Real time search on the web: Queries,topics, and economic value     

Bernard J. Jansen  Zhe Liu  Courtney Weaver  Gerry Campbell  Matthew Gregg 《Information processing & management》2011

Real time search is an increasingly important area of information seeking on the Web. In this research, we analyze 1,005,296 user interactions with a real time search engine over a 190 day period. Using query log analysis, we investigate searching behavior, categorize search topics, and measure the economic value of this real time search stream. We examine aggregate usage of the search engine, including number of users, queries, and terms. We then classify queries into subject categories using the Google Directory topical hierarchy. We next estimate the economic value of the real time search traffic using the Google AdWords keyword advertising platform. Results shows that 30% of the queries were unique (used only once in the entire dataset), which is low compared to traditional Web searching. Also, 60% of the search traffic comes from the search engine’s application program interface, indicating that real time search is heavily leveraged by other applications. There are many repeated queries over time via these application program interfaces, perhaps indicating both long term interest in a topic and the polling nature of real time queries. Concerning search topics, the most used terms dealt with technology, entertainment, and politics, reflecting both the temporal nature of the queries and, perhaps, an early adopter user-based. However, 36% of the queries indicate some geographical affinity, pointing to a location-based aspect to real time search. In terms of economic value, we calculate this real time search stream to be worth approximately US $33,000,000 (US $33 M) on the online advertising market at the time of the study. We discuss the implications for search engines and content providers as real time content increasingly enters the main stream as an information source.  相似文献   

Mohenjo-Daro, city of the Indus Valley     

Michaël Jansen M.A.  Ph.D. 《Endeavour》1985,9(4):161-169

The Harappan civilization, the world's fourth great civilization after those of Egypt, Mesopotamia, and China flourished in the valley of the Indus three thousand years ago. As yet little is known about it, but one enormous town — Mohenjo-Daro — has survived. This has been only partially excavated and has yielded just a few scraps of information which have provided the basis for some fanciful theories. The author of this article had developed an interesting new approach. Combining a re-examination of the documentation that has accumulated over the past 50 years with an investigation of the actual remains, he has obtained some exciting results which shed new light on the overall planning, architecture, and development of the town over the centuries, thus providing a fresh understanding of the Harappan civilization itself.  相似文献   

Functioning and participation problems of students with ASD in higher education: which reasonable accommodations are effective?     

Dorien Jansen  Katja Petry  Eva Ceulemans  Ilse Noens  Dieter Baeyens 《欧洲特需教育杂志》2017,32(1):71-88

Abstract

Students with autism spectrum disorder (ASD) experience various functioning and participation problems in higher education, which may cause difficulties such as drop out or low grade point averages. However, it remains unclear how often and during which teaching and evaluation methods the functioning and participation problems occur and which reasonable accommodations are effective in dealing with them. These gaps in the literature are addressed in this survey-based study. In total, 43 students with ASD, 30 student counsellors and 43 students without a disability of institutions of higher education in Flanders (Belgium) participated in the study. The results show that students with ASD most frequently experience problems with verbal and non-verbal communication, are oversensitive to change and have difficulty distinguishing the gist of the syllabus from the details. Furthermore, it is shown that, on average, these problems arise mostly during classical teaching and evaluation methods. Finally, the perceived effectiveness of reasonable accommodations is dependent on the functioning and participation problem experienced by the student with ASD in higher education. In conclusion, both personal and environmental characteristics should be taken into account when selecting and implementing reasonable accommodations for these students.  相似文献   

Self-Actualization of Clergymen Rated High and Low in Clinical Competencies     

David G. Jansen  Frank J. Garvey 《Counselor Education & Supervision》1974,13(4):298-302

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Gender and the expansion of university education in Jordan     

