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UNT Scholarly Works
Unsupervised Large-Vocabulary Word Sense Disambiguation with Graph-based Algorithms for Sequence Data Labeling
Date: October 2005
Creator: Mihalcea, Rada
Description: This paper introduces a graph-based algorithm for sequence data labeling, using random walks on graphs encoding label dependencies. The algorithm is illustrated and tested in the context of an unsupervised word sense disambiguation problem, and shown to significantly outperform the accuracy achieved through individual label assignment, as measured on standard sense-annotated data sets.
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc30977/
UNT: SubFinder: Combining Knowledge Sources for Automatic Lexical Substitution
Date: June 2007
Creator: Hassan, Samer; Csomai, Andras; Banea, Carmen; Sinha, Ravi & Mihalcea, Rada
Description: This paper describes the University of North Texas SubFinder system. The system is able to provide the most likely set of substitutes for a word in a given context, by combining several techniques and knowledge sources. SubFinder has successfully participated in the best and out of ten (oot) tracks in the SEMEVAL lexical substitution task, consistently ranking in the first or second place.
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc30997/
UNT-Yahoo: SuperSenseLearner: Combining SenseLearner with SuperSense and other Coarse Semantic Features
Date: June 2007
Creator: Mihalcea, Rada; Csomai, Andras & Ciaramita, Massimiliano
Description: In this paper, the authors describe the SuperSenseLearner system that participated in the English all-words disambiguation task. The system relies on automatically-learned semantic models using collocational features coupled with features extracted from the annotations of coarse-grained semantic categories generated by an HMM tagger.
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc30998/
User-Based Channel Assignment Algorithm in a Load-Balanced IEEE 802.11 WLAN
Date: 2009
Creator: Haidar, Mohamad; Al-Rizzo, Hussain M.; Chan, Yupo & Akl, Robert G.
Description: This article discusses a user-based channel assignment algorithm in a load-balanced IEEE 802.11 WLAN. A new load balancing algorithm is presented based on power management of Access Points (APs) to reduce congestion at hot spots in Wireless Local Area Networks (WLANs) and to assign channels to APs. The algorithm first finds the Most Congested Access Point (MCAP), then decreases its transmitted power in discrete steps, and the process continues until the users' assignment which leads to a high balance index is reached. A new mathematical programming formulation is then applied to assign channels to the APs such that the Signal-to-Interference Ratio (SIR) at the users' level is maximized. Results show that the algorithm is capable of reducing the overall congestion at hot spots in a WLAN and increases the SIR significantly for cases involving relatively large WLANs. In the process, network throughput is increased.
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc30851/
Using Encyclopedic Knowledge for Automatic Topic Identification
Date: May 2009
Creator: Coursey, Kino High & Mihalcea, Rada
Description: This paper presents a method for automatic topic identification using an encyclopedic graph derived from Wikipedia. The system is found to exceed the performance of previously proposed machine learning algorithms for topic identification, with an annotation consistency comparable to human annotations.
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc31022/
Using the Essence of Texts to Improve Document Classification
Date: September 2005
Creator: Mihalcea, Rada & Hassan, Samer
Description: This paper explores the possible benefits of the interaction between automatic extractive summarization and text classification. Through experiments performed on standard test collections, the authors show that techniques for extractive summarization can be effectively combined with classification methods, resulting in improved performance in a text categorization task. Moreover, comparative results suggest that the synergy between text summarization and text classification can be regarded as a new application-oriented evaluation testbed for automatic summarization.
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc30978/
Using Wikipedia for Automatic Word Sense Disambiguation
Date: April 2007
Creator: Mihalcea, Rada
Description: This paper describes a method for generating sense-tagged data using Wikipedia as a source of sense annotations. Through word sense disambiguation experiments, the authors show that the Wikipedia-based sense annotations are reliable and can be used to construct accurate sense classifiers.
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc31000/
Virtualization Based Secure Execution And Testing Framework
Date: December 2011
Creator: Kotikela, Srujan Das; Nimgaonkar, Satyajeet & Gomathisankaran, Mahadevan
Description: This article discusses virtualization based secure execution and testing. Computer security aims at protecting confidentiality, integrity, and availability of sensitive information that are processed, used, or stored by computing systems. Computer scientists working in the field of computer security have successfully designed and developed software and hardware mechanisms to provide security in modern day computing devices. As compared to hardware security mechanisms, software-only security mechanisms are easy to implement and patch. But software-only security mechanisms cannot ensure protection against hardware-based attacks, thus rendering them vulnerable to such attacks. Hardware mechanism such as secure architectures aim to root the trust of the security solution in the hardware architecture. These security architectures typically deploy security mechanisms like encryption/decryption to protect confidentiality and hashing to protect data integrity. Though the security provided by hardware secure architectures is reliably high, they require modifications to the processor micro-architecture. Any changes to the micro-architecture is an extremely costly and time consuming process. Also, testing these hardware secure architectures is difficult as it requires testing the complete system including hardware, software and applications. Recently, virtualization has emerged to be an efficient and cost effective technology that allows emulating hardware mechanisms. It also enables emulating new hardware features ...
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc94275/
WARM SRAM: A Novel Scheme to Reduce Static Leakage Energy in SRAM Arrays
Date: February 2004
Creator: Gomathisankaran, Mahadevan & Tyagi, Akhilesh
Description: This presentation accompanies a paper discussing research on a novel scheme to reduce static leakage energy in SRAM arrays. The increasing sub-threshold leakage current levels with newer technology nodes have been identified by ITRS (2001) as one of the major fundamental problems faced by the semiconductor industry. Concurrently, the expected performance improvement and functionality integration expectations drive the continued reduction in feature size. This results in ever-increasing power per unit area and the accompanying problem of heat removal and cooling as stated in J.M.C. Stork (1995). Portable battery-powered applications, fuelled by pervasive and embedded computing, have seen tremendous growth and have reached a point where battery energy and power density can't be increased further according to T. Bell (1991). This raises the computational throughput per watt target for the future technology nodes. SRAM arrays which are used widely as a system component, such as caches and register files, in both high-performance and portable systems, are getting to be dominant power consumers because of their large capacity and area. Hence any reduction in cache energy can result in considerable overall power reduction. The authors propose a novel circuit technique using depletion mode devices, to reduce the static energy of SRAM array ...
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc96819/
WiFi and WCDMA Network Design
Date: April 2005
Creator: Akl, Robert G.
Description: This presentation discusses WiFi access point selection and traffic balancing, multi-cell wideband code division multiple access (WCDMA) with multiple classes, user modeling using 2D Gaussian distribution, and intra-cell and inter-cell interference and capacity.
Contributing Partner: UNT College of Engineering
Permallink:digital.library.unt.edu/ark:/67531/metadc30935/