Korteweg–de Vries solitoniyhtälön diskretointi- ja aikaintegrointimenetelmien vertailua

Solitoni on tunnettu ilmiönä jo 1800-luvun alkupuolelta lähtien. Se on eräänlainen muotonsa säilyttävä ja vakionopeudella etenevä aalto. 1800-luvun loppupuolella esitettiin osittaisdifferentiaaliyhtälön kuvaamaan tällaista matalassa ja kapeassa kanavassa esiintynyttä solitoniaaltoa. Tätä Kortewegin ja de Vries’n mukaan nimettyä osittaisdifferentiaaliyhtälöä tutkivat numeerisesti ensimmäistä kertaa Zabusky ja Kruskal vuonna 1965. Osittaisdifferentiaaliyhtälöiden ratkaisuun tarvitsee usein käyttää numeerisia menetelmiä. Tämän työn alkupuoli käsittelee yleisesti tarvittavia matemaattisia menetelmiä sekä KdV-yhtälön analyyttistä tarkastelua. Loppupuolella tutkitaan KdV-yhtälön mallintamista tietokoneen avulla. Zabuskyn ja Kruskalin käyttämien menetelmien lisäksi kokeillaan montaa muutakin tapaa KdV-yhtälön mallintamiseen. Näistä menetelmistä vertaillaan laskentatehokkuutta sekä menetelmän tarkkuutta. Zabuskyn ja Kruskalin käyttämä paikkadiskretointi todettiin mallinnuksissa tarkimmaksi, mutta ei kuitenkaan mallinnusaikaa tarkastellen tehokkaimmaksi. Aikaintegroinneista Runge-Kutta-menetelmät todettiin parhaiksi. Menetelmien vertailun lisäksi niistä parhaiksi havaittuja sovellettiin muutaman erikoistapauksen, kuten kolmen aallon törmäyksen, mallintamiseen.

Conservation Laws in Cellular Automata

Conservation laws in physics are numerical invariants of the dynamics of a system. In cellular automata (CA), a similar concept has already been defined and studied. To each local pattern of cell states a real value is associated, interpreted as the “energy” (or “mass”, or . . . ) of that pattern.The overall “energy” of a configuration is simply the sum of the energy of the local patterns appearing on different positions in the configuration. We have a conservation law for that energy, if the total energy of each configuration remains constant during the evolution of the CA. For a given conservation law, it is desirable to find microscopic explanations for the dynamics of the conserved energy in terms of flows of energy from one region toward another. Often, it happens that the energy values are from non-negative integers, and are interpreted as the number of “particles” distributed on a configuration. In such cases, it is conjectured that one can always provide a microscopic explanation for the conservation laws by prescribing rules for the local movement of the particles. The onedimensional case has already been solved by Fuk´s and Pivato. We extend this to two-dimensional cellular automata with radius-0,5 neighborhood on the square lattice. We then consider conservation laws in which the energy values are chosen from a commutative group or semigroup. In this case, the class of all conservation laws for a CA form a partially ordered hierarchy. We study the structure of this hierarchy and prove some basic facts about it. Although the local properties of this hierarchy (at least in the group-valued case) are tractable, its global properties turn out to be algorithmically inaccessible. In particular, we prove that it is undecidable whether this hierarchy is trivial (i.e., if the CA has any non-trivial conservation law at all) or unbounded. We point out some interconnections between the structure of this hierarchy and the dynamical properties of the CA. We show that positively expansive CA do not have non-trivial conservation laws. We also investigate a curious relationship between conservation laws and invariant Gibbs measures in reversible and surjective CA. Gibbs measures are known to coincide with the equilibrium states of a lattice system defined in terms of a Hamiltonian. For reversible cellular automata, each conserved quantity may play the role of a Hamiltonian, and provides a Gibbs measure (or a set of Gibbs measures, in case of phase multiplicity) that is invariant. Conversely, every invariant Gibbs measure provides a conservation law for the CA. For surjective CA, the former statement also follows (in a slightly different form) from the variational characterization of the Gibbs measures. For one-dimensional surjective CA, we show that each invariant Gibbs measure provides a conservation law. We also prove that surjective CA almost surely preserve the average information content per cell with respect to any probability measure.

Optimización del framework de paralelización de tareas COMPSs

El propósito de este trabajo es optimizar el sistema de gestión de workflows COMPSs caracterizando el comportamiento de diferentes dispositivos de memoria a nivel de consumo energético y tiempo de ejecución. Para llevar a cabo este propósito, se ha implementado un servicio de caché para COMPSs para conseguir que sea consciente de la jerarquía de memoria y se han realizado múltiples experimentos para caracterizar los dispositivos de memoria y las mejoras en el rendimiento.

