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  • Springer  (43)
  • 2020-2024  (1)
  • 2000-2004  (42)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The VLDB journal 9 (2000), S. 247-260 
    ISSN: 0949-877X
    Keywords: Key words: Online reordering – Informix – Interactive data processing – User control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract. We present a pipelining, dynamically tunable reorder operator for providing user control during long running, data- intensive operations. Users can see partial results and accordingly direct the processing by specifying preferences for various data items; data of interest is prioritized for early processing. The reordering mechanism is efficient and non-blocking and can be used over arbitrary data streams from files and indexes, as well as continuous data feeds. We also investigate several policies for the reordering based on the performance goals of various typical applications. We present performance results for reordering in the context of an online aggregation implementation in Informix and in the context of sorting and scrolling in a large-scale spreadsheet. Our experiments demonstrate that for a variety of data distributions and applications, reordering is responsive to dynamic preference changes, imposes minimal overheads in overall completion time, and provides dramatic improvements in the quality of the feedback over time. Surprisingly, preliminary experiments indicate that online reordering can also be useful in traditional batch query processing, because it can serve as a form of pipelined, approximate sorting.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in engineering design 12 (2000), S. 220-234 
    ISSN: 1435-6066
    Keywords: Key words:Conceptual engineering – Conceptual robustness – Optimization – Polymer processing – Subjective reasoning – Uncertainties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract: Polymer processes are in general difficult to model, especially because of coupling between process conditions, polymeric behaviors and geometries. Arising from high thermal gradients, non-Newtonian viscous behaviors and non-linear pressure effects, polymer processing is not well described mathematically. A conceptual design methodology is proposed formally as a useful tool for treating polymeric processes with multiple performance parameters on a structured design platform. Without resorting to engineering models, this approach deals with the initial selection of process conditions within a three-stage framework: (1) qualitative design; (2) process modeling; and (3) quantitative design. Based on subjective reasoning, this procedure makes it possible to account for one’s prior experience, and incorporate it into the process development. The notion of conceptual robutstness is introduced to ensure deesign quality in the early-stage process development. A case study of compression molding is illustrated in a step-by-step manner.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of intelligent manufacturing 11 (2000), S. 435-451 
    ISSN: 1572-8145
    Keywords: Clustering ; grouping ; multiple criteria ; multi-objective optimization ; ranking ; supervised ANN ; unsupervised ANN
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract There are decision-making problems that involve grouping and selecting a set of alternatives. Traditional decision-making approaches treat different sets of alternatives with the same method of analysis and selection. In this paper, we propose clustering alternatives into different sets so that different methods of analysis, selection, and implementation for each set can be applied. We consider multiple criteria decision-making alternatives where the decision-maker is faced with several conflicting and non-commensurate objectives (or criteria). For example, consider buying a set of computers for a company that vary in terms of their functions, prices, and computing powers. In this paper, we develop theories and procedures for clustering and selecting discrete multiple criteria alternatives. The sets of alternatives clustered are mutually exclusive and are based on (1) similar features among alternatives, and (2) preferential structure of the decision-maker. The decision-making process can be broken down into three steps: (1) generating alternatives; (2) grouping or clustering alternatives based on similarity of their features; and (3) choosing one or more alternatives from each cluster of alternatives. We utilize unsupervised learning clustering artificial neural networks (ANN) with variable weights for clustering of alternatives, and we use feedforward ANN for the selection of the best alternatives for each cluster of alternatives. The decision-maker is interactively involved by comparing and contrasting alternatives within each group so that the best alternative can be selected from each group. For the learning mechanism of ANN, we proposed using a generalized Euclidean distance where by changing its coefficients new formation of clusters of alternatives can be achieved. The algorithm is interactive and the results are independent of the initial set-up information. Some examples and computational results are presented.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of intelligent manufacturing 11 (2000), S. 41-50 
    ISSN: 1572-8145
    Keywords: Forward and backward ANN mapping ; intelligent multi-objective optimization ; interactive ANN machine setup optimization ; MCDM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, we develop an artificial neural network method for machine setup problems. We show that our new approach solves a very challenging problem in the area of machining i.e. machine setup. A review of machine setup concepts and methods, along with feedforward artificial neural network is presented. We define the problem of machine setup to assessing the values of machine speed, feed and depth of cut (process inputs) for a particular objective such as minimize cost, maximize productivity or maximize surface finish. We use cutting temperature, cutting force, tool life, and surface roughness (process outputs) rather than objective functions to communicate with the decision maker. We show the relationship between process inputs to process outputs. This relationship is used in determining machine setup parameters (speed, feed, and depth of cut). Back propagation neural network is used as a decision support tool. The network maps, the forward relationship, and backward relationship between process inputs and process outputs. This mapping facilitates an interactive session with the decision maker. The process input is appropriately selected. Our method has the advantage of forecasting machine setup parameters with very little resource requirement in terms of time, machine tool, and people. Forecast time is almost instantaneous. Accuracy of the forecast depends on training and a well determined training sample provides very high accuracy. Trained network replaces the knowledge of an experienced worker, hence labor cost can be potentially reduced.
