Dissertations / Theses on the topic 'Recovery problems'
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1
Carry, Hugh. "Recovery from alcohol problems without treatment." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69560.
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Recovery from alcohol problems without treatment is a subject that has received little attention in the addictions literature. This study used media advertising to solicit people who had resolved a drinking problem on their own. The research used a semi-structured interview as a basis for a qualitative analysis of the phenomenon of recovery without treatment. Attention was focused on reasons offered for resolving a problem and factors involved in maintenance of that resolution. Rccovery methods used by these subjects are compared with those commonly recommended by most treatment programs, including Alcoholics Anonymous. The issues of labelling and acceptance are also discussed.
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Pryer, Tristan Martin. "Recovery methods for evolution and nonlinear problems." Thesis, University of Sussex, 2010. http://sro.sussex.ac.uk/id/eprint/6285/.
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Functions in finite dimensional spaces are, in general, not smooth enough to be differentiable in the classical sense and “recovered” versions of their first and second derivatives must be sought for certain applications. In this work we make use of recovered derivatives for applications in finite element schemes for two different purposes. We thus split this Thesis into two distinct parts. In the first part we derive energy-norm aposteriori error bounds, using gradient recovery (ZZ) estimators to control the spatial error for fully discrete schemes of the linear heat equation. To our knowledge this is the first completely rigorous derivation of ZZ estimators for fully discrete schemes for evolution problems, without any restrictive assumption on the timestep size. An essential tool for the analysis is the elliptic reconstruction technique introduced as an aposteriori analog to the elliptic (Ritz) projection. Our theoretical results are backed up with extensive numerical experimentation aimed at (1) testing the practical sharpness and asymptotic behaviour of the error estimator against the error, and (2) deriving an adaptive method based on our estimators. An extra novelty is an implementation of a coarsening error “preindicator”, with a complete implementation guide in ALBERTA (versions 1.0–2.0). In the second part of this Thesis we propose a numerical method to approximate the solution of second order elliptic problems in nonvariational form. The method is of Galërkin type using conforming finite elements and applied directly to the nonvariational(or nondivergence) form of a second order linear elliptic problem. The key tools are an appropriate concept of the “finite element Hessian” based on a Hessian recovery and a Schur complement approach to solving the resulting linear algebra problem. The method is illustrated with computational experiments on linear PDEs in nonvariational form. We then use the nonvariational finite element method to build a numerical method for fully nonlinear elliptic equations. We linearise the problem via Newton's method resulting in a sequence of nonvariational elliptic problems which are then approximated with the nonvariational finite element method. This method is applicable to general fully nonlinear PDEs who admit a unique solution without constraint. We also study fully nonlinear PDEs when they are only uniformly elliptic on a certain class of functions. We construct a numerical method for the Monge–Ampère equation based on using “finite element convexity” as a constraint for the aforementioned nonvariational finite element method. This method is backed up with numerical experimentation.
3
Marotta, Jeffrey Jon. "Recovery from gambling problems with and without treatment." online access from Digital Dissertation Consortium access full-text, 1999. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?9934151.
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Reed, S. M. "Groundwater recovery problems associated with opencast mine backfills." Thesis, University of Nottingham, 1986. http://eprints.nottingham.ac.uk/11881/.
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The research outlined in this thesis is concerned with the environmental aspects of groundwater re-establishment as a consequence of surface mining. No principal effects which have been identified as being detrimental to the restored land area are as follows; i). The vertical and horizontal displacements of backfill materials following restoration, and ii). The pollution of groundwater from contact with weathered rockfill materials. The research into settlement has attempted to classify the types of movement which may occur within a backfill mass, in particular the differential movements which are of great importance to the stability of proposed structures or surface drainage. The field results from 10 opencast mine sites are presented, 3 of which were instrumented for detailed field investigations. It has been shown that backfill movements do not necessarily show similar trends under similar conditions, and reasons for this are proposed. A variety of instrumentation schemes have been devised to examine backfill displacements, both vertically and horizontally. Permeability testing has been conducted at different horizons the backfill mass in order to locate the zones of collapse settlement due to groundwater recovery. A critical review of the instrumentation utilised in the investigations is presented, with suggestions for improvement. Investigations into groundwater pollution have been devoted to examining the qualities of groundwater flowing into British surface mines and evaluating its likely reactions with fill materials. An insight into general groundwater pollution and treatment techniques is presented together with a critical analysis of their applicability, to British conditions. An investigation into water qualities in each of the six geographical regions of the opencast mining industry of Great Britain is detailed. Finally some suggestions for future research areas are indicated.
5
Lakhany, Asif. "Finite element recovery techniques in adaptive error control." Thesis, Brunel University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262505.
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Trede, Dennis. "Inverse problems with sparsity constraints convergence rates and exact recovery." Berlin Logos-Verl, 2010. http://d-nb.info/1002361532/04.
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Demeyere, Gillian P. "Recovery in tort for workplace sexual harassment, problems and prospects." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ54064.pdf.
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Muñoz-Campos, Gregorio. "Problems of cost recovery in housing projects : "La Pimienta, a case study"." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/76010.
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Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1988.Title as it appears in M.I.T. Graduate List, June 1988: Housing policies in Mexico--a case study.
Includes bibliographical references.
by Gregorio Muñoz-Campos.
M.C.P.
9
Jan, Farida. "Effectiveness of recovery-focused mental health care of older people with memory problems." Thesis, University of Hertfordshire, 2015. http://hdl.handle.net/2299/15486.
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Introduction: Dementia is a syndrome due to disease of the brain, usually of a chronic nature, in which there is disturbance of multiple higher cortical functions including Memory, Comprehension, Thinking, Judgment, Orientation, language and communication skills and abstract thinking. It is one of the most challenging disorders both in terms of prevalence and economic burden. There are currently approximately 800,000 people with dementia in UK and national cost is 17 billion per year. It is estimated that in next thirty years, number of people with dementia will increase to 1.4 million and the national cost will be over 50 billion. The exceptional advances in modern medicine in terms of prolonging life expectancy do not necessarily improve the care delivered to people with dementia. Dementia is a progressive condition where clinical recovery is not possible despite the discovery of cognition enhancing drugs. This belief leads to low expectations that tend to erode hope and foster indignity. Advances in treatment of Alzheimer’s disease have, however, stimulated new thinking and methods of service delivery. At certain stage of their illness, if not from the very beginning, personal, and social recovery becomes more meaningful for service users than their clinical recovery. Objective: To investigate whether recovery-orientated psychiatric assessment and therapeutic intervention enhances the wellbeing of people with memory problems and their family carers. Method: This study was a preliminary randomised control study. Patients were randomly allocated to recovery focus group or treatment as usual group acting as the control. Participants in the recovery focus group received a recovery-focused pre-diagnostic wellbeing assessment and counselling, diagnostic consultation with written feedback and post-diagnostic support over a period of six months. Participants in both groups were assessed using the WHO Wellbeing Index (WHO-5) as the primary outcome measure. The Mini Mental State Examination, Cornell Scale for Depression in Dementia, EuroQol-5D and Zarit Burden Interview were used as secondary outcome measures. Written records of the narrative accounts of participants in the recovery focus group were also obtained. Results: 48 patients with early dementia were recruited and agreed to take part in the study. Out of these, 34 patients completed the study, of which 17 patients were in the recovery focus group and 17 patients were in the treatment as usual group (control).There was a significant difference between the groups in terms of greater improvement in wellbeing as rated by the WHO – 5 Wellbeing Index in the recovery focus group compared to the control group. The secondary outcome measures in the areas of cognition, quality of life and caregiver burden showed no differences between the groups. However, case histories from the recovery focus group identified the main areas of improvement in improved mood, increased social interaction, reduction in carer strain and/or burden and improved self-worth and/or confidence. Conclusions: This study shows that recovery focused care can enhance the wellbeing of people with mild to moderate dementia. The additional benefits perceived by the patients and their relatives /carers include improvement in mood symptoms, social interaction and confidence as well as reduction in carer burden and strain.
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Thompson, Andrew J. "Quantitative analysis of algorithms for compressed signal recovery." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/9603.
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Compressed Sensing (CS) is an emerging paradigm in which signals are recovered from undersampled nonadaptive linear measurements taken at a rate proportional to the signal's true information content as opposed to its ambient dimension. The resulting problem consists in finding a sparse solution to an underdetermined system of linear equations. It has now been established, both theoretically and empirically, that certain optimization algorithms are able to solve such problems. Iterative Hard Thresholding (IHT) (Blumensath and Davies, 2007), which is the focus of this thesis, is an established CS recovery algorithm which is known to be effective in practice, both in terms of recovery performance and computational efficiency. However, theoretical analysis of IHT to date suffers from two drawbacks: state-of-the-art worst-case recovery conditions have not yet been quantified in terms of the sparsity/undersampling trade-off, and also there is a need for average-case analysis in order to understand the behaviour of the algorithm in practice. In this thesis, we present a new recovery analysis of IHT, which considers the fixed points of the algorithm. In the context of arbitrary matrices, we derive a condition guaranteeing convergence of IHT to a fixed point, and a condition guaranteeing that all fixed points are 'close' to the underlying signal. If both conditions are satisfied, signal recovery is therefore guaranteed. Next, we analyse these conditions in the case of Gaussian measurement matrices, exploiting the realistic average-case assumption that the underlying signal and measurement matrix are independent. We obtain asymptotic phase transitions in a proportional-dimensional framework, quantifying the sparsity/undersampling trade-off for which recovery is guaranteed. By generalizing the notion of xed points, we extend our analysis to the variable stepsize Normalised IHT (NIHT) (Blumensath and Davies, 2010). For both stepsize schemes, comparison with previous results within this framework shows a substantial quantitative improvement. We also extend our analysis to a related algorithm which exploits the assumption that the underlying signal exhibits tree-structured sparsity in a wavelet basis (Baraniuk et al., 2010). We obtain recovery conditions for Gaussian matrices in a simplified proportional-dimensional asymptotic, deriving bounds on the oversampling rate relative to the sparsity for which recovery is guaranteed. Our results, which are the first in the phase transition framework for tree-based CS, show a further significant improvement over results for the standard sparsity model. We also propose a dynamic programming algorithm which is guaranteed to compute an exact tree projection in low-order polynomial time.
