• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 봄 학술논문 발표대회
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• pp.117-118
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• 2020

The masonry structure is constructed by cement mortar binding material of brick objects and uses reinforced hardware (connected hardware or wall tie) together when building. However, over time, the corrosion of reinforced steel and the deterioration of joint mortar as well as bricks cause the risk of collapse. In particular, when the externally decorated brick wall is installed on the concrete girder for each floor, the angle bracket is not constructed or corroded, the full-layer weight load is applied to the wall of 0.5B, which is an example of full-scale or collapse. The purpose of this study is to provide numerical information on the reinforcement design by experimentally studying the structural performance of concrete reinforcement brackets that reinforce the vertical load of the exterior wall.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.175-176
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• 2023

The masonry structure is constructed by cement mortar binding material of brick objects and uses reinforced hardware(connected hardware or wall tie) together when building. However, over time, the corrosion of reinforced steel and the deterioration of joint mortar as well as bricks cause the risk of collapse. In particular, when the externally decorated brick wall is installed on the concrete girder for each floor, the angle bracket is not constructed or corroded, the full-layer weight load is applied to the wall of 0.5B, which is an example of full-scale or collapse. As a result of the evaluation, it was confirmed that the performance was improved compared to the existing bracket, and we plan to carry out a real-life test and long-term performance review of the building using the bracket in the future.

• 한국정밀공학회지
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• 제23권8호
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• pp.145-153
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• 2006

To minimize the possible leakage of microwave when one opens the door of a microwave oven during its operation, a structural design of the reinforcing brackets for the door frame is presented. Twisting deformation of the door frame resulting from a dynamic pulling force is analyzed by harmonic and transient response analyses. Several types of the reinforcing brackets weldable to the right flange of the door frame is taken into consideration, and their effects to the twisting deformation of the door frame are compared and evaluated. As a conclusion, a thick step-shaped bracket, which is welded to whole length of the right flange, is favorable.

• 에너지공학
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• 제29권3호
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• pp.91-96
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• 2020

외부마감재인 석재벽체를 고정하는 앙카볼트와 브라켓에 대하여 초기 설계단계에서부터 기계 구조물에 요구되는 성능을 유지하고 높은 내구성을 확보가 필요하다. 이를 위해서는 하중조건을 고려한 설계 및 안전성 평가가 필요하므로 이를 검증하기 위한 방법으로 유한요소 해석기법을 적용한 구조해석을 진행하였다. 최적설계를 위해 다양한 형상에 대하여 구조해석을 실시한 결과, 볼트와 접촉되는 브라켓 후면 부위에서 발생되는 최대응력을 완화시키기 위하여 보강 구조물을 추가하였다. 또한, 브라켓에 보강판을 추가로 부착하여 L자 형상 브라켓의 응력집중을 완화하여 응력분포를 균일하게 함으로서 안전율이 기준조건에 만족하는 결과를 얻었다. 이와 함께, 반복하중에 의한 피로수명 해석까지 진행하여 피로안전계수를 분석한 결과 내구성을 검증할 수 있는 결과를 얻었다.

• 한국정밀공학회지
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• 제22권12호
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• pp.141-148
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• 2005

When one opens the door of a microwave oven during operation, microwave might leak through the clearance of the door. Present research has been motivated by the need to reduce the possible clearance by enhancing torsional stiffness of the door of the microwave oven. Static deformation of the door frame of the oven is analyzed under a door-opening force. On the basis of the topological optimization, the right flange of the door frame is shown to need reinforcing. Several types of reinforcing brackets weldable to the right flange is proposed, and their effects to the stiffness of the door frame are compared and evaluated.

• 대한건축학회논문집:구조계
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• 제33권12호
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• pp.37-44
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• 2017

Due to structural characteristics, construction costs and duration of a modular system would be saved by minimizing the schedule on the job site. As such, it is crucial to develop a connection that can guarantee stiffness while allowing for simple assembling. Particularly, the mid- to high-rise construction of the modular system necessitates the securing of the structural stability and seismic performance of multi-unit frames and connections, and thus, the stiffness of unit-assembled structures needs to be re-evaluated and designed. However, evaluating a frame consisting of slender members and reinforcing materials is a complicated process. Therefore, the present study aims to examine the structural characteristics of a modular unit connection based a method for reinforcing connection brackets and hinges while minimizing the loss of the cross section. Toward this end, the study modeled the beam-to-column connection of a modular system with the proposed connection, and produced a specimen which was used to perform a cycling loading test. The study compared the initial stiffness, the attributes of the hysteretic behavior, and the maximum flexural moment, and observed whether the model acquired the seismic performance, compared to the flexural strength of the steel moment frame connection that is required by the Korean Building Code. The test results showed that the proposed connection produced a similar initial stiffness value to that of the theoretical equation, and its maximum strength exceeded the theoretical strength. Furthermore, the model with a larger ceiling bracket showed higher seismic performance, which was further increased by the reinforcement of the plate.

