• 실천공학교육논문지
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• 제11권1호
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• pp.61-73
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• 2019

국내 평생직업능력개발 체계는 국가직무능력표준(NCS: National Competency Standards)을 중심으로 변화를 추진 중이다. NCS 중심의 직업훈련 체계가 성공적으로 정착하고 제 기능을 발휘하기 위해서는 고등교육의 중심인 4년제 대학에도 잘 적용되어야 한다. 그러나 4년제 대학의 경우 교과과정의 현장성 부재 문제가 지속적으로 제기되어 있고, 새롭게 출범한 대학연계형 일학습병행제 계약학과는 NCS기반의 자격을 교육과정의 중심에 두고 운영하도록 되어 있으나, 한국 기업의 현실을 고려한 표준모델의 부재로 인해 대학들이 신규 가입을 주저하고 있는 실정이다. 본 논문에서는 현재 운영 중인 코리아텍 일학습병행대학을 연구대상으로 하여 NCS기반 자격과 연계된 한국형 일학습병행대학의 표준모델을 개발하고, 이를 코리아텍 일학습병행대학 내 "기계설계공학과"에 실제 적용한 사례를 보인다. 또한 NCS기반 일학습병행대학 표준모델의 성공적 확산에 요구되는 다양한 시행방안을 관련 법 제도의 틀 안에서 도출하여 제시한다. 이러한 결과는 한국형 일학습병행대학의 확산을 촉진하고, 대학 및 기업의 참여동기를 제고하며, 궁극적으로는 NCS기반 일학습병행대학들이 평생직업능력개발의 한 축을 담당하는 데 크게 기여할 것으로 기대된다.

• 실천공학교육논문지
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• 제13권3호
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• pp.507-514
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• 2021

본 연구에서는 K대학교 공과대학에서 학위 연계형 일학습병행제 학습근로자들에게 최초로 학위를 수여한 2020년 2월 졸업자를 대상으로 이루어진 조별 졸업 작품 제작과 그 결과를 공학 논문 체계로 완성하는 단계까지 진행한 과정을 제시하고, 대상자들에게서 얻어진 39개 항목의 설문조사 결과를 같은 학년도 졸업자인 같은 전공의 전일제 학생들의 결과들과 비교 분석하였다. 5개 대표 응답 문항을 집단별로 구분하여 통계 분석을 시도하였으나, 각 집단별 인원이 30명 미만으로 응답 결과의 정규성 검정 및 모수적 방법에 의한 통계 분석이 제한되었다. 그러나 가능한 일표본 t-검정을 중심으로 작품 주제 변경 횟수와 조원간 만족도, 작품 지도에 관련된 응답 항목에서 5점 척도 기준 집단간 평균 0.8점 이상 차이가 남을 확인하였고, 이에 대한 대처 방안을 제시하였다.

• Journal of Power Electronics
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• 제15권2호
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• pp.327-337
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• 2015

This study discusses the design of a parallel-operated DC-DC single-ended primary-inductor converter (SEPIC) for low-voltage application and current sharing with a constant output voltage. A coupled inductor is used for parallel-connected SEPIC topology. Generally, two separate inductors require different ripple currents, but a coupled inductor has the advantage of using the same ripple current. Furthermore, tightly coupled inductors require only half of the ripple current that separate inductors use. In this proposed work, tightly coupled inductors are used. These produce an output that is more efficient than that from separate inductors. Two SEPICs are also connected in parallel using the coupled inductors with a single common controller. An analog control circuit is designed to generate pulse width modulation (PWM) signals and to fulfill the closed-loop control function. A stable output current-sharing strategy is proposed in this system. An experimental setup is developed for a 18.5 V, 60 W parallel SEPIC (PSEPIC) converter, and the results are verified. Results indicate that the PSEPIC provides good response for the variation of input voltage and sudden change in load.

• 실천공학교육논문지
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• 제11권1호
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• pp.51-59
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• 2019

대학연계형 일학습병행제를 운영하는 계약학과 입장에서 NCS기반자격과 과정평가형 자격 모두를 수용할 수 있는 교과 편성이 가능한가에 대한 연구로 두 자격 간 주요내용과 차이점을 비교 분석한다. 기계설계 직무중에서 과정평가형 자격으로 공고된 기계설계기사 사례 분석을 통하여 양측 자격의 편성 기준에 부합하는 교과과정을 개발하였고 향후 운영상의 문제점을 예측하고 극복방안을 제시한다. 또한 일학습병행제와 과정평가형을 연계하여 운영하는 전문 교육기관으로 공급자 중심의 교육훈련과 수요자 중심 기술 자격의 격차를 최소화하고 학습근로자의 학업 성과를 극대화 하기 위한 현장주도 교육과정 편성이 용이하도록 몇가지 방안을 제안한다.

• International Journal of Advanced Culture Technology
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• 제10권4호
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• pp.245-254
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• 2022

This study is a study to empirically verify the mediating effect on college life adaptation and career preparation behavior of college students. The purpose of this study is to empirically analyze the multi-mediated effects of major satisfaction, job stress, and self-directed learning. For this study, 216 university students were enrolled. For the collected data, SPSS Process macro was used. The result is as follows. First, there were multiple parallel mediating effects and multiple serial mediating effects on major satisfaction, job stress, and self-directed learning between college life adaptability and career preparation behavior. Second, the path of simple mediation and double mediation effect was found between college life adaptation and career preparation behavior. Based on the research, the necessity of revitalizing the program for revitalization of teaching activities and industry-academic cooperation activities in the major field and improvement of career preparation behavior and university life adaptation ability and follow-up research were suggested.

