Search results for "Cosine"
showing 10 items of 88 documents
A Novel Multidimensional Scaling Technique for Mapping Word-Of-Mouth Discussions
2009
The techniques which utilize Multidimensional Scaling (MDS) as a fundamental statistical tool have been well developed since the late 1970’s. In this paper we show how anMDS scheme can be enhanced by incorporating into it a Stochastic Point Location (SPL) strategy (one which optimizes the former’s gradient descent learning phase) and a new Stress function. The enhanced method, referred to as MDS SPL, has been used in conjunction with a combination of the TF-IDF and Cosine Similarities on a very noisy Word-Of-Mouth (WoM) discussion set consisting of postings concerning mobile phones, yielding extremely satisfying results.
An ontology-based retrieval system for mammographic reports
2015
In healthcare domain it can be useful to compare unstructured free-text clinical reports in order to enable the search for similar and/or relevant clinical cases. In data mining and text analysis tasks, the cosine similarity is usually used for texts comparison purposes. It is usually performed by computing the standard document vector cosine similarity between the two vectors representing the report pair under analysis. In this paper a novel system based on text pre-processing techniques and a modelled medical knowledge, using an improved radiological ontology, is proposed. Medical terms organized in a hierarchical tree can assess semantic similarity relationships between unstructured repo…
Adaptive motion estimation and video vector quantization based on spatiotemporal non-linearities of human perception
1997
The two main tasks of a video coding system are motion estimation and vector quantization of the signal. In this work a new splitting criterion to control the adaptive decomposition for the non-uniform optical flow estimation is exposed. Also, a novel bit allocation procedure is proposed for the quantization of the DCT transform of the video signal. These new approaches are founded on a perception model that reproduce the relative importance given by the human visual system to any location in the spatial frequency, temporal frequency and amplitude domain of the DCT transform. The experiments show that the proposed procedures behave better than their equivalent (fixed-block-size motion estim…
On the Design of Fast Wavelet Transform Algorithms With Low Memory Requirements
2008
In this paper, a new algorithm to efficiently compute the two-dimensional wavelet transform is presented. This algorithm aims at low memory consumption and reduced complexity, meeting these requirements by means of line-by-line processing. In this proposal, we use recursion to automatically place the order in which the wavelet transform is computed. This way, we solve some synchronization problems that have not been tackled by previous proposals. Furthermore, unlike other similar proposals, our proposal can be straightforwardly implemented from the algorithm description. To this end, a general algorithm is given which is further detailed to allow its implementation with a simple filter bank…
CCDC 1478714: Experimental Crystal Structure Determination
2016
Related Article: Toni Mäkelä, Anniina Kiesilä, Elina Kalenius and Kari Rissanen|2016|Chem.-Eur.J.|22|14264|doi:10.1002/chem.201602362
CCDC 1850751: Experimental Crystal Structure Determination
2020
Related Article: Eswaran Chinnaraja, Rajendran Arunachalam, Renjith S. Pillai, Anssi Peuronen, Kari Rissanen, Palani S. Subramanian|2020|Appl.Organomet.Chem.|34|e5666|doi:10.1002/aoc.5666
CCDC 1478709: Experimental Crystal Structure Determination
2016
Related Article: Toni Mäkelä, Anniina Kiesilä, Elina Kalenius and Kari Rissanen|2016|Chem.-Eur.J.|22|14264|doi:10.1002/chem.201602362
CCDC 1977518: Experimental Crystal Structure Determination
2021
Related Article: H. Hupatz, M. Gaedke, H. V. Schröder, J. Beerhues, A. Valkonen, F. Klautzsch, S. Müller, F. Witte, K. Rissanen, B. Sarkar and C. A. Schalley|2020|Beilstein J.Org.Chem.|16|2576|doi:10.3762/bjoc.16.209
CCDC 667519: Experimental Crystal Structure Determination
2008
Related Article: D.Meshcheryakov, F.Arnaud-Neu, V.Bohmer, M.Bolte, V.Hubscher-Bruder, E.Jobin, I.Thondorf, S.Werner|2008|Org.Biomol.Chem.|6|1004|doi:10.1039/b718114k
CCDC 667517: Experimental Crystal Structure Determination
2008
Related Article: D.Meshcheryakov, F.Arnaud-Neu, V.Bohmer, M.Bolte, V.Hubscher-Bruder, E.Jobin, I.Thondorf, S.Werner|2008|Org.Biomol.Chem.|6|1004|doi:10.1039/b718114k