Traditional recommendation algorithms predict the latent interest of an active user by collecting rating information from other similar users or items.Recently,more and more recommendation systems attempt to involve s...Traditional recommendation algorithms predict the latent interest of an active user by collecting rating information from other similar users or items.Recently,more and more recommendation systems attempt to involve social relations to improve recommendation performance.However,the existing works either leave out the user reliability or cannot capture the correlation between two users who are similar but not socially connected.Besides,they also take the trust value between users either 0 or 1,thus degenerating the prediction accuracy.In this paper,we propose an efficient social affect model,multi-affect(ed),for recommendation via incorporating both users'reliability and influence propagation.Specifically,the model contains two main components,i.e.,computation of user reliability and influence propagation,designing of user-shared feature space.Firstly,a reliability calculation strategy based on user similarity is developed for measuring the recommendation accuracy between users.Then,the factor of influence propagation relationship among users is taken into consideration.Finally,the multi-affect(ed)model is developed with user-shared feature space to generate the predicted ratings.Experimental results demonstrate that the proposed model achieves better accuracy than other counterparts recommendation techniques.展开更多
Inertia-gravity waves play an increasingly important role in the middle atmosphere dynamics. As a result, more attention has been paid to the study of inertia-gravity waves, especially to the middle atmosphere gravity...Inertia-gravity waves play an increasingly important role in the middle atmosphere dynamics. As a result, more attention has been paid to the study of inertia-gravity waves, especially to the middle atmosphere gravity waves. This paper presents some aspects of inertia-gravity waves with emphasis on the propagation. Two methods are used here, namely, geometric optical method and physical optical method. We can see from the study that inertia-gravity waves are similar to planetary waves in some respects and they are different from planetary waves in others.展开更多
The gravity wave breaking is crucial to the large-scale circulation of middle atmosphere. In this paper, we follow Lindzen (1981) to draw out the parameterization of two-dimensional gravity wave breaking including ine...The gravity wave breaking is crucial to the large-scale circulation of middle atmosphere. In this paper, we follow Lindzen (1981) to draw out the parameterization of two-dimensional gravity wave breaking including inertial effect. Also we present some properties of critical levels and inertial critical levels.展开更多
We show that bi-soliton which is a periodically stationary pulse consisting of two peaks can propagate in a dispersion-managed line under the influence of third-order dispersion. Numerical averaging method is used to ...We show that bi-soliton which is a periodically stationary pulse consisting of two peaks can propagate in a dispersion-managed line under the influence of third-order dispersion. Numerical averaging method is used to extract bi-soliton from a couple of Gaussian pulses and its stability is studied by a free propagation for a long distance.展开更多
基金the National Natural Science Foundation of China(Grant Nos.61762078,61363058,61966009,61762079,U1711263,U1811264)Guangxi Key Laboratory of Trusted Software(kx202003)Major Project of Young Teachers'Scientific Research Ability Promotion Plan(NWNU-LKQN2019-2).
文摘Traditional recommendation algorithms predict the latent interest of an active user by collecting rating information from other similar users or items.Recently,more and more recommendation systems attempt to involve social relations to improve recommendation performance.However,the existing works either leave out the user reliability or cannot capture the correlation between two users who are similar but not socially connected.Besides,they also take the trust value between users either 0 or 1,thus degenerating the prediction accuracy.In this paper,we propose an efficient social affect model,multi-affect(ed),for recommendation via incorporating both users'reliability and influence propagation.Specifically,the model contains two main components,i.e.,computation of user reliability and influence propagation,designing of user-shared feature space.Firstly,a reliability calculation strategy based on user similarity is developed for measuring the recommendation accuracy between users.Then,the factor of influence propagation relationship among users is taken into consideration.Finally,the multi-affect(ed)model is developed with user-shared feature space to generate the predicted ratings.Experimental results demonstrate that the proposed model achieves better accuracy than other counterparts recommendation techniques.
文摘Inertia-gravity waves play an increasingly important role in the middle atmosphere dynamics. As a result, more attention has been paid to the study of inertia-gravity waves, especially to the middle atmosphere gravity waves. This paper presents some aspects of inertia-gravity waves with emphasis on the propagation. Two methods are used here, namely, geometric optical method and physical optical method. We can see from the study that inertia-gravity waves are similar to planetary waves in some respects and they are different from planetary waves in others.
文摘The gravity wave breaking is crucial to the large-scale circulation of middle atmosphere. In this paper, we follow Lindzen (1981) to draw out the parameterization of two-dimensional gravity wave breaking including inertial effect. Also we present some properties of critical levels and inertial critical levels.
文摘We show that bi-soliton which is a periodically stationary pulse consisting of two peaks can propagate in a dispersion-managed line under the influence of third-order dispersion. Numerical averaging method is used to extract bi-soliton from a couple of Gaussian pulses and its stability is studied by a free propagation for a long distance.
