• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2000년도 춘계학술대회논문집
• /
• pp.388-395
• /
• 2000

Axial fans are widely used in heavy machines due to their ability to produce high flow rate for cooling of engines. At the same time, the noise generated by these fans causes one of the most serious problems. This work is concerned with the low noise technique of discrete frequency noise. The prediction model, which allowed the calculation of acoustic pressure at the blade passing frequency and it's harmonics, has been developed by Farrasat. This theory is founded upon the acoustic radiation of unsteady forces acting on blade. To calculate the unsteady resultant force over the fan blade. Time-Marching Free-Wake Method are used. The ideas of low noise technique are obtained from Blade-Momentum Methods. In this paper, the discussion is confined to the performance and discrete noise of axial fan in heavy equipments.

• 한국정보시스템학회지:정보시스템연구
• /
• 제16권2호
• /
• pp.93-122
• /
• 2007

RFID has fundamental influences on today's business management. This research seeks to formulate the opportunities and challenges, the strengths and weaknesses and the perceived benefits of RFID implementation in three industries: manufacturing, medical-service, and distribution. Ten companies of successful RFID deployment in Korea are presented. Field interview and panel discussion were used to explore the research purpose. The core challenges include RFID readability issues, lack of best practices, increasing prime cost, visible ROI, implementation cost, and employee's resistance. The strengths include IT infrastructure, system integration competency, RFID business model creation ability, executive's support. There is little weakness in Korea companies, there are many perceived benefits in three industries. The most distinctive finding is that the visible ROI was found out in the manufacturing industry, not in the distribution industry. The opportunities and challenges, the strengths and weaknesses and the perceived benefits are some different in three industries, which provide valuable guidance for Korean companies in seeking the RFID opportunities. This case study represents a pioneer research of RFID adoption in Korea.

• 보건의료산업학회지
• /
• 제8권1호
• /
• pp.135-150
• /
• 2014

The purpose of this study was to identify the effects of nursing simulation-based practice education on learning outcome and teaching experience in nursing students. Pretest-posttest design with nonequivalent control group was utilized to analyze the effects of nursing simulation-based practice education. The subjects were 96 students of a nursing college. All subjects participated in 6 week. The data were analyzed by the SPSS win 17.0 program. The results were as follows; There were statistically significant differences in learning outcome and teaching experience effects of nursing simulation-based practice education in nursing students. In conclusion, we required nursing simulation-based practice education and small group discussion analysis of factors are associated with goal-setting skills and self-presentation skills, goal setting skills. We required nursing simulation-based practice education training to strengthen the ability of self-directed learning program utilizing the repeated study.

• 아동학회지
• /
• 제23권6호
• /
• pp.139-152
• /
• 2002

The test for the identification of verbally gifted children was administered to 323 gifted and average primary school children. Listening, reading, writing were analyzed by statistical methods, and speaking was videotaped for analysis of the interview and discussion process. Cronbach's ${\alpha}$ confirmed reliability of the test. There were significant correlations between item scores and total scores. Concurrent validity was indicated by correlations between total scores and language arts scores. The test showed differences between the gifted and average children in reading and writing scores for the 2nd and the 3rd graders, and in listening and reading scores for the 4th, 5th, and 6th graders. Analysis of speaking ability showed that the gifted children expressed their ideas more logically and creatively than the average children.

• Nuclear Engineering and Technology
• /
• 제37권2호
• /
• pp.151-158
• /
• 2005

Advanced nuclear power plants are generally large complex systems automated by computers. Whenever a rare plant emergency occurs the plant operators must cope with the emergency under severe mental stress without committing any fatal errors. Furthermore, The operators must train to improve and maintain their ability to cope with every conceivable situation, though it is almost impossible to be fully prepared for an infinite variety of situations. In view of the limited capability of operators in emergency situations, there has been a new approach to preventing the human error caused by improper human-machine interaction. The new approach has been triggered by the introduction of advanced information systems that help operators recognize and counteract plant emergencies. In this paper, the adverse effect of automation in human-machine systems is explained. The discussion then focuses on how to configure a joint human-machine system for ideal human-machine interaction. Finally, there is a new proposal on how to organize technologies that recognize the different states of such a joint human-machine system.

• 수산해양교육연구
• /
• 제28권5호
• /
• pp.1517-1527
• /
• 2016

The purpose of this study was to investigate the effectiveness of integrated education research conducted in Korea and to propose a meaningful discussion for further research. Among the studies conducted for last five years, the relevant 69 research articles were selected, and 211 effect sizes were calculated. Effect sizes were analyzed with different dependent variables including creativity, problem solving ability, inquiry skills, scientific recognition, attitude, interest, motivation and self-esteem. In addition, effect sizes with different moderating variable, such as samples sizes, characteristics of subjects, class types, core disciplines were compared. The conclusions of this study was that STEAM education had a relatively middle effect size. Finally, researchers discussed the results related with previous results, and provided the implications and suggestion for future studies.

• 한국수학교육학회지시리즈D:수학교육연구
• /
• 제11권4호
• /
• pp.265-274
• /
• 2007

The middle school mathematics teachers of the countryside in western China have little chance to further their education and strengthen their research abilities. In this program, we should offer them chance to learn new educational ideas and teaching methods. There will be demonstration lectures and video teaching of course standards followed by group discussion and personalized instructions. These activities prepare the teachers to give their own demonstration lectures. This again is followed by additional personalized instructions. The teachers come to the program with very limited knowledge of these techniques but will leave with the ability to write educational scientific research papers.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2000년도 추계학술대회논문집
• /
• pp.106-112
• /
• 2000

Axial fans are widely used in heavy machines due to their ability to produce high flow rate for cooling of engines. At the same time. the noise generated by these fans causes one of the most serious problems. This work is concerned with the low noise technique of discrete frequency noise. The prediction model. which allowed the calculation of acoustic pressure at the blade passing frequency and it's harmonics. has been developed by Farrasat. This theory is founded upon the acoustic radiation of unsteady forces acting on blade. To calculate the unsteady resultant force over the fan blade. Time-Marching Free-Wake Method are used. The fan noise of fan system having unsymmetric engine-room is predicted. In this paper, the discussion is confined to the performance and discrete noise of axial fan and front part of engine room in heavy equipments.

• 한국문헌정보학회지
• /
• 제37권2호
• /
• pp.303-318
• /
• 2003

독서부진 즉 읽기를 통한 학습 부진의 요인은 신체적요인, 인지적 요인, 정의적 요인, 환경적 요인으로 볼 수 있다. 본 연구는 초등고학년을 대상으로 그들의 특징, 그들이 갖고 있는 스트레스, 독서지도 전략을 제시하였다. 그리고 학업성취도는 높으나 읽기부진으로 정독하지 못하고 자아중심적인 초등고학년 아동을 위한 독서치료 사례를 제시하였다.

• Communications for Statistical Applications and Methods
• /
• 제28권2호
• /
• pp.171-188
• /
• 2021

Due to an increased demand for longevity risk analysis, various stochastic models have been suggested to evaluate uncertainly in estimated life expectancy and the associated value of future annuity payments. Recently updated data allow us to analyze mortality for a longer historical period and extended age ranges. This study followed up previous case studies using up-to-date empirical data on Korean mortality and the recently developed R package StMoMo for stochastic mortality models analysis. The suitability of stochastic mortality models, focusing on retirement ages, was investigated with goodness-of-fit, validity of models, and ability of generating reasonable sets of simulation paths of future mortality. Comparisons were made across various types of models. Based on the selected models, the variability of important estimated measures associated with pension, annuity, and reverse mortgage were quantified using simulations.