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김재형,김수홍,백승완,전계록 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.7
The bioelectrical impedance (BI) at the inner forearms was measured using bioelectrical impedance measurement system (BIMS), which employs the multi-frequency and the two-electrode method. Experiments were performed as follows. First, while applying a constant alternating current of 800A to the inner region of the forearms, BI (Z) was measured at nineteen frequencies ranging from 5 to 500 kHz. The prediction marker (PM) was calculated for right and left forearm. The resistance (R) and the reactance (Xc) were simultaneously measured during impedance measurement. Second, a Cole-Cole plot (relationship between reactance and resistance) was obtained for left and right forearm, indicating the different characteristic frequencies (fc). Third, the phase angle was obtained, indicating strong dependence on the applied frequency.
Imaging of Cranial Nerves III, IV, VI in Congenital Cranial Dysinnervation Disorders
김재형,황정민 대한안과학회 2017 Korean Journal of Ophthalmology Vol.31 No.3
Congenital cranial dysinnervation disorders are a group of diseases caused by abnormal development of cranialnerve nuclei or their axonal connections, resulting in aberrant innervation of the ocular and facial musculature. Its diagnosis could be facilitated by the development of high resolution thin-section magnetic resonance imaging. The purpose of this review is to describe the method to visualize cranial nerves III, IV, and VI and to presentthe imaging findings of congenital cranial dysinnervation disorders including congenital oculomotor nerve palsy,congenital trochlear nerve palsy, Duane retraction syndrome, Möbius syndrome, congenital fibrosis of the extraocularmuscles, synergistic divergence, and synergistic convergence.
김재형,김광호 慶熙大學校 1990 論文集 Vol.19 No.-
In order to investigate the effect of Solidago virga-aurea L. var. leiocarpa (Benth) A. Gray(SV) on antitumor and immune response, the author performed this experimental study. Mean survival days(MSD) and Tumor weight(TW) in vivo, Natural killer cell activity(NKCA) in vitro for effect of antitumor, Delayed type hypersensitivity(DTH). Hemoagglutinin titer(HA) and Hemolysine (HL) for immune response were measured in ICR mice. The results were as follows: 1. MSD was prolonged in SV group as compared with control group with effectiveness. 2. TW was depressed in SV group as compared with control group. 3. NKCA was increased in SV group as compared with control group. 4. DTH was increased in SV group as compared with control group with statistical significance. 5. HA titer was increased in SV group as compared with control group with statistical significance. 6. HL titer was increased in SV group as compared with control group with statistical significance. The inferance from the above results is that Solidago virga aurea L. var. leiocarpa (Benth) A. Gray show to have antitumor substance and enhance immune response.
김재형,황영준,김건호,정인숙,전계록 한국멀티미디어학회 2018 멀티미디어학회논문지 Vol.21 No.1
An early detection of intravenous infiltration is essential to minimize the injuries during infusion therapy, one of the most important tasks for nurses in nursing settings. We report that bioelectrical impedance analysis is useful in the early detection of infiltration at puncture sites. When infiltration was intentionally induced in the vein of a pig's posterior ear, impedance parameters (R, XC, Cm) showed significant differences before and after infiltration. In particular, the relative resistance (R/RBI) decreased significantly at infiltration and then slowly decreased. This indicates that the vein in a pig's ear is thin and the amount of surrounding subcutaneous tissue, and hence the infiltrated (IV) solution accumulates slowly after infiltration. However, when infiltration was induced in the vein of a human's forearm, the relative resistance at 20 kHz decreased gradually over time. In the R-XC graph, the positions in the case of infiltration induced in the pig' ear shifted rapidly before and after infiltration, whereas the positions in the case of infiltration induced in the human's forearm moved gradually during infiltration. Our findings suggest that the impedance parameters (R, R/RBI, XC, R vs. XC, and Cm) are effective indicators to detect the infiltration early in a noninvasive and quantitative manners.