Improvement of Routine Test Process of High Voltage Power Capacitors

The capacitor test process at ABB Capacitors in Ludvika must be improved to meet future demands for high voltage products. To find a solution to how to improve the test process, an investigation was performed to establish which parts of the process are used and how they operate. Several parts which can improves the process were identified. One of them was selected to be improved in correlation with the subject, mechanical engineering. Four concepts were generated and decision matrixes were used to systematically select the best concept. By improving the process several benefits has been added to the process. More units are able to be tested and lead time is reduced. As the lead time is reduced the cost for each unit is reduced, workers will work less hours for the same amount of tested units, future work to further improve the process is also identified. The selected concept was concept 1, the sway stop concept. This concept is used to reduce the sway of the capacitors as they have entered the test facility, the box. By improving this part of the test process a time saving of 20 seconds per unit can be achieved, equivalent to 7% time reduction. This can be compared to an additional 1400 units each year.

Production and Delivery (Optimization of production system and reliability)

This thesis is done to solve two issues for Sayid Paper Mill Ltd Pakistan. Section one deals with a practical problem arise in SPM that is cutting a given set of raw paper rolls of known length and width, and a set of product paper rolls of known length (equal to the length of raw paper rolls) and width, practical cutting constraints on a single cutting machine, according to demand orders for all customers. To solve this problem requires to determine an optimal cutting schedule to maximize the overall cutting process profitability while satisfying all demands and cutting constraints. The aim of this part of thesis is to develop a mathematical model which solves this problem.Second section deals with a problem of delivering final product from warehouse to different destinations by finding shortest paths. It is an operational routing problem to decide the daily routes for sending trucks to different destination to deliver their final product. This industrial problem is difficult and includes aspect such as delivery to a single destination and multiple destinations with limited resources. The aim of this part of thesis is to develop a process which helps finding shortest path.

Financial time series analysis : Chaos and neurodynamics approach

This work aims at combining the Chaos theory postulates and Artificial Neural Networks classification and predictive capability, in the field of financial time series prediction. Chaos theory, provides valuable qualitative and quantitative tools to decide on the predictability of a chaotic system. Quantitative measurements based on Chaos theory, are used, to decide a-priori whether a time series, or a portion of a time series is predictable, while Chaos theory based qualitative tools are used to provide further observations and analysis on the predictability, in cases where measurements provide negative answers. Phase space reconstruction is achieved by time delay embedding resulting in multiple embedded vectors. The cognitive approach suggested, is inspired by the capability of some chartists to predict the direction of an index by looking at the price time series. Thus, in this work, the calculation of the embedding dimension and the separation, in Takens‘ embedding theorem for phase space reconstruction, is not limited to False Nearest Neighbor, Differential Entropy or other specific method, rather, this work is interested in all embedding dimensions and separations that are regarded as different ways of looking at a time series by different chartists, based on their expectations. Prior to the prediction, the embedded vectors of the phase space are classified with Fuzzy-ART, then, for each class a back propagation Neural Network is trained to predict the last element of each vector, whereas all previous elements of a vector are used as features.

Ökad förståelse bland företagsledare för nyttan av utvecklingsinsatser inom arbetsmiljöområdet

