• Research in Community and Public Health Nursing
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• v.5 no.2
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• pp.181-202
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• 1994

This study was conducted in order to grasp the condition of the student's knowledge and attitude about tuberculosis. And to offer the basic materials for the prevent tuberculosis in elementary school. The objects were comprised 395 of volunteered 6th grade students who study in two elementary schools. The material of this study was the questionaire(chronbach $\alpha=.9016$) suited to the purposed of this research which has been made through studying references. All the questionaire were collected immediately without explanation. The data was collected from 13rd to 25th of May on 1994. Analysis of the data was done utilizing SPSS for percentage, mean, ANOVA and pearson-Correlation Coefficient. The Result are as follows; 1. General features of the objects of study. Sex distribution was similar. Salary of 1000-1500 thousand won were highest (40.2%), nuclear family was highest (87.1%), fathers of graduated high school were the highest(44.0%), mothers of graduated high school were the highest(56.8%). And there was nobody about tuberculosis patient in one's close relatives were highest(95.4%). 2. The conditions of attitude about tuberculosis. Having experience of tuberculin test were highest(59.0%). Less than 9mm indulation among the tuberculin tested group were 85.1%, more than indulation were 14.9%. Have a B. C. G. injection among the less than 9mm indulation were 83.2%. Leave alone among the more than 10mm indulation were 56.0%. Think it too much trouble to do not tuberculine test were 63.0%. Do not take a chest X-ray in the past were 60.3%. And take a chest X-ray in the past were 39.7%. Health educated group was 74.3%. If tuberculosis sign was developed, notified to parent was 73.8%. 3. The condition of knowledge about tuberculosis. When 5 points was given to 'very affiming' and 1 point was given to 'very deny', the total average was 3.54. And symptom of tuberculosis secion was 3.67, vaccination of tuberculosis section was 3.66, tuberculine test section was 3.56, epidemiology of tuberculosis section was 3.54, infection of tuberculosis section was 3.38. And every section showed affirmative correlation(P<.001). 4. Correlation between the general features and attitude variables. High incomed group may have more attitude on tuberculin test than low incomed group($x^2=16.$ 190, P<.01). High educated group may have more attitude on tuberculin test than low educated group(Father : $x^2=28.530$, P<.001, Mother: $x^2=26.060$, P<.001). High educated group may have more attitude on health education than low educated group(Father: $x^2=20.$ 767, P<.000, Mother: $x^2=10.639$, P<.05). Nuclear family may have more attitude on notify to parent than others($x^2=51.45$, P<.000). Tuberculosis patient in one's close associates have more attitude on notify to parent than others($x^2=51.$ 45, P<.000). 5. Difference between the general features and knowledge of tuberculosis. High incomed group were highest score in knowledge (F=3.99, P<.01). High educated group were highest score in knowledge(Father : F=8.81, P<.000, Mother: F=9.09, P<.000). 6. Difference between the attitude and knowledge of tuberculosis. Tuberculin tested group were highest score in knowledge(t=9.88, P<.000). Taken chest X-ray group were highest score in knowledge (t=2.07, P<.05). Received health education group were highest score in knowledge(t=6.83, P<.000). Notified symptoms to teachers and parent group were highest score in knowledge(F=3.89, P<.01).

• Journal of the Korean Ceramic Society
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• v.13 no.2
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• pp.24-30
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• 1976

To observe the influence of tetrahedral and octahedral preference of cations of Ni2+, Ti4+ upon the formation and the color development of the MgO-SnO2 spinel containing Ni2+ and Ti4+ ions, the gradual substitution of Ni2+ ions for Mg2+ ions and of Ti4+ ions for Sn4+ ions of the spinel in NiO-MgO-SnO2-TiO2 system was carried out. On samples prepared by calcining the oxide and basic carbonate mixtures at 130$0^{\circ}C$ for 1.5 hour, the X-ray analysis, measurement of reflectance and the test of their stability as a glaze pigment were also carried out. On samples prepared by calcining the oxide and basic carbonate mixtures at 130$0^{\circ}C$ for 1.5 hour, the X-ray analysis, measurement of reflectance and the test of their stabiality as a glaze pigment were also carried out. The results are summarized as follows. 1) As increasing the amounts of Ni2+ ions in the xNiO.(2-x)MgO.SnO2 system, spinel was not formed easily, and the mixed-spinel was formed in NiO.MgO.SnO2 of x=1 but the spinels was not formed completely in the range of x>1.5 2) The spinels was not more formed in NiO-MgO-TiO2 system than NiO-MgO-SnO2 system. Therefore, Ti4+ ions have strong octahedral preference than Sn4+ ions. The color changed the yellow region little. The mixed-spinel or non-spinel was formed easily NiO.TiO2, MgO.TiO2 of illmenite type as the gradual substitution of Ti4+ ions for Sn4+ ions. 3) The results of glaze test. The color changed from white through graish brown to brown as the gradual substitution of Ni2+ ions for Mg2+ ions in calcium-zinc glaze and calcium glaze, and from white through light yellowish beige to dull beige in tile glaze. Also, the color did not change generally as the gradual substitution of Ti4+ ions for Sn4+ ions in NiO-MgO-SnO2-TiO2 system.

• ETRI Journal
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• v.8 no.3
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• pp.44-50
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• 1986

본고는 현재 수행중에 있는 ISDN 프로토콜 연구 과제에 속하는 프로토콜 검증장치구현과 관련하여 X. 25 Product의 level 2에 대해 conformance test를 실시하는데 사용된 테스트 방법, 테스트 시스팀 구성, 테스트 시나리오 등의 테스트 환경과 실제 테스트를 실시한 결과 등을 중심으로 기술하였다.

