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Pyeong Soo Kim,Woo-Keun Kwon,Joo Han Kim,Youn-Kwan Park,문홍주 대한말초신경학회 2016 The Nerve Vol.2 No.2
Objective To compare surgical time and operation preparing time, as well as clinical outcome of unilateral carpal tunnel release (CTR) between the groups which used tourniquet and those whom did not. Methods Of 53 cases of unilateral CTR under local anesthesia from 2011 to 2015, 35 were performed by using forearm tourniquets, while the other 18 were done without using tourniquets. The two groups were compared in terms of surgical time, total operating room(OR) time, preparing time and post-operative clinical outcomes by patients’ satisfaction with the service. Results The mean surgical time was slightly shorter in cases performed with forearm tourniquets (31.63±6.86 vs. 33.33±4.75 min, p>0.05), however did not show any statistical significance. The mean total OR time (53.20±9.26 vs. 51.22± 7.03 min, p>0.05) also did not show any statistically significant differences between groups. However, the mean preparing time for surgery was shorter in the no-tourniquet group with statistical significance (17.89±4.44 vs. 21.57±7.72 min, p=0.03). All 53 patients revealed excellent or good surgical outcome, and there were no difference between two groups. Conclusion The use of forearm tourniquet in unilateral CTR operation under local anesthesia did not influence the actual surgical time nor the clinical outcomes, however did significantly reduce the preparing time for surgery. Therefore, considering the additional time needed for preparation without advantage on the surgical time or clinical outcomes, the use of tourniquet for this specific procedure is not optimal but optional, and can be selected following the surgeons preference.
Development of the ANN for the Estimation of Earth Parameter and Equivalent Resistivity
Ji Pyeong-Shik,Lee Jong-Pil,Shin Kwan-Woo,Lim Jae-Yoon,Kim Sung-Soo The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Power Engineeri Vol.a5 No.4
Earth equipments are essential to protect humans and other types of equipment from abnormal conditions. Earth resistance and potential must be restricted within a low value. An estimation algorithm of earth parameters and equivalent resistivity is introduced to calculate reliable earth resistance in this research. The proposed algorithm is based on the relationship between apparent resistances and earth parameters. The proposed algorithm, which approximates the non-linear characteristics of earth by using the Artificial Neural Network (ANN), estimates the earth parameters and equivalent resistivity. The effectiveness of the proposed method is verified with case studies.
고출력 레이저를 이용한 스테인리스강의 부분 용입 용접시 기공 억제를 위한 기초 연구
전재욱(Jae-Ook Jeon),송무근(Moo-Keun Song),김관(Kwan Kim),김평수(Pyeong-soo Kim),김종도(Jong-Do Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, an experiment was conducted to suppress porosities that may occur during partial penetration welding of stainless steel using high-power lasers. In order to suppress porosity generation, bead welding was performed by varying the defocus distance and laser irradiation angle, resulting in minimizing the porosity.