질화규소의 기계적 특성에 미치는 미세구조 및 소결조제의 영향

박혜련,이오상,박희동,이재도,Park, Hye-Ryeon,Lee, O-Sang,Park, Hui-Dong,Lee, Jae-Do 한국재료학회 1992 한국재료학회지 Vol.2 No.5

Four distinctive hot pressed and heat treated S${i_3}{N_4}$ceramics, S${i_3}{N_4}$-8%${Y_2}{O_3}$, S${i_3}{N_4}$-6% ${Y_2}{O_3}$-2% $A{l_2}{O_3}$, S${i_3}{N_4}$-4% ${Y_2}{O_3}$-3% $A{l_2}{O_3}$, 그리고 S${i_3}{N_4}$-1% MgO-1% Si$O_2$(in wt%), were prepared and characterized by X-ray diffraction, scanning electron microscopy, image analysis and mechanical tests. The fracture toughness of S${i_3}{N_4}$-8% ${Y_2}{O_3}$specimens containing large elongated grains showed the highest value of about 9.8MPa$m^{1/2}$. Two out of four S${i_3}{N_4}$, ceramics(S${i_3}{N_4}$-6% ${Y_2}{O_3}$-2% $A{l_2}{O_3}$and S${i_3}{N_4}$-4% ${Y_2}{O_3}$-3% $A{l_2}{O_3}$) heat treated at 200 $0^{\circ}C$retained the fracture strength of over 900MPa and fracture toughness of over 8.0MPa$m^{1/2}$. Large ${\beta}$-S${i_3}{N_4}$grains having a diameter larger than 1${\mu}$m appeared to contribute to increase in fracture toughness. 질화규소 소재로 S${i_3}{N_4}$-8%${Y_2}{O_3}$, S${i_3}{N_4}$-6% ${Y_2}{O_3}$-2% $A{l_2}{O_3}$, S${i_3}{N_4}$-4% ${Y_2}{O_3}$-3% $A{l_2}{O_3}$, 그리고 S${i_3}{N_4}$-1% MgO-1% Si$O_2$의 4가지 조성을 선정하여 주상모양의 ${\beta}$-S${i_3}{N_4}$결정상을 성장시켰으며, XRD, SEM, 입도분석과 기계적 특성을 조사하였다. S${i_3}{N_4}$-8% ${Y_2}{O_3}$에서는 파괴인성값을 9.8MPa$m^{1/2}$까지 얻었으며 200$0^{\circ}C$에서 열처리한 후에도 파괴강도(>900MPa)의 감소없이 파괴인성이 8.0MPa$m^{1/2}$이상인 S${i_3}{N_4}$-6% ${Y_2}{O_3}$-2% ${l_2}{O_3}$, 와 S${i_3}{N_4}$-4% ${Y_2}{O_3}$-3% $A{A_2}{O_3}$를 얻었다. 질화규소의 파괴인성이 ${\beta}$-S${i_3}{N_4}$-결정상 크기의 증가에 따라 직선적으로 증가하는 관계를 갖는 파괴인성에 대한 미세구조의 영향을 고찰하였다.

직장인의 슬기로운 식생활

박혜련,Park, Hye-Ryeon 한국발명진흥회 2007 發明特許 Vol.32 No.4

1형 당뇨병 청소년의 체질량지수가 섭식장애에 미치는 영향: 신체 불만족, 자아존중감, 우울의 매개효과를 중심으로

박혜련 ( Hye-ryeon Park ),주현옥 ( Hyeon Ok Ju ) 한국모자보건학회 2021 한국모자보건학회지 Vol.25 No.2

Purpose: The purpose of this study was to verify the mediating effects of body dissatisfaction, self-esteem, and depression on the association between the body mass index (BMI) and eating disorders in adolescents with type 1 diabetes. Methods: Secondary data were analyzed in this study. The original analysis was conducted using data from 136 adolescents aged 13-18 years with type 1 diabetes. The results of testing for mediating effects were analyzed using a serial-multiple mediation model (model 6) using the PROCESS macro in SPSS ver. 3.3. Results: The direct effect of the BMI on eating disorders was not statistically significant (effect=0.22; 95 % confidence interval [CI], -0.20 to 0.64), but the indirect effects were statistically significant (effect= 0.28; 95% CI, 0.05-0.63). In detail, the indirect effect of BMI on eating disorders mediated by body dissatisfaction was statistically significant (effect=0.28; 95% CI, 0.10-0.61); by body dissatisfaction and depression was statistically significant (effect=0.06; 95% CI, 0.01-0.15); and by body dissatisfaction, self-esteem, and depression was statistically significant (effect=0.05; 95% CI, 0.01-0.11). Conclusion: Individual interventions according to BMI are required to prevent the development of eating disorders in adolescents with type 1 diabetes. Adolescents with type 1 diabetes require intervention programs that may positively change their attitudes toward themselves, increasing self-esteem and lowering depression.

