The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

I. Omeri - One of the best experts on this subject based on the ideXlab platform.

L. Kolodochka - One of the best experts on this subject based on the ideXlab platform.

Yadviga Yelovicheva - One of the best experts on this subject based on the ideXlab platform.

  • hydrography and mollusc faunas of the baltic and the white sea north sea seaway in the eemian
    Palaeogeography Palaeoclimatology Palaeoecology, 2002
    Co-Authors: Svend Funder, Igor Demidov, Yadviga Yelovicheva
    Abstract:

    Abstract Palynologically dated mollusc and cirriped faunas from a region extending from the North Sea through the Baltic and Karelia to the Arkhangelsk region show that the hydrography of the Baltic was very different from the Holocene. For 2–2.5 ka in the Early Eemian a seaway existed from the Barents to the North Sea through Karelia, until it was severed at the present continental watershed to the north of Lake Onega. After this the Ladoga–Onega trough remained an arm of the Baltic for several millennia. The benthic faunas are comparable to the Holocene, but their boundaries were displaced much further into the Baltic. Notable differences from the Holocene are the absence or rarity of the Macoma balthica Biocoenosis, and the presence of cold Portlandia -dominated biocoenoses in Karelia. In the Belt Sea and western Baltic winter sea surface temperatures and salinity were higher than now by ca. 6°C and 15‰, and the distinctly brackish top layer was missing. At the same time cold bottom water (≈2.5°C) with a tendency to anoxia characterised the Karelian arm of the Baltic. Water exchange through this area was inhibited by the constriction to the north of Lake Onega, and the basin and threshold bathymetry. Water transport through the White Sea–Baltic seaway was too sparse to play an active role in the North Atlantic surface circulation or climatic change in the region. The high salinity and temperature in the Belt Sea and western Baltic persisted throughout the Eemian, and are explained by wider and deeper passage from the North Sea to Kattegat, wider straits through Denmark, higher salinity in the North Sea, higher evaporation, as well as more dispersed fresh water supply. The advection of oceanic water into the Baltic culminated in the Early Eemian, before the Carpinus zone, and probably resulted in an oceanic climate in the Baltic region, while at the same time cold winters produced cold bottom water in the Karelian arm.

Chuan-kang Ting - One of the best experts on this subject based on the ideXlab platform.

  • Evolution of Biocoenosis through symbiosis with fitness approximation for many-tasking optimization
    Memetic Computing, 2020
    Co-Authors: Rung-tzuo Liaw, Chuan-kang Ting
    Abstract:

    Memetic computing is a blooming research area, which treats memes as the fundamental building blocks of information transfer. Evolutionary multitasking is an emerging topic in memetic computation, which applies evolutionary algorithm to optimize multiple tasks at a time. A famous class of algorithms for evolutionary multitasking is the multi-factorial evolutionary algorithm (MFEA). Nevertheless, current MFEAs only consider problems with small number of tasks, resulting in a lack of effective information transfer strategy. This study proposes a framework for evolutionary multitasking, called the evolution of Biocoenosis through symbiosis with fitness approximation (EBSFA). The EBSFA incorporates evolution of Biocoenosis through symbiosis (EBS) with fitness approximation to ameliorate the information transfer. The improvement of EBSFA is three-fold, including (1) the adaptive control of information transfer among tasks, (2) the selection of individuals from the universal offspring pool for evaluation based on fitness approximation, and (3) an ensemble method for improving the accuracy of fitness approximation through k nearest neighbors. Experimental analysis verifies the effectiveness and efficiency of the proposed EBSFA, by comparison with an advanced single-tasking method, the covariance matrix adaptation evolution strategy (CMAES), an illustrious multitasking optimization method, the MFEA-II, and an evolutionary many-tasking method, the EBS on a set of many-tasking benchmark problems. The results show that EBSFA can gain nice solution quality and fast convergence speed. Further analysis validates the effectiveness of the proposed components on improving the information transfer.

  • AAAI - Evolutionary Manytasking Optimization Based on Symbiosis in Biocoenosis.
    Proceedings of the AAAI Conference on Artificial Intelligence, 2019
    Co-Authors: Rung-tzuo Liaw, Chuan-kang Ting
    Abstract:

    Evolutionary multitasking is a significant emerging search paradigm that utilizes evolutionary algorithms to concurrently optimize multiple tasks. The multi-factorial evolutionary algorithm renders an effectual realization of evolutionary multitasking on two or three tasks. However, there remains room for improvement on the performance and capability of evolutionary multitasking. Beyond three tasks, this paper proposes a novel framework, called the symbiosis in Biocoenosis optimization (SBO), to address evolutionary many-tasking optimization. The SBO leverages the notion of symbiosis in Biocoenosis for transferring information and knowledge among different tasks through three major components: 1) transferring information through inter-task individual replacement, 2) measuring symbiosis through intertask paired evaluations, and 3) coordinating the frequency and quantity of transfer based on symbiosis in Biocoenosis. The inter-task individual replacement with paired evaluations caters for estimation of symbiosis, while the symbiosis in Biocoenosis provides a good estimator of transfer. This study examines the effectiveness and efficiency of the SBO on a suite of many-tasking benchmark problems, designed to deal with 30 tasks simultaneously. The experimental results show that SBO leads to better solutions and faster convergence than the state-of-the-art evolutionary multitasking algorithms. Moreover, the results indicate that SBO is highly capable of identifying the similarity between problems and transferring information appropriately.

