Microparticles obtained by complex coacervation: influence of the type of reticulation and the drying process on the release of the core material

Microparticles obtained by complex coacervation were crosslinked with glutaraldehyde or with transglutaminase and dried using freeze drying or spray drying. Moist samples presented Encapsulation Efficiency (%EE) higher than 96%. The mean diameters ranged from 43.7 ± 3.4 to 96.4 ± 10.3 µm for moist samples, from 38.1 ± 5.36 to 65.2 ± 16.1 µm for dried samples, and from 62.5 ± 7.5 to 106.9 ± 26.1 µm for rehydrated microparticles. The integrity of the particles without crosslinking was maintained when freeze drying was used. After spray drying, only crosslinked samples were able to maintain the wall integrity. Microparticles had a round shape and in the case of dried samples rugged walls apparently without cracks were observed. Core distribution inside the particles was multinuclear and homogeneous and core release was evaluated using anhydrous ethanol. Moist particles crosslinked with glutaraldehyde at the concentration of 1.0 mM.g-1 protein (ptn), were more efficient with respect to the core retention compared to 0.1 mM.g-1 ptn or those crosslinked with transglutaminase (10 U.g-1 ptn). The drying processes had a strong influence on the core release profile reducing the amount released to all dry samples

Docosahexaenoic acid ethyl esther (DHAEE) microcapsule production by spray-drying: optimization by experimental design

Docosahexaenoic acid is an essential polyunsaturated fatty acid with important metabolic activities. Its conjugated double bonds make it susceptible to decomposition. Its stability may be improved through fatty acid entrapment with a spray-drying technique; however, the many parameters involved in this technique must be considered to avoid affecting the final product quality. Therefore, this study aimed to evaluate the entrapment conditions and yields of fish oil enriched with docosahexaenoic acid ethyl ester. Microcapsules were obtained from Acacia gum using a spray-drying technique. The experimental samples were analyzed by chromatography and delineated by Statistica software, which found the following optimum entrapment conditions: an inlet temperature of 188 °C; 30% core material; an N2 flow rate of 55 mm; and a pump flow rate of 12.5 mL/minute. These conditions provided a 66% yield of docosahexaenoic acid ethyl ester in the oil, corresponding to 19.8% of entrapped docosahexaenoic acid ethyl ester (w/w). This result was considered significant since 30% corresponded to wall material.

Coolability of porous core debris beds : Effects of bed geometry and multi-dimensional flooding

This thesis addresses the coolability of porous debris beds in the context of severe accident management of nuclear power reactors. In a hypothetical severe accident at a Nordic-type boiling water reactor, the lower drywell of the containment is flooded, for the purpose of cooling the core melt discharged from the reactor pressure vessel in a water pool. The melt is fragmented and solidified in the pool, ultimately forming a porous debris bed that generates decay heat. The properties of the bed determine the limiting value for the heat flux that can be removed from the debris to the surrounding water without the risk of re-melting. The coolability of porous debris beds has been investigated experimentally by measuring the dryout power in electrically heated test beds that have different geometries. The geometries represent the debris bed shapes that may form in an accident scenario. The focus is especially on heap-like, realistic geometries which facilitate the multi-dimensional infiltration (flooding) of coolant into the bed. Spherical and irregular particles have been used to simulate the debris. The experiments have been modeled using 2D and 3D simulation codes applicable to fluid flow and heat transfer in porous media. Based on the experimental and simulation results, an interpretation of the dryout behavior in complex debris bed geometries is presented, and the validity of the codes and models for dryout predictions is evaluated. According to the experimental and simulation results, the coolability of the debris bed depends on both the flooding mode and the height of the bed. In the experiments, it was found that multi-dimensional flooding increases the dryout heat flux and coolability in a heap-shaped debris bed by 47–58% compared to the dryout heat flux of a classical, top-flooded bed of the same height. However, heap-like beds are higher than flat, top-flooded beds, which results in the formation of larger steam flux at the top of the bed. This counteracts the effect of the multi-dimensional flooding. Based on the measured dryout heat fluxes, the maximum height of a heap-like bed can only be about 1.5 times the height of a top-flooded, cylindrical bed in order to preserve the direct benefit from the multi-dimensional flooding. In addition, studies were conducted to evaluate the hydrodynamically representative effective particle diameter, which is applied in simulation models to describe debris beds that consist of irregular particles with considerable size variation. The results suggest that the effective diameter is small, closest to the mean diameter based on the number or length of particles.

