Photoacoustic (PA) imaging has gained much attention, providing structural and functional information in combination with clinical ultrasound (US) systems. 2D PA US is easily implemented, but its heavy dependence on operator skills makes 3D preferable. In this study, we propose a panoramic volumetric system equipping handheld scanner weighing 600 g measuring 70 × 62 110 mm3. Multiple PA/US scans were performed to cover large field-of-view (FOV), the acquired volumes mosaic-stitched after...

The aim of this letter is to improve the performance clock synchronization in EtherCAT networks. Although synchronizes slave clocks reference using a distributed mechanism, error still exists between them. We propose method estimate and significantly reduce error. In addition, we implement within existing mechanism without adding an excessive computational load. experimental results for verify that proposed improves accuracy

A direct deadbeat voltage control design method for inverter-based microgrid applications is proposed in this paper. When the inductor-capacitor (LC) filter output directly controlled using source inverters (VSIs), plant dynamics exhibit second-order resonant characteristics with a load current disturbance. To effectively damp resonance caused by LC filter, an active damping strategy that does not cause additional energy loss utilized. The law devised from detailed, actively damped model....

In the study, we develop a method to improve accuracy of master-slave synchronization in EtherCAT networks. The involves two key compensations that are not considered protocol. First, propagation delay between master and reference slave is measured, system time then compensated for measured delay. Second, bias component error periodically estimated, each estimated component. entire implemented as part application without modifying protocol or requiring excessive computation load large memory...

We design a networked control system (NCS) where the communication between sensors and controllers takes place over wireless sensor network (WSN). In order to measure time delays in real time, we an algorithm round trip (RTT) WSN nodes, implement it into TinyOS of WSN. By using measured delays, construct Smith predictor compensate real-time. For experiment, simulate dynamic plant model, controller, interface Real-Time Windows Target provided MATLAB. The Simulink model consists serial ports,...

A dynamic model of surface-mounted permanent magnet synchronous motors (SPMSMs) is constructed to include the dead-time disturbance voltage voltage-source inverter and SPMSM parameter uncertainty. The reveals that both uncertainty degrade stator current control performance. Based on this notion, a nonlinear damping compensator designed simultaneously compensate for in unified structure. advantageous because it implemented with only static feedback available system variables low computational...

We investigate the global asymptotic stability of FAST TCP based on a continuous-time model for network in which all cross traffics, time-varying feedback delays, and queuing delay dynamics at link are taken into consideration. recognize dynamic interaction between source as interconnection two input-to-state stable(ISS) subsystems. Then, applying Razumikhin-type nonlinear small gain theorem, we prove that is inherently ISS globally asymptotically stable without any specific conditions...

In nowadays, CNC machines are capable of achieve nanoscale precision. Also, many researches being conducted in order to further improve the accuracy machined parts. On contrary, we focused on a machining platform with larger work space. this study, propose hexapod robot, which can move desired location and perform machining. This robot be viewed as combination robot. Its hardware design control algorithms will introduced paper.

A fault-tolerant levitation controller design method for Maglev(Magnetic Levitation) vehicle is presented. Even though designing a Maglev to make the steady suspension under some faults key technology in system, this hasn't well explored. The of occurred system will reduce running performance, disable whole operation and even bring about dangerous situation safety passengers. Therefore, developed cope with controller. FTLC duplex proposed principles are explained. feasibility verified...

We address the global asymptotic stability of FAST TCP, especially considering cross traffics, time-varying network feedback delay, and queuing delay dynamics at link. Exploiting inherent dynamic property we construct two sequences that represent lower upper bound variations congestion window in time. By showing converge to equilibrium point window, establish TCP itself is globally asymptotically stable without any specific conditions on tuning parameter α or update gain γ.

최근 심장질환으로 인한 사망률 증가로 심정지 환자의 생존율을 높이는 심폐소생술 훈련의 중요성이 대 두되고 있다. 본 논문에서는 YOLOv8n-Pose와 RepNet을 활용하여 심폐소생술의 적절한 흉부압박 자세와 속도를 피드백해 주는 교육 시스템을 제안하였다. 자세 교정을 위해 사람의 자세를 추정할 수 있는 YOLOv8n-Pose를 사 용하였으며, 성능 향상을 목적으로 이미지 데이터 수집 과정을 거쳐 파인튜닝을 수행하였다. 속도는 반복적인 동작의 횟수는 통해 판단하였다. 판정된 박자가 올바르지 않을 때 자막과 음 성, 두 가지 방식으로 피드백을 제공하도록 하였다. 제안한 시스템은 훈련 현장에서 학습자가 스스로 자가 학습을 하는데 활용될 있을 것으로 기대한다.

A robust backstepping controller with nonlinear damping is designed for the grid‐side converter (GSC) of a grid‐connected doubly fed induction generator (DFIG) in wind energy conversion systems (WECSs). The achieves exponential ultimate boundedness both DC‐link voltage and GSC current errors an arbitrarily fast decay rate small bound presence model uncertainties time‐varying external disturbances. desirable feature that distinguishes proposed from other existing controllers control input...

This paper presents a methodology that can be applied to perform non-parametric frequency response analysis of mechanical or robot systems. In the process performing analysis, method applying swept sine input stepped excitation is often used. Both these methods have advantages and disadvantages complemented by each other. this paper, we propose taking two methods. The proposed verified simulation it real system system.

This paper presents the optical-circuit-packet integrated switching system. It enables to unify optical transport network layer, circuit layer and packet into single platform. uses an converged technology, a unified control management technology. will solve problem such as explosion of traffic, lack transmission capacity. As result, it save cost build network.

Real-time industrial network performance is very critical affected by the jitter. EtherCAT one of powerful Ethernet base network. The dependent on master system. Many Industrial controllers use embedded OS, and some them has weakness real-time performance. This paper shows system computational delay side view.

For precision machining of a complex shaped object, Non-uniform rational B-spline (NURBS) interpolator is often preferred over conventional linear and circular interpolator. However, the use NURBS interpolators has been limited due to heavy required computational load feedrate fluctuation. This study focuses on suppression fluctuation as it would degrade quality machined objects. In this study, computationally efficient compensation algorithm proposed. The proposed predicts compensates in...

In this paper, optimized electromagnetic interference (EMI) design for the signal stability of servo drive board is proposed. With development electronics industry, performance has increased, and tolerance range reduced high precision required. Because power with miniaturization, there are many noises, unexpected phenomena along processing occur on circuit. Therefore, developers have difficulty in manufacture, so paper suggests EMI considered guideline developers. The electrical...