• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 춘계학술대회 논문집
• /
• pp.1154-1159
• /
• 2008

Type of the high-speed train under development has been decided to be EMU(electric multiple Units) following the trend of the times, which is weak for vibration and noise due to the distributed traction unit of motors and gears than that of the articulated high-speed train. Also, passengers may feel uncomfortable at high-speed running due to the various vibration of vehicle itself and bogie, especially due to hunting, snake motion of the high-speed train. In this paper, explained was the program to develop the high-speed EMU at every step of basic and detail design and running test, predict and try to reduce the vibration.

• 영어어문교육
• /
• 제15권2호
• /
• pp.27-49
• /
• 2009

This study aimed to explore EFL learners' beliefs and preferences about reading tasks and to examine the reading processes that they use for making sense of text. The subjects were comprised of 107 college students who were non-English majors and aged 19-28 years. Based on scores achieved on a reading comprehension test, they were divided into two groups (more-skilled and less-skilled readers) and asked to respond to a survey in class. The results of the survey revealed that: (1) a majority rate themselves as fair readers, which might be indicative of the insecurity they feel toward L2 reading; (2) authentic texts (especially magazines) and popular media appear to be their favorite reading materials; (3) unknown vocabulary is a major impediment to their L2 reading comprehension; (4) the more-skilled readers manifest a meaning centered view of reading, whereas the less-skilled readers center on vocabulary; and (5) both groups employ a multistrategic approach to L2 reading; however, the less-skilled readers are less successful in determining the meaning of unknown vocabulary. Pedagogical implications for EFL classroom teachers are provided.

• 아동학회지
• /
• 제25권6호
• /
• pp.191-203
• /
• 2004

This study was to investigate differences in depression, parenting, and peer relationship perceived by adolescents from divorced and non-divorced families. Also, aim that identifies variables which have influences on adolescents' depression. The subjects were 356 middle and high school students who live in Seoul and Incheon. All respondents answered by self-report questionnaire. Data were analyzed by t-test and hierarchical regression. The major findings were as follows. First, adolescents from divorced families perceived more depression than those from non-divorced families. Second, adolescents from divorced families perceived parenting attitude less warm than those from non-divorced families. Third, adolescents from divorced families perceived themselves more isolated and less understood in their peer relationships than those from non-divorced families did. Finally, adolescents from divorced families who feel less isolated and perceive parenting attitude more warm and less maturity-demanding perceived less depression.

• 한국자동차공학회논문집
• /
• 제9권3호
• /
• pp.164-172
• /
• 2001

Various HILS systems for developing and testing vehicle mechatronic systems have been proposed and constructed during the last few years. However, performance of those systems have not been evaluated in a systematic way. Based on the transfer function approach, this paper presents a method far evaluating performance such as stable dynamic simulation range of a proposed steering HILS system. In the evaluation, we have investigated effects of time delays that exist in the real-time dynamic simulation, additional actuators, and data transmission on the stable dynamic simulation range, simulation frequency range, and steering feel. This evaluation methodology may be useful to help engineers develop a HILS system for their own purposes.

• 대한예방의학회:학술대회논문집
• /
• 대한예방의학회 1994년도 교수 연수회(역학)
• /
• pp.188-195
• /
• 1994

To an increasing extent, case-control studies are being undertaken to determine if use of early detection procedures is associated with reduced mortality from cancer. The authors recommend that in such studies the analysis focus on screening activity in cases that occurs during an interval prior to diagnosis in which the cancer is believed to be detectable and still curable and to a corresponding time period in controls. This approach places a heavy burden on the investigator to estimate accurately the period during which the tumor ought to be detectable using the test in question and to sort out reliably tests done in response to signs or symptoms of the cancer from screening tests per se. Nonetheless, the authors feel that it offers the greatest ability to discern a true benefit of screening, while minimizing the numerous potential biases that can be present in this type of study.

• Journal of Power Electronics
• /
• 제10권2호
• /
• pp.176-180
• /
• 2010

This paper deals with a control method to reduce the torque ripple of a permanent magnet synchronous motor (PMSM) for electric power steering (EPS) systems. Such an application requires a very low torque ripple in order to maintain a good steering feel. However, because of spatial limitations, it cannot help having a partial saturation in the iron core of the PMSM for an EPS system, and this saturation results in a significant torque ripple. Thus, this paper analyzes the torque ripple caused by the magnetic saturation of a PMSM and proposes a method with respect to inductance measurement to verify the partial saturation. In addition, it is shown that a compensation current is needed in order to minimize the torque ripple when a PMSM is driven in the high torque region. The estimation process of the current and the torque ripple decreased by the current are presented and verified with test results.

