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        • KCI등재

          Acrylate를 결합제로 사용한 수계 테이프 캐스팅에서 알루미나 슬러리의 분산 및 점성 특성

          조유정,박일석,문주호,김대준,Cho, Yu-Jeong,Park, Il-Seok,Moon, Joo-Ho,Kim, Dae-Joon 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.2

          Acrylate 수계 결합제를 사용한 알루미나 테이프 캐스팅용 슬러리의 완전분산을 위한 최적의 분산제와 분산제량을 결정하기 위해 침강실험, 분말 함유량 실험, 점도 및 zeta 전위 측정을 행하였다. 알루미나 슬러리의 완전분산은 분산제를 polycarboxylic acid로 했을 때 얻어졌으며, 최적의 첨가량은 알루미나 100에 대하여 0.23∼0.24g 이었다. 분말에 대한 분산제량이 증가할수록 분산은 잘 이루어졌으나, 일정량 이상이 첨가되면 분산제가 용매 안에 과잉으로 존재하여 분산을 저해하는 요인으로 작용하였다. 테이프 캐스팅용 슬러리는 100g의 알루미나 분말에 0.2g의 polycarboxylic acid를 첨가하였을 때 분산 및 테이프 특성이 가장 우수하였고, 이 때 혼합한 결합제는 acrylate였고, 가소제는 Benzoflex를 사용하였다. 이 때 슬러리 최적 점도는 약 570 cps였고, 테이프 내 알루미나 량은 57 vol%이었다. Measurements of sedimentation, solid loading, zeta potential, and viscosity were employed to determine a proper dispersant and its amount for a well dispersed alumina powders in aqueous alumina tape casting using acrylate as a binder. Polycarboxylic acid was the most effective one among various dispersants considered in the present study and its amount was 0.23∼0.24 g per 100 g alumina for a dispersion. Better dispersion was obtained as an increase of dispersant addition. However, the dispersion was hindered as the amount of dispersant was higher than the optimum amount because of bridging or tangling of polymer chains. Excellent aqueous alumina tapes were prepared from the slurry containing the optimum amount of the polycarboxylic acid (0.2g), alumina powders(100 g), acrylate and Benzoflex as binder and plasticizer, respectively. The viscosity of the slurry was 570 cps and the alumina loading in the tape was 57 vol%.

        • KCI등재

          다공성 티타늄 임플란트의 생체적합성 증진을 위한 복합 표면처리에 관한 연구

          조유정,김영훈,장형순,강태주,이원희,Cho, Yu-Jeong,Kim, Yung-Hoon,Jang, Hyoung-Soon,Kang, Tae-Ju,Lee, Won-Hee 한국재료학회 2008 한국재료학회지 Vol.18 No.5

          Porous Ti implant samples were fabricated by the sintering of spherical Ti powders in a high vacuum furnace. To increase their surface area and biocompatibility, anodic oxidation and a hydrothermal treatment were then applied. Electrolytes in a mixture of glycerophosphate and calcium acetate were used for the anodizing treatment. The resulting oxide layer was found to have precipitated in the phase form of anatase $TiO_2$ and nano-scaled hydroxyapatite on the porous Ti implant surface. The porous Ti implant can be modified via an anodic oxidation method and a hydrothermal treatment for the enhancement of the bioactivity, and current multi-surface treatments can be applied for use in a dental implant system.

        • KCI등재

          원저 : 비만 초등학생들의 자아존중감 및 불안에 대한 고찰

          조유정 ( Yu Jeong Cho ),김은주 ( Eun Joo Kim ),조재흥 ( Jae Heung Cho ),정원석 ( Won Seok Jung ),송미연 ( Mi Yeon Song ) 한방비만학회 2010 한방비만학회지 Vol.10 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This study was performed to figure out relations of self-esteem, anxiety and the other factors related with obesity in obese children. Methods Forty-two children(21 boys and 21 girls) those who were diagnosed obesity have been recruited. To assess psychological factors, Self-esteem inventory(SEI), Revised Children``s Manifest Anxiety Scale(RCMAS), International Physical Activity Questionnaires(IPAQ), Korean Eating Attitudes Test(KEAT-26) and Children``s Depression Inventory(CDI) were administered. Behavioral characteristics were also analyzed. Results Self-esteem(SEI) had significant positive relationship with physical activity(IPAQ) and sleeping time. Self-esteem had significant negative relationship with anxiety(RCMAS), eating disorder(KEAT-26) and watching TV time. Anxiety had significant positive relationship with eating disorder(KEAT-26) and watching TV time, and negative relationship with physical activity(IPAQ) and sleeping time. All of participants seemed to be having depressive tendency. Conclusion Self-esteem and anxiety were significantly related. And eating disorder, physical activity, sleeping time and watching tv also affected to the self-esteem and anxiety of obese children.