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  • 5
    ISSN: 1432-041X
    Keywords: Key words Sox9 ; CvSox9 ; Sex determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We have cloned and sequenced an orthologue of the human SOX9 gene in the lizard, Calotes versicolor, which lacks heteromorphic sex chromosomes as well as temperature-dependent sex determination. PCR amplification of Calotes cDNA using human SOX9 primers yielded an 861-bp fragment which harboured the high-mobility group domain and flanking sequences and had identity greater than 85% at nucleotide and greater than 90% at amino acid level with the hitherto known homologues of Sox9, demonstrating its evolutionary conservation. CvSox9 makes an approx. 5-kb transcript which is expressed in the genital ridge and mullerian duct of all the embryos from their very inception. In the genital ridge the expression in day 40 and day 45 embryos is confined to the embryonic testis (medulla) of only 50% embryos, indicating a shift in the expression from non-gonad-specific to testis-specific. The temporal and cell-specific expression in the genital ridge suggests a vital role for CvSox9 in the determination and/or differentiation of testis.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (2000), S. 1057-1059 
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
    ISSN: 1573-1472
    Keywords: Indian Ocean ; INDOEX ; ITCZ ; Marine boundary layer ; North-east monsoon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The variability in boundary-layerstructure over the Indian Ocean during a north-eastmonsoon and the factors influencing it areinvestigated. This study was made possible as acomponent of the Indian Ocean Experiment (INDOEX),conducted from February 19 to March 30, 1998. The dataused are, surface-layer mean and turbulencemeasurements of temperature, humidity and wind, andvertical soundings of temperature and humidity.Significant spatio-temporal variability was observedin the boundary-layer structure throughout the cruise.The ITCZ was characterized as the region withstrongest winds and maximum surface turbulent fluxesof momentum and heat. One of the important findingsfrom this study was a strong influence of continentalair masses on the boundary-layer structure in theNorthern Hemisphere, even at a distance of 600 km offthe Indian coast. This was generally evident in theform of an elevated plume of dry continental airbetween altitudes of 1500 m and 2700 m. Advection ofcontinental aerosols in this layer presents potentialfor significant entrainment into shallow clouds inthis region, which eventually feed deeper clouds atthe ITCZ. This finding provides an explanation foranomalous higher aerosol concentrations found duringprevious studies. The structure of the marineboundary layer was influenced by various factors suchas proximity to land, an anomalous warm pool in theocean and the ITCZ. In the southern hemisphere, theboundary-layer height was primarily governed bysurface-layer sensible heat flux and was found to behighest in the vicinity of the ITCZ. North of theequator it was strongly influenced by land-air-seainteractions. In addition to this synoptic modulation,there was also a significant diurnal variability inthe boundary-layer height.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Molecular and cellular biochemistry 215 (2000), S. 39-46 
    ISSN: 1573-4919
    Keywords: Salmonell typhimurium ; anaerobiosis ; virulence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Intestinal pathogens are exposed to various stress conditions during their infectious cycle. Anaerobiosis, one of such hostile condition, is offered by the host within gut and intestinal lumen, where survival, multiplication and entry into intestinal epithelial cells is priority for the invading pathogen. In the present study, a virulent strain of S. typhimurium (1402/84) was grown under anaerobic conditions and its virulence characteristics such as host cell binding, penetration and intracellular survival were compared with aerobic S. typhimurium. Anaerobically grown S. typhimurium showed significantly higher binding to immobilized mice enterocytes and intestinal mucus as compared to bacteria grown aerobically. Anaerobic bacteria also showed an early penetration of mucus and subsequent binding to underlying immobilized enterocytes, in vitro. Anaerobic S. typhimurium exhibited increased intracellular survival within spleen macrophages of mice and caused significantly higher fluid accumulation in ligated rabbit ileal loops as compared to aerobic bacteria. LD50 of anaerobic S. typhimurium was also observed to be 2 fold lower when compared to aerobic bacteria. Cell surface hydrophobicity of anaerobic S. typhimurium was also found to be significantly higher than aerobic bacteria. Thus, it appears that exposure of S. typhimurium to anaerobiosis results in its enhanced virulence, adhesion and penetration of host cells.
