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멀티미디어 기법을 이용한 의학교육자료의 제작 및 재생 시스템
차은종(Eun Jong Cha),이태수(Tae Soo Lee),황영일(Young Il Hwang),구용숙(Yong Sook Goo),이현무(Hyun Moo Lee),김원재(Wun Jae Kim) 한국의학교육학회 1994 Korean journal of medical education Vol.6 No.1
Medical education and research require various forms of information, which form multimedia data. While traditional computer can only deal with numeric and coded data, modern computer technology enabl es intergrated management of multimedia data. The present system was designed to perform convenient, acquisition, processing and analysis, and efficient presentation of medical multimedia data. APC-486 DX2 system epuipped with 8MB DRAM and 250 MB HDD provided fast enough computation speed, and image quality guaranteed by 17-inch SVGA color monitor. Both sound and image data are simultaneously acquired through a condenser microphone and audiocard, and respectively, in a video signal format. Printed pictures are digitized by a color scanner. Data transmission is also possible through a local area network (LAN). Acquired media data are structured in a hierarchy with the image data as apex. A variety of image processing and analysis algorithms were implemented and the media data can be reproduced simultaneously. Furthermore, simple and dynamic image animation can be performed to enhance data editing and authoring capability. Selected data sets can be reproduced in a user defined sequence, enabling multimedia slide presentation . User interface was made in Windows format and all application programs were written in Borland C++ for future flexibility and extension. The present system will be of convenient use to acquire, manage, and present multimedia data for medical education and research.
차은종(Eun-Jong Cha),이인광(In-Kwang Lee),이유미(You-Mi Lee),한순화(Soon-Wha Han),한정수(Jeong-Su Han),서재원(Jae-Won Suh),박찬식(Chan-Sik Park),김경아(Kyung-Ah Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.9
Medical system for personal health management recently changes its paradigm from hospital service to self home care based on ubiquitous technology for healthcare anywhere at any time. The present study developed a wireless bio-signal measurement system for patients to self manage pulmonary disease and benign prostate hyperplasia(BPH), both of which are chronic diseases with increasing frequency in modern society. Velocity-type respiratory air flow transducer adapted to develop respiratory module for pulmonary disease management was simplified in structure to measure uni-directional flow since most important diagnostic parameters are evaluated on the expiratory flow signal only. Standard weight measurement technique was introduced to obtain urinary flow signal for BPH management. Three load cell signals were acquired for averaging to minimize noise, followed by accuracy evaluation. Transmission and receiver modules were also developed with user program for wireless communication. Averaged relative errors were 2.05 and 1.02% for respiratory volume and maximal flow rate, respectively, and the relative error was 2.17% for urinary volume, demonstrating that both modules enabled very accurate measurements. Wireless communication distance was verified within 15m, long enough for home care application. The present system allows the user to select a necessary measurement module on a particular health demand and to immediately provide the self-test results, thus better quality health care would be possible.
차은종(Cha, Eun-Jong),이인광(Lee, In-Kwang),장종찬(Jang, Jong-Chan),김성식(Kim, Sung-Shick),이수옥(Lee, Su-Ok),정재관(Jung, Jae-Kwan),박경순(Park, Kyung-Soon),김경아(Kim, Kyung-Ah) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.5
노력성 폐활량(FVC) 검사시 호식기류의 최대값인 최고호기유량(PEF)은 호흡기능의 평가에 매우 중요하게 활용되는 진단 매개변수이다. PEF는 검사 초기에 매우 짧은 순간에 크게 증가하는 양상을 띠기 때문에 호흡기류센서의 동특성이 충분하지 않은 경우 측정오차가 발생한다. 본 연구에서는 노력성 호식기류 상의 초기 상승속도 (Sr)를 산출하고 Sr 값에 기초하여 센서 출력값을 보정하는 새로운 기법을 제안하였다. 미국 흉부학회(ATS)에서 제공하는 표준 기류신호 파형 26개를 생성하여(F) 속도계측형 호흡기류센서로 통과시키며 센서 출력신호(N)를 축적하였다. F의 최대값인 PEF와 N의 최대 값인 NPEF 간에는 당초 예상했던 대로 2차함수 관계가 성립하였으나(상관계수 0.9997), ATS파형 #2 및 26은 상당한 이탈을 보였다(상대오차>10%). NPEF의 상대오차와 Sr 간의 관계를 분석하여 상호 선형적인 관계를 얻었으므로, 이를 이용하여 보정한 결과 PEF 상대오차의 99% 신뢰구간이 약 2.5% 이었다. 이는 국제 표준인 ATS의 오차한계인 10%의 1/4 이내로써 매우 정확한 보정이 이루어졌다. 따라서 본 연구에서 제안하는 보정기법은 호흡기류센서 교정시 매우 유용하리라 판단된다. Peak expiratory flow rate(PEF) is a very important diagnostic parameter obtained from the forced vital capacity(FVC) test. The expiratory flow rate increases during the short initial time period and may cause measurement error in PEF particularly due to non-ideal dynamic characteristic of the transducer. The present study evaluated the initial rise slope(Sr) on the flow rate signal to compensate the transducer output data. The 26 standard signals recommended by the American Thoracic Society(ATS) were generated and flown through the velocity-type respiratory air flow transducer with simultaneously acquiring the transducer output signal. Most PEF and the corresponding output(NPEF) were well fitted into a quadratic equation with a high enough correlation coefficient of 0.9997. But only two(ATS#2 and 26) signals resulted significant deviation of NPEF with relative errors>10%. The relationship between the relative error in NPEF and Sr was found to be linear, based on which NPEF data were compensated. As a result, the 99% confidence interval of PEF error was turned out to be approximately 2.5%, which was less than a quarter of the upper limit of 10% recommended by ATS. Therefore, the present compensation technique was proved to be very accurate, complying the international standards of ATS, which would be useful to calibrate respiratory air flow transducers.
