11,424 research outputs found

    Beam scanning by liquid-crystal biasing in a modified SIW structure

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    A fixed-frequency beam-scanning 1D antenna based on Liquid Crystals (LCs) is designed for application in 2D scanning with lateral alignment. The 2D array environment imposes full decoupling of adjacent 1D antennas, which often conflicts with the LC requirement of DC biasing: the proposed design accommodates both. The LC medium is placed inside a Substrate Integrated Waveguide (SIW) modified to work as a Groove Gap Waveguide, with radiating slots etched on the upper broad wall, that radiates as a Leaky-Wave Antenna (LWA). This allows effective application of the DC bias voltage needed for tuning the LCs. At the same time, the RF field remains laterally confined, enabling the possibility to lay several antennas in parallel and achieve 2D beam scanning. The design is validated by simulation employing the actual properties of a commercial LC medium

    “We Need a Big Revolution in Email Advertising”: Users’ Perception of Persuasion in Permission-based Advertising Emails

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    Persuasive tactics intend to encourage users to open advertising emails. However, these tactics can overwhelm users, which makes them frustrated and leads to lower open rates. This paper intends to understand which persuasive tactics are used and how they are perceived by users. We first developed a categorization of inbox-level persuasive tactics in permission-based advertising emails. We then asked participants to interact with an email inbox prototype, combined with interviews (N=32), to investigate their opinions towards advertising emails and underlying persuasive tactics. Our qualitative findings reveal poor user experience with advertising emails, which was related to feeling surveilled by companies, forced subscriptions, high prior knowledge about persuasive tactics, and a desire for more agency. We also found that using certain persuasive tactics on the inbox level is perceived as ethically inappropriate. Based on these insights, we provide design recommendations to improve advertising communication and make such emails more valuable to users

    An empirical investigation of the relationship between integration, dynamic capabilities and performance in supply chains

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    This research aimed to develop an empirical understanding of the relationships between integration, dynamic capabilities and performance in the supply chain domain, based on which, two conceptual frameworks were constructed to advance the field. The core motivation for the research was that, at the stage of writing the thesis, the combined relationship between the three concepts had not yet been examined, although their interrelationships have been studied individually. To achieve this aim, deductive and inductive reasoning logics were utilised to guide the qualitative study, which was undertaken via multiple case studies to investigate lines of enquiry that would address the research questions formulated. This is consistent with the author’s philosophical adoption of the ontology of relativism and the epistemology of constructionism, which was considered appropriate to address the research questions. Empirical data and evidence were collected, and various triangulation techniques were employed to ensure their credibility. Some key features of grounded theory coding techniques were drawn upon for data coding and analysis, generating two levels of findings. These revealed that whilst integration and dynamic capabilities were crucial in improving performance, the performance also informed the former. This reflects a cyclical and iterative approach rather than one purely based on linearity. Adopting a holistic approach towards the relationship was key in producing complementary strategies that can deliver sustainable supply chain performance. The research makes theoretical, methodological and practical contributions to the field of supply chain management. The theoretical contribution includes the development of two emerging conceptual frameworks at the micro and macro levels. The former provides greater specificity, as it allows meta-analytic evaluation of the three concepts and their dimensions, providing a detailed insight into their correlations. The latter gives a holistic view of their relationships and how they are connected, reflecting a middle-range theory that bridges theory and practice. The methodological contribution lies in presenting models that address gaps associated with the inconsistent use of terminologies in philosophical assumptions, and lack of rigor in deploying case study research methods. In terms of its practical contribution, this research offers insights that practitioners could adopt to enhance their performance. They can do so without necessarily having to forgo certain desired outcomes using targeted integrative strategies and drawing on their dynamic capabilities

    Machine learning and mixed reality for smart aviation: applications and challenges

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    The aviation industry is a dynamic and ever-evolving sector. As technology advances and becomes more sophisticated, the aviation industry must keep up with the changing trends. While some airlines have made investments in machine learning and mixed reality technologies, the vast majority of regional airlines continue to rely on inefficient strategies and lack digital applications. This paper investigates the state-of-the-art applications that integrate machine learning and mixed reality into the aviation industry. Smart aerospace engineering design, manufacturing, testing, and services are being explored to increase operator productivity. Autonomous systems, self-service systems, and data visualization systems are being researched to enhance passenger experience. This paper investigate safety, environmental, technological, cost, security, capacity, and regulatory challenges of smart aviation, as well as potential solutions to ensure future quality, reliability, and efficiency

