• Title/Summary/Keyword: Comparison Test

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A Study on the Compensation Method in the Measuring System for Chopped Lightning Impulse (충격전압 재단과 측정을 위한 보상회로에 관한 연구)

  • Kim, Ik-Soo;Kim, Young-Bae;Kim, Jin-Gi;Kim, Min-Kyu
    • Proceedings of the KIEE Conference
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    • 1996.07c
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    • pp.1895-1897
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    • 1996
  • Lightning impulse voltage is essential to evaluate the insulation performance of electric power apparatus. Recently international standard (IEC-60) on high voltage measurement techniques are being revised. In the draft of this standard, a new calibration method is introduced and the accuracy of most industrial measuring systems is maintained by means of comparison test against the reference measuring systems. Comparison tests of dividers for chopped lightning impulse measurement were rallied out by KERI. The 700kV shielded resisitive divider with and without compensation element were done comparison test with 300kV PTB divider which have the similar charateristics as that were circulated among the laboratories. This paper reports on the calculation results of response charateristics obtained by EMTP and the comparison test results with chopped lightning impulse voltages from 150kV to 250kV. It is demonstrated that KERI are capable of realizing the idea in the revision of the IEC standand, that is, to establish traceability.

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Validity of the Comparison Question Test: An fMRI Study (폴리그라프 비교질문검사의 타당성: fMRI 연구)

  • Jeon, Hajung;Eum, Young-Ji;Sohn, Jin-Hun;Eom, Jin-Sup
    • Science of Emotion and Sensibility
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    • v.21 no.2
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    • pp.113-124
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    • 2018
  • The logical assumption of the comparison question test (CQT) is that the guilty person pays more attention to the relevant questions than to the comparison questions, and that the innocent person pays more attention to the comparison questions than to the relevant questions. The purpose of this study was to verify the logic of the comparison question test using functional magnetic resonance imaging (fMRI). The participants were tested for brain responses during a mock crime and performed the CQT under guilty and innocent conditions. After brain imaging, we evaluated the psychological burden of responding to the relevant questions and comparison questions. In the guilty conditions, the degree of burden was higher for the relevant questions than the comparison questions, and there was no significant difference in the innocent conditions. The fMRI results showed that, in the guilty conditions, greater activation was observed in the right superior temporal gyrus and right inferior frontal gyrus when relevant questions were presented relative to comparison questions. Based on these findings, the logical assumption of the CQT was discussed.

The Effects of Mass Media, Tendency for Appearance Comparison and BMI on Female High School and College Students' Eating Behavior (대중매체, 타인과의 외모 비교 및 신체질량지수가 여고생 및 여대생의 섭식태도에 미치는 영향)

  • Kim, Jung-Min;Han, Guen-Hee
    • Journal of Families and Better Life
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    • v.26 no.4
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    • pp.73-83
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    • 2008
  • This study examines the effects of mass media, the tendency for young women to make body comparisons, and the BMI of female high school and college students on their attitudes about eating. Participants were 392 high school students from Gyeonggi Province and 391 college students from Seoul, Gyeonggi and Chung-nam Province. Collected data were analyzed through Cronbach's ${\alpha}$, t-test, One-way ANOVA, $Scheff{\acute{e}}$ test, Pearson's correlation, and stepwise multiple regression. The findings of the study were as follows: 1) While mass media influence differed by grade, tendency for appearance comparison and attitude toward eating did not differ by grade. 2) Mass media influence, tendency for appearance comparison and attitude toward eating differed by BMI. 3) Mass media pressure, specific attributes comparison, and BMI were significant predictors of attitudes toward eating. 4) Tendency for appearance comparison played a mediating role in the relationship between mass media and attitudes toward eating.

