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Search Results: 1 - 10 of 203469 matches for " Christian Gütl "
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Moving towards a Fully Automatic Knowledge Assessment Tool
Christian Gütl
International Journal of Emerging Technologies in Learning (iJET) , 2008,
Abstract: Information about a student’s level or state ofknowledge is a key aspect for efficient, personalized learningactivities. E-learning systems gain such information in twoways: directly by examining users’ self-assessment andadministering predefined tests and indirectly by makinginferences on observed user behaviors. However, most of thecurrent solution approaches either demand excessivemanpower or lack required reliability. To overcome theseproblems, we have developed the e-Examiner, an assessmenttool that supports the assessment process by creatingautomatically test items, assessing students’ answers andproviding feedback. In this paper, we firstly give anoverview about a variety of computer-assisted andcomputer-based assessment systems and methods thatsupport formative assessment activities. Secondly, weintroduce the overall concept and architecture of the e-Examiner. Thirdly, we outline implementation details andevaluation results of our prototype implementation. Oursolution approach is based on the set of statistical similaritymeasures defined by the ROUGE toolset for automaticsummary evaluation.This paper is an extended version of the IMCL 2007 paper.
Seamless Integration of RESTful Services into the Web of Data
Markus Lanthaler,Christian Gütl
Advances in Multimedia , 2012, DOI: 10.1155/2012/586542
Abstract: We live in an era of ever-increasing abundance of data. To cope with the information overload we suffer from every single day, more sophisticated methods are required to access, manipulate, and analyze these humongous amounts of data. By embracing the heterogeneity, which is unavoidable at such a scale, and accepting the fact that the data quality and meaning are fuzzy, more adaptable, flexible, and extensible systems can be built. RESTful services combined with Semantic Web technologies could prove to be a viable path to achieve that. Their combination allows data integration on an unprecedented scale and solves some of the problems Web developers are continuously struggling with. This paper introduces a novel approach to create machine-readable descriptions for RESTful services as a first step towards this ambitious goal. It also shows how these descriptions along with an algorithm to translate SPARQL queries to HTTP requests can be used to integrate RESTful services into a global read-write Web of Data. 1. Introduction We live in an era where exabytes of data are produced every single year; never before in human history had we to deal with such an abundance of information. To cope with this information overload, more sophisticated methods are required to access, manipulate, and analyze these humongous amounts of data. Service-oriented architectures (SOAs) built on Web services were a first attempt to address this issue, but the utopian promise of uniform service interface standards, metadata, and universal service registries, in the form of SOAP, WSDL, and UDDI has proven elusive. This and other centralized, registry-based approaches were overwhelmed by the Web’s rate of growth and the lack of a universally accepted classification scheme. In consequence, the usage of SOAP-based services is mainly limited to company-internal systems and to the integration of legacy systems. In practice, however, such a clear and crisp definition of data is rare. Today’s systems integrate data from many sources. The data quality and meaning are fuzzy and the schema, if present, are likely to vary across the different sources. In very large and loosely coupled systems, such as the Internet, the gained adaptability, flexibility, and extensibility, in a transition away from strict and formal typing to simple name/value pairs or triples, outweighs the resulting loss off “correctness.” Thus, it is not surprising that RESTful services, and there especially the ones using the lightweight JavaScript Object Notation (JSON) [1] as the serialization format, are increasingly
Evaluation of Collaborative Learning Settings in 3D Virtual Worlds
Vanessa Chang,Christian Gütl,Simone Kopeinik,Robert Williams
International Journal of Emerging Technologies in Learning (iJET) , 2009, DOI: 10.3991/ijet.v4s3.1112
Abstract: Virtual 3D worlds are gaining popularity among the general population and the virtual world environment is widely used particularly by the younger generations as a knowledge and social tool. In recent years, universities have conducted experiments with the use of virtual 3D worlds for teaching and learning. Virtual 3D worlds are no longer just for the stereotypical geek. By 2011 it is estimated that about 80% of active Internet users will have an “avatar” and/or a “second life” in some form of virtual world environment. This paper attempts to contextualize the evolution and generations of learners for learning in the 21st century. This paper presents a virtual learning environment created using Second Life equipped with four types of virtual space – collaborative area, common area, teacher-student meeting area, and social recreation area. An experiment is conducted involving university students who are enrolled in a unit with the aim of evaluating the use of Second Life for collaborative learning. A pre-survey evaluation was gathered followed by a post-survey evaluation. The positive results of these evaluations as well as lessons learned during the implementation phase are discussed in this paper.
