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- All Subjects: Communication
- Creators: Arizona State University
- Creators: College of Integrative Sciences and Arts
Description
The rapid advancement of wireless technology has instigated the broad deployment of wireless networks. Different types of networks have been developed, including wireless sensor networks, mobile ad hoc networks, wireless local area networks, and cellular networks. These networks have different structures and applications, and require different control algorithms. The focus of this thesis is to design scheduling and power control algorithms in wireless networks, and analyze their performances. In this thesis, we first study the multicast capacity of wireless ad hoc networks. Gupta and Kumar studied the scaling law of the unicast capacity of wireless ad hoc networks. They derived the order of the unicast throughput, as the number of nodes in the network goes to infinity. In our work, we characterize the scaling of the multicast capacity of large-scale MANETs under a delay constraint D. We first derive an upper bound on the multicast throughput, and then propose a lower bound on the multicast capacity by proposing a joint coding-scheduling algorithm that achieves a throughput within logarithmic factor of the upper bound. We then study the power control problem in ad-hoc wireless networks. We propose a distributed power control algorithm based on the Gibbs sampler, and prove that the algorithm is throughput optimal. Finally, we consider the scheduling algorithm in collocated wireless networks with flow-level dynamics. Specifically, we study the delay performance of workload-based scheduling algorithm with SRPT as a tie-breaking rule. We demonstrate the superior flow-level delay performance of the proposed algorithm using simulations.
ContributorsZhou, Shan (Author) / Ying, Lei (Thesis advisor) / Zhang, Yanchao (Committee member) / Zhang, Junshan (Committee member) / Xue, Guoliang (Committee member) / Arizona State University (Publisher)
Created2013
Description
Concussion, a subset of mild traumatic brain injury (mTBI), has recently been brought to the forefront of the media due to a large lawsuit filed against the National Football League. Concussion resulting from injury varies in severity, duration, and type, based on many characteristics about the individual that research does not presently understand. Chronic fatigue, poor working memory, impaired self-awareness, and lack of attention to task are symptoms commonly present post-concussion. Currently, there is not a standard method of assessing concussion, nor is there a way to track an individual's recovery, resulting in misguided treatment for better prognosis. The aim of the following study was to determine patient specific higher-order cognitive processing deficits for clinical diagnosis and prognosis of concussion. Six individuals (N=6) were seen during the acute phase of concussion, two of whom were seen subsequently when their symptoms were deemed clinically resolved. Subjective information was collected from both the patient and from neurology testing. Each individual completed a task, in which they were presented with degraded speech, taxing their higher-order cognitive processing. Patient specific behavioral patterns are noted, creating a unique paradigm for mapping subjective and objective data for each patient's strategy to compensate for deficits and understand speech in a difficult listening situation. Keywords: concussion, cognitive processing
ContributorsBerg, Dena (Author) / Liss, Julie M (Committee member) / Azuma, Tamiko (Committee member) / Caviness, John (Committee member) / Arizona State University (Publisher)
Created2013
Description
It is not a new idea that there may be a "silver lining" in depression for some people; that grappling with this condition has the potential to make them stronger or more capable in some way. Over the past three decades, research has proliferated on growth associated with adversity; from life-threatening illness to natural disasters, the death of a loved one, physical abuse, and numerous other forms of trauma. However, very little empirical attention has been paid to the topic of growth resulting from the process of working through psychological distress. Rather, the extant literature tends to consider conditions like depression and anxiety as unsuccessful outcomes, or failed attempts at coping. Furthermore, evidence suggests there is considerable variability in the types of growth perceived by individuals experiencing different forms of adversity. Using interpretative phenomenological analysis (IPA), a qualitative research method, the current study elucidates the experience of growth associated with depression among six individuals from diverse backgrounds. The superordinate themes that emerged from the analysis include: depression as a catalyst for personal development (creative, spiritual, and intellectual); social support and connection; greater presence or engagement in life; a more adaptive and realized sense of self; feelings of gratitude and appreciation; and a recognition of the timing of depression. Each of these themes is examined in relation to participants' processes of meaning making in their experience of growth. The findings of the current study are broadly compatible with, yet qualitatively distinct from, previously identified models of adversarial growth. Implications for future research and clinical practice are discussed.
