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  • 251.
    Alonso, Juan
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Abrahamsson, Henrik
    RISE., Swedish ICT, SICS, Decisions, Networks and Analytics lab.
    Ahlgren, Bengt
    RISE., Swedish ICT, SICS, Decisions, Networks and Analytics lab.
    Andersson, Anders
    RISE - Research Institutes of Sweden, ICT, SICS.
    Kreuger, Per
    RISE., Swedish ICT, SICS, Decisions, Networks and Analytics lab.
    Objective Functions for Balance in Traffic Engineering2002Rapport (Övrigt vetenskapligt)
    Abstract [en]

    We prove a result concerning objective functions that can be used to obtain efficient and balanced solutions to the multi-commodity network flow problem. This type of solution is of interest when routing traffic in the Internet. A particular case of the result proved here (see Corollary 2 below) was stated without proof in a previous paper.

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  • 252.
    Alonso, Juan
    et al.
    RISE., Swedish ICT, SICS.
    Dunkels, Adam
    RISE., Swedish ICT, SICS.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Bounds on the energy consumption of routings in wireless sensor networks2004Konferensbidrag (Refereegranskat)
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  • 253.
    Alonso, Juan
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Dunkels, Adam
    RISE., Swedish ICT, SICS.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Bounds on the Energy Consumption of Routings in Wireless Sensor Networks2003Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Energy is one of the most important resources in wireless sensor networks. We use an idealized mathematical model to study the impact of routing on energy consumption. Our results are very general and, within the assumptions listed in Section 2, apply to arbitrary topologies, routings and radio energy models. We find bounds on the minimal and maximal energy routings will consume, and use them to bound the lifetime of the network. The bounds are sharp, and can be achieved in many situations of interest. We illustrate the theory with some examples.

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  • 254. Alonso, Juan
    et al.
    Dunkels, Adam
    RISE., Swedish ICT, SICS.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Bounds on the Lifetime of Wireless Sensor Networks2004Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Energy is one of the most important resources in wireless sensor networks. We use an idealized mathematical model to study the energy consumption under all possible routings. Our results are very general and, within the assumptions listed in Section 2, apply to arbitrary topologies, routings and radio energy models. We find bounds on the minimal and maximal energy routings will consume, and use them to bound the lifetime of the network. The bounds are sharp, and we show that they are achievable in many situations of interest. We give some examples, and apply the theory to the problem of covering a given square region with the most efficient member of a family of increasingly more dense square-lattice sensor networks. Finally, we use simulations to test these results in a more realistic scenario, where packet loss can occur.

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  • 255.
    Alonso, Juan
    et al.
    RISE., Swedish ICT, SICS.
    Hermiller, Susan M.
    Homological finite derivation type2003Ingår i: International journal of algebra and computation, ISSN 0218-1967, Vol. 13, nr 3, s. 341-359Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In 1987, Squier defined the notion of finite derivation type for a finitely presented monoid. To do this, he associated a 2-complex to the presentation. The monoid then has finite derivation type if, modulo the action of the free monoid ring, the 1-dimensional homotopy of this complex is finitely generated. Cremanns and Otto showed that finite derivation type implies the homological finiteness condition left FP3, and when the monoid is a group, these two properties are equivalent. In this paper we define a new version of finite derivation type, based on homological information, together with an extension of this finite derivation type to higher dimensions, and show connections to homological type FPn for both monoids and groups.

  • 256. Alonso, Juan
    et al.
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Varshney, Ambuj
    Bounds on the Lifetime of WSNs2013Konferensbidrag (Refereegranskat)
  • 257. Alonso, Omar
    et al.
    Kamps, Jaap
    Karlgren, Jussi
    RISE, Swedish ICT, SICS.
    Fourth workshop on Exploiting Semantic Annotations in Information Retrieval (ESAIR)2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    There is an increasing amount of structure on the Web as a result of modern Web languages, user tagging and annotation, and emerg- ing robust NLP tools. These meaningful, semantic, annotations hold the promise to significantly enhance information access, by enhancing the depth of analysis of today’s systems. Currently, we have only started exploring the possibilities and only begin to un- derstand how these valuable semantic cues can be put to fruitful use. Unleashing the potential of semantic annotations requires us to think outside the box, by combining the insights of natural lan- guage processing (NLP) to go beyond bags of words, the insights of databases (DB) to use structure efficiently even when aggregating over millions of records, the insights of information retrieval (IR) in effective goal-directed search and evaluation, and the insights of knowledge management (KM) to get grips on the greater whole. This workshop aims to bring together researchers from these dif- ferent disciplines and work together on one of the greatest chal- lenges in the years to come. The desired result of the workshop will be to gain concrete insight into the potential of semantic an- notations, and in concrete steps to take this research forward; to synchronize related research happening in NLP, DB, IR, and KM, in ways that combine the strengths of each discipline; and to have a lively, interactive workshop where every participant contributes actively and which inspires attendees to think freely and creatively, working towards a common goal.

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  • 258.
    Alonso-Fernandez, Fernando
    et al.
    Halmstad University, Sweden.
    Bigun, Josef
    Halmstad University, Sweden.
    Englund, Cristofer
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Expression Recognition Using the Periocular Region: A Feasibility Study2019Ingår i: Proceedings - 14th International Conference on Signal Image Technology and Internet Based Systems, SITIS 2018, Institute of Electrical and Electronics Engineers Inc. , 2019, s. 536-541Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper investigates the feasibility of using the periocular region for expression recognition. Most works have tried to solve this by analyzing the whole face. Periocular is the facial region in the immediate vicinity of the eye. It has the advantage of being available over a wide range of distances and under partial face occlusion, thus making it suitable for unconstrained or uncooperative scenarios. We evaluate five different image descriptors on a dataset of 1,574 images from 118 subjects. The experimental results show an average/overall accuracy of 67.0/78.0% by fusion of several descriptors. While this accuracy is still behind that attained with full-face methods, it is noteworthy to mention that our initial approach employs only one frame to predict the expression, in contraposition to state of the art, exploiting several order more data comprising spatial-temporal data which is often not available.

