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터널굴착이 지반환경에 미치는 영향에 관한 연구 - 계룡산 터널의 시뮬레이션 결과를 중심으로 -
임형규,장윤영,Lim, Hyung-Gyu,Chang, Yoon-Young 한국지하수토양환경학회 2008 지하수토양환경 Vol.13 No.5
본 연구에서는 터널 굴착으로 인한 지하수 영향 등 지반 환경 문제 해결을 위한 합리적인 평가 방법을 정립하고 이를 국민적 초미의 관심사 중 하나인 호남고속철도 계룡산 터널 구간에 적용하므로써, 계룡산 구간을 통과하는 터널 구간에 대한 환경문제(지하수/토양)를 사전에 연구하여 최적의 대안을 도출코자 한다. 지하수 유동모델링 결과 터널 굴착에 따른 지하수의 유출 및 지하수위 강하가 발생하며 터널굴착 완료 후에 지하수위가 회복되는 양상을 보인다. 따라서 구간에 분포하는 연약구간에 대해서는 특수 그라우팅이 필요할 것으로 사료된다. In this study, impact of tunnel construction on groundwater level and flow was investigated by simulation modeling, and tried to find optimal assessment method for minimization of geo-environmental problems due to tunnel construction. As a study area, Gyerong mountain area scheduled for tunnel construction was selected and the impact of tunnel construction on geo-environment compared to situation before construction was simulated. Simulation result showed that groundwater level down was observed during tunnel construction and recovered after completion of tunnel construction.
완전 이식형 인공중이를 위한 베개형 비접촉 충전장치의 설계
임형규 ( Hyung Gyu Lim ),김종민 ( Jong Min Kim ),김민규 ( Min Kyu Kim ),윤영호 ( Young Ho Yoon ),박일용 ( Il Yong Park ),송병섭 ( Byung Seop Song ),조진호 ( Jin Ho Cho ) 한국센서학회 2005 센서학회지 Vol.14 No.2
N/A A contactless recharging device for totally implantable middle ear systems has been designed as a pillow type that the user can recharge the implanted battery with taking a rest. The proposed device uses the electromagnetic coupling between the transmitting coil and the receiving coil. To supply sufficient power for the implanted circuits, each coil uses LC resonance and the implanted device uses voltage doubler. A power MOSFET is used for switching the DC voltage of LC parallel circuit and the switching frequency demands on a programmable frequency generator which is controlled by microcontroller. In order to improve the electromagnetic coupling efficiency at specific positions of coil which may vary with the displacement of head, the optimal location of receiving coil was studied, and the 5 transmitting coils in a pillow for recharging the implant module was designed. From such a recharging experiment, it was found that the proposed device could provide the sufficient operating voltage within the distance of 4 cm between pillow and the implanted device.
FEA를 이용한 이식형 인공중이용 차동전자 트랜스듀서의 진동 모델링과 최적 설계
김민규,임형규,한찬호,송병섭,박일용,조진호,Kim Min-Kyu,Lim Hyung-Gyu,Han Chan-Ho,Song Byung-Seop,Park Il-Yong,Cho Jin-Ho 한국음향학회 2005 韓國音響學會誌 Vol.24 No.7
최근까지 개발되었던 청각 보조기 중에서 공기 전도형 보청기의 하울링 (howling) 현상과 수술 후 이소골 등 기존 음향계의 재생이 불가능한 인공 와우 (cochlear implant system)의 단점을 해결하고, 동시에 청음 명료도가 높은 음성 신호를 전달하기 위한 수단으로 연구된 것이 인공중이 (implantable middle ear hearing device) 이다. 본 연구에서는 인공중이의 음성 신호 재현을 위한 진동 장치인 차동전자 트랜스듀서 (differential electromagnetic transducer, DET)에 대한 수학적 모형화와 계의 진동을 기술하는 운동방정식을 유도하고 그 해를 구하였다. 제한된 크기와 인가 전류 $1\;mA_{rms}$ 정현파에서 최대 구동력을 얻기 위해서 전자기력에 대한 유한요소해석을 수행하였고, 결과에 의해서 자석과 코일에 대한 최적 크기를 결정하였다. 사람의 중이 내 등자뼈 (stapes)의 진동 특성과 유사한 진동을 갖는 DET를 설계하기 위해서, 진동막의 강성계수를 변화하면서 진동해석을 시뮬레이션 하였다. 설계된 DET는 마이크로 머시닝 기술에 의해서 제작하였고, 그 진동 특성을 측정 하였다. 최종적으로 측정된 진동 특성에 대한 분석을 통하여 인공중이를 위한 진동 장치로서의 적용 가능함을 확인하였다. Among various kinds of hearing aids which have been developed so far. the conventional air conduction hearing aids have some problems such as the acoustic distortion, an howling effect due to acoustic feedback. Another type of hearing aid. the cochlear implant system can be applied to the profound imparied person. However. it shows the disadvantage that there is no possibility of recovery of the acoustic organ such as ossicle. On the other hand. the implantable middle ear heaving device directly vibratos the ossicular chain and has better sound qualify. good cosmetics for appearance. and wide frequency responses so that it can overcome the defects or the conventional hearing aids. In this paper, a mathematical modeling and a momentum equation derivation of the DET has been performed. For the optimization of the structure dimension generating maximal vibrating force of the DET. the computer simulation using a finite element analysis (FEA) software has been performed. Also. the vibrating transducer has been designed to make the frequency characteristics or the transducer be similar to those of the normal middle ear. Through the experimental results, the measured vibration characteristics of the DET has been evaluated to verify the performance for the application to implantable middle ear hearing devices.
