The Experts below are selected from a list of 2607 Experts worldwide ranked by ideXlab platform
Christos Diou - One of the best experts on this subject based on the ideXlab platform.
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multi evidence user group discovery in Professional Image search
European Conference on Information Retrieval, 2014Co-Authors: Theodora Tsikrika, Christos DiouAbstract:This work evaluates the combination of multiple evidence for discovering groups of users with similar interests. User groups are created by analysing the search logs recorded for a sample of 149 users of a Professional Image search engine in conjunction with the textual and visual features of the clicked Images, and evaluated by exploiting their topical classification. The results indicate that the discovered user groups are meaningful and that combining textual and visual features improves the homogeneity of the user groups compared to each individual feature.
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ECIR - Multi-evidence User Group Discovery in Professional Image Search
Lecture Notes in Computer Science, 2014Co-Authors: Theodora Tsikrika, Christos DiouAbstract:This work evaluates the combination of multiple evidence for discovering groups of users with similar interests. User groups are created by analysing the search logs recorded for a sample of 149 users of a Professional Image search engine in conjunction with the textual and visual features of the clicked Images, and evaluated by exploiting their topical classification. The results indicate that the discovered user groups are meaningful and that combining textual and visual features improves the homogeneity of the user groups compared to each individual feature.
Theodora Tsikrika - One of the best experts on this subject based on the ideXlab platform.
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multi evidence user group discovery in Professional Image search
European Conference on Information Retrieval, 2014Co-Authors: Theodora Tsikrika, Christos DiouAbstract:This work evaluates the combination of multiple evidence for discovering groups of users with similar interests. User groups are created by analysing the search logs recorded for a sample of 149 users of a Professional Image search engine in conjunction with the textual and visual features of the clicked Images, and evaluated by exploiting their topical classification. The results indicate that the discovered user groups are meaningful and that combining textual and visual features improves the homogeneity of the user groups compared to each individual feature.
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ECIR - Multi-evidence User Group Discovery in Professional Image Search
Lecture Notes in Computer Science, 2014Co-Authors: Theodora Tsikrika, Christos DiouAbstract:This work evaluates the combination of multiple evidence for discovering groups of users with similar interests. User groups are created by analysing the search logs recorded for a sample of 149 users of a Professional Image search engine in conjunction with the textual and visual features of the clicked Images, and evaluated by exploiting their topical classification. The results indicate that the discovered user groups are meaningful and that combining textual and visual features improves the homogeneity of the user groups compared to each individual feature.
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Semantic search log analysis: A method and a study on Professional Image search
Journal of the American Society for Information Science and Technology, 2011Co-Authors: Vera Hollink, Theodora Tsikrika, Arjen P. De VriesAbstract:Existing methods for automatically analyzing search logs describe search behavior on the basis of syntactic differences (overlapping terms) between queries. Although these analyses provide valuable insights into the complexity and successfulness of search interactions, they offer a limited interpretation of the observed searching behavior, as they do not consider the semantics of users' queries. In this article we propose a method to exploit semantic information in the form of linked data to enrich search queries so as to determine the semantic types of the queries and the relations between queries that are consecutively entered in a search session. This work provides also an in-depth analysis of the search logs of Professional users searching a commercial picture portal. Compared to previous Image search log analyses, in particular those of Professional users, we consider a much larger dataset. We analyze the logs both in a syntactic way and using the proposed semantic approach and compare the results. Our findings show the benefits of using semantics for search log analysis: the identified types of query modifications cannot be appropriately analyzed by only considering term overlap, since queries related in the most frequent ways do not usually share terms. © 2011 Wiley Periodicals, Inc.
Guido M. Kamphuis - One of the best experts on this subject based on the ideXlab platform.
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storz Professional Image enhancement system a new technique toimprove endoscopic bladder imaging
Journal of Cancer Science & Therapy, 2016Co-Authors: Guido M. Kamphuis, J Fallert, M H Gultekin, De La Rosette JjmchAbstract:Introduction: SPIES is a novel endoscopic imaging technique with different modalities. Chroma enhances the sharpness of the displayed Image. Clara uses a local brightness adaptation in the Image to achieve a clearer visibility of darker regions within the Image. SPIES Spectra A and B are based on color tone shift algorithms to increase contrast. Objectives: To describe the different SPIES modalities and to test them on bladder tissue Images and tissue simulating phantoms with controlled optical properties. Materials and methods: A bladder tumor Image in both Chroma and Clara is analyzed on contrast related intensity fluctuations compared to the White Light Image. To evaluate Spectra A and B, a validated tissue representing optical phantom model was used. Results: Intensity fluctuations show the effect of the Chroma and Clara mode compared to White light. The SPIES A and B modalities change the effective spectral response in the imaging system. This was shown and measured in the phantom model by an increased absorbance for the superficial layers (Spectra A) and the deeper layers (Spectra B). Conclusion: All SPIES modalities show visual and quantitative differences, expressed as increased Image intensity or pixel-to-pixel intensity difference (Chroma and Clara) or increased contrast (Spectra A and B).