ContributorsBarratt, T. M (Author) / Kinnier, Richard T (Thesis advisor) / Van Puymbroeck, Christina M (Committee member) / Arciniega, G. Miguel (Committee member) / Arizona State University (Publisher)
Created2014
Description
Newer communication technologies (CTs) will always vie with more mature technologies for the attention of time-constrained legislators. As continual advances in CT make new methods of communication available to legislators, it is important to understand how newly introduced CTs influence novel and changing legislator behaviors. The mixed-method research presented in this study provides deep insights into the relationships between legislators and the CTs they use. This study offers many contributions, among them: it effectively bridges a gap between existing Internet Enabled CT (IECT) behavioral studies on non-legislators by expanding them to include legislator behavior; it expands existing narrowly focused research into the use of CT by legislators by including both IECT and mature CTs such as face-to-face meetings and telephone; it provides a fresh perspective on the factors that make CTs important to legislators, and it uncovers legislator behaviors that are both useful, and potentially harmful, to the process of democracy in the United States. In addition, this study confirms and extends existing research in areas such as minority party constituent communication frequency, and extends the topic of legislator CT behavior into some unanticipated areas such as constituent selective behaviors and the use of text messaging during floor debates which effectively enable lobbyists and paid consultants to participate real-time in floor debates in the Arizona House and Senate.
ContributorsWest, Joe, 1959- (Author) / Corley, Elizabeth A (Thesis advisor) / Johnston, Erik W., 1977- (Committee member) / Svara, James H. (Committee member) / Arizona State University (Publisher)
Created2014
Description
The National Association of Community College Teacher Education Programs (NACCTEP) was established to promote the community college role in the recruitment, preparation, retention, and renewal of teachers. NACCTEP is led by a 13-member executive board consisting of community college teacher education administrators and faculty members from across the United States. Board members expressed concern that their first year consisted of them trying to learn their role as a board member including how to participate in board activities. By the time they became fully knowledgeable about their role and became more active participants, their two-year term was completed. They also indicated that initially they felt disconnected from veteran board members. To address this issue, an orientation/leadership suite was developed for new board members to assist them in transitioning from peripheral roles to full active roles. The suite included activities such as an association orientation web page, participation in monthly board conference calls, a face-to-face leadership session, and mentoring by veteran board members. The communities of practice (CoP) framework shaped this action research study and the activities of the suite were designed to foster a CoP. This action research study utilized a mixed-method research approach in which both qualitative and quantitative instruments were used to gather data. The descriptive statistics indicated that on average, new board members perceived mentoring was effective, understood their role on the board, experienced a sense of a community of practice, considered themselves as active on the board, and believed the leadership orientation suite was effective. An analysis of the qualitative data resulted in four themes: community, communication, participation, and efficacy. Overall, the findings indicated that the new board member orientation/leadership suite assisted new board members transition from peripheral roles to active leadership roles through developing a sense of community; facilitating and sustaining communication; defining, supporting, and encouraging participation; and increasing efficacy in their roles. Through the learning of their roles, the new board members became knowledgeable, comfortable, and confident in serving as board members, which facilitated their participating in the NACCTEP board's CoP.
