• Microbiology and Biotechnology Letters
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• v.27 no.4
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• pp.344-348
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• 1999

A competitive enzyme-linked immunosorbent assay(ELISA) for the detection of antibodies to Treponema pallidum(T.pallidum) was developed and evaluated. T.apllidum lysate was immobilized on the surface of microplate wells and horseradish peroxidase labeled human anti-T.pallidum lysate was immobilized on the surface of microplate wells and horseradish peroxidase labeled human anti-T.pallidum was prepared and used as a tracer. The performance of the competitive ELISA was evaluated by using different specimens. The competitive ELISA showed a sensitivity of 100% in a performance panel consisting of serum and plasma with anti-T.pallidum reactivity ranging from negative to strong positive by FTA-ABS test system and 120 plasma samples positive by TPHA. The specificity of the competitive ELISA was 100% in 1,200 plasma samples collected from healthy seronegative blood donors. These results suggest that the competitive ELISA provides an excellent assay method for the detection of antibodies to T.pallidum, and may be particularly useful for serological blood screening of syphilis.

• KIEAE Journal
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• v.16 no.1
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• pp.5-10
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• 2016

Purpose: The energy consumption in buildings has continuously increased in some countries and it reaches almost 25% of the total energy use in korea. Therefore there are various efforts to minimize energy consumption in buildings, and the regulations on building envelope insulation have been tightened up gradually. To satisfy the building regulation, the use of vacuum insulation panels(VIPs) is increasing. VIP is a high performance insulation materials, so that it can be thinner than conventional insulation material. When VIP is applied in a building, it may cause thermal bridge, which occurs due to very low thermal conductivity compared to other building materials and the envelope of VIPs. Method: This study designed the capsulized VIPs using conventional insulation for reduction of the thermal bridge. Then designed VIPs were applied to a wall. The linear thermal transmittance and the effective thermal conductivity were analyzed by HEAT2 simulation program for two dimensional steady-state heat transfer. The result compared with a wall with non-capsulized VIPs. Result: It analyzed that the wall with capsulized VIPs had lower linear thermal transmittance and reduced the difference of the effective thermal transmittance with one dimensional thermal transmittance compared to that of the wall with non-capsulized VIPs.

• KIEAE Journal
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• v.13 no.6
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• pp.45-53
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• 2013

For the target goal of Zero-energy House construction in 2025, the government announced that the insulation regulations will be continuously enhanced. It has been predicted that high-performance insulation materials, such as vacuum insulation panel (VIP), should be used to decrease the thickness of outer walls. The aim of this study was to evaluate the performance of adhesively fixed external insulation and finish system (EIFS) with VIP. The energy performance of a base model with conventional internal insulation system and three alternatives of EIFS with VIP were analyzed by three-dimensional heat transfer simulation. Construction cost and convenience of each alternative were also evaluated and compared. As results, effective alternatives in terms of each performance as well as overall performance considering the weighting factors of each performance were suggested.

• Journal of Labour Economics
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• v.32 no.2
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• pp.61-93
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• 2009

In this paper, we estimate the wage premium of English skills in the Korean labor market using Korean Labor and Income Panel Study(KLIPS) data. In a simple OLS model, we find that people with some English skills in terms of self evaluation or job requirement earn 30% more than those who do not have English skills. But in a small sample of relatively young people, higher English lest scores do not raise earnings. When we add SAT scores in the wage equation, there is no wage premium of English skills, and in the IV estimation, we find no "English premium". These results consistently imply that while there is a large wage premium of English skills in the Korean labor market, it reflects unobservable ability for the most part. Meanwhile some of the regression results favor human capital theory over screening theory as an explanation of the nature of the wage premium of English skills.

• Journal of the Korean Wood Science and Technology
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• v.44 no.2
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• pp.274-282
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• 2016

This aims of this study were to investigate the relationship between non-destructive evaluation (NDE) and actual bending properties of particleboard, and to predict the bending properties of three-layer particleboard. Three kinds of raw materials, i.e. Hinoki (Chamaecyparis obtusa Endl.) strand, knife-milled Douglas-fir (Pseudotsuga manziesii (Mirb) Franco), and hammer-milled matoa (Pometia spp.) obtained from wooden industry, were utilized as furnish for experimental panel with methylene diphenyl diisocyanate (MDI) resin as binder. The NDE test was conducted by hit sounds using an FFT analyzer according to the spectrum peak of wave frequency, while the static bending test was conducted according to JIS A-5908. The results reveal that the dynamic Young's modulus as an NDE test has a potential for being used to predict the elastic bending of particleboards by a specific equation for adjusting its proper values. The values of NDE and static test are significantly different with a deviation range at 3-20%. The bending stiffness of three-layer particleboards manufactured from different wood species is predictable by observing the bending stiffness of two elements based on the thickness of its layers. The predicted values of bending stiffness and static test are significantly different with a deviation range at 5-24%.

