Hasil untuk "Cellular telephone services industry. Wireless telephone industry"

M. Iqbal, Parwoto ., Rhian Indradewa

The Indonesian telecommunications industry has been heavily affected by the rapid advances in telecommunications technology. Mobile telecommunications are an advancement in the field of communication technology. One of the cellular telephone service providers in Indonesia is PT Telkomsel. In Indonesia, Telkomsel, which launched its postpaid service on May 26, 1995, is the second GSM (Global System Mobile) cellular telephone provider. With 169.2 million users as of June 2021, PT. Telekomunikasi Indonesia (Persero) Tbk has increased its customer base by 5.7% from the same period last year. Telkomsel has a total of 162.48 million cellular subscribers. The remaining 6.72 million people are postpaid subscribers. The cellphone provider in Indonesia with the most customers as of June 2021 is PT. Cellular Telecommunications (Telkomsel). Customer satisfaction is very important for the survival of a company, so it is very important for companies to be able to leverage consumer preferences to offer consumer value, provide excellent customer service, and ultimately drive repeat business. In connection with the above, the authors need to conduct a study on customer satisfaction and decision making to buy Telkomsel prepaid card cellular users. This study aims to examine the phenomenon of making a decision to buy both in terms of customer satisfaction, customer value and service quality. It is hoped that Indonesia will be able to use the findings from this mobile research as a guide to further improve the functionality of Telkomsel's prepaid card. Research with a conclusive design, or a type of inference research that seeks to test certain hypotheses, is what is used. This can be descriptive, exploring a problem, or correlative, looking for relationships between variables between the independent and dependent variables. Customer value has a direct and significant effect on customer satisfaction. Customer value has a direct and not significant effect on purchasing decisions. Service quality has a direct and significant effect on customer satisfaction. Service quality has a direct and not significant effect on purchasing decisions. Customer satisfaction has a direct and significant effect on purchasing decisions. Customer value has an indirect and is not significant effect on purchasing decisions through customer satisfaction. Service quality has an indirect and significant effect on purchasing decisions through customer satisfaction. The practical implication is that Telkomsel prepaid cards must manage customer value as an important factor influencing customer satisfaction as well as service quality as the most important factor influencing purchasing decisions and managing customer satisfaction as the most important factor influencing purchasing decisions. Keywords: Customer Value, Service Quality, Customer Satisfaction, and Purchase Decision.

International Journal of Antennas and Propagation

S. Khan, Usman Naseem, Haris Siraj et al.

Next‐generation wireless communication networks, in particular, the densified 5G will bring many developments to the existing telecommunications industry. The key benefits will be the higher throughput and very low latency. In this context, the usage of unmanned aerial vehicle (UAV) is becoming a feasible option for deploying 5G services on demand. At the same time, the immense bandwidth potential of mmWave has strengthened its performance in radio communication. In this article, we provide a consolidated synthesis on the role of UAVs and mmWave in 5G, emphasis on recent developments and challenges. The review focuses on UAV relay architectures, identifies the relevant problems and limitations in the deployment of UAVs using mmWave in both access and backhaul links simultaneously. There is a critical analysis of the optimum placement of the UAVs as a relay with a focus on the mmWave band. The distinctive rich characteristics of the mmWave propagation and scattering are presented. We also synthesis mmWave path loss models. Then, the scope of artificial intelligence and machine learning techniques as an efficient solution for combating the dynamic and complex nature of UAV‐based cellular communication networks are discussed. In the end, security and privacy issues in UAV‐based cellular network are spotlighted. It is believed that the literature discussed, and the findings reached in this article are of significant importance to researchers, application engineers and decision‐makers in the designing and deployment of UAV‐supported 5G network.

Emil J. Khatib, R. Barco

Industry 4.0 is generalizing the use of wireless connectivity in manufacturing and logistics. Specifically, in Smart Logistics, novel Industry 4.0 technologies are used to enable agile supply chains, with reduced management, energy and storage costs. Cellular networks allow connectivity throughout all the scenarios where logistics processes take place, each having their own challenges. This paper explores such scenarios and challenges, and proposes 5G technology as a global unified connectivity solution. Moreover, this paper proposes a system for exploiting the application-specific optimization capabilities of 5G networks to better cater for the needs of Smart Logistics. An application traffic modeling process is proposed, along with a proactive approach to network optimization that can improve the Quality of Service and reduce connectivity costs.

