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      • MgO-Al₂O₃-SiO₂계 요업원료(Mullite,Spinel,Cordierite)의 제조 및 소결특성 : Ⅰ. 알콕사이드 졸ㆍ겔법에 의한 물라이트 미분말의 합성 Ⅰ. Preparation of Mullite Fine Powder by an Alkoxide Sol-Gel Process

        이홍림,신승엽,김창은 연세대학교 산업기술연구소 1987 논문집 Vol.19 No.2

        Mullite fine powder was prepared from alkoxides and its powder characterization was examined. The average particle size of mullite powder which was prepared at 1300℃, for 3 h was 0.1-0.2㎛ and the surface area was 11.2㎡/g by BET measurement.

      • 한국판 스미스클라인 비챰의 '삶의 질'척도를 이용한 공황장애 환자의 삶의 질에 관한 연구

        이승호,제영묘,김상엽,이대수,최은영 대한생물치료정신의학회 2000 생물치료정신의학 Vol.6 No.1

        Objectives : In this study, we researched the change of 'quality of life(QOL)' of patient with panic disorder by KvSBQOL and the predictors affecting the change of 'quality of life'. Methods : 30 outpatient with panic disorder were tested by questionnare for panic disorder and KvSBQOL. Frst, they were classified as when healthy before panic episodes(a point of time 1), when first diagnosed as panic disorder in the psychiatry(a point of time 2), and when treated after diagnosis(a point of time 3). Second, the change of QOL scores in five factors at each point was observed, Third, the correlation between the change of QOL scores(point 3 score-point 2 score) and the several predictors(Onset age, Degree of change in panic symtom, Degree of change in anticipatory anxiety, Degree of change in agraphobia, Spended time to diagnose panic disorder, Duration of treatment) were studied. Results : 1) QOL mean scores of a point of time 1,2 and 3 were 166.267±38.24, 94.367±34.00, 161.367±34.37, respectively. 2) The change of QOL scores in all five factors of KvSBQOL(factor1 Competence, factor2 Psychological well-being, factor3 Stability, factor4 Physical well-being, factor5 Activity)at each point was significant(P<.000). 3) The change of QOL mean scores(point 3 score-point 2 score) have significantly negative correlation with the change of score in anticipatory anxiety but not other predictors. Conclusions : Difference in QOL scores between a point of time 1 and 3 is 4.9, indicating that the psychiatric treatment is important in improvement of QOL, the anticipatory anxiety is an important predictor of QOL(P<.001). and it suggested that diminished anticipatory anxiety is very important to maintain of high QOL in patient with panic disorder.

      • KCI등재

        8.3% Carbamide Peroxide 함유 펜 형 자가미백제인 BIancTis Forte의 색조개선 및 안전성에 관한 임상연구

        이진경,민선홍,홍성태,오소람,정신혜,황영혜,유성엽,배광식,백승호,이우철,손원준,금기연 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.2

        This clinical study evaluated the whitening effect and safety of polymer based-pen type BlancTis Forte(NIBEC) containing 8.3% carbamide peroxide. Twenty volunteers used the BlancTis Forte whitening agent for 2 hours twice a day for 4 weeks As a control. Whitening Effect Pen (LG) containing 3% hydrogen peroxide was used by 20 volunteers using the same protocol. The change in shade (ΔE^(*) color difference) was measured using Shadepilot™ (DeguDent) before, during and after bleaching (2 weeks, 4 weeks and postbleaching 4 weeks). A clinical examination for any side effects (tooth hypersensitivity or soft tissue complications) was also performed at each check-up. The following results were obtained. 1 Both the experimental and control groups displayed a noticeable change in shade (ΔE) of over 2 No significant differences were found between the two group (p>0.05) implying that the two agents have a similar whitening effect. 2 The whitening effect was mainly due to changes in a and b values rather than in L value (brightness). The experimental group showed a significantly higher change in b value thus yellow shade than the control(p < 0.05) 3 None of the participants complained of tooth hypersensitivity or soft tissue complications confirming the safety of both whitening agents 8.3%의 carbamide peroxide를 함유한 펜형 코팅용 미백제인 BlancTis Forte (NIBEC, Seosul & JinCheon)를 실험군으로, 3% hydrogen peroxide를 함유한글 Whitening Effect Pen (LG. Seoul) 제재를 대조군으로 각각 피험자 20명에게 2시간씩 1일 2회 제조사의 지시대로 치아표면에 4주간 적용하도록 지시하고 색조개선 효능과 안전성을 평가하였다. 미백 효과는 미백 전 및 미백 2주, 4주 및 미백 종료 4주 후에 Shadopilot™을 이용하여 색 변화를 측정하였고, 매 내원시기마다 모든 환자는 치수생활력 검사와 치주 및 치태 검사를 통해 부작용 여부 (치아과민증 및 구감 내 연조직의 부작용)를 기록한 후 다음과 같은 결과를 얻었다. 1.실험군 및 대조군의 색 변화량 (ΔE)은 2이상으로 인지할 수 있는 색 변화를 보였으며, 두 제품 간에는 통계적으로 유의한 차이를 보이지 않아 (p > 0.05) 유사한 미백효능을 나타냄을 알 수 있었다. 2,미백효과는 명도의 개선보다는 주로 a. b값의 변화에 의한 것으로 특히 실험군에서 b값의 변화, 즉 황색조의 개선효과가 대조군에 비해 유의성 있게 높은 것으로 나타났다 (p <0.05). 3.치아나 치은의 과민증이나 이상증상을 호소하는 피험자는 없어 두 제품 모두 안전성을 확인할 수 있었다.

