| 1. |
- Persson, Fredrik, et al.
(författare)
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USING SIMULATION TO DETERMINE THE SAFETY STOCK LEVEL FOR INTERMITTENT DEMAND
- 2017
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Ingår i: 2017 WINTER SIMULATION CONFERENCE (WSC). - : IEEE. - 9781538634288 ; , s. 3768-3779
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Konferensbidrag (refereegranskat)abstract
- Safety stock calculations are difficult for products with intermittent demand, long production lead times, and high monetary values. Theoretically, forecasts can be used to reduce the need for safety stocks. A high precision forecast minimizes the need for safety stock and forecast evaluation measurements can be used to calculate the safety stock level. However, a more realistic determination of safety stock levels can he obtained by simulation. In this paper, simulation is used to model and experiment on a case with three end products in order to determine the relationship between safety stock levels and service levels. Also, a comparison is made with theoretically calculated safety stocks to see how well basic theoretical models for safety stock calculations fulfill the requirements of service level. The result is that simulation can provide a much more accurate determination of safety stock levels for intermittent demands than theoretical calculations.
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| 2. |
- Espinoza, Fredrik, et al.
(författare)
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Analysis of Open Answers to Survey Questions throughInteractive Clustering and Theme Extraction
- 2018
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Ingår i: Proceedings of Conference on Human Information Interaction & Retrieval. - New York, New York, USA : ACM Digital Library. ; , s. 317-320
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Konferensbidrag (refereegranskat)abstract
- This paper describes design principles for and the implementation of Gavagai Explorer—a new application which builds on interactive text clustering to extract themes from topically coherent text sets such as open text answers to surveys or questionnaires.An automated system is quick, consistent, and has full coverage over the study material. A system allows an analyst to analyze more answers in a given time period; provides the same initial results regardless of who does the analysis, reducing the risks of inter-rater discrepancy; and does not risk miss responses due to fatigue or boredom. These factors reduce the cost and increase the reliability of the service. The most important feature, however, is relieving the human analyst from the frustrating aspects of the coding task, freeing the effort to the central challenge of understanding themes. Gavagai Explorer is available on-line at http://explorer.gavagai.se
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| 3. |
- Gebert Persson, Sabine, et al.
(författare)
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Public and private networks in tourism – : barriers to network identity construction and commitmen
- 2019
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Konferensbidrag (refereegranskat)abstract
- IntroductionDestinations all over the world encompass a broad range of stakeholders who all aspire to increase the tourism industry to accomplish regional development. At these destinations, there are many different stakeholders, who have mutual interest in a specific region, and there are different attempts to promote cooperation for joint efforts to attract visitors. Moreover, there is an increasing drive for municipalities to influence the tourism business as part of their regional development (Tillväxtverket, 2017).However, the aforementioned development of destinations has proven to involve competing interests between local, national and international stakeholders. Although private enterprises, the municipalities and on-governmental organizations, and residents have a common, or at least partly overlapping, interest in the development of a specific destination, competing interests will occasionally occur (c.f. Elbe et al., 2018). For instance, private businesses, like small local entrepreneurs, could be in direct competition with national or international corporations, despite the fact that they may have much to gain from joint marketing efforts (c.f. investment in a common brand). Similarly, public1organizations have a shared interest in the development of the tourism industry to increase tax revenues and job creation. However, municipalities have a greater responsibility for communities and its residents.As in many other sectors, public and private interactions are common within the tourism industry due to an overall reduction in public sector funding (Valente et al., 2015). Relationships between public and private actors are also set up to conjointly pool resources, share risks in the process of building, maintaining and developing public services (Keränen, 2017). Interactions between public-private actors have been acknowledged as important since these relationships enable firms to influence decisions within areas such as the public sector, rules and actions that can affect how the firm is perceived as legitimate or not (Hadjikhani, Lee, & Ghauri, 2008; Jansson, Saqib, & Sharma, 1995) but also as ways to develop new and existing resources. However, research has shown that uncertainty tends to be rather high in these relationships and the roles that the actors play are consequently dynamic and unclear. This in turn also affects how the actors perceive the cooperation between public and private actors (Keränen, 2017) and their commitment to these types of networks (Elbe et al., 2018). The sought after commitment would be enhanced if a mutual identity could be constituted; still the identity is established from how the stakeholders perceive their roles and relations to each other. So how could the identity of public actors merge with the identity of private actors to establish a mutual and common identity?Despite the apparent advantage to create a network to coordinate mutual, or at least overlapping, interests, it has proven to entail a number of difficult issues of which some will be addressed below. The combination of private and public stakeholders in one organization may have implications for its role and commitments (c.f. Elbe et al. 2009; 2018) i.e. it could influence the perceived identity construction of its constituents. The combination of public and private interests in the same organization could create tension; one perspective