다트 던지기 기법을 사용한 개선된 격자구조 샘플링

고지은(Jieun Ko),이성길(Sungkil Lee) Korean Institute of Information Scientists and Eng 2021 정보과학회논문지 Vol.48 No.5

This paper presents a stratified sampling technique in which sampling areas are chosen through the dart-throwing technique. Stochastic sampling techniques, which are used in various fields such as image processing and computer graphics, produce images of high quality as samples distribute uniformly and randomly. The blue-noise pattern removes low-frequency areas that are critical in the aliasing problem, but computing such a pattern is costly. To address this issue, stratified sampling methods have been proposed; however, the method demonstrates low randomness due to the structure. This paper proposes a technique to increase randomness by determining the sampling area in the stratified structure through the dart-throwing technique. Our method randomly samples areas in which samples are jittered.

가상현실기반 운동프로그램이 뇌성마비 청소년의 대동작기능 및 균형에 미치는 영향

고지은 ( Ko Ji-eun ),이효정 ( Lee Hyo-jeong ) 대구대학교 특수교육재활과학연구소 2017 특수교육재활과학연구 Vol.56 No.2

본 연구에서는 뇌성마비 청소년에게 가상현실기반 운동프로그램을 적용하여 대동작기능 및 균형에 미치는 영향을 평가하고 효과를 분석해 보고자 하였다. 9∼18세의 뇌성마비 청소년 20명을 대상으로 하였으며, 모든 대상자는 GMFCS Ⅰ∼Ⅱ단계, CFCS 1∼2단계로 가상현실기반 운동프로그램을 적용한 실험군 10명과 신경발달치료를 적용한 대조군 10명으로 나누어 무작위 배정 하였다. 하루 40분, 주 2회, 총 6주 간의 중재를 하였고, 중재 전, 후에 대동작 기능과 균형을 측정하였다. 실험군과 대조군 대상자의 성별, 나이, 뇌성마비 유형 및 기능수준에는 유의차가 나타나지 않는 동질한 집단이었다. 측정값의 전후 비교에서 실험군과 대조군 모두 대동작기능과 균형에 향상이 있었다. 두 군 간의 비교에서는 실험군이 대조군보다 기기와 무릎서기를 제외한 대동작기능 점수, 아동균형척도 점수, 눈을 감은 상태에서의 압력중심점의 동요거리, 눈을 감은 상태에서의 압력중심점의 동요면적의 측정값에서 더 큰 향상을 보였다. 본 연구를 바탕으로 다양한 유형 및 기능수준을 가진 뇌성마비 청소년들에게 가상현실기반 운동프로그램을 적용하고, 더 많은 수의 대상자에게 적용하는 등 지속적인 연구가 필요할 것으로 사료된다. The purpose of this study was to determine if a exercise using virtual reality can improve gross motor function and balance in adolescents with cerebral palsy. 20 adolescents with cerebral palsy were randomly recruited and divided into two groups (experimental group = exercise based on virtual reality, control group = neurodevelopmental therapy). The subjects in each group is participated in the training for 6 weeks, 2 times per week, 40 minutes per session. GMFM-88 were measured for gross motor function; pediatric balance scale(PBS), sway length(SL) and sway area(SA) of center of pressure, limit of stability(LOS) were measured for balance before and after the training. The results of this study are as follows. First, GMFM-88 values in the experimental group and control group were significantly increased after training than before training. In the experimental group, sum of five GMFM dimensions(p<.01), GMFM-C(p < .05), GMFM-D(p < .01), GMFM-E(p < .01) ware significantly increased. and in the control group, sum of five GMFM dimensions(p < .01), GMFM-C(p < .05), GMFM-D(p < .05), GMFM-E(p < .05) ware significantly increased. After training, sum of five GMFM dimensions, GMFM-D, GMFM-E of the experimental group significantly decreased greater than that of the control group(p < .01). In the GMFM-C, significant differences between the groups did not observed(p > .05). Second, PBS scores in the experimental group and control group were significantly increased after training than before training(p < .01). After training, PBS scores of the experimental group significantly increased greater than that of the control group(p < .01). Third, SL values in the experimental group and control group were significantly decreased after training than before training. in the experimental group, values of SLEO and SLEC ware significantly decreased(p < .01). and in the control group, values of SLEO(p < .05) and SLEC(p < .01) ware significantly decreased. After training, SLEC values of the experimental group significantly decreased greater than that of the control group(p< .05). In the SLEO, significant differences between the groups did not observed(p > .05). Fourth, SAEC values in the experimental group(p < .01) and control group(p < .05) were significantly decreased after training than before training(p < .01). After training, SAEC values of the experimental group significantly decreased greater than that of the control group(p < .01). In the SAEO, significant differences inter the groups and between the groups did not observed(p > .05). Fifth, LOS-reward(p < .05) and LOS-sum(p < .01) values in the experimental group and control group were significantly increased after training than before training. In the LOS-forward, LOS-rightward and LOS-leftward, significant differences did not observed between before and after training(p > .05). After training, in all directions, significant differences between the groups did not observed(p > .05) The study suggests that the exercise using virtual reality is an intervention method that improves gross motor function and balance of the adolescent with cerebral palsy.

