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  • Articles  (190)
  • 2015-2019  (178)
  • 1995-1999  (10)
  • 1970-1974  (2)
  • Computer Science  (190)
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  • Articles  (190)
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  • 1
    Electronic Resource
    Electronic Resource
    Traffic impacts of international roaming on mobile and personal communications with distributed data management (1997)
    Springer
    Mobile networks and applications 2 (1997), S. 345-356 
    Details
    ISSN: 1572-8153
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In this paper, we propose four network interconnection scenarios and the related signaling aspects for the international roaming traffic in mobile and personal communications. With or without international gateway relay nodes summarized from the proposed scenarios, we also derive three international roaming network sets {IR1, IR2, IR3} for the observed signaling traffic model with two‐level databases. Based on the proposed performance metrics, analysis results show that under some reasonable assumptions the signaling traffic of international roaming is significantly impacted by the related gateway relay nodes and databases. In addition, the studied cache data management strategy at VLR can reduce the impacts of the signaling traffic of query operation, but the caching approach cannot improve the performance of update operation. Furthermore, the performance of proposed standalone STP scenario is better than that of integrated STP scenario for the international network connection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1013609506489
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nonpreemptive scheduling of periodic tasks in uni- and multiprocessor systems (1996)
    Springer
    Algorithmica 15 (1996), S. 572-599 
    Details
    ISSN: 1432-0541
    Keywords: Algorithm ; Computational complexity ; Scheduling ; Periodic task ; Nonpreemptive task
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this paper we study the problem of scheduling a set of periodic tasks nonpreemptively in hard-real-time systems, where it is critical for all requests of the tasks to be processed in time. A taskT is characterized by itsarrival time A, itsperiod P, and itsexecution time C. Starting fromA, a new request ofT arrives in everyP units of time, requestingC units of processing time, and itsdeadline coincides with the arrival of the next request ofT. All requests must be processed nonpreemptively to meet their corresponding deadlines. We show that the problem of testing the feasibility of a given task set {T 1,T 2,⋯,T n} satisfyingP 1+1=ki pi, wherek i; is an integer ≥ 1 for 1≤i ≤ n−1, on a single processor is NP-hard in the strong sense, even if all tasks have the same arrival time. For task sets satisfyingP i+1=K Pi, whereK is an integer ≥ 2 for 1≤ i ≤ n−1 and all tasks have the same arrival time, we present linear-time (in the number of requests) optimal scheduling algorithms as well as linear-time (in the number of tasks, i.e.,n) algorithms for testing feasibility in both uniprocessor and multiprocessor systems. We also extend our results to more general task sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01940882
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Algorithms for Fuzzy Segmentation (1999)
    Springer
    Pattern analysis and applications 2 (1999), S. 73-81 
    Details
    ISSN: 1433-755X
    Keywords: Key words: Dynamic programming; Fuzzy pattern recognition; Greedy algorithms; Medical imaging; Segmentation; Thresholding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract: Fuzzy segmentation is an effective way of segmenting out objects in pictures containing both random noise and shading. This is illustrated both on mathematically created pictures and on some obtained from medical imaging. A theory of fuzzy segmentation is presented. To perform fuzzy segmentation, a ‘connectedness map’ needs to be produced. It is demonstrated that greedy algorithms for creating such a connectedness map are faster than the previously used dynamic programming technique. Once the connectedness map is created, segmentation is completed by a simple thresholding of the connectedness map. This approach is efficacious in instances where simple thresholding of the original picture fails.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100440050016
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  • 4
    Electronic Resource
    Electronic Resource
    Integrated TMN Service Management (1999)
    Springer
    Journal of network and systems management 7 (1999), S. 469-493 
    Details
    ISSN: 1573-7705
    Keywords: INTEGRATED SERVICE MANAGEMENT ; CUSTOMER SERVICE MANAGEMENT ; SERVICE ORDERING ; SERVICE PROVISIONING ; CONNECTION MANAGEMENT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The deregulation of the global telecommunicationindustry has seen a change in the business andoperational environment in which services are deployedand managed. The requirements have intensified toprovide a management framework for telecommunicationnetworks and services across multiple technology domainsand using multiple management technologies. This paperdescribes an integrated TMN service management architecture that provides an environment fordifferent service management functions and differentmanagement domains to be integrated. To furthersubstantiate this architecture, a system was built todemonstrate the integration concepts. The research anddevelopment work reported in this paper focuses on thefollowing two aspects of integration: first theintegration between TMN network and service managementfunctions; and next the integration between differentservice management functions. A proof of concept systemwas developed to demonstrate such integration. Itconsists of the following components: Generic service ordering and provisioning; connectionmanagement based on a generic network model concept; andservice management based upon service level agreementmanagement and customer service management concepts. This paper reports this work and theexperiences gained from this research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018744000758
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  • 5
    Electronic Resource
    Electronic Resource
    On the Componentwise Krawczyk-Moore Iteration (1999)
    Springer
    Reliable computing 5 (1999), S. 359-370 
    Details
    ISSN: 1573-1340
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this paper, we derive an existence test for zeros of nonlinear system f(x) = 0, and construct a sequence of optimal nested intervals including the solution x* of the system and give a sharper componentwise error bounds for a modified Newton method. The norm case of the mentioned method is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009928629577
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  • 6
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    Resource-Efficient Data Gathering in Sensor Networks for Environment Reconstruction (2015)
    Oxford University Press
    Details
    Publication Date: 2015-06-02
    Description: Environment reconstruction is to rebuild the physical environment in the cyberspace using the sensory data collected by sensor networks, which is a fundamental method for human to understand the physical world in depth. A lot of basic scientific work such as nature discovery and organic evolution heavily relies on the environment reconstruction. However, gathering large amount of environmental data costs huge energy and storage space. The shortage of energy and storage resources has become a major problem in sensor networks for environment reconstruction applications. Motivated by exploiting the inherent feature of environmental data, in this paper, we design a novel data gathering protocol based on compressive sensing theory and time series analysis to further improve the resource efficiency. This protocol adapts the duty cycle and sensing probability of every sensor node according to the dynamic environment, which cannot only guarantee the reconstruction accuracy, but also save energy and storage resources. We implement the proposed protocol on a 51-node testbed and conduct the simulations based on three real datasets from Intel Indoor, GreenOrbs and Ocean Sense projects. Both the experiment and simulation performances demonstrate that our method significantly outperforms the conventional methods in terms of resource efficiency and reconstruction accuracy.