could have precedence over the other. For instance, if a publicly funded organization considers it to be its mission to only enhance businesses, there are stakeholder who could be overlooked, such as permanent residents, community services, and other lines of industry. Although the established networks are intended to work towards common goals, there may still be implicit and ambiguous goals, roles and identity formations.2The organizing of public and private interests in order to transform a place and its characteristics into a destination has proven to be a complex process. More research is needed in order to bring further clarity into factors affecting these types of relationships in terms of activities and resources (de Araujo and Bramwell, 2002) as well as how this affects the actors. Although there is a growing scholarly interest in public-private relationships, additional knowledge is needed on how the processes of these types of cooperation evolve (de Araujo and Bramwell, 2002). This is especially so in the context of created networks where the network is constructed rather than emerging and where the aim is to foster and manage activities, resource interactions and actor bonds.This paper sets out to further the understanding of interaction processes where public and private actors attempt to find ways to cooperate on a common issue. This is done by analyzing how the identity of a created network, consisting of public and private actors, develops over time. This paper focuses on explaining how a created network develops over time and why it evolves in the way it does. The purpose is to identify possible barriers to identity construction in a created network consisting of public and private actors. This is done through a case taking its point of departure in the decision of a major infrastructural investment in a destination in Sweden: the building of a new cruise quay on Gotland.Created public-private cooperation – previous research.Interactions between public-private actors have been acknowledged as important since these relationships enable firms to influence decisions within different areas such as the public sector, rules and actions (Keränen, 2017; Elbe et al., 2018) but also as ways to develop new and existing resources. These co-operations are encouraged by governments in many countries as interactions can facilitate the discussions and decisions related to how different activities evolve and are coordinated as well as how public resources are distributed. Moral responsibility and a way to recover citizens’ trust for politicians’ abilities to deliver on electoral pledge when resources are scarce has been emphasized as a reason for cooperation between public and private actors (Velotti, Botti & Vesci, 2012). In a tourism context, private-public cooperation can also increase the competitive advantage of destinations (Kotler et al., 1993).Over the last decades, a growing number of designated organizations for the coordination of tourist actors have been established using the concept of: Destination Management Organizations, DMO (c.f. Elbe et al. 2009). According to UNWTO (2018), the DMO’s3role should, “be to lead and coordinate activities under a coherent strategy in pursuit of this common goal.” The argument in research, and in practice, has been that these destination organizations can manage marketing and coordinate different actors from varying sectors in the society. Through this, it is assumed that the destination through facilitation of interactions among local actors and creation of networks can stimulate economic growth (Elbe et al., 2018). Hence, specific organizations are politically created to facilitate regional development. In addition, DMOs are proposed as a coalition of many organizations and interest although in practice, these organizations have proven to be composed in different ways, with varying performance (Tillväxtverket 2017). In order to understand the accomplishment the sought-after coordination of diverse stakeholder interests, a network approach has been suggested that encompasses inter-organizational relations (Elbe et al. 2018). The proposed network approach could take into account relations between organizations, not only limited to intra-organizational management models that do not encompass all stakeholders.Despite the numerous potential advantages of public-private interactions, they can be time- consuming and difficult as the participants come from different sectors and with deviating interests. Therefore, actors can perceive a risk that their power and influence may decrease. This can also lead to a lack of trust between the actors (de Araujo & Bramwell, 2002).Tensions and paradoxesInteraction between business actors are built around an economic rational. An assumption is that without economic incentives, interactions between business actors in networks will not come about (Håkansson, 1982; Finke et al., 2017). Different types of resources such as financial resources (capital), physical resources (time, technologies, people) and informational resources (knowledge) are exchanged and combined in new and unique ways through the interactions. Resources are through inherently dynamic and can always be used in new combinations within one relationship or in other relationships (Baraldi et al., 2012). An important condition and a factor influencing the interaction processes are the norms and perceptions of what constitutes the rules of the game. Through the interactions new norms for exchange can form and influence the continuation of the exchange. Whether to engage in the cooperation or not will be affected by previous experiences and expectations as expressed by Mousas and Ford (2009, p. 497): “Recurrent episodes are affected by the perceptions of the participants of their previous interactions and by their expectations of the future.” These exchange relationships, constitute the context in which interaction4processes between actors takes place (Easton & Håkansson, 1996; Håkansson & Ford, 2002; Håkansson & Waluszewski, 2002, 2007; Ritter, 2000).In tourist destinations, many of the resources used to attract tourists are public and common goods. The question of who owns these common goods is not always clear. Beaches, lakes, museums, culture heritage buildings are all resources that can attract tourists but that are public. Exchange relationships and agreement on how these public resources are exploited becomes essential for the survival of those organizations involved in developing act
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| 4. |
- Karlsson, Fredrik, et al.
