Jae-wook Jeon

Recently, Electrostrictive polymers (EPs) are studied for micro-actuator, because of similarity of body tissue. Electrostrictive polymers (EPs) are based on the deformation of dielectric elastomer polymer in the presence of an electric field. Modeling of electrostrictive polymer has been studied, which is about voltage and displacement. And there are many parameters such as Young's modulus, voltage, thickness of EPs, pre-strain, dielectric, frequency and temperature which effect to movement of E

Recent advances made in IT technology has given much impetus to the development of multimedia devices. The digital camera is such a multimedia device. It has made much progress and become very popular, as most people now own a digital camera or cell phone with camera features. People often take photographs in everyday life. Professional photographers often take photographs of travel destinations, banquet halls or parties. In this paper, we propose an autonomous robot photographer capable of taki

Image processing and analysis are active research topics. An intelligent vehicle and a service robot require these techniques. In particular, there is a big demand for line detection because it has a wide range of applications. The line features in an image are used for object identification, robot navigation, and intelligent vehicle control. To detect the lines, a Hough transform is generally used. The Hough transform has good detection results and it is robust to noise, but it takes a long tim

Fish-eye cameras have long been employed in traffic surveillance systems to allow for wider observation of the roads. Despite their widespread use, limited computer vision research is tailored explicitly to images captured by fish-eye cameras. The AI City Challenge 2024 - Track 4 introduces a novel fish-eye camera dataset for the 2D road object detection task. This paper proposes a framework designed to detect objects in fish-eye camera images. Our approach involves several key steps: first, we

A new biomemetic actuator is proposed. The actuator realizes bidirectional actuation since it is with a stretched film antagonistically configured with compliant electrodes. Also, it is distinguished from existing actuators with respect to the controllability of its compliance. Bidirectional actuation and compliance controllability are important characteristics for the artificial muscle actuator and the proposed one accomplishes these requirements without any mechanical substitute or complicated

In this paper, we present design and implementation of a New FAT file system (NFAT) for mobile multimedia devices. Conventional file system which has been used for personal computers is the FAT and it is still adopted for most of current portable devices. The major problem of the FAT is overhead due to cluster switching which involves retrieving and updating of cluster connection information saved on the file allocation table. Because of this overhead, response time of file read and write operat

Behaviors of nafion-based actuators are significantly affected by interfacial area between electrode and polymer electrolyte. Replication method was utilized to manufacture a large surface-area composite actuator. Etched aluminum foil was used as a template for replication using liquid nafion solution. Measurement of double layer charging and scanning electron microscopy indicated that interfacial area was greatly increased by replication method. Higher surface area induced a better bending perf

In previous works, the possibility of the electrostrictive polymer as the actuator use has been proved. In this paper we address an actual design of an actuator and an inchworm type robotic mechanism using the electrostrictive polymer. The robot will be developed to move horizontally, vertically with steering capability, aiming for navigation in small tubular structures such as flexible pipes but now in this stage a simple bellows type robot capable of accomplishing the linear movement like that

The method of automatically controlling exposure suggested in this paper can be divided into two stages: One is to construct a table storing values to establish an image sensor, and the other one is to control exposure by using the table created and actually establishing the sensor. To control exposure generally, it is possible to get an expected result by controlling analog/digital gains or exposure time. after constructing set values of the exposure control parameter, analog gains and exposure

The actuation of electrostrictive polymer (EP) actuator under electric field is known due to the electrostatic force between the parallel compliant electrodes on both sides of polymer film, which means the magnitude of electric potential between the electrodes is one of the determinative parameters of the actuation. The actuation is also dependent on the material properties such as dielectric constant and elastic modulus of polymers. In order to maximize the actuation behavior, high dielectric c

In this paper first we address experimental works to investigate basic characteristics of IPMC actuators which have not been discussed sufficiently yet. Surface conductivity, displacement and force features are discussed. Also a new actuator is proposed called Artificial Musclelike Linear Actuator (AMuLA) inspired from the actuation principles of the human. The actuator is a linear actuator simulating the mechanical behavior of myofilaments that are the basic units of the human muscle. Multiple

This study presents a lightweight deep learning model developed for DPU-accelerated systems. It aims to provide real-time autonomous driving on resource-constrained systems such as the Ultra96v2. A customized kids electric car served as the platform. Custom power supply and steering control systems were set up in the car to enable real-world testing. To enhance inference performance, various methods were used. These included input size reduction, channel-pruning, and quantization. As a consequen

Voice is one of the convenient methods for communicating between humans and robots. To command a lot of robot tasks by voice, voices of the same number have to be able to be recognized. But the more voices that have to be recognized, the higher the cost of recognition system is and the longer the time of recognition is. In this paper, a low cost voice recognition system which can distinguish a lot of robot tasks is proposed. The proposed system consists of a general purpose microprocessor and a

Electrostrictive polymers such as silicone, acrylic, and polyurethane can achieve large strain and stress with high electric field. This property can make electrostrictive polymers useful actuators. While there are some limitations in reducing existing actuators, there are few in electrostrictive polymer actuators. Therefore, an electrostrictive polymer can be used to design an actuator of a micro robot system. In this paper, an actuator system, which consists of an electrostrictive polymer actu

Electrical testing method is the most efficient and cost-effective method to determine whether semiconductor chips are defective. In the wafer state, an interface device called a probe card is needed to physically contact with the pad for electrical test. Recently, the environment for wafer test is getting more challenging. This is because of decrease in pad-size due to device shrinkage, and increase in the number of pins due to multi parallelism of a probe card. First of all, it is important to