초등학생의 자기주도학습을 위한 LMS 활용방안

이주성,전석주,Lee, Ju-Sung,Chun, Seok-Ju 한국정보교육학회 2019 정보교육학회논문지 Vol.23 No.2

최근에는 ICT기술을 학습에 도입한 학습관리시스템이 학생들의 자기주도 학습능력을 향상시키는데 도움을 주고 있다. 학습관리시스템을 활용한 자기주도 학습은 학습자원의 효율적인 활용과 의사소통 확산의 장점을 중심으로 학습자의 학습참여를 촉진시키고 흥미를 유발시켜준다. 본 연구에서는 학습관리시스템을 활용한 자기주도 학습이 초등학생의 학습동기와 학업성취취도에 미치는 영향에 대해 알아보았다. 학습자들은 제안한 학습관리시스템의 알고리즘을 통해 자신의 수준에 맞는 문제를 학습하므로 효과적인 학업 성취를 달성할 수 있을 것이다. 연구를 위하여 S초등학교 21명에 대한 제안한 학습관리시스템을 활용한 수업을 8주 동안 매주 2차시씩 총 16차 시를 진행하였다. 연구결과로 실험에 참여한 학습자의 학습지향성과 흥미 영역에 유의미한 향상을 보였다. Recently, a learning management system incorporating ICT technology into learning has helped students improve self-directed learning skills. Self-directed learning using LMS promotes and stimulates learners' participation in learning, focusing on the advantages of efficient use of learning resources and the spread of communication. In this study, we study the impact of self-directed learning using the learning management system on elementary school students' motivation and academic performance. We expect learners will be able to achieve effective academic achievement by learning problems that fit their level through the algorithms of the proposed learning management system. For this study, a total of 16 classes were conducted for eight weeks using the proposed learning management system for 21 elementary school students. Research has shown significant improvement in the learning orientation and interest areas of the learners who participated in the experiment.

공대교육의 획기적 발전방안 - 학문영역의 다변화 추구해야

이주성,Lee, Ju-Seong 한국과학기술단체총연합회 1992 과학과 기술 Vol.25 No.3

고유변형률 기반 등가하중법을 이용한 판의 용접변형 해석

이주성,Lee, Joo-Sung 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.2

IIn this study, used is the equivalent loading method based on the inherent strain to predict the welding deformation of panel members. Equivalent loads are computed from the inherent strain distribution around weld line, and then applied for the linear finite element analysis. Thermal deformation of panel members can be, of course, carried out through the rigorous thermal elasto-plastic analysis procedure but it is not practical in applying to predicting the welding deformation of large structures such as blocks found in a ship structure from view of computing time. The present equivalent load approach has been applied to flat plate model to verify the present approach, and to several curved plate models having the curvature in the welding direction to investigate the effect of the longitudinal curvature upon the weld-induced deformation. The results are compared with those by thermal elasto-plastic analysis. As far as the present results are concerned, it can be said that the present approach shows good agreement with the results by welding experiment and the rigorous thermal elasto-plastic analysis. The present approach has been also applied to predict the welding deformation of panel block as for application illustration to practical model.

신뢰성 해석에 기초한 선체 중앙단면 설계

이주성,Lee, Joo-Sung 한국전산구조공학회 2011 한국전산구조공학회논문집 Vol.24 No.5

본 논문에서는 종굽힘 최종강도에 대한 선체 중앙단면 구조의 구조신뢰성 해석과 이에 기초한 설계를 다루었다. 길이 100m이상인 8척의 산적화물운반선과 7척의 탱커를 본 연구의 대상 모델로 선정하였다. 본 대상 선박 모델들에 대한 구조 신뢰성 해석결과를 토대로 목표신뢰성 지수를 도출하였다. 두 선종의 중앙단면 설계시 목표신뢰성 지수를 만족할 수 있는 설계공식을 제안하였고, 이를 본 연구대상 선박 모델들의 재설계에 적용하여 그 타당성을 보였다. 이러한 결과로부터 구조 신뢰성 해석에 기초하여 개발한 설계공식에 의한 설계결과는 보다 균일한 수준의 안전성을 제공할 수 있었다. This study is concerned with the reliability analysis and its based design of midship section against the ultimate bending strength. Eight bulk carriers and seven oil tankers over 100m length are chosen for the present study. Target reliability indices for the two ship types have been derived based on the results reliability analysis of the present ship models. Reliability-based structural design codes are proposed for use in design of midship section of bulk carriers and oil tankers. The design codes proposed in this study have been successfully applied to re-design of midship section of the present ship types. It has been found that the proposed codes can provide more uniform structural design results.

