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.

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.

Nematicidal and egg‐hatching inhibition activities of Kaempferia galanga rhizome‐derived materials and constituents toward root‐knot nematode (Meloidogyne incognita)

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

The Thought and Literary Achievement of Hong Tae-yong

KIM TAE-JOON,S?l Sun-bong(번역자) The Academy of Korean Studies 1988 Korea Journal Vol.28 No.5

흰쥐에서 방광경부 부분폐쇄의 제거가 방광근의 수축력에 미치는 영향

김준철,윤재영,황태곤,박용현,김광명 大韓泌尿器科學會 1997 Korean Journal of Urology Vol.38 No.12

초음속 노즐유동에 관한 일차원 해석법

김태호,이영기,이호준,김희동 安東大學 1996 安東大學 論文集 Vol.18 No.1

Many real flows through supersonic nozzles essentially include viscous friction, heat transfer, and also mass bleed in some cases. Frequently these make a prediction for the nozzle flow difficult as well as an engineering design for the nozzle impossible. The objective of the present study is to present a simple analytical method available to design a supersonic nozzle or diffuser. Wall friction, heat transfer, and mass addition/bleed are involved to one-dimensional calculation for an isentropic flow with area change. It is found that sonic point is not always located at the geometrical throat of supersonic nozzle. This result is very important for determining the critical mass flow rate through the nozzle and thrust. One interesting result shows that shockless transition from supersonic flow to subsonic flow is theoretically possible for a real nozzle flow.

저신장증 환아에서 인슐린양 성장인자-I 조절유전자의 점돌연변이에 관한 연구

김병준,박태관,장현하,정인경,김성운 경희대학교 유전공학연구소 1995 遺傳工學論文集 Vol.7 No.-

Aging is on the same line of birth, growth and death. So we analysed IGF-I promoter DNA profiles and sequences of normal short stature (NSS) patients for the purpose of comprehension of aging. We tested 52 NSS patients with DNA sampling. First we screened NSS DNAs with PCR (polymerase chain reaction) - SSCP (single strand confirmational polymorphism) method. We found only 1 patient out of 52 had abnormal SSCP band. Then we moved to subcloning of this PCR product into _(p)T7blue T-vector. We sequenced this DNA using antisense specific primer and 35S-dATP. Finally we confirmed two point mutations at the position of +8 and +74 from transcription initiation site. Next step for this study, we planned to transfection study for promoter function and gel retardation assay for new transcription factors.

韓國産 木犀(물푸레나무)科 植物에 關한 本草學的 硏究

李泰煥,金台睍,宋昊埈,辛民敎 한국전통의학연구소 1999 한국전통의학지 Vol.9 No.1

For the purpose of developing Korean Herbalogy with the plants of Oleceae which grow wild and is planted in Korea, the these and writings on herbalogy, from literature of successive generations, have been thoroughly investigative and the results obtained were as follows: 1. According to sum of 101 species in Oleaceae family they were classified into Syringa genera 29, Ligustrum genera 24, Fraxinum genera 20, Osmanthus genera 20, Forsythia genera 8, Albeliophyllum genera 8. Thus it was noticed that Syringa genera was the main kind, some 29% in total. 2. There were totaled 19 genera and 101 species in Korea and among them modecinal plants are 6 genera, 28 species, in total but the number of species may be added because of similar plants. 3. According to the oriental name which can be used for medical purpose, the medicinal plants beloning to the Oleaceae fimily were classified as Fructus 3, Folium 5, Radix 4, Flos 3, Cortex 4, Lignum. Thus it was noticed that Folium was the Main kind. 4. According to the number of species of the origin plants about each chinese materia medicals, they were classified into FRUCTUS FORSYTHIAE 6, FRUCTUS LIGUSTRI 3, CORTEX FRXINI 2, FRUCTUS SYRINGA 3, FRUCTUS LIGUSTRUM OBTUSI FOLIO 2, FLOS JASMI NUDIFIORUM 1, FLOS JASMINI SANBAC 1. 5. According to nature and foavour of medicinal plants, they were classified into cold, cool ; 9, balance ; 6, wormth ; 3. Thus it was noticed that cold, cool is the main in nature and flavour of medicinal plants unidentified 3. 6. According to the Properties and Principal Curative action, they were classified into, clearing up heat and toxin 7, medicines for rehulating the flow of gi and allevating pain 3, resolving phlegm and cough, invigorating kidney and liver 2, clearing up heat and moisture, healthiness eleminating bloodstasis and aleviating pain, grgulating the flow of gi and invigorating blood circulation 1 each. 7. Comparing o whole medicinal plants 20 kinds, toxic durgs include minor toxin were 3 kinds, 7% of the whole. Thus toxic durgs were rare. From this result, it was revealed that the plants for medical purpose in Oleaceae was 28 kinds of the whole, in which Folium was mostly abundunt, were distributed (over) the whole country (widly) that it will be used for clinical treatments more easily. For (about) unidentifical drugs, it is considered that many experiments and clinical approaches must be continued.