      • 공초점 표면 증강 라만 분광법을 이용한 금 나노 입자의 시그널 증폭 효과

        최승열,이상엽,주재범 한양대학교 이학기술연구소 2003 이학기술연구지 Vol.6 No.-

        본 연구에서는 고감도 나노-바이오 프로브로 이용하기위한 25-100nm 크기의 다양한 금나노 입자들을 제조하였다. 제작된 금 나노입자의 크기는 특성적인 UV/Vis 흡수 밴드를 이용하여 확인하였으며, 제조된 25-100 nm 직경 크기의 나노 입자에 10^(-8)M의 라만 활성 염료 (crystal violet)을 흡착시켜 서로 다른 크기의 나노 입자에 흡착된 시료의 라만 시그널 증폭효과를 관측하였다. 그 결고,785nm diode laser를 사용하였을 경우 70 nm 크기의 금 나노입자에대하여 가장 크 시그널 증폭효과가 확인되었다. 또한 시료가 흡착된 금 나노입자를 다시 은 나노 입자로 coating하였을 경우 더 큰 시그널 증폭 효과가 관측되었다. Different sizes of gold nano particles in the 25-100 nrn range were prepared by the citrate reduction method. These gold nano particles have a strong potential to be used as highly sensitive nano-bio probes. The particle size was identified using their characteristic UV/Vis absorption bands. In order to find a size-dependent Raman enhancement effect, 10^(-8) M of crystal violet was adsorbed on different sizes of gold nano particles. Confocal Raman microscopy is used to investigate the optical signal enhancement effect. When 785 nm diode laser was used as an excitation source, the 70 nm size of gold shows the best signal enhancement effect. Furthermore, it shows a better signal enhancement effect when the gold nano particles are coated with silver nano particles.

      • 인터넷 기반의 구조물 계측시스템 연구

        김치엽,최만용,권일범,이승석 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1

        Structural health monitoring system should developed to be based on internet and database technology in order to manage efficiently large structures. This system is operated by internet connected with the side of structures. The monitoring system has some functions: self monitoring, self diagnosis, and self control etc. Self monitoring is the function of sensor fault detection. If some sensors are not normally worked, then this system can detect the fault sensors. Also Self diagnosis function repair the abnormal condition of sensors. And self control is the repair function of the monitoring system. Especially, the monitoring system can identify the replacement of sensors. For further study, the real application test will be performed to check some unconvinrences.

      • 감응성막의 전기적 성질을 이용한 유기 가스 반응 특성

        김도균,이준호,유승엽,장정수,권영수 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

        The electrical properties of Maleate copolymer (C_(18)MA-VE_(2)) and Itaconate copolymer (C_(18)ITA-VE_(2)) Langmuir-Blodgett (LB) films for in-plane were investigated to develop the gas sensor. The C_(18)MA-VE_(2) and C_(18)ITA-VE_(2) were used as sensitive materials and deposition on the slide-glass substrate using LB method which could control the thickness in the molecular order (Å). The current-voltage (I-V) characteristics were measured to investigated the response characteristics in chloroform, acetone, ethanol and methanol gases. The conductivity of sensitive films were 10^(-)7[S/cm] for an in-plane. The change of conductivity was occurred by behavior of organic gases, which mean that the behavior of organic gases could be analyzed using conductivity change and application to gas sensor. In the experimental results, the relation between sensitive films and organic gases could be divided by three-type. Thus, we could analyze the modeling of the response characteristics of organic gases using the conductivity change of sensitive films.

