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장시영 ( Jang Si Yeong ),서경 ( Seo Gyeong ),채두병 ( Chae Du Byeong ),조시현 ( Jo Si Hyeon ),이상희 ( Lee Sang Hui ),김보욱 ( Kim Bo Ug ),이현준 ( Lee Hyeon Jun ),구자승 ( Gu Ja Seung ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.11
Intramural pregnancy is among the rarest forms of ectopic pregnancy. Since it has been first reported by Doederlein in 1913, 37 cases were reported in worldwide literatures. The pathologic criteria required for intramural pregnancy is that the product of
불가사리 추출물의 복숭아혹진딧물(Myzus Persicae) 살충활성
장자영 ( Ja Yeong Jang ),이솔 ( Sol Yi ),정이영 ( Iee Young Jung ),최은현 ( Eun Hyun Choi ),조욱희 ( Uk Hee Jo ),양시영 ( Jung Mi Seo ),서정미 ( Si Young Yang ),김인선 ( In Seon Kim ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.2
BACKGROUND: Starfish is one of major sea invertebrates that have become a serious economic threat to aquacultural farms in Korea. Much effort has sacrificed to reduce the economic losses of the farms by predatory starfish, including developing and searching biological resources for medicinal and agricultural purposes. In the present study, we investigated aphicidal activity of the extracts from the starfish Asterina pectinifera against green peach aphid. METHODS AND RESULTS: Fresh starfishes were cut into small pieces, homogenized and soaked in methanol. The methanol extracts were centrifuged and the resulting supernatant was subjected to aphicidal activity assays and a series of silica gel column chromatography. More than 70% mortality of aphids were observed by the extracts at a concentration of 1,000 mg/L, exhibiting dose-dependent mortality. TOF-MS analyses detected polyhydroxysteroid as a main aphicidal compound from the starfish extracts. Transmission electronic microscopy could demonstrate that the extracts with polyhydroxysteroid caused aphids death by affecting their epicuticular membrane. CONCLUSION(s): This is the first report of aphicidal activity of the starfish Asterina pectinifera extracts against green peach aphid. Starfish biological resources may be used as a potential candidate for developing a new type natural insecticide.
실시간 정량적 PCR 증폭기법을 통한 다운증후군의 고속 산전 진단
양영호 ( Yang Yeong Ho ),백자현 ( Baeg Ja Hyeon ),남미숙 ( Nam Mi Sug ),양은석 ( Yang Eun Seog ),길미화 ( Gil Mi Hwa ),신종승 ( Sin Jong Seung ),정용욱 ( Jeong Yong Ug ),장시영 ( Jang Si Yeong ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.12
Objective : Trisomy 21 (Down syndrome) is the most common chromosomal anomaly which occurs 1 out of 700-1000 birth. Current techniques such as amniocentesis, chorionic villi sampling (CVS), require lengthy laboratory culture procedures and high costs. Thi
이정섭(Lee Jeong Seob),장시영(Jang Si Yeong) 한국경영학회 2003 經營學硏究 Vol.32 No.5
This study explores the relationship between antecedent factors and users` acceptance of Knowledge Management Systems through extension of Technology Acceptance Model, based on the survey data from two hundred and thirty-two respondents. In order to extend the previous model, new constructs such as feeling and perceived value were added to the research model. Overall, four dependent variables-perceived usefulness, perceived ease of use. perceived value, and intention to use the system-were investigated in their relationships with antecedent variables. The results of the analysis indicated the significance of the new constructs introduced in this research. Implications of the study and suggestions for future researches were discussed.
In-situ Vacuum Hot Press 공정을 이용한 SiCp/Al 복합재료의 제조
최세원,홍성길,김영만,장시영,강창석,Choe, Se-Won,Hong, Seong-Gil,Kim, Yeong-Man,Jang, Si-Yeong,Gang, Chang-Seok 한국재료학회 2001 한국재료학회지 Vol.11 No.7
본 연구에서는 특별하게 고안된 In-situ VHP 제조 공정을 이용하여 상온에서 $500^{\circ}C$까지의 진공 열간 압축과 canning 작업 없이 $520^{\circ}C$에서 연속 압출옳 하여 Sicp/pure Al과 SiCp/2024Al MMCs를 제조하였다. 복합재료의 인장강도와 미세구조에 영향을 주는 SiC 입자크기, 체적률, 압출비에 대해서 조사하였다. 압출비 10:1의 경우에는 SiCp/pure Al과 SiCp/2024Al 복합재료 둘 다 건전한 외형과 SiCp의 일정한 분산을 가지면서 SiCp의 균열이 없는 좋은 미세 구조를 가지고 있었다. 그러나 압출비 16:1의 경우에는 체적률이 증가할수록 파괴된 SiC 입자의 수가 증가하였으며 2024Al 기지내의 복합재료와 순수한 Al 기지재 복합재료를 서로 비교하였다. 동일한 체적률과 압출비의 경우에는 SiCp의 크기가 작은 복합재료가 SiCp가 큰 복합재료보다 인장강도가 더 높았다. SiCp/pure Al and SiCp/2024Al MMCs were fabricated by in-situ VHP process designed specially just in this study which is composed of the vacuum hot press at range from R.T. to $500^{\circ}C$ and the continuous extrusion without canning process at $520^{\circ}C$. It was investigated the effect of SiC particle size, volume fraction and extrusion ratio on the tensile properties and micro structure in auf composites. In case of the 10:1 extrusion ratio, but SiCp/pure Al and SiCp/2024Al composites were shown a sound appearance and a good micro structure without crack of SiCp as well as uniform distribution of SiCp. However, in case of the 16:1 extrusion ratio, the number of cracked SiC particles more than increased in a higher volume fraction composite and 2024Al matrix composite compared with pure Al matrix one. The tensile strength of the composites reinforced smaller SiCp was higher than that of the bigger SiCp reinforced in same volume fraction and extrusion ratio.