Fernando Correa-Tome - Academia.edu (original) (raw)
Papers by Fernando Correa-Tome
Cheminform, 2010
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tetrahedron Letters, Oct 30, 1995
... Manuel Medarde * , Jose Luis López * , Ma Angeles Morillo, Fernando Tomé, Marta Adeva and Art... more ... Manuel Medarde * , Jose Luis López * , Ma Angeles Morillo, Fernando Tomé, Marta Adeva and Arturo San Feliciano. Departamento de Química Orgánica y Farmacéutica. Facultad de Farmacia. ... 4142. Full Text via CrossRef b) CP Jaspere, DP Curran and TL Fevig, Chem. Rev. ...
ChemInform, 1997
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2000
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tetrahedron Letters, 1996
An easy and useful method for the preparation of simple 1-phenoxy-2trialkylsiloxy-l,3-dienes in h... more An easy and useful method for the preparation of simple 1-phenoxy-2trialkylsiloxy-l,3-dienes in high yields, has been established and their reactivity in the Diels-Alder reaction at room temperature has been studied. By this procedure, phenoxy substituted cyclohexenes and cyclohexanones of known relative stereochemistry can be obtained.
Journal of Electronic Imaging, 2015
The segmentation of images is a critical step in many computer vision applications. Additionally,... more The segmentation of images is a critical step in many computer vision applications. Additionally, some applications require the achievement of acceptable segmentation quality while the algorithm is executed in real time. In this study, we present a split-and-merge segmentation methodology that uses integral images to improve the execution time. We call our methodology integral split and merge (ISM) segmentation. The integral images are used here to calculate statistics of the image regions in constant time. Those statistics are used to guide the splitting process by identifying the homogeneous regions in the image. We also propose a merge criterion that performs connected component analysis of the homogeneous regions. Moreover, the merging procedure is able to group regions of the image showing gradients. Furthermore, the number of regions resulting from the segmentation process is determined automatically. In a series of tests, we compare ISM against other state-of-theart algorithms. The results from the tests show that our ISM methodology obtains image segmentations with a comparable quality, using a simple texture descriptor instead of a combination of color-texture descriptors. The proposed ISM methodology also has a piecewise linear computational complexity, resulting in an algorithm fast enough to be executed in real time. Integral split-and-merge methodology. . .
Journal of Real-Time Image Processing, 2013
ABSTRACT In this study, a visual similarity metric based on precision–recall graphs is presented ... more ABSTRACT In this study, a visual similarity metric based on precision–recall graphs is presented as an alternative to the widely used Hausdorff distance (HD). Such metric, called maximum cardinality similarity metric, is computed between a reference shape and a test template, each one represented by a set of edge points. We address this problem using a bipartite graph representation of the relationship between the sets. The matching problem is solved using the Hopcroft–Karp algorithm, taking advantage of its low computational complexity. We present a comparison between our results and those obtained from applying the partial Hausdorff distance (PHD) to the same test sets. Similar results were found using both approaches for standard template-matching applications. Nevertheless, the proposed methodology is more accurate at determining the completeness of partial shapes under noise conditions. Furthermore, the processing time required by our methodology is lower than that required to compute the PHD, for a large set of points.
ChemInform, 2002
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2000
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
2009 International Conference on Electrical, Communications, and Computers, 2009
Abstract In this work, we have tested a color based segmentation approach that uses the CIELab co... more Abstract In this work, we have tested a color based segmentation approach that uses the CIELab color space. We use a color reduction approach where the dominant color database is obtained from the analysis of the entire Berkeley natural image database. After experiments using single color components and all their possible combinations as the segmentation basis, we have found that ab is the best color component combination for the segmentation task. F measures and Precision Recall graphs are used as the evidence for ...
ChemInform, 1999
Hydroindenic-Guanylhydrazones. Synthesis and Evaluation as Inotropic Agents.
