scholarly journals Optimal Scheduling of a Microgrid Using Multiobjective Biogeography-Based Optimization Model and Algorithm with Adaptive Migration

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Bo Li ◽  
Jue Wang ◽  
Nan Xia
Keyword(s):  
Pareto Frontier ◽  
Evolutionary Model ◽  
Optimal Scheduling ◽  
Constraint Handling ◽  
Migration Strategy ◽  
Suitability Index ◽  
Proposed Model ◽  
Convergence Performance ◽  
Distribution Uniformity ◽  
And Migration

Aiming at the important research topic of optimal scheduling in the microgrid field, the general model for multiobjective dynamic optimal scheduling of a microgrid is established with the objective of minimizing economic and environmental costs. On this basis, the model is organically integrated with constraint handling technology, multiobjective optimization, and biogeography-based optimization algorithm, and then a constrained multiobjective evolutionary model suitable for biogeography-based optimization is further established. The corresponding constraint handling mechanism, the determination method of habitat suitability index, and migration strategy are improved, and the convergence performance and the distribution uniformity of Pareto frontier for multiobjective evolutionary algorithm are effectively enhanced. Applied to the optimal scheduling of typical microgrid systems, the effectiveness of the proposed model and method is verified.

scholarly journals Prevalence and genetic diversity of avian haemosporidian parasites in wild bird species of the order Columbiformes

2021 ◽  
Author(s):  
Yvonne R. Schumm ◽  
Dimitris Bakaloudis ◽  
Christos Barboutis ◽  
Jacopo G. Cecere ◽  
Cyril Eraud ◽  
...  
Keyword(s):  
Host Species ◽  
Large Scale ◽  
Phylogenetic Reconstruction ◽  
Bird Species ◽  
Avian Species ◽  
Blood Parasites ◽  
Migration Strategy ◽  
Haemosporidian Parasites ◽  
Multiplex Pcr Assay ◽  
And Migration

AbstractDiseases can play a role in species decline. Among them, haemosporidian parasites, vector-transmitted protozoan parasites, are known to constitute a risk for different avian species. However, the magnitude of haemosporidian infection in wild columbiform birds, including strongly decreasing European turtle doves, is largely unknown. We examined the prevalence and diversity of haemosporidian parasites Plasmodium, Leucocytozoon and subgenera Haemoproteus and Parahaemoproteus in six species of the order Columbiformes during breeding season and migration by applying nested PCR, one-step multiplex PCR assay and microscopy. We detected infections in 109 of the 259 screened individuals (42%), including 15 distinct haemosporidian mitochondrial cytochrome b lineages, representing five H. (Haemoproteus), two H. (Parahaemoproteus), five Leucocytozoon and three Plasmodium lineages. Five of these lineages have never been described before. We discriminated between single and mixed infections and determined host species-specific prevalence for each parasite genus. Observed differences among sampled host species are discussed with reference to behavioural characteristics, including nesting and migration strategy. Our results support previous suggestions that migratory birds have a higher prevalence and diversity of blood parasites than resident or short-distance migratory species. A phylogenetic reconstruction provided evidence for H. (Haemoproteus) as well as H. (Parahaemoproteus) infections in columbiform birds. Based on microscopic examination, we quantified parasitemia, indicating the probability of negative effects on the host. This study provides a large-scale baseline description of haemosporidian infections of wild birds belonging to the order Columbiformes sampled in the northern hemisphere. The results enable the monitoring of future changes in parasite transmission areas, distribution and diversity associated with global change, posing a potential risk for declining avian species as the European turtle dove.

