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임산부에서 복강경 충수 절제술과 개복 충수 절제술의 비교
정홍규,정준철,조규석,신응진,임철완,김형철,송옥평 대한내시경복강경외과학회 2010 Journal of Minimally Invasive Surgery Vol.13 No.2
Purpose: Although laparoscopic appendectomy is a safe and effective procedure for the management of acute appendicitis,laparoscopic appendectomy in pregnancy has not been considered the preferred procedure until recently. The aim of this study was to evaluate the safety of laparoscopic appendectomy (LA) during pregnancy as compared with the control group that underwent open appendectomy (OA) during pregnancy. Methods: The clinical data of all the patients who underwent appendectomy during pregnancy at our hospital between 2006and 2009 was collected and retrospectively analyzed. Nineteen patients underwent LA and 11 patients underwent OA. The general features of the cases, the outcomes and the fetal status were evaluated. Results: There were no significant differences in the length of the procedure, the hospital stay and the complication rate between the LA and OA groups. All the laparoscopic procedures were completed without conversion to an open operation. There were no significant differences between the two groups for premature delivery, the delivery type and the birth weight. There were no fetal losses or abortions. Conclusion: Our results demonstrate that LA was not inferior to OA in terms of the operative outcomes, the complication and both the fetal and maternal safety during 1st and 2nd trimesters of pregnancy. LA could be safely performed even in the 1st and 2nd trimesters of pregnancy using careful patient selection, safe operative techniques and the appropriate application of instruments.
정홍규,박래홍 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.9
In this paper, inspection and subpixed alignment algorithms of SMD's (Surface Mounting Devices) using fuzzy morphology are proposed. First, camera calibration is performed and then the inspection algorithm detects defects such as lead bending and breaking using the ruler generated by fuzy morphology. The SMD having no defects is tested whether it is mounted in the specified position or not. The proposed subpixel alignment algorithm detects accurately orientation and position using subpixel interpolation. It consists of two parts: preprocessing and main processing steps, in which corner points and coarse orientation of a SMD are detected, and interpolation is used to obtain final parameters with wubpixel accuracy. The computer simulation shows that the proposed algorithms give more accurate parameters, and they can be applied to fast and accurate automatic surface mounting systems.