Up to 70 percent of rough mill manufacturing expenses stem from raw material (lumber) cost. Rough mill costs can be reduced by optimizing the lumber grade or grades that are purchased. This solution is known as the least-cost lumber grade-mix solution. The least-cost lumber grade-mix solutions has been a topic of great interest to both the secondary hardwood industry and to academia since even small changes in raw material cost can contribute to substantial reduction in rough mill expenses. A statistical model was developed for finding the least-cost lumber grade-mix which uses the rough mill simulator, ROMI-RIP 2.0, and the statistical package, SAS 8.2. The SAS 8.2-based least-cost lumber grade-mix model was validated by comparing SAS 8.2-based least-cost grade-mix solutions to OPTIGRAMI 2.0, a least-cost lumber grade-mix solver that relies on linear modeling. The SAS 8.2-based least-cost lumber grade-mix solver found lower cost solutions in 9 of 10 cutting bills that were tested. The SAS 8.2-based least-cost lumber grade-mix solver was packaged with ROMI 3.0, an updated version of ROMI-RIP, and provided to industry free of charge by the USDA Forest Service. The USDA Forest Service also purchased a SAS server license to allow least-cost lumber grade-mix solver users free access to SAS 8.2. However, industry users were reluctant to use the USDA Forest Service SAS server since it requires the user to enter individual cost and yield data to a government computer. This solution also required the user to have internet access and limited access to one user at any time. Thus, the goal of this research was to incorporate the least-cost lumber grade-mix solver into ROMI using the free, open source statistical package R 2.7.2. An R 2.7.2-based least-cost lumber grade-mix solver was developed and validated by comparing the R 2.7.2-based least-cost lumber grade-mix solutions to the updated SAS 9.2-based least-cost lumber grade-mix solutions. No differences were found in the least-cost lumber grade-mix solutions from either solver. Thus, a new least-cost lumber grade-mix solver using the R 2.7.2 open source statistical package was created. R 2.7.2 is installed on each personal computer on which the USDA Forest Service's ROMI rough mill simulation software is installed and, thus, no external computing resources are needed when solving the least-cost lumber grade-mix problem. / Master of Science

Yes / Performance evaluation has been an important topic of concern for tourism industry practitioners as well as academic researchers, and its investigation in the UK hotel sector is paramount because this industry has been experiencing a higher level of competition. The present study contributes to the previous literature on hotel performance evaluation in general by proposing an innovative hybrid method combining the second-order cone programming (SOCP) method and multi-criteria decision-making (MCDM) method to estimate the performance of the UK hotel sector. The innovation lies in the synergistic combination of SOCP and MCDM methodologies, enabling a comprehensive assessment of hotel performance by managing a non-linear optimisation. Overall, this hybrid method benefits from the ability to be more flexible in addressing complex operational issues and provide more accurate results. This research provides a cost-benefit analysis within the proposed method, suggesting important policy implications in the tourism industry. / The full-text of this article will be released for public view at the end of the publisher embargo on 30 Aug 2026.