  • evolutionary manytasking optimization based on symbiosis in Biocoenosis
    National Conference on Artificial Intelligence, 2019
    Co-Authors: Rung-tzuo Liaw, Chuan-kang Ting
    Abstract:

    Evolutionary multitasking is a significant emerging search paradigm that utilizes evolutionary algorithms to concurrently optimize multiple tasks. The multi-factorial evolutionary algorithm renders an effectual realization of evolutionary multitasking on two or three tasks. However, there remains room for improvement on the performance and capability of evolutionary multitasking. Beyond three tasks, this paper proposes a novel framework, called the symbiosis in Biocoenosis optimization (SBO), to address evolutionary many-tasking optimization. The SBO leverages the notion of symbiosis in Biocoenosis for transferring information and knowledge among different tasks through three major components: 1) transferring information through inter-task individual replacement, 2) measuring symbiosis through intertask paired evaluations, and 3) coordinating the frequency and quantity of transfer based on symbiosis in Biocoenosis. The inter-task individual replacement with paired evaluations caters for estimation of symbiosis, while the symbiosis in Biocoenosis provides a good estimator of transfer. This study examines the effectiveness and efficiency of the SBO on a suite of many-tasking benchmark problems, designed to deal with 30 tasks simultaneously. The experimental results show that SBO leads to better solutions and faster convergence than the state-of-the-art evolutionary multitasking algorithms. Moreover, the results indicate that SBO is highly capable of identifying the similarity between problems and transferring information appropriately.

Maja Novosel - One of the best experts on this subject based on the ideXlab platform.

  • Bryozoans of the Adriatic Sea
    2005
    Co-Authors: Maja Novosel
    Abstract:

    Bryozoans of the eastern Adriatic Sea are presented through the distribution and characte- ristics of the dominant species in the main benthic ecosystems: rocky bottoms, seagrass Posidonia ocean- ica (L.) DELILE meadows, marine caves and soft bottoms. Bryozoan assemblages were surveyed and sam- pled from 22 sites along the eastern Adriatic Sea coast. Among surveyed biocoenoses, the coralligenous Biocoenosis harboured the largest diversity in bryozoans, followed by semi-cave Biocoenosis, biocoeno- sis of seagrass Posidonia oceanica meadow and Biocoenosis of photophilic algae. Some particular bryozo- an assemblages such as large bryozoans that live under the influence of submarine freshwater springs ("vruljas"), on the magmatic rocks, dense meadow of Celhria fistulosa and C. salicomioides and meadow of Margaretw cereoides were also discussed. The bryozoan assemblages of the Adriatic Sea correspond in general to those of the Mediterranean Sea. Since about 400 species have been recorded in the Medi- terranean and only 222 species in the eastern Adriatic, future researches are expected to confirm much larger bryozoan diversity in the eastern Adriatic Sea.

  • The benthos of the northern part of the Velebit Channel (Adriatic Sea, Croatia)
    2002
    Co-Authors: Maja Novosel, Tatjana Bakran-petricioli, Antonieta Požar-domac, Petar Kružić, Ivan Radić
    Abstract:

    Novosel, M., Bakran-Petricioli, T., Po`ar-Domac, A., Kru`i}, P. & Radi}, I.: The benthos of the northern part of the Velebit Channel (Adriatic Sea, Croatia). Nat. Croat., Vol. 11, No. 4., 387–409, 2002, Zagreb. Infralittoral and circalittoral hard bottom communities in the northern part of the Velebit Channel were investigated. The benthos was collected along six transects: three on Prvi} Island ([ilo, Samonjin and Stra`ica) and three facing them along the Velebit mountain coast (Grmac, @rnovnica and Kola). Three benthic biocoenoses were noted: the Biocoenosis of photophilic algae, precoralligenous facies and a climax of coralligenous Biocoenosis, and the Biocoenosis of semi-dark caves. A total of 431 taxa were recorded: 60 taxa of algae and 371 taxa of fauna. Along the three coastal transects under Mt Velebit numerous submarine freshwater springs (vruljas) are present. The results were compared using two statistical methods: the application of the Sorensen index of similarity and cluster analysis. The most topographically and geomorphologically similar transects were [ilo and Samonjin, while Stra`ica and @rnovnica were the most distant.