11
Madabushi, Ananth R. "Lagrangian Relaxation / Dual Approaches For Solving Large-Scale Linear Programming Problems." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36833.
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This research effort focuses on large-scale linear programming problems that arise in the context of solving various problems such as discrete linear or polynomial, and continuous nonlinear, nonconvex programming problems, using linearization and branch-and-cut algorithms for the discrete case, and using polyhedral outer-approximation methods for the continuous case. These problems arise in various applications in production planning, location-allocation, game theory, economics, and many engineering and systems design problems. During the solution process of discrete or continuous nonconvex problems using polyhedral approaches, one has to contend with repeatedly solving large-scale linear programming(LP) relaxations. Thus, it becomes imperative to employ an efficient method in solving these problems. It has been amply demonstrated that solving LP relaxations using a simplex-based algorithm, or even an interior-point type of procedure, can be inadequately slow ( especially in the presence of complicating constraints, dense coefficient matrices, and ill-conditioning ) in comparison with a Lagrangian Relaxation approach. With this motivation, we present a practical primal-dual subgradient algorithm that incorporates a dual ascent, a primal recovery, and a penalty function approach to recover a near optimal and feasible pair of primal and dual solutions.
The proposed primal-dual approach is comprised of three stages. Stage I deals with solving the Lagrangian dual problem by using various subgradient deflection strategies such as the Modified Gradient Technique (MGT), the Average Direction Strategy (ADS), and a new direction strategy called the Modified Average Direction Strategy (M-ADS). In the latter, the deflection parameter is determined based on the process of projecting the unknown optimal direction onto the space spanned by the current subgradient direction and the previous direction. This projected direction approximates the desired optimal direction as closely as possible using the conjugate subgradient concept. The step-length rules implemented in this regard are the Quadratic Fit Line Search Method and a new line search method called the Directional Derivative Line Search Method in which we start with a prescribed step-length and then ascertain whether to increase or decrease the step-length value based on the right-hand and left-hand derivative information available at each iteration. In the second stage of the algorithm (Stage II), a sequence of updated primal solutions is generated using some convex combinations of the Lagrangian subproblem solutions. Alternatively, a starting primal optimal solution can be obtained using the complementary slackness conditions. Depending on the extent of feasibility and optimality attained, Stage III applies a penalty function method to improve the obtained primal solution toward a near feasible and optimal solution.
We present computational experience using a set of randomly generated, structured, linear programming problems of the type that might typically arise in the context of discrete optimization.Master of Science
12
Hobbs, Mia. "The role of hope in recovery from mental health problems : a grounded theory analysis." Thesis, University of East London, 2008. http://roar.uel.ac.uk/3773/.
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Hope is an area of rapidly increasing interest within clinical psychology and mental health. It has emerged as a major theme within qualitative research based on recovery narratives, and government guidelines recommend that clinicians encourage hope in their clients in order to facilitate recovery. Although theoretical papers have proposed models of the role of hope in recovery from mental health problems, there is no model grounded in how people with experience of recovery speak about this process. In addition, existing literature fails to address how clients speak about the role of mental health professionals in this process. This study used eight interviews with people who had experience of recovery from mental health problems to investigate how they spoke about the role of hope in recovery, and the role of clinicians in this process. A grounded theory analysis resulted in the construction of a model of the complex interaction between hope and recovery. The three main categories were 'the influence of others on hope', 'personal hope' and 'doing recovery'. Important findings included that the model of hope in recovery was characterised by sudden increases in hope throughout a slow and fluctuating recovery 'journey' and that hearing positive narratives of recovery from similar others was a particularly important source of hope and inspiration. Clinicians were also considered to have a pivotal role in clients' hope for recovery. This study contributes towards operationalising how clinicians may implement the guidelines advising them to encourage hope in their clients and highlights the powerful role that they have in this process.
13
Daley, Stephanie Karen. "The applicability of the concept of recovery for older people with mental health problems." Thesis, King's College London (University of London), 2014. http://kclpure.kcl.ac.uk/portal/en/theses/the-applicability-of-the-concept-of-recovery-for-older-people-with-mental-health-problems(bfcbf103-e861-4d13-8e96-20f1cf12337f).html.
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Despite the emphasis on recovery in services for adults of working age, equivalent developments and research in older people’s mental health services (OPMHS) have not taken place. In this thesis, the applicability of the concept of ‘recovery’ to older people with mental health problems is explored. First, a qualitative study was undertaken with 28 service users and 10 carers, which produced a conceptual framework of recovery for older people with mental health problems. This highlighted similarities and differences in the experience of recovery for older people compared to their younger peers. This was used to identify the working practice implications and to develop an intervention for staff working within OPMHS and intended effects. A feasibility study was undertaken to optimise the intervention and evaluation strategy, and to define the trial parameters for a future definitive trial. The intervention was delivered to 204 staff working in 15 clinical teams in South London, UK. The hypotheses were that the intervention would improve recovery and quality of life for service users. A ‘controlled before and after’ (CBA) design was used with 103 service user participants at baseline, who were interviewed across three time points. Process evaluation comprised: qualitative interviews with staff and trainers (n=15), pre-post staff ratings of recovery knowledge and attitude (n=176), fidelity assessment and an audit of care plans of 328 service users.
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Smith, Thomas A. "Saving more than souls a recovery support group ministry of the church /." Online full text .pdf document, available to Fuller patrons only, 2000. http://www.tren.com.
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Irving, James Graeme. "How does AA's 12 Steps and membership of the Fellowship of Alcoholics Anonymous work for addressing drinking problems?" Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/how-does-aas-12-steps-and-membership-of-the-fellowship-of-alcoholics-anonymous-work-for-addressing-drinking-problems(0daaa05c-5030-4102-b8f5-ac1eb48c318a).html.
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Alcoholics Anonymous (AA) is the world’s largest and most recognisable recovery ‘program’, and central to its philosophy is the 12 Step Program. AA is a global organisation of 2.2 million members worldwide (AAWS, 2001), with a reported 3,600 weekly meetings in the United Kingdom (AAWS, 2011). AA has made many claims in their literature about the program’s effectiveness (AAWS, 2001: 84). Alcoholism is associated with a number of very serious health and social problems, including involvement in crime (Finney 2004; Fitzpatrick, 2010; Alcohol Reduction Strategy 2003). As fiscal pressure mounts, groups such as AA will be of interest to policy makers. Through an analysis of interviews with twenty long-term abstinent members of Alcoholics Anonymous, the thesis seeks to explain the effects of participation in AA’s therapeutic practices. Evidence from the literature on AA, revealed three concepts key to understanding participation in AA: Motivation to Engage (MtE), Structured Social Engagement (SSE), and Personal Agency (PA). A hypothetical model of AA-mediated behavioural change, constituted by these elements, was constructed and the findings supported this putative model. Further analysis revealed the coping strategies members of AA employed that ensured engagement with AA during stressful life events that threatened abstinence. The model was adapted to incorporate the temporal effects of long-term engagement with AA. Elements of Maruna’s (2001: 73) Condemnation Script resonated in the narratives of AA members. Contra Maruna’s analysis, AA members accepted ‘condemnation script’, but these were not negative, limiting beliefs. AA’s therapeutic practices structure, a coherent sense of self, one that supports cessation from negative patterns of drinking. The data exposed the sustained usage of AA’s discourse in the narrative accounts given. This finding extends Borkman’s (1976) Experiential Knowledge thesis, a language of ‘truth’ based on personal experience. The ‘linguistic echoes’ embedded in each narrative, suggests that a person uses AA’s discourse to ‘scaffold’ their recovery. This thesis provides an explanation of AA’s therapeutic practices of how adherence to AA’s principles, cognitively restructures the individual towards mastering self-control. AA’s philosophy and the following empirical evidence asserts abstinence as pre-requisite for recovery from alcohol dependence.
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Apostolopoulos, Theofanis. "Heuristics for computing sparse solutions for ill-posed inverse problems in signal and image recovery." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/heuristics-for-computing-sparse-solutions-for-illposed-inverse-problems-in-signal-and-image-recovery(acfde268-5d4e-4c6a-8a15-f94b33b62c72).html.
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For almost a century the famous theorem of Shannon-Nyquist has been very important in digital signal processing applications as the basis for the number of samples required to efficiently reconstruct any type of signal, such as speech and image data. However, signals and images are mainly stored and processed in huge files, which require more storage space, they take longer to transmit and they demand a large computational cost for processing. For this purpose many compression techniques have been introduced including the emerging field of Compressed Sensing (CS). CS is a novel and fast sampling and recovery process, which has attracted considerable research interest with several new application areas. By exploiting the signal and the measurements structure we are able to recover a signal from what was previously considered as highly under-sampled measurements, according to the Shannon- Nyquist criterion. This reconstruction is accomplished by finding the sparsest solution for an ill-posed system of linear equations, which is an NP-hard combinatorial optimisation problem. This thesis focuses on the l0-norm based minimisation problem which arises from sparse signal or image recovery, using the CS technique. A new, fast heuristic is proposed to directly minimise a continuous function of the l0 norm. This swarm based stochastic method provides better sparse solutions for highly under-sampled and over-sampled cases even under the presence of noise with small error and less time complexity, compared with several well-known competing approaches. The evaluation methodology includes different parameters of the l0-heuristic and is based on measuring recovery error and execution time under various sparsity levels, sample sizes, sampling matrices and transform domains. The mathematical background of CS, including the key aspects of sparsity and incoherence in measurements are also provided, together with applications and further open research questions, such as weakly sparse signals in noisy environments.
