263,053 research outputs found
Körper-Seele-Geist-Welt-Verhältnisse in der Integrativen Therapie – Der „Informierte Leib“, das „psychophysische Problem“ und die Praxis
No full textDer Beitrag stellt in kompakter Form eine therapierelevante Position zum psychophysischen Problem aus Sicht Integrativer Therapie da. Er vertritt einen „differentiellen, emergenten materialistischen Monismus“ mit der Differenzierung: materiell, materiell-transmateriell organismisch (biologisches Leben), emergent materiell-transmateriell (geistige, Bewusstseinsphänomen, indes auf materieller Basis, also monistisch). Sie bildet in der Idee des „Informierten Leibes“ als das verkörperte (embodied) und in die Lebenswelt eingebettete „Leibsubjekt“ (embedded) eine Synergie. Transmaterielle Phänomene (z. B. Phantomschmerz) oder im fMRI sichtbar gemachte gedankliche Aktivität gekoppelt an Stoffwechselprozesse stützen die Emergenzannahme und erschließen Interventionsmöglichkeiten wie die Kombination von sporttherapeutischer Übung (bottom up) und mentalem Training (top down). An Hand eines Beispiels aus einer BPS-Behandlung wird das Konzept für die klinische Praxis dargestellt.This article presents in condensed form a position of the “body mind problem” from the viewpoint of Integrative Therapy. It advocates a „differential, emergent materialistic monism“ with the differentiation: material, material-transmaterial organismic (biological life), emergent material-transmaterial qualities (e.g. mental, conscious phenomena, however based in matter, i. e. monistic). These qualities converge in the idea of the “Informed Body” which is the “subject embodied”, embedded in the life word (Lebenswelt) forming a synergy. Transmaterial phenomena as phantom pain or mental activities coupled with metabolic processes as documented by fMRI are supporting the hypothesis of emergence. They open up ways of interventions as the combination of excercises from sport therapy (bottom up) and mental training (top down). Using material from a BPD treatment this concept is expounded for clinical practice.https://www.fpi-publikation.de/polyloge/13-2011-petric-matko-informirano-tijelo-embodied-and-embedded-utjelovljeno-i-ugradeno/peerReviewedpublishedVersio
Virtual reality in the service of user participation in architecture
No full textThe issue of user participation in the processes of building and urban design is enjoying renewed attention following its relative neglect over the last 20 years due, in large measure, to significant advances in emerging information technologies, particularly multimedia, virtual reality and internet technologies. This paper re-established the theoretical framework for participatory design evolved in the late sixties and early seventies as part of the movement towards a more explicit design methodology and attempts an explanation of why the concept failed to gain commitment from the architectural and urban design professionals. The paper then gives an account of two significant developments in the evolution of the application of information technologies with which the authors have been engaged. These are: i. a responsive and interactive interface to wholly immersive and realistic virtual reality representations of proposed buildings and urban neighbourhoods. ii. an intuitive and platform-independent VR modelling environment allowing collaborative evolution of the scheme from within the virtual world. The impact of these IT developments is demonstrated in the context of the design of a leisure facility for a community of users with physical impairment
Investigation of Nonlinearities Introduced by Multi-sampled Pulsewidth Modulators
No full textMulti-sampled pulsewidth modulator (MS-PWM) digital control is important for reduction of control and modulator delays as well as for noise suppression. To reduce aliasing and modulator nonlinearities, the MS-PWM is often implemented with switching ripple filtering, which limits the obtained dynamic improvements. This article analyzes the multi-sampled modulator nonlinearities in order to provide means for the optimal implementation of MS-PWM without ripple filtering. Depending on the types of intersections between the modulating waveform and the carrier, the nonlinearities are manifested as reduced-gain, zero-gain, and infinite-gain zones in the modulator transcharacteristic. For dc-type converters, the modulator nonlinearities can impair the transient response and give rise to limit cycle oscillations. For ac-type converters, it is shown that the modulator nonlinearities result in a stronger harmonic distortion compared to the aliasing effect. The nonlinear behavior is caused by the modulating waveform steps, whose pattern depends on switching ripple, controller gains, multi-sampling factor, and time delay of the control system. Particularly, the time delay is found to be a crucial factor that determines which nonlinearity is exhibited and to what extent. Discontinuity and nonlinearity graphs are proposed and exploited to adjust the time delay, so as to avoid specific nonlinearity zones and to, partially or completely, linearize the system behavior. The theory is experimentally verified on a dc-dc buck converter and a dc-ac single-phase inverter. This article is accompanied by videos of experimental validations
