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Full-Text Articles in Engineering
An Evaluation Of The Effectiveness Of Adaptive Histogram Equalization For Contrast Enhancement, John B. Zimmerman, Stephen M. Pizer, Edward V. Staab, J. Randolph Perry, William Mccartney, Bradley C. Brenton
An Evaluation Of The Effectiveness Of Adaptive Histogram Equalization For Contrast Enhancement, John B. Zimmerman, Stephen M. Pizer, Edward V. Staab, J. Randolph Perry, William Mccartney, Bradley C. Brenton
All Computer Science and Engineering Research
Adaptive Histogram Equalization (AHE), a method of contrast enhancement which is sensitive to local spatial information in an image, has been proposed as a solution to the problem of the inability of ordinary display devices to depict the full dynamic intensity range in some medical images. This method is automatic, reproducible, and simultaneously displays most of the information contained in the grey-scale contrast of the image. However, it has not been known whether the use of AHE causes the loss of diagnostic information relative to the commonly-used method intensity windowing. In the current work, AHE and intensity windowing are compared …
Load And Communications Balancing On Multiprocessor Logic Simulation Engines, Ken Wong, Mark A. Franklin
Load And Communications Balancing On Multiprocessor Logic Simulation Engines, Ken Wong, Mark A. Franklin
All Computer Science and Engineering Research
The problem considered in this paper is to find an assignment of logic components to processors which will achieve logic simulation speed-ups approaching the ideal for large processor populations. This problem becomes particularly important when a significant portion of the speed-up expected from logic simulation engines is attributed to load sharing (as opposed to obtaining speed-up by employing specialized hardware to carry out specific tasks associated with the simulation process such as event queue manipulation or function evaluation). Our research considers this problem for a particular multiprocessor simulation architecture for which a performance model has bene developed. The model is …
Transaction Network: A Parallel Computation Model Based On Consume/Produce Paradigm, Takayuki Dan Kimura
Transaction Network: A Parallel Computation Model Based On Consume/Produce Paradigm, Takayuki Dan Kimura
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This report introduces a new parallel computation model that is suitable for pursuit of large scale concurrency. Our goal is to develop a semantically clean paradigm for distributed computation with fine-grained parallelism. Our approach is to demote the notion of process as the key concept in organizing large scale parallel computation. We promote, instead, the notion of transaction, an anonymous atomic action void of internal state, as the basic element of computation. We propose to organize a computation as a network, called a transaction net, of databases connected by transactions. A transaction, when it is fired, consumes data objects from …
Advanced Communications Systems, Jonathan S. Turner
Advanced Communications Systems, Jonathan S. Turner
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The Advanced Communication Systems Project is concerned with new communication technologies that can support a wide range of different communication applications in the context of large public networks. Communications networks in common use today have been tailored to specific applications and while they perform their assigned functions well, they are difficult to adapt to new uses. There currently are no general purpose networks, rather there are telephone networks, low-speed data networks and cable television networks. As new communications applications proliferate, it becomes clear that in the long term, a more flexible communications infrastructure will be needed. The Integrated Services Digital …
Prodb: An Experimental Generalized Database System User's Manual, Guillermo R. Simari
Prodb: An Experimental Generalized Database System User's Manual, Guillermo R. Simari
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The following notes document in a succinct manner the use of the system PRODB. The system is still evolving and several new features are in the process of being added. PRODB is a prototype system that is being used as an exploration vehicle of the possible extensions to the relational model through logic programming. The system consists of a relational database system having a relational algebra type language as a query language. It is written in Prolog and it extends the capabilities of Prolog predicates with the relational algebra operators for handling the database structure. The database system currently provides …
Belief Maintenance Systems: Initial Prototype Specification, Roseanne M. Fulcomer, William E. Ball, John P. Tadlock
Belief Maintenance Systems: Initial Prototype Specification, Roseanne M. Fulcomer, William E. Ball, John P. Tadlock
All Computer Science and Engineering Research
A fundamental need in future information systems is an effective method of accurately representing and monitoring dynamic, real-world situations inside a computer. Information is represented using an Extended Open World Assumption (EOWA), in which the data are explicitly true or false. Reasoning within the EOWA is done through the use of a dynamic dependency net which only represents those beliefs and justifications that are both currently valid and in current use. In this paper, we present definitions and uses of the EOWA and dynamic dependency net in our current research of developing a database with which we can use deductive …