Poly(vinyl alcohol) nanocomposites containing reduced graphene oxide coated with tannic acid for humidity sensor

Lim, Min-Young,Shin, Huiseob,Shin, Dong Myung,Lee, Sang-Soo,Lee, Jong-Chan Elsevier 2016 Polymer Vol.84 No.-

<P><B>Abstract</B></P> <P>Poly(vinyl alcohol) (PVA) nanocomposites were prepared by a solution casting method using a reduced graphene oxide coated with tannic acid (rGO-TA) as a filler. The rGO-TA was simply prepared by mixing tannic acid (TA) with graphene oxide (GO). The simple mixing process was found to be effective to reduce GO and to produce covalently-grafted TA layers on the reduced GO. The mechanical properties of PVA were much improved by the addition of rGO-TA because the TA layers increased the compatibility of the reduced GO with PVA matrix. For example, Young's modulus and elongation at break values of PVA were increased by 34.0 and 56.9%, respectively, by adding 1.0 wt% of rGO-TA. In addition, the PVA nanocomposites showed excellent humidity sensing properties over the wide relative humidity range and the long-term stability due to the conductive property of the reduced GO and the enhanced mechanical strength by the effective incorporation of rGO-TA into the PVA matrix.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The rGO-TA was prepared by a facile and green method using a low-cost tannic acid. </LI> <LI> The effect of rGO-TA on the properties of PVA nanocomposites has been studied. </LI> <LI> The rGO-TA improved the important properties for PVA-based humidity sensors. </LI> <LI> The PVA/rGO-TAs are promising materials for high-performance humidity sensors. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

아동 정신건강서비스에 대한 요구도 및 실제 이용에 관한 예비적 연구

김신영,조선미,임기영,정영기,신윤미 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.1

Objectives : We aimed to identily the degree of perceived need and use of child mental health services, and to examine the factors associated with the perceived need and use of the child mental health services. Methods : The sample consisted of 3,477 children aged 8 to 13 years. The parents completed the sociodemographic data, the Korean version of the Child Behavior Checklist (K-CBCL), and the Korean version of DuPaul's Attention Deficit Hyperacti-vity Disorder Rating Scale (K-ARS). Results : Overall, 10% of children demonstrated the need for mental health services, and 2.36% utilized the child mental health services. All subcategoiy scores of K-CBCL and K-ARS were significantly low in the no help needed group. Factor sassociated with the actual use ofchild mental health services included social problems and thought problems. Conclusion : The demand for child mental health services is high, but only a small number of children are using mental health services. To increase actual use, it is necessary to educate and campaign for various child mental health.

재발성 류마티즘 환자에서 발작의 유발인자

주유철,이동민,양종태,신병철,임태영,서정균,정기영,최동헌,김원,조영신,고희관 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.2

Background and Objectives : Palindromic rheumatism (PR) is known to be triggered without any obviously inciting events in most patients, although, in a few cases, attacks have been noted to relate to another events such as weather change, childbirth, ingestion of certain foods, or over-exercise. The aim of this study was to characterize the triggering factors on palindromic attacks. Materials and Methods : We evaluated sixty-four patients with PR for the presence of triggering factors and the relationship between attacks and triggering factors by interview of patients. We considered that there was an probable association between episodes and PR, if episodes within 24 hours prior to PR had triggered at least 50% of all attacks and a definite association between episodes and PR, if episodes within 24 hours prior to PR had triggered 100% of all attacks. Results : In 15 patients (35.9%), there was a possible association between episodes of PR and initiating events. In 8 patients (12.5%), there was a definite association between episodes of PR and initiating events. The triggering factors were physical over-activity including exercise (19/64: 29.7%), foods, such as rawfish, crab, and chicken, including alcohol (19/96: 19.8%). However, there were no difference between the groups with and without the triggering factor in sex ratio, duration and onset of PR, the positive rate of rheumatoid factor and involved sites. Conclusion : Our observations showed that PR was triggered by physical over-activity more than in previous reports and hypersensitivity to foods was a causative factor in some patients with PR. However, patients with triggering factors had a similiar clinical profile to patients without triggering factors.

지속가능한 주거환경평가지표에 관한 연구

임만택,김현태,김인호,박영신 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.1

The index of residential environment is an item that can be an axis of evaluation in evaluating residential environment and the level is a spatial measure indicated with a use of the index. This study is to examine the index of sustainable residential environment evaluation index. Sustainability can be classified into three different concepts: economic, environmental, and social. Economic sustainability indicates consideration of stable development of the city and regional economy in the future, environmental sustain ability indicates consideration of physical environment to prevent deterioration of future residential environments and social sustainability indicates consideration of preservation of culture and history in communities. The common question in these is how the people who live and act in each community contribute to their future community.