완전 이식형 인공중이를 위한 자동 충전종료형 무선 충전장치의 구현
이장우,임형규,정의성,한지훈,이승현,박일용,조진호,Lee, Jang-Woo,Lim, Hyung-Gyu,Jung, Eui-Sung,Han, Ji-Hun,Lee, Seung-Hyun,Park, Il-Yong,Cho, Jin-Ho 대한의용생체공학회 2007 의공학회지 Vol.28 No.4
In the paper, a wireless charger with the function of auto-shutdown for fully implantale middle ear hearing devices (F-IMEHD) has been designed. The wireless charger can communicate with an implant module to be turned off automatically shutdown after an internal rechargeable battery has been fully-charged by electromagnetic coupling using two coils. For the communication with an implant module, the wireless charger uses the load shift keying (LSK) method. But, the variation of the mutual inductance due to the different distance between two coils can cause the communication error in receiving the fully-charged signal from an implant module. To solve the problem, the implemented wireless charger has a variable reference generator for LSK communication. The wireless charger generates proper level of the reference voltage for a comparator using an ADC (analog-to-digital converter) and a DAC (digital-to-analog converter). Through the result of experiment, it has been confirmed that the presented wireless charger can detect signals from implantable module. And wireless charger can stop generating electromagnetic flux after an implanted battery has been fully charged in spite of variable coil distance according to different skin thickness.
정원창 구동기의 진동체 성능 평가를 위한 내이 물리모델
신동호 ( Dong Ho Shin ),임형규 ( Hyung Gyu Lim ),정의성 ( Eui Sung Jung ),성기웅 ( Ki Woong Seong ),이정현 ( Jyung Hyun Lee ),조진호 ( Jin Ho Cho ) 한국센서학회 2013 센서학회지 Vol.22 No.2
Recently, various hearing aids are developed to overcome hearing loss. There are available hearing aids, such as air conduction hearing aid, implantable middle ear hearing aid and so on. But air conduction hearing aid is inconvenience caused by howling, and ossicle chain driving type implantable middle ear hearing aid has some week point due to problem of possible nercobiosis of coupling spot along incus long process. In recent years, in order to improve these shortcomings round window (RW) driving hearing aid has been paying attention. In this paper, the physical cochlear model is proposed for a performance evaluation of the RW driving hearing aids of a transducer. In order to verify an experiment proposed on a performance of physical cochlear model, the transducer which has ossicles characteristics is used. By measuring and comparing the frequency characteristics of transducer with ossicles and human temporal bone, performance of physical cochlear model was verified. As from the result of experiment, it is expected that an implemented cochlear model is useful for evaluating characteristics of RW transducer.
의료산업 생태계 활성화를 위한 집단지성 기반의 웹 플랫폼 구축 및 서비스
이영진(Lee, Young Jin),임형규(Lim, Hyung-Gyu),서수원(Seo, Soowon) 한국IT서비스학회 2019 한국IT서비스학회 학술대회 논문집 Vol.2019 No.2
정부의 지속적 R&D투자와 인프라 구축을 통해 국내 생명·보건의료 분야의 산업규모와 기술경쟁력은 급속도로 성장하고 있다. 이같은 산업발전 속에서도, 국내 생명·보건의료 분야의 세계시장 점유율은 2% 미만(2015~2017)이며 소수의 제약·의료기기 대기업을 제외하고는 대부분이 정부투자에 의존하는 경향이 여전히 있다. 그리고 국내 기업의 대부분은 보수 성향이 강하므로 보유한 기술을 협력하거나 인프라를 공유하는 비율이 매우 낮으며, 본인 또는 지인이 보유한 정보에 의존하여 얻을 수 있는 기술로 제한되기 때문에, 우리나라 의료산업 발전이 지체되고 의료산업으로의 접근도 어렵다. 본 논문에서는 이러한 문제를 해결하기 위한 집단지성 기반의 문제해결 및 기술 중개 서비스 플랫폼을 제안하고자 한다.
이소골에 장착된 전자기 플로팅매스 진동체에 대한 집중 질량-스프링 모델의 제안
성기웅,김민우,이장우,임형규,정의성,김동욱,이명원,이정현,김명남,이규엽,이상흔,박일용,조진호,Seong, Ki-Woong,Kim, Min-Woo,Lee, Jang-Woo,Lim, Hyung-Gyu,Jung, Eui-Sung,Kim, Dong-Wook,Lee, Myung-Won,Lee, Jung-Hyun,Kim, Myoung-Nam,Lee, Kyu-Yeop 대한의용생체공학회 2009 의공학회지 Vol.30 No.2
Implantable middle ear hearing devices (IMEHDs) have been widely studied as an alternative hearing aids to solve the problems of conventional hearing aids. Vibration transducer of middle ear hearing aids is a key component because vibration characteristics of transducer is directly involved performance of hearing aids. So, the study about middle ear hearing aids concentrate on the transducers. A floating mass type transducer is most efficient. In this paper, we suggest a lumped mechanical model of electromagnetic floating mass transducer implanted on human middle ear. The proposed model enables analysis of the vibration characteristics of a floating mass transducer and prediction of the variation after implant on ossicle that offers a simple and easy to analyze. The parameters was drawn based on the components and the structures of transducer. The Lumped mechanical model was converted by the electrical-mechanical equivalent model, and simulated using PSpice. So, we investigated vibration characteristics of transducer influenced it's components. And we predict vibration characteristics of stapes footplate due to implanted transducer's vibration using combining model of transducer and human ear. To prove the feasibility of the suggested model, we fabricated a differential floating mass transducer (DFMT) as one of floating mass transducers and performed experiments using the human temporal bones.