산업용 우드펠릿의 자연발화 특성과 화재위험성에 관한 연구

최유정,김정훈,최재욱,Choi, Yu-Jung,Kim, Jung-Hun,Choi, Jae-Wook 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.5

화력발전소의 연료로 사용되는 우드펠릿을 시료로 하여 시료 용기의 크기에 따른 최소자연발화온도를 구하였으며, 이 온도로부터 Frank-Kamenetskii의 열발화 이론을 이용하여 겉보기 활성화 에너지를 구함으로써 물질의 위험성을 예측하였다. 용기의 크기가 클수록 발화한계온도는 낮아졌으며, 겉보기 활성화 에너지는 37.83 kcal/mol을 구하였다. 또한 시료의 용기가 커질수록 발화유도시간 및 최고온도에 도달하는 시간이 길어졌다.

한국의 다양한 가족 형태에 대한 사회적 인식

최유정,신아름,최샛별,Choi. Yu Jung,Shin. A-Reum,Choi. SetByol 한국가족학회 2015 가족과 문화 Vol.27 No.2

본 연구는 대중매체나 마케팅 분야에서 창출되거나 소개된 알파맘, 기러기 가족, 딩크족, 싱글맘, 골드미스 등의 용어들을 통해 그와 연계된 다양화된 가족 형태에 대한 일반인들의 평가나 태도가 재생산되거나 변화될 수 있다는 전제 하에, 이 용어들에 대한 사회적인 인식과 성별 및 연령에 따른 차이를 파악하는 내용을 담고 있다. 연구 결과를 요약하면 다음과 같다. 첫째, 정형적 핵가족을 전제하는 ‘알파맘’ 이외의 개념들에 대한 시각은 부정적이다. 평균 점수는 알파맘, 골드미스, 싱글맘, 기러기 가족, 딩크족의 순이다. 성별에 따라서는 각 개념 을 여성이 남성보다 긍정적으로 인식한다. 특히 골드미스에 대한 의견에서 남녀간 입장차가 크다. 둘째, 알파맘을 제외한 나머지 개념들에서 연령대별 차이가 확인되는데, 6, 70대가 가 장 보수적이고, 30대는 가장 개방적이다. 딩크족, 싱글족, 골드미스는 연령대가 낮을수록 우호적으로 바라보고 기러기 가족은 4, 50대, 2, 30대, 6, 70대로 가면서 더 부정적으로 평가한다. 셋째, 성별과 연령의 복합적인 효과를 보면 알파맘에 대해서는 4, 50대에서, 기러기 가족은 40대와 60대에서, 딩크족은 20, 30, 50대에서, 골드미스는 2, 3, 4, 50대에서 여성 이 동년배 남성에 비해 긍정적인 태도를 보인다. 남성 집단 내에 알파맘, 기러기 가족에 대한 이견은 없으나, 딩크족, 싱글맘, 골드미스에 대한 의견에서는 더 보수적인 6, 70대와 타 연령대가 대비를 이룬다. 여성 집단 내에서는 모든 개념에서 연령대에 따른 차이가 두드러진다. 알파맘의 경우 30대 여성이 다소 부정적이고, 기러기 가족은 3, 4, 5, 60대 여성이 상대적으로 덜 비판적으로 본다. 딩크족과 골드미스에 대한 부정적인 태도는 여성의 연령대가 높아질수록 강화되고 있다. 이상의 결과를 종합하면 대중매체에 의한 새로운 가족 개념들은 다 양한 가족 형태와 연계된 긍정적 이미지를 강화하기보다는 재생산하거나 고착시키는 성격이 강하며, 이러한 효과는 연령과 성별에 따라 상이하다고 할 것이다. The terms related to diversified family types such as Alpha mom, goose family, DINK (Double Income No Kids), single mom, gold miss have been newly coined by mass media. This study is based on a premise that the social perceptions on the family types can be reproduced or changed through these. The purpose of the study is to analyze the differences according to gender and age. The results are as the following. Firstly, the perspectives on concepts excluding Alpha mom, which is premised on stereotypical nuclear families are negative. According to gender, females perceive each concept more positively, especially in viewing gold miss. Secondly, there are differences by age groups in other concepts except Alpha mom; 60s and 70s are the most conservative and 30s are the most open. More the younger perceive DINK, single people, and gold miss more amicably, and goose family is perceived more negatively in the order of the 40s-50s, 20s-30s, and 60s-70s. Thirdly, from the complex effect of gender and age, females have a more positive attitude compared to men of the same age towards Alpha mom in their 40s-50s, goose family in their 40s and 60s, DINK in their 20s, 30s, 50s, and gold miss in their 20s, 30s, 40s, and 50s. There are no different opinions of Alpha mom and goose family within male groups, but 60s and 70s are more conservative compared to other age groups on DINK, single mom, and gold miss. In female groups, there is a conspicuous difference in the perception of all the concepts according to age groups. In the case of Alpha mom, females in their 30s have a rather negative viewpoint while females in 30s, 40s, 50s, and 60s are less critical of goose family. A negative attitude towards DINK and gold miss is reinforced as the female age is older.

