http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Co<sub>3</sub>O<sub>4</sub> 첨가량 변화에 따른 ZnO Varistor의 전기적 특성
조현무,이성갑,Cho, Hyun-Moo,Lee, Sung-Gap 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.11
ZnO varistor ceramics which were fabricated with variation of added of 0.5~1.0 mol% Co$_3$O$_4$, were sintered at 1150 $^{\circ}C$. In the specimen added 0.7 mol% Co$_3$O$_4$, sintered density was 6.03 g/㎤ and electrical properties were superior to any other compositions. The nonlinear coefficient a and clamping voltage ratio were 83 and 1.35, respectively. But, endurance surge current in the specimen added 0.5 mol% Co$_3$O$_4$ was 7000 A/$\textrm{cm}^2$, and deviation of varistor voltage was Δ-3.23 %. As P.C.T and T.C.T environmental test were succeed in all specimens, and deviation of varistor voltage in the specimen added 0.6 mol% Co$_3$O$_4$ was Δ-0.81 %. All specimens showed good leakage current property on the High Temperature Continuous Load Test(HTCLT) for 1000 hr at 85 $^{\circ}C$ and variation rate of the varistor voltage below Δ-2.0 %.
Glass 첨가량에 따른 ZnO 바리스터의 전기적 특성
조현무,이종덕,박상만,이성갑,Cho, Hyun-Moo,Lee, Jong-Deok,Park, Sang-Man,Lee, Sung-Gap 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.9
ZnO varistor ceramics were fabricated with variation of addition of glass-frit amount and the sintering temperature was $1100^{\circ}C$. The average grain sizes were showed increased from $8.6{\mu}m\;to\;10{\mu}m$, and varistor voltages were decreased from 506V to 460V by added amount of glass-frit. Nonlinear coefficient $\alpha$, of all were with increasing the amount of glass-frit more than 70, in case of added on $0.03wt\%$ glass-frit was 83. And leakage current were less than $1{\mu}A$ with applied at $82\%$ of varistor voltage. The clamping voltage ratio of the specimens added $0.03wt\%$ glass-frit was 1.41 at applied 25A $[8/20\;{\mu}s]$. In the specimen added $0.03wt\%$ glass-frit, endurance of surge current and deviation of varistor voltage were $6200A/cm^2,\;\Delta-1.67\%$, respectively and clamping voltage ratio was 2.33. In the Specimen added $0.03wt\%$ glass-frit were superior to any other compositions on High Temperature Load Test(HTLT) for 1000 hr at $85^{\circ}C$, and deviation of the varistor voltage were $\Delta-1.29\%$.
랫드에서 계피유래활성물질(CB-PH)의 경구투여에 의한 4주간 반복투여독성 시험
조현무(Hyun-Mu Jo),성낙원(Nak-Won Seong),제정환(Jung Hwan Che),박기대(Ki Dae Park),남기택(Ki Taek Nam),조완섭(Wan-Seob Cho),한범석(Beom Seok Han),양기화(Ki Hwa Yang),김방현(Bang Hyun Kim),이국경(Kook Kyung Lee),김형진(Hyoung-Chin Kim 한국독성학회 2003 Toxicological Research Vol.19 No.4
Although 'Cinnamon' has been widely used for the food and biophamacy in the world, it's toxicity was not screened completely. Major component of 'cinnamon' is CB-OH and CB-PH. CBPH has been reported to have antimutagenic effect. To investigate the toxicity of 2- o-Benzoylcinnamaldehyde (CB-PH), repeated dose (4 weeks) oral toxicity test performed in SD rats. Results of repeated dose oral toxicity tests for 4 weeks (CB-PH; 500, 1000, 2000 mg/kg/day) suggested that the CB-PH treated group showed no significant toxicological findings with body weights, organ weights, hematological and histopathological findings. Therefore, these data indicated that the maximum tolerated dose of CB-PH was 2000 mg above/kg/day in the rats.