A replication and migration strategy on the hierarchical architecture in the fog computing environment

2020 ◽  
Vol 16 (3) ◽  
pp. 291-307
Author(s):  
Ahmed Berkennou ◽  
Ghalem Belalem ◽  
Said Limam
Keyword(s):  
Fog Computing ◽  
Hierarchical Architecture ◽  
Computing Environment ◽  
Huge Amount ◽  
Migration Strategy ◽  
Replication Strategy ◽  
Promising Solution ◽  
Network Usage ◽  
And Migration ◽  
Do So

Connecting objects have increasingly become popular in recent years, leading to the connection of more than 50 billion objects by the end of 2020. This large number of objects will generate a huge amount of data that is currently being processed and stored in the cloud. Fog Computing presents a promising solution to the problems of high latency and huge network traffic encountered in the cloud. As Fog’s infrastructures are dense, heterogeneous and geo-distributed, managing the data in order to satisfy users demand in such context is very complicated. In this work, we propose a data management strategy called ‘RMS-HaFC’ in which we consider the characteristics of Fog Computing environment. To do so, we proposed a hierarchical multi-layer model, on which we designed a migration and replication strategy based on data popularity. These strategies duplicate files dynamically and store them in different locations to improve the response time of users requests and minimize the system energy consumption without loading network usage. The strategy was evaluated using the iFogSim simulator and the experimental results obtained are very promising.

Ada-Things: An adaptive virtual machine monitoring and migration strategy for internet of things applications

2019 ◽  
Vol 132 ◽  
pp. 164-176 ◽  
Author(s):  
Zhong Wang ◽  
Daniel Sun ◽  
Guangtao Xue ◽  
Shiyou Qian ◽  
Guoqiang Li ◽  
...  
Keyword(s):  
Internet Of Things ◽  
Virtual Machine ◽  
Migration Strategy ◽  
Machine Monitoring ◽  
And Migration

Uncertain Technology Evolution and Decision Making in Design

2012 ◽  
Vol 134 (10) ◽  
Author(s):  
Jonathan L. Arendt ◽  
Daniel A. McAdams ◽  
Richard J. Malak
Keyword(s):  
Research And Development ◽  
Pareto Frontier ◽  
Evolutionary Process ◽  
Evolutionary Model ◽  
Development Effort ◽  
Technology Evolution ◽  
Curve Model ◽  
S Curve ◽  
Over Time

The potential for engineering technology to evolve over time can be a critical consideration in design decisions that involve long-term commitments. Investments in manufacturing equipment, contractual relationships, and other factors can make it difficult for engineering firms to backtrack once they have chosen one technology over others. Although engineering technologies tend to improve in performance over time, competing technologies can evolve at different rates and details about how a technology might evolve are generally uncertain. In this article we present a general framework for modeling and making decisions about evolving technologies under uncertainty. In this research, the evolution of technology performance is modeled as an S-curve; the performance evolves slowly at first, quickly during heavy research and development effort, and slowly again as the performance approaches its limits. We extend the existing single-attribute S-curve model to the case of technologies with multiple performance attributes. By combining an S-curve evolutionary model for each attribute with a Pareto frontier representation of the optimal implementations of a technology at a particular point in time, we can project how the Pareto frontier will move over time as a technology evolves. Designer uncertainty about the precise shape of the S-curve model is considered through a Monte Carlo simulation of the evolutionary process. To demonstrate how designers can apply the framework, we consider the scenario of a green power generation company deciding between competing wind turbine technologies. Wind turbines, like many other technologies, are currently evolving as research and development efforts improve performance. The engineering example demonstrates how the multi-attribute technology evolution modeling technique provides designers with greater insight into critical uncertainties present in long-term decision problems.

scholarly journals Simple rules guide dragonfly migration

2006 ◽  
Vol 2 (3) ◽  
pp. 325-329 ◽  
Author(s):  
Martin Wikelski ◽  
David Moskowitz ◽  
James S Adelman ◽  
Jim Cochran ◽  
David S Wilcove ◽  
...  
Keyword(s):  
Decision Rules ◽  
Population Level ◽  
Long Distance ◽  
Migration Strategy ◽  
Anax Junius ◽  
Wind Speeds ◽  
Radio Transmitters ◽  
Migratory Patterns ◽  
And Migration ◽  
Made In

