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CoxFe_(1-x) Cr_2S_4 (0?X?1)시료를 진공중에 직접 합성법으로 제조하여 X선 회절법 Mossbauer 분광법, 자화율 측정법과 전기 전도도 측정법을 사용하여 연구하였다. 결정구조는 입방 spinel 구조이고 격자상수 a_0는 9.985Å∼9.927Å의 값을 갖고 있다. Mo ssbauer spectra와 자기 모우먼트 값을 액체 질소 온도에서부터 고온까지 여러온도에서 측정한 결과, 철 이온은 +2가 로서 사면체 자리에만 들어가고 초미세 자기장과 자기 모우먼트 값이 온도 상승과 더불어 같은 비율로 감소하는 사실을 발견 했으며, 자기적 정렬의 본질은 준 강자성체 임을 알았다. 온도에 따른 비 저항의 변화를 측정하여 반도체임을 확인하고 활성화 에너지는 큐리온도 이상과 이하에서 각각 0.039 eV ∼ 0.079eV, 0.014eV ∼ 0.052eV로 측정되었다. The mixed spinel system Cox Fe_(1-x) Cr_2S_4 (0〈 X〈 1) has been studied using X_rays, Mssbauer, magnetic and resistivity measurements. The crystal structure is cubic spinel and the lattice constant a_0 is found to be 9.985Å∼ 9.927Å. Mossbauer spectra, magnetic moments and resistivities have been collected from 82 K to high temperature. Fe ions are ferrous in character and occupy only tetrahedral sites. The magnetic hyperfine fields and magnetic moments decreasing with increasing temperature and it is found that the magnetic-ordering is characteristic of ferrimagnetic material. Temperature dependence of the resistivity indicates that the sampls are semiconductors and activation energies are determined to be 0.039 eV∼0.079 eV, 0.014 eV∼0.052 eV, respectively, in the higher-and lower-than-magne-tic-ordering-temperature regions.
Objective : Akebia species and Aristolochia species are some of the most medicinally important genera in the Oriental medicine. This study was performed to determine if Akebia species and Aristolochia species could be identified by genetic analysis and to verify Pyrosequencing analyses, which was used to assess genetic variation. Method : The DNAs of Akebia quinata Decaisne and Aristolochia manshuriensis Kom. were extracted, and we have investigated the typing of single-base variations of Akebia species and Aristolochia species in DNA by using Pyrosequencing. Result : Akebia quinata Decaisne showed different pattern compared with Aristolochia manshuriensis Kom.. The peak of Akebia quinata Decaisne was very week in the second A nucleotide base but The peak of Aristolochia manshuriensis Kom. was very high. From these results we verified that our Akebia species and Aristolochia species-specific sequencing primers were well designed. Conclusion : Pyrosequencing analysis might be able to provide the identification of the Akebia species and Aristolochia species.
Idiopathic thrombocytopenic purpura(ITP) is an autoimmune bleeding disorder characterized by the development of antibodies to one's own platelets, which are then destroyed by phagocytosis in the spleen and liver. Its clinical manifestations are characterized by bleeding and the most serious complication is hemorrhage into the central nervous system, but which is rarely seen below 1%. In treating IPT, the therapy of first chice is administration of adrenocorticosteroid and r-globuline. If satisfactory results are not obtained, then splenectomy is recommended. If this also proves inadequate, then administration of immunosuppressants is carried out. 16-year-old male was admitted with complaints of left hemiplegia and nasal bleeding. This case may be developed spontaneous intracerebral hemorrhage causing thrombocytopenia and was treated by steroid, r-globuline and splenectomy, but satisfactory results are not obtained. After all, the paient was successfully treated with cyclophosphamide.
