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토양조건이 Rhizoctonia solani와 Sclerotium rolfsii의 균핵형성에 미치는 영향
徐仁太,金成一,李敏雄 동국대학교 산업기술대학원 1993 산업기술논문집 Vol.1 No.-
The effect of various soil temperatures on sclerotia formation of Rhizoctonia was studied in two soil conditions. In natural soil condition the most favorble temperature was 25℃ and it resulted in 57% of sclerotium formation, but in sterilized soil condition the formation rate was 90% in temperature rage from 15 to 30℃. As the inoculum incubation terms were increased, the viability of sclerotium was decreased from 53% to 40% in natural soil, but, in sterilized soil, the viability was more active than natural soil, decreasing the viability from 92% to 89%. In the case of sclerotium rolfsii, the effect of soil temperature on the formation of sclerotium was 60% at 30℃, whereas the rate was reduced to 25% of sclerotium formation in other temperature range. In sterilized soil, varing temperature had little effect on sclerotium formation and the formation rate was over 88~91%. According to cultivation term the sclerotium formation rate was 55.6% at initiating for 12 hours, but after 32 days the rate was much decreased. In sterilized soil, sclerotium formation rate was 88.7~92.3% and this rate was not effected by length of cultivation. The observed result on sclerotium formation rate by soil depth, R.solani formed sclerotia at 76% in 0~4 and 4~8Cm soil depth. As the soil depth increased, the more number of sclerotium formation was obseved to 79.5% in 8~12Cm soil depth. On the other hand S.rolfsii could formate more many sclerotia in 0~4 and 4~8Cm soil depth than in 8~12Cm soil depth.
서인태,강형원,한승호 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.2
With the recent increase in demand for electronic devices, multi-layer ceramic capacitors (MLCCs) have become the most important core component. In particular, the next-generation MLCC with extremely high reliability is required for the 4th industrial revolution and electric vehicle applications. Therefore, it is necessary to develop dielectric ceramic materials with high dielectric properties and reliability. During the decades, electrical properties of BaTiO3 based dielectric ceramics, which have been widely used in MLCC industrial field, have been improved by microstructure and defect chemistry control. However, electrical properties of BaTiO3 have reached their limits, and new types of dielectric materials have been widely studied. Based on these backgrounds, this report presents the recent development trends of BaTiO3-based dielectric materials for the nextgeneration MLCCs, and suggests promising candidates to replace BaTiO3 ceramics.
PZT-PZN 세라믹의 미세구조가 압전 특성 및 TCC 거동에 미치는 영향
서인태,최용수,조유리,강형원,김강산,천채일,한승호 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.5
Ultrasonic sensor is suitable as a next-generation autonomous driving assist device because its lower price comparedto that of other sensors and its sensing stability in the external environment. Although Pb(Zr, Ti)O3 (PZT)-relaxor ferroelectric system has excellent piezoelectric properties, the change in capacitance is large in the daily operating temperature range due to the low phase transition temperature. Recently, many studies have been conducted to improve the temperature stability of ferroelectric ceramics by controlling the grain size and crystal structure, so it is necessary to study the effect of the grain size on the piezoelectric properties and the temperature stability of PZT-relaxor ferroelectric system. In this study, the piezoelectric properties, phase transition temperature, and temperature coefficient of capacitance (TCC) of 0.9 Pb(Zr1-xTix)O3-0.1 Pb(Zn1/3Nb2/3)O3 (PZTx-PZN) ceramics with various grain sizes were investigated. PZTx-PZN ceramics with larger grain size showed higher piezoelectric properties and temperature stability, and are expected to be suitable for ultrasonic devices in the future.
차세대 MLCC를 위한 Post BaTiO₃ (BT) 세라믹에서 산소 공공의 영향에 관한 연구 동향
서인태(Intae Seo),이가영(Ka-Young Lee),오철민(Cheol-Min Oh),강형원(Hyoung-Won Kang) 한국세라믹학회 2023 세라미스트 Vol.26 No.2
In line with the trend towards electrification in mobility, there is a demand for the development of nextgeneration Multilayer Ceramic Capacitors(MLCCs) with superior properties compared to those using the conventional BaTiO3 (BT) ceramics. For this, various high-performing ferroelectric ceramics have been proposed as post-BT materials, and numerous studies have been conducted on the role of oxygen vacancies within these materials. It has been confirmed that oxygen vacancies in the ceramic material have a significant impact on various properties such as oxygen ionic conduction, IR degradation, microstructure, aging degradation, and hardening effect, and by controlling the concentration and mobility of oxygen vacancies, it is possible to adjust these properties. We hope that research on the role of oxygen vacancies in various high-performing ferroelectric ceramics will be utilized as a foundation of knowledge for the development of next-generation MLCCs in the future.
모노리식 전고체 무기 전기변색 스마트 윈도우 연구 개발 동향
신민경,서인태,강형원,서지훈,한승호 한국세라믹학회 2022 세라미스트 Vol.25 No.3
In this review, research and development trends of monolithic all-solid inorganic electrochromic smart windows were introduced. Due to global warming, an electrochromic smart window which is effective for energy saving has been gaining a lot of attention. However, high production cost and durability issues are limiting its widespread use. Various studies have been conducted on counter electrode and electrolyte materials to improve electrochromic performance and durability as well as productivity. In addition, research on optimizing the device structure through the passivation layer and on film-type electrochromic devices using flexible substrates have also been conducted. These recent research results are expected to enable the global distribution of smart windows.