<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0121-750X</journal-id>
<journal-title><![CDATA[Ingeniería]]></journal-title>
<abbrev-journal-title><![CDATA[ing.]]></abbrev-journal-title>
<issn>0121-750X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Distrital Francisco José de Caldas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-750X2017000200211</article-id>
<article-id pub-id-type="doi">10.14483/udistrital.jour.reving.2017.2.a03</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimación Espectral de Series de Tiempo de Absorbancia UV-Vis para el Monitoreo de Calidad de Aguas]]></article-title>
<article-title xml:lang="en"><![CDATA[Spectral Estimation of UV-Vis Absorbance Time Series for Water Quality Monitoring]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Plazas-Nossa]]></surname>
<given-names><![CDATA[Leonardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ávila A.]]></surname>
<given-names><![CDATA[Miguel A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[Andres]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Distrital Francisco José de Caldas  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Pontificia Universidad Javeriana  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>22</volume>
<numero>2</numero>
<fpage>211</fpage>
<lpage>225</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-750X2017000200211&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-750X2017000200211&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-750X2017000200211&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Contexto: Las señales registradas como de series de tiempo por sensores de espectrometría UV-Vis en diferentes instalaciones de saneamiento urbano, pueden ser no estacionarias, lo cual complica el análisis del monitoreo de la calidad del agua. Este trabajo propone realizar la estimación espectral aplicando la transformación de Box-Cox y la diferenciación con el fin de obtener series de tiempo estacionarias en sentido amplio y reducir su dimensionalidad con base en el análisis de componentes principales (PCA, por sus siglas en inglés).  Metodo: La metodología se aplica a series de tiempo de absorbancia UV-Vis para tres sitios de estudio en Colombia: (i) Planta para el tratamiento de agua residual (PTAR) El-Salitre (Bogotá); (ii) Estación de Bombeo Gibraltar (EBG) (Bogotá); y (iii) Planta para el tratamiento de agua residual (PTAR) SanFernando (Itagüí). Las series de tiempo de absorbancia UV-Vis se registran con igual tamaño de 5705 muestras. Se realiza la estimación de la densidad espectral mediante el promedio de eriodogramas modificados con ventana rectangular con un traslape del 50 %, utilizando en el procedimiento DFT (Discrete Fourier Transform) e IFFT (Inverse Fast Fourier Transform) con los veinte armónicos más relevantes.  Resultados: Al reducir la dimensionalidad de las series de tiempo de absorbancia con PCA, se obtienen para cada sitio de estudio seis, ocho y siete componentes principales respectivamente, explicando en conjunto más del 97 % de la variabilidad. Para los tres sitios de estudio, se obtuvieron valores de diferencias inferiores al 30 % para el rango UV, mientras que para el rango visible se obtiene máximas diferencias de: (i) 35 % para El-Salitre; (ii) 61 % para EBG; y (iii) 75 % para San-Fernando.  Conclusiones: Con la transformación de Box-Cox y el proceso de diferenciación aplicado a tres series de tiempo de absorbancia UV-Vis para los sitios propuestos de estudio, se logra reducir la varianza y se elimina la tendencia de las series de tiempo. Se recomienda realizar un pre-procesamiento de las series de tiempo de absorbancia UV-Vis para detectar y remover los valores extremos y posteriormente aplicar el proceso propuesto para la estimación espectral.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Context: Signals recorded as multivariate time series by UV-Vis absorbance captors installed in urban sewer systems, can be non-stationary, yielding complications in the analysis of water quality monitoring. This work proposes to perform spectral estimation using the Box-Cox transformation and differentiation in order to obtain stationary multivariate time series in a wide sense. Additionally, Principal Component Analysis (PCA) is applied to reduce their dimensionality.  Method:  Three different UV-Vis absorbance time series for different Colombian locations were studied: (i) El- Salitre Wastewater Treatment Plant (WWTP) in Bogotá; (ii) Gibraltar Pumping Station (GPS) in Bogotá; and (iii) San-Fernando WWTP in Itagüí. Each UV-Vis absorbance time series had equal sample number (5705). The estimation of the spectral power density is obtained using the average of modified periodograms with rectangular window and an overlap of 50 %, with the 20 most important harmonics from the Discrete Fourier Transform (DFT) and Inverse Fast Fourier Transform (IFFT).  Results:  Absorbance time series dimensionality reduction using PCA, resulted in 6, 8 and 7 principal components for each study site respectively, altogether explaining more than 97 % of their variability. Values of differences below 30 % for the UV range were obtained for the three study sites, while for the visible range the maximum differences obtained were: (i) 35 % for El-Salitre WWTP; (ii) 61 % for GPS; and (iii) 75 % for San-Fernando WWTP.  Conclusions:  The Box-Cox transformation and the differentiation process applied to the UV-Vis absorbance time series for the study sites (El-Salitre, GPS and San-Fernando), allowed to reduce variance and to eliminate tendency of the time series. A pre-processing of UV-Vis absorbance time series is recommended to detect and remove outliers and then apply the proposed process for spectral estimation.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Box-Cox Transformation]]></kwd>