Ali Nazaritehrani, B. Mashali

There is fierce global competition within the banking industry. Therefore, banks endeavor to grow and strive to increase their market share. We analyzed the effect of developing innovative channels of presenting bank services on banks’ market share. The statistical population of this research was Shahr bank’s central headquarter and its branches in Tehran, Iran. We developed questionnaires for gathering the data. The validity and reliability of the scales were tested by EFA, CFA, experts’ opinion, and Cronbach’s alpha. We used linear regression to assess the impact of innovative channels, including internet banking, automatic teller machines (ATMs), mobile banking, telephone banking (TB), and point of sales (POS) on banks’ market share. The results indicated that some of these channels, including internet banking, POS, and TB, positively affect a bank’s market share. The effect of two other platforms, including mobile banking and ATM development, on banks’ market share was rejected. The findings of this study expand our understanding of how bank managers can improve their market share by developing innovative e-banking channels.

C. Suraci, Vincenzo de Angelis, Giuseppina Lofaro et al.

Over the past two years, the spread of COVID-19 has spurred the use of information and communication technologies (ICT) in aid of healthcare. The need to guarantee continuity to care has promoted research and industry activities aimed at developing solutions for the digitalization of the procedures to be performed to provide health services, even in emergency scenarios. Digital collection, transmission, and processing of health data represent the starting point for fulfilling this innovation process but also bring heterogeneous challenges. These motivations led to the elaboration of this work, which analyzes innovative and technological tools for the development of digital health (eHealth) through the collection of multisectoral literature, produced thanks to the cooperation of varied research groups, thus providing a multidisciplinary survey. Since digital health is expected to be one of the leading applications of the sixth-generation (6G) wireless cellular networks, this paper covers the related telecommunications aspects. Furthermore, the exploitation of artificial intelligence paradigms to elaborate massive amounts of biological data is examined. Given the extreme sensitivity of health data, this paper also investigates security and privacy issues. In particular, the main techniques and approaches to guarantee security properties (i.e., anonymity, responsibility, authentication, confidentiality, integrity, non-repudiation, and revocability) are studied. Applications involving innovative electromagnetic systems for healthcare and assisted living services are described to provide an example of an eHealth scenario leveraging ICT. Finally, the telemedicine-related regulations of the European Commission are analyzed, with particular reference to the General Data Protection Regulation (GDPR).

Xinying Li, Haixia Wei, Haiyan Huang et al.

Nonorthogonal multiple access (NOMA) techniques and intelligent reflecting surface (IRS) are being explored as potential essential technologies for future wireless communications. Accordingly, this paper provides a network framework for IRS-aided downlink NOMA transmission, in which IRS is employed to improve the NOMA system’s transmission performance, and optimization problems are raised to maximize the achievable rate. Given the fractional structure of multivariate coupling as presented in this study, the fractional problem first converts to a linear form; then, the semidefinite relaxation (SDR) algorithm is proposed to address nonconvex issues for a single-user scenario. As for a multiuser scenario, the alternating optimization (AO) algorithm is raised based on transmit beamforming and reflection phase shift matrix to settle relevant issues and mitigate computational complexity. The simulation results suggest that the algorithm described in this paper can significantly increase the signal’s achievable rate compared to the nondeployed IRS and IRS random phase-shifting schemes.

Tao Hong, Yixuan Jiang, Cui Wang

The aim of this study is to solve the problem of RFID reader antenna deployment when an obstacle in the environment or the material itself is an obstacle. The article establishes a new reader antenna constraint model based on the rectangular obstacle RFID antenna deployment optimization environment model and the reader antenna sensing model containing Gaussian distribution noise probability and applies the improved firefly algorithm to find the optimum with coverage rate, interference degree, and load balance function as multiobjective functions. First, to obtain a uniform traversal of the target space, and a cube mapping is applied for chaos initialization. Second, a weighting model is proposed to control the speed of firefly variation and combine the variable step strategy of elite individuals to expand the movement step of elite individuals and reduce the movement step of nonelite individuals to improve population diversity. Finally, to improve the algorithm’s continuous optimality-seeking ability, a Gaussian variation operation strategy based on elite fireflies is introduced to ensure the algorithm’s optimality-seeking throughout the process.