지금까지의 일반적인 시료 제작 방법과는 다르게 화학적인 방법을 사용하여 미세 입자 상태 에서 시료를 제조한 후, 고온에서 열처리한 다음 여러 온도로부터 급랭시킨 CuFe_2O_4 시료에 대한 결정학적 및 자기적 성질을 X선 회절기와 M¨ossbauer 분광기를 이용하여 결정 상태의 변화에 대하여 미시적으로 연구하였다. 그 결과 600℃로부터 급냉시킨 시료의 경우는 tetragonal phase spinel 구조로서 격자 상수는 a = 8.26±0.05 Å, c = 8.70±0.05 Å임을 확인하였다. 한편, 1000℃에서 급랭시킨 시료 는 격자 상수 a = 8.37±0.05 Å를 갖는 cubic spinel 구조임을 밝혀졌다. 액체 질소 온도로부터 Curie 온도 이상까지 여러 온도 범위에서 M¨ossbauer spectrum을 분석한 결과 Cu^(2+)이온이 저온에서는 spinel 구조의 팔면체 자리에 위치하여 Jahn―Teller 효과를 나타내고 이에 따라 600℃로 부터 급랭시킨 시료의 경우 500 K 근방에서 결정 구조의 변화가 일어나고 있음을 알았다. 그리고 이러한 결정학적 상전이 온도는 급랭 온도가 높아짐에 따라 낮게 나타났다. 결정 변화의 주 요인이 되는 Debye 온도는 저온에서 급랭한 시료에서 작아지고 급랭 온도가 높을수록 증가함을 알았고 cubic 구조가 tetragonal 구조에 비하여 더 작은 Debye 온도를 나타내고 있다. CuFe_2O_4 prepared by chemical method were quenched from various temperatures and the crystallographic and magnetic properties have been studied by diffraction and M¨ossbauer spectroscopy. The sample quenched from 600℃ is found to have a tetragonal spinel with lattice constant a = 8.26±0.05 Å, c = 8.70±0.05 Å. On the other hand, the sample quenched from 1000, a cubic spinel structure with lattice constant a = 8.37±0.05 Å. As the result of the measurements, the M¨ossbauer spectra between the temperature of liquid nitrogen to the Curie temperature show that the Cu^(2+)ions at octahedral site have the Jahn―Teller effect and the sample quenched from 600 exhibits a structural phase transition near 500 due to the Jahn―Teller effect. The temperature of the structural phase transition if lower as increasing the quenching temperature. Debye temperature are the maun factor of phase transition and increasing as the quenching temperature and the Debye temperature of the cubicstructure is lower then that of the tetragonal structure.
서정철,서보명,김성웅,이경민,윤종석,이세연,김경운,이윤경,임성철,정태영,황재옥,한상원,Seo, Jung-Chul,Seo, Bo-Myung,Kim, Sung-Woong,Lee, Kyung-Min,Yun, Jong-Seok,Lee, Sea-Youn,Kim, Kyung-Woon,Lee, Yoon-Kyung,Lim, Seong-Chul,Jung, Tae-Young 경락경혈학회 2004 대한침구의학회지 Vol.21 No.2
Objective : This study was designed to estimate the effects of Rainbow Power therapy on neck pain patients by using Visual Analogue Scale(VAS) and pressure algometer. Methods : Rainbow Power therapy group consisted of 18 patients and acupuncture therapy group consisted of 7 patients. The degree of improvement of neck pain was evaluated by VAS and pain pressure threshold(at the points of Jianjing GB21 and Jianwaishu SI14) before treatment, before 3rd treatment and before 5th treatment. Rainbow Power therapy was performed at the points of Jianjing GB21, Zhongfu LU1, Yangxi LI5, Ganshu BL18, Weishu BL21 and Shenshu, BL23. Each points were stimulated with RP-UM103(Rainbow Power therapy instrument) for 20 seconds. The points of acupuncture therapy were Jeonggeun, Jeongjong, Sangbaekn and Hegu LI4 and acupuncture was maintained for 15 minutes. After above therapy dry cupping was performed at the points of Jianjing GB21, Jianwaishu SI14, Gaohuang BL43, Tianzong, SI11 and Bingfeng SI12 for 5 minutes. Results : There was no significant difference between the two groups in VAS, pain threshold of Jianjing GB21 and Jianwaishu SI14 following treatment. In the two groups VAS was significantly decreased. In Rainbow Power therapy group the pain threshold of the two points was significantly increased. But there was no significant increase in acupuncture therapy groups about the pain threshold of Jianwaishu SI14. Conclusions : The effectiveness of Rainbow Power therapy on neck pain was shown through VAS and pressure algometer. These imply that Rainbow Power therapy may be useful for neck pain. Further study is needed about Rainbow Power therapy.
In East-South Asia it has been widely known that Korean ginseng(Panax ginseng) increases body temperature, whereas American ginseng(Panax quinquefolius) decreases it. This study was designed to find out if Korean ginseng could increase body temperature comparing with American ginseng. Double-blind randomized controlled trials on body temperature of Korean ginseng and American ginseng in Koreans and Chineses was performed by using electronic thermometer at the ear. There was no significant difference between Korean ginseng and American ginseng in Koreans as well as Chineses by repeated-measures ANOVA. It was revealed that Korean ginseng does not increase body temperature. Maybe the concept that Korean ginseng increase body temperature is concerned with commercial interests dealing with American Ginseng.