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Ibrahim Karaman

dblp:239/4182 · DBLP profile ↗
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1ranked-venue papers
0as first author
0since 2021 · last 2020
0000-0001-9341-8155ORCID · reported

Domains — the database's venue-derived domains; a paper can count in several

Applied, interdisciplinary, general and emerging computing · 1

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Interdisciplinary, comprehensive, and emerging computing
1 paper
Bioinformatics and computational biology · 100%

Topics — the 4 heaviest of 4, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Bioinformatics and computational biology › metabolomics
LC-MS data analysis
0.412020
Targeted realignment of LC-MS profiles by neighbor-wise compound-specific graphical time warping with misalignment detection · Bioinform. 2020
Bioinformatics and computational biology
metabolomics
0.412020
Targeted realignment of LC-MS profiles by neighbor-wise compound-specific graphical time warping with misalignment detection · Bioinform. 2020
Bioinformatics and computational biology
proteomics
0.412020
Targeted realignment of LC-MS profiles by neighbor-wise compound-specific graphical time warping with misalignment detection · Bioinform. 2020
Bioinformatics and computational biology › metabolomics
retention time alignment
0.412020
Targeted realignment of LC-MS profiles by neighbor-wise compound-specific graphical time warping with misalignment detection · Bioinform. 2020

Methods — techniques the papers use, named apart from their topics

graphical time warping · 0.4dynamic time warping · 0.4
YearPublicationVenuePosition
2020 Targeted realignment of LC-MS profiles by neighbor-wise compound-specific graphical time warping with misalignment detection
abstract
MOTIVATION: Liquid chromatography-mass spectrometry (LC-MS) is a standard method for proteomics and metabolomics analysis of biological samples. Unfortunately, it suffers from various changes in the retention times (RT) of the same compound in different samples, and these must be subsequently corrected (aligned) during data processing. Classic alignment methods such as in the popular XCMS package often assume a single time-warping function for each sample. Thus, the potentially varying RT drift for compounds with different masses in a sample is neglected in these methods. Moreover, the systematic change in RT drift across run order is often not considered by alignment algorithms. Therefore, these methods cannot effectively correct all misalignments. For a large-scale experiment involving many samples, the existence of misalignment becomes inevitable and concerning. RESULTS: Here, we describe an integrated reference-free profile alignment method, neighbor-wise compound-specific Graphical Time Warping (ncGTW), that can detect misaligned features and align profiles by leveraging expected RT drift structures and compound-specific warping functions. Specifically, ncGTW uses individualized warping functions for different compounds and assigns constraint edges on warping functions of neighboring samples. Validated with both realistic synthetic data and internal quality control samples, ncGTW applied to two large-scale metabolomics LC-MS datasets identifies many misaligned features and successfully realigns them. These features would otherwise be discarded or uncorrected using existing methods. The ncGTW software tool is developed currently as a plug-in to detect and realign misaligned features present in standard XCMS output. AVAILABILITY AND IMPLEMENTATION: An R package of ncGTW is freely available at Bioconductor and https://github.com/ChiungTingWu/ncGTW. A detailed user's manual and a vignette are provided within the package. SUPPLEMENTARY INFORMATION: Supplementary data are available at Bioinformatics online.
Chiung-Ting Wu, Yizhi Wang 0009, Yinxue Wang, Timothy M. D. Ebbels, Ibrahim Karaman, Gonçalo Graça, David M. Herrington, Yue Joseph Wang, Guoqiang Yu
Bioinform.5