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For the efficient management of large image databases, the automated characterization of images and the usage of that characterization for searching and ordering tasks is highly desirable. The purpose of the project SEMACODE is to combine the still unsolved problem of content-oriented characterization of images with scale-invariant object recognition and modelbased compression methods. To achieve this goal, existing techniques as well as new concepts related to pattern matching, image encoding, and image compression are examined. The resulting methods are integrated in a common framework with the aid of a content-oriented conception. For the application, an image database at the library of the university of Frankfurt/Main (StUB; about 60000 images), the required operations are developed. The search and query interfaces are defined in close cooperation with the StUB project “Digitized Colonial Picture Library”. This report describes the fundamentals and first results of the image encoding and object recognition algorithms developed within the scope of the project.
The prevention of credit card fraud is an important application for prediction techniques. One major obstacle for using neural network training techniques is the high necessary diagnostic quality: Since only one financial transaction of a thousand is invalid no prediction success less than 99.9% is acceptable. Due to these credit card transaction proportions complete new concepts had to be developed and tested on real credit card data. This paper shows how advanced data mining techniques and neural network algorithm can be combined successfully to obtain a high fraud coverage combined with a low false alarm rate.
A tale of two lost archives
(2009)
This paper surveys the growth and various phases of and influences on the concept of democracy in the Islamic political thought of the last two centuries. Among the thinkers covered in the survey are Rifa'a Tahtawi (1801-73), Khairuddin at-Tunis (1810-99), Jamal ad-Din al-Afghani (1838-97), Muhammad Abduh (1849-1905), Abdurrahman al-Kawakibi (1849-1903), Rashid Rida (1865-1935), Hasan al-Banna (1904-49), Ali Abd Ar-Raziq (1888-1966), Sayyid Qutb (1906-66), Sa'id Hawwa, and Malik Bennabi (1905-73). Reference is made to the influence of Sayyid Mawdudi (1903-79), on the thought of Sayyid Qutb. The paper traces also the bearing of Bennabi's thought on Rachid Ghannouchi and on the Islamic movements of our times.