Assessment of endocrine disrupting activities in the aquatic environment

Hormonstörande ämnen är syntetiska eller naturliga ämnen som stör organismers hormonsystem och bidrar till könsförvirring och sterilitet. Sådana ämnen kommer i ökande takt ut i vattenmiljön genom rester av läkemedel, bekämpningsmedel och industriprodukter. Eftersom det finns många likheter mellan hormonsystemen hos människan och övriga ryggradsdjur kan till exempel fiskar användas som modellsystem för att underöka detta problem. I tidigare undersökningar har man funnit hormonella störningar, bl.a. feminisering och maskulinisering hos fiskar som utsatts för avfallsvatten från kommunala reningsverk eller avfallsvatten från pappersindustrin. Målet med denna avhandling var att undersöka om renat avfallsvatten från kommunala reningsverk längs Finlands kust innehåller hormonstörande ämnen i sådana mängder att de kan försorsaka hormonstörande effekter på fisk. Målet i denna avhandling var också att utveckla cellulära testsystem baserade på fiskceller, eftersom behovet av tillförlitliga och kostnadseffektiva cellbaserade tester för att underlätta riskbedömningen av hormonstörande ämnen är mycket stort för tillfället. Som testsystem har storspiggen använts, som besitter flera användbara biomarkörer för att mäta hormonstörande ämnens påverkan. Resultaten tyder på att problemen med hormonstörande påverkan på fisk inte är lika utbredda i Finland som i många andra europeiska länder. Detta beror troligtvis på att finska reningsverk har effektiva reningstekniker som reducerar mängden hormonstörande ämnen, eller på att utspädningen av avloppen i recipienterna är större än i många andra länder. Dock kan problemen inte helt uteslutas eftersom vissa feminiserande (estrogena) effekter kunde observeras hos fisken i de undersökta recipienterna utanför kommunala reningsverk. I kontrollerade laboratorieförsök där storpsiggar exponerades för kommunalt avloppsvatten uppmättes även här effekter som tyder på förekomst av estrogener i avloppsvattnet. De cell-baserade testsystemen klarade av att förutspå hormonella effekter hos hel fisk och kan därför vara mycket användbara i fortsatta studier av hormonstörande ämnens verkningsmekanismer i preliminära toxicitetsbedömningar.

Accessing Research Results in the Open Information Environment

Presentation at the "Tutkimus vapaaksi verkkoon!" seminar in Helsinki, January 25, 2011

Information literacy as a social phenomenon in the nursing environment

Abstrakti

Learning Robot Environment through Simulation

Traditionally simulators have been used extensively in robotics to develop robotic systems without the need to build expensive hardware. However, simulators can be also be used as a “memory”for a robot. This allows the robot to try out actions in simulation before executing them for real. The key obstacle to this approach is an uncertainty of knowledge about the environment. The goal of the Master’s Thesis work was to develop a method, which allows updating the simulation model based on actual measurements to achieve a success of the planned task. OpenRAVE was chosen as an experimental simulation environment on planning,trial and update stages. Steepest Descent algorithm in conjunction with Golden Section search procedure form the principle part of optimization process. During experiments, the properties of the proposed method, such as sensitivity to different parameters, including gradient and error function, were examined. The limitations of the approach were established, based on analyzing the regions of convergence.

Modelling of combustion and sorbent reactions in three-dimensional flow environment of a circulating fluidized bed furnace

This thesis presents a three-dimensional, semi-empirical, steady state model for simulating the combustion, gasification, and formation of emissions in circulating fluidized bed (CFB) processes. In a large-scale CFB furnace, the local feeding of fuel, air, and other input materials, as well as the limited mixing rate of different reactants produce inhomogeneous process conditions. To simulate the real conditions, the furnace should be modelled three-dimensionally or the three-dimensional effects should be taken into account. The only available methods for simulating the large CFB furnaces three-dimensionally are semi-empirical models, which apply a relatively coarse calculation mesh and a combination of fundamental conservation equations, theoretical models and empirical correlations. The number of such models is extremely small. The main objective of this work was to achieve a model which can be applied to calculating industrial scale CFB boilers and which can simulate all the essential sub-phenomena: fluid dynamics, reactions, the attrition of particles, and heat transfer. The core of the work was to develop the model frame and the required sub-models for determining the combustion and sorbent reactions. The objective was reached, and the developed model was successfully used for studying various industrial scale CFB boilers combusting different types of fuel. The model for sorbent reactions, which includes the main reactions for calcitic limestones, was applied for studying the new possible phenomena occurring in the oxygen-fired combustion. The presented combustion and sorbent models and principles can be utilized in other model approaches as well, including other empirical and semi-empirical model approaches, and CFD based simulations. The main achievement is the overall model frame which can be utilized for the further development and testing of new sub-models and theories, and for concentrating the knowledge gathered from the experimental work carried out at bench scale, pilot scale and industrial scale apparatus, and from the computational work performed by other modelling methods.