간호대학생의 간호전문직관 영향요인: 전환충격과 무례함 중심으로

박혜련 ( Park Hye-ryeon ),전혜정 ( Jun Hyejung ),반민경 ( Ban Min Kyung ) 경희대학교 동서간호학연구소 2021 동서간호학연구지 Vol.27 No.1

Purpose: The purpose of this study was to understand the correlations between transitional shock, incivility and nursing professionalism among nursing students. Methods: A total of 143 nursing students completed transitional shock, incivility and nursing professionalism, using structured questionnaires. The collected data were analyzed using the t-test, ANOVA, Pearson’s correlation coefficient, and multiple regression analysis. Results: The results showed that nursing professionalism was significantly correlated with gender (β=.20, p=.001), major satisfaction (β=.44, p=.007), clinical practice satisfaction (β=.45, p<.001), transitional shock (β=-.20, p=.012), and incivility experienced (β=-.18, p=.021) among nursing students. Conclusion: It is necessary to develop a plan for reducing individual satisfaction with clinical practice and the transitional shock of nursing students. It ultimately may increase nursing students’ nursing professionalism. In addition, a strategy is needed to reduce incivility among nursing students by creating positive educational environment in clinical practice through cooperation between schools and training institutions, and to strengthen desirable nursing professionalism.

증착온도와 La조성비가 ECR 플라즈마 화학기상증착법으로 증착한 (Pb, La)$\textrm{TiO}_3$박막의 물성에 미치는 영향

정성웅,박혜련,이원종,Jeong, Seong-Ung,Park, Hye-Ryeon,Lee, Won-Jong 한국재료학회 1997 한국재료학회지 Vol.7 No.3

PLT 박막의 증착방법으로 ECR PECVD법을 이용한 경우 $440~500^{\circ}C$의 비교적 낮은 온도에서 순수한 perovskite구조를 가진$(Pb,La)TiO_{3}$박막을 성공적으로 제조하였다. 기판온도 증가에 따라 반응기체 및 산화물(특히 Pb oxkde)의 휘발성이 증대되어 증착속도가 감소하고 (Pb oxide)의 휘발성이 증대되어 증착속도가 감소하고 (Pb+La)/Ti조성비가 감소하였다. $460~480^{\circ}C$의 온도범위에서 증착한 PLT 박막이 화학양론비를 가장 잘 만족하였으며 이때 높은 유전상수와 가장 우수한 누설전류 특성을 나타내었다. $La(DPM)_{3}$ 유입량 증가에 따라 $(Pb, La)TiO_{3}$ 박막의 La 조성이 거의 직선적으로 비례하여 증가하였는데 La/Ti비가 3.0%에서 9.5%까지 증가함에 따라 PLT 박막의 유전 상수는 360부터 650까지 증가하였고 100kV/cm 전기장하에서의 누설전류도 $4{\times}10^{-5}$에서 $4{\times}10_{-8}A/cm^2$로 향상되었다. Perovskite lanthanum doped lead titanate ($(Pb,La)TiO_{3}$ or PLT) thin films were successfully fabricated on Pt/TijSiO.iSi substrates at the temperatures as low as $440~500^{\circ}C$ by eleclron cyclotron resonance plasma-enhanced chemical vapor deposition (ECR PECVII). Since the volatilities of the MC sources arid oxide molecules (especially Ph oxide) increased with increasing deposition temperature, the film deposition rate and the (I'b + La)/'Ti ratio decreased Stoichiometric perovskite PL'T films with good dielectric and leakeage current properties were obtained at the temperatures of $460~480^{\circ}C$. The lanthanum content of the film was nearly directly propotional to $La(DPM)_{3}$ flow rate. As the La/Ti ratio increased from 3.0 to 9.5%, the dielectric constant increased from 360 to 650 and the leakeage current density at 100kV/cm electric field decreased from $4{\times}10^{-5}$ to $4{\times}10_{-8}A/cm^2$.