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Willemsen, Madelon. "Delivering insights to improve the management of threatened species recovery programs - A Grounded Theory of the Problems of Species Recovery Program Management in Australia." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18767.
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In general, there are problems with existing conservation and recovery programs in Australia and globally, which means that effective delivery of conservation programs is rarely achieved. The extensive interdisciplinary research into these problems almost exclusively takes place from the conservation paradigm perspective, which emphasises the reductionist-deductive research approach. Despite this research and the number of recommendations and tools available to improve recovery program management, the effectiveness of Australia’s recovery programs is widely questioned by academia and practitioners, and is called a national disgrace in the media (Cox 2018). This research takes an inductive research approach and uses the grounded theory method to analyse the lived experiences of the professionals involved in Australian recovery programs. The main research question was: How can recovery program management in Australia become more effective and efficient? The research outcomes present a substantive theory that ‘the current “organisation” of recovery programs does not include the appropriate dimensions to manage recovery programs effectively.’ The explanation of the associated theoretical model demonstrates the core pattern of three problem dimensions for the institution of recovery programs and delivers insights into the root causes of the problems of recovery program management. This new knowledge and understanding informed the conceptual framework and practical recommendations to improve recovery program management. To the researcher’s knowledge, this research is the first to apply grounded theory methodology as a theory-building technique to the problems of recovery program management in Australia. The delivery of a new understanding of the root causes of the problems experienced in recovery program management, contributes to conservation discipline research and provides practical guidance to improving recovery program management in Australia in particular and generally worldwide.
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Brown, Jaimee. "Secure public-key encryption from factorisation-related problems." Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16386/1/Jaimee_Brown_Thesis.pdf.
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Public key encryption plays a vital role in securing sensitive data in practical
applications. The security of many encryption schemes relies on mathematical
problems related to the difficulty of factoring large integers. In particular,
subgroup problems in composite order groups are a general class of problems
widely used in the construction of secure public-key encryption schemes. This
thesis studies public-key encryption schemes that are provably secure based on
the difficulty of subgroup or other integer factorisation related problems in the
standard model.
Firstly, a number of new public-key encryption schemes are presented which
are secure in the sense of indistinguishability against chosen-ciphertext attack
in the standard model. These schemes are obtained by instantiating the two
previous paradigms for chosen-ciphertext security by Cramer and Shoup, and
Kurosawa and Desmedt, with three previously studied subgroup membership
problems. The resulting schemes are very efficient, and are comparable if not
superior in terms of efficiency when compared to previously presented instantiations.
Secondly, a new approach is presented for constructing RSA-related public
key encryption schemes secure in the sense of indistinguishability against chosenciphertext
attack without random oracles. This new approach requires a new
set of assumptions, called the Oracle RSA-type assumptions. The motivating
observation is that RSA-based encryption schemes can be viewed as tag-based
encryption schemes, and as a result can be used as a building block in a previous
technique for obtaining chosen-ciphertext security. Two example encryption
schemes are additionally presented, each of which is of comparable efficiency to
other public key schemes of similar security.
Finally, the notion of self-escrowed public-key infrastructures is revisited,
and a security model is defined for self-escrowed encryption schemes. The security definitions proposed consider adversarial models which reflect an attacker's
ability to recover private keys corresponding to public keys of the attacker's
choice. General constructions for secure self-escrowed versions of ElGamal, RSA,
Cramer-Shoup and Kurosawa-Desmedt encryption schemes are also presented,
and efficient instantiations are provided. In particular, one instantiation solves
the 'key doubling problem' observed in all previous self-escrowed encryption
schemes. Also, for another instantiation a mechanism is described for distributing
key recovery amongst a number of authorities.
19
Brown, Jaimee. "Secure public-key encryption from factorisation-related problems." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16386/.
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Public key encryption plays a vital role in securing sensitive data in practical applications. The security of many encryption schemes relies on mathematical problems related to the difficulty of factoring large integers. In particular, subgroup problems in composite order groups are a general class of problems widely used in the construction of secure public-key encryption schemes. This thesis studies public-key encryption schemes that are provably secure based on the difficulty of subgroup or other integer factorisation related problems in the standard model. Firstly, a number of new public-key encryption schemes are presented which are secure in the sense of indistinguishability against chosen-ciphertext attack in the standard model. These schemes are obtained by instantiating the two previous paradigms for chosen-ciphertext security by Cramer and Shoup, and Kurosawa and Desmedt, with three previously studied subgroup membership problems. The resulting schemes are very efficient, and are comparable if not superior in terms of efficiency when compared to previously presented instantiations. Secondly, a new approach is presented for constructing RSA-related public key encryption schemes secure in the sense of indistinguishability against chosenciphertext attack without random oracles. This new approach requires a new set of assumptions, called the Oracle RSA-type assumptions. The motivating observation is that RSA-based encryption schemes can be viewed as tag-based encryption schemes, and as a result can be used as a building block in a previous technique for obtaining chosen-ciphertext security. Two example encryption schemes are additionally presented, each of which is of comparable efficiency to other public key schemes of similar security. Finally, the notion of self-escrowed public-key infrastructures is revisited, and a security model is defined for self-escrowed encryption schemes. The security definitions proposed consider adversarial models which reflect an attacker's ability to recover private keys corresponding to public keys of the attacker's choice. General constructions for secure self-escrowed versions of ElGamal, RSA, Cramer-Shoup and Kurosawa-Desmedt encryption schemes are also presented, and efficient instantiations are provided. In particular, one instantiation solves the 'key doubling problem' observed in all previous self-escrowed encryption schemes. Also, for another instantiation a mechanism is described for distributing key recovery amongst a number of authorities.
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Poddar, Sunrita. "Joint recovery of high-dimensional signals from noisy and under-sampled measurements using fusion penalties." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6623.
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The presence of missing entries pose a hindrance to data analysis and interpretation. The missing entries may occur due to a variety of reasons such as sensor malfunction, limited acquisition time or unavailability of information. In this thesis, we present algorithms to analyze and complete data which contain several missing entries. We consider the recovery of a group of signals, given a few under-sampled and noisy measurements of each signal. This involves solving ill-posed inverse problems, since the number of available measurements are considerably fewer than the dimensionality of the signal that we aim to recover. In this work, we consider different data models to enable joint recovery of the signals from their measurements, as opposed to the independent recovery of each signal. This prior knowledge makes the inverse problems well-posed. While compressive sensing techniques have been proposed for low-rank or sparse models, such techniques have not been studied to the same extent for other models such as data appearing in clusters or lying on a low-dimensional manifold. In this work, we consider several data models arising in different applications, and present some theoretical guarantees for the joint reconstruction of the signals from few measurements. Our proposed techniques make use of fusion penalties, which are regularizers that promote solutions with similarity between certain pairs of signals.
The first model that we consider is that of points lying on a low-dimensional manifold, embedded in high dimensional ambient space. This model is apt for describing a collection of signals, each of which is a function of only a few parameters; the manifold dimension is equal to the number of parameters. We propose a technique to recover a series of such signals, given a few measurements for each signal. We demonstrate this in the context of dynamic Magnetic Resonance Imaging (MRI) reconstruction, where only a few Fourier measurements are available for each time frame. A novel acquisition scheme enables us to detect the neighbours of each frame on the manifold. We then recover each frame by enforcing similarity with its neighbours. The proposed scheme is used to enable fast free-breathing cardiac and speech MRI scans.
Next, we consider the recovery of curves/surfaces from few sampled points. We model the curves as the zero-level set of a trigonometric polynomial, whose bandwidth controls the complexity of the curve. We present theoretical results for the minimum number of samples required to uniquely identify the curve. We show that the null-space vectors of high dimensional feature maps of these points can be used to recover the curve. The method is demonstrated on the recovery of the structure of DNA filaments from a few clicked points. This idea is then extended to recover data lying on a high-dimensional surface from few measurements. The formulated algorithm has similarities to our algorithm for recovering points on a manifold. Hence, we apply the above ideas to the cardiac MRI reconstruction problem, and are able to show better image quality with reduced computational complexity.
Finally, we consider the case where the data is organized into clusters. The goal is to recover the true clustering of the data, even when a few features of each data point is unknown. We propose a fusion-penalty based optimization problem to cluster data reliably in the presence of missing entries, and present theoretical guarantees for successful recovery of the correct clusters. We next propose a computationally efficient algorithm to solve a relaxation of this problem. We demonstrate that our algorithm reliably recovers the true clusters in the presence of large fractions of missing entries on simulated and real datasets.
This work thus results in several theoretical insights and solutions to different practical problems which involve reconstructing and analyzing data with missing entries. The fusion penalties that are used in each of the above models are obtained directly as a result of model assumptions. The proposed algorithms show very promising results on several real datasets, and we believe that they are general enough to be easily extended to several other practical applications.
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Blank, Alison. "'It's not just about the money' : the meaning of work for people with severe and enduring mental health problems : an interpretative phenomenological analysis." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/6446.
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“It’s not just about the money”: the meaning of work for people with severe and enduring mental health problems – an interpretative phenomenological analysis. Aim – to explore the meaning of work for people living with severe and enduring mental health problems. Method - Ten participants were recruited and interviewed initially; eight at six months; four at eighteen months. A longitudinal approach was chosen to facilitate capturing changes in the participants’ life worlds. The method used was interpretative phenomenological analysis (IPA). Findings - Three overarching themes were identified. Building and maintaining an occupational identity expressed the ways in which participants used occupations as the building blocks of an evolving identity; some viewed work as a socially valued way of doing this. Most of the participants had aspirations towards work, and occupation in a broad sense was seen as an essential component of recovery from mental ill health. Work, and other ways of belonging encapsulated the need to feel connected to others. Many of the participants envisaged working as a way of achieving this. Others had experienced work as isolating and excluding, and had found leaving or changing work roles to be liberating. Work values, personal values; the need for accord reflected the attitudes that participants held about the role of work in their lives, and in society. These views reflected ambivalent feelings about working which often seemed to stem from distressing experiences of work. The longitudinal nature of the study facilitated engagement with the developing narratives and exploration of the changes and consistencies in the participants’ meaning making about work. Conclusion - work may contribute to recovery, as can other forms of occupational engagement. Attention to identity building and fostering a sense of belonging is important. Implications relate to the need for service providers to utilise a flexible approach to occupational participation.
