Jinung An

Jinung An
Daegu Gyeongbuk Institute of Science and Technology | DGIST · Department of Interdisciplinary Engineering

Doctor of Philosophy

About

169
Publications
8,736
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1,258
Citations

Publications

Publications (169)
Article
Full-text available
Nurses with rotating shifts, including night shifts, have suffered from low physical activity during the COVID-19 pandemic and lower sleep quality due to the disruption of their circadian rhythm. This study aimed to develop and examine the effectiveness of a mobile wellness program on daily steps, sleep quality, exercise self-efficacy, intrinsic mo...
Article
Background Parkinson’s disease (PD) leads to impaired mobility and limited independence. Objective We investigated the effects of acupuncture on gait disturbance and analyzed hemodynamic changes caused by acupuncture in the cerebral cortex of patients with PD. Methods Participants (n = 26) with gait disturbance due to PD were randomly assigned to...
Article
Full-text available
Hemispheric asymmetry in hand preference for passive cutaneous perception compared to active haptic perception is not well known. A functional near-infrared spectroscopy was used to evaluate the laterality of cortical facilitation when 31 normal right-handed participants were involved in 205 Hz passive vibrotactile cutaneous stimuli on their index...
Article
Full-text available
The human brain is lateralized to dominant or non-dominant hemispheres, and controlled through large-scale neural networks between correlated cortical regions. Recently, many neuroimaging studies have been conducted to examine the origin of brain lateralization, but this is still unclear. In this study, we examined the differences in brain activati...
Article
This paper details the design of a special end effector that allows a first aid robot to quickly and accurately give an injection. There is growing demand for robots that can perform rescue operations on behalf of rescue workers in dangerous areas such as disasters or wars. The robots are primarily responsible for searching and transporting the inj...
Article
Full-text available
In this paper, a new motion artifact correction method is proposed based on multi-channel functional near-infrared spectroscopy (fNIRS) signals. Recently, wavelet transform and hemodynamic response function-based algorithms were proposed as methods of denoising and detrending fNIRS signals. However, these techniques cannot achieve impressive perfor...
Article
Full-text available
The purpose of this study is to investigate cerebral cortex activation during active movement and passive movement by using a functional near-infrared spectroscopy (fNIRS). Tasks were the flexion/extension of the right hand finger by active movement and passive movement. Oxy-hemoglobin concentration changes calculated from fNIRS and analyzed the ac...
Article
Full-text available
Most research on the relationship between driver fatigue, driving comfort, stability and other factors related to driving has consisted subjective assessments via surveys. Bio-signal measurements allow more objective evaluations but the measurement processes and types are very complicated, and measurement signals are sensitive to noise. To address...
Article
Full-text available
Functional near infrared spectroscopy can measure hemodynamic signals, and the results are similar to functional magnetic resonance imaging of blood-oxygen-level-dependent signals. Thus, functional near infrared spectroscopy can be employed to investigate brain activity by measuring the absorption of near infrared light through an intact skull. Rec...
Conference Paper
Full-text available
Onerous life of paralyzed people is a substantial problem of the world society and improving their life quality would be a great achievement. This paper proposes a solution in this regard based on telepresence, where a patient perceives and interacts with a world through an embodiment of a robot controlled by a Brain-Computer Interface (BCI) system...
Article
Functional near-infrared spectroscopy (fNIRS) as a brain imaging technique is getting more and more interested in spite of its lower spatial resolution compared to functional magnetic resonance image (fMRI). Especially, fNIRS is gradually spread out in investigating the cortical activity of motion related tasks, because of its advantages of robustn...
Article
Full-text available
A functional near-infrared spectroscopy (fNIRS) can be employed to investigate brain activation by measuring the absorption of near-infrared light through the intact skull. The general linear model (GLM) as a standard model for fMRI analysis has been applied to functional near-infrared spectroscopic (fNIRS) imaging analysis as well. The GLM has dra...
Article
As more robotic technology has been developed and implemented for rehabilitation training, the conventional rehabilitation methodology is expected to change and to have various functional modes other than Continuous Passive Movement (CPM). In this paper, the multifunctional training that are expected for the rehabilitation robot to provide is intro...
Conference Paper
The general linear model (GLM) as a standard model for fMRI analysis has been applied to functional near-infrared spectroscopic (fNIRS) imaging analysis as well. The GLM has drawback of failure in fNIRS signals, when they have drift globally. Wavelet based de-trending technique is very popular to correct the baseline drift (BD) in fNIRS. However, t...