독거노인의 외로움과 수면의 관계

최유정,이경규,이석범,김경민,김도현,이정재,Choi, Yu Jung,Lee, Kyung Kyu,Lee, Seok Bum,Kim, Kyung Min,Kim, Dohyun,Lee, Jung Jae 한국정신신체의학회 2020 정신신체의학 Vol.28 No.2

Objectives : Loneliness and poor sleep quality are common phenomena in old age and are associated with negative physical and mental health. However, little is known regarding the relation between loneliness and sleep quality. The aim of this study was to examine the association of loneliness and sleep quality among the elderly living alone. Methods : This is a cross-sectional study that enrolled 1,090 subjects who are the community-residing elderly living alone. Sociodemographic status, medical condition, cognition, mood disorder, sleep quality and levels of loneliness were collected using a self-administered questionnaire and a specific semi-structured interview conducted by trained nurses. Descriptive statistics were used to analyze data regarding sociodemographic variable and loneliness. Univariate and Multivariate regression analyses were applied to examine the association between loneliness and sleep quality after adjustment for multiple confounding variables. Results : The Pittsburgh Sleep Quality Index (PSQI) mean score of "lonely group" (9.2±4.2) was significantly higher than that of "not lonely group" (7.3±3.7) (student-t test, p<0.001). Loneliness was significantly associated with PSQI (standardized β=0.065, p=0.025), sleep disturbance (standardized β=0.086, p=0.005), use of sleep medication (standardized β=0.065, p=0.034) after adjustment for possible confounding variables including sex and mood disorder. Conclusions : Loneliness was associated with sleep disturbance and this finding implied negative impact of loneliness on sleep quality of older adults. Public health promotion efforts to reduce loneliness may improve sleep quality and mental health in the elderly living alone.

동적인 배경에서의 사람 검출 알고리즘

최유정,이동렬,김윤,Choi, Yu Jung,Lee, Dong Ryeol,Kim, Yoon 강원대학교 산업기술연구소 2018 産業技術硏究 Vol.38 No.1

Recently, object detection is a critical function for any system that uses computer vision and is widely used in various fields such as video surveillance and self-driving cars. However, the conventional methods can not detect the objects clearly because of the dynamic background change in the beach. In this paper, we propose a new technique to detect humans correctly in the dynamic videos like shores. A new background modeling method that combines spatial GMM (Gaussian Mixture Model) and temporal GMM is proposed to make more correct background image. Also, the proposed method improve the accuracy of people detection by using SVM (Support Vector Machine) to classify people from the objects and KCF (Kernelized Correlation Filter) Tracker to track people continuously in the complicated environment. The experimental result shows that our method can work well for detection and tracking of objects in videos containing dynamic factors and situations.

