• Geomechanics and Engineering
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• 제31권2호
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• pp.183-195
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• 2022

Under the effects of the near-field earthquakes, the incident angle of the incoming wave could be different. In this study, the influences of some parameters such as incident angle, basin edge, peak ground acceleration level of the bedrock motion as well as different clay types with different consistency on the amplification behavior of the shallow basins are investigated. To attain this goal, the numerical analyses of the basins filled with three different clay types are performed using a fully nonlinear method. The two dimensional models of the basins are subjected to a set of strong ground motions with different peak ground acceleration levels and three different incident angles of 30◦, 45◦ and 90◦ with respect to the horizontal axes. The results show the dominant effect of the obliquely subjected waves at most cases. The higher effect of the 45◦ incident angle on the basin response was concluded. In the other part of this study, the spectral amplification curves of the surface points were compared. It was seen that the maximum spectral amplification of different surface points occurs at different periods. Also, it is affected by the increase in the peak acceleration level of the incoming motions.

• Computers and Concrete
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• 제32권6호
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• pp.553-565
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• 2023

This work is the first to apply nonlocal theory and a variety of deformation plate theories to study the issue of forced vibration and buckling in organic nanoplates, where the effect of the drag parameter inside the structure has been taken into consideration. Whereas previous research on nanostructures has treated the nonlocal parameter as a fixed value, this study accounts for its effect, and finds that its value fluctuates with the thickness of each layer. This is also a new point that no works have mentioned for organic plates. On the foundation of the notion of potential movement, the equilibrium equation is derived, the buckling issue is handled using Navier's solution, and the forced oscillation problem is solved using the finite element approach. Additionally, a set of numerical examples exhibiting the forced vibration and buckling response of organic nanoplates are shown. These findings indicate that the nonlocal parameter and the drag parameter of the structure have a substantial effect on the mechanical responses of organic nanoplates.

• 한국학교수학회논문집
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• 제5권1호
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• pp.135-145
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• 2002

Technical high school aims at educating students to acquire fundamental skill and technology required for being competent technicians, to be creative in adjusting themselves to the changing industrial society, and to do self-realization and find their ways toward the future on their own. To attain that goal and maximize learning effect, mathematics education is very important as prerequisite learning for technical subjects, as most technical courses in technical high school are basically based on mathematics. The purpose of this study was to discuss how mathematics education could be successfully linked to technical courses in an attempt to make it function properly as prerequisite learning for major subjects and facilitate students' technical learning. For that purpose, what problems the mathematics components of major subjects and the curriculum had was examined and the way to offer better education was presented. And there are some suggestions regarding mathematics education: First, technical mathematics should be newly inserted into technical high school curricula to help students learn major subjects in more efficient way. Second, most technical high schools are expected to just require tenth graders to complete a 10-stage mathematics course. In that case, they might find difficulties in learning major subjects when they are in their 11st and 12th grade. The curriculum should be designed to have 11st and 12th graders take mathematics education. Third, many students find a job after graduation, but the growing number of students go on to university to receive more education in the same field. Accordingly, there is a need to enlarge continuous progress plan, rather than completion-type one, to make students well-grounded technically. And mathematics should be taught in more classes as prerequisite subject for major courses. Fourth, mathematics elements necessary for each major subject should be outlined and announced to schools so that they could reorganize mathematics and major courses appropriately.

• 대한공업교육학회지
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• 제41권1호
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• pp.44-67
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• 2016

이 연구의 목적은 공업계 고등학생들의 회복탄력성, 전공만족도, 취업준비도간의 구조적 관계를 구명하는 것이다. 이 연구의 대상은 공업계 고등학생이며, 440명의 공업계 고등학생들을 조사대상으로 선정하였다. 조사도구로는 설문지를 활용하였으며, 회수된 409부 중 불성실 응답을 제외한 391부를 분석에 활용하였다. 이 연구의 결과는 다음과 같았다. 첫째, 공업계 고등학생들의 회복탄력성은 높았으며, 영역별로는 흥미와 관심의 다양성이 가장 높았으며, 감정조절이 상대적으로 가장 낮았다. 그리고 공업계 고등학생들의 일반 특성에 따른 차이를 알아본 결과 마이스터고 학생이 특성화고 학생보다, 남학생이 여학생보다, 교과성적이 높은 학생이 회복탄력성이 더 높았다. 둘째, 공업계 고등학생들의 전공만족도는 보통이었으며, 영역별로는 전공 전망이 가장 높았으며, 사회차원 만족이 상대적으로 가장 낮았다. 그리고 공업계 마이스터고 학생이 특성화고 학생보다, 남학생이 여학생보다, 교과성적이 높은 학생이 전공만족도가 더 높았다. 셋째, 공업계 고등학생들의 취업준비도는 보통이었으며, 하위 영역 중 취업태도가 매우 높았으며, 직무수행능력과 취업정보는 보통이었다. 그리고 공업계 마이스터고 학생이 특성화고 학생보다, 남학생이 여학생보다, 교과성적이 높은 학생이 취업준비도가 더 높았다. 넷째, 공업계 고등학생들의 회복탄력성은 직접적으로 학생들의 취업준비도에 영향을 미칠뿐 아니라 전공만족도를 매개로 하여 취업준비도에 영향을 주었다. 그리고 다중집단분석을 통하여 공업계 고등학생들의 회복탄력성과 전공만족도, 취업준비도의 관계는 마이스터고와 특성화고 모두에 적용되는 모형임이 확인되었다.