Article
The integration of Brain-Computer-Interfaces (BCI) into rehabilitation research is a promising approach that may substantially impact the rehabilitation success. Yet, there is still significant challenges that needs to be addressed before the BCI technology can be fully used effectively in a clinical setting as a neural prosthesis for motor impaire...
Conference Paper
Near-Infrared spectroscopy (NIRS) is an emerging non-invasive brain computer interface (BCI) modality that measures changes in haemoglobin concentrations in the cortical tissue. To date most NIRS studies have used standard multiple subject/session dependent classifiers for neural signal decoding. Such approach is preferable to avoid large degree of...
Article
Operating swarm robots has the virtues of improved performance, fault tolerance, distributed sensing, and so on. The problem is, high overall system costs are the main barrier in managing a system of foraging swarm robots. Moreover, its control algorithm should be scalable and reliable as the foraging (search) spaces become wider. This paper analyz...
Article
This paper dealt with a pincers-type gripper being able to grip a heavy-weighted cylindrical object having various size with itself. This gripper should be designed to seize the objects without any change of jaw shape. Grasping achieved equilibrium after the object slipped on the jaw while grasping it. To cope with this situation, we suggested the...
Patent
Provided are a rehabilitation training system and method that provide active rehabilitation training to a patient requiring rehabilitation treatment. The rehabilitation training system and method provide rehabilitation-related information to the patient to provoke a rehabilitation intent of the patient, and continuously measure a biological sign...
Conference Paper
In this paper, we tried to suggest feature extraction method using CSP Algorithm to improve the accuracy of classifier according to finger movement to develop the Upper Limb Rehabilitation Robot System based on brain signal. Four subjects participated in the experiment and they conducted four kind of tasks in three times. The task is divided by two...
Conference Paper
Despite of the findings that motor imagery and motor execution are supposed to share common neural networks, previous studies using motor imagery based rehabilitation have revealed inconsistent results. In this study, we implemented a real-time neuro-feedback system based on near infrared spectroscopy (NIRS), and investigate the effect of neuro-fee...
Conference Paper
Functional near-infrared spectroscopy (fNIRS) has become an established tool to investigate brain function and it is an interesting modality for brain computer interfaces (BCIs). This paper was aimed at examining whether fNIRS can be an appropriate BCIs modality. Brain activities of three subjects performing a right-hand finger movement (flex and e...
Article
Recently, many researchers have studied in engineering approach to brain activity pattern of conceptual activities of the brain. In this paper we proposed a intension recognition framework (i.e. classification system) for high accuracy which is based on Fuzzy-Rough Feature Selection and Multitree Genetic Programming. The enormous brain signal data...
Article
The broadband design of a microstrip patch antenna is presented and experimentally studied for multi-robot cooperation. A parasitic mushroom-like metamaterial (MTM) patch close to a microstrip top patch is excited through gap-coupling, thereby producing a resonance frequency. Because of the design, the resonance frequency of the parasitic MTM patch...
Article
This paper proposes a sensor, which is capable of determining the type of dust through the dust detection sensor system that uses infrared sensor. Recently, cleaning robot is highly favored in the service robot market, which has been lead to development in various fields. Researches including navigation, localization, and developing the key compone...
Article
Full-text available
Tracking system is essential for Image Guided Surgery(IGS). The Optical Tracking Sensor(OTS) has been widely used as tracking system for IGS due to its high accuracy and easy usage. However, OTS has a limit that tracking fails when occlusion of marker occurs. In this paper, sensor fusion with OTS and Inertial Measurement Unit(IMU) is proposed to so...
Conference Paper
Recently, a functional near-infrared spectroscopy (fNIRS) is frequently reported optical brain imaging method from the standpoint of clinical feasibility. This paper was aimed at examining whether fNIRS can be an appropriate brain imaging modality for checking the progress of rehabilitation treatments or not. Two healthy adults performed the given...
Article
A functional near-infrared spectroscopy (fNIRS)-which is a non-invasive modality to measure hemodynamics of cortices-is today the frequently reported optical brain imaging method comparing with fMRI from the standpoint of clinical feasibility. The aim of this study was to explore the experience of fNIRS in several motor executions which cannot be i...
Article
In the design of upper limb rehabilitation robots, critical issues to be considered are large workspace with minimum singularities to cover enough patients' upper limb range of motion and higher manipulability for the patients to easily and freely move their arm with applying almost the same force to every direction in a given posture. This paper p...
Article
A brain–computer interface (BCI) is a way of translating an individuals’ thoughts to control a computer or an external mechanical device. Studying brain activities in a reproducible manner, this study explores the possibility of using real-time functional-near infrared spectroscopy (fNIRS) to detect brain hemodynamic features for BCI commands. Sixt...
