This work evaluated the capability of the Hilbert Transform to generate reliable cardiotacograms ... more This work evaluated the capability of the Hilbert Transform to generate reliable cardiotacograms from fetal phonocardiography
The refractive index (n) of a liquid is commonly measured in the chemistry laboratory using a ref... more The refractive index (n) of a liquid is commonly measured in the chemistry laboratory using a refracrometer at a single wavelength (589 nm) and temperature (20 degrees C). The refractive index of a solid material is sometimes estimated by index matching to known liquids; when a solid ''disappears'' in a liquid medium, it is assumed to have the same index
The refractive index (n) of a liquid is commonly measured in the chemistry laboratory using a ref... more The refractive index (n) of a liquid is commonly measured in the chemistry laboratory using a refracrometer at a single wavelength (589 nm) and temperature (20 degrees C). The refractive index of a solid material is sometimes estimated by index matching to known liquids; when a solid ''disappears'' in a liquid medium, it is assumed to have the same index
In this laboratory exercise, the dispersion curve of CaF2 (i.e., refractive index as a function o... more In this laboratory exercise, the dispersion curve of CaF2 (i.e., refractive index as a function of wavelength) was determined by temperature-dependent UV-vis spectroscopy of solid CaF2 powder intercalated by liquid hexadecane. The relative error between the literature and the experimental values for the index of refraction of CaF2 was about 1‰ at most visible wavelengths. This exercise introduces students to a novel spectroscopic method for refractive index measurement and illustrates the variation in refractive index of a typical solid over the visible wavelength region.
In this laboratory exercise, the dispersion curve of CaF2 (i.e., refractive index as a function o... more In this laboratory exercise, the dispersion curve of CaF2 (i.e., refractive index as a function of wavelength) was determined by temperature-dependent UV-vis spectroscopy of solid CaF2 powder intercalated by liquid hexadecane. The relative error between the literature and the experimental values for the index of refraction of CaF2 was about 1‰ at most visible wavelengths. This exercise introduces students to a novel spectroscopic method for refractive index measurement and illustrates the variation in refractive index of a typical solid over the visible wavelength region.
The discovery of frequent musical patterns (motifs) is a relevant problem in musicology. This pap... more The discovery of frequent musical patterns (motifs) is a relevant problem in musicology. This paper introduces an unsupervised algorithm to address this problem in symbolically-represented musical melodies. Our algorithm is able to identify transposed patterns including exact matchings, i.e., null transpositions. We have tested our algorithm on a corpus of songs and the results suggest that our approach is promising, specially when dealing with songs that include non-exact repetitions.
Automatic extraction of frequent repeated patterns in music material is an interesting problem. T... more Automatic extraction of frequent repeated patterns in music material is an interesting problem. This paper presents an effective approach of unsupervised frequent pattern discovery method from symbolic music sources. Patterns are discovered even if they are transposed. Experiments on some songs suggest that our approach is promising, specially when dealing with songs that include non-exact repetitions.
This paper proposes a new approach to mine multirelational databases. Our approach is based on th... more This paper proposes a new approach to mine multirelational databases. Our approach is based on the representation of multirelational databases as sets of trees, for which we propose two alternative representation schemes. Tree mining techniques can thus be applied as the basis for multirelational data mining techniques, such as multirelational classification or multirelational clustering. We analyze the differences between identifying induced and embedded tree patterns in the proposed tree-based representation schemes and we study the relationships among the sets of tree patterns that can be discovered in each case. This paper also describes how these frequent tree patterns can be used, for instance, to mine association rules in multirelational databases.
Non-linear data structures are becoming more and more common in data mining problems. Trees, in p... more Non-linear data structures are becoming more and more common in data mining problems. Trees, in particular, are amenable to efficient mining techniques. In this paper, we introduce a scalable and parallelizable algorithm to mine partially-ordered trees. Our algorithm, POTMiner, is able to identify both induced and embedded subtrees in such trees. As special cases, it can also handle both completely ordered and completely unordered trees.
Many data mining problems can be represented with non-linear data structures like trees. In this ... more Many data mining problems can be represented with non-linear data structures like trees. In this paper, we introduce a scalable algorithm to mine partially-ordered trees. Our algorithm, POTMiner, is able to identify both induced and embedded subtrees and, as special cases, it can handle both completely ordered and completely unordered trees (i.e. the particular situations existing algorithms address).
