Gerd Richter

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Early identification of pancreaticoduodenal endocrine tumors (PETs) in multiple endocrine neoplasia type 1 (MEN-1) is mandatory, because these tumors represent the most common cause of death within the syndrome. The diagnostic value of imaging procedures has therefore been evaluated in a prospective observational study. Between December 1997 and June 2003(More)
This paper investigates error and erasure decoding methods for codes with maximum rank distance. These codes can be used for correcting column and row errors and erasures in an ( ) array. Such errors occur e.g. in magnetic tape recording or in memory chip arrays. For maximum rank distance codes (Rank-Codes), there exists a decoding algorithm similar to the(More)
In this paper, we present a construction method based on the progressive edge-growth (PEG) algorithm to design irregular low-density parity-check (LDPC) codes without small stopping sets. We show how to choose the connections in the PEG algorithm when having multiple choices to connect a variable node with a check node. Since preventing small stopping sets(More)
Orthodontic miniscrews are exposed to three mechanical loading phases during clinical use: torsional loading upon insertion, flexural loading during anchorage function, and torsional loading upon removal. The aim of this study was to simulate clinical loading conditions for different types of orthodontic miniscrews in vitro to quantify the effects of(More)
UNLABELLED Definition of problem: BACKGROUND Reproductive Biomedicine and new reproductive technologies (ART) belong to the fields of medicine that initiated most of the discussion on enhancement and desire fulfilling medicine in bioethics during the last years. One of the crucial questions to be answered is the definition of the right to procreate/right(More)
Definition of the problem: In Germany, clinical ethics is still in the state of development. Ethics consultation is very new and rare in the clinical setting in German university hospitals. Therefore this paper describes the clinical ethics activities at the Medical Center of Philipps University, Marburg, regard to ethics consultation in a case report.(More)
The regulation of reproductive medicine technologies differs significantly among Western industrialized countries. In Germany, preimplantation genetic diagnosis (PGD) is prohibited due to the Embryo Protection Act, which came into force in 1991. In the last 5 years, this prohibition has been vigorously debated. In the present studies, which are part of the(More)