M. Humayun, Bushra Hamid, Noor Zaman Jhanjhi et al.

5G is expected to bring tremendous advancement in wireless cellular network by providing faster speed, high capacity and low latency. It has widely been adopted in various parts of the world and is expected to bring a noteworthy revolution in major industries and overall economies. Although 5G service providers are promising integrity, confidentiality and availability of data, still security is an important concern that needs to be addressed. This paper provides a detailed survey on 5G security by addressing 5G opportunities, common threats targeting 5G network along with their mitigation strategies, security services offered by 5G networks and 5G security challenges. We have also provided a case study to demonstrate the potentials of 5G. This survey will help 5G researchers, service providers and 5G users in getting quick awareness of 5G network.

S. Khan

Lihuan Huo, Rulong Bai, Fei Xue et al.

In this paper, an improved array synthesis method with array errors is proposed for large aperture arrays. Because of the array errors such as amplitude-phase errors and positions errors, the performance of the array synthesis is reduced seriously. Firstly, the ideal fast low sidelobe synthesis method is obtained based on the discrete Fourier transform (DFT) method. Then, by using Taylor expansion to remove the coupling relationship between the position of the element and the scanning angle, the compensation matrix for the pattern function and the array weighted vector with amplitude phase and position errors are derived. At last, the conversion relationship between the array with errors and the array weight vector is corrected in the iterative process. The theoretical simulation experiments verify the effectiveness and robustness of the proposed method for the linear array and rectangular array pattern synthesis. Then, the influence of Taylor expansion order on the pattern synthesis results is analysed.

Yijuan Huang

Aiming at the problems of low user satisfaction and long response time in traditional online English education platforms, this paper designs a web-based online English education platform and carries out relevant application tests. With the support of the web, the hardware and software of the platform are designed. The hardware of the platform is composed of student module, teacher module, administrator module, and database module. On this basis, the K-means clustering method is used to cluster the learner data in the web, to determine their English level, and the collaborative filtering algorithm is combined to recommend relevant course materials for learners so as to complete the platform software design. The application test results show that the platform has the advantages of superior function and security, high user satisfaction, and short response time and has certain practical application value.

Yifei Wei, Zhaoying Wang, Da Guo et al.

To reduce the transmission latency and mitigate the backhaul burden of the centralized cloud-based network services, the mobile edge computing (MEC) has been drawing increased attention from both industry and academia recently. This paper focuses on mobile users’ computation offloading problem in wireless cellular networks with mobile edge computing for the purpose of optimizing the computation offloading decision making policy. Since wireless network states and computing requests have stochastic properties and the environment’s dynamics are unknown, we use the model-free reinforcement learning (RL) framework to formulate and tackle the computation offloading problem. Each mobile user learns through interactions with the environment and the estimate of its performance in the form of value function, then it chooses the overhead-aware optimal computation offloading action (local computing or edge computing) based on its state. The state spaces are high-dimensional in our work and value function is unrealistic to estimate. Consequently, we use deep reinforcement learning algorithm, which combines RL method Q-learning with the deep neural network (DNN) to approximate the value functions for complicated control applications, and the optimal policy will be obtained when the value function reaches convergence. Simulation results showed that the effectiveness of the proposed method in comparison with baseline methods in terms of total overheads of all mobile users.

B. M. Havermans, E. Brouwers, R. A. Hoek et al.

BackgroundWork stress prevention can reduce health risks for individuals, as well as organisational and societal costs. The success of work stress interventions depends on proper implementation. Failure to take into account the needs of employees and supervisors can hinder intervention implementation. This study aimed to explore employee and supervisor needs regarding organisational work stress prevention.MethodsSemi-structured telephone interviews were conducted with employees (n = 7) and supervisors (n = 8) from different sectors, such as the finance, health care, and services industry. The interviews focused on respondents’ needs regarding the prevention of work stress within an organisational setting. Performing thematic analysis, topics and themes were extracted from the verbatim transcribed interviews using Atlas.ti.ResultsBoth employees and supervisors reported a need for: 1) communication about work stress, 2) attention for determinants of work stress, 3) supportive circumstances (prerequisites) for work stress prevention, 4) involvement of various stakeholders in work stress prevention, and 5) availability of work stress prevention measures. Both employees and supervisors expressed the need for supervisors to communicate about work stress. Employees and supervisors reported similar psychosocial work factors that should be targeted for prevention (e.g., social support and autonomy). There was greater variety in the sub-themes within communication about work stress and supportive circumstances for work stress prevention in supervisor responses, and greater variety in the sub-themes within availability of work stress prevention measures in employee responses.ConclusionsBoth employees and supervisors were explicit about who should take part in communication about work stress, what prerequisites for work stress prevention should exist, and which stakeholders should be involved. These results can inform work stress prevention practice, supporting selection and implementation of interventions.Trial registrationThis study was registered in the Netherlands National Trial Register, trial code: NTR5527.

