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  • 1.
    Andersson, Jonas
    et al.
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Statistics.
    Christoffersson, Anders
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Statistics.
    Exploratory analysis of intradaily stock returns: a semi Markov chain approach2004Report (Other academic)
    Abstract [en]

    In this paper, we study the intradaily distributional and temporal properties of the IBM stock in the time period November 1990 until February 1991. We do this by exploratory analysis by means of semi Markov chains, i. e. a Markov chain where time between events is considered random. Furthermore, the behaviour of the methods is studied under some commonly used models.

  • 2.
    Andersson, Jonas
    et al.
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Statistics.
    Newbold, Paul
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Statistics.
    Modeling the distribution of financial returns by functional data analysis2002Report (Other academic)
    Abstract [en]

    In this paper, we use functional data analysis to model a time varying unconditional distribution of financial intraday returns. This is in the spirit of the recent development of realized volatility modeling (e.g. Andersen et al, 2001), where one of the moments of this unconditional distribution, the realized volatility, is assumed to change smoothly over time. In the approach used in this paper we instead assume that the entire distribution function changes smoothly over time. This enables us to study auto- and cross dependencies of different parts of the unconditional distribution with no model assumptions but the smoothness of the distribution function. We develop a simulation based procedure for statistical inference of the model. Finally, we apply the method to the Swiss Franc-US Dollar exchange rate 1985-1991.

  • 3.
    Andersson, Jonas
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Information Science.
    Ågren, Anders
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Information Science.
    The fourth order moments of volatility models with measurement errors2000Report (Other academic)
  • 4.
    Blondel, Ylva Isabelle
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Peace and Conflict Research.
    The Power of Symbolic Power: An Application of O'Neill's Game of Honour to Asymmetric Internal Conflict2004Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Powerful states can lose wars to militarily weaker opponents. This can only be understood by moving away from an over-simplified traditional definition of power and by incorporating the symbolic dimensions of power. The present study focuses on honour, which is one facet of symbolic power that is particularly relevant for understanding conflict because it is often associated with publicly participating in violence. Barry O’Neill’s Game of Honour model, originally developed for inter-state relations, provides a structured framework to analyse the strategic use of symbols in internal asymmetric conflicts. The main claim in this dissertation is that because there is only one recognised state apparatus competition is always for the same audience. I argue that this makes it difficult to assume that the state can adequately foresee the audience’s expectations, and that outcomes of a challenge can best be understood as the relative honour of the primary actors. Two cases were selected from the recent conflict in Algeria to empirically apply the model. The first is a public demonstration that occurred in Algiers in 1991 and involves a domestic news media audience, while the second is a plane hijacking that involves a Western news media audience. Six other cases are also considered with the aim of highlighting salient issues relevant to incorporating other dimensions of symbolic power connected, but not equal, to honour. The application of the model to the cases clearly reflects that symbolic challenges can be perceived as serious threats to actors who are militarily far superior. This suggests that key events can alter the relative power balance in asymmetric conflicts and, therefore, it is not possible to assume that symbolic power is merely a reflection of underlying material capabilities as a traditional definition of power implies.

  • 5.
    Fredriksson, Magnus
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Pallas, Josef
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Med synlighet som ledstjärna: En analys av vilka principer som styr kommunikationsarbetet i nationella förvaltningsmyndigheter2013Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Svenska myndigheter lägger stor vikt vid kommunikation. Många har särskilda kommunikationsavdelningar och i mer än 65 procent av organisationerna sitter kommunikationsdirektören, eller motsvarande, med i myndighetens ledningsgrupp. Som kollektiv är myndigheter bland de största köparna av tjänster från reklambyråer och kommunikationskonsulter, och informatörer anställda i offentlig sektor utgör en betydande majoritet av medlemmarna i branschorganisationen Sveriges kommunikatörer. Samtidigt vet vi relativt lite om hur myndigheter ser på, och förhåller sig till, sin kommunikation som ett medel för att genomföra sina uppdrag.

    Syftet med analysen som presenteras här är att kartlägga vilka principer som styr myndigheters kommunikationsarbete för att på så vis belysa och åtminstone delförklara de olika problem som det pekas på i myndigheters kommunikation. Vad vi söker svar på är fyra frågor:

    1. Vilka principer styr myndigheters kommunikationsarbete?
    2. Vad innebär olika principer för hur man ser på när, var, hur, med vem och varför myndigheter ska kommunicera?
    3. I vilken utsträckning och på vilket sätt står olika principer i konflikt med varandra sett utifrån ett kommunikationsperspektiv?
    4. I vilken utsträckning och på vilket sätt medvetandegörs och hanteras dessa konflikter i strategi- och styrdokument?

    Utgångspunkten är att myndigheters verksamheter – på samma sätt som andra typer av organisationer – utöver lagar, regler och förordningar, också styrs av normer och principer som beskriver vad som är rätt, vad som är fel, vad som är viktigt, vad man ska sträva efter och på så vis skapar mening i det arbete man utför. Principernas kraft ligger i att det är konstruerade på samhällsnivå och många gånger för givet tagna. Organisationer reflekterar inte över dem, de är självklara.