개정된 소 도체 등급판정 세부기준에서 도체성적과 도축월령이 등급판정에 미치는 영향력 평가
조현진,정연복,김병도,정사무엘,서성원 경상대학교 농업생명과학연구원 2020 농업생명과학연구 Vol.54 No.2
본 연구는 개정된 소 도체 등급판정 세부기준이 개정 목표에 부합되는지를 평가하기 위해 실시되었다. 본 연구에서는 기초 데이터를 바탕으로 데이터의 분포를 도출하고, 도출된 분포를 바탕으로 미래 데이터를 추출하여 이를 분석하는 몬테카를로(Monte Carlo) 방법론을 활용하였다. 축산물품 질평가원의 2019년 1월 2일부터 2019년 5월 31일까지 등급판정을 받은 한우 거세 비육우의 도체정보(n=187,279)를 이용하여 각 도체성적의 분포와 상관관계를 도출하였다. @risk 소프트웨어를 이용하여 10만 개의 가상 도체 데이터를 Latin hypercube 방법으로 추출하여 몬테카를로 시뮬레이션을 실시하고, 각 변수들이 육량지수, 육량등급, 육질등급에 미치는 영향력을 평가하였다. 시뮬레이션 결과, 육량지수는 현행 등급판정 기준과 개정된 기준에서 모두 도체중량이 증가함에 따라 감소하는 것으로 나타났으며 각 변수들에 대한 민감도는 두 기준이 유사하였다. 개정된 기준에서는 도축월령이 증가함에 따라 그 정도는 미미하지만 육량지수 및 육량등급이 저하되는 것으로 나타났다(P < 0.001). 현행 등급판정 기준에서는 그 밖의 도체성적이 동일할 때, 육질등급은 배최장근단면적과 도축월령이 증가할수록 개선되고(P < 0.01), 등지방두께와 도체중량은 육질등급에 유의적인 영향을 미치지 않는 것으로 나타났다. 그러나 개정된 등급판정 기준에서는 육질등급이 모든 도체성적 및 도축월령과 유의적인 관계를 갖는데(P < 0.01), 그 밖의 도체성적이 동일하다면, 도체중량이 클수록, 등지방두께가 얇을수록, 배최장근단면적이 적을수록, 도축월령이 적을수록 육질등급이 개선되는 것으로 나타났다. 결론적으로 새로운 ‘소 도체 등급판정 세부기준’은 도체중량의 증가에 따라 육량등급을 증가시키는 것은 아니나, 현행 기준에 비해 한우의 사육기간을 단축시키는 효과는 클 것으로 기대된다. This study was conducted to assess whether the revised beef carcass grading system is appropriate for accomplishing the objective of the revision. We used Monte Carlo methodology to simulate the yield and quality grades of carcasses and analyze the sensitivity of the grades to carcass traits and the slaughter age in Hanwoo steers. The carcass data (n = 187,279) of Hanwoo steers, which were slaughtered and graded between January 2, 2019 and May 31, 2019, were used to derive the distribution and correlation matrix for carcass traits and the slaughter age. Monte Carlo simulations were performed using @risk software. Based on the distribution and correlation matrix of the input variables (carcass traits and the slaughter age), 100,000 virtual carcass data were generated using the Latin hypercube method, and the effects of input variables on yield index, yield grade, and quality grade were evaluated. Simulation results showed that carcass weight is still a negative factor for the yield index and the yield grade in the revised grading system. The sensitivity of yield index to the input variables was similar between the current and the revised systems. It turned out that the slaughter age is also negatively correlated with the yield index and the yield grade in the revised system (P < 0.001). Under the current grading system, the quality grade improved as the ribeye area or slaughter age increased (P < 0.01), while the backfat thickness and carcass weight had no significant effect on the quality grade. However, in the revised grading system, the quality grade was significantly affected by all carcass traits and slaughter ages (P < 0.01). Assuming the other variables remained the same, the quality grade improved as carcass weight increased and back-fat thickness, ribeye area, or slaughter age decreased. In conclusion, an increase in carcass weight does not improve the yield grade in the revised carcass grading system, but it is expected that the revised system has a positive effect on reducing the feeding period before slaughter of Hanwoo steers.
$Pb(Zn_{1/3}Nb_{2/3})O_3-Pb(Zr_xTi_{1-x})O_3$세라믹의 유전 및 초전 특성
이성갑,조현무 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.10
Ferroelectric 0.05PZN-xPZT(90/10)-(0.95-x)PZT(10/90) (x=0.65, 0.85) specimens were fabricated by the solid-state reaction method, and especially PZT(90/10) and PZT(10/90) powders were derived by the sol-gel method. All specimens showed a uniform ferroelectric grain without the presence of the pyrocholre phase. Average grain size increased with an increased in sintering temperature, the values for the x=0.65 and x=0.85 specimens sintered at 125$0^{\circ}C$ were 14.4$\mu$m and 9.8$\mu$m, respectively. The dielectric constant and dielectric loss of the x=0.65 specimen sintered at 125$0^{\circ}C$ were 1247. 2.06%, respectively. The coercive field and the remanent polarization of x=0.65 and x=0.85 specimens sintered at 125$0^{\circ}C$ were 8.5kV/cm, 13$\mu$C/$\textrm{cm}^2$ and 17.2kV/cm, 28 $\mu$C/$\textrm{cm}^2$, respectively. The pyroelectric coefficient of the x=0.65 and x=0.85 specimens sintered at 125$0^{\circ}C$ were 5.64$\times$10$^{-8}$ C/$\textrm{cm}^2$K and 2.76$\times$10$^{-8}$ C/$\textrm{cm}^2$K, respectively.