    Print ISSN: 0010-4620
    Electronic ISSN: 1460-2067
    Topics: Computer Science
    Published by Oxford University Press
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  • 7
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    Recursive Partitioning Method on Competing Risk Outcomes (2016)
    Libertas Academica
    Details
    Publication Date: 2016-07-28
    Description: In some cancer clinical studies, researchers have interests to explore the risk factors associated with competing risk outcomes such as recurrence-free survival. We develop a novel recursive partitioning framework on competing risk data for both prognostic and predictive model constructions. We define specific splitting rules, pruning algorithm, and final tree selection algorithm for the competing risk tree models. This methodology is quite flexible that it can corporate both semiparametric method using Cox proportional hazards model and parametric competing risk model. Both prognostic and predictive tree models are developed to adjust for potential confounding factors. Extensive simulations show that our methods have well-controlled type I error and robust power performance. Finally, we apply both Cox proportional hazards model and flexible parametric model for prognostic tree development on a retrospective clinical study on oropharyngeal cancer patients.
    Electronic ISSN: 1176-9351
    Topics: Computer Science , Medicine
    Published by Libertas Academica
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  • 8
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    QTLMiner: QTL database curation by mining tables in literature (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-12
    Description: Motivation: Figures and tables in biomedical literature record vast amounts of important experiment results. In scientific papers, for example, quantitative trait locus (QTL) information is usually presented in tables. However, most of the popular text-mining methods focus on extracting knowledge from unstructured free text. As far as we know, there are no published works on mining tables in biomedical literature. In this article, we propose a method to extract QTL information from tables and plain text found in literature. Heterogeneous and complex tables were converted into a structured database, combined with information extracted from plain text. Our method could greatly reduce labor burdens involved with database curation. Results: We applied our method on a soybean QTL database curation, from which 2278 records were extracted from 228 papers with a precision rate of 96.9% and a recall rate of 83.3%, F value for the method is 89.6%. Availability and implementation: QTLMiner is available at www.soyomics.com/qtlminer/ . Contact: yuanxh@iga.ac.cn
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
    Published by Oxford University Press
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  • 9
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    East Asian hydroclimate modulated by the position of the westerlies during Termination I (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018
    Description: 〈p〉Speleothem oxygen isotope records have revolutionized our understanding of the paleo East Asian monsoon, yet there is fundamental disagreement on what they represent in terms of the hydroclimate changes. We report a multiproxy speleothem record of monsoon evolution during the last deglaciation from the middle Yangtze region, which indicates a wetter central eastern China during North Atlantic cooling episodes, despite the oxygen isotopic record suggesting a weaker monsoon. We show that this apparent contradiction can be resolved if the changes are interpreted as a lengthening of the Meiyu rains and shortened post-Meiyu stage, in accordance with a recent hypothesis. Model simulations support this interpretation and further reveal the role of the westerlies in communicating the North Atlantic influence to the East Asian climate.〈/p〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Synergistic sorbent separation for one-step ethylene purification from a four-component mixture (2019)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2019
    Description: 〈p〉Purification of ethylene (C〈sub〉2〈/sub〉H〈sub〉4〈/sub〉), the largest-volume product of the chemical industry, currently involves energy-intensive processes such as chemisorption (CO〈sub〉2〈/sub〉 removal), catalytic hydrogenation (C〈sub〉2〈/sub〉H〈sub〉2〈/sub〉 conversion), and cryogenic distillation (C〈sub〉2〈/sub〉H〈sub〉6〈/sub〉 separation). Although advanced physisorbent or membrane separation could lower the energy input, one-step removal of multiple impurities, especially trace impurities, has not been feasible. We introduce a synergistic sorbent separation method for the one-step production of polymer-grade C〈sub〉2〈/sub〉H〈sub〉4〈/sub〉 from ternary (C〈sub〉2〈/sub〉H〈sub〉2〈/sub〉/C〈sub〉2〈/sub〉H〈sub〉6〈/sub〉/C〈sub〉2〈/sub〉H〈sub〉4〈/sub〉) or quaternary (CO〈sub〉2〈/sub〉/C〈sub〉2〈/sub〉H〈sub〉2〈/sub〉/C〈sub〉2〈/sub〉H〈sub〉6〈/sub〉/C〈sub〉2〈/sub〉H〈sub〉4〈/sub〉) gas mixtures with a series of physisorbents in a packed-bed geometry. We synthesized ultraselective microporous metal-organic materials that were readily regenerated, including one that was selective for C〈sub〉2〈/sub〉H〈sub〉6〈/sub〉 over CO〈sub〉2〈/sub〉, C〈sub〉2〈/sub〉H〈sub〉2〈/sub〉, and C〈sub〉2〈/sub〉H〈sub〉4〈/sub〉.〈/p〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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