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Okello, Angoma Sunday. "Post-war social recovery in northern Uganda : grassroots perspectives and non-governmental organisations." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4340/.
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From mid-2006 to 2010 grassroots perspectives of Acholi people in Northern Uganda followed Non-Governmental Organisations’ roles in post-war social recovery. For over 20 years of war between the Lord’s Resistance Army and Uganda Government, displacement and home-returns, Acholi people relied on NGOs. This study explores how far NGOs can transform and rebuild social authority structure and support social reconciliation in Acholiland. Using a qualitative methodology, Acholi returnees’ views were triangulated with those of NGOs, Government officials and relevant actors following grassroots perceptions on roles NGOs played. From this study, NGOs play participatory political and social roles at grassroots level; fail to address the root causes of conflicts. The contentious NGO roles involve a separation of inflated expectations from what is achievable. Social realities of Acholi people are in theory and ideally over-ridden by practical NGOs’ levels, typologies, activities, budgets, policies and codes of conducts. NGOs played key roles in the interlocution and encouragement of a discourse for rebuilding Acholi lineage-based authority without middle-class elites that links grassroots population. With NGOs’ withdrawal from post-war reconstruction, Acholi remained in a weak social authority and loose social bonding with lesser meaning and reality of social reconciliation. With raised disappointments on NGOs, Acholi people are stuck between a rock and hard place in respective villages.
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Jenkinson, Julia. "Exploring recovery in women diagnosed with personality disorder in a secure setting." Thesis, Canterbury Christ Church University, 2011. http://create.canterbury.ac.uk/10341/.
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Section A consists of a literature review which explores the concept of recovery and its relevance for women who have been detained in a secure setting and diagnosed with a personality disorder. Section B presents the findings of a study to explore the concept of recovery in women diagnosed with personality disorder in a secure unit. Six semi- structured interviews, conducted with women diagnosed with personality disorder and experience of being detained in secure accommodation, were analysed using Interpretative Phenomenological Analysis. Analysis of the transcripts revealed five master themes: recovering; centrality of relationships; assuming responsibility for own care; evolving an identity; understanding of the mental health experience. The study concludes that, as far as is consistent with a secure setting, women should be given maximum opportunity to participate in decisions about their own care. Staff should be creative in providing opportunities for the women to engage in meaningful activities that promote a positive identity. Education with respect to personal recovery and the presentation and aetiology of personality disorder may support more caring and hopeful relationships between staff and service users, within which recovery can be facilitated. Section C involves a critical appraisal of the study.
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Borg, Marit. "The Nature of Recovery as Lived in Everyday Life: Perspectives of individuals recovering from severe mental health problems." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for sosialt arbeid og helsevitenskap, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1525.
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The aims of this dissertation have been to explore, understand, and hopefully contribute to improving the situations of people in recovery from severe mental health problems. A central focus has been the everyday personal experience of living with mental distress, and especially the struggles and strategies associated with overcoming daily challenges. My major concern has not been a deficit-based, disease and treatment approach, but rather about how problems and consequences of being diagnosed and treated for severe mental health problems affect peoples’ lives, especially looking at what can inform and guide the whole of society towards more hopeful, positive directions. I contend and will argue that an everyday life perspective is essential in this quest.
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Millar, Hayleigh. "Recovery approaches with women with a diagnosis of personality disorder in secure care." Thesis, Canterbury Christ Church University, 2011. http://create.canterbury.ac.uk/10263/.
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A literature review in Section A reviews the conceptual and empirical literature with regard to the usefulness and challenges inherent in applying recovery approaches in secure services, with a particular focus on women with a diagnosis of personality disorder. Section B. Background: Some studies have suggested that recovery approaches could be facilitated in secure mental health services despite a number of inherent tensions. However, none have explored if this applies to women with a diagnosis of personality disorder in secure care. A group whose needs have historically been overlooked, and can present with complex care-seeking behaviours. Aims. To explore how staff working with these women understand and apply recovery approaches in secure units. Method. Eleven multidisciplinary staff members working in a medium-secure unit in the UK participated in in-depth interviews. The data was analysed using grounded theory. Results. A preliminary model was generated, which comprised of five categories: secure base, balancing tensions, therapeutic relationship, initiating recovery, and nurturing recovery. These appeared to interact and influence each other throughout the recovery process. Conclusions. Staff are required to continually balance a number of tensions and as such they need a secure base from which to explore the service-users’ unique recovery process through the medium of collaborative therapeutic relationships. Staff sharing a recovery ethos that is embedded in the culture of a conducive environment, and is supported by supervision and teamwork, fosters the actualisation of recovery principles of empowerment, identity formation, and hope. Section C provides a critical appraisal of the study as well as a personal reflection on what was learnt through the process of the conducting the study.
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Svedberg, Johanna. "Andlighet och beroende : en intensivstudie om andlighetens betydelse för att bryta ett beroende och kvarstå i drogfrihet." Thesis, Stockholm University, Department of Social Work, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-681.
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Syftet med denna studie var att få en ökad kunskap och förståelse för betydelsen av andliga upplevelser för att kunna bryta ett beroende, samt vad andliga upplevelser betyder för att lyckas hålla sig drogfri. Den frågeställning som studien utgick ifrån var: Hur beskriver ett mindre urval av intervjupersoner sina erfarenheter av andliga upplevelser för att kunna bryta ett beroende, samt för att kunna kvarstå i drogfrihet? Datainsamlingen bestod av fyra djupintervjuer med personer med egna erfarenheter på området andlighet och beroende. Studien följde således en kvalitativ design och utgick från en hermeneutisk vetenskapsfilosofisk position. De viktigaste resultaten visade på att erfarenheten av andliga upplevelser hos intervjupersonerna har haft stor betydelse för att kunna bryta ett beroende samt att kunna kvarstå i drogfrihet. En slutsats som kan dras är att det är viktigt att beakta den andliga dimensionen vid beroendeproblematik. Studiens resultat ligger i linje med vad tidigare forskning visat.
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Seebohm, Patience. ""It's about liberation" : community development support for groups of black people with mental health problems." Thesis, Anglia Ruskin University, 2013. http://arro.anglia.ac.uk/305404/.
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Disproportionately high numbers of Black people use mental health services and experience involuntary treatment in the UK. There is no simple explanation, but research and policy suggest that groups run by and for Black people with mental health problems provide valued support. This study asks how community development (CD) practice can help these groups to develop and thrive. The research adopted an action research framework to develop four cycles of research, each informing the next, within a social constructivist paradigm. Methods were mainly qualitative: interviews, group discussions and observation, with a questionnaire survey in cycle one. This asked CD practitioners about their activities and helped to identify two groups for case studies in cycles two and three. During the case studies, groups received development support on their chosen topic while participating in qualitative research; activities were clearly demarcated. Reflective field notes added to the data. In the fourth cycle reflective conversations with eminent ‘critical friends’ refined and affirmed the learning. Thematic analysis was continuous and progressive. Findings suggest that CD practitioners can inspire and help Black people with mental health problems to come together in member-led, mutually supportive groups, justifying Black-only membership. Effective practitioners, especially Black role models, helped groups to generate self-belief and self-efficacy through collective action, enabling members to change their status, services and community. Those practitioners who demonstrated critical humility, commitment and competence broke the pattern of racial and psychiatric dominance. Others inadvertently reinforced societal oppression. A new concept is introduced to encapsulate the learning: the ‘liberation approach’ to CD which synthesises four perspectives: radical CD, mental health recovery, Black self-help and liberation theories. This approach helps groups to challenge oppressive processes, breaking the mould in which they feel constrained. The study contributes new theory, evidence and research methodology about CD and self-organising groups within this context.
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Seebohm, Patience. ""It's about liberation" Community development support for groups of black people with mental health problems." Thesis, Anglia Ruskin University, 2013. https://arro.anglia.ac.uk/id/eprint/305404/1/Seebohm%20thesis%20Aug%202013.pdf.
Full textAbstract:
Disproportionately high numbers of Black people use mental health services and experience involuntary treatment in the UK. There is no simple explanation, but research and policy suggest that groups run by and for Black people with mental health problems provide valued support. This study asks how community development (CD) practice can help these groups to develop and thrive.
The research adopted an action research framework to develop four cycles of research, each informing the next, within a social constructivist paradigm. Methods were mainly qualitative: interviews, group discussions and observation, with a questionnaire survey in cycle one. This asked CD practitioners about their activities and helped to identify two groups for case studies in cycles two and three. During the case studies, groups received development support on their chosen topic while participating in qualitative research; activities were clearly demarcated. Reflective field notes added to the data. In the fourth cycle reflective conversations with eminent ‘critical friends’ refined and affirmed the learning. Thematic analysis was continuous and progressive.
Findings suggest that CD practitioners can inspire and help Black people with mental health problems to come together in member-led, mutually supportive groups, justifying Black-only membership. Effective practitioners, especially Black role models, helped groups to generate self-belief and self-efficacy through collective action, enabling members to change their status, services and community. Those practitioners who demonstrated critical humility, commitment and competence broke the pattern of racial and psychiatric dominance. Others inadvertently reinforced societal oppression.
A new concept is introduced to encapsulate the learning: the ‘liberation approach’ to CD which synthesises four perspectives: radical CD, mental health recovery, Black self-help and liberation theories. This approach helps groups to challenge oppressive processes, breaking the mould in which they feel constrained. The study contributes new theory, evidence and research methodology about CD and self-organising groups within this context.
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Minsker, Stanislav. "Non-asymptotic bounds for prediction problems and density estimation." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44808.