ChemInform, 2008
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tetrahedron: Asymmetry, 1997
The asymmetric synthesis of the building block 3a-hydroxy-4,7adimethylperhydroindane-l,5-dione 3,... more The asymmetric synthesis of the building block 3a-hydroxy-4,7adimethylperhydroindane-l,5-dione 3, has been achieved from the triketone 4. The use of additional amounts of base and heating increases the rate of the cyclization reaction catalyzed by S-(-)-proline, which is completed in less than 2 days. @ 1997
Tetrahedron Letters, 1997
The synthesis of 1-(3,4,5-trimethoxyphenyl)-3-trialkylsiloxy-l,3butadienes and their Diels-Alder ... more The synthesis of 1-(3,4,5-trimethoxyphenyl)-3-trialkylsiloxy-l,3butadienes and their Diels-Alder reaction with selected dienophiles at room temperature is described. These aryldienes are useful building blocks for the synthesis of natural and pharmacological active products, as has been shown by the preparation of a tetracyclic ketone needed for the synthesis of new anthracycline analogues.
Tetrahedron Letters, 1993
aa oxy group at po&ioa 3 and a syndispaaJ cis-fud ring at pooitia~ 4 ad 5. dcqo rcgio-and s~aelcc... more aa oxy group at po&ioa 3 and a syndispaaJ cis-fud ring at pooitia~ 4 ad 5. dcqo rcgio-and s~aelcctive acetaxylatiaus (at podion 6) in tbc pmcc of lead(W) acetate.
Tetrahedron Letters, 2004
New 1-phthalimido-4-(3-indolyl)-2-trialkylsiloxy-1,3-butadienes were easily prepared from 1,3-dic... more New 1-phthalimido-4-(3-indolyl)-2-trialkylsiloxy-1,3-butadienes were easily prepared from 1,3-dichloropropanone and their configurations were established from NMR data. Their Diels-Alder reactivity with different maleimides and quinones was studied, high yields of the exo cycloadducts being obtained, as confirmed by X-ray diffraction studies.
Tetrahedron, 2002
A novel chemical construction of B, B-dinor-B-secosteroids as simplified cardenolide analogs, sta... more A novel chemical construction of B, B-dinor-B-secosteroids as simplified cardenolide analogs, starting from the Hajos–Parrish diketone was developed. The synthesis of the equivalent of the steroid A ring was carried out through a Diels–Alder reaction between an ...
Cheminform, 2010
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tetrahedron Letters, Oct 30, 1995
... Manuel Medarde * , Jose Luis López * , Ma Angeles Morillo, Fernando Tomé, Marta Adeva and Art... more ... Manuel Medarde * , Jose Luis López * , Ma Angeles Morillo, Fernando Tomé, Marta Adeva and Arturo San Feliciano. Departamento de Química Orgánica y Farmacéutica. Facultad de Farmacia. ... 4142. Full Text via CrossRef b) CP Jaspere, DP Curran and TL Fevig, Chem. Rev. ...
ChemInform, 1997
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2000
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tetrahedron Letters, 1996
An easy and useful method for the preparation of simple 1-phenoxy-2trialkylsiloxy-l,3-dienes in h... more An easy and useful method for the preparation of simple 1-phenoxy-2trialkylsiloxy-l,3-dienes in high yields, has been established and their reactivity in the Diels-Alder reaction at room temperature has been studied. By this procedure, phenoxy substituted cyclohexenes and cyclohexanones of known relative stereochemistry can be obtained.
Journal of Electronic Imaging, 2015
The segmentation of images is a critical step in many computer vision applications. Additionally,... more The segmentation of images is a critical step in many computer vision applications. Additionally, some applications require the achievement of acceptable segmentation quality while the algorithm is executed in real time. In this study, we present a split-and-merge segmentation methodology that uses integral images to improve the execution time. We call our methodology integral split and merge (ISM) segmentation. The integral images are used here to calculate statistics of the image regions in constant time. Those statistics are used to guide the splitting process by identifying the homogeneous regions in the image. We also propose a merge criterion that performs connected component analysis of the homogeneous regions. Moreover, the merging procedure is able to group regions of the image showing gradients. Furthermore, the number of regions resulting from the segmentation process is determined automatically. In a series of tests, we compare ISM against other state-of-theart algorithms. The results from the tests show that our ISM methodology obtains image segmentations with a comparable quality, using a simple texture descriptor instead of a combination of color-texture descriptors. The proposed ISM methodology also has a piecewise linear computational complexity, resulting in an algorithm fast enough to be executed in real time. Integral split-and-merge methodology. . .