(författare)
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Sensor Fused Indoor Positioning Using Dual Band WiFi Signal Measurements
- 2015
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Ingår i: 2015 European Control Conference (ECC). - 9783952426937 ; , s. 1669-1672
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Konferensbidrag (refereegranskat)abstract
- In this paper, signal strengths from known WiFi access points are used together with a particle filter to perform indoor navigation. It is shown that more information is obtained by using signals of both 2.4 and 5.0 GHz, compared to using only one frequency. Thus, using both frequencies provides a more accurate positioning. The second contribution is an algorithm where WiFi measurements are combined with pedestrian dead reckoning (PDR), which is based on step counting using an accelerometer and hypotheses of the heading using a gyroscope. This was found to provide further accuracy compared to more conventional methods.
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| 5. |
- Sahlgren, Magnus, et al.
(författare)
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The Gavagai Living Lexicon
- 2016
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Ingår i: 10th edition of the Language Resources and Evaluation Conference, 23-28 May 2016, Portorož (Slovenia). - : ELRA.
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Konferensbidrag (refereegranskat)abstract
- This paper presents the Gavagai Living Lexicon, which is an online distributional semantic model currently available in 14 different languages. We describe the underlying distributional semantic model, and how we have solved some of the challenges in applying such a model to large amounts of streaming data. We also describe the architecture of our implementation, and discuss how we deal with continuous quality assurance of the lexicon.
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| 6. |
- Bashir, Tariq, 1981-, et al.
(författare)
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Cellulosic Smart Textile Fibers based on Organic Electronics
- 2016
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Konferensbidrag (refereegranskat)abstract
- The paradigm shift of merging structural properties of materials with other functionalities prevails and cellulose based fibres are no exception. For the realisation of so called smart materials, including smart textiles, electrical conductivity is of special importance, enabling sensorics, signal transmission, energy supply, energy generation, and actuation. We here discuss taking use of the advancement within the organic electronics community of conjugated polymeric systems producing smart textile fibres for inclusion into garment as well as interior and technical textiles. Specifically, poly(3,4-ethylenedioxythiophene) known as PEDOT is studied as a model system. PEDOT has relevance being a working horse within the organic electronics community. Our emerging pilot line is based on creating conductivity by vapour polymerization of EDOT monomers on an oxidant coated textile fibre where these could be taken from arrange of materials. Here we focus on cellulose based fibres. It is shown that Tencell-Lyocell is a suitable substrate offering many anchoring sites and that multiple depositions with layers deposited directly on each other decreased the resistance from 5.1 (± 1.6) kΩ/10 cm to 1.0 (± 0.1) kΩ/10 cm, for one layer and multiple layers respectively. Furthermore, adding 15 wt. % of the copolymer PEG-PPG-PEG to the oxidant solution decreased the resistance from 6.8 (± 1.2) kΩ/10 cm to 3.9 (± 0.8) kΩ/10 cm.
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| 7. |
- Fornander, Louise, 1984, et al.
