| 1. |
- Alzghoul, Ahmad, et al.
(författare)
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Comparing a knowledge-based and a data-driven method in querying data streams for system fault detection : A hydraulic drive system application
- 2014
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Ingår i: Computers in industry (Print). - : Elsevier. - 0166-3615 .- 1872-6194. ; 65:8, s. 1126-1135
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Tidskriftsartikel (refereegranskat)abstract
- The field of fault detection and diagnosis has been the subject of considerable interest in industry. Fault detection may increase the availability of products, thereby improving their quality. Fault detection and diagnosis methods can be classified in three categories: data-driven, analytically based, and knowledge-based methods.In this work, we investigated the ability and the performance of applying two fault detection methods to query data streams produced from hydraulic drive systems. A knowledge-based method was compared to a data-driven method. A fault detection system based on a data stream management system (DSMS) was developed in order to test and compare the two methods using data from real hydraulic drive systems.The knowledge-based method was based on causal models (fault trees), and principal component analysis (PCA) was used to build the data-driven model. The performance of the methods in terms of accuracy and speed, was examined using normal and physically simulated fault data. The results show that both methods generate queries fast enough to query the data streams online, with a similar level of fault detection accuracy. The industrial applications of both methods include monitoring of individual industrial mechanical systems as well as fleets of such systems. One can conclude that both methods may be used to increase industrial system availability.
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| 2. |
- Alzghoul, Ahmad, et al.
(författare)
-
Comparing a knowledge-based and a data-driven method in querying data streams for system fault detection: A hydraulic drive system application
- 2014
-
Ingår i: Computers in industry (Print). - : Elsevier BV. - 0166-3615 .- 1872-6194. ; 65:8, s. 1126-1135
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Tidskriftsartikel (refereegranskat)abstract
- The field of fault detection and diagnosis has been the subject of considerable interest in industry. Fault detection may increase the availability of products, thereby improving their quality. Fault detection and diagnosis methods can be classified in three categories: data-driven, analytically based, and knowledge-based methods. In this work, we investigated the ability and the performance of applying two fault detection methods to query data streams produced from hydraulic drive systems. A knowledge-based method was compared to a data-driven method. A fault detection system based on a data stream management system (DSMS) was developed in order to test and compare the two methods using data from real hydraulic drive systems. The knowledge-based method was based on causal models (fault trees), and principal component analysis (PCA) was used to build the data-driven model. The performance of the methods in terms of accuracy and speed, was examined using normal and physically simulated fault data. The results show that both methods generate queries fast enough to query the data streams online, with a similar level of fault detection accuracy. The industrial applications of both methods include monitoring of individual industrial mechanical systems as well as fleets of such systems. One can conclude that both methods may be used to increase industrial system availability
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| 3. |
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| 4. |
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| 5. |
- Frostenson, Magnus, et al.
