저온소성 TiO₂ 페이스트를 이용한 염료감응 태양전지의 특성 연구

정유라,구할본,Jung, You-Ra,Jin, En Mei,Gu, Hal-Bon 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.5

In this paper, we have developed a low temperature process to make two type of paste by using $TiO_2$ nanoparticles(P25). The interconnections between substrate and $TiO_2$ films or link between particles of free-binder paste(FP1, FP2, FP3) is very poor. Therefore, the Titanium(IV) isopropoxide was added to the TP paste to improve the interconnection. Electron transport time (${\tau}_t$) and recombination time (${\tau}_r$) are analyzed by IMPS (intensity-modulated photocurrent spectroscopy) and IMVS(Intensity-modulated photovoltage spectroscopy). In the results, ${\tau}_t$ of TP paste based DSSCs (about $4.3{\times}10^{-3}$) is faster than other samples. ${\tau}_r$ is longer from $2.7{\times}10^{-2}$ s of FP2 to $3.0{\times}10^{-2}$ s of TP. A solar conversion efficiency (DSSCs) of TP is 3.54% for an incident solar energy of 100 mW $cm^{-2}$(meanwhile, 2.70% for DSSCs with FP2). The conversion efficiency is increased by 1.3 times.

TTIP를 이용한 저온소성용 TiO₂ 페이스트 최적화

정유라,구할본,Jung, You-Ra,Jin, En Mei,Gu, Hal-Bon 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.8

In this paper, the low-temperature sintering of $TiO_2$ is approached to solve the problem of high temperature sintering which decreases the interconnection between particles or between substrate and particle. $TiO_2$ paste is prepared with Titanium (IV) isopropoxide as the precursor material and calcinate at different conditions (low temperature). In the results, since the changing of temperature and time of sintering, crystalline phase do not change and the intensities of anatase, rutile phase are higher. At $110^{\circ}C$, 7 h sintering condition, crystalline size of anatase and rutile phase are the smallest which are 13.07 and 17.47 nm, respectively. In addition, the highest zeta potential is about 32.77 mV and the repulsive force increases thus leading to the best of the dispersion characteristics between $TiO_2$ particles. Futhermore, DSSCs at that condition exhibits the highest efficiency with the values of $V_{oc}$, $J_{sc}$, FF and ${\eta}$ are 0.69 V, $8.60mA\;cm^{-2}$, 67.93% and 4.06%, respectively.

특수학교 및 복지시설 구성원의 안전보건인식 관계 연구

정유라 ( You-ra Jung ),갈원모 ( Won-mo Gal ),김인식 ( In-sik Kim ),엄주란 ( Joo-ran Eom ) 대한설비관리학회 2020 대한설비관리학회지 Vol.25 No.4

Safety and health education to prevent industrial accidents is implemented so that workers in the workplace can work more safely and acquire safety and related knowledge, such as risk factors at the site, and develop their ability to respond to sudden situations. Despite the importance of preventing industrial accidents, safety and health education is always problematic due to its effectiveness and site dynamics. Recently, safety insensitivity remains and the problem of assessing the degree of safety education is pointed out. The occurrence of industrial accidents can cause great damage to individuals, organizations and regions of the affected parties, so more certain prevention should be made. The purpose of this study is to present a comparative analysis of the education status and perception of worker of special schools and welfare facilities on safety and health. Subject to the investigation are 24 heads of workers' institutions and safety managers currently working at some special schools and welfare facilities in Gyeonggi Province, and disabled and worker and heads and safety managers. The main methods of analysis were frequency, technical statistics, and difference tests to examine differences between groups of agency heads and safety managers. As a result of the main analysis, there are significant differences between the head of the agency and safety managers, the disabled and the trainee workers in the possibility of near misses accident probability implement participation. The head of the agency and safety managers were found to have significantly higher safety and health awareness of the possibility of near misses than the disabled and trainees Therefore, It was suggested that safety and health education should be regularly conducted in depth and systematic considering each site situation and members' careers.

