Zoekresultaten

Resource-Efficient Image Buffer Architecture for Neighborhood Processors

Neighborhood image processing operations on Field Programmable Gate Array (FPGA) are considered as memory intensive operations. A large memory bandwidth is required to transfer the required pixel data from external memory to the processing unit. On-chip image buffers are employed to reduce this data transfer rate. Conventional image buffers, implemented either by using FPGA logic resources or embedded memories are resource inefficient. They exhaust the limited FPGA resources quickly. Consequently, hardware implementation of neighborhood operations becomes expensive, and integrating them in resource constrained devices becomes unfeasible. This paper presents a resource efficient FPGA based on-chip buffer architecture. The proposed architecture utilizes full capacity of a single Xilinx BlockRAM (BRAM36 primitive) for storing multiple rows of input image. To get multiple pixels/clock in a user defined scan order, an efficient duty-cycle based memory accessing technique is coupled with a customized addressing circuitry. This accessing technique exploits switching capabilities of BRAM to read 4 pixels in a single clock cycle without degrading system frequency. The addressing circuitry provides multiple pixels/clock in any user defined scan order to implement a wide range of neighborhood operations. With the saving of 83% BRAM resources, the buffer architecture operates at 278 MHz on Xilinx Artix-7 FPGA with an efficiency of 1.3 clock/pixel. It is thus capable to fulfill real time image processing requirements for HD image resolution (1080 × 1920) @103 fcps.

Audiomotor transformations in improvising and score-dependent musicians

The realization of one’s musical ideas at the keyboard is dependent on the ability to transform sound into movement, a process called audiomotor transformation. Using fMRI, we investigated cerebral activations while classically‐trained improvising and non‐improvising musicians imagined playing along with recordings of familiar and unfamiliar music excerpts. We hypothesized that audiomotor transformation would be associated with the recruitment of dedicated cerebral networks, facilitating aurally‐cued performance. Results indicate that while all classically‐trained musicians engage a left‐hemisphere network involved in motor skill and action recognition, only improvising musicians additionally recruit a right dorsal frontoparietal network dedicated to spatially‐driven motor control. Mobilization of this network, which plays a crucial role in the real‐time transformation of imagined or perceived music into goal‐directed action, may be held responsible not only for the stronger activation of auditory cortex we observed in improvising musicians in response to the aural perception of music, but also for the superior ability to play ‘by ear’ which they demonstrated in a follow‐up study. The results of this study suggest that the practice of improvisation promotes the implicit acquisition of hierarchical music syntax which is then recruited in top‐down manner via the dorsal stream during music performance.

Time Line Gallery

Deze publicatie is een voortvloeisel van het Time line Gallery project. In dit project bundelden ontwerpbureau DesignArbeid, het lectoraat Image in Context van Academy Minerva en kunstruimte Sign de krachten om jonge kunstenaars in staat te stellen om in door henzelf gevormde teams de mogelijkheden van de publieke ruimte begin 21 eeuw te onderzoeken en zichtbaar te maken. De straat als galery waarin projecten in een tijdslijn na elkaar eigen vormen van counter public space (Klug ..) kunnen realiseren. De kunstenaars zetten zich uiteen met actuele kwesties waarvoor nieuwe vormen van uitwisseling en participatie werden ontwikkeld: de klimaatcrisis tastbaar in het stijgende water, de rol van de vrouw binnen de studentenvereniging, vervreemding in het publiek domein, ons koloniaal verleden zichtbaar in onze publieke ruimte, propaganda achter grote stadsevents, het gemak waarmee ons fakenews op de mouw gespeld kan worden en de wijze waarop publiek en privaat domein in elkaar overlopen.De vraag die voor ons allen leidend is: Hoe kunnen kunstenaars en ontwerpers interventies doen die eraan bijdragen dat we als autonoom denkende mensen weer verbinding krijgen met wat Bruno Latour (2019) het Aardse noemt. Het Aardse als zijnde een concept dat ons helpt om de richting aan te geven waarheen we ons moeten bewegen in een bewustzijn dat de wereld niet meer bestaat uit een omgeving waar mensen zich in bevinden, maar uit een krachtenveld, een ecologie, waar we onderdeel van zijn. De onderzoekers van het lectoraat zoeken de conceptuele invalshoeken die ons helpen om zichtbaar te maken welke mogelijkheden de kunst heeft om het hoofd te bieden aan de vele vormen van propaganda en disciplinering in het begin van de 21 e eeuw die dit onmogelijk willen maken. Daarom vindt u in deze publicatie naast een schets van de verschillende interventies die de deelnemende kunstenaars ontwikkelden, ook de verschillende conceptuele perspectieven waar de onderzoekers uit het lectoraat mee werken.De hier gepresenteerde artistieke praktijken zijn een moment in de ontwikkeling van de kunstenaars, het gevolg van een scala aan ontmoetingen die eraan vooraf zijn gegaan en de consekwentie van een dynamiek die ze op een geven moment met elkaar in gang hebben durven zetten. Zonder de moed tot handelen was er nooit iets gebeurd. De gepresenteerde concepten zijn de diepe gronden waar een onderzoeker pas na verloop van tijd op durft te gaan bouwen. Deze concepten kunnen iets teweegbrengen. In de ontmoetingen kan het concept zich gronden en verbreden en kunnen de artistieke praktijken nieuwe betekenislagen krijgen. Samen helpen ze ons reflecteren op de nieuwe rollen van kunstenaars en ontwerpers in de openbare ruimte als publiek domein.

