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To ensure satisfactory control performance for the newly designed cable-driven manipulator with complex unknown lumped disturbance, a sliding mode control (SMC) method based on time delay estimation (TDE) is proposed and investigated in this paper. The proposed method mainly has two elements, the TDE element used to properly estimate and compensate the lumped unknown dynamics of the system, and the...
The acoustic microstreaming originating from microbubbles' linear oscillations can be used as a potential cell sonoporation tool for drug delivery and gene transfection. However, this bubble-based method suffers from bubble instability, non-uniform size, unreliable performance, and inconvenient trapping. In order to overcome the above drawbacks, in this study, we proposed a massive drug delivery method...
Externally controlled drug release from nanoscale drug delivery systems hold great potential to increase local deposit. Here, we introduce an ultrasound-activatable porphyrin-phospholipid liposome (PPL) to show its controllable drug release, enhanced imaging signals, and efficient therapeutic actions.
Phase weighting at the subarray level alone causes grating lobes (GLs) in the far field pattern. In this paper, a technique for reducing GLs in phased arrays with regular subarray architectures is proposed. Two measures are used in this method. They are: (1) integrating a power divider with phase difference among output ports for each subarray, which controls the each subarray pattern has a different...
In this paper, the implementation of the sources for scattering and radiation of the discontinuous Galerkin time domain method (DGTD) are presented. Based on formulations of the DGTD method, the sources implementation procedure is given, including the incident plane wave generated for scattering and the modeling of a coaxial port feed for antenna radiation. Numerical examples of PEC almond scattering...
We demonstrate that the scattering patterns of a phased array can be controlled with switches loaded annular slot elements. When these switches are off, the elements can radiate efficiently as annular slot antennas. On the other hand, when these switches are on, the incident wave can be reflected by these elements to a desired angle, determined by the locations of the switches.
This paper focuses on optimizing the robustness of a timetable with multiple train lines of different frequencies, where overtakings are also taken into account. An optimization model is considered of a cyclic railway timetable problem where dwell times and running times are variable and overtaking is allowed for relevant stations and each line. Based on the Periodic Event Scheduling Problem, train...
Driver's uncertainty during decision-making in overtaking results in long reaction times and potentially dangerous lane change maneuvers. Current lane change assistance systems focus on safety assessments providing either too conservative or excessive warnings, which influence driver's acceptance and trust in these systems. Inspired by the emancipation theory of trust, we expect systems providing...
We present an approach to automatically generating verbal commentaries for tennis games. We introduce a novel application that requires a combination of techniques from computer vision, natural language processing and machine learning. A video sequence is first analysed using state-of-the-art computer vision methods to track the ball, fit the detected edges to the court model, track the players, and...
Return-Oriented Programming (ROP) has become a widespread technique in recent software exploits. Various defenses have been proposed to thwart ROP, including randomization, Control-Flow Integrity (CFI), etc. However, ROP attacks have not been eliminated completely yet. Recently, ROP defenses based on stack pivot detection are put forward. In this paper, we investigate the checking mechanism in existing...
Multilabel classification is a challenging research problem in which each instance is assigned to a subset of labels. Recently, a considerable amount of research has been concerned with the development of “good” multi-label learning methods. Despite the extensive research effort, many scientific challenges posed by e.g. highly imbalanced training sets and correlation among labels remain to be addressed...
Measuring the pressure inside the compact sealed electronic vacuum devices is a difficult proposition that typically requires destructive analysis. In the paper, we offer an indirectly method to pressure measurement without operating the devices. Towards that end, a simple and compact Penning-type diacharge structure only include two electrodes and an additional permanent magnet is established. The...
The therapeutic effect of chemotherapy of glioblastoma is very limited due to the existence of blood-brain barrier. Focused ultrasound combined with microbubbles is an attractive method to deliver therapeutic agents to brain tissue noninvasively, transiently and locally. Paclitaxel is a potent anti-cancer agent. Thus, the objective of this study is to investigate the therapeutic effect of paclitaxel...
In the paper, the influence of covered gas and oxidization of molybdenum electrode surface on the field emission current at the initiation of high voltage vacuum breakdown is presented. Since enhanced field emission (EFE) is often observed there, we have investigated the influence of covered gas and oxides on the EFE of Mo by means of a field emission vacuum system (FEVS) and the field emission current...
Bias field which existed in MR image had an unfavorable influence on analyzing medical image, especially for medical image segmentation. To solve it, this paper proposed an approach which is based on energy minimization to estimate bias field where exists in the MR image, finish brain tissue segmentation, meanwhile. This method fully utilize the properties of factual information and bias information...
Beijing Metro plans to open an Automated Urban Guided Transport (AUGT) Line at the end of 2017. The line will follow GOA4 requirements according to IEC62290-2014 and IEC62267-2009. The main difference between the AUGT line and existing line is no driver or attended people on the train. The system will realize the following functions: Ensure safety movement, Driving Supervising guideway, supervising...
To solve the problem of cooperative task reallocation for large-scale unmanned aerial vehicle (UAV) team under complex dynamic environment, a method based on man in-loop consensus auction principle is proposed. Firstly, Delaunay diagram is used for environment modeling. Then, the shortest paths of UAVs to targets are obtained by using Warshall-Floyd algorithm, thus task allocation and path planning...
A small low-multipath antenna is proposed in this paper for global navigation satellite system (GNSS) applications. An annular slot loaded ground plane (ASLGP) is adopted to reduce the multipath interference of the proposed antenna. The radiation field of the slot can be adjusted to cancel out the backward radiation. A prototype antenna operating at L1 (1.575 GHz) band is fabricated and measured....
An innovative algorithm within the perturbed compressive sampling (PCS) framework is presented for the synthesis of planar sparse arrays with multiple arbitrary patterns. The propoesed method employs an alternative decent strategy to deal with the complex or asymetrical patterns. Also, it can simultaneously give the common element positions and different element excitations for multiple patterns by...
Full information (FI) control for output regulation based on the internal model principle requires that the state vectors of the plant and reference models be available for both feed-forward and feedback controllers. However in practice neither of the state vectors is available, and often only the tracking error between the plant output and reference trajectory can be measured. This gives rise to...
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