Every year billions of butterflies, dragonflies, moths and other insects migrate across continents, and considerable progress has been made in understanding population-level migratory phenomena. However, little is known about destinations and strategies of individual insects. We attached miniaturized radio transmitters ( ca 300 mg) to the thoraxes of 14 individual dragonflies (common green darners, Anax junius ) and followed them during their autumn migration for up to 12 days, using receiver-equipped Cessna airplanes and ground teams. Green darners exhibited distinct stopover and migration days. On average, they migrated every 2.9±0.3 days, and their average net advance was 58±11 km in 6.1±0.9 days (11.9±2.8 km d −1 ) in a generally southward direction (186±52°). They migrated exclusively during the daytime, when wind speeds were less than 25 km h −1 , regardless of wind direction, but only after two nights of successively lower temperatures (decrease of 2.1±0.6 °C in minimum temperature). The migratory patterns and apparent decision rules of green darners are strikingly similar to those proposed for songbirds, and may represent a general migration strategy for long-distance migration of organisms with high self-propelled flight speeds.

PEMBANGUNAN DESA-KOTA DI INDONESIA DARI PERSPEKTIF PENGEMBANGAN WILAYAH DAN MIGRASI

2017 ◽  
Vol 15 (2) ◽  
pp. 124
Author(s):  
Ranggi Ade Febrian
Keyword(s):  
Regional Development ◽  
Rural Areas ◽  
Urban Areas ◽  
Poverty Rate ◽  
Poor People ◽  
Migration Strategy ◽  
Urban Inequality ◽  
Urban And Rural Areas ◽  
And Migration ◽  
Development Paradigm

The problem of rural-urban inequality can not be separated from the development paradigm that assumes thatconsidered better urban and rural areas are higher or the subordination of urban areas. The problem is growingwith the increasing levels of poverty in Indonesia, which was recorded by the BPS period March 2015 as much as28.59 million (11.22% of the total population of Indonesia) in both urban (10.65 million) and rural (17.94million soul). The poverty rate is increasing 860 thousand inhabitants of 27.73 million people in the period ofSeptember 2014, with details of the number of poor people in urban areas amounted to 10.36 million and 17.37million rural people. This paper attempts to analyze the development of villages and cities in Indonesia from theperspective of regional development and migration. Strategy is needed in rural development the city is by adopt-ing the concept of regional development and migration that it contains substances sustainable development ofboth macro and micro, so the construction of rural cities will be able to run well and in line with the Nawa Citathird Indonesian development of the region penggiran by strengthening areas and villages within the frameworkof the Unitary Republic of Indonesia.

Environmental habitat use and migration of Plecoglossidae and Osmeridae fish

2008 ◽  
Vol 88 (3) ◽  
pp. 637-640
Author(s):  
Madoka Ohji ◽  
Aya Kotake ◽  
Takaomi Arai
Keyword(s):  
Life Histories ◽  
Full Range ◽  
Behavioural Plasticity ◽  
Migration Strategy ◽  
Freshwater Environment ◽  
Migration Patterns ◽  
Otolith Sr:Ca Ratios ◽  
Sr:Ca Ratios ◽  
And Migration ◽  
High Degree

The life histories of Plecoglossidae and Osmeridae fish collected from Japanese fresh, brackish, and seawaters were studied by examining the strontium (Sr) to calcium (Ca) ratios in their otoliths. The Sr:Ca ratios in the otoliths changed with the salinity of the habitat. The fish living in a freshwater environment showed consistently low Sr:Ca ratios throughout the otolith. The fish were identified as a standard freshwater type. In contrast, fish collected from the intertidal zone showed higher otolith Sr:Ca ratios than those in the standard freshwater type, and the ratios fluctuated along the growth phase. In the present study, in addition to the representative migration pattern reported previously, other migration patterns were found to show consistently high Sr:Ca ratios throughout the otolith in several Osmeridae fish. Those results indicate that these fish have a flexible migration strategy with a high degree of behavioural plasticity and an ability to utilize the full range of salinity throughout their life history.

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