ContributorsOstos, Ray A (Author) / Buss, Ray (Thesis advisor) / Barnett, Joshua (Committee member) / De Los Santos, Gerardo (Committee member) / Arizona State University (Publisher)
Created2013
Description
The purpose of this dissertation was to develop a Compassionate Communication Scale (CCS) by conducting a series of studies. The first study used qualitative data to identify and develop initial scale items. A series of follow-up studies used exploratory factor analysis to investigate the underlying structure of the CCS. A three-factor structure emerged, which included: Compassionate conversation, such as listening, letting the distressed person disclose feelings, and making empathetic remarks; compassionate touch, such as holding someone's hand or patting someone's back; and compassionate messaging, such as posting an encouraging message on a social networking site or sending a sympathetic email. The next study tested convergent and divergent validity by determining how the three forms of compassionate communication associate with various traits. Compassionate conversation was positively related to compassion, empathetic concern, perspective taking, emotional intelligence, social expressivity, emotional expressivity and benevolence, and negatively related to verbal aggressiveness and narcissism. Compassionate touch was positively correlated with compassion, empathetic concern, perspective taking, emotional intelligence, social expressivity, emotional expressivity, and benevolence, and uncorrelated with verbal aggressiveness and benevolence. Finally, compassionate messaging was positively correlated with social expressivity, emotional expressivity, and uncorrelated with verbal aggressiveness and narcissism. The next study focused on cross-validation and criterion-related validity. Correlations showing that self-reports of a person's compassionate communication were positively related to a friend or romantic partner's report of that person's compassionate communication provided cross-validation. The test for criterion-related validity examined whether compassionate communication predicts relational satisfaction. Regression analyses revealed that people were more relationally satisfied when they perceived themselves to use compassionate conversation, when they perceived their partner to use compassionate conversation, and when their partner reported using compassionate conversation. This finding did not extend to compassionate touch or compassionate messaging. In fact, in one regression analysis, people reported more relational satisfaction when they perceived that their partners used high levels of compassionate conversation and low levels of compassionate touch. Overall, the analyses suggest that of the three forms of compassionate communication, compassionate conversation is most strongly related to relational satisfaction. Taken together, this series of studies provides initial evidence for the validity of the CCS.
ContributorsRamos Salazar, Leslie (Author) / Guerrero, Laura (Thesis advisor) / Roberto, Anthony (Committee member) / Millsap, Roger (Committee member) / Arizona State University (Publisher)
Created2013
Description
While numerous studies have examined the nature of masculinity, scholars seldom seek to determine the meaning of manhood or to explore which types of individuals are culturally permitted to call themselves men. One scholarly approach suggests that the meaning of a cultural category can best be illuminated through examining marginalized examples within that category. Based on this assumption, this project illuminates cultural understandings of manhood in the United States by examining the experience of men within two marginalized categories--gay and transsexual--who have often found themselves fighting for the right to call themselves men at a time when hegemonic assumptions about manhood have required that one had been designated male at birth, claims a heterosexual orientation, and exhibits characteristics that are stereotypically masculine. For gay men who were born male, social marginalization could result from one's gay orientation as well as from a perceived lack of masculine traits. For some transsexual gay men, all three of the traditional markers of manhood may be absent or deemed insufficient. This scenario calls into question what it is that all men have in common if the concept of manhood is to be associated with any stable definition. Within rhetorical analysis, the concept of textual fragmentation suggests that a rhetorical critic performs an analysis of a text by examining dense textual fragments; the critic's audience members then produce what they perceive to be a finished discourse in their own minds. Along these lines, this project illuminates the concept of manhood by examining dense textual fragments found within mass media representations and personal narratives, and concludes that one's manhood is determined based on the degree to which one identifies with others who call themselves men. Therefore, manhood can best be framed, not as a specific identity with a stable definition, but as a body of intersecting identifications specific to a particular cultural location and time period. As such, it is linked to cultural systems of power and oppression, illustrating that the claim to manhood as an identity is a rhetorical act that is not free from controversy.
ContributorsBooth, Ewan Tristan (Author) / Brouwer, Daniel C. (Thesis advisor) / Martinez, Jacqueline M. (Committee member) / Fisher, Jill A. (Committee member) / Arizona State University (Publisher)
Created2012
Description
Research literature and popular press articles were reviewed to uncover the influences and viewer pleasures received from watching reality television. A close semiotic analysis of the reality television program, Teen Mom, was conducted. The semiotic analysis looked at the characters, the structure of the show, and the show's use of graphics and audio to understand the show's influences on viewers. An analysis of the Teen Mom website and online forum was also conducted. Seventy-one viewer posts and 403 viewer responses were analyzed to uncover viewer reactions to the show. The results were significant in three ways. First, the producers of the show claim the show is meant to educate viewers on the effects of teen pregnancy. The analysis found that while the show sends educational messages, it also contradicts itself by glamorizing teen pregnancy. Second, the analysis of the online forum revealed the formation of close online communities among Teen Mom viewers. Third, the website analysis provided evidence of viewer pleasure resulting from voyeuristic and social comparison tendencies. It is plausible that Teen Mom viewers engage with the show for the opportunity to observe parts of other people's lives they would not normally be permitted to see. At the same time, viewers evaluate themselves in comparison to the Teen Mom cast members.