프로필렌의 화재 및 폭발 위험성 평가를 위한 온도 200 oC에서 산소농도와 압력의 변화에 따른 실험적 연구

최유정 ( Yu-jung Choi ),최재욱 ( Jae-wook Choi ) 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.3

Propylene is widely used in petrochemical manufacturing at over 200 ℃. However, since propylene is a flammable gas with fire and explosion risks, inert nitrogen is injected to prevent them. In this study, experiments were conducted using propylene-nitrogen-oxygen upon pressure changes at 200 ℃. At 21% oxygen, as pressure increased from 0.10 MPa to 0.25 MPa, lower explosion limit (LEL) decreased from 2.2% to 1.9% while upper explosion limit (UEL) increased from 14.8% to 17.6%. In addition, minimum oxygen concentration (MOC) decreased from 10.3% to 10.0%, indicating higher risks with the expanded explosive range as pressure increased. With increase of pressure from 0.10 MPa to 0.25 MPa, explosion pressure increased from 1.84 MPa to 6.04 MPa, and the rate of rise of maximum explosion pressure increased drastically from 90 MPa/s to 298 MPa/s. It is hoped that these results can be used as basic data to prevent accidents in factories using propylene.

세대에 따른 직업 관련 사회정체성의 사회심리학적 의미

최유정(Yu-Jung Choi),최샛별(SetByol Choi),이명진(Myoung-Jin Lee) 한국인구학회 2011 한국인구학 Vol.34 No.3

이 연구는 사회정체성 개념을 이론적 자원으로 활용하여 사회성원들이 직업 관련 정체성들을 인식하는 방식에서 나타나는 세대별 특성을 비교, 분석함으로써 사회적인 합의와 균열의 지점들을 살펴보았다. 사회정체성의 세 차원인 평가성, 권력성, 활동성을 살펴본 결과, 직업 관련 정체성에 있어서는 세대 차이보다는 합의가 우세하였다. 총 44개 정체성 중 세대차가 유의미한 것은 장관, 국회의원, 비행기 조종사, 농부의 평가성과, 대기업 사장, 교수, 의사, 간호사, 연예인, 무당, 실업자의 권력성뿐이다. 지도자 및 전문직에서는 평가성과 권력성 모두에서 50대가 다양한 정체성들을 일관되게 높이 평가한 반면,30대는 부정적 태도를 견지했으며,20대와 40대는 다분히 중간적인 입장을 보였다. 권력성에서는 2, 30대와 4, 50대로 나뉘어 젊은 세대가 이 범주 정체성들의 권력을 상대적으로 낮게 평가하는 경향이 관찰된다. 일반 직군의 경우에도 2, 30대의 평가 점수가 다소 낮은데 그 정도는 평가성에서 더욱 뚜렷하다. 종교와 관련해서는 2, 30대가 스님에 대해, 4, 50대가 목사에 대해 호의적이다. 지도자 및 전문직에 대한 세대별 태도를 분석해본 결과, 이 정체성들의 평가성과 권력성 모두를 높게 인정하는 50대에 비해 40대,30대, 20대로 오면서 평균값의 하락과 분포의 집중 경향이 심화된다. 30대는 평가성 차원에서, 20대는 권력성 차원에서 이 범주에 대한 비판적인 태도를 보여준다. This study initiated with the intention to reveal the social consultations and fissures through a comparative analysis on generational characteristics by indicating occupation-related identities with the concept of social identity supported by theoretical resources. According to the three dimensions of social identity which are evaluation, potency and activity, there was more generational agreement rather than difference toward occupation-related identities. Among the 44 identities, only evaluation dimensions on minister, congressman, plane captain, farmer and potency dimensions on CEO of a major companies, professor, medical doctor, nurse, celebrity, shaman, unemployed person were statistically significant. For "Leader and Professional", the respondents in their 50"s gave high scores in both evaluation and potency dimensions. On the other side, the 30"s had negative viewpoints while the 20"s and 40"s had neutral perspectives. For the potency dimension, the age groups were divided into the 20"s, 30"s and 40"s, 50"s; having the younger generations underestimate the potency dimension of such categories. Also for the "General Occupation", 20"s and the 30"s relatively devaluated with more distinctive degree toward evaluation dimensions. For religion, 20"s and 30"s were positive toward buddhist monks while the 40"s and 50"s were more favorable with priests. For the non-economically active population, the lifetime cycle influenced each generations. When performing a two dimensional analysis toward the "Leader and Professional" with evaluation and potency on each axis, the 50"s highly evaluated both evaluation and potency dimension of such identities. However, for the 40"s, 30"s and 20"s, the average value fell while the focus of the distribution deepened. The 30"s had negative perspective toward the evaluation dimension while the 20"s reflected critical attitude toward the potency dimension.