Sammanfattning Föreliggande rapport avser en delstudie inom projektet Attraktiv Konkurrenskraft (AKK) Syftet med detta arbete är att utvärdera fem metoder som kan ”väcka insikt” om nyttan av att starta utvecklingsaktiviteter för att bättre ta tillvara de mänskliga resurserna i arbetet. Baserat på detta ska en metod väljas för fördjupade studier. Drivkrafterna för att skapa bra arbetsmiljöer är många. Den primära kan sägas vara den humanitära drivkraften. Förutom de överväganden som ligger till grund för arbetsmiljölagstiftning och avtal mellan arbetsmarknadens parter finns alltså goda skäl för företagare att prioritera arbetsmiljöarbete. Den fråga som berörs i detta arbete är i vad mån det är möjligt att genom enkla insatser påverka en arbetsmiljöansvarig chefs benägenhet att gå till beslut om att genomföra insatser för att utveckla förutsättningarna för att bättre nyttja de mänskliga resurserna i organisationen. Målet är att chefen bestämmer sig för att påbörja en beslutsprocess om utvecklingsaktiviteter för att ta tillvara de mänskliga resurserna i arbetet vilket ökar förutsättningarna att rekrytera, behålla och engagera kompetent personal. Som resultat av förstudien har fem olika insiktsmetoder utvecklats och anpassats. Dessa metoder har kallats GAP-analys, Fokusgrupper Attraktivt Arbete, Visit, Riskanalys och Scenario. De tio företagen som deltog hade mellan 11 och 39 anställda, och deras verksamheter var inom områdena tillverkning, reparation och underhåll. Resultat från användning av metoderna visar att alla metoderna uppfyller kriterierna att vara enkla att förstå och snabba att genomföra. Fokusgrupper, Visit och Riskanalys ger konkret vägledning för fortsatt utvecklingsarbete. Fokusgrupper ger ett brett underlag för en fortsättning som bygger på dialog, en djupare analys på individnivå samt har psykiska och sociala dimensioner. Därmed sågs Fokusgrupper som den mest intressanta metoden att gå vidare med. Denna studie indikerar att det finns möjlighet att påverka ledare att ta beslut om aktiviteter för att utveckla den mänskliga resursen. Det finns därmed anledning att ytterligare studera ett antal företag där en och samma metod används. Valet har fallit på Fokusgrupper, även om andra metoder skulle vara tänkbara. Abstract This report concerns a sub-study of the project attractive competitiveness (AKK). The aim of the work is to evaluate five methods that are supposed to” raise awereness” about the advantages of initiating activities to better utilize human resources at work. Based on that shall one method be elected for depend studies. The driving forces for creation of good work environments are many. The primary can be said to be the humanitarian driving force. Except for the considerations that are behind the work environment legislations and agreements between social partners is therefore good reasons for entrepreneurs to give priority to work environment work. The focus of this study is to which extent it is possible by a limited input influence the liability of a manager with responsibilities for the work environment to take decisions to start a process aimed at improving the use of the human resources in the company. The goal is that the manager decides to start such a process which also is supposed to recruit, retain and engage competent staff. In the sub-study have five insight methods been developed or adapted. Those methods have been named gap-analysis, focus groups attractive work, visit, risk analysis, and scenario. The ten participating companies employed between eleven and thirty-nine persons. The companies represented different branches as production, repair work and maintenance. The results from the test of the methods shows that they all meet the criteria’s to be simple to understand and quick to carry through. Focus groups attractive work, visit, and risk analysis gives substantial guidance for further development work. Focus groups attractive work gives a broad base for a continuation built on a dialogue, a deeper analyses of individual level as well as mental and social dimensions. Of that reason chosen for deepened studies. This study indicates that there are possibilities to influence managers to decide about activities aimed at better use of human resources. There are therefore reasons to make further studies in a number of companies where the elected method is used.

Simulation of Photovoltaic Panel Production as Complement to Ground Source Heat Pump System

This master thesis presents a new technological combination of two environmentally friendly sources of energy in order to provide DHW, and space heating. Solar energy is used for space heating, and DHW production using PV modules which supply direct current directly to electrical heating elements inside a water storage tank. On the other hand a GSHP system as another source of renewable energy provides heat in the water storage tank of the system in order to provide DHW and space heating. These two sources of renewable energy have been combined in this case-study in order to obtain a more efficient system, which will reduce the amount of electricity consumed by the GSHP system.The key aim of this study is to make simulations, and calculations of the amount ofelectrical energy that can be expected to be produced by a certain amount of PV modules that are already assembled on a house in Vantaa, southern Finland. This energy is then intended to be used as a complement to produce hot water in the heating system of the house beside the original GSHP system. Thus the amount of electrical energy purchased from the grid should be reduced and the compressor in the GSHP would need fewer starts which would reduce the heating cost of the GSHP system for space heating and providing hot water.The produced energy by the PV arrays in three different circuits will be charged directly to three electrical heating elements in the water storage tank of the existing system to satisfy the demand of the heating elements. The excess energy can be used to heat the water in the water storage tank to some extent which leads to a reduction of electricity consumption by the different components of the GSHP system.To increase the efficiency of the existing hybrid system, optimization of different PV configurations have been accomplished, and the results are compared. Optimization of the arrays in southern and western walls shows a DC power increase of 298 kWh/year compared with the existing PV configurations. Comparing the results from the optimization of the arrays on the western roof if the intention is to feed AC power to the components of the GSHP system shows a yearly AC power production of 1,646 kWh.This is with the consideration of no overproduction by the PV modules during the summer months. This means the optimized PV systems will be able to cover a larger part of summer demand compared with the existing system.