A Jitter Amplification Phenomenon in Multisampled Digital Control of Power Converters
No full textThis paper investigates a nonlinear phenomenon related to multisampling control of power converters. The nonlinearity, manifested as increased gain regions in static modulator transcharacteristic, is caused by the discontinuity of the modulating waveform, and can result in increased jittering of the duty-cycle. The paper proposes a statistical model for predicting the jittering impact on the duty cycle variance, analytic derivations for the jittering conditions, and an anti-jittering algorithm. A numerically obtained static modulator transcharacteristic is given to illustrate the increased gain regions. Verifications, performed on a multisampled digitally controlled buck converter, show a good match between the theoretical analysis, simulations and experimental results. This paper is accompanied by videos demonstrating the jitter amplification and the algorithm operation
Feedback Noise Propagation in Multisampled DC-DC Power Electronic Converters
No full textThis article analyzes the propagation of feedback noise in multisampled dc-dc power converters. The analytical calculations for noise attenuation, strictly valid for linear time-invariant systems, are found to offer good predictions for power converters, after suppressing the decimation effects of the digital pulsewidth modulator (DPWM). For control systems that employ a proportional-integral controller, without any digital low-pass filters, the nonlinearity caused by the DPWM decimation is found to saturate the noise attenuation properties, as the multisampling factor N is increased. Strong noise attenuation is enabled using antialiasing digital filters, with a small impact on the dynamic response. For control systems that employ a proportional-integral-derivative controller, increase of the multisampling factor, without any digital filters, causes the amplification of the noise power. Therefore, a greater attenuation of high-frequency components is required to provide a significant noise reduction in the control bandwidth. Even with these antialiasing digital filters, the dynamic response of multisampled control systems is improved compared to double-update. This is proven by the analytical and experimental comparison of various multisampled control strategies in terms of dynamic response and noise attenuation capabilities. The experimental results, from a buck-type converter, match well with simulations and analytical calculations
Analysis of websites micro breweries in Slovenia
No full textV današnjem času hitrega napredka in sprememb mora podjetje slediti spremembam v poslovanju, trendom in vedno večjim zahtevam obiskovalcev spletnih strani. Val sprememb je prenesel svoj vpliv tudi na način življenja in poslovanja, kjer se kaže potreba po vedno večji informatizaciji poslovanja. Kakovostna in atraktivna spletna stran je v današnjem času izjemnega pomena, saj se podjetje na ta način najlažje predstavi, pritegne potencialnega kupca in daje podjetju veliko poslovnih priložnosti.
V teoretičnem delu diplomskega projekta sem predstavil definicijo elektronskega poslovanja in najpomembnejše korake do vzpostavitve uspešnega elektronskega poslovanja. Predstavil sem vrste in značilnosti spletnih strani, opisal sem korake do uspešnega elektronskega poslovanja, predstavil prednosti in slabosti spletnih strani ter opredelil kaj moramo storiti, da zagotovimo varnost spletne strani.
V praktičnem delu diplomskega projekta sem uporabil pridobljena znanja za analiziranje spletnih strani mikropivovarn v Sloveniji. Pri izbiri sem se omejil le na Slovenske mikropivovarne. Analize sem podal glede na kriterije za ovrednotenje spletnih strani. Opazil sem, da so Slovenske mikropivovarne zadovoljivo ozaveščene o ustreznosti spletne strani, vendar pa je še vedno pri večini veliko prostora za napredek.
Spletne strani so namenjene hitremu, razumljivemu in preprostemu prikazu informacij. Ljudje hitro zapustijo spletno stran, v kolikor niso dobili željene informacije. Prav iz tega razloga mora biti spletna stran informativna, zanimiva, preprosta za brskanje in hitra za nalaganje elementov oziroma strani.
Za kakovost in uspešnost spletne strani je potrebno prisluhniti željam ter potrebam obisovalcev spletne strani, saj bodo v prihodnosti prav ti obiskovalci edini pravi vir, iz katerega bodo podjetniki črpali informacije in izboljševali svoje poslovanje.In today\u27s time of rapid progress and change, the company must follow the change in the business, the trends and growing requirements of the website visitors. The wave of change has been its influence also on the way of life and business, which shows the need for increasing computerising of the business. High-quality and attractive website in today\u27s of the utmost importance, since the company in this way is the easiest way to present, attracting a potential buyer and gives the company a lot of business opportunities.