<kwd lng="en"><![CDATA[Periodogram]]></kwd>
<kwd lng="en"><![CDATA[Principal Components Analysis]]></kwd>
<kwd lng="en"><![CDATA[Power spectral density]]></kwd>
<kwd lng="en"><![CDATA[Stationarity]]></kwd>
<kwd lng="en"><![CDATA[UV-Vis sensor]]></kwd>
<kwd lng="en"><![CDATA[Language: Spanish]]></kwd>
<kwd lng="es"><![CDATA[Análisis por componentes principales]]></kwd>
<kwd lng="es"><![CDATA[densidad espectral de potencia]]></kwd>
<kwd lng="es"><![CDATA[estacionariedad]]></kwd>
<kwd lng="es"><![CDATA[periodograma]]></kwd>
<kwd lng="es"><![CDATA[sensor UV-Vis]]></kwd>
<kwd lng="es"><![CDATA[transformación Box-Cox.]]></kwd>
<kwd lng="es"><![CDATA[Idioma: Español]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>[1]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Poch]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Cortés]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Comas]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez-Roda]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez-Marré]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Decisions on urban water systems: some support]]></source>
<year>2012</year>
<edition>First</edition>
<publisher-loc><![CDATA[Spain ]]></publisher-loc>
<publisher-name><![CDATA[University of Girona]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<label>[2]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Garcia]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Barceló]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Comas]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Hadjimichael]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Page]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Acuña]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Placing ecosystem services at the heart of urban water systems management]]></article-title>
<source><![CDATA[Science of the Total Environment]]></source>
<year>2016</year>
<page-range>563-4</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>[3]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Morales-Torres]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Escuder-Bueno]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Andrés-Doménech]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Perales-Momparler]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Decision Support Tool for energy-efficient, sustainable and integrated urban stormwater management]]></article-title>
<source><![CDATA[Environmental Modelling &amp; Software]]></source>
<year>2016</year>
<numero>84</numero>
<issue>84</issue>
<page-range>518-28</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>[4]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Akan]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Houghtalen]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Urban Hydrology, Hydraulics, and Stormwater Quality: Engineering applications and computer modelling]]></source>
<year>2003</year>
<publisher-loc><![CDATA[Hoboken, USA ]]></publisher-loc>
<publisher-name><![CDATA[John Wiley &amp; Sons , Inc.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<label>[5]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dirckx]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[van Daele]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Hellinck]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Groundwater Infiltration Potential (GWIP) as an aid to determining the cause of dilution of waste water]]></article-title>
<source><![CDATA[Journal of Hydrology]]></source>
<year>2016</year>
<numero>542</numero>
<issue>542</issue>
<page-range>474-86</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>[6]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Marsalek]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez-Cisneros]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Malmquist]]></surname>
<given-names><![CDATA[P.-A.]]></given-names>
</name>
<name>
<surname><![CDATA[Karamouz]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Goldenfum]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Chocat]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[Urban wáter cycle processes and interactions]]></source>
<year>2006</year>
<publisher-loc><![CDATA[Paris ]]></publisher-loc>
<publisher-name><![CDATA[Published by the International Hydrological Programme (IHP) of the United Nations Educational, Scientific and Cultural Organization (UNESCO)]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<label>[7]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gosset]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ferro]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Durrieu]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Methods for evaluating the pollution impact of urban wet weather discharges on biocenosis: a review]]></article-title>