스토리텔링을 통한 춤 이미지 형상화

정유라(Yoora JUNG) 한국콘텐츠학회 2017 한국콘텐츠학회 종합학술대회 논문집 Vol.2017 No.5

개인인증을 위한 뇌파의 재현성에 대한 분석

정유라(Yu-Ra Jung),장윤석(Yun-Seok Jang) 한국전자통신학회 2020 한국전자통신학회 논문지 Vol.15 No.3

본 논문에서는 개인인증 시 활용 가능한 EEG 신호의 주파수 대역을 확인하기 위하여 뇌파 측정을 통해 분석한 결과를 제시하였다. 시각 과제의 유무에 따라 개안 상태와 폐안 상태로 구분하여 뇌파를 측정하였으며, 이를 델타파, 세타파, 알파파, SMR파, 중간베타파, 베타파 및 감마파의 7종류의 주파수 대역으로 나누어 시간에 따른 파워의 변동이 가장 작은 주파수 대역을 관찰하였다. 본 논문의 결과에서는 개안 상태와 폐안 상태에서는 유의한 차이가 나타나지 않았으나, 인간의 집중과 관련한 SMR파 및 중간베타파가 시간에 따른 파워의 변동이 가장 작게 관찰되었기에 재현성이 높은 주파수 대역인 것으로 나타났다. In this paper, we presented the results of analysis through EEG measurement for the purpose of checking the frequency band of EEG signals that can be used for personal authentication. The measurement status was divided into the open-eye state and the closed-eye state depending on the presence or absence of an optical task. The data measured in the EEG experiments was divided into seven frequency bands : delta waves, theta waves, alpha waves, SMR waves, mid-beta waves, beta waves and gamma waves to identify the frequency band with the smallest power fluctuation over time. In our results, there was no significant difference between the open-eye state and the closed-eye state, and the SMR waves and mid-beta waves related to human concentration had the smallest fluctuation in power over time, and were a highly reproducible frequency band.

음악적 자극과 수학적 과제 유형과의 상관관계에 대한 뇌파분석

정유라(Yu-Ra Jung),장윤석(Yun-Seok Jang) 한국전자통신학회 2020 한국전자통신학회 논문지 Vol.15 No.4

본 논문에서는 수학적 과제 유형에 따라 음악적 자극이 인간에게 미치는 영향을 뇌파 측정을 통해 분석하였다. 음악적 자극은 선호 음악과 비선호 음악, 수학적 과제는 암기형과 절차형의 과제로 구분하여 실험을 수행하였다. 뇌파 실험에서 계측한 데이터를 인간의 집중과 관련이 있는 세타파, SMR파 및 중간베타파로 구분하여 상대 파워 스펙트럼 분석을 통해 비교하였다. 본 논문의 결과에서는 수학적 과제의 유형과 관계없이 음악적 자극이 주어진 상황 중 선호하는 음악이 주어졌을 때의 파워가 더 높게 관측되었고, 선호하는 음악이 무음악과 비선호 음악이 주어진 상황보다 과제 해결 시 긍정적인 정서 반응을 유발하는 것으로 나타났다. In this paper, we analyzed the effects of musical stimuli on humans in performing mathematical tasks through EEG measurements. The musical stimuli were divided into preferred music and non-preferred music, and mathematical tasks were divided into memorization task and procedure task. The data measured in the EEG experiments was divided into frequency bands of Theta, SMR, and Mid-beta because of the concentration. In our results, preferred music causes more positive emotional response than no music and non-preferred music regardless of the type of mathematical task.

음악적 자극에 의한 뇌 활성도의 통계적 해석

정유라(Yu-Ra Jung),장윤석(Yun-Seok Jang) 한국전자통신학회 2021 한국전자통신학회 논문지 Vol.16 No.1

본 논문에서는 학습 과제 수행 시 청각 자극이 뇌에 미치는 영향을 확인하기 위하여 뇌파 계측 실험을 통해 얻은 데이터로 분석한 결과를 제시하였다. 피험자가 수학적 과제를 해결하는 동안, 피험자의 선호도에 따라 구분한 선호 음악 및 비선호 음악을 청각 자극으로 제시하였으며, 수학적 과제는 암기형 및 절차형 과제로 구분하여 뇌파를 측정하였다. 이를 집중력과 관련된 뇌파의 주파수 대역인 세타파, SMR파 및 중간베타파로 나누어 상대 파워 스펙트럼 값을 비교하였다. 본 논문의 결과로는 무음악과 선호 음악 및 무음악과 비선호 음악을 비교한 경우에서 유의한 차이를 나타내는 채널을 관측할 수 있었으며, 공통적으로 전두엽 부위의 채널인 F3 및 F4에서 평균의 차이를 나타냈다. 유의미한 차이를 나타낸 채널들에서도 음악이 없는 경우보다 음악이 제시된 경우의 파워가 더 크게 나타났으며, 선호도에 따라서는 선호 음악이 비선호 음악의 경우보다 두뇌의 활성도가 크게 나타난다는 사실을 실험결과로부터 확인할 수 있었다. In this paper, we presented the results of analysis with data obtained through EEG measurements to confirm the effect of musical stimulus when performing mathematical tasks. While the subject was solving a mathematical task, favorite and unfavorite music classified according to the subject s preference were presented as musical stimulus and the tasks were divided into memorization task and procedure task. The data measured in the EEG experiments was divided into theta waves, SMR waves and mid-beta waves which are the frequency bands related to concentration to compare the relative power spectrum values. In our results, in the case of comparing no music with favorite music and no music with unfavorite music, a significant difference was observed in the several channels, and the average difference was shown in the channels F3 and F4 of the frontal lobe. In that channels, the power was found to be greater when the music was presented than the case where there was no music. Depending on the subject s preference, it was confirmed that favorite music showed greater brain activity than unfavorite music.

