고주파 저스트레인 골자극 인가용 진동 시스템 개발

유주연,박근철,전아영,김윤진,노정훈,전계록,Yoo, Ju-Yeon,Park, Guen-Chul,Jeon, Ah-Young,Kim, Yun-Jin,Ro, Jung-Hoon,Jeon, Gye-Rok 대한의용생체공학회 2011 의공학회지 Vol.32 No.2

In this study, the system for application of the bone stimulation was implemented using high frequency and low strain method. The whole system consists of the high frequency and low strain vibration stimulation system 177 for stimulating bone, LVDT sensor, and wireless sensor based on tri-axial accelerometer. To evaluate the usefulness of the system, the frequencies and accelerations from function generator were applied to the vibration stimulation system. The range of frequency was 17 Hz, 30 Hz, 45 Hz, 50 Hz and the range of acceleration was set 0.3 g, 0.6 g, 1g, and 2 g. The measured frequencies and acceleration using LVDT (linear variable difference transformer) sensor and 3-axial accelerometer were estimated and compared. The range of frequencies average difference was from 0.0 to 0.004 Hz. As the standard deviation of frequencies estimated by LVDT sensor and accelerometer was below 0.03 Hz and the output frequencies of function generator were similar: Also the results of t-test were satisfied with conditions of p > 0.05. And the acquired frequencies and acceleration from vibration measuring device module were estimated and analyzed. As the mean of accelerations was similar to the acceleration applied from function generator. And the standard deviation of acceleration estimated from vibration measuring device module was ranged from 0.019 g to 0.038 g. Also the results of t-test were satisfied with conditions of p > 0.05. Therefore, these results were airy similar to the acceleration applied from function generator. As a result, the usefulness of the system was confirmed. n a further study, clinical experiment will be carried out with the authorization of IRB (institutional review board) so that appropriate frequency and strain would be investigated in clinical field.

LTCC 전극공정부산물 침출 용액으로부터 은 회수 및 은 나노입자 제조

유주연,강유빈,박진주,류호진,윤진호,이근재,Yoo, Juyeon,Kang, Yubin,Park, Jinju,Ryu, Hojin,Yoon, Jin-Ho,Lee, Kun-Jae 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.4

There has been much interest in recycling electronic wastes in order to mitigate environmental problems and to recover the large amount of constituent metals. Silver recovery from electronic waste is extensively studied because of environmental and economic benefits and the use of silver in fabricating nanodevices. Hydrometallurgical processing is often used for silver recovery because it has the advantages of low cost and ease of control. Research on synthesis recovered silver into nanoparticles is needed for application to transistors and solar cells. In this study, silver is selectively recovered from the by-product of electrodes. Silver precursors are prepared using the dissolution characteristics of the leaching solution. In the liquid reduction process, silver nanoparticles are synthesized under various surfactant conditions and then analyzed. The purity of the recovered silver is 99.24%, and the average particle size of the silver nanoparticles is 68 nm.

폴리올 공정과 액상 환원 공정에 따른 은 입자 제조 및 특성 평가

유주연,장효성,이근재,Yoo, Juyeon,Jang, Hyosung,Lee, Kun-Jae 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.4

Ag nanoparticles are extensively studied and utilized due to their excellent catalysis, antibiosis and optical properties. They can be easily synthesized by chemical reduction methods and it is possible to prepare particles of uniform size and high purity. These methods are divided into vapor methods and liquid phase reduction methods. In the present study, Ag particles are prepared and analyzed through two chemical reduction methods using solvents containing a silver nitrate precursor. When Ag ions are reduced using a reductant in the aqueous solution, it is possible to control the Ag particle size by controlling the formic acid ratio. In addition, in the Polyol process, Ag nanoparticles prepared at various temperatures and reaction time conditions have multiple twinned and anisotropic structures, and the particle size variation can be confirmed using field emissions scanning electron microscopy and by analyzing the UV-vis spectrum.

