Zn ion의 영향에 따른 $(Y,\;Zn)_2O_3$:$Eu^{3+}$ 적색 형광체의 발광특성

송영현,문지욱,박우정,윤대호,Song, Y.H.,Moon, J.W.,Park, W.J.,Yoon, D.H. 한국결정성장학회 2008 한국결정성장학회지 Vol.18 No.6

본 연구에서는 자외선 영역에서 발광하는 우수한 특성의 적색 형광체를 얻기 위하여 고상 반응법으로 air 분위기에서 $1200^{\circ}C$에서 6시간 동안 열처리하여 $(Y,\;Zn)_2O_3$:$Eu^{3+}$를 Zn 이온의 농도 변화에 따라 실험하였다. $(Y,\;Zn)_2O_3$:$Eu^{3+}$를 XRD에 의해 비교 분석한 결과 주요 peak들이 JCPDS card(No. 41-1105)와 거의 일치하는 것을 확인하였다. 그러나 Zn 이온치 농도가 5 mol% 이상일 때 XRD에서 ZnO의 peak이 관찰되는 것을 확인 하였다. 이로 인하여 Zn 이온의 농도가 5 mol% 이하일 때 불순물 상 없이 $Y_2O_3$ 구조에 잘 고용되는 것을 확인하였다. $(Y,\;Zn)_2O_3$:$Eu^{3+}$의 발광 peak은 여기 흡수 영역인 ${\lambda}ex=254\;nm$를 기준으로 612 nm 영역에서 $Eu^{3+}$ 이온의 $^5D_0{\rightarrow}^7F_2$에 전형적인 에너지 천이에 의해 가장 강한 발광 peak을 나타내는 것을 확인하였으나 Zn 이온의 농도가 10 mo1% 이상일 때 갑자기 발광 peak이 현저히 감소하는 것을 확인하였고 최대의 발광 peak을 가질 때 형광체의 조성은 $(Y_{0.95},\;Zn_{0.05})_2O_3$:$Eu^{3+}_{0.075}$이였고 입자 size는 $0.4{\sim}3{\mu}m$로 확인되었다. To enhance the luminescence properties, the red phosphor composed of $(Y,\;Zn)_2O_3$:$Eu^{3+}$ as doping concentration of Zn ion is synthesized at $1200^{\circ}C$ for 6 hrs in air atmosphere by conventional solid reaction method. As a result of the red phosphor $(Y,\;Zn)_2O_3$:$Eu^{3+}$ is measured X-ray diffraction (XRD), The main peak is nearly corresponded to the same as JCPDS card (No. 41-1105). When the doping concentration of Zn ion is more than 5 mol%, However, the ZnO peak is showed by XRD analysis. Therefore, when the doping concentration of Zn ion is less than 5 mol%, the Zn ion is well mixed in $Y_2O_3$ structure without the impurity phases. The photoluminescence (PL) properties is shown as this phosphor is excited in 254 nm region and the highest emission spectra of $(Y,\;Zn)_2O_3$:$Eu^{3+}$ has shown in 612 nm region because of a typical energy transition ($^5D_0{\rightarrow}^7F_2$) of $Eu^{3+}$ ion. As the doping concentration of Zn ion is more than 10 mol%, the emission peak is suddenly decreased. when the highest emission peak as doping concentration of Zn ion is shown, the composition of this phosphor is $(Y_{0.95},\;Zn_{0.05})_2O_3$:$Eu^{3+}_{0.075}$ and the particle size analyzed by FE-SEM is confirmed from 0.4 to $3{\mu}m$.

대학생의 인터넷중독 및 스마트폰 중독 정도와 미술 치료 인식에 대한 조사 연구

박혜원,송승윤,윤하영,이경현,이소영,이지원,진예은,최시온,허은서,황다빈,신주현,이인영 이화여자대학교 간호학회 2018 이화간호학회지 Vol.- No.52

Purpose: Investigate the level of Internet and smart phone addiction of college students and difference of their perception on the art therapy. Method: Data was collected using 4 categories of questionnaires. Participants of this study were 383 college students who are currently attending universities located in seoul, Kyung-Ki and Incheon. The Chi-square test, One-way Analysis of Variance, Scheffé test were performed using IBM SPSS Statistics 23.0 Result: First, the study has established that the status of attending universities, grade, people who living with, age affected the level of Internet addiction of college students. In terms of the level of smart phone addiction of college students, the status of attending universities, gender, age were the affective factors. Second, there was a significant difference on the perception of the advantages of the art therapy and the level of acknowledging it, depending on the level of Internet addiction. Finally, depending on the level of smartphone addiction, there was a significant difference in the level of perception of the art therapy, expectation toward the art therapy and the helpfulness of art therapy. The more the participants are close to the addicted level, the more they want to experience the art therapy. Conclusion: These results suggest. First, it is necessary to use bigger group of participants. Second, it is necessary to improve the research methods for college students. Third, nurse should offer holistic care toward the patients regarding their general characteristics by adapting this study. Finally, it is necessary to improve the art therapy programs for the college students who are addicted to the Internet and smartphone and to develop researches proving the effectiveness of these programs.