  • 259.
    Alonzo, Ylva
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi.
    Henriksson, Gunilla
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi.
    Rapport från projektet Hästgödsel i kretslopp - Sjuhärad2016Rapport (Övrigt vetenskapligt)
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  • 260. Alqatawna, Ja´far
    et al.
    Rissanen, Erik
    RISE., Swedish ICT, SICS.
    Sadighi, Babak
    RISE., Swedish ICT, SICS.
    Overriding of Access Control in XACML2007Ingår i: Proceedings of the Eighth IEEE International Workshop on Policies for Distributed Systems and Networks, 2007, 1, , s. 9Konferensbidrag (Refereegranskat)
    Abstract [en]

    Most access control mechanisms focus on how to define the rights of users in a precise way to prevent any violation of the access control policy of an organization. However, in many cases it is hard to predefine all access needs, or even to express them in machine readable form. One example of such a situation is an emergency case which may not be predictable and would be hard to express as a machine readable condition. Discretionary overriding of access control is one way for handling such hard to define and unanticipated situations where availability is critical. The override mechanism gives the subject of the access control policy the possibility to override a denied decision, and if the subject should confirm the override, the access will be logged for special auditing. XACML, the eXtensible Access Control Markup Language, provides a standardized access control policy language for expressing access control policies. This paper introduces a discretionary overriding mechanism in XACML. We do so by means of XACML obligations and also define a general obligation combining mechanism.

  • 261.
    Al-Ramahi, N. J.
    et al.
    Luleå University of Technology, Sweden; Middle Technical University, Iraq.
    Joffe, Roberts
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, SICOMP. Luleå University of Technology, Sweden.
    Varna, J.
    Luleå University of Technology, Sweden.
    FEM analysis of stresses in adhesive single-lap joints with non-linear materials under thermo-mechanical loading2018Ingår i: ECCM 2018 - 18th European Conference on Composite Materials, Applied Mechanics Laboratory , 2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    This study presents comprehensive numerical stress analysis in the adhesive layer of a single-lap joint subjected to various loading scenarios (mechanical and thermal loading). For this purpose numerical model (finite element method) with novel displacement coupling conditions able to correctly represent monoclinic materials (off-axis layers of composite laminates) has been developed. This model includes nonlinear material model and geometrical nonlinearity is also accounted for. The effect of thermal residual stresses (in adhesive) is analysed for various methods of manufacturing of single lap joint. The sequences of application of thermal and mechanical loads for the analysis of the thermal residual stresses in joints are proposed. It is shown that the most common approach used in many studies of linear superposition of thermal and mechanical stresses works well only for linear materials and produces wrong results if material is non-linear. The present study demonstrates suitable method to apply combined thermal and mechanical loads to get accurate stress distributions. Based on the analysis of these stress distributions the conclusions concerning the effect of the thermal residual stresses on peel and shear stress concentrations are made. The comparison between effect of thermal stresses in case of the one-step and two-step joint manufacturing techniques is made

  • 262.
    Al-Ramahi, Nawres
    et al.
    Luleå University of Technology, Sweden ; Middle Technical University, Iraq.
    Joffe, Roberts
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP AB. Luleå University of Technology, Sweden .
    Varna, Janis
    Luleå University of Technology, Sweden .
    Investigation of end and edge effects on results of numerical simulation of single lap adhesive joint with non-linear materials2018Ingår i: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 87, s. 191-204Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents systematic numerical study of stresses in the adhesive of a single-lap joint with the objective to improve understanding of the main material and geometrical parameters determining performance of adhesive joints. For this purpose a 3D model as well as 2D model, optimized with respect to the computational efficiency by use of novel displacement coupling conditions able to correctly represent monoclinic materials (off-axis layers of composite laminates), are employed. The model accounts for non-linearity of materials (adherend and adhesive) as well as geometrical non-linearity. The parameters of geometry of the joint are normalized with respect to the dimensions of adhesive (e.g. thickness) thus making analysis of results more general and applicable to wide range of different joints. Optimal geometry of the single-lap joint allowing to separate edge effect from end effects is selected based on results of the parametric analysis by using peel and shear stress distributions in the adhesive layer as a criterion. Three different types of single lap joint with similar and dissimilar (hybrid) materials are considered in this study: a) metal-metal; b) composite-composite; c) composite-metal. In case of composite laminates, four lay-ups are evaluated: uni-directional ([08]T and [908]T) and quasi-isotropic laminates ([0/45/90/-45]S and [90/45/0/-45]S). The influence of the abovementioned parameters on peel and shear stress distributions in the adhesive layer is examined carefully and mechanical parameters governing the stress concentrations in the joint have been identified, this dependence can be described by simple but accurate fitting function. The effect of the used material model (linear vs non-linear) on results is also demonstrated.

  • 263.
    Al-Ramahi, Nawres
    et al.
    Luleå University of Technology, Sweden; Middle Technical University, Iraq.
    Joffe, Roberts
    RISE - Research Institutes of Sweden, Material och produktion, SICOMP. Luleå University of Technology, Sweden.
    Varna, Janis
    Luleå University of Technology, Sweden.
    Numerical stress analysis in adhesive joints under thermo-mechanical load using model with special boundary conditions2019Ingår i: IOP Conference Series: Materials Science and Engineering, Volume 518, Mechanical and Materials Engineering: Materials Science and Engineering, Institute of Physics Publishing , 2019, nr 3Konferensbidrag (Refereegranskat)
    Abstract [en]

    A numerical study of the adhesivejoint made of similar and dissimilar adherends subjected to thermo-mechanical loading is presented. A comprehensive numerical model was used for this purpose with the novel displacement coupling conditions which are able to correctly represent monoclinic materials (off-axis layers of composite laminates). The geometrical nonlinearity as well as nonlinear material model are also taken into account. Three different types of single-lap and double-lap adhesive joints are considered in this study: a) metal-metal; b) composite-composite; c) composite-metal. In case of composite laminates, four lay-ups are evaluated: uni-directional ([08]T and [908]T) and quasi-isotropic laminates ([0/45/90/-45]S and [90/45/0/-45]S). This paper focuses on the parameters which have the majoreffect on the peel and shear stress distribution within adhesive layer at the overlap ends. The comparison of behaviour of single-and double-lap joints in relation to these parameters is made. The master curves for maximum stress (peel and shear) at the ends of the overlap with respect to the bending stiffness and axial modulus of the adherends are constructed by analysing stress distributions in the middle of the adhesive.The main conclusions of this paper are: the maximum peel stress value for SLJ is reduced with increase of the adherend bending stiffness and for DLJ,similar behaviour was observed at the end next to the inner plate corner, while, at the end next to the outer plate corner peel stress is reduced with increase of adherend axial modulus.

