TDG Scholar TDGScholar Committed to research! Version 1.7


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Version 1.7

Sat, 01 Dec 2012 22:00:00 +0100

Unfortunately, the design and management decisions we made in TDG 2.x were not successful. In version 2.x, we started to experiment with a new internal design, which we thought might help us improve scalability, reliability, and manageability of our service. Unfortunately, our decisions were not appropriate. After two and a half years running our 2.x service, the daily workload is too high for our design, so we have decided to revert it to the 1.x series. TDGS 1.7 provides the same functionality as TDGS 1.6; it’s been enhanced just not to break our clients, which should not experience any problems. Some of the advanced features of TDGS 2.x that have proven to be useful will be available gradually.

Version 2.1

Thu, 22 Jul 2010 22:00:00 +0100
New features
  • We have devised a tool that allows to integrate TDG Scholar into your own web site very easily. Should you be interested in using it, please drop a note at scholar at
  • We have added a button to get a permanent link to every page.
  • Reports are now clickable. You can launch a new query or refine the current one. If you have an embedded report or a MiniTDGS on your website, you can enjoy this new feature without making any changes.
  • We have made minor changes to the user interface to improve usability.
  • We have updated our JavaScript libraries to make them load and work faster.
  • Our translation to BibTeX now takes into account weird spellings, e.g., DBMS, SwetoDBLP, or McMAS. They are properly enclosed in curly brackets.
Bug fixes
  • People with more than one alias was sorted incorrectly.
  • Minor problems regarding reports have been fixed.
  • Some CSS issues were fixed.

Version 2.0

Fri, 26 Feb 2010 22:00:00 +0100
New features
  • TDG Scholar's user interface has been redesigned to make it easier to use. Publications, people, and hosts are now organised into independent, paginated tabs; the user can sort the results, and decide how many of them are to be shown in each page.
  • People are now identified univocally. When you search for "Hong Wang", our system retrieves publications by people whose name is "Hong Wang", but note that there are several people with this name; when you click on an author's name, that name is internally disambiguated so that the system returns only publications by the person who wrote the corresponding publication, no matter what his or her name is. If you wish to take a look at how many different people we know whose name is "Hong Wang", switch to the "People" tab.
  • We take aliases into account when searching for people. For instance, try searching for "Alon Y. Halevy" and you will get his publications as "Alon Y. Levy", as well; try searching for "Antonia Erni", and you will get her recent publications as "Antonia Albani", as well. Please, note that do not account for all aliases, since discovering them is a long-term process.
  • You can browse your search history using a built-in feature. This improves on your browser's history button since we take refinements into account.
  • We offer a binder you can use to store the publications in which you're interested.
  • You can subscribe to a query using an RSS feed.
  • Multi-tabbing browsing is supported from this release on.
  • Our restful search interface has been standardised as /Search/query. For instance, try or
  • The indexing mechanism is now more efficient. In the previous release, it took about 8 hours to index 2^20 records; it now takes roughly 3 hours... and keeps running on the same €500 commodity computer!
  • Refining queries is now more intuitive. In previous versions, refinements were amalgamated with user queries; from this version on, refinements are kept apart since this has proven more intuitive.
  • Both scripts and CSS files are minimized now. We hope this can improve the round trip a little.
  • URLs are now totally friendly.
  • Sharing reports on social networks is easier than ever.
  • The search engine was improved; it's about 3-5% faster in average, with peaks of 70-80% when answering multi-term queries.
  • We have added many tool tips to improve usability.
  • Our full-text search engine has improved significantly. In previous versions, searching for writers, journals, conferences or publishers did not return good results if their names included many initials, e.g., C.A.R. Hoare or A.K.M. Azad, hyphens, e.g., Da-Chun Wu or Byron Y.-L. Kuo, or common void words, e.g., an, the, other, while, numbers like (1) or (2), or Spanish von parts like "de" or "de las". Our new full-text search engine is now able to deal with most such cases very efficiently and returns very precise results.
Bug fixes
  • TDG Scholar has been fully tested with IE7.0+, FF2.0+, Chrome 1.0+ and Opera 9.5+ to ensure that the interface renders identically with these mainstream browsers.
  • In previous versions, keys "conference" and "journal" behaved the same, without making an actual distinction between conferences and journals. This bug has been fixed.
  • Now, home pages are not shown as publications.
  • Minor problems when encoding BibTeX reports have been fixed.

