VictorJuiz/thesis huggingface dataset:
Antenna sector-time division multiple access system for indoor wireless communications

This thesis proposes a new 'multiple' access system for 'indoor wireless communications' based on ' sectored antennas'. Unlike previous sectored antenna indoor systems, this system incorporates the capability of reusing spectrum in different antenna sectors of the base station. It is shown that portable terminals located in different sectors of the indoor microcell may transmit/receive simultaneous data packets on the same frequency if their mutual interference is below a threshold level that guarantees an acceptable packet error rate. An experiment was devised to measure the mutual interference among portables located in some typical indoor environments. An algorithm is proposed for scheduling simultaneous packet transmissions, and its maximum throughput is investigated in the measured indoor locations. Experimental investigation was performed using ten sectors; a statistical model is used to investigate different sectorization levels. A new multi-carrier modulation scheme that requires less processing power is proposed, and the system throughput is investigated when operating with this new scheme and with the conventional multi-carrier scheme. The proposed system can significantly increase capacity when compared with systems that can transmit a single data packet per time slot. For example, while previous systems can transmit only one packet at a time, the proposed system can transmit on average more than four packets per time slot when operating with multi-carrier modulation and ten antenna sectors in an open indoor location. This same system configuration can transmit on average close to three packets per time slot in a closed indoor location with internal walls of concrete blocks.
Roles of the PHO85 cyclin-dependent kinase in budding yeast

Cyclin-dependent kinase (Cdk) complexes are essential activators of cell cycle progression in all eukaryotes. The activity of Cdks is regulated in part by their association with essential positive regulatory subunits called cyclins. In contrast to mammalian cells, in which multiple Cdks contribute to cell cycle progression, the budding yeast cell cycle is largely controlled by the activity of a single Cdk, Cdc28. In this thesis, I describe the identification of a second Cdk, Pho85, to have a role in cell cycle control in the budding yeast 'Saccharomyces cerevisiae' ('S. cerevisiae'). The Pho85 kinase, which is homologous to Cdc28, was first identified as a negative regulator of acid phosphatase gene expression in association with the Pho80 cyclin. Entry into the budding yeast mitotic cell cycle, or Start, requires Cdc28 and one of its three G1 cyclins, Cln1, Cln2, and Cln3. I show that in the absence of Cln1 and Cln2, the Pcl1 and Pcl2 G1 cyclins, in association with Pho85, become essential for the Start transition. Pcl2 associated with a Pho85-dependent kinase activity in G1 phase and phosphorylated a known target of the Pho85 kinase, Pho4, 'in vitro'. In addition, the Pcl2-Pho85 kinase had a different substrate specificity than Cdc28 and was not dependent on the Cdc28 kinase. Two-hybrid screening and data base searching identified seven new members of the Pho85 cyclin family. The putative Pho85 cyclins were placed into the Pcl1,2 or Pho80 subfamily based on sequence similarity in the cyclin box region which is a region conserved amongst all cyclins. Analysis of strains lacking members of the Pcl1,2 subfamily suggests a role for these cyclins in regulating cell morphogenesis. Finally, I present evidence to suggest a role for Pho85 in influencing G1-specific gene expression. 'In vitro', Pho85 interacted with the Swi5 transcription factor which controls expression of genes in G1 phase. ' In vivo', Pho85 was required for the asymmetric localization of an inhibitor of gene expression called Ash1 to daughter cell nuclei. Studies of the role for Pho85 in Ash1 localization are likely to reveal a novel function for a cyclin-Cdk complex in maintaining asymmetry in the cell.
By virtue of being white, racialized identity formation and the implications for anti-racist pedagogy

Although a number of programs have investigated the existence of racism in educational institutions, the literature does not address how white identity is constructed so as to resist self-awareness following anti-racist programming. This research, which employs poststructuralist and psychoanalytic theories of identity, investigates processes by which whiteness is inscribed as a normative construction of Canadian national identity particularly as performed in the discourses of white pre-service teachers. The narrative of the innocent Canadian overlaps with white participants' desires and identifications as ideal teachers. This narrative, which can be read in elite discourses as well as those of white research participants, is performed against loss of respectability as the non-legitimate abject other. The research examines ways in which the juxtaposition of the individual and the nation are narrated in the discourses of aspiring teachers who claim legitimacy as white citizen subjectivities. The research is conducted as semi-structured interviews with teacher education students who have completed a compulsory cross-cultural course. The method of discourse analysis employed in this research assumes that language is a performative act--both indicative and productive of the social and material identifications to which participants aspire regarding gender, race, sexuality, class, ability, and other normative identities. That participants have access to these discourses signals participant performance as legitimate, respectable white dominant identities and acceptable teacher candidates. Participants' conflicting desires acquired through various historic, social, and personal narratives include the myth of their racial superiority and innocence, and the idealization of equality. Participants' access to respectability depends on (1) their successful reading of the social practices which identify them as teachers, (2) the construction and management of difference so that whiteness is reproduced as normative practice, and (3) the successful performance of their lives as examples of "how to live". The dissertation raises significant issues for teacher educators engaged in oppositional work. The shape-shifting by which dominant identifications maintain their innocence suggests the potential for whiteness to affirm itself, even as a virtue. This dissertation demonstrates processes by which the power of dominant groups remains uncontested and resistant to oppositional pedagogies.
Memorial performance in anxiety and depression, an investigation using the process dissociation procedure

