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임산부에서 발견된 경부 미주신경의 단발성 신경섬유종 1예
김래형,이수형,유순일,조정해 대한이비인후과학회 2016 대한이비인후과학회지 두경부외과학 Vol.59 No.4
Neurofibromas are benign tumors of the peripheral nerve sheath, which occur as either a solitary mass or multiple tumors in association with neurofibromatosis. Solitary vagal neurofibroma in the cervical region is very rare among neurogenic tumors. Unlike schwannomas, neurofibromas have been known to express progesterone receptor and tend to fluctuate during periods of hormonal imbalance. We report a case of a 27-year-old pregnant woman who presented with neck swelling with tenderness. The mass was more enlarged during the gestational period, and she underwent neck surgery after giving birth. At surgery, the mass was found to be originating from the cervical vagus nerve. We exerted to preserve the continuity of vagus nerve during tumor resection. Pathological examination revealed a neurofibroma. It occurred sporadically, not associated with neurofibromatosis. We should be informed that neurofibroma in pregnant woman may be more rapidly enlarged due to pregnancy-associated hormones such as progesterone. Korean J Otorhinolaryngol-Head Neck Surg 2016;59(4):309-12
김래형(Raehyeong Kim),이문용(Munyong Lee),이규현(Gyuhyun Lee),김동욱(Dongok Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Magnesium alloy is currently expected to be widely used for high lightweight and high efficient materials in the automobile and electronics industry. Although Magnesium is excellent materials, it can’t be formed in the room temperature due to HCP structure. However in order to improve the magnesium formability, it is required by the investigation of forming at warm temperature range. This study aims to confirm characteristic of formability of AZ31 magnesium alloy sheet by the warm tensile test and microstructure analysis. The formability of AZ31 magnesium was evaluated at various temperatures, strain rate, strain rate sensitivity and thickness. Furthermore the result of microstructure of AZ31 magnesium shows how grain growth is changed by thickness.
유한요소해석을 이용한 하이브리드 헤밍과 롤러 헤밍의 비교
조덕상,오명환,김래형,김지훈 한국소성∙가공학회 2021 소성가공 : 한국소성가공학회지 Vol.30 No.3
In this study, the hybrid and roller hemming processes of aluminum alloy sheets were compared using the finite element analysis. The aluminum alloy 6014-T4 sheet with a thickness of 1 mm was used for the hemming process. The mechanical properties of the aluminum sheet obtained through a uniaxial tensile test were used for the simulation. The finite element analysis of hybrid and roller hemming was performed using a commercial software (ABAQUS) by the use of the mechanical properties. The finite element simulation results showed that the hybrid hemming holds an advantage over the roller hemming in terms of the dimensional accuracy
수면호흡장애가 있는 소아의 타액 알파 아밀라아제수준과 심박동률 변이도 간 상관관계
황세환,이흥구,김래형,이수형,고기범,박찬순 대한비과학회 2016 Journal of rhinology Vol.23 No.1
Background and Objectives: The aim of this study was to evaluate the relationship between salivary alpha-amylase (sAA) and heart rate variability (HRV) indices in SDB children based on objective parameters of polysomnography (PSG). Materials and Method: This prospective study enrolled 67 children who underwent a physical examination and full-attended in-lab PSG with continuous electrocardiographic signal. The sAA were measured at night before PSG and in the early morning after PSG. Results: The subjects were divided into control [n=26, apnea-hypopnea index (AHI)≤1] and obstructive sleep apnea syndrome (OSAS, n=41, AHI>1) groups; the OSAS group was subdivided into mild (1<AHI≤5), moderate (5<AHI≤10), and severe (10<AHI) groups. The severe OSAS group was significantly different from the control and other OSAS subgroups in terms of the ratio between the low- and high-frequency components (LF/HF ratio) among the HRV indices. The LF/HF ratio was positively correlated with the sAA ratio and sAA subtraction (r=0.271; r=0.347). Conclusion: TAlthough both HRV and sAA were useful methods of predicting severe OSAS in children, a weak correlation between HRV and sAA was shown in pediatric OSAS subjects. Therefore, HRV and sAA may be independent parameters revealing different aspects of pediatric OSAS.