http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
민병구,김희찬,김성덕,송현철,최덕환,김광우,장호조,원영천 대한마취과학회 1982 Korean Journal of Anesthesiology Vol.15 No.4
By virtue of the development of monitoring system and increasing tendency of critically iN patients, We have performed canautation of radial artery after Allen's test for the continuous monitoring of arterial pressure. It is very important to measure blood pressure accurated, as it gives as many information in the poor risk patients. During monitoring of blood pressure for several years, we have had much troubles because of damping of arterial pressure waves due to air bubbles. In this study, we used P_25 Db pressure tranducer and Spacelab Alpha System for monitoring of blood-pressure, following cannulation of radial artery. Air bubbles of 0.5 ml, 1.0 ml, 1.5 ml and 2.0 ml were inserted into monitoring system, i.e. fluid-filled catheter respectively. The statistical analysis by paired student T-test showed following results. 1) Systelic blood pressure were decreased significantly from 110±14.4 torr of control group to 105±15.9 torr, 102±16.1 torr, 99±16.2 torr and 99±15.2 torr in 0.5 ml, 1.0 ml, 1.5 ml and 2.0 ml air groups respectively. 2) Diastolic blood pressure were increased from 70±12.4 torr of control group to 72±13.8 torr, 76±13.9 torr, 78±14.3 torr and 81±13.1 torr in each cases respectively. 3) Pulse pressure were decreased from 40±13.3 torr of control group to 33±15.4 torr, 26±13.6 torr, 22±13.0 torr and 18±12.0 torr in each cases respectively. 4) But mean arterial pressure showed no significant changes except in 2.0 ml air group, where showed slight change.
민병구,박광석 대한의용생체공학회 1986 의공학회지 Vol.7 No.1
A digital X-ray system was developed using photo-diode arrays. Images were collected with 1,024x1,024x10 bit resolution and 0.5 sec acquisition time. An4 collected images were processed and restored using computer algorithms. For the normal and the patient, we obtained the digital X-ray images using the developed system.
민병구,홍현기,남기창,차은종,김덕원 대한전자공학회 2007 電子工學會論文誌-SC (System and control) Vol.44 No.1
AABR(automated auditory brainstem response) test is used for the screening purpose of hearing ability of neonates. In this paper, algorithm using Rolle's theorem is suggested for automatic detection of the ensemble averaged ABR waveform. The ABR waveforms were recorded from 55 normal-hearing ears of neonates at screening levels varying from 30 to 60 dBnHL. Recorded signals were analyzed by expert audiologist and by the proposed algorithm. The results showed that the proposed algorithm correctly identified latencies of the major ABR waves (III, V) with latent difference below 0.2 ms. No significant differences were found between the two methods. We also analyzed the ABR signals using derivative algorithm and compared the results with proposed algorithm. The number of detected candidate waves using the proposed algorithm was 47 % less than that of the existing one. The proposed method had lower relative errors (0.01 % error at 60dBnHL) compared to the existing one. By using proposed algorithm, clinicians can detect and label waves III and V more objectively and quantitatively than the manual detection method. 자동화 청성뇌간반응검사(automated auditory brainstem response; AABR)는 ABR 파형을 자동으로 검출하여 신생아의 청각선별검사에 사용되고 있다. 본 논문은 앙상블 평균된 ABR 파형에 대해서 롤의 정리를 이용한 새로운 자동화 ABR 파형 검출 알고리즘을 제안하였다. 정상 청력을 가진 신생아의 55개의 귀를 대상으로 30, 40, 50, 60 dBnHL의 다양한 강도를 가진 클릭 자극음에 대한 청성뇌간반응 파형을 측정하였다. 수동 검출법(manual detection method)과 제안된 자동 검출법을 이용하여 파형 III 과 V의 평균 잠복기(average latency time) 차를 분석하였는데, 동일한 파형(잠복기 차 < 0.2 ms)으로 관측되어 두 방법 간에는 유의한 차이가 없었다. 또한 미분 자동 검출법(automated detection method using derivative estimation)과 제안된 자동 검출법을 파형 III과 V로 판명될 후보 파형의 개수에 대해 비교하였다. 미분 자동 검출법에 비해 제안한 자동 검출법에서 후보 파형의 개수가 47 % 감소되어 검출되었다. 또한 수동 검출법에 대한 제안된 자동 검출법의 잠복기 오차율은 미분 자동 검출법에 비해 60 dBnHL의 자극강도에서 낮은 잠복기 오차율(<0.01 %)을 보였다. 따라서 제안된 알고리즘으로 청각전문가가 기존의 수동 검출 방법보다 객관적이고 정량적으로 파형 III과 V를 검출하고 표시할 수 있게 된 데에 의의가 있다.
민병구,김영호,고창순,Min, Byeong-Gu,Kim, Yeong-Ho,Go, Chang-Sun 대한의용생체공학회 1984 의공학회지 Vol.5 No.2
In the present study, we developed a nuclear stethoscope interfaced with a personal computer (APPLE- II) and evaluated it's performances as compared with the gamma camera. This single-probe, ECG-gated system has been used for displaying the left ventricular time-activity curves, the peak ejection time and its rate, the peak filling time and its rate, and the R-R interval distribution. The radioactivity was measured at every 10msec around the ventricular region, where the activity curves shows the maximal peak to peak variations. The background activity was measured around the lung area showing its counts approximately 50% of the end-diastolic count with minimal variations. The average time-activity curves of 100 beats were used for analysis in the equilibrium study after intravenous injection of 15-20mCi of Tc. The ejection fractions measured by the nuclear stethoscope(Y) were compared with those measured by gamma camera(X) in 47 patients with various heart diseases. The correlation coefficient between two measurements was 0.766 with a relation of Y=1.04 x-8.48. Also, the high reproducibility was obtained for the same patient. Also, the high reproducibility was obtained for the same patient. From this study, we conclude that this device is useful for continuous monitoring in the intensive care unit, as it is portable, compact, and inexpensive.
민병구 대한의용생체공학회 1989 의공학회지 Vol.10 No.2
Two-Dimensional modelling of the Cochlear biomechanics is presented in this paper. The Laplace partial differential equation which represents the fluid mechanics of the Cochlea has been transformed into two-dimensional electrical transmission line. The procedure of this transformation is explained in detail. The comparison between one and two dimensional models is also presented. This electrical modelling of the basilar membrane (BM) is clearly useful for the next approach to the further. Development of active elements which are essential in the producing of the sharp tuning of the BM. This paper shows that two-dimension model is qualitatively better than one-dimensional model both in amplitude and phase responses of the BM displacement. The present model is only for frequency response. However because the model is electrical, the two-dimensional transmission line model can be extended to time response without any difficult.