• 한국기계가공학회지
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• 제17권2호
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• pp.130-136
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• 2018

This study develops a seat with electric motor technology for a one-ton grade commercial vehicle. While applying electric motor technology, the FMVSS 210 seat frame strength test is also conducted to examine the product's weak parts. The seat frame strength test used the FMVSS 210 test standard and the ANSYS program was used to simulate the test and identify weak parts in the deformation and strain values. The test results showed that the cushion frame and slide rail connection bracket were fractured at loads of about 10,000 N. Similarly, the maximum stress and strain values in the bracket were obtained in the simulation results. On this basis, it was evaluated that the connection part bracket was a considerably weak part in the case of the first model, and changing the shape of the bracket and reinforcing the strength were required. In addition, the seat belt anchorage test results and simulation results were compared to assure their validity. In the comparison results, the error for each is about 5-10%. Therefore, the simulation performed in this study is considered to have produced reasonably accurate results.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 춘계학술대회 논문집
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• pp.658-664
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• 2012

This paper presents an investigation into driveline clonk noise of midi-bus. Test was performed for operational acceleration and pressure, torsional vibration of driveline and FRF to TPA. Wavelet analysis was used to study spectral-time characteristics to all measurement data and specially for torsional vibration, lash analysis was carried out. To investigate the path of the clonk in detail, time domain TPA was introduced. With time domain TPA, the contribution of each path for the clonk was estimated by both subjectively and objectively. As a result, Transmission mount part was came to light as the main contributor of issued clonk. This was verified by reinforcing the bracket of transmission side. And 1D torsional nvh performance simulation model was built with measured torsional vibration. The simulation tool was used for prediction of some clonk behavior in tip in-out transient condition.

• 대한치과교정학회지
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• 제40권2호
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• pp.87-94
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• 2010

전단결합강도를 강화하기 위해 레이저를 이용한 부식과 산을 이용한 부식의 비교 연구가 많이 진행되어왔다. 본 연구에서는 Er,Cr:YSGG laser와 전통적인 산부식법을 혼합한 방법의 전단결합강도의 변화에 대한 평가를 하고자 한다. 교정적인 목적으로 발치된 64개의 건전한 소구치를 이용하여 16개씩 4개의 군으로 나누었다. 첫 번째 군은 37% 인산을 15초 적용시키는 전통적인 부식 방법을 택하였고, 두 번째 군은 물방울레이저로 1.5 W로 10초간 부식시킨 후 전통적인 산부식 방법을 시행하였다. 세 번째 군은 두 번째 군과 같지만 산부식을 먼저 시행한 후 물방울레이저로 부식시켰다. 네 번째 군은 물방울레이저를 이용하여 1.5 W로 15초간 부식시켰다. 이후 전단결합강도의 측정 및 치아 표면의 특징 관찰, 그리고 접착제잔류지수를 평가하였다. 두 번째, 세 번째 군은 첫 번째, 네 번째 군에 대하여 전단결합강도가 높게 측정되었다. 하지만 두 가지 기법의 복합사용 순서를 달리한 두 번째, 세 번째 군 사이에는 통계적으로 유의한 차이가 나지 않았다. 기존 산부식을 이용한 브라켓 접착법보다 산부식과 Er,Cr:YSGG laser를 복합적으로 사용 시, 향상된 전단결합강도를 얻을 수 있다.

• 치위생과학회지
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• 제15권6호
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• pp.768-774
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• 2015

본 연구는 만 6세부터 18세까지를 대상으로, 2007~2013년도 국민건강영양조사 원시자료를 이용하여 치면열구전색 수혜량을 파악하고, 수혜량에 미치는 요인을 분석하고자 10,416명을 대상으로 조사하였다. 분석에는 STATA 11.0을 이용하였으며, 분석한 결과 다음과 같은 결론을 얻었다. 7년간의 치면열구전색 수혜량은 평균은 1.12개로 나타났으며, 치면열구전색의 급여화가 시행되기 전인 2007~2009년 11월까지는 평균 0.93개, 급여화 실시 후에는 1.24개로 증가하였다. 일반적 특성에 따른 치면열구전색 수혜량은 소득수준이 높을수록, 건강보험과 민간보험에 가입되어 있을수록, 1일 칫솔질 횟수가 많을수록 높게 조사되었다. 하지만 성별과 연령의 경우는 통계적으로 유의한 차이를 보이지 않았다. 치면열구전색 수혜량에 영향을 미치는 요인으로는 치면열구전색 급여화 여부, 소득수준, 건강보험 유형 및 민간보험 가입 여부, 1일 칫솔질 횟수로 나타났다. 이상의 결과를 종합해보면 치면열구전색 급여화가 시행된 2009년 12월을 기준으로 2010년에 치면열구전색 수혜량 증가를 보이긴 하나, 그 2011년부터는 다시 감소하는 경향을 보이고 있다. 치면열구전색 수혜량을 늘리기 위해서는 치면열구전색 급여화에 대한 홍보를 강화하고, 저소득층에 대한 지원확대 및 사회경제적 수준에 따른 본인부담금 차등화 등의 방안이 논의되어야 할 것으로 생각된다. 또한 치면열구전색 급여화를 시작으로 추후에는 예방처치에 대한 급여화 확대방안에 대해 다각적인 검토가 필요할 것이다.