[박사학위논문소개] 자율협력주행을 위한 차량 내 경고정보 시스템 설계 및 평가 기법 개발

고지은(KO, Jieun) 대한교통학회 2024 교통 기술과 정책 Vol.21 No.1

환경과 어학능력점수에 따른 한국 성인 학습자들의 영어불안감 양상

고지은(Jieun Ko),최윤덕(YunDeok Choi),이혜문(Haemoon Lee) 한국응용언어학회 2020 응용 언어학 Vol.36 No.4

This paper presents the unique patterns of anxiety observed in adult Korean English as a Foreign Language (EFL) learners. Through the survey consisting of 40 questions, 135 participants’ anxiety about EFL was examined in relation to the English-using environment -both inside and outside of the classroom-and TOEIC scores. The statistical analysis showed that there was no significant difference in anxiety depending on the English using environment. However, unlike previous research, participants with higher test scores tended to show higher levels of anxiety than those with lower test scores, and the effect of the test scores on anxiety was significant. In addition, there was no significant interaction effect between the English using environment and the test scores on anxiety. The concluding discussions include that the Korean learners’ goal for high proficiency test scores led to their conscious processing of their declarative knowledge or self-monitoring in all types of English environments, which in turn led to high levels of anxiety as their explicit and conscious knowledge increased up to the proficiency test score level expected by society.

10주간의 하타 및 라자 복합요가 프로그램이 중년 여성의 스트레스 관련 변인에 미치는 영향

고지은(Ko, Ji-Eun),강창균(Kang, Chang-Kyun),이만균(Lee, Man-Gyoon) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.1

The purpose of the study was to examine the effects of a 10-week combined program of Hatha and Raja yoga on stress-related variables in middle-aged women. Twenty middle-aged women were volunteered to participate in this study as subjects, and they were randomly assigned to either yoga group (YOGA: 10) or control group (CON: 10). The subjects in YOGA undertook the combined program of Hatha and Raja yoga for 60 min/session, three times per week for 10 weeks. The subjects in CON were asked not to change their normal life style during the intervention period. Several variables related to body composition, stress level, and cardiovascular function as well as stress-related blood variables were measured and compared between pre test and post test in two groups. Main results of the study were as follow: 1) There were not any significant changes in body composition-related variables in YOGA. 2) Stress level decreased significantly in YOGA. 3) Resting heart rate, diastolic blood pressure, and mean arterial pressure decreased significantly in YOGA. 4) Cortisol and glucose decreased significantly in YOGA. These finding suggested that 10 weeks of combined program of Hatha and Raja yoga would have positive effect on stress relief. The effect would have possible due to the reduction of cortisol, resting heart rate, and blood pressure as well as enhancement of insulin resistance.

GPU 기반의 병렬화된 점진적 지터드 샘플링

고지은(Jieun Ko),정효진(Hyojin Jung),이성길(Sungkil Lee) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.12

객체 탐지 및 빔 서치를 이용한 영상 주석 환각 해결

고지은(Jieun Ko),정승준(Seungjun Jung),김창익(Changick Kim) 한국방송·미디어공학회 2019 한국방송공학회 학술발표대회 논문집 Vol.2019 No.6

그래프 합성곱 신경망을 이용한 세부 이미지 분류

고지은(Jieun Ko),양승한(Seunghan Yang),김창익(Changick Kim) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.11

다트 던지기 기법을 사용한 개선된 격자구조 샘플링

고지은(Jieun Ko),이성길(Sungkil Lee) 한국정보과학회 2020 한국정보과학회 학술발표논문집 Vol.2020 No.7

준공영제에 따른 버스운영효율성 분석에 대한 국내연구결과 비교분석

고지은(KO, Ji Eun),김영하(KIM, Young Ha),강경우(KANG, Kyoung Woo) 대한교통학회 2017 대한교통학회 학술대회지 Vol.77 No.-

본 연구는 한국연구재단의 이공학 개인기초연구지원사업의 지원으로 수행되었다. 본 연구는 버스교통사고와 버스운영기관의 비용효율성의 구조적 분석연구를 위한 과정으로 수행되었다. 2004년부터 국내 주요 대도시에서는 안정적 시내버스 서비스 공급을 위해 버스준공영제를 실시하였다. 또한 경기도는 광역버스를 대상으로 운전자 근로여건 개선과 운행환경을 안전화를 위해 2017년 12월 이후 준공영제를 도입할 계획이고 이를 점차 시내버스까지 확장할 계획이다. 버스운송회사에 대한 효율성 분석 연구는 국내외적으로 많이 수행되었으며, 버스노선의 효율성분석은 노선을 정비· 개편하고, 효율성에 따른 교통정책을 재설정하는데 있어 중요하다.(양철수, 2012) 따라서 본 연구에서는 선행연구를 리뷰 및 정리하였으며, 앞으로 버스운송시장의 효율성 분석에서 이용할 수 있는 기초자료를 제시하고자 한다.