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RISS 인기검색어
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- 저자 : 임형규(Hyung Gyu Lim) (검색결과 20 건)
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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
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.
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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.
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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 한국음향학회지 Vol.24 No.7
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.
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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.
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유성명(Yoo, Sung Myung),임형규(Lim, Hyung Gyu),홍성표(Hong, Sung Pyo) 대구과학대학교 국방안보연구소 2020 사회융합연구 Vol.4 No.2
Since the simultaneous terrorist attacks in the United States on September 11, 2001, terrorist measures have been diversified and indiscriminately carried out, maximizing the damage compared to the past. International terrorism in 2019 was 1,614 cases, down from 2,079 cases in 2018, but the death toll rose ( 18 years, 7,916 www.mofa.go.kr 8,025 in 2019 ), an important indicator that explains the recent pattern of terrorism: Foreign Ministry (www.mofa.go.kr), Global Security Cooperation (search date: 2020. 3 11). It would be true that there was no direct terrorist attack in Korea last year, but the possibility of a self-sustaining terrorist attack is becoming a reality, with social and cultural factors being derived due to the increase in international marriages with illegal aliens from foreign countries, and attempts by soldiers to join ISIS have been detected within the military. In response, Korea enacted the Anti-Terrorism Act in March 2016 and is implementing it, but some ambiguities such as the people s human rights issue and the timing of the immediate military deployment to large-scale terrorism should be raised.Based on various preceding papers and literature research materials, this paper presents the military s problems and countermeasures against advancing international terrorism.
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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.
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