  • 264. Alriksson, B.
    et al.
    Rose, S. H.
    Van Zyl, W. H.
    Sjöde, A.
    Nilvebrant, N. -O
    RISE., STFI-Packforsk.
    Jönsson, L. J.
    Cellulase production from spent lignocellulose hydrolysates by recombinant aspergillus niger2009Ingår i: Applied and Environmental Microbiology, ISSN 0099-2240, E-ISSN 1098-5336, Vol. 75, nr 8, s. 2366-2374Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A recombinant Aspergillus niger strain expressing the Hypocrea jecorina endoglucanase Cel7B was grown on spent hydrolysates (stillage) from sugarcane bagasse and spruce wood. The spent hydrolysates served as excellent growth media for the Cel7B-producing strain, A. niger D15[egI], which displayed higher endoglucanase activities in the spent hydrolysates than in standard medium with a comparable monosaccharide content (e.g., 2,100 nkat/ml in spent bagasse hydrolysate compared to 480 nkat/ml in standard glucose-based medium). In addition, A. niger D15[egI] was also able to consume or convert other lignocellulose-derived compounds, such as acetic acid, furan aldehydes, and phenolic compounds, which are recognized as inhibitors of yeast during ethanolic fermentation. The results indicate that enzymes can be produced from the stillage stream as a high-value coproduct in secondgeneration bioethanol plants in a way that also facilitates recirculation of process water.

  • 265.
    Alriksson, Björn
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Cavka, Adnan
    Jönsson, Leif J.
    Improving the fermentability of enzymatic hydrolysates of lignocellulose through chemical in-situ detoxification with reducing agents2011Ingår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 102, nr 2, s. 1254-1263Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Inhibitory lignocellulose hydrolysates were treated with the reducing agents dithionite and sulfite to achieve improved fermentability. Addition of these reducing agents (in the concentration range 5.0-17.5mM) to enzymatic hydrolysates of spruce wood or sugarcane bagasse improved processes based on both SHF (simultaneous hydrolysis and fermentation) and SSF (simultaneous saccharification and fermentation). The approach was exemplified in ethanolic fermentations with Saccharomyces cerevisiae and by using hydrolysates with sugar concentrations >100g/L (for SHF) and with 10% dry-matter content (for SSF). In the SHF experiments, treatments with dithionite raised the ethanol productivities of the spruce hydrolysate from 0.2 to 2.5g×L -1×h -1 and of the bagasse hydrolysate from 0.9 to 3.9g×L -1×h -1, values even higher than those of fermentations with reference sugar solutions without inhibitors. Benefits of the approach include that the addition of the reducing agent can be made in-situ directly in the fermentation vessel, that the treatment can be performed at a temperature and pH suitable for fermentation, and that the treatment results in dramatically improved fermentability without degradation of fermentable sugars. The many benefits and the simplicity of the approach offer a new way to achieve more efficient manufacture of fermentation products from lignocellulose hydrolysates. © 2010 Elsevier Ltd.

  • 266.
    Alriksson, Björn
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Eskilsson, Martin
    Holmen, Sweden.
    Johansson, Emma
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Lapidot, Shaul
    Melodea, Israel.
    Norström, Markus
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Schultz-Eklund, Ola
    Holmen, Sweden .
    Shkedi, Yoram
    Melodea, Israel.
    Svedberg, Anna
    MoRe Research, Sweden.
    Svensson, Stefan
    MoRe Research, Sweden.
    Swerin, Agne
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Europe’s first pilot facility for cellulose nanocrystals (CNC)2016Ingår i: Annual Surface and Materials Chemistry Symposium and Materials for tomorrow (ASMCS 2016), 2016Konferensbidrag (Refereegranskat)
  • 267.
    Alriksson, Björn
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Hörnberg, Andreas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Fish feed from wood2014Ingår i: Cellulose Chemistry and Technology, ISSN 0576-9787, Vol. 48, nr 9-10, s. 843-848Artikel i tidskrift (Refereegranskat)
  • 268.
    Alriksson, Björn
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Hörnberg, Andreas
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Gudnason, Asgeir Eirikur
    Saebyli Ehf, Iceland.
    Knobloch, Stephen
    Matis, Iceland.
    Arnason, Jon
    Matis, Iceland.
    Johannsson, Ragnar
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Fish feed from wood2014Ingår i: Cellulose Chemistry and Technology, ISSN 0576-9787, Vol. 48, s. 843-848Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Increased demand of fish in combination with overexploitation of the fish stocks of the oceans has led to an increased production of fish through aquaculture. Today, fishmeal is the main protein source in fish feed for most aquaculture species. However, fishmeal is soon expected to fall short of demand as its production is associated with environmental problems. This shortage must therefore be met by sustainable alternative protein sources. Protein-rich microorganisms (i.e. Single cell protein) is an interesting option as a fishmeal substitute in fish feed which, in addition, can be produced as an important co-product in wood-based biorefineries. In the current study, four different microorganisms were cultivated on five different residual streams from Swedish wood-based biorefineries. Screening experiments were carried out in shake flasks, optimization experiments in benchtop bioreactors, and scale-up experiments were performed in a 50-litre pilot bioreactor. In addition, a demo-scale experiment was carried out in the Swedish Biorefinery Demo Plant. Microbial biomass from the scale-up experiments was collected and used for production of different fish feed formulations which, in turn, were used in feeding trials of the freshwater fish Tilapia. Fishes fed with feed, in which part of the fishmeal had been substituted with Single cell protein, showed similar or better growth than fishes fed with a fishmeal-based control feed.

  • 269.
    Alsbjer, Markus
    et al.
    SP - Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Lindahl, Markus
    SP - Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Axell, Monica
    SP - Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    The potential for increased primary energy efficiensy and reduces CO2 emissions by DHC2011Rapport (Refereegranskat)
  • 270. Alshawi, Hiyan
    et al.
    Brown, Carl
    RISE - Research Institutes of Sweden, ICT, SICS.
    Carter, David
    Gambäck, Björn
    RISE., Swedish ICT, SICS.
    Pulman, Steve
    Rayner, Manny
    RISE - Research Institutes of Sweden, ICT, SICS.
    Bilingual conversation interpreter : a prototype interactive message translator. Final report1991Rapport (Övrigt vetenskapligt)
    Abstract [en]

    This document is the final report for a research project aimed at producing a prototype system for on-line translation of typed dialogues between speakers of different natural languages. The work was carried out jointly by SICS and SRI Cambridge. The resulting prototype system (called Billingual Conversation Interpreter, or BCI) translates between english and Swedish in both directions.The Major components of the BCI are two copies of the SRI Core Language Engine, equipped with English and Swedish grammars respectively. These are linked by the transfer and disambiguation components. Translation takes place by analyzing the source-language sentence into Quasi Logical Form ( QLF), a linguistically motivated logical representation, transferring this into a target-language QLF, and generating a target-language sentence. When ambiguities occur that cannot be resolved automatically, they are clarified by Querying the appropriate user. The clarification dialogue presupposes no knowledge of either linguistics or the other language. The prototype system has a broad grammatical coverage, a initial vocabulary of about 1000 words together with vocabulary expansion tools, and a set of English-Swedish transfer rules. The formalism developed for coding this linguistic information make it relatively easy to extend the system. We believe that the project was successful in demonstrating the feasibility of using these techniques for interactive translation applications, and provides a sound basis for development of a large scale message translator system with potential for commercial exploitation.The main sections of this report are the following: * A non-technical introduction, summarizing the BCI's design , and containing a sample session. * An overview of the Swedish version of the CLE. * A detailed discussion of the theory and practice of QLF transfer. * A description of the interactive disambiguation method. * Suggestions for possible follow-on projects aimed in the direction of practically usable commercial systems.

