2,292 research outputs found
Self-archiving practice and the influence of publisher policies in the social sciences
No full textAuthors in different disciplines exhibit very different behaviours on the so-called ‘green’ road to open access, i.e. self-archiving. This study looks at the self-archiving behaviour of authors publishing in leading journals in six social science disciplines. It tests the hypothesis that authors are self-archiving according to the norms of their respective disciplines rather than following self-archiving policies of publishers, and that, as a result, they are self-archiving significant numbers of publisher PDF versions. It finds significant levels of
self-archiving, as well as significant self-archiving of
the publisher PDF version, in all the disciplines
investigated. Publishers’ self-archiving policies have
no influence on author self-archiving practice
A “Local” Model of the Firm: Sticky prices and the Phillips Curve
No full textAssume a firm concerns itself exclusively with local shocks (copious citations including Lucas 1972 and Bomhoff 1983 validate that this type of assumption may be reasonable). Changes in a firm's production policy should occur when the actual demand in a period Dt suggests that the underlying demand function has shifted from expected demand E(Dt). Since firms face uncertainty, this is non-trivial and they must find a way to determining (given information from a single, current period) whether or not the underlying demand has changed or whether the firm has simply obtained a draw from its expected demand distribution.
In a simplified model, a firm can use a concept similar to a Statistical Hypothesis Test on E(Dt) = Dt to come to this conclusion. Rather than select an arbitrary confidence threshold (alpha), a firm can reverse the process and use the "marginal" alpha (where the hypothesis is just rejected or accepted) as its confidence that the mean has changed, allowing it to update its expectations to E(Dt+1) = (1-a) * E(Dt) + a * (Dt) and price accordingly. By weighting new demand information using this "confidence factor," the model introduces significant and persistent rigidity around NAIRU/equilibrium.
This model is also powerful because it explains the qualified success of threshold like behaivor in classical "menu cost" theories (as the threshold reflects the classic hypothesis test strategy), behavior similar to a learning model (via the weighted introduction of new data) and seeming information lags (via the low confidence in new information immediately after shifts), among others
Digital twin application in heritage facilities management: systematic literature review and future development directions
No full textThis paper aims to investigate the theoretical and practical links between digital twin (DT) application in heritage facilities management (HFM) from a life cycle management perspective and to signpost the future development directions of DT in HFM.This state-of-the-art review was conducted using a systematic literature review method. Inclusive and exclusive criteria were identified and used to retrieve relevant literature from renowned literature databases. Shortlisted publications were analysed using the VOSviewer software and then critically reviewed to reveal the status quo of research in the subject area.The review results show that DT has been mainly adopted to support decision-making on conservation approach and method selection, performance monitoring and prediction, maintenance strategies design and development, and energy evaluation and management. Although many researchers attempted to develop DT models for part of a heritage building at component or system level and test the models using real-life cases, their works were constrained by availability of empirical data. Furthermore, data capture approaches, data acquisition methods and modelling with multi-source data are found to be the existing challenges of DT application in HFM.In a broader sense, this study contributes to the field of engineering, construction and architectural management by providing an overview of how DT has been applied to support management activities throughout the building life cycle. For the HFM practice, a DT-cum-heritage building information modelling (HBIM) framework was developed to illustrate how DT can be integrated with HBIM to facilitate future DT application in HFM. The overall implication of this study is that it reveals the potential of heritage DT in facilitating HFM in the urban development context.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Design & Construction Managemen
A “Local” Model of the Firm: Sticky prices and the Phillips Curve
No full textAssume a firm concerns itself exclusively with local shocks (copious citations including Lucas 1972 and Bomhoff 1983 validate that this type of assumption may be reasonable). Changes in a firm's production policy should occur when the actual demand in a period Dt suggests that the underlying demand function has shifted from expected demand E(Dt). Since firms face uncertainty, this is non-trivial and they must find a way to determining (given information from a single, current period) whether or not the underlying demand has changed or whether the firm has simply obtained a draw from its expected demand distribution. In a simplified model, a firm can use a concept similar to a Statistical Hypothesis Test on E(Dt) = Dt to come to this conclusion. Rather than select an arbitrary confidence threshold (alpha), a firm can reverse the process and use the "marginal" alpha (where the hypothesis is just rejected or accepted) as its confidence that the mean has changed, allowing it to update its expectations to E(Dt+1) = (1-a) * E(Dt) + a * (Dt) and price accordingly. By weighting new demand information using this "confidence factor," the model introduces significant and persistent rigidity around NAIRU/equilibrium. This model is also powerful because it explains the qualified success of threshold like behaivor in classical "menu cost" theories (as the threshold reflects the classic hypothesis test strategy), behavior similar to a learning model (via the weighted introduction of new data) and seeming information lags (via the low confidence in new information immediately after shifts), among others.phillips curve
