Signal Amplification Assisted by Multiple Sideband Interference in 1D Waveguide QED Systems

This study theoretically investigates signal amplification resulting from multiple Rabi sideband coherence in a one-dimensional waveguide quantum electrodynamical system. Specifically, we explore the behavior of a transmon while strongly driven by a coherent microwave field through a semi-infinite waveguide. To understand the underlying mechanisms of amplification, we develop a theory that explicitly takes into account multiple dressed sidebands under a strong driving field, and analyze the reflection amplitude of the probe signal. Our findings show that amplification can be related to either population inversion or multiple sideband constructive interference in some cases without population inversion. We further examine the effect of qubit dephasing during the amplification process

Why people adopt VR English language learning systems: An extended perspective of task-technology fit

Virtual Reality (VR) techniques involving immersion, interaction, and imagination, not only can improve conventional teaching methods, but also can enhance the transmission of education training contents through the interaction and simulation characteristics of VR. Incorporating information technology (IT) with English teaching has become an important issue in the academic field. Emerging after computer-assisted teaching, interactive network learning, distance education, and mobile learning in the early days, virtual reality techniques have been regarded as a new trend of merging technology with education. To explore the factors affecting users’ adoption intention of VR English language learning systems (VRELLS), this study has sought to build a theoretical framework based on the task-technology fit theory (extrinsic motivation) combining users’ needs (internal and external needs) and satisfaction to put forward an integrated research model (perceived needs-technology fit model), which explicates people’s adoption behaviors of VRELLS. An online questionnaire was employed to collect empirical data. A total of 291 samples were analyzed using a structural equation modeling (SEM) approach. The results of the study showed that both perceived needs-technology fit and satisfaction play a significant role in the user’ adoption intention of VRELLS services. In addition, the utilitarian and hedonic needs have a positive impact on the user’s perceived needs-technology fit. Also, it was found that relative advantage, service compatibility and complexity are important factors in influencing individuals’ perceived needs-technology fit. The implications of these findings are discussed along with suggestions for future research

An SoC-Based System for Real-time Contactless Measurement of Human Vital Signs and Soft Biometrics

Computer vision (CV) plays big role in our current society's life style. The advancement of CV technology brings the capability to sense human vital sign and soft biometric parameters in contactless way. In this work, we design and implement the contactless human vital sign parameters measurement including pulse rate (PR) and respiration rate (RR) and also for assessment of human soft biometric parameters i.e. age, gender, skin color type, and body height. Our designed system is based on system on chip (SoC) device which run both FPGA and hard processor while provides real-time operation and small form factor. Experimental results shows our device performance has mean absolute error (MAE) 2.85 and 1.46 bpm for PR and RR respectively compared to clinical apparatus. While, for soft biometric parameters measurement we got unsatisfied results on age and gender estimation with accuracy of 58% and 74% respectively. However, for skin color type and body height measurement we reach high accuracy with 98 % and 2.28 cm respectively on both parameters

Heat Transfer Enhancement by Using Fin for MH Hydrogen Storage Tank - Discuss on the Geometrical Optimization of Fin -