ContributorsPadelford, Sarah (Author) / Ramsey, Ramsey E (Thesis advisor) / Gruber, Diane (Committee member) / Wise, Greg (Committee member) / Arizona State University (Publisher)
Created2012
Description
This study utilized targeted messages and expert and referent sources in an effort to promote physical activity behavior in college students. College students aged 18-25, excluding collegiate athletes, were randomized into three conditions using their current physical activity level. Two of the conditions received targeted messages highlighting three primary components of social cognitive theory - self-efficacy, outcome expectations, and goals - while the third condition received no messages. In addition, the experimental conditions received the messages from either an expert (i.e., a personal trainer) or a referent (i.e., a close friend). In this way, this experiment analyzed whether receiving social cognitive theory messages increased physical activity indicators compared to the control condition, as well as if the message source caused differences in the physical activity indicators. Moreover, participants completed Time 1 and Time 2 measures to determine if receiving messages or not caused changes over a one week time period. Seven physical activity indicators were assessed: self-efficacy, positive outcome expectations, negative outcome expectations, attitudes, response-efficacy, intentions, and physical activity behavior. Results revealed that both the personal trainer and close friend conditions had significantly higher scores than the control condition for intentions at Time 1 and Time 2, as well as physical activity behavior at Time 2. Moreover, the personal trainer condition had significantly higher positive outcome expectations compared to both the friend and control conditions. No other significant differences were found across conditions for Time 1 attitudes, response-efficacy, negative outcome expectations, self-efficacy, and Time 2 attitudes, and self-efficacy. Overall, targeted messages were effective in increasing physical activity intentions and behavior regardless of the message source.
ContributorsMarmo, Jennifer Lauren (Author) / Roberto, Anthony J. (Thesis advisor) / Mongeau, Paul A. (Committee member) / Ainsworth, Barbara E. (Committee member) / Arizona State University (Publisher)
Created2012
Description
Research on the impact of stress on the academic performance of Hispanic undergraduate students is limited, leaving institutions of higher education without needed information about how to better support this growing population of students. The purpose of this study was to identify stressors that have a negative impact on academic performance of Hispanic undergraduate students. Themes were derived from focus groups and interviews regarding stress, stressors and related academic performance impacts of Hispanic undergraduate students attending a large multi-campus urban university and incorporated into a survey addressing common stressors, their impact on academic performance, stress impact on other areas of life, stress management ability, and demographic characteristics. The survey was administered to a random sample of Hispanic undergraduate students using an online format (n = 169). Descriptive statistics were used to examine frequencies. Stressors were placed into themes and tested for reliability of fit using Cronbach's Alpha. Pearson's Chi-Square and Cramer's V were used to measure association. Significance was set at ¡Ü .05. Overall stress of respondents resulted in serious performance effects among 32.5% of respondents and moderate performance effects among 43.8% of respondents. Stress impeded academic performance at least weekly among 36.1% of respondents. Stressors resulting in the most serious stress and academic performance effects included family, time factors, finances, and academics. Moderate stress and academic performance effects were evident in stressors related to mental health, technology, commuting, personal concerns, physical health and legal problems. The majority of respondents indicated doing a fair (n = 84, 49.7%) or good (n = 52, 30.8%) job managing stress. The remaining 20.0% (n = 33) of respondents did a poor job managing stress. Students with lower grade-point averages managed stress poorly compared to students with higher grade-point averages, X2 (6, N = 163) = 15.222, p = .019, Cramer's V = .019. These findings provide evidence that stressors related to family, time factors, finances, and academics, and overall stress have considerable negative effects on the academic performance of Hispanic undergraduate students. Institutions of higher education can improve academic outcomes among this student population by addressing and reducing the impact of common stressors affecting these students.
ContributorsMoses, Karen S (Author) / De Los Santos, Jr., Alfredo G. (Thesis advisor) / Ewing, Kris (Thesis advisor) / Melnyk, Bernadette (Committee member) / Arizona State University (Publisher)
Created2012