ECR PECVD법에 의한 페로브스카이트상(Pb, La)$\textrm{TiO}_3$ 박막 증착 연구

정성웅,박혜련,이원종,Jeong, Seong-Ung,Park, Hye-Ryeon,Lee, Won-Jong 한국재료학회 1997 한국재료학회지 Vol.7 No.1

ECR PECVD법에 의해 $Pt/Ti/SiO_{2}/Si$ 다층 기판 위에 $480^{\circ}C$에서 순수한 페로브스카이트상의 PLT박막을 증착하였다. PLT 박막 증착전 ECR산소 플라즈마내에서의 $Pb(DPM)_{2}$ pre-flowing처리는 $Pb(DPM)_{2}$의 공급을 안정화시켜주며 박막증착초기에 Pb성분이 풍부한 분위기를 조성해 줌으로써 페로브스카이트 핵생성을 용이하게 하여 PLT박막 특성을 향상시켰다. Ti-source 유입량을 변화시킬 때 PLT박막의 증착특성, 조성, 결정상 그리고 전기적 특성을 관찰하였다. PLT박막은(100)으로 우선 배향되었으며 화학양론비가 잘 맞는 경우 높은 페로브스카이트 X-선 회절강도와 높은 유전율을 나타내었다. Single phase pero~~skite lead lanthanum titanate thin films were fabricated on $Pt/Ti/SiO_2/Si$ substrates at the temperature of $480^{\circ}C$ by electron cyclotron resonance plasma-enhanced chemical vapor deposition (ECR PECVD) using metal organic sources $Pb(DPM)_2$ pre-flowing treatment in ECIi oxygen plasma before fabricating PLT films 11romote the perovskite nucleation due to stable supplying of the $Pb(DPM)_2$ and providing the F'h-rich atmosphere in the early stage of deposition. $Pb(DPM)_2$ pie-flonring treatment enhanced the properties of PLT films. The charactcristics of the PLT filrris were investigated as a tunction of the flow rate of Ti-source. The PL'i' films were grown in a perovskite structure tvith (100) preferred orientation. The high X-ray diffraction intensity and dielectric constant were obtained from the stoichiometric perovskite $(Pb,La)TiO_3$.

The Effectiveness of Experiential Hygiene Education on the Attitudes Toward and Practice of Personal Hygiene Among the Lower Grade Elementary School Students

박소연(So Yeon Park),박혜련(Hye-Ryeon Park) 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.11

목적 본 연구는 체험위생교육이 초등 저학년 아동의 개인위생 태도와 실천에 미치는 효과를 검증하기 위한 중재연구이다. 방법 2020년 7월 16일부터 7월 23일까지 지역아동센터에 방문한 초등 저학년 아동 16명을 대상으로 자료 수집 및 중재를 실시하였다. 수집한 자료는 SPSS/WIN 21.0을 이용하여 분석하였다. 결과 효과를 검증한 결과 체험위생교육 후 개인위생에 대한 인식(t=4.39, p=.001), 손위생 태도(t=6.70, p<.001)와 실천정도(t=3.02, p=.009), 마스크 착용 실천 정도(t=7.04, p<.001)가 유의한 수준으로 향상된 것으로 나타났다. 결론 본 연구에서 개발한 체험위생교육은 초등 저학년 아동의 손위생 및 마스크 착용 등 개인위생의 태도와 실천에 영향을 미치는 프로그램으로 사용할 수 있을 것이다. Objectives This study was an interventional study verifying the effects of experiential hygiene education on lower grade of elementary school student’s personal hygiene attitudes and practices Methods In July 2020, data collection and intervention were conducted among 16 lower grade lower grade elementary students who visited the regional children's center and participated in experiential hygiene education. The data was analyzed using SPSS/WIN 21.0. Results The analysis showed that the perception of personal hygiene after experiential hygiene education (t = 4.39, p = .001), attitude toward hand hygiene (t = 6.70, p < .001), and degree of practice of hand hygiene (t = 3.02, p = .009) and wearing a mask (t = 7.04, p < .001) were significantly improved. Conclusions The experiential hygiene education program developed in this study can be used to influence the attitudes toward and practice of personal hygiene, such as hand hygiene and wearing masks, in lower grade elementary students.

