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Given a graph G=(V,E), a vertex ordering of G is a total order v1,v2,...,vn of V. A graph search algorithm is a systematic method for visiting each vertex in a graph, naturally producing a vertex ordering of the graph. We explore the problem of determining whether a given vertex in a graph can be the end (last) vertex of a search ordering for various common graph search algorithms when restricted to various graph classes, as well as the related problem of determining if a vertex is an end-vertex when a start vertex is specified for the search. The former is referred to as the end-vertex problem, and the latter is the beginning-end-vertex problem. For the beginning-end-vertex problem, we show it is NP-complete on bipartite graphs as well as degree restricted bipartite graphs for Lexicographic Breadth First Search, but solvable in polynomial time on split graphs for Breadth First Search. We show that the end-vertex problem is tractable for Lexicographic Breadth First Search on proper interval bigraphs and for Lexicographic Depth First Search on chordal graphs. Further, we show that the problem is NP-complete for Lexicographic Breadth First Search and Depth First Search on bipartite graphs. / Graduate

This thesis is a use-wear study that deals with microwear on stone endscrapers used on one worked material: animal skins. The first part of the study defines and describes the process of rendering freshly skinned pelts into functional leather or rawhide products, addressing confusing terminology found in the literature as well. Problems with past use-wear experiments dealing with animal skins are also confronted and explained. The second part of the study examines endscrapers used to flesh and dehair bison hides and compares the use-wear traces left on the tool edge by each activity. This suite of characteristics is then compared to those found on an assemblage of Clovis-age scrapers from the Gault site in central Texas.

Syftet med detta examensarbete var att undersöka MEMS och elektretmikrofoner för att finna vilken typ som lämpar sig bäst för företaget Comfort Audio AB och deras hörselhjälpmedelsprodukter. Utöver detta undersöktes möjligheter att kontrollera upptagningskarakteristik med hjälp av en teknik vid namn end-fire. Resultaten har erhållits genom att undersöka ett antal elektroakustiska egenskaper hos olika mikrofoner, som sedan har jämförts med respektive tillverkares tekniska specifikationer. Upptagningskarakteristiken har undersökts genom konstruktion av en mikrofonuppsättning där den summerade signalen undersökts. Analys av signalstyrka och frekvensinnehåll har sedan resulterat i polärdiagram, där upptagningskarakteristik visas. Specifikationer samt egna beräkningar och mätningar visar att MEMS kan vara ett alternativ till elektretmikrofoner. Riktad upptagning kunde påvisas i end-fire konstruktionen. / The purpose of this study was to investigate MEMS and electret microphones to find the best suited microphone type for the company Comfort Audio AB and their hearing aid products. The study also investigated the possibilities to control microphone polar pattern by using a method called end-fire. The results have been obtained by examining a number of electro-acoustic properties of different microphones, which have been compared with the manufacturer's specifications. Polar patterns have been studied by construct an end fire array. Analysis of the signal content has resulted in polar diagrams, where characteristics are displayed. The specifications of the manufacturer’s, our own calculations and measurements shows that MEMS could be an alternative to electret microphones. Difference in polar characteristics was proved in the end-fire array.

With new medical advances in technology, there has been a push from the legal, medical and political communities to re-examine the policies of end-of-life-care. End-of-life-care (EOLC) is a term that refers to not only a patient’s final hours of life, but also the medical care of individuals with terminal illnesses or conditions that have become advanced and incurable. For the purpose of this paper, I will be referring to physician-assisted death and active euthanasia as forms of end-of-care. The Politics of End-of –Life-Care: Active Euthanasia and Physician-assisted Death examines the political disjuncture between the evidence presented in favour of active euthanasia (AE), physician-assisted death (PAD) and the current practice of refusing to grant AE and PAD legal status in Canada. It will examine the political dynamics underlying the disjuncture using political pressure groups, constructivism, rational choice, institutionalism and structuralism. There is empirical evidence that demonstrates support for the legalization of AE and PAD. Sixty-seven percent of Canadians support AE /PAD and 80 percent support allowing physicians to assist in AE and PAD (Angus Reid 2012) however, Parliament has not legalized AE/PAD and the CMA has not sanctioned AE /PAD. The two sides of the debate have clearly communicated their arguments. The arguments on each side are strong and have merit. Conversely, the arguments against AE and PAD appear to hold more weight with institutions than with the public. This thesis examines a number of different reasons for why AE/PAD remains illegal in Canada despite society’s widespread support for AE/PAD. The results of the research found no one method explains the disjuncture between the evidence presented in favour of active euthanasia and the current practice of refusing to grant it legal status. However, discursive institutionalism does help elites to generate and communicate the discourse of AE and PAD. It also explains how discourse can also occur from the bottom which results in a new discourse. For example, physicians, politicians, and the public who have deviated from the accepted discourse on AE and PAD can help to create a new discourse regarding AE and PAD policies.

