Science Publications

Nearly 600 bottom-hole temperature data from the northern continental shelf of the Gulf of Mexico, each corrected for drilling disturbance, yielded a regional map of geothermal gradient down to approximately 6 km (3.7 mi) sub-sea floor. Two geographic trends can be seen on the map. First, from east to west, the geothermal gradient changes from values between 0.025 and 0.03 K/m (0.014 and 0.016 degreeF/ft) off the Alabama-Mississippi shore to lower values of 0.015-0.025 K/m (0.008-0.014 degreeF/ft) off eastern Louisiana and to higher values of 0.03-0.06 K/m (0.016-0.033degreeF/ft) off western Louisiana through Texas. Second, thermal gradients tend to be lower toward the outer continental shelf (less than 0.02 K/m [0.0112 degree F/ft]). We believe that the observed variations are primarily attributable to the thermal effect of rapid and regionally variable sediment accumulation during the Cenozoic era, which resulted in the occurrence of the geopressured zone in the Texas -Louisiana shelf. (more…)

We survey some results in quantum cryptography. After a brief introduction toclassical cryptography, we provide the quantum-mechanical background needed to present somefundamental protocols from quantum cryptography. (more…)

In this article, we review the algorithms for rotation, scaling andtranslation (RST) invariant image watermarking. There are mainly two categories of RST invariantimage watermarking algorithms. One is to rectify the RST transformed image before conductingwatermark detection. Another is to embed and detect watermark in an RST invariant or semi-invariantdomain. (more…)

In 1990, Manber and Myers proposed suffix arrays as a space-savingalternative to suffix trees and described the first algorithms for suffix array construction anduse. Since that time, and especially in the last few years, suffix array construction algorithmshave proliferated in bewildering abundance. (more…)

This article presents a survey of denial of service attacks and the methodsthat have been proposed for defense against these attacks. In this survey, we analyze the designdecisions in the Internet that have created the potential for denial of service attacks. (more…)

Full-text indexes provide fast substring search over large text collections.A serious problem of these indexes has traditionally been their space consumption. A recent trend isto develop indexes that exploit the compressibility of the text, so that their size is a functionof the compressed text length. This concept has evolved into self-indexes, which in addition containenough information to reproduce any text portion, so they replace the text. The excitingpossibility of an index that takes space close to that of the compressed text, replaces it, and inaddition provides fast search over it, (more…)

The article reviews the most popular peer-to-peer key management protocolsfor mobile ad hoc networks (MANETs). The protocols are subdivided into groups based on their designstrategy or main characteristic. (more…)

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BackgroundThe compliance review (CR) is a federal program monitoring motor carrier safety performance and regulatory compliance. This study sought to assess the impact of CRs on reviewed trucking companies in reducing truck crashes.MethodsData was from the Motor Carrier Management Information System. Study subjects were trucking companies established during 1990–1995, had at least one truck, and remained active until April 2004. (more…)