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open access

Genetic algorithms for DNA sequence assembly

Description: This paper describes a genetic algorithm application to the DNA fragment assembly problems. The genetic algorithm uses a random key representation for representing the orderings of fragments. Two different fitness functions, both based on pairwise overlap strengths between fragments, were tested. The paper concludes that the genetic algorithm is a promising method for fragment assembly problems, achieving usable solutions quickly, but that the current fitness functions are flawed and that other… more
Date: April 13, 1993
Creator: Parsons, R.; Burks, C. (Los Alamos National Lab., NM (United States)) & Forrest, S. (New Mexico Univ., Albuquerque, NM (United States). Dept. of Computer Science)
Partner: UNT Libraries Government Documents Department
open access

Exploring phase space concepts in the forecasting of time series with artificial neural networks

Description: The authors study the performance of feedforward artificial neural networks in forecasting future values of several different time series. They explore both short- and long-term prediction of several periodic time series. They find that a significant source of error in long-term prediction of time series is introduced by a phase shift between the network output and the time series. They explore the origin of this phase shift and suggest strategies for minimizing its effect. They find that the p… more
Date: September 13, 1993
Creator: Rogers, R. D. & Vemuri, V.
Partner: UNT Libraries Government Documents Department
open access

Burst mode FEL with the ETA-III induction linac

Description: Pulses of 140 GHz microwaves have been produced at a 2 kHz rate using the ETA-III induction linac and IMP wiggler. The accelerator was run in bursts of up to 50 pulses at 6 MeV and greater than 2 kA peak current. A feedback timing control system was used to synchronize acceleration voltage pulses with the electron beam, resulting in sufficient reduction of the corkscrew and energy sweep for efficient FEL operation. Peak microwave power for short bursts was in the range 0.5--1.1 GW, which is com… more
Date: May 13, 1993
Creator: Lasnier, C. J.; Allen, S. L. & Felker, B.
Partner: UNT Libraries Government Documents Department
open access

Refining a triangulation of a planar straight-line graph to eliminate large angles

Description: Triangulations without large angles have a number of applications in numerical analysis and computer graphics. In particular, the convergence of a finite element calculation depends on the largest angle of the triangulation. Also, the running time of a finite element calculation is dependent on the triangulation size, so having a triangulation with few Steiner points is also important. Bern, Dobkin and Eppstein pose as an open problem the existence of an algorithm to triangulate a planar straig… more
Date: May 13, 1993
Creator: Mitchell, S. A.
Partner: UNT Libraries Government Documents Department
open access

Stabilization of the external kink and other MHD issues. Summary report

Description: An MHD workshop entitled ``Stabilization of the External Kink and Other MHD Issues`` was held June 1993. This is a summary report of activities at that workshop, structured to respond to the three questions in the charge (letter from J. Willis). The experimental and theoretical status of these issues, and the R&D needs in each area, are addressed. We discuss the potential impact on the TPX and ITER programs of these issues. The workshop participants came from a broad and diverse range of instit… more
Date: August 13, 1993
Creator: Freidberg, J. P.; Goldston, R. J.; Jardin, S. C.; Neilson, G. H.; Rosenbluth, M. N.; Taylor, T. S. et al.
Partner: UNT Libraries Government Documents Department
open access

Genetic algorithms for DNA sequence assembly

Description: This paper describes a genetic algorithm application to the DNA fragment assembly problems. The genetic algorithm uses a random key representation for representing the orderings of fragments. Two different fitness functions, both based on pairwise overlap strengths between fragments, were tested. The paper concludes that the genetic algorithm is a promising method for fragment assembly problems, achieving usable solutions quickly, but that the current fitness functions are flawed and that other… more
Date: April 13, 1993
Creator: Parsons, R.; Burks, C. & Forrest, S.
Partner: UNT Libraries Government Documents Department
open access

Poroelasticity of rock

Description: Poroelasticity is the theoretical framework used to describe the coupled processes which occur when a fluid bearing porous material is deformed by a stress field. The theoretical basis for the treatment of problems in poroelasticity has been derived in an extensive body of work over the last fifty years, most notably by Biot. Many of Biot`s successors have attempted to find relationships between the physical properties of the material to be analyzed and the Biot coefficients. Our approach to th… more
Date: May 13, 1993
Creator: Bonner, B. P.; Berge, P. A.; Berryman, J. G. & Wang, H. F.
Partner: UNT Libraries Government Documents Department
open access

Industrial alliances

Description: The United States is emerging from the Cold War era into an exciting, but challenging future. Improving the economic competitiveness of our Nation is essential both for improving the quality of life in the United States and maintaining a strong national security. The research and technical skills used to maintain a leading edge in defense and energy now should be used to help meet the challenge of maintaining, regaining, and establishing US leadership in industrial technologies. Companies recog… more
Date: September 13, 1993
Creator: Adams, K. V.
Partner: UNT Libraries Government Documents Department
open access

Experience with performance based training of nuclear criticality safety engineers

Description: For non-reactor nuclear facilities, the U.S. Department of Energy (DOE) does not require that nuclear criticality safety engineers demonstrate qualification for their job. It is likely, however, that more formalism will be required in the future. Current DOE requirements for those positions which do have to demonstrate qualification indicate that qualification should be achieved by using a systematic approach such as performance based training (PBT). Assuming that PBT would be an acceptable mec… more
Date: July 13, 1993
Creator: Taylor, R. G.
Partner: UNT Libraries Government Documents Department
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