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김재식,최의선,이문기,배선기,이영희,Kim, Jae-Sik,Choi, Eui-Sun,Lee, Moon-Kee,Bae, Sun-Gi,Lee, Young-Hie 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.1
The microwave dielectric properties of 0.6TiTe$_3$O$_{8}$-0.4MgTiO$_3$ ceramics with H$_3$BO$_3$-SnO were investigated to improve the sintering condition for the LTCC. According to the X-ray diffraction patterns, 0.6TiTe$_3$O$_{8}$-0.4MgTiO$_3$ ceramics with H$_3$BO$_3$-SnO had the columbite structure of TiTe$_3$O$_{8}$ phase and the ilmenite structure of MgTiO$_3$ phase and there were no second phase. Increasing the addition of H$_3$BO$_3$-SnO, the density and dielectric constant of the 0.6TiTe$_3$O$_{8}$-0.4MgTiO$_3$ ceramics were increased but the quality factor was decreased. The temperature coefficient of resonant frequency was shifted to the negative(-) direction with addition of H$_3$BO$_3$-SnO.EX>-SnO.
(1-x)Mg4Ta2O9-x(TiO2, CaTiO3, SrTiO3) 세라믹스의마이크로파 유전 특성
김재식,최의선,배선기,이영희 대한전기학회 2006 전기학회논문지C Vol.55 No.7(C)
- The effect of x on microwave dielectric properties of the (1-x)Mg4Ta2O9-x(TiO2,CaTiO3,SrTiO3) ceramics for microwave components were investigated. All spcecimens prepared by the conventional mixed oxied method and sintered at 1450℃. Microwave dielectric properties of the (1-x)Mg4Ta2O9-xTiO2 ceramics were influenced by MgTi2O5 phase. Also the microwave dielectric properties of the (1-x)Mg4Ta2O9-x(CaTiO3, SrTiO3) ceramics were dominated with an addition of CaTiO3 and SrTiO3. The dielectric constant (εr), quality factor (Q×fr) and temperature coefficient of the resonant frequency (TCRF, τf) of the (1-x)Mg4Ta2O9-x(TiO2, CaTiO3, SrTiO3) ceramics were 12.96~70.98, 5,132~186,410 GHz and -35.82~+75.96 ppm/℃, respectively, and depend on x and addition materials.
배선용,박철기,김태민,박성혜,김일한,최승홍 대한자기공명의과학회 2015 Investigative Magnetic Resonance Imaging Vol.19 No.4
Purpose: To investigate whether volumetric analysis based on T2WI and contrastenhanced(CE) T1WI can distinguish between isocitrate dehydrogenase-1 mutationpositive(IDH1P) and -negative (IDH1N) glioblastomas (GBMs). Materials and Methods: We retrospectively enrolled 109 patients with histopathologicallyproven GBMs after surgery or stereotactic biopsy and preoperative MR imaging. We measured the whole-tumor volume in each patient using a semiautomaticsegmentation method based on both T2WI and CE T1WI. We compared the tumorvolumes between IDH1P (n = 12) and IDH1N (n = 97) GBMs using an unpaired t-test. In addition, we performed receiver operating characteristic (ROC) analysis for thedifferentiation of IDH1P and IDH1N GBMs using the tumor volumes based on T2WIand CE T1WI. Results: The mean tumor volume based on T2WI was larger for IDH1P GBMs thanIDH1N GBMs (108.8 ± 68.1 and 59.3 ± 37.3 mm3, respectively, P = 0.0002). Inaddition, IDH1P GBMs had a larger tumor volume on CE T1WI than did IDH1N tumors(49.00 ± 40.14 and 22.53 ± 17.51 mm3, respectively, P < 0.0001). ROC analysisrevealed that the tumor volume based on T2WI could distinguish IDH1P from IDH1Nwith a cutoff value of 90.25 (P < 0.05): 7 of 12 IDH1P (58.3%) and 79 of 97 IDH1N(81.4%). Conclusion: Volumetric analysis of T2WI and CE T1WI could enable IDH1P GBMs tobe distinguished from IDH1N GBMs. We assumed that secondary GBMs with IDH1Punderwent stepwise progression and were more infiltrative than those with IDH1N,which might have resulted in the differences in tumor volume.
$Pb(Mb_{1/3}Nb_{2/3})O_3$-$BaTiO<_3$-$CaZrO<_3$세라믹의 유전특성에 관한 연구
김수하,배선기 한국전기전자재료학회 1997 電氣電子材料學會誌 Vol.10 No.10
In this paper the dielectric properties of (0.8-x)Pb(Mb$_{1}$3//Nb/2/3)O$_3$/BaTiO$_3$-CaZrO$_3$(x=0.1, 0.15, 0.2, 0.25) ceramics were investigated. Specimens were prepared by the conventional mixed oxide method and sintering temperature and time were 1000~115$0^{\circ}C$ 2hr, respectively. The structural and dielectric properties with variation of sintering temperature and composition were investigated. All the specimens sintered at 115$0^{\circ}C$ for 2hr showed the highest value of 1043. With increasing the contents of CZ and frequency dielectric constant was decreased and which was decreased with increasing temperature from 3$0^{\circ}C$ to 15$0^{\circ}C$.
김재식(Jae-Sik Kim),김상우(Sang-Woo Kim),류기원(Ki-Won Ryu),배선기(Seon-Gi Bae),이영희(Young-Hie Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
The sintering behavior and high frequency properties of Ba-hexagonal ferrite were investigated. All samples of the Ba-hexagonal ferrite were prepared by the conventional mixed oxide method and sintered at 1150℃~1400℃. From the X-ray diffraction patterns of sintered Ba-hexagonal ferrite, the Ba₃Co₂Fe₂₄O₄₁ phase was represented as main phase in the almost sintering conditions. The bulk densities with sintering temperature and decreased at 1400℃. The bulk density of Ba₃Co₂Fe₂₄O₄₁ ceramics sintered at 1300℃ was 4.79 g/㎤. The permittivity (ε') of Ba₃Co₂Fe₂₄O₄₁ ceramics was increased and the permeability was decreased with sintering temperature, respectively. The permittivity and permeability of Ba₃Co₂Fe₂₄O₄₁ ceramics sintered at 1300℃ were 19.896 and 14.218 at 210 ㎒, respectively.