Search results for "Design"
showing 10 items of 5885 documents
The effects of using participatory working time scheduling software on working hour characteristics and wellbeing : a quasi-experimental study of irr…
2020
Background: Studies in the health care sector indicate that good work time control is associated with better perceived wellbeing but also with non-ergonomic work schedules, such as compressed work schedules. Participatory working time scheduling is a collaborative approach to scheduling shift work. Currently, there is a lack of information on whether working hour characteristics and employees' wellbeing in irregular shift work change after implementing participatory working time scheduling. Objective: To investigate the effects of using digital participatory working time scheduling software on working hour characteristics and well-being among Finnish hospital employees. Participants and met…
Present-day use of an empirical wave prediction method
2016
Knowledge of the offshore wave climate is key to the design of coastal engineering structures and to the study of shoreline evolution. To date, the available wave data have been limited both in time and space; even though there are several options for obtaining wave data calculated using complex numerical models at basin scale, design issues can in some cases be solved by means of simpler models. This paper shows whether, under certain conditions and in an enclosed basin, an old empirical model can provide results that are good enough to determine the design condition necessary for engineering purposes. The empirical model chosen to answer this question is called Sverdrup–Munk–Bretschneide…
User Psychology in Interaction Design: The Role of Design Ontologies
2008
In the various forms of interaction design, it is essential to analyze, understand, and predict human behavior. This is equally true with devices such as information systems that are meant to interact with people. The importance of these problems has inspired scientists to develop numerous approaches to investigate and explicate human actions. However, they have mainly been characterized by intuitive and folk psychological approaches to the human mentality in interaction. To improve the scientific foundations of design, we present here a psychology-based approach to collecting user knowledge, as well as a related design practice. The former can be called user psychology and the latter the a…
“Sicilia”. Una, nessuna, centomila Sicilie / ‘Sicilia’. One, no one and one hundred thousand Sicilies
2013
Sicilia, è una rivista che ancora oggi ha molto da raccontare e insegnare, nella sua assoluta visionarietà così costantemente in bilico tra l’essere un periodico visceralmente siciliana e ancor più palermitana e l’essere una rivista internazionale, contemporanea, poliglotta, sperimentale e proiettata verso nuovi scenari. Sicilia, senza timore di potere essere tacciata di inutile campanilismo, merita di essere studiata in modo ben più approfondito di quanto sia stato fatto sinora, attraverso un’attenta analisi condotta nei diversi ambiti disciplinari coinvolti tra le pieghe delle sue pagine. In questa sede proveremo ad approfondire il suo studio analizzando la rivista, quale complesso artefa…
La Sicilia del Design
2009
Se non si hanno parole migliori è bene adoperare quelle già scritte, specie se costruite dalle mani di Gesualdo Bufalino che con lucido e spietato amore disegna la sua terra. Delle tante Sicilie mi piacerebbe raccontarvi quella che pigramente, per non tradire del tutto la sua natura, si muove verso possibili scenari in cui il design, con i suoi tanti nomi, può dive n i re uno strumento per valorizzare il territorio denso di patrimoni, come quello dei beni culturali, dell’artigianato, dell’enogastronomia, patrimoni ricchi e altrettanto scarsamente valorizzati e comunicati. If you do not have better words it is good to use those already written, especially if built by the hands of Gesualdo Bu…
Location-Free Spectrum Cartography
2019
Spectrum cartography constructs maps of metrics such as channel gain or received signal power across a geographic area of interest using spatially distributed sensor measurements. Applications of these maps include network planning, interference coordination, power control, localization, and cognitive radios to name a few. Since existing spectrum cartography techniques require accurate estimates of the sensor locations, their performance is drastically impaired by multipath affecting the positioning pilot signals, as occurs in indoor or dense urban scenarios. To overcome such a limitation, this paper introduces a novel paradigm for spectrum cartography, where estimation of spectral maps rel…
Deep Completion Autoencoders for Radio Map Estimation
2022
Radio maps provide metrics such as power spectral density for every location in a geographic area and find numerous applications such as UAV communications, interference control, spectrum management, resource allocation, and network planning to name a few. Radio maps are constructed from measurements collected by spectrum sensors distributed across space. Since radio maps are complicated functions of the spatial coordinates due to the nature of electromagnetic wave propagation, model-free approaches are strongly motivated. Nevertheless, all existing schemes for radio occupancy map estimation rely on interpolation algorithms unable to learn from experience. In contrast, this paper proposes a…
Channel Gain Cartography via Mixture of Experts
2020
In order to estimate the channel gain (CG) between the locations of an arbitrary transceiver pair across a geographic area of interest, CG maps can be constructed from spatially distributed sensor measurements. Most approaches to build such spectrum maps are location-based, meaning that the input variable to the estimating function is a pair of spatial locations. The performance of such maps depends critically on the ability of the sensors to determine their positions, which may be drastically impaired if the positioning pilot signals are affected by multi-path channels. An alternative location-free approach was recently proposed for spectrum power maps, where the input variable to the maps…
Energy Efficiency Optimization for Multi-cell Massive MIMO : Centralized and Distributed Power Allocation Algorithms
2021
This paper investigates the energy efficiency (EE) optimization in downlink multi-cell massive multiple-input multiple-output (MIMO). In our research, the statistical channel state information (CSI) is exploited to reduce the signaling overhead. To maximize the minimum EE among the neighbouring cells, we design the transmit covariance matrices for each base station (BS). Specifically, optimization schemes for this max-min EE problem are developed, in the centralized and distributed ways, respectively. To obtain the transmit covariance matrices, we first find out the closed-form optimal transmit eigenmatrices for the BS in each cell, and convert the original transmit covariance matrices desi…
Data-Driven Spectrum Cartography via Deep Completion Autoencoders
2019
Spectrum maps, which provide RF spectrum metrics such as power spectral density for every location in a geographic area, find numerous applications in wireless communications such as interference control, spectrum management, resource allocation, and network planning to name a few. Spectrum cartography techniques construct these maps from a collection of measurements collected by spatially distributed sensors. Due to the nature of the propagation of electromagnetic waves, spectrum maps are complicated functions of the spatial coordinates. For this reason, model-free approaches have been preferred. However, all existing schemes rely on some interpolation algorithm unable to learn from data. …