reliable performance
Recently Published Documents


TOTAL DOCUMENTS

396
(FIVE YEARS 134)

H-INDEX

20
(FIVE YEARS 4)

2022 ◽  
Author(s):  
Jino Heo ◽  
Seong Gon Choi

Abstract We propose photonic schemes for the distribution and reconstruction of a two-qubit entangled state using a hybrid entangled state under a noisy quantum channel. First, to generate a hybrid entangled state correlated with polarizations and time-bins, we employ a quantum dot (QD)-cavity system (nonlinear optical gate) and linear optical devices to implement controlled operation. These schemes can achieve the distribution and reconstruction of a two-qubit entangled state from hybrid entanglement by utilizing only linear optical devices without a QD-cavity system (i.e., a nonlinear optical device) for users who want to share an entangled state under a noisy quantum channel. For a feasible realization of the proposed schemes, we analyze the interaction between the photons and QD-cavity system and demonstrate the experimental conditions under which the reliable performance of the QD-cavity system is achieved.


2022 ◽  
Vol 12 ◽  
Author(s):  
Christian Böffel ◽  
Sophie Würger ◽  
Jochen Müsseler ◽  
Sabine J. Schlittmeier

Free games that are monetized by selling virtual items, such as cosmetic microtransactions for one’s avatar, seem to offer a better gaming experience to paying players. To experimentally explore this phenomenon, the effects of character customization with cosmetic microtransactions on objective and self-estimated player performance, subjective identification with the avatar, fun and the players’ perceived competence were examined in the game League of Legends. This study introduces a new laboratory-based, experimental task to objectively measure within-game player performance. Each participant performed this game-based task in two different conditions: With a character that was customized using a provided set of cosmetic microtransactions and with a default character. Results showed that customization increased subjective identification with the player character. However, objective performance measures were unaffected by this manipulation although the novel experimental approach provided reliable performance results. Additionally, identification was positively related to perceived competence, fun, and self-estimated performance. Implications for the design of cosmetic microtransactions and their influence on competitive gaming are discussed.


2022 ◽  
Vol 151 ◽  
pp. 106641
Author(s):  
Krishna Siva Teja Chopperla ◽  
Thano Drimalas ◽  
Mengesha Beyene ◽  
Jussara Tanesi ◽  
Kevin Folliard ◽  
...  

2021 ◽  
Vol 12 (4) ◽  
pp. 83-104
Author(s):  
Wojciech FURMANEK ◽  
Jacek KIJEWSKI

This paper provides a characteristic of the design of 120 × 570 mm tank ammunition with particular reference to the cartridges in service in the Polish Army. The presentation of the design and technological details was primarily focused on emphasising their influence on the phenomena occurring or likely to occur during the process of ammunition operation, and to a much lesser extent related with the reference of the characteristics of the performance of the ammunition. Due to the sheer bulk of this subject matter, this paper narrowed the issues of ammunition primarily to the aspects of entry into service, transport, storage, and operation of the specified ammunition cartridges. During these operational stages, there was major focus on the issues of ammunition safety and reliable performance. Note that these aspects are not exhaustive for the topic; this paper also serves as an introduction to a future paper which will deal with safety issues during combat operation using the 120 × 570 mm tank ammunition cartridges.


2021 ◽  
Author(s):  
Santiago de J. Favela Ortíz ◽  
Edgar A. Martínez-García

This work discloses a kinematic control model to describe the geometry of motion of a two-wheeled biped’s limbs. Limb structure is based on a four-bar linkage useful to alleviate damping motion during self-balance. The robot self-balancing kinematics geometry combines with user-customized polynomial vector fields. The vector fields generate safe reference trajectories. Further, the robot is forced to track the reference path by a model-based time-variant recursive controller. The proposed formulation showed effectiveness and reliable performance through numerical simulations.


Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 35
Author(s):  
Haider Ali ◽  
Xin-Cheng Ren ◽  
Inam Bari ◽  
Muhammad Adil Bashir ◽  
Anas M. Hashmi ◽  
...  

In this article, a compact four-port MIMO antenna system resonating from 4.7–5.1 GHz on −6 dB criteria is discussed. The proposed antennas are arranged in a perpendicular manner providing diversity with good isolation characteristics. The proposed antenna was fabricated and designed on a commercially available low-cost FR-4 substrate with a relative permittivity of 4.4. The total size of the antenna is 40 × 40 mm2, and a minimum isolation of 25 dB was observed at most nearby resonating elements. The proposed antenna was fabricated and tested at an in-house facility, and the measured results agree well with the simulations. The MIMO antenna characteristics, such as the envelope correlation coefficient (ECC) among any two radiating elements, have been found to be less than 0.1, and the diversity gain (DG) value evaluated showed that the proposed antenna is well designed. Furthermore, the SAR analysis showed that the desired antenna system is safe for users, with a value of 0.94 W/Kg. The channel capacity (cc) was found to be 18.7 bps/Hz, approximately 2.7 times more than SISO systems. Through its robust and reliable performance and its peak gain of 2.8 dBi, the proposed compact antenna is a good candidate for future 5G devices.


