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Wyświetlanie 1-10 z 28
Tytuł:
Tidewater glaciers as feeding spots for the Black-legged Kittiwake (Rissa tridactyla): A citizen science approach
Autorzy:
Dragańska-Deja, Katarzyna
Błaszczyk, Małgorzata
Deja, Kajetan
Węsławski, Jan Marcin
Rodak, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2041837.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
glacial bays
seabirds
gulls
foraging
Źródło:
Polish Polar Research; 2020, 41, 1; 69-93
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary computation approaches to tip position controller design for a two-link flexible manipulator
Autorzy:
Subudhi, B.
Ranasingh, S.
Swain, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/229971.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
flexible manipulator
genetic algorithm
bacteria foraging
fitness function
Opis:
Controlling multi-link flexible robots is very difficult compared rigid ones due to inter-link coupling, nonlinear dynamics, distributed link flexure and under-actuation. Hence, while designing controllers for such systems the controllers should be equipped with optimal gain parameters. Evolutionary Computing (EC) approaches such as Genetic Algorithm (GA), Bacteria Foraging Optimization (BFO) are popular in achieving global parameter optimizations. In this paper we exploit these EC techniques in achieving optimal PD controller for controlling the tip position of a two-link flexible robot. Performance analysis of the EC tuned PD controllers applied to a two-link flexible robot system has been discussed with number of simulation results.
Źródło:
Archives of Control Sciences; 2011, 21, 3; 269-285
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust design of power system stabilizer using bacterial foraging algorithm
Autorzy:
Abdul Hameed, K.
Palani, S.
Powiązania:
https://bibliotekanauki.pl/articles/141194.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bacterial foraging algorithm
power system stabilizer
power system stability
Opis:
In this paper, a novel bacterial foraging algorithm (BFA) based approach for robust and optimal design of PID controller connected to power system stabilizer (PSS) is proposed for damping low frequency power oscillations of a single machine infinite bus bar (SMIB) power system. This paper attempts to optimize three parameters (Kp, Ki, Kd) of PID-PSS based on foraging behaviour of Escherichia coli bacteria in human intestine. The problem of robustly selecting the parameters of the power system stabilizer is converted to an optimization problem which is solved by a bacterial foraging algorithm with a carefully selected objective function. The eigenvalue analysis and the simulation results obtained for internal and external disturbances for a wide range of operating conditions show the effectiveness and robustness of the proposed BFAPSS. Further, the time domain simulation results when compared with those obtained using conventional PSS and Genetic Algorithm (GA) based PSS show the superiority of the proposed design.
Źródło:
Archives of Electrical Engineering; 2013, 62, 1; 141-152
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in body mass and body reserves of breeding Little Auks (Alle alle L.)
Autorzy:
Taylor, Jan R. E.
Powiązania:
https://bibliotekanauki.pl/articles/2052688.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
Little Auk
body reserves
body composition
foraging
Źródło:
Polish Polar Research; 1994, 15, 3-4; 147-168
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Enhanced Approach for Image Edge Detection Using Histogram Equalization (BBHE) and Bacterial Foraging Optimization (BFO)
Autorzy:
Kumar, Praveen
Jindal, Tanvi
Raj, Balwinder
Powiązania:
https://bibliotekanauki.pl/articles/2200715.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
edge detection
bacterial foraging optimization
BBHE
images processing
graphics
Opis:
The Edge detection is a customarily task. Edge detection is the main task to perform as it gives clear information about the images. It is a tremendous device in photograph processing gadgets and computer imaginative and prescient. Previous research has been done on moving window approach and genetic algorithms. In this research paper new technique, Bacterial Foraging Optimization (BFO) is applied which is galvanized through the social foraging conduct of Escherichia coli (E.coli). The Bacterial Foraging Optimization (BFO) has been practice by analysts for clarifying real world optimization problems arising in different areas of engineering and application domains, due to its efficiency. The Brightness preserving bi-histogram equalization (BHEE) is another technique that is used for edge enhancement. The BFO is applied on the low level characteristics on the images to find the pixels of natural images and the values of F-measures, recall(r) and precision (p) are calculated and compared with the previous technique. The enhancement technique i.e. BBHE is carried out to improve the information about the pictures.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 4; 875--880
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The multi-constrained multicast routing improved by hybrid bacteria foraging-particle swarm optimization
Autorzy:
Sahoo, Satya Prakash
Kabat, Manas Ranjan
Powiązania:
https://bibliotekanauki.pl/articles/305674.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
QoS routing
multicasting
bacteria foraging optimization
particle swarm optimization (PSO)
Opis:
To solve multicast routing under multiple constraints, it is required to generate a multicast tree that ranges from a source to the destinations with minimum cost subject to several constraints. In this paper, PSO has been embedded with BFO to improve the convergence speed and avoid premature convergence that will be used for solving QoS multicast routing problem. The algorithm proposed here generates a set of delay compelled links to every destination present in the multicast group. Then the Bacteria Foraging Algorithm (BFA) selects the paths to all the destinations sensibly from the set of least delay paths to construct a multicast tree. The robustness of the algorithm being proposed had been established through the simulation. The efficiency and effectiveness of the algorithm being proposed was validated through the comparison study with other existing meta-heuristic algorithms. It shows that our proposed algorithm IBF-PSO outperforms its competitive algorithms.