소아외상 환자에 대한 임상적 연구

한태근,최준 인제대학교 1993 仁濟醫學 Vol.14 No.3

현대사회가 발달하면서 거주의 형태나 생활의 양식이 변하고 있다. 특히 도시의 경우에는 아파트의 밀집, 핵가족화, 여성의 사회참여 등으로 소아의 보호여건이 변하고 있으며 그 외상의 원인 및 상황도 다양한 유형으로 나타나고 있다. 저자는 밀집저주지역에서 소아외상환아를 조사 분석하여 소아외상의 이해와 그에 따른 예방 대책을 세우고자 1989년 9월 1일부터 1970년 8월 31일까지 인제대학교 상계백병원 응급실로 내원한 1452명을 대상으로 장소별, 시간별, 원인별, 보호자의 유무, 외상의 원인된 물체 등으로 분석하여 다음과 같은 결과를 얻었다. 성별비로는 남자가 전체의 67.2%로 더 많았으며 연령별로는 걸음마기(2∼4세)가 47.0%로 가장 많았으며 외상이 가장 많이 발생한 시간은 18시부터 21시 사이였다. 외상의 발생 장소는 54.2%가 집안이었으며 78.7%에서 사고 당시 보호자가 주위에 있었고 더구나 외상에 원인 중 21.5%가 부모의 과실이나 체벌 등이었다. 외상의 원인이된 물체는 특이한 것 없이 행동반경 내의 모든 것이 그 대상이었다. 이상의 결과로 미루어 소아 보호환경의 개선, 안전교육 강화, 놀이기구와 놀이터시설의 안정성 확보등의 대책도 중요하지만 아울러 부모들의 어린이의 안전에 대한 관심이 소아외상 발생을 줄이는 가장 중요한 길이라 하겠다. With the development of contemporary society, forms of residence and ways of life are changing. Particularly in cities, the conditions of child protection are undergoing changes, and the causes and circumstances of pediatric trauma are found in diverse patterns, owing to the trend toward concentrated apartment houses, nuclear familiesm women's social participation, etc. In order to understand and take preventive measures against pediatric trauma through surveying and analyzing externally wounded children in concentrated residential areas. I examined 1452 children who came to the emergency room of Sanggye Paik hospital, Inje University, by place, time, cause, causative object, of their external wounds, and their protector, from Sept. 1, 1989 to Aug. 31, 1990, securing the following result : In sexual distribution ratio, males are 67.2% of the whole. a ratio exceeding that of females. By age, toddler(2-4 years of age) are 47.0%, a percentage higher than that of any other age bracket. By time, most external wounds took place at 18:00-21:00 o'clock. As to place, 54.2% was at home. In cases of 78.9% some protector was nearby at the time of accident. Moreover, 21.5% of the causes of wounds was their parents carelessness or physical punishment by the same. Objects causative of trauma were anything with no distinction in an action radius. In view of the foregoing result, we may come to the conclusion that necessary steps against pediatric trauma are the improvement of protective surroundings for children, the intensification of safety education, the security of safe playthings and playgrounds, etc., but the most important of all is parents' interest in the safety of their children.