Denna studie syftar till att undersöka hur elever i årskurs 1 på gymnasiet uppfattar att de, inom ramen för kursen Samhällskunskap 1b, kan använda en samhällsvetenskaplig analysmodell för att analysera ett samhällsproblem. Studien utgår från två forskningsfrågor: Hur uppfattar elever på gymnasiets högskoleförberedande program att de ska använda analysmodellen? Vilka olika kvaliteter kan skilja mellan en utvecklad och en mindre utvecklad uppfattning av hur analysmodellen ska användas? Undersökningen tar sin utgångspunkt i en yrkeserfarenhet av att elever ofta undrar hur de ska bli bättre på att analysera. Metoden som använts är att 50 elever besvarat en analysuppgift som syftade till att analysera varför ungdomar inte engagerar sig i det formella, demokratiska arbetet. Till hjälp att utreda frågan hade elevgruppen tillgång till analysmodell och källmaterial från den senaste demokratiutredningen, Låt fler forma framtiden! De svar som samlades in analyserades med en fenomenografisk metod, som syftar till att kategorisera olika uppfattningar som undersökningsgruppen har kring hur analysmodellen ska användas. Resultatet, utfallsrummet, är 6 beskrivningskategorier som skiljer sig avseende hur analysmodellen behandlas, strukturell aspekt, och i vad som behandlas i svaret, referentiell aspekt. Den mest avancerade hanteringen av analysmodellen ser dess delar som en helhet och som en struktur, samt väver in material från källor som stöd för sin argumentation. Den minst avancerade hanteringen behandlar, utan koppling till källor, endast en enstaka del av analysmodellen. I analysarbetet kartläggs också de kritiska aspekter som undervisning behöver fokusera på för att hjälpa eleven från en mindre avancerad uppfattning till en mer avancerad uppfattning, det vill säga för att lära sig att analysera med mer kvalité. Den mest centrala kritiska aspekten visar sig vara att se hur källmaterial är bas för en mer vetenskaplig analys. / It is the writer’s professional experience that upper secondary students often wonder how to improve their skills in analytic reasoning. The aim of this study is to examine conceptions of Swedish upper secondary school-students when it comes to use a model for analytical reasoning in the course Social studies 1b. The research questions are: How do upper secondary student perceive the usage of a model for analytic reasoning? Which qualitative differences can there be between a less complex and a complex conception of the model for analytic reasoning? The research method has been to give an analytic task to 50 upper secondary students aiming to analyze the problem with the diminishing engagement among Swedish youth in the formal democracy process. The participantswere asked to analyze this problem by using the analytic model and a number of sources originating from the Commission on Democracy Report (2014). The student´s answers where analyzed by a Phenomenographic method aiming to find categories of student´s conceptions of the skill of analyzing according to the model. The result, called the learning outcome, was 6 hierarchically structured categories of conceptions, differing from one another in how the analytic model was perceived, the structural aspect, and of how the content of the analysis was handled, the referential aspect. The most complex conception of the analytic model was to perceive it parts as a whole and also use its disposition as a model for the structure of their answers. The least complex conception only handle singular parts of the analytic model and does not use the source material as a factual base for their reasoning. The most central critical aspect to consider when designing teaching for improving the student´s analytic skills is to make them discern the need for source based reasoning if the aim is to develop a more scientific approach.

The present work studies instantaneous motion of smooth planar and spatial objects in unilateral point contacts. The traditional first-order instantaneous kinematic analysis is found insufficient to explain many common physical scenarios. The present work looks beyond the velocity state of motion for a comprehensive understanding through higher-order kinematic analysis of the above system. The methodology proposed herein is a Euclidean space approach to second-order motion space analysis of objects in point contacts. The geometries of the objects are approximated up to second-order in the differential vicinity of the point of contact; meaning, up to curvature at the point of contact. The instantaneous motion is approximated up to second-order kinematics, i.e., up to acceleration state. The basic approach consists of impressing an instantaneous motion upon one object while holding the other fixed which is in a single point contact initially, and observing for one of the following three states: penetration, separation, and persistence of contact between the two objects. These three states are characterized by the interference between the geometries of the objects. Penetration and separation of two curves for rotation about points on the plane is geometrically studied based on the relative configuration of the osculating circles at the point of contact. It is shown that the plane is partitioned into four regions of rotation centers. Partitioning of the plane into motion space regions at a contact provided a geometrical framework compose the motion space for multiple contacts. The applications include second-order form-closure (SFC) and synthesis of kinematic pairs. To explore the consequence of a generic motion, an analytical scheme is formulated using the screw theoretic concepts of twist and twist-derivative. It is shown that the characteristics of second-order motions at a single contact depends only upon the geometric kinematic properties of the motion; meaning, the motion characteristics are time-independent. The geometric conditions for the second-order motion that will be admissible or restrained at a contact are not available in the existing literature on \second-order mobility". The classical Euler-Savary equation for enveloping curves is found to represent the condition which is both necessary and sufficient for the second-order roll-slide motion. An elegant generalized geometric characterization of second-order motions is derived. This is made use for deriving condition of immobilization of, planar mechanisms with up to 2-degrees-of-freedom (d.o.f.), with a single point contact. Illustrative examples of four-bar and 2R-mechanisms are presented. Rapid prototyped model of the four-bar mechanism is fabricated and the SFC theory is verified satisfactorily. Through a novel use of Meusnier's theorem, rotational motion characteristics of planar curves in a point contact is used to determine the patterns and distribution of admissible axes of rotation in space for two surfaces in a single point contact. In the generalized analytical method of motion space analysis, the surfaces are locally represented in Monge's form up to second-order terms and motion is represented using twist and twist-derivative. An analytical framework for the second-order motion space analysis of surfaces with multiple contacts has been developed. Using this procedure, pairs of objects are analyzed for SFC and equivalent lower kinematic pair freedom. Revolute and planar joints with two contacts, prismatic joint with three contacts, SFC of regular concave spherical tetrahedron and regular tetrahedron with four contacts are demonstrated. Although conventional first-order studies demand seven contact points for form-closure, within the context of second-order motion, the present study established that, under special geometric conditions relative immobilization of two smooth objects can be enabled with much fewer contacts. Conditions for immobilization using three and two smooth contacts have been derived. Using contact kinematics equations based on higher-order reciprocity, an instantaneous spatial higher pair to lower pair substitute-connection which is kinematically equivalent up to acceleration analysis for two smooth surfaces in persistent point contact is derived. An illustrative example of a three-link direct-contact mechanism is presented.