Both depression and anxiety appear to affect aspects of cognitive processing. The process dissociation procedure (PDP; Jacoby, 1991) was used to assess automatic and consciously-controlled memory biases in anxiety and depression. Memory for six word categories was examined: high positive affect, high negative affect, physical threat, negative self-referent, categorized neutral, and uncategorized neutral words. Study 1 examined differences in memorial performance of students with high and low anxiety sensitivity. The only memory difference between the groups was an unexpected higher conscious recollection for categorized neutral words in the high anxiety sensitive group. Study 2 compared the performance of students with high versus low scores on the Beck Depression Inventory (BDI). Students who scored high on the BDI showed a higher conscious recollection of high positive affect words in addition to a higher conscious recollection of all word categories overall when compared to those with low BDI scores. Study 3 examined memorial performance of patients with major depressive disorder with (SAD) and without (MDD) a seasonal pattern. When compared to a group of healthy controls, the depressed patients demonstrated a significantly lower conscious recollection of words overall. In addition, the MDD patients demonstrated significantly lower automatic memory overall when compared to SAD patients. Study 4 compared the performance of a subgroup of MDD patients who had been treated with an antidepressant for six weeks to healthy controls who were tested again after the same time period. The patients who responded to treatment did not differ from the controls in their conscious or automatic memory for the words, nor on any of the questionnaire measures. Finally, differences in memorial performance between the male and female participants were examined. The female students with high BDI scores consciously remembered more negative and fewer positive words than the high BDI male students. In contrast, female SAD patients showed a trend for higher automatic memory of positive words compared to male SAD patients. Implications of these results are discussed in relation to several theories of anxiety and depression as well as more general issues related to the study of cognitive processes in mood disorders.
Children's understanding of marital conflict and the marital relationship

Children's understanding of marital conflict and the marital relationship was investigated in 60 children (30 girls, 30 boys) from three age groups (5 years, 7 years, & 9 years). Age differences were hypothesized in children's conceptions of the causes of conflict, conflict resolution, the spousal relationship, family triangulation, and simultaneity of emotions. Children answered questions about stories involving family interactions. Five year old children explained conflict in terms of one person being right and one person being wrong whereas seven and nine year old children understood conflict as resulting from diverging goals. Five year old children thought that conflict resolution occurred by people stopping angry behaviour whereas older children made reference to how at least one person's goals needed to change. Children's understanding of triangulation increased with age. Seven and nine year old children think about their parents as parents and as one another's spouse, a distinction rarely made by five year old children. Significant age differences were not found in children's understanding of how both a positive and a negative emotion may be simultaneously directed to one person. In the literature examining the effects of marital conflict on children, the developmental constraints on children's understanding of conflict are rarely investigated. This study makes it clear that marital conflict is a very different type of stressor depending on the level of cognitive development of the child.
Transversal covers and packings

