Virtualization and digitalization affect such aspects of human personality as self-identification, self-actualization, and self-presentation. They also change the mechanisms of categorization and ...interpretation of individual experience while transforming the system of personal meanings. However, the degree and scope of the impact of virtual space on human personality needs further research. This research tested a new method for assessing the virtualization of Internet user personality. The author reviewed domestic and foreign publications to describe virtual space as a unique environment for life and interaction. The new diagnostic psychometric method proved reliable and valid. It demonstrated the level of personality virtualization as a number of cognitive characteristics. Three virtualization indicators served to define the direction of personality virtualization: immersion, involvement, and inclusion.
Due to COVID-19 restrictions, the Orthodox Church was compelled to move its worship to online platforms. What does such a shift mean in terms of liturgical theology and ontology? To what extent, and ...in what sense, is participation possible online? How does the virtual space function as a liturgical space? What kind of ontological and aesthetic problems are involved? Orthodox theologians have not yet developed answers to such questions. This paper approaches the problem in the light of Pseudo-Dionysian ontology, supplemented by Alexander Schmemann’s ideas, proposing that virtual worship offers a new sub-category of liturgical reality that reflects the higher forms of reality. To paraphrase the words of Pseudo-Dionysius, cyberspace constitutes a medium in which “like represents like,” though it uses formations that are “even entirely inadequate and ridiculous.”
Dc-link capacitor voltage unbalance would affect the performance of the neutral-point clamped (NPC) three-level inverter. With the traditional virtual space vector modulation (VSVPWM) method, the ...dc-link capacitor voltage could be kept balance under the different modulation indexes or power factors. With the virtual medium vector being set as an adjustable one, the voltage balance could be better guaranteed no matter there might have some non-linear factors However, whether the traditional or improved VSVPWM method has a complicated trigonometric calculation, thus, a newly MPC-based virtual vector modulation has been proposed in this paper. With the 19 virtual space vectors being in roll optimisation, a nice current trajectory, dc-link capacitor voltage balance, even a relative low switch losses have been implemented. Considering that the optimised virtual space vector could not be taken as a direct output, the distribution of the basic vectors has been generated to make it being favourable for modulation. The effectiveness of this MPC-based virtual vector modulation is verified in comparisons with other methods, which can save over 67.3% execution time of the traditional SVPWM method, and over 46.6% of the improved VSVPWM way while provide a better dc-link capacitor voltage balance and output current quality.
Virtual space vector pulsewidth modulation (VSVPWM) provides a new approach to neutral point voltage (NPV) control and common mode voltage (CMV) suppression. Few values of coefficients configured in ...the virtual vectors cannot adjust the NPV continuously. An improved VSVPWM (IVSVPWM) with active neutral point voltage control (ANPVC) and CMV suppression is proposed in this article. Continuously variable coefficients configured in the virtual vectors adjust the NPV actively and continuously for any load power factor over the full modulation indexes. Failure of CMV suppression is analyzed, and the undesired vectors with high CMV are avoided by limiting the range of the variable coefficients. The limited variable coefficients and the selected basic vectors with low CMV suppress the CMV effectively. Simulation and experimental results are given to validate the proposed novel IVSVPWM, which can achieve quicker ANPVC and reduce CMV to half of the conventional VSVPWM simultaneously.
Metaverse is an immersive, semi-virtual, semi-real, three-dimensional, shared, cross-border and inevitable world, extending our real world in a surprising and perhaps frightening way. Metaverse will ...likely make it possible for individuals to respond to a wide range of social, economic, educational, emotional, psychological, physical, and sexual needs through avatars and cryptocurrencies or other new technologies without revealing their true identity. Due to the lack of previous experiences, different norms and unique characteristics of the Metaverse, managing the Metaverse is much more challenging than the current real and virtual worlds. Developed governments of the world have well realized the potential hidden in the Metaverse, from the smallest family issues to the selection of leaders and the countries' governance. With foresight, they seek to guarantee their citizens' security and rights and their sovereign power in the metaverse space. Without a doubt, preemptive policy and premeditated criminalization in the Metaverse are vital. While explaining what the Metaverse is, this research has tried to identify some of the specific governance and legal challenges of the Metaverse and finally concluded that today we need a new definition of persons called "Virtual Persons" in order to respond to some of the emerging challenges of the Metaverse world.
This article proposes a virtual space vector (VSV) model predictive control (MPC) for a three-phase seven-level (7L) hybrid multilevel converter (HMC), where each phase consists of an ...active-neutral-point-clamped converter with a floating H-bridge. To achieve the best current tracking, which is the primary goal of the proposed algorithm, a novel geometrical positioning approach is proposed to select the optimal voltage vector among all the real-space vectors and VSVs. Then, all the possible switching sequences that belong to the optimal voltage vector are evaluated to realize the dc capacitor voltage balancing and common-mode voltage reduction. Through an external modulator, the optimal voltage vector can be synthesized by using either one-, three-, or seven-segment switching sequence. Compared with the conventional MPC, the proposed VSV-MPC can reduce not only the computational burden but also the current THD. Both simulation and experimental results obtained on silicon carbide based 7L-HMC prototype are presented to validate the feasibility and effectiveness of the proposed VSV-MPC strategy.
Neutral-point (NP) voltage imbalance is an inherent problem of three-level neutral-point clamped (NPC) converter. To solve this problem, an improved virtual space vector pulse width modulation ...(VSVPWM) is proposed in this paper. A new repartitioning of the space vector sectors is proposed for three-level NPC converter by considering the amplitude variations of small vectors under NP voltage imbalance. The factor k of the NP voltage imbalance is introduced. The small vector favorable to the NP voltage balance is selected based on the factor k and phase current direction to achieve precise control and balancing of NP voltage. The proposed method can effectively maintain NP voltage balance and eliminate the low frequency oscillation of the NP voltage over the whole modulation index range. The improved VSVPWM also has advantages of good dynamic performance. The method has been tested and verified by simulations and experiments.
A three-level T-type inverter has higher efficiency and lower output voltage harmonics compared with the traditional two-level inverter. However, neutral-point voltage fluctuation and common-mode ...voltage (CMV) can negatively affect the performance of the three-level T-type inverter. This study proposes a novel hybrid variable virtual space vector (HV2SV) strategy to mitigate this problem. Based on the virtual space vector scheme, new variable virtual small and medium vectors are reconstructed with the principle that the change of neutral-point charge of each virtual vector in a switching period is zero, and the adjustment factor is further added to the virtual vector to achieve the balance of the neutral-point voltage. At the same time, the vectors with a large CMV are eliminated to ensure that the CMV is minimised. Therefore, the HV2SV has excellent neutral-point voltage balance control capability and common-voltage suppression at both high- and low-modulation ratios. Theoretical analysis, simulations, and experimental results demonstrate the effectiveness and feasibility of the proposed strategy for full modulation ratios.
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