Źródło:
Computer Science; 2019, 20 (2); 245-269
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Habitat preference and resource utilization of avifauna in Kuldiha Wildlife Sanctuary, Odisha, India: Role of eco-ethological gradients
Autorzy:
Ghosh, Srinjana
Paria, Santu
Mardaraj, Prakash Chandra
Chakraborty, Susanta Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1177424.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Avifaunal diversity
Conservation
Foraging guilds
Kuldiha Wildlife Sanctuary (KWS)
Tropical deciduous forest
Opis:
The present study has attempted to highlight the avifaunal diversity in two contrasting seasons (pre and post monsoons) from a protected tropical mixed deciduous forest (Kuldiha Wildlife Sanctuary, KWS) in the state of Odisha, India. Through modified line transect method, a total of 107 species of birds belonging to 49 families under 15 orders have been reported. Among them, 12 are winter visitors, 3 are summer visitors, 1 is near threatened and 1 is vulnerable species. Insectivores and frugivores constitute major foraging guilds. Closed canopy forests, forest edges, woodland areas and wetlands provide suitable habitats to all those avifauna. Lower canopy level was found to act as the major microhabitat for several species for meeting major ecobiological attributes of avifauna. The pre-monsoon and monsoon periods have appeared to be the ideal nesting seasons for most of the avian members. Canopy foliage and tree holes were seen to offer the most suitable nesting sites. Significant differences in respect of species richness have been observed among different habitats in different seasons (F5.91 ,p ≤ 0 in premonsoon, F6.53, p ≤ 0 in post monsoon). The highest Shannon Weiner diversity index (H′) was recorded from the forest edge (3.8) during premonsoon and that of lowest in orchard or plantation areas (2.96) during post monsoon. Species Dominance value (D) was observed to be highest both for grassland and orchards and plantation areas (0.06). The field based study attempts to assess avian diversity (qualitative and quantitative) in the light of global conservation programme. Though this area is prone to varying levels of anthropogenic interventions particularly the tourism activities, an overall healthy bird diversity has been found to exist, the knowledge on which is expected to be utilized for the holistic eco-management of forest ecosystem in general and Kuldiha wildlife sanctuary in particular. A number of hypothesis have been proposed in respect of avifaunal habitat selection, diversity and acclimation with wildlife friendly human association for their successful coexistence.
Źródło:
World Scientific News; 2018, 103; 32-64
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary computing approaches to optimum design of fuzzy logic controller for a flexible robot system
Autorzy:
Subudhi, B.
Ranasingh, S.
Powiązania:
https://bibliotekanauki.pl/articles/230107.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
flexible manipulator
fuzzy logic
genetic algorithm
bacteria foraging optimization
tip position tracking
Opis:
This paper presents the design of a Fuzzy Logic Controller (FLC) whose parameters are optimized by using Genetic Algorithm (GA) and Bacteria Foraging Optimization (BFO) for tip position control of a single link flexible manipulator. The proposed FLC is designed by minimizing the fitness function, which is defined as a function of tip position error, through GA and BFO optimization algorithms achieving perfect tip position tracking of the single link flexible manipulator. Then the tip position responses obtained by using both the above controllers are compared to suggest the best controller for the tip position tracking.
Źródło:
Archives of Control Sciences; 2013, 23, 4; 395-412
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flowering, nectar secretion, pollen shed and insect foraging on Aquilegia vulgaris L. (Ranunculaceae)
Kwitnienie, sekrecja nektaru, pylenie oraz oblot przez owady kwiatów Aquilegia vulgaris L. (Ranunculaceae)
Autorzy:
Denisow, B.
