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        • 수험생활 중 경주 및 포항 지진 경험

          김선주,김유영,김은주,박솔민,배지윤,이민영,이유진,정재원,Li Keying,Wuyingjinzhu,신수진,도지영 이화여자대학교 간호과학대학 2019 이화간호학회지 Vol.- No.53

          Purpose: The purpose of this study was to understand the experiences of Gyeongju and Pohang earthquakes during the examinees’ life. Methods: This study applied Colaizzis’s Phenomenological method. The Data was collected through in-depth interviews with a total 8 students of university in Seoul. Results: On the analysis of the interviews, their experience can be expressed as ‘Feeling embarrassed and frightened by earthquakes’, ‘Reduced susceptibility to earthquake hazards due to heavy exam pressure’, ‘Increased exam stress due to earthquake’, ‘Feeling the inadequacy of examinees' earthquake related safety measures in retrospect’. Conclusion: This study was meaningful in deeply understanding of their experiences and revealing that the examinees were more focused on studying rather than actively coping with the disaster. Furthermore, it reconsider the social climate surrounding college admission exams. This study meaningfully discovered that examinees could not stably prepare for both the exam and the earthquake evacuation procedures due to the timing of the earthquake in relation to their upcoming college admission test. Therefore, this study highlighted the examinees’ difficulties due to the earthquakes and increased the necessity of acute phase nursing intervention in relation to the seismic safety education system.

        • KCI등재

          증강화학 발광 면역법을 이용한 잡상선 홀몬 측정평가

          김순기 ( S K Kim ),김용남 ( Y N Kim ),허순자 ( S Z Her ) 대한임상검사과학회 1991 대한임상검사과학회지(KJCLS) Vol.23 No.1

          Whereas radioimmunoassay technique which is very sensitive as well as accurate has been widely used for the assay of most endocrinological hormones, numbers of related problems launched the search for many lab. techniques that can replace the use of radioisotopes. Authors employed "Enhanced Luminescence Immunoassay" (ELlA) technique as the one to assay and evaluate thyroid hormone(T3, T 4) and thyroid stimulating hormone( TSH). The results are as follows : 1. Precision rate was calculated by assaying T 3, T 4. TSH and 25 times repetitively at 3 diffeerent concentration for each-low, medium, high -. and so was judged excellent as the coefficient of variation(CV) was 5.6% 1.6% 3% (Low), 3.2%, 2 .1%, 1.5% (medium). 5 .0%, 3%. 1.5% (High). 2. Control serum sample with known assay value labelled as Low, Medium, High was tested for 20 times for each and the results are 0. 45ng/ml (0.36-0.5), 1.37ng/ml(l.07-2.34), 3.3ng/ml (2.34-3.5) for T 4 : 3.0,ug/dl(2.3-4.1), 9.2,ug/ dl(8.0-0.18), 15Jlg/dl(12.0-18.2) for T4: and 0 .16JLIU/ml (0 .8-0 .18), 5. 65JLIU/ml (4. 6--6. 8), 29.4JLIU/ml(20.06-3l.O)for TSH. They are all in permissable range shown in the parenthesis and close the mean value, and so was judged relatively accurate. 3. Comparison with other techniques. 1) For 27 samples of T 3, 31 T4 samples, 27 TSH samples which show different values from the assay values by radioimmunoassay technique, the slope was Y=0.99x+0.06, Y=0.98x+0.27, Y = x + 0. 04 (Y =ELlA, x =RIA) and the correlation coefficient was 0. 986, 0. 958, 0. 99 in good correlation, and so did not show any statistically appreciable difference (p < 0. 01, p < 0. 05) . 2) For comparison with IMx which is also a enzyme immunoassay technique, 25 samples of T3, 36 T4 samples, 33 TSH samples were tested. The resultant slope was Y = 0. 83x + 0 .17, Y = 0. 77 x + 1.82, Y = 0. 75x+0.10(Y =ELlA, x = IMx) and the correlation coefficient was 0. 938, 0. 869, 0. 896 in good correlation for each. Accroding to the above results Amerlite, a "Enhanced Luminescence Immunoassay" technique, may be regarded as a substitute for RIA technique and the E. 0. S method (Economy of Standard) was not only economic but also able to manipulate a large quantity speedily.