    Benefits and Risks Measurement Model : In different managerial positions during RPA implementation

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    The emergent technologies have always been used for ameliorating business processes. Automation solutions and use of AI tools have increased the creation of more efficient and reliable processes. One of these automation solutions is robotic process automation that is used to automate software-based processes. Use of software systems have previously required human attention to work on different graphic user interfaces to read, fill, and combine data among the systems. Robotic process automation solutions offer a new way of working by automating repetitive manual tasks and creating more time for human work force to be creative. Implementation of modern technologies has its benefits and risks on various levels of the organisation. Change and adoption management is crucial to be up to date so the value from the implementation process can be captured and risks avoided in every position. Various measurement metrics and tools can help the management to monitor the ongoing process and to evaluate the outcome of the implementation. The aim of this thesis is to categorise the perceived benefits and risks of robotic process automation and the measurement metrics and tools to monitor them in different managerial positions during the implementation. The methods used for creating this categorised model are literature review as secondary data to create a theoretical model and a survey to industry experts to gather primary data to agree or disagree with the created model. The secondary data was researched to gather knowledge about different known benefits and risks models while trying to position their categorisation into project manager, developer, and customer service agent positions. The primary data gathered from the experts on the same managerial positions was used to strengthen the theoretical model. As conclusion, the final model represents the perceived benefits and risks under the managerial positions and measurement metrics and tools in general. The results show that the benefits and risks of robotic automation process implementation can be categorised under managerial positions to help the management to ensure the full value capture while ameliorating the business processes with the automation. Taking the categorised benefit dimensions and risk concerns into account during the implementation’s change management can help the organisations to be ready for the more advanced artificial intelligence solutions as the robotic process automation is referred as a steppingstone towards the forthcoming technological revolution

    Empowering Practitioners: A Conceptual Framework for Value Co-Creation through Smart Service Innovation Methodologies

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    Smart services offer great innovation potential by incorporating digital technologies into non-digital value-creation processes. As smart service innovation poses significant challenges to organizations, existing research has contributed to understanding and addressing this phenomenon by developing various methods, tools, and processes. Yet, the academic community often still fails to bridge the “last mile” and help practitioners apply this knowledge in their specific application contexts. This article outlines how research can empower practitioners by systematically providing methodological knowledge for smart service innovation. We review and contrast existing methodologies and present a conceptual framework for value co-creation through smart service innovation methodologies. In addition, we identify six essential resource types required in these methodologies and propose emergent research avenues to guide future contributions to smart service innovation research

    Knowledge-based Modelling of Additive Manufacturing for Sustainability Performance Analysis and Decision Making

