로드셀을 이용한 요류검사기의 구현 및 평가

정도운,조성택,남기곤,정문기,전계록 한국센서학회 2004 센서학회지 Vol.13 No.6

In this study, a uroflowmetry system was developed to detect a voiding symptom conveniently at home or hospital. A implemented hardware was composed of mechanism and system circuit part, the software was developed to process uroflow data, graph display, extraction of parameter, and evaluation of congregate rate so as to analysis obtaining uroflow data. The following experiment was performed to evaluate an ability of classification and fitness. The curve pattern of uroflow was classified into each symptom. Various parameters were calculated in the curve pattern of each uroflow as follows. The parameters are MFR, AFR, VOL, VT, and FT. A significant difference among parameters was examined by a statistical analysis for extracted parameters between normal and abnormal experimental group. The uroflow data with the various symptom was divided into normal and abnormal group using fuzzy classifier. The result of the fuzzy classification using MFR and AFR was superior by 91.23 % than grouping evaluation including VOL.

커프 압력 조절에 따른 혈류량 변화 평가를 위한 임피던스법의 구현

정도운,배진우,손정만,예수영,최병철,남기곤,김철한,전계록 한국센서학회 2004 센서학회지 Vol.13 No.6

In this study, we measured the blood flow on arm by non-invasive method and implemented a system to measure variation of the blood flow by estimating bio-electrical impedance and arterial pressure according to cuff pressure. The implemented system measured impedance variation according to pressure variation applied by artificial cuff pressure on the measuring position. The system consisted of pressure measuring part and impedance measuring part using 4-electrode method. Pressure measuring part was composed of semiconductor pressure sensor and electronic circuit for signal processing of sensor output signal. In addition, impedance measuring part was composed of constant current source circuit and lock-in amplifier for detecting impedance signal. We conducted experiments of impedance measuring part using standard resistance for performance evaluation of the implemented system. In addition we experimented to estimate variation of the blood flow by measuring impedances of the experimental group. We estimated ratio of the blood flow resistance using mean arterial pressure and variation of the blood flow. As a result the ratio of the blood flow resistance and variation of blood flow were in an inverse relationship with each other and the correlation coefficient was -0.96776.

하부요로 폐색 진단을 위한 요류음 주파수 분석

정도운,전계록 한국센서학회 2007 센서학회지 Vol.16 No.3

The aim of this study is to acquire useful information of lower urinary tract symptom (LUTS) diagnosis throughurophonography signal as a noninvasive method. The hardware and software which could evaluate the function ofurophonography signal during urination. The PSD (power spectrum density) and the log-log plot gradient analysis wereacomplished in frequency domain. For evaluation of the system and analysis method, a model system for the lowerurinary system of men was used. From the evaluation of the model system, the PDS and the log-log plot gradient weredependent on the occlusion degree significantly. In a pilot study on normal and abnormal male subjects, the PSD andthe log-log plot gradient were highly correlated with the artificial urethral obstruction.

배뇨력 측정을 통한 하부요로계의 보상성기능항진 평가

정도운,전계록 한국센서학회 2006 센서학회지 Vol.15 No.6

The purpose of urodynamic investigation is to obtain the information on the function of the urinary system. The aim of this study is to acquire the useful information of lower urinary tract symptom (LUTS) diagnosis through void force signal as noninvasive method. The system which could evaluate the function of compensatory hypertrophy with noninvasive and comfortable method was implemented to measure uroflow and void force during urination. The implemented system composes of the sensor parts, signal conditioning parts and PC monitoring program. For the evaluation of the implemented system, the simulation of control part of the system was performed and the model system for the lower urinary system was designed. The superiority of a measuring characteristic of the implemented system was verified using the model system. From the evaluation of the model system, we have found out that the void force was dependent on the occlusion degree and compensatory hypertrophy significantly.

하부요로계 페색 진단용 요류음 계측 시스템의 구현 및 평가

정도운,조성택,전계록 한국센서학회 2005 센서학회지 Vol.14 No.2

A sensor and measuring system were implemented to measure both uroflow and urophonography signal during urination for diagnose the lower urinary tract symptom. The implemented system was composed of the uroflow sensor using the load-cell, the urophonography measurement sensor so as stethoscope type, pre-processing part for sensors signal detection, amplifier and filter, system control parts and PC measurement program. A simulator of the lower urinary system that is experimental equipment implemented for evaluate the developed system. The two signals were measured using implemented system and analyzed these signal by means of time domain and frequency domain for extraction of the characteristic parameter which can most effectively reflected by the occlusion of the lower urinary system. Furthermore two signals were measured and analyzed with the subject of 5 healthy adult for clinical application possibility of the implemented system. As a result, the most influence bandwidth of effect according to occlusion of the lower urinary system is 253 ~ 282 Hz of the urophonography signal.