        • KCI등재

          R&D Status of High-current Accelerators at IFP

          J. J. Deng,J. S. Shi,W. P. Xie,L. W. Zhang,K. Z. Zhang,S. P. Feng,J. Li,M. Wang,Y. He,L. S. Xia,Z. Y. Dai,H. T. Li,L. Wen,S. F. Chen,X. Li,Q. G. Lai,M. H. Xia,Y. C. Guan,S. Y. Song,L. Chen 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61

          High-current accelerators have many important applications in Z-pinches, high-power microwaves, and free electron lasers, imploding liners and radiography and so on. Research activities on Zpinches, imploding liners, radiography at the Institute of Fluid Physics (IFP) are introduced. Several main high-current accelerators developed and being developed at IFP are described, such as the Linear Induction Accelerator X-Ray Facility Upgrade (LIAXFU, 12 MeV, 2.5 kA, 90 ns), the Dragon-I linear induction accelerator (20 MeV, 2.5 kA, 60 ns), and the Primary Test Stand for Z-pinch (PTS, 10 MA, 120 ns). The design of Dragon-II linear induction accelerator (20 MeV, 2.5 kA, 3 × 60 ns) to be built will be presented briefly.

        • KCI등재후보

          Hygrothermal stress analysis of laminated composite porous plates

          Y.Z. Yüksel,Ş.D. Akbaş 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.1

          This paper presents the stress analysis of a composite laminated simply supported plate with porosity under hygrothermal rising. In the displacement-strain relation of the plate structure, the first shear plate deformation theory is used. Material properties of laminas are considered as orthotropic. Three different porosity distributions are used. In the solution process, the Navier method is implemented for simply supported laminated composite plate. Non-uniform temperature and moisture rising are considered for laminated plate with three laminas. In the numerical results, the stress distributions of the laminated plate are presented and discussed for different values of moisture, temperature, stacking sequence of laminas and orientation angle of layers. The numerical results show that the hygrothermal condition is very effective in the stress behavior of laminated plates.

        • KCI등재

          Numerical solution for multiple confocal elliptic dissimilar cylinders

          Y. Z. Chen 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.2

          This paper provides a numerical solution for multiple confocal elliptic dissimilar cylinders. In the problem, the inner elliptic notch is under the traction free condition. The medium is composed of many confocal elliptic dissimilar cylinders. The transfer matrix method is used to study the continuity condition for the stress and displacement along the interfaces. Two cases, or the infinite matrix case and the finite matrix case, are studied in this paper. In the former case, the remote tension is applied in y- direction. In the latter case, the normal loading is applied along the exterior elliptic contour. For two cases, several numerical results are provided.

        • Size-resolved cloud condensation nuclei concentration measurements in the Arctic: two case studies from the summer of 2008

          Zá,bori, J.,Rastak, N.,Yoon, Y. J.,Riipinen, I.,Strö,m, J. Copernicus GmbH 2015 Atmospheric Chemistry and Physics Vol.15 No.23

          <P>Abstract. The Arctic is one of the most vulnerable regions affected by climate change. Extensive measurement data are needed to understand the atmospheric processes governing this vulnerability. Among these, data describing cloud formation potential are of particular interest, since the indirect effect of aerosols on the climate system is still poorly understood. In this paper we present, for the first time, size-resolved cloud condensation nuclei (CCN) data obtained in the Arctic. The measurements were conducted during two periods in the summer of 2008: one in June and one in August, at the Zeppelin research station (78°54´ N, 11°53´ E) in Svalbard. Trajectory analysis indicates that during the measurement period in June 2008, air masses predominantly originated from the Arctic, whereas the measurements from August 2008 were influenced by mid-latitude air masses. CCN supersaturation (SS) spectra obtained on the 27 June, before size-resolved measurements were begun, and spectra from the 21 and 24 August, conducted before and after the measurement period, revealed similarities between the 2 months. From the ratio between CCN concentration and the total particle number concentration (CN) as a function of dry particle diameter (Dp) at a SS of 0.4 %, the activation diameter (D50), corresponding to CCN / CN = 0.50, was estimated. D50 was found to be 60 and 67 nm for the examined periods in June and August 2008, respectively. Corresponding D50 hygroscopicity parameter (κ) values were estimated to be 0.4 and 0.3 for June and August 2008, respectively. These values can be compared to hygroscopicity values estimated from bulk chemical composition, where κ was calculated to be 0.5 for both June and August 2008. While the agreement between the 2 months is reasonable, the difference in κ between the different methods indicates a size dependence in the particle composition, which is likely explained by a higher fraction of inorganics in the bulk aerosol samples. </P>

        • KCI등재

          Thickness induced magnetic anisotropic properties of Tb-Fe-Co thin films

          Yüzüak G. Durak,Yüzüak E.,Ennen I.,Hütten A. 한국물리학회 2021 Current Applied Physics Vol.29 No.-