간호대학생의 에니어그램 성격유형에 따른스트레스 대처방식

김희주,박가영,박지영,송예빈,심지현,이수연,이지영,장주희,정영민 이화여자대학교 간호과학대학 2011 이화간호학회지 Vol.- No.45

The purpose of this study is to analyze the relationship between stress coping behaviors and Enneagram personality types. The subject of the study is 342 college students who are attending 4-year nursing colleges in Seoul, Korea, and 198 students among them are qualified for the study. Typified statistical tools SPSS, chi-square, and ANOVA are used as analyzing methods in the study. The research results are as follows: 1. In nursing students, freshman class is the highest population in the study with 63 students(31.82 %), and the highest percentage of population does not have a religion(89 students, 44.95 %). 120 students (60.61 %) answered that their interpersonal relationships are good, and 105 students(53.03 %) are satisfied with the nursing major. 2. In Enneagram personality type, 9 type is the highest(42.42 %). 3. Problem focused coping type is the highest in stress coping behaviors(28.12(±20.16) points). 4. Problem focused coping behavior and social support coping behavior show significance. 5. Social support coping behavior shows significance, and 3 type scored the highest(17.67(±2.66) points). Further studies are suggested based on above results: First, in order to achieve more accurate results, the research of Enneagram and stress coping behavior with representative for sample Korean nursing students is necessary. Second, Development and verification the effect of stress coping program based on Enneagram personality types among nursing students are necessary.

Photoluminescence properties and synthesis of nano-sized YAG: Ce3+ phosphor via novel synthesis method

Y.H. Song,T.Y. Choi,마사키타카키,K. Senthil,윤대호 한국물리학회 2012 Current Applied Physics Vol.12 No.2

This study reports an approach for enhancing the luminescent properties of Y3Al5O12: Ce3+0.07 using an organic compound precursor. The Y3Al5O12: Ce3=0.07 nano-sized phosphors had a relatively uniform particle size, approximately 50e80 nm, when sintered at 1200 ℃ for 1 h. The photoluminescence results showed the maximum peak intensity when the concentration of Ce3+ ions was 0.07 mol. The results suggest that nano-sized phosphors synthesized from organic compound precursors can be used as alternative efficiency emitting phosphors in the LED applications.

Photoluminescence properties and synthesis of nano-sized YAG: Ce³⁺ phosphor via novel synthesis method

Song, Y.H.,Choi, T.Y.,Masaki, T.,Senthil, K.,Yoon, D.H. Elsevier 2012 CURRENT APPLIED PHYSICS Vol.12 No.2

This study reports an approach for enhancing the luminescent properties of Y<SUB>3</SUB>Al<SUB>5</SUB>O<SUB>12</SUB>: Ce<SUP>3+</SUP><SUB>0.07</SUB> using an organic compound precursor. The Y<SUB>3</SUB>Al<SUB>5</SUB>O<SUB>12</SUB>: Ce<SUP>3+</SUP><SUB>0.07</SUB> nano-sized phosphors had a relatively uniform particle size, approximately 50-80 nm, when sintered at 1200 <SUP>o</SUP>C for 1 h. The photoluminescence results showed the maximum peak intensity when the concentration of Ce<SUP>3+</SUP> ions was 0.07 mol. The results suggest that nano-sized phosphors synthesized from organic compound precursors can be used as alternative efficiency emitting phosphors in the LED applications.