The expectation for renewable energy is rising from the viewpoints of recent environmental problems and energy problems. The reason why renewable energy is not widespread is that there are temporal and spatial restrictions on real application. There is an increasing interest in hydrogen energy as energy that compensates for such weaknesses of renewable energy.　Hydrogen can easily converted to be thermal energy, mechanical energy, electric energy and used. It is important to establish effective saving techniques for effective development of hydrogen energy systems. Three methods of liquification, pressurization and metal hydride (on briefly, referred to as MH) are the major hydrogen energy storage methods. In this study, we focus on the hydrogen storage by using the metal hydride. MH can storage hydrogen with high density, and it can be used at low temperature and low pressure, but has the disadvantage that the release rate of hydrogen due to the low effective thermal conductivity of the MH alloy layer. In this study, the heat transfer enhancement effects of several fins on metal hydride particle layer are estimated by experiment and simulation. The unsteady state heat conduction calculation of MH alloy layer with and without fins was conducted with the Solidworks simulation soft and, the experimental and the calculation parameters are charging volume ratio of fins, and the shapes of fin like as cross fin and circular cross fin. Another estimation parameter is the diameter of storage tank. One storage tankhas an outer diameter of 80 mm, an inner diameter of 78 mm, the other has an outer diameter of 25 mm and an inner diameter of 23.5 mm. The number of fins was increased until the charging volume ratio of the fin, 25 volume %, we estimated the heat transfer enhancement influence of the fins on the MH ally layer. According to our calculation results, the effective thermal conductivity is increased with increasing of charging volume ratio of fin, but this heat transfer enhancing effect is saturated at over 10 volume % of it. In oursimulation model of a circle cross fin, the tank which have an outer diameter of 52 mm and an inner diameter of 50 mmwas used. In the simulation results of using circle cross fins cases, the highest heat transfer enhancement effect was obtained when circular diameter of circular cross fin was 24 mm. Compared with cross fins (which has a heat transfer enhancing effect of 4.68 times compared with without fins), the volume content of circular cross fin was 1.4% higher than that of cross fin. However, the heat transfer enhancement effect of circular cross fin was 2.46 times higher than that of cross fin. And, it is confirmed that circle cross fin which have charging volume ratio, under 10% can achieve a high heat transfer enhancing effect and is suitable to heat transfer enhancing of MH particle layer

What Drives Continued Intention for Mobile Payment? - An Expectation Cost Benefit Theory with Habit

The number of smartphone users has increased rapidly in recent years as the mobile networking becomes more mature, which not only gives rise to a new lifestyle but also facilitates the development of mobile application services. Smartphones thus become an indispensable device of people’s daily contact. Today people from all walks of life set their attention on mobile payments amongst smartphone mobile application services. To explore the factors affecting users’ continued use of mobile payments, this study has sought to build a theoretical framework based on the cost-benefit theory and add habit as a factor to put forward an integrated research model, which explicates people’s continued use of mobile payment services. An online questionnaire was employed to collect empirical data. A total of 295 samples were analyzed using structural equation modeling (SEM) approach. The results showed that both perceived value and habit played an important role in users’ continued intention to use mobile payment services. Also, the perceived benefits (mobile convenience and service compatibility) and perceived costs (security risk and perceived fee) are crucial factors that determine users’ perceived value. In addition, the study also found that perceived value had a positive impact on users’ habit, showing that in the context of a mobile-oriented information system, whether mobile payment services satisfied users’ perceived value influenced the formation of habit of using such services. The implications of these findings are discussed

Promoting Customers’ Augmented Reality Immersion in Restaurants

With the rapid growth of augmented reality (AR) applications, AR is set to influence companies and organizations in every industry. This study focuses on identifying how AR technology enhances memorable experiences through the lens of customer immersion. An AR 3D food ordering platform that included an AR food ordering app for customers and a restaurant management system for restaurants was implemented as part of the study, and the concept of AR immersion was further introduced. The investigation involved an empirical examination of the effects of perceived playfulness and personal innovativeness on three dimensions of AR immersion: engagement, engrossment, and total immersion. The results of an analysis of data collected from 343 restaurant customers who experienced using the AR food ordering app indicated that engagement and engrossment had direct effects on customer satisfaction, but total immersion did not. Perceived playfulness directly affected engagement, engrossment, and total immersion and indirectly affected customer satisfaction through its direct effects on engagement and engrossment. Similarly, personal innovativeness influenced customer satisfaction indirectly through its direct effects on engagement. In terms of the effects of AR immersion, engrossment should be the target, engagement is insufficient, and total immersion is unnecessary. A practical implication of our findings is that it is possible to increase customer satisfaction directly by increasing the levels of engagement and engrossment with an AR food ordering app