Conference Paper
In this paper, an enhanced tactile sensor is presented which improve sensing accuracy in Minimally Invasive Robotic Surgery (MIRS). Even though many types of tactile sensors have been designed, the detection of abnormal tissue is still not accurate during MIRS. Previous research results showed that a resistive type tactile sensor satisfies requirem...
Article
A robot end-effector or gripper must have the capability to endure both the weight and acceleration of the object in spite of its frequent movement while a robot uses the gripper to handle various objects and assists the tasks of a person. In this regard, it is essential to directly measure the amounts of gripping force and torque applied to the ob...
Article
In this paper, a new evolutionary approach to recommender systems is presented. The aim of this work is to develop a new recommendation method that effectively adapts and immediately responds to the user's preference. To this end, content-based filtering is judiciously utilized in conjunction with interactive evolutionary computation (IEC). Specifi...
Conference Paper
This study is to observe the cortical activation pattern by fNIRS and fMRI during grasping in patient with TBI. PMA, SMA, M1, and S1 were focused on the analysis of cortical activations. The measured BOLD and HbR signals were t-statistically analyzed using SPM and NIRS-SPM, respectively. The results showed that contralateral M1 and SM1 were mainly...
Chapter
Ensemble learning is one of the successful methods to construct a classification system. Many researchers have been interested in the method for improving the classification accuracy. In this paper, we proposed an ensemble classification system based on multitree genetic programming for intension pattern recognition using BCI. The multitree genetic...
Article
The aim of this study was to determine how the violinist robot could produce a good quality of violin sounds. We began our study with the basic physics of producing sound with a violin. We found three parameters that influenced the quality of the sound produced by the violin; the bowing force, the bowing velocity and the sounding point. In particul...
Patent
Provided is a self-directed rehabilitation training method for providing rehabilitation exercise to a patient needing requiring the rehabilitation according to a will of the patient, which is a rehabilitation training method for providing rehabilitation intention inducing environment to the patient, measuring the state of the patient, and providing...
Conference Paper
In this paper, we propose a multi-robot collaborative localization strategy for a group of mobile robots to enhance their formation-control and navigation performance even when the robots share only limited navigation information during indoor, multi-robot service applications.
Conference Paper
This paper presents a formation-control method based on virtual-space configuration for multi-robot, collective navigation. To maintain the configuration of a multiple-robot formation, each robot creates a virtual space composed of virtual robots around it, so that it can avoid collisions with, and keep a constant distance from, the other robots. I...
Article
This paper presents a new genetic programming (GP) approach to accurately classifying cognitive tasks from non-stationary and noisy fNIRS neural signals. To this end, a new GP that effectively handles multiclass problems is developed. In accordance with multi-tree structure, GP operators are innovated: crossover exchanges every subtree of parents w...
Article
Brain signal variation across different subjects and sessions significantly impairs the accuracy of most brain-computer interface (BCI) systems. Herein, we present a classification algorithm that minimizes such variation, using linear programming support-vector machines (LP-SVM) and their extension to multiple kernel learning methods. The minimizat...
Article
Full-text available
This paper presents a study in task-oriented approach to stroke rehabilitation by controlling a haptic device via near-infrared spectroscopy-based brain-computer interface (BCI). The task is to command the haptic device to move in opposing directions of leftward and rightward movement. Our study consists of data acquisition, signal preprocessing, a...
Conference Paper
Passive movement, action observation and motor imagery as well as motor execution have been suggested to facilitate the motor function of human brain. The purpose of this study is to investigate the cortical activation patterns of these four modes using a functional near-infrared spectroscopy (fNIRS) system. Seven healthy volunteers underwent optic...
Conference Paper
Operating swarm robots has the virtues of improved performance, fault tolerance, distributed sensing, and so on. Although, high overall system cost is the main barrier in managing a system of foraging swarm robots. Moreover, its control algorithm should be scalable and reliable as the foraging (search) spaces become wider. This paper analyzes a nat...
Article
In this chapter, we suggest a new information space concept called smart floor. It is the floor storage of specific information designed for route guidance of a mobile robot. A mobile robot can reach its goal position using the information saved in smart floor as well as automatically update the information for a changing environment. We constructe...
Conference Paper
This study showed an example of neurohaptic interface which can be the direct connector between haptics and brain. We investigated the neural activities of motion which are essential tasks for haptic interaction. Eating was adopted to explore the neural activities from the functional near-infrared spectroscopy (fNIRS) imaging. Subjects carried out...