Managing HKU author reputations, enhancing HKU's reputation
No full textThe HKU "Knowledge Exchange" initiative has launched many separate projects that aim to make HKU researchers and their research highly visible. One of these projects is the creation of HKU ResearcherPages in HKU's institutional repository, that highlight the research and achievements of each professoriate staff at HKU, including their authored publications which are freely available in open access. These pages show download counts of these publications, and paper and citations metrics from Scopus and Thomson Reuter's ResearcherID These pages also allow the HKU author to manage, control, and take charge of how his or her digital presence, or reputation, is shown to the world. Newly aware of their digital presence, HKU authors now have the incentive and tools to correct errors, add missing publications, and otherwise burnish their reputation as shown in these HKU ResearcherPages, Scopus, and ResearcherID. The renown of their sponsoring university correspondingly shines brighter; as HKU paper and citation counts are positively amended, offers of contract research and research collaboration increase, and, invitations to speak and consult, appear as if by.., magic.published_or_final_versionThe World 100 Conference: Managing University Reputation in a Competitive World, Hong Kong, 22-23 June 2010
Relationships' sustainability: the case of German wheat-to-bread chain
No full textIn recent years there has been a shift in emphasis from transaction-based to more co-operative relationships, as chain members have recognised the need to invest in their supply chain relationships in order to protect their businesses. These non-arm’s-length relationships are capable of generating relational rents for chain partners. The main aim of this paper is to investigate why, in spite of the advantages of the non-arm’s-length relationships, some relationships do not continue. To enhance the understanding of the termination process, we identify and analyse the factors inducing relationship sustainability (continuation) as well as termination in the case of the German wheat-to-bread chain. The study built on the findings of relationship marketing approach that stresses the importance of building longer-term relationships with customers rather than carrying out individual transactions. In addition, the findings of modern microeconomic theories including transaction costs theory and industrial theory are taken into consideration. The empirical analysis is based on two data sets: First, a quantitative questionnaire survey and second, interviews with stakeholders of the wheat-to-bread chain were conducted, aiming at identifying the role of economic and behavioral dimensions of relationships for their termination. The questionnaire survey provides that businesses assess the relationships in the wheat-to-bread chain, being of high quality and long term duration. The results show that trust, satisfaction and commitment - the behavioural dimensions of relationships quality - are very high in the considered chain. Competitive price, competitive quality and supply continuity were identified as determinants mostly important for buyers’ satisfaction as directly influencing relationships’ performance. In addition, the results demonstrate that lack of trust is the reason why relationships do not develop or are terminated in the early phases of the relationship. In the long lasting relationships on the other hand, the reasons for termination are mostly of economic nature. The paper shows why sustainable relationships may enhance business’ competitiveness and analyses why in spite of it the relationships terminate. As the result of the research we understand the sustainable relationships as those relationships in that the costs for starting the relationship are exceeded by returns gained from the cooperation in time.economic relationships, sustainability, termination, Agribusiness,
Improvement of personnel assessment methods in company "DT Mobile"
No full textBakalaura darbā „Personāla novērtēšanas metožu pilnveidošana uzņēmumā „DT Mobile” autors pēta un izstrādā savus priekšlikumus personāla novērtēšanas metožu pilnveidošanai. Uzņēmums ir noteicis jaunus mērķus klientu apkalpošanas līmeņa paaugstināšanai, līdz ar to ir nepieciešams izstrādāt atbilstošas izmaiņas līdzšinējās novērtēšanas metodēs.
Bakalaura darbs veido 3 nodaļas. Pirmajā daļā ir apskatītas personāla novērtēšanas veidi un to definīcijas, mērķi un tiek aprakstītas personāla darbības novērtēšanā izmantojamas metodes, un pielietošanas iespējas, kā arī to trūkumi. Darba otrajā un trešajā nodaļā tiek izpētīta uzņēmumā esošās personāla novērtēšanas sistēmas un analizēti novērtēšanas rādītāji un problēmas novērtēšanas sistēmās. Noslēgumā autors ir apkopojis secinājumus un izstrādājis savus priekšlikumus personāla novērtēšanas metožu pilnveidošanai uzņēmumā „DT Mobile”.
Bakalaura darba apjoms ir 64 lapas, tajās izvietotas 3 nodaļas un 16 attēli, pievienoti 2 pielikumi.In the thesis work “Improvement of personnel assessment methods in company “DT Mobile” the author explores and develops proposals for personnel assessment methods improvement. The company has set the new goals for increasing the level of customer service, so it is necessary to develop appropriate changes in current assessment methods.
