Results 111 to 120 of about 7,174 (250)

A spectral analysis extension to DEMATEL for strategic leverage points identification

International Transactions in Operational Research, EarlyView.
Abstract Efforts to intervene in complex systems often emphasize influential factors, yet system behavior is equally shaped by the relationships among them. Methods such as Decision‐Making Trial and Evaluation Laboratory (DEMATEL) map causal structures but remain descriptive and do not identify which relationships provide the greatest leverage for ...
Pavlos Delias, Kerasia Kalkitsa
wiley   +1 more source

On restricted nonnegative matrix factorization

, 2016
Nonnegative matrix factorization (NMF) is the problem of decomposing a given nonnegative n × m matrix M into a product of a nonnegative n × d matrix W and a nonnegative d × m matrix H. Restricted NMF requires in addition that the column spaces of M and W
Kiefer, Stefan, Chistikov, D, Shirmohammadi, M, Worrell, J, Marusic, Ines, Worrell, James, Kiefer, SM, Kiefer, S., Shirmohammadi, M., Marusic, I, Shirmohammadi, Mashsa, Marusic, I., Shirmohammadi, Mahsa, Worrell, J., Chistikov, D., Kiefer, S, Chistikov, Dmitry   +16 more
core   +1 more source

Product Positioning and Incentives to Innovate

Journal of Economics &Management Strategy, EarlyView.
ABSTRACT This paper shows that product positioning affects the incentives to invest in process innovation. The result is found using a model of price competition with three firms under horizontal product differentiation—and then extended to a more general Bertrand triopoly.
Emanuele Bacchiega, Paolo G. Garella
wiley   +1 more source

Nonnegative matrix factorization of a correlation matrix

, 2009
We present a dedicated algorithm for the nonnegative factorization of a correlation matrix from an application in financial engineering. We look for a low-rank approximation. The origin of the problem is discussed in some detail.
van Kan, J.J.I.M., Oosterlee, C.W. (Kees), Sonneveld, P., Kan, J.J.I.M. van, Oosterlee, C.W., Huang, X.   +5 more
core   +1 more source

Simplex‐based model for nanoparticle grain identification in four‐dimensional scanning transmission electron microscopy data

Journal of Microscopy, EarlyView.
Abstract Grain identification in polycrystalline nanoparticles, for example, determining which crystal phases are present at each spatial location, is fundamental to materials characterisation. This is particularly challenging when grains overlap extensively, as commonly occurs in four‐dimensional scanning transmission electron microscopy (4D‐STEM ...
Wei Liu, Roberto dos Reis, Chad A. Mirkin, Vinayak P. Dravid, Wei Chen, Daniel W. Apley   +5 more
wiley   +1 more source

The Mixed Gamble of Competitive Dynamics in Family‐Controlled Firms

Journal of Management Studies, EarlyView.
Abstract We extend the mixed gamble perspective to explain how family‐controlled firms frame and evaluate the difficult trade‐off between potential gains and losses in financial wealth (FW) and socioemotional wealth (SEW) when pursuing portfolio‐level strategic initiatives, as captured by competitive aggressiveness and complexity.
Jaeyoung Cho, Alfredo De Massis, Josip Kotlar   +2 more
wiley   +1 more source

UNMF: a unified nonnegative matrix factorization for multi-dimensional omics data. [PDF]

Brief Bioinform, 2023
Abe K, Shimamura T.
europepmc   +1 more source

Sequential Outlier Detection in Nonstationary Time Series

Journal of Time Series Analysis, EarlyView.
ABSTRACT A novel method for sequential outlier detection in nonstationary time series is proposed. The method tests the null hypothesis of “no outlier” at each time point, addressing the multiple testing problem by bounding the error probability of successive tests, using extreme‐value theory. The asymptotic properties of the test statistic are studied
Florian Heinrichs, Patrick Bastian, Holger Dette   +2 more
wiley   +1 more source

A structured nonnegative matrix factorization for source separation

, 2015
International audienceIn this paper, we propose a new unconstrained nonnegative matrix factorization method designed to utilize the multilayer structure of audio signals to improve the quality of the source separation.
Matthieu Kowalski, Gael Richard, Helene Papadopoulos, Richard, Gael, Clement Laroche, Kowalski, Matthieu, Papadopoulos, Hélène, Laroche, Clément   +7 more
core   +2 more sources

Global and Local Similarity Learning in Multi-Kernel Space for Nonnegative Matrix Factorization. [PDF]

Knowl Based Syst, 2023
Peng C, Hou X, Chen Y, Kang Z, Chen C, Cheng Q.   +5 more
europepmc   +1 more source