344 resultados para Redes Peer-to-Peer

em Queensland University of Technology - ePrints Archive


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Peer to peer systems have been widely used in the internet. However, most of the peer to peer information systems are still missing some of the important features, for example cross-language IR (Information Retrieval) and collection selection / fusion features. Cross-language IR is the state-of-art research area in IR research community. It has not been used in any real world IR systems yet. Cross-language IR has the ability to issue a query in one language and receive documents in other languages. In typical peer to peer environment, users are from multiple countries. Their collections are definitely in multiple languages. Cross-language IR can help users to find documents more easily. E.g. many Chinese researchers will search research papers in both Chinese and English. With Cross-language IR, they can do one query in Chinese and get documents in two languages. The Out Of Vocabulary (OOV) problem is one of the key research areas in crosslanguage information retrieval. In recent years, web mining was shown to be one of the effective approaches to solving this problem. However, how to extract Multiword Lexical Units (MLUs) from the web content and how to select the correct translations from the extracted candidate MLUs are still two difficult problems in web mining based automated translation approaches. Discovering resource descriptions and merging results obtained from remote search engines are two key issues in distributed information retrieval studies. In uncooperative environments, query-based sampling and normalized-score based merging strategies are well-known approaches to solve such problems. However, such approaches only consider the content of the remote database but do not consider the retrieval performance of the remote search engine. This thesis presents research on building a peer to peer IR system with crosslanguage IR and advance collection profiling technique for fusion features. Particularly, this thesis first presents a new Chinese term measurement and new Chinese MLU extraction process that works well on small corpora. An approach to selection of MLUs in a more accurate manner is also presented. After that, this thesis proposes a collection profiling strategy which can discover not only collection content but also retrieval performance of the remote search engine. Based on collection profiling, a web-based query classification method and two collection fusion approaches are developed and presented in this thesis. Our experiments show that the proposed strategies are effective in merging results in uncooperative peer to peer environments. Here, an uncooperative environment is defined as each peer in the system is autonomous. Peer like to share documents but they do not share collection statistics. This environment is a typical peer to peer IR environment. Finally, all those approaches are grouped together to build up a secure peer to peer multilingual IR system that cooperates through X.509 and email system.

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Every day we hear someone complain that this or that patent should not have been granted. People complain that the patent system is now a threat to existing business and innovation be- cause the patent office grants with alarming regularity patents for inventions that are neither novel nor non-obvious. People argue that the patent office cannot keep up with the job of examining the backlog of hundreds of thousands of patents and that, even if it could, the large volumes of prior art literature that need to be considered each time a patent application is received make the decision as to whether a patent should be granted or not a treacherous one.

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Peer-to-Patent Australia will initially run as a 12 month pilot project designed to test whether an open community of reviewers can effectively locate prior art that might not otherwise be located by the patent office during a typical examination. Patent applications will be made available for peer review for a period of 6 months and there will follow a 6 month period of joint qualitative and quantitative assessment of the pilot project by IP Australia and QUT. The objective of Peer-to-Patent Australia is to improve the patent examination process and the quality of issued patents by utilising the knowledge and skills of experts in the broader community. It is a way of linking the scientific and technical expertise of anyone with an Internet connection with the expertise of a patent examiner. That community participation consists of members of the public reviewing patent applications and contributing relevant prior art references and comments within a web-based forum. The aim is to bring to light prior art, particularly non-patent prior art, that might otherwise not be identified by patent examiners. The better the prior art resources a patent examiner has at his or her disposal, the more likely a patent application will be assessed properly in terms of novelty and inventive step. The role of Peer-to-Patent Australia in this regard is to act as both a facilitator of discussion and a collector of prior art submissions. Peer-to-Patent Australia collects relevant prior art references on behalf of the reviewing community and forwards that prior art to IP Australia. Section 27 of the Patents Act 1990 (Cth) allows for the Commissioner of Patents to receive submissions of prior art by third parties relevant to the novelty and inventiveness of a particular patent application.

