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구형파를 이용한 전극계면 분석용 고속 임피던스 분석기의 설계변수 확정을 위한 컴퓨터 시뮬레이션
김기련,김광년,심윤보,전계록,정동근,Kim Gi-Ryon,Kim Gwang-Nyeon,Shim Yoon-Bo,Jeon Gye-Rok,Jung Dong-Keun 한국시뮬레이션학회 2005 한국시뮬레이션학회 논문지 Vol.14 No.2
There are electric double layer capacitance, polarization resistance and solution resistance in the interface between electrode and solution. Electrode process could be evaluated by the electrical impedance analysis. The necessities of the electrochemical cell analysis with high speed impedance analyzer are followings: minimization of the effects of electric stimulation on electrochemical cell and the concentration of reactive materials, and optimization of impedance signal resolution. This paper represents the design criteria for the selection and stimulation to develop fast impedance analyzer prototype for a electrochemical cell. It was suggested that the design of 470k sample/s sampling rate, 13 bit ABC resolution, and 140ms recording time is required for high speed impedance analysis system in frequency range between dc and 10kHz.
바이오센서를 위한 PC 기반의 휴대용 고속 임피던스 분석기 개발
김기련 ( Gi Ryon Kim ),김광년 ( Gwang Nyeon Kim ),허승덕 ( Seung Deok Heo ),이승훈 ( Seung Hoon Lee ),최병철 ( Byeong Cheol Choi ),김철한 ( Cheol Han Kim ),전계록 ( Gye Rok Jeon ),정동근 ( Dong Keun Jung ) 한국센서학회 2005 센서학회지 Vol.14 No.1
For more convenient electrode-electrolyte interface impedance analysis in biosensor, a stand-alone impedance measurement system is required. In our study, we developed a PC-based portable system to analyze impedance of the electrochemical cell using microprocessor. The devised system consists of signal generator, programmable amplifiers, A/ D converter, low pass filter, potentiostat, I/V converter, microprocessor, and PC interface. As a microprocessor, PIC16F877 which has the processing speed of 5 MIPS was used. For data acquisition, the sampling rate at 40 k samples/sec, resolution of 12 bit is used. RS-232 with 115.2 kbps speed is used for the PC communication. The square wave was used as stimuli signal for impedance analysis and voltage-controlled current measurement method of three-electrode-method were adopted. Acquired voltage and current data are calculated to multifrequency impedance signal after Fourier transform. To evaluate the implemented system, we set up the dummy cell as equivalent circuit of which was composed of resistor, parallel circuit of capacitor and resistor connected in parallel and measured the impedance of the dummy cell: the result showed that there exist accuracy within 5 % errors and reproduction within 1 % errors compared to output of Hioki LCR tester and HP impedance analyzer as a standard product. These results imply that it is possible to analyze electrode-electrolyte interface impedance quantitatively in biosensor and to implement the more portable high speed impedance analysis system compared to existing systems.
김광년,김기련,엄상희,kim, Gwang-yeon,kim, Gi-Ryon,Eum, Sang-Hee 한국정보통신학회 2018 한국정보통신학회논문지 Vol.22 No.12
응급 상황에서 응급 구조사는 외상 평가와 치료가 주요 업무이다. 하지만 응급 처치를 할 수 있는 범위가 협소하며 병원의 응급실로 이송하는 일을 주로 수행하고 있다. 응급 상황에 맞는 전문의를 연결하여 원격 의료 지도를 통한 응급 처치가 이루어진다면 정확한 진단과 적절한 치료에 도움을 줄 수 있다. 본 논문에서는 응급 의료 서비스를 위한 원격 의료 지도를 지원하기 위한 앱을 개발하였다. 개발된 스마트 앱은 응급 구조사가 원격지에 있는 의사를 호출하여 응급 환자의 상태를 생체 신호와 영상으로 실시간 전송할 수 있다. 이를 통하여 환자의 상태를 정확하게 진단하는데 도움을 줄 수 있다. 또한 응급 치료를 지도할 수 있으며 응급실에서의 대응이 신속하게 이루어질 수 있도록 할 수 있다. In emergency situations, first aid workers are the main task of trauma evaluation and care. However, the scope of first-aid treatment is small and they are mainly carried out to the emergency room of the hospital. If a specialist who is in charge of an emergency situation is connected and emergency medical treatment through remote medical direction is performed, accurate diagnosis and appropriate care can be helped. This paper has developed an smart application(app) to support remote medical direction for emergency medical services. The developed smart app allows emergency rescuers to call a doctor at a remote location and transmit real-time status of emergency patients to vital sign and video. This will help to diagnose the patient's condition accurately. In addition, emergency care can be instructed and response in the emergency room can be made quickly.
