Biomedical subjects

Kyeong-Seop Kim

Publications and source records attributed to Kyeong-Seop Kim.

3 recordsLinked to original sources

PubMed2003

Thermo-visual evaluation of the Yin-Tang acupuncture point for intracranial hypertension syndrome.

This study describes a thermo-visual method to diagnose intracranial hypertension syndrome that is caused by a high intracranial pressure by observing the relative temperature distribution around the "Yin-Tang" acupuncture point. Based on thermo-visual analysis of 3000 thermal images scanned by infrared thermal imaging system acquired from 1256 admitted patients, we found that a certain specific temperature distribution around the Yin-Tang acupuncture point was related with the degree of severity of intracranial hypertension syndrome. Thus, we claim that the evaluation of the relative temperature distribution around the Yin-Tang acupuncture point can be used to diagnose and control intracranial hypertension syndrome during medical treatments.

Acupuncture Points↗

PubMed2002

A novel design of thermal anomaly for mammary gland tumor phantom for microwave radiometer.

Microwave radiometry is the spectral measurement technique of resolving electromagnetic radiation of all matters which temperature is above absolute zero. This technique utilizes the electromagnetic noise field generated by a thermal volume similar to a mechanism existing in biological tissues. One particular application of microwave radiometry is for analyzing temperature differentials of inside of human body to detect and diagnose some crucial pathological conditions. For the general evaluation of a microwave radiometer, we propose a new type of phantom containing a mammary gland tumor imitator by considering biological heat diffusion effects propagated by a real tumor. Theoretical researches of human tumor revealed the fact that temperature distribution of tissues around a tumor formed a Gaussian statistics. To comply with the physiological property of the real tumor, we built a mammary gland tumor imitator composed of two parts (pseudotumor and thermal anomaly) and observed its temperature distribution when it was placed inside a phantom. Our results showed that the thermal properties of tumor imitator well agreed with heat-transfer properties of a real tumor and the proportional linear relationship existed between the location of tumor imitator and the intensity of radiometer measurements. From this relationship, we could also estimate several parameters related with our phantom, such as the minimum detectable size and maximum detectable depth of a tumor imitator.

Hot Temperature↗

PubMed2002

A real time QRS detection using delay-coordinate mapping for the microcontroller implementation.

In this article, we propose a new algorithm using the characteristics of reconstructed phase portraits by delay-coordinate mapping utilizing lag rotundity for a real-time detection of QRS complexes in ECG signals. In reconstructing phase portrait the mapping parameters, time delay, and mapping dimension play important roles in shaping of portraits drawn in a new dimensional space. Experimentally, the optimal mapping time delay for detection of QRS complexes turned out to be 20 ms. To explore the meaning of this time delay and the proper mapping dimension, we applied a fill factor, mutual information, and autocorrelation function algorithm that were generally used to analyze the chaotic characteristics of sampled signals. From these results, we could find the fact that the performance of our proposed algorithms relied mainly on the geometrical property such as an area of the reconstructed phase portrait. For the real application, we applied our algorithm for designing a small cardiac event recorder. This system was to record patients' ECG and R-R intervals for 1 h to investigate HRV characteristics of the patients who had vasovagal syncope symptom and for the evaluation, we implemented our algorithm in C language and applied to MIT/BIH arrhythmia database of 48 subjects. Our proposed algorithm achieved a 99.58% detection rate of QRS complexes.

Algorithms↗