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백태욱,이재곤 한국섬유공학회 1982 한국섬유공학회지 Vol.19 No.3
The heat transfer modes of the fabrics are conduction, convection, and radiation. In this paper, using the thermal insulation value tester and the glass plate which covers the fabric in order to immobilize the air in the fabric, the heat transfer by conduction was considered. Analyzing the experimental results, the experimental values nearly coincided with the theoretical values. The influence of the fabric parameters on the heat transfer by conduction had been investigated and the following conclusions were obtained. 1. Supposing that fabric is the mixture of air and fibres, in the system which immobilizes the air in the fabric, the representation for the heat flow rate can be translated as (T1-T4)/[L1/{K1,(1-P)+K2P}A+L2/K3A+1/hA]=q 2. In the system which immobilizes the air in the fabric, the heat flow by conduction through tile fabric decreases with the increasing value of L1/CVf which is considered one of the parameters of the fabric.
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Texture Analysis of Gray-Scale Ultrasound Images for Staging of Hepatic Fibrosis
박언주,김승호,박상준,백태욱 대한영상의학회 2021 대한영상의학회지 Vol.82 No.1
Purpose To evaluate the feasibility of texture analysis of gray-scale ultrasound (US) images for staging of hepatic fibrosis. Materials and Methods Altogether, 167 patients who had undergone routine US and laboratory tests for a fibrosis-4 (FIB-4) index were included. Texture parameters were measured using a dedicated in-house software. Regions of interest were placed in five different segments (3, 5, 6, 7, 8) for each patient. The FIB-4 index was used as the reference standard for hepatic fibrosis grade. Comparisons of the texture parameters between different fibrosis groups were performed with the Student’s t-test or Mann-Whitney U-test. Diagnostic performance was evaluated by receiver operating curve analysis. Results The study population comprised of patients with no fibrosis (FIB-4 < 1.45, n = 50), mild fibrosis (1.45 ≤ FIB-4 ≤ 2.35, n = 37), moderate fibrosis (2.35 < FIB-4 ≤ 3.25, n = 27), and severe fibrosis (FIB-4 > 3.25, n = 53). Skewness in hepatic segment 5 showed a difference between patients with no fibrosis and mild fibrosis (0.2392 ± 0.3361, 0.4134 ± 0.3004, respectively, p = 0.0109). The area under the curve of skewness for discriminating patients with no fibrosis from those with mild fibrosis was 0.660 (95% confidence interval, 0.551–0.758), with an estimated accuracy, sensitivity, specificity of 64%, 87%, 48%, respectively. Conclusion A significant difference was observed regarding skewness in segment 5 between patients with no fibrosis and patients with mild fibrosis.
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