Willy Jansen 《Gender and education》2006,18(5):473-490

This article explores how gender is threaded through the expansion and privatization of higher education in Jordan. Due to the justified current concern with the educational deficit of Muslim girls, it is easy to overlook the educational advances made by girls in some Islamic countries. In Jordan, girls have profited more than boys from the expansion of higher education. Economic or political reasons cannot explain this change, so explanations for the advancement of girls in the universities have to be sought elsewhere. I argue here that, for Jordan, this female advancement is linked to the commercialization of education set in motion by the early mission schools, the re‐Islamization of society, and the prestige system of ‘culturedness’. For this article, I have drawn upon qualitative anthropological data gathered through interviews with students, staff and parents in Jordan and from an analysis of higher education statistics.  相似文献   

Schulformwechsel im zweigliedrigen Schulsystem     

Ricarda Albrecht  Marko Neumann  Malte Jansen  Michael Becker  Kai Maaz  Jürgen Baumert 《Zeitschrift für Erziehungswissenschaft》2018,21(4):839-865

This study focuses on students who change from the academic to the non-academic school track after grade 7 (probationary year) in Berlin. We examined which individual student characteristics (e.?g., performance, school biography, family background) predict school change after the probationary year. We were particularly interested as to whether there are secondary effects of social background, after controlling for differences in performance. Our analyses were based on data from a study which included a whole cohort of school track changers (N?=?754) who were compared with students that remained at the academic track (N?=?1470). In order to predict the change of school type, multivariate logistic regression analyses were performed. Results revealed significant differences between both groups regarding all observed characteristics. Performance-related characteristics were the best predictors of track change. After controlling for these characteristics, no further significant effects for other predictors were observable (i.?e., no secondary effects of social background were present).  相似文献   

Reflections on Transformative Experiences with Mathematical Inquiry: The Case of Christine     

Alfinio Flores  Christine M. Phelps  Amanda Jansen 《PRIMUS》2017,27(1):47-57

Abstract

We present a first-hand, longer-term account of one student’s (Christine’s) experiences in and after a mathematics inquiry course. In this course, students actively posed problems, conducted their own mathematical explorations, and wrote journal entries about their experiences. During the course, Christine found that inquiry helped her develop mathematical content knowledge and a deeper understanding of the nature of research. After the course, Christine became a mathematics education faculty member in a mathematics department and reports that the course impacted the way she teaches mathematics. This provides an illustrative case of the potential long-lasting benefits of an inquiry course.  相似文献   

Phonemic awareness and learning to read     

Beck  Manfred  Jansen  Heiner  R&#;ting  Corinna 《European Journal of Psychology of Education - EJPE》1988,3(1):48-50

European Journal of Psychology of Education -  相似文献   

Assessing students’ understanding of models of biological processes: a revised framework     

Susanne Jansen  Marie-Christine P. J. Knippels  Wouter R. van Joolingen 《International Journal of Science Education》2019,41(8):981-994

Models are very important tools when learning and communicating about science. Models used in secondary school biology education range from concrete scale models, such as a model of a skeleton, to abstract concept-process models, such as a visualisation of meiosis. Understanding these concept-process models requires a profound understanding of the concept of models and how they are used in biology. This study evaluates an existing framework for its use in assessing students’ understanding of biological concept-process models. Four additions were required to extend the applicability of the framework to concept-process models. We were also able to give an indication of students’ current level of understanding of these models, showing room for improvement in all aspects of understanding. Since concept-process models have a central place in many scientific disciplines, it is important that students have a deep understanding of the nature, application and limitations of these models. The current study contributes to assessing the way students reason with concept-process models. Knowing how to improve students’ view on the use of concept-process models in biology may lead to higher scientific literacy.  相似文献   

Chemical-warfare techniques for insect control: insect 'pests' in Germany before and after World War I     

Jansen S 《Endeavour》2000,24(1):28-33

During World War I, chemical-warfare practices were introduced into economic entomology in Germany. Fritz Haber, 'the father of chemical warfare', realized that Germany could not win the war and thus looked for 'civilian' uses for his chemical arsenal. Before the war, there was a rhetoric of dangerous 'masses' of insects but the large-scale techniques needed to deal with them had not been developed. The gap between rhetoric and practices enabled entomology to integrate chemical weapons into its working methods. This article traces transformations in the ways of seeing insects and their control from the mid-nineteenth century to after World War I.  相似文献