      • 複合非破壞試驗法을 利用한 現場콘크리트 强度推定에 關한 硏究

        조철희,김하진,이승엽,김정섭 朝鮮大學校 建設技術硏究所 1999 建設技術硏究 Vol.19 No.1

        This study is to improve the reliability of compressive strength estimation using combined non-destructive testing method in estimating the compressive strength of in-situ concrete after 730 days of age, measures the values of compressive strength and non-destructive test of in-situ concrete with the combined strength of 240kg/㎠, conducts the experiment for estimating the compressive strength, makes the estimation expression of the results through simple and duplicate regressive analysis and then the results of comparing and analyzing to existing expressions to secure the range of application of estimation expression and its reliability are as follows. It is found that the positive curing is very important in the early curing of the strength revelation in long-term age and especially in hydrate and it is considered that the formation and application of estimation expression of comprressive strength according to placement and curing method are needed to enhance the degree of strength estimation of in-situ concrete. After 365 days of age, the compressive strength of concrete tends to be decreased. While the single method has not a great change of non-destructive test value according to the change of concrete strength, the combined method shows a high reliability and then it is appropriate to use it for the exact strength estimation. Existing estimation expression used for estimating the compressive strength indicates a high estimation error in comparison with the expression suggested by this research in the difference of materials used, combined strength of concrete and the difference of placement and curing methods. Accordingly, it will be desirable to use an estimation expression suitable to the in-situ conditions for the exact strength estimation. The estimation expression of compressive strength using combined non-destructive test method of in-situ concrete on 730 days of age (2 years) suggested by this research is as follows. Air Curing fc' = 7.33R+219Vp-846 [R-sq(adj) = 0.839, N=81] Water Curing fc' = 12.6R+176Vp-805 [R-sq(adj) = 0.839, N=81]

      • 다중화된 광섬유 BG 센서에 의한 변형률의 측정

        권일범,김치엽,윤동진,이승석 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1

        FBG(Fiber Bragg grating) sensor, which is one of the fiber optic sensors for the application of smart structures, can not only measure one specific point but also multiple points by multiplexing techniques. We have proposed a novel multiplexing technique of FBG sensor by the intensity modulation of light source. This technique is applicable to WDM(Wavelength Division Multiplexing) technique and number of sensors in this system can be increased by using this technique with WDM technique

      • SCIESCOPUS

        Genomic characterization of extensively drug-resistant <i>Acinetobacter baumannii</i> strain, KAB03 belonging to ST451 from Korea

        Lee, Sang-Yeop,Oh, Man Hwan,Yun, Sung Ho,Choi, Chi-Won,Park, Edmond Changkyun,Song, Hyun Seok,Lee, Hayoung,Yi, Yoon-Sun,Shin, Juhyun,Chung, Chaeuk,Moon, Jae Young,Lee, Je Chul,Kim, Gun-Hwa,Kim, Seung Elsevier 2018 INFECTION GENETICS AND EVOLUTION Vol.65 No.-

        <P><B>Abstract</B></P> <P>Extensively drug-resistant (XDR) <I>Acinetobacter baumannii</I> strains have emerged rapidly worldwide. The antibiotic resistance characteristics of XDR <I>A. baumannii</I> strains show regional differences; therefore, it is necessary to analyze both genomic and proteomic characteristics of emerging XDR <I>A. baumannii</I> clinical strains isolated in Korea to elucidate their multidrug resistance. Here, we isolated new sequence type of XDR <I>A. baumannii</I> clinical strain (KAB03) from Korean hospitals and performed comprehensive genome analyses. The strain belongs to new sequence type, ST451. Single nucleotide polymorphism (SNP) analysis with other types of <I>A. baumannii</I> strains revealed that KAB03 has unique SNP pattern in the regions of <I>gyrB</I> and <I>gpi</I> of MLST profiles. <I>A. baumannii</I> KAB03 harbours three antibiotic resistance islands (AbGRI1, 2, and 3). AbGRI1 harbours two copies of Tn<I>2006</I> containing <I>bla</I> <SUB>OXA-23</SUB>, which play an important role in antibiotic resistance. AbGRI2 possesses aminoglycoside resistant gene <I>aph(3′)-Ic</I> and class A β-lactamase <I>bla</I> <SUB>TEM</SUB>. AbGIR3 has macrolide resistant genes and aminoglycoside resistant gene <I>armA</I>. <I>A. baumannii</I> KAB03 harbours mutations in <I>pmrB</I> and <I>pmrC</I>, which are believed to confer colistin resistance. In addition, proteomic and transcriptional analysis of KAB03 confirmed that β-lactamases (ADC-73 and OXA-23), Ade efflux pumps (AdeIJK), outer membrane proteins (OmpA and OmpW), and colistin resistance genes (PmrCAB) were major proteins responsible for antibiotic resistance. Our proteogenomic results provide valuable information for multi-drug resistance in emerging XDR <I>A. baumannii</I> strains belonging to ST451.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Whole genome of an XDR <I>A. baumannii</I> KAB03 belonging to ST451, isolated in South Korea, was analyzed </LI> <LI> <I>A.s baumannii</I> strains belonging to ST451 have unique SNP pattern in the regions of <I>gyrB</I> and <I>gpi</I> of MLST profiles </LI> <LI> Antibiotic resistance proteins of <I>A. baumannii</I> KAB03 were suggested by proteomic and transcriptomic analysis </LI> </UL> </P>

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