(författare)
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Using nanofluidic channels to probe dynamics of RAD51-Filaments
- 2015
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Ingår i: 18th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2014. - 9780979806476 ; , s. 1826-1828
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Konferensbidrag (refereegranskat)abstract
- Using nanochannels, passivated with a lipid bilayer to avoid sticking of proteins, we study Rad51 filaments bound to single- and double stranded DNA. We demonstrate how we can discern different properties of the filaments by studying them at different degrees of confinement. Unlike the bacterial homologue RecA, that forms homogeneous filaments along DNA, Rad51 forms heterogeneous filaments containing both rigid kinks as well as flexible regions. Varying the counterion, the DNA substrate as well as the initial protein concentration, we try to understand the factors governing the structure of the filaments.
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| 8. |
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| 9. |
- Hansson, Fredrik, et al.
(författare)
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Didaktisk bildning som alternativ till PCK
- 2016
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Vilka kunskaper är det som skapar själva lärarprofessionen? I högskoleförordningen (SFS 1993:100) benämns en del av det som ”kunskaper i didaktik och ämnesdidaktik inklusive metodik” och det spänner alltså från övergripande undervisningsperspektiv till den enskilda lärarens praktik. Vi är intresserade av hur ”det stora” (värdegrund, kunskaper om globala utmaningar, ”citizenship education”, didaktiska teorier etc., eller om man så vill didaktisk bildning) kommer till uttryck i ”det lilla”, alltså praxis. Vi använder begreppet didaktisk bildning som ett fylligare och mer mångbottnat alternativ till det anglosaxiska ”Pedagogical Content Knowledge” (PCK), som under senare år har gjort tydliga insteg i svensk ämnesdidaktisk forskning. PCK tar sin utgångspunkt i frågan vilka didaktiska kunskaper som den gode ämnesläraren behöver. Kansanen (2009) menar att PCK fokuserar på den didaktiska hur-frågan, medan den tyska didaktiktraditionen är inriktad på varför-frågan och dess följder för praxis. Med begreppet didaktisk bildning vill vi således anslå ett perspektiv som riktar blicken såväl inåt – mot det som sker i klassrummet – som utåt – mot exempelvis debatt, diskurser och traditioner som påverkar läraren. Den didaktiskt bildade läraren har en mångfacetterad förståelse för undervisningsämnet (inklusive goda kunskaper både i och om ämnet) och problematiserar dess selektiva traditioner. Hen har kunskap, bildning och handlingskompetens att självständigt fatta didaktiska beslut som gör att ”det stora” kommer till uttryck i ”det lilla”. Tillsammans representerar vi tre olika ämnesdidaktiska spår: språk- och litteraturdidaktik, SO-didaktik respektive NO-didaktik.
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| 10. |
- Jonsson, Erik, et al.
(författare)
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Apatite-iron oxide-hosted REE mineralisation at Kopslahyttan, NW Bergslagen, Sweden
- 2015
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Ingår i: Mineral Resources In A Sustainable World. - 9782855550664 ; , s. 781-784
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Konferensbidrag (refereegranskat)abstract
- Of the different types of REE mineralisation known from the Fennoscandian shield, the Palaeoproterozoic apatite-iron oxide ores of Kiruna type represent one resource type with significant potential. Here we describe an REE-rich apatite-magnetite mineralisation from the classic Bergslagen ore province in south central Sweden. Associated with moderately to weakly REE-enriched magnetite mineralisation of banded and vein types, the most apatite-rich occurrence at Kopslahyttan shows REE enrichment that is similar in both magnitude and pattern to other Kiruna type deposits. Yet, the present REE mineralogy is wholly dominated by monazite-(Ce), allanite-(Ce) and LREE-enriched epidote, the latter two often occurring as zoned crystals or aggregates. Minor xenotime-(Y) also occurs, and titanite locally hosts minor Y+HREE. The abundant fluorapatite is suggested to have been an additional, original host for REE, prior to fluid-mediated alteration leading to wholesale remobilisation of REE from the apatite. This remobilisation included dissolution-reprecipitation processes that lead to the nucleation of monazite in fluorapatite, but probably also further transport and precipitation as e.g. allanite/REE-epidote, through reactions with locally common silicates. In addition, we suggest that very coarse grained, variably Th-bearing monazite present in the mineralisation may have been a primary REE phase, in marked contrast to most other deposits of this type.
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