Digital Commons Network^™

Some Distribution-Free Properties Of Throughput And Response Time, Peter J. Denning, Kevin C. Kahn

Department of Computer Science Technical Reports

No abstract provided.

On The Computational Complexity Of Approximation Operators Ii, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

Back Cover, Purdue Road School

Purdue Road School

No abstract provided.

Recycling In Today's Cities, Christie Menze

Purdue Road School

No abstract provided.

Upgrading Existing Highways For Safety, Bob L. Smith

Purdue Road School

No abstract provided.

Wrong-Way Movements On Divided Highways, Peter N. Scifres, Roy C. Loutzenheiser

Purdue Road School

No abstract provided.

Capacity Bounds For Multi-Resource Queues, K. J. Omahen

Department of Computer Science Technical Reports

No abstract provided.

Equational Logic And Equational Theories Of Algebras, Don Pigozzi

Department of Computer Science Technical Reports

No abstract provided.

On The Limits Of Text File Compression, V. Y. Shen, M. H. Halstead

Department of Computer Science Technical Reports

No abstract provided.

Optimization Among Provably Equivalent Programs, Paul Young

Department of Computer Science Technical Reports

No abstract provided.

The Algorithm Selection Problem, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

A Study Of Program Locality And Lifetime Functions, Peter J. Denning, Kevin C. Kahn

Department of Computer Science Technical Reports

No abstract provided.

Corrections To Some Errors In A Version Of Tsp: (Time Series Processor), Robert E. Lynch

Department of Computer Science Technical Reports

No abstract provided.

Estimating Response Time For Auxiliary Memory Configurations With Multiple Movable-Head Disk Modules, K. Omahen

Department of Computer Science Technical Reports

No abstract provided.

Acreage Estimation, Feature Selection, And Signature Extension Dependent Upon The Maximum Likelihood Decision Rule, John A. Quirein, M. C. Trichel

LARS Symposia

The maximum likelihood decision rule and estimation of the resulting m-class probability of misclassification are discussed. A bound on the variance of a proposed unbiased estimator of the m-class probability of error is derived. The problem of estimating the a priori probabilities for two classes is covered. When the estimator is counting the proportion of classified samples assigned to each class, a bound on the error of the estimate is derived. The problem of m-class feature selection using the Bhattacharyya distance is also addressed. The particular case in which each class density is assumed to be a mixture of multivariate …

Geometric Analysis And Restitution Of Digital Multispectral Scanner Data Arrays, James R. Baker, Edward M. Mikhail

LARS Technical Reports

This thesis contains the results of an investigation performed in order to define causes of geometric defects within digital multispectral scanner (MSS) data arrays, to analyze the nature of the resulting geometric errors, and to investigate restitution methods to correct or reduce such geometric errors.

The thesis includes a review of digital multispectral scanning systems, including the recording and digital form for computer aided analysis. Causes of geometric errors within the data arrays are presented, and previous investigations of geometric aspects of remote sensing systems are reviewed.

The introduction of geometric transformation relationships for scanned data, from which collinearity equations …

Spectral Characteristics Of Soils Related To The Interaction Of Soil Moisture, Organic Carbon, And Clay Content, Robert H. Beck

LARS Technical Reports

By measuring certain physical properties of fifteen soils typical of Wisconsin-aged, glacial till soils capped with less than 60 inches of loess in Indiana, the variations in spectral response in the laboratory were explained. Spectral reflectance measure with the Exotech 20-C can be significantly explained by percent moisture, organic carbon, and clay content of these soils. The soils studied were predominantly silty with a range of organic carbon from .60 to 1.33%. The moisture content of the soils was controlled by use of the pressure membrane at 15 bars, pressure plates at 1/3 bar, and oven dried at 105°C for …

Summary Of: Photographic Display Of Landsat-1 Cct Images For Improved Geological Definition, T. G. Longshaw, R. P. Viljoen, M. C. Hodson

LARS Symposia

LANDSAT-1 Bulk MSS Computer Compatible Tapes (CCT's) maintain the intrinsic radiometric and spatial qualities of the MSS (NASA, 19721 and as such are potentially superior to MSS 70 mm photographic products in the study of both regional and small scale geological trends. A convenient method of realising this potential is via a digital-to-analogue conversion of processed CCT data and CRT display to produce photographic hardcopy. This paper describes a flexible method of producing such displays that can be colour composited with ground-based mapping data transformed to be compatible with the MSS geometric projection. Mapping accuracy of image detail to corresponding …

Development Of A Field Portable Bi-Channel Real Time Hybrid Image Processing System, Nelson Corby, Lester A. Gerhardt, Edward Sims

LARS Symposia

A bichannel, portable, low cost, hybrid processor capable of interactive real-time image processing for use in the field or laboratory is described. Major features of the Programmable Video Processor (PVP) such as operation as a remote pre-processor controlled by a host image processing computer facility or manual operation as a stand-alone processor, digitally programmed operating mode control and internal image statistic generation are discussed. Finally, selected applications in which the PVP has proven useful are outlined.