Using brain potentials to functionally localise stroop-like effects in colour and picture naming : perceptual encoding versus word planning.

The colour-word Stroop task and the picture-word interference task (PWI) have been used extensively to study the functional processes underlying spoken word production. One of the consistent behavioural effects in both tasks is the Stroop-like effect: The reaction time (RT) is longer on incongruent trials than on congruent trials. The effect in the Stroop task is usually linked to word planning, whereas the effect in the PWI task is associated with either word planning or perceptual encoding. To adjudicate between the word planning and perceptual encoding accounts of the effect in PWI, we conducted an EEG experiment consisting of three tasks: a standard colour-word Stroop task (three colours), a standard PWI task (39 pictures), and a Stroop-like version of the PWI task (three pictures). Participants overtly named the colours and pictures while their EEG was recorded. A Stroop-like effect in RTs was observed in all three tasks. ERPs at centro-parietal sensors started to deflect negatively for incongruent relative to congruent stimuli around 350 ms after stimulus onset for the Stroop, Stroop-like PWI, and the Standard PWI tasks: an N400 effect. No early differences were found in the PWI tasks. The onset of the Stroop-like effect at about 350 ms in all three tasks links the effect to word planning rather than perceptual encoding, which has been estimated in the literature to be finished around 200-250 ms after stimulus onset. We conclude that the Stroop-like effect arises during word planning in both Stroop and PWI.

Teaching History in Bilingual Secondary Education in the Netherlands

Shifting cognitive frames through collective action to address grand challenges: A case study of a multi-stakeholder initiative in the apparel industry

Inter-organizational arrangements that aim to address social and environmental “grand challenges” often take the form of multi-stakeholder initiatives (MSIs) (also cross-sector partnerships or collaborations). Grand challenges -- problems characterized by knowledge uncertainty, dynamic complexity and value conflict -- require diverse organizations to join forces to resolve them. MSIs are complex and dynamic arrangements due to the constant change occurring in the external environment and in the dynamics of the collaboration, as each participating organization may have very different frames of reference and interests that impede action and continuity. Scholars have long recognized the tensions of conflicting logics that are inherent in MSIs and the challenges that MSIs face in reconciling incongruent organizational identities, goals or shared visions. Accordingly, MSIs need facilitators (i.e., ‘orchestrators’) to navigate the persistent and pervasive challenges of both reconciling conflicting logics and using complementary logics in such a way that the collaboration achieves collective goals. Our study examines how MSI orchestrators work to meet this challenge by shaping and shifting cognitive frames in the context of a mature organizational field. We investigate the mechanisms used to enable cognitive shifts in logic and highlight the role of orchestration in enacting frame shifts. Empirically, we examine an MSI in the apparel industry that aims to guide retailers and fashion brands in the implementation of recommerce and rental business models, thereby pushing the textile and apparel industry from linear to regenerative and circular use of textile resources. We identify several frames from the perspective of diverse stakeholders and uncover the four mechanisms that orchestrators use to influence frame shifts. We also see from our findings that orchestrators efforts to influence and navigate frame shifting is both emergent and planned as they attempt to navigate and manage the tensions and complexity that arise in multi-stakeholder initiatives focused on sustainability challenges.