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BLN-PZT 9.0/65/35 세라믹을 이용한 광변조기의 스윗칭 및 분광감도 특성
류기원,이영종,박인길,이영희,박창엽 한국전기전자재료학회 1995 電氣電子材料學會誌 Vol.8 No.1
After making the light modulator using the BLN-PZT 9.0/65/35 specimen which has the slim-loop hysteresis characteristics and quadratic electro-optic characteristics, switching and spectral response characteristics were investigated. As the results of switching characteristics of the light modulator, it was found that the transmitted light intensity was modulated by both AC and pulse voltage. From the possibility of the selective transmission of the RGB(Red, Green, Blue) spectrum with electric field, the application for the light modulator, light shutter and color filter was expected.
류기원,정장호,박인길,이영희 한국전기전자재료학회 1993 電氣電子材料學會誌 Vol.6 No.5
본 연구에서는 준강유전 특성을 갖는 xBa(L $a_{1}$2/N $b_{1}$2/) $O_{3}$- (1-x)Pb(Z $r_{y}$ $Ti_{1-y}$) $O_{3}$ (x=8.5, 9.0[mol.%], y=65, 70[mol.%]) 세라믹을 2단 소성법으로 제작한 후, 조성 및 인가전계에 따른 전기광학 특성 및 광변조 특성을 측정하였다. 인가전계가 증가함에 따라 8.5/65/35 시편을 제외한 전조성에서 유효복굴절이 2차 함수적으로 변화하는 2차 전기광학 특성을 나타내었으며 2차 전기광학계수, 반파장전압 및 ON-OFF ratio는 9.0/65/35 시편에서 각각 6.17x$10^{-16}$[ $m^{2}$/ $v^{2}$], 136[V], 252의 가장 우수한 값을 나타내었다. 9.0/70/30, 9.0/65/35 및 8.5/70/30 시편에 대해 광변조 특성을 측정한 결과, 입사광의 세기를 인가전압에 의해 변조시킬 수 있음을 관찰하였다.다.
$Ba(La_{1/2} Nb_{1/2})O_3-Pb(Zr, Ti)O_3$ 세라믹의 상전이 특성에 관한 연구
류기원,배선기,박인길,이영희 한국전기전자재료학회 1995 電氣電子材料學會誌 Vol.8 No.2
Temperature dependences of the dielectric constant K(T), remanent polarization $P_{r}$, (T), effective birefringence overbar .DELTA.n(T), transmitted light intensity and quadratic electro optic coefficient R(T) of the two-stage sintered xBa(L $a_{1}$2/N $b_{1}$2/) $O_{3}$-(1-x)Pb(Z $r_{y}$ $Ti_{1-y}$) $O_{3}$(x=0.085, 0.09, 0.40.leq.y.leq.0.70) ceramics were investigated. Increasing the PbZr $O_{3}$ contents, the crystal structure of a specimen was changed from a tetragonal phase to a rhombohedral and cubic phase, and the phase transition was showed a diffuse phase transition(DPT) characteristics. In the compositions which located on the PE-FE phase boundary, the discrepancy was observed between the Curie temperature and temperature which a microscopic polarization and effective birefringence were disappeared.red.d.