음양오행과 간지의 상관성 연구

최유정(Yu-jung Choi) 원광대학교 동양학대학원 2023 동양학연구 Vol.19 No.-

음양오행은 동양철학을 근간으로 하는 우리 삶의 모든 부분에 깊숙히 내재되어 있다. 그만큼 동양의 역사속에서 빠질 수 없는 부분이다. 음양오행은 자연환경과 사회속에서 긴밀한 관계를 갖고 삶의 모든 부분에 응용되어지고 사용되어져왔다. 그럼에도 불구하고 그 가치를 제대로 인식하지 못 하고 있는 것이 지금의 현실이다. 또한 음양오행론에 대한 연구가 그동안 문헌적인 연구만을 근거로 하여 해석되어지는 경우가 많았기 때문에 조금 미흡한 부분이 있을 수도 있다. 또한 음양오행론의 구조가 과학적인 부분과 비과학적인 부분을 이루어져 있기 때문에 다소 설득력이 떨어지는 부분은 있을 수 있다. 과학사적인 관점을 광의의 과학과 협의의 과학으로 나누어 볼때 포괄적인 개념인 광의의 과학에 음양오행론을 포함시킬 수 있다. 또한 인문학적 관점에서 자연과학과 인문과학을 나누어볼 때 음양오행론을 인문과학에 포함시킬 수 있어, 인문과학으로서의 음양오행론도 연구해볼 가치가 있는 것이다. 사주명리학의 기본 구조인 사주팔자도 음양오행과 간지의 결합방식으로 이루어져있으며, 이를 근간으로 하여 해당 명조를 해석한다. 또한 한의학에 있어서도 음양오행론의 상생상극을 응용하여 인체에 각 부분에 적용함으로써 병을 진단하고 치료하는 근간으로 삼고 있다. 이 밖에도 동양사에 있어서 여러 다양한 방면에서 음양오행론은 응용되어 쓰여지고 있다. 따라서 동양학사에서는 음양오행과 간지를 빼놓고는 동양학사를 논할 수는 없을 것이다. 이러한 연유로 본 논문에서는 역사적 맥락 속에서 음양오행과 간지가 우리의 삶에서 어떤 역할을 해왔는지 알아보기로 하겠다. 또한 이 둘의 상관성을 알아봄으로써 음양오행과 간지의 결합구조가 유기적이고 합리적인 방식의 기호체계였음을 확인할 수 있을 것이다. Yin-Yang and Five Elements are deeply immanent in every part of our lives based on Eastern philosophy. It is an indispensable part of Eastern history. Yin-Yang and Five Elements have been applied and used in all parts of life with a close relationship in the natural environment and society. However, the reality is that the value is not properly recognized. In addition, since studies on the Theory of Yin-yang and Five Elements have been interpreted based only on literature review, they may be somewhat insufficient. Also, they may be less persuasive because the theory consists of scientific and unscientific parts. When the viewpoint of scientific history is divided into science in a broad sense and science in a narrow sense, the Theory of Yin-yang and Five Elements can be included in a comprehensive concept of wider science. Besides, when natural science and human science are divided from the perspective of humanities, the Theory of Yin-yang and Five Elements can be included in human science, so it is worth studying the theory as human science. Saju Palja (the Four Pillars and the Eight Characters), the basis of Saju Myeongli (Four Pillars of Destiny Science), is also made up of the combination of Yin-Yang & Five Elements and Ganji, and based on this, the Myeongjo is interpreted. In oriental medicine, Sang-Saeng (相生, inter promoting) & Sang-Geuk (相剋, inter acting) of the Theory of Yin-Yang and Five Elements is applied to each part of the human body as the basis for diagnosing and treating diseases. Besides, Yin-Yang and Five Elements are variously applied and used in Eastern history. Therefore, the history of Oriental Studies cannot be discussed without Yin-Yang & Five Elements and Ganji. For this reason, this study will look into what role Yin-Yang & Five Elements and Ganji have played in our lives in the historical context. In addition, it will be able to find that the combination of Yin-Yang & Five Elements and Ganji is an organic and rational symbol system by examining the relationship between the two.