Bi_2Sr_2Ca_1-xNa_xCu_2O_8+y 산화물 고온초전도체의 Ca 위치에 Na치환 효과

이민수,송승용,이종용,송기영,최봉수 대전산업대학교 반도체기술연구소 1999 半導體技術硏究所報 Vol.1 No.-

산화물 고온초전도체의 초전도성은 Cu-O면의 hole 농도와 밀접한 상호관계를 갖고 있음이 잘 알려져있다. 그러므로 본 연구에서는 Cu-O면의 hole 농도를 변화시키기 위해, Bi계 2212상(80K 상)의 구조안에 있는 +2가인 Ca 위치에 +1가의 알카리 원소를 치환하였다. 즉, Cu-O면의 hole 농도를 변화시킴에 따른 초전도성의 변화 및 초전도체의 결정구조 변화를 조사하였다. 그 결과 Ca 위치에 Na를 치환한 고용한계는 x<0.3이었다. 시료 안의 Na 치환량을 증가시킴에 따라 임계온도 T_c 와 hole 농도는 점차 증가하여 최대값을 갖은 후 서서히 감소 되었고, Na 치환량 x>-0.7 이상에서는 금속 - 반도체 전이현상이 관찰되었다. 또한 Na 치환의 고용한계내에서 결정상수 c^-축은 점차 감소하였고, a,b- 축은 점차 증가되는 경향을 보였다. The samples of Bi_2Sr_2Ca_1-xNa_xCu_2O_8+y with various carrier concentration were synthesized by substituting Na for Ca ion. The superconducting properties, hall coefficients and X-ray powder diffraction were measured the samples. Single phase samples were obtained for 0<-x0.3 of Bi_2Sr_2Ca_1-xNa_xCu_2O_8+y. In the single phase, the critical temperature T_c and carrier concentration increase with the increase of Na concentration pass through a maximum and then decreases. In the range of x>-0.7 to the Na doped samples, howerever, we observed the metal-semiconductor transition. The c-axis seemed to decrease and a, and b-axes increase with increasing Na concentration in the single phase. Decreasing of c-axis while increasing x is due to the smaller size of Na^-1 ions to the Ca+2 ions. In the range of x>0.3 however, the trend becomes ambiguous due to the inclusion of the 10 K phase and impurity phase.

계분과 당밀을 첨가한 볏짚 Silage 의 품질과 사료적 가치 1 . Silage 의 발효 품질

고영두(Y . D . Ko),송영민(Y . M . Song),곽종형(C . H . Kwack),김두환(D . H . Kim) 한국축산학회 1991 한국축산학회지 Vol.33 No.3

This study was carried out to increase nutritional value of rice straw as a ruminant roughage. Rice straw with different formular of broiler manure and liquid molasses was ensiled and evaluated by laboratory method. Rice straw was mixed at three levels of broiler manure(20, 30 and 40%, w/w) and with three levels of molasses(0, 5 and 10%, w/w). To evaluate the characteristics of silage fermentation, effects of broiler manure and molasses on chemical composition, pH, nitrogen contents, fermentation acids and microflora of the silage were measured. The results obtained are summarized as follows; 1. In the silages without molasses, crude protein, ether extract, NDF, ADF, total-N, acetic acid and lactic acid were decreased as the level of broiler manure was increased, while pH, crude fiber, NFE, NH₃-N and butyric acid were increased. 2. In the silages with both broiler manure and molasses, the contents of crude protein and ether extract were increased as the broiler manure and molasses were increased up to 40% and 5%, respectively, while the contents of crude fiber and NFE were decreased. With the silage with higher level of molasses, contents of NDF, ADF, acetic acid, lactic acid and total-N were increased, while the contents of moisture, butyric acid and NH₃-N were decreased. 3. Significant correlation coefficients were found between crude protein and NH₃-N (r=-.60**), crude protein and pH (r=-.82*), crude protein and lactic acid (r=.82**), crude protein and acetic acid (r=.53**), NH₃-N and lactic acid (r=-.63**), NH₃-N and acetic acid (r=-.48*), pH and lactic acid (r=-.82**), pH and acetic acid (r=-.55**), and pH and NH₃-N (r=.87**). 4. In order to estimate crude protein (Y^_ep), lactic acid (Y^_L) and pff (Y^_PH) with the levels of broiler manure (X1) and the levels of molasses (X2), the following multiple regression equations were drawn; Y^_cp = 11.236 + .047 X1 + .563 X2 (R²=.547 with X1, .549 with X2) Y^_L = 1.992 - .019 X1 + .310 X2 (R²=.794 with X1, .790 with X2) Y^_PH = 4.290 - .033 X1 - .127 X2 (R²=.619 with X1, .493 with X2) 5. The silages with broiler manure and molasses produced 10^5-6 cells/g silage total viable bacteria and 10^8-9 cells/g silage lactic acid bacteria. The numbers of both bacteria were increased ss the level of broiler manure and molasses were increased. The silages without molasses produced 10²cells/g silage coliform bacteria. However. the number of coliform bacteria was negative in the silages with molasses.