Journal of Real-Time Image Processing, 2013
ABSTRACT In this study, a visual similarity metric based on precision–recall graphs is presented ... more ABSTRACT In this study, a visual similarity metric based on precision–recall graphs is presented as an alternative to the widely used Hausdorff distance (HD). Such metric, called maximum cardinality similarity metric, is computed between a reference shape and a test template, each one represented by a set of edge points. We address this problem using a bipartite graph representation of the relationship between the sets. The matching problem is solved using the Hopcroft–Karp algorithm, taking advantage of its low computational complexity. We present a comparison between our results and those obtained from applying the partial Hausdorff distance (PHD) to the same test sets. Similar results were found using both approaches for standard template-matching applications. Nevertheless, the proposed methodology is more accurate at determining the completeness of partial shapes under noise conditions. Furthermore, the processing time required by our methodology is lower than that required to compute the PHD, for a large set of points.
ChemInform, 2002
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform, 2000
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
2009 International Conference on Electrical, Communications, and Computers, 2009
Abstract In this work, we have tested a color based segmentation approach that uses the CIELab co... more Abstract In this work, we have tested a color based segmentation approach that uses the CIELab color space. We use a color reduction approach where the dominant color database is obtained from the analysis of the entire Berkeley natural image database. After experiments using single color components and all their possible combinations as the segmentation basis, we have found that ab is the best color component combination for the segmentation task. F measures and Precision Recall graphs are used as the evidence for ...
ChemInform, 1999
Hydroindenic-Guanylhydrazones. Synthesis and Evaluation as Inotropic Agents.
ChemInform, 2008
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Tetrahedron: Asymmetry, 1997
The asymmetric synthesis of the building block 3a-hydroxy-4,7adimethylperhydroindane-l,5-dione 3,... more The asymmetric synthesis of the building block 3a-hydroxy-4,7adimethylperhydroindane-l,5-dione 3, has been achieved from the triketone 4. The use of additional amounts of base and heating increases the rate of the cyclization reaction catalyzed by S-(-)-proline, which is completed in less than 2 days. @ 1997
Tetrahedron Letters, 1997
The synthesis of 1-(3,4,5-trimethoxyphenyl)-3-trialkylsiloxy-l,3butadienes and their Diels-Alder ... more The synthesis of 1-(3,4,5-trimethoxyphenyl)-3-trialkylsiloxy-l,3butadienes and their Diels-Alder reaction with selected dienophiles at room temperature is described. These aryldienes are useful building blocks for the synthesis of natural and pharmacological active products, as has been shown by the preparation of a tetracyclic ketone needed for the synthesis of new anthracycline analogues.
Tetrahedron Letters, 1993
aa oxy group at po&ioa 3 and a syndispaaJ cis-fud ring at pooitia~ 4 ad 5. dcqo rcgio-and s~aelcc... more aa oxy group at po&ioa 3 and a syndispaaJ cis-fud ring at pooitia~ 4 ad 5. dcqo rcgio-and s~aelcctive acetaxylatiaus (at podion 6) in tbc pmcc of lead(W) acetate.
Tetrahedron Letters, 2004
New 1-phthalimido-4-(3-indolyl)-2-trialkylsiloxy-1,3-butadienes were easily prepared from 1,3-dic... more New 1-phthalimido-4-(3-indolyl)-2-trialkylsiloxy-1,3-butadienes were easily prepared from 1,3-dichloropropanone and their configurations were established from NMR data. Their Diels-Alder reactivity with different maleimides and quinones was studied, high yields of the exo cycloadducts being obtained, as confirmed by X-ray diffraction studies.
Tetrahedron, 2002
A novel chemical construction of B, B-dinor-B-secosteroids as simplified cardenolide analogs, sta... more A novel chemical construction of B, B-dinor-B-secosteroids as simplified cardenolide analogs, starting from the Hajos–Parrish diketone was developed. The synthesis of the equivalent of the steroid A ring was carried out through a Diels–Alder reaction between an ...