Version 1.6

Fri, 1 Jan 2010 22:00:00 +0100
New features
  • We have released a mini version of TDG Scholar that can be integrated into conference portals, association corporate sites, or personal home pages, to name a few examples. This version provides a search interface that is very similar to the full search interface, but allows your visitors to browse your publications in your own web site. This means that Mini TDG Scholar adapts to your corporate style, and provides your visitors with a homogenoeus search experience. (The mini version is currently localised to English and Spanish.) Using Mini TDG Scholar relieves you from the burden of keeping your publications page up-to-date, while we keep working to improve our search services so that you can benefit from them. Please, take a look at the following examples to see Mini TDG Scholar in action: Sistedes site, LSI Department, Manuel Resina's Publications, CEDI Multi-Conference portal, HAIS Conference portal. Should you be interested in integrating Mini TDG Scholar, please, do not hesitate to contact us at scholar at
  • You can now read our RSS news feed using browsers which, like Google Chrome, are not able to deal with such feeds unless they are endowed with an appropriate style sheet.
  • Minor improvements on usability and user interface.
  • There is a new section on sharing reports in the help page.
Bug fixes
  • Minor problems related to embedding XHTML into the RSS news feed have been corrected.
  • Minor grammar mistakes in static text have been corrected.
  • Since September 2009, we are serving roughly 2,500 queries per day, with peaks of 8,000+ queries. Note that this has had an impact on our response time; while common queries keep being served in less than a second, more complex or unusual queries require a little more to complete. Version 2.0, which is going to be released in the near future, runs on a similar €500 computer, but it is achieving an increase in efficiency of approximately 3-5%, with peaks of 70-80% when answering multi-term queries.

Version 1.5

Mon, 2 Nov 2009 22:00:00 +0100
New features
  • TDG Scholar can now be added to your browser as if it was an additional search provider. Visit our home page to enjoy this new feature. Please, note that it will not work unless your browser is OpenSearch-compliant, which includes IE and FF. If you use another browser, please, use the following links to learn about adding TDG Scholar as a search provider: Google Chrome, Opera.
  • There is an iGoogle Gadget available. To add it to your iGoogle home page, please, click here and follow Google's instructions. If you wish to add this gadget to your blog, simply copy and paste the following script:
    <script src=""></script>
  • TDG Scholar can now be browsed on Android and Opera-Mini devices!
  • The news page is now user friendly.
  • Your browser should be able to recognise our RSS news channels the sooner as you land on our pages.
  • Queries that came from Google looked ugly if they included accented characters. Such characters are now translated to improve readability.
  • Further improvements to the query execution planner allow to return a total of 125 results. This amounts to an improvement in efficiency of roughly 25%. The machine on which we run the service is the same: a €500 commodity computer.
Bug fixes
  • Sometimes, after displaying a report, the search box contained 'favicon.ico'.
  • Clicking on a URL delivered by Google worked well, but copying and pasting it resulted in an error.
  • The search box did not display perfectly in IE 7.0.
  • Minor problems with this feed have been fixed.
  • Minor problems regarding sharing a report have been fixed.

