메타버스 기반 상담 에이전트와 사용자의 자기노출에 대한 제언

이은성(Eunsung Lee),박윤정(Younjung Park),정민웅(Minwoong Chung),임인재(Injae Im),김소영(Soyoung Kim),이서진(Seojin Lee),이세영(Seyoung Lee),금희조(Heejo Keum) 한국HCI학회 2024 한국HCI학회 학술대회 Vol.2024 No.1

최근 정신건강의 악화가 주요 사회문제로 대두되면서 비대면 방식의 인공지능 정신건강 상담 에이전트의 필요성이 높아지고 있다. 정신건강 상담에 따른 효과를 극대화하기 위해서는 무엇보다 피상담자의 자기노출이 필수적이다. 하지만 그동안의 심리상담 자기노출에 관한 연구는 주로 대면 방식의 상담을 대상으로 이루어졌고, 인공지능 상담 에이전트에 관한 연구는 여전히 초기 단계에 머무르고 있다. 또한 인공지능 상담 에이전트 연구이더라도 대부분 텍스트화된 챗봇 형태로 진행되었으며, 몰입감이 높은 가상환경에서의 연구는 상대적으로 매우 적은 실정이다. 이에 따라 본 논문은 메타버스 환경 내 상담 에이전트와 사용자 간의 상호작용 속에서 사용자의 자기노출에 영향을 미치는 요소를 파악하고자 하였다. 구체적으로, 기존 선행 연구에서 대면 상담 중 자기노출을 높이기 위해 사용된 변수에 대한 분석을 진행하였다. 또한 메타벅스 환경에서 자기노출이 발현되는 상황이 텍스트 기반의 챗봇 에이전트를 향한 자기노출 상황과는 어떻게 다른지에 대해 살펴보았다. 이러한 분석을 바탕으로 본 연구는 메타버스 환경에서의 상담 에이전트를 실제 구현하였다. 본 논문은 피상담자의 자기노출을 높이기 위해서 가상환경에서의 인공지능 상담 에이전트가 향후 어떻게 디자인되고 발전되어야 하는지에 대한 시사점을 제공한다는 연구 의의가 있다.

Color Enhancement of Low Exposure Images using Histogram Specification and its Application to Color Shift Model-Based Refocusing

Lee, Eunsung,Kang, Wonseok,Kim, Sangjin The Institute of Electronics and Information Engin 2012 IEIE Transactions on Smart Processing & Computing Vol.1 No.1

An image obtained from a low light environment results in a low-exposure problem caused by non-ideal camera settings, i.e. aperture size and shutter speed. Of particular note, the multiple color-filter aperture (MCA) system inherently suffers from low-exposure problems and performance degradation in its image classification and registration processes due to its finite size of the apertures. In this context, this paper presents a novel method for the color enhancement of low-exposure images and its application to color shift model-based MCA system for image refocusing. Although various histogram equalization (HE) approaches have been proposed, they tend to distort the color information of the processed image due to the range limits of the histogram. The proposed color enhancement algorithm enhances the global brightness by analyzing the basic cause of the low-exposure phenomenon, and then compensates for the contrast degradation artifacts by using an adaptive histogram specification. We also apply the proposed algorithm to the preprocessing step of the refocusing technique in the MCA system to enhance the color image. The experimental results confirm that the proposed method can enhance the contrast of any low-exposure color image acquired by a conventional camera, and is suitable for commercial low-cost, high-quality imaging devices, such as consumer-grade camcorders, real-time 3D reconstruction systems, digital, and computational cameras.

Parameter Estimation for Multipath Error in GPS Dual Frequency Carrier Phase Measurements Using Unscented Kalman Filters

Eunsung Lee,Sebum Chun,Young Jae Lee,Teasam Kang,Gyu-In Jee,Jeongrae Kim 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.4

This paper describes a multipath estimation method for Global Positioning System (GPS) dual frequency carrier phase measurements. Multipath is a major error source in high precision GPS applications, i.e., carrier phase measurements for precise positioning and attitude determinations. In order to estimate and remove multi path at carrier phase measurements, an array GPS antenna system has been used. The known geometry between the antennas is used to estimate multi path parameters. Dual frequency carrier phase measurements increase the redundancy of measurements, so it can reduce the number of antennas. The unscented Kalman filter (UKF) is recently applied to many areas to overcome some of the limitations of the extended Kalman filter (EKF) such as weakness to severe nonlinearity. This paper uses the UKF for estimating multi path parameters. A series of simulations were performed with GPS antenna arrays located on a straight line with one reflector. The geometry information of the antenna array reduces the number of estimated multipath parameters from four to three. Both the EKF and the UKF are used as estimation algorithms and the results of the EKF and the UKF are compared. When the initial parameters are far from true parameters, the UKF shows better performance than the EKF.

