1,721,002 research outputs found
Polygonizing Implicit Surfaces in a Purely Functional Way
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Functional web applications : implementation and use of client side interpreters
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76553.pdf (Publisher’s version ) (Open Access)The Internet has become a prominent platform for the deployment of computer applications. Web-browsers are an important interface for e-mail, on-line shopping, and banking applications. Despite this popularity, the development of web applications is a difficult job through their complex client-server structure. Web applications use client-side processing to speed up their performance. This is often realized by using an interpreter at the browser side. This complicates the development of web applications even more. The programmer has to develop code for both server and client and these parts should co-operate closely to obtain the desired result.
Functional programming languages like Haskell and Clean are a promising development platform for web applications. They support higher order functions that enable a high level of compositional programming where irrelevant details can be hidden for the developer. They support generic programming techniques for automatic generation and handling of web forms, interaction with data sources and server-client communication. An important example of this approach is the iTask system. iTask is a declarative domain specific language embedded in Clean, enabling the creation of dynamic workflow applications. iTask workflows consist of a combination of tasks to be performed by humans and/or automated processes. From iTask specifications complete web-based workflow applications are generated. iTask is built on a single, powerful, concept: the task. iTask uses combinators to combine tasks into new tasks. With combinators tasks can be executed sequentially or in parallel using or- and- or ad-hoc parallelism. The main object of study in this thesis is the extension of iTask with client-side processing while maintaining the declarative nature of the system and the generation of the application from one Clean source. For this a dedicated client-side Clean platform is developed in combination with a mechanism to move processing from server to client.
This thesis also contains an initial study of applications of iTask in the domains of Military and Crisis-Management Operations.RU Radboud Universiteit Nijmegen, 08 juli 2010Promotor : Plasmeijer, M.J. Co-promotor : Koopman, P.W.M.167 p
Beautiful workflows : a matter of taste?
No full textWorkflows can be specified using different languages. Mainstream workflow management systems predominantly use procedural languages having a graphical representation involving AND/XOR splits and joins (e.g., using BPMN). However, there are interesting alternative approaches. For example, case handling approaches are data-driven and allow users to deviate within limits, and declarative languages based on temporal logic (where everything is allowed unless explicitly forbidden). Recently, Rinus Plasmeijer proposed the iTask system (iTasks) based on the viewpoint that workflow modeling is in essence a particular kind of functional programming. This provides advantages in terms of expressiveness, extendibility, and implementation efficiency. On the occasion of his 61st birthday, we compare four workflow paradigms: procedural, case handling, declarative, and functional. For each paradigm we selected a characteristic workflow management system: YAWL (procedural), BPM|one (case handling), Declare (declarative), and iTasks (functional). Each of these systems aims to describe and support business processes in an elegant manner. However, there are significant differences. In this paper, we aim to identify and discuss these differences.
Keywords: Workflow Management; Business Process Management; Case Handling; Declarative Languages; Functional Programmin
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
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
Functional programs as executable specifications
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mmubn000001_114677735.pdf (Publisher’s version ) (Open Access)Promotores : H. Barendregt en M. Plasmeijer208 p
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
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