Searching for consensus in ahp-group decision making. A bayesian perspective

This paper sets out to identify the initial positions of the different decisionmakers who intervene in a group decision making process with a reducednumber of actors, and to establish possible consensus paths between theseactors. As a methodological support, it employs one of the most widely-knownmulticriteria decision techniques, namely, the Analytic Hierarchy Process(AHP). Assuming that the judgements elicited by the decision makers follow theso-called multiplicative model (Crawford and Williams, 1985; Altuzarra et al.,1997; Laininen and Hämäläinen, 2003) with log-normal errors and unknownvariance, a Bayesian approach is used in the estimation of the relative prioritiesof the alternatives being compared. These priorities, estimated by way of themedian of the posterior distribution and normalised in a distributive manner(priorities add up to one), are a clear example of compositional data that will beused in the search for consensus between the actors involved in the resolution ofthe problem through the use of Multidimensional Scaling tools

Group preference structures in AHP–group decision making

This paper presents a procedure that allows us to determine the preference structures(PS) associated to each of the different groups of actors that can be identified in a groupdecision making problem with a large number of individuals. To that end, it makesuse of the Analytic Hierarchy Process (AHP) (Saaty, 1980) as the technique to solvediscrete multicriteria decision making problems. This technique permits the resolutionof multicriteria, multienvironment and multiactor problems in which subjective aspectsand uncertainty have been incorporated into the model, constructing ratio scales correspondingto the priorities relative to the elements being compared, normalised in adistributive manner (wi = 1). On the basis of the individuals’ priorities we identifydifferent clusters for the decision makers and, for each of these, the associated preferencestructure using, to that end, tools analogous to those of Multidimensional Scaling.The resulting PS will be employed to extract knowledge for the subsequent negotiationprocesses and, should it be necessary, to determine the relative importance of thealternatives being compared using anyone of the existing procedures

Temperature-Specific Competition between Invasive Mosquitofish and an Endangered Cyprinodontid Fish

Condition-specific competition is widespread in nature. Species inhabiting heterogeneous environments tend to differ in competitive abilities depending on environmental stressors. Interactions between these factors can allow coexistence of competing species, which may be particularly important between invasive and native species. Here, we examine the effects of temperature on competitiveinteractions between invasive mosquitofish, Gambusia holbrooki, and an endemic Iberian toothcarp, Aphanius iberus. We compare the tendency to approach heterospecifics and food capture rates between these two species, and examine differences between sexes and species in aggressive interactions, at three different temperatures (19, 24 and 29uC) in three laboratory experiments. Mosquitofish exhibit much more aggression than toothcarp. We show that mosquitofish have the capacity to competitively displace toothcarp through interference competition and this outcome is more likely at higher temperatures. We also show a reversal in the competitive hierarchy through reduced food capture rate by mosquitofish at lower temperatures and suggest that these two types of competition may act synergistically to deprive toothcarp of food at higher temperatures. Males of both species carry out more overtly aggressive acts than females, which is probably related to the marked sexual dimorphism and associated mating systems of these two species. Mosquitofish may thus impact heavily on toothcarp, and competition from mosquitofish, especially in warmer summer months, may lead to changes in abundance of the native species and displacement to non-preferred habitats. Globally increasing temperatures mean that highly invasive, warm-water mosquitofish may be able to colonize environments from which they are currently excluded through reduced physiological tolerance to low temperatures. Research into the effects of temperature on interactions between native and invasive species is thus of fundamental importance

Methods for assessing the sustainability of integrated municipal waste management and