About naked fluoride

Lee, Eunsung 대한방사성의약품학회 2018 Journal of radiopharmaceuticals and molecular prob Vol.4 No.2

Fluoride is one of most important atoms for both clinical and pharmaceutical usage. Associated with such a strong need, $^{18}F$-fluoride has been widely used as an essential radioisotope. The fluoride always suffers from strong solvation effects through strong hydrogen bonding, which reduce the reactivity of fluoride anion. To enhance the reactivity, the concept of naked fluoride was introduced in the fluorination field. In this essay, I will briefly describe the history of naked fluoride concept and development of naked fluoride sources.

A Study for Composition and Comparison of the Music Perception Tests for Normal Hearing and Cochlear Implant Users

Eunsung Lee,Yerim Shin,Sungmin Jo,Jinsook Kim 한국청각언어재활학회 2021 Audiology and Speech Research Vol.17 No.3

Purpose: The aim of this study was to compose the test for music perception and analyze the characteristic of cochlear implant users’ music perception. Methods: The test was made up with the pitch, melody, and timbre factors, using three low and high frequencies, six music genres, and four types of musical instruments correspondingly. The tests were conducted to 10 normal-hearing (NH) young adults and 10 young cochlear-implant (CI) users. Results: All the music perception tests showed significant differences between NH and CI group [F(1, 4) = 0.018, p = 0.019]. In the pitch test, CI group showed significantly lower correction rate(51.3%) than NH group (82.7%) did with higher correction rates in low frequencies. In the melody test, CI group showed significantly lower correction rate (29.7%) than NH group (95.8%) did with the highest performance in folk songs (51.7%). In the timbre test, CI group showed significantly reduced performance (22.5%) than NH group (65.8%) did. For both CI and NH groups, the pitched percussion showed the highest scores (45% and 100%) while the woodwind showed the lowest scores (13.3% and 48.3%). Conclusion: Out of three tests, CI group showed better performance in pitch perception than melody and timber perception. CI group showed better performances in low pitch sounds, melodies of familiar genre, and sound of pitched percussion instruments’ timber showing complicated music perception ability. To enhance the music perception ability for CI users by aural rehabilitation, more specified and systematic music perception test material should be developed.

Posttraumatic Growth in the Distribution of Negative Interpersonal Relationship: A Christian Perspective

LEE, Eunsung,CHOI, Choongik Korea Distribution Science Association 2021 유통과학연구 Vol.19 No.2

Purpose: This paper attempts to explore a Christian perspective on the process leading to growth after complex trauma caused by family violence experience. To achieve it, the article tackles the analysis of relationship between the inflictor father and victim, interpersonal relationship, and relationship with God in terms of growth after suffering from the trauma of family violence with a Christian perspective. Research design, data, and methodology: This study employed an in-depth interview as a methodology. Seven Christian adults who have experienced family violence in childhood are selected for the qualitative case study. 58 concepts, 24 low-level categories, and eight high-level categories are derived from each interview case. Results: The results of the case study show that the negative emotion caused by family violence during childhood is likely to lead to narcissistic rage. It is found that the reflection for posttraumatic growth starts with crying to God, simultaneously expressing pain and suffering. Conclusions: The interesting thing is that they are willing to forgive in the process of trauma therapy. It should be noted that the research results also demonstrate that relationship restoration entails the meaning reconstruction in the interpersonal relations.