Anton, S.
Powiązania:
https://bibliotekanauki.pl/articles/28006.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
flowering
nectar secretion
pollen production
blooming dynamics
insect foraging
Aquilegia vulgaris
Ranunculaceae
pollinator composition
Opis:
This study on blooming biology, nectar secretion, pollen production and insect visitation of Aquilegia vulgaris L. was carried out in 2009 and 2011 in Lublin. The peak of flower opening during the day was between 5.00 and 7.00 (GMT +2). The flowers are protandrous with the female phase beginning approx. on the 3rd day of anthesis. The dynamics of nectar secretion and pollen shed from anthers (progressing from the central part of the androecium outwards) support the reproductive system. The amount of nectar accumulated in the spurs increased from the bud stage and was the highest in the phase with approx. ¾ of dehisced anthers, usually on the 3rd day of flower life. Then, towards the end of anthesis, the amount of secreted and accumulated nectar decreased. The number of anthers developed per flower varied from 41 to 61 (mean = 49.1). The mass of pollen per 100 anthers averaged 6.7 mg. Pollen production per flower (mean = 3.28 mg) slightly varied between years and was mainly correlated with the number of developed anthers. Estimated pollen yield was 1.69 g per m2 and sugar yield 1.22 g per m2. Species from the genus Bombus were the main flower visitors, with B. terrestris being the most frequent forager.
Badania biologii kwitnienia, nektarowania, pylenia oraz oblotu przez owady orlika pospolitego (Aquilegia vulgaris L.) prowadzono w latach 2009 i 2011 w Lublinie. W ciągu dnia szczyt kwitnienia przypada w godzinach pomiędzy 5.00 a 7.00 (GMT + 2). W protandrycznych kwiatach faza funkcjonalnie żeńska rozpoczyna się przeciętnie w 3 dniu życia kwiatu. Dynamika sekrecji nektaru oraz uwalnianie pyłku z pylników (postępujące od wewnątrz do zewnątrz androecium) wspomagają system reprodukcyjny gatunku. Ilość nektaru gromadzonego w ostrogach wzrasta sukcesywnie od stadium pąka i maksymalną wartość osiąga w fazie, gdy przeciętnie ¾ pylników w kwiecie zakończyło już proces pylenia. Od tego momentu ilość gromadzonego w kwiatach nektaru spadała. Liczba pylników w kwiatach waha się od 41 do 61 (średnio = 49.1). Przeciętna masa produkowanego pyłku wynosi 6,7 mg ze 100 pylników oraz 3,28 mg z 10 kwiatów. Pomiędzy latami badań wystąpiły wahania masy pyłku dostarczanego przez kwiaty, co korelowało dodatnio ze zmienną liczbą wytwarzanych pręcików. Oszacowana wydajność pyłkowa wyniosła 1,69 g z 1 m2 , a cukrowa 1,22 g z 1 m2. Gatunki z rodzaju Bombus były głównymi owadami wizytującymi kwiaty, a Bombus terrestris pojawiał się z najwyższą frekwencją.
Źródło:
Acta Agrobotanica; 2012, 65, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Setpoint weighted PID controller tuning for unstable system using heuristic algorithm
Autorzy:
Rajinikanth, V.
Latha, K.
Powiązania:
https://bibliotekanauki.pl/articles/229344.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
setpoint weighted PID
unstable system
particle swarm optimization (PSO)
bacterial foraging optimization
objective function
Opis:
Most of the real time chemical process loops are unstable in nature and designing a suitable controller for such systems are difficult than open loop stable processes. In this work, an attempt is made with a two degree of freedom setpoint weighted PID controller tuning procedure for a class of unstable systems using the recent heuristic algorithms such as Particle Swarm Optimization and Bacterial Foraging Optimization. The problem considered in this study is to aptly tune the controller in order to enhance the overall closed loop performance. A novel objective function proposed in this study is used to monitor the heuristic algorithms in order to get the optimal controller parameters like Kp, Ki, Kd, and alpha with minimized iteration number. The proposed method is validated with a simulation study and this helps to accomplish enhanced system performance such as smooth reference tracking, satisfactory disturbance rejection, and error minimization for a class of unstable systems.
Źródło:
Archives of Control Sciences; 2012, 22, 4; 481-505
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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