A transversal cover (packing) is a set of 'gk' points in 'k' disjoint groups of size 'g' and a minimum (maximum) collection of transversal subsets, called blocks, such that any pair of points not contained in the same group appear in at least (most) one block. A central question is to determine, for given 'g' and ' k', the minimum (maximum) possible 'b', denoted ' tc'('k, g') ('tp'('k, g')). Transversal covers axe applicable to software testing, data compression and error free communication. The case g = 2 was previously solved. Asymptotic results axe known for all 'g', but little was understood for small values of 'k'. We develop constructions, yielding upper bounds by four methods: incomplete transversal designs, concatenation techniques, generalized Wilson's constructions and group divisible designs. We develop three general lower bounds:<math> <f> tc<fen lp="par">k,g<rp post="par"></fen>>=&ceill0;<fen lp="par"> g<hsp sp="0.212"><rf>log</rf><hsp sp="0.212">k<rp post="par"></fen> /2&ceilr0;+g+1,</f> </math> using a construction; <math> <f> k<=<fr><nu>1</nu><de>2</de></fr><fen lp="par"><stk><lyr><hsp sp="0.167"><sup> 2<fen lp="fl"><fr><nu>b</nu><de>g</de></fr><rp post="fl"></fen> +<g>d</g><inf>b,g</inf></sup></lyr><lyr><fen lp="fl"><fr><nu> b</nu><de><rm><it>g</it></rm></de></fr><rp post="fl"></fen></lyr></stk> <rp post="par"></fen></f> </math> from the study of intersecting set-systems; and <math> <f> k<=<fen lp="fl"><fen lp="par"><fen lp="par"><stk><lyr>b</lyr> <lyr><fr><nu>b</nu><de>g</de></fr>-<fen lp="par">g-2<rp post="par"></fen> </lyr></stk><rp post="par"></fen>-<sum align="r"><ll>i=2</ll> <ul>n</ul></sum><fen lp="par"><stk><lyr>n</lyr><lyr>i</lyr></stk> <rp post="par"></fen><fen lp="par"><stk><lyr>b-n</lyr><lyr><fr><nu> b</nu><de>g</de></fr>-g-<fen lp="par">i-2<rp post="par"></fen> </lyr></stk><rp post="par"></fen><rp post="par"></fen>/g<fen lp="par"> <stk><lyr><fr><nu>b</nu><de>g</de></fr></lyr><lyr>g-2</lyr></stk> <rp post="par"></fen><rp post="fl"></fen>,</f> </math> when all points appear equally often, using a set packing argument. In addition, we investigate lower bounds for small 'k' that reduce or eliminate the gap between lower and upper bounds. Transversal packings are significantly less studied, but Abdel-Ghaffar and Abbadi found the maximum 'k' admitting ' b' > 'g', upper bounds and some optimality results, and discussed an application to optimal disk allocation. We develop constructions, yielding lower bounds, from incomplete transversal designs, Wilson's method, and techniques applied to an equivalent matching problem for graphs. Upper bounds axe derived from coding theory, standard packing arguments, and consideration of sets of disjoint blocks. We give tables and figures of the values obtained from these bounds for both transversal covers and packings, in the two appendices.
Oral non-Hodgkin's lymphomas and Epstein-Barr viral infection

Fifty eight oral non-Hodgkin's lymphomas (NHL) were subtyped with the Working Formulation, Updated Kiel and Revised European American Lymphoma classifications. EBER-1 in situ hybridization for Epstein-Barr virus (EBV) and immunohistochemistry for EBV antigens LMP, EBNA2 and ZEBRA proteins were performed to determine whether there was an association between oral NHL and latent or lytic EBV infection. Two thirds of the lymphomas were high grade. There were 45 B-cell lymphomas (78%) and 13 T-cell lymphomas (22%). The commonest histologic subtypes were diffuse large B-cell lymphomas (45%), followed by peripheral T-cell lymphomas (19%). Two thirds of the nine immunosuppression-related lymphomas were T-cell lymphomas. All the immunosuppression-related NHL were EBV-infected, whereas the EBV infection rate in immunocompetent patients was only 9%. Most EBV-positive tumours expressed neither LMP nor EBNA2, and coexpression of the two antigens occurred only in immunosuppressed patients.
Accelerated Corrosion and Repair of Reinforced Concrete Columns Using CFRP Sheets

This work presents the results of an experimental study involving large-scale reinforced columns which were corroded under an accelerated corrosion regime, repaired using carbon fibre reinforced plastic (CFRP) sheets, then tested to failure in compression. A total of seven columns were constructed: five were subjected to accelerated corrosion and three were repaired. One damaged, one repaired, and a control specimen were tested to structural failure. Cross-sectional cuts were made on a fourth, corrosion-damaged column for observation. The remaining specimens were held over for long-term study. Accelerated corrosion was achieved by adding sodium chloride to the mixing water, applying a current to the reinforcement cage, and subjecting the specimens to cyclic wetting and drying. Presented are conclusions regarding: (1) the optimum accelerated corrosion regime; (2) the effects of corrosion and CFRP repair on the mechanical behaviour of the columns; (3) the relationship between expansion and steel loss; and (4) the integration of fibre optic sensors in monitoring.
The role of peptides during thymocyte selection

