Posts Tagged ‘Ahmet Yildirim’

Mathematical turbulence at Ege University, Turkey

August 28, 2013

Back in June I had reported on the strange case at Ege University

Retraction Watch reports on the retraction of a paper by a Turkish mathematician for plagiarism. The author did not agree with the retraction.

But what struck me was the track record of this amazing Assistant Professor at Ege University.

Ahmet Yildirim Assistant Professor, Ege University, Turkey

Editorial Board Member of International Journal of Theoretical and Mathematical Physics

  • 2009       Ph.D      Applied Mathematics, Ege University (Turkey)
  • 2005       M.Sc      Applied Mathematics, Ege University (Turkey)
  • 2002       B.Sc        Mathematics, Ege University (Turkey)

Since 2007 he has a list of 279 publications!

That’s an impressive rate of about 50 publications per year. Prolific would be an understatement.

But the link to his 279 publications is now broken which now only goes to a blank page.

Upon a little further investigation it became clear that not only does he no longer work at Ege University but that his PhD has also apparently been revoked.

Paul Wouters writes:

In mathematics and computer science, Ege university has produced 210 publications (Stanford wrote almost ten times as much). Because this is a relatively small number of publications, the reliability of the ranking position is fairly low, which is indicated by a broad stability interval (an indication of the uncertainty in the measurement). Of the 210 Ege University publications, no less than 65 have been created by one person, a certain Ahmet Yildirim. This is an extremely high productivity in only 4 years in this specialty. Moreover, the Yildirim publications are indeed responsible for the high ranking of Ege University: without them, Ege University would rank around position 300 in this field. This position is therefore probably a much better reflection of its performance in this field. Yildirim’s publications have attracted 421 citations, excluding the self-citations. Mathematics is not a very citation dense field, so this level of citations is able to strongly influence both the PP(top10%) and the MNCS indicators.

An investigation into Yildirim’s publications has not yet started, as far as we know. But suspicions of fraud and plagiarism are rising, both in Turkey and abroad. One of his publications, in the journal Mathematical Physics, has recently been retracted by the journal because of evident plagiarism (pieces of an article by a Chinese author were copied and presented as original). Interestingly, the author has not agreed with this retraction. A fair number of Yildirim’s publications have been published in journals with a less than excellent track record in quality control.  ….. 

How did Yildirim’s publications attract so many citations? His 65 publications are cited by 285 publications, giving in total 421 citations. This group of publications has a strong internal citation traffic. They have attracted almost 1200 citations, of which a bit more than half is generated within this group. In other words: this set of publications seems to represent a closely knit group of authors, but they are not completely isolated from other authors. If we look at the universities citing Ege University, none of them have a high rank in the Leiden Ranking with the exception of Penn State University (which ranks at 112) that has cited Yildirim once. If we zoom in on mathematics and computer science, virtually all of the citing universities do not rank highly either, with the exception of Penn State (1 publication) and Gazi University (also 1 publication). The rank position of the last university, by the way, is not so reliable either, as indicated by the stability interval that is almost as wide as in the case of Ege University.

And a commenter at Poul Waters site adds:

kuantumcartcurt Says:
July 4, 2013 at 12:30 PM

Thanks for this detailed post. It seems that Ahmet Yıldırım’s PhD was recently revoked since it was a direct translation of a book of Ji-Huan He who is also quite a questionable figure in academia (http://elnaschiewatch.blogspot.com.es/2011/02/ji-huan-he-loses-ijnsns.html). It also seems that he was dismissed from the university (again without any official statement).

Here is Ahmet Yıldırım’s PhD ‘thesis’:https://docs.google.com/file/d/0BxUoSj9K4YfeNDIwUUZGRWU1R2c/edit?pli=1
And this is Ji-Huan He’s book: https://docs.google.com/file/d/0BxUoSj9K4YfeZmZvdGpDQUVWY0E/edit?pli=1

It would seem that Ege University is carrying out some house cleaning but neither the University nor the International Journal of Theoretical and Mathematical Physics is saying anything.

Mathematical genius?

June 4, 2013

Retraction Watch reports on the retraction of a paper by a Turkish mathematician for plagiarism. The author did not agree with the retraction.

But what struck me was the track record of this amazing Assistant Professor at Ege University.

Ahmet Yildirim Assistant Professor, Ege University, Turkey

Editorial Board Member of International Journal of Theoretical and Mathematical Physics

  • 2009       Ph.D      Applied Mathematics, Ege University (Turkey)
  • 2005       M.Sc      Applied Mathematics, Ege University (Turkey)
  • 2002       B.Sc        Mathematics, Ege University (Turkey)

Since 2007 he has a list of 279 publications!

That’s an impressive rate of about 50 publications per year. Prolific would be an understatement.

All peer reviewed no doubt.


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