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.

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.

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

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

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

근대 Olympism의 역사적 변천과정에 관한 연구

한태준,황옥철 慶星大學校 1996 論文集 Vol.17 No.2

To examine the process of historical changes of Olympism, by reviewing and analyzing all sorts of reasons at each of six stages divided according to the changes of the times of the Modern Olympic Games, the object of this study is to set the theoretic foundation necessary for establishing new direction-setting and philosophy of future Olympism. Then, the facts that have been examined so far are summarized as follows. Firstly, the Olympism, which boils down to ties among countries, peace and amateurism, has entered upon complicated and delicate phase, and it has developed into undisguised political intervention, a phenomenon of commercialism and increasing professionalism of sports. Secondly, the number of countries participating in the Olympic Games has mounted to 172 countries in the Barcelona Olympic Games while there were only thirteen countries when the Olympic Games had revived. As the result, the size of the Games has remarkably expanded. In addition, the doping problem, which has emerged as a new issue, is getting more serious. Thirdly, by provoking struggle among nations, the theory of putting victory first linked with national power, is discoloring the noble ideal of the Olympic and its fundamental spirit. In conclusion, to settle these problems, the philosophy of Olympism appropriate for the situation of the times should be established. Besides, the Olympism, based on Pierre de Coubertin's educational philosophy, should be well understood to every nation of the world. Then, the Olympiad will be the best medium for international understanding. Therefore, by being well aware of the fact that the Olympic Games are not competitions among countries but competitions among individuals and competitions with persoanl records, and understanding the philosophy and idea of Olympism, the Olymic Games should regain and develop its pure Olympic spirit.

능동 클램프 ZVS 플라이백 컨버터의 역률개선에 관한 연구

최태영,류동균,이우석,안정준,원충연,김수석 성균관대학교 2002 학술회의지원논문목록집 Vol.2002 No.-

본 논문에서는 single-stage, two-stage 두가지 역률보상(PFC)기법을 기존의 능동 클램프 플라이백 컨버터에 적용하여 역률 개선을 하였다. 삽입된 플라이백 컨버터의 능동클램프회로가 주스위치와 보조스위치의 영전압스위칭(ZVS)을 구현하며, 스위칭 손실을 줄임으로써 고효율을 얻을 수 있고, 높은 주파수에서의 스위칭이 가능하다. 하지만 일반적으로 사용되는 다이오드정류기, 평활용커패시터에 의한 낮은 역률의 문제점이 남아있다. 본 논문에서는 300W급 능동 클램프ZVS플라이백 컨버터를 설계하여 single-stage, two-stage방식을 적용, 입력역률개선을 시뮬레이션과 실험에 의해 입증하고자 한다. This paper analyzed PFC of active clamp ZVS flyback converter by adding two method PFC (Power Factor Correction) circuit - two-stage and single-stage. The addition of active clamp circuit also provide a mechanism for achieving ZVS of both the primary and auxiliary switches. ZVS also limits the turn off di/dt of the output rectifier, reducing rectifier switching loss and switching noise, due to diode reverse recovery. As a results, the proposed converters have characteristics of the reduced switching noise and high efficiency in comparison to conventional flyback converter. The simulation and experimental results show that the proposed converters improve the input PF of 300W ZVS flyback converter by adding single-stage, two-stage PFC circuit.

겔화 반응 및 열처리한 금속염화물의 결정 및 구조특성

김인태,박환서,유승곤,김환영,김준형 한국공업화학회 2003 응용화학 Vol.7 No.2

A new concept for the stabilization and solidification of volatile radioactive wastes via gelation in a simple material system is introduced in this paper. Using sodium silicate as a reaction module and phosphoric acid as a catalyst or stabilization agent. CsCl is chemically converted to thermally stable compounds. The heat-treated product at 1000℃ contained a cristobalite crystalline framework and a glassy phosphorus-rich phase with a high Cs content. The morphology looked like honey flowing on the honeycomb. From TG/DT analysis, Cs could not be vaporized below 1300℃ by changing the aging conditions and molar ratio of Si/p. As a new concept, GRSS(gel-route stabilization and solidification) could give us the chance to make the high temperature waste conditioning process more stable and economical.

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.