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  • 271. Alshawi, Hiyan
    et al.
    Carter, David
    Gambäck, Björn
    RISE., Swedish ICT, SICS.
    Pulman, Steve
    Rayner, Manny
    RISE - Research Institutes of Sweden, ICT, SICS.
    Transfer through quasi logical form - A new approach to machine translation1991Rapport (Övrigt vetenskapligt)
    Abstract [en]

    This Document is an introduction to a research project aimed at producing a prototype system for on-line translation of typed dialogues between speakers of different natural languages. The work was carried out jointly by SICS and SRI Cambridge. The resulting prototype system (called Billingual Conversation Interpreter, or BCI) translates between English and Swedish in both Directions. The major components of the BCI are two copies of the SRI Core Language Engine, equipped with English and Swedish grammars respectively. These are linked by the transfer and disambiguation components. Translation takes place by analyzing the source-language sentence into Quasi Logical Form (QLF), a linguistically motivated logical representation, transferring this onto a target-language QLF, and generating a target-language sentence. We believe that the project was successful in demonstrating the feasibility of using these techniques for interactive translation applications, and provides a sound basis for development of a large scale message translator system. The final section of the paper points to several possible follow-on projects aimed in the direction of practically usable commercial systems.

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  • 272.
    Al-Shishtawy, Ahmad
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Self-management for large-scale distributed systems2012Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Autonomic computing aims at making computing systems self-managing by using autonomic managers in order to reduce obstacles caused by management complexity. This thesis presents results of research on self-management for large-scale distributed systems. This research was motivated by the increasing complexity of computing systems and their management. In the first part, we present our platform, called Niche, for programming self-managing component-based distributed applications. In our work on Niche, we have faced and addressed the following four challenges in achieving self-management in a dynamic environment characterized by volatile resources and high churn: resource discovery, robust and efficient sensing and actuation, management bottleneck, and scale. We present results of our research on addressing the above challenges. Niche implements the autonomic computing architecture, proposed by IBM, in a fully decentralized way. Niche supports a network-transparent view of the system architecture simplifying the design of distributed self-management. Niche provides a concise and expressive API for self-management. The implementation of the platform relies on the scalability and robustness of structured overlay networks. We proceed by presenting a methodology for designing the management part of a distributed self-managing application. We define design steps that include partitioning of management functions and orchestration of multiple autonomic managers. In the second part, we discuss robustness of management and data consistency, which are necessary in a distributed system. Dealing with the effect of churn on management increases the complexity of the management logic and thus makes its development time consuming and error prone. We propose the abstraction of Robust Management Elements, which are able to heal themselves under continuous churn. Our approach is based on replicating a management element using finite state machine replication with a reconfigurable replica set. Our algorithm automates the reconfiguration (migration) of the replica set in order to tolerate continuous churn. For data consistency, we propose a majority-based distributed key-value store supporting multiple consistency levels that is based on a peer-to-peer network. The store enables the tradeoff between high availability and data consistency. Using majority allows avoiding potential drawbacks of a master-based consistency control, namely, a single-point of failure and a potential performance bottleneck. In the third part, we investigate self-management for Cloud-based storage systems with the focus on elasticity control using elements of control theory and machine learning. We have conducted research on a number of different designs of an elasticity controller, including a State-Space feedback controller and a controller that combines feedback and feedforward control. We describe our experience in designing an elasticity controller for a Cloud-based key-value store using state-space model that enables to trade-off performance for cost. We describe the steps in designing an elasticity controller. We continue by presenting the design and evaluation of ElastMan, an elasticity controller for Cloud-based elastic key-value stores that combines feedforward and feedback control.

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  • 273.
    Al-Shishtawy, Ahmad
    et al.
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Asif Fayyaz, Muhammad
    Popov, Konstantin
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Vlassov, Vladimir
    Achieving Robust Self-Management for Large-Scale Distributed Applications2010Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Autonomic managers are the main architectural building blocks for constructing self-management capabilities of computing systems and applications. One of the major challenges in developing self-managing applications is robustness of management elements which form autonomic managers. We believe that transparent handling of the effects of resource churn (joins/leaves/failures) on management should be an essential feature of a platform for self-managing large-scale dynamic distributed applications, because it facilitates the development of robust autonomic managers and hence improves robustness of self-managing applications. This feature can be achieved by providing a robust management element abstraction that hides churn from the programmer. In this paper, we present a generic approach to achieve robust services that is based on finite state machine replication with dynamic reconfiguration of replica sets. We contribute a decentralized algorithm that maintains the set of nodes hosting service replicas in the presence of churn. We use this approach to implement robust management elements as robust services that can operate despite of churn. Our proposed decentralized algorithm uses peer-to-peer replica placement schemes to automate replicated state machine migration in order to tolerate churn. Our algorithm exploits lookup and failure detection facilities of a structured overlay network for managing the set of active replicas. Using the proposed approach, we can achieve a long running and highly available service, without human intervention, in the presence of resource churn. In order to validate and evaluate our approach, we have implemented a prototype that includes the proposed algorithm.

