat... more ... Jacalyn S. Clawson* , Frederick G. Vogt , Jeffrey Brum , Joseph Sisko , Daniel B. Patience , Wenning Dai , Sonja Sharpe , Alan D. Jones , Tran N. Pham ,Matthew N. Johnson § and Royston CP Copley §. Preclinical ...
Resource discovery is a challenge in a distributed environment. Trade-off is often needed between... more Resource discovery is a challenge in a distributed environment. Trade-off is often needed between the speed and the accuracy of findings. There are two parts to resource discovery: the routing and matching of a query. This paper presents an adaptive approach to peer-to-peer (P2P) resource discovery which separates the routing of queries from the query matching mechanism. It focuses on improving the efficiency of routing search queries to increase the quality of the search results and also the scalability of the resource discovery in a highly decentralized P2P environment. This separation enables the adoption of any appropriate query matching/processing methods at a later stage. Three properties of scientific research communities provide the grounding for the approach: the existence of common interest groups, the willingness to share resources of common interests and the transitive relationship in the sharing behavior. The use of ontology enables ‘learning’ from past results and for providing guidance in future searches. By exploiting these features, the quality of search results can be improved and the network traffic reduced. Experimental results have provided some evidence to confirm the efficiency gain of this adaptive approach.
Computational Collective Intelligence. Technologies and Applications, 2012
Online social networks allow people to exchange information in their social lives. Most famous on... more Online social networks allow people to exchange information in their social lives. Most famous online social networks today such as Facebook, Twitter, or Linkedin are centralized. Users do not have much control over their personal data and every transaction around users requires the appearance of their service providers. This paper introduces a decentralized approach to building social networking based on ad-hoc Peer-to-Peer architecture in order to remove the bound of a centralized provider and provide a flexible way of connecting people. The proposed system focuses on bringing the ownership of user data back to the owner and allows user to build Interest-based network with high responsiveness and direct data exchange. The working implementation focuses on mobile device platform such as Android and iOS based smartphone with security techniques.
Third International Conference on Automated Production of Cross Media Content for Multi-Channel Distribution (AXMEDIS'07), 2007
Metadata is increasingly used in the digital industry for content description. In line with this ... more Metadata is increasingly used in the digital industry for content description. In line with this emerging trend, the AXMEDIS framework has employed several kinds of metadata for describing digital items embedded in AXMEDIS Objects. This paper introduces the metadata utilised inside AXMEDIS Objects and presents the AXMEDIS Metadata Editor and Mapper which provide graphical user interface and tools for metadata
ABSTRACT The development of social networks gives billions of users the con- venience and the abi... more ABSTRACT The development of social networks gives billions of users the con- venience and the ability to quickly connect and interact with others for raising opinions, sharing news, photos, etc. On the road for building tools to extend friend circles as large as possible, one of the most important functions of a social network is the recommendation which proposes a group of people having some common characteristics or relations. A majority of social networks have friend sugges- tion function based on mutual friends. However, this suggestion mechanism does not care much about the actual interests of the users hidden in his comments, posts or activities. This paper aims to propose a profile modeling and matching approach based on Latent Dirichlet Allocation (LDA) and pretopological-based multi-criteria aggregation to explore topics that exist in user posts on a social net- work. We explored interesting points of pretopology concepts - a mathematical tool - and applied them for better solving the raised problem. This approach al- lows us to find out users who have similar interests and also other information involving user profiles.
... Leeds, UK Page 6. 40 Kia Ng , Tran Vu Pham • To provide a vocabulary for describing the inter... more ... Leeds, UK Page 6. 40 Kia Ng , Tran Vu Pham • To provide a vocabulary for describing the interrelationships between digital objects and the operations performed on them in the digital preservation context. 4.1 Describing Performances ...
A disaccharide is a challenging case for high-resolution (1)H solid-state NMR because of the 24 d... more A disaccharide is a challenging case for high-resolution (1)H solid-state NMR because of the 24 distinct protons (14 aliphatic and 10 OH) having (1)H chemical shifts that all fall within a narrow range of approximately 3 to 7 ppm. High-resolution (1)H (500 MHz) double-quantum (DQ) combined rotation and multiple pulse sequence (CRAMPS) solid-state NMR spectra of beta-maltose monohydrate are presented. (1)H-(1)H DQ-SQ CRAMPS spectra are presented together with (1)H (DQ)-(13)C correlation spectra obtained with a new pulse sequence that correlates a high-resolution (1)H DQ dimension with a (13)C single quantum (SQ) dimension using the refocused INEPT pulse-sequence element to transfer magnetization via one-bond (13)C-(1)H J couplings. Compared to the observation of only a single broad peak in a (1)H DQ spectrum recorded at 30 kHz magic-angle spinning (MAS), the use of DUMBO (1)H homonuclear decoupling in the (1)H DQ CRAMPS experiment allows the resolution of distinct DQ correlation peaks which, in combination with first-principles chemical shift calculations based on the GIPAW (Gauge Including Projector Augmented Waves) plane-wave pseudopotential approach, enables the assignment of the (1)H resonances to the 24 distinct protons. We believe this to be the first experimental solid-state NMR determination of the hydroxyl OH (1)H chemical shifts for a simple sugar. Variable-temperature (1)H-(1)H DQ CRAMPS spectra reveal small increases in the (1)H chemical shifts of the OH resonances upon decreasing the temperature from 348 K to 248 K.
International Journal of Metadata, Semantics and Ontologies, 2008
Interdisciplinary Centre for Scientific Research in Music (ICSRiM), School of Computing and Schoo... more Interdisciplinary Centre for Scientific Research in Music (ICSRiM), School of Computing and School of Music, University of Leeds, Leeds LS2 9JT, UK E-mail: kia@icsrim.org.uk E-mail: tranp@icsrim.org.uk E-mail: bee@icsrim.org.uk E-mail: alex@icsrim.org.uk E-mail: ...
ABSTRACT Solid-state NMR (SSNMR) is capable of providing detailed structural information about or... more ABSTRACT Solid-state NMR (SSNMR) is capable of providing detailed structural information about organic and pharmaceutical cocrystals and complexes. SSNMR nondestructively analyzes small amounts of powdered material and generally yields data with higher information content than vibrational spectroscopy and powder X-ray diffraction methods. These advantages can be utilized in the analysis of pharmaceutical cocrystals, which are often initially produced using solvent drop grinding techniques that do not lend themselves to single crystal growth for X-ray diffraction studies. In this work, several molecular complexes and cocrystals are examined to understand the capabilities of the SSNMR techniques, particularly their ability to prove or disprove molecular association and observe structural features such as hydrogen bonding. Dipolar correlation experiments between spin pairs such as 1H−1H, 1H−13C, and 19F−13C are applied to study hydrogen bonding, intermolecular contacts, and spin diffusion to link individual molecules together in a crystal structure and quickly prove molecular association. Analysis of the principal components of chemical shift tensors is also utilized where relevant, as these are more sensitive to structural effects than the isotropic chemical shift alone. In addition, 1H T1 relaxation measurements are also demonstrated as a means to prove phase separation of components. On the basis of these results, a general experimental approach to cocrystal analysis by SSNMR is suggested.
... Jacalyn S. Clawson* , Frederick G. Vogt , Jeffrey Brum , Joseph Sisko , Daniel B. Pat... more ... Jacalyn S. Clawson* , Frederick G. Vogt , Jeffrey Brum , Joseph Sisko , Daniel B. Patience , Wenning Dai , Sonja Sharpe , Alan D. Jones , Tran N. Pham ,Matthew N. Johnson § and Royston CP Copley §. Preclinical ...
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