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According to the technical conditions of guidance and the fire control for torpedo, based on a proper coordinate system, a kinematic model of the search trajectory of torpedo was established, and the optimal configurations of high speed and low speed were analyzed for the multi-speed torpedo. Aiming at the problem of large undershooting quantity in the case of the big bow bearing from target, an estimation...
We present a novel control architecture for the integration of visually guided walking and whole-body reaching in a humanoid robot.We propose to use robot gaze as a common reference frame for both locomotion and reaching, as suggested by behavioral neuroscience studies in humans. A gaze controller allows the robot to track and fixate a target object, and motor information related to gaze control is...
This article is devoted to the navigation tasks for space robots, which operates in the neighborhood of unstable libration point of the Earth-Sun and in the near-Earth space. Movement space robot is addressed under circular restricted three-body problem. The possibility of maneuvering in the near-Earth space with the return to neighborhood collinear libration points is shown.
Enabled by a dual-angle and dual-color illumination based computational on-chip imaging platform [7], here we reported the discovery of an entirely new swimming pattern, in the form of chiral ribbons, observed in human and horse sperms. We believe that this imaging platform could help us better understand the statistical behavior of various micro-swimmers and sperms of different species, shedding...
The high technical education systems subjects interaction for engineers individual training educational trajectories organization are considered in that paper. The profile training joint management and interactions stabilization methods are offered. The educational process block-modular system, which implements the proposed principles and methods, is represented.
Stroke recovery from offline handwriting is a very interesting research field. However, no standard benchmark is available for researchers in this field. The aim of this competition is to gather researchers and compare recent advances in stroke recovery from offline handwriting. This competition has been hosted on Kaggle, it has attracted 45 teams from both academia and industry. This paper gives...
This paper deals with convergence conditions of iterative learning control (ILC) for linear time-varying plants from a unified viewpoint to continuous-time and discrete-time cases. For a continuous-time plant, the corresponding discrete-time plant with a sampling period is obtained via delta operator. Then, a necessary and sufficient condition is given under which the tracking error of the discrete-time...
The ability to avoid obstacles during reaching in a virtual environment (VE) was compared between post-stroke individuals with well-recovered upper limbs (UL) and healthy controls. Stroke subjects ranked well in UL clinical assessments. However, even though well-recovered, stroke subjects still had residual movement deficits and made more errors in the obstacle avoidance reaching task compared to...
The entorhinal cortex (EC) plays a pivotal role for spatial representation and navigation in rat. Understanding how information is processed in the entorhinal cortex is essential to help us know the self-motion-based navigation. This article introduces the connection of entorhinal cortex and hippocampus, main cells in entorhinal cortex and their interactions, then put forward one model of the entorhinal...
Trajectory-based human activity recognition aims at understanding human behaviors in video sequences. Some existing approaches to this problem, e.g., hidden Markov models (HMM), have a severe limitation, namely the number of motions has to be preset. In fact, this number is difficult to define in advance in real practice. To overcome this shortcoming, we propose a new method for modeling human trajectories...
This paper empirically examines the impact of institutional ownership on the earnings announcement timing of manager based on the investors' limited attention in financial market using the quarterly earnings announcements data of A shares from January, 2007 to December, 2011. The results reveal that the influence trajectory is an inverted U-shaped curve, and the critical value is 39.19%. Increasing...
In this paper, we study the cluster dynamics during network evolution in human mobile network by analyzing the GPS trajectories of taxi collected in two different urban environment. We observe that the size distribution of small clusters exhibits persistence over time, and the behavior of large clusters becomes the key to distinguishing the network state at different time step during the evolution...
The recent increase in the use of GPS-enabled devices has introduced a new demand for efficiently storing trajectory data. In this paper, we present a new technique that has a higher compression ratio for trajectory data than existing solutions. This technique splits trajectories into sub-trajectories according to the similarities among them. For each collection of similar sub-trajectories, our technique...
Recent advances in information and communication technologies are leading to an environment where marine traffic (i.e., locate and track vessels) can be monitored in real time. For larger vessels, position information is collected by sniffing messages of AIS (Automatic Identification System), which they are obliged to install. However, for smaller vessels, such as fishing and pleasure boats, a lack...
Being able to understand dynamics of human mobility is essential for social management and urban planning. Based on the sociology of community, this paper chooses different types of communities as research objects, and then characterizes human mobility that describes most probable activities associated with them. With the analysis of thousands of digital footprint data in the urban district, we find...
While a substantial amount of big data are consumed via mobile devices, accessing content via wireless data connections on mobile devices has its own set of challenges. Among these challenges, speed of data transfer is usually our first priority. Although there are many fast data connections available for Web surfing (3G, LTE etc.), the actual connection speed could vary significantly among different...
Location-Based Services (LBS) are becoming more prevalent. While there are many benefits, there are also real privacy risks. People are unwilling to give up the benefits - but can we reduce privacy risks without giving up on LBS entirely? This paper explores the possibility of introducing uncertainty into location information when using an LBS, so as to reduce privacy risk while maintaining good quality...
The publication of trajectory data opens up new directions in studying human behavior, but it is challenging to perform in a privacy-preserving way. This is mainly because, the identities of individuals, whose movement is recorded in the data, can be disclosed, even after removing identifying information. Existing works to anonymize trajectory data offer privacy, but at a high data utility cost. This...
This paper reports a comparative experimental evaluation of one non-model-based proportional derivative (PD) 6 degree-of-freedom (6-DOF) controller and one model-based 6-DOF controller designed to enable fully actuated underwater vehicles to perform 6-DOF set-point regulation and trajectory tracking. We show analytically the non-model-based PD controller is capable of performing locally asymptotically...
This paper presents a speed sliding mode controller for a vector controlled (FOC) of the permanent magnet synchronous machine (PMSM) fed by a pulse width modulation voltage source inverter. The sliding mode control (SMC) is used to achieve robust performance against parameter variations and external disturbances. The problem with this conventional controller is that it has large chattering on the...
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