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  • 274.
    Alt Murphy, Margit
    et al.
    University of Gothenburg, Sweden; Sahlgrenska University Hospital, Sweden.
    Andersson, Sofi
    University of Gothenburg, Sweden; Sahlgrenska University Hospital, Sweden.
    Danielsson, Anna
    University of Gothenburg, Sweden.
    Wipenmyr, Jan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ohlsson, Fredrik
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Comparison of accelerometer-based arm, leg and trunk activity at weekdays and weekends during subacute inpatient rehabilitation after stroke2019Ingår i: Journal of Rehabilitation Medicine, ISSN 1650-1977, E-ISSN 1651-2081, Vol. 51, nr 6, s. 426-433Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Objective: To determine whether there are differences in arm, leg and trunk activity measured by acceleration between weekdays and weekends in people undergoing rehabilitation in the subacute stage after stroke. Design: Cross-sectional study. Patients: Twenty-eight individuals with stroke (mean age 55.4 years; severe to mild impairment) and 10 healthy controls. Methods: A set of 5 3-axial accelerometers were used on the trunk, wrists and ankles during 2 48-h sessions at weekdays and over a weekend. Day-time acceleration raw data were expressed as the signal magnitude area. Asymmetry between the affected and less-affected limb was calculated as a ratio. Results: Participants with stroke used their both arms and legs less at weekends than on weekdays (p<0.05, effect size 0.32–0.57). Asymmetry between the affected and less-affected arm was greater at weekends (p < 0.05, effect size 0.32). All activity measures, apart from the less-affected arm on weekdays, were lower in stroke compared with controls (p<0.05, effect size 0.4–0.8). No statistically significant differences were detected between weekday and weekend activity for the control group. One-third of participants perceived the trunk sensor as inconvenient to wear. Conclusion: Increased focus needs to be applied on activities carried out during weekends at rehabilitation wards.

  • 275.
    Alt Murphy, Margit
    et al.
    University of Gothenburg, Sweden.
    Bergquist, Filip
    University of Gothenburg, Sweden.
    Hagström, Bengt
    RISE - Research Institutes of Sweden, Material och produktion, IVF. Chalmers University of Technology, Sweden.
    Hernández, Niina
    University of Borås, Sweden.
    Johansson, Dongni
    University of Gothenburg, Sweden.
    Ohlsson, Fredrik
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Sandsjö, Leif
    University of Borås, Sweden; Chalmers University of Technology, Sweden.
    Wipenmyr, Jan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Malmgren, Kristina
    University of Gothenburg, Sweden; Sahlgrenska University Hospital, Sweden.
    An upper body garment with integrated sensors for people with neurological disorders – early development and evaluation2019Ingår i: BMC Biomedical Engineering, Vol. 1, artikel-id 3Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background

    In neurology and rehabilitation the primary interest for using wearables is to supplement traditional patient assessment and monitoring in hospital settings with continuous data collection at home and in community settings. The aim of this project was to develop a novel wearable garment with integrated sensors designed for continuous monitoring of physiological and movement related variables to evaluate progression, tailor treatments and improve diagnosis in epilepsy, Parkinson’s disease and stroke.

    Methods

    In this paper the early development and evaluation of a prototype designed to monitor movements and heart rate is described. An iterative development process and evaluation of an upper body garment with integrated sensors included: identification of user needs, specification of technical and garment requirements, garment development and production as well as evaluation of garment design, functionality and usability. The project is a multidisciplinary collaboration with experts from medical, engineering, textile, and material science within the wearITmed consortium. The work was organized in regular meetings, task groups and hands-on workshops. User needs were identified using results from a mixed-methods systematic review, a focus group study and expert groups. Usability was evaluated in 19 individuals (13 controls, 6 patients with Parkinson’s disease) using semi-structured interviews and qualitative content analysis.

    Results

    The garment was well accepted by the users regarding design and comfort, although the users were cautious about the technology and suggested improvements. All electronic components passed a washability test. The most robust data was obtained from accelerometer and gyroscope sensors while the electrodes for heart rate registration were sensitive to motion artefacts. The algorithm development within the wearITmed consortium has shown promising results.

    Conclusions

    The prototype was accepted by the users. Technical improvements are needed, but preliminary data indicate that the garment has potential to be used as a tool for diagnosis and treatment selection and could provide added value for monitoring seizures in epilepsy, fluctuations in PD and activity levels in stroke. Future work aims to improve the prototype further, develop algorithms, and evaluate the functionality and usability in targeted patient groups. The potential of incorporating blood pressure and heart-rate variability monitoring will also be explored.

  • 276. Altaf, F.
    et al.
    Johannesson, Lars
    RISE., Swedish ICT, Viktoria.
    Egardt, B.
    On thermal and state-of-charge balancing using cascaded multi-level converters2013Ingår i: Journal of Power Electronics (JPE), ISSN 1598-2092, E-ISSN 2093-4718, Vol. 13, nr 4, s. 569-583Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, the simultaneous use of a multi-level converter (MLC) as a DC-motor drive and as an active battery cell balancer is investigated. MLCs allow each battery cell in a battery pack to be independently switched on and off, thereby enabling the potential non-uniform use of battery cells. By exploiting this property and the brake regeneration phases in the drive cycle, MLCs can balance both the state of charge (SoC) and temperature differences between cells, which are two known causes of battery wear, even without reciprocating the coolant flow inside the pack. The optimal control policy (OP) that considers both battery pack temperature and SoC dynamics is studied in detail based on the assumption that information on the state of each cell, the schedule of reciprocating air flow and the future driving profile are perfectly known. Results show that OP provides significant reductions in temperature and in SoC deviations compared with the uniform use of all cells even with uni-directional coolant flow. Thus, reciprocating coolant flow is a redundant function for a MLC-based cell balancer. A specific contribution of this paper is the derivation of a state-space electro-thermal model of a battery submodule for both uni-directional and reciprocating coolant flows under the switching action of MLC, resulting in OP being derived by the solution of a convex optimization problem.

  • 277. Altaf, F
    et al.
    Johannesson Mårdh, L
    RISE., Swedish ICT, Viktoria.
    Egardt, B
    Feasibility Issues of Using Three-Phase Multilevel Inverter based Cell Balancer in Battery Management System for xEVs2013Ingår i: IFAC Proceedings Volumes, Vol. 46, s. 360-, artikel-id 21Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The use of a three-phase multilevel converter (MLC) as an integrated cell balancer and motor driver is investigated for three-phase AC applications in EVs/HEVs/PHEVs. The paper analyzed an issue of additional battery losses caused by the flow of reactive and/or harmonic power from each power cell of the three-phase MLC battery system. The paper also investigates the size of shunt capacitor required for compensation of the losses to acceptable level. This study concludes that the size of the required capacitor is too big for the vehicle application unless some other active compensation is used as well. Another practical way to employ the MLC as a cell balancer is to use it in a cascaded connection with the conventional three-phase two-level voltage source inverter however it may not be a cost-effective solution either due to high component count.