아동의 사회적 관계 및 심리적 특성과 문제 행동의 관계

최유정 ( Yu Jung Choi ),최샛별 ( Set Byol Choi ) 대한가정학회 2007 Human Ecology Research(HER) Vol.45 No.1

가정 내 역할 수행 및 돌봄 노동 시간에 영향을 미치는 요인의 남녀 차이에 관한 연구

최유정 ( Yu Jung Choi ),최미라 ( Meera Choi ),최샛별 ( Setbyol Choi ) 연세대학교 사회과학연구소 2019 사회과학논집 Vol.50 No.1

This study aims to compare the difference of married men and women’s mechanisms in playing their family role, especially on explaining how such differences are manifested in the area of ‘care’. This study uses Korean General Social Survey data from 734 sample of married men and women. The results are summarized as follows. First, among various factors, time availability had the highest predictive power in both men and women’s ‘family role performance’ and ‘care labor.’ For women, a great diversity of variables related to time availability was prominent in both the overall family role performance and care labor. Women spent more time on the family role when their working hours were shorter and the spouse’s care labor time and working hours were longer. On the other hand, men spent more time on housework and care labor when their spouse’s care labor time were longer. This revealed that the family role performance of men was “interconnected” rather than “divided.” Secondly, the life course was also an important factor that affects overall family role performance and care labor for both men and women. In particular, “children of school age” increased women’s role in the family especially care labor. On the contrary, for men, their family role performance and care labor time decreased as children grew bigger. Thirdly, the relative resources couple possess had insignificant influence on family role performance. While for men, ‘wife’s objective level of income’ was a significant factor, women tend to spend more time on care labor when their ‘relative income level’ is greater than their husbands. However, in both cases, the relative influence was not that significant. Nonetheless, this suggests that the wife’s economic resource and a shortage of time does not provide a legitimate reason to avoid their housework. In addition, women who earn more income than their husbands tend to practice gender role ideology by spending more time on care labor.

다세대 사회계층이동 연구의 필요성에 대한 시론

최유정 ( Yu Jung Choi ),주혜정 ( Hyae Jeong Joo ),최샛별 ( Setbyol Choi ) 국민대학교 사회과학연구소 2021 사회과학연구 Vol.33 No.2

This paper started with the aim to seek a direction that intergenerational social mobility studies should pursue in the future by referring to Western research trends while exploring related works in South Korea. Specifically, we examined intergenerational mobility studies conducted in South Korea and their findings and the current flow of multigenerational mobility studies as a new research trend in Western academia. Based on this review, we raised the need to introduce a multigenerational mobility model into South Korean society and carried out a task of organizing various intergenerational mobility mechanisms addressed in three-generation studies. Three-generation studies in Western society have mainly focused on social institutions, a direct transfer of perishable and durable resources, cumulative advantages and disadvantages, lagged or delayed effects from ancestors including grandparents, interactions with structural inequalities, and other grandparent influences in case of absence of parents and demographic and biological processes. They also have pointed out that it was important to take account of heterogeneity in multigenerational influences due to social and national differences, social class of the family, and gender. Thus, we argue that our two-generational mobility model needs to expand and develop into a multigenerational model that fully reflects the aforementioned points. Furthermore, extensive data production and accumulation of both quantitative and qualitative information, which enables empirical testing of the new model, is needed along with actual empirical analyses. This active effort would contribute to resolving the imbalance in existing multigenerational mobility studies, which have largely been dependent on quantitative data analysis and skewed toward Western contexts such as the U.S. and Europe. It is also expected to provide an important leap in related research areas in South Korea.