15 Fakultätsübergreifend / Sonstige Einrichtung
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Item Open Access Quantification of aortic stenosis based on the morphology of Doppler ultrasound signals using image processing techniques(1994) Zahn, Thomas P.; Nagel, Joachim H.; Agatston, Arthur S.A method was developed to evaluate the morphologic structure of continuous wave Doppler ultrasound signals in order to quantify aortic valve stenosis in the human heart. The systolic peaks of the Doppler signal were assigned digital images and the stability of shape information was tested for patients with low stroke volume and aortal fibrillation. The results indicate that the shape of the signal peaks remains stable despite variations in amplitude and duration. The shape information was then used to quantify the severity of aortic stenosis by optimally matching Doppler peak images to selected templates representing typical diagnostic patterns. The developed software is capable of automatic extraction of shape information from Doppler ultrasound signals in order to support the clinical decision about valve functioning and replacement.Item Open Access Risk communication on the community level : european experiences from the Seveso directive(1988) Renn, OrtwinThe following paragraphs will describe the major provisions of the Soveso Directive, report on the implementation of and experiences with the Seveso Directive in the EC member states, analyze the relationships between regulatory style and risk communication, and summarize the findings in forms of recommendations for future activities of risk communications in the US.Item Open Access Metallic coordination polymers using CS2 as starting material(1987) Keller, Heimo J.; Klutz, Thomas; Münstedt, Helmut; Renner, Gerd; Schweitzer, DieterOrganic polymers with "metallic" properties have found widespread interest during the last few years. Acetylene and aniline as well as different nitrogen and sulfur heterocycles have been used as starting materials. One main problem hampering the technical application of these solids up to now is their environmental and thermal instability. Therefore, we introduced metal ions to stabilize polymeric backbones with high electrical conductivity. Because of the enormous coordination ability of sulfur to many transition metal ions we decided to use a polymeric carbon-sulfur backbone.Item Open Access Extending the relational algebra to capture complex objects(1989) Mitschang, BernhardAn important direction in database research for non-standard applications (e.g. engineering or design applications) deals with adequate support for complex objects. Without doubt, the provision of network structures and shared subobjects as well as support for dynamic object definition and appropriate manipulation facilities is urgently needed for natural and accurate modeling as well as for efficient processing of the applications' objects. These concepts are the major concern of the molecule-atom data model (MAD model) and its molecule algebra which is introduced in this paper. They make the model stand out compared to the relational model and even to models limited to hierarchical and statically defined complex objects. By means of the molecule algebra a precise and complete specification of one conceivable kind of complex object processing and its inherent semantics is provided. Furthermore, this algebra is used as a sound basis to express the semantics of the high level query language MOL (molecule query language) that is able to deal with complex objects in a descriptive manner.Item Open Access Die Ermittlung von Steuerprofilen zur Insulinabgabe mit programmierbaren Insulininfusionssystemen(1981) Schulz, Gerhard; Beyer, Jürgen; Nagel, Joachim H.; Strack, Thomas; Krause, Ulrich; Hassinger, Wieland; Cordes, UweDer Insulinverbrauch und die Form der Insulinabgabeprofile bei intravenöser Insulintherapie mit nicht rückgekoppelten Infusionsgeräten wurde bisher nur rein empirisch ermittelt. Dabei war die Form der Insulinabgabeprofile nicht zuletzt auch von den technischen Möglichkeiten des Dosiergerätes abhängig. Unser Ziel war es, Grundsätze für die Blutzuckerführung mit Open-Loop-Systemen zu entwickeln. Die Insulinprofile sollten dem Blutzuckeranstieg und Abfall nach den Mahlzeiten möglichst gut angepaßt sein und individuell programmiert werden können, so daß der Patient zu den Mahlzeiten das entsprechende Programm abrufen kann.Item Open Access Practical methods and tools for specification(1987) Ludewig, JochenThis