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상악골절단술 후 외전신경마비를 동반한 경동맥 해면정맥돌루
이원학,김동률,홍광진,이정구 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.2
Carotid cavernous sinus fistula(CCSF) is an abnormal communication at the base of the skull between the internal carotid artery and the cavernous sinus. Fistula is almost associated with extensive facial trauma as a result of direct or indirect forces. Most fistulas of traumatic origin develop as a result of fractures through the base of the skull, which cause the laceration of the internal carotid artery near the cavernous sinus. The signs and symptoms of CCSF are pulsating exophthalmosis, orbital headache, pain, orbital or frontal bruit, loss of visual acuity, diplopia and ophthalmoplegia. Angiography reveals a definite CCSF and a detachable balloon embolization is known to be the treatment of choice. Even though carotid cavernous sinus fistula is an uncommon complication after orthognathic surgery, several cases of CCSF due to congenital anomalies, pre-existing aneurysms and abnormally thickened maxillary posterior wall have been reported in the literature. We have experienced a case of CCSF after Le Fort I osteotomy for maxillary advancement in skeletal class III patient and the cause, pathogenesis, diagnosis and treatment of this case.
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이원학,한찬훈 한국음향학회 2021 韓國音響學會誌 Vol.40 No.6
The present study aims to investigate the influence of the water to binder ratio of finishing mortar on the floor impact sound of apartments. For this, same resilient materials Expanded Polystyrene (EPS) with constant dynamic stiffness and different mortar layers with 52 %, 66 % and 72 % water to binder ratio respectively were used to build floating floor structures on which floor impact sounds were measured in standard testing facilities. As a result, it was found that light-weight floor impact sound was transmitted well when the water to binder ratio was 52% due to the high density. In case of heavy-weight floor impact sounds, since water to binder ratio of finishing mortar becomes higher as the weight of upper layer of resilient material lighter, it was shown that the natural frequency of floating floor structure moves to 63 Hz bandwidth which eventually cause a higher sound pressure level of floor impact sound. Thus, effect of water to binder ratio of mortar on the heavy-weight floor impact sounds was investigated. 본 연구의 목적은 마감모르타르의 물결합재비가 공동주택 바닥충격음에 미치는 영향을 조사하는 것이다. 이를위하여 동일한 동탄성계수를 지닌 Expanded Polystyrene(EPS) 완충재와 52 %, 66 %, 72 % 의 물결합재비를 가진 모르타르를 활용하여 뜬바닥구조를 시공하였으며, 표준실험동에서 바닥충격음을 측정하였다. 실험결과, 경량충격음에 있어서는 물결합재비 52 % 일 때, 밀도가 높은 관계로 경량충격음 전달특성이 높게 나타났다. 마감모르타르의 물결합재비가 높아지면 완충재 상부층 질량이 낮아지고, 이로 인해 뜬바닥구조의 고유진동수가 63 Hz 대역으로 이동하게 되면서 중량충격음의 음압레벨이 높게 나타났다. 이를 통하여 마감모르타르의 물결합재비가 중량충격음에 미치는 특성을 규명하였다.
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SBR 라텍스 혼합 모르타르를 활용한 콘크리트 슬라브의 바닥충격음 개선효과
이원학,한찬훈 大韓建築學會 2010 大韓建築學會論文集 : 構造系 Vol. No.