  • 278. Altaf, F
    et al.
    Johannesson Mårdh, L
    RISE., Swedish ICT, Viktoria.
    Egardt, B
    On Thermal State-of-Charge Balancing using Cascaded Multilevel Converter2013Ingår i: Journal of Power Electronics (JPE), ISSN 1598-2092, E-ISSN 2093-4718, Vol. 13, nr 4, s. 569-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Multilevel Converters are studied for simultaneous_x000D_ use as a DC-motor drive active battery cell balancer._x000D_ The Multilevel Converter (MLC) allows to independently switch_x000D_ ON/OFF each battery cell in a battery pack giving the possibility_x000D_ of non-uniform use of the battery cells. By exploiting this_x000D_ property brake regeneration phases in the drive cycle, the_x000D_ MLC has the possibility to balance both State-of-Charge (SoC)_x000D_ temperature differences between the cells, which are two_x000D_ known causes of battery wear, without even reciprocating the_x000D_ coolant flow inside the pack. The optimal control policy (OP )_x000D_ that takes into consideration both the battery pack temperature_x000D_ SoC dynamics is studied in detail based on the assumption_x000D_ of perfect information of the state the future driving. The_x000D_ results show that OP gives significant reduction in temperature_x000D_ SoC deviations compared to uniform use of all the cells even_x000D_ under unidirectional coolant flow. Thus reciprocating coolant flow_x000D_ is a redundant function for MLC based cell balancer. A specific_x000D_ contribution of the paper is the derivation of a state-space electrothermal_x000D_ model of a battery submodule €”for both unidirectional_x000D_ as well as reciprocating coolant flow€” under the switching action_x000D_ of an MLC, formulated in such a way that the OP is given by_x000D_ the solution of a convex optimization problem._x000D_

  • 279. Althammer, Egbert
    et al.
    Schoitsch, Erwin
    Eriksson, Henrik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Pålitliga system.
    Vinter, Jonny
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Pålitliga system.
    The DECOS Concept of Generic Safety Cases - a Step Towards Modular Certification Support2009Ingår i: 35th Euromicro Conference on Software Engineering and Advanced applications SEAA. Patras, Greece. 2009-08-27--29, 2009Konferensbidrag (Refereegranskat)
  • 280. Althammer, Egbert
    et al.
    Schoitsch, Erwin
    Eriksson, Henrik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Pålitliga system.
    Vinter, Jonny
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Pålitliga system.
    Pataticza, Andras
    Csertan, Gy-rgy
    An Open System for Dependable System Validation and Verification Support - The DECOS Generic Test Bench2007Konferensbidrag (Refereegranskat)
  • 281. Althammer, Egbert
    et al.
    Schoitsch, Erwin
    Sonneck, Gerald
    Eriksson, Henrik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Pålitliga system.
    Vinter, Jonny
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Pålitliga system.
    Modular Certification Support - the DECOS Concept of Generic Safety Cases2008Konferensbidrag (Övrigt vetenskapligt)
  • 282.
    Altmann, Peter
    et al.
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Linder, Marcus
    RISE - Research Institutes of Sweden, ICT, Viktoria.
    Managing Emerging (Mis)Alignments in Data-Driven Servitization2019Ingår i: Research technology management, ISSN 0895-6308, E-ISSN 1930-0166, Vol. 62, nr 4, s. 37-45Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Overview: Manufacturers moving to service-based business models are generally advised to provide total-care solutions to their customers in order to boost profits and strengthen customer relationships. To reduce the risks associated with such services, service providers often rely on remote monitoring technologies to access data on their products’ health and usage. Our study reveals a tension between the technical development of complex products capable of remote monitoring and the business logic required to commercialize this potential. Specifically, we show that the collaborative value co-creation context within which these products are typically developed requires managers to seek alignment in technical specifications and value co-creation logics simultaneously. However, technical alignment is contingent on factors that can lead to business logic misalignments. 

  • 283.
    Alvarez-Asencio, Ruben
    et al.
    KTH Royal Institute of Technology, Sweden.
    Sababi, Majid
    KTH Royal Institute of Technology, Sweden.
    Pan, Jinshan
    KTH Royal Institute of Technology, Sweden.
    Ejnermark, Sebastian
    Uddeholms AB, Sweden.
    Ekman, Lars
    Uddeholms AB, Sweden.
    Rutland, Mark W.
    RISE., SP – Sveriges Tekniska Forskningsinstitut. KTH Royal Institute of Technology, Sweden.
    Role of microstructure on corrosion initiation of an experimental tool alloy: A Quantitative Nanomechanical Property Mapping study2015Ingår i: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 89, s. 236-241Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The adhesion properties of a FeCrVN experimental tool alloy immersed in pure water and sodium chloride solution have been studied by Quantitative Nanomechanical Property Mapping to understand the influence of microstructure on corrosion initiation of this alloy. The approach used here allows early observation and identification of pre-pitting events that may lead to passivity breakdown of the alloy. Adhesion provides a good distinction between the different regions and we ascribe this to their vanadium and nitrogen contents. Finally, the prepitting is characterized by generation of small particles in specific regions of the surface with low chromium content.

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  • 284. Alégroth, Emil
    et al.
    Burden, Håkan
    Ericsson, Morgan
    Hammouda, Imed
    Knauss, Eric
    Steghöfer, Jan-Philipp
    Teaching Scrum - What We Did, What We Will Do and What Impedes Us2015Konferensbidrag (Övrigt vetenskapligt)
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  • 285. Amadio, Roberto
    et al.
    Dam, Mads
    RISE - Research Institutes of Sweden, ICT, SICS.
    A Proof System for the pi-calculus1996Rapport (Övrigt vetenskapligt)
    Abstract [en]

    We study the problem of specifying and verifying properties of pi-calculus processes while relying on a bisimulation semantics. As our property specification language we use a version of the modal mu-calculus adapted to the pi-calculus. We show that the logical language is sufficiently expressive to characterize by means of a finite formula a process up to any approximation of the bisimulation relation. We consider the problem of checking that a process of the pi-calculus satisfies a specification expressed in this modal mu-calculus. We develop an algorithm which is sound in general, and complete for processes having a finite reachability property. Finally, we present a proof system which can be applied to prove non-recursive properties of arbitrary processes. We show that the system is complete on the non-recursive fragment of the logical language.

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  • 286. Amadio, Roberto
    et al.
    Dam, Mads
    RISE - Research Institutes of Sweden, ICT, SICS.
    Reasoning about Higher-Order Processes1994Rapport (Övrigt vetenskapligt)
    Abstract [en]

    We address the specification and verification problem for process calculi such as Chocs, CML and Facile where processes or functions are transmissible values. Our work takes place in the context of a static treatment of restriction and of a bisimulation-based semantics. As a paradigmatic and simple case we concentrate on (Plain) Chocs. We show that Chocs bisimulation can be characterized by an extension of Hennessy-Milner logic including a constructive implication, or function space constructor. This result is a non-trivial extension of the classical characterization result for labelled transition systems. In the second part of the paper we address the problem of developing a proof system for the verification of process specifications. Building on previous work for CCS we present an infinitary sound and complete proof system for the fragment of the calculus not handling restriction.

