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.

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.

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.

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

단기 임시주거를 위한 설계계획 및 목업을 통한 성능평가

이원학(Won-Hak Lee),이병연(Byung-Yun Lee),조영준(Young-Jun Cho) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.3

본 논문에서는 재난·재해시 이재민의 주거안전성을 확보하기 위해 단기 임시주거시설에 대한 설계 계획과 목업 제작을 통한 시공성, 주거환경성을 검증하였다. 특히, 재난•재해발생시 이주민이 응급구호시설로 인근 학교의 강당 또는 체육관을 활용하고 있지만 거주성이 확보에 문제가 있다. 이를 극복하기 위한 방안으로 30일 이내 거주하는 단기 임시주택을 제안하는 것이 연구목적이다. 이를 위해 경량이면서 단열이 확보가능한 복합패널을 선정하여 목업을 제작하였다. 복합 패널을 활용한 목업은 약 1시간안에 완성하여, 시공 용이성을 확인하였다. 또한 목업을 통해 실험실에서 결로와 누수실험을 진행하였다. 외부온도 약 0 ℃, 실내온도 약 32 ℃로 온도에서 결로현상은 발생하지 않았고, 열화상카메라를 통해 확인해보면 단열성능이 확보되는 것으로 판단되었다. 또한 시간당 60 ㎜의 강우를 모사하여 누수 실험을 진행한 결과 누수가 확인되지 않아 방수성능이 확보되는 것으로 판단된다. 본 연구는 기존 임시주거시설에서 모듈화된 평면, 시제품제작을 통한 시공용이성 확보, 향후 적재의 용이성을 확인하였다. 단열 및 방수성능이 확보되는 것을 확인하였다. 이를 통해 단기 임시주거시설에 대한 대안을 제시하였다. This paper proposes a design plan of short-term temporary housing for the victims by disaster. Also construction workability and residential environment evaluated by mock-up. In particular, in the event of a disaster, victims have lived the auditorium or gymnasium of the nearby school which is an emergency shelter. However, there was a problem of livability. Therefore, it is the purpose of study to provide temporary housing that resides within 30 days. For this purpose, a composite panel with light weight and insulation select to produce mock-up. The mock-up complete in about an hour. This is because it is made only of the composite panels. The composite panels confirm to be easy to load and construct. And mock-up evaluates insulation and waterproofing performance in the laboratory. As a result, Mock-up has insulation and waterproofing performance. This suggests an alternative to short –term temporary housing.

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

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 ㎐.

현장시험을 통한 공동주택 바닥충격음 차단성능 분석

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.