Collectiveness within startup teams – Leading the way to initiating and managing collective pursuit of opportunities in organizational contexts

While traditional entrepreneurship literature addresses the pursuit of entrepreneurial opportunities to a solo entrepreneur, scholars increasingly agree that new ventures are often founded and operated by entrepreneurial teams as collective efforts especially in hightechnology industries. Researchers also suggest that team ventures are more likely to survive and succeed than ventures founded by the individual entrepreneur although specific challenges might relate to multiple individuals being involved in joint entrepreneurial action. In addition to new ventures, entrepreneurial teams are seen central for organizing work in established organizations since the teams are able to create major product and service innovations that drive organizational success. Acknowledgement of the entrepreneurial teams in various organizational contexts has challenged the notion on the individual entrepreneur. However, considering that entrepreneurial teams represent a collective-level phenomenon that bases on interactions between organizational members, entrepreneurial teams may not have been studied as indepth as could be expected from the point of view of the team-level, rather than the individual or the individuals in the team. Many entrepreneurial team studies adopt the individualized view of entrepreneurship and examine the team members’ aggregate characteristics or the role of a lead entrepreneur. The previous understandings might not offer a comprehensive and indepth enough understanding of collectiveness within entrepreneurial teams and team venture performance that often relates to the team-level issues in particular. In addition, as the collective-level of entrepreneurial teams has been approached in various ways in the existing literatures, the phenomenon has been difficult to understand in research and practice. Hence, there is a need to understand entrepreneurial teams at the collective-level through a systematic and comprehensive perspective. This study takes part in the discussions on entrepreneurial teams. The overall objective of this study is to offer a description and understanding of collectiveness within entrepreneurial teams beyond individual(s). The research questions of the study are: 1) what collectiveness within entrepreneurial teams stands for, what constitutes the basic elements of it, and who are included in it, 2) why, how, and when collectiveness emerges or reinforces within entrepreneurial teams, and 3) why collectiveness within entrepreneurial teams matters and how it could be developed or supported. In order to answer the above questions, this study bases on three approaches, two set of empirical data, two analysis techniques, and conceptual study. The first data set consists of 12 qualitative semi-structured interviews with business school students who are seen as prospective entrepreneurs. The data is approached through a social constructionist perspective and analyzed through discourse analysis. The second data set bases on a qualitative multiplecase study approach that aims at theory elaboration. The main data consists of 14 individual and four group semi-structured thematic interviews with members of core entrepreneurial teams of four team startups in high-technology industries. The secondary data includes publicly available documents. This data set is approached through a critical realist perspective and analyzed through systematic thematic analysis. The study is completed through a conceptual study that aims at building a theoretical model of collective-level entrepreneurship drawing from existing literatures on organizational theory and social-psychology. The theoretical work applies a positivist perspective. This study consists of two parts. The first part includes an overview that introduces the research background, knowledge gaps and objectives, research strategy, and key concepts. It also outlines the existing knowledge of entrepreneurial team literature, presents and justifies the choices of paradigms and methods, summarizes the publications, and synthesizes the findings through answering the above mentioned research questions. The second part consists of five publications that address independent research questions but all enable to answer the research questions set for this study as a whole. The findings of this study suggest a map of relevant concepts and their relationships that help grasp collectiveness within entrepreneurial teams. The analyses conducted in the publications suggest that collectiveness within entrepreneurial teams stands for cognitive and affective structures in-between team members including elements of collective entity, collective idea of business, collective effort, collective attitudes and motivations, and collective feelings. Collectiveness within entrepreneurial teams also stands for specific joint entrepreneurial action components in which the structures are constructed. The action components reflect equality and democracy, and open and direct communication in particular. Collectiveness emerges because it is a powerful tool for overcoming individualized barriers to entrepreneurship and due to collectively oriented desire for, collective value orientation to, demand for, and encouragement to team entrepreneurship. Collectiveness emerges and reinforces in processes of joint creation and realization of entrepreneurial opportunities including joint analysis and planning of the opportunities and strategies, decision-making and realization of the opportunities, and evaluation, feedback, and sanctions of entrepreneurial action. Collectiveness matters because it is relevant for potential future entrepreneurs and because it affects the ways collective ventures are initiated and managed. Collectiveness also matters because it is a versatile, dynamic, and malleable phenomenon and the ideas of it can be applied across organizational contexts that require team work in discovering or creating and realizing new opportunities. This study further discusses how the findings add to the existing knowledge of entrepreneurial team literature and how the ideas can be applied in educational, managerial, and policy contexts.

