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The paper considers a reference-based control system for heaving wave energy converters. The proposed controller comprises two parts: lower level part (LLP) and higher level part (HLP). The HPL generates the buoy's velocity reference with the objective to maximize the power absorption with the constraints in the maximum control force and the power take-off device's utilization index. The index is...
We address two important issues in causal discovery from nonstationary or heterogeneous data, where parameters associated with a causal structure may change over time or across data sets. First, we investigate how to efficiently estimate the "driving force" of the nonstationarity of a causal mechanism. That is, given a causal mechanism that varies over time or across data sets and whose...
The thumb and index finger are important digits to performed dexterous and complex manipulation of objects. However, the local muscle fatigue will induce the capacity of force production and impair the precision motor control of the thumb and index finger. This study focused on the exercise-induced local muscle fatigue influencing the COP (center of pressure) area, the SD and the PA (projection angle)...
Predicting hand gestures and finger movements include a wide range of applications in different fields such as human computer interaction, rehabilitation, and prosthesis control. Research in this area, mainly focuses on hand gesture classification which limits the ability of the system to a set of predefined gestures and also limits the ability to control fine finger movements. Force Myography (FMG)...
One of the most challenging issues of granular jamming robots is both predicting and measuring the stiffness variations which are a direct function of elastic module. In this regard, in previous researches, it had demonstrated that the elastic module of robot's bulk is a fundamental function of vacuum pressure and must be acquired by experimental tests. However, there was not a unique formulation...
This paper presents the implementation of a Finger force detection platform capable to measure the exerted forces by the index, middle, ring and little finger in single-axis direction (flexion); and in dual-axis direction (flexion/adduction) by the thumb. It can be adapted to different sizes in both right or left hand. A test protocol is established. Also, a Graphical User Interface (GUI) is developed...
With rapid improvement in information and communication technologies, industrial automation systems are under the revolution. Legacy industrial automation systems lack flexibility and interoperability due to multi-layered architecture. From industrial cyber-physical system point of view, a new system architecture is needed to allow vertical and horizontal integration between all devices and systems...
The repeated locking-releasing device is used to extend the application range of payload in space. A repeated locking-releasing device with a slider crank mechanism and an electromagnetic device is presented. The key components, including the support and slider crank mechanism, are optimized. The simulation analysis is carried out to get the kinematics characteristics of this device. The sample is...
Picosatellite deployer is used for carrying and releasing picosatellites during the launching and in space respectively. For releasing several picosatellites placed in one deployer controllably, one design scheme based on memory alloy spring is presented to make arbitrary picosatellite have the same separation velocity with combination springs. The key components of deployer are optimized and its...
Isotropy analysis of workspace plays a critical role in improving the quality of workspace for parallel manipulators. Although various workspace determination approaches have been studied intensively for parallel manipulators in the past decades, workspace isotropy analysis for parallel manipulators has been seldom touched. This paper proposes two novel workspace geometric shape isotropy indices,...
Lightweight structures find more and more applications in both vehicle and ship industries. To meet a growing demand, a variety of different types of joisted panels have been developed during the last few decades. One of the problems to deal with is the assessment of the acoustic performances of such panels once they are already mounted in their final place. In this case, it can be of importance to...
Nowadays, as the number of patients due to stroke increases, interest in rehabilitation treatment has increased and various rehabilitation treatment methods have been developed. In addition, since effective rehabilitation treatment requires quantitative and objective motor function evaluation, several devices were developed and studied. In case of the hand, however, the device which evaluates the...
We propose a device that can display translational force and torque by using two vibration speakers. Each vibration speaker generates an asymmetric vibration when a sound with an asymmetric amplitude is inputted. Asymmetric vibrations induce perceived forces that pull or push a user's hand in a particular direction. The user can perceive translational force and/or torque with his/her thumb and index...
It is known that a pseudo force sensation of pulling in one direction is generated by presenting an asymmetrical vibration stimulus with different accelerations in a round trip. The present study employed a similar phenomenon using the asymmetric rotational vibration of a direct-current motor to present the pseudo force sensation to multiple fingertips. We investigated the frequency characteristics...
In this work, the ∞-norm based input-output force transmission (IOFT) characteristic of a 3T1R type cable-driven parallel mechanism (CDPM) with five cables is analyzed. It is confirmed from simulation results that the proposed CDPM has adequate characteristics for haptic applications. In addition, its 1-norm and 2-norm based IOFT characteristics are analyzed.
This paper addresses the concept of the classification of exceptional events (EE) introduced, in 2013, during the revision of the Portuguese quality of electricity supply code. An exceptional event is classified as such by the Portuguese national regulatory authority after a request from the network operator. The request must include a detailed description of the incident and the collected evidence,...
Using the case of organization H, this paper studies the current development of scientific and technological talents. Based on recent research in this filed, we develop an index system of incentive factors, including material incentive, implicit incentive, support incentive and growth incentive. Then we survey 244 scientific and technological talents and use factor analysis method to study the valid...
The integration of Internet-of-Thing (IoT) devices to smart buildings raises the risk of vulnerabilities in building operation. This paper presents the software development work for the secure deployment of IoT devices in commercial buildings. Security threats with their countermeasures are analyzed in the context of a specific Building Automation System (BAS) implementation called Building Energy...
Root canal treatment (RCT) deals with repairing and saving the tooth that is badly decayed or becomes infected. Endodontic means treating tooth from inside. Obturation is a process of complete filling and sealing of 3D root canal space with gutta percha as biocompatible sealing material against bacterial growth. The main cause of Endodontic treatment failure is the incomplete sealing of the root canal...
The actual multi-agent system in a variety of complex network environment, the agent itself may be due to external attack led to the suspension of local exchange of information, The local information exchange between agents is also due to transmit and receive information associated with the communication time delay. In this paper, we study degree distribution entropy and the average two-step degree...
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