Search results for "Strain"

SparseHC: A Memory-efficient Online Hierarchical Clustering Algorithm

2014

Computing a hierarchical clustering of objects from a pairwise distance matrix is an important algorithmic kernel in computational science. Since the storage of this matrix requires quadratic space with respect to the number of objects, the design of memory-efficient approaches is of high importance to this research area. In this paper, we address this problem by presenting a memory-efficient online hierarchical clustering algorithm called SparseHC. SparseHC scans a sorted and possibly sparse distance matrix chunk-by-chunk. Meanwhile, a dendrogram is built by merging cluster pairs as and when the distance between them is determined to be the smallest among all remaining cluster pairs. The k…

Editorial: From Meristems to Floral Diversity: Developmental Options and Constraints

2021

Continuum: A spatiotemporal data model to represent and qualify filiation relationships

2013

International audience; This work introduces an ontology-based spatio-temporal data model to represent entities evolving in space and time. A dynamic phenomenon generates a complex relationship network between the entities involved in the process. At the abstract level, the relationships can be identity or topological filiations. The existence of an identity filiation depends on whether the object changes its identity or not. On the other hand, topological filiations are based exclusively on the spatial component, like in the case of growth, reduction, merging or splitting. When combining identity and topological filiations, six filiation relationships are obtained, forming a second abstrac…

Probabilistic and preferential sampling approaches offer integrated perspectives of Italian forest diversity

2023

Aim: Assessing the performances of different sampling approaches for documenting community diversity may help to identify optimal sampling efforts and strategies, and to enhance conservation and monitoring planning. Here, we used two data sets based on probabilistic and preferential sampling schemes of Italian forest vegetation to analyze the multifaceted performances of the two approaches across three major forest types at a large scale. Location: Italy. Methods: We pooled 804 probabilistic and 16,259 preferential forest plots as samples of vascular plant diversity across the country. We balanced the two data sets in terms of sizes, plot size, geographical position, and vegetation types. F…

Exploring long chain n-alkane metabolism in Gordonia sp. strain SoCg

2011

Eettisesti haastavat tilanteet ja niiden kuormittavuus johtajien työssä: fokusryhmäkeskusteluiden analyysi

2010

Tässä pilottitutkimuksessa tutkittiin laadullisesti johtajien työssään kokemia eettisesti haastavia tilanteita (sisällöt, kontekstit) sekä niissä koettuja ristiriitakokemuksia. Työtilanteita luokiteltiin laadullisen aineiston pohjalta. Aineisto kerättiin 16 suomalaisen johtajan fokusryhmäkeskusteluista (neljä ryhmää). Tulokset osoittivat, että johtajat kohtasivat usein työssään erilaisia eettisesti haastavia tilanteita suhteessa organisaation sidosryhmiin. Näitä sidosryhmiä olivat organisaation toimintaympäristö eli yhteiskunta, asiakkaat, omistajat sekä henkilöstö (johto, kollegat ja alaiset). Haastavien tilanteiden sisällöt jakautuivat viiteen luokkaan: 1) monimutkaiset työtilanteet, 2) r…

Regional headquarters and foreign direct investment

2022

Headquarters (HQs) provide a wide range of services, playing a fundamental role in Foreign Direct Investment (FDI). We use the structural gravity equation to investigate the effect of regional HQs on three dimensions of FDI (number of foreign projects, capital investment, and jobs) at the country-pair-sector level. Furthermore, we explore two underlying mechanisms that help explain this relationship: financial constraints and informational costs and uncertainty. We find a positive effect of regional HQs on FDI, as well as intercountry and intersector spillovers. Our results are robust, accounting for HQ intensity, domestic investment, and endogeneity tests.

Enabling and constraining family: young women building their educational paths in Tanzania

2015

For an increasing number of African girls and women, upgrading the level of education has become a strategy for life improvement. This paper analyses the role that family plays in enabling women's education and contributes to understanding on the interconnectivity of education, work and family in women's lives in collective societies. The analysis focuses on how young Tanzanian women perceive the role of family and education in their ‘youth task’, of becoming adult. The analysis is based on interviews with seven young Tanzanian women enrolled in non-formal secondary education and nine professional women enrolled in higher education. The results show that the women were determined to pursue …

Economic strain and foreign language attainment: A Polish perspective

2016

Foreign language learning is not only a personal endeavor, but also an activity that takes place within a social support system. In times of economic crisis adverse economic conditions handicap parents’ educational investments. For this reason a student’s development of foreign language skills, limited to the school context, may suffer. This study sheds more light on the experience and effect of economic strain in Polish secondary grammar school students who learn English as a foreign language. The results corroborate studies in the field and demonstrate that high achievers have low perceptions of economic strain.

A Domain Imbedding Method with Distributed Lagrange Multipliers for Acoustic Scattering Problems

2003

The numerical computation of acoustic scattering by bounded twodimensional obstacles is considered. A domain imbedding method with Lagrange multipliers is introduced for the solution of the Helmholtz equation with a second-order absorbing boundary condition. Distributed Lagrange multipliers are used to enforce the Dirichlet boundary condition on the scatterer. The saddle-point problem arising from the conforming finite element discretization is iteratively solved by the GMRES method with a block triangular preconditioner. Numerical experiments are performed with a disc and a semi-open cavity as scatterers.