휴대형 혈액가스분석 시스템의 구현 및 성능평가

정도운,전계록,배진우,김길중,심윤보 한국센서학회 2003 센서학회지 Vol.12 No.1

In this study, we implemented the measurement of pH, pO2, pCO2 of the arterial blood on a portable blood gas analysis system. This system is consist of two parts of hardware and software. The hardware part is divided into a fluidic mechanism and an electronic circuit unit. The system program is composed of operating, washing, correcting, and measuring routines. Both of 1-point and 2-point calibration schemes were used to enhance the accuracy of the measurement. In order to evaluate the performance of the developed system, we measured and performed statistical analysis on the characteristics of the sensing electrode response. As a result, coefficient variation was within 1.12, and maximum error was within 1.298%. We confirmed development possibility of portable blood gas analyzer. 본 연구에서는 동맥혈액 내의 혈액가스(pH, pCO2, pO2)를 측정할 수 있는 휴대용 혈액가스 분석 시스템을 구현하였다. 구현된 시스템은 크게 하드웨어부와 소프트웨어부로 구분하였으며, 하드웨어부는 메커니즘과 전자회로부로 구분하여 설계하였다. 소프트웨어부는 각 모듈별로 작성하였으며, 운용프로그램, 세척프로그램, 교정프로그램, 측정프로그램 등으로 구성하였다. 그리고 시스템의 정확한 교정을 위하여 2점 교정방식을 사용하였고, 1점 보정방식을 추가 적용하여 측정의 정확성을 높이고자 하였다. 시스템의 평가를 위하여 각 전극의 감응특성을 조사하였다. 그리고 정확도 평가를 위하여 표준용액을 이용하여 측정실험을 하고 통계적인 분석을 하였다. 그 결과 계수변화율이 1.12이내이었고, 최대오차가 1.298 %이내인 정확도를 나타내었으며, 휴대형 ABGA의 개발 가능성을 확인하였다.

Wiener Filtering 기법을 적용한 홈헬스케어용 심전도 신호 모니터링 시스템 구현

정도운,김세진,Jeong, Do-Un,Kim, Se-Jin 한국융합신호처리학회 2008 융합신호처리학회 논문지 (JISPS) Vol.9 No.2

The ECG is biomedical electrical signal occurring on the surface of the body due to the contraction and relaxation of the heart. This signal represents an extremely important measure for health monitoring, as it provides vital information about a patient's cardiac condition and general health. ECG signals are contaminated with high frequency noise such as power line interference, muscle artifact and low frequency nose such as motion artifact. But it is difficult to filter nose from ECG signal, and errors resulting from filtering can distort a ECG signal. The present study implemented a small-size and low-power ECG measurement system that can remove motion artifact for convenient health monitoring during daily life. The implemented ECG monitoring system consists of ECG amplifier, a low power microprocessor, bluetooth module and monitoring program. Amplifier was designed and implemented using low power instrumentation amplifier, and microprocessor was interfaced to the ECG amplifier to collect the data, process, store and feed to a transmitter. And bluetooth module used to wirelessly transmit and receive the vital sign data from the microprocessor to an PC at the receiving site. In order to evaluate the performance of the implemented system, we assessed motion artifact rejection performance in each situation with artificially set condition using adaptive filter.

FPGA를 이용한 LUTS 진단 시스템 구현 및 평가

정도운,정완영,전계록,Jeong, Do-Un,Chung, Wan-Young,Jeon, Gye-Rock 한국융합신호처리학회 2007 융합신호처리학회 논문지 (JISPS) Vol.8 No.1

The purpose of urodynamic investigation is to determine information on the function of the urinary system. One of the most frequently used measurement procedures in urodynamics is filling and voiding cystometry using invasive method. But in this method transurethral catheter is use and it makes patients uncomfortable. The aim of this study was to implement the system that could evaluate the function of urinary tract with noninvasive and comfortable method. Therefor in this study, a sensor and measuring system were implemented to measure uroflow, urophonography and noninvasive bladder pressure signal during urination for diagnosing the LUTS(lower urinary tract symptoms) using noninvasive method. The implemented system compose of the sensor parts, signal conditioning parts, system control parts using FPGA and PC monitoring program. For the evaluation of the implemented system, the simulation of system's control part was performed and the model system for the lower urinary system was designed. From the evaluation of the model system, the mean error rate of the uroflow measurement part was 1.08% and coefficient of variation was 1,48. And the mean error rate of the noninvasive bladder pressure measurement part was 2.41% and coefficient of variation was 2.81. urophongraphy signal analysis was accomplished in a time domain and frequency domain. Average RMS power was used in a time domain analysis, and MF was used in a frequency domain analysis. From the evaluation of the model system average RMS power and MF was dependent on the occlusion degree significantly and median frequency range of $60{\sim}160Hz$ was correlated with the occlusion.

LUTS진단을 위한 요류음의 PSD분석

정도운,전계록 제어로봇시스템학회 2007 제어로봇시스템학회 국내학술대회 논문집 Vol.2007 No.5

하부요로계 폐색 진단용 요류음 계측 시스템의 구현 및 평가

정도운,조성택,전계록,Jeong, Do-Un,Cho, Seong-Taek,Jeon, Gye-Rok 한국센서학회 2005 센서학회지 Vol.14 No.1

A sensor and measuring system were implemented to measure both uroflow and urophonography signal during urination for diagnose the lower urinary tract symptom. The implemented system was composed of the uroflow sensor using the load-cell, the urophonography measurement sensor so as stethoscope type, pre-processing part for sensors signal detection, amplifier and filter, system control parts and PC measurement program. A simulator of the lower urinary system that is experimental equipment implemented for evaluate the developed system. The two signals were measured using implemented system and analyzed these signal by means of time domain and frequency domain for extraction of the characteristic parameter which can most effectively reflected by the occlusion of the lower urinary system. Furthermore two signals were measured and analyzed with the subject of 5 healthy adult for clinical application possibility of the implemented system. As a result, the most influence bandwidth of effect according to occlusion of the lower urinary system is $253{\sim}282$ Hz of the urophonography signal.