For young infants, knowledge of physical objects and animate agents seems highly rigid, with no information combined across domains. Adult cognition, however, is more flexible. In this thesis, I use a special category of object—a tool—that can only be reasoned about appropriately if information is combined across domains. Using this special case, I examine whether older infants are capable of integrating functional information about the tool while making inferences about the intent of the tool-user. Experiment 1 shows that infants can reason about complex means-end sequences involving tools; and Experiments 2 and 3 both show that under some circumstances, infants can take into account functional information about the tool when making these sorts of inferences. Together, these studies extend previous findings about how infants understand complex means-end sequences, and demonstrate that by 13 months, infants are already combining knowledge across domains. / Thesis (Master, Psychology) -- Queen's University, 2007-08-28 11:26:07.974

The technological complexity of the ICU is often focused on saving lives however, it is frequently a place to support the dying. Because of the serious nature of critical illness, patients are unable to communicate their wishes, values and views. Family members are often called upon to communicate the critically ill patients’ wishes and many report feeling burdened with the task. The distress described may lead to difficulty mobilizing coping mechanisms and may affect their ability to make appropriate decisions for their family member’s care. Hence, an in depth understanding of the surrogate’s experience is critical to plan effective interventions and provide anticipatory guidance to support the process of making decisions around end of life care. Objective The purpose of the study is to describe the surrogate decision makers’ appraisals of the demands of decision making for a critically ill adult intensive care unit patient and the coping strategies employed by them during this experience. Method A descriptive study design using a qualitative interviewing approach extracted perceived stressors and coping strategies using systematic, focused thematic analysis guided by Folkman and Lazarus’ Stress and Coping Paradigm. Findings Respondents appraisals identified the following perceived stressors: doubt of self efficacy, unknowns, impingement of real life, and problematic relay of information. The surrogates’ perception of their ability to manage the decision making process required their awareness of the decision making role and magnitude of illness, their need to form partnerships, time to reflect on prior discussions and experience, and their appraisal of the patients’ suffering. Participants described emotion and problem based coping strategies they employed during the task. To emotionally justify their decisions, surrogates’ referred to their understanding of patient wishes and sought solace and comfort from the health care staff. In addition, surrogates used strategies to solve problems encountered including dealing with others, employing strategies to decrease their uncertainty and mobilizing time to process the events unfolding. Conclusions End of life decisions in the intensive care are complex and demanding. A better understanding of the process may guide health care professionals in developing focused interventions to assist surrogates through a painful process. / Thesis (Master, Nursing) -- Queen's University, 2008-04-25 09:29:27.1

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The purpose of this study was, first, to further our understanding of the experience of dying in a long-term care (LTC) facility from the perspective of family members and second, to identify the relationships between the various factors which may influence satisfaction with end-of-life care. Using a sequential mixed methods design, a convenience sample of 87 family members completed a survey interview using a modified version of the Toolkit of Instruments to Measure End-of-life Care (TIME) Nursing Home Version in the first phase of the study. Findings from the parametric and non-parametric analyses indicated that family satisfaction with end-of-life care was best predicted by contact and communication with nursing staff, feeling that care provided at the end of life met expectations, staff providing consistent care, feeling that the health care aide listened to their concerns about care and that respondents felt they had received enough emotional support. Being transferred to hospital in the last month of life, dying in a place other than the LTC facility, and respondent age and employment status were all associated with significant mean differences in satisfaction scores. In the second phase, three focus groups were conducted to further explore areas of satisfaction and dissatisfaction with end-of-life care. Focus groups provided confirmation of the findings of the first phase of the study and were instrumental in developing a list of ten recommendations for improvements in end-of-life care delivery. Recommendations for future research are made based on the study results.

Emergency departments (EDs) are often thought of solely as places where life-saving interventions occur. However, EDs are also places where dying patients receive end of life care. Though research examining expert nurse behaviours in care of the dying has been conducted in a variety of care settings, little is known about this topic as it relates to care of the dying adult in the ED. A descriptive exploratory study was conducted with registered nurse experts (n = 6) in two urban EDs in Western Canada. Five expert nurse behaviours deemed essential in care of the dying adult patient in the ED were identified: 1) providing comfort; 2) honouring the personhood of the patient; 3) responding to the family; 4) responding after the death of the patient; and 5) responding to colleagues. These findings contribute to the empirical evidence concerning expert nursing care of the dying.