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전치 신호처리를 통한 평판에서의 다중 충격의 위치 추적에 관한 연구
문유성(Moon, Yoo-Sung),박홍석(Park, Hong-Sug),이상권(Lee, Sang-Kwon),신기홍(Shin, Ki-Hong),이영섭(Lee, Yung-Sup) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.3
This paper presents the novel work for source localization of serial multiple impacts in a plate sructure. It is difficult to identify the source of serial multiple impacts with the current source localization techenology(SLT) because of the overlapping of dispersive wave induced by multiple impacts and the reflaction from the edge of the plate. In this paper, the new method is suggested for source localization. The method is developed based on the SLT with pre-signal processing such as some limitation for the selection of three sensors, the frequency range for TFA and impact time interval. Results from numerical simulation and experiment in isotropic plate structure are presented, which show the capability of the proposed method.
고차-시간 주파수 기술을 이용한 평판에서의 충격 위치추적
문유성(Moon, Yoo-Sung),이상권(Lee, Sang-Kwon),양홍군(Yang, Hong-Goon) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.2
The aim of this paper is to present the method of identifying the impact location on the plate. This basic research has the future purpose to achieve the human-interaction technology based on the signal processing, piezoelectric materials, and wave propagation. The present work concerning the location identification of a single impact on the plate simulated the waveform numerically generated by impact force and applied the SWFOM(sliced Wigner higher fourth order moment) to the waveform to get the arrival time differences due to impact force between three sensors attached to the plate. The simulated signal is useful to get the information for time interval for the only direct wave. This information is used the source localization by using experimental work. The measured signal is also used for source localization of a single impact based on the higher order time frequency as a novel work.
삼각망에서 변형률산출의 신뢰도와 적용례; GPS로 관측된 2011 토호쿠지진에 의한 한반도 변형
나성호 ( Sung Ho Na ),정태웅 ( Tae Woong Chung ),최병규 ( Byung Kyu Choi ),유성문 ( Sung Moon Yoo ) 한국지구물리·물리탐사학회 2013 지구물리와 물리탐사 Vol.16 No.4
삼각망에서 얻은 2차원 변위자료로부터 주축변형, 회전, 팽창등을 산출하는 안정된 계산순서를 제시하였으며, 이들 추산치의 오차가 삼각망의 면적간에 반비례하므로 자료망의 크기를 택함에 유의하여야 함을 지적하였다. 이 순서를, 2011년 토호쿠지진에 의해 발생한 한반도지역의 변위의 GPS관측자료에 적용하여 안정된 추산치들을 얻었다. A stable procedure is presented to attain most probable and unbiased estimate of principal strain, rotation, and dilatation for 2-dimensional geodetic data on triangular network. The proper network size should be chosen carefully, because the errors of these estimates of strain tensor and other associated observables grow inversely proportional to the area of station triangle. As a case study, the deformation observables for the GPS-monitored co-seismic displacement in Korea due to the 2011 Tohoku-Oki earthquake were attained accordingly.
김현수,문성인,윤문수,고병희,박상건,신동오,유성모,이승호,Kim Hyun-Soo,Moon Seong-In,Yun Mun-Soo,Ko Beyng-Hi,Park Sang-Kun,Shin Dong-O,Yoo Seong-Mo,Lee Seung-Ho 한국전기화학회 2001 한국전기화학회지 Vol.4 No.3
최근 리튬이온전지를 채용한 노트북 PC의 수요는 계속 증가하고 있으며, 노트북 PC용 전지로는 잔존용량과 사용가능 시간을 정확하게 예측하며, 스스로 최적조건으로 충방전을 제어할 수 있는 SBP(smart battery pack)를 많이 채용하고 있다. SBP는 과충전, 과방전 및 과전류로부터 리튬이온전지의 안전성을 확보하기 위한 보호회로부 (protection IC)와 잔존용량 및 사용가능시간 등의 계산을 위한 지능회로부 (smart IC)로 구성되어있다. 보호회로는 충전 및 방전 FET를 이용하여 이상전류를 차단하며, SBS(smart battery system)는 system host, smart battery 및 smart battery charger로 구성되어 있다. 향후, SBP에 사용되는 IC는 저가이면서, 소비전류가 낮고, 소형화가 요구된다. 또한, microcomputer control type의 IC를 사용하고, 최적의 알고리즘을 개발하여 잔존용량 및 사용가능시간을 정확하게 예측할 필요가 있다. 이러한 SBS 기술은 노트북 PC 이외에도 전기자전거, 전기자동차, 전력저장용, 군사분야 등 광범위한 분야에서 사용될 것으로 예상된다. Recently, the demand for notebook PC with lithium ion batteries has steadily increased and consumers require them to adopt a SBP(smart battery pack) able to predict the remaining capacity and the run time of batteries precisely. The SBP is composed of a protection If, by which safety of lithium ion batteries is maintained against overcharge, overdischarge and overcurrent, and a smart IC, which calculates the remaining capacity and the remaining run time. The protection IC shut abmormal current down by using overcharge/overdischarge FET. A SBS(smart battery system) is composed of a system host, a smart battery and a smart battery charger. The smart ICs for SBP will be required to provide a low cost, low current consumption and small size. There will need to develop a microcomputer control type IC and an optimum algorism which is able to predict the residual capacity and the residual run time precisely. SBS will apply to many kinds of industry fields such as an electric bicycle, an electric vehicle, a load levelling and a military.