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  • 287.
    Amaral, Andreia
    et al.
    Ghent University, Belgium; Universidade de Lisboa, Portugal.
    Gillot, Sylvie
    Irstea, France.
    Garrido-Baserba, Manel
    University of California, USA.
    Filali, Ahlem
    Irstea, France.
    Karpinska, Anna
    Southern Water, UK.
    Plósz, Benedek
    University of Bath, UK.
    De Groot, Christopher
    Western University, Canada.
    Bellandi, Giacomo
    Ghent University, Belgium.
    Nopens, Ingmar
    Ghent University, Belgium.
    Takács, Imre
    Dynamita, France.
    Lizarralde, Izaro
    Universidad de Navarra, Spain; Ceit, Spain.
    Jimenez, Jose
    Brown and Caldwell, USA.
    Fiat, Justine
    Irstea, France.
    Rieger, Leiv
    CTRL Solutions Inc, Canada.
    Arnell, Magnus
    RISE - Research Institutes of Sweden, Samhällsbyggnad, Energi och cirkulär ekonomi. Lund University, Sweden.
    Andersen, Mikkel
    DHI, Denmark.
    Jeppsson, Ulf
    Lund University, Sweden.
    Rehman, Usman
    Ghent University, Belgium.
    Fayolle, Yannick
    Irstea, France.
    Amerlinck, Youri
    Ghent University, Belgium.
    Rosso, Diego
    University of California, USA.
    Modelling gas-liquid mass transfer in wastewater treatment: when current knowledge needs to encounter engineering practice and vice versa2019Ingår i: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 80, nr 4, s. 607-619Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Gas-liquid mass transfer in wastewater treatment processes has received considerable attention over the last decades from both academia and industry. Indeed, improvements in modelling gas-liquid mass transfer can bring huge benefits in terms of reaction rates, plant energy expenditure, acid-base equilibria and greenhouse gas emissions. Despite these efforts, there is still no universally valid correlation between the design and operating parameters of a wastewater treatment plant and the gas-liquid mass transfer coefficients. That is why the current practice for oxygen mass transfer modelling is to apply overly simplified models, which come with multiple assumptions that are not valid for most applications. To deal with these complexities, correction factors were introduced over time. The most uncertain of them is the α-factor. To build fundamental gas-liquid mass transfer knowledge more advanced modelling paradigms have been applied more recently. Yet these come with a high level of complexity making them impractical for rapid process design and optimisation in an industrial setting. However, the knowledge gained from these more advanced models can help in improving the way the α-factor and thus gas-liquid mass transfer coefficient should be applied. That is why the presented work aims at clarifying the current state-of-the-art in gas-liquid mass transfer modelling of oxygen and other gases, but also to direct academic research efforts towards the needs of the industrial practitioners.

  • 288. Ameur, Adam
    et al.
    Aurell, Erik
    Carlsson, Mats
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Westholm, Jakub Orzechowski
    Global gene expression analysis by combinatorial optimization2004Ingår i: In Silico Biology, ISSN 1434-3207, Vol. 4Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Generally, there is a trade-off between methods of gene expression analysis that are precise but labor-intensive, e.g. RT-PCR, and methods that scale up to global coverage but are not quite as quantitative, e.g. microarrays. In the present paper, we show how how a known method of gene expression profiling (K. Kato, Nucleic Acids Research 23, 3685-3690 (1995)), which relies on a fairly small number of steps, can be turned into a global gene expression measurement by advanced data post-processing, with potentially little loss of accuracy. Post-processing here entails solving an ancillary combinatorial optimization problem. Validation is performed on in silico experiments generated from the FANTOM data base of full-length mouse cDNA. We present two variants of the method. One uses state-of-the-art commercial software for solving problems of this kind, the other a code developed by us specifically for this purpose, released in the public domain under GPL license.

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  • 289. Amin, G
    et al.
    Sandberg, M O
    RISE., Swedish ICT, Acreo.
     Zainelabdin, A
     Zaman, S
     Nur, O
    Willander, M
    Scale-up synthesis of ZnO nanorods for printing inexpensive ZnO/polymer white light-emitting diode2012Ingår i: Journal of Materials Science_x000D_, Vol. 47, s. 4726-31Artikel i tidskrift (Refereegranskat)
  • 290.
    Amin, Sidra
    et al.
    Luleå University of Technology, Sweden; University of Sindh, Pakistan´; Shaheed Benazir Bhutto University, Pakistan .
    Tahira, Aneela
    Luleå University of Technology, Sweden .
    Solangi, Amber
    University of Sindh, Pakistan.
    Beni, Valerio
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Morante, JR
    Catalonia Institute for Energy Research, Spain.
    Liu, Xianjie
    Linköping University, Sweden.
    Falhman, Mats
    Linköping University, Sweden.
    Mazzaro, Raffaello
    Luleå University of Technology, Sweden .
    Ibupoto, Zafar
    Luleå University of Technology, Sweden .
    Vomiero, Alberto
    Luleå University of Technology, Sweden .
    A practical non-enzymatic urea sensor based on NiCo 2 O 4 nanoneedles2019Ingår i: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, nr 25, s. 14443-14451Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We propose a new facile electrochemical sensing platform for determination of urea, based on a glassy carbon electrode (GCE) modified with nickel cobalt oxide (NiCo 2 O 4 ) nanoneedles. These nanoneedles are used for the first time for highly sensitive determination of urea with the lowest detection limit (1 μM) ever reported for the non-enzymatic approach. The nanoneedles were grown through a simple and low-temperature aqueous chemical method. We characterized the structural and morphological properties of the NiCo 2 O 4 nanoneedles by TEM, SEM, XPS and XRD. The bimetallic nickel cobalt oxide exhibits nanoneedle morphology, which results from the self-assembly of nanoparticles. The NiCo 2 O 4 nanoneedles are exclusively composed of Ni, Co, and O and exhibit a cubic crystalline phase. Cyclic voltammetry was used to study the enhanced electrochemical properties of a NiCo 2 O 4 nanoneedle-modified GCE by overcoming the typical poor conductivity of bare NiO and Co 3 O 4 . The GCE-modified electrode is highly sensitive towards urea, with a linear response (R 2 = 0.99) over the concentration range 0.01-5 mM and with a detection limit of 1.0 μM. The proposed non-enzymatic urea sensor is highly selective even in the presence of common interferents such as glucose, uric acid, and ascorbic acid. This new urea sensor has good viability for urea analysis in urine samples and can represent a significant advancement in the field, owing to the simple and cost-effective fabrication of electrodes, which can be used as a promising analytical tool for urea estimation.