(författare)
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Hållbarhetsredovisning i svensk detaljhandel : Roll, relevans och nytta
- 2013
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Rapporten presenterar resultaten från forskningsprojektet ”Hållbarhetsredovisning och interna organisatoriska processer för ökad hållbarhet”. Syftet med projektet har varit att undersöka vilken betydelse hållbarhetsredovisning har för handelsföretags interna organisatoriska processer för ökad hållbarhet samt, att öka kunskapen om hur dessa processer konkret kan bidra till ökad hållbarhet inom handeln. Projektet bygger både på en bred översikt över hur handelsföretag kommunicerar sitt hållbarhetsarbete via hållbarhetsredovisningar och på fördjupade studier av hur ett fåtal större handelsföretag internt arbetar med hållbarhetsprocesser och hur detta kan relateras till just hållbarhetsredovisningens roll. Denna rapport presenterar de olika delstudiernas resultat på ett relativt övergripande plan och knyter dem till de forskningsfrågor som projektet har utgått ifrån. I den första delstudien visas att en relativt liten andel av handelsföretagen använder sig av hållbarhetsredovisning över huvud taget. Det finns heller inte en tydligt externt kommunicerad processförståelse av hållbarhetsarbetet. Kommunikationen kan ibland vara omfattande i rapporterna men det saknas oftast en sammanhängande redovisning av hur hållbarhetsfrågorna hanteras, med vilka medel, enligt vilken strategi och hur (eventuell) framgång mäts. Vad företag väljer att rapportera är också väldigt varierande. En del företag koncentrerar sig på hållbarhetsfrågor kopplade till kärnverksamheten medan andra fokuserar på aktiviteter som ligger långt utanför kärnverksamheten. Utifrån de två kvalitativa delstudier som genomförts har betydelsen av hållbarhetsredovisning som instrument, dess roll och relevans kunnat identifieras. I de två fallföretag som använder sig av hållbarhetsredovisning går det att urskilja ett antal funktioner av redovisningen som kommer till uttryck i högst varierande grad. Vi identifierar här hållbarhetsredovisningen som motor för hållbarhetsarbetet, uppföljningsdokument av hållbarhetsarbetet och som profileringsdokument för företaget. En övergripande iakttagelse är att hållbarhetsredovisningen inte entydigt kan knytas till någon av dessa roller utanuppvisar aspekter av samtliga. Den är exempelvis inte en motor för hållbarhetsarbetet i stark mening utan har en plats i ett vidare hållbarhetssammanhang som företaget verkar inom. Relevansen av hållbarhetsredovisningen diskuteras i kontrast till företag som inte använder sig av detta instrument. Här framförs argument från de olika fallföretagen av högst skiftande karaktär. Redovisningen beskrivs i olika utsträckning som irrelevant, delvis relevant och väldigt relevant för hållbarhetsarbetet. Utifrån det som har framkommit av studierna identifierar vi tre åtgärder som kan göra relevansen av hållbarhetsredovisningen större. Dessa är: - Indikator- och nyckeltalsanvändning som prestationsmätning snarare än leveransposter från enskilda enheter i organisationen. - Synkronisering av vad hållbarhetsredovisning är och förutsätts betyda i organisationen i förhållande till både hållbarhetsarbetet i stort och övergripande strategier och målsättningar (inte bara på hållbarhetsområdet). - Fasta strukturer och roller för arbetet med hållbarhetsredovisning för att klargöra ägarförhållandet till redovisningen.
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| 6. |
- Frostenson, Magnus, et al.
(författare)
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Organising Corporate Responsibility Communication through Filtration : A study of web communication patterns in Swedish retail
- 2011
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Ingår i: Journal of Business Ethics. - : Springer Science and Business Media LLC. - 0167-4544 .- 1573-0697. ; 100:1, s. 31-43
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Tidskriftsartikel (refereegranskat)abstract
- Corporate responsibility (CR) communication has risen dramatically in recent years, following increased demands for transparency. One tendency noted in the literature is that CR communication is organised and structured. Corporations tend to professionalise CR communication in the sense that they provide information that corresponds to demands for transparency that are voiced by certain stakeholders. This also means that experts within the firm tend to communicate with professional stakeholders outside the firm. In this paper, a particular aspect of the organisation of CR communication is examined, a phenomenon that we refer to as the ‘filtration effect’. By comparing CR communication in parent companies and their subsidiaries, we show empirically that there is considerably less CR communication at the subsidiary level compared to the parent level. We see filtration as a sign of conscious organising of CR communication that implies particular attention to certain stakeholder groups with clearly defined demands and expectations on companies. The strong filtration effect noted in the study suggests that CR communication does not seem to be very much adapted to customers, which may be problematic both from a communicative and ethical perspective. The study covers Sweden’s 206 largest retail firms.
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| 7. |
- Frostenson, Magnus, et al.
