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김청미(Cheong-Mi Kim),장백철(Beakcheol Jang ) 한국컴퓨터정보학회 2016 韓國컴퓨터情報學會論文誌 Vol.21 No.1
In this paper, we introduce indoor localization technologies categorizing them into ON/OFF switch and senor based, wireless communication based, and image based technologies. Then we describe several representative techniques for each of them, emphasizing their strengths and weaknesses. We define important performance issues for indoor localization technologies and analyze recent technologies according to the performance issues. Our analyses show that ON/OFF switch based technologies are difficult to install, but accurate and not limited by light. Wireless communication technologies are not limited by light nor distance (space) and do not need additional device. Image based technologies do not need additional device but are limited by light, and their accuracies are affected by light. We believe that this paper provide wise view and necessary information for recent indoor localization technologies.
채두병 ( Chae Du Byeong ),서경 ( Seo Gyeong ),김청미 ( Kim Cheong Mi ),이대우 ( Lee Dae U ),서석교 ( Seo Seog Gyo ),허은하 ( Heo Eun Ha ),안정미 ( An Jeong Mi ),김기황 ( Kim Gi Hwang ),홍순원 ( Hong Sun Won ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.9
Heterotopic pregnancy, simultaneous intrauterine and extrauterine pregnancy, classically was considered a exceedingly rare obstetrical phenomenon. But nowadays the natural incidence is increasing and especially in association with assisted reproductive te
이상희 ( Lee Sang Hui ),김종석 ( Kim Jong Seog ),김청미 ( Kim Cheong Mi ),김보욱 ( Kim Bo Ug ),황주연 ( Hwang Ju Yeon ),조희영 ( Jo Hui Yeong ),김두표 ( Kim Du Pyo ),이윤호 ( Lee Yun Ho ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.5
In prenatal diagnosis of neural tube defects, maternal serum α-fetoprotein (MSAFP) level in second trimester is used as a screening test. However, it shows low sensitivity with high false positive rate. Also, α-fetoprotein and acetylcholinesterase in amniotic fluid through amniocentesis is used, but it is an invasive technique with low sensitivity. Recently, due to improved prenatal sonography, typical sonographic findings of spina bifida are reported and contributed to early diagnosis and detection of possible co-existing abnormalities. We report a case of spina bifida detected at 21 weeks of pregnancy by prenatal sonograph at our institution with a brief review of literature.