• Proceedings of the KOSOMBE Conference
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• v.1985 no.06
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• pp.20-21
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• 1985

본 연구에서는 다중채널의 방대한 생체 신호 정보량을 전화회선을 이용하여, 효율적으로 전송하기 위한 생체 신호 데이터 전송 시스템을 설계한다. 특히 생체 신호 데이터를 신속하게 전송하기 위하여 가변어장 data frame을 사용하였고, 생체 신호 전처리 unit와의 interface 등을 검토하였다.

• Proceedings of the KOSOMBE Conference
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• v.1992 no.05
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• pp.209-212
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• 1992

A major technical problem in encountered in nerve stimulation technique is the control of stimulus artifact and the convenience of nerve stimulator. The artifacts remained must be removed by processing the contaminated signal. This paper discusses about the artifact cancellation algorithms in constant voltage type nerve stimulator(CVS) and constant current type nerve stimulator(CCS).

• Proceedings of the KOSOMBE Conference
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• v.1997 no.05
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• pp.484-488
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• 1997

In this Paper, We use Maximum-Intensity Projection(MIP) algorithms. Maximum-Intensity Projection algorithms currently used for construction of magnetic resonance angiograms. The blood flow in a volume of interest is represented by bright intensities in the MR data volume. The flow within the vasculature shows up in the projections plane. By relating the intensities of the pixel to their location in the slice, the total number of pixels considered for the projection plane was reduced, thus saving calculation time. The algorithm was written in visual C++.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.05
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• pp.131-135
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• 1997

We implementated an ultrasonic wave cane for the blind. The cane detect walking obstacle and provide a walking direction. The cane used time of flight method of ultrasonic-wave for a measurement of obstacle distance and fluxgate geomagnetic sensor for guidance of walking direction. This system can detect an obstacle of upward, forward, downward and that warn to the blind with vibration, pitch sound. And the blind can know walking direction to voice output. As a result, the blind could efficiently avoid a exposed obstacle, obstacles beyond knee, an exposed street obstacle, a branch of tree person's height and it is usable search for surrounding land mark.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.569-572
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• 1998

In this paper, we devised pulse rate diagnosis for provide basic index of cold-hot diagnosis. The system consist of database part and pulse rate detection part for detection pulse wave, respiration and ECG. The database is constructed windwos95 platform using DAO(data access object). Search algorithm used ISAM algorithm. The database consist of one's information and medical report for a subject and detected pulse wave.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.2
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• pp.156-160
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• 2014

Thresholding in frequency domain is a simple and effective noise reduction technique. Determination of the threshold is critical to the image quality. The optimal threshold minimizing the Mean Square Error (MSE) is chosen adaptively in the wavelet domain; we utilize an equation of the MSE for the soft-thresholded signal and the histogram of wavelet coefficients of the original image and noisy image. The histogram of the original signal is estimated through the deconvolution assuming that the probability density functions (pdfs) of the original signal and the noise are statistically independent. The proposed method is quite general in that it does not assume any prior for the source pdf.

• Proceedings of the KOSOMBE Conference
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• v.1991 no.11
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• pp.34-36
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• 1991

본 논문에서는 저주파의 envelope와 고주파의 neural oscillation 신호의 곱으로 이루어진 EEG 신호의 envelope를 추출을 하기 위하여 multiplicative homomorphic 시스템을 사용하였다. 이 방법은 다른 방법에 비하여 처리 과정이 간단하여 계산량이 감소되어 실시간 envelope 추출의 가능성을 보였으며, 또 neural oscillation signal의 주파수가 변하여도 정확한 envelope 추출할 수 있는 우수한 적응력을 보였다.

• Proceedings of the KOSOMBE Conference
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• v.1989 no.05
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• pp.77-80
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• 1989

This paper describes a study on the locomotion control system for a indoor-use mobile wheelchair. Three lode of operations - BASIC, AUTOMATIC and PROGRAMMED - are employed as basic algorithm building block. One-chip microcomputer 8031 is dominating the control of actuation part and it can control the range of rotating speed of the wheel both right and left by servo motor. Keyboard is employed as a command input device. This system is intended to improve the daily life of the disabled by the intelligent interactive operation scheme.

• Proceedings of the KOSOMBE Conference
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• v.1992 no.11
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• pp.89-92
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• 1992

The sensory nerve study is the important index to diagnosis peripheral neuromyotic disease. This paper discusses about the design of parameter - latency, amplitude, conduction velocity - measurement system in the sensory nerve. This system consists of three parts which are Main Control Unit(MCU), Stimulator, and external output unit. Also new measurement algorithms which is adaptive threshold method is presented in this paper. The designed system is controlled by MCU includes automatic detection algorithms and self-diagnostic functions.

• Proceedings of the KOSOMBE Conference
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• v.1993 no.05
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• pp.116-119
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• 1993

In this paper, we implemented a pulse wave type oximeter system that continuously measure the of oxyhemoglobin saturation of the arterial blood(SaO2) and pulse rate with non-invasively. We use the transmission type and reflection type transducer for comparison the percentage of hemoglobin oxgen saturation. The light Iron the two kind of LEDs is transmitted through the tissue, then received by a single photodiode with alternatively. By the phase sensitive detection circuit, the output of the photodiode is separated in to red and near infrared signal. We calculated a ratio of light transmittance between two kind of LEDs, and then, it is applied to the oxgen saturation coefficent calculation formular.