@inproceedings{39510, abstract = {{Modeling of human knowledge and reasoning requires the formulation of uncertainty in its various forms. Fuzzy logic was introduced to directly support these applications (H. Zimmermann, 1991). Fuzzy control (FC) which is based on fuzzy logic allows one to control complex systems based on qualitative information like human knowledge (C. Geiger and G. Lehrenfeld, 1994). In fuzzy logic, fuzzy sets are usually defined and manipulated by means of complex mathematics, whereas the fuzzy control process is frequently outlined by visual sketches based on set diagrams in order to enhance the comprehension of the inference process. The rule based execution of this process usually follows the lines of rule based visual programming languages (VPLs), i.e., languages comparable to Agentsheets and ChemTrains. This strongly indicates that VPLs are thus well applicable for this use. We first outline the basic concepts of fuzzy logic and fuzzy control. Thereafter, we sketch a visual language which integrates fuzzy set diagrams in the visual representation of rules. The basic concepts are inherited from the complete visual programming language, Pictorial Janus (PJ). However, we significantly simplify PJ's visual concepts in order to adapt it for our purpose.}}, author = {{Dücker, M. and Geiger, Christian and Lehrenfeld, Georg and Müller, Wolfgang and Tahedl, C.}}, booktitle = {{Proceedings of the 1997 IEEE Symposium on Visual Languages}}, isbn = {{0-8186-8144-6}}, keywords = {{Computer languages, Fuzzy control, Fuzzy sets, Animation, Visualization, Fires, Application software, Pattern matching, Impedance matching, Domain specific languages}}, title = {{{A Visual Programming Language for Qualitative Data}}}, doi = {{10.1109/VL.1997.626593}}, year = {{1997}}, } @inproceedings{39505, abstract = {{3D-graphics are becoming popular in a steadily increasing number of areas such as entertainment, scientific visualization, simulation, and virtual reality. Despite this rapid growth the generation of animated 3D scenes is by no means trivial. Since animated 3D objects evolve over time the authors denote these objects as 4D. The article presents a novel approach to the rapid prototyping of 4D models. They introduce the AAL (Animated Agent Layer) system. AAL is an interpreter-based approach covering a textual (AAL-PR) as well as a visual command language (AAL-VL) for the specification of the dynamics in 4D scenes. AAL provides support for different levels of abstraction: primitives, structured objects, animated objects, and animated (autonomous) agents.}}, author = {{Dücker, M. and Geiger, Christian and Hunstock, R. and Lehrenfeld, Georg and Müller, Wolfgang}}, booktitle = {{Proceedings of the 1997 IEEE Symposium on Visual Languages}}, isbn = {{0-8186-8144-6}}, keywords = {{Prototypes, Layout, Animation, Command languages, Application software, Libraries, Virtual reality, Computer graphics, Hardware, Context modeling}}, title = {{{Visual-Textual Prototyping of 4D Scenes}}}, doi = {{10.1109/VL.1997.626601}}, year = {{1997}}, } @inproceedings{39502, abstract = {{The authors present a new approach to an interactive design and analysis environment for visual languages. The main components, i.e., editor animator and interpreter are introduced. Their interactions are being investigated emphasizing the interpreter-animator interaction and defining an interface supporting different levels of automation. The interpreter performs the executions on a logical level and triggers the animator. The interactive animation provides a very high degree of liveness since it is based on the tight integration of the animator and editor. The proposed architecture permits the distributed implementation of a system for real-time animation. Their concepts are validated by the implementation of a debugging environment for the complete visual programming language Pictorial Janus.}}, author = {{Dücker, M. and Lehrenfeld, Georg and Müller, Wolfgang and Tahedl, C.}}, booktitle = {{ Proceedings International Conference and Workshop on Engineering of Computer-Based Systems}}, isbn = {{0-8186-7889-5}}, keywords = {{Real time systems, Animation, Debugging, Automation, Computer languages, Timing, Environmental management, Programming environments, Visualization, Multimedia systems}}, location = {{Monterey, CA, USA }}, title = {{{A Generic System for Interactive Real--Time Animation}}}, doi = {{10.1109/ECBS.1997.581876}}, year = {{1997}}, } @inproceedings{39513, author = {{Aisch, H. and Joosten, M. and Müller, Wolfgang and Buijs, F.