In the theoretical part of the graduate project I introduced a definition of electronic commerce and the most important steps to creating a successful e-commerce. I have introduced the types and characteristics of the web page, I described the steps to successful e-business, presented the advantages and disadvantages of websites and identified what we need to do to ensure the security of the website.
In the practical part of graduate project, I used the acquired knowledge to analyze the websites of micro breweries in Slovenia. I choosed to restrict only on the Slovenian micro breweries. The analysis I made were based on the criteria for evaluation of websites. I\u27ve noticed that Slovenian micro breweries sufficiently informed about the relevance of the web page, however, is still for most a lot of room for improvement.
Websites are intended to provide a quick, understanding and simple way to view informations. People quickly leave a website if they do not get directly the information. Because of this reason the website must be informative, interesting, simple to browse and fast to load.
For the quality and performance of the website is necessary to listen to the wishes and needs of the website users, as they will be in the future the only real source, from which will entrepreneurs drew information and improve their business
Noise Attenuation Properties of Multisampled Control in Power Electronics
No full textThis paper analyzes the capabilities of multisampled control to reduce the impact of feedback noise propagation. The analytical calculations for random measurement noise show good match with simulations, after suppressing the effect of the digital pulse-width modulator decimation. Experimental verification on a boost converter shows certain attenuation of noise when the multisampling factor is increased
Karstology and development challenges on karst. I -Water, par M. Knez, M. Petric et T. Slabe (Eds), 2011
No full textHobléa Fabien. Karstology and development challenges on karst. I -Water, par M. Knez, M. Petric et T. Slabe (Eds), 2011. In: Karstologia : revue de karstologie et de spéléologie physique, n°58, 2e semestre 2011. Fantômisation des calcaires lutétiens (Bassin de Paris) pp. 60-61
Accurate High-Frequency Modeling of the Input Admittance of PWM Grid-Connected VSCs
No full textThis article addresses high-frequency admittance modeling of current-controlled voltage source converters (VSCs). Recent studies have shown that harmonic instability may also occur at frequencies above the Nyquist frequency. To form an accurate multiple-frequency model in this frequency range, sidebands that originate from modulation and sampling must be examined. In this article, an accurate small-signal model is developed taking into account an adequate digital pulsewidth modulator (DPWM) representation, which allows to predict dependence of the frequency response on the steady-state dc (SS-dc) operating point. It is shown that when center-pulse sampling is implemented, pulsewidth modulation sidebands do not create additional loops leaving only sampling sidebands to be considered. Using the same approach as for SS-dc operation, a model that accurately represents admittance measurements during sinusoidal ac (S-ac) operation is developed. Its basis is a novel DPWM model suitable for S-ac regime, which allows to predict dependence of the VSC’s input admittance on the grid voltage magnitude. Experimental and simulated admittance measurements, performed on a single-phase two-level VSC during various SS-dc and S-ac regimes, match with the proposed models up to twice the sampling frequency
Small-Signal Modeling of Phase-Shifted Digital PWM in Interleaved and Multilevel Converters
No full textIn this article, small-signal modeling of digital pulsewidth modulators (DPWMs) used in multicell voltage source converters (VSCs) is addressed. In addition to sampling and computation, DPWM introduces delay, which impairs VSC's dynamic performance and robustness. In order to take into account the influence of modulation delay, an accurate small-signal representation of DPWM is necessary. Here, modeling of multisampled bipolar and unipolar phase-shifted DPWMs for single-, double-, and multi-update strategies is presented. The simplest multilevel modulation of single-cell full-bridge VSCs, unipolar DPWM, is also covered by the analysis. The derived operating-point-dependent small-signal DPWM models are verified using simulated and experimental frequency response measurements up to four times the Nyquist frequency. Comparisons are also made with the models conventionally considered in the literature. Additionally, an approximate method is presented to model the influence of dead time on DPWM's small-signal dynamics. For the purposes of showcasing the importance of the proposed DPWM models, high-frequency admittance of a VSC employing multisampled multiupdate unipolar DPWM is modeled and verified in simulations and experiments
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