        • KCI등재후보

          원저 : 한국 비만 및 과체중 여성에서 내장 지방과 신체 활동 사이의 연관성

          조유정 ( Yu Jeong Cho ),이아라 ( A Ra Lee ),황미자 ( Mi Ja Hwang ),정원석 ( Won Suk Chung ),송미연 ( Mi Yeon Song ) 한방비만학회 2008 한방비만학회지 Vol.8 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          Objectives Physical activity is known to be beneficial to prevent weight gain and to be physically healthy. In this study, we tried to find out the relationship between body composition with physical activity. Methods International Physical Activity Questionnaire(IPAQ)-short form was given to premenopausal women aged 20~55 and BMI≥23 kg/m2. Subcutaneous and visceral adipose tissue of the subjects by CT scanning was obtainedin a single slice. They were given written consent and this study is performed under the permission of institutional review board of Kyung Hee East-west Neo Medical Center. Results The mean of physical activity of total subjects was 1935.18 MET-min/week(n=63). When three groups of physical activity pattern(inactive, minimally active, and HEPA(Health-enhancing physical activity) active) was analyzed, all of them were heavily relied on the activity intensities of walking. The VSR(visceral/Subcutaneous adipose tissue Ratio) was correlated with total physical activity in vigorous activity group. Conclusions The physical activity of Korean obese and overweight women was on the average, but the vigorous activity is thought to be necessary. The vigorous physical activity was related with visceral adipose tissue.

        • KCI등재후보

          원저 : 비만 및 과체중 성인 여성에서 한방비만변증과 생활 습관 및 심리적 요인 간의 상관관계

          조유정 ( Yu Jeong Cho ),이아라 ( A Ra Lee ),황미자 ( Mi Ja Hwang ),송미연 ( M Yeon Song ) 한방비만학회 2011 한방비만학회지 Vol.11 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          The aim of the study was to investigate the relationship between oriental obesity pattern, life habitual factors(eating attitude, physical activity) and psychological factors(depression, stress, self-esteem) in korean obese and overweight women. Methods This study was performed in obese and overweight(BMI ≥ 23 kg/m2) women in Korea (n=56). Simple anthropometry including weight, BMI, waist circumference, BIA(bioelectrical impedance analysis) were done. To assess psychological factors, the Rosenberg self-esteem scale (SES) questionnaire, Beck depression inventory (BDI) questionnaire and stress response inventory (SRI) questionnaire were administered. Regarding diet, Korean eating attitude test(KEAT-26) was done. International physical activity questionnaire(IPAQ) was administered for exercise and physical activity intensity and quantities. All values were verified using correlation analysis. Results 1. The subjects had stagnation of the liver qi>food accumulation>yang deficiency>blood stasis>spleen vacuity in the order. 2. Stagnation of the liver qi score had significant relationships with self-esteem(r=-0.520, p<0.05) and depression(r=0.688, p<0.01) in stagnation of the liver qi group. There was a relationship between food accumulation score and eating attitude(r=0.784, p<0.01) in food accumulation group. 3. Lean mass had a significant relationship with self-esteem(r=0.434, p<0.05) fat mass had a significant relationship with stress (r=0.633, p<0.01) and in stagnation of the liver qi group. 4. Physical activity had significant relationships with lean mass(r=0.628, p<0.01) and with fat mass(r=-0.478, p<0.05) in group. Conclusions This study maintained that psychological factors play major roles in obesity with symptoms of stagnation of the liver qi and life habit(dietary factors and physical activity) in food accumulation.

