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A Study on the Functionality of Halophytes from Coast area of Jeollanam-do
Tae-Man Ha,Yang-Joon An,Mi-Yeong Shin,Sook Park,Hak-Jae Park,Hyo-Jeong Kang,Su-Jeong Choi,Jae-Yeong Yu,Ji-Yun Jeon,Gyu-Yeon Oh 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
This study was undertaken to improve the perceived value of halophytes and contribute to the activity of the local economy by analyzing the antioxidant activity and mineral content of Suaeda japonica, Tetragonia tetragonoides, and Spergularia marina that grow wild on the mud flats and coastal areas. The total phenolic compound content found in each order is as follows: Suaeda japonica (3.674∼5.989 mg TAE/g dry wt.), Tetragonia tetragonoides (2.515∼4.471 mg TAE/g dry wt.), and Spergularia marina (2.450∼4.067 mg TAE/g dry wt.); DPPH radical scavenging and ABTS cation radical scavenging activities were also recorded in the same order. In the case of minerals, Iron(Fe) was relatively high in Suaeda japonica (960.1∼1,346.7 mg/kg), Manganese(Mn) in Tetragonia tetragonoides (197.1∼574.8 mg/kg), and Zinc(Zn) was relatively high in Spergularia marina (63.19∼216.56 mg/kg). It was confirmed that the mineral content of Suaeda japonica, Tetragonia tetragonoides, and Spergularia marina was significantly higher than that of Chinese cabbage, lettuce, leek, and spinach.
Influence of Al2O3 Content and Cooling Rate on Crystallization in Fe2O3–CaO–SiO2–Al2O3 Systems
Tae Jun Park,Joon Sung Choi,Dong Joon Min 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
The behavior of silico-ferrite of calcium and aluminum (SFCA) phases and the influence of sintered ore quality were investigatedusing a confocal laser scanning microscope to understand how the Al2O3content of iron ore affects the sintered orestructure and the crystallization behavior of SFCA in a Fe2O3–CaO–Al2O3–SiO2 pseudo-quaternary system. The experimentalresults were used to inform simulations of the heterogeneous dynamic behavior in response to the rapid temperature changesand various chemical compositions typically encountered in actual sintering processes. Increasing the Al2O3content in theFe2O3–CaO–Al2O3–SiO2 pseudo-quaternary system led to the hematite content decreasing, which affects the reducibilityof the sintered ore. The correlation between the creation of SFCA and the cooling effect associated with varying the Al2O3is discussed in detail.
Tae‐Kyun Hong,Kym‐Na‐Ra Hwang,Jun‐Ran Kim,Young‐Joon Ahn 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
The toxicity of Kaempferia galanga rhizome materials and constituents against Meloidogyne incognita second‐stage juveniles (J2) and eggs were examined. The active principles of K. galanga rhizome were identified as the phenylpropanoids ethyl (E)‐cinnamate (EC, 1) and ethyl (E)‐p‐methoxycinnamate (EMC, 2) by spectroscopic analysis. Results were compared with those of carbofuran, fosthiazate, and metam‐sodium. In direct‐contact mortality bioassay, EC (LC50, 0.037 mg/ml) was the most toxic constituent, followed by EMC (0.041 mg/ml). EC was more effective than carbofuran (LC50, 0.092 mg/ml) but less active than fosthiazate (0.002 mg/ml). EC, egg hatch was inhibited 100, 93, and 87% at 125, 62.5, and 31.25 μg/ml, respectively. EMC caused 100, 81, and 75% inhibition of egg hatch at 125, 62.5, and 31.25 μg/ml, respectively. The inhibition of two phenylpropanoids were similar or more inhibition to that of either carbofuran or metam‐sodium but was lower than that of fosthiazate. In contact + fumigant mortality bioassay, EC and EMC treatments resulted in 86 and c 73% mortality at 0.5 and 0.125 mg/g soil, respectively. The lethality of these phenylpropanoids was almost similar to that of either carbofuran or metam‐sodium but was lower than that of fosthiazate. In vapor‐phase mortality bioassay, EC and EMC were more effective in closed container than open containers, indicating that the mode of delivery of these compounds was, in part, a result of vapor action. K. galanga rhizome‐derived materials, merit further study as potential nematicides and hatching inhibitors for the control of M. incognita populations.
