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심형석(Hyungseok Sim),최규성(Kyusung Choi),고정환(Jeonghwan Ko) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
This paper considers the probabilities and modes of flight failure of space launch vehicles(SLVs) to be used as input data for the flight safety analysis of a launch vehicle. Usually, the estimation of the failure rate of newly developed space launch vehicles uses actual flight records of launch vehicles developed under similar circumstances or SLVs reliability analysis like FMECA (Failure Mode Effects and Criticality Analysis). Herein, utilizing historical flight experience of other vehicles based on methods presented by US FAA(Federal Aviation Administration) and Australian SLASO (Space Licensing And Safety Office), we review the estimation methods of launch failure rate of newly developed space launch vehicles. In addition, we consider failure modes and the rates of the modes for flight safety analyses of a space launch vehicle.
갑상선유두암에서 갑상선전절제술과 중심경부림프절절제술 후 발생하는 저칼슘혈증 예측 인자 연구
이옥주(Ok Joo Lee),김형철(Hyung Chul Kim),임철완(Cheol Wan Lim),신응진(Eung Jin Shin),조규석(Gyou Suk Cho),정준철(Jun Chul Jung),정귀애(Gui Ae Jung),김지선(Zisun Kim),정재홍(Jae Hong Jeong),최규성(Kyusung Choi),한선욱(Sun Wook Han),허 대한갑상선-내분비외과학회 2015 The Koreran journal of Endocrine Surgery Vol.15 No.3
Purpose: Total thyroidectomy with central lymph node dissection (CLND) is a treatment modality of choice for thyroid cancer. Hypocalcemia is the most common complication after total thyroidectomy. The aim of the current study was to determine the association between surgery-related clinical factors and postoperative hypocalcemia. Methods: A prospective analysis was performed for 101 patients who underwent total thyroidectomy with CLND for papillary cancer from June 2013 to June 2014. Correlation between clinicopathologic factors and postoperative hypocalcemia was analyzed. Results: Based on the postoperative day-2 calcium, 56 patients (55%) developed hypo-calcemia and 45 patients (45%) were normal. No significant differences in histopathologic (tumor size, tumor focality, histologic type, number of retrieved lymph nodes, metastatic lymph node, thyroiditis, retrieved parathyroid gland) findings were observed between the hypocalcemia group and normal calcium group. Mean value of the postoperative day-0 parathyroid hormone (PTH) was significantly lower in the hypocalcemia group (hypoca1cemia group: 14.3±9.4 pg/mL; normal group: 25.0±16.4 pg/mL; P<0.001). In logistic regression analysis, postoperative PTH was a factor significantly affecting postoperative hypocalcemia (OR 0.93; CI: 0.90-0.97; P<0.001). In ROC analysis, the cut-off value of PTH was 19.965 (sensitivity 79%, specificity 58%), and area under the curve (AUC) was 0.709 (95% CI: 0.607-0.811). Conclusion: Postoperative PTH was a factor predicting hypocalcemia after total thyroidectomy with CLND. Use of postoperative PTH as a screening tool for prediction of postoperative hypocalcemia would be useful in management of patients with hypocal-cemia.