유체기구를 이용한 유압계통의 충격치제어에 수탄되는 반응지연에 관한 연구

이주성,이계복,Lee, Joo-Seong,Lee, Kye-Bock 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11

The response time represents how fast a system responds to a given disturbance at the system boundary. Flow restricting devices for controlling transients can result in a decrease in the peakm pressure, but may change response time. Response lag in a hydraulic system leads to inefficient working cycle and operator discomfort. The experiments were conducted in order to get information on the parameters which exert appreciable influence on the response time. The experimental apparatu including a hydraulic actuator, orifice and a hydraulic pump was an idealization of a bucket hydraulic shifting system. Experimental results show that the response time depends on operating pressure and flow rate. The effects of orifice type and size on the response time are quantified.

고 에너지 밀링 공정으로 제조된 지르콘 나노분말의 소결특성에 관한 연구

이주성,강종봉,Lee, Ju Seong,Kang, Jong Bong 한국재료학회 2016 한국재료학회지 Vol.26 No.2

In this study, 5 um sized $ZrSiO_4$ was ground to 1.9 um, 0.3 um, and 0.1 um sized powders by wet high energy milling process, and the sintering characteristics were observed. Pure $ZrSiO_4$ itself can-not be sintered to these levels of theoretical density, but it was possible to sinter $ZrSiO_4$ powder of nano-scale size of, -0.1 um to the theoretical density and to lower the sintering temperature for full density. Also, the decomposition of $ZrSiO_4$ with a size in the micron range resulted in the formation of monoclinic $ZrO_2$; however, in the nano sized range, the decomposition resulted in the tetragonal phase of $ZrO_2$. So, it was possible to improve the sintering characteristics of nano-sized $ZrSiO_4$ powders.

비대면 강의 운영 전략: 온라인 창업수업을 중심으로

이주성,Lee, Joosung 한국공학교육학회 2022 공학교육연구 Vol.25 No.5

Distance learning has become an efficient tool and is being widely used at work and in school. This research presents the results of a project-oriented entrepreneurship course taught both in classroom and online for a period of 3 years before and after the pandemic caused by COVID-19. Despite the various challenges, the outcome demonstrated that the students were able to attain required knowledge and capabilities in the online learning environment. As such, this paper discusses effective ways to blend in distance learning components so that both instructors and students can benefit from Internet-based education technologies. In the future, both face-to-face and virtual project work and study are likely to get integrated into a 'hyflex' class, which is flexible, on-offline education.

목포항 해안가 경관조명 - 가작 : 중부전기전자㈜ -

이주성,Lee, Ju-Seong 한국조명전기설비학회 2007 조명.전기설비 Vol.21 No.1

오리피스를 이용한 유압 액추에이터의 충격치 제어특성에 관한 실험적 연구

이주성,이계복,Lee, Ju-Seong,Lee, Gye-Bok 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.11

Control of shock may be important in the hydraulic system and necessary to avoid failure and to improve the efficiency of operation. This study addresses the design and use of an orifice to provide the desired control of the hydraulic actuator system. The experimental apparatus is an idealization of an automobile shift system. Control is accomplished by installing three different types of orifices at appropriate locations in the system. Experimental results show that the orifice can be used to obtain the control of shock and control level depends on the orifice size, orifice type, operating pressure and flow rate.

열성형 판 부재의 동적거동에 관련된 재료상수 산출에 관한 연구

이주성,임형균,Lee, Joo-Sung,Lim, Hyung-Kyun 한국전산구조공학회 2016 한국전산구조공학회논문집 Vol.29 No.2

구조물에 충격하중이 작용하면, 그 구조물은 통상적으로 대변형을 동반하는 소성변형과 최종적으로 그에 따른 파단을 경험하게 된다. 본 연구에서는 사고적 극한 상태에 대한 합리적인 설계를 위해 열성형된 판과 냉간성형된 판의 재료상수를 고속인장시험에 대한 수치시현을 통해 정의하였다. 변형율이 중간 속도 이하인 경우에는 변형율 속도의 영향을 무시할 수 있다는 가정과 함께 Cower-Symond 모델과 John-Cook 모델에 포함되는 재료상수들의 유용성을 참고문헌들의 결과와 비교하여 입증하였다. 본 논문은 향후 연구 내용에 대한 언급을 포함하면서 마무리하였다. When impact load is applied to a plate structure, a common phenomenon that occurs in structures is plastic deformation accompanied by a large strain and eventually it will experience a fracture accordingly. In this study, for the rational design against accidental limit state, the plastic material constants of steel plate which is formed by line heating and by cold bending procedure have been defined through the numerical simulation for the high speed tension test. The usefulness of the material constants included in Cowper-Symonds model and Johnson-Cook model with the assumption that strain rate can be neglected when strain rate is less than the intermediate speed is verified through comparing the present numerical results with those in references. This paper ends with describing the future study.