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  • Springer  (36)
  • American Association for the Advancement of Science  (6)
  • 2015-2019  (9)
  • 2010-2014  (5)
  • 1995-1999  (13)
  • 1990-1994  (15)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Transmission policies and traffic management in multimedia wireless networks (1997)
    Springer
    Wireless networks 3 (1997), S. 103-112 
    Details
    ISSN: 1572-8196
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Computer Science
    Notes: Abstract We consider multimedia wireless networks in environments where traffic characterizations and traffic rates are generally time‐varying. For such networks we propose a CDMA transmission policy, in conjunction with a moving boundaries concept induced by a traffic monitoring high‐level protocol. The proposed transmission/traffic management technique is analyzed and numerically evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019184629070
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamic capacity allocation and hybrid multiplexing techniques for ATM wireless LANs (1998)
    Springer
    Mobile networks and applications 3 (1998), S. 307-316 
    Details
    ISSN: 1572-8153
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We consider digital wireless multimedia LANs and time‐varying traffic rates. To deal effectively with the dynamics of the time‐varying traffic rates, a Traffic Monitoring Algorithm (TMA) is deployed to dynamically allocate channel capacities to the heterogeneous traffics. The TMA is implemented as a higher level protocol that dictates the capacity boundaries within two distinct framed transmission techniques: a Framed Time Domain‐Based (FTDB) technique and a Framed CDMA (FCDMA) technique. The performance of the TMA in the presence of the FTDB technique is compared to its performance in the presence of the FCDMA technique for some traffic scenarios. The performance metrics used for the TMA‐FTDB and TMA‐FCDMA combinations are channel capacity utilization factors, traffic rejection rates, and traffic delays. It is found that the TMA‐FTDB is superior to the TMA‐FCDMA when the speed of the transmission links is relatively low and the lengths of the transmitted messages are relatively short. As the speed of the transmission links and the length of the transmitted messages increase, the TMA‐FCDMA eventually outperforms the TMA‐FTDB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019141202797
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  • 3
    Electronic Resource
    Electronic Resource
    Traffic monitoring for capacity allocation of multimedia traffic in ATM broadband networks (1998)
    Springer
    Telecommunication systems 9 (1998), S. 173-206 
    Details
    ISSN: 1572-9451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract We address the accommodation of multimedia traffic by ATM broadband networks. We isolate a single network channel and we search for capacity allocation/transmission multiplexing policies which satisfy all traffic QOSs with simultaneous high utilization of channel capacity resources, in the presence of variable traffic rates. Towards that direction, we superimpose a high-level traffic-monitoring protocol which determines capacity allocations for each traffic category, dynamically. The latter protocol has sequential and implementation-efficient characteristics, and induces moving boundaries within prespecified and fixed channel frames. The channel frames are selected to satisfy the jittering constraints of all the traffics, such as voice, video and high versus low speed data. The high level protocol, in conjunction with the channel frame structure and the specifics of the transmission policy, may satisfy all traffic QOSs and may simultaneously attain high channel utilization, for certain variability conditions of the traffic rates and at relatively low implementation cost. Performance analysis as well as numerical evaluations are provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019143822748
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of gamma radiation on the development of the Caribbean fruit fly (Anastrepha suspensa) and the subsequent development of its parasite Diachasmimorpha longicaudata (1990)
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 295-297 
    Details
    ISSN: 1570-7458
    Keywords: Biocontrol ; sterilization ; mass release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190669
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  • 5
    Electronic Resource
    Electronic Resource
    Age- but not caste-related regulation of abdominal mechanisms underlying the sting reflex of the honey bee, Apis mellifera (1994)
    Springer
    Journal of comparative physiology 174 (1994), S. 581-592 
    Details
    ISSN: 1432-1351
    Keywords: Honey bee ; Sting response ; Motor control ; Ventral nerve cord ; Maturation ; Caste
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Stinging behavior has been extensively studied in honey bees at the level of the individual, that is, in terms of stimuli that release stinging in adult bees, and in terms of integration of individual behavior into colony defense. Yet very little is known about the physiological basis for this behavior. Using an isolated abdominal preparation factors that influence peripheral control of the sting extension response are analyzed. Results show that: 1. Electromyogram activity released by severing the ventral nerve cord changed during the first few days of adult life but not later. Abdomens from older bees (nurses, guards, foragers) showed significantly higher EMG activity than newly emerged or 24 h-old bees. 2. The reflex “matured” over 5–7 days after emergence as an adult. 3. Younger bees (≤24h) had a lower threshold for initiating sting extension than older bees. However, the threshold for initiating the full sting response, i.e., extension and venom pumping, did not differ due to age. 4. Caste status was not correlated to any of the parameters of sting extension, indicating that any effect of caste on stinging behavior must arise in more anterior ganglia and/or in the brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217379
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  • 6
    Electronic Resource
    Electronic Resource
    The impact of neural networks in finance (1997)
    Springer
    Neural computing & applications 6 (1997), S. 193-200 
    Details
    ISSN: 1433-3058
    Keywords: Economic modelling ; Finance ; Neural networks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The financial industry is becoming more and more dependent on advanced computer technologies in order to maintain competitiveness in a global economy. Neural networks represent an exciting technology with a wide scope for potential applications, ranging from routine credit assessment operations to driving of large scale portfolio management strategies. Some of these applications have already resulted in dramatic increases in productivity. This paper brings together, from diverse sources, a collection of current research issues on neural networks in the financial domain. It examines a range of neural network systems related to financial applications from different levels of maturity to fielded products. It discusses the success rate of the neural network systems, and their performance in resolving particular financial problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01501506