• Journal of Ginseng Research
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• v.8 no.2
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• pp.167-171
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• 1984

Soft X-ray is useful to identify the quality of fresh ginseng causing the inside cavity or white pan of red ginseng. The portion of low mass density identified by the difference in absorption of soft X-ray showed lower dry matter density and less or no response to iodine test indicating less accumulation or excess consumption of starch. The inside white part of red ginseng absorbed less X-ray than the normal part did. Probability for identification of the inside cavity or white at fresh ginseng was rather high (80-90%) in screen observation than f'3m reading and seemed to be increased further by using the developed screen and with training. The inside white of red ginseng appeared to be due to starch deficiency. Dry matter density appeared to be better than fresh weight density for the quality criterion.

• Journal of Ocean Engineering and Technology
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• v.8 no.2
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• pp.157-165
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• 1994

Effect of an accelerated iso-thermal aging (375 degree C x 66days, 375 degree C x 200days) on elastic-plastic fracture resistance curve were examined in SA533B low alloy steel. Fracture toughness test are conducted by unloading compliance method at room temperature. But the apparent negative crack growth phenomenon, usually arise in partial unloading compliance test. The phenomenon of negative crack growth may be eliminated by the offset technique. There is no effect of aging on J sub(IC) and dJ/da in iso-thermal aged (375 degree C x 66 days) specimen, but there is very little effect in iso-thermal aged (375 degree C x 200 days) specimen.

• Transactions of the Korean Society of Automotive Engineers
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• v.21 no.6
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• pp.64-71
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• 2013

In this study we designed a lean $NO_x$ trap (LNT) model with $GT-POWER^{TM}$ program and then the LNT model was compared to the bench flow reactor test results. This model consists of 9 kinetic reactions to represent the main steps of NO oxidation, $NO_x$ adsorption, $NO_x$ release and then its reduction. The comparison was performed on the operating conditions at the space velocity of 50,000 1/hr and 80,000 1/hr with the temperature range of $200^{\circ}C{\sim}500^{\circ}C$ with the even spaced temperature step of $50^{\circ}C$. The experimental results show that the $NO_x$ conversion efficiency was enhanced by the temperature up to $350^{\circ}C$ and then decayed at higher temperatures. The LNT model predicts the similar trend of the $NO_x$ conversion efficiency to the experimental results below $350^{\circ}C$, but overestimates above $350^{\circ}C$. This overestimation comes from the higher reduction efficiency which was obtained by the different reduction gas composition such as $C_3H_6$ in the model to replace $CH_4$, $C_2H_4$ in the bench test.

• International Journal of Railway
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• v.6 no.2
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• pp.78-84
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• 2013

This paper is about the first experiment in Korea that was conducted on speeding increase up with rail speeds at 430km/h at high speed railway of designed 350km/h. and analysis data collected on vibration accelerations of roadbed. There are barely references on roadbed behavior measurement with rail speeds more than 350 km/h in Korea as it has never been conducted the experiment on it. So the experiments were confirmed the reliability through crosschecking the figures/values from respective sensors and measuring devices after measuring EMS and ICP types. Based on the study, values of vibration acceleration were less than 12% compared with the ones that conducted while speeding up of HEMU-430X. Also, figures of HSB for concrete bed tracks were 52% against the standard. According to the results, all the performance evaluation of vibration acceleration for roadbeds in transition zones is under the standard.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1993.06a
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• pp.865-868
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• 1993

This paper describes a simple random signal generator employing by CMOS analog technology in current mode. The system is a nonlinear dynamical system described by a difference equation, such as x(t＋1) = f(x(t)) , t = 0,1,2, ... , where f($.$) is a nonlinear function of x(f). The tent map is used as a nonlinear function to produce the random signals with the uniform distribution. The prototype is implemented by using transistor array devices fabricated in a mass product line. It can be easily realized on a chip. Uniform randomness of the signal is examined by the serial correlation test and the $\chi$2 test.

• Tribology and Lubricants
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• v.13 no.2
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• pp.39-45
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• 1997

The shot peening treatment were conducted for improving the strength of rolling contact fatigue of machine element like a gear. This paper was undertaken to analyze the influence of shot peening treatment for inner race of ball bearing on the rolling contact fatigue. Shot peening treatment were applied to the full hardened and the carbonitrided bearing. And the rolling contact fatigue life test and X-ray diffraction test were carried out. The results of this study showed that the fatigue life of ball bearing in the clean and the contaminated oil could be improved by shot peening treatment. This effect was found to be more pronounced to the full hardened bearing. These facts might be due to the generation of compressive residual stress and the strain hardening of surface layer by shot peening treatment. The failure of the shot peened bearing were presumed to initiate at surface.

• Transactions of Materials Processing
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• v.33 no.2
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• pp.123-131
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• 2024

Plastic, the main material of FFF-type 3D printing, exhibits lower strength compared to metal. research aimed at increasing strength is needed for use in various industrial fields. This study analyzed three X-shape infill patterns(grid, lines, zigzag) with similar internal lattice structure. Moreover, tensile test considering weight and printing time was conducted based on the infill line multiplier and infill overlap percentage. The three X-shape infill patterns(grid, lines, zigzag) showed differences in nozzle paths, material usage and printing time. When infill line multiplier increased, there was a proportional increase in tensile strength/weight and tensile strength/printing time. In terms of infill overlap percentage, the grid pattern at 50% and the zigzag and lines patterns at 75% demonstrated the most efficient performance.