The general striving to bring down the number of municipal landfills and to increase the reuse and recycling of waste-derived materials across the EU supports the debates concerning the feasibility and rationality of waste management systems. Substantial decrease in the volume and mass of landfill-disposed waste flows can be achieved by directing suitable waste fractions to energy recovery. Global fossil energy supplies are becoming more and more valuable and expensive energy sources for the mankind, and efforts to save fossil fuels have been made. Waste-derived fuels offer one potential partial solution to two different problems. First, waste that cannot be feasibly re-used or recycled is utilized in the energy conversion process according to EU’s Waste Hierarchy. Second, fossil fuels can be saved for other purposes than energy, mainly as transport fuels. This thesis presents the principles of assessing the most sustainable system solution for an integrated municipal waste management and energy system. The assessment process includes: · formation of a SISMan (Simple Integrated System Management) model of an integrated system including mass, energy and financial flows, and · formation of a MEFLO (Mass, Energy, Financial, Legislational, Other decisionsupport data) decision matrix according to the selected decision criteria, including essential and optional decision criteria. The methods are described and theoretical examples of the utilization of the methods are presented in the thesis. The assessment process involves the selection of different system alternatives (process alternatives for treatment of different waste fractions) and comparison between the alternatives. The first of the two novelty values of the utilization of the presented methods is the perspective selected for the formation of the SISMan model. Normally waste management and energy systems are operated separately according to the targets and principles set for each system. In the thesis the waste management and energy supply systems are considered as one larger integrated system with one primary target of serving the customers, i.e. citizens, as efficiently as possible in the spirit of sustainable development, including the following requirements: · reasonable overall costs, including waste management costs and energy costs; · minimum environmental burdens caused by the integrated waste management and energy system, taking into account the requirement above; and · social acceptance of the selected waste treatment and energy production methods. The integrated waste management and energy system is described by forming a SISMan model including three different flows of the system: energy, mass and financial flows. By defining the three types of flows for an integrated system, the selected factor results needed in the decision-making process of the selection of waste management treatment processes for different waste fractions can be calculated. The model and its results form a transparent description of the integrated system under discussion. The MEFLO decision matrix has been formed from the results of the SISMan model, combined with additional data, including e.g. environmental restrictions and regional aspects. System alternatives which do not meet the requirements set by legislation can be deleted from the comparisons before any closer numerical considerations. The second novelty value of this thesis is the three-level ranking method for combining the factor results of the MEFLO decision matrix. As a result of the MEFLO decision matrix, a transparent ranking of different system alternatives, including selection of treatment processes for different waste fractions, is achieved. SISMan and MEFLO are methods meant to be utilized in municipal decision-making processes concerning waste management and energy supply as simple, transparent and easyto- understand tools. The methods can be utilized in the assessment of existing systems, and particularly in the planning processes of future regional integrated systems. The principles of SISMan and MEFLO can be utilized also in other environments, where synergies of integrating two (or more) systems can be obtained. The SISMan flow model and the MEFLO decision matrix can be formed with or without any applicable commercial or free-of-charge tool/software. SISMan and MEFLO are not bound to any libraries or data-bases including process information, such as different emission data libraries utilized in life cycle assessments.

An analytic approach to distribution logistics strategic management

Logistics management is increasingly being recognised by many companies to be of critical concern. The logistics function includes directly or indirectly many of the new areas for achieving or maintaining competitive advantage that companies have been forced to develop due to increasing competitive pressures. The key to achieving a competitive advantage is to manage the logistics function strategically which involves determining the most cost effective method of providing the necessary customer service levels from the many combinations of operating procedures in the areas of transportation, warehousing, order processing and information systems, production, and inventory management. In this thesis, a comprehensive distribution logistics strategic management process is formed by integrating the periodic strategic planning process with a continuous strategic issues management process. Strategic planning is used for defining the basic objectives for a company and assuring co operation and synergy between the different functions of a company while strategic issues management is used on a continuous basis in order to deal with environmental and internal turbulence. The strategic planning subprocess consists of the following main phases: (1) situational analyses, (2) defining the vision and strategic goals for the logistics function, (3) determining objectives and strategies, (4) drawing up tactical action plans, and (5) evaluating the implementation of the plans and making the needed adjustments. The aim of the strategic issues management subprocess is to continuously scan the environment and the organisation for early identification of the issues having a significant impact on the logistics function using the following steps: (1) the identification of trends, (2) assessing the impact and urgency of the identified trends, (3) assigning priorities to the issues, and (4) planning responses to the, issues. The Analytic Hierarchy Process (AHP) is a systematic procedure for structuring any problem. AHP is based on the following three principles: decomposition, comparative judgements, and synthesis of priorities. AHP starts by decomposing a complex, multicriteria problem into a hierarchy where each level consists of a few manageable elements which are then decomposed into another set of elements. The second step is to use a measurement methodology to establish priorities among the elements within each level of the hierarchy. The third step in using AHP is to synthesise the priorities of the elements to establish the overall priorities for the decision alternatives. In this thesis, decision support systems are developed for different areas of distribution logistics strategic management by applying the Analytic Hierarchy Process. The areas covered are: (1) logistics strategic issues management, (2) planning of logistic structure, (3) warehouse site selection, (4) inventory forecasting, (5) defining logistic action and development plans, (6) choosing a distribution logistics strategy, (7) analysing and selecting transport service providers, (8) defining the logistic vision and strategic goals, (9) benchmarking logistic performance, and (10) logistic service management. The thesis demonstrates the potential of AHP as a systematic and analytic approach to distribution logistics strategic management.