The thesis consists of three chapters. The first chapter examines personnel assessment methods and definitions, goals and describes uses and weaknesses. The second and third chapter examines the existing personnel assessment methods and analyzes the evaluation indicators and problems of appraisal systems. In conclusion, the author has summarized the conclusions and proposals for development of personnel assessment methods in company “DT Mobile”.
The thesis work consists of 64 pages, three chapters, 16 images, has been added two attachments
Fourier transform infrared spectroscopic study of intercalation of ethidium bromide in calf thymus DNA and poly(da dt), 1992
No full textAn 8 mole (base pair)/liter aqueous solution of DNA, and a 4 mmole (base pair) aqueous solution of Poly(dA dT) were prepared for the study of the physical mechanism of complexation with an ethidium bromide solution. A 4 mmole ethidium bromide solution was added to a 1 mL DNA solution in lOO/uL increments and was analyzed via Fourier Transform Infrared (FT IR) Spectroscopy. An infrared spectrum of the mixture after each incremental addition was obtained. The ratios of the ethidium bromide to DNA base pairs for the resulting solutions were as follows: 1/20, 1/10, 1/6.7, 1/5, 1/3.3, 1/2.9, 1/2.5, 1/2.2, and 1/2. The resulting infrared spectra of these solutions indicated that the interaction of ethidium bromide with DNA in aqueous media exhibits two different modes at different relative concentrations of DNA and ethidium bromide. The first type of interaction which is most prominent for the lower ratio mixtures (< 1/5) is intercalation. This interaction is characterized by a shift (Acm1) in the phosphate bands of DNA. The second type of interaction is groove binding of the ethidium bromide to DNA which is indicated by the growth of a new feature at 1260 wavenumber (cm1). A 2 mmole ethidium bromide solution was utilized for the preparation of Poly(dA dT)/ethidium bromide solutions resulting in solutions with the same ratios of ethidium bromide to Poly(dA dT) as those for the ethidium to DNA solutions. The spectra of the Poly(dA dT) solutions showed the shifting of the phosphate infrared bands just as the DNA complexes, but there was distinct splitting of the 1214 cm'1 band and the 1050 cm1. This splitting is due to the two different phosphate environments and phosphodiester environments of dA and dT
On Learning Discrete-Time Fractional-Order Dynamical Systems
No full textDiscrete-time fractional-order dynamical systems (DT-FODS) have found innumerable applications in the context of modeling spatiotemporal behaviors associated with long-term memory. Applications include neurophysiological signals such as electroencephalogram (EEG) and electrocorticogram (ECoG). Although learning the spatiotemporal parameters of DT-FODS is not a new problem, when dealing with neurophysiological signals we need to guarantee performance standards. Therefore, we need to understand the trade-offs between sample complexity and estimation accuracy of the system parameters. Simply speaking, we need to address the question of how many measurements we need to collect to identify the system parameters up to an uncertainty level. In this paper, we address the problem of identifying the spatial and temporal parameters of DT-FODS. The main result is the first result on non-asymptotic finite-sample complexity guarantees of identifying DT-FODS. Finally, we provide evidence of the efficacy of our method in the context of forecasting real-life intracranial EEG time series collected from patients undergoing epileptic seizures.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Team Sergio Pequit
Digital Twin of the Mooring Line Tension for Floating Offshore Wind Turbines
No full textThe number of installed Floating Offshore Wind Turbines (FOWTs) has doubled since 2017, quadrupling the total installed capacity, and is expected to increase significantly over the next decade. Consequently, there is a growing consideration towards the main challenges for FOWT projects: monitoring the system's integrity, extending the lifespan of the components, and maintaining FOWTs safely at scale. Effectively and efficiently addressing these challenges would unlock the wide-scale deployment of FOWTs. In this work, we focus on one of the most critical components of the FOWTs, the Mooring Lines (MoLs), which are responsible for fixing the structure to the seabed. The primary mechanical failure mechanisms in MoLs are extreme load and fatigue, both of which are functions of the axial tension. An effective solution to detect long term drifts in the mechanical response of the MoLs is to develop a Digital Twin (DT) able to accurately predict the behaviour of the healthy system to compare with the actual one. Authors will leverage operational data collected from the world's first commercial floating wind farm (Hywind Pilot Park1) in 2018, to investigate the effectiveness of the DT for the prediction of the MoL axial tension. The DT will be developed using state-of-the-art data-driven methods, and results based on real operational data will support our proposal. Accepted Author ManuscriptShip Design, Production and Operation
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