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이상섭,이창헌,즈엉 짱 안,웬 호앙 티엔 코이,한형수,이재신,Lee, Sang Sub,Lee, Chang-Heon,Duong, Trang An,Nguyen, Hoang Thien Khoi,Han, Hyoung-Su,Lee, Jae-Shin 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.1
This study investigated the structural, dielectric, ferroelectric, and strain properties of (0.98-x)Bi1/2Na1/2TiO3-0.02BiFeO3-xSrTiO3 (BNT-BF-100xST, x=0.20, 0.22, 0.24, 0.26, and 0.28). All samples were successfully synthesized using the conventional solid-state reaction method and sintered at 1,175℃ for 2 h. The average grain size of the BNT-BF-100x ceramics decreased with increasing ST content. Furthermore, we observed that the ferroelectric- relaxor transition temperature (TF-R) decreased with increasing ST content, which eventually vanished in the BNT-BF-24ST ceramics. The results indicated that a ferroelectric to relaxor phase transition could be induced by ST modification. Consequently, a large electromechanical strain of 633 pm/V at 4 kV/mm was observed for the BNT-BF-26ST ceramics. These results imply that our materials have the competitive advantage of larger strain under lower operating field conditions compared with other BNT-based lead-free piezoelectric ceramics. We expect that BNT-BF-ST lead-free piezoelectric ceramics are promising candidates as a novel ternary BNT-based system and can find potential applications in actuators.
이상섭,이창헌,즈엉 짱 안,김동혁,김병우,한형수,이재신,Lee, Sang Sub,Lee, Chang-Heon,Duong, Trang An,Kim, Dong Hyeok,Kim, Byeong Woo,Han, Hyoung-Su,Lee, Jae-Shin 한국재료학회 2021 한국재료학회지 Vol.31 No.10
(Bi<sub>1/2</sub>Na<sub>1/2</sub>)TiO<sub>3</sub> (BNT)-based ceramics are considered promising candidates for actuator application owing to their excellent electromechanical strain properties However, to obtain large strain properties, there remain several issues such as thermal stability and high operating fields. Therefore, this study investigates a reduction of operating field in (0.98-x)Bi<sub>1/2</sub>Na<sub>1/2</sub>TiO<sub>3</sub>-0.02 BiAlO<sub>3</sub>-xSrTiO<sub>3</sub> (BNT-2BA-100xST, x = 0.20, 0.21, 0.22, 0.23, and 0.24) via analyses of the microstructure, crystal structure, dielectric, polarization, ferroelectric and electromechanical strain properties. The average grain size of BNT-${\underline{2}}$BA-100xST ceramics decreases with increasing ST content. Results of polarization and electromechanical strain properties indicate that a ferroelectric to relaxor state transition is induced by ST modification. As a consequence, a large electromechanical strain of 592 pm/V is obtained at a relatively low electric field of 4 kV/mm in 22 mol% ST-modified BNT-2BA ceramics. We believe that the materials synthesized in this study are promising candidates for actuator applications.
이상섭,유인순,Lee, Sang-Sup,You, In-Soon 생화학분자생물학회 1977 한국생화학회지 Vol.10 No.3
고추의 매운 성분 Capsaicin혼합체(capsaicin과 dihydrocapsaicin의 혼정)를 Aspergillus niger의 배양액 중에 첨가하면 Capsaicin은 매운 맛이 없어지고 극성이 강한 phenol성 물질로 전환된다. 이 전환된 물질을 확인하기 위하여 한국산 고추에서 분리한 Capsaicin 혼정 1g를 발효시킨후 배양액을 추출하고 silicic acid column chromatography를 행하여 360 mg의 유상 물질을 분리하였다. 이 물질중에는 vanillylamide 부분이 있다는것을 Capsaicin 표준폼의 UV 흡수 spectrum과 비교하여 확인하였다. 또한 이 물질과 표준 Capsaicin의 NMR signal를 비교하면 Capsaicin중의 직쇄(side chain) 말단에 있는 isopropyl부분의 methylproton($\tau$9.5)의 일부가 사라지고 대신 hydroxymethyl기의 두 methylene proton($\tau$ 6.5)이 새로 나타났다. 이 유상 물질은 acetate로 만들어 결정화 시키고 다시 NMR, IR, GC로 분석하였다. 이러한 결과를 종합하여 Capsaicin 혼합체의 A. niger에 의한 미생물학적 대사 물질은 $\omega$-hydroxy화합물인 trans-8-hydroxymethyl-N-vanillyl-6-nonenamide와 8-hydroxymethyl-N-vanillylnonanamide인 것을 증명하였다. When a capsaicin mixture (capsaicin and dihydrocapsaicin) was exposed to Aspergillus niger, it was transformed to more polar phenolic compounds. In order to characterize the main transformed compound, one gram of capsaicin mixture was fermented and the culture broth was extracted. After silicic acid column chromatography, 360mg of of oily product was isolated. The presence of vanillyl amide moiety in the product was confirmed by comparison of the pattern of UV absorption spectrum with of authentic capsaicin. When NMR signals of the product were compared with capsaicin, a new signal ($\tau$6.5) corresponding to the two methylene protons of hydroxymethyl group appeared at the expense of methyl protons of terminal isopropyl group of capsaicin ($\tau$9.5). The oily product was derivatized to its acetate. The acetate was also analyzed by NMR, IR, and GC. It was proved that the transformation product of capsaicin mixture was a mixture of two compounds; trans-8-hydroxymethyl-N-vanillyl-6-nonenamide and 8-hydroxymethyl-N-vanillylnonanamide.