Defining the location factors of new manufacturing site in chemical industry

The objective of this thesis is to examine the factors that have an impact on the location decision of new manufacturing site and to create the relative order of importance of these factors by analytic hierarchy process (AHP). The decision making process especially related to the location selection and the measurement of the location factors are also examined. In theoretical part the character of decision making process and the relevant methods are introduced. Based on the previous studies of other researchers, the location factors are examined and the main research method, analytic hierarchy process, is also introduced. The empirical part of the study mainly follows the phases of decision making process and is emphasized on the main stages of analytic hierarchy process; building the hierarchy, defining the priorities and analyzing the results. The hierarchy is constructed from seven main criteria which all have several sub criteria. The evaluation of the hierarchy is implemented at the group decision making –laboratory and there can be seen significant differences between the importance of criteria. The final stage in the study is to create the appropriate measurement scales to the chosen criteria.

Päätöksenteon tukeminen kaivosalan yrityksen toiminnanohjausjärjestelmäratkaisun valinnassa

Diplomityön tavoitteena oli tutkia kohdeyrityksen toiminnanohjaukseen sovellettujen tietojärjestelmien nykytilaa ja pyrkiä tunnistamaan siinä vaikuttavia, kehittämistä vaativia kohteita. Nykytilan kartoituksen perusteella työssä oli määrä laatia vertailu liiketoiminnan ohjaamiseen soveltuvien vaihtoehtoisten järjestelmäratkaisuiden välillä. Perusteellisen selvitystyön ja vaihtoehtojen vertailun avulla pyrittiin tuottamaan päätöksentekoa helpottavaa materiaalia kohdeyrityksen toiminnanohjausjärjestelmäratkaisun valinnan tueksi. Keskeisimpinä menetelminä tutkimuksessa hyödynnettiin asiakaskeskeistä toiminnanohjausjärjestelmän käyttöönottomenetelmää C-CEI:tä sekä analyyttistä hierarkiaprosessia AHP:tä. Tutkimuksen perusteella havaittiin, että onnistunut tietojärjestelmäratkaisun valinta edellyttää perusteellista liiketoiminnan nykytilan selvitystä. Yritysten on myös tärkeää tiedostaa, että tällaisiin monikriteerisiin ja hankaliin päätöksentekotilanteisiin on olemassa useita erilaisia päätöksenteon tukimenetelmiä, joiden avulla päätöksenteon ongelmaa kyetään selkeyttämään ja siten helpottamaan ratkaisun löytämistä.

Modeling and developing a customer-oriented configuration process in a mass customization environment

In this thesis the main objective is to examine and model configuration system and related processes. When and where configuration information is created in product development process and how it is utilized in order-delivery process? These two processes are the essential part of the whole configuration system from the information point of view. Empirical part of the work was done as a constructive research inside a company that follows a mass customization approach. Data models and documentation are created for different development stages of the configuration system. A base data model already existed for new structures and relations between these structures. This model was used as the basis for the later data modeling work. Data models include different data structures, their key objects and attributes, and relations between. Representation of configuration rules for the to-be configuration system was defined as one of the key focus point. Further, it is examined how the customer needs and requirements information can be integrated into the product development process. Requirements hierarchy and classification system is presented. It is shown how individual requirement specifications can be connected for physical design structure via features by developing the existing base data model further.

Modulointia ohjaavien tekijöiden valinta asiakkaiden, tuotekehityksen ja valmistuksen vaatimusten perusteella

Modular drivers cover the entire product life cycle and when the most important modular drivers are known, it is possible to focus on the most essential areas in modularization. Modular drivers are helpful while planning modularization, selecting modules to manufacture and evaluating the success of the modularization. When the modules are formed based on the modular drivers it is also possible to develop production processes according to the requirements of a certain module. The objective of the Master’s Thesis was to organize the modular drivers based on the weightings in order to make the modularization process easier. The phases to find the most important module drivers were formed based on the existing literature and background material from the company. During the Master’s Thesis project the weights of the modular drivers were determined according to the requirements of customers, product development and manufacturing. The requirements were established by a questionnaire and the weights for the requirements were selected in an interview using the Analytic Hierarchy Process. The modular drivers were compared pairwise by the view point of the requirements of certain group. When the results of the three groups were integrated, the weights of the modular drivers were found and it was possible to select the most important drivers.