Traditionally, the teaching of history tends to focus on content, where historical learning is reflected in memorizing important dates, events, and concepts about the past. In recent decades, research has drawn attention to a new way of approaching historical learning through understanding causes and effects as well as making connections between different events and stories about the past. Such an approach to historical learning implies a developed capacity for historical thinking. To shed light on this, this survey aimed to investigate the interest students have in history, how they perceive the purpose of history and how they experience the content and implementation of history teaching in upper secondary school. This study is based on semi-structured focus group interviews with 12 students in upper secondary school. The focus group interviews were based on the didactic questions of what, how, and why to achieve developed and qualified answers. The outcomes of the interviews were further interpreted and analysed according to the six sub-components advocated in the Anglo-Saxon history teaching tradition to categorize students' historical thinking skills. The results revealed that students' interest in history has a major impact on how they perceive the purpose of history and how they experience the content and conduct of history teaching insecondary school. Findings also showed that using historical sources is completely excluded from students' responses. The present study forms a foundation for future studies interested in a more practical history teaching approach. Furthermore, it renders insights into the complexities of teaching history from a student perspective, while at the same time points to some opportunities for development towards the teaching practitioner in creating a good history educational plan.

No description available.

This qualitative study explores the meaning of interpersonal forgiveness, using a both/and or postmodern epistemology and a phenomenological methodology. Forgiveness is seen as a reframe that could transform a limiting, disempowering dominant narrative into a more empowering and useful story. The researcher interviews three participants to co-create stories of forgiveness. Themes of emotional discomfort; blame and responsibility; shift to empathy; forgiveness as process; and lasting change or forgiveness incorporated into way of life, are identified. / Psychology / M.A. (Clinical Psychology)

With a continuing and rising demand for hydrocarbons, the energy companies are installing infrastructure ever further offshore, where such infrastructure is often exposed to extreme waves. This thesis explores some aspects of wave-structure interaction, particularly the maximum water surface elevation increase in severe storms due to these local interactions. The effects on wave-structure interactions of column cross-sectional shape are investigated using linear and second-order wave diffraction theory. For multi-column structures, the excitation of locally resonant wave modes (near-trapping) is studied for several column cross-sectional shapes, and a simple method for estimating the surface elevation mode shape is given. The structure of the quadratic transfer functions for second-order sum wave elevation is investigated and an approximation assuming these QTFs are flat perpendicular to the leading diagonal is shown to be adequate for the first few lowest frequency modes. NewWave-type focused wave groups can be used as a more realistic model of extreme ocean waves. A Net Amplification Factor based on the NewWave model is given as an efficient tool for finding the incident frequencies most likely to cause a violent wave-structure interaction and where these violent responses are likely to occur. Statistics are collected from Monte Carlo type simulations of random waves to verify the use of the Net Amplification Factor. Going beyond linear calculations, surface elevation statistics are collected to second-order and a `designer' wave is found to model the most extreme surface elevation responses. A `designer' wave can be identified at required levels of return period to help to understand the relative size of harmonic components in extreme waves. The methods developed with a fixed body are then applied to an identical hull which is freely floating, and the responses between the fixed and moving cases are compared. The vertical heave motion of a semi-submersible in-phase with the incident wave crests is shown to lead to a much lower probability of water-deck impact for the same hull shape restrained vertically. The signal processing methods developed are also applied to a single column to allow comparison with experimental results. Individual harmonic components of the hydrodynamic force are identified up to at least the fifth harmonic. Stokes scaling is shown to hold even for the most violent interactions. It is also shown that the higher harmonic components of the hydrodynamic force can be reconstructed from just the fundamental force time history, and a transfer function in the form of a single phase and an amplitude for each harmonic. The force is also reconstructed well to second-order from the surface elevation time history using diffraction transfer functions. Finally, possible causes of damage to a platform high above mean water level in the North Sea are investigated.