이상섭,유화승,조정효,손창규,이연월,조종관,Lee, Sang-Seob,Yoo, Hwa-Seung,Cho, Jung-Hyo,Son, Chang-Kyu,Lee, Yeon-Weol,Cho, Chong-Kwan 대한암한의학회 2003 大韓癌韓醫學會誌 Vol.9 No.1
Recently, the occurrence and death rates of cancer have increased rapidly. Metastasis and recurrence is the most important factor of death from cancer. So inhibition of recurrence and metastasis can increase the cure rate of cancer disease. At the basic chinese traditional medicine(TCM), there are a lot of theory related to neoplasm treatment. The metastasis and recurrence of neoplasm was the basis of yudu(餘毒) on remained neoplasm cell and stagnation of blood, thermotoxo, phlegm, asthenia of healthy enerngy and stagnation of vital energy. The principles therapy of neoplasm on metastasis and recurrence was based on knowledge of the method of support the healthy energy and strengthen the body resistance, promote blood circulation to remove blood stasis, clear away heat and toxic materials, dissipate phlegm and disperse the accumulation of evils. But the major clinical features of neoplasm was to be considered in developing a treatment plan include (1) distinguish between clinical and pathologic staging - acute and chronic, (2) classification of pathologic pattern, and (3) distingction of body situation : for examples asthenia - sthenia etc. It was most important to distinguish between supporting the healthy and eliminating the evil factors and to treat differently at the root and the branch cause of a neoplasm. This paper's results indicate that identification and effective use of THM can inhibite netastasis and recurrence and then it will help increasing survival rate. Also as BioTechnology(BT) has developed rapidly nowadays, as genes related to cancer have revealed. So it will give rise to the development of searching the mechanism of herb medicines which have inhibition effects of metastasis and recurrence.
건축용 프리캐스트 콘크리트 모듈의 설계 및 안전성 검토
이상섭,박금성,Lee, Sang-Sup,Park, Keum-Sung 한국공간구조학회 2020 한국공간구조학회지 Vol.20 No.3
The purpose of this study is to develop precast concrete modules that can be used as a booth and a single-story building with a large space. This precast concrete module is originally designed to have a hexagonal facade when the upper and lower parts, which are symmetrical about horizontal connection line, are combined. A structural design was conducted to ensure structural safety of these precast concrete modules and to extend the slope of the inclined members as far as possible. Then the finite element analysis was performed to estimate the lateral and vertical deflection of complete precast concrete modular structures. And to verify the structural safety of these precast concrete modules, weight loading tests were conducted on the upper and lower modules respectively.
Capsaicin 과 그 유사체들의 생분해 매카니즘 ( 1 ) Capsaicin 혼합체의 미생물학적 ω - 산화
이상섭,유인순 ( Sang Sup Lee,In Soon You ) 생화학분자생물학회 1977 BMB Reports Vol.10 No.3
When a capsaicin mixture (capsaicin and dihydrocapsaicin) was exposed to Aspergillus niger, it was transformed to more polar phenolic compounds. In order to characterize the main transformed compound, one gram of capsaicin mixture was fermented and the culture broth was extracted. After silicic acid column chromatography, 360㎎ of of oily product was isolated. The presence of vanillyl amide moiety in the product was confirmed by comparison of the pattern of UV absorption spectrum witli of authentic capsaicin. When NMR signals of the product were compared with capsaicin, a new signal (τ6. 5) corresponding to the two methylene protons of hydroxymethyl group appeared at the expense of methyl protons of terminal isopropyl group of capsaicin (τ9.05). The oily product was derivatized to its acetate. The acetate was also analyzed by NWR, IR, and GC. It was proved that the transformation product of capsaicin mixture was a mixture of two compounds; traps-8-hydroxymethyl-N-vanillyl-6-nonenamide and 8-hydroxymethyl-N-vanillylnonanamide.