On statistical bounds of heuristic solutions to location problems

Solutions to combinatorial optimization problems, such as problems of locating facilities, frequently rely on heuristics to minimize the objective function. The optimum is sought iteratively and a criterion is needed to decide when the procedure (almost) attains it. Pre-setting the number of iterations dominates in OR applications, which implies that the quality of the solution cannot be ascertained. A small, almost dormant, branch of the literature suggests using statistical principles to estimate the minimum and its bounds as a tool to decide upon stopping and evaluating the quality of the solution. In this paper we examine the functioning of statistical bounds obtained from four different estimators by using simulated annealing on p-median test problems taken from Beasley’s OR-library. We find the Weibull estimator and the 2nd order Jackknife estimator preferable and the requirement of sample size to be about 10 being much less than the current recommendation. However, reliable statistical bounds are found to depend critically on a sample of heuristic solutions of high quality and we give a simple statistic useful for checking the quality. We end the paper with an illustration on using statistical bounds in a problem of locating some 70 distribution centers of the Swedish Post in one Swedish region. 

Självet, rollerna och pågående koordinationer av mänskliga handlingar : Om att försöka se ’samhället’ som något annat än fängelse eller marionetteater

The self, roles and the ongoing coordination of human action. Trying to see ‘society’ as neither prison nor puppet theatre In the article it is argued that structural North-American role-sociology may be integrated with theories emphasizing ‘society’ as ongoing processes (f. ex. Giddens’ theory of structuration). This is possible if the concept of role is defined as a recurrence oriented to the action of others standing out as a regularity in a societal process. But this definition makes it necessary to in a fundamental way understand what kind of social being the role-actor is. This is done with the help of Hans Joas’ theory of creativity and Merleau-Pontys concept of ‘flesh’ arguing that Meads concept of the ‘I’ maybe understood as an embodied self-asserting I, which at least in reflexive modernity has the creative power to split Meads ‘me’ into a self-voiced subject-me and an other voiced object-me. The embodied I communicating with the subject-me may be viewed as that role-actor which is something else than the role played. But this kind of role-actor is making for new troubles because it is hard to understand how this kind of self is creating self-coherence by using Meads concept of ‘the generalized other’. This trouble is handled by using Alain Touraines concept of the ‘subject’ and arguing that the generalized other is dissolving in de-modernized modernity. In split modernity self-coherence may instead be created by what in the article is called the generalized subject. This concept means a kind of communicative future based evaluation, which has its base in the ‘subject’ opposing the split powers of both the instrumentality of markets and of life-worlds trying to create ‘fundamentalistic’ self-identities. This kind of self is communicative because it also must respect the other as ‘subject’. It exists only in the battle against the forces of the market or a community. It never constructs an ideal city or a higher type of individual. It creates and protects a clearing that is constantly being invaded, to use the words of the old Frenchman himself. Asa kind of test-case it is by the way in the article shown how Becks concept of individualization may be understood in a deeply social and role-sociological way.

To speak or not to speak English during English lessons : A literature study on language use in the elementary classroom

There are different views regarding which language should be used in the second language classroom. Therefore, the aim of this literature review is to find out if the teachers’ choice of language use in the classroom can affect the students’ motivation to speak English and if there are other factors that can affect the teachers’ choice of language use. This study is based on six different sources who all have investigated the use of the first language and/or the target language in schools in different parts of the world. The results of this study show that both the use of the first language and the target language can affect the students’ motivation to speak English. The results also show that there are many different factors that can affect the teachers’ choice of language in the classroom, apart from motivation. These factors include the use of the first or the target language to ensure comprehension, encourage communication, create and maintain relationships between teachers and students, keep up a good classroom climate, and to uphold discipline. There are arguments both for using the first language and the second language in the second language classroom and it is difficult to determine which language is the best to use. However, what can be determined is that it is the teachers’ responsibility to decide and to have a reason for choosing one language or the other.

¿Neurodidáctica aplicada? : Una investigación sobre las aplicaciones de la neurodidáctica en la enseñanza de español y en concreto en el libro de texto Caminando 3.

This thesis analyzes the teaching material Caminando 3 from a neurodidactic perspective. The discipline of neurodidactics is young and controversial and the aim of this investigation is to present an understanding of the use of practical applications of neurodidactics in written material of education in Spanish as a second language. The methods applied are a quantitative and objective analysis of measurable aspects in Caminando 3 and a qualitative, subjective analysis which is interpreting fundamental understandings of language learning which Caminando 3 reflects in its structure and content. The results show that there are several aspects in Caminando 3 which are supported by the evidences and advices of the neurodidactic theories and simultaneously there are details in exercises and parts of the layup containing a level of repetition and prediction which are directly harmful to the process of acquisition, according to neurodidactic theories. The conclusion is that a more dynamic teaching book can be produced with guidelines that can be created using these results. Further investigations will have to measure the knowledge and success of the pupils to decide whether neurodidactics is a successful complement to traditional didactics of second language learning.