    Principerna förekommer på olika nivåer i samhället och de kan knytas till yrkesgrupper, sektorer och branscher men det är också fullt möjligt att peka ut ett mindre antal principer som fungerar i mycket bredare samhällssammanhang och som därför är allomfattande. I analysen utgår vi ifrån Boltanski och Thévenot (2006) som skiljer ut sex principer; kreativitet, tradition, ryktbarhet, det civila, marknaden och produktionen. Tidigare studier visar att en organisation ytterst sällan styrs utifrån en enda princip. Det är snarare regel än undantag att en och samma organisation tvingas hantera att olika principer ställs mot varandra.

    För att besvara frågorna har vi analyserat myndigheters styrdokument för kommunikation. Inledningsvis tillfrågades samtliga nationella förvaltningsmyndigheter enligt SCB:s förteckning (N=252) om de hade sådana dokument. 173 myndigheter återkom med totalt 357 dokument bland annat profilmanualer, kommunikationspolicys, kommunikationsstrategier med mera. Bakgrunden till valet av styrdokument som material är att det är texter av argumenterande karaktär där myndigheterna beskriver när, var, hur, med vem och varför man ska kommunicera. Vilket också på så vis synliggör – explicit eller implicit – vilka principer myndigheter tar utgångspunkt i för sitt kommunikationsarbete.

     

    Resultaten visar att det är fyra principer som framträder i myndigheternas dokument:

    • Ryktbarhetens principer (85 procent av myndigheterna) – att kommunikationen ska uttrycka myndighetens identitet, göra den synlig, påverka bilden av organisationen och skapa förtroende.
    • Produktionens principer (82 procent av myndigheterna) – att kommunikationen ska bidra till verksamhetens måluppfyllelse, vara välordnad, planerad och strategisk och koordinera verksamheten.
    • Det civilas principer (65 procent av myndigheterna) - att kommunikationen ska fungera som samhällsinformation, ge upplysning och service till medborgare, underlätta för journalisters granskning och faktasökande och redovisa resultat till uppdragsgivare. På så vis ska kommunikationen understödja samhällets demokratiska processer.
    • Marknadens principer (22 procent av myndigheterna) - att kommunikationen ska positionera myndigheten och generera försäljning och utbyten mellan myndigheten och kunder. I första hand en princip som framträder i dokumenten från universitet och högskolor.
    • Kreativitetens och traditionens principer förekommer inte i materialen från någon myndighet.

    Resultaten visar också att en betydande majoritet (84 procent) av myndigheterna söker stöd i mer än en princip och därför har att hantera olika typer av konflikter. I vissa fall är det högst påtagliga skillnader som också görs explicita som när det civilas ställs mot ryktbarhetens principer. Att vara fullständigt öppen och samtidigt sträva efter att presentera en uteslutande och tillrättalagd bild innebär stora svårigheter. Här finns många exempel på myndigheter som försöker upprätta en gräns för när anställda får kommunicera med omvärlden och vad de kan uttala sig om, samtidigt som de (ofta myndigheters ledning) försöker göra tydligt att detta inte inskränker meddelarskyddet eller offentlighetsprincipen.

    I andra fall är konflikterna mindre påtagliga - och ter sig sannolikt mindre bekymrande i praktiken - som när myndigheter ställer ryktbarhetens mot marknadens principer. I många sammanhang är ett starkt varumärke intimt förknippat med att stärka sin marknadsposition och på så vis bidra till en ökad försäljning (eller rekrytering av studenter).

  • 6.
    Håkansson, Anne
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Human-Computer Interaction.
    An expert system for the environmental impact assessment method2004Report (Other academic)
    Abstract [en]

    In this paper an expert system for environmental impact assessment, known as the EIA-system, is presented. This system provides advice for hydropower development and river regulation projects. It is based on a method used for assessing the impact that hydropower development and river regulation will have on the environment, called the Environmental Impact Assessment (EIA) Method (Strömquist & Tatham, 1992). Knowledge relating to the entire project is required with this method to enable a stepwise approach to be adopted for the assessment. Since people in developing countries lack knowledge about the impact a project will have on the environment, as well as expertise and resources, an expert system should be invaluable to assist the end users in their decision-making regarding the impact hydropower development and river regulation projects will have.

    The EIA-system was developed to provide advisory and educational support for end users using the EIA method within developing countries. The system has to be appealing to use and, moreover, it must motivate the users to utilise it and thereby the EIA method within political settings disinterested in environmental concerns. Furthermore, the system needs to be useable and comprehensible to the end users. To realise these requirements, a logic programming language was utilised together with hypermedia technology. Briefly, the logic programming language formalises the domain knowledge and the inference mechanism. The hypermedia technology used a multimedia system to constitute the user interface and to convey domain specific information and explanation facilities.