Version 1.4

Mon, 31 Aug 2009 15:00:00 +0100
New features
  • Special letters can now be entered using LaTeX escape sequences, too. For instance, you can type "\v{S}im\'{a}nek", instead of "Šimánek", "Kj{\AE}rulff" instead of "Kjærulff", "{\TH}{\'o}r" instead of "Þór", or "Kie{\ss}ling" instead of "Kießling". Note that special LaTeX characters must be enclosed within curly braces.
  • If you wish to query your publications, just browse, e.g., or Most browsers can handle spaces correctly, but if you wish to make sure that every body can access your publications page, please, replace them by plus signs. Please, bear in mind that this is an experimental feature, and that it will be improved in future releases.
  • TDG Scholar can now be browsed on your iPhone!
  • We now have a favicon.
  • In this version, our data model and algorithms are sufficiently stable and efficient to remove the 'Alpha' tag from version numbers.
  • The integration with Google and Yahoo has improved. If you land on TDG Scholar from one of these search engines, the page will scroll and highlight your search terms.
  • Site maps are now generated using the new direct query feature. This should help search engines index us a lot better.
Bug fixes
  • Common HTTP error pages are now localised to British English.
  • There was a problem with the sitemaps. Google indexed queries about authors whose name contains non-latin or accented characters with a trailing semi-colon, e.g., "Alfredo Goñ;i" instead of "Alfredo Goñi", or "Š;imá;nek" instead of "Šimánek".

Version A.1.3

Sat, 15 Aug 2009 22:00:00 +0100
New features
  • You can now change from a search service to another and your query will move around. This feature works across multiple browsing sessions, as well.
  • You can now use your browser's history button to retrieve previous queries.
  • Next to each publication, there is a link to fetch it from the web (if possible), to retrieve its BibTeX record, and to google it.
  • The number of records found is displayed.
  • The user interface has been redesigned to make it more usable.
  • Embedding a report is now easier than ever. You just need to copy a line of JavaScript and paste it into your home page.
  • The links to writers, hosts, publishers, and so on are plain now; this should help crawlers index TDG Scholar more easily.
  • Every page includes now an ad-hoc description and ad-hoc keywords; this should also help crawlers.
  • New improvements to the query execution planner allow to return a total of 100 results when searching for writers, journals, conferences and publishers. This amounts to a 200% improvement in efficiency.
Bug fixes
  • Safari and Chrome can now display our reports well.
  • Previous versions produced a lot of useless viewstate.
  • CSS Style sheets and XHTML are now (almost) totally W3C compliant. Only a minor error remains, but it is necessary for IE 5.5, IE 6.0, and IE 7.0 users.
  • No more rendering problems with IE 8.0.

Version A.1.2

Sat, 6 Jun 2009 22:00:00 +0100
New features
  • Special letters can now be entered explicitly or using HTML entities. For instance, you can type "Bj&ouml;rn &THORN;&oacute;r J&oacute;nsson" instead of "Björn Þór Jónsson" or "Bo K&aring;gstr&ouml;m" instead of "Bo Kågström". This will people who do not have an appropriate keyboard find your publications.
  • HTML and BibTeX reports are now linked to the sites from where the articles can be downloaded, if possible.
  • The query engine has been improved. Queries that returned thousands of records, e.g., "model" or "smith", led to timeouts. The engine can now handle these queries quite efficiently. A few other improvements to make other queries faster have been implemented.
  • The integration with web search engines has been improved by means of sitemaps.
Bug fixes
  • Some journals were not indexed properly.
  • Some XSS attacks made the server return HTTP 500.
  • Google Analytics did not track our site well.
  • There were minor CSS compliance problems.
  • Title anchors were too wide in IE, which made it difficult to select and copy them.

Version A.1.1

Fri, 26 Dec 2008 22:00:00 +0100
New features
  • Web search engines can now index TDG Scholar.
  • There is an RSS feed you can subscribe to.
  • Clicking on the title of a publication makes your browser for its electronic edition, if possible.
  • There is a new section to search for publishers.
  • The previous indexing mechanism took 195 hours (8 days) to index 2^20 records; the new version takes about 12 hours!
  • Our improvements to the query execution planner allow to return a total of 50 results when searching for writers, journals, conferences and publishers.
Bug fixes
  • Some search terms within quotes did not produce the expected results.
  • The Ajax loading icon would cause trouble if you clicked the search button repeatedly.

TDG Scholar is launched!

Sat, 30 Aug 2008 10:00:00 +0100

The TDG is proud to announce their new bibliography database for scholars.