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This dissertation investigates the learning scenarios where a high-dimensional parameter has to be estimated from a given sample of fixed size, often smaller than the dimension of the problem. The first part answers some open questions for the binary classification problem in the framework of active learning.
Given a random couple (X,Y) with unknown distribution P, the goal of binary classification is to predict a label Y based on the observation X. Prediction rule is constructed from a sequence of observations sampled from P. The concept of active learning can be informally characterized as follows: on every iteration, the algorithm is allowed to request a label Y for any instance X which it considers to be the most informative. The contribution of this work consists of two parts: first, we provide the minimax lower bounds for the performance of active learning methods. Second, we propose an active learning algorithm which attains nearly optimal rates over a broad class of underlying distributions and is adaptive with respect to the unknown parameters of the problem.
The second part of this thesis is related to sparse recovery in the framework of dictionary learning. Let (X,Y) be a random couple with unknown distribution P. Given a collection of functions H, the goal of dictionary learning is to construct a prediction rule for Y given by a linear combination of the elements of H. The problem is sparse if there exists a good prediction rule that depends on a small number of functions from H. We propose an estimator of the unknown optimal prediction rule based on penalized empirical risk minimization algorithm. We show that the proposed estimator is able to take advantage of the possible sparse structure of the problem by providing probabilistic bounds for its performance.
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Trischler, Johann. "Strategic raw material supply for the particleboard-producing industry in Europe : Problems and challenges." Doctoral thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-53700.
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Particleboard was invented to increase the utilization of wood and it soon became an important core material for furniture production. Nowadays, other industries such as the pulp and papermaking industry and the thermal energy recovery industry claim the same type of raw material. This leads to increasing competition and higher prices than in the past when that kind of wood raw material was widely available and of low price. The particleboard-producing industry is therefore seeking opportunities to reduce the competition and ensure the future supply of lignocellulosic raw material for their products. The purpose of the work summarised in this thesis was to investigate the strategic supply of lignocellulosic raw materials for particleboard production and to evaluate alternatives for the supply of lignocellulosic raw material for particleboard production. To encompass the complex field of strategic raw material supply, several publications have considered different stages along the supply chain. These papers range from empirical studies to practical tests on a laboratory scale. In this thesis, some of the papers are linked together, building the base for the overall results. The results show that the task of increasing the supply of lignocellulosic raw material as primary raw material source is limited by several factors, but that improved product design coupled with a suitable recycling concept can greatly increase the availability of lignocellulosic raw material as a secondary source. Alternatively, the use of non-wood plants might be an opportunity to substitute wood as raw material but there are still some problems relating to the particle properties which must be overcome first.
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Chacowry, Anoradha. "Community recovery and resilience building in the aftermath of flood hazards in the small island developing state of Mauritius." Thesis, University of Gloucestershire, 2014. http://eprints.glos.ac.uk/2491/.
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At the global level, a noticeable rise has been observed in the adverse impact of an increasing number of hazards, in particular floods, on society. This condition has brought into greater focus the issues of vulnerability, environmental justice and resilience in the recovery of community groups. In Mauritius, economic development, growth in population and intensive land use have resulted in greater human use-environment interaction with accompanying increase in flood conditions and the vulnerability of inhabitants exposed to flood risk. Traditional top-down hazard risk reduction strategies have not been very effective in reducing vulnerability or in promoting resilience of affected communities as they are often left to fend for themselves immediately after the emergency and relief stage of the recovery process. Using three case studies, this thesis explored the perception of the affected communities in building resilience to recover in the aftermath of flood hazards. Mixed methods of collecting and analysing data using both quantitative and qualitative approaches were used. They provided a comprehensive way of gathering information from households, agency stakeholders and secondary sources. The data were analysed and the results assessed through the lens of the overarching concept of community resilience that encompasses six types of resilience. This new approach provided a holistic perspective in exploring factors that influence the building of community resilience and the realisation of long-term recovery and rehabilitation. Findings from this study showed evidence of social inequity and environmental injustice mostly among the low income groups in all the three case studies. Evaluation of results revealed a number of factors that were gradually increasing their level of vulnerability and adversely impacting on their resilience. In order to achieve recovery and community resilience, the various types of resilience needed to be reinforced. It was found that social networking and a combination of local knowledge with that of experts, through community participation in decision making, were crucial in reinforcing community resilience. Based on the research findings, an integrated framework for disaster risk reduction management (IFDRRM) was developed. The framework could be applicable in defining policy options and implementation strategies in Mauritius and possibly in other Small Islands Developing States (SIDS) with similar challenges.
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Öberg, Christian. "Co-combustion of Industrial Biosludge and other Residual Streams in a Bubbling Fluidized Bed : Focusing on reduction of operating and technical problems by analyzing the ash transformation chemistry." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-122491.
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Today the use of resources in the industry are not complete to be considered as sustainable from the perspective of nutrient recovery. In the Swedish pulp and paper industry residual streams such as bark, fiber reject and sludge are returned for more sustainable use more frequently. Around 300 000-600 000 tons of sludge is generated every year from different cleaning processes in the pulp and paper industry. About 15 % of that sludge is so called biosludge that is a result from biological water treatment, where large amounts of phosphorus are used. After the cleaning process the total amount of biosludge generated in Sweden each year is estimated to contain approximately 2000 tons of phosphorus (P). The most common way to discard the biosludge today is by incineration, where aspects such as high content of moisture and ash have proven to be problematic. Besides phosphorus, other elements such as sulfur (S), chlorine (Cl) and calcium (Ca) are often found in the biosludge in larger amounts. This study included co-combustion experiments of current residual streams from the pulp and paper mill SCA Obbola AB where the aim was to investigate how the ash transformation chemistry was affected. The residual streams comprised of bark, fiber reject and biosludge which were combusted together with stem wood in a bench scaled bubbling fluidized bed. To investigate if different ash related operating and technical problems could be reduced and if there was potential of phosphorus recycling from the ashes, produced ash and other samples were examined by SEM/EDS. The fuel mix from SCA Obbola consisted of large amounts of Ca, S and P relative to more ordinary biomass fuels like stem wood. These elements originated from the biosludge and was confirmed by the fuel analysis. Analysis made on collected samples showed that Ca and P together formed phosphates that either stayed in the bed or was collected in the cyclone which indicated that there could be a potential for recovering phosphorus. Although, the Ca/P ratio in the ashes was too high, which probably leads to that phosphates unsuitable for nutrient recovery are formed. The fiber reject from SCA Obbola contained large amounts of chlorine according to the fuel analysis which was indicated from the results later in the study. During the combustion most of the Cl left the bottom ash via volatilization. It was true for both the fuel blends with and without fiber reject. When larger amounts of biosludge was added to the fuel mix less of the corrosive compound potassium chloride (KCl) was found in depositions and collected fine particulate matter (PM). This was due to that more sulfur was added in the system when the amount of biosludge was increased which lead to that K reacted with SO2 instead of Cl and formed K2SO4. The observed reduction of KCl resulted in; 1) lower amounts of fine particulate matter which means less loaded particulate filters 2) less risk of high temperature corrosion on heat transfer surfaces. The general conclusion that could be drawn from this study was that by increasing the amount of biosludge in the fuel blend at already high mixings of fiber reject, problems such as corrosion and fine particulate matter could be reduced. These advantages must be considered to the amount of lime stone needed to be added for reducing HCl from a cost perspective.
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Manley, David Steven. "What helps and what hinders recovery : narratives of service users and practitioners about dual diagnosis (co-existing mental health and substance misuse problems)." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/30662/.
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Prevalence rates for mental health problems amongst drug and alcohol service users in the UK were 74.5% and 85.5% respectively (Weaver et al 2003). 44% of people with psychiatric problems also had a substance misuse problem (Weaver 2003). Aims and objectives: This study aims to identify what service users with dual diagnosis and practitioners who work in this area perceive to be the factors that foster and inhibit their recovery (a meaningful quality of life). This is a narrative study using unstructured interviews to develop a framework for understanding the experiences of people who have a dual diagnosis and to guide those that help them. Methodology: Ten service users and ten practitioners were interviewed using a narrative approach. These were then transcribed and analysed using Langdridge’s (2012) Critical Narrative Analysis framework (CNA). Goffman’s, Link and Phelan’s and Sayce’s theories on stigma and Frank’s discussion of the role of narrative storytelling in illness were used as hermeneutics of suspicion to study meaning within the narratives. Findings: The study explores how four key themes Stigma, Motivation, Recovery and Tension narratives provide an explanatory framework of recovery and identity for both service users and practitioners. It uncovers the interrelationships between the spoiled identities (double jeopardy) of service users and the influence this stigma has on practitioners. The study develops a perspective of how narrative storytelling can help articulate and reframe identities to aid recovery amongst people with a Dual Diagnosis. Relevance: There have been very few studies that explore the lived experience of people with a Dual Diagnosis or the practitioners who work with them. Meta analyses of randomised controlled trials in Dual Diagnosis have found little conclusive evidence of interventions that are effective. The study suggests that in pursuing empiricist research standards, previous studies have missed the holism provided by seeing individual experience as an important factor in affecting the course and effect on people who experience Dual Diagnosis and those around them who try to help.
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Olajubutu, Michael Olaolu. "Utilizing microprocessor based relays as predictive tools to mitigate voltage instability problems that stem from the fast voltage collapse and delayed voltage recovery phenomena." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/OLAJUBUTU_MICHAEL_35.pdf.
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Suprina, Joffrey Scott. "Using Life-Style and Coping Resources to Differentiate Between Gay Men With and Without Alcohol Problems: An Adlerian Study." unrestricted, 2006. http://etd.gsu.edu/theses/available/etd-06292006-153529/.
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Thesis (Ph. D.)--Georgia State University, 2006.Title from title screen. Catherine Y. Chang, committee chair; Kenneth B. Matheny, Roy M. Kern, Catherine J. Brack, Brain J. Dew, committee members. Electronic text (74 p.) : digital, PDF file. Description based on contents viewed May 29, 2007. Includes bibliographical references (p. 66-74).