차은종(Eun-Jong Cha),최성수(Seong-Su Choi),이인광(In-Kwang Lee),김도경(Do-Kyung Kim),한순화(Soon-Wha Han),김경아(Kyung-Ah Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.12
Benign prostatic hyperplasia (BPH) significantly deteriorates the quality of life in aged men. Uroflowmetry is a convenient non-invasive clinical test to diagnose BPH. However, the test is usually performed in the presence of a technician, which may affect the way of urination for the lack of privacy. The present study developed a wireless uroflowmeter to provide the best privacy with a user program on PC evaluating the diagnostic parameters. Pilot experiment was followed to test clinical applicability.
속도계측형 호흡기류센서에서 상승시간을 고려한 최고호기유량의 교정 기법
차은종(Eun-Jong Cha),이인광(In-Kwang Lee),김성식(Seong-Sik Kim),김완석(Wan-Suk Kim),박경순(Kyung-Soon Park),김원재(Wun-Jae Kim),김경아(Kyung-Ah Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.4
Peak expiratory flow rate(PEF) is one of the most important diagnostic parameters in spirometry. PEF occurs in a very short duration during the forced expiratory maneuver, which could lead to measurement error due to non-ideal dynamic characteristic of the transducer. In such case the initial slope of the flow rate signal determines the accuracy of the measured PEF. The present study considered this initial slope as a parameter to compensate PEF. The 26 standard flow rate signals recommended by the American Thoracic Society(ATS) were flown through the air flow transducer followed by simultaneous measurements of PEF and maximum transducer output(NPEF). NPEF-PEF satisfied a quadratic equation in general, however, two signals(ATS #2 and #26) having large initial slopes deviated from the fitting equation to a significant degree. The relative error was found to be in a linear relationship with the initial slope, thus, NPEF was appropriately compensated to provide accurate PEF with mean relative error less than only 1%. The 99% confidence interval of the mean relative error was less than a half of the error limit of 5% recommended by ATS. Therefore, PEF can be very accurately determined by compensating the transducer output based on the initial slope, which should be a useful technique for air flow transducer calibration.
최은선(Eun-Seon Choi),Kong, Vungsovanreach,손호선(Ho Sun Shon),차은종(Eun-Jong Cha),조완섭(Wan-Sup Cho),김경아(Kyung-Ah Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
치주질환은 초기의 동통과 자각증상이 없는 관계로 조기발견이 어려운 질병이다. 그러나 건강보험심사평가원의 통계에 의하면 외래 다 빈도 상병 통계환자 1위를 차지하고 있으며 다양한 연구에서 전신질환과의 연관성이 보고되고 있다. 최근 보건의료 빅데이터 개방 시스템의 구축으로 인해 치주질환에 대한 대규모 데이터에 대한 분석도 이루어지고 있다. 따라서 본 연구에서는 국민건강영양조사 6기 중 제 1차년도 자료를 사용하여 치주질환의 유무에 따른 요인을 분석하기 위해 특징선택 후 분류 모델을 통해 성능을 평가하였다. 이러한 결과는 향후 치주질환 뿐만 아니라 의료데이터 분석을 위한 기반 자료로 사용될 수 있을 것이다.
휴대형 심전도 모니터링 장치에서의 2가지 호흡 검출 알고리즘
김종명(Jong-Myoung Kim),홍주현(Joo-Hyun Hong),김남진(Nam-Jin Kim),차은종(Eun-Joung Cha),이태수(Tae-Soo Lee) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
In this study, two algorithms for detecting respiratory rate from portable ECG device were presented. The first algorithms counts the number of ECG samples between R-R peaks, which varies according to respiratory states of patients, such as, exhalation and inhalation. The second algorithms detects the rate by measuring the size of R wave, which also varies according to the respiratory status of patient. These two algorithms were programmed to the laboratory developed ECG device and their usefulness was verified in laboratory environment.