<source><![CDATA[Water Research]]></source>
<year>2016</year>
<numero>89</numero>
<issue>89</issue>
<page-range>330-54</page-range></nlm-citation>
</ref>
<ref id="B8">
<label>[8]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Palla]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Gnecco]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hydrologic modelling of Low Impact Development systems at the urban catchment scale]]></article-title>
<source><![CDATA[Journal of Hydrology]]></source>
<year>2015</year>
<numero>528</numero>
<issue>528</issue>
<page-range>361-8</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>[9]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fazi]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Bandla]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Pizzetti]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Swarup]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Microbial biofilms as one of the key elements in modulating ecohydrological processes in both natural and urban water corridors]]></article-title>
<source><![CDATA[Ecohydrology &amp; Hydrobiology]]></source>
<year>2016</year>
<numero>16</numero>
<issue>16</issue>
<page-range>33-8</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>[10]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[von Sperling]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[de Lemos.]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Wastewater]]></surname>
</name>
</person-group>
<source><![CDATA[Characteristics, Treatment and Disposal]]></source>
<year>2007</year>
<edition>First</edition>
<publisher-loc><![CDATA[UK ]]></publisher-loc>
<publisher-name><![CDATA[IWA Publishing]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<label>[11]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Francois]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Gondran]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Nicolas]]></surname>
<given-names><![CDATA[J.-P.]]></given-names>
</name>
<name>
<surname><![CDATA[Parsons]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Environmental assessment of urban mobility: Combing life cycle assessment with land-use and transport interaction modelling-Application to Lyon (France)]]></article-title>
<source><![CDATA[Ecological Indicators]]></source>
<year>2017</year>
<numero>72</numero>
<issue>72</issue>
<page-range>597-604</page-range></nlm-citation>
</ref>
<ref id="B12">
<label>[12]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[van den Broeke]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[On-line and In-situ UV/Vis Spectroscopy: Real time multi parameter measurements with a single instrument]]></source>
<year>2007</year>
<page-range>55-9</page-range><publisher-name><![CDATA[AWE International]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<label>[13]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Bertrand-Krajewski]]></surname>
<given-names><![CDATA[J.-L.]]></given-names>
</name>
<name>
<surname><![CDATA[De Beneditis]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Hochedlinger]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Lettl]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Practical aspects, experiences and strategies by using UVVIS sensors for long-term sewer monitoring]]></article-title>
<source><![CDATA[Water Practice &amp; Technology]]></source>
<year>2006</year>
<page-range>1-8</page-range></nlm-citation>
</ref>
<ref id="B14">
<label>[14]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rieger]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Langergraber]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Thomann]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Fleischmann]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Siegrist]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spectral in-situ analysis of NO 2 , NO 3 , COD, DOC and TSS in the effluent of a WWTP]]></article-title>
<source><![CDATA[Proccedings of AutMoNet]]></source>
<year></year>
<conf-name><![CDATA[ 2nd IWA Conference on Automation in Water Quality Monitoring]]></conf-name>
<conf-date>2004</conf-date>
<conf-loc>Vienna </conf-loc>
<page-range>29-36</page-range></nlm-citation>
</ref>
<ref id="B15">
<label>[15]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Matsumoto]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Desempeño de la Planta de Tratamiento de Aguas Residuales de São João de Iracema (Brasil)]]></article-title>
<source><![CDATA[Revista Ingeniería]]></source>
<year>2016</year>
<volume>21</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>176-86</page-range></nlm-citation>
</ref>
<ref id="B16">
<label>[16]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Salgado]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Pinheiro]]></surname>
<given-names><![CDATA[H. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ferreira]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Saldanha]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Louren]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[In situ UV-Vis spectroscopy to estimate COD and TSS in wastewater drainage sys- tems]]></article-title>
