Perceived features and similarity of images: An investigation into their relationships and a test of Tversky's contrast model.

Perceived features and similarity of images: An investigation into their relationships and a test of Tversky's contrast model.

Date: May 2005
Creator: Rorissa, Abebe
Description: The creation, storage, manipulation, and transmission of images have become less costly and more efficient. Consequently, the numbers of images and their users are growing rapidly. This poses challenges to those who organize and provide access to them. One of these challenges is similarity matching. Most current content-based image retrieval (CBIR) systems which can extract only low-level visual features such as color, shape, and texture, use similarity measures based on geometric models of similarity. However, most human similarity judgment data violate the metric axioms of these models. Tversky's (1977) contrast model, which defines similarity as a feature contrast task and equates the degree of similarity of two stimuli to a linear combination of their common and distinctive features, explains human similarity judgments much better than the geometric models. This study tested the contrast model as a conceptual framework to investigate the nature of the relationships between features and similarity of images as perceived by human judges. Data were collected from 150 participants who performed two tasks: an image description and a similarity judgment task. Qualitative methods (content analysis) and quantitative (correlational) methods were used to seek answers to four research questions related to the relationships between common and distinctive features ...
Contributing Partner: UNT Libraries
Empowering Digital Libraries Users through Combining Taxonomies with Folksonomies

Empowering Digital Libraries Users through Combining Taxonomies with Folksonomies

Date: October 2012
Creator: Alemneh, Daniel Gelaw & Rorissa, Abebe
Description: This paper accompanies a poster presentation discussing empowering digital libraries users through combining taxonomies and folksonomies.
Contributing Partner: UNT Libraries
Empowering Digital Libraries Users through Combining Taxonomies with Folksonomies

Empowering Digital Libraries Users through Combining Taxonomies with Folksonomies

Date: October 2012
Creator: Alemneh, Daniel Gelaw & Rorissa, Abebe
Description: Poster presented at the 2012 ASIS&T Annual Meeting. This poster presents discussion on empowering digital library users through combining taxonomies and folksonomies.
Contributing Partner: UNT Libraries
Introduction: International Information Issues and ASIS&T

Introduction: International Information Issues and ASIS&T

Date: Summer 2014
Creator: Alemneh, Daniel Gelaw & Rorissa, Abebe
Description: Article introducing a special section of the Bulletin of the Association for Information Science and Technology (ASIS&T) featuring interviews, discussions of ASIS&T chapters and SIGs roles, networking activities, and past and current organizational initiatives.
Contributing Partner: UNT Libraries
Partnership for Enhancing Developing Countries' Capacity in Participating in Global Knowledge Production and Use

Partnership for Enhancing Developing Countries' Capacity in Participating in Global Knowledge Production and Use

Date: July 2013
Creator: Alemneh, Daniel Gelaw; Assefa, Shimelis & Rorissa, Abebe
Description: Poster discussing a partnership for enhancing developing countries' capacity in participating in global knowledge production and use. This poster highlights some of the contributing factors that enhance the capacity of African institutions to play active roles in the current global knowledge economy (in terms of information and knowledge creation, access, use and reuse).
Contributing Partner: UNT Libraries
Moodle for Professional Development to Agricultural Extension Professionals in Africa: Workshop

Moodle for Professional Development to Agricultural Extension Professionals in Africa: Workshop

Date: July 2013
Creator: Assefa, Shimelis; Alemneh, Daniel Gelaw & Rorissa, Abebe
Description: Presentation for the International Association of Agriculture Information Specialists (IAALD) World Congress. The authors discuss the Modular Object-Oriented Dynamic Learning Environment (Moodle) software package and its use for professional development to agriculture extension professionals in Africa.
Contributing Partner: UNT Libraries
Diffusion of Scientific Knowledge in Agriculture: The Case for Africa [paper]

Diffusion of Scientific Knowledge in Agriculture: The Case for Africa [paper]

Date: July 2013
Creator: Assefa, Shimelis; Alemneh, Daniel Gelaw & Rorissa, Abebe
Description: Paper discussing the diffusion of scientific knowledge on agriculture for Africa. Using exploratory research method, this paper set out to investigate existing knowledge diffusion models and their limitations, available best practices, and the potential to infuse translational research as a way to augment extension service programs in SSA agricultural practices.
Contributing Partner: UNT Libraries
Diffusion of Scientific Knowledge in Agriculture: The Case for Africa [presentation]

Diffusion of Scientific Knowledge in Agriculture: The Case for Africa [presentation]

Date: July 2013
Creator: Assefa, Shimelis; Alemneh, Daniel Gelaw & Rorissa, Abebe
Description: Presentation for the International Association of Agriculture Information Specialists (IAALD) World Congress. The authors discuss the diffusion of scientific knowledge on agriculture for Africa.
Contributing Partner: UNT Libraries
Content Divide: Africa and the Global Knowledge Footprint Sponsored by: SIG/III

Content Divide: Africa and the Global Knowledge Footprint Sponsored by: SIG/III

Date: October 2012
Creator: Assefa, Shimelis; Rorissa, Abebe; Alemneh, Daniel Gelaw & Albright, Kendra
Description: This paper discusses Africa and the global knowledge footprint.
Contributing Partner: UNT Libraries
The Origins of SIG-III and Its 30 Years' Journey: Visions and Reflections

The Origins of SIG-III and Its 30 Years' Journey: Visions and Reflections

Date: October 2012
Creator: Alemneh, Daniel Gelaw; Carbo, Toni; Caidi, Nadia; Gruzd, Anatoliy & Rorissa, Abebe
Description: This paper discusses the origins of the Special Interest Group for International Information Issues (SIG-III) of the American Society for Information Science & Technology (ASIS&T) and its early years.
Contributing Partner: UNT Libraries
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