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.

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.

실험조건에 따른 임팩트 볼의 바닥충격음 변화 고찰

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.

두개골에 기준을 둔 상악 및 과두 고정용 장치

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.

바닥마감재의 층간소음저감 성능평가를 위한 측정방법 고찰

이원학(Won-hak Lee),김용희(Yong-hee Kim),송국곤(Guk-gon Song),윤용진(Yong-jin Yoon),윤창연(Chang-yeon Yoon) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.10

모듈러 주택의 주거성능평가 : 천안 두정 모듈러 행복주택을 위주로

이원학(Won-Hak Lee),박지훈(Jihoon Park),송국곤(Gukgon Song) 한국소음진동공학회 2019 한국소음진동공학회 학술대회논문집 Vol.2019 No.10

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.

1/4 축소 지그를 이용한 무향실 확산 성능평가

이원학(Won Hak Lee),김용희(Yong Hee Kim),송국곤,최원갑(Won Gab Choi),이재학(Jae Hak Lee),이성찬(Sung Chan Lee) 한국소음진동공학회 2017 한국소음진동공학회 학술대회논문집 Vol.2017 No.4

고층건물 연돌효과로 인한 엘리베이터문에서 발생하는 소음 측정 및 평가

이원학(Lee, Won-Hak),구성한(Koo, Sung-Han),조재훈(Jo, Jae-Hun) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.4

Many previous studies have reported that the noises caused by the stack effect in high-rise buildings is one of the severe problems. This study aims to provide the information concerning the characteristics and sound pressure levels of the noises caused by stack effect. The stack effect occurs when the indoor air in the buildings is warmer than outside air. Unwanted airflows occur because of infiltration in high-rise buildings located in cold regions. The flow of air through cracks around the lobby entrance doors, elevator doors, and stairwell doors can create loud and annoying whistling. According to studies related to the stack effect, the noises cause discomfort to residents. We conducted field measurements of the noises caused by the stack effect at the elevator doors in two high-rise building. This study conducted the field measurement of the noises and analyzed the characteristics and sound pressure level of these noises. In addition, this study proposed the noise control method and evaluates the methods at elevator door. As a result, the noises were affected by difference pressure, temperature and air-tightness of elevator door. The more pressure difference and temperature difference is large, the more large the sound pressure level at elevator door. After the installation of airtight gaskets at elevator door, this way reduces the sound pressure level about 6~8dB(A).

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 ㎐.