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- 저자 : 이원학(Lee Won-hak) (검색결과 56 건)
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이원학,한찬훈,Lee, Won-Hak,Haan, Chan-Hoon 한국음향학회 2011 한국음향학회지 Vol.30 No.2
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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이원학,홍광진,이정구,손홍범,조윤주,Lee, Won-Hak,Hong, Kwang-Jin,Lee, Jeong-Gu,Sohn, Hong-Bum,Cho, Yun-Ju 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.1
Special attention should be directed toward the preservation of preoperative condylar position during orthognathic surgery because their positional change may leads to postoperative skeletal relapse as well as TM joint problem. Various condylar positioning devices, therefore, have been introduced and utilized in orthognathic surgery. Even though most of them provided us with improvement of surgical results, we also found some problems including limited indication, etc. For more accurately repositioning the maxilla and the mandible and its wide versatility, a newly designed maxilla and condylar positioning device based on the fixed part of cranium is introduced.
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상악골절단술 후 외전신경마비를 동반한 경동맥 해면정맥동루
이원학,김동률,홍광진,이정구,Lee, Won-Hak,Kim, Dong-Ryul,Hong, Kwang-Jin,Lee, Jeong-Gu 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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극한지 모듈러 건축물의 설계, 시공 및 거주환경에 대한 연구
이원학,송영학,임석호,Lee, Won-Hak,Song, Young-Hak,Lim, Seok-Ho 한국주거학회 2014 한국주거학회 논문집 Vol.25 No.2
This study looked at designing, building and operating temporary camp, the first structures that South Korea built in the Antarctica. While there may be differences in accordance with the topography, ground surfaces in the Antarctica are covered broken stones, glaciers and snow. Hence, such topographical characteristics should be taken into account when conducting any construction work. To ensure successful assembly construction in the Antarctica using modules, prior trial assembly work should be done in Korea to identify any possible trouble in the actual construction process. Assuming that the workers will have to spend at least one winter in the temporary camp, the work will be more severely affected by adverse weather conditions and snow drift, resulting in the need to clear snow. This can be by designing roofs with curved surfaces. Also, quantitative effects will need to be verified through simulation and actual measurement. It will also be necessary to assess the camp's thermal environment and examine its air-conditioning methods. To identify the temporary camp's thermal system, the temperatures and humidities were measured, and the heating system was designed not to offer automatic control or desired value selection functions.
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신경병 흰쥐에서 A-β신경섬유의 활동의존 전도속도의 변화
이원학(Won Hak Lee),이정구(Jeong Gu Lee),신형철(Hyung Cheul Shin) 대한구강악안면외과학회 1997 대한구강악안면외과학회지 Vol.23 No.2
Partial injury to peripheral nerves can often result in abnormal pain sensation, neuropathic pain or causalgia, which is characterized by spontaneous homing pain combined with hyperalgesia and allodynia. Neuropathic pain persists for years or decades after all possible tissue healing has occurred. Nerve injury appears to induce changes of excitability in the damaged peripheral nerve. Many of the injured A-beta axons exhibited spontaneous discharges as early as 1 day post-injury. The demyelinated region of the damaged nerve was also very sensitive to both TEA and noradrenaline, suggesting the presence of new ion channels or receptors, absent in normal, in the damaged region. However, there has been few study to test the activity-dependent excitability changes in intact axons of the neuropathic rats. The hypothesis is that impulse transmissions through the uninjured axons of either dorsal root or sciatic nerve may have been altered in neuropathic rat. To test this hypothesis we used an experimental rat model where L4 and L6 spinal nerves were tightly ligated unilaterally, leaving the L5 intact. Changes of the conduction latency were characterized following impulse activity (1 min duration, sustained stimulation, 0.5, 1, 5, 10, 25, 50, 100 and 200 Hz) in single A-beta fibers of L5 dorsal root and in peripheral sciatic A-beta fibers of neuropathic rats (L4 and L6 dorsal roots ligated) anesthetized with urethane. As a results, the profiles of activity-dependent increases of latency in A-beta fibers of L5 dorsal root of neuropathic rat were significantly stronger (P<0.01, from 50-200 Hz) than those in normal rat following different rates of impulse activity. However, activity-dependent latency changes recorded from sciatic nerves distal to the dorsal root ganglion were not significantly different between neuropathic and normal rats. These results suggest that excitability changes may have been occurred in the intact dorsal root fibers of neuropathic rat and that these changes may be related to the allodynia observed in neuropathic pain.
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이원학(Lee, Won-Hak),송국곤(Song, Guk-Gon),한찬훈(Haan, Chan-Hoon) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.1
The present study investigates the change between preliminary accreditation system results and floor impact sound evaluation in the field. In order to this, evaluation has been conducted at the construction phase before completion. The resilient materials used in the field are applied to the site using 1st grade of light-weight impact sound and 3rd grade of heavy-weight impact sound. The measurements are limited to households with extended living room, ceiling whit well type, and finishing materials with thickness of 7.5 ㎜. As a result, it was found that the difference between the performance of the resilient material through the preliminary accreditation system and the site evaluation at the pre-completion phase have been lowered by at least one grade. It was also revealed that there were about (1 ~ 5) ㏈ deviations depending on the household’s exclusive use area, the shape of the plan, the space to be measured, and the width and length ratio of the living room area to be measured. As the size of the exclusive use area and living room area increased, the grade of floor impact sound has been lowered. However, it was confirmed that the heavy-weight impact sound is most unfavorably evaluated where the width and length ratio of the living room, where measurements were undertaken, is between 1.0 and 1.1. And the floor impact sound tendency does not appear according to the floor. The research results are intended to be used as a basic data for designing the living room to secure the floor impact sound reduction performance and the introduction of the floor impact sound evaluation system before using approval inspection.
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SBR 라텍스 혼합 모르타르를 활용한 콘크리트 슬라브의 바닥충격음 개선효과
이원학(Lee Won-Hak),한찬훈(Haan Chan-Hoon) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.4
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. 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 ㎐.
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