<source><![CDATA[Urban Water Journal]]></source>
<year>2013</year>
<page-range>1-12</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>[17]</label><nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Lepot]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Bertrand-Krajewski]]></surname>
<given-names><![CDATA[J.-L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Local calibration for a UV/Vis spectrometer: PLS vs. SVM. A case study in a WWTP]]></source>
<year></year>
<conf-name><![CDATA[ Proccedings of 7th International Conference on Sewer Processes &amp; Networks]]></conf-name>
<conf-date>20130830</conf-date>
<conf-loc>Sheffield, UK </conf-loc>
</nlm-citation>
</ref>
<ref id="B18">
<label>[18]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lepot]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Hofer]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Caradot]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Aubin]]></surname>
<given-names><![CDATA[J.-B.]]></given-names>
</name>
<name>
<surname><![CDATA[Bertrand-Krajewski]]></surname>
<given-names><![CDATA[J.-L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Calibration of UV/Vis spectrophotometers: A review and comparison of different methods to estimate TSS and total and disolved COD concentrations in sewers, WWTPs and rivers]]></article-title>
<source><![CDATA[Water Research]]></source>
<year>2016</year>
<numero>101</numero>
<issue>101</issue>
<page-range>519-34</page-range></nlm-citation>
</ref>
<ref id="B19">
<label>[19]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fei]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Bai]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Auto-Regressive Models of Non-stationary time series with finite length]]></article-title>
<source><![CDATA[Tsinghua Science and Technology]]></source>
<year>2005</year>
<volume>10</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>162-8</page-range></nlm-citation>
</ref>
<ref id="B20">
<label>[20]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kamarzarrin]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Hosseini]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Mehdi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Kamarzarrin]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Designing and implementing of improved Cryptographic algorithm using modular arithmetic theory]]></article-title>
<source><![CDATA[Journal of Electrical Systems and Information Technology]]></source>
<year>2015</year>
<numero>2</numero>
<issue>2</issue>
<page-range>14-7</page-range></nlm-citation>
</ref>
<ref id="B21">
<label>[21]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Plazas-Nossa]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Avila]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[Andres]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Detection of Outliers and Imputing of Missing Values forWater Quality UV-VIS Absorbance Time Series]]></article-title>
<source><![CDATA[Revista Ingeniería]]></source>
<year>2016</year>
<publisher-name><![CDATA[In press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<label>[22]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Salcedo]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Porto]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Morettin]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Comparing non-stationary and irregularly spaced time series]]></article-title>
<source><![CDATA[Computational Statistics and Data Analysis]]></source>
<year>2012</year>
<numero>56</numero>
<issue>56</issue>
<page-range>3921-34</page-range></nlm-citation>
</ref>
<ref id="B23">
<label>[23]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Huang]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kobayashi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[McAleer]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Testing for the Box-Cox parameter for an integrated process]]></article-title>
<source><![CDATA[Mathematics and Computers in Simulation]]></source>
<year>2012</year>
<numero>83</numero>
<issue>83</issue>
<page-range>1-9</page-range></nlm-citation>
</ref>
<ref id="B24">
<label>[24]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bicego]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Baldo]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Properties of the Box-Cox transformation for pattern classification]]></article-title>
<source><![CDATA[Neurocomputing]]></source>
<year>2016</year>
<numero>218</numero>
<issue>218</issue>
<page-range>390-400</page-range></nlm-citation>
</ref>
<ref id="B25">
<label>[25]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tsiotas]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[On the use of the Box-Cox transformation on conditional variance models]]></article-title>
<source><![CDATA[Finance Research Letters]]></source>
<year>2007</year>
<numero>4</numero>
<issue>4</issue>
<page-range>28-32</page-range></nlm-citation>
</ref>
<ref id="B26">
