Social media enable users to express their emotion promptly, helping health policy makers to gauge public sentiment of disease outbreak. In this research, we developed an approach to social-media-based public health i...
详细信息
ISBN:
(纸本)9780996683111
Social media enable users to express their emotion promptly, helping health policy makers to gauge public sentiment of disease outbreak. In this research, we developed an approach to social-media-based public health informatics and built a proof-of-concept system named eMood that helps to collect, analyze, and visualize Ebola outbreak discussions on Twitter. Our approach uses a comprehensive lexicon to identify emotion categories and present analysis findings of users' network relationship and influence patterns. We compared two methods of identifying user influence, user centrality and emotion entrainment, by using 255,118 tweets posted by 210,900 users in January 2015. Experimental results show that both methods identified highly influential users. Regression analysis of user influence rank and emotion scores demonstrates significant relationship between user influence and each emotion category. These results should provide strong implication for understanding social actions and for collecting social intelligence for public health informatics.
Playing table tennis with human is a challenging work for robot. The common architecture for table tennis robot in the past researches are to gather information at first, then predict the ball status at hitting point,...
详细信息
ISBN:
(纸本)9781467396769
Playing table tennis with human is a challenging work for robot. The common architecture for table tennis robot in the past researches are to gather information at first, then predict the ball status at hitting point, and the motion mechanism moves according to the prediction at last. In order to save the time for the later two steps, the gathered information is limited. In this paper, we propose a new architecture, in which the robot would keep gathering the information and amending the prediction as the motion mechanism moves. To combine the gathered information and obtain reliable prediction of hitting point, a data processing algorithm is proposed. The algorithm is based on the kinetic analysis of the ball and the extended Kalman filter. The estimation of angular velocity measurement is also improved in this algorithm. Finally, the validity of the algorithm is confirmed by conducting experiments.
Point matching is a problem of finding the optimum matching between two sets of key points which are extracted from the surfaces of objects. A popular approach represents the features of a set of points with a graph m...
详细信息
ISBN:
(纸本)9781479970995
Point matching is a problem of finding the optimum matching between two sets of key points which are extracted from the surfaces of objects. A popular approach represents the features of a set of points with a graph model. Traditionally, the measurement applied in the graph model is the Euclidian distance, which is not suitable for objects with non-rigid deformations. In this paper, we propose a novel graph model called the geodesic graph model (GGM) which uses a geodesic-like distance as its measurement. GGM can better tackle non-rigid deformations because the geodesic-like distance is a kind of invariant structural feature during non-rigid deformations. The building process of the GGM is justified under the assumption that all the key points are spanning on a manifold. To further handle the deviations of key point locations, we come up with a feature weighting process to increase our algorithm's robustness. We conduct several experiments on different kinds of deformations over several widely used datasets. Experimental results demonstrate the effectiveness of our algorithm.
This paper provides an innovative design for a gliding robotic dolphin. In order to realize high maneuverability and long endurance, the robotic dolphin combines the advantages of both robotic dolphins and underwater ...
详细信息
ISBN:
(纸本)9781467396769
This paper provides an innovative design for a gliding robotic dolphin. In order to realize high maneuverability and long endurance, the robotic dolphin combines the advantages of both robotic dolphins and underwater gliders. It can not only realize fast and flexible dolphin-like swimming depending on the powerful propulsive posterior body and fluke, but also implement gently and durable gliding motion due to the buoyancy-driven system. More importantly, the controllable pectoral fins and horizontal fluke can effectively complete the attitude adjustment, so traditional internal movable masses could be removed for saving a considerable space. Besides, the hydrodynamic analysis in the steady gliding motion is executed and hydrodynamic coefficients including lift, drag, and pitching moment are also obtained through Computational Fluid Dynamics (CFD) method. Finally, extensive experiments including dolphin-like swimming, spiraling motion and gently gliding motion illustrate the great locomotion ability of the developed gliding robotic dolphin.