is a course on specification. Since it is based on experiences in the field of software engineering. It applies primarily to software specifications. Many observations and reports indicate, however, that, from specification aspects, there is not much difference between information processing systems in general and software in particular. Therefore, most of this course applies also to system specification. In the first chapter, some fundamentals are discussed. These include the life cycle model and the distribution of costs over the various activities, some definitions, and a rationale for semi-formal specification. The second chapter provides a general outline of a specification system, whose desirable properties are deduced from the qualities of good specifications. In the third chapter, we present some typical specification systems. The primary goal is to show some typical features of such systems rather than to describe them in detail. The fourth chapter addresses management aspects. In chapter 5, some general conclusions are drawn. The appendix (chapter 6) contains a bibliography on specification, and a list of suppliers.Item Open Access Issues in designing object management systems(1990) Clow, Geoff; Plödereder, ErhardThis paper summarizes the discussions of the Object Management System (OMS) session at the Chinon Workshop. The session identified numerous capabilities which might be required in an OMS. The facilities which were agreed upon as essential to an OMS are presented in Section 1, OMS Core Facilities. A number of issues in the realization of these and other capabilities, influenced in part by specific application scenarios, are discussed in Section 2, OMS Requirements Issues. Promising applications requiring further investigation can be found in Section 3, Perceptions for the Future. Some global observations on the past and future conduct of the OMS field are summarized in Section 4, Concluding Observations.Item Open Access Indirect optically controlled pseudomorphic HEMT based MMIC oscillator(1992) Bangert, Axel; Benz, Willi; Berroth, Manfred; Hülsmann, Axel; Hurm, Volker; Kaufel, Gudrun; Köhler, Klaus; Rosenzweig, Josef; Schneider, JoachimFor the first time an indirect optically controlled monolithic integrated oscillator was fabricated and examined experimentally. The oscillator was designed for a frequency of about 7 GHz. By illuminating a 60x60 μm2 photodiode by the light of a pigtailed laser diode (λ=840 nm), the free-running frequency of the oscillator was tunable in a range of more than 7 MHz. A locking range of more than 3 MHz was achieved. A phase shift in the output signal of nearly 180° has been observed.Item Open Access The synthesis of self-test control logic(1989) Haberl, Oliver F.; Wunderlich, Hans-JoachimIn recent years, many built-in self-test techniques have been proposed based on feedback shift-registers for pattern generation and signature analysis. But in general, these test-registers cannot test several modules of the chip concurrently, and they have to be controlled by external automatic test equipment. The authors propose a method to integrate additional test-control logic into the chip. On the basis of a register-transfer description of the circuit, the test control is derived, and a corresponding finite automation is synthesized. A hardware implementation is proposed, resulting in circuits where the entire self-test only consists in activating the test mode and clocking and evaluating the overall signature.Item Open Access Ökonomische Auswirkungen des Einsatzes neuer Informationstechnologien in der Güterdistribution(1988) Arnold, UlliWir haben eine Tendenz zur zahlenmäßigen Verringerung der Zulieferer festgestellt. Es gibt schon Beispiele dafür, daß nur noch ein einzelner Zulieferer "just-in-time" eingeschaltet wird. Für den Wettbewerb zwischen diesen Wirtschaftsstufen bedeutet das, daß marktwirtschaftliche Abstimmungsprozesse durch wechselseitige Planabstimmungen ersetzt werden. Damit werden zugleich auch Markteintrittsbarrieren aufgebaut. Andererseits wird der Marktaustritt wegen der wechselseitigen Verflechtungen zumindest nicht mehr kurzfristig möglich sein. Die Wettbewerbsbeziehungen werden statisch und von reinen Macht- bzw. Verteilungskonflikten zwischen den Parteien beherrscht. Das Kräftegleichgewicht in einem Distributionssystem wird sich nur durch jene Unternehmen verändern lassen, die zu beachtlichen transaktionsspezifischen Investitionen in der Lage sind, etwa zum Aufbau und Betrieb einer zentralen Datenbank.