Development and Application of a Health Belief Model Based Nutrition Education Program for Day Care Center Children (건강신념 모델에 근거한 보육시설 유아대상 영양교육 프로그램 개발 및 적용)

  • Sin Eun-Kyung;Lee Yeon-Kyung
    • Korean Journal of Community Nutrition
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    • v.11 no.4
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    • pp.488-501
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    • 2006
  • The purpose of this study was to develop various nutrition education materials, including an animated CD, for day care center children and their teachers and in order to apply the nutrition education programs systematically. We evaluated the effect of the nutrition education programs on nutrition knowledge in the first year, and the effect of the nutrition education programs on nutrition knowledge, food attitudes and eating behaviors in the second year in day care center children. In the first year, nutrition education foundational materials, such as the animated CD-ROM, videotape, textbook, panels, posters, slogans, leaflets, picture disks, hand puppets, stickers for compensation and poster boards were developed. The subjects were 537 children (286 boys,251 girls) aged four to six years. In the second year, nutrition education materials, such as the animated CD-ROM and textbook were developed. The nutrition education group included 368 children (177 boys 191 girls) aged four to six years, and the comparison group consisted of 108 children (54 boys,54 girls) Regarding the nutrition knowledge test results in the first year, the pre-test mean of children was 6.82, however, the post-test mean was 11.35 and showed a significant increase (p < 0.001). Regarding the nutrition knowledge test and the food attitude test results in the second yew, the nutrition education group had significantly higher scores than the comparison group in a post-test (p < 0.001). For the eating behavior test results, the post-test means between the comparison group and the nutrition education group were not significant. The test results show that several months of nutrition education is not enough to improve eating behaviors. As a result, nutrition education has improved nutrition knowledge and food attitudes in day care center children but short-term nutrition education was not sufficient to induce a change in eating behaviors. To improve eating behaviors in day care center children, nutrition education programs must be applied to day care center children in addition to their Parents and Persistent education will have to be continued.

Comparison of the Sensory Ability of Experts and Untrained Panelists to Evaluate Cooked Rince by using Five Sensory Methods (식미 관능평가 5가지 방법별 전문가와 일반인의 평가능력 비교)

  • Yoon, Mi-Ra;Kwak, Jieun;Lee, Jeong-Heui;Chun, Jaebuhm;Park, Hyang-Mee;Suh, Jung-Pil;Jang, Jae-Ki;Lee, Choon-Ki;Lee, Jeom-Sig
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.61 no.2
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    • pp.92-97
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    • 2016
  • This experiment aimed to compare the sensory ability of experts and untrained to evaluate three rice varieties by using five sensory evaluation methods. All panelists showed significant differences in their sensory abilities to distinguish among Haiami, Chucheong, and Dasan 1 rice varieties when using the duo-trio test and triangle test. The expert panelists showed a clear preference in the following order: Haiami > Chucheong > Dasan 1, when using the paired comparison test, ranking test, and multiple comparison test. However, the untrained panelists showed no significant differences in their sensory ability to distinguish between the Haiami and Chucheong varieties when using the multiple comparison test. The results indicate that, for sensory evaluation of cooked rice by untrained panelists, the paired comparison test is suitable for evaluating two samples and the ranking test is suitable for evaluating more than two samples.

Comparison of a hearing threshold level using a headphone (헤드폰을 이용한 가청역치레벨의 측정 방법 비교)

  • Kim, Deuk-Seong;Jang, Seol-Il;Kim, Dong-Jun;Lee, Yeon-Su
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.796-801
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    • 2007
  • This research presents a laboratory study about a comparison between two methods that measure a hearing threshold of the Subjects who participated in an experiment of the Jury test. The Subjects heard a signal by a headphone. The Subjects of total 63 persons (man=42, woman=21 persons) participated in an experiment. A test of hearing was divided into two (Top-Down, Bottom-Up) methods. Total time of hearing test was about 80 minute(40min/day). As a results of the hearing test, a hearing threshold of the Subjects who used to wear a headphone was higher than that of the Subjects who not used to wear a headphone. A hearing threshold of a man was higher than that of a woman. The result of hearing test was showed that ISO's hearing threshold(MAF) was lower than a result that get from an experiment.

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A Study on the Techniques of Simulation Test in Automotive Braking System (자동차 제동장치의 시뮬레이션 시험 기법에 관한 연구)

  • 민규식;김형섭
    • Journal of the Korean Society of Safety
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    • v.8 no.2
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    • pp.23-29
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    • 1993
  • In this study, the method of deciding simulation test conditions is developed by computer program compared to actual vehicle test as accurately as possible. These results of analytical test conditions are conformed by simulation test using the brake dynamometer by comparison with test results of actual vehicle. Results of simulation test by these analytical results show good agreement with the vehicle test results. The analytical simulation test conditions provide the input data to brake dynamometer which follows : - each test inertia corresponding to braking deceleration - test condition of input control : brake line pressure - test condition of output control : braking torque

