This paper investigates the incentives of invest in improving quality （as opposed to investments in new activities） in the telecommunications industry, based on the example of wireless markets. What is the impact of...This paper investigates the incentives of invest in improving quality （as opposed to investments in new activities） in the telecommunications industry, based on the example of wireless markets. What is the impact of competition on incentives to invest, and on capacities to invest？ What is the role of the rate of penetration and technical progress？ This paper highlights the fact that investment incentives are positively related to potential for technical progress. Investment incentives also depend on market structure, competition intensity, and penetration rate, but not monotonically. This paper consists of a theoretical part which, under assumptions of full market coverage and market share symmetry, shows that for each national market, there is a target level of investment which companies strive to achieve but had not exceeded, and an empirical part that confirms the findings of the theoretical part and explains the differences with the theoretical part by relaxing the assumptions of full coverage and market share symmetry. This target level on the one hand depends on the potential for technical progress and on the other hand, depends on the rate of penetration. From a social perspective, this target level is the best amount that companies are encouraged to invest. Non-achievement of the target level entails underinvestment and a decrease in consumer surplus and welfare and may slow down technical progress. A data set covering 30 countries over a period of eight years is used to empirically prove the existence of a change in investment behavior depending on whether or not the target level is achieved. A low margin per user may hamper achievement of the target level. As a result, maximum consumer surplus and welfare occur under imperfect competition but not under perfect competition.展开更多
This paper has identified the main research and development programs in HAPS and their applications across the world.The spectrum and licensing issues are presented according to the latest ITU recommendations.To make ...This paper has identified the main research and development programs in HAPS and their applications across the world.The spectrum and licensing issues are presented according to the latest ITU recommendations.To make HAPS play a vital role in the integrated telecommunication and broadcast network in the future,some proposals are given.展开更多
The current study endeavours to examine the extent to how authenticity, usage, and intensity of native English instruction impact EFL students behaviourally and linguistically at the preparatory year programme in CTE,...The current study endeavours to examine the extent to how authenticity, usage, and intensity of native English instruction impact EFL students behaviourally and linguistically at the preparatory year programme in CTE, where students undertake an intensive English course for one year. The programme is managed by an American company called Interlink and is entirely staffed by native English teachers. The implementation of this English instruction encompasses motivational, pedagogical, and administrative challenges that hinder its practicality for positive and achievable learning outcomes. To this end, this paper will attempt to address the sociolinguistic and historical profile of EFL in Saudi Arabia in order to present an overall picture of this study＇s context.展开更多
Thirty years ago,backward telecom- munications infrastructure and net- work technology fell far short of the demand to promote the fast devel- opment of all sectors in society,particularly constraining China's eco...Thirty years ago,backward telecom- munications infrastructure and net- work technology fell far short of the demand to promote the fast devel- opment of all sectors in society,particularly constraining China's economic growth.But over the past thirty years China's telecom industry has developed by leaps and bounds.展开更多
The proliferation of internet communication channels has increased telecom fraud,causing billions of euros in losses for customers and the industry each year.Fraudsters constantly find new ways to engage in illegal ac...The proliferation of internet communication channels has increased telecom fraud,causing billions of euros in losses for customers and the industry each year.Fraudsters constantly find new ways to engage in illegal activity on the network.To reduce these losses,a new fraud detection approach is required.Telecom fraud detection involves identifying a small number of fraudulent calls from a vast amount of call traffic.Developing an effective strategy to combat fraud has become challenging.Although much effort has been made to detect fraud,most existing methods are designed for batch processing,not real-time detection.To solve this problem,we propose an online fraud detection model using a Neural Factorization Autoencoder(NFA),which analyzes customer calling patterns to detect fraudulent calls.The model employs Neural Factorization Machines(NFM)and an Autoencoder(AE)to model calling patterns and a memory module to adapt to changing customer behaviour.We evaluate our approach on a large dataset of real-world call detail records and compare it with several state-of-the-art methods.Our results show that our approach outperforms the baselines,with an AUC of 91.06%,a TPR of 91.89%,an FPR of 14.76%,and an F1-score of 95.45%.These results demonstrate the effectiveness of our approach in detecting fraud in real-time and suggest that it can be a valuable tool for preventing fraud in telecommunications networks.展开更多