<P>In this study, a method of construction to reduce both light-weight and heavy-weight impact noises was sought. In order to achieve the noise reduction efficiency, the structure was designed to substitute the mortar layer, the closest to the impact source, as SBR latex-modified mortar which can directly attenuates floor noise and vibration. Since mortar must has a standard of strength, series of material tests were performed to characterize the material properties using different mortar specimens mixed with 0 %, 5 %, 7 % and 9% SBR latex. The optimum mixing ratio was determined by material tests and after all 7 % SBR latex-modified mortar was prepared to investigate the effect of SBR latex on floor impact noise reduction.</P><P> The slump and strength tests also demonstrate that 7 % SBR latex-modified mortar is the optimum mixture proportion. Comparing the wet structures suggests that Specimen 2 (i.e. SBR latex-modified mortar laminate) shows better noise reduction performance over Specimen 1 (i.e. unmodified mortar laminate) by 1 ㏈ at the heavy-weight impact levels. The light-weight and heavy-weight impact tests demonstrate that the SBR latex-modified mortar generally gives better noise reduction characteristics than the unmodified mortar over the full range of frequencies except 63 ㎐ and the benefit become outstanding as the frequency reaches above 125 ㎐.</P>
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이원학,한찬훈,Lee, Won-Hak,Haan, Chan-Hoon 한국음향학회 2011 韓國音響學會誌 Vol.30 No.2
본 연구의 목적은 일본의 표준 중량충격원인 임팩트 볼을 국내의 표준중량충격원으로 도입시 바닥충격음 실험에 있어서 정확성에 대해 실험을 통해 알아보고자 했다. 이를 위하여 임팩트 볼을 이용하여 낙하 높이별, 가진위치를 바꾸어서, 수음점 높이에 대한 논의를 진행하였고, 임팩트 볼을 이용한 바닥충격음을 측정하고 이를 실제 충격원인 뛰는 충격음과 비교하여 실제 충격음과 가장 유사한 낙하 높이에 대한 검토를 실시하였다. 또한 일본 주택에서 주로 사용되고 있는 목구조와 국내 공동주택의 기본 구조인 콘크리트 구조에서의 바닥충격음 특성차이를 알아보기 위해 실험동에서 같은 조건으로 시험을 실시하여 시공재료 및 구법에 따른 차이를 알아보고자 하였다. 이에 대한 결과는 목구조에서는 낙하 높이가 10 cm에서 30 cm사이의 충격음이 실제 충격음과 비슷한 음압레벨을 갖는 것으로 나타났고 콘크리트 구조에서는 유사한 음압의 높이는 없었다. 또한 사람이 임팩트 볼을 운용하면서 표준낙하높이를 기준으로 상 하 10 cm 높이차로 생기는 오차는 역 A특성 값에서 약 1 dB이하 정도로 작은 오차를 나타내긴 하지만 우리나라에 표준 중량충격원으로 도입할 때에는 다양한 콘크리트 바닥구법에 따른 바닥충격음의 특성에 따른 적합한 임팩트 볼의 낙하 높이 및 측정 마이크로폰의 높이에 대한 고려는 신중히 하여야 한다. In Japan, bang machine has been considered to have problems about not only the impact force and frequency response which are different from the real impact sources such as children's jumping and running, but also damage in the wooden structure housing. Therefore, a new impactor for lower impact force to prevent demage in wooden structure housing was developed. The impact ball was adopted as the second standard impact source in JIS A 1418-2 and ISO 140-11. In the present study, floor impact sounds generated by impact ball with drop heights in four floors of mock-up building of Building Research Institute (BRI) similar to typical Japanese wooden structure housing were investigated and also compared to jumping sound. The results show that Impact ball sound dropped at 10 cm to 30 cm was most similar to jumping sound. And The impact sound levels at 250 and 500 Hz were more sensitive to drop height than other lower frequencies. The error that may occur from the difference of height of 10 cm up and down based on the standard drop height caused by the impact ball operated by human hands was approx. 1 dB or less only in its value of characteristic, but it must be carefully taken into Impact ball in the Korea Standard.
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Mucoepidermoid Carcinoma of the Hard Palate: a Rare Cause of Hypervascular Tumor
이원학,윤정훈 연세대학교의과대학 2003 Yonsei medical journal Vol.44 No.4
highly vascular tumor of the head and neck, with the exception a true vascular lesion, has rarely been observed. We report a rare case of a large, highly vascular, mucoepidermoid carcinoma (MEC) of the hard palate in a 28-year-old woman. The highly vascular channels were identified by ultrasonography and angiography. This case is noteworthy in that a large, highly vascular tumor of the minor salivary gland simulated a vascular lesion. When preoperative imaging demonstrates large vascular channels, preoperative angiography will benefit surgical management and embolization should be considered if possible.
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