• Title/Summary/Keyword: Lee Ji-Ham

Search Result 189, Processing Time 0.028 seconds

Comparison of the effect of different media on the clinical outcomes of the density-gradient centrifugation/swim-up and swim-up methods

  • Kim, Eun-Kyung;Kim, Eun-Ha;Kim, Eun-Ah;Lee, Kyung-Ah;Shin, Ji-Eun;Kwon, Hwang
    • Clinical and Experimental Reproductive Medicine
    • /
    • v.42 no.1
    • /
    • pp.22-29
    • /
    • 2015

  • Objective: Sperm must be properly prepared in in vitro fertilization (IVF)-embryo transfer (ET) programs in order to control the fertilization rate and ensure that embryos are of high quality and have appropriate developmental abilities. The objective of this study was to determine the most optimal sperm preparation method for IVF. Methods: Patients less than 40 years of age who participated in a fresh IVF-ET cycle from November 2012 to March 2013 were included in this study. Poor responders with less than three mature oocytes were excluded. Ham's F-10 medium or sperm-washing medium (SWM) was used in combination with the density-gradient centrifugation/swim-up (DGC-SUP) or SUP methods for sperm preparation. A total of 429 fresh IVF-ET cycles were grouped according to the media and methods used for sperm preparation and retrospectively analyzed (DGC-SUP/Ham's F-10, n=82; DGC-SUP/SWM, n=43; SUP/Ham's F-10, n=181; SUP/SWM, n=123). Results: There were no significant differences among these four groups with respect to the mean age of the female partners, duration of infertility, number of previous IVF cycles, and retrieved oocytes. We determined that both the DGC-SUP and SUP methods for sperm preparation from whole semen, using either Ham's F-10 or SWM media, result in comparable clinical outcomes, including fertilization and pregnancy rates. Conclusion: We suggest that both media and both methods for sperm preparation can be used for selecting high-quality sperm for assistive reproductive technology programs.

  • https://doi.org/10.5653/cerm.2015.42.1.22 인용 PDF KSCI

A Study on Waveform Parameter for the Electrotactile Stimulation (경피(經皮) 전기자극(電氣刺戟)을 파형(波形) 파라메터에 관한 연구(硏究))

  • Ham, K.K.;Min, H.K.;Lee, H.J.;Huh, W.
    • Proceedings of the KOSOMBE Conference
    • /
    • v.1992 no.05
    • /
    • pp.198-202
    • /
    • 1992

  • In this paper, we have performed an experiment to obtain an optimized electric stimulation condition on the tip or a ringer skin. The desired parameters for stimulation of the finger tip skin are waveforms, frequency, stimulation intensity, duty cycle. As a result, when the finger skin was stimulated with monophasic, biphasic, and differntial phasic, the most appropriate condition was 200 to 250[Hz] in frequency, 10 to 25[%] in duty cycle. Burst type pulse was more sensitive effect than that of continuous pulse methode.

  • PDF

Design of Stabilization Algorithm for Unmanned Bicycle

  • Moon, Ji-Woon;Lee, Sang-Duck;Ham, Woon-Chul
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2001.10a
    • /
    • pp.51.3-51
    • /
    • 2001

  • In this paper, research of unmanned electric bicycle based on autonomic traveling is discussed. We derived dynamic equation of bicycle and introduced control theory that bicycle´s tilt angle and velocity is stable in some region. We implemented system using DSP processor, accelerometer and DC motor. Then, we carried out an experiment based on studied Control theory.

  • PDF