2021 ◽  
Vol 11 (24) ◽  
pp. 11796
Author(s):  
Jiayi Fan ◽  
Janghyeon Lee ◽  
Insu Jung ◽  
Yongkeun Lee

Power semiconductor devices in the power converters used for motor drives are susceptible to wear-out and failure, especially when operated in harsh environments. Therefore, detection of degradation of power devices is crucial for ensuring the reliable performance of power converters. In this paper, a deep learning approach for online classification of the health states of the snubber resistors in the Insulated Gate Bipolar Transistors (IGBTs) in a three-phase Brushless DC (BLDC) motor drive is proposed. The method can locate one out of the six IGBTs experiencing a snubber resistor degradation problem by measuring the voltage waveforms of the three shunt resistors using voltage sensors. The range of the degradation of the snubber resistors for successful classification is also investigated. The off-the-shelf deep Convolutional Neural Network (CNN) architecture ResNet50 is used for transfer learning to determine which snubber resistor has degraded. The dataset for evaluating the above classification scheme of IGBT degradation is obtained by measuring the shunt voltage waveforms with varying snubber resistance and reference current. Then, the three-phase voltage waveforms are converted into greyscale images and RGB spectrogram images, which are later fed into the deep CNN. Experiments are carried out on the greyscale image dataset and the spectrogram image dataset using four-fold cross-validation. The results show that the proposed scheme can classify seven classes (one class for normal condition and six classes for abnormal condition in one of the six IGBTs in a three-phase BLDC drive) with over 95% average accuracy within a specific range of snubber resistance. Using grayscale images and using spectrogram-based RGB images yields similar accuracy.


2021 ◽  
Author(s):  
◽  
Nadia Moazen

In this thesis, I focus on exploiting electroencephalography (EEG) signals for early seizure diagnosis in patients. This process is based on a powerful deep learning algorithm for times series data called Long Short-Term Memory (LSTM) network. Since manual and visual inspection (detection) of epileptic seizure through the electroencephalography (EEG) signal by expert neurologists is time-consuming, work-intensive and error-prone and it might take a couple hours for experts to analyze a single patient record and to do recognition when immediate action is needed to be taken. This thesis proposes a reliable automatic seizure/non-seizure classification method that could facilitate the identification process of characteristic epileptic patterns, such as pre-ictal spikes, seizures and determination of seizure frequency, seizure type, etc. In order to recognize epileptic seizure accurately, the proposed model exploits the temporal dependencies in the EEG data. Experiments on clinical data present that this method achieves a high seizure prediction accuracy and maintains reliable performance. This thesis also finds the most efficient lengths of EEG recording for highest accuracies of different classification in the automated seizure detection realm. It could help non-experts to predict the seizure more comprehensively and bring awareness to patients and caregivers of upcoming seizures, enhancing the daily lives of patients against unpredictable occurrence of seizures.


2021 ◽  
Vol 22 (12) ◽  
pp. 644-649
Author(s):  
F. M. Belchenko ◽  
I. L. Ermolov

Remotely controlled robots are the majority of contemporary robots’ population. As a rule such robots are used for inspection, patrolling, mines disposal. This is caused by a fact that today’s level of robots’ autonomy is rather low and autonomous robots can not secure reliable performance. However performance of remotely operated robots depends largely on efficiency of information perception by human-operator. This paper studies images representation to operators on robots’ control pendants. More specifically it studies 3D images representation on flat displays. The goal of this study is to increased reaction rate and decrease errors done by robot’s operator due to image’s uncertainty or poor quality. Our main attention is paid to the development of software that implements the technology of transforming the perspective of images. Matrixes for perspective transformation are studied. Hence application of these matrixes within remotely operated robots is discussed. A novelty of this research is in new knowledge about perspective transformation which is done for a better information perception by human-operator and, as an outcome, to increase efficiency of remotely operated robots. The related technologies in the field of telemetry and technical vision systems have been investigated. Also considered are works in medical fields, in particular, the psychology of perception of images and space. A static software model has been developed. The video camera has been implemented with the introduction of perspective distortions to improve the reliability of the transmission of the necessary areas in the image. Research on the technology is carried out jointly with the Institute of Biomedical Problems of the Russian Academy of Sciences. A special prototype for perspective transformation basing on various scenarios is being developed.


2021 ◽  
pp. 91-116
Author(s):  
Anne Russel ◽  
Stéphanie Tillement ◽  
Benoit Journé

AbstractThis chapter discusses the organizational and occupational dimensions of resilience in temporary organizing contexts and how these contribute to sustained reliable performance. When dealing with issues related to high levels of safety in complex settings, longstanding organizations with strong organizational routines are often described as the most appropriate forms of organizing. However, temporary forms of organizing are developing and little is known on how actors engaged in such contexts can enhance and sustain resilience when facing uncertainty in safety-critical contexts. This chapter addresses this gap in the literature by demonstrating that temporary organizations, such as project-based ones, can also deal with major safety issues, and that temporary forms of organizing can help complex projects to be efficiently and safely carried out. We examine this proposition by studying the case of an inter-organizational and safety-critical project: the construction by a shipyard of a series of ships. Looking at the meso-level, i.e. the occupational groups involved in the project, we show how temporary forms of organizing and occupational groups together contribute to the resilience of the whole project. We highlight that the ability of the project to coordinate temporary organizing forms is key in achieving (safe) performance.


Sign in / Sign up

Export Citation Format

Share Document