}}, title = {{{Interaktiver Produktdatenaustausch mit EDIFACT}}}, year = {{1996}}, } @inproceedings{39521, abstract = {{Investigates the integration of an interactive constraint solver into an existing 2D real-time animation environment in order to achieve a better observability, traceability and stability of the individual graphical objects. We present two approaches for assigning constraints to the objects. The first approach assigns constraints to the objects when they are created, keeping them stable during their entire life-time. The second approach dynamically changes constraints before the computation of each frame. The investigation is based on our practical experience with the complete visual programming language Pictorial Janus and the parallel constraint solver Parcon.}}, author = {{Griebel, P. and Lehrenfeld, Georg and Müller, Wolfgang and Tahedl, C. and Uhr, H.}}, booktitle = {{Proceedings of the 1996 IEEE Symposium on Visual Languages}}, isbn = {{0-8186-7508-X}}, keywords = {{Animation, Layout, Computer languages, Visualization, Observability, Stability, Runtime, Costs, Graphics, Hardware}}, title = {{{Integrating a Constraint Solver into a Real-Time Animation Environment}}}, doi = {{10.1109/VL.1996.545262}}, year = {{1996}}, } @inproceedings{39517, author = {{Dücker, Marita and Lehrenfeld, Georg and Müller, Wolfgang}}, booktitle = {{Proceedings of the 10th European Simulation Multiconference (ESM'96)}}, title = {{{Specification and Analysis of Concurrent Systems in a Complete Visual Environment}}}, year = {{1996}}, } @inproceedings{39526, abstract = {{The main goal of the article is to evaluate the suitability of visual programming languages, i.e., Pictorial Janus (K. Kahn and V. Saraswat, 1990), for the modeling of complex systems and their control strategies. These systems can be seen as networks of communicating objects. Objects select strategies for suitable actions based on incoming messages. Our field of investigation is in computer integrated manufacturing considering the example of a car manufacturing cell. This color sorting assembly buffer (CSAB) schedules jobs in queues. The jobs represent car bodies scheduled in feeder lines for the enameling. Feeder lines collect raw bodies to blocks. Blocks are bodies which are to be enameled by the same color. This organization decreases the cost of expensive change-over-times when changing colors at the enamelling. Blocks of bodies are dislocated from the queue and enameled successively. Contradictory system goals, such as minimizing color changes and preserving the sequence of incoming jobs, have to be regarded by appropriate control strategies. Due to the complexity of this (NP complete) problem and to real time requirements for online control there are no optimal strategies on hand. Consequently, suitable heuristics have to be developed. Often they are designed applying a trial-and-error method. A modeling framework has to support the rapid prototyping of these systems as well as an expressive end user oriented representation. Both are essential requirements since end users need other visualization techniques than experienced designers due to their different knowledge and interests.}}, author = {{Geiger, Christian and Hunstock, R. and Lehrenfeld, Georg and Müller, Wolfgang and Quintanilla, J. and Tahedl, C. and Weber, A.}}, booktitle = {{Proceedings of the 1996 IEEE Symposium on Visual Languages}}, isbn = {{0-8186-7508-X}}, keywords = {{Computer integrated manufacturing, Job shop scheduling, Processor scheduling, Computer languages, Control system synthesis, Computer aided manufacturing, Sorting, Assembly, Costs, Control systems}}, title = {{{Visual Modeling and 3D-Representation with a Complete Visual Programming Language --- A Case Study in Manufacturing}}}, doi = {{10.1109/VL.1996.545302}}, year = {{1996}}, } @inbook{34448, abstract = {{We present a rigorous but transparent semantic definition for VHDL corresponding to the IEEE VHDL’ 93 standard [68, 9, 84]. Our definition covers the full behavior of signal and variable assignments as well as the behavior of the various wait statements including delta, time, and postponed cycles. We consider explicitly declared signals, ports, local variables, and shared variables. Our specification defines an abstract VHDL ’ 93 interpreter in the form of transition rules for an evolving algebra machine (EA-Machine) [60]. It faithfully reflects and supports the view of simulation given in the IEEE VHDL ’ 93 standard language reference manual. The definition can be understood without any prior formal training. We illustrate our definition by running the example VHDL program set out in the Introduction to this volume.}}, author = {{Börger, Egon and Glässer, Uwe and Müller, Wolfgang}}, booktitle = {{Semantics of VHDL}}, editor = {{Delgado Kloos, C. and Breuer, Peter T.}}, isbn = {{978-1-4615-2237-9}}, keywords = {{Transition Rule Formal Verification Variable Assignment Kernel Process Simulation Cycle}}, pages = {{107 -- 139}}, publisher = {{Kluwer Academic Publishers}}, title = {{{A Formal Definition of an Abstract VHDL'93 Simulator by EA-Machines}}}, doi = {{10.1007/978-1-4615-2237-9_5}}, year = {{1995}}, } @inproceedings{39532, author = {{Lehrenfeld, Georg and Müller, Wolfgang and Wiechers, N.