최승희 무용의상의 특성과 현대패션과의 상관성

임영자,박유신 복식문화학회 2000 服飾文化硏究 Vol.8 No.5

The purpose of this study is to discover the interrelationship between modern costumes and Seung-Hee Choi's dancing costumes in 1930s. Seung-Hee Choi, who was a dancing pioneer in Korea, introduced the modern dancing costumes for the first time in Korea. The results are as followed; First, we can find Eroticism in Choi's dancing dress. Choi's dancing costume had used gold thread, silver threads spangle, see-through and a half-naked body clothing that decorated with beads and cords. It is similar to modern costumes in ubjet mitter, silhouette, design, and so on, Second, the influence of Futurism was in her dancing costumes, that is, it represented asymmetry designs and rectilinear figures. Third, not only beauty but also a Functionalism was expressed in her dancing costumes. Functional beauty was shown through bias cut, pleats, slit, and so on.

급성 뇌졸중 환자의 경동맥 죽상경화반 표면 불균일성과 뇌졸중 예후 인자 및 기능적 예후의 연관성 평가: 예비 보고

박영태, 이혜림, 여민주, 김지선, 이성현, 이상수, 신동익 충북대학교 의학연구소 2016 忠北醫大學術誌 Vol.26 No.2

본문참고

관상동맥 질환에서 도플러 심초음파도로 측정한 확장기 좌심실기능의 지표와 혈역학적 소견과의 비교 검토

임헌관,기신영,유창범,최태명,김성구,권영주 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.1

Background : Left ventricular diastolic dysfunction is now recognized as a significant cause of cardiac symptoms even in patient with normal systolic ventricular function. During the last several years, the use of Doppler echocardiography for assessing left ventricular diastolic function has attracted increased attention. Doppler study have demonstrated that patients with ischemic heart disease have abnormal diastolic filling pattern suggesting impaired relaxation. Methods : This study was designed to correlate Doppler mitral flow velocity patterns and measuared variance with hemodynamic findings in 33 patients: 10 with myocardial infarction(group 1), 10 with angina pectoris(group 2) and 13 with no coronary disease(group 3). Results: 1. E/A ratio (0.87±0.24 m/sec versus 1.09±0.91 m/sec, P<0.05) was lower in group 1 than in group 3. 2. Significant correlation were demonstrated between pulmonary capillary wedge pressure (PCWP) and isovolumic relaxation time(IVRT) (r=-0.58; p<0.001), and E velocity (r=0.61; p<0.005). 3. IVRT was (61±30msec versus 92±35msec, p<0.05) shorter in patients with PCWP>10mmHg than in patients with PCWP≤10mmHg. Conclusion: Doppler mitral flow recordings have partially clinical potentiality in assessing left ventricalar diastolic function in patient with ischmic heart disease.

내산화성 초미립 Fe-Co분말 제조와 자기적 특성에 관한 연구

임재성,강신우,김영삼 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2

Ultra fine Fe-Co particle with oxidation resistance was produced by reducing the silica coated Co-ferrite particle with H_2 at 500℃. When the silica coated Co-ferrite particle was reduced in H_2 at 500℃ for 6 hrs, the silica coated Fe-Co particle(SiO_2/Fe-Co=3.6wt%) showed following properties, e.g, high oxidation resistance below 150℃ , magnetization value of 154.4 emu/g and the size range between 30 and 290Å(mean particle size of 94Å)

특발성 경련질환으로 오인된 원발성 부갑상선기능저하증 1례

신성하,최정영,김준기,고영춘,조상욱,김순호,임중규 全南大醫大 2001 전남의대학술지 Vol.37 No.1

지속가능한 발전을 위한 환경용량평가에 관한 연구

임만택,박영신,이영문 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.2

This study aims to present a framework for environmental management policy that can be used to manage city growth and sustainable development while considering the environmental capacity of the entire region When looking at aspects of the restrictions on development, it is clear that the restrictions on land use for metropolitan development projects are needed based on environmental capacity assessments. The environmental capacity assessment model should include environmental indexes such as water and air quality, waste disposable, and planned green tract development. When looking at the characteristics of environmental indexes phase by' phase, models of various affected zones should be developed, and characteristics of the types of developmental projects, in relation with the capacity of affected zones, should be considered when it is evaluated. By examining the relations above. the environmental capacity assessment of infrastructure should have significant meaning. An environmental management construction system, which should be based on an environmental capacity evaluation, needs to control all development in a given area. It should identify the total amount of development and determine what should be restricted through environmental capacity assessments - particularly the quality of rare environmental features, and the development of those regions with higher need for preservation should be restricted first. Environmentally friendly land use systems, including the use district system, should be conducted through which the specific use plan of the environmental capacity evaluation should be developed. The legal and institutional management relating to limit to exertion of use property right of common people and the plan for the environmental evaluation based on the environmental capacity evaluation should be developed.