New Grubbs Catalysts for Cyclic Polymer Synthesis

Eunsung Lee(이은성) 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.2

Antenna Placement Optimization for Distributed Antenna Systems

Eunsung Park,Sang-Rim Lee,Inkyu Lee IEEE 2012 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.11 No.7

<P>In this paper, we propose new algorithms to determine the antenna location for downlink distributed antenna systems (DASs) in single-cell and two-cell environments. We consider the composite fading channel which includes small and large scale fadings. First, for the single-cell DAS, we formulate the optimization problem of distributed antenna (DA) port locations by maximizing the lower bound of the expected signal to noise ratio (SNR). In comparison to the conventional algorithm based on the squared distance criterion which requires an iterative method, our problem generates a closed form solution. Next, for the two-cell DAS, we propose a gradient ascent algorithm which determines the optimum DA locations by maximizing the lower bound of the expected signal to leakage ratio (SLR). In our work, we consider selection transmission, maximal ratio transmission and zero-forcing beamforming (ZFBF) under sum power constraint and study equal gain transmission and scaled ZFBF under per-antenna power constraint. Simulation results show that our proposed algorithms based on both the SNR and the SLR criteria offer a capacity gain over the conventional centralized antenna systems.</P>

부정적 정서 유통에 따른 대인관계 문제의 영성효과: 트라우마를 중심으로

Eunsung LEE,Choong-Ik Choi 한국유통과학회 2019 유통과학연구 Vol.17 No.5

Purpose - This paper aims to examine a spirituality’s impact on the posttraumatic interpersonal relationships of family violence with a structural equation model(SEM). This article starts with the research idea that family violence experience bring about negative emotion in terms of interpersonal relationship leading to the distribution of negative affect in social relationship. The research question of this study pinpoints on how family violence experience affects interpersonal relationship problems and how spirituality affects interpersonal relations problems. Based on the idea, we attempts to deal with spirituality’s impact as a driving factor of transforming the distribution of negative affect. Research design, data, and methodology – The structural equation modelling(SEM) is employed as a analysis method of this study. SEM provides a chiefly cross-sectional statistical modelling method, and moreover it allows multiple variables to be associated with a latent variable in this analysis. 300 samples from Seoul, Gyeonggy and Gangwon are selected in the survey. We chose available 271 among them. Results – The results verify that trauma have placed an negative impact on personal relations. The study results also shows that the more serious get the degree of family violence trauma, the worse become interpersonal relationship problems. What is more interesting is that the degree of trauma’s impact on interpersonal relation problems in male is higher than that of trauma’s impact in female. It is mainly attributed to the fact that women are superior to men in terms of empathy ability and interpersonal relationship orientation. It can be noted that the well-managed spirituality will be able to make a great contribution towards reducing the degree of trauma caused by interpersonal relationships. Conclusions – The study results demonstrates that family violence have negative impacts on spirituality, while spirituality have an positive impacts on reduction the problems of interpersonal relationship. It has been found out that family violence trauma may cause negative affectivity in personal relations, which can distribute negative impacts regarding interpersonal relationship in society. This study also supports that spirituality will be able to function well as a helper, which may reduce the distribution of negative affect in society.

Color shift model-based image enhancement for digital multifocusing based on a multiple color-filter aperture camera

Lee, Eunsung,Kang, Wonseok,Kim, Sangjin,Paik, Joonki IEEE 2010 IEEE transactions on consumer electronics Vol.56 No.2

<P>In this paper, we present a novel image enhancement approach using a color shift model-based multiple color-filter aperture (MCA) camera for digital multifocusing. The proposed image enhancement algorithm consists of three steps; (i) cluster-based region-of-interest (ROI) estimation, (ii) image registration using phase correlation matching (PCM) and fusion, and (iii) image enhancement using spatially adaptive noise smoothing based on the alpha map. The image acquired by the MCA configuration contains color misalignment, which provides additional depth information of objects at different distances. This color misalignment can also provide additional information for blur estimation. The proposed cluster-based image segmentation method can effectively classify ROIs according to the distance from the camera. The segmented regions are aligned by using PCM, and they are fused to generate an in-focused image. For further enhancement of the color-registered image, we use spatially adaptive noise smoothing based on the alpha map. Experimental results show the proposed image enhancement method can significantly enhance the visual quality of the MCA output image, and can be fully or partially incorporated into multifocusing or extended depth of field (EDoF) systems in the form of the finite impulse response (FIR) filter structure.</P>