        • KCI등재

          원저 : 과체중인 소아에 있어서 아이라진 복용의 효과

          조유정 ( Yu Jeong Cho ),김은주 ( Eun Joo Kim ),양유정 ( You Jung Yang ),송미연 ( Mi Yeon Song ) 한방비만학회 2010 한방비만학회지 Vol.10 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          This study was performed to figure out the effects of I-razin in overweight children without any exercise or specific diet. Methods Twenty-eight children those who were diagnosed overweight have been recruited. They were randomly assigned treatment or control group under block randomization. Treatment group were treated with I-razin for 8 weeks, and control group were treated with placebo medication under same conditions. Anthropometry, fat computed tomography and blood test have been done before and after the treatment. Results Eleven subjects in treatment group and seventeen in control group were evaluated. BMI, waist circumference, glucose, total cholesterol, and triglyceride were decreased in the treatment group. And reduction of BMI, glucose, and triglyceride in the treatment group were greater than control group. But there was no statistically significance. No side effects have been notice during the study period and no adverse effect on liver has been observed. Conclusion This study could not demonstrate effect of I-razin compared with control group. However, treatment group has a tendency of weight loss without side effect. Additional studies with large population are thought to be necessary to clarify the effect of I-razin.

        • KCI등재

          만성 요통 환자의 하지 길이 부전과 요천추부 및 골반의 방사선학적 지표와의 관계

          조유정 ( Yu Jeong Cho ),정석희 ( Seok Hee Chung ),송미연 ( Mi Yeon Song ) 한방재활의학과학회 2010 한방재활의학과학회지 Vol.20 No.4

          Objectives :The biomechanical relationship of leg length discrepancy(LLD), lumbar lordosis, pelvic variance and degenerative scoliosis is one of the most important parameters when treat musculoskeletal disorders, however the reports are still controversial. The purpose of this study was to compare the relationships between the parameters and bothersomeness in subjects with chronic low back pain. Methods :Sixty female and eight male adults with non specific low back pain over 3 months were recruited. LLD was measured by tape measure method. Lumbar lordosis, lumbosacral angle and related pelvic parameters were measured using simple radiologic films of lumbosacral view. Results :Lumbar lordosis was significantly correlated to the lumbosacral angle, pelvic incidence and difference of the both iliac widths. Pelvic incidence had significant correlation with difference of the both iliac widths. And difference of both iliac widths was related with LLD by radiologic film. There was also significant correlation between the LLD by radiologic film and tape measurement. Visual analogue scale(chronic low back pain) of normal lordosis group was greater than hyperlordosis group. Conclusions :There were close biomechanical relationships between lumbar, pelvis, and lower extremity. But in order to determine the effect of structure on the chronic low back pain, global balance of musculoskeletal structure seems to be worth further researching.

        • KCI등재

          한국 비만 여성에서 비만 치료 전 후의 심리적 상관관계 분석

          조유정 ( Yu Jeong Cho ),이아라 ( A Ra Lee ),정원석 ( Won Seok Jung ),송미연 ( Mi Yeon Song ) 한방재활의학과학회 2009 한방재활의학과학회지 Vol.19 No.1

          Objectives: Psychological comorbidities are high in patients with obesity and are associated with a variety of medical and dietary problems. This study aims to examine the association between psychological factors and obesity. Methods: This study was performed in pre-menopausal obese(BMI ≥ 25 kg/m2, waist circumference ≥85 cm) women in Seoul, in 2008 (n=35). Every patient underwent the obesity treatment program. The program included dietary and exercise education, and abdominal mesotherapy for 6 weeks. Simple anthropometry including weight, BMI and Computed Tomography (CT) including Subcutaneous adipose tissue (SAT), Visceral adipose tissue (VAT) and Visceral adipose tissue/Subcutaneous adipose tissue ratio (VSR) were done. To assess psychological factors, the Rosenberg self-esteem scale (SES) questionnaire, Beck depression inventory (BDI) questionnaire and stress response inventory(SRI) questionnaire were administered. Results: 1. All of the obesity indicators (except VSR) decreased significantly after the obesity treatment program. 2. There was a significant relationship between self esteem (SES score) and visceral obesity (VAT and VSR) measured at the end of the program. 3. During the intervention, the more weight, BMI, and subcutaneous adipose tissue decreased, the more self-esteem (SES) increased. There was no relationship between depression (BDI) and obesity. And the change in stress response (SRI) was associated with the change of deep subcutaneous adipose tissue and total abdominal adipose tissue. Conclusions: This study proves that visceral obesity may contribute to low self-esteem, and there is a possibility that the other psychological factors could also be related with obesity in Korean obese women. Individualised antiobesity therapy may be required depending on the patient`s psychological characteristics and weight loss could be helpful in order to treat psychological problem in obese patients.

