Piezoelectric Materials: All‐Solution‐Processed Flexible Thin Film Piezoelectric Nanogenerator (Adv. Mater. 45/2012)

Chung, Sung Yun,Kim, Sunyoung,Lee, Ju‐,Hyuck,Kim, Kyongjun,Kim, Sang‐,Woo,Kang, Chong‐,Yun,Yoon, Seok‐,Jin,Kim, Youn Sang WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.45

<P>An all‐solution‐processed flexible piezoelectric nanogenerator, composed of polycrystalline ZnO thin film and functional polymer layers such as P3HT/PCBM and PEDOT:PSS, generates energy through a mechanical rolling and muscle stretching system. On page 6022, Youn Sang Kim, Sang‐Woo Kim, and co‐workers show that this all‐solution‐processed nanogenerator is feasible as a piezoelectric patchable device and is promising for use in future energy harvesters such as wearable human patches and mobile electronics. </P>

브라켓 부착을 위한 변형된 레이저 부식법

윤민성,이상민,양병호 대한치과교정학회 2010 대한치과교정학회지 Vol.40 No.2

전단결합강도를 강화하기 위해 레이저를 이용한 부식과 산을 이용한 부식의 비교 연구가 많이 진행되어왔다. 본 연구에서는 Er,Cr:YSGG laser와 전통적인 산부식법을 혼합한 방법의 전단결합강도의 변화에 대한 평가를 하고자 한다. 교정적인 목적으로 발치된 64개의 건전한 소구치를 이용하여 16개씩 4개의 군으로 나누었다. 첫 번째 군은 37% 인산을 15초 적용시키는 전통적인 부식 방법을 택하였고, 두 번째 군은 물방울레이저로 1.5 W로 10초간 부식시킨 후 전통적인 산부식 방법을 시행하였다. 세 번째 군은 두 번째 군과 같지만 산부식을 먼저 시행한 후 물방울레이저로 부식시켰다. 네 번째 군은 물방울레이저를 이용하여 1.5 W로 15초간 부식시켰다. 이후 전단결합강도의 측정 및 치아 표면의 특징 관찰, 그리고 접착제잔류지수를 평가하였다. 두 번째, 세 번째 군은 첫 번째, 네 번째 군에 대하여 전단결합강도가 높게 측정되었다. 하지만 두 가지 기법의 복합사용 순서를 달리한 두 번째, 세 번째 군 사이에는 통계적으로 유의한 차이가 나지 않았다. 기존 산부식을 이용한 브라켓 접착법보다 산부식과 Er,Cr:YSGG laser를 복합적으로 사용 시, 향상된 전단결합강도를 얻을 수 있다. Objective: Many studies have carried out research on comparisons between laser etching and conventional etching systems to investigate methods of reinforcing shear bond strength. The purposes of this study were to assess the efficiency of bonding with erbium, chromium doped: yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser etching combined with the conventional etching technique. Methods: Sixty-four sound premolars, extracted for orthodontic purposes, were randomly divided into 4 groups and treated in the following manner. First group, conventional etching of 37% phosphoric acid for 15 seconds (control); second group, 1.5 W laser etching for 10 seconds followed by conventional etching; third group, conventional etching followed by 1.5 W laser etching; fourth group, 1.5 W laser etching for 15 seconds only. We assessed the shear bond strength, the surface characteristics, and the adhesive remnant index scores between all groups. Results: Experimental groups showed higher shear bond strength than the control group. But no statistically significant differences were found between the second and third groups. Adhesive remnant scores were compared with the Kruskal-Wallis test, and no statistically significant differences were found between all groups. Conclusions: To obtain maximum shear bonding strength, a combined technique of Er,Cr:YSGG and 37% phosphoric acid is useful even though it may be inconvenient.

화성(華城)의 안내해설판 이용에 관한 탐색적 연구

윤상헌 경기대학교 화성학연구소 2004 화성학연구 Vol.- No.1

This article deals with visitor's perception and use of interpretive signs in Suwon Hwaseong Fortress which is registered as world heritage by UNESCO World Heritage Center. To obtain data onsite inspection and survey was performed. As a result, visitor's perception and use of interpretive signs was low. But on the relationship between use and satisfaction of interpretive signs, if visitor is active user for interpretive signs and can understand contents of interpretive signs very well, visitor's satisfaction is much higher. This result explains that if interpretive signs are located properly and contents of interpretive signs are written easier to understand, visitor's perception of Suwon Hwaseong Fortress and satisfaction will be high.

