Browsing by Subject "ontologies"
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Item Analyzing Social Networks on the Semantic Web(IEEE, 2005-01-01) Ding, Li; Finin, Tim; Joshi, AnupamWe report on a recent study of the way FOAF and other semantic web ontologies are being used to describe people and their social relations.Item Authorization and Privacy for Semantic Web Services(IEEE, 2004-07-01) Kagal, Lalana; Paoucci, Massimo; Srinivasan, Naveen; Denker, Grit; Finin, Tim; Sycara, KatiaWhen choosing, composing, invoking or monitoring a service it may be important or even critical to understand it's security attributes and policies. By security, we refer to a range of related aspects including authentication, authorization, confidentiality and privacy. We discuss how to incorporate security information into the OWL-S Semantic Web service model by integrating descriptions of semantically rich policies for authorization, privacy and confidentiality. These policies can include conditions on attributes of the service requester, provider, and the general context. We describe the ontologies used to annotate OWL-S input and output parameters with respect to their security characteristics, including various types of encryption and digital signatures. We present an algorithm for testing policy compliance that can be integrated into the service selection process of the OWL-S MatchMaker. This integration allows the requester to invoke only those services that match the formers policies and whose policies are met by the requester.Item Introduction to the special issue on ontologies in agent systems(Cambridge University Press, 2002-08-21) Cranefield, Stephen; Willmott, Steven; Finin, TimIt is now more than ten years since researchers in the US Knowledge Sharing Effort envisaged a future where complex systems could be built by combining knowledge and services from multiple knowledge bases and the first agent communication language, KQML, was proposed (Neches et al., 1991). This model of communication, based on speech acts, a declarative message content representation language and the use of explicit ontologies defining the domains of discourse (Genesereth & Ketchpel, 1994), has become widely recognised as having great benefits for the integration of disparate and distributed information sources to form an open, extensible and loosely coupled system. In particular, this idea has become a key tenet in the multi-agent systems research community.Item Managing Cloud Storage Obliviously(IEEE, 2017-01-19) Narkhede, Vaishali; Joshi, Karuna Pande; Finin, Tim; Choi, SeungGeol; Aviv, Adam; Roche, Daniel SConsumers want to ensure that their enterprise data is stored securely and obliviously on the cloud, such that the data objects or their access patterns are not revealed to anyone, including the cloud provider, in the public cloud environment. We have created a detailed ontology describing the oblivious cloud stor-age models and role based access controls that should be in place to manage this risk. We have developed an algorithm to store cloud data using oblivious data structure defined in this paper. We have also implemented the ObliviCloudManager ap-plication that allows users to manage their cloud data by vali-dating it before storing it in an oblivious data structure. Our application uses role-based access control model and collection based document management to store and retrieve data effi-ciently. Cloud consumers can use our system to define policies for storing data obliviously and manage storage on untrusted cloud platforms even if they are unfamiliar with the underlying technology and concepts of oblivious data structures.Item Security and Privacy Challenges in Open and Dynamic Environments(IEEE, 2006-06-19) Kagal, Lalana; Finin, Tim; Greenspan, Sol; Joshi, AnupamInformation system security and privacy, once narrow topics primarily of interest to IS designers, have become critically important to society at large. The scope of associated challenges and applications is broadening accordingly, leading to new requirements and approaches. Information networks are evolving into more open and dynamic systems. Security and privacy enforcement is problematic in these systems due to the lack of a common understanding of requirements and information as well as user unpredictability. Shared ontologies, declarative policies, and trust models offer the most promising approaches to meet these challenges.Item Semantic Analytics on Social Networks: Experiences in Addressing the Problem of Conflict of Interest Detection(ACM, 2006-05-23) Aleman-Meza, Boanerges; Nagarajan, Meenakshi; Ramakrishnan, Cartic; Ding, Li; Kolari, Pranam; Sheth, Amit; Arpinar, Budak; Joshi, Anupam; Finin, TimIn this paper, we describe a Semantic Web application that detects Conflict of Interest relationships among potential reviewers and authors of scientific papers. This application discovers various "semantic associations" between the reviewers and authors in a populated ontology to determine a degree of Conflict of Interest. This ontology is built by integrating entities and relationships from two social networks, namely 'knows' from a FOAF (Friendof- a-Friend) social network, and 'co-author' from the underlying co-authorship network of the DBLP bibliography. We describe our experiences on development of this application in the context of a class of Semantic Web applications which have important research and engineering challenges in common. In addition, we present an evaluation of our approach for real-life COI detection.