Mental Well-being at Work. A Sign of a Healthy Organisation and a Necessary Precondition for Organisational Development

One of the aims of the study was to clarify the reliability and validity of the Job Diagnostic Survey (JDS) and the Eigenzustand (EZ) method as measures of the objective characteristics of work and short-term mental work load in the Finnish data. The reliability and validity were examined taking into consideration the theoretical backgrounds of the methods and the reliability of the measurements. The methods were used for finding out the preconditions for organisational development based on self-improvement and clarifying the impacts of working environment (organisational functioning and job characteristics) on a worker’s mental state and health. The influences were examined on a general level - regardless of individual personal or specific contextual factors. One aim was also to clarify how cognitions and emotions are intertwined and how they influence a person’s perception of the working environment. The data consisted of 15 blue-collar organisations in the public sector. The organisations were divided in target and comparison groups depending on the research frames. The data was collected by questionnaires by post. The exploratory and confirmatory factor analyses (Lisrel) were used as the main statistical methods in examining the structures of the methods and impacts between the variables. It was shown that it is possible for organisations to develop their working conditions themselves on specific preconditions. The advance of the development processes could be shown by the amount of the development activity as well as by the changes of the mental well-being (ability to act) and sick absenteeism of the personnel. It was found that the JDS and the EZ methods were reliable and valid measures in the Finnish data. It was shown that, in addition to the objective working environment (organisational functioning and job characteristics), also such a personal factor as selfesteem influences a person’s perception of mental work load. However, the influence did not seem to be direct. The importance of job satisfaction as a general indicator of perceived working conditions was emphasised. Emotional and cognitive factors were found to be functionally intertwined constituting a common factor. Organisational functioning and the characteristics of work had connections with a person’s health measured by sick absenteeism.

Test Campaign Parameter Editor for a Graphical TTCN-3 Development Environment

This paper presents the design for a graphical parameter editor for Testing and Test Control Notation 3 (TTCN-3) test suites. This work was done in the context of OpenTTCN IDE, a TTCN-3 development environment built on top of the Eclipse platform. The design presented relies on an additional parameter editing tab added to the launch configurations for test campaigns. This parameter editing tab shows the list of editable parameters and allows opening editing components for the different parameters. Each TTCN-3 primitive type will have a specific editing component providing tools to ease modification of values of that type.

Kolme näkökulmaa julkisen suun terveydenhuollon toimintaan – Jyväskylän asukkaiden, päättäjien ja työntekijöiden odotukset, käsitykset ja kokemukset