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    Additiivista valmistusta on pidetty käyttökelpoisena monimutkaisissa geometrioissa, topologisesti optimoiduissa kappaleissa ja kappaleissa joita on muuten vaikea valmistaa perinteisillä valmistusprosesseilla. Eduista huolimatta, yksi additiivisen valmistuksen vallitsevista haasteista on ollut heikko kyky tuottaa toimivia osia kilpailukykyisillä tuotantomäärillä perinteisen valmistuksen kanssa. Mallintaminen ja simulointi ovat tehokkaita työkaluja, jotka voivat auttaa lyhentämään suunnittelun, rakentamisen ja testauksen sykliä mahdollistamalla erilaisten tuotesuunnitelmien ja prosessiskenaarioiden nopean analyysin. Perinteisten ja edistyneiden valmistusteknologioiden mahdollisuudet ja rajoitukset määrittelevät kuitenkin rajat uusille tuotekehityksille. Siksi on tärkeää, että suunnittelijoilla on käytettävissään menetelmät ja työkalut, joiden avulla he voivat mallintaa ja simuloida tuotteen suorituskykyä ja siihen liittyvän valmistusprosessin suorituskykyä, toimivien korkea arvoisten tuotteiden toteuttamiseksi. Motivaation tämän väitöstutkimuksen tekemiselle on, meneillään oleva kehitystyö uudenlaisen korkean lämpötilan suprajohtavan (high temperature superconducting (HTS)) magneettikokoonpanon kehittämisessä, joka toimii kryogeenisissä lämpötiloissa. Sen monimutkaisuus edellyttää monitieteisen asiantuntemuksen lähentymistä suunnittelun ja prototyyppien valmistuksen aikana. Tutkimus hyödyntää tietopohjaista mallinnusta valmistusprosessin analysoinnin ja päätöksenteon apuna HTS-magneettien mekaanisten komponenttien suunnittelussa. Tämän lisäksi, tutkimus etsii mahdollisuuksia additiivisen valmistuksen toteutettavuuteen HTS-magneettikokoonpanon tuotannossa. Kehitetty lähestymistapa käyttää fysikaalisiin kokeisiin perustuvaa tuote-prosessi-integroitua mallinnusta tuottamaan kvantitatiivista ja laadullista tietoa, joka määrittelee prosessi-rakenne-ominaisuus-suorituskyky-vuorovaikutuksia tietyille materiaali-prosessi-yhdistelmille. Tuloksina saadut vuorovaikutukset integroidaan kaaviopohjaiseen malliin, joka voi auttaa suunnittelutilan tutkimisessa ja täten auttaa varhaisessa suunnittelu- ja valmistuspäätöksenteossa. Tätä varten testikomponentit valmistetaan käyttämällä kahta metallin additiivista valmistus prosessia: lankakaarihitsaus additiivista valmistusta (wire arc additive manufacturing) ja selektiivistä lasersulatusta (selective laser melting). Rakenteellisissa sovelluksissa yleisesti käytetyistä metalliseoksista (ruostumaton teräs, pehmeä teräs, luja niukkaseosteinen teräs, alumiini ja kupariseokset) testataan niiden mekaaniset, lämpö- ja sähköiset ominaisuudet. Lisäksi tehdään metalliseosten mikrorakenteen karakterisointi, jotta voidaan ymmärtää paremmin valmistusprosessin parametrien vaikutusta materiaalin ominaisuuksiin. Integroitu mallinnustapa yhdistää kerätyn kokeellisen tiedon, olemassa olevat analyyttiset ja empiiriset vuorovaikutus suhteet, sekä muut tietopohjaiset mallit (esim. elementtimallit, koneoppimismallit) päätöksenteon tukijärjestelmän muodossa, joka mahdollistaa optimaalisen materiaalin, valmistustekniikan, prosessiparametrien ja muitten ohjausmuuttujien valinnan, lopullisen 3d-tulosteun komponentin halutun rakenteen, ominaisuuksien ja suorituskyvyn saavuttamiseksi. Valmistuspäätöksenteko tapahtuu todennäköisyysmallin, eli Bayesin verkkomallin toteuttamisen kautta, joka on vankka, modulaarinen ja sovellettavissa muihin valmistusjärjestelmiin ja tuotesuunnitelmiin. Väitöstyössä esitetyn mallin kyky parantaa additiivisien valmistusprosessien suorituskykyä ja laatua, täten edistää kestävän tuotannon tavoitteita.Additive manufacturing (AM) has been considered viable for complex geometries, topology optimized parts, and parts that are otherwise difficult to produce using conventional manufacturing processes. Despite the advantages, one of the prevalent challenges in AM has been the poor capability of producing functional parts at production volumes that are competitive with traditional manufacturing. Modelling and simulation are powerful tools that can help shorten the design-build-test cycle by enabling rapid analysis of various product designs and process scenarios. Nevertheless, the capabilities and limitations of traditional and advanced manufacturing technologies do define the bounds for new product development. Thus, it is important that the designers have access to methods and tools that enable them to model and simulate product performance and associated manufacturing process performance to realize functional high value products. The motivation for this dissertation research stems from ongoing development of a novel high temperature superconducting (HTS) magnet assembly, which operates in cryogenic environment. Its complexity requires the convergence of multidisciplinary expertise during design and prototyping. The research applies knowledge-based modelling to aid manufacturing process analysis and decision making in the design of mechanical components of the HTS magnet. Further, it explores the feasibility of using AM in the production of the HTS magnet assembly. The developed approach uses product-process integrated modelling based on physical experiments to generate quantitative and qualitative information that define process-structure-property-performance interactions for given material-process combinations. The resulting interactions are then integrated into a graph-based model that can aid in design space exploration to assist early design and manufacturing decision-making. To do so, test components are fabricated using two metal AM processes: wire and arc additive manufacturing and selective laser melting. Metal alloys (stainless steel, mild steel, high-strength low-alloyed steel, aluminium, and copper alloys) commonly used in structural applications are tested for their mechanical-, thermal-, and electrical properties. In addition, microstructural characterization of the alloys is performed to further understand the impact of manufacturing process parameters on material properties. The integrated modelling approach combines the collected experimental data, existing analytical and empirical relationships, and other data-driven models (e.g., finite element models, machine learning models) in the form of a decision support system that enables optimal selection of material, manufacturing technology, process parameters, and other control variables for attaining desired structure, property, and performance characteristics of the final printed component. The manufacturing decision making is performed through implementation of a probabilistic model i.e., a Bayesian network model, which is robust, modular, and can be adapted for other manufacturing systems and product designs. The ability of the model to improve throughput and quality of additive manufacturing processes will boost sustainable manufacturing goals