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Morris, Graham Peter. "Parameter recovery in AC solution-phase voltammetry and a consideration of some issues arising when applied to surface-confined reactions." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:1b1d40f3-ef1a-4f64-b500-17ce34630c43.
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A major problem in the quantitative analysis of AC voltammetric data has been the variance in results between laboratories, often resulting from a reliance on "heuristic" methods of parameter estimation that are strongly dependent on the choices of the operator. In this thesis, an automatic method for parameter estimation will be tested in the context of experiments involving electron-transfer processes in solution-phase. It will be shown that this automatic method produces parameter estimates consistent with those from other methods and the literature in the case of the ferri-/ferrocyanide couple, and is able to explain inconsistency in published values of the rate parameter for the ferrocene/ferrocenium couple. When a coupled homogeneous reaction is considered in a theoretical study, parameter recovery is achieved with a higher degree of accuracy when simulated data resulting from a high frequency AC voltammetry waveform are used. When surface-confined reactions are considered, heterogeneity in the rate constant and formal potential make parameter estimation more challenging. In the final study, a method for incorporating these "dispersion" effects into voltammetric simulations is presented, and for the first time, a quantitive theoretical study of the impact of dispersion on measured current is undertaken.
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Haptén, Oscar, and Love Severin. "Återhämtning från alkohol och drogproblem : - en fenomenologisk studie av fyra människors återhämtningsprocesser." Thesis, Stockholms universitet, Institutionen för socialt arbete - Socialhögskolan, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-72372.
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The aim of this study is to increase understanding about addiction recovery. More specifically, we want to know what people who have had problems with alcohol and/or other drugs perceive as helpful and important for their recovery process and how we can understand this process. The study was conducted by means of qualitative semi-structured interviews with four people who have had alcohol and/or other drug problems. The analysis is based on a transtheoretical model of change from addictive behaviours, coping, interactionist theories and also a recovery perspective, inspired by research on recovery from mental illness . Main findings are that recovery from addiction can be understood as an individual process that takes place in a social context and can follow expected phases, although there are large individual differences in the process. Through the recovery process it has been of importance to the participants in the study to redefine themselves and their problems, get support from others, find ways to cope with their problems, get involved in meaningful activities and to expand their social roles. Internal and external processes that are not directly related to drug use also appear to be important for the recovery from addiction.
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Andersson, Jonas, and Torkel Liljekvist. "Ambulanspersonalens upplevelser av återhämtning mellan uppdragen." Thesis, Umeå universitet, Institutionen för omvårdnad, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-99940.
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Bakgrund: Personal inom ambulanssjukvård utsätts dagligen för stress och hög arbetsbe- lastning. Detta leder till ökad risk för hälsoproblem hos ambulanspersonal och riskerar att kunna påverka omvårdnaden.
Syfte: Syftet med studien var att belysa ambulanspersonalens upplevelser av återhämt- ning mellan uppdragen.
Deltagare: I studien medverkade tio anställda inom ambulanssjukvården vid två medel- stora städer i Sverige och närliggande glesbygd.
Metod: Studien baserades på tio semistrukturerade intervjuer utförda december 2014. In- tervjuerna spelades in och analyserades med kvalitativ innehållsanalys.
Resultat: Fyra kategorier framkom: Förutsättningar för återhämtning, Omständigheter som ger återhämtning, Omständigheter som motverkar återhämtning och Konsekvenser av bristande återhämtning. Till de fyra kategorierna skapades 14 underkategorier. De fak- torer som bedömdes som viktigast för god återhämtning var dagtid måltider och social umgänge. Under nattetid har sömn beskrivits som mest elementärt. Det påpekades att det är svårt att planera för vila och återhämtning dels pga arbetsbelastningen, dels pga oviss- heten om arbetspassets fortskridande.
Slutsats: Resultatet av studien visar att ambulanspersonal upplever att den viktigaste återhämtningen sker genom sömn, måltider och socialt umgänge. Förutsättningar för vila och återhämtning har en fundamental roll. Det som kan försämra återhämtning upplevs vara; brist på adekvat krishantering, kort tid för återhämtning samt dåligt kollegialt stöd, vilket kan leda till försämrad omvårdnad och risk för negativa hälsoeffekter.Background: Ambulance personnel face daily stress and high workload. This leads to increased risk of health problems among ambulance personnel and risk to affect care. Purpose: The purpose of this study was to elucidate the ambulance personnel experiences of recovery between missions. Participants: In the study contributed ten employees in prehospital care at two mid-sized cities in Sweden and surrounding rural areas. Method: The study was based on ten semi-structured interviews conducted in December 2014. The interviews were recorded and analyzed using qualitative content analysis. Results: Four categories emerged: Prerequisites for recovery, Circumstances that provides recovery, Circumstances that impairs recovery and Consequences of lack of recovery. To the four categories 14 subcategories were created. The factors that were considered most important for good recovery is daytime, meals and social interaction. During nighttime sleep was described as the most elementary. It was pointed out that it is difficult to plan for rest and recovery, partly because the workload, partly because of uncertainty about the workshifts progression. Conclusion: The result of the study shows that ambulance personnel feel that the most important recovery occurs through sleep, meals and socializing. Prerequisites for rest and recovery has a fundamental role. What may limit the recovery is perceived to be; lack of adequate crisis management, short time for recovery and poor peer support. Which can lead to impaired care and risk of adverse health effects.
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Knuts, Caroline, and Linnea Lundvall. "Att möta klienter med samsjuklighet : Socialarbetares upplevelser av arbetet med klienter som har en samsjuklighet i form av psykisk ohälsa och beroendeproblematik." Thesis, Högskolan Dalarna, Institutionen för hälsa och välfärd, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:du-36438.
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Samsjuklighet i form av psykisk ohälsa och beroendeproblematik är idag ett vanligt fenomen som socialarbetare kan ställas inför i mötet med klienter, vilket kan medföra en hel del utmaningar. Syftet med studien var att få en djupare förståelse för hur professionella socialarbetare upplever arbetet med klienter som har en samsjuklighet. Studien grundade sig i kvalitativa semistrukturerade intervjuer som sedan analyserades med hjälp av tematisk analys. Resultatet diskuterades utifrån tidigare forskning och teorierna stigma och återhämtning. Studiens resultat visade att arbetet med samsjuklighet är komplext, att det krävs en nära samverkan för att klienterna ska få rätt hjälp och att målgruppen många gånger riskerar att bli diskriminerade på grund av stigma. Slutsatserna var således att svårigheterna kring målgruppen påverkar varandra. Målgruppens stigmatiserade ställning i samhället kan exempelvis försvåra samverkan och göra det svårare att få en helhetssyn, vilket i sin tur kan påverka klientens återhämtning.Comorbidity in the form of mental illness and addiction problems is today a common phenomenon that social workers can face in meeting clients, which can entail a lot of challenges. The purpose of the study was to gain a deeper understanding of how professional social workers experience working with clients who have a comorbidity. The study was based on qualitative semi-structured interviews which were then analyzed using thematic analysis. The results were discussed based on previous research and the theories of stigma and recovery. The results of the study showed that the work with comorbidity is complex, that close collaboration is required for the clients to receive the right help and that the target group often risks being discriminated against due to stigma. The conclusions were thus that the difficulties around the target group affect each other. The target group's stigmatized position in society can, for example, complicate collaboration and make it more difficult to gain a holistic view, which in turn can affect the client's recovery.
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Clarke, Michael D. D. (Michael Dudley Delano). "An introduction to the airline recovery problem." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10506.
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Zinner, Martin. "Ausfalldetektoren und das Consensus-Problem im Crash-Recovery-Modell." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=981232442.
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Velona, Vasiliki. "A study on structure recovery and the broadcasting problem." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672697.
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The thesis contains a study of two problems of combinatorial statistics. The first one is structure learning for partial correlation graphs and the second one is the broadcasting problem on certain families of random recursive trees. In a precise language, the structure recovery problem that we study is the following: given access to individual entries of a covariance matrix S, learn the support of the inverse of S (let us denote this matrix by K) using only a small fraction of S. We call this problem ‘structure recovery’ since the zero-entries of K define the adjacency matrix of a graph (called partial correlation graph). As an example of why this is an important graph to learn, consider that S corresponds to a Gaussian random vector (X1, ..., Xn). Then an entry sij is zero if and only if Xi and Xj are independent given the rest of the random variables. A series of algorithms is proposed to address the aforementioned question, assuming that our graphs satisfy certain sparsity conditions. The sparsity that is assumed is related to how much our graph resembles a tree; in particular we deal with trees, graphs of small 2 connected components, and graphs of small treewidth. The proposed algorithms can also be used to estimate K and not only learn the partial correlation graph. Moreover, they can be used to invert any symmetric positive definite matrix since the analysis can be detached from its statistical connection and impact.The motivation for the use of covariance entries is that S might be too large to even store, as it often happens in statistical settings. In fact, our goal is to learn the partial correlation graph using sub-quadratic number of queries, since quadratic time is needed just to write down and store the covariance matrix – this is the starting point for a big part of the literature. The desired complexity bounds are achieved through our analysis.