엄상희,김광년,김기련,남재현,Eum, Sang-Hee,Kim, Gwang-Nyeon,Kim, Gi-Ryon,Nam, Jae-Hyun 한국정보통신학회 2018 한국정보통신학회논문지 Vol.22 No.1
최근 시간적, 공간적, 의료기술 적용의 한계를 극복하기 위하여 의료 기술과 IT 기술의 융합을 시도하고 있다. 구급 활동은 초기에 환자에 대한 1차적인 치료와 안정을 주어 병원에서 치료하기까지 환자의 생명을 구하고 위험을 최소화하는 것이다. 본 연구에서는 응급 의료 서비스에 적용할 수 있는 구급 활동을 지원하기 위한 앱을 개발하였다. 구급대원은 스마트기기의 구급활동지원 앱을 통해 구급활동 일지를 쉽게 작성하고, 환자의 상태를 실시간 모니터링이 가능하다. 특히 응급 환자의 정보화 응급 상태 그리고 의료신호를 측정하거나 환부를 촬영할 수 있으며, 이를 원격지 의료 지도 의사에게 전달하여 응급조치 및 병원 대응이 신속하게 이루어질 수 있도록 할 수 있다. In the recent years, an attempts have been made to convergence medical technology and IT technology to overcome the limitations of temporal, spatial in the medical technology applications. Emergency care is primarily intended to provide primary care and stabilization to the patient, thereby saving the patient's life and minimizing the risk until hospital care. In this study, we developed an application S/W to support emergency services for emergency medical services. Paramedics can easily keep a log of emergency activities and monitor the patient's condition in real time with this application S/W on smart devices. In particular, medical signals and information emergency status of emergency patients can be measured or photographs of affected areas can be taken. In addition, this report can be delivered to remote medical doctors for rapid emergency measures and immediate hospital response.
김광년,정동근,김기련,최병철,이정태,전계록,Kim Gwang-Nyeon,Jung Dong-Keun,Kim Gi-Ryon,Choi Byeong-Cheol,Lee Jung-Tae,Jeon Gye-Rok 한국시뮬레이션학회 2004 한국시뮬레이션학회 논문지 Vol.13 No.4
The modelling and simulation of the activation process for the heart system is meaningful to understand special excitatory and conductive system in the heart and to study cardiac functions because the heart activation conducts through this system. This thesis proposes two dimensional cellular automaton(CA) model for the activation process of the myocardium and conducted simulation by means of discrete time and discrete event algorithm. In the model, cells are classified into anatomically similar characteristic parts of the heart and each of cells has a set of cells with preassigned properties. Each cell in this model has state variables to represent the state of the cell and has some state transition rules to change values of state variables executed by state transition function. The state transition rule is simple as follows. First, the myocardium cell at rest stay in passive state. Second, if any one of neighborhood cell in the myocardium cell is active state then the state is change from passive to active state. Third, if cell's state is an active then automatically go to the refractory state after activation phase. Four, if cell's state is refractory then automatically go to the passive state after refractory phase. These state transition is processed repeatedly in all cells through the termination of simulation.
허승덕,정동근,서덕준,김광년,김기련,강명구,김리석,Heo, Seung-Deok,Jung, Dong-Keun,Suh, Duk-Joon,Kim, Gwang-Nyeon,Kim, Gi-Ryon,Kang, Myung-Koo,Kim, Lee-Suk 한국음성학회 2005 음성과학 Vol.12 No.2
Electrodermal activity(EDA) is a bio-electric signal which occurs at the skin surface during the sweating. EDA reflects the activity of the sympathetic axis of the autonomic nervous system. EDA is associated with the eccrine sweat gland at the palmar and plamar surface. This study was aimed to characterize the relationship between EDA and auditory stimulus intensities. Acoustic stimulus used in this study were 500 Hz, 1 kHz, 2 kHz of narrow band noise, which were representative of speech frequencies in audible range. Stimulus intensity between 90 and 30 dB in 10 dB within dynamic range. After deriving the minimum stimulus intensity(threshold of skin potential) which elicited skin potential, and then the latency and amplitude were derived from waveform of skin potential, each latency and amplitude were compared to stimulus intensity. The waveform of skin potential were recorded stably, and the threshold of skin potential appeared nearly the hearing threshold level of the participant. The latency was decreased and the amplitude was increased according to the increase of the stimulus intensity. These results suggest that auditory evoked skin potential can be applicable to auditory assessment and audiological diagnosis tool.
엄상희(Sang-hee Eum),김기련(Gi-Ryon Kim),김광년(Gwang-nyeon Kim),남재현(Jae-hyun Nam) 한국정보통신학회 2021 한국정보통신학회 종합학술대회 논문집 Vol.25 No.2
성대 질환과 관련한 측정 기술은 기술 축적이 늦은 상태이며, 전기성문전도(electroglotograph : EGG) 측정 장비는 외산에 의존적이다. 본 논문에서는 발성에 있어서 중요한 성대의 진동 상태, 즉 성대의 접촉양상을 간편하게 측정하여 모니터링할 수 있는 착용형 무선 전기성문전도 측정 단말기를 설계하고자 하였다. Measurement technology related to vocal cord disease is in a late state of technology accumulation, and electroglotograph(EGG) measuring equipment is dependent on foreign production. This paper seeks to design a wearable wireless electrical gate conductivity measurement terminal capable of easily measuring and monitoring the vibration state of the vocal cords, that is, the contact pattern of the vocal cords, which is important in vocalization.
허승덕,정동근,김리석,김광년,강명구,김재룡,김기련 한국음성과학회 2004 음성과학 Vol.11 No.3
This paper introduces a development of an electrical stimulator for auditory stimulation. The electrical stimulator is useful in neurotological diagnosis, audiological evaluation, candidate selection for cochlear implantation, optimal device selection and decision making of MAP strategy for severe-to-profound hearing impaired persons. The development was based on sound parameters of auditory brainstem responses and auditory electrophysiological characteristic such as effective firing of auditory nerve and recording evoked potentials during refractory period of neuron. Besides pulse parameter could adjustable by programming for more varied electrical stimulation evoked response audiometry. Using the electrical stimulator, electrical square pulse was applied to promontory, and electrically evoked auditory brainstem response and electrically middle latency response were successfully recorded in cats.