• International Journal of Internet, Broadcasting and Communication
• /
• 제14권4호
• /
• pp.228-239
• /
• 2022

Many countries around the world using ICT technologies have various technologies to keep pace with the 4th industrial revolution, and various algorithms and systems have been developed accordingly. Among them, many industries and researchers are investing in unmanned automation systems based on AI. At the time when new technology development and algorithms are developed, decision-making by big data analysis applied to AI systems must be equipped with more sophistication. We apply, Pearson's correlation analysis is applied to six independent variables to find out the job satisfaction that office workers feel according to their job characteristics. First, a correlation coefficient is obtained to find out the degree of correlation for each variable. Second, the presence or absence of correlation for each data is verified through hypothesis testing. Third, after visualization processing using the size of the correlation coefficient, the degree of correlation between data is investigated. Fourth, the degree of correlation between variables will be verified based on the correlation coefficient obtained through the experiment and the results of the hypothesis test

• International Journal of Advanced Culture Technology
• /
• 제12권2호
• /
• pp.326-333
• /
• 2024

This is a descriptive correlational study aimed at determining the relationship between SOC strategy, life satisfaction, and successful aging in middle-aged women. The study population was middle-aged women aged 40-65 years living in one metropolitan city, and 295 data collected using a structured questionnaire were used to analyze the results. The collected data were analyzed using descriptive statistics, independent t-test, one-way ANOVA, and Pearson's correlation using SPSS WIN/PC 24.0 statistical program. In the results of this study, the general characteristics related to successful aging in middle-aged women were identified as age, occupation, religion, economic status, presence of chronic diseases, and health status perception, menopause as significant influencing variables. In addition, successful aging was positively related to SOC strategy and life satisfaction among the middle-aged women in this study (p<.05). In particular, life satisfaction was highly correlated with successful aging in this study, and in this regard, efforts should be made to develop various programs to help middle-aged women feel satisfied with their lives so that they can transition to successful aging.

• 한국농촌생활과학회지
• /
• 제5권2호
• /
• pp.93-106
• /
• 1994

The purpose of this study was to develop the pattern of bodysuit and to identify the wear fitness of it The methods of statistical analysis applied to the study were ANOVA and cluster analysis. The materials used in making bodysuit were Nylon/Polyurethane, lace, power net, binding tape, and hook eye. The try-on test was administered in two aspects ; (1) the comparison of anthropometric data before and after trying on the experimentally constructed bodysuit with those of marketing bodysuit, (2) the sensory evaluation to estimate the wear fitness in terms of appearance and motion function. The conclusions obtained are as follows ; 1. In the survey of wearing state, 52.2% of respondents had experience of wearing bodysuit. 60.6% of them responded to the item, “well-balanced body” in the question about the purpose of wearing it. 55.7% considered the item, “feel choky in the chest” as uncomfortable point in putting on bodysuit. 48.3% felt the portion of crotch drawn above in taking exercise or behaving routinely in everyday life. 2. As for the characteristics of the bodysuit design, the scooped neckline and horizontal outline without wire in lower bust was used, the adjust point being located right above the perineum point, and the length of bodysuit is as far as trochanteric point. 3. In comparing anthropometric data of the subjects, there was significant difference in the height of lower bust the distance around abdomen, and the length of bust point(right, left) between the experimentally constructed bodysuit and the marketing bodysuit. 4. Concerning the results of the try-on test in appearance, the estimates of expert panel, which were in agreement with those of subjects in mean value and composite reliability coefficient, showed that the pattern fitness of experimentally designed bodysuit was higher than that of marketing bodysuit. 5. To take try-on test in motion function, motion was classified the five steps. The results of the test showed that experimentally designed bodysuit was fitter in each steps of motion than marketing bodysuit.

• 한국초등수학교육학회지
• /
• 제6권1호
• /
• pp.59-76
• /
• 2002

본 연구는 수학 지필 평가에서 발생하는 오해의 유형과 요인을 사례를 통하여 분석하고, 이러한 오해를 줄일 수 있는 방안을 모색하고자 하였다. 지필 평가에서 나타난 오해는 편집의 부적절에 의한 오해, 체계의 부적절에 의한 오해, 형식적ㆍ전형적 습관에 의한 오해, 문제 상황의 부적절에 의한 오해의 네 가지 유형으로 나뉘어진다. 오해의 요인 유무에 따른 성취도를 보면, 오해의 요인이 있는 검사지 A형은 오해의 요인을 배제한 검사지 B형에 비해 성취도가 10% 이상 낮게 나타났다. 또한, 오해의 요인이 포함된 문항만을 따로 구분하여 성취도를 비교할 경우, 그 차이는 더욱 커서 약 22%의 차이를 보였다. 그리고, 오해의 유형별로는 체계가 부적절할 경우 오해의 정도가 더 심각하게 나타났으며, 여러 가지 유형이 복합될수록 오해 사례는 더욱 높게 나타났다. 본 연구를 통하여 얻은 결론은 네 가지이다. 첫째, 교사는 정확한 평가를 위한 시험지 개발 노력에 힘써야 한다. 둘째, 교사는 학생이 문제 풀이 과정에서 느끼는 오해의 요인이 무엇인지를 알아야 한다. 셋째. 지필 평가에서 교사가 중요하게 생각해야 하는 것은 학생의 사고 과정을 분석하는 일이다. 넷째, 교사는 학생들과의 원활한 의사 소통에 힘써야 한다.