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Performance Evaluations of the Lightning Impulse Voltage Measuring System by Intercomparative Test - in case of full lightning impulse voltage - (뇌충격 측정시스템의 비교시험에 의한 성능평가 - 전파 뇌충격전압 인가시 -)

  • Kim, Ik-Soo;Kim, Young-Bae;Lee, Hyeong-Ho
    • Proceedings of the KIEE Conference
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    • 1995.07c
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    • pp.1368-1370
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    • 1995
  • Lightning impulse voltage is essential to evaluate the insulation performance of electric power apparatus. Recently international standard(IEC-60) on high voltage measurement techniques are being revised. In the draft of this standard, a new calibration method is introduced and the accuracy of most industrial measuring systems is maintained by means of comparison test against the reference measuring systems. Intercomparison tests of dividers for lightning impulse measurement were carried out by KERI. The shielded resisitive divider with 700kV rating developed by KERI were done comparison test with PTB divider with 300kV rating which have the similar charateristics as that were circulated among the laboratories. This paper reports on the comparison test results with full lightning impulse voltages from 126kV to 240kV. It is demonstrated that KERI are capable of realizing the idea in the revision of the IEC standand, that is, to establish traceability.

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Effects of Moutan Cortex on Corticotropin-Releasing Factor, c-Fos and Tyrosine Hydroxylase in Forced Swimming Test (목단피(牧丹皮)가 강제수영부하시험에서 Corticotropin-Releasing Factor, c-Fos 와 Tyrosine Hydroxylase에 미치는 영향)

  • Sung, Young-Suk;Lee, Tae-Hee
    • Herbal Formula Science
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    • v.17 no.1
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    • pp.129-140
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    • 2009
  • Objectives : The goal of this study was to investigate the effect of Moutan Cortex as antidepressant in forced swimming test(FST) model. Methods : The expressions of corticotropin-releasing Factor(CRF), c-Fos and tyrosine hydroxylase(TH) were measured with immunohistochemical method at paraventricular nucleus (PVN), locus coeruleus(LC) and ventral tegmental area(VTA). Results : The duration of immobility in the forced swimming test was significantly decreased in the Moutan Cortex 100 mg/kg treated group in comparison with the control group(p<0.01). CRF and c-Fos expressions at PVN were decreased in the Moutan Cortex 100mg/kg treated group in comparison with the control group. But only the expression of c-Fos was shown the significance(p<0.05). TH expressions at LC and VTA were significantly decreased in the Moutan Cortex 100mg/kg and 400mg/kg treated group in comparison with the control group(p<0.001). Conclusion : According to the results, Moutan Cortex has the antidepressant effect by showing the reduced immobility through the reduction of c-Fos expression at PVN and the reduction of TH expression at LC and VTA.

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AN INVESTIGATION INTO RADIATION LEVELS ASSOCIATED WITH DISMANTLING THE KOREA RESEARCH REACTOR

  • Choi, Geun-Sik;Kim, Hee-Reyoung;Han, Moon-Hee
    • Nuclear Engineering and Technology
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    • v.42 no.4
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    • pp.468-473
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    • 2010
  • We confirmed that the dismantling of two research reactors with thermal power of $2MW_{th}$ and $100kW_{th}$, respectively, reveals no significant difference between the radiation levels of the research reactor site and the surrounding environment far away from it, from the radiation level aspect. Radiation dose and radioactivity were measured at monitoring points around the research reactor site of the Korea Atomic Energy Research Institute (KAERI) in Seoul and comparison points 0.5 km to 3.3 km from the site. To grasp trends in the radiation levels during dismantling from the end of 2002 to the end of 2007, the gamma radiation dose rate, the accumulated dose, and the radioactivity of the strontium, tritium, and gamma isotopes were statistically treated and estimated. The averages of these items between the two groups, the research reactor site and comparison points, were assessed by applying a T-test with a significance level of 0.05. P-values found by using the T-test were from 0.12 to 0.83 where the values were much higher than the significance level. As a result, no difference was observed between the radiation levels at the research reactor site and at the comparison points by this T-test. This study showed that dismantling activity of the Korea Research Reactor of the Seoul site did not expose the public or the environment to harmful levels of radiation.