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홍진태,손광재,김종범,박종한,김진주,양태호 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
미국, 러시아 등 우주기술 선진국에서는 달탐사 착륙선 또는 로버의 달탐사 작업을 위한 전원을 공급하기 위하여 수명이 길고, 신뢰성 높은 원자력전지를 이용하여 왔다. 원자력전지는 방사성동위원소의 붕괴열을 전력으로 변환하여 전기를 생산하므로 방사선 차폐, 열전 효율을 높이기 위한 열전재료 설계 및 단열성능 확보를 위한 열제어 구조체 설계, 사고상황에서의 구조 안전성을 위한 내충격 설계 등 다양한 분야에 대한 연구가 필요하다. 한국 정부는 2020 년 탐사선을 달에 보내기로 계획하고 있으며, 착륙선이나 로버의 전력원으로서 원자력전지의 공급이 필요한 상황이다. 본 연구에서는 한국형 달탐사선을 위한 원자력전지의 구성 및 설계현황에 대해 정리하였다. Nuclear batteries have been applied to supply electric source to lunar explorers and rovers for exploration of the lunar surface owing to their long lifetime and high reliability. Because a nuclear battery generates electricity by converting decay heat of radioisotopes into electric energy, many related researches such as radiation shield, conversion efficiency of thermoelectric material, heat insulation, and shock endurance of the structure for the accident status have been carried out. Korean government plans to send lunar explorer in 2020, and a nuclear battery should be supplied as a power source for lunar lander or rover. In this study, constitution of nuclear battery and current status of RTG design for lunar mission will be introduced.
洪鎭泰 東亞大學校 1984 東亞論叢 Vol.21 No.3
Exact calculation of the various listed data on the basis of measurement theory is carried out to investigate the errors on data handling included in the scientific text books. Errors on the printed values, which are due to the rough verval explanation, are found in these books. Even if the derived values from the indirect measurement have the same significant figures as the measured values, the checking for precision is needed. Typical errors for attention in treating the data are listed on the exemplified table for a guide of handling the data and writing the book.
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.
Development of Graphite Sealing Technique for an Irradiation Test Rig of Nuclear Fuels
홍진태,안성호,정환영,정찬영 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.5
To test a newly developed nuclear fuel, a test rig needs to be made and put into the core of a research reactor. Then, high temperature and highly pressurized coolant is circulated through the test rig during the irradiation test to transfer the heat generated by the fissile activity of the nuclear fuel. Because several decades of instrumentation cables are drawn from a test rig, it is difficult to seal out the coolant in the test rig. In this study, a mechanical sealing method which uses flake type graphite powder has been developed to replace the conventional brazing process. The internal design of the test rig is modified to apply compressive stress on the graphite powder to seal out the gap between the sealing plug and instrumentation cables. The sealing performance is then verified by a hydraulic pressure test and Helium leak test according to the ASME code, section III.
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%.
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.