Quasiconvex Constrained Multicriteria Continuous Location Problems: Structure of Nondominated Solution Sets

In this paper, we consider constrained multicriteria continuous location problems in two-dimensional spaces. In the literature, the continuous multicriteria location problem in two-dimensional spaces has received special attention in the last years, although only particular instances of convex functions have been considered. Our approach only requires the functions to be strictly quasiconvex and inf-compact. We obtain a geometrical description that provides a unified approach to handle multicriteria location models in two-dimensional spaces which has been implemented in MATHEMATIC

An Improved Implementation and Inalysis of the Diaz and O'Rourke Algorithm for Finding the Simpson Point of a Convex Polygon

This paper focuses on the well-known Diaz and O'Rourke [M. Diaz and J. O'Rourke, Algorithms for computing the center of area of a convex polygon, Visual Comput. 10 (1994), 432–442.] iterative search algorithm to find the Simpson Point of a market, described by a convex polygon. In their paper, they observed that their algorithm did not appear to converge pointwise, and therefore, modified it to do so. We first present an enhancement of their algorithm that improves its time complexity from O(log2?) to O(n log 1/?). This is then followed by a proof of pointwise convergence and derivation of explicit bounds on convergence rates of our algorithm. It is also shown that with an appropriate interpretation, our convergence results extend to all similar iterative search algorithms to find the Simpson Point – a class that includes the original unmodified Diaz–O'Rourke algorithm. Finally, we explore how our algorithm and its convergence guarantees might be modified to find the Simpson Point when the demand distribution is non-uniform

7th International Meshing Roundtable '98

The goal of the 7th International Meshing Roundtable is to bring together researchers and developers from industry, academia, and government labs in a stimulating, open environment for the exchange of technical information related to the meshing process. In the past, the Roundtable has enjoyed significant participation from each of these groups from a wide variety of countries

Abstracts on Radio Direction Finding (1899 - 1995)

The files on this record represent the various databases that originally composed the CD-ROM issue of "Abstracts on Radio Direction Finding" database, which is now part of the Dudley Knox Library's Abstracts and Selected Full Text Documents on Radio Direction Finding (1899 - 1995) Collection. (See Calhoun record https://calhoun.nps.edu/handle/10945/57364 for further information on this collection and the bibliography). Due to issues of technological obsolescence preventing current and future audiences from accessing the bibliography, DKL exported and converted into the three files on this record the various databases contained in the CD-ROM. The contents of these files are: 1) RDFA_CompleteBibliography_xls.zip [RDFA_CompleteBibliography.xls: Metadata for the complete bibliography, in Excel 97-2003 Workbook format; RDFA_Glossary.xls: Glossary of terms, in Excel 97-2003 Workbookformat; RDFA_Biographies.xls: Biographies of leading figures, in Excel 97-2003 Workbook format]; 2) RDFA_CompleteBibliography_csv.zip [RDFA_CompleteBibliography.TXT: Metadata for the complete bibliography, in CSV format; RDFA_Glossary.TXT: Glossary of terms, in CSV format; RDFA_Biographies.TXT: Biographies of leading figures, in CSV format]; 3) RDFA_CompleteBibliography.pdf: A human readable display of the bibliographic data, as a means of double-checking any possible deviations due to conversion

Remote Sensing of Earth Resources: A literature survey with indexes (1970 - 1973 supplement). Section 1: Abstracts

Abstracts of reports, articles, and other documents introduced into the NASA scientific and technical information system between March 1970 and December 1973 are presented in the following areas: agriculture and forestry, environmental changes and cultural resources, geodesy and cartography, geology and mineral resources, oceanography and marine resources, hydrology and water management, data processing and distribution systems, instrumentation and sensors, and economic analysis

The Gatlin Site (41KR621): Investigating Archaic Lifeways on the Southern Edwards Plateau of Central Texas

From May 2004 through the summer of 2008 and on behalf of the Environmental Affairs Division (ENV) of the Texas Department of Transportation (TxDOT), SWCA Environmental Consultants (SWCA) undertook extensive archaeological investigations and analyses on the Gatlin site, 41KR621, located on the Guadalupe River, Kerr County, Texas. Work at the site was necessitated by the planned 1.15-mile extension of Spur 98 from its current limits to cross the Guadalupe River and terminate at FM 1338. As the project included both state and federal funding, TxDOT was required to comply with Section 106 of the National Historic Preservation Act, the implementing regulations of 36CFR Part 800, and the Texas Antiquities Code. In the case of 41KR621, since the archaeological site was determined eligible for listing under Criterion D and since impacts could not be avoided, a plan to mitigate the project effects was developed. The subsequent work in the form of data recovery is the primary basis of this report. SWCA initially conducted the survey and site testing investigations along the Spur 98 corridor in May 2004. TxDOT then contracted SWCA to conduct the data recovery excavations under THC Antiquities Permit 3532. Data recovery excavations at 41KR621 spanned September through November 2004 and included the re-excavation of several backhoe trenches from the testing phase, excavation of new control trenches, removal of overburden in two areas of the site, and hand excavating roughly 145 m3 of the site in broad horizontal exposures. Combined, the testing and data recovery work resulting in the recovery of 37 burned rock features (including a buried burned rock midden), close to 50,000 pieces of debitage, 409 projectile points, 1,085 bifaces, 343 cores, over 400 flaked and non-chipped tools, and a modest amount of ecofacts. The investigations documented four cultural occupations. The earliest of the Gatlin site’s components, Occupation Zone (OZ) 1, contained Gower points and dates from approximately 6,800 B.P. to possibly as late as 6,000 B.P., falling within the Early Archaic. OZ2, a younger and more extensive Early Archaic occupation with mainly Gower and Martindale points, covers the period of ca. 6,100–4,500 B.P. The third zone, OZ3, a more compressed transitional phase between the Early to Middle Archaic dominated by Early Triangular diagnostic artifacts, is a component that produced dates of ca. 4,500–3,850 B.P. The youngest occupation, OZ4, which contained a burned rock midden but proved to be an admixture of broad temporal and cultural components, spans the Middle through Late Archaic periods, as evidenced by numerous diagnostic point types. Utilizing one of the largest excavated samples of Early and Middle Archaic cultural deposits in the southern Edwards Plateau, the results of the study provide a unique look at human adaptation and basic lifeways at the site and surrounding region. Evidence indicates the Gatlin site was primarily utilized by small groups of foraging hunter-gatherers for short periods of time to acquire and process game, replenish their stocks of raw materials, and gear-up for future forays. The abundant game, plant foods, fuel, chert resources, and overall comfort of the riparian setting likely served as major draws for continuous occupation over thousands of years. Utilizing the projectile point sequence and suite of radiocarbon dates from 41KR621, the Early–Middle Archaic chronology of south Central Texas is revised and refined. Comparisons to other excavated sites in the region reveal new and important patterns regarding human adaptation during the Early and Middle Archaic on the southern Edwards Plateau. All artifacts and project related materials will be curated at the Texas Archeological Research Laboratory

Energy: A continuing bibliography with indexes (Issue 29)

This bibliography lists 1360 reports, articles, and other documents introduced into the NASA scientific and technical information system from January 1, 1981 through March 31, 1981