Article
Full-text available
In recent days, self-assembling swarm robots have been studied by a number of researchers due to their advantages such as high efficiency, stability, and scalability. However, there are still critical issues in applying them to practical problems in the real world. The main objective of this study is to develop a novel self-assembling swarm robot a...
Article
Full-text available
Adaptation of control parameters, such as scaling factor (F), crossover rate (CR), and population size (NP), appropriately is one of the major problems of Differential Evolution (DE) literature. Well-designed adaptive or self-adaptive parameter control method can highly improve the performance of DE. Although there are many suggestions for adapting...
Article
The arm of robot consists of a manipulator and an end-effector. The end-effector is doing a specific work such as welding, picking and placing, sawing, deburring, suction, etc. with for the specific object of robot system. Here we are focused on the gripper among end-effectors. If the gripper generates the excessive gripping force, then the gripped...
Conference Paper
Recently, it has been researched to adopt the dual arm robot at the packaging and assembly line of an electric device such as a mobile phone. At the research area of the end-effector development, it is necessary to extract demanded functions and to allocate these functions to allowable numbers of end-of-arm-tool (EOAT). On allocating steps, it is o...
Conference Paper
In the field of robotics, force-torque sensors are usually used to control multi-axial force-torque. The performance of force-torque sensors depends on the elastic structure, which serves as a sensor frame, and the sensitivity of the strain gauge. To ensure better performance of force-torque sensors, the transducer should be comprised of an elastic...
Conference Paper
It is necessary for the special service robot to have some parts of autonomous mobility which include local path planning, obstacle detection and avoidance. This work focuses on navigation strategy to overcome rough terrains for the miniature wheel-track hybrid mobile robot platform developed in the previous work. The navigation strategy describes...
Conference Paper
In order for a robot to handle various objects and perform or assist the tasks of a person, the robot has to be similar to the hand of a human and manipulation tools with the same functions were necessary. To properly perform such object manipulation functions, research and development of manipulation tools with integrated sensor technology utilizi...
Conference Paper
End effectors are disposed in the end of the manipulator. And the end effectors do physical contact with target materials for doing assigned and required tasks. On the analysis of requirements for assigned tasks, there is one gripper should handle the solid material and soft material together. In the pick and place task, it is better to do suctions...
Conference Paper
Using BCI technologies in neural rehabilitation, we can substantially improve hundreds of lives of people after stroke with more effective rehabilitation in restoration of their motor control. In this study, we demonstrate a neuro-rehabilitation framework which integrates BCI and a robot device to provide an active upper limb physical therapy. Our...
Conference Paper
Generally, rehabilitated patients can generate a motion through therapists or special devices. On the view of patients, these devices are a passive motion generator. Therefore we define the devices as a passive type. Most passive type devices for an upper limbs' rehabilitation have the structure of manipulator. As is well-known, this manipulator ty...
Article
This paper presents a terrain-adaptive wheel-track hybrid robot that uses a pair of combined wheel and track systems. The hybrid mobile platform can change the shape of track to adapt to various terrains so that it is able to move fast on flat terrain and to show good performance in overcoming stairs or obstacles. The proposed platform consists of...
Conference Paper
This research proposes a method which can be applied into location recognition of mobile robots using patterns and the numbers of recognized tags. As passive RFID tags can only measure existence of tags that are located in a recognizable range of a RFID reader, the physical position of each tag cannot be measured; thus, in order to receive informat...
Conference Paper
It is important to design gripper jaws and tips which contact with the handled part, for a proper conduction of a given mission of robot systems. Especially, it should be also considered to use what kind of sensors and degree of freedoms in gripper systems. If the tip of gripper has the force and torque sensor, it is possible to measure the value o...
Article
In photovoltaic system, the characteristics of photovoltaic module such as open circuit voltage and short circuit current will be changed because of cell temperature and solar radiation. Therefore, the boost converter of a PV system connects between the output of photovoltaic system and DC link capacitor of grid connected inverter as controlling du...
Article
This paper presents a design and simulation of bi-directional DC/DC boost converter for a fuel cell system. In this paper, we analyze the equivalent model of both a boost converter and a buck converter. Also we propose the controller of bi-directional DC-DC converter, which has buck mode of charging a capacitor and boost mode of discharging a capac...
Conference Paper
Full-text available
This paper presents a miniature haptic actuator based on MR fluids, designed to convey realistic haptic information to users in portable electronic devices. Named as a kinaesthetic actuator, the proposed haptic actuator can convey various kinaesthetic sensations. Humans generally rub (tactile) and press (kinaesthetic) target objects when they try t...