  • 291.
    Amiryarahmadi, Nata
    Chalmers University of Technology, Sweden.
    A Virtual Design Studio for Low-Frequency Sound from Walking in Lightweight Buildings2019Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    In recent years there has been a growing interest for building lightweight multistorey woodenresidential buildings in countries like Sweden with large and renewable forests. While positive aspectsof these buildings, such as sustainability, ease of construction and lightness, motivate building more inwood, poor acoustic performance is a risk which concerns the wooden-building industry.Low-frequency impact sound from walking of the neighbors upstairs is the main source of complaintsabout the acoustic performance of these buildings. The disturbance caused by walking sounds,transmitted through lightweight wooden floors, results in acoustic discomfort and impairs theperceived quality of the building; sometimes even when the building has fulfilled an acoustic classhigher than minimum requirement, according to the national standard on sound classification and itssingle number ratings. The standard methods for objective evaluation of impact sound insulation offloors cannot predict, at a satisfactory level, the walking sound annoyance that the inhabitants ofwooden buildings experience. This causes an uncertainty about the resulting perceived quality of thesebuildings, which greatly concerns the building manufacturers and demotivates them from choosinglightweight wooden elements over heavyweight building materials such as concrete. This uncertaintycan be overcome by evaluating the perceived acoustic quality of the building prior to its construction.

    One solution is to build test houses where the subjective acoustic performance of floor samples can beevaluated in advance to the building construction. However, building a test house is expensive;besides, for evaluating the effect of every design modification on the experienced acoustic comfort ofthe building, a real floor sample has to be built and installed in the house, which would be timeconsumingand costly. An alternative solution is to use virtual acoustic test facilities.In this thesis a virtual design studio for impact sound is developed. It is a tool that facilitates creatingand listening to the acoustic field generated by impact forces such as footsteps on lightweight floors. Italso provides the possibility to evaluate the acoustic performance of floor elements in an early designphase, and to investigate the correlation between design parameters and the perceived impact soundinsulation of the floor. The tool is demonstrated and a very first listening test shows that one can obtainresults which are in good agreement with the results in literature. Loudness, reverberation andthumping are shown to influence the annoyance. It is also shown that there is a difference in judgementof walking sounds by persons who have experience with lightweight floors at home and by those whodo not have that experience.

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  • 292.
    Amiryarahmadi, Nata
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut. Chalmers University of Technology, Sweden.
    Kropp, Wolfgang
    Chalmers University of Technology, Sweden.
    Larsson, Krister
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Application of LMS algorithm to measure low-frequency transient forces from human walking2016Ingår i: Acta Acoustica united with Acustica, ISSN 1610-1928, E-ISSN 1861-9959, Vol. 102, nr 1, s. 23-34Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Measurement and modeling of low frequency ground reaction forces (GRFs) from human walking have been the subjects of research in different fields from biomechanics to civil engineering and structural dynamics. Many of the existing models are developed based on experiments which alter natural walking by for example presence of force transducers, limitations in the speed and path of walking and replacing the real floor with a transducerfacilitated measurement rig. These alterations result in contact forces which do not represent real GRFs. In this study, a time-domain inverse measurement method based on LMS algorithm is used to measure low-frequency (<100 Hz) forces induced by human footsteps. The LMS-based force identification method is first validated for low-frequency excitations with less complexity in number of excitation positions and frequency content compared with the footsteps. The method is then applied to measure ground reaction forces created by human walking.

  • 293.
    Amiryarahmadi, Nata
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut. Chalmers University of Technology, Sweden.
    Kropp, Wolfgang
    Chalmers University of Technology, Sweden.
    Larsson, Krister
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Identification of low-frequency forces induced by footsteps on lightweight floors2016Ingår i: Acta Acoustica united with Acustica, ISSN 1610-1928, E-ISSN 1861-9959, Vol. 102, nr 1, s. 45-57Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Despite many advantages of wooden buildings, low-frequency noise disturbance, mainly from human footsteps on timber floors, is a major hindrance for widespread application of wood in multi-storey buildings. In many cases the impact noise evaluations of the wooden floors according to ISO 140-7 and ISO 717-2 standards do not correspond to subjective experiences. This study aims to investigate the characteristics of footstep forces to support further studies related to discrepancies between standard evaluations and low-frequency noise disturbances in lightweight buildings. Transient footstep forces in vertical direction made by different walkers and different footwear on two floor structures were measured and compared. The vertical footstep forces were then compared with the impact forces made by a standard tapping machine. Analysis revealed that footstep forces contain large amplitudes at low frequencies (20 < f < 50) which are not included in the standard evaluation procedure. Therefore, by extending the frequency range of the standard measurements down to 20 Hz and designing an accurate adaptation term for evaluations, a better correlation between standard impact noise evaluations and acoustic performance of the lightweight buildings might be achieved.

  • 294.
    Amiryarahmadi, Nata
    et al.
    Akustik (Eta).
    Wendin, Karin
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Mat- och måltidsvanor samt önskningar kring detta2014Rapport (Refereegranskat)
    Abstract [sv]

    Enkätundersökning bland äldre

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 295.
    Amon, Francine
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    Objective evaluation of imager performance2011Ingår i: Proceedings of the International Conference on Sensing Technology, 2011, , s. 47-52Konferensbidrag (Refereegranskat)
  • 296.
    Amon, Francine
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    Thermal Imagers, a powerful Tool for the fire Service2011Ingår i: Brandposten, nr 44, s. 30-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 297.
    Amon, Francine
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, skydd (BRs ).
    Andersson, Petra
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    Karlson, Ingvar
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Produktsäkerhet.
    Sahlin, Eskil
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Fire risks associated with batteries2012Rapport (Refereegranskat)
    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 298.
    Amon, Francine
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    Appel, Glenn
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Sjöström, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Impact of climate change on forest fire risk in Sweden2014Ingår i: Brandposten, nr 49, s. 41-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 299.
    Amon, Francine
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Brandteknik, forskning (BRf ).
    Brandt, Jonas
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Effectiveness of Bus Engine Compartment Fire Suppression Systems2013Ingår i: Proceedings from Interflam 2013, 13th International Conference and Exhibition on Fire Safety,, 2013, , s. 289-294Konferensbidrag (Refereegranskat)
  • 300.
    Amon, Francine
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Gehandler, Jonatan
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Stahl, Selim
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Development of an Environmental and Economic Assessment Tool (Enveco Tool) for Fire Events2016Ingår i: Brandposten, nr 54, s. 32-32Artikel i tidskrift (Övrigt vetenskapligt)
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