<label>[26]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Proietti]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Lütkepohl]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Does the Box-Cox transformation help in forecasting macroeconomic time series?]]></article-title>
<source><![CDATA[International Journal of Forecasting]]></source>
<year>2013</year>
<numero>29</numero>
<issue>29</issue>
<page-range>88-99</page-range></nlm-citation>
</ref>
<ref id="B27">
<label>[27]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Langergraber]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Fleischmann]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Hofstaedter]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Weingartner]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Monitoring of a paper mill wastewater treatment plant using UV/VIS spectroscopy]]></article-title>
<source><![CDATA[IWA Water Science and Technology]]></source>
<year>2004</year>
<volume>49</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>9-14</page-range></nlm-citation>
</ref>
<ref id="B28">
<label>[28]</label><nlm-citation citation-type="book">
<collab>s::can</collab>
<source><![CDATA[Manual ana::pro Version 5.3 September 2006 Release]]></source>
<year>2006</year>
<publisher-loc><![CDATA[Vienna, Austria ]]></publisher-loc>
<publisher-name><![CDATA[Messtechnik GmbH]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B29">
<label>[29]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zamora]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Métodos Machine Learning aplicados para estimar la concentración de los contaminantes de la DQO y de los SST en hidrosistemas de saneamiento urbano a partir de espectrometría UV-Visible]]></source>
<year>2013</year>
<publisher-loc><![CDATA[Bogotá, Colombia ]]></publisher-loc>
<publisher-name><![CDATA[Pontificia Universidad Javeriana]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B30">
<label>[30]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Winkler]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Saracevic]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Bertrand-Krajewski]]></surname>
<given-names><![CDATA[J.-L.]]></given-names>
</name>
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Benefits, limitations and uncertainty of in situ spectrometry]]></article-title>
<source><![CDATA[Water science and technology]]></source>
<year>2008</year>
<volume>57</volume>
<numero>10</numero>
<issue>10</issue>
<page-range>1651-8</page-range></nlm-citation>
</ref>
<ref id="B31">
<label>[31]</label><nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harjula]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Hekkala]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Matinmikko]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Mustonen]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Performance Evaluation of Spectrum Sensing Using Welch Periodogram for OFDM Signals]]></source>
<year></year>
<conf-name><![CDATA[ 73rd Vehicular Technology Conference (VTC Spring)]]></conf-name>
<conf-date>2011</conf-date>
<conf-loc> </conf-loc>
<page-range>1-5</page-range><publisher-name><![CDATA[IEEE]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B32">
<label>[32]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Adaptive spectral estimation for nonstationary multivariate time series]]></article-title>
<source><![CDATA[Computational Statistics and Data Analysis]]></source>
<year>2016</year>
<numero>103</numero>
<issue>103</issue>
<page-range>330-49</page-range></nlm-citation>
</ref>
<ref id="B33">
<label>[33]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chong]]></surname>
<given-names><![CDATA[T.-L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estimating the differencing parameter via the partial autocorrelation function]]></article-title>
<source><![CDATA[Journal of Econometrics]]></source>
<year>2000</year>
<numero>97</numero>
<issue>97</issue>
<page-range>365-81</page-range></nlm-citation>
</ref>
<ref id="B34">
<label>[34]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hassler]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Persistence under temporal aggregation and differencing]]></article-title>
<source><![CDATA[Economics Letters]]></source>
<year>2014</year>
<numero>124</numero>
<issue>124</issue>
<page-range>318-22</page-range></nlm-citation>
</ref>
<ref id="B35">
<label>[35]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shen]]></surname>
<given-names><![CDATA[Ch.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A comparison of principal components using TPCA and nonstationary principal component analysis on daily air -pollutant concentration series]]></article-title>
<source><![CDATA[Physica A,]]></source>
<year>2017</year>
<numero>467</numero>
<issue>467</issue>
<page-range>453-64</page-range></nlm-citation>
</ref>
<ref id="B36">
<label>[36]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stavropoulos]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Fassois]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Non-stationary functional series modeling and analysis of hardware reliability series: a comparative study using rail vehicle interfailure times]]></article-title>
<source><![CDATA[Reliability Engineering and System Safety]]></source>