Hisham Khalil, M. Mansoor Ahmed, Umair Rafique

This paper presents the design of nose-cone conformal substrate-integrated waveguide (SIW) slot array antenna for modern radar applications. Firstly, the wave propagation characteristics have been investigated in doubly curved SIW, and it has been observed that they are non-uniform along the longitudinal direction of nose-cone conformal SIW. To ensure the constant wave propagation along the length of conformal SIW, the conventional design of SIW is reformulated for nose-cone conformal SIW and circuit model modification has been demonstrated. Secondly, the procedure for designing a SIW-based array on curved surfaces has been developed. In the proposed design, rectangular waveguide (RWG) to SIW feeding structure has been used to avoid spurious radiations. Finally, 1 × 6 element-based nose-cone conformal slotted array has been designed and compared with planar and cylindrical conformal arrays. It has been observed from the results that the nose-cone conformal slot array offers low sidelobe levels (SLLs) and high gain. For the validation of the proposed design, the conformal slotted array has been fabricated and measured, which exhibited a reasonable agreement between the measured and the simulated data.

Kai Wang, Ling Wang, Jian Xie et al.

In order to deal with the problem of passive mixed source localization under unknown mutual coupling, the authors propose an effective algorithm. This algorithm provides array blind calibration as well as classification and localization of mixed sources in this paper. In practice, an ideal sensor array without the effects of unknown mutual coupling is rarely satisfied, which degrades the performance of most high-resolution algorithms. Firstly, the directions of arrival of far-field sources and the number of nonzero mutual coupling coefficients are estimated directly through the rank-reduction type method. Then, these estimates are adopted to reconstruct the mutual coupling matrix. In addition, the fourth-order cumulant technique is required to eliminate the Gauss colored noise effects caused by mutual coupling calibration of the raw received data vector. Finally, in an algebraic way, the results of rapid classification and localization of near-field sources are obtained without any spectral search. The proposed algorithm is described in detail, and its behavior is illustrated by numerical examples.

Sojib Bin Zaman, Naznin Hossain, S. Ahammed et al.

Keeping up with a sound health is a fundamental right for the human beings. It also acts as an indicator of the socio-economic development of a country. However, nowadays keeping sound health is challenging because of rapidly increasing non-communicable diseases. Concurrently, we are on the edge of very fast technological advancement which includes usage of cellular technology, high-speed internet and wireless communications. These technologies and their unique applications are creating lots of new dimensions in health care system which is known as e-Health. The medical call centers, emergency toll-free telephone services are being used in all over the world. The newly developed electronic health system can play a vital role in the remote regions of emerging and developing countries although sometimes it seems difficult due to the lack of communication infrastructure. E-Health can be a promising aspect for providing public health benefits if it integrates with the conventional medical system. More strategic approaches are necessary for the planning, development, and evaluation of e-Health. This article is written to depict the existing and future opportunities of e-Health in health support system.

Jinzhu Zhou, Haitao Li, Le Kang et al.

An active skin antenna with structural load-bearing and electromagnetic functions is usually installed in the structural surface of mobile vehicles such as aircrafts, warships, and high-speed train. This paper presents the design, fabrication, and testing of a novel active skin antenna which consists of an encapsulation shell, antenna skin, and RF and beam control circuits. The antenna skin which consists of the facesheet, honeycomb, array framework, and microstrip antenna elements was designed by using Bayesian optimization, in order to improve the design efficiency. An active skin antenna prototype with 32 microstrip antenna elements was fabricated by using a hybrid manufacturing method. In this method, 3D printing technology was applied to fabricate the array framework, and the different layers were bonded to form the final antenna skin by using traditional composite process. Some experimental testing was conducted, and the testing results validate the feasibility the proposed antenna skin structure. The proposed design and fabrication technique is suitable for the development of conformal load-bearing antenna or smart skin antenna installed in the structural surface of aircraft, warships, and armored vehicles.

Xiaohong Tian, Chunqin Liu, Guiyuan Zou et al.

V. Sharma, Chien-Chung Shen