Tutkimuksessa selvitettiin Jyväskylän asukkaiden, päättäjien ja suun terveydenhuollon työntekijöiden palveluodotuksia sekä niiden toteutumista Jyväskylän julkisessa suun terveydenhuollossa sekä verrattuna ympäristökuntiin. Toiseksi tutkittiin päättäjien ja suun terveydenhuollon työntekijöiden käsityksiä alan työmotivaatioon vaikuttavista tekijöistä Jyväskylässä ja ympäristökunnissa. Kolmas tutkimuskohde oli työhyvinvointi, jota selvitettiin Jyväskylässä ja seitsemässä muussa julkisessa suun terveydenhuollossa sekä Jyväskylän yksityishammaslääkäreiden vastaanotoilla. Tutkimuksen tiedot kerättiin postikyselynä, johon vastasi 1 151 asukasta, 125 päättäjää ja 388 suun terveydenhuollon työntekijää. Tulokset osoittivat, että Jyväskylän julkisen suun terveydenhuollon palvelujen järjestämisessä ei kuultu tarpeeksi kuntalaisia eikä alan ammattilaisia. Palvelut toteutuivat useammin päättäjien kuin asukkaiden ja työntekijöiden odotusten mukaisesti. Asukkaiden odotukset olivat lähempänä työntekijöiden kuin päättäjien odotuksia. Suurimmat erot olivat päättäjien ja alan ammattilaisten välillä. Jyväskylän päättäjät eivät tunteneet tarpeeksi julkisessa suun terveydenhuollossa tehtävän työn vaatimuksia eivätkä sen erityispiirteitä. Jyväskylän ja ympäristökuntien välillä asukkaiden, päättäjien ja alan ammattilaisten odotukset suun terveydenhuollon palveluista erosivat vain vähän. Sen sijaan palveluiden toteutumisessa erot olivat suuremmat. Palvelut toimivat monilta osin paremmin ympäristökunnissa kuin Jyväskylässä. Jyväskylän suun terveydenhuollon työelämän laadussa oli ongelmia ja ne olivat suuremmat kuin verrokkiterveyskeskuksissa ja Jyväskylän yksityishammaslääkäreiden vastaanotoilla. Hyvä fyysinen työympäristö sekä hyvä työajan hallinta olivat voimavaratekijöitä, jotka Jyväskylän suun terveydenhuollossa suojasivat työntekijöitä työn kuormittavuuden haitallisilta vaikutuksilta. Työelämän laadun parantaminen vaatisi erityisesti näiden voimavarojen vahvistamista. Päättäjien tulisi tiedostaa niiden vaikutus työntekijöiden työmotivaatioon ja resursoida julkista suun terveydenhuoltoa riittävästi siellä tehtävän työn vaatimuksiin nähden. Kaiken kaikkiaan suun terveydenhuollon merkitys kuntalaisten hyvinvoinnille ja elämänlaadulle pitäisi paremmin ottaa huomioon Jyväskylän julkisessa terveydenhuollossa resursseja jaettaessa sekä toimintatapoja ja palvelurakenteita uudistettaessa. Tuloksellisuus suun terveydenhuollossa edellyttäisi, että palveluja kehitettäisiin vastaamaan mahdollisimman hyvin sekä kuntalaisten että työelämän tarpeita resurssien antamissa rajoissa. Jyväskylässä tarvittaisiin asukkaiden, päättäjien ja suun terveydenhuollon työntekijöiden välillä jatkuvaa vuoropuhelua ja parempaa tiedon välittymistä. Monipuolisen tiedon perusteella päättäjät pystyisivät palveluja järjestäessään sovittamaan paremmin yhteen eri osapuolten tarpeet ja tavoitteet sekä ratkaisemaan intressiristiriitoja.

Software Security Vulnerabilities in Mobile Peer-to-peer Environment

Increase of computational power and emergence of new computer technologies led to popularity of local communications between personal trusted devices. By-turn, it led to emergence of security problems related to user data utilized in such communications. One of the main aspects of the data security assurance is security of software operating on mobile devices. The aim of this work was to analyze security threats to PeerHood, software intended for performing personal communications between mobile devices regardless of underlying network technologies. To reach this goal, risk-based software security testing was performed. The results of the testing showed that the project has several security vulnerabilities. So PeerHood cannot be considered as a secure software. The analysis made in the work is the first step towards the further implementation of PeerHood security mechanisms, as well as taking into account security in the development process of this project.

Automation Concept for Electrically Excited LV Synchronous Motor: Implementation into AC500 Programmable Logic Environment

This bachelor’s thesis is a part of the research project realized in the summer 2011 in Lappeenranta University of Technology. The goal of the project was to develop an automation concept for controlling the electrically excited synchronous motor. Thesis concentrates on the implementation of the automation concept into the ABB’s AC500 programmable logic enviroment. The automation program was developed as a state machine with the ABB’s PS501 Control Builder software. For controlling the automation program is developed a fieldbus control and with CodeSys Visualization Tool a local control with control panel. The fieldbus control is done to correspond the ABB drives communication profile and the local control is implemented with a function block which feeds right control words into the statemachine. A field current control of the synchronous motor is realized as a method presented in doctoral thesis of Olli Pyrhönen (Pyrhönen 1998). The Method combines stator flux and torque based openloop control and power factor based feedback control.