소암거담익기탕(消癌去痰益氣湯)의 cyclophosphamide 부작용 형성 억제효과
류기원,류봉하,윤상협,김진성,홍종희,Ryu, Ki-Won,Ryu, Bong-Ha,Yoon, Sang-Hyub,Kim, Jin-Seong,Hong, Jong-Hee 대한한방내과학회 2002 大韓韓方內科學會誌 Vol.23 No.1
Objective : It is well known that modern chemotherapy against cancer has side effects to a living body, especially hemopoietic and immunologial disfunctions. However, there are no effective ways to reduce them. Recently, traditional Korean herb medicine has been reported to have some biological modifying responses. Therefore, we hypothesized that additional application of herb medicine during chemotherapy is more effective to reduce its side effects. While we were studying the effects, we have observed the inhibitory effect of Soamgudamikgitang on formation of side effects derived from Cyclophosphamide, it has been used in clinical practice at Kyung Hee Medical Center. Methods : We injected 200mg/kg of Cyclophosphamide, one time, to an experimental group, consisting of ten mice. We divided them into eight groups: normal, CPX, SAKT 2mg, SAKT 10mg, SAKT 50mg, SAKT 2mg, CPX, SAKT 10mg+CPX, SAKT 50mg+CPX. We injected Soamgudamikgitang seven days, five days, three days, and one day before we injected CPX. One day, three days, and five days after CPX injection, we injected Soamgudamikgitang again and then killed all the mice. The parameters determined in this experiment were daily body weight liver and spleen weight, RBC, WBC, and platelet for hemopoietic dysfunction and AST, ALT for hepatotoxicity, BUN, creatine for renal toxcity, lymphocyte proliferation activity and lymphocyte subsets for immunological toxcity. Results : We have found that Soamgudamikgitang has inhibitory effects on the formation of Cyclophosphamide's side effects. Significant differences between the group, which contained Cyclophosphamide, and the other group, which contains Cyclophosphamide and 2, 10, 50mg of Soamgudamikgitang respectively were observed. Platelets(2mg of Soamgudamikgitang, p<0.05 ;10mg, p<0.01 ;50mg, p<0.001), liver weight(50mg, p<0.01), spleen weight(10mg, p<0.05), AST(all groups, p<0.01), ALT(2mg, p<0.01 ;10mg, p<0.05 ;50mg, p<0.01), BUN(2mg, p<0.01 ;50mg, p<0.05). Although immunological in both lymphocyte proliferation and its subsets were not observed, which shows that Soamgudamikgitang has a strong effect on T cell activities. Conclusions : From the above results, we can expect that the combined therapy of Soamgudamikgitang and Cyclophosphamide is more effective for treating cancer patients.
투광성 $Ba(La_{1/2}Nb_{1/2})O_3-Pb(Zr_yTi_{1-y})O_3$ 세라믹의 $PbZrO_3$조성에 따른 강유전 특성
류기원,이성갑,배선기,이영희 한국전기전자재료학회 1993 電氣電子材料學會誌 Vol.6 No.3
본 연구에서는 투광성 0.085Ba(L $a_{1}$2/N $b_{1}$2/) $O_{3}$- 0.915Pb(Z $r_{y}$ $Ti_{1-y}$) $O_{3}$(0.45.leq.y.leq.0.70)세라믹을 2단 소성법으로 제작한 후, PbZr $O_{3}$조성 및 온도에 따른 구조적, 강유전적특성을 측정하였다. XRD측정 결과, PbZr $O_{3}$조성이 감소할수록 결자상수 및 단위격자 체적은 감소하였으며 시편의 결정구조는 입방정계에서 능면체정계, 정방정계로 변화되었다. 8.5/60/40시편의 경우 포화분극, 잔류분극 및 항전계가 각각 33.28[.mu.C/$cm^{2}$], 4.15[kV/cm]로 전형적인 메모리 특성을 나타내었으며 PbZr $O_{3}$조성이 증가함에 따라 강유전 이력곡선은 slim loop특성을 나타내었다. 잔류분극은 온도가 증가함에 따라 감소하였으며 특히 PE-FE상경계 부근에 위치한 조성의 경우, 상전이 온도 이하의 온도에서 급격히 감소하는 경향을 나타내었다.다.
허로(虛勞)의 치법(治法) 및 치방(治方)에 관(關)한 문헌적(文獻的) 고찰(考察)
류기원,백태현,Ryu, Gi-Won,Baek, Tae-Hyun 대한한방내과학회 1992 大韓韓方內科學會誌 Vol.13 No.1
This study has been carried out to investigate the treatment and drugs of Hu-Ro(虛勞) by referring to 35 literatures. The results were as follows; 1. The treatment of Hu-Ro(虛勞) is as follows. basic treatment : hujeokboji (虛卽補之) nojaonji sonjaonji (勞者溫之 損者溫之) general treatment : onbo (溫補) - bojungikgiseongyang (補中益氣升陽) chungbo (淸補) - jaeomganghwa (滋陰降火) 2. The drugs of Gi-Su(氣嗽) is as follows. gihu (氣虛) : bojungikgitang (補中益氣湯), sagunjatang (四君子湯) hulhu (血虛) : samultang (四物湯), daebojineum (大補眞飮) yanghu (陽虛) : oogwieum (右歸嗽), jwagihwna (左歸丸) eumhu (陰虛) : yukmihwan (六味丸), jwagihwna (左歸丸) eumyangguhu (陰陽俱虛) : gojineumja (固眞飮子), palmultang (八物湯)