文摘This paper investigates the incentives of invest in improving quality （as opposed to investments in new activities） in the telecommunications industry, based on the example of wireless markets. What is the impact of competition on incentives to invest, and on capacities to invest？ What is the role of the rate of penetration and technical progress？ This paper highlights the fact that investment incentives are positively related to potential for technical progress. Investment incentives also depend on market structure, competition intensity, and penetration rate, but not monotonically. This paper consists of a theoretical part which, under assumptions of full market coverage and market share symmetry, shows that for each national market, there is a target level of investment which companies strive to achieve but had not exceeded, and an empirical part that confirms the findings of the theoretical part and explains the differences with the theoretical part by relaxing the assumptions of full coverage and market share symmetry. This target level on the one hand depends on the potential for technical progress and on the other hand, depends on the rate of penetration. From a social perspective, this target level is the best amount that companies are encouraged to invest. Non-achievement of the target level entails underinvestment and a decrease in consumer surplus and welfare and may slow down technical progress. A data set covering 30 countries over a period of eight years is used to empirically prove the existence of a change in investment behavior depending on whether or not the target level is achieved. A low margin per user may hamper achievement of the target level. As a result, maximum consumer surplus and welfare occur under imperfect competition but not under perfect competition.
文摘This paper has identified the main research and development programs in HAPS and their applications across the world.The spectrum and licensing issues are presented according to the latest ITU recommendations.To make HAPS play a vital role in the integrated telecommunication and broadcast network in the future,some proposals are given.
文摘The current study endeavours to examine the extent to how authenticity, usage, and intensity of native English instruction impact EFL students behaviourally and linguistically at the preparatory year programme in CTE, where students undertake an intensive English course for one year. The programme is managed by an American company called Interlink and is entirely staffed by native English teachers. The implementation of this English instruction encompasses motivational, pedagogical, and administrative challenges that hinder its practicality for positive and achievable learning outcomes. To this end, this paper will attempt to address the sociolinguistic and historical profile of EFL in Saudi Arabia in order to present an overall picture of this study＇s context.
文摘Thirty years ago,backward telecom- munications infrastructure and net- work technology fell far short of the demand to promote the fast devel- opment of all sectors in society,particularly constraining China's economic growth.But over the past thirty years China's telecom industry has developed by leaps and bounds.
基金This research work has been conducted in cooperation with members of DETSI project supported by BPI France and Pays de Loire and Auvergne Rhone Alpes.
文摘The proliferation of internet communication channels has increased telecom fraud,causing billions of euros in losses for customers and the industry each year.Fraudsters constantly find new ways to engage in illegal activity on the network.To reduce these losses,a new fraud detection approach is required.Telecom fraud detection involves identifying a small number of fraudulent calls from a vast amount of call traffic.Developing an effective strategy to combat fraud has become challenging.Although much effort has been made to detect fraud,most existing methods are designed for batch processing,not real-time detection.To solve this problem,we propose an online fraud detection model using a Neural Factorization Autoencoder(NFA),which analyzes customer calling patterns to detect fraudulent calls.The model employs Neural Factorization Machines(NFM)and an Autoencoder(AE)to model calling patterns and a memory module to adapt to changing customer behaviour.We evaluate our approach on a large dataset of real-world call detail records and compare it with several state-of-the-art methods.Our results show that our approach outperforms the baselines,with an AUC of 91.06%,a TPR of 91.89%,an FPR of 14.76%,and an F1-score of 95.45%.These results demonstrate the effectiveness of our approach in detecting fraud in real-time and suggest that it can be a valuable tool for preventing fraud in telecommunications networks.
