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Browsing Artikler, rapporter og annet (informatikk) by Author
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Now showing items 61-76 of 76
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Skotnes, Harald; Hartvigsen, Gunnar; Johansen, Dag (Research report; Forskningsrapport, Sep-1994)[+][-]
Abstract: Advances in computing power and graphics have increased the use of graphics in weather forecasting. This includes 3D animation sequences and geographical information systems. The paper addresses the main problems and presents preliminary results of the visualization of atmospheric models in conjunction with the underlying topography. The goal is among others to make a sort of 3D satellite pictures that present the weather described by the gridpoints in an atmospheric model, i.e., the weather of tomorrow. URI: http://hdl.handle.net/10037/401 File(s) in this item: 1
report.pdf (50.11Kb) -
Skrøvseth, Stein Olav; Årsand, Eirik; Godtliebsen, F.; Hartvigsen, Gunnar (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)[+][-]
Abstract: Persons with type 1 diabetes who use electronic self-help tools, most commonly blood glucose meters, record a large amount of data about their personal condition. Mobile phones are powerful and ubiquitous computers that have a potential for data analysis, and the purpose of this study is to explore how self-gathered data can help users improve their blood glucose management. Thirty patients with insulin-regulated type 1 diabetes were equipped with a mobile phone application for 3–6 months, recording blood glucose, insulin, dietary information, physical activity, and disease symptoms. The data were analyzed in terms of usage of the different modules and which data processing and visualization tools could be constructed to support the use of these data. Eighteen patients (denoted “adopters”) recorded complete data for over 80 consecutive days, up to 247 days. Among those who withdrew or did not use the application extensively, the most common reasons given were outdated or difficult-to-use phone. Data analysis using period finding and scale-space trends was found to yield significant patterns for most adopters. Pattern recognition methods to predict low or high blood glucose were found to be performing poorly. Minimally intrusive mobile applications enable users with type 1 diabetes to record data that can provide data-driven feedback to the user, potentially providing relevant insight into their disease. URI: http://hdl.handle.net/10037/4570 File(s) in this item: 1
article.pdf (686.5Kb) -
Stabell-Kulø, Tage; Bottoni, Andrea (Research report; Forskningsrapport, 17-May-2003)[+][-]
Abstract: Authentication in Distributed Systems: Theory and Practice provides considerable insight. However, it can be hard to read, as many details are left out, probably for brevity; it is still 45 pages long. We provide detailed explanations of tricky points. Description: Publisert 2. november 1995, revidert 17. mai 2003 / Published 1995, revised 2003 URI: http://hdl.handle.net/10037/359 File(s) in this item: 1
report.pdf (181.6Kb) -
Stabell-Kulø, Tage (Research report; Forskningsrapport, Feb-1995)[+][-]
Abstract: To ensure privacy, users of the File Repository Transfer Protocol (Frtp) may require that communication partners are properly authenticated. If one partner wants the communication to be crypted, the other must honor the request. This report describes how authentication and privacy are realized. It is shown, by means of an authentication logic, that the protocol achives its goal in this respect. URI: http://hdl.handle.net/10037/389 File(s) in this item: 1
report.pdf (261.7Kb) -
Stabell-Kulø, Tage (Research report; Forskningsrapport, Feb-1995)[+][-]
Abstract: This document presents and specifies the protocol that interfaces clients and servers in the File Repository (FR). The FR is a software system that supports sharing of files. The protocol is modelled after Smtp and Nntp and is encoded in Ascii. No details of server implementation is visible in the protocol description, but we state our intentions at several occasions. URI: http://hdl.handle.net/10037/387 File(s) in this item: 1
report.pdf (252.4Kb) -
Stabell-Kulø, Tage (Research report; Forskningsrapport, 04-Feb-1997)[+][-]
Abstract: This paper presents the system model for the work on security in the Pasta project. We present the objectives of the security effort, the threats we will consider, and those we will not consider. As such, the paper describes the environment which applications must be prepared to face, and still provide users with the desired degree of privacy. Description: Publisert 15. oktober 1996, revidert 4. februar 1997 / Published Octobre 1996, revised February 1997 URI: http://hdl.handle.net/10037/377 File(s) in this item: 1
report.pdf (84.79Kb) -
Stødle, Daniel; Hagen, Tor-Magne Stien; Bjørndalen, John Markus; Anshus, Otto (Journal article; Tidsskriftartikkel; Peer reviewed, 2008)[+][-]
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Sudmann, Nils P.; Johansen, Dag (Research report; Forskningsrapport, 2000)[+][-]
Abstract: In this paper we will show that it is possible to combine mobile agent technology with existing non-mobile data mining applications. The motivation for this is the advantage mobile agents offer in moving the computation closer to the data in a distributed system. This can save bandwidth and increase performance when the data is condensed as a result of data mining. URI: http://hdl.handle.net/10037/357 File(s) in this item: 1