Characterisation of Cladonia rangiferina transcriptome and genome, and the effects of dehydration and rehydration on its gene expression

Lichens are symbiotic organisms, which consist of the fungal partner and the photosynthetic partner, which can be either an alga or a cyanobacterium. In some lichen species the symbiosis is tripartite, where the relationship includes both an alga and a cyanobacterium alongside the primary symbiont, fungus. The lichen symbiosis is an evolutionarily old adaptation to life on land and many extant fungal species have evolved from lichenised ancestors. Lichens inhabit a wide range of habitats and are capable of living in harsh environments and on nutrient poor substrates, such as bare rocks, often enduring frequent cycles of drying and wetting. Most lichen species are desiccation tolerant, and they can survive long periods of dehydration, but can rapidly resume photosynthesis upon rehydration. The molecular mechanisms behind lichen desiccation tolerance are still largely uncharacterised and little information is available for any lichen species at the genomic or transcriptomic level. The emergence of the high-throughput next generation sequencing (NGS) technologies and the subsequent decrease in the cost of sequencing new genomes and transcriptomes has enabled non-model organism research on the whole genome level. In this doctoral work the transcriptome and genome of the grey reindeer lichen, Cladonia rangiferina, were sequenced, de novo assembled and characterised using NGS and traditional expressed sequence tag (EST) technologies. RNA extraction methods were optimised to improve the yield and quality of RNA extracted from lichen tissue. The effects of rehydration and desiccation on C. rangiferina gene expression on whole transcriptome level were studied and the most differentially expressed genes were identified. The secondary metabolites present in C. rangiferina decreased the quality – integrity, optical characteristics and utility for sensitive molecular biological applications – of the extracted RNA requiring an optimised RNA extraction method for isolating sufficient quantities of high-quality RNA from lichen tissue in a time- and cost-efficient manner. The de novo assembly of the transcriptome of C. rangiferina was used to produce a set of contiguous unigene sequences that were used to investigate the biological functions and pathways active in a hydrated lichen thallus. The de novo assembly of the genome yielded an assembly containing mostly genes derived from the fungal partner. The assembly was of sufficient quality, in size similar to other lichen-forming fungal genomes and included most of the core eukaryotic genes. Differences in gene expression were detected in all studied stages of desiccation and rehydration, but the largest changes occurred during the early stages of rehydration. The most differentially expressed genes did not have any annotations, making them potentially lichen-specific genes, but several genes known to participate in environmental stress tolerance in other organisms were also identified as differentially expressed.

Tulevaisuuden lähtökohdista kansanvallan kolmiliittoon. Kansallinen Edistyspuolue ja kansallisen eheytymisen politiikka 1919–1939.