The passage of PRWORA in 1996 gave states the opportunity to engage in secondorder devolution (SOD), which allows local governments to exercise more discretionary power in the implementation of welfare policies. Currently 14 states have engaged in significant SOD, with a number of other states practicing SOD to a lesser degree. Given this trend in TANF administration, it is important to explore if and how SOD affects the implementation of TANF work sanctions and work-related policies. Opponents of welfare decentralization insist SOD may lead to a ‘race to the bottom’ in welfare generosity to avoid the immigration of the poor, the loss of business revenue, and financial burden due to fiscal relationship, while proponents of welfare decentralization insist that local governments better understand the needs of the poor and are therefore better able to provide more appropriate services to their welfare clients, thus improving program performance. Existing scholarship on SOD under TANF has focused on the increase in discretion to local government, and how this may enhance variation in policy outcomes or contribute to policy success or stringency across local jurisdictions (Cho et al. 2005 ; Fording, Soss and Schram 2007). However, these studies are limited by the fact that they examine a single state. To date there has been no systematic analysis of the impact of administrative structure on the implementation of welfare policy which compares centralized states with SOD states. In this dissertation, I conduct an analysis of the effects of SOD across the states by exploring how differences in administrative structure due to SOD affect different implementation outcomes. First, I examine the impact of SOD on the implementation of TANF work sanctions, using individual-level administrative data combined with county level data. Second, I examine the impact of SOD on TANF work sanctions, caseload decline, and several work-related TANF outcomes with state-level data. Multilevel analysis and OLS with panel corrected errors are applied for the analyses. Specifically, I test the conventional wisdom that success and punitiveness in policy implementation is enhanced in second-order devolution states, compared to centralized states, due to increased discretion granted to local governments in SOD states.

Cette thèse se concentre autour du problème de l'évaluation des requêtes. Étant donné une requête q et une base de données D, l'objectif est de calculer l'ensemble q(D) des nuplets résultant de l'évaluation de q sur D. Toutefois, l'ensemble q(D) peut être plus grand que la base de données elle-même car elle peut avoir une taille de la forme n^l où n est la taille de la base de données et l est l'arité de la requête. Calculer entièrement q(D) peut donc nécessiter plus que les ressources disponibles. L'objectif principal de cette thèse est une solution particulière à ce problème: une énumération de q(D) avec un délai constant. Intuitivement, cela signifie qu'il existe un algorithme avec deux phases: une phase de pré-traitement qui fonctionne en temps linéaire dans la taille de la base de données, suivie d'une phase d'énumération produisant un à un tous les éléments de q(D) avec un délai constant (indépendant de la taille de la base de données) entre deux éléments consécutifs. En outre, quatre autres problèmes sont considérés: le model-checking (où la requête q est un booléen), le comptage (où on veut calculer la taille |q(D)|), les tests (où on s'intéresse à un test efficace pour savoir si un uplet donné appartient au résultat de la requête) et la j-ième solution (où on veut accéder directement au j-ième élément de q(D)). Les résultats présentés dans cette thèse portent sur les problèmes ci-dessus concernant: - les requêtes du premier ordre sur les classes de structures de degré borné, - les requêtes du second ordre monadique sur les classes de structures de largeur d'arborescente bornée, - les requêtes du premier ordre sur les classes de structures avec expansion bornée.