카카오톡 쿼리로 바라본 SQLite의 쓰기 패턴 분석

이황교(Hwanggyo Lee),박혜련(Hye-ryeon Park),오정훈(Jeong-hun Oh),오기환(Gihwan Oh),이상원(Sang-won Lee) 한국정보과학회 2014 한국정보과학회 학술발표논문집 Vol.2014 No.12

간호대학생의 아동 호스피스.완화의료에 대한 지식, 태도 및 인식

박소연(So Yeon Park),박혜련(Hye-Ryeon Park) 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.2

목적 본 연구는 간호대학생의 아동 호스피스⋅완화의료에 대한 지식, 태도 및 인식을 파악하기 위해 실시하였다. 방법 2021년 8월에서 9월까지 간호대학생 96명을 대상으로 자료를 수집하였다. 간호대학생의 아동 호스피스⋅완화의료에 대한 지식과 태도는 7점 척도로 구성된 20문항으로, 인식은 4점 척도로 구성된 20문항으로 조사하였다. 수집한 자료는 SPSS/WIN 21.0을 이용하여 분석하였다. 결과 간호대학생의 지식과 태도는 각각 4.7점과 5.1점이었으며 인식은 3.2점으로 나타났다. 간호대학생의 완화의료 관련 교육 경험에 따라 호스피스⋅완화의료에 대한 태도(t=2.85, p=.005)와 인식(t=2.93, p=.004)에 차이가 있었으며, 완화의료 관련 교육이 필요하다고 응답한 경우 호스피스⋅완화의료에 대한 태도(t=5.47, p<.001)가 긍정적인 것으로 나타났다. 아동 호스피스⋅완화의료에 대한 지식은 태도(r=.32 p=.002)와 인식(r=.27 p=.009)과 유의한 상관이 있는 것으로 나타났으며, 태도는 인식(r=.27 p=.009) 과 유의한 상관이 있는 것으로 나타났다. 결론 간호대학생의 아동의 호스피스⋅완화의료에 대한 지식과 태도를 높이고 인식을 개선하기 위해서는 표준화된 교육이 필요하다. Objectives This study is a basic study to understand the knowledge, attitudes and perceptions of nursing students about hospice and palliative care for children. Methods Data were collected from 96 nursing students from August to September 2021. A structured questionnaire was used for data collection, and knowledge and attitude consisted of a total of 20 items on a 7-point scale, and perception on a 20 item 4-point scale. The collected data were analyzed using SPSS/WIN 21.0. Results Knowledge and attitude were 4.7 and 5.1, and perception was 3.2. There were differences in the attitudes( t=2.85, p=.005) and perceptions(t=2.93, p=.004) of hospice and palliative care according to the nursing students experiences in palliative nursing education. Knowledge of child hospice and palliative care was found to have a significant correlation with attitude (r=.32 p=.002) and perception (r=.27 p=.009). Attitude was found to have a significant correlation with perception (r=.27 p=.009). Conclusions Standardized education is needed to increase children s knowledge and attitudes towards hospice and palliative care and to improve their awareness.

노인의 연명의료 의향 영향요인

황윤희(Yun Hee Hwang),전혜정(Hye Jung Jun),박혜련(Hye-Ryeon Park) 한국노인간호학회 2022 노인간호학회지 Vol.24 No.4

Purpose: The purpose of this study was to identify the intention to use life-sustaining treatment for older adults living in a local community, and the factors that influence the intention to use life-sustaining treatment. Methods: A total of 9,555 older adults were selected and analyzed using 2020 National Survey of Older Koreans data. A Rao-Scott test was conducted to evaluate the differences in sociodemographics, health status, death preparation education experience, and life satisfaction according to intention to use life-sustaining treatment. Results: Economic status (odds ratio [OR]=1.38, 95% confidence interval [CI]=1.00~1.90), social support (OR=4.78, 95% CI=1.16~19.74), and life satisfaction (OR=1.53, 95% CI=1.12~2.09) were identified as significant influencing factors in the older adults’ life-sustaining treatment intentions. In other words, when satisfaction with economic conditions is moderate or low, when there is social support, and when life satisfaction is moderate, life-sustaining treatment intention was high. Conclusion: Education programs for life-sustaining treatment should be provided for older adults living in this community.