Kansallista Edistyspuoluetta ja sen toimijoita maailmansotien välisen Suomen sisäpolitiikassa tarkasteleva väitöstutkimus paneutuu puolueen kansallista eheytymistä ajaneen poliittisen linjan taustoihin, muodostumiseen ja toteutumiseen maailmansotien välisenä aikana vuosina 1919-1939. Vahvasti aineistopohjainen ja lähdekriittinen poliittisen historian tutkimus keskittyy parlamentaarisiin toimijoihin, poliittiseen kenttään ja näiden tuottamiin aineistoihin, kuten edistyspuolueen ja sen toimijoiden arkistoihin, lehdistöön ja valtiopäiväpöytäkirjoihin. Tutkimus selvittää, millainen oli edistyspuolueen kansallisen eheytymisen linja, mihin sillä pyrittiin, miten sitä toteutettiin ja miten se toteutui. Kansainvälisen vertailun kautta tutkimuksessa luodaan myös kuva suomalaisesta liberalismista ja liberalistista. Joulukuussa 1918 perustettu Kansallinen Edistyspuolue oli liberaali puolue, jonka politiikassa korostui erityisesti liberalismin sosiaalinen tulkinta. Puolueen sisäpoliittiseksi linjaksi vastaitsenäistyneessä ja sisällissodan runtelemassa valtiossa muodostui kansallisen eheytymisen edistäminen. Ajatuksen taustalla olivat K. J. Ståhlbergin tulevaisuuden lähtökohtia hahmotelleet artikkelit, jotka julkaistiin Helsingin Sanomissa huhtikuussa 1918 sisällissodan vielä riehuessa. Ståhlbergin mukaan kansalliseen eheytymiseen ei tullut pyrkiä sodan vuoksi vaan siitä huolimatta. Nuorsuomalaiselta puolueelta perityt liberaalit periaatteet täydentyivätkin edistyspuoluelaisessa ajattelussa sisällissodan ja tasavallan puolesta käydyn valtiomuototaistelun avainkokemuksilla. Itsenäisen Suomen ensimmäisiä vuosia hallinneissa keskustahallituksissa kansallista eheytymistä edistettiin sosiaalipoliittisin uudistuksin mm. oppivelvollisuus- ja asutuslakien muodossa. Myös sisällissodan vankien armahdukset olivat osa tätä ohjelmaa. Tutkimus osoittaa, että edistyspuolueen kansallisen eheytymisen politiikan keskeisenä tavoitteena oli poliittisen sovittelun kautta integroida vasemmisto osaksi parlamentaaris-demokraattista järjestelmää. Eheytyspolitiikan todellinen käyttöarvo ja edistyspuolueen poliittiset toimintamahdollisuudet alkoivat kuitenkin heiketä vuoden 1922 eduskuntavaalien jälkeen.Tutkimuksesta käy ilmi, että toteutettu eheytyspolitiikka ja sen osittainen epäonnistuminen näkyivät sekä kommunistien jatkuvana kannatuksena että sisäpoliittisen ilmapiirin oikeistolaistumisena. Tämä kehitys nosti myös edistyspuolueessa esille voimat, jotka suosivat porvariyhteistyötä ohi keskustavasemmistolaisen eheytyspoliittisen linjan. Alkuvuosien jälkeen valtiomuototaistelun koossapitävä voima heikkeni edistyspuolueen sisällä ja 1920-luvun puolivälissä käydyt linjakiistat osoittivat, että osalle puolueen jäsenistä vuoden 1918 puoluevalinnassa keskeisemmässä roolissa oli ollut tasavaltalaisuus kuin vasemmiston integrointi ja kansallinen eheytyminen. Edistyspuolueen johto ei kuitenkaan ollut valmis luopumaan eheytyspoliittisesta linjasta ja sen ympärille luodusta puolueidentiteetistä, joten porvariyhteistyötä kannattanut oikeisto-oppositio päätyi suurelta osin eroamaan puolueesta vuonna 1927. Tutkimus osoittaa, että parlamentarismin rapautuminen ja pienelle yleispuolueelle elintärkeiden yhteistyömahdollisuuksien heikkeneminen luokkapuolueiden puristuksessa johtivat edistyspuolueen kannatuksen alamäkeen sotien välisenä aikana. Se kutistui 26 kansanedustajan keskisuuresta puolueesta vain kuuden edustajan pienpuolueeksi. Puolueidentiteetin vahvuus ja keskeisten toimijoiden puolueen kokoa suurempi poliittinen painoarvo pitivät sen lakkauttamispohdinnoista huolimatta kuitenkin koossa ja kiinni politiikan ytimessä. Oikeistoradikalismin vuodet 1920–1930-lukujen taitteessa olivat edistyspuolueellesekä uhka että mahdollisuus. Tutkimuksessa käy ilmi, että vaikka kommunisminvastaisen kansanliikkeen vaatimukset olivat edistyspuoluelaisten mielestä oikeutettuja, oli kansanliikkeen niiden ajamiseksi omaksumia laittomia ja ulkoparlamentaarisia keinoja vaikea hyväksyä. Eheytyspolitiikan kannalta katsottuna melkotoivottamalta näyttänyt tilanne kääntyi kuitenkin lopulta voitoksi: äärivasemmisto eliminoitiin, äärioikeisto ajautui paitsioon ja tie maltillisen vasemmiston ja keskustan yhteistyölle aukesi jälleen. Tämä johti lopulta vuonna 1937 punamultahallitukseen ja kansanvallan kolmiliittoon Kansallisen Edistyspuolueen, SDP:n ja Maalaisliiton kesken. Kokemus siitä, että itsenäisyys oli alati uhattuna, toi suomalaiseen liberalismiin varsin nationalistisia piirteitä, joita eurooppalaisten veljespuolueiden ohjelmista ei löydy. Liberalismiin usein liitetty mielleyhtymä sen kosmopoliittisesta, kansallisvaltioita ylittävästä luonteesta jäi Suomessa sotien välisenä aikana nationalismin ja itäisen naapurin luoman uhan varjoon. Suomen sisäpoliittinen tilanne ja geopoliittinen asema loivat vaatimuksen vahvasta kansallisesta yhtenäisyydestä. Suomalainen liberalismi määrittyikin eurooppalaisia vastineitaan voimakkaammin nuorta valtiota hallinneen kansallisuusajattelun, itsesäilytysvaiston ja kansallisen eheyden vaatimusten kautta. Tutkimuksessa todetaan, että edistyspuolueen eheytyspoliittisen linjan muotoutumista ja toteutumista vuosien 1919‒1939 aikana voi pitää idealismin voittona realismista. Lukuun ottamatta reformipolitiikan vuosia edistyspuolueen pitäytyminen valitulla linjalla näyttäytyi poliittisten toimintamahdollisuuksien kannalta katsottuna ajoittain jopa epärealistiselta. Koko sotien välistä aikaa tarkastellessa voikin todeta, että se, minkä edistyspuolue poliittisten päämäärien saavuttamisen valossa voitti, sen se menetti kannatusluvuissa.

