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.

가정용 무선 호흡기류 및 요속신호 계측 시스템 개발

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.

전자제어 밸브용 통합 개발 장치 설계 및 구현

차은종(CHA Eun Jong),김태호(KIM Tae Ho),박찬식(PARK Chansik) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.1

노력성 폐활량검사시 호흡기류센서의 보정기법

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.

무선 요속계 시스템 구현

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.

한국연구재단과 한국환경산업기술원 간 Eco-Bridge 구축방안에 관한 연구

이종현(Jong Hyun Lee),권상숙(Sang Sook Kwon),정동일(Dong Il Jung),손지호(Ji Ho Son),차은종(Eun Jong Cha),여무송(Moo Song Yeu),이성종(Sung Jong Lee),박귀순(Kwi Sun Park) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.8

국가연구개발 투자가 선진국 수준으로 증가함에 따라 투자 대비 성과 제고를 위해, 부처별 역할과 기능에 따라 상이한 소속부처(연구개발지원기관)간 협업의 필요성이 점차 부각되고 있다. 올해 출범한 신정부에서도 부처간 칸막이를 제거하고, 협업을 통한 국가연구개발사업 투자의 효율성 극대화를 정책목표로 제시하였다. 본 연구에서는 한국연구재단과 한국환경산 업기술원 간 우수한 연구성과의 선순환적 활용을 위한 협력사업 추진과 Eco-Bridge 구축 방안을 제시하였다. 양 기관은 2012년 환경융합분야 관련 연구개발사업의 성과제고를 골자로 하는 양해각서(MOU)를 체결하였다. 이후 미래창조과학부와 환경부 간 기초연구성과의 실용화를 위해 한국연구재단 지원으로 기 수행된 기초연구과제를 대상으로 한국환경산업기술원에서 응용연구과제를 공모하는 방식의 협력체제를 국내 최초로 구축하고 환경부 공모 ``2013년 환경융합신기술개발사업``으로 향후 3년 동안 약 20억원을 지원하게 된다. 또한 부처간 상설 협의기구인 ``환경융합 Bridge 협의회`` 설립 및 기초 R&D분야 연구자와 산업체 수요자를 상호 연계하는 Matching Program을 추진할 계획이다. 이와 같은 양 기관 협력체제는 기초 R&D가 시장 예측및 수요를 기반으로 하는 R&BD의 형태로 발전하는 새로운 모델을 제시하고 나아가 부처별 연구지원 특성을 반영한 범부처협력체계의 구축으로 국가연구개발사업의 효율성을 제고할 것으로 기대된다. Korea is one of the top countries that has funded great amount to promote basic research and others in recent decade. While the quantity of R&D fund in Korea has rapidly increased, the effectiveness and quality of R&D outcomes became a controversial issue. National Research Foundation of Korea (NRF) and Korea Environmental Industry & Technology Institute (KEITI) agreed to collaborate for diffusing and utilizing R&D outcomes of each institute. NSF and KEITI signed the bilateral MOU in 2012, and Interministerial Collaborative R&D Support Framework (ICR&DSF) was developed. The ICR&DSF consist of launching an Eco-Bridge Program as an interministerial R&D program and composition of Environmental Convergence R&D Bridge Committee. The Eco-Bridge Program was applied to ``Environmental Convergence Technology Project`` of KEITI as a pilot program in 2012. The unique feature of this interministerial R&D program is that the Eco-Bridge Program directly supports the basic research outcomes which are previously funded by NRF. As the collaboration between NRF and KEITI becomes stronger, it is expected to explore the more creative and the more transformative research.

로지스틱회귀를 이용한 치주질환 유병 관련 요인 분석

최은선(Eun-Seon Choi),Kong, Vungsovanreach,손호선(Ho Sun Shon),차은종(Eun-Jong Cha),조완섭(Wan-Sup Cho),김경아(Kyung-Ah Kim) 대한전기학회 2021 정보 및 제어 심포지엄 논문집 Vol.2021 No.10

CDMA망 기반 3채널 심전도 모니터링 시스템의 평가

홍주현,차은종,이태수,Hong, Joo-Hyun,Cha, Eun-Jong,Lee, Tae-Soo 대한의용생체공학회 2008 의공학회지 Vol.29 No.4

A wireless 3 channel ECG monitoring system was developed so that it could monitor the health and movement state during subject's daily life. The developed system consists of a wireless biomedical signal acquisition device, a personal healthcare server, and a remote medical server. Three experiments were performed to evaluate the accuracy, reliability and operability, applicability during daily life of the developed device. First, ECG signals were measured using the developed device and commercial reference device during sitting and marking time and compared to verify the accuracy of R-R intervals. Second, the reliable data transmission to remote server was verified on two types of simulated emergency event using patient simulator. Third, during five types of motion in daily life, the accuracy of data transmission to remote server using CDMA network was verified on two types of event occurring. By acquiring and comparing subject's biomedical signal and motion signal, the accuracy, reliability and operability, applicability during daily life of the developed device were verified. In addition, PDA-phone based wireless system enabled subject to be monitored without any constraints. Therefore, the developed system is expected to be applicable for monitoring the aged and chronic diseased people and giving first-aid in emergency.

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.