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PVDF 압전박막을 이용한 초음파 Spectroscopy 시스템의 개발에 관한 연구
김정구,홍진태 東亞大學校 1996 東亞論叢 Vol.33 No.-
We have developed a new ultrasonic spectroscopy system using ultrasonic transducers fabricated with PVDF [poly(vinylidene fluoride)] polymer piezoelectric films. A new apparatus can be measured a ultrasonic nonlinear parameter B/A, which is an important parameter in ultrasonic analysis of material. The adventages of this apparatus are that it simplifies the whole system greatly and that it can measure higher harmonics simultaneously. when compared with other published results, we have found an excellent agreement. it is shown that our new ultrasonic spectroscopy system can be detected the nematic-isotropic phase transition in MBBA liquid crystal.
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.
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.
127˚원통형 정전 에너지 분석기의 Z-θ면에서의 전자의 궤적계산
이두일,진원배,홍진태 東亞大學校 1993 東亞論叢 Vol.30 No.1
The effect of an electrostatic potential of the housing, V, enclosing the electrostatic energy analyzer onthe transmission efficiency of charged particels has been discussed on the basis of numerical calculation of electron trajectories. We have certified the fact that the effect enancing the transmitted electron current intensity by increasing V in our previous papers has resulted from the refocusing of electron beams with the inclination angle βin projection on the zθ-plane.