report.pdf (70.91Kb) -
Sudmann, Nils P.; Johansen, Dag (Research report; Forskningsrapport, 11-Jan-2001)[+][-]
Abstract: For the past seven years, the TACOMA project has investigated software support for mobile agents. Several prototypes have been developed, with experiences in distributed applications directing the effort. This paper presents a new mechanism that supports implementing agent applications by creating troops of agents using wrappers. This solution requires little extra support from the agent system, and may be used to construct applications with a wide variety of functionality requirements. URI: http://hdl.handle.net/10037/402 File(s) in this item: 1
report.pdf (206.0Kb) -
Weihei, Yu; Yang, Jie (Research report; Forskningsrapport, 2006)[+][-]
Abstract: Scalability, reliability and adaptability are among the key requirements for the enactment of distributed workflows. In addition, system resources should be efficiently utilized. Central workflow engines and static analysis of workflow specifications are some of the important obstacles to meeting these requirements. We propose a fully decentralized approach to workflow enactment that is not subject to these obstacles. In addition, it supports automatic recovery. The approach is of continuation-passing style, where continuations, or the reminder of the executions, are passed along with asynchronous messages for workflow enactment. Two continuations are associated to an execution: a success continuation and a failure continuation. Recovery plans for workflows are automatically generated at runtime and included in failure continuations. A prototype is implemented. URI: http://hdl.handle.net/10037/398 File(s) in this item: 1
report.pdf (229.2Kb) -
Wong, Aaron K.; Park, Christopher Y.; Greene, Casey S.; Bongo, Lars Ailo; Guan, Yuanfang; Troyanskaya, Olga (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)[+][-]
Abstract: Integrative multi-species prediction (IMP) is an interactive web server that enables molecular biologists to interpret experimental results and to generate hypotheses in the context of a large cross-organism compendium of functional predictions and networks. The system provides a framework for biologists to analyze their candidate gene sets in the context of functional networks, as they expand or focus these sets by mining functional relationships predicted from integrated high-throughput data. IMP integrates prior knowledge and data collections from multiple organisms in its analyses. Through flexible and interactive visualizations, researchers can compare functional contexts and interpret the behavior of their gene sets across organisms. Additionally, IMP identifies homologs with conserved functional roles for knowledge transfer, allowing for accurate function predictions even for biological processes that have very few experimental annotations in a given organism. IMP currently supports seven organisms (Homo sapiens, Mus musculus, Rattus novegicus, Drosophila melanogaster, Danio rerio, Caenorhabditis elegans and Saccharomyces cerevisiae), does not require any registration or installation and is freely available for use at http://imp.princeton.edu. URI: http://hdl.handle.net/10037/4962 File(s) in this item: 1
article.pdf (9.089Mb) -
Blair, Gordon S.; Yang, Jie; Andersen, Anders (Research report; Forskningsrapport, 2005)[+][-]
Abstract: It is becoming clear that modern middleware platforms must provide both deploy-time configuration and run-time reconfiguration to accommodate rapid changing requirements and also to be able to operate in dynamic environments. J2EE is a key example of a middleware architecture that supports enterprise applications via its Enterprise JavaBeans (EJB) component model. EJB provides limited configurability in terms of a fixed set of non-functional middleware services at deployment-time (via a declarative deployment descriptor). However, EJB along with other related enterprise architectures generally do not provide enough support for re-configuration or evolution. At best, there is limited support in some platforms for replacing or updating particular services. This paper discusses the design of configurable and re-configurable middleware architecture and also the key role of separation of concerns for such platforms. The paper also describes the Arctic Beans component model which uses the Composition Filters model to capture such concerns and also support their safe composition.The paper also explains how this model can be used to construct an Arctic Beans container, in the style of EJB. The main contribution of the paper is to demonstrate that adaptable middleware platform can be developed using separation of concern technologies, specifically the composition filters model. URI: http://hdl.handle.net/10037/396 File(s) in this item: 1
report.pdf (335.0Kb) -
Yom-Tov, Elad; Fernandez Luque, Luis; Weber, Ingmar; Crain, Steven P. (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)[+][-]
