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While the role of the school principal has received much attention in stable environments, little research exists on principals working in conflict-affected countries. The purpose of this phenomenological study is to uncover perceptions of Somali principals in Mogadishu regarding their roles and lived experiences, as well as the challenges they face as they lead their schools amid ongoing conflict. In order to understand the different dimensions of the principal’s role and how this role is experienced in such a context, a descriptive phenomenology has been employed. A purposeful sample of eight primary school principals in Mogadishu, which has been the epicentre of the ongoing conflict, was indentified and the principals were interviewed. Through the six-step approach to phenomenological data analysis, as suggested by Creswell (2013), 11 themes were identified. Findings revealed that principals perceived their role as supporting teachers personally and professionally, supervising instruction, facilitating teacher professional development when the security situation permits, having good relationships with governing bodies, and building community collaboration. Findings also showed that, besides security concerns, student mobility, poor facilities, shortage of trained teachers and student discipline were the major challenges to principals. Findings further indicated that principals acted as boundary spanners using a variety of buffering and bridging strategies in an attempt to minimize uncertainty and security risks, as well as to adapt the school to the volatile environment. Furthermore, commitment to keep schools open, despite the huge challenges, a sense of responsibility for student safety, and calm and courageous actions in the face of danger were perceived as critical factors in sustaining principals in their positions. Four conclusions were drawn from the study, including principals’ lack of unity in the perception of their roles, principals’ lack of pre-service training, the possibility and essentiality of providing education during armed conflicts, and the importance of creating strong bonds through principals’ supportive roles. Recommendations were offered for primary principals, local educational umbrellas, NGOs, and UN agencies, as well as for further research possibilities.

Cette thèse examine comment les catégories de marché -ensembles qui partagent des similarités cognitives et culturelles- impactent la performance et l'évaluation des entreprises.Le consensus répandu dans la littérature indique que les organisations qui évoluent dans plus d'une catégorie sont sanctionnées tant au plan économique que social.Remettant en cause ce consensus actuel sur "l'impératif catégorique", cette thèse avance l'idée que les acteurs d'un marché ont un rôle plus complexe que simplement réprimer toute violation des catégories établies. Aussi dans ce contexte, être engagée dans plusieurs catégories de marché pour une organisation à la fois améliore son évaluation sociale mais réduit sa performance en cas de perceptions divergentes de ses affiliations catégorielles. Les données empiriques de cette thèse portent sur les cabinets d'avocats d'affaires dans trois grandes métropoles (New-York, Paris et Londres) au cours d'une décennie (2000-2010). Les cabinets d'avocats multi-services - ceux qui exercent dans plusieurs domaines du droit- obtiennent une meilleure évaluation de la part des clients tant au niveau global du cabinet que pour chacune de leurs spécialités juridiques. Toutefois, les désaccords entre clients en terme d'évaluation portant sur chacune des spécialités juridiques offertes détériorent la performance financière des cabinets. Cette thèse approfondit notre compréhension du rôle que jouent les catégories sur les marchés et les stratégies d'extensions catégorielles que les entreprises mettent en oeuvre. Ce travail contribue également aux études sur le champ juridique et a des implications pour la conduite stratégique des cabinets d'avocats d'affaires / This dissertation explores how market categories - clusters that share cognitive and cultural similarities - impact firms' performance and evaluation. Pervasive consensus in literature indicates organizations that do not fall into a single category suffer economic and social disadvantages.Unsettling this current consensus about the categorical imperative, this dissertation advocates that external audiences have a more complex role than simply patrolling the boundaries and sanctioning any infringement of established categories. They scrutinize categories in various ways depending on their needs. They infer some characteristics of firms from one category membership to another. They diverge about the category memberships and evaluation of firms. This dissertation provides evidence that in such cases, spanning categories both leads to positive social evaluations for organizations, but decreases performance in case of inconsistency across categories. Empirically I study the corporate legal services market in three major financial locations (New-York City, Paris and London) over a decade (2000-2010). My findings are twofold:(i) multi-category law firms- those that are engaged in several practice areas of law - receive better social evaluation from clients both at the firm level and at the practice area level; (ii) disagreement among clients' evaluation about law firms' practice areas undermines their financial performance. This dissertation deepens our understanding of the role that categorical structures play in markets and the category-stretching strategies firms implement to better navigate the "category map". This work contributes also to research in legal studies and has implications for law firms' business development