<year>2000</year>
<numero>68</numero>
<issue>68</issue>
<page-range>169-83</page-range></nlm-citation>
</ref>
<ref id="B37">
<label>[37]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shlens]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[A Tutorial on Principal Component Analysis]]></source>
<year>2009</year>
<page-range>1-13</page-range><publisher-loc><![CDATA[La Jolla, California, USA ]]></publisher-loc>
<publisher-name><![CDATA[Salk Institute for Biological Studies]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B38">
<label>[38]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barbour]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Parker]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[psd: Adaptive,sine multitaper power spectral density estimation for R]]></article-title>
<source><![CDATA[Computers and Geosciences]]></source>
<year>2014</year>
<numero>63</numero>
<issue>63</issue>
<page-range>1-8</page-range></nlm-citation>
</ref>
<ref id="B39">
<label>[39]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bogdan]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Istrate]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The analysis of the principal components of the financial reporting in the case of Romanian list ed companies]]></article-title>
<source><![CDATA[Procedia Economics and Finance]]></source>
<year>2015</year>
<numero>20</numero>
<issue>20</issue>
<page-range>553-61</page-range></nlm-citation>
</ref>
<ref id="B40">
<label>[40]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Plazas-Nossa]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Ávila]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Moncada]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estimación del Exponente de Hurst y Dimensión Fractal para el análisis de series de tiempo de Absorbancia UV-VIS]]></article-title>
<source><![CDATA[Ciencia e Ingeniería Neogranadina]]></source>
<year>2014</year>
<volume>42</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>133-43</page-range></nlm-citation>
</ref>
<ref id="B41">
<label>[41]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Baldick]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Future Wind Power Scenario Synthesis Through Power Spectral Density Analysis]]></article-title>
<source><![CDATA[IEEE Transactions on Smart Grid]]></source>
<year>2014</year>
<volume>5</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>490-500</page-range></nlm-citation>
</ref>
<ref id="B42">
<label>[42]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bach]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Jordan]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Learning Graphical Models for Stationary Time Series]]></article-title>
<source><![CDATA[IEEE Transactions on Signal Processing]]></source>
<year>2004</year>
<volume>52</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>2189-99</page-range></nlm-citation>
</ref>
<ref id="B43">
<label>[43]</label><nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lv]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Yue]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Short-Term Wind Speed Forecasting Based on Non-stationary Time Series analysis and ARCH model]]></source>
<year></year>
<conf-name><![CDATA[ Proccedings of International Conference on Multimedia Technology (ICMT)]]></conf-name>
<conf-date>2011</conf-date>
<conf-loc>Hangzhou, China </conf-loc>
<page-range>2549-53</page-range></nlm-citation>
</ref>
<ref id="B44">
<label>[44]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Proakis]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Manolakis]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Digital signal processing principles, algorithms, and applications]]></source>
<year>2007</year>
<edition>Fourth</edition>
<publisher-loc><![CDATA[New Jersey, USA ]]></publisher-loc>
<publisher-name><![CDATA[Pearson Prentice Hall]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B45">
<label>[45]</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tuffner]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Pierre]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kubichek]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Computationally Efficient Updating of a Weighted Welch Periodogram for Nonstationary Signals]]></source>
<year>2008</year>
<page-range>799-802</page-range></nlm-citation>
</ref>
<ref id="B46">
<label>[46]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Diebold]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Elements of Forecasting]]></source>
<year>2001</year>
<edition>Second</edition>
<publisher-name><![CDATA[Thomson/South Western Publishing an ITP Company]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B47">
<label>[47]</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gujarati]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Porter]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Basic Econometrics]]></source>
<year>2008</year>
<edition>5</edition>
<publisher-loc><![CDATA[Irwin. New York-USA ]]></publisher-loc>
<publisher-name><![CDATA[McGraw-Hill Higer Education]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