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  • 9
    ISSN: 1573-4978
    Keywords: development ; exon ; homeodomain ; intron ; labial
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Homeobox genes, first identified in Drosophila, encode transcription factors that regulate embryonic development along the anteroposterior axis of an organism. Vertebrate homeobox genes are described on the basis of their homology to the genes found within the Drosophila Antennapedia and Bithorax homeotic gene complexes. Mammals possess four paralogous homeobox (HOX) gene clusters, HOX A, HOX B, HOX C and HOX D, each located on different chromosomes, consisting of 9 to 11 genes arranged in tandem. We report the characterization of the human HOX D1 gene. This gene consists of two exons, encoding a 328 amino acid protein, separated by an intron of 354 bp. The human HOX D1 protein is one amino acid longer (328 amino acids) than the mouse protein (327 amino acids) and is 82% identical to the mouse HOX D1 homolog. The DNA binding homeodomain region of the human protein exhibits a 97% and 80% identity between mouse Hoxd1 and Drosophila labial homeodomains, respectively. The exon/intron and intron/exon splice junctions are conserved in position between human and mouse genes. Determination of the human HOX D1 gene structure permits the use of PCR based analysis of this gene for the assessment of mutations, for diseases that link to the HOXD cluster (such as Duanes Retraction Syndrome (DRS)), or polymorphisms associated with human variation. Molecular characterization of the HOXD1 gene may also permit analysis of the functional role of this gene in human neurogenisis.
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  • 10
    ISSN: 1573-5117
    Keywords: Stable isotope tracers ; carbon ; nitrogen ; mangroves ; litterfall ; suspended matter ; zooplankton ; macrobenthos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Stable carbon isotopic composition and C/N ratio were used to trace the input of carbon associated with mangrove litter into the estuary of the Godavari–Gautami delta system and Kakinada bay (Andhra Pradesh, India). Suspended organic matter in the mangrove channels was more depleted in 13C (average δ13C = −24.5‰) than in Kakinada bay which showed δ13C values for suspended matter (average δ13C = −22.7‰) closer to those expected for marine phytoplankton. Suspended organic matter from mangrove channels was enriched in nitrogen (average C/N atom ratio ≤ 12.7) and 13C (average δ13C = −24.5‰) relative to mangrove leaf litter, which had a C/N ratio of 75 and a δ13C value of −28‰. Lowest C/N ratios for suspended matter were observed during southwest monsoon when rainfall was highest. Although in general, mangrove litter fall was also lower during this period, no clear correlation was observed between litter fall and C/N ratio of suspended matter. In general, the composition of suspended matter pointed towards phytoplankton as a major component. Isotopic composition of zooplankton suggested selective feeding on 13C-enriched, marine phytoplankton in open Kakinada bay and on 13C-depleted organic matter, such as estuarine phytoplankton and mangrove litter, in the mangrove channels. From the δ13C signature, it appeared that mangrove carbon was present to some extent in zooplankton and macrofauna from the mangrove mudflats and channels, but the signal rapidly decreased in Kakinada bay. Nitrogen isotopic composition of zooplankton and macrofauna indicated a progressive enrichment of 15N away from the mangrove forest towards the northern part of Kakinada bay, in approach of Kakinada city. This is thought to reflect input of anthropogenic nitrogen enriched in 15N and subsequent uptake of this enriched nitrogen into the aquatic food chain.
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