The Impact of Event Marketing on Brand Awareness in eSport Industry

The purpose of this qualitative research is to study what is the impact of event marketing on brand awareness in the context of electronic sport industry. Based on the research questions, the theoretical framework will be developed. This research will analyze earlier theories, and also searching more fresh literature to explain the current phenomenon in the eSport industry. In the empirical part, there were total of five case companies interviewed. The context of this research is eSport, which has its own chapter. The theoretical part of the thesis focuses on event marketing and brand awareness. In this research, event marketing is analyzed from the event organizers perspective. In some occasions, event exhibitors’ perspective is also analyzed. In brand awareness, the focus is how to create a brand recognizable, recalled and from there top of mind in consumers’ minds. The results of this research revealed that many companies’ struggles on getting their brand recognizable. Some of the case companies lacks a strategy and don’t exactly know the core values of their customers. However some of the case companies were opposite. One reason behind this is that some of them has experience on the field and the companies have resources that covers them. Also the current strong brand has clearly a positive affect on their business.

States and Economic Development

Today the Washington Consensus on development lies in tatters. The recent history of the developing world has been unkind to the core claim that a nation that opens its economy and keeps government's role to a minimum invariably experiences rapid economic growth. The evidence against this claim is strong: the developing world as a whole grew faster during the era of state intervention and import substitution (1950-1980) than in the more recent era of structural adjustment (1990-2005); and the recent economic performance of both Latin America and Sub-Saharan Africaregions that truly embraced neoliberalismhas lagged well behind that of many Asian economies, which have instead pursued judicial and unorthodox combinations of state intervention and economic openness. As scholars and policy makers reconstruct alternatives to the Washington Consensus on development, it is important to underline that prudent and effective state intervention and selective integration with the global economy have been responsible for development success in the past; they are also likely to remain the recipes for upward mobility in the global economy in the future."