The delta parallel mechanism has proven to be a very successful parallel robot design and a number of variants have been proposed in the literature. Taking advantage of its simple construction and the intrinsic featur...
详细信息
This paper studies the output consensus problem of single-input single-output(SISO)multi-agent *** is assumed that the multi-agent system works in a noisy environment(state noises,measurement noises and communication ...
详细信息
ISBN:
(纸本)9781479947249
This paper studies the output consensus problem of single-input single-output(SISO)multi-agent *** is assumed that the multi-agent system works in a noisy environment(state noises,measurement noises and communication noises).A dynamic output-feedback based protocol is proposed to solve the stochastic output consensus problem in this *** is proved that the mathematical expectations of relative outputs between agents are convergent to zero,and the second-order moments of relative outputs between agents are uniformly ***,some simulation examples are presented to demonstrate this phenomenon.
The coordinated tracking problem of networked Euler-Lagrange systems is studied in this *** to the knowledge of classical control,an integral term can eliminate the steady-state error when solving the tracking problem...
详细信息
ISBN:
(纸本)9781479947249
The coordinated tracking problem of networked Euler-Lagrange systems is studied in this *** to the knowledge of classical control,an integral term can eliminate the steady-state error when solving the tracking problem.A proportional-integral-derivative(PID)tracking protocol is then rst proposed to solve the tracking problem of Euler-Lagrange systems where the leader has a quadratic *** properly choosing parameters,it is proved that all followers can asymptotically track the leader’s quadratic trajectory if the communication topology graph has a spanning ***,a so-called PImD tracking protocol is derived by adding some high-order integral *** is shown that this PImD tracking protocol can solve the tracking problem of networked Euler-Lagrange systems with a leader having the higher-order polynomial ***,two simulation examples are presented to demonstrate the effectiveness of the proposed protocol.
Underwater cave exploration has always been a tough problem for autonomous underwater *** a primary step towards this problem,we explore the underwater cave search and entry with a free-swimming robotic fish character...
详细信息
ISBN:
(纸本)9781479947249
Underwater cave exploration has always been a tough problem for autonomous underwater *** a primary step towards this problem,we explore the underwater cave search and entry with a free-swimming robotic fish characterized by flexible control and embedded *** particular,we use a colored ring instead of the cave and acquire its contour by its binary *** we propose an algorithm combining the Meanshift algorithm with the bump characteristic of the ring contour to eliminate the mirror image effects and background *** a bio-inspired Central Pattern Generator control method is adopted to smoothly drive the robotic fish to swim towards the *** proposed algorithms are implemented in real time with a hybrid control system consisting of two embedded microprocessors(TI DM3730 and STMicroelectronics STM32F407).Preliminary aquatic experiments demonstrate that a fairly good exploration effect is resulted and the interference caused by mirror image effect and background is largely *** proposed robotic fish-based scheme offers an alternative to cave exploration in complex aquatic environments.
In fighting the coronary heart diseases,percutaneous coronary intervention is proved to be a powerful and reliable clinical procedure in the modern catheterization labs all over the *** to its minimally invasive chara...
详细信息
ISBN:
(纸本)9781479947249
In fighting the coronary heart diseases,percutaneous coronary intervention is proved to be a powerful and reliable clinical procedure in the modern catheterization labs all over the *** to its minimally invasive characteristics,the procedure must be performed in the image-guided way,which makes this important skill very difficult to *** make the learning more accessible,a computer-aided surgical simulator is planned to be implemented in our *** now,the prototyping model is completed and the further validation is being *** implementing the virtual anatomic environment,we aim to provide the trainee an intuitive visual effect so that the models of the organs bear resemblance to their counterpart of the human'*** the blood vessels per se,the surrounding organs seen in the real surgery also need to be visualized during the *** heart is undoubtedly the most critical one among *** segmentation of the heart is a challenging task because of the noisy and indistinct boundaries of the heart in the images due to the natural heart beating during the image *** this paper,an approach based on the active contours method is developed to fulfill this *** experimental results demonstrate the effectiveness of our approach.
暂无评论