에코마일리지를 통해 서울에너지복지시민기금에 기부하는 시민들의 동기분석

유주연(Juyeon, Yoo),여지원(Jiwon, Yeo),조은별(Eunbyeol, Jo) 한국환경정책학회 2017 한국환경정책학회 학술대회논문집 Vol.2017 No.11

영아의 기질과 영아-교사 관계에서 부모-교사 협력의 조절효과

유주연(Jooyun Yoo) 한국열린유아교육학회 2018 열린유아교육연구 Vol.23 No.5

본 연구는 영아의 기질적 특성인 부정적 정서성과 의도적 통제가 영아-교사 관계에 미치는 영향을 부모-교사 협력이 조절하는가에 대해 알아보았다. 서울과 경기도 지역어린이집 16곳의 교사 41명을 대상으로 그들이 담임을 맡고 있는 영아 123명(남아 67명, 여아 56명)에 대한 자료를 수집하였다. 자료 분석은 기술통계와 t-test를 실시하였고, 위계적 회귀분석을 통해 조절효과를 검증하였다. 연구결과는 첫째, 영아의 기질 중 의도적 통제와 영아-교사 친밀관계에 있어서 성차가 뚜렷이 나타났다. 둘째, 영아의 부정적 정서성과 의도적 통제, 부모-교사 협력은 영아-교사 갈등 관계에 유의한 영향을 미치며, 특히 부모-교사 협력은 부정적 정서성이 영아-교사 갈등 관계에 미치는 영향을 조절하는 것으로 나타났다. 반면, 영아-교사 친밀관계에는 영아의 기질인 의도적 통제만이 유의한 영향을 미치는 것으로 나타났다. 이는 발달에 있어서 취약한 기질적 특성이라 할 수 있는 부정적 정서성이 영아-교사 갈등관계에 미치는 영향에 부모-교사 협력이 보호요인으로 작용할 수 있음을 의미하며, 보육현장에서 부모의 참여가 영아의 생활과 발달에 영향을 주고 있음을 시사한다. The purpose of this study is to investigate the effect of temperamental characteristics, such as negative affect and effortful control on toddler-teacher relationship and to examine the moderating effect of parent-teacher cooperation. A total of 41 teachers of 123 infants (67 boys, 56 girls) were recruited from 16 day care centers in Seoul and Gyeonggi provinces. Descriptive statistics and t-test and hierarchial regression were used to analyze the collected data. The results were as following. First, there was a clear difference between effortful control of toddlers’ temperament and toddlerteacher intimacy. Second, toddlers’ negative affect, toddlers’ effortful control, and parent-teacher cooperation have significant influences on toddler-teacher conflict, and especially parent-teacher cooperation appeared to moderate the influence of negative affect on toddler-teacher conflict. On the other hand, toddler - teacher intimacy is shown to be significantly influenced only by infant temperament, effortful control. This implies that parent-teacher cooperation can be a protective factor for the influence of negative affect, a potential vulnerable temperament characteristic, on toddler-teacher conflict relations. It suggests parent involvement influences toddler’s daily life and development.

해외 친환경레스토랑 인증제도 비교분석 연구

유주연(Joo Yeon Yoo) 한국관광연구학회 2014 관광연구저널 Vol.28 No.9

A response to climate change and sustainable development following environmental problems such as environment pollution and depletion of energy source are being recognized as issues for all areas of the world representing themselves as ‘eco-friendly’ awareness and attention for the environment. The impact of restaurants on the environment is one of the most significant factors in recognized human behaviors impeding the sustainable growth of the earth. For this reason, the restaurant business needs to participate in responding to global warming and cooperate in preventing environmental pollution to prepare for the advent of low-carbon society. Many countries around the world have already established evaluation standards for environmental performance of restaurants, and the certification system of green restaurants are currently being enforced in major countries according to their circumstances. However, Korea has still not developed a certification standard in consideration of conditions of restaurants. Therefore, this research seeks to compare and analyze items and standards of evaluation in the certification standards of green restaurants that are in operation overseas prior to the development of domestic certification standard of green restaurants to examine the characteristics of each country’s certification system, prepare reference material for the future development of domestic certification system of green restaurants and propose research directions.