A teoria da perspectiva e as mudanças de preferência no mainstream: um prospecto Lakatoseano

The theory of the perspective and the changes of preference in the mainstream: a Lakatosean prospect. For many decades over the 20th Century, the mainstream of economics adopted a normative and axiomatic theory of individual behavior in which maximizing procedures were carried out by rationally unbounded agents. This status has been challenged on many grounds and alternative views from fields like psychology have found a way into the core of economics research frontier. Prospect theory, developed by psychologists Daniel Kahneman and Amos Tversky since the 1970s, has provided a more empirical, inductive and descriptive theory of decision making. It has made significant inroads into mainstream microeconomics, shaking the habits of some of its practitioners. This paper first takes stock of its main developments and then uses a Lakatosian framework to draw out its negative and positive heuristics. In what follows, its heuristics are compared to those of traditional rational decision-making theories. The differences between them are highlighted, pointing to changes in the mainstream of the profession and to new opportunities for research.

Datenherrschaft – an Ethically Justified Solution to the Problem of Ownership of Patient Information

Patient information systems are crucial components for the modern healthcare and medicine. It is obvious that without them the healthcare cannot function properly – one can try to imagine how brain surgery could be done without using information systems to gather and show information needed for an operation. Thus, it can be stated that digital information is irremovable part of modern healthcare. However, the legal ownership of patient information lacks a coherent and justified basis. The whole issue itself is actually bypassed by controlling pa- tient information with different laws and regulations how patient information can be used and by whom. Nonetheless, the issue itself – who owns the patient in- formation – is commonly missed or bypassed. This dissertation show the problems if the legislation of patient information ownership is not clear. Without clear legislation, the outcome can be unexpected like it seems to be in Finland, Sweden and United Kingdom: the lack of clear regulation has come up with unwanted consequences because of problematic Eu- ropean Union database directive implementation in those countries. The legal ownership is actually granted to the creators of databases which contains the pa- tient information, and this is not a desirable situation. In healthcare and medicine, we are dealing with issues such as life, health and information which are very sensitive and in many cases very personal. Thus, this dissertation leans on four philosophical theories form Locke, Kant, Heidegger and Rawls to have an ethically justified basis for regulating the patient infor- mation in a proper way. Because of the problems of property and ownership in the context of information, a new concept is needed and presented to replace the concept of owning, that concept being Datenherrschaft (eng. mastery over in- formation). Datenherrschaft seems to be suitable for regulating patient infor- mation because its core is the protection of one’s right over information and this aligns with the work of the philosophers whose theories are used in the work. The philosophical argumentation of this study shows that Datenherrschaft granted to the patients is ethically acceptable. It supports the view that patient should be controlling the patient information about themselves unless there are such specific circumstance that justifies the authorities to use patient information to protect other people’s basic rights. Thus, if the patients would be legally grant- ed Datenherrschaft over patient information we would endorse patients as indi- viduals who have their own and personal experience of their own life and have a strong stance against any unjustified paternalism in healthcare. Keywords: patient information, ownership, Datenherrschaft, ethics, Locke, Kant, Heidegger, Rawls

A crise do sistema financeiro globalizado contemporâneo

The paper analyses the development of the contemporary global financial system as a consequence of markets as well as States strategies. This global financial system based on the flexible dollar has generated many financial bubbles since it started in the 80s, of which the 2008 crisis is the latest and the largest, particularly because it affected the main banks in the core market of the system, the U.S. On the last decades, banks had changed their business strategies from traditional lending activities towards more speculative investments, similar to what hedge funds do.