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This paper reports on the outcomes of a peer partnership program trialled at the Queensland University of Technology (QUT), Australia. The program was designed based on a community of practice methodology to bring together academic staff for the purpose of advancing teaching practice. The program encouraged professional and supportive environments for the purpose of critical reflection and personal development. The belief was that quality teaching is core business and vital to university organisational goals. Peer partnership programs support improvement in teaching and learning. Participants in the program reported the program enhanced their commitment and insight into teaching and that there is willingness to be involved if supported by colleagues and an organisation. Feedback from participants in the program was positive and outcomes arising from the QUT Peer Partnership Project were the development of an online peer partner tool-kit, staff development training, an instructional DVD and integration of the project goals within QUT staff development programs.

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While it is generally accepted in the learning and teaching literature that assessment is the single biggest influence on how students approach their learning, assessment methods within higher education are generally conservative and inflexible. Constrained by policy and accreditation requirements and the need for the explicit articulation of assessment standards for public accountability purposes, assessment tasks can fail to engage students or reflect the tasks students will face in the world of practice. Innovative assessment design can simultaneously deliver program objectives and active learning through a knowledge transfer process which increases student participation. This social constructivist view highlights that acquiring an understanding of assessment processes, criteria and standards needs active student participation. Within this context, a peer-assessed, weekly, assessment task was introduced in the first “serious” accounting subject offered as part of an undergraduate degree. The positive outcomes of this assessment innovation was that student failure rates declined 15%, tutorial participation increased fourfold, tutorial engagement increased six-fold and there was a 100% approval rating for the retention of the assessment task. In contributing to the core conference theme of “seismic” shifts within higher education, in stark contrast to the positive student response, staff-related issues of assessment conservatism and the necessity of meeting increasing research commitments, threatened the assessment task’s survival. These opposing forces to change have the potential to weaken the ability of higher education assessment arrangements to adequately serve either a new generation of students or the sector's community stakeholders.

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While it is generally accepted in the learning and teaching literature that assessment is the single biggest influence on how students approach their learning, assessment methods within higher education are generally conservative and inflexible. Constrained by policy and accreditation requirements and the need for the explicit articulation of assessment standards for public accountability purposes, assessment tasks can fail to engage students or reflect the tasks students will face in the world of practice. Innovative assessment design can simultaneously deliver program objectives and active learning through a knowledge transfer process which increases student participation. This social constructivist view highlights that acquiring an understanding of assessment processes, criteria and standards needs active student participation. Within this context, a peer-assessed, weekly, assessment task was introduced in the first “serious” accounting subject offered as part of an undergraduate degree. The positive outcomes of this assessment innovation was that student failure rates declined 15%, tutorial participation increased fourfold, tutorial engagement increased six-fold and there was a 100% approval rating for the retention of the assessment task. In contributing to the core conference theme of “seismic” shifts within higher education, in stark contrast to the positive student response, staff-related issues of assessment conservatism and the necessity of meeting increasing research commitments, threatened the assessment task’s survival. These opposing forces to change have the potential to weaken the ability of higher education assessment arrangements to adequately serve either a new generation of students or the sector's community stakeholders.

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Research Findings: The transition to school is a major developmental milestone, and behavior tendencies already evident at the point of school entry can impact upon a child's subsequent social and academic adjustment. The current study aimed to investigate stability and change in the social behavior of girls and boys across the transition from day care to 1st grade. Teacher ratings and peer nominations for prosocial and antisocial behavior were obtained for 248 children belonging to 2 cohorts: school transitioning (n = 118) and day care remaining (n = 130). Data were gathered again from all children 1 year later, following the older group's entry into school. Teacher ratings of prosocial and antisocial behavior significantly predicted teacher ratings of the same behavior at Time 2 for both cohorts. Peer reports of antisocial behavior also showed significant stability, whereas stability of peer-reported prosocial behavior varied as a function of behavior type. Practice or Policy: The results contribute to understanding of trends in early childhood social behavior that potentially influence long-term developmental trajectories. Identification of some behaviors as more stable in early childhood than others, regardless of school entry, provides useful information for both the type and timing of early interventions. © 2010 Taylor & Francis Group, LLC.