  • 7.
    Iqbal, Yasir
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Exploring the uses of information andcommunication technology in open innovation2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 8.
    Karlsson, Andreas
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Information Science.
    Bootstrap Methods for Bias Correction and Confidence Interval Estimation for Nonlinear Quantile Regression of Longitudinal Data2006Report (Other academic)
    Abstract [en]

    This paper examines the use of bootstrapping for bias correction and confidence interval calculations for a weighted nonlinear quantile regression estimator, adjusted to the case of longitudinal data. Different weights, bootstrap methods and types of confidence intervals are used and compared by computer simulation using a four-parameter logistic growth function and error terms following an AR(1) model. Finally the methods are applied to a data set with growth patterns of two genotypes of soybean. It is found that the bias correction reduces the bias, but has the disadvantage of increasing the risk of getting crossing quantile regression curves, and that the bootstrap percentile method and the normal approximation method perform well when used without bias correction. When increasing the autocorrelation in the AR(1) model, the length of the confidence intervals decreases

  • 9.
    Karlsson, Andreas
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Information Science, Statistics.
    Quantile regression estimation of nonlinear longitudinal data2004Report (Other academic)
    Abstract [en]

    This paper examines a weighted version of the quantile regression estimator defined by Koenker and Bassett (1978), adjusted to the case of nonlinear longitudinal data. Different weights are used and compared by computer simulation using a four-parameter logistic growth function and error terms following an AR(1) model. It is found that the estimator is performing quite well, especially for the median regression case, that the differences between the weights are small, and that increasing the correlation in the AR(1) model leads to better behaviour of the estimator. A comparison is made with the corresponding mean regression estimator, which is found to be less robust. Finally the estimator is applied to a data set with growth patterns of two genotypes of soybean.

  • 10.
    Pettersson, Therese
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Peace and Conflict Research.
    Pillars of Strength: External Support to Warring Parties2011In: States in Armed Conflict 2010 / [ed] Therése Pettersson & Lotta Themnér, Uppsala: Department of Peace and Conflict Research , 2011, p. 41-60Chapter in book (Other academic)
  • 11.
    Pettersson, Therése
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Peace and Conflict Research.
    Themnér, LottaUppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Peace and Conflict Research.
    States in Armed Conflict 20092010Collection (editor) (Other academic)
  • 12.
    Thong, Dang-Nguyen
    et al.
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Human-Computer Interaction.
    Tavanti, Monica
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Human-Computer Interaction.
    Ha, Le-Hong
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Human-Computer Interaction.
    Vu, Duong
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Information Science, Human-Computer Interaction.
    3D stereo displays for air traffic control: a multidisciplinary framework and some results2004Report (Other academic)
    Abstract [en]

    The Virtual Sky project attempts to investigate the applicability of three-dimensional stereoscopic display for AirTraffic Control. This investigation is quite complex in that it requires several disciplines to be studied in parallel. For instance, we decided to use a multidisciplinary approach, which is made of three related components: “Visualization”,“Interaction” and “Human Factors”. This paper describes the framework of the investigation and provides the analysis’details for each component involved. Moreover, we present some preliminary results involving Air Traffic Controllersand entailing their training with a special Interaction device.

  • 13.
    Tärnlund, Sten-Åke
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media, Information Systems.
    P is not equal to NP2013Report (Other academic)
    Abstract [en]

    The problem of computing whether any formula of propositional logic is satisfiable is not in P. Therefore, P is not equal to NP. The proofs are informal about formal proofs in a first-order theory B axiomatizing Turing’s theory of computing. However, the informal proofs can be converted into formal proofs in Hilbert’s proof theory, and proved using a theorem prover.

  • 14.
    Tärnlund, Sten-Åke
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    P is not equal to NP2017Report (Other academic)
    Abstract [en]

    SAT is not in P is proved, in a first-order theory, with a new single finite axiom of Turing’s theory of computing. So, P is not equal to NP.

  • 15.
    Tärnlund, Sten-Åke
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    P is not equal to NP2017Report (Other academic)
    Abstract [en]

    SAT  is not in  P  is proved, in a first-order theory, with a new single finite axiom of Turing's theory of computing. So, P  is not equal to NP.

  • 16.
    Tärnlund, Sten-Åke
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media, Information Systems.
    Verifying that P is not equal to NP using a theorem prover2013Report (Other academic)
    Abstract [en]

    The  problem  of computing whether any formula  in propositional logic is satisfiable is not  in P .  Therefore, P  is not  equal  to  NP .  In the first- order theory B, axiomatizing Turing’s theory of computing, three versions of the proofs  are  presented.  First, an  informal  (conceptual)  proof  about formal  proofs.    Second,  a  more  formal  proof  in  Hilbert’s  proof  theory. Third, a formal  proof in Hilbert’s proof theory, using  a theorem prover.

  • 17.
    Tärnlund, Sten-Åke
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Verifying that P is not equal to NP using a theorem prover2012Report (Other academic)
  • 18.
    Wallentin, Bo
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Information Science.
    Ågren, Anders
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Information Science, Statistics.
    Test of autocorrelation and heteroscedasticity in a regression model in the presence of measurement errors2000Report (Other academic)
1 - 18 of 18
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