• Journal of Welding and Joining
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• 제28권1호
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• pp.47-53
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• 2010

In recent time there is vigorous requirement for the use of thick steel plate in various industrial fields including shipbuilding industry. Especially, with the continual increases in marine transportation volumes on a global scale, the steel of container ships has become thicker and thicker with the increased size of ships. In addition, the brittle crack arrestability of heavy thick plates was big issue, in recently. In this study, crack arrest test were conducted in order to investigate the crack arrestability of thick plates for shipbuilding steels, where test plate thicknesses were 50mm and 80mm. This paper introduces the brittle crack arrestability of heavy thick plates with thickness effect for shipbuilding.

• 한국정보통신학회논문지
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• 제19권6호
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• pp.1277-1282
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• 2015

본 논문은 국가직무능력표준(NCS)기반 국가기술자격검정의 정보처리분야 실기시험 평가방법 개선을 목적으로 수행된 연구에 대한 내용을 기술한 것이다. 현행 정보처리분야의 실기시험의 내용을 체계적으로 분석한 후 최신 정보기술 동향을 반영하고 국가직무능력표준의 능력단위, 수행준거 등을 접목하여 정보기술 분야 실기시험의 새로운 평가방법을 제시하였고, 시범평가를 통해 그 효과를 검증하였다. 향후 한국산업인력공단 기술자격출제실에서는 본 연구를 기초로 세부직무분야 전문가를 통한 출제 기준 개정을 완료 한 후 정보처리분야 국가기술자격검정에 실제 적용할 예정이다.

• 한국디지털정책학회:학술대회논문집
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• 한국디지털정책학회 2006년도 추계학술대회
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• pp.19-41
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• 2006

The purpose of this paper is to suggest field-oriented policy of regional innovation support system. To accomplish this purpose, we examined the status quo of technical support ,performance satisfaction of consumers and practical issues. The key factors influencing core technical innovation of small and medium firms are development fund, R&D employees, experimental instrument, technical information, protection of intellectual property, subcontracting and so on. To make sure of practical effect, therefore, it would rather necessary to implement policy support linking government and supporting means on the ground of needs of small and medium firms than specific method such as funding.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.614-621
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• 2004

Blasting is a technique for rock excavation: For instance, a rock cutting in a mountain side to prepare a base for a road. The blasting damage affect the rock slope stability. Therefore control blasting must be used. In this study, cutting cases of Sixty-nine rock blasts were investigated. Blasting damage patterns in rock slope and reinforcement methods are studied.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.695-696
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• 2008

This paper deals with the reduction of DC component of cogging toruqe by using the heat treatment of the stator core. The stator core is made of electrical steel sheared by the punching die. From the punching process, large mechanical stress at the edge of stator tooth induces significant plastic and elastic deformation and influences magnetic properties. Then, these phenomenon in the sheared region has influence on the magnetic unbalance in the air-gap of motor. This paper investigated the effect of the punching process on the magnetization process and the mechanical deformation and proposed the stress relief annealing method for the reduction of friction torque among one of motor characteristics.

• Structural Engineering and Mechanics
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• 제47권6호
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• pp.857-879
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• 2013

Numerical damage assessment of Van train station building consisting of three RC blocks due to 2011 Van Earthquakes by nonlinear dynamic analysis is presented. The structural model is created with rigid-end offsets and plastic hinges for nonlinear analysis. Rigid-end offsets are considered for connection areas and proposed for wall-supported elements. In wall-supported elements, walls take place in a limited part of the columns. Nonlinear dynamic analysis of the building with and without rigid-end offsets is performed by using real earthquake records and results are compared. The results show that rigid-end offsets have significant effects on the seismic behavior of the structures.