1,721,073 research outputs found
Kanban: periaatteita ja kokemuksia
No full textKoski, Timo
Kanban: periaatteita ja kokemuksia
Jyväskylä: Jyväskylän yliopisto, 2012, 49 s.
Tietojärjestelmätiede, kandidaatin tutkielma
Ohjaaja(t): Leppänen, Mauri
Markkinat asettavat ohjelmistoliiketoiminnalle yhä kasvavia haasteita. Erityi-sesti markkinoille tulon nopeus (time-to-market) on noussut liiketoiminnan kannalta hyvin tärkeäksi. Ohjelmistoliiketoiminta on omaksunut ketterät kehit-tämismenetelmät osaksi sen ydintä, mutta niidenkin käytössä on havaittu tiet-tyjä rajoitteita ja ongelmia.
Kanban on uusi, toisen sukupolven ketterän kehittämisen tapa, joka tuo Lean-periaatteet ohjelmistokehitykseen. Kanbanin avulla ohjelmistokehitys pyrkii voittamaan ongelmat, jotka ensimmäisen sukupolven ketterissä menetelmissä on havaittu ja vastaamaan markkinoiden sille asettamiin haasteisiin.
Tässä tutkimuksessa esitellään aluksi ensimmäisen sukupolven ketterien mene-telmien keskeisiä periaatteita ja pohditaan niiden ongelmia. Tämän jälkeen pe-rehdytään tarkemmin Kanbanista esitettyihin tulkintoihin ja pyritään muodos-tamaan niistä kattava synteesi. Lopuksi kerrotaan Kanbanin käyttöstä kolmen tapaustutkimuksen avulla ja eritellään käytöstä saatuja hyötyjä.
Tämän tutkimuksen perusteella Kanbanin keskeiset periaatteet ovat työnkulun visualisointi, käynnissä olevien töiden määrän rajoittaminen ja prosessin jatku-va kehittäminen. Tutkimuksessa läpikäytävien tapaustutkimusten perusteella Kanbanin käytöstä voidaan myös erottaa selkeitä hyötyjä.unknown accessibilityei tietoa saavutettavuudest
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
On deltamodulators for Gauss-Markov-processes : a normal approximation
No full textThe author studies the properties of deltamodulators for signals consisting of sample paths of a time-continuous Gauss-Markov-process (source). The deltamodulator output is a (square integrable) functional of the source path, which implies a representation (decomposition) in terms of a stochastic integral. From this representation one finds the conditional expectation and the variance of any decoded variable. Using the properties of such deltamodulators, it becomes possible to provide a normal approximation for the decoded output. In addition, various types of errors, which are known as pointwise approximation error, pointwise prediction error, pointwise predicted error and overload slope error, are described.</p
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Lectures at RNI on Probabilistic Models and Inference for Phylogenetics
No full textThe core of these lecture notes corresponds to the contents of a series of seminars held during November-December, 2003, at the Division of Biometry of the Rolf Nevanlinna Institute (RNI) (a research institute of mathematics, computer science and statistics, University of Helsinki). The seminars were organized within the “Centre of Population Genetic Analyses” at RNI. The centre is funded by a grant from the Academy of Finland. The author thanks Professor Elja Arjas, head of the Division of Biometry, for the invitation to give these lectures and for several comments that have improved both the contents and of the presentation. The original impetus for the studies underlying these notes was to understand certain issues in bacterial taxonomy (see e.g., Busse et.al. 1996, Gaunt et.al. 2001, Mougel et.al. 2002, Van de Peer et.al. 1993) especially when construction hidden Markov models using Hobohnm algorithm for preprocessing of sequence data. The benefit of these lectures for their audience might be to have been exposed to many of the concepts and models that are being mentioned in the section on methods of a biological research paper like, e.g., (Gaunt et.al. 2001), and applied there, or in documents like PAML Manual (Yang 2002), MrByes Manual (Huelsenbeck and Ronquist 2001), and others. The current version of the notes is not final; several additional sections and chapters are under construction. One obvious shortcoming of this version is that every item in the Bibliography is not necessarily referred to in the text. Some of the figures in the text have a sketchy standard
Lectures at RNI on probabilistic models and inference for phylogenetics
No full textThe core of these lecture notes corresponds to the contents of a series of seminars held during November-December, 2003, at the Division of Biometry of the Rolf Nevanlinna Institute (RNI) (a research institute of mathematics, computer science and statistics, University of Helsinki). The seminars were organized within the “Centre of Population Genetic Analyses” at RNI. The centre is funded by a grant from the Academy of Finland.The author thanks Professor Elja Arjas, head of the Division of Biometry, for the invitation to give these lectures and for several comments that have improved both the contents and of the presentation.The original impetus for the studies underlying these notes was to understand certain issues in bacterial taxonomy (see e.g., Busse et.al. 1996, Gaunt et.al. 2001, Mougel et.al. 2002, Van de Peer et.al. 1993) especially when construction hidden Markov models using Hobohnm algorithm for preprocessing of sequence data.The benefit of these lectures for their audience might be to have been exposed to many of the concepts and models that are being mentioned in the section on methods of a biological research paper like, e.g., (Gaunt et.al. 2001), and applied there, or in documents like PAML Manual (Yang 2002), MrByes Manual (Huelsenbeck and Ronquist 2001), and others.The current version of the notes is not final; several additional sections and chapters are under construction. One obvious shortcoming of this version is that every item in the Bibliography is not necessarily referred to in the text. Some of the figures in the text have a sketchy standard.</p
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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