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입학전형집단별 특성비교 및 사관생도 입교서열과 누적서열 간 상관비교
이용철(Lee, Yongchol) 해군사관학교 해양연구소 2017 海洋硏究論叢 Vol.49 No.-
본 연구에서는 2014년부터 시행되고 있는 특별전형이 본래의 목적을 달성하고 있는지를 살펴보기 위하여 2014 ~ 2017년까지 해사에 지원하고 입교한 사관생도 510명을 대상으로 입학전형(특별전형과 일반전형)에 따 른 입교 및 자퇴율, 성취점, 그리고 성취점 구성요인에 어떤 차이가 있는지와 입학서열과 학과서열 간 상관이 없 다는 암묵적 통념이 옳은지를 살펴보았다. 전형집단별 입학률은 특별전형집단이 일반전형집단에 비하여 높았으 나, 입교 후 자퇴율에서는 두 집단 간 차이를 확인하지 못하였다. 입학시험 성적을 기준으로 전형집단 간 학습수 준에 차이가 있는지를 비교한 결과에서는 두 집단 간 유의한 차이가 없었던 반면, 입교 후 각 학기별 성취점을 비교한 결과에서는 특별전형집단이 일반전형집단에 비해 우수한 것으로 나타났으며, 전형별 10분위 누적 그래 프에서도 학년이 올라 갈수록 상위 1/2에 속하는 비율이 더욱 높은 것을 발견하였다. 성취점 구성요인에서는 학 과요인과 훈육요인이 특별전형집단에서 높게 나타났으나, 체육요인은 두 집단 간에 차이가 없는 것으로 나타났 다. 전형에 관계없이 입학시험성적과 학과성적과의 상관분석에서는 입학시험 성적과 학과성적은 통계적 상관이 없는 것으로 나타났으나 1학년 1학기 성적은 이후 학과성적 및 누적서열에 보통이상의 상관이 있는 것으로 나타 났다. 향후 특별전형 집단과 일반전형 집단의 성취도 차이는 어디에서 기인하는지와 현재의 전형집단별 차이가 졸업은 물론 군 생활을 통해서도 다른 차이를 보이는지에 관한 종단연구 그리고 입교 시 상위권 집단 및 1학년 1학기 학과성취도가 낮은 집단에 대한 동기부여 방안 등 다양한 연구가 병행 추진되어야 한다.
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해군사관학교 성취점 구성요소가 누적성취점에 미치는 영향력 분석
이용철(Lee, Yongchol) 해군사관학교 해양연구소 2019 海洋硏究論叢 Vol.52 No.-
Multiple regression analysis using the order of achievement points was conducted to examine the influences in each field constituting cumulative achievement points and the following are the results. The achievement points of each year had the same impact as the percentage of each year’s achievement points to cumulative achievement points, but this result revealed that the achievement motivations for the Midshipmen should be improved. Among the components, the influence of the discipline field showed about 14% less than the percentage of the achievement points of that field on the cumulative achievement points. The reason for this is that many midshipmen are tied compared to other fields, so it is necessary to increase discrimination in the evaluation of that filed. The fact that the influence of the aptitude element is 7.5% more than other elements that make up the discipline field should be revealed through more detailed research.
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해군사관학교 입시생의 전형집단, 성별에 따른 진학포기율과 재교생의 퇴교율 및 성취수준 분석
이용철(Lee, Yongchol) 해군사관학교 해양연구소 2019 海洋硏究論叢 Vol.52 No.-
Based on the entrance examination data for the past 5 years, I analyzed the admission-abandonment rate, the drop-out ratio, and academic achievement level according to the admission types and gender. The analysis showed that the school principal’s recommendation group showed the lowest admission- abandonment rate and the regular admission group showed the highest admission- abandonment rate. However, there was no difference in the drop-out ratio between the admission groups. Both admission- abandonment rate and drop-out ratio were not different according to gender. Based on the entrance exam, the regular admission group’s academic achievement level was same or lower than the other groups, but I could not find such difference between groups according to the academic achievement-points which midshipmen earned as the results of their academic activities. Even though, the school principal’s recommendation group showed statically significant difference in academic achievement level compared to that of the regular admission group, however, the difference was not caused by a big difference in a specific field which consists the academic achievement points but by accumulating small differences in each field.
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잠수함 난류항적 기술을 위한 무차원 난류 에너지 분포함수 B(ξ) 예측
이용철,Lee, YongChol 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.1
To describe turbulent wake behind a submarine, it is very important to know turbulent kinetic energy distributions in the wake. To get the distribution is to solve the turbulent kinetic energy equation, and to solve the equation, it is needed both information of ${\lambda}$ and ${\sigma}$ which define physical characteristics of the wake. This paper gives analytical solution of the equation, which is driven from $8^{th}$ order polynomial fitting, as a function of given ${\lambda}$, even though there is no information of ${\sigma}$. In comparison between numerical solution(i.e. exact solution) and analytical solution, the relative errors between them are less than to 5% in the range of 0 < ${\xi}$ < 0.95 in most given ${\lambda}$.
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민승식(Seungsik Min),이용철(Yongchol Lee) 한국해군과학기술학회 2024 Journal of the KNST Vol.7 No.1
In this paper, the stability of the anchor was judged through the case study of the dragging anchor, and a plan to strengthen the holding force was suggested. The existing formula was improved to derive the holding force strictly. And the holding force coefficient of the iron sinker and the concrete sinker attached to the mooring buoy was calculated through the measurement of the lifting force of it. Based on this, alternatives were suggested to estimate the holding force of the buoy and secure the stability of the sinker.
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파주력 및 외력 분석을 통한 묘박 중인 선체의 안정성 고찰
민승식(Seungsik Min),노익제(Ikjae Noh),이용철(Yongchol Lee) 한국해군과학기술학회 2024 Journal of the KNST Vol.7 No.1
In this paper, the stability of the headstone was estimated through the analysis of the physical relationship between the external force and the field force in the situation of the headstone of a barge-type vessel. The relationship between the wind pressure by wind, hydraulic force by ocean current, and drift force by waves, which are the main external forces acting on ships, was examined, and the external force acting on the ship was estimated according to the strength during typhoon invasion. In addition, the stability of the headstone of a barge-type ship was estimated by applying the field force according to the weight and depth of the anchor.
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황인혁(Inhyuck Hwang),민승식(Seungsik Min),김소연(So Yeon Kim),이용철(Yongchol Lee) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.4
In this paper, related case studies and requirements for building a smart classroom were collected and performed relative weight calculations using AHP. In addition, quality function deployment was used to expand requirements into functions and calculate the relative weight for each function. Through this, key functional elements for building a smart classroom were identified and priorities for development were determined.
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