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In this paper, voltage and current waveforms were measured in order to analysis arc characteristics of low voltage wires used for indoor wiring of railway station. The simulated arc generator was made by UL 1699 and arc was simulated to series arc. And analyzed statistical distributions of the current and voltage waveforms for the source was used to analysis series arc source. Results of analysis...
As great attention has been paid to the Internet of Things (IoT), which allows objects to be sensed and controlled remotely, related research and standardization are being actively conducted. However, observing and controlling devices at a satisfactory level is still a challenging task. In our preliminary study, we proposed architecture that uses the user's smartphone as an IoT gateway. In this paper,...
Two-dimensional (2-D) time-space diagram have been widely used to analyze the flow of the traffic. However, it has limitations to make a plan that guarantees the collision avoidance of vehicles at the intersections. In this paper, we introduce the three-dimensional (3-D) time-space diagram and demonstrate its effectiveness in describing the movements of vehicles at the intersections. We also propose...
A path-following steering controller of automated lane change system with adaptive preview time is proposed in this paper. Model predictive control is employed to design the steering controller. A path geometry change (PGC) index is proposed to adjust the preview time of the controller. The PGC index is defined as the average of the absolute value of the double derivative of the target path in the...
This paper describes parameter adaptive steering control for autonomous driving. The proposed controller has been developed based on preview model of the upcoming road and on yaw rate gain which is yaw rate response to the front steering angle input. The yaw rate gain is dependent on vehicle velocity and understeering gradient. The proposed controller adapts the yaw rate gain and determine proper...
This paper represents model predictive steering control scheme for automated vehicle following system. In contrast to highway, there are some unexpected obstacles such as parked or oncoming vehicles on inner-city streets. Therefore, an automated vehicle following system should consider these obstacles as well as a leading vehicle to guarantee the safety of the system. The model predictive steering...
A lane keeping system using adaptive model predictive control with linear time-variant prediction model is proposed in this paper. First, real-time on-line system identification using recursive least square method is employed to obtain the estimated tire cornering stiffness of the bicycle model. The vehicle velocity within the prediction horizon is predicted using the longitudinal acceleration to...
During the early stages of bone wound healing, mesenchymal stem cells (MSCs) in the bone marrow migrate to an injury site and differentiate into osteoblasts, which actively participate in the bone repair process. We proposed that a biomaterial system which enhances migration of endogenous MSCs may accelerate the tissue healing process. The aims of this study were to 1) identify and characterize an...
A micro-viscometer for measuring viscosity changes in small amount of liquid in real time is designed and fabricated. The merits of the device are to use minimal liquid and to increase the sensitivity for measuring the viscosity. The micro-viscometer is composed of two chambers connected by several micro-channels. Each chamber has a unimorphic piezoelectric diaphragm for driving and sensing sound...
A model with three degrees of freedom is proposed as a means for controlling for controlling micro vibrations in semiconductor manufacturing. The model was derived from an assumption based on small and low frequency vibrations. The coordinates of the 3 DOF was composed of a vertical position, pitch, roll and a proof term. The coordinates of the 4 variables can be calculated from the 4 positions in...
Electronic control system has become increasingly popular in automotive applications in recent years, resulting in significant improvement on the vehicle performance. Chassis systems were made progress more stabile and higher dynamic performance by braking control, steering control and suspension control. Especially, ESC (electronic stability control) as an active safety technology assists the driver...
The performance of ESC system is greatly influenced by vehicle design factor and tire performance. But many car maker develop the vehicle can have variability to meet the variety consumer requirement of several countries. ESC system also should be developed with considering the chassis configuration of vehicle and being satisfied the requirement. So, robust control algorithm and value-added-function...
In this paper, we proposed a software architecture for operating an automatic semiconductor manufacturing machine. Nowadays, machines used for semiconductor processing require a high level of automation in the areas of motion control, machine vision, data acquisition and networking. These functions are assured by industrial equipment that is generally installed in a computer. This equipment occupies...
As the vehicle electronic control technology grows fast and becomes more sophisticated, a more efficient way than the traditional in-vehicle driving test is demanded for design, test, and tuning of electronic control units. For this purpose, HILS (hardware-in-the-loop simulation) scheme is very promising since significant portions of actual driving test procedures can be replaced by HIL simulation...
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