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Comparing Image Perception of Bladder Tumors in Four Different Storz Professional Image Enhancement System Modalities Using the íSPIES App.
Journal of Endourology, 2016Co-Authors: Guido M. Kamphuis, D. Martijn De Bruin, Martin J. Brandt, Thomas Knoll, Pierre Conort, Alberto Lapini, J. Dominguez-escrig, Jean J.m.c.h. De La RosetteAbstract:Abstract Objectives: To evaluate the variation of interpretation of the same bladder urothelium Image in different Storz Professional Image Enhancement System (SPIES) modalities. SPIES contains a White light (WL), Spectra A (SA), Spectra B (SB), and Clara and Chroma combined (CC) modality. Materials and Methods: An App for the iPAD retina was developed to study evaluation of Images. A total of 80 Images from 20 bladder areas acquired in four modalities were included. Seventy-three participants completed the study. Images were analyzed on differences in delineated tumor margin variation, perceived quality of the Image, and delineation time. Results: A separation between high agreement (n = 14) and low agreement (n = 6) Images was found. In high agreement Images, no difference in root mean square (RMS) was found between modalities. In low agreement Images, WL (26.5 pixels) and SA (33.4 pixels) had a higher RMS than CC (18 pixels) and SB (21.4 pixels). The quality of SPIES modalities Images was rated signifi...
Laura Morgan Roberts - One of the best experts on this subject based on the ideXlab platform.
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Changing Faces: Professional Image Construction In Diverse Organizational Settings
Academy of Management Review, 2005Co-Authors: Laura Morgan RobertsAbstract:I integrate social identity and impression management theories to capture the dual impact of personal characteristics and group affiliations on Professional Image construction. In so doing, I describe how and why individuals proactively negotiate their personal and social identities during interpersonal encounters. The model highlights the multilevel impact of credible and authentic Professional Image construction on intrapsychic, interpersonal, workgroup, and organizational outcomes.
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CHANGING FACES: Professional Image CONSTRUCTION IN DIVERSE ORGANIZATIONS.
Academy of Management Proceedings, 2003Co-Authors: Laura Morgan RobertsAbstract:This article asserts that Professional Image construction is the key to establishing a favorable reputation among diverse constituents in the 21st century work force. Professional Image refers to the perceptions from colleagues and clients of another's competence, character and composure. Impression management is a process in which people seek to shape the Image others have of them through their verbal and/or behavioral projection of information about themselves. Social identity-based impression management strategies are aimed toward shaping the manner in which others view individuals in terms of their social identity group memberships. Construction involves deciding what kind of impression to generate, based upon how one wants others to view him or her as a member of his or her social identity group in a given context, and how to present oneself in order to generate the desired impression. Professional identification can influence the motivation of an individual to change the impressions that others have...
Pavel Komínek - One of the best experts on this subject based on the ideXlab platform.
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Comparison of narrow band imaging and the Storz Professional Image Enhancement System for detection of laryngeal and hypopharyngeal pathologies.