부모-교사 관계가 영아기 자녀를 둔 어머니의 양육효능감에 미치는 영향

유주연(Jooyun Yoo) 한국보육지원학회 2018 한국보육지원학회지 Vol.14 No.4

Objective: The purpose of this study was to examine the effects of parentteacher relationships on mothers’ parenting efficacy especially for toddlers. Methods: 225 mothers of toddlers completed questionnaires on parent-teacher relationships and parenting efficacy. This study used technical statistics, Pearson’s correlation analysis, and multiple regression analysis in order to analyze the collected data. Results: First, there was a significant correlation between parent-teacher relationships and mothers’ parenting efficacy. Second, the parent-teacher relationships was an important factor in predicting mothers’ parenting efficacy. In particular, when a teacher and mother develop practical collaboration for caring for and educating a child, the mothers’ parenting efficacy was higher. Conclusion/Implications: These findings indicate that the parent-teacher relationship is a significant factor in order to improve the quality of parenting. The results especially support the importance of collaboration between teachers and parents and suggest that we need to find practical ways for collaborating in the field. Limitations of this study and implications for future research were discussed

프랜차이즈 베이커리 종사원의 직무특성, 직무만족, 이직의도 간의 영향관계

유주연(Joo Yeon Yoo) 한국조리학회 2016 한국조리학회지 Vol.22 No.3

중학생의 섭식장애행동과 학업적응도의 관계 연구

유주연(Joo Yeon Yoo),진양호(Yang Ho Jin),배세정(Se Jeong Bae) 대한지역사회영양학회 2012 대한지역사회영양학회지 Vol.17 No.6

The purpose of this study was to verify the difference of middle school students` eating disorder behavior and scholastic adjustment according to the gender and weight group and evaluate correlations between their eating disorder behavior and scholastic adjustment. A survey was conducted in middle school second graders attending five schools located in Seoul. Results from 355 questionnaire sheets were utilized for statistical analysis, and the results were gained as below: With regard to eating disorder behavior by gender, female students showed more eating disorder behavior than male students (p < 0.01); however, scholastic adjustment did not indicate significant differences by gender. According to the result of analyzing scholastic adjustment according to the weight group, the obese group showed lower scholastic adjustment (p < 0.05) and adjustment to studying (p < 0.01) than other groups; however, the eating disorder behavior, attachment to school, and adjustment to school did not indicate significant differences. According to the results of analyzing scholastic adjustment by eating disorder group, the normal group showed higher adjustment to studying than the risky group (p < 0.01). And scholastic adjustment, attachment to school, and adjustment to school did not indicate significant differences. The eating disorder behavior showed negative relationship with adjustment to studying. They showed more eating disorder behavior, their adjustment to studying became lower. Therefore, it is necessary to provide nutritional education at home and at school for them to have appropriate dietary habits as well as health education for them to maintain normal weight. (Korean J Community Nutr 17(6) : 707~713, 2012)

현대 패션쇼에 나타나는 인형과 인형이미지의 내적 의미

유주연 ( Ju Yeon Yoo ),권기영 ( Gi Young Kwon ) 대한가정학회 2014 Human Ecology Research(HER) Vol.52 No.1

The purpose of this study is to analyze the internal meanings of dolls and dolls`` images expressed in modern fashion show. Dolls are used as sacred object, decoration object, playing object, personified object or cherished object. The expression types of doll image in modern fashion are as following; substitutes of multi-ego, object of sexual desire, objectified creature, and medium of transcending fantasy. First, dolls image as substitutes of multi-ego had been expressed in magical expression, disgusting mask, transparent mannequin, expressionless, horror, conflict, loss of identity, exaggeration or escapism. Second, as object of sexual desire, dolls image are expressed as naked baby, ambiguous expression, naked body, voluminous body, emphasized specific bodypart, heavy makeup or wax doll of sexy actresses. Third, as objectified creature, dolls are human body in passive form. Human bodies are disassembled and reassembled as dolls. Such dolls reflect serious reality. They wrap up human like product and objectify it. Fourth, dolls image expressed as medium of transcending fantasy recollects youth age or expresses imagination on ambiguous virtual reality. Like this, dolls have value as creatures in various fields of modern fashion. Dolls contribute a lot in creating important inspiration. Dolls also expose internal mentality and represent ego. Externally, dolls express human shape becoming more and more materialized and objectified by advancing scientific technology in digital capitalistic society.