Effect of Developmental Lead Exposure on the Expression of Hippocampal NMDA Receptor Subunit mRNA
Kim, Tae-Wan,Chung, In-Sung,Bae, Jae-Hoon,Shin, Dong-Hoon,Lee, Mi-Young,Kim, Joon-Sik 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4
목적: in vivo 및 vitro에서 해마 신경세포의 발생단계별 NMDA 수용체 아단위 mRNA 발현에 대한 연 폭로 영향을 알아보고자 하였다. 방법: 흰쥐 해마 신경세포의 발생단계별 NMDA 수용체 NR2A, NR2B 아단위 mRNA 발현에 대한 연의 영향은 정상군과 연 폭로군의 출생 후 7일, 14일, 22일 흰쥐의 해마에서 in situ hybridization으로 mRNA 발현 정도를 densitometer로 측정하여 비교하였고, 연과 NMDA 의 세포독성은 해마 신경세포 일차배양 후 도립현미경을 이용한 형태학적인 관찰과 LDH 활성도를 이용하여 측정하였다. 결과: 연 과 NMDA 에 의한 세포독성에 대한 in vitro 실험에서 형태학적 소견과 LDH 활성도에서 해마 미성숙 신경세포와 성숙 신경세포사이의 차이가 있었으므로, 연과 NMDA 독성효과는 해마 신경세포의 발달 단계에 따라 차이가 있다. 정상군의 해마에서의 NR2A mRNA 발현은 출생 후 연령이 증가함에 따라 점진적으로 증가하였으나, NR2B mRNA 발현은 출생 후 연령이 증가함에 따라 점진적으로 증가하였으나 NR2B mRNA 발현은 연령의 증가에 따른 변화가 없었다. 연 폭로에 희한 NR2A mRNA 발현은 유의하게 감소하였으나(p<0.05), NR2B mRNA 발현은 변화가 나타나지 않았다. 만성적 연 폭로는 NR2A를 포함하는 NMDA 수용체를 감소시킬 수 있음을 알 수 있다. 결론: 연은 해마신경세포의 발생단계에서 NMDA 수용체 아단위 특히 NR2A mRNA 발현의 변화를 야기하여 시냅스 신호 전달에 영향을 나타냄을 알 수 있었다. Hippocampus
한동준,임재명,전태성,이현주 江原大學校 産業技術硏究所 1996 産業技術硏究 Vol.16 No.-
This research aims to find granulation and organic removal of the piggery wastewater with the upflow blanket filter (UBF) reactor. UASB process had the effect of high pH on the granulation phase. But teh effect was decreased after the granule formtion. The filter zone of the UBF reactor had the function of GSS and contributed to removing the organic because of its biofilm formtion. The removal rates of total COD and soluble COD were 70% ~ 80% and 60 ~80% at an influent organic loading range of 2 ~ 17.4 kgCOD/m?.d, respectively. The methane production rate with the organic removal was 0.21 ~ 0.34 ℓCH?/gCOD ? and the maximum methan production rate was 0.34 CH?ℓ/gCOD ? at the volumetric loading 5 kgCOD/m?.d.
쌍선형 유도기 모델을 위한 최적 안정화 제어기 설계에 관한 연구
李泰基,李五杰,禹靖仁,李浚柝 東義大學校産業技術開發硏究所 1992 産業技術硏究誌 Vol.6 No.-
An optimal Stabilization Technique for a bilinear induction motor model is introduced. This technique includes two parts ; the one is an stabilization control using Lyapunov Function which has the form of a sum of liner and quadratic function of the state variables, and the other is an optimalizing control using the performance index which depends on the choice of the elements of the Lyapunov matrices. Therefore, induction moter is drived with the smaller overshoot of the ones, simulation results are obtained from a digital computer.
宋埈泰,鄭仁永,李鍾德,徐東勳 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1
The thickness -extensional trapped energy mode vibrations are treated analytically. In each program the solution cinsists of a sum the dominant plate eigensolutions for shoted electrodes in the electroded resgion and for zero surface charge in the unelectroded region. The driven thickness solution is also included in the electroded region in the programs of forced vibrations. Combinations of these solutions for the infinite plate, which satisfy the differance equations and boundary conditions on the major surfaces exactry, are then employed in an appropriate variational principle of the linear piezoelectricity in order to satisfy the remaining boundary conditions at the junction between the electroded and unelectroded regions approximately.
Eisenmenger씨 증후군 산모의 긴박 제왕절개술시 전신마취 경험
김준,고우석,정종달,유병식,임경준,소금영,안태훈,한승룡 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.1
Eisenmenger's syndrome describes a situation in which the left-to-right intracardiac shunt is reversed as a result of increased pulmonary vascular resistance. The patients with Eisenmenger's syndrome are poorly tolerated and markedly increased maternal mortality to 30 - 50% during pregnancy, Physiological change of pregnancy decreases systemic vascular resistance that further aggravates the bi-directional or left shunt associated with Eisemnenger's syndrome. We report a case of 37 weeks a pregnant woman with an urgent cesarean section under general anesthesia for preterm labor. She was a pregnant patient with Eisenmenger's syndrome and did not receive antenatal care during pregnancy. Anesthesia was induced with ketamine-midazolam-fentanyl and maintained with ketamine-midazolam. The patient was ventilated with 100% O₂. Blood pressure was maintained with intravenous phenylephrine, crystalloid solution, and blood. Phenylephhne was used to maintain systemic vascular resistance (SVR). Even though the patient was carried rapid and adequate medical management, the patient was transferred to the ICU in an intubated state and died 2 days after surgery. We conclude that the parturients with Eisenmenger's syndrome require more regular, careful antenatal care, monitoring, and adequate management.