Institution
Tampere University of Technology
About: Tampere University of Technology is a based out in . It is known for research contribution in the topics: Laser & Context (language use). The organization has 6802 authors who have published 19787 publications receiving 431793 citations. The organization is also known as: Tampereen teknillinen yliopisto.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, various schemes for correcting the finite-size supercell errors in the case of charged defect calculations are analyzed and their performance for a series of defect systems is compared.
Abstract: Various schemes for correcting the finite-size supercell errors in the case of charged defect calculations are analyzed and their performance for a series of defect systems is compared. We focus on the schemes proposed by Makov and Payne (MP), Freysoldt, Neugebauer, and Van de Walle (FNV), and Lany and Zunger (LZ). The role of the potential alignment is also assessed. We demonstrate a connection between the defect charge distribution and the potential alignment, which establishes a relation between the MP and FNV schemes. Calculations are performed using supercells of various sizes and the corrected formation energies are compared to the values obtained by extrapolation to infinitely large supercells. For defects with localized charge distributions, we generally find that the FNV scheme improves upon the LZ one, while the MP scheme tends to overcorrect except for point-charge-like defects. We also encountered a class of defects, for which all the correction schemes fail to produce results consistent with the extrapolated values. This behavior is found to be caused by partial delocalization of the defect charge. We associate this effect to hybridization between the defect state and the band-edge states of the host. The occurrence of defect charge delocalization also reflects in the evolution of the defect Kohn-Sham levels with increasing supercell size. We discuss the physical relevance of the latter class of defects.
341 citations
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TL;DR: A simple digital format supporting the technical aspects of exchange and storage of polygraphic signals has been specified and has made it possible to create a common database of sleep records, and to compare the analysis algorithms local to the various laboratories to each other.
336 citations
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TL;DR: This article identifies and assesses measurement approaches for two different purposes: determining the value of BI and managing the BI process within an organization.
Abstract: Based on a literature review, this article identifies and assesses measurement approaches for two different purposes: determining the value of BI and managing the BI process within an organization.
333 citations
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17 Aug 1983TL;DR: A method for transforming centralized action systems into decentralized ones is described and the correctness of this method is proved, and its use is illustrated by deriving a process net that distributedly sorts successive lists of integers.
Abstract: The behavior of a net of interconnected, communicating processes is described in terms of the joint actions in which the processes can participate. A distinction is made between centralized and decentralized action systems. In the former, a central agent with complete information about the state of the system controls the execution of the actions; in the latter no such agent is needed. Properties of joint action systems are expressed in temporal logic. Centralized action systems allow for simple description of system behavior. Decentralized (two-process) action systems again can be mechanically compiled into a collection of CSP processes. A method for transforming centralized action systems into decentralized ones is described. The correctness of this method is proved, and its use is illustrated by deriving a process net that distributedly sorts successive lists of integers.
333 citations
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TL;DR: In this paper, the authors investigate the process of knowledge transfer in project-based organizations from the perspective of organizational culture and highlight the importance of organizational and project cultures in this process.
Abstract: This conceptual paper investigates the process of knowledge transfer in project-based organizations from the perspective of organizational culture. The paper identifies obstacles to knowledge transfer in project-based organizations and emphasizes the importance of organizational and project cultures in this process. The study provides some suggestions for improving knowledge transfer in project-based organizations and notes the implications of the paper for project management.
329 citations
Authors
Showing all 6802 results
Name | H-index | Papers | Citations |
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Terho Lehtimäki | 142 | 1304 | 106981 |
Prashant V. Kamat | 140 | 725 | 79259 |
Ian F. Akyildiz | 117 | 612 | 99653 |
Shunichi Fukuzumi | 111 | 1256 | 52764 |
Tetsuo Nagano | 96 | 490 | 34267 |
Andreas Hirsch | 90 | 778 | 36173 |
Ralf Metzler | 86 | 511 | 34793 |
Teuvo L.J. Tammela | 84 | 630 | 32847 |
Hiroshi Imahori | 79 | 472 | 24047 |
Yasuteru Urano | 79 | 356 | 24884 |
Jiri Matas | 78 | 345 | 44739 |
Piet N.L. Lens | 77 | 633 | 23367 |
Nail Akhmediev | 76 | 469 | 24205 |
Luis Echegoyen | 74 | 576 | 20094 |
Ilpo Vattulainen | 73 | 325 | 16445 |