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of low temperature on the activity of phosphofructokinase from potato tubers (1990)
    Springer
    Planta 180 (1990), S. 613-616 
    Details
    ISSN: 1432-2048
    Keywords: Phosphofructokinase ; Solanum (phosphofructokinase) ; Sugar accumulation ; Temperature and phosphofructokinase activity ; Tuber (cold-induced sweeting)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this work was to compare the coldlability of phosphofructokinase (EC 2.7.1.11) from tubers of potato cultivars (cvs.) known to differ in their propensity to accumulate sugars at low temperature. When stored at 4°C for six weeks, the sugar content of tubers ofSolanum tuberosum L. cv. Record doubled whereas the amount of sugar in tubers of cv. Brodick and an advanced breeding clone (13676) decreased slightly. Tubers from each line contained four forms of phophofructokinase. Over the range 12°–16°C the temperature coefficients of the four forms of phosphofructokinase from cvs. Record and Brodick were similar. In cv. Record the temperature coefficients of three of the enzyme forms were significantly higher at 2°–6°C than at 12°–16°C, whereas those from cv. Brodick were unchanged. These results are consistent with the proposal that inactivation of phosphofructokinase at low temperature results in the accumulation of hexose phosphates leading to increased sucrose synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411461
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  • 8
    Electronic Resource
    Electronic Resource
    From concept to practice: Implementing cumulative impact assessment in New Zealand (1995)
    Springer
    Environmental management 19 (1995), S. 445-456 
    Details
    ISSN: 1432-1009
    Keywords: Cumulative impact assessment ; Methods ; Institutional context ; Resource management ; New Zealand
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In 1991, provisions for environmental impact assessment in New Zealand were changed significantly with the enactment of the Resource Management Act. Among other provisions, this act requires consideration of cumulative impacts in environmental assessment activities undertaken by planners in newly created regional authorities and district and city councils. The institutional context in which the act is being implemented offers both opportunities and constraints to cumulative impact assessment. A lack of methods for CIA is a recognized problem. However, methods that have been developed for environmental impact assessments can be modified to incorporate second-, third-, and fourth-order impacts as well as to identify the direction and magnitude of additive and synergistic impacts. Layered matrices and combined networks are examples of such methods. While they do not allow for scientific prediction, they do provide the practitioner with the ability to consider the cumulative impacts of decisions. This is crucial in New Zealand, where statutory requirements are ahead of established methodologies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471985
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  • 9
    Electronic Resource
    Electronic Resource
    The expression of class I patatin gene fusions in transgenic potato varies with both gene and cultivar (1991)
    Springer
    Plant molecular biology 16 (1991), S. 153-160 
    Details
    ISSN: 1573-5028
    Keywords: β-glucuronidase (GUS) (β-D-glucuronoside glucuronosohydrolase ; E.C.3.2.1.31) ; patatin ; potato cultivar promoter ; transgenic expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Patatin is a family of glycoproteins that contributes about 40% of the total soluble protein in tubers of potato (Solanum tuberosum L.). The protein is encoded by a multigene family of 50–70 genes which have been divided into classes I and II on the basis of sequence homology. The promoters of two class I genes, PS20 and PS3/27, were transcriptionally fused to β-glucuronidase and transformed into the potato cultivars Désirée and Maris Bard. Examination of the expression levels in large populations of microtubers indicated that the PS20 promoter produced β-glucuronidase activities 5-fold lower in Désirée than Maris Bard whereas the PS3/27 promoter showed similar levels in both cultivars. Furthermore, the relative expression levels from the two promoters were reversed in the two cultivars. The β-glucuronidase enzyme activity was correlated with the mRNA level but not the copy number of the introduced gene. The implications for the use of patatin promoters in the genetic modification of tubers is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017925
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  • 10
    Electronic Resource
    Electronic Resource
    Adenosine diphosphate glucose pyrophosphorylase genes in wheat: differential expression and gene mapping (1995)
    Springer
    Planta 197 (1995), S. 1-10 
    Details
    ISSN: 1432-2048
    Keywords: ADP-glucose pyrophosphorylase ; Gene ex ; pression (Agp1, Agp2) ; Hexaploid wheat-Starch synthesis ; Triticum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A full-length cDNA clone representing the large (shrunken-2) subunit of ADP-glucose pyrophosphorylase (AGP; EC 2.7.7.27) has been isolated from a cDNA library prepared from developing grain of hexaploid wheat (Triticum aestivum L., cv. Chinese Spring). The 2084-bp cDNA insert contains an open reading frame of 1566 nucleotides and primer-extension analysis indicated that the 5′ end is 10 nucleotides shorter than the mRNA. The deduced protein contains 522 amino acids (57.8 kDa) and includes a putative transit peptide of 62 amino acids (6.5 kDa). The similarity of the deduced protein to the small subunit of AGP and to other AGP genes from plants and microorganisms is discussed. Northern hybridisation shows that the Agp1 genes (encoding the small subunit in the wheat endosperm) and the Agp2 genes (encoding the large subunit in the wheat endosperm) are differentially expressed in the wheat grain. Transcripts from both gene sets accumulate to high levels in the endosperm during grain development with the majority of the expression in the endopsperm rather than the embryo and pericarp layers. Although enzyme activity is detected in developing grains prior to 10 d post anthesis, only the Agp1 genes are active at this time (the Agp2 genes are not expressed until 10 d post anthesis). The possibility that the enzyme expressed during early grain development is a homotetramer of small subunits is discussed. The Agp1 and Agp2 genes are arranged as triplicate sets of single-copy homoeoloci in wheat. The Agp2 genes are located on the long arms of chromosomes 1A, 1B and 1D, about 80 cM from the centromere. The Agp1 genes have been mapped to a position just distal to the centromere on the long arms of chromosomes 7A, 7B and 7D.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239933
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