European Archives of Oto-Rhino-Laryngology, 2018Co-Authors: Lucia Staníková, R. Walderová, Debora Jančatová, Martin Formánek, Karol Zeleník, Pavel KomínekAbstract:OBJECTIVE The aim of this study was to compare narrow band imaging (NBI) endoscopy and Storz Professional Image Enhancement System (SPIES) in observing epithelial and/or subepithelial microvascular irregularities and pathologies. METHODS A total of 73 patients with laryngeal or hypopharyngeal lesions were investigated using high-definition NBI endoscopy preoperatively in local anesthesia and using SPIES system intraoperatively in general anesthesia from August 2016 to October 2017. Superficial vascular structures were classified preoperatively (NBI) and intraoperatively (SPIES) according to descriptive guidelines of vascular changes by Arens. All lesions were endoscopically evaluated and divided according to the histological examination into four groups (A-benign lesions, B-recurrent respiratory papillomatosis, C-low-grade dysplasia, D-high-grade dysplasia, carcinoma in situ or invasive squamous cell carcinoma), and results were compared with NBI and SPIES optical biopsy. RESULTS Benign lesions (polyps, cysts, chronic inflammation, hyperkeratosis) were histologically confirmed in 26/73 (35.6%) cases and identified by NBI in 20/26 lesions (76.9%) and in 20/26 cases (76.9%) by SPIES, respectively. Recurrent respiratory papillomatosis was confirmed in 16/73 (21.9%) and detected in 15/16 cases (93.8%) by NBI and in 16/16 cases (100.0%) by SPIES. Low-grade dysplasia (mild and moderate dysplasia) was histologically detected in 7/73 patients (9.6%) and accurately identified by NBI in 6/7 (85.7%) and by SPIES in 6/7 (85.7%) cases, respectively. Histopathological features of severe dysplasia, carcinoma in situ or invasive squamous cell carcinoma were detected in 24/73 (32.9%) patients. According to the NBI endoscopy the suspected vascular neoangiogenesis was recognized in 19/24 cases (79.2%) and in 18/24 cases (75.0%) using SPIES endoscopy. Sensitivity and specificity of NBI endoscopy and SPIES system in correct prediction of histological diagnosis of already detected lesions were 83.0 and 98.0% and 86.0 and 96.0%, respectively. Results of NBI/SPIES endoscopy and histopathological features of laryngeal and hypopharyngeal lesions were compared and the level of agreement was 81.43%, kappa index κ = 0.7428 (95% CI 0.682-0.832) (p
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comparison of narrow band imaging and the storz Professional Image enhancement system for detection of laryngeal and hypopharyngeal pathologies
European Archives of Oto-rhino-laryngology, 2018Co-Authors: Lucia Staníková, R. Walderová, Debora Jančatová, Martin Formánek, Karol Zeleník, Pavel KomínekAbstract:OBJECTIVE The aim of this study was to compare narrow band imaging (NBI) endoscopy and Storz Professional Image Enhancement System (SPIES) in observing epithelial and/or subepithelial microvascular irregularities and pathologies. METHODS A total of 73 patients with laryngeal or hypopharyngeal lesions were investigated using high-definition NBI endoscopy preoperatively in local anesthesia and using SPIES system intraoperatively in general anesthesia from August 2016 to October 2017. Superficial vascular structures were classified preoperatively (NBI) and intraoperatively (SPIES) according to descriptive guidelines of vascular changes by Arens. All lesions were endoscopically evaluated and divided according to the histological examination into four groups (A-benign lesions, B-recurrent respiratory papillomatosis, C-low-grade dysplasia, D-high-grade dysplasia, carcinoma in situ or invasive squamous cell carcinoma), and results were compared with NBI and SPIES optical biopsy. RESULTS Benign lesions (polyps, cysts, chronic inflammation, hyperkeratosis) were histologically confirmed in 26/73 (35.6%) cases and identified by NBI in 20/26 lesions (76.9%) and in 20/26 cases (76.9%) by SPIES, respectively. Recurrent respiratory papillomatosis was confirmed in 16/73 (21.9%) and detected in 15/16 cases (93.8%) by NBI and in 16/16 cases (100.0%) by SPIES. Low-grade dysplasia (mild and moderate dysplasia) was histologically detected in 7/73 patients (9.6%) and accurately identified by NBI in 6/7 (85.7%) and by SPIES in 6/7 (85.7%) cases, respectively. Histopathological features of severe dysplasia, carcinoma in situ or invasive squamous cell carcinoma were detected in 24/73 (32.9%) patients. According to the NBI endoscopy the suspected vascular neoangiogenesis was recognized in 19/24 cases (79.2%) and in 18/24 cases (75.0%) using SPIES endoscopy. Sensitivity and specificity of NBI endoscopy and SPIES system in correct prediction of histological diagnosis of already detected lesions were 83.0 and 98.0% and 86.0 and 96.0%, respectively. Results of NBI/SPIES endoscopy and histopathological features of laryngeal and hypopharyngeal lesions were compared and the level of agreement was 81.43%, kappa index κ = 0.7428 (95% CI 0.682-0.832) (p < 0.001) by NBI endoscopy and 81.16%, kappa index κ = 0.7379 (95% CI 0.638-0.880) (p < 0.001) by SPIES endoscopy, respectively. The agreement was confirmed as substantial and strong. Level of agreement of both endoscopic methods was 92.54%, kappa index κ = 0.8965 (95% CI 0.877-0.954) (p < 0.001), agreement was confirmed as almost perfect. Between NBI and SPIES endoscopic imaging methods is no significant differentiation. CONCLUSION Both methods, NBI endoscopy and SPIES system, are comparable in detection and analysis of superficial neoangiogenesis, typical for benign lesion and for precancerous or cancerous changes in larynx and hypopharynx.