결합비를 조정할 수 있는 광 결합기에 관한 연구

尹星鉉,鄭萬永 東亞大學校 大學院 1989 大學院論文集 Vol.14 No.-

When optical coupler is fabrecated with the polished single mode potical fiber, coupling ratio is controlled by the off α set of the coupler block. that caused the effective coupling length. In this paper, we propose the condition that coupling ratio is 0%, 50%, 100% by the effective coupling length.

京畿道 廣州郡 및 富川郡에 있어서의 肺디스토마의 疫學的 調査

尹德鎭,金元撤,全世鍾,李俊鎬,金燉均,尹燾善,南相德 대한의학협회 1965 대한의학협회지 Vol.8 No.9

전자정부 성숙도 평가모형의 개발과 적용에 관한 연구

윤상오 한국정책학회 2002 韓國政策學會報 Vol.11 No.4

본 연구는 전자정부 발전단계에 대한 경험적·객관적인 진단과 향후 정책방향 제시를 위하여 전자정부 성숙도 평가모형을 설정하고 이를 실제 사례에 적용한 것이다. 성숙도 평가모형은 전자정부의 양대 이념인 민주성과 능률성 달성정도를 기준으로 '출발-진입-발전-고도화'의 4단계 모형으로 설정하였으며, 35개 중앙행정기관을 대상으로 실제 평가를 하였다. 평가결과 우리나라 중앙행정기관의 전자정부 성숙도는 아직까지 고도화 단계에 도달한 기관은 없으며 일부 기관이 발전단계에 도달하고 있으나 아직까지는 많은 기관들이 출발단계나 진입단계에 머물고 있는 것으로 나타났다. 따라서 향후 전자정부의 고도화를 위해서는 지속적인 관심과 정책적 노력이 있어야 할 것이며, 이와 함께 전자정부의 성숙도를 진단·평가하여 전자정부 구현노력에 긍정적 환류를 제공할 수 있도록 성숙도 평가모형도 계속적으로 수정·보완되어야 할 것이다. This study focused on developing the four stage eGovernment maturity model and applied it to evaluate eGovernment policy performance of government of this study implies the following. At first, the maturity of each government ministry is not hig, but it is in the middle of realizing the efficient and domocratic government. Secondly, to achieve a high level of eGovernment maturity, the view and mind of each ministry about informatization and eGovernment should be changed from the technology-oriented perspective to the organizational culture and human value oriented perspective. Finally, we must make continuous efforts to develop, test, modify and establish the general eGovernment maturity evaluation model which can diagnose the objective status of eGovernment maturity and suggest policy guidelines and directions for the more democratic and efficient government.

광대역 입력신호를 위한 선형 트랜스컨덕터와 Multiplier의 설계

尹暢焄,吳成根,辛烘圭,金東龍 全北大學校 1993 論文集 Vol.36 No.-

The linear transconductor and analog four-quadrant multiplier are designed. The DDA(differential difference amplifier) of new active component can be improved matching problems of external elements in op-amp application circuits. We have designed transconductor which have excellent linearity and is the most important block in DDA. And analog four-quadrant multiplier is designed using the designed transconductor and MOSIS 2㎛ design rule. We are simulated the linear transconductor and analog multiplier by SPICE program.