취약성 자기애가 자기침묵에 미치는 영향: 실제-이상 자기불일치와 수치심의 매개효과

정유라 ( Yura Jung ) 한국심리유형학회 2019 심리유형과 인간발달 Vol.20 No.1

본 연구는 취약성 자기애와 자기침묵의 관계에서 실제-이상 자기불일치와 수치심의 매개 역할을 검증하고자 하였다. 이를 위해 성인 451명을 대상으로 병리적 자기애 척도, 자기 질문지, 수치심 경험 척도, 자기침묵 척도를 실시하여 자료를 수집하였으며, 이들 변인 간의 관계에 대한 가설적인 구조방정식모형을 설정하고 검증하였다. 이에 대한 결과는 다음과 같다. 첫째, 취약성 자기애가 자기침묵에 미치는 영향을 실제-이상 자기불일치가 부분적으로 매개하였다. 둘째, 취약성 자기애가 자기침묵에 미치는 영향을 수치심이 부분적으로 매개하였다. 셋째, 취약성 자기애가 자기침묵에 미치는 영향을 실제-이상자기불일치와 수치심이 순차적으로 부분매개하였다. 이러한 연구결과는 취약성 자기애를 지닌 개인이 대인관계에서 이상과 괴리된 실제 자신의 모습을 감추고, 수치심으로부터 자기(self)를 보호하기 위하여 자신의 생각과 감정을 감추는 방식으로 행동하는 자기침묵 경향이 있음을 보여준다. 본 연구의 의의 및 제한점, 후속 연구를 위한 제언을 논의에 포함하였다. The purpose of this study is to examine the mediating roles of actual-ideal self discrepancy and shame in relationship between vulnerable narcissism and self-silencing. 451 undergraduate students responded to the scales of pathological narcissism(Pathological Narcissism Inventory; PNI), self-silencing(Silencing The Self Scale; STSS), actual-ideal self discrepancy(Self Questionnaire), and shame(Korean Version of Experience of Shame Scale; K-ESS), and the data were analyzed by structural equation. The results of the study are as follows. First, the effect of narcissistic vulnerability on self-silencing was partially mediated by self-discrepancy. Second, the effect of narcissistic vulnerability on self-silencing was also partially mediated by shame. Third, the effect of narcissistic vulnerability on self-silencing was progressively mediated by self discrepancy and shame. These findings suggest that narcissistic vulnerability tends to actively conceal more negative or imperfect self-aspect and tends to present perfect or more ideal self-aspect in order to protect the unstable self-esteem and actual-ideal self discrepancy and to defend against vulnerability for shame. The implications, limitations and suggestions for future researches were discussed.

고분자 전해질형 연료전지의 최적운전을 위한 전압-전류, 전류-전력 특성 연구

정유라(You-Ra Jung),최용성(Young-Sung Choi),이경섭(Kyung-Sup Lee) 대한전기학회 2010 전기학회논문지 P Vol.59 No.1

Fuel cell as a renewable energy source is clean and has a lot of advantages. The source can solve energy crisis and environmental problems such as greenhouse effect, air pollution and the ozone layer destruction. This paper introduces hybrid system(hydro-Genius Professional, heliocentris) of solar cell and fuel cell. Also, this paper shows the I-P, V-I characteristics of fuel cells which are connected in parallel and series. From these results, we also found the maximum power was transferred at 0.5[Ω]. The terminal voltage was also decreased according to the current because of the internal resistance. The power transfer in series was two times than that in parallel.

PEM 연료전지의 전압-전류 특성에 관한 연구

정유라(You-Ra Jung),최용성(Yong-Sung Choi),황종선(Jong-Sun Hwang),이경섭(Kyung-Sup Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10

Recently, researchers are developing a new, clean, renewable and sustainable energy to the industrial areas and the residential areas. Solar cell and fuel cell energy are presented in this paper. Then the paper shows the Ⅰ-Ⅴ characteristics of the solar module which are dependent on the power of the halogen lamp and the P-Ⅰ and Ⅰ-Ⅴ characteristics of fuel cells which are connected in parallel and series.