121 research outputs found
Cooperation bibliogram of bird flu
No full textThe published literature on Bird Flu, now a pandemic animal disease with a possible potential of evolving into a devastating human disease, was analysed primarily with respect of national and international cooperations and networks of authors and countries. The output of research-relevant papers is now around 150 per year and was less than 100 papers per year before 2003. The field is highly cooperative; nearly 90% of the articles have two or more authors. National extramural cooperation is around 50% since 1998, intramural cooperation shows a decreasing tendency and is now about 20%. Between 20% and 30% of the papers have been published in bi- or multinational cooperation. Observed and expected citation rates of international papers are twice as high as the citation rates of national papers.
47 countries are engaged in Bird Flu research, on top USA, followed by PEOPLES R CHINA, UK and JAPAN. These countries are also centers of country networks, but minor centers exist. An Asian local network with strong ties consisting of countries most affected by Bird Flu can be identified.. No strong direct connections exist between Europe and Asia; thus it seems necessary to intensify international cooperation.
Author network show interesting cluster structures which must be studied in detail
Citation rates, knowledge export and international visibility of dermatology journals listed and not listed in theJournal Citation Reports
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Cooperation Behaviour of German Medical Faculties 1993-2001
No full textof the poster presented at the extra session (6 Collnet Meeting) of the 10 International Conference of the International Society for Scientometrics and Informetrics, Stockholm, Sweden, July 24-28, 2005. position amongst the foreign partner of German medical faculties. Whereas 22 different countries are the top 5 partner countries in 1993, this number has decreased to around 15 in the more recent years, indicating an equalization process which should be studied in detail. Next to the USA Great Britain, France, Switzerland, Austria, Sweden, Finland, Poland, Israel (to give some examples) and others are important partners. 4. The cooperation between the faculties exhibits a continual increase and comprises on average in 1993/1994 about 34%, in 2000/2001 ca. 45% of a faculty's papers. However, in most cases national cooperation partners obviously come from within the same faculty or from German institutions outside of the faculties (which could not be investigated) because the average paper published by a medical faculty carries two to three German addresses (see above). Each faculty has its own partner profile which is to some extent stable over the years. The first position, i.e. the highest rank of the partner faculties is restricted to 13 to 16 faculties in the different periods. It is interesting to see that the medical faculty of the LudwigMaximilians -University Munich serves eleven times as first-ranked partner for other faculties in 1993/1994 but looses this dominant position in the more recent past to the medical faculty of the Humboldt-University Berlin, the latter being eleven times the first-ranked partner in 2000/2001. Due to the fact that only the document identifiers could be downloaded (see Methods) the data give no hints to motivation or fields of coop..
Short text authorship attribution via sequence kernels, Markov chains and author unmasking: An investigation
No full textWe present an investigation of recently proposed character and word sequence kernels for the task of authorship attribution based on relatively short texts. Performance is compared with two corresponding probabilistic approaches based on Markov chains. Several configurations of the sequence kernels are studied on a relatively large dataset (50 authors), where each author covered several topics. Utilising Moffat smoothing, the two probabilistic approaches obtain similar performance, which in turn is comparable to that of character sequence kernels and is better than that of word sequence kernels. The results further suggest that when using a realistic setup that takes into account the case of texts which are not written by any hypothesised authors, the amount of training material has more influence on discrimination performance than the amount of test material. Moreover, we show that the recently proposed author unmasking approach is less useful when dealing with short texts
Short Text Authorship Attribution via Sequence Kernels, Markov Chains and Author Unmasking: An Investigation
No full textWe present an investigation of recently proposed character and word sequence kernels for the task of authorship attribution based on relatively short texts. Performance is compared with two corresponding probabilistic approaches based on Markov chains. Several configurations of the sequence kernels are studied on a relatively large dataset (50 authors), where each author covered several topics. Utilising Moffat smoothing, the two probabilistic approaches obtain similar performance, which in turn is comparable to that of character sequence kernels and is better than that of word sequence kernels. The results further suggest that when using a realistic setup that takes into account the case of texts which are not written by any hypothesised authors, the amount of training material has more influence on discrimination performance than the amount of test material. Moreover, we show that the recently proposed author unmasking approach is less useful when dealing with short texts.
Short text authorship attribution via sequence kernels, Markov chains and author unmasking: An investigation
No full textWe present an investigation of recently proposed character and word sequence kernels for the task of authorship attribution based on relatively short texts. Performance is compared with two corresponding probabilistic approaches based on Markov chains. Several configurations of the sequence kernels are studied on a relatively large dataset (50 authors), where each author covered several topics. Utilising Moffat smoothing, the two probabilistic approaches obtain similar performance, which in turn is comparable to that of character sequence kernels and is better than that of word sequence kernels. The results further suggest that when using a realistic setup that takes into account the case of texts which are not written by any hypothesised authors, the amount of training material has more influence on discrimination performance than the amount of test material. Moreover, we show that the recently proposed author unmasking approach is less useful when dealing with short texts
Epigrafía maya: Tabasco
No full textLa información de esta miniguía está basada en los trabajos de M. Coe, N. Grove, S. Guenter, S. Martín, P. Mathews, Linda Schele, D. Stuart y M. U. Zender.Cuatro de las grandes culturas desarrolladas en Mesoamérica poseían un sistema propio de escritura: zapoteca, maya, mixteca y náhuatl. La escritura maya fue el sistema más complejo y el que más correspondencia tuvo con la lengua hablada. Parece haber surgido alrededor del 100 o 200 d.C., y según la mitología fue el dios ltzamná quien la inventó. Sus últimas expresiones se sitúan alrededor de 1696. Los mayas utilizaron diferentes soportes para plasmar la escritura y su historia escrita, como códices de papel vasijas de barro, textiles, pieles, estelas y altares de piedra, dinteles y cajas de madera, pendientes de hueso y hasta finas puntas de cola de mantarraya, entre otros.</p
Furthering the Professional development of teachers - some observations, ideas and visions from the view point of a research mathematician at a German University
No full textThe talk starts with a short description of the system of teacher education in Germany as well as with an overview on the German school system. Presently the author is running a project entitled Mathematik Anders Machen which translates to Mathematics Done Differently to spread and to broaden existing local or regional professional development programs. This massive project is sponsored by the Deutsche Telekom Foundation (T-Mobile) in collaboration with the German Mathematicians\u27 Association (DMV). In describing the theoretical framework of the program the author will refer to recent international research results in the area of professional development
Myra Warhaftigs Berliner Zimmer
No full textIn the article, the floor plans of Myra Warhaftig's Dessauer Strasse 38-40 are examined as part of the floor plan development of the Berlin apartment building. The references to the "Berlin Room" (Berliner Zimmer), a special historical feature in the development of the Berlin apartment building, play an important role. For the author, the special achievement of this project lies in the synthesis of this type with modern sociological and emancipatory demands on the floor plan
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