T lymphocyte specificity for foreign pathogens is dictated by T cell receptor (TCR) surface expression. The TCR repertoire is generated during T cell development, when thymocytes undergo positive and negative selection. Although several models have speculated how TCRs distinguish between these two selection events, this subject has remained controversial due to a lack of direct substantiating evidence. To address this issue, thymocyte selection was analyzed utilizing an 'in vitro' mouse model that controlled for the expression of TCRs and interacting peptide/MHC complexes. A class I-restricted TCR transgenic mouse line, specific for lymphocytic choriomeningitis virus glycoprotein in the context of H-2Db, was bred into a ß 2-microglobulin (ß2m) deficient background. Positively and negatively selecting thymic stromal cells from these mice cannot present endogenous class I antigens. However, these cells can present exogenous peptide when fetal thymic lobes are cultured with media containing ß2m and H-2Db-binding peptide. Low concentrations of a strong peptide agonist mediated limited TCR transgenic positive selection, whereas high concentrations of this same peptide resulted in negative selection. A moderate peptide agonist induced efficient positive selection over a large concentration range. Although high doses of this ligand did not induce clonal deletion, proliferation assays demonstrated that these functional thymocytes were tolerant towards the positively selecting peptide. This moderate peptide agonist was also capable of inducing TCR transgenic positive selection in the absence of CD8 coreceptors. Lineage commitment occurred in a systematic manner, suggesting that MHC class I-restricted positive selection may involve an instructive, potentially coreceptor-independent mechanism. Together, these results contend that thymocyte selection is best described in terms of an affinity/avidity model of T cell development. Although thymocyte maturation is determined by TCR specificity, both positive and negative selection are facilitated by coreceptors. These studies also demonstrate that interactions with selecting peptides during T cell ontogeny define the functional reactivity of mature T cells.
Performance issues in the design of hierarchical-ring and direct networks for shared-memory multiprocessors

This dissertation explores performance issues in the design of interconnection networks for shared-memory multiprocessors. In particular, it considers low-dimensional direct (e.g., mesh and tori) and hierarchical-ring networks, and studies issues in topology, buffer management, switching, routing and flow control. The performance evaluation is primarily done by simulating the target systems at the register transfer level on a cycle-by-cycle basis using both synthetic and real (SPLASH-2) workloads. The contributions of the dissertation include: (1) the first extensive performance study specifically for shared-memory multiprocessor interconnection networks. Prior research focused primarily on distributed memory systems. It is important to consider shared-memory systems separately because of the different class of traffic they must support. (2) the first extensive simulation study of hierarchical-ring networks. Topologies that perform well are derived, and various cut-through switching techniques, such as wormhole, virtual cut-through, cell switching are evaluated under both blocking and non-blocking flow control policies. (3) a comprehensive comparative performance study of 2D mesh, 2D tori and hierarchical-ring networks. It is shown that the hierarchical-ring networks outperform the mesh and tori networks for system sizes smaller than 64 processors. (4) a novel deadlock free routing technique for wormhole switched hierarchical-ring networks using a virtual channel approach. (5) a novel priority-based network design that uses dynamic virtual channels and prioritized link arbitration with priority inheritance that results in improved system throughput and can be used to support multiple classes of traffic.
A comparison of friendship patterns of children with physical disabilities in integrated and segregated school settings

The purpose of this study was to investigate differences in friendship selection, quality of friendship, and self-concept in children with physical disabilities (PD) in integrated and segregated school settings. The participants were 25 children with PD (10 from integrated schools and 15 from a segregated school) who were 10 to 14 years of age. The participants took part in interviews in which they nominated their best friends and answered questions about their very best friends' age, gender, where they met and interacted, frequency of telephone use and visits outside of school. Parents and teachers completed an adapted version of this interview to corroborate the children's nominations. The Friendship Quality Questionnaire-Revised (Parker and Asher, 1989) was administered to the participants to assess quality of friendship. The Self-Perception Profile for Learning Disabled Students (Renick and Harter, 1988) was administered to assess self-concept. There were no significant differences between children with PD in integrated and segregated school settings in the number of friends nominated by the participants and the number of nominated friends corroborated by parents and teachers. Children with PD in segregated schools were more likely than children who are integrated to have best friends with PD. Children with PD in integrated schools exhibited higher overall quality of friendship, more intimacy and disclosure, and less conflict and betrayal in their relations with their very best friends than did children with PD attending segregated schools. There were no significant differences between children with PD in integrated and segregated school settings in self-concept.
Opening the healing path, the cultural basis for a solvent abusers treatment program for the Attawapiskat First Nation

Solvent abuse, particularly gasoline sniffing, has developed into a problem for the Attawapiskat youths since the 1980's. While there are treatment centres for solvent abusers, the success rate for treatment among First Nation youths is very low. In the community researched in this dissertation it is 0%. Among the causes identified for the low success rate in healing programs among Attawapiskat youths are 'cultural differences, culture shock' and ' inability to function in a' ''white'' 'society '. This dissertation is based on the suggestion that not only are acculturative stress and loss of the own culture the major contributing factors for the development of the problem, a cultural basis for the treatment program is also the only solution for successful treatment. The causal model for the solvent abuse problem in Attawapiskat and the cultural basis for a healing program was analyzed on the basis of interviews among the people of the community and solvent abusers themselves. Much of the discussion about the cultural basis refers to statements of elders of the community who are seen as the link to the people's culture. The presence of these cultural structures in the mind set of the people, even though they have been exposed to a life long assimilation attempt by the dominant society, can be identified from the statements of the solvent abusers themselves and other community members.