• Journal of the KSME
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• v.52 no.1
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• pp.50-54
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• 2012

감성품질로서의 BSR(Buzz, Squeak, Rattle)은 시스템의 공진특성으로 인해 부품 간의 간극에서 발생하는 간섭현상이며, 재료의 열화 특성과 조립공차의 영향으로 확률적으로 발생하는 신뢰성 문제이다. 일반적으로 BSR 문제는 제품의 개발 과정 중 완료 단계에 발견되고 있으며 설계 사양 변경이 제한적이고 고비용의 시험에 의해 해결되어 왔다. 따라서 초기 설계 단계에서 BSR의 발생을 최소화하기 위하여 재료의 열화와 결합부 이완을 고려한 CAE를 통한 BSR 가상 평가 방법이 필요하다.

• 한국지구물리탐사학회:학술대회논문집
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• 2007.06a
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• pp.157-162
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• 2007

Geophysical survey has been conducted on the continental margin off the South Shetland Islands aboard R/V Onnuri of KORDI in 1992/1993. About 800-line km of 96-channel reflection data have been acquired. On the seismic section, BSR with strong reflectivity and negative polarity has been found at 700 ms below the sea bottom. BSR is considered as the base of gas hydrates and AVO analysis was performed to study physical properties along BSR. True amplitude recovery and surface consistence amplitude were applied to seismic data and angle gathers were obtained. AVO gradient and AVO intercept are calculated on every CDP gather. Section of AVO intercept show strong reflectivity and negative polarity on BSRs and stronger continuity of BSR than stacked section. Cross plot of intercept-gradient indicates that the lower layer below BSR is filled with free gas.

• Geophysics and Geophysical Exploration
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• v.2 no.4
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• pp.184-190
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• 1999

A study of gas hydrate is a worldwide popular interesting subject as a potential energy source. A seismic survey for gas hydrate have performed over the East sea by the KIGAM since 1997. General indicators of natural submarine gas hydrates in seismic data is commonly inferred from the BSR (Bottom Simulating Reflection) that occurred parallel to the see floor, amplitude decrease at the top of the BSR, amplitude Blanking at the bottom of the BSR, decrease of the interval velocity, and the reflection phase reversal at the BSR. So the seismic data processing for detecting gas hydrates indicators is required the true amplitude recovery processing, a accurate velocity analysis and the AVO (Amplitude Variation with Offset) analysis. In this paper, we had processed the field data to detect the gas hydrate indicators, which had been acquired over the East sea in 1998. Applied processing modules are spherical divergence, band pass filtering, CDP sorting and accurate velocity analysis. The AVO analysis was excluded, since this field data had too short offset to apply the AVO analysis. The accurate velocity analysis was performed by XVA (X-window based Velocity Analysis). This is the method which calculate the velocity spectrum by iterative and interactive. With XVA, we could determine accurate stacking velocity. Geobit 2.9.5 developed by the KIGAM was used for processing data. Processing results say that the BSR occurred parallel to the sea floor were shown at $367\~477m$ depths (two way travel time about 1800 ms) from the sea floor through shot point 1650-1900, the interval velocity decrease around BSR and the reflection phase reversal corresponding to the reflection at the sea floor.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.11a
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• pp.52-52
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• 2003

Gbit급 DRAM 커패시터의 고유전물질로 각광받고 있는 (Ba,Sr)TiO$_3$〔BST〕의 하부전극 물질로서 (Ba,Sr)RuO$_3$〔BSR〕의 적용 가능성을 연구하였다. BSR은 BST와의 구조적, 화학적 유사성으로 인하여, BST와 하부전극사이의 저유전 계면반응 충의 생성을 최소화함으로서 향상된 전기적 특성을 구현 할 수 있다. 본 연구에서는 methoxyethoxytetramethylheptanedionate(METHD) 소스를 적용한 유기 화학 기상 증착법(MOCVD)법을 이용하여 BSR을 증착하였으며, 증착된 BSR의 특성을 x-ray photoelectron spectroscopy(XPS) 분석법으로 기화기 온도 변화에 따른 BSR박막의 특성을 분석하였다. 증착온도 55$0^{\circ}C$에서 소스의 기화효율에 영향을 미치는 기화기온도를 변화시켜가며 BSR박막의 증착실험을 진행하였으며 소스 유입 속도 0.075sccm, 증착 온도 55$0^{\circ}C$, Ar/O2 = 200/350 sccm일 때 기화기 온도를 260~28$0^{\circ}C$까지 1$0^{\circ}C$간격의 변화로 증착실험을 수행하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.524-527
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• 2007

남극 반도 북부해역은 남극대륙 주변부에 존재하는 가스하이드레이트 매장 유망지역중의 하나이다. 남극반도 북부해역내에서 BSR이 가장 뚜렷이 나타나는 남셰틀랜드 군도의 대륙주변부에서 가스하이드레이트 특성 및 분포를 연구하기 위한 탄성파 탐사가 1992년, 2005년도 수행되었다. 이 지역에 나타나는 BSR은 대륙사면에서 광범위하게 발달되어있다. 이 지역 BSR에 대한 AVO 분석결과에 의하면 BSR상부지층은 높은 탄성파 속도를 갖으며 하부지층은 가스를 포함하는 것으로 밝혀졌다. 탄성파 단면에 나타난 BSR의 발견지역을 대상으로 분포도를 작성하였으며, 이 지역에 대한 추가적인 탄성파 탐사 완료 후에는 정확한 매장량과 분포가 밝혀질 것이다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.05a
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• pp.425-426
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• 2010