Towards a Standardized e-Assessment System: Motivations, Challenges and First Findings
Mohammad AL-Smadi,Christian Gütl,Denis Helic
International Journal of Emerging Technologies in Learning (iJET) , 2009, DOI: 10.3991/ijet.v4s2.919
Abstract: “Global Learning” with shared learning contents, resources, activities and goals is one of the contributions of Globalization. With the capability to use new Information and Communication Technologies (ICT) it is a bit easier to have a technology based learning systems that enable learners to share the learning resources and possibilities. As a result many Learning Management Systems (LMS) were developed with divers of platforms and approaches. Consequently, sharing learning resources and components has become a major challenge. E-assessment as a primary activity of any LMS is facing the same challenges and problems. In order to stand on this challenge people in the field of technology enhanced learning have recommended that LMS should conform to specific standards. This paper discuses this challenge, the consequences and limitations of standards in the modern learning settings. Moreover, it shows a service oriented framework for assessment which aims to make the e-assessment systems flexible and also to initiate the term of “Global Learning Assessment” with the possibility of sharing the e-assessment system components.
Assessment for Complex Learning Resources: Development and Validation of an Integrated Model
Gudrun Wesiak,Mohammad AL-Smadi,Margit H?fler,Christian Gütl
International Journal of Emerging Technologies in Learning (iJET) , 2013, DOI: 10.3991/ijet.v8is1.2354
Abstract: Today’s e-learning systems meet the challenge to provide interactive, personalized environments that support self-regulated learning as well as social collaboration and simulation. At the same time assessment procedures have to be adapted to the new learning environments by moving from isolated summative assessments to integrated assessment forms. Therefore, learning experiences enriched with complex didactic resources - such as virtualized collaborations and serious games - have emerged. In this extension of [1] an integrated model for e-assessment (IMA) is outlined, which incorporates complex learning resources and assessment forms as main components for the development of an enriched learning experience. For a validation the IMA was presented to a group of experts from the fields of cognitive science, pedagogy, and e-learning. The findings from the validation lead to several refinements of the model, which mainly concern the component forms of assessment and the integration of social aspects. Both aspects are accounted for in the revised model, the former by providing a detailed sub-model for assessment forms.
Collaborative Virtual 3D Environment for Internet-Accessible Physics Experiments
Bettina Scheucher,Philip H. Bailey,Christian Gütl,Judson V. Harward
International Journal of Online Engineering (iJOE) , 2009, DOI: 10.3991/ijoe.v5i5.1014
Abstract: —Immersive 3D worlds have increasingly raised the interest of researchers and practitioners for various learning and training settings over the last decade. These virtual worlds can provide multiple communication channels between users and improve presence and awareness in the learning process. Consequently virtual 3D environments facilitate collaborative learning and training scenarios. In this paper we focus on the integration of internet-accessible physics experiments (iLabs) combined with the TEALsim 3D simulation toolkit in Project Wonderland, Sun's toolkit for creating collaborative 3D virtual worlds. Within such a collaborative environment these tools provide the opportunity for teachers and students to work together as avatars as they control actual equipment, visualize physical phenomenon generated by the experiment, and discuss the results. In particular we will outline the steps of integration, future goals, as well as the value of a collaboration space in Wonderland's virtual world.
Karst geology and cave fauna of Austria: a concise review
Erhard Christian,Christoph Sp?tl
International Journal of Speleology , 2010,
Abstract: The state of cave research in Austria is outlined from the geological and zoological perspective. Geologic sections include the setting of karst regions, tectonic and palaeoclimatic control on karst, modern cave environments, and karst hydrology. A chapter on the development of Austrian biospeleology in the 20th century is followed by a survey of terrestrial underground habitats, biogeographic remarks, and an annotated selection of subterranean invertebrates.