        • KCI등재

          Hydroxypropyl cellulose/TEMPO-산화 처리된 셀룰로오스나노섬유를 이용한 복합필름의 기계적 및 열적 특성

          조유정 ( Yu Jeong Jo ),조혜정 ( Hye Jung Cho ),전상진 ( Sang Jin Chun ),이선영 ( Sun Young Lee ) 한국목재공학회 2015 목재공학 Vol.43 No.6

          본 연구에서는 HPC (hydroxypropyl cellulose)와 TEMPO 산화된 셀룰로오스 나노섬유(Tempo-oxidized cellulose nanofibrils, TOCN)가 보강된 복합필름을 제조하였다. 복합필름의 기계적, 열적 특성을 관찰하기 위해 인장강도 및 열중량 분석기(TGA)를 측정하였다. HPC/TOCN 복합필름에서 TOCN의 함량이 1 wt%에서 5 wt%까지 증가할수록 인장강도와 인장탄성계수는 직선적으로 증가하는 경향을 보였다. 그러나 TGA 분석 결과, TOCN의 함량에 관계없이 HPC/TOCN 복합필름의 열 안정성은 거의 차이가 없었다. Hydroxypropyl cellulose (HPC) composite films filled with TEMPO-oxidized cellulose nanofibrils (TOCN) were prepared in this study. In order to investigate mechanical and thermal properties of HPC/TOCN composite films, tensile strength and thermogravimetric analysis (TGA) wer performed. As the loading level of TOCN increased, the tensile strength and modulus increased significantly. However, thermal stability of HPC/TOCN composite films was not related to the loading levels of the TOCN.

        • KCI등재

          논문 : 국가신용등급 변화의 영향과 시사점: 동아시아 주요국을 대상으로

          강삼모 ( Sam Mo Kang ),조유정 ( Yu Jeong Cho ) 명지대학교 금융지식연구소 2014 금융지식연구 Vol.12 No.3

          본 연구에서는 국가신용등급 변화의 영향을 살펴보기 위해서 한국을 포함하여 동아시아주요국을 대상으로 실증분석을 실시하였다. 우선 Kaminsky and Schmukler(2002)의 더미변수를 활용한 회귀분석 방법을 준용하여 분석한 결과 한국의 경우 국가신용등급이 주가나 환율에 큰 영향을 미친 것으로 나타났다. 그리고 1997년 외환위기를 한국과 함께 겪었던 태국과 인도네시아의 경우 국가신용등급의 변화는 주가에는 영향을 미쳤으나 환율에는 영향을 미치지 못한 것으로 분석되었다. 중국과 일본의 경우 국가신용등급의 변화는 주가와 환율에 영향을 미치지 못하였다. 이어진 event study에서는 국가신용등급 조정시점 전후로 환율 및 금리가 크게 변동하는 가운데, 국가신용등급 상향조정시에 하향조정시보다 환율 및 금리의 변동성이 상대적으로 더 큰 것으로 나타났다. 마지막으로 단순회귀분석을 통해 한국의 국가신용등급 변화가 환율변동성에 미치는 영향을 짚어보았다. 추정결과 국가신용등급의 상향조정은 환율의 변동성을 증가시키는 것으로 나타났다. 이상의 실증분석 결과를 종합해 보면 국가신용등급의 상향은 동아시아 국가 중에서도 한국에 가장 큰 영향을 미친 것으로 추론해 볼 수 있다. 이는 한국의 경우 국가신용등급 변화의 편익 못지않게 그 비용도 클 수 있음을 시사한다. 따라서 국가신용등급 상향조정에 대한 평가시 비용 측면을 추가로 감안하는 등 지금보다 균형 잡힌 시각으로 접근할 필요가 있다. In this study, the effects of changes in the country`s credit rating was investigated using East Asian countries` data. We conducted regression analysis using dummy variables as in Kaminsky and Schmukler(2002). In the case of Korea, the country`s credit rating has had a major impact on both stock prices and exchange rates. In the cases of Indonesia and Thailand, the country`s credit rating has affected the stock price but not exchange rates. However, in the cases of China and Japan, the country`s credit rating has had a major impact on neither stock prices nor exchange rates. On the other hand, event study results are as follows. The interest rates and exchange rates were significantly fluctuated by the changes in country`s credit rating. Finally, using a simple regression analysis, we found that the changes in South Korea`s sovereign credit rating increased the exchange rate volatility. In the case of Korea, we found the cost from the rise in the country`s credit rating. Therefore, Korean government needs to prepare some policies to lessen the cost of fast credit rating changes.

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