Recently, Most of diverse noise of vehicles has decreased competitively according to development of the automotive manufacturing technology. Especially, Passenger car manufacturers has been conducting buzz, squeak and rattle(BSR) noise test as a method of the noise evaluation tests to reduce an unpleasant sound from interior parts on the driving the car. This paper suggest a evaluation method for detecting position of noise source from measured noise signals of vehicle seats during random excitation BSR test. Hereby the BSR test procedure used the test regulation of 'G' company. The detection of noise source positions used the Sound image equipment. Through suggested the test method on this paper, an accurate analysis of noise source occurred in the BSR test will be possible.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.6 no.4
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• pp.242-248
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• 2001

A high resolution Chirp seismic profile and a multichannel seismic reflection profile were analysed to study the possibility of gas hydrate presence in the southwestern upper slope of the Ulleung Basin. The Chirp profile shows acoustic turbidity, acoustic void, and pockmarks, suggesting the presence of shallow gas in the sediments .Slope failures appear to have occurred in association with decomposition of gas hydrated sediments. A bottom-simulating reflector (BSR) is seen in subbottom depths of 60 to 110 m below the seafloor at water depths of 750 to 1130 m. The sediments above BSR are characterized by acoustic blanking probably due to amplitude reduction caused by a mixture of gas hydrate with sediments. The interval velocity above the BSR is 1,650 m/sec and it drops abruptly to 1,080 m/sec below the BSR. The sediment column between seafloor and the BSR thins with increasing water depth, which is very closely related to increasing geothermal gradient with increasing water depth in the Ulleung Basin.

• The Journal of the Acoustical Society of Korea
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• v.37 no.5
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• pp.309-316
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• 2018

Various studies have been conducted to improve the BSR (Buzz, Squeak, Rattle) noise generated irregularly while the vehicle is running. In vehicle, When an external force such as vibration or force flows into the contact surface, BSR noise is generated at the contact surfaces of nearby components. In this paper, BSR conceptually explain the kind of noise generation mechanisms and the basic principles of generation, which have been proven by observing and improving noise phenomena in automobiles over the last 10 years. Through this, it is expected that researchers who want to study BSR related improvement research not only in automobiles but also in other industries, It will be able to understand the BSR phenomenon and provide a framework for thinking out improvement ideas and to carry out further research.

• 한국신재생에너지학회:학술대회논문집
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• 2005.06a
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• pp.626-629
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• 2005

새로운 에너지 자원으로 활용 가능성을 포함하고 있는 가스 하이드레이트를 조사하기 위해 한국지질자원연구원에서는 동해일원에서 탄성파탐사를 실시하고 있다. 탄성파 반사자료로부터 가스 하이드레이트 부존여부를 확인하는 방법은 해저면과 평행하면서 위상이 반대로 나타나는 고진폭 반사파 BSR (Bottom Simulating Reflect ion)과 BSR 상부에서의 진폭감소, 하부에서 진폭증가와 구간속도 감소 등을 들 수 있다. 그러나 고진폭 반사파는 free gas 또는 실리카를 포함하는 퇴적층에서도 발생하므로 이를 구별할 수 있는 방법이 필요하다. 여기에서는 가스 하이드레이트 탐사자료에 대한 일반자료처리와 함께 가스층 존재 유무를 확인하는 방법으로 많이 이용되는 탄성파 복소분석법을 적응하였다. 가스 하이드레이트 부존 유망지역에 대해 순간진폭, 순간진폭에 대한 1차, 2차 미분, 순간위상, 순간주파수 단면도를 제작하여 중합단면도와 비교하였으며 그 결과 순간진폭단면도의 경우 강한 BSR이 나타나는 지층경계면에서 순간진폭변화 차이를 강하게 보였으며, 순간주파수 단면도의 경우 BSR지역에서 고주파에서 저주파수로 변화함을 확인할 수 있었다.

• Korean Journal of Materials Research
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• v.11 no.11
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• pp.997-1000
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• 2001

Conducting perovskite oxide, $(Ba,Sr)RuO_3(BSR)$, which has many advantages for $(Ba,Sr)TiO_3(BST)$ due to their similarity in crystal structure, lattice constant and chemical composition, was prepared on n-type Si (100) by liquid delivery metalorganic chemical vapor deposition(LDMOCVD). The deposition characteristics of BSR were controlled by gas-phase mass-transfer in the experiment. The BSR films deposited at 50$0^{\circ}C$ and oxygen flow rate of 100 sccm(standard cc/min) showed an average roughness of 22 $\AA$and resistivity of 810 $\mu$$\Omega$-cm. The roughness of BSR films with oxygen flow rate showed a close relationship with the resistivity of films. BSR (110) peak shifted toward lower Bragg angle with increase of x in the$(Ba_x,Sr_{1-x})TiO_3$. The resistivity of BSR films increased from 810 to 924 $\mu$$\Omega$-cm with increase of Ba content(x).