Moving to the second problem under study, we consider a broadcasting process on a graph to be the propagation of a message (let us say a bit value in {0, 1}) from one node to all the rest, possibly corrupted. Our goal is to guess the initial message. We consider that our graph is a tree and is created dynamically in times 0, 1..., n, in a way that at time i the i-th vertex enters the system and attaches with an edge to an existing vertex j (we then write i ~ j). We are interested in the case where i attaches uniformly at random to an existing vertex (uniform attachment) or where i attaches to a vertex with probability proportional to the outdegree of an existing vertex, plus some parameter ß > 0. The broadcasting process we consider is one where vertex 0 (the root) has a bit value that is propagated correctly to its neighbours with probability 1 - q and incorrectly with probability q. The broadcasting problem under study can be formulated in this way: given access to a random tree produced by either uniform attachment or preferential attachment and the bit values of the vertices, but without observing the time labels of the vertices, recover the bit of vertex zero. In a more difficult variant, we answer the same question given only the bits of vertices with outdegree zero (the leaves). In both variants of the problem in both models, we characterize the values of q for which the optimal reconstruction method has a probability of error bounded away from 1/2. We also show that the probability of error is bounded by a constant times q. Two simple reconstruction rules are analyzed in detail. One of them is the simple majority vote, the other is the bit value of the centroid of the tree (or the closest leaf to the centroid). We also analyze a third reconstruction rule which is more complex but works for all q where reconstruction is theoretically possible.Aquesta tesi estudia dos problemes d'estadística combinatòria: l'aprenentatge d'estructura per a grafs de correlació parcial, i el problema de difusió en famílies d'arbres recursius aleatoris. En el primer cas, el problema de recuperació de l'estructura que estudiem és el següent: donat l'accés a les entrades individuals d'una matriu de covariància A, aprenem el suport de la inversa de S. (denotem aquesta matriu per K) utilitzant només una petita fracció de la matriu S. Anomenem aquest problema «de recuperació d'estructures», ja que les entrades nul·les de K defineixen la matriu d'adjacència d'un graf (anomenat graf de correlació parcial). Com a exemple del perquè aquest és un graf rellevant, considereu que S s'associa a un vector aleatori gaussià (X1, ..., Xn). Llavors una entrada sij és zero si i només si Xi i Xj són independents. Proposem una sèrie d'algorismes per estudiar la pregunta esmentada, assumint que els nostres grafs satisfan certes condicions de densitat. La densitat que s'assumeix està relacionada amb quant s'assembla el nostre graf a un arbre; en particular, tractem amb arbres, grafs amb components connexes suficientment petites, i grafs de petita amplada d'arbre. Els algorismes proposats també es poden utilitzar per estimar S i no només per aprendre el graf de correlació parcial. Finalment, les tècniques també es poden utilitzar per invertir qualsevol matriu simètrica definida positiva, ja que l'estudi es pot separar de la seva connexió estadística. La motivació per a l'ús d'entrades de covariància és que S pot ser massa gran per emmagatzemar-la, com passa sovint en configuracions estadístiques. De fet, el nostre objectiu és aprendre el graf de correlació parcial utilitzant el nombre subquadràtic de consultes, ja que el temps quadràtic és necessari només per a escriure i emmagatzemar la matriu de covariància: aquest és el punt de partida per a una gran part de la literatura. Els límits de complexitat desitjats s'aconsegueixen a través de la nostra anàlisi. En quant al segon problema, considerem que un procés de radiodifusió sobre un graf és la propagació d'un missatge (diguem un valor de bit a {0,1}) d'un node a tota la resta, possiblement corromput. El nostre objectiu és esbrinar el missatge inicial. Considerem que el nostre graf és un arbre i es crea dinàmicament en temps 0, 1, ..., n, de tal forma que en el temps i el vèrtex i-èssim entra al sistema i s'uneix amb una aresta a un vèrtex j existent (escrivim i~j). Estem interessats en el cas en què i s'adhereixi uniformement a l'atzar a un vèrtex existent (adjunt uniforme) o on s'hi connecti a un vèrtex amb probabilitat proporcional al grau de sortida d'un vèrtex existent, més algun paràmetre ß > 0. El procés de radiodifusió que considerem és un en què el vèrtex 0 (l'arrel) té un valor de bits que es propaga correctament als seus veïns amb probabilitat 1-q i incorrectament amb probabilitat q. El problema de la radiodifusió es pot formular d'aquesta manera: donat l'accés a un arbre aleatori produït per un adjunció uniforme, o per adjunció preferencial i els valors de bits dels vèrtexs, però sense observar les etiquetes de temps dels vèrtexs, recupereu el bit del vèrtex zero. En una variant més difícil, també es pretén estudiar-lo donat només els bits dels vèrtexs amb grau de sobre zero (les fulles). En les dues variants del problema, caracteritzem els valors de q per als quals el mètode de reconstrucció òptim té una probabilitat d'error limitat a 1/2. També demostrem que la probabilitat d'error està limitada per un múltiple constant de q. S'analitzen detalladament dues regles de reconstrucció senzilles: una d'elles és el vot per majoria simple, l'altre és el valor de bit del centroide de l'arbre (o la fulla més propera al centroide). També analitzem una tercera regla de reconstrucció que és més complexa, però funciona en casos més generals de la tria de q.
Matemàtica aplicada
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Mahdavian, Farnaz [Verfasser], and F. [Akademischer Betreuer] Schultmann. "Emergency Decision Making and Disaster Recovery / Farnaz Mahdavian ; Betreuer: F. Schultmann." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1229514724/34.
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Thengvall, Benjamin Glover. "Models and solution techniques for the aircraft schedule recovery problem /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
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Pickering, Dylan. "Conceptualisation and Measurement of Recovery in Gambling Disorder." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/21188.
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Recovery is a diffuse concept that is poorly and inconsistently defined in the gambling literature. There are no established operational criteria for recovery from gambling disorder, thus making it difficult to make cross-study comparisons and determine treatment efficacy. This thesis aimed to increase understanding of recovery in gambling disorder by developing and validating a self-report instrument for the measurement of gambling recovery. Chapters 1 and 2 contain a review of the literature on theoretical models relevant to recovery, and measurement of treatment outcomes in gambling disorder. Findings were used to specify the conceptual boundaries of gambling recovery based on researchers’ previous attempts to define and measure this construct. In Chapter 3, a series of qualitative interviews were conducted with gamblers accessing formal help services to better understand their conceptualisations of recovery. In Chapter 4, an integrated construct definition and an initial pool of questionnaire items were developed. In Chapter 5, draft items were subjected to review and refinement via expert feedback and cognitive pretesting. Psychometric evaluation of the recovery instrument in a larger sample of gambling treatment service users is detailed in Chapter 6. This analysis resulted in a 32-item solution across six recovery dimensions: gambling reduction, urge coping, recovery wisdom, life functioning, interpersonal relationships, and mental health. The recovery index for gambling disorder (RIGD) demonstrated good construct validity and test-retest reliability. The RIGD is the first instrument specifically designed to measure recovery in the gambling literature. Valid measurement of recovery is particularly important given the central role of this construct in shaping mental health service policy internationally.
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Davidson, Duncan. "Social problem solving, cognitive defusion and social identification in wellness recovery action planning." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33141.
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Objective: The concept of recovery has become an integral part of modern mental health care. Understanding the outcomes and underlying mechanisms of key recovery interventions, such as Wellness Recovery Action Planning (WRAP), is essential in order to expand the theoretical understanding of recovery and inform how to target recovery in treatment. Therefore a systematic review of the literature was conducted to evaluate the mental health outcomes of WRAP for adults. The empirical study then explored three constructs in relation to WRAP and recovery. These were social problem solving, cognitive defusion and social identification. Method: The systematic review of the mental health outcomes of WRAP was conducted by searching four databases, contacting the authors of WRAP research and seeking evaluative information from organisations that deliver WRAP. Fourteen relevant studies met the inclusion criteria. Whereas, the empirical study recruited participants on a trans-diagnostic basis from across Scotland. Using a quantitative cross sectional design, 109 participant's completed 5 self-report questionnaires. These were the Knowledge, Attitudes and Beliefs about WRAP Questionnaire (WRAP beliefs), the Recovery Assessment Scale - Short (RAS-S), the Social Problem Solving Inventory - Revised - Short (SPSI-R-S), the Four Item Measure of Social Identification (FISI) and the Cognitive Fusion Questionnaire (CFQ). Correlation, regression and mediation analysis were used to explore relationships, and in particular, the predictors and mediators of recovery. Results: The systematic review provided strong evidence that WRAP has a significant positive impact on hope and also reduces the symptoms of mental illness. However, whether WRAP improves personal levels of recovery was unclear and a possible risk of disempowerment was found. Promising preliminary mental health outcomes in the areas of confidence in managing mental health, quality of life, service use, self-advocacy and knowledge attitudes and beliefs about recovery were highlighted. Only studies that did not use peer facilitators failed to find significant increases in hope compared to treatment as usual control groups. In the empirical study, the results indicated that all the constructs examined were correlated to recovery. In the regression analysis, WRAP beliefs, social problem solving and cognitive defusion also demonstrated a predictive relationship with recovery. Mediation analysis indicated that, social problem solving mediated two distinct relationships. One between WRAP beliefs and recovery, and another between cognitive defusion and recovery. The social problem solving subscales also showed how the two predictors relate to recovery through social problem solving in different ways. Social identification with the WRAP group did not significantly predict or mediate recovery. Conclusions: The systematic review indicated having peer facilitators delivering WRAP is key to helping participants foster hope and that a further randomised control trial could help clarify if improved personal recovery is an outcome of WRAP. It additionally suggested how the relationship between WRAP beliefs and recovery could be explored, as per the design of the empirical study. Findings from the empirical study implied that improving participants' social problem solving and cognitive defusion should be specifically targeted in WRAP delivery. The studies combined indicate that to achieve the best recovery results interventions, like WRAP, should target inspiring hope through peer support, improving knowledge, attitudes and beliefs about recovery and cognitive defusion from unhelpful thoughts.
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Yetere, Ayca. "Part Selection Problem In Disassembly Systems." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607099/index.pdf.
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In this study, we consider the disassembly problem of end-of-life (EOL) products for recovering valuable parts or assemblies. All parts obtained by disassembly processes of an EOL product may not be profitable due to their high recovery
costs. Our problem is to select the parts to be released and determine the associated disassembly tasks so as to maximize the total profit. We first tackle the simple part selection problem, and then introduce a time constraint for the tasks to be performed for selected parts and search for incomplete time constrained sequences. We formulate our first problem as a Mixed Integer Problem and show that the constraint set of this formulation is totally unimodular. We also provide the dual formulation of our problem and its interpretation. For time-constrained part selection problem we propose a branch-and-bound algorithm. We first develop some reduction mechanism to reduce the size of the problem. Our solution
procedure is capable of solving problems with up to 94 parts and tasks.