충청지역에서 발생한 쭈쭈가무시병의 임상상, 원인균의 혈청형 및 혈청역학적 연구

김선영,김윤성,박장규,윤태영,강재승,송인숙,최명식,최인학,차창룡,이우곤,박종우,이증훈,장우현,유영해,윤광혁,송계용 대한감염학회 1989 감염 Vol.21 No.2

From September to december 1987, eighty-six cases of tsutsugamushi disease were diagnosed by indirect immunofluorecent test or by isolating the causative agent in Chungcheung area. Their clinical features and patterns of antibody response to R. tsutsugamushi were analyzed. For the indenfication of prevalent antigenic types of R. tsutsugamushi in Chungcheung area, twenty-seven strains isolated were tested by indirect immunofluorescent test. To assess the extent of exposure to R.tsutsugamushi of a general population in Korea, the prevalence of antibody was investigated in 6,572 sera obtained from the residents of Chungcheung area by indirect immunofluorescent test. The female patients slightly outnumbered the male patients. More cases (68%) were older than 40 years of age. The epidemic peaked in October. The mean incubation period estimated was about 8 days. The major clinical features were fever and chill, headache, rash, eschar, and lymphadenopathy. Increased serm transaminase was the most singificant laboratory findings. Abnormalities in the chest roentgenography were often observed. The antibody titer rose rapidly 5 days after the onset, reached its peak at 20 days (1:640), and then declined agradually until 7 months(1:20). The seroype of 23 out of the 27 isolates wase found to be karp, one was Gilliam, and 3 isolates could not be classified by using polyclonal mouse hyperimmune sera. The prevalence of antibody to R.tsutsugamushi in the residents of Chungcheung area was 4.8%. The prevalence of antibody was higher in the female than in the male. The prevalence was higher in the residents of age above 40 years than below 40 years, and was the lowest in the children less than 10 years of age. Of the 318 positive sera from normal residents, only 2 sera showed the titers higher than 1:80.

200 GeV/핵자 유황이온과 핵건판핵의 충돌에 의해 생성된 헬륨 파쇄핵의 극한파쇄 연구

김동철,송진섭,윤천실,정성헌,박인곤,김종오,김철수,김태연,이승희,조재희,천병구,김재률,김준원,김태익,박명렬,장한일,임인택 慶尙大學校 기초과학연구소 1992 基礎科學硏究所報 Vol.8 No.-

고에너지 중이온 원자핵과 핵건판의 충돌에서, 200GeV/핵자 유황이온에 의해 생성된 파쇄 헬륨핵(Z=2)의 실험실계의 방출각 분포는 표적핵에 무관한 회귀공식. dN=exp[a+k exp(η-y_b)]d[exp(η-y_b)]로 잘 표현된다. 여기에서 의사신속도 η=-ln[tan(θ/2)]이고, y_b는 실험실계의 입사입자(^32S)의 신속도이다. 이 공식에 의한 적합에서 k=-0.057±0.008로 얻어진다. 즉, 핵건판과 고에너지 중이온의 충돌에서 파쇄 헬륨핵의 exp(η-y_b)의 분포는 "극한파쇄" 현상을 잘 설명하고 있다. The angular distribution of emission angle θ of helium (Z=2) produced in the collisions of incident particles of 200 GeV/nucleon ^32S in nuclear emulsion is well expressed by dN=exp[a+k exp(η-y_b)]d[exp(η-y_b)] where the pseudorapidity is η=-ln[tan(θ/2)], the laboratory system primary rapidity is y_b, and k=-0.057+0.008. The shape of this frequency of occurrence distributions in terms of exp(η-y_b) attests to the validity of the concept of "limiting fragmentation" for helium projectile fragments produced in the projectile fragmentation regions of heavy ion collisions in nuclear emulsion.

노인의 병원 선택 경험

김단비,김민지,김해솔,김희정,박윤선,손유경,송예진,유예림,이다예,이서영,이지현,강숙정,김부연 이화여자대학교간호학회 2020 이화간호학회지 Vol.- No.54

Purpose: The purpose of this descriptive study was to examine hospital choice factors among elderly patients to understand their experience and use as data to move towards senior-friendly hospitals. Methods: The individual in-depth interviews were conducted from August 13th to 18th, 2019. The participants consisted of eight senior citizens aged 65 and above that suffered from chronic illnesses and had regular hospital visits. Results: This study found that when elderly patients choose the hospital, they considered ‘awareness such as brand name of the hospital', ‘quality of medical service',‘convenience', ‘healthcare team / hospital employee', ‘personal experience', ‘children’s recommendation’ and etc,. The significant point was that all these factors were related to personal experiences from specific hospitals. Conclusion: This study analyzed the hospital choice factors of the elderly patients with high hospital utilization rates and found that the results were mainly affected by the distinct characteristics of elderly patients. The implications of this study are that we proposed further research directions and means for the improvement of the hospital. We suggest hospitals to increase labor allocation for elderly patients with difficulties dealing with unmanned systems such as kiosk and strengthen the role of healthcare providers as instructors for higher satisfaction.