• 설비공학논문집
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• 제18권9호
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• pp.753-760
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• 2006

The purpose of the present work is to investigate the influence of the refrigerant adulteration by LiBr solution on the cooling capacity and COP for three different types of abso게tion chillers: a single-effect type, a series-flow double-effect type and a parallel-flow with double-effect type. A simulation program has been prepared for the cyclic analysis of absorption chillers. With some assumptions, the calculations have been performed by solving the mass balance equation, energy balance equation and the state equation simultaneously. The range of the LiBr concentration of refrigerant was 0% to 20% in the present study. For the single-effect absorption chiller, the maximum decrease in the cooling capacity was 10% at the 20% of LiBr concentration. For the double-effect chiller, the capacity was decreased by 11.1% for the parallel-flow type and the series-flow type. Also, the COP was reduced by 3.0% in single-effect, 2.8% in series-flow type (SR=0.4) and 2.3% in parallel-flow type.

• Safety and Health at Work
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• 제13권3호
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• pp.286-293
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• 2022

Background: The death rate of workers due to industrial accidents in South Korea (3.61 persons in 2017) is higher than the Organization for Economic Cooperation and Development average (2.43) and the fifth highest among Organization for Economic Cooperation and Development member countries. Although the pandemic of novel coronavirus (COVID-19) has changed, the socioeconomic aspects of Korean society, the number of Koreans suffering accidents and the number of deaths in 2020 have increased. It is necessary to take measures to prevent accidents and make comprehensive efforts to return to work. This study proposes research questions about the effect of workers' positive perception on whether to work after accidents and the impact of the experience of rehabilitation services on the return to work. Methods: This research performed a panel logistic regression analysis using data on workers' compensation insurance in Korea for two years (2018-2019). Results: This research finds that workers' positive perceptions of workability and life satisfaction contributed affirmatively to their re-employment. Several factors related to employment (e.g., work period, the number of job qualifications) also positively affect their return to work. However, the experience of rehabilitation services did not have a significant effect on re-employment. The variables of their health conditions (e.g., disability grade, feelings of health problems, age) negatively influenced their return to jobs. Conclusion: These results suggest the importance of workers' mental recovery and the need to innovate rehabilitation services for their employment. Positive thinking and self-rehabilitation could be critical for workers, parallel with social welfare policies.

• International Journal of Reliability and Applications
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• 제14권1호
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• pp.11-26
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• 2013

The availability equivalence factors of a general repairable series-parallel system is discussed in this paper based on the availability function of the system. The system components are assumed to be repairable and independent but not identical. The life and repair times of the system components are exponentially distributed with different parameters. Two types of availability equivalent factors of the system are derived. The results derived in this paper generalizes those given in the literature. A case study is introduced to illustrate how the idea of this work can be applied.

• Human Ecology Research
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• 제58권3호
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• pp.333-341
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• 2020

This study examined the trajectories of the marital satisfaction among middle and old aged couples for 8 years. This study focused on middle and old aged couples who were relatively uninterested in family research. Using the 1-5 Waves of Korean Longitudinal Study of Ageing (KLoSA) 2006-2014, the study included 635 middle and old aged couples whose husbands were 65-74 years old at baseline. First, a latent growth model indicated that a husband's and wife's marital satisfaction trajectories decreased over time. Second, a parallel latent growth model indicated that a husband's marital satisfaction trajectories decreased more quickly, when the initial level of their own marital satisfaction was higher (husband's actor-effect); in addition, a wife's marital satisfaction trajectories also decreased more quickly, when the initial level of their own marital satisfaction was higher (wife's actor-effect). Wife's marital satisfaction trajectories decreased more slowly, when the initial level of their husband's marital satisfaction was higher (husband's partner-effect); however, the husband's slope was not associated with the initial level of their wife's. The methodological value of this work shows the application of a parallel latent growth model that includes the actor and partner effect of APIM. The findings extend our understanding of longitudinal marital dynamics between couples and promote a study on the trajectories of marital satisfaction at stages of the family life cycle.

• Smart Structures and Systems
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• 제11권1호
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• pp.35-51
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• 2013

Over the last two decades Wavelet Transformation (WT) method has been widely utilized for the damage identification of structures. The main objective of this paper is to discuss and present some of common shortcomings and limitations of mathematical software, as well as other precautionary measures that need to be considered when using them for wavelet analysis applications. Due to popular usage of MATLABMATLAB(R) comparing to other mathematical tools among researchers for data processing of structural responses through WT analysis, this software was chosen for specific study. To the best of the authors' knowledge, these limitations and observations have not been previously identified or discussed in the literature. In this work, a square plate with a severe damage, in form of a crack, parallel to the left edge of the plate is selected for a pilot study. The steady state harmonic response is used for measuring the deflection shape across the line parallel to one edge and perpendicular to the damage. Several criteria and cases such as the smallest size damage that can be detected, correlation between the crack width and the number of sampling points, and the influence of the damage thickness on the accuracy of the result are investigated.