O problema da árvore geradora de comunicação ótima recebe um grafo com comprimentos não negativos nas arestas e um requerimento não negativo entre cada par de vértices; sendo o objetivo encontrar uma árvore geradora do grafo que minimize o custo de comunicação, que é a soma sobre cada par de vértice da distância entre eles na árvore vezes o requerimento entre eles. Este problema é NP-difícil, assim como vários casos particulares dele. Neste trabalho estudamos algumas variantes deste problema, introduzimos novos casos particulares que são também NP-difíceis e propomos esquemas de aproximação polinomial para alguns deles. / The optimum communication spanning tree problem receives a graph with non-negative lengths over the edges and non-negative requirements for each pair of nodes; being the objective to find a spanning tree of the graph that minimizes the communication cost, which is given by the sum, over each pair of nodes, of the distance, in the tree, between the nodes multiplied by the requirement between them. This problem and several of its particular cases are NP-hard. In this work we study some of the variants, also we introduce new NP-hard particular cases of the problem and propose polynomial approximation schemes for some of them.

Petal diagrams of knots are projections of knots to the plane such that the diagram has exactly one crossing. Petal diagrams offer a convenient and combinatorial way of representing knots via their associated petal permutation. In this thesis we study the fundamental group and Seifert surfaces of knots in petal form. Using the Seifert-Van Kampen theorem, we give a group presentation of the fundamental group of the knot complement of a knot in petal form. We then discuss Seifert surfaces and use decomposition diagrams to represent the Seifert surfaces of knots in petal form. We finally give an algorithm to produce a set of decomposition diagrams for a spanning surface of a knot in petal form and prove that for incompressible surfaces such decomposition diagrams are unique up to perturbation moves.

Biculturals are increasingly recognized as an important segment of managers, yet U.S.-based global organizations’ limited knowledge and recognition of this group’s distinctive experiences and related implications within their work environment limit the value placed on bicultural managers’ leadership of multicultural teams and the use of their competencies and skills to improve the effectiveness of multicultural teams. Notwithstanding, traditional leadership models are lacking in diversity and unanswered questions remain regarding the role of multiculturalism in global leadership and team effectiveness. The purpose of this qualitative exploratory multiple case study was to gain deeper understanding of the management experiences of biculturals in U.S.-based global organizations and the implications of their bicultural competencies and skills in leading multicultural teams. This study was framed by 3 concepts: bicultural competence, boundary spanning by bicultural managers, and leadership emergence in multicultural teams. Data were collected from semistructured interviews with 7 participants, reflective field notes, and archival data. Identifiable themes emerged through thematic analysis of the textual data and cross-case synthesis analysis. Five conceptual categories that enclosed a total of 16 themes were identified. The conceptual categories are (a) bicultural competence, (b) boundary spanning, (c) cultural intelligence, (d) global identity, and (e) leading multicultural teams. Findings may drive social change by challenging the status quo in existing formal work structures and promoting diversity in the workplace creating emerging avenues for business growth and building bridges of communication between the business world and society.

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This study examines how one college in a large private university sought to benefit its students by implementing a program of faculty-mentored, co-curricular high impact practices (HIPs). This qualitative single case study uses confirmatory and exploratory document analysis to examine how an educational leader translated institutional purpose via unit leaders and program managers into the educational practice of faculty mentors. The researcher found stronger and weaker areas of alignment of institution purpose to educational practice across a systems theory-based purpose-to-practice continuum. Variety in the concentration of themes across the data may be due to how these themes were emphasized in the administrative directives and could indicate a training gap in HIPs. In addition, the researcher found that certain HIPs were used more frequently, first- and second-year undergraduates rarely participated, and themes emerged from the educational practice narrative that were important to participants that did not appear in institutional purpose documents. The study offers recommendations to leaders in higher education to (a) use institutional purpose language clearly in administrative directives; (b) educate faculty to create high-quality HIP opportunities for underserved students; and (c) acknowledge program impacts that fall outside declared institutional purpose.

Most professionals working in the field of information technology and communication are able to also work with digital media outside working hours, which could blur the distinction between work and private life. The aim of the study is to examine how the perceived health of these professionals is affected when the boundaries between work and private life blur and to identify the positive and negative aspects of using digital media outside of working hours. The effects on the actual health of professionals working in this line of work are not being examined in this study. Based on existing literature on aspects of working with digital media outside working hours, a quantitative and qualitative survey was distributed to employees working with information technology and/or communication. The study was complemented by additional qualitative interviews. The results suggest that the perceived health of the majority of respondents was negatively impacted by working with digital media outside of working hours. The main reason for this is that they feel overwhelmed with information. One of the conclusions of this study is that respondents may be negatively influenced by the use of digital media outside of working hours but that this does not have to be the case necessarily. A further conclusion is that there are complex combinations of advantages and disadvantages from these aspects which affect respondents more individually. In addition, the study shows that companies need to be aware of the advantages and disadvantages of using digital media outside working hours in order to provide healthy working conditions for their employees.

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