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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.
저작운동으로 인한 진동 잡음 신호의 경감을 위한 측두골 이식형 마이크로폰의 설계
우승탁 ( Seong Tak Woo ),정의성 ( Eui Sung Jung ),임형규 ( Hyung Gyu Lim ),이윤정 ( Yun Jung Lee ),성기웅 ( Ki Woong Seong ),이정현 ( Jyung Hyun Lee ),조진호 ( Jin Ho Cho ) 한국센서학회 2012 센서학회지 Vol.21 No.2
A microphone for fully implantable hearing device was generally implanted under the skin of the temporal bone. So, the implanted microphone`s characteristics can be affected by the accompanying noise due to masticatory movement. In this paper, the implantable microphone with 2-channels structure was designed for reduction of the generated noise signal by masticatory movement. And an experimental model for generation of the noise by masticatory movement was developed with considering the characteristics of human temporal bone and skin. Using the model, the speech signal by a speaker and the artificial noise by a vibrator were supplied simultaneously into the experimental model, the electrical signals were measured at the proposed microphone. The collected signals were processed using a general adaptive filter with least mean square(LMS) algorithm. To confirm performance of the proposed methods, the correlation coefficient and the signal to noise ratio(SNR) before and after the signal processing were calculated. Finally, the results were compared each other.
체온측정용 온도 센서 및 모니터링 텔레메트리 시스템 구현
이정현 ( Jyung Hyun Lee ),성기웅 ( Ki Woong Seong ),김명남 ( Myoung Nam Kim ),조진호 ( Jin Ho Cho ) 한국센서학회 2010 센서학회지 Vol.19 No.6
Typically, the vital signs that are representing the state of human body, are the body temperature, sphygmus, respiration and blood pressure. The body temperature is the result of metabolic regulation and human steady-state body temperature is maintained from 35.9 to 37.4 ℃ by heat regulatory center. The body temperature is indicative of infection and especially it should be monitored to requiring intensive care patients or after surgical patients. But, measuring of body temperature to a heavy workload on nursing staff has been recognized. And, the health service of nurse is limited by simple tasks such as the measurement and record of vital sign. In this paper, the body temperature monitoring telemetry system was proposed to prove the recoding and transmission of body temperature patch system according the standard(ISO TS11073-92001). We proposed the transmission protocol to suit the MFER(medical waveform format encoding rules). The telemetry patch system was implemented and it was verified by experiments.
피부에 의한 이득 감쇠를 줄이기 위한 FEA 시뮬레이션 기반의 이식형 마이크로폰 설계 및 구현
한지훈,김민우,김동욱,성기웅,조성목,박일용,조진호,Han, Ji-Hun,Kim, Min-Woo,Kim, Dong-Wook,Seong, Ki-Woong,Cho, Sung-Mok,Park, Il-Yong,Cho, Jin-Ho 대한의용생체공학회 2008 의공학회지 Vol.29 No.1
Nowadays, implantable hearing aids have been developed to solve the problems of conventional hearing aids. In case of fully implantable hearing aids, an implantable microphone is necessary to receive sound signal beneath the skin. Normally, an implantable microphone has poor frequency response characteristics in high frequency bands of acoustic signal due to the high frequency attenuation effect of skin after implantation to human body. In this paper, the implantable microphone is designed to reduce the high frequency attenuation effect of a skin by putting its resonance frequency at the attenuated range through a finite element analysis (FEA) simulation. The designed implantable microphone through the simulated results has been fabricated by manufacturing process using bio-compatible materials. By the several in-vitro experiments with pig skin, it has been verified that the designed implantable microphone has a resonance frequency around the starting part of the attenuated range and reduces the attenuation effect.
김동욱,박주만,웨이췬,임형규,박희준,성기웅,이정현,김명남,조진호,Kim, Dong-Wook,Park, Ju-Man,Wei, Qun,Lim, Hyung-Gyu,Park, Hee-Joon,Seong, Ki-Woong,Lee, Jyung-Hyun,Kim, Myoung-Nam,Cho, Jin-Ho 한국센서학회 2011 센서학회지 Vol.20 No.4
Recently, the performance of binaural hearing aids is rapidly improved with the technology advancement of wireless communication, digital signal processing, and integrated circuit design. However, the previous hearing aids developer platforms can't be applied to binaural hearing aids developing, because it has no consideration for wireless communication and binaural hearing control. Also, the previous developer platforms are not easy to use for the algorithm development, because programming languages are limited. In this paper, we designed and implemented the open platform board for binaural hearing aids developing. The designed board can be programmed by general programming language and can be used wireless communication module. In order to verify the designed open platform board, we used the volume control algorithm using two open platform board. As a result of experiment, we verified the performance of designed and implemented open platform board that was successfully operated the binaural hearing control and the wireless communication.
완전 이식형 보청기 기술 평가 기반의 새로운 이식형 음향센서 제안
조진호 ( Jin Ho Cho ),우승탁 ( Seong Tak Woo ),임형규 ( Hyung Gyu Lim ),정의성 ( Eui Sung Jung ),이정현 ( Jyung Hyun Lee ),이승하 ( Seung Ha Lee ),성기웅 ( Ki Woong Seong ) 한국센서학회 2014 센서학회지 Vol.23 No.3
Key components of implantable hearing aids are consist of an acoustic sensor that collect external sound by suppressing the body noise, a signal processor module for compensation algorithm of hearing loss, and a output transducer which has tiny size but have high efficiency, respectively. In the partial implantable hearing aids, technologies of transducer and signal processor are so matured that can be applied not too much difficulty. However, due to the difficulties in implantable acoustic sensor technology, such as minimization of masticatory sound and damage of sensor’s membrane from external impact, practical use of fully implantable hearing aids have not successful so far. In this paper, we have proposed a novel implantable acoustic sensor which has trans-tympanic structure, and is verified that the proposed method can be very useful for fully implantable hearing aids by cadaveric experiments.
수액 소진 알람시스템을 위한 동일평면형 광센서의 연구 및 제작
박효순 ( Hyo Soon Park ),김태윤 ( Tae Yun Kim ),정의성 ( Eui Sung Jung ),성기웅 ( Ki Woong Seong ),김명남 ( Myoung Nam Kim ),조진호 ( Jin Ho Cho ) 한국센서학회 2015 센서학회지 Vol.24 No.2
Intravenous (IV) infusion set is one of the most common treatment methods applied to hospitalized patients. However, it is necessary to check the injection of IV solution in order to prevent patients from any possible medical injuries. In this paper, using the optical sensors to detect exhaustion of IV solution was proposed. The optical sensor is coplanar structure composed of LED and photodiode which is installed according to focal distance of the lens. These two elements detect exhaustion of IV solution at the desired point conveniently. Through the results of experiments using various wavelength of LED (R.G.B), the blue LED was selected to the optimum light source. The suggested optical sensor can detect exhaustion of IV solution by the differences in the amount of light which is caused by properties such as total reflection, refractive index and scattering. From the implementation, the detector is applicable to both containers of IV solution, glass bottle and plastic pack. And also the result shows apparent differences according to existence of IV solution even if the IV solution color and illumination were changed.