Alpine permafrost thawing during the Medieval Warm Period identified from cryogenic cave carbonates
M. Luetscher,M. Borreguero,G. E. Moseley,C. Sp?tl
The Cryosphere Discussions , 2013, DOI: 10.5194/tcd-7-419-2013
Abstract: Coarse crystalline cryogenic cave carbonates (CCCcoarse) dated to the last glacial period are common in central European caves and provide convincing evidence of palaeo-permafrost during this time. Little is known, however, about the exact nature of the environment in which CCCcoarse formed as no modern analogue setting is known. Here, we report the first findings of sub-recent, albeit inactive, CCCcoarse from a cave of the Western Alps which is located in the present-day permafrost zone. The globular shape and the presence of ubiquitous euhedral crystal terminations are comparable to previously described aggregates from the last glacial period and strongly suggest that these aggregates formed subaqueously in pools lacking agitation. Furthermore, stable isotope values of mm-sized spheroids point to calcite precipitation in a closed system with respect to CO2 strongly supporting the hypothesis of a cryogenic origin associated with the freezing of water ponds. U-series analyses revealed three clusters of late Holocene calcite precipitation intervals between 2129 and 751 a b2k. These ages correlate with known periods of elevated summer temperatures, suggesting that warming and thawing of the permafrozen catchment above the cave allowed water infiltration into the karst system. The growth of CCCcoarse resulted from the re-freezing of this water in the still cold karst cavities.
Evaluation of energy and dietary intake estimates from a food frequency questionnaire using independent energy expenditure measurement and weighed food records
Monica H Carlsen, Inger TL Lillegaard, Anette Karlsen, Rune Blomhoff, Christian A Drevon, Lene F Andersen
Nutrition Journal , 2010, DOI: 10.1186/1475-2891-9-37
Abstract: Energy intake was evaluated against independent measures of energy expenditure using the ActiReg? system (motion detection), whereas 7-days weighed food records were used to study the relative validity of food and nutrient intake. The relationship between methods was investigated using correlation analyses and cross-classification of participants. The visual agreement between the methods was evaluated using Bland-Altman plots.We observed that the FFQ underestimated the energy intake by approximately 11% compared to the energy expenditure measured by the ActiReg?. The correlation coefficient between energy intake and energy expenditure was 0.54 and 32% of the participants were defined as under-reporters. Compared to the weighed food records the percentages of energy from fat and added sugar from the FFQ were underestimated, whereas the percentage of energy from total carbohydrates and protein were slightly overestimated. The intake of foods rich in antioxidants did not vary significantly between the FFQ and weighed food records, with the exceptions of berries, coffee, tea and vegetables which were overestimated. Spearman's Rank Order Correlations between FFQ and weighed food records were 0.41 for berries, 0.58 for chocolate, 0.78 for coffee, 0.61 for fruit, 0.57 for fruit and berry juices, 0.40 for nuts, 0.74 for tea, 0.38 for vegetables and 0.70 for the intake of wine.Our new FFQ provides a good estimate of the average energy intake and it obtains valid data on average intake of most antioxidant-rich foods and beverages. Our study also showed that the FFQs ability to rank participants according to intake of total antioxidants and most of the antioxidant-rich foods was good.Assessment of long-term dietary intake using methods of self-reporting has generally been associated with measurement errors [1]. Methods used challenges the participants' memory and ability to take into account the variability in intake, from day to day or by season. Because of the measurement er
Emerging treatment options for patients with recurrent advanced thymic epithelial tumors
Evans TL
OncoTargets and Therapy , 2012, DOI: http://dx.doi.org/10.2147/OTT.S23267
Abstract: ging treatment options for patients with recurrent advanced thymic epithelial tumors Review (824) Total Article Views Authors: Evans TL Published Date September 2012 Volume 2012:5 Pages 177 - 184 DOI: http://dx.doi.org/10.2147/OTT.S23267 Received: 17 April 2012 Accepted: 20 June 2012 Published: 07 September 2012 Tracey L Evans Abramson Cancer Center, University of Pennsylvania, Philadelphia, PA, USA Abstract: The purpose of this review article is to review recent advances in the treatment of advanced thymic epithelial tumors. These tumors are generally responsive to cytotoxic combination chemotherapy in the first-line setting. While newer agents have shown efficacy in the salvage setting, there is no one standard approach. A multitude of targeted agents have shown promise generally in case reports, though as of yet, nothing has shown consistent benefit. Because of the rarity of thymic epithelial tumors, clinical trial enrollment is difficult but nevertheless essential.
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