    Copular clauses in Malay: synchronic, diachronic, and typological perspectives

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    This thesis examines the copulas ialah and adalah in Malay on different levels of linguistic analysis, in different periods in time, and against different genetically related languages. Addressing the scarcity of research on copular clauses in Malay in all three areas, namely synchrony, diachrony, and typology, this thesis aims to serve as a point of reference for future study on nonverbal predication in Malay and beyond. The synchronic portion of the thesis begins with a demonstration of the monomorphemic nature of the two copulas, which no longer exhibit the morphosyntax, semantics, and information structure of the morphemes that they appear to comprise, viz. 3rd person ia, existential verb ada, and focus marker lah. Following that, several syntactic and semantic phenomena, including extraction from copular clauses, copular inversion, and overt vs. zero encoding of the copula, are investigated. Lastly, the derivation of clefts in Malay is examined, which I reveal to be a type of copular construction despite the absence of an overt copula. I then show that the derivation of a cleft feeds the further derivation of a pseudocleft via remnant movement. In the history of Malay, ialah and adalah are shown to have emerged relatively recently, that is towards the end of the Classical Malay era, circa the 18th to 19th century. Ialah grammaticalised from the combination of 3rd person pronoun ia and comment marker lah in a topical construction that involved left dislocation. Specifically, the topic was reanalysed as the canonical subject, which subsequently forced the resumptive pronoun to undergo Spec-to-Head reanalysis, resulting in ialah grammaticalising into a copula heading TP. Meanwhile, adalah grammaticalised from semantically vacuous support auxiliary ada, also in combination with comment marker lah. Both copulas originally developed from the need to provide a host for the comment marker as a way of avoiding a violation of the stray affix filter.   The typological survey of copular clauses in Austronesian reveals that syntactic alignment and word order play a central role in the emergence of copulas in a language. Of the 40 languages examined, all the 19 languages that have overt copulas are accusatively aligned, except the ergatively aligned Formosan language Puyuma, which entails that ergative-absolutive and split ergative languages within Austronesian are statistically very unlikely to have overt copulas. In addition to that, 20 of the 25 accusatively aligned languages have SVO word order, whilst all of the 9 ergatively aligned languages have VSO word order. The word order of the language is relevant as all but two of the 19 languages with overt copulas have SVO word order. In consideration of these findings, I argue that the correlation among the three factors is such that change from ergative to accusative alignment triggers change in word order from verb-initial order to verb-medial order, and that this is conducive to the emergence of overt copulas. Furthermore, word order plays a crucial role in the emergence of overt copulas as they may develop in topical constructions following reanalysis of the left-dislocated topic as the canonical subject, as argued in the diachronic portion of the thesis. Given this path of development, I argue that pronominal copulas have not been able to develop in the ergatively aligned Philippine-type languages due to the lack of the notion of subject and the absence of the canonical subject position, which prevents reanalysis of left-dislocated topics as canonical subjects and subsequently resumptive pronouns as copulas, as undergone by the Malay copula ialah. In addition to that, verbal copulas cannot develop from posture verbs in the Philippine-type languages because of the clash between the unergative nature of posture verbs and the unaccusative nature of the copula, which presents a problem in the Philippine-type languages due to the encoding of the agent argument on the verb in the actor voice. Besides, the strict intransitive nature of the copular clause is incompatible with other voice alternations such as the benefactive and the locative, as the trigger in these voice alternations is encoded as an applied argument, making the clause transitive. Verbs of becoming also cannot copularise in the Philippine-type languages via semantic bleaching of the inchoative aspect, due to the robust morphological marking of aspect on the verb

    What more can Software Development learn from Agile Manufacturing? Some pointers on the 20th anniversary of the Agile Manifesto

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    The concept of agility originated in manufacturing and was later adopted by the software development discipline. In this article we argue that in the process some important aspects of the agility theory have been either ignored or misinterpreted. A historical review of the evolving paradigms and practices in software development and manufacturing on the 20th anniversary of the Agile Manifesto (2001) suggests that if the ideas and principles underlying agility are faithfully implemented it would lead to significant improvement in the software development process
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