University of Memphis

About: University of Memphis is a education organization based out in Memphis, Tennessee, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 7710 authors who have published 20082 publications receiving 611618 citations. The organization is also known as: U of M.

IEEE 802.11n: enhancements for higher throughput in wireless LANs

Abstract: This article introduces a new standardization effort, IEEE 802.11n, an amendment to IEEE 802.11 standards that is capable of much higher throughputs, with a maximum throughput of at least 100 Mb/s, as measured at the medium access control data services access point. The IEEE 802.11n will provide both physical layer and MAC enhancements. In this article we introduce some PHY proposals and study the fundamental issue of MAC inefficiency. We propose several MAC enhancements via various frame aggregation mechanisms that overcome the theoretical throughput limit and reach higher throughput. We classify frame aggregation mechanisms into many different and orthogonal aspects, such as distributed vs. centrally controlled, ad hoc vs. infrastructure, uplink vs. downlink, single-destination vs. multi-destination, PHY-level vs. MAC-level, single-rate vs. multirate, immediate ACK vs. delayed ACK, and no spacing vs. SIFS spacing.

The effects of social- and self-motives on the intentions to share positive and negative word of mouth

Abstract: We examine social- and self-motives as drivers of Word of Mouth (WOM). The main proposition is that the transmitter expects to gain personal and social benefits from sharing his opinion about a brand. The gains are in the form of expected satisfaction of self- and social-needs. In the research model, self-needs (i.e., self-enhancement and self-affirmation) are considered the initial driver of WOM. The desire for their satisfaction through WOM results in an intended social interaction, which in turn triggers social-motives: social-needs (i.e., social comparison and social bonding) and social-intentions (i.e., helping others and providing social information). WOM is the outcome of the intention to engage in a social interaction that is initiated by the intention to satisfy self-needs. Through an empirical analysis, we examine how the underlying mechanism varies for positive and negative WOM. Positive WOM is motivated primarily by the need for self-enhancement, and negative WOM is motivated by the need for self-affirmation. The need for social comparison affects both valences of WOM, the need for social bonding affects only positive WOM, and intention to help others and share social information affect only negative WOM. The findings suggest that discussing brands can be a mechanism for acquiring personal and social benefits, and consequently, promotional campaigns should highlight the gains customers accrue through WOM.

Effectiveness and Efficiency of Cross‐Border Knowledge Transfer: An Empirical Examination

Abstract: Based on a sample of 102 US organizations, this study examines the impact of knowledge characteristics, recipient learning intent, source attractiveness, and relationship quality on the effectiveness and efficiency of knowledge transfer from the international business affiliates of these organizations. Findings indicate that recipient learning intent and source attractiveness positively impact the effectiveness of knowledge transfer. In addition, recipient learning intent was found to have a positive effect on knowledge transfer efficiency. In particular, results highlight the strong positive impact that the quality of the relationship between the source and the recipient has on both the efficiency and effectiveness of cross-border knowledge transfer. The study also indicates that knowledge value is positively associated with recipient learning intent and that knowledge value, rarity and non- substitutability influence source attractiveness. Finally, findings suggest that the relationship between knowledge characteristics and knowledge transfer is partially mediated by recipient learning intent and source attractiveness.

Toward an understanding of developmental language and reading disorders.

Abstract: The primary purpose of this study was to compare the ability of language-impaired and reading-impaired children to process (i.e., encode and retrieve) phonological information. Four measures of phonological awareness and several measures of word and sentence repetition abilities were used to evaluate phonological processing skills. Two additional measures assessed children's awareness of lexical and morphological information. Subjects were 12 language-impaired (LI), 12 reading-impaired (RI), and 12 normal children between the ages of 6 and 8 years. The findings supported previous claims that children with reading impairments have difficulty processing phonological information. To our surprise, however, the LI children performed significantly worse than the RI children on only three measures, all involving word and sentence repetition. These findings raise questions about the distinctiveness of school-age children with a history of language impairment and poor readers with no history of language impairment.

Differential Competencies Contributing to Children's Comprehension of Narrative and Expository Texts

Abstract: This study examined the influences of reading decoding skills and world knowledge on third graders' comprehension of narrative and expository texts. Children read a narrative text and an expository text. Comprehension of each text was assessed with a free recall prompt, three cued recall prompts, and 12 multiple-choice questions. Tests from the Woodcock–Johnson III Tests of Achievement (Woodcock, McGrew, & Mather, 2001) were used to assess reading decoding skills and world knowledge. Comprehension was better for the narrative text than the expository text, and the effects of reader competencies depended on text genre. Comprehension of the narrative text was most influenced by reading decoding skills. In contrast, expository text comprehension was most influenced by world knowledge.