This work evaluated the capability of the Hilbert Transform to generate reliable cardiotacograms ... more This work evaluated the capability of the Hilbert Transform to generate reliable cardiotacograms from fetal phonocardiography
The refractive index (n) of a liquid is commonly measured in the chemistry laboratory using a ref... more The refractive index (n) of a liquid is commonly measured in the chemistry laboratory using a refracrometer at a single wavelength (589 nm) and temperature (20 degrees C). The refractive index of a solid material is sometimes estimated by index matching to known liquids; when a solid ''disappears'' in a liquid medium, it is assumed to have the same index
The refractive index (n) of a liquid is commonly measured in the chemistry laboratory using a ref... more The refractive index (n) of a liquid is commonly measured in the chemistry laboratory using a refracrometer at a single wavelength (589 nm) and temperature (20 degrees C). The refractive index of a solid material is sometimes estimated by index matching to known liquids; when a solid ''disappears'' in a liquid medium, it is assumed to have the same index
In this laboratory exercise, the dispersion curve of CaF2 (i.e., refractive index as a function o... more In this laboratory exercise, the dispersion curve of CaF2 (i.e., refractive index as a function of wavelength) was determined by temperature-dependent UV-vis spectroscopy of solid CaF2 powder intercalated by liquid hexadecane. The relative error between the literature and the experimental values for the index of refraction of CaF2 was about 1‰ at most visible wavelengths. This exercise introduces students to a novel spectroscopic method for refractive index measurement and illustrates the variation in refractive index of a typical solid over the visible wavelength region.
In this laboratory exercise, the dispersion curve of CaF2 (i.e., refractive index as a function o... more In this laboratory exercise, the dispersion curve of CaF2 (i.e., refractive index as a function of wavelength) was determined by temperature-dependent UV-vis spectroscopy of solid CaF2 powder intercalated by liquid hexadecane. The relative error between the literature and the experimental values for the index of refraction of CaF2 was about 1‰ at most visible wavelengths. This exercise introduces students to a novel spectroscopic method for refractive index measurement and illustrates the variation in refractive index of a typical solid over the visible wavelength region.
The discovery of frequent musical patterns (motifs) is a relevant problem in musicology. This pap... more The discovery of frequent musical patterns (motifs) is a relevant problem in musicology. This paper introduces an unsupervised algorithm to address this problem in symbolically-represented musical melodies. Our algorithm is able to identify transposed patterns including exact matchings, i.e., null transpositions. We have tested our algorithm on a corpus of songs and the results suggest that our approach is promising, specially when dealing with songs that include non-exact repetitions.
Automatic extraction of frequent repeated patterns in music material is an interesting problem. T... more Automatic extraction of frequent repeated patterns in music material is an interesting problem. This paper presents an effective approach of unsupervised frequent pattern discovery method from symbolic music sources. Patterns are discovered even if they are transposed. Experiments on some songs suggest that our approach is promising, specially when dealing with songs that include non-exact repetitions.
This paper proposes a new approach to mine multirelational databases. Our approach is based on th... more This paper proposes a new approach to mine multirelational databases. Our approach is based on the representation of multirelational databases as sets of trees, for which we propose two alternative representation schemes. Tree mining techniques can thus be applied as the basis for multirelational data mining techniques, such as multirelational classification or multirelational clustering. We analyze the differences between identifying induced and embedded tree patterns in the proposed tree-based representation schemes and we study the relationships among the sets of tree patterns that can be discovered in each case. This paper also describes how these frequent tree patterns can be used, for instance, to mine association rules in multirelational databases.
Non-linear data structures are becoming more and more common in data mining problems. Trees, in p... more Non-linear data structures are becoming more and more common in data mining problems. Trees, in particular, are amenable to efficient mining techniques. In this paper, we introduce a scalable and parallelizable algorithm to mine partially-ordered trees. Our algorithm, POTMiner, is able to identify both induced and embedded subtrees in such trees. As special cases, it can also handle both completely ordered and completely unordered trees.
Many data mining problems can be represented with non-linear data structures like trees. In this ... more Many data mining problems can be represented with non-linear data structures like trees. In this paper, we introduce a scalable algorithm to mine partially-ordered trees. Our algorithm, POTMiner, is able to identify both induced and embedded subtrees and, as special cases, it can handle both completely ordered and completely unordered trees (i.e. the particular situations existing algorithms address).
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