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Dias, Glend Kleiser Gouveia. "Uma proposta de solução para o aircraft recovery problem de companhias aéreas regulares de pequeno porte." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/8151.
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The airlines that operate regular ights de ne in advance the airports to be operated and the landing and takeo schedule of its aircraft. This scheduling is likely to su er interruptions causing nancial losses due to delays and/or cancellations of ights. In these situations, the airlines usually use the experience of their professionals and seek to minimize the impacts by relocating the aircraft, crew and then passengers. There is no guarantee that such method will lead to good results from an economic point of view, especially in periods of high demands of passengers. Due to this di culty, several authors have studied the Airline Recovery Problem using di erent optimization techniques. This problem is basically composed of three sub-problems: Aircraft Recovery Problem (ARP), Crew Recovery Problem (CRP) and Passenger Recovery Problem (PRP). In order to de- ne the new least-cost aircraft scheduling of a Brazilian airline (in operation interruption situations) due to delays and/or cancellations of ights, this research presents an ARP solution proposal starting from the representation of ights through a network time-space and mathematical modeling analogous to the minimum cost ow problem. To analyze the ARP, data was used from a Brazilian airline for building the time-space networks with bands of 30, 20 and 15 minutes, and 100 instances were utilized to simulate the unavailability of up to 3 aircraft on di erent nodes of such networks. The solutions based on these bands were solved via Integer Linear Programming and with average improvements of 38.24%, 40.44% and 41.15%, respectively, with respect to the trivial solutions. The band of 15 min was more appropriate because it provided a more realistic analysis of takeo s and landings events and resulted in a greater di erence, on average, between the optimal solutions and the trivial ones. Other 95 instances were tested for a time-space network with 15 min band and a spare aircraft located at the busiest airport. In this case the results were 38.68% better than the situation without a spare aircraft, but it was not conclusive because an economic feasibility analysis on the acquisition and deployment of a new aircraft in the eet must be performed.
As companhias a ereas de voos regulares possuem previamente de nidos os aeroportos que ser~ao operados, os dias e os hor arios de pouso e decolagem das suas aeronaves. E poss vel que essa programa c~ao sofra interrup c~oes e causem preju zos nanceiros devido aos atrasos e/ou cancelamentos dos voos. Nessas situa c~oes, normalmente as companhias a ereas usam a experi^encia dos seus pro ssionais e procuram minimizar os impactos realocando as aeronaves, tripulantes e em seguida os passageiros. N~ao h a garantia que esse m etodo retorne um bom resultado do ponto de vista econ^omico, sobretudo em per odos de grande demanda por passageiros. Mediante essa di culdade, diversos autores t^em estudado o Airline Recovery Problem empregando diferentes t ecnicas de otimiza c~ao. Esse problema e composto basicamente por tr^es subproblemas: Aircraft Recovery Problem (ARP), Crew Recovery Problem (CRP) e Passenger Recovery Problem (PRP). Como forma de de nir o novo sequenciamento das aeronaves de uma companhia a erea brasileira que, em situa c~oes de interrup c~oes das opera c~oes, resulte no menor custo devido aos atrasos e/ou cancelamentos dos voos, esta pesquisa apresenta uma proposta de solu c~ao do ARP a partir da representa c~ao dos voos por uma rede tempo-espa co e modelagem matem atica an aloga ao problema do uxo de custo m nimo. Para a an alise do ARP, foram utilizados dados de uma companhia a erea brasileira para a constru c~ao das redes tempo-espa co com bandas de 30, 20 e 15 minutos e empregadas 100 inst^ancias que simularam a indisponibilidade de at e 3 aeronaves em diferentes n os dessas redes. As solu c~oes baseadas nessas bandas foram resolvidas via Programa c~ao Linear Inteira e apresentaram resultados m edios, respectivamente, 38; 24%; 40; 44% e 41; 15% melhores do que as solu c~oes triviais. A banda de 15 min mostrou-se mais adequada porque possibilitou uma an alise mais realista dos eventos de pousos e decolagens e resultou numa diferen ca m edia maior entre as solu c~oes otimas e as triviais. Outras 95 inst^ancias foram testadas para uma rede tempo-espa co com banda de 15 min e aeronave reserva localizada no aeroporto de maior movimento. O resultado foi 38; 68% melhor do que a situa c~ao sem aeronave reserva, mas n~ao conclusivo por ser necess aria uma an alise de viabilidade econ^omica sobre a aquisi c~ao e disponibiliza c~ao de uma nova aeronave na frota.
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Dabrišiūtė, Kristina. "Nuostolių, kilusių dėl akcijų pirkimo-pardavimo sutartyse numatytų patvirtinimų ir garantijų pažeidimo, nustatymo ir išieškojimo problemos." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20110709_152129-34840.
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Šiame magistro darbe, pasitelkiant analizės, lyginamąjį, loginį, sisteminį ir ekonominį tyrimo metodus, išsamiai analizuojama nuostolių, kilusių dėl akcijų pirkimo–pardavimo sutartyse numatytų patvirtinimų ir garantijų pažeidimo, nustatymo ir išieškojimo problematika. Darbe tiek teoriniu, tiek praktiniu aspektu pateikiamos pagrindinės problemos ir siūlomi jų sprendimo variantai, kurie palengvintų nuostolių apskaičiavimą ir užtikrintų teisingą jų atlyginimą paaiškėjus, jog pardavėjo patvirtinimai ir garantijos, perleidžiant verslą akcijų pirkimo–pardavimo būdu, buvo klaidingi. Siekiant užsibrėžtų tikslų pirmoje darbo dalyje nagrinėjami verslo perleidimo akcijų pirkimo–pardavimo būdu ypatumai, aiškinamasi, kokį akcijų kiekį perleidus bus laikoma, kad įvyko viso verslo perleidimas, taip pat lyginamos sandorių rūšys verslą perleidžiant akcijų ir turto pardavimo būdais. Atsižvelgiant į tai, kad patvirtinimai ir garantijos jau tapo neatsiejama akcijų pirkimo–pardavimo sutarties nuostatų dalimi, o verslo įsigijimų praktikoje ginčai dažniausiai kyla dėl šių sutarties nuostatų pažeidimo, antroje darbo dalyje gilinamasi į jų teisinę prigimtį, esmę, tikslus bei vietą Lietuvos sutarčių teisės sistemoje. Pagrindinė darbo dalis skirta nagrinėjamos temos kontekste identifikuoti nuostolių nustatymo ir išieškojimo problemas, analizuoti pagrindinius nuostolių apskaičiavimo būdus ir įmonės vertinimo problematiką, įvertinti pardavėjo pareigos atskleisti informaciją ir pirkėjo pareigos patikrinti... [toliau žr. visą tekstą]This master thesis, through the use of analytical, comparative, logical, systemic and economic methods forms a thorough analysis of problems concerning estimation and recovery of losses caused by the breaches of representations and warranties provided for in share sale–purchase agreements. This paper in both – theoretical and practical standpoints presents the core of the pending problems while suggesting the eventual rules, which if addressed, could ease the estimation of losses and safeguard the fair-minded compensation in the situations when seller’s representations and warranties provided for in share sale–purchase agreements were false. In order to achieve the selected goals of this master thesis, the first part of the paper analyses peculiarities of business transfer through the purchase of shares. It also examines what amount of transferred shares can be considered as a transfer of full business as well as compares the nature of business transactions through the sale of shares and assets. Due to the fact that representations and warranties have become an integral part of share sale–purchase agreements and disputes in business acquisitions are most often caused by the breach of above clauses, the second part of the paper examines their legal nature, substance, goals and place in the Lithuanian law of contracts. The main part of the paper aims to identify problems in estimation and recovery of damages, analyze main methods of the calculation of damages and issues in... [to full text]
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Bernal, Stoopen Jose Francisco. "Binational collaboration in recovery of endangered species: the Mexican wolf as a case study." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/43.
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The goal of this inductive study was to identify factors that facilitate and inhibit binational collaboration in the recovery of endangered species in the northern Mexico borderlands, focusing on the Mexican wolf (Canis lupus baileyi). A conceptual model was developed using qualitative techniques, providing the basis for design of a mail survey. The target population included participants with experience in recovery efforts for over a dozen species at risk in the region. Long interviews were recorded with 44 participants from Mexico and the United States. Thematic hierarchical analysis was used to develop a conceptual model of how interviewees talked about factors influencing binational collaboration. Issues were classified in five thematic clusters: project, organization, people, resources, culture/history. The survey was used to conduct a needs assessment, measuring respondents' attitudes about the relative priority of issues identified in the conceptual model. High priority needs were identified from each thematic cluster: (a) equitable participation in project design and implementation, (b) continuity of personnel, (c) coordination of federal, state and local efforts, (d) increased funding, managed with accountability, and (e) exchange visits to facilitate understanding of diverse perspectives. Responses to almost half the survey items indicated accord among the sample of respondents, providing a basis for shared common ground. The nature of discord was within the range of "manageable", with no clear polarization of attitudes measured. This exploratory data analysis suggested that the structure of the conceptual model developed from the Mexican wolf case study was generally a valid basis for future deductive analysis and reflection by practitioners. For 82% of 22 statements of need, priorities of participants in the Mexican wolf recovery efforts did not differ significantly from other respondents. Nationality (of respondents) significantly affected priority rankings for only 18% of the need statements. Significant effects of five demographic variables indicated that interactive effects should be examined in future multivariate analyses to determine how respondents' attitudes on issues related to priority rankings. Recommendations were provided for a more efficient and effective approach to collaborative problem-solving, engaging reflective practitioners from the private and public sectors in principled negotiation processes to better understand diverse perspectives.