• Journal of Korean Academy of Nursing
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• v.45 no.5
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• pp.752-760
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• 2015

Purpose: The purpose of this study was to examine the moderating mediation effect of self-esteem on the relations among adolescents' abuse experiences, depression and anxiety, and suicidal ideation. Methods: The participants were selected using secondary data from a population in the 2012 Korea Welfare Panel Survey (KOWEPS). Data were analyzed using SPSS 15.0 and SPSS Macro, and bootstrapping and hierarchical regression analysis were performed to analyze multilevel models. Results: First, analysis of the mediating effect of the adolescents' abuse showed that there was significant mediating influence between suicidal ideation and depression and anxiety. Second, hierarchical regression analysis showed that self-esteem had significant mediation effect on depression and anxiety in adolescents' suicidal ideation. Third, SPSS Macro showed that self-esteem also significantly moderated the mediating effect of adolescents' abuse experiences on suicidal ideation through depression and anxiety. Conclusion: The study results suggest that in future research on adolescent's abuse experience, the risk of suicide in depression and anxiety scores should be selected through evaluation of each individual's self-esteem scale. Coping strategies with immediate early intervention should be suggested.

• Culinary science and hospitality research
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• v.9 no.3
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• pp.169-181
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• 2003

안면 특정 근육의 움직임으로부터 기록되는 Electronic Sensing System(ESS)신호는 인간의 관능검사에 사용할 수 있다. 본 연구는 ESS를 이용하여 저작패턴에 따라 나타나는 결과들을 분석, 분류하고 각 그룹별로 같은 식품에 대한 관능 감지도의 차이를 검사하기 위하여 각 그룹별 씹는 특성을 파악하여 이에 따라 패널요원들을 선발하였다. 패널들을 젊은 남$.$여 및 노년 남$.$여 총 4그룹으로 구분하여 껌 및 당근의 저작과정에 대한 패턴 즉 속도, 시간 및 총 에너지를 비교한 결과, 젊은 남$.$여 그룹(n=47, 18∼42세, 남성 27명, 여성 20명) 및 노년 남$.$여 그룹((n=44, 65세 이상, 남성 33명, 여성 31명)은 저작 특성들이 서로 달라 같은 식품에 대하여 서로 관능감지도가 달라질 수 있음을 나타내었다. 또한 ESS에 의한 각 패널들의 검사치를 분석한 결과 껌을 씹을 때의 에너지에 대한 표준편차는 2.0 이하(n=71)그리고 씹는 속도의 경우는 0.1 이하로 반복실험의 재현성이 있었다. 91명의 패널들을 저작 에너지 및 씹는 속도에 따라 4그룹(낮은 에너지를 사용하며 천천히 씹는 그룹, 낮은 에너지를 사용하면서 빨리 씹는 그룹, 높은 에너지를 사용하며 천천히 씸는 그룹, 그리고 높은 에너지를 사용하며 빨리 씹는 그룹)으로 분류하고 각 그룹별 평균값에 가장 비슷한 양상을 나타내는 6명씩 총 24명의 관능검사 요원들을 선발하였다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.20 no.11
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• pp.3525-3537
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• 1996

This paper presents a CAD program develpoed on a microcomputer in order to support graphic and computational assessment of ergonomic problems associated with the design of a man-in-cab system. The program is coded to help workspace designers with ergonomic evaluations needed in the design stage. This paper proposed a biomechanical -ergonomic evaluations needed using man and workplace models. The human model is developed to have dimensions obtained from the Korean anthropometric data reported in 1992. Its graphical representation is based on a wire-frame model but, whenever necessary, body segments can be represented by a solid model with hidden line/faces removed and shaded. Workplace models are presented for cabs of the excavator, one of the most popular construction vehicles. A workplace model consists of an operator seat, a steering wheel. two control levers, two pedals, and a control panel. The workplace elements can be modified in their sizes, positions, and orientations by changing the reference point and design parameters. An algorithm for the view test is suggested and loaded to provide a visual evaluaiton of the overall layout of a workplace model.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.30 no.4 s.247
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• pp.306-313
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• 2006

Automated material handling system is being used as a method to reduce manufacturing cost in the semiconductor and flat panel displays (FPDs) manufacturing process. Those are considering switch-over from the traditional cassette system to single-substrate transfer system to reduce raw materials of stocks in the processing line. In the present study, the wafer transportation speed has been evaluated by numerical and experimental method for three propulsion nozzle array (face, front, rear) in an air levitation system. Test facility for 300 mm wafer was equipped with two control tracks and a transfer track of 1,500mm length. The diameter of propulsion nozzle is 0.8mm and air velocity of wafer propulsion is $50\sim150m/s$. We found that the experimental results of the wafer transportation speed were well agreed with the numerical ones. Namely, the predicted values of the maximum wafer transportation speed are higher than those values of experimental data by 16% and the numerical result of the mean wafer transportation speed is higher than the experimental result within 20%.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.689-692
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• 2008

Noises from ceiling mounted air-conditioning units were recorded in various actual situations such as offices, classrooms and libraries. Eight specimens of air-conditioners from major domestic and foreign manufacturers' were investigated in this study. A head and torso simulator was located 1.5 m beneath the air-conditioner panel for the measurements and sound pressure levels of the recording sounds were varied from 28 to 55 dBA with 3 dB steps for subjective evaluations. A total of 88 stimuli was randomly presented to subjects using a headphone system in semi-anechoic chamber. Two-categorized (noisiness and amenity) nine-point scale was used as evaluation method. The third scale ('point 3') among the nine-point scale was set as the threshold of allowable level of the air-conditioning sounds in consideration of the real situations. The results indicate that the allowable sound pressure level is around 34 dBA for both noisiness and amenity categories.