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Measurement of Coolant Flow in a Nuclear Fuel Test Rig
홍진태,김종범,Chang-Young Joung,안성호,허성호 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.9
The heat generation rate is one of the most important characteristics in evaluating the performance of nuclear fuel. The heat generation rate of a nuclear fuel rod can be measured indirectly by calculating the heat flux that coolant absorbs while passing by the nuclear fuel rod. To calculate the heat flux from the fuel rod, it is necessary to measure the temperature deviation and flow velocity at both end parts of the fuel rod. Thus, measuring the flow velocity in the test rig during the irradiation test of nuclear fuel is important to measure the heat generation rate. In this study, a cross correlation technique that uses signals obtained from two thermocouples instrumented at both end parts of the fuel rod has been developed to measure the flow velocity of coolant in the test rig.
Study on the Measurement Accuracy of Coolant Flowrate in a Nuclear Fuel Test Rig
홍진태,김종범,정창영,안성호,양태호,허성호 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.10
To measure the heat generation rate of nuclear fuel rods during an irradiation test, the temperature deviation of the coolant that passes by the fuel rod and its flow velocity need to be measured. Although the temperature of the coolant can be measured by thermocouples instrumented in the nuclear fuel test rig, the flowrate of the coolant is difficult to measure owing to the narrow space of the test rig. Therefore, a noise analysis technique using fluctuation signals from thermocouples installed at both end parts of the fuel rod has been developed by several advanced groups. Although the noise analysis technique was also developed at the Korea Atomic Energy Research Institute, out of pile test results showed that the accuracy of the coolant flow measurement was more than 40%. In this study, the ground pattern of the control board and earth connection are enhanced to eliminate external noise. In addition, a heater unit is installed in the coolant flow simulator to obtain a strong fluctuation signal from the coolant. Thus, the coolant flow simulator is improved, and the accuracy of the coolant flow measurement shows an error of less than 5%.
Identification of genetic loci associated with abdominal visceral adiposity in Korean populations
홍진태,조윤신 한국유전학회 2017 Genes & Genomics Vol.39 No.5
Abdominal obesity is characterized by accumulation of subcutaneous and visceral fat in the abdomen and has been reported to be largely responsible for many metabolic and vascular diseases. Although substantial effort has been dedicated to identification of genetic factors associated with abdominal obesity, as measured by the waist-hip ratio and waist circumference, only a few studies have explored associations with visceral fat accumulation in the abdomen. Furthermore, genetic studies of abdominal visceral adiposity conducted in Asian ethnic groups are rare. To gain insight into the genetic basis for visceral adiposity in Asian subjects, we conducted genome-wide association analysis for a pool of 1594 Korean subjects. Abdominal visceral fat area was estimated by computed tomography. After adjustment for age, linear association analysis identified three loci showing suggestive evidence of association (P < 5 × 10−6) in ASIC2, SLC35F3, and 5q14.2. Stratification by sex revealed one female-specific locus (rs17104731) located near LINC01519 with a genome-wide significant association for visceral adiposity (P = 4.66 × 10−8). Since visceral fat has been suggested to influence metabolic traits, we analyzed associations of the loci identified in this study with metabolic indicators, such as glucose, insulin, and lipid levels, and markers of kidney function. A locus (rs6699737) in SLC35F3 showed a nominal association (P < 5 × 10−2) with alanine transaminase, aspartate transaminase, and fasting plasma insulin. In addition, the linear association test using genetic risk score demonstrated that visceral adiposity loci detected in this study had a cumulative effect on abdominal visceral fat area, waist-hip-ratio, total cholesterol, and low density lipoprotein cholesterol. In summary, this study reports new loci associated with visceral adiposity and provides evidence supporting involvement of these loci in several metabolic traits in Korean populations.
홍진태 동아대학교 인문과학대학 인문과학연구소 1994 인문과학연구 Vol.- No.-
The purpose of this study was to compare the expressions presented in chapter 1 of "Dodugkyong", with the general concepts of physics and to investigate the concept of tao in the physical view. The equation(R-2,l0): I ↔int T→T' or (g o f)(t_(a))=g{f(t_(a))}=g(t_(b))=b is able not only to simplify the concept of tao in the physical view but also to eliminate the puzziness from Lao-tzu's description. In the intellectual knowledge of natural and human life, the contents of cognition pursuiting organic and complementary relation be useful for reducing intellectual preponderance between the heterogeneous areas. Tao is understood in the natural patterns as an existance form of energy whose attribute is dynamic and varialbe and a representation of order. Every existance cognized by modem scientific language is a form of energy. The representations of the first chapter of "Dodugkyong" show considerable analogy with moderan physical patterns in spite of the big differences of the times and descriptive language.