          The influence of Tb25Fe61Co14 thin film thicknesses varying from 2 to 300 nm on the structural and magnetic properties has been systematically investigated by using of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, magnetization, and magneto-optic Kerr effect microscopy measurements. Thin film growth mechanism is pursued and controlled by ex-situ X-ray refractometry measurements. X-ray diffraction studies reveal that the Tb25Fe61Co14 films are amorphous regardless of thin films thicknesses. The magnetic properties are found to be strongly related to thickness and preferred orientation. With an increase in film thickness, the easy axis of magnetization is reversed from in-plane to out-of-plane direction. The change in the easy axes direction also affects the remanence, coercivity and magnetic anisotropy values. The cause for the magnetic anisotropy direction change from in-plane to out-of-plane can be related to the preferred orientation of the thin film which depends on the large out-of-plane coercivity and plays an important role in deciding the easy axes direction of the films. According to our results, up to the 100 nm in-plane direction is dominated over the whole system under major Fe-Fe interaction region, after that point, the magnetic anisotropy direction change to the out-of-plane under major Tb-Fe/Tb-Co interaction region and preferred orientation dependent perpendicular magnetic anisotropic properties become more dominated with 2.7 kOe high coercive field values.

        • 저급휘발성지방산(VFA) 의 첨가가 곰팡이의 성장 및 섬유소 분해율에 미치는 영향

          노영애,하종규,황일환,김완영,강민원,고종렬,고주 한국영양사료학회 1999 韓國營養飼料學會誌 Vol.23 No.2

          본 실험에서는 반추위내에 존재하는 acetic acid, propionic acid, butyric acid, valeric acid 등의 straight chain fatty acid와 isobutyric acid, isovaleric acid, 2-methylbutyric acid 등의 branched chain fatty acid를 곰팡이의 배지에 0.01% 첨가하여 곰팡이의 성장 및 섬유소 분해효소의 활력과 섬유소 분해율에 미치는 영향을 측정하였는데 실험 결과는 다음과 같다. 1. 모든 휘발성 지방산의 첨가는 Neocallimastix frontalis C5-1 곰팡이의 성장 및 섬유소 분해력을 떨어뜨렸다. 2. VFA 종류별로 보면 straight chain fatty acid가 blanched chain fatty acid 보다 더 큰 억제인자로 작용하였다. 3. Branched chain fatty acids 중에서 isovaleric acid와 2-methelbutyric acid의 첨가는 곰팡이의 균체단백질 함량을 증가시켰다. 4. Straight chain fatty acids의 효과를 서로 비교하면 탄소수가 증가될수록 곰팡이에 대한 억제작용이 더 크게 나타났다. This study was performed to elucidate the effects of short chain fatty acids (acetic acid, propionic acid, butyric acid, valeric acid, iso-butyric acid, iso-valeric acid, 2-methyl-n-butyric acid) supply on fungal growth, cellulolytic enzyme activity and cellulose degradability. Neocallimastix. frontalis C5-1 was inoculated into Lowe's medium, containing 0.01% each fatty acid. Incubation times were 1, 3, 5 and 7 days, and fungal growth, cellulolytic enzyme activity and cellulose degradability were measured after incubation. Short chain fatty acid supplementation depressed growth and cellulose degadability of N. frontalis, regardless of the kind of fatty acid. Straight chain fatty acids were more detrimental effects on fungal growth than branched chain fatty acids. Straight chain fatty acids with more carbon numbers tended to decrease fungal growth to a greater extent Among the branched chain fatty acids, the contents of fungal protein were increased by treatment of isovaleric acid and 2-methylbutyric acid.

        • SCIESCOPUSKCI등재

          LINEAR OPERATORS THAT STRONGLY PRESERVES THE SIGN-CENTRAL MATRICES

          Lee, G._Y,Lee, S._G.,Song, S._Z 대한수학회 1997 대한수학회보 Vol.34 No.1

          Let M_m,n be the set of all m × n real matrices. For a matrix A=[α_ij]∈ M_m,n, the sign of αij is defined by sgn αij= 0 if αij=0, +1 if αij>0, -1 if αij<0. The sign pattern of A, A is the m × n {0,1,-1}-matrix A= [sgn αij] = sgn A obtained from A by replacing each entry with its sign. If A and B are sign pattern matrices with same size, then A + B is qualitatively defined if αijbij ≠ -1 for all i and j, 1 ≤ i ≤ m, 1 ≤ j ≤ n. If αijbij = -1, then αij + bij is 0, -1 or +1. So, we cannot dctcrminc the sign of the entry αij + bij. That is, A + B is undefined. Let Q(B) be the qualitative class of B such that the sign pattern of any matrix in Q(B) equals to the sign pattern of B = [bij],i.e.,

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