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김택수,허재만 대한의용생체공학회 1992 의공학회지 Vol.13 No.2
Background EEG signals can be represented as the sum of a conventional AR process and an innovation process. It Is know that conventional estimation techniques, such as least square estimates (LSE) or Gaussian maximum likelihood estimates (MLE-G ) are optimal when the innovation process satisfies the Gaussian or presumed distribution. When the data are contaminated by outliers, however, these assumptions are not met and the power spectrum estimated by conventional estimation techniques may be fatally biased. EEG signal may be affected by artifacts, which are outliers in the statistical term. So the robust filtering estimation technique is used against those artifacts and it performs well for the contaminated EEG signal.
Microprocessor를 이용한 Patient Monitor 개발(Ⅱ)
김남현,김정래,허재만 대한의용생체공학회 1995 의공학회지 Vol.16 No.1
In this paper, the patient monitor consisting of ECG/Respiration Amplification. Front end CPU. Main CPU, Main Controller. Video Amplifier, Display Controller, Waveform Generator. Bus & Power Supply, 8097 Processor was developed. This patient monitor measures the patient's states in the hospital such as elecctro-cardiography, respiration, blood pressure and temperature. The control and processing methods based on micro-processor employ the flexibility, extensibility over other conventional system. The followings are incorporated in this system. First, ECG/RESP measures the respiration by impedence pneumography. Second, FECPU utilizes an Intel 8031 microcontroller. Third, Controller function originate from a LSI CRT controller.
김남현,김원기,허재만,김정래,장병철 대한의용생체공학회 1993 의공학회지 Vol.14 No.4
Automatic transmission of data from the blood analyzer to the request site is one of the most important part in hospital computerization. We have developed a system that transmits data from the arterial blood gas analyzer to the request site automatically. In this system HOST computer, FILE server, LAN(Local Area Network), 3270 Emulator and Multi-port card are integrated w1th 3 blood gas analyzers(NOVA Inc., USA) which are connected to a single multi-port card in a personal computer. When specimen are collected from sampling sites, they are transfered to the laboratory in the Yonsei Cardiovascular Center. After analysis, the result is transmitted to the personal computer via serial communication between machine and multi-port card using interrupt method. Then, the patient's information (Name. Patient ID No., etc.) is obtained from the HOST computer througth the emulator. The combined data(patient information & lab data) is transmitted to each request site via LAN automatically. These results are stored in the File Server for one year and they can be reviewed anytime. Also, it could be used for the various statistics and the flow chart for clinical research. Additionally, we found that this system reduces the personal labor.
김원기,김남현,허재만,Kim, Won-Gi,Kim, Nam-Hyeon,Huh, Jae-Man 대한의용생체공학회 1990 의공학회지 Vol.11 No.2
A workstation for archiving and communication of medical records is developed for clinical use in hospital. In this system, handwritten diagnostic reports, medical recording papers such as ECG and EEG etc., and ultrasound images are stored in optical disks instead of papers. This system improves medical service owing to speedy diagnosis by fast finding the patient's medical chart, and curtails the cost of archiving medical charts economically. If this system can be combined with already developed MPACS, then integrated medical image di- agnosis will be possible.