고혈압 환자들의 건강행태

김석범,강복수,윤성호,황정희,이경수 韓國保健敎育.健康增進學會 2000 보건교육건강증진학회지 Vol.17 No.1

This study was conducted to examine health behaviors in hypertensive patients and the factors that would affect these healthy life-styles, and to provide basic data for effective and continuous hypertension control in private medical facilities. Among those patients diagnosed as hypertension who had visited the Department of Internal Medicine of Yeungnam University Hospital during the two month period from August 2 to September 30, 1999, the present study included 222 patients who were in more than one month after the initial diagnosis of hypertension and those who had hypertension for less than 10 years. Using a structured questionnaire, the present study was conducted by a self-administered survey method, and the obtained data were analyzed with t-test, χ2-test and one-way analysis of variance using the SPSS statistical program. The scores on knowledge related to hypertension were higher as the education level of a patient was higher(p〈0.05). As for occupation, those who performed office or management jobs showed higher scores than those who were into manufacturing jobs, and as for economic status, although those patients who were in middle class showed highest scores, however, no statistical significance was observed. The scores of knowledge on hypertension was higher when the family history hypertension was present(p〈0.05). The scores of health-related behaviors were higher with higher education level and higher economic status, higher in those with family history of hypertension, and higher in those with office or management jobs than those who had manufacturing jobs(p〈0.05). Blood pressure measurement on regular basis was performed most frequently in those who were between 50∼59 years old with 83.3% and was least frequent in those who were older than 70 years old with 50%(p〈0.05). The frequency of regular blood pressure measurement was higher with higher education level, higher economic status, higher in those with family history of hypertension, and the highest in those with management position with 93.5%, however, on statistical significance was observed. Changes in health-relaxed behaviors after hypertension diagnosis were higher with higher education level, higher economic status, and in those patients performed office or management work. In particular, diet change was observed in female and higher economic status and smoking cessation was observed in 60∼69 years old. Housewives and office workers or managers have taken exercise more regularly and those who had management jobs and had high scores on knowledge related to hypertension would participate health education program more actively. Thus, for improving health-related behaviors for continuous management of hypertension, changes in health-related behaviors can be followed through conduction health education to improve understanding of knowledge related to hypertension as the method of helping to improve changes in health life-styles in those with little education and those in low economic status.

조리냉동 완자제품의 유통온도 및 품질 현황

윤성희,윤재영,이서래 이화여자대학교 생명과학연구소 1996 생명과학연구논문집 Vol.7 No.-

육류를 이용하여 완자모양으로 만든 조리 냉동식품의 유통과정에서의 품질 현황을 알아 보고자 서울시 전역에서 시장 점유율이 높은 D,B회사 제품 81개와 이들 제품에 비해 원료육 함량이 높고 유통기간이 짧은 M회사 제품 36개를 1995년 5-9월 중 수집하여 신선도 지표인 VBN 함량, TBA값, pH와 metmyoglobin 비율을 측정하였다. 대부분의 시료는 양호한 품질을 유지하고 있었으나, M회사의 1개 시료는 VBN 함량이 32.5㎎%, TBA값이 0.65㎎/㎏으로 초기 부패 단계에 들어서 있었다. Metmyoglobin 비율과 TBA값 사이에는 높은 정(正)의 상관관계를 보여, 지방질 산화와 육색소 산화간에는 깊은 관련이 있는 것으로 나타났다. 시료들의 냉동보관 온도는 -18℃이하의 경우는 18%에 불과했고, -14℃ 이상의 경우는 35%나 되었다. 초기부패 징후를 나타낸 시료의 보관온도는 -10℃이었으며 보관온도가 높은 시료일수록 높은 VBN함량, TBA값, metmyoglobin 비율, pH를 나타냈다. 잔여 유통기간과 이들 품질인자 간에는 서로 부(負)의 상관관계를 보여 시중에 유통된 기간이 긴 시료일수록 높은 수치를 나타냈다. 냉동식품의 유통기간 중 좋은 품질을 유지하기 위해서는 법정온도인 -18℃에서의 보관이 필수적이므로 판매자와 소비자가 이 조건을 지킬 수 있도록 적절한 교육과 홍보가 요구된다. In order to investigate the quality status of fried-frozen Korean meat ball products during retail distribution, VBN value, TBA value, pH and metmyoglobin ratio were determined for 117 samples collected in Seoul area during the period of May to September, 1995. Most samples maintained relatively good quality, but one sample of a company showed 32.5㎎% VBN value and 0.65㎎/㎏ of TBA value which indicate the early stage of spoilage. Correlation coefficient between metmyoglobin ratio and TBA value was highly significant. Samples closer to shelf-life limit tended to show higher VBN value, TBA value, metmyoglobin ratio and pH. Out of the surveyed samples, 35% were on retail shelves of temperature above -14℃, while only 18% were being sold at temperature below -18℃. It is concluded that prepared frozen foods should be stored at the recommended temperature of -18℃.

흰쥐 피부의 11β-hydroxysteroid dehydrogenase 분포양상

류시윤,정규식,김성호 대한해부학회 1996 Anatomy & Cell Biology Vol.29 No.4