(författare)
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The internal significance of codes of conduct in retail companies
- 2012
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Ingår i: Business Ethics. A European Review. - : Wiley. - 0962-8770 .- 1467-8608. ; 21:3, s. 263-275
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Tidskriftsartikel (refereegranskat)abstract
- The paper focuses on the significance of codes of conducts (CoCs) in the internal work context of two retail companies. A stepwise approach is used. First, the paper identifies in what way employees use and refer to CoCs internally. Second, the function and relevance of CoCs inside the two companies are identified. Third, the paper explains why CoCs tend to function in the identified ways. In both cases, the CoCs are clearly decoupled in the sense that they do not concern the immediate work context of the employees. Counter-intuitively, this facilitates the process of establishing the CoCs. Even though the CoCs are not directly relevant for the employees, they are accepted and embraced both with regard to contents, focus and function. Above all, the CoCs seem to confirm and even strengthen employee identity. On the basis of these observations, it is suggested that CoCs should not only be valued in light of their direct organisational consequences or lack of such consequences. The issue is not just whether CoCs are decoupled or not. Rather, it is argued that researchers should consider more closely a two-level analysis which takes into account not only the concrete application of CoCs but also their function and meaning. An implication of this is that what might appear as a decoupled code cannot be dismissed as irrelevant to the ‘core’ of the organisation.
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| 8. |
- Khodadad, Davood, et al.
(författare)
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Single-shot dual-polarization holography : measurement of the polarization state of a magnetic sample
- 2015
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Ingår i: SPECKLE 2015. - : SPIE - International Society for Optical Engineering. - 9781628418781
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Konferensbidrag (refereegranskat)abstract
- In this paper a single-shot digital holographic set-up with two orthogonally polarized reference beams is proposed to achieve rapid acquisition of Magneto-Optical Kerr Effect images. Principles of the method and the background theory for dynamic state of polarization measurement by use of digital holography are presented. This system has no mechanically moving elements or active elements for polarization control and modulation. An object beam is combined with two reference beams at different off-axis angles and is guided to a detector. Then two complex fields (interference terms) representing two orthogonal polarizations are recorded in a single frame simultaneously. Thereafter the complex fields are numerically reconstructed and carrier frequency calibration is done to remove aberrations introduced in multiplexed digital holographic recordings. From the numerical values of amplitude and phase, a real time quantitative analysis of the polarization state is possible by use of Jones vectors. The technique is demonstrated on a magnetic sample that is a lithographically patterned magnetic microstructure consisting of thin permalloy parallel stripes.
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| 9. |
- Koumpouras, Konstantinos, et al.
(författare)
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A majority gate with chiral magnetic solitons
- 2018
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Ingår i: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 30:37
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Tidskriftsartikel (refereegranskat)abstract
- In magnetic materials, nontrivial spin textures may emerge due to the competition among different types of magnetic interactions. Among such spin textures, chiral magnetic solitons represent topologically protected spin configurations with particle-like properties. Based on atomistic spin dynamics simulations, we demonstrate that these chiral magnetic solitons are ideal to use for logical operations, and we demonstrate the functionality of a three- input majority gate, in which the input states can be controlled by applying an external electromagnetic field or spin-polarized currents. One of the main advantages of the proposed device is that the input and output signals are encoded in the chirality of solitons, that may be moved, allowing to perform logical operations using only minute electric currents. As an example we illustrate how the three input majority gate can be used to perform logical relations, such as Boolean AND and OR.
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| 10. |
- Lindström, John, et al.
(författare)
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Defining Functional Products through their constituents
- 2015
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Ingår i: International Journal of Product Development. - : InderScience Publishers. - 1477-9056 .- 1741-8178. ; 20:1, s. 1-24
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Tidskriftsartikel (refereegranskat)abstract
- Based on empirical studies combined with a literature review, the paper proposes a comprehensive framework defining Functional Products (FP) through their constituents. The framework adds additional specificity to the literature by identifying and discussing existing and emerging constituents of FP, shedding further light on what is needed to create a long and trustful win-win situation between providers and customers in an FP context
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