Abstract: There is widespread use of the Internet to promote anorexia as a lifestyle choice. Pro-anorexia content can be harmful for people affected or at risk of having anorexia. That movement is actively engaged in sharing photos on social networks such as Flickr. Objective: To study the characteristics of the online communities engaged in disseminating content that encourages eating disorders (known as “pro-anorexia”) and to investigate if the posting of such content is discouraged by the posting of recovery-oriented content. The extraction of pro-anorexia and pro-recovery photographs from the photo sharing site Flickr pertaining to 242,710 photos from 491 users and analyzing four separate social networks therein. Pro-anorexia and pro-recovery communities interact to a much higher degree among themselves than what is expected from the distribution of contacts (only 59-72% of contacts but 74-83% of comments are made to members inside the community). Pro-recovery users employ similar words to those used by pro-anorexia users to describe their photographs, possibly in order to ensure that their content appears when pro-anorexia users search for images. Pro-anorexia users who are exposed to comments from the opposite camp are less likely to cease posting pro-anorexia photographs than those who do not receive such comments (46% versus 61%), and if they cease, they do so approximately three months later. Our observations show two highly active communities, where most interaction is within each community. However, the pro-recovery community takes steps to ensure that their content is visible to the pro-anorexia community, both by using textual descriptions of their photographs that are similar to those used by the pro-anorexia group and by commenting to pro-anorexia content. The latter activity is, however, counterproductive, as it entrenches pro-anorexia users in their stance. Our results highlight the nature of pro-anorexia and pro-recovery photo sharing and accentuate the need for clinicians to be aware of such content and its effect on their patients. Our findings suggest that some currently used interventions are not useful in helping pro-anorexia users recover. Thus, future work should focus on new intervention methods, possibly tailored to individual characteristics. URI: http://hdl.handle.net/10037/5053 File(s) in this item: 1
article.pdf (369.0Kb) -
Zagorodnov, Dmitrii; Johansen, Dag (Research report; Forskningsrapport, 2004)[+][-]
Abstract: Events injected by publishers into a publish/subscribe system may reach users through a variety of devices: a stationary desktop, a laptop, a mobile phone, etc. We argue that the "last hop" -- from the network to the output device -- has unique properties, owing to the mobile nature of these devices, and as such demands special consideration. In particular, user's preferences and location may limit what should be forwarded to a device. Furthermore, technological constraints, such as network bandwidth availability and battery power, suggest that the decision when to forward messages is also important for optimizing user's experience. We describe a new publish/subscribe system with volume-limiting mechanisms and explain how user preferences, context, and device constraints can be accommodated in such a system. Notably, based on results of simulations, we propose a simple algorithm for low-cost "prefetching" of notifications to mobile devices in cases when network bandwidth is insufficient. URI: http://hdl.handle.net/10037/380 File(s) in this item: 1
report.pdf (183.5Kb) -
Zagorodnov, Dmitrii (Research report; Forskningsrapport, 2005)[+][-]
Abstract: The main purpose of this paper is to illuminate two types of unwanted traffic in a publish/subscribe system -- malicious (spam, DoS attacks) and vain (unused events) -- and suggest a general mechanism for minimizing their effects. We do this by augmenting the classic publish/subscribe interface with volume-limiting parameters -- a combination of attributes assigned to events by publishers and thresholds specified by subscribers -- and consider the implications of this interface on the unwanted traffic and on the routing infrastructure. Notably, we observe that this mechanism can minimize unwanted traffic without total access control if the routing substrate supports two properties: flow control and routing integrity. URI: http://hdl.handle.net/10037/386 File(s) in this item: 1
report.pdf (35.97Kb) -
Marzullo, Keith; Zagorodnov, Dmitrii; Alvisi, Lorenzo; Bressoud, Thomas C. (Research report; Forskningsrapport, 25-Aug-2005)[+][-]
Abstract: This article describes an architecture that allows a replicated service to survive crashes without breaking its TCP connections. Our approach does not require modifications to the TCP protocol, to the operating system on the server, or to any of the software running on the clients. Furthermore, it runs on commodity hardware. We compare two implementations of this architecture – one based on primary/backup replication and another based on message logging – focusing on scalability, failover time, and application transparency. We evaluate three types of services: a file server, a web server, and a multimedia streaming server. Our experiments suggest that the approach incurs low overhead on throughput, scales well as the number of clients increases, and allows recovery of the service in near-optimal time. URI: http://hdl.handle.net/10037/388 File(s) in this item: 1
report.pdf (296.0Kb)
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