}}, booktitle = {{Proceedings of the 4th EXPRESS User's Group}}, title = {{{Conformance Tests of Very Large STEP Files}}}, year = {{1995}}, } @inproceedings{39535, author = {{Zhao, R. and Kaufmann, H. J. and Kern, T. and Müller, Wolfgang}}, location = {{Tokyo, Japan}}, title = {{{Pen-based Interfaces for Engineering Environments}}}, year = {{1995}}, } @inproceedings{39541, abstract = {{We investigate a translation of SDL diagrams into the complete visual representation of Pictorial Janus (PJ) programs in order to analyze the specification by visual debugging and animation. We additionally introduce timing concepts to PJ (Timed PJ) for a mapping of the SDL timing statements. The concepts transforming SDL interaction and process diagrams into Timed PJ are outlined by an example sketching the transformation of an Ethernet CSMA/CD protocol specification.}}, author = {{Lehrenfeld, Georg and Müller, Wolfgang and Tahedl, C.}}, booktitle = {{Proceedings of Symposium on Visual Languages}}, isbn = {{0-8186-7045-2}}, keywords = {{Animation, Timing, Debugging, Ethernet networks, Multiaccess communication, Protocols, Computer languages, Prototypes, Environmental management, Visualization}}, title = {{{Transforming SDL Diagrams Into a Complete Visual Representation}}}, doi = {{10.1109/VL.1995.520803}}, year = {{1995}}, } @inproceedings{39546, author = {{Müller, Wolfgang and Lehrenfeld, Georg and Wiechers, N.}}, title = {{{Validation of EXPRESS Models}}}, year = {{1995}}, } @inproceedings{39531, abstract = {{Greenville, South Carolina}}, author = {{Müller, Wolfgang and Felser, W. and Buijs, F.}}, booktitle = {{Proceedings of the 4th EXPRESS User's Group}}, title = {{{Guide to EXPRESS-P}}}, year = {{1995}}, } @inproceedings{39538, abstract = {{This article discusses the application of Pictorial Janus (PJ) for the rapid development and analysis of protocols by animation and complete visualization. In order to make PJ applicable in the context of hardware description we first extend PJ by timing facilities (Timed PJ) and introduce an approach for integrating VHDL models into this visual framework preserving the simulation semantics of VHDL. We finally give the example of the specification and animation of a non interlocked protocol.}}, author = {{Müller, Wolfgang and Lehrenfeld, Georg and Tahedl, C.}}, booktitle = {{Proceedings of ASP-DAC'95/CHDL'95/VLSI'95 with EDA Technofair}}, isbn = {{4-930813-67-0}}, keywords = {{Animation, Protocols, Timing, Computer languages, Electronic mail, Context modeling, Visualization, Control systems, Flow graphs, Trademarks}}, title = {{{Complete Visual Specification and Animations of Protocols}}}, doi = {{10.1109/ASPDAC.1995.486383}}, year = {{1995}}, } @inproceedings{39543, author = {{Zhao, R. and Müller, Wolfgang and Kaufmann, H. J. and Kern, Th. and Buijs, F.}}, booktitle = {{Proceedings of the 5th EXPRESS User's Group}}, title = {{{An Editor for the Rapid Prototyping of EXPRESS-G Models}}}, year = {{1995}}, } @inproceedings{39550, author = {{Müller, Wolfgang and Felser, W. and Wiechers, N.}}, title = {{{The Process Modeling Language EXPRESS-P}}}, year = {{1995}}, } @inproceedings{39557, author = {{Felser, W. and Müller, Wolfgang}}, title = {{{EXPRESS-P - Eine Erweiterung von ISO 10303-11 zur Prozessmodellierung}}}, year = {{1994}}, } @inproceedings{39560, abstract = {{In this paper we present a novel approach to the layout problem of dimensional graph based dia grams We introduce a framework for e ciently solving constrained layout problems encompassing geometrical and graph based algorithms especially dedicated to the generation of diagrams These concepts as well as the aesthetics for the read ability of diagrams are presented by introducing FADE FADE is a user parametrizable frame work for the generation of EXPRESS G diagrams Our present implementation is discussed consider ing extensions to other classes of graphs and layout problems Additionally competitive approaches in this domain and their limitations are critically reviewed.}}, author = {{Eikerling, Josef and Müller, Wolfgang}}, booktitle = {{Proceedings of the 17th Annual Computer Science Conference}}, pages = {{331--342}}, title = {{{FADE: A Layout Facility for Graph-Based Diagrams}}}, year = {{1994}}, } @inproceedings{39565, author = {{Hyhuis, D. and Müller, Wolfgang}}, booktitle = {{Proceedings of the 2nd International Conference on Concurrent Engineering & Electronic Design Automation (CEEDA94)}}, title = {{{Implementing Simultaneous Design: A Case Study}}}, year = {{1994}}, } @inproceedings{39577, author = {{Müller, Wolfgang and Lehrenfeld, Georg and Wiechers, N.}}, title = {{{Implementierung eines parallelen Validierungswerkzeugs für STEP-Produktdaten unter PVM}}}, year = {{1994}}, }