Big Datan liiketoiminnalliset mahdollisuudet ja haasteet

Tämän kandidaatintutkielman tarkoituksena oli selvittää minkälaisia liiketoiminnallisia mahdollisuuksia ja haasteita Big Dataan ja sen ominaispiirteisiin liittyy, ja miten Big Data määritellään nykyaikaisesti ja ajankohtaisesti. Tutkimusongelmaa lähestyttiin narratiivisen kirjallisuuskatsauksen keinoin. Toisin sanoen tutkielma on hajanaisen tiedon avulla koostettu yhtenäinen katsaus nykytilanteeseen. Lähdeaineisto koostuu pääosin tieteellisistä artikkeleista, mutta käytössä oli myös oppikirjamateriaalia, konferenssijulkaisuja ja uutisartikkeleja. Tutkimuksessa käytetyt akateemisen kirjallisuuden lähteet sisälsivät keskenään paljon samankaltaisia näkemyksiä tutkimusaihetta kohtaan. Niiden perusteella muodostettiin kaksi taulukkoa havaituista mahdollisuuksista ja haasteista, ja taulukoiden rivit nimettiin niitä kuvaavien ominaispiirteiden mukaan. Tutkimuksessa liiketoiminnalliset mahdollisuudet ja haasteet jaettiin viiteen pääkategoriaan ja neljään alakategoriaan. Tutkimus toteutettiin liiketoiminnan näkökulmasta, joten siinä sivuutettiin monenlaisia Big Datan teknisiä aspekteja. Tutkielman luonne on poikkitieteellinen, ja sen avulla pyritään havainnoimaan tämän hetken yhtä uusinta tietojenkäsittelykäsittelytieteiden termiä liiketoiminnallisessa kontekstissa. Tutkielmassa Big Dataan liittyvillä ominaispiirteillä todettiin olevan mahdollisuuksia, jotka voitiin jaotella korrelaatioiden havaitsemisen perusteella markkinoiden tarkemman segmentoinnin mahdollisuuksiin ja päätöksenteon tukena toimimiseen. Reaaliaikaisen seurannan mahdollisuudet perustuvat Big Datan nopeuteen ja kokoon, eli sen jatkuvaan kasvuun. Ominaispiirteisiin liittyvät haasteet voidaan jakaa viiteen kategoriaan, joista osa liittyy toimintaympäristöön ja osa organisaation sisäiseen toimintaan.

Vakavat reaktorionnettomuudet ja niiden mallintaminen Olkiluoto 1 ja Olkiluoto 2 laitosyksiköille MELCOR-ohjelman versiolla 2.1

Vakaviin reaktorionnettomuuksiin liittyviä ilmiöitä on tutkittu jo 1980-luvulta lähtien ja tutkitaan edelleen. Ilmiöt liittyvät reaktorisydämen ja muiden paineastian sisäisten materi-aalien sulamiseen sekä reagointiin veden ja höyryn kanssa. Ilmiöt on myös tärkeää tuntea ja niiden esiintymistä mallintaa käytössä olevilla laitoksilla, jotta voidaan varmistua turval-lisuusjärjestelmien riittävyydestä. Olkiluoto 1 ja 2 laitosten käyttölupa uusitaan vuoteen 2018 mennessä. Lupaprosessiin liit-tyy analyysejä, joissa mallinnetaan laitosten toimintaa vakavassa reaktorionnettomuudessa. Näiden analyysien tekoon Teollisuuden Voima Oyj on käyttänyt ohjelmaa nimeltä MEL-COR jo vuodesta 1994 lähtien. Käytössä on ollut useita eri ohjelmaversioita ja viimeisin niistä on 1.8.6, joka riittää vielä tulevan käyttöluvan uusintaprojektiin liittyvien analyysien tekoon. MELCOR:n vanhaa 1.8.6 ohjelmaversioita ei kuitenkaan enää päivitetä, joten siirtyminen uudempaan 2.1 versioon on tulevaisuudessa välttämätöntä. Uusimman versiopäivityksen yhteydessä on kuitenkin muuttunut koko ohjelman lähdekoodi ja vanhojen laitosmallien käyttö uudessa ohjelmaversiossa vaatii tiedostojen konvertoinnin. Tässä työssä esitellään MELCOR-version 2.1 ominaisuuksia ja selvitetään, mitä 1.8.6 versioon luotujen laitosmal-lien käyttöönotto versiossa 2.1 vaatii. Vaatimusten määrittelemiseksi laitosmalleilla tehdään ajoja molemmilla ohjelmaversioilla ja erilaisilla onnettomuuden alkutapahtuman määrittelyillä. Tulosten perusteella arvioidaan ohjelmaversioiden eroja ja pohditaan mitä puutteita laitosmalleihin konversion jälkeen jää. Näiden perusteella arvioidaan mitä jatkotoimenpiteitä konversio vaatii.