Analysis of electricity distribution network operation business models and capitalization of control room functions with DMS

Electricity distribution network operation (NO) models are challenged as they are expected to continue to undergo changes during the coming decades in the fairly developed and regulated Nordic electricity market. Network asset managers are to adapt to competitive technoeconomical business models regarding the operation of increasingly intelligent distribution networks. Factors driving the changes for new business models within network operation include: increased investments in distributed automation (DA), regulative frameworks for annual profit limits and quality through outage cost, increasing end-customer demands, climatic changes and increasing use of data system tools, such as Distribution Management System (DMS). The doctoral thesis addresses the questions a) whether there exist conditions and qualifications for competitive markets within electricity distribution network operation and b) if so, identification of limitations and required business mechanisms. This doctoral thesis aims to provide an analytical business framework, primarily for electric utilities, for evaluation and development purposes of dedicated network operation models to meet future market dynamics within network operation. In the thesis, the generic build-up of a business model has been addressed through the use of the strategicbusiness hierarchy levels of mission, vision and strategy for definition of the strategic direction of the business followed by the planning, management and process execution levels of enterprisestrategy execution. Research questions within electricity distribution network operation are addressed at the specified hierarchy levels. The results of the research represent interdisciplinary findings in the areas of electrical engineering and production economics. The main scientific contributions include further development of the extended transaction cost economics (TCE) for government decisions within electricity networks and validation of the usability of the methodology for the electricity distribution industry. Moreover, DMS benefit evaluations in the thesis based on the outage cost calculations propose theoretical maximum benefits of DMS applications equalling roughly 25% of the annual outage costs and 10% of the respective operative costs in the case electric utility. Hence, the annual measurable theoretical benefits from the use of DMS applications are considerable. The theoretical results in the thesis are generally validated by surveys and questionnaires.

Makt som fullmakt : ett vårdvetenskapligt perspektiv

The aim of this study is to deepen understanding and knowledge of the concepts and phenomenaof power and authority from the standpoint of caring science. The overall questions of the research are: What is power? What is authority? How do power and authority manifest themselves in the context of caring? How are power and authorityto be understood as caring science concepts? The overall research inception is determination of the concepts in accordance with the hermeneutic approach based on Eriksson's model. The process of understanding follows Gadamer's (1999) hermeneutics. The thesis consists of three part studies. An ontological determinationof the character of the concepts is carried out where a hermeneutic interpretation is made of texts in the Old and the New Testaments in the Bible. The pragmatic features of the concepts are studied on the basis of nurses' written stories of authority and patients' written stories of power and authority. Beside the review of literature concerning power and authority a qualitative meta-analysis ofthe concept and the phenomenon of empowerment are made. The ontological determination shows how a human being's power is the authority to hold every living thing in trust, to tend and care life. To anyone using this authority, serving onesfellow-being is the purpose. Understanding the pragmatical features of authority in the stories of nurses reveals the life-giving nature of serving. By serving the nurse draws near her true mission as a human being, her authority to care for life with love. The service of the nurse and her ability to see and confirm the patient's otherness creates confidence and results in her authority. The nursedoes not abandon the responsibility associated with authority. When the patientdoes not entrust the nurse with authority the nurse employs her inherent authority to alleviate the suffering of the patient. The pragmatical features of the concepts of power and authority in the patients' stories indicate how the nurse puts her power to an improper use if she only makes use of the authority conferred by the hierarchy of power in the organisation, assumes all power and fails to use her faculty for loving care. Patients feel that their existence is threatened when the nurse tries to deprive them of their authority; they experience homelessness, despair and impotence. Patients' struggle for existence and absolute dignity deprives their health processes of strength, and their suffering becomes unbearable. Patients recognize their vitality when encountering a nurse who uses her authority to alleviate the patients' suffering. The power of compassion is strong, and the patients' dignity is recreated when they are able to serve fellowpatients or nurses. The purpose of human life can be understood as the use of one's own inner power and strength. Love.

Alueellistettavien virastojen toimitilojen hankinta

Tutkimus käsittelee julkisia toimitilahankintoja, alueellistamistoimia sekä päätöksentekoprosessia. Tutkimuksen tavoitteena on tutkia julkisiin toimitilahankintoihin liittyvää lainsäädäntöä, toimintamalleja ja määritellä analyyttistä hierarkiaprosessia apuna käyttäen yhdelle valtion virastolle kokonaistaloudellisesti paras mahdollinen toimitila Lappeenrannasta. Tutkimuskohteena on Liikennevirasto, joka osittain alueellistetaan Lappeenrantaan. Kirjallisuuden pohjalta muodostetaan työn laaja teoriapohja, empiirinen aineisto puolestaan koostuu asiantuntija- ja yrityshaastatteluista. Työssä on esitelty lopuksi myös muutama mielenkiintoinen jatkotutkimuksen arvoinen aihe.