Skolem Rings And Their Varieties, J. R. Buchi, T. M. Owens

Department of Computer Science Technical Reports

No abstract provided.

Modeling And Performance Evaluation Of Physical Data Base Structures, S. B. Yao

Department of Computer Science Technical Reports

No abstract provided.

The Essential Design Criterion For Computer Languages: Software Science, M. H. Halstead

Department of Computer Science Technical Reports

No abstract provided.

Collocation Methods For Linear Elliptic Problems, Elias N. Houstis

Department of Computer Science Technical Reports

No abstract provided.

Magnetoelastic Rayleigh Wave Convolver, William P. Robbins, Mark S. Lundstrom

Department of Electrical and Computer Engineering Faculty Publications

An epoxy-bonded LiNb03-YIG-LiNb03 composite structure has been constructed and operated as a magnetoelastic Rayleigh wave convolver with 50-MHz input signals. The acoustic signals were propagated on a (110) YIG surface and the convolution characteristics were studied as a function of the magnitude and direction of the applied magnetic field. Nonuniform demagnetizing fields limited convolution pulses to less than 1.5 /-Lsec duration. Relatively efficient operation was observed corresponding to an internal efficiency F int of -53 dBm

Data Resolution Versus Forestry Classification And Modeling, E. P. Kan, D. L. Ball, J. P. Basu, R. L. Smelser

LARS Symposia

This paper examines the effects on timber stand computer classification accuracies caused by changes in the resolution of remotely sensed multispectral data. This investigation is valuable, especially for determining optimal sensor and platform designs.

Theoretical justification and experimental verification support the finding that classification accuracies for low resolution data could be better than the accuracies for data with higher resolution. The increase in accuracy is construed as due to the reduction of scene inhomogeneity at lower resolution. The computer classification scheme was a maximum likelihood classifier.

Erts Direct Digital Printing & Multitemporal Data Registration, Robert F. Burke, William Marshall

LARS Symposia

The objective of this study was to determine if the quality of the ERTS imagery could be improved by averaging successive passes over the same physical area.

The U.S.G.S. designated five passes over two areas of study: Washington, D. C. and Phoenix, Ariz., with the requirement that optimized imagery be derived directly from the EROS Data Center Bulk CCT's. The Mead system goes directly from the Bulk CCT's to hard-copy print-out, thereby by-passing any intermediate electronic, electro-optical, or photographic processes which may lead to image deterioration.

Resolution Enhancement Of Erts Imagery, C. D. Mcgillem, T. E. Riemer, G. Mobasseri

LARS Technical Reports

A method is described for combined interpolation and enhancement of ERTS multispectral scanner data sets. Previous research has shown that good enhancement is not easily achieved when there are a large number of data points contained within the radius of gyration of the system point spread function. This requirement can be met using ERTS data by interpolating the data before enhancement. By varying the interpolation scale factor the data set can be empirically matched to a precalculated optimum restoration filter. Once the proper match of data and filter has been found the enhancement can be carried out directly or the …

Evaluation Of All-Digital Precision Registration Methods For Landsat Mss Data, S. Rifman, B. Peavey, R. Caron, K. Simon

LARS Symposia

A major factor contributing to the utility of LANDSAT data is the repetitive coverage of each spot on the earth's surface within the sensor's field of view at least once every 18 days. This repeat coverage makes possible: studies of crop growth: monitoring urban development and land use: and predicting water runoff from melting ice and snow, just to name a few examples. Of central importance to investigators performing these studies is the requirement that imagery and/or image data on computer compatible tapes (CCT's) register to a fraction of a pixel. This paper describes the application of all digital processing …

Fisheries Utilization Of Remotely Sensed Data, Thomas M. Vamelous, Thomas D. Leming, Andrew J. Kemmerer, Kenneth J. Savastano

LARS Symposia

The Fisheries Engineering Laboratory has conducted experiments in conjunction with ERTS-1 and Skylab-3 overflights, and is initiating an experiment using LANDSAT data acquisition systems. Data analyses have demonstrated relationships between remotely sensed oceanographic conditions and the distribution and abundance of specific living marine resources. These correlations have been used as the basis for predictive models which, when validated and refined, may benefit the fishing industry and the biological community.

Resolution Enhancement Of Erts Imagery, C. D. Mcgillem, T. E. Riemer, G. Mobasseri

LARS Symposia

A method is described for combined interpolation and enhancement of ERTS multispectral scanner data sets. Previous research has shown that good enhancement is most easily achieved when there are a large number of data points contained within the radius of gyration of the system point spread function. This requirement can be met using ERTS data by interpolating the data before enhancement. By varying the interpolation scale factor the data set can be empirically matched to a precalculated optimum restoration filter. Once the proper match of data and filter has been found the enhancement can be carried out directly or the …