Diese Datenbank enthält über 40.000 Dokumente zu Themen aus den Bereichen Formalerschließung – Inhaltserschließung – Information Retrieval.
© 2015 W. Gödert, TH Köln, Institut für Informationswissenschaft / Powered by litecat, BIS Oldenburg (Stand: 04. Juni 2021)
1Su, S. ; Li, X. ; Cheng, X. ; Sun, C.: Location-aware targeted influence maximization in social networks.
In: Journal of the Association for Information Science and Technology. 69(2018) no.2, S.229-241.
Abstract: In this paper, we study the location-aware targeted influence maximization problem in social networks, which finds a seed set to maximize the influence spread over the targeted users. In particular, we consider those users who have both topic and geographical preferences on promotion products as targeted users. To efficiently solve this problem, one challenge is how to find the targeted users and compute their preferences efficiently for given requests. To address this challenge, we devise a TR-tree index structure, where each tree node stores users' topic and geographical preferences. By traversing the TR-tree in depth-first order, we can efficiently find the targeted users. Another challenge of the problem is to devise algorithms for efficient seeds selection. We solve this challenge from two complementary directions. In one direction, we adopt the maximum influence arborescence (MIA) model to approximate the influence spread, and propose two efficient approximation algorithms with math formula approximation ratio, which prune some candidate seeds with small influences by precomputing users' initial influences offline and estimating the upper bound of their marginal influences online. In the other direction, we propose a fast heuristic algorithm to improve efficiency. Experiments conducted on real-world data sets demonstrate the effectiveness and efficiency of our proposed algorithms.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23931/full.
2Tu, Y.-N. ; Hsu, S.-L.: Constructing conceptual trajectory maps to trace the development of research fields.
In: Journal of the Association for Information Science and Technology. 67(2016) no.8, S.2016-2031.
Abstract: This study proposes a new method to construct and trace the trajectory of conceptual development of a research field by combining main path analysis, citation analysis, and text-mining techniques. Main path analysis, a method used commonly to trace the most critical path in a citation network, helps describe the developmental trajectory of a research field. This study extends the main path analysis method and applies text-mining techniques in the new method, which reflects the trajectory of conceptual development in an academic research field more accurately than citation frequency, which represents only the articles examined. Articles can be merged based on similarity of concepts, and by merging concepts the history of a research field can be described more precisely. The new method was applied to the "h-index" and "text mining" fields. The precision, recall, and F-measures of the h-index were 0.738, 0.652, and 0.658 and those of text-mining were 0.501, 0.653, and 0.551, respectively. Last, this study not only establishes the conceptual trajectory map of a research field, but also recommends keywords that are more precise than those used currently by researchers. These precise keywords could enable researchers to gather related works more quickly than before.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23522/abstract.
Themenfeld: Informetrie ; Data Mining
3Su, S.-F. ; Lancaster, F.W.: Evaluation of expert systems in reference service applications.
In: RQ. 35(1995) no.2, S.219-228.
Abstract: Reports results of an evaluation of 2 expert systems designed for use in library reference services: ReferenceExpert (RE), developed by Houston University; and SourceFinder (SF), developed by Illinois University at Urbana-Champaign. The test group consisted of 60 graduate students at the initial stage of an intermediate level reference course. The evaluation involved test questions already used in an earlier study (College and research libraries 52(1991) no.5, S.454-465). Results indicated that: there was no significant difference between RE and SF students in the confidence they expressed regarding understanding of their test questions; no significant correlation was found between confidence in understanding the question and success in selecting appropriate sources; only 1/5 of the students agreed that the system they used could be considered 'intelligent'; the majority did not consider the system they used to be 'competent'; almost half agreed that the subject categories provided by the menus were too broad; a little more than half wer not satisfied with the information sources selected by their system; significantly more RE users than SF users agreed that they found the menu interface useful; and a keyword search capability was the feature most often mentioned as a needed system enhancement. Overall results indicated that current expert systems for the selection of reference sources cannot perform as well as experienced subject oriented reference librarians
Objekt: Reference Expert ; SubjectFinder
4Su, S.-F.: Dialogue with an OPAC : how visionary was Swanson in 1964?.
In: Library quarterly. 64(1994) no.2, S.130-161.
Abstract: In 1964 Swanson published an article 'Dialogues with a catalog', in which he presented a personal prescription for what a library catalog should look like at some future date. He was in many ways remarkably visionary; some of the features he recommended have still not been implemented, although writers are again referring to their desirability. Despite its visionary qualities, Swanson's article seems to have been quite forgotten. At least, it is rarely cited. This article will trace the development of OPACs from the time they were first introduced into libraries and compare what has occured with Swanson's recommendations. It is remarkable that an article written thirty years ago could still offer a suitable framework within which to review virtually the totality of OPAC developments. The lesson that emerges most clearly from this is that the library profession should prescribe performance goals for tools and services that are not constrained by existing technologies. We must first establish requirements and seek the solutions later
Anmerkung: Bezugnahme auf: Swanson, D.R.: Dialogues with a catalog. In: Library quarterly 34(1964) S.113-125
Themenfeld: OPAC ; Geschichte der Sacherschließung