• Journal of Information Technology Applications and Management
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• 제27권2호
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• pp.23-36
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• 2020

The promulgation of the overall framework of Chinese students' development of core literacy has made the implementation of core literacy into specific teaching activities an urgent problem to be solved in the field of education. Based on the analysis of the problems existing in the undergraduate education under the mode of emphasizing theory and neglecting practice, this paper constructs the practical teaching system of Database Principle Course Based on the core quality, expounds the implementation strategy of practical teaching, and probes into how to train the students in the practical teaching of database principle Cultivate scientific spirit, learning ability, practical innovation, responsibility and other core literacy. After 5 rounds of practice, students have achieved better development in independent development and collaborative work, and their awareness of practical innovation has been significantly improved.

• 한국자기학회지
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• 제15권1호
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• pp.48-52
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• 2005

본 연구는 미래의 가정에 설치되 전자식 전력량계의 정밀 전류측정용 센서 개발에 관한 내용이다. 전류센서는 공심코어 원리를 사용하기 때문에 일반 변류기(current transformer)의 자기포화와 비선형 오차의 한계 영향이 적다. 개발된 센서는 저전류 범위에서 선형도의 개선과 함께 공심코어를 사용하므로 제작이 간단한 장점을 가지고 있다. FEM solver 를 사용하여 자기장 해석을 하였으며 실제 측정된 값과 계산에 의한 값을 비교하였다.

• Smart Structures and Systems
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• 제30권2호
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• pp.121-133
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• 2022

An analytical approach for the free vibration behavior of a sandwich cylindrical shell with a functionally graded (FG) core is presented. It is considered that the FG distribution is in the direction of thickness. The material properties are temperature-dependent. The sandwich cylindrical shell with a FG core is considered with two cases. In the first model, i.e., Ceramic-FGM-Metal (CFM), the interior layer of the cylindrical shell is rich metal while the exterior layer is rich ceramic and the FG material is located between two layers and for the second model i.e., Metal-FGM-Ceramic (MFC), the material distribution is in reverse order. This study develops Carrera's Unified Formulation (CUF) to analyze sandwich cylindrical shell with an FG core for the first time. Considering the Principle of Virtual Displacements (PVDs) according to the CUF, the dependent boundary conditions and governing equations are obtained. The coupled governing equations are derived using Galerkin's method. In order to validate the present results, comparisons are made with the available solutions in the previous researches. The effects of different geometrical and material parameters on the free vibration behavior of a sandwich cylindrical shell with an FG core are examined.

• 기록학연구
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• 제52호
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• pp.59-117
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• 2017

이 연구는 보존기록관리 원칙인 출처주의의 해석과 적용에 관한 담론을 체계적으로 분석함으로써 이론적, 실무적 주장의 근거와 배경을 구조적으로 파악하기 위한 것이다. 이를 위해 첫째, 출처주의 담론 영역을 구분하였다. 유럽의 여러 지역에서 오랫동안 실무적으로 채택되어온 방법론이 네덜란드 매뉴얼을 통해 명문화된 1898년 이후 출처주의 담론의 흐름을 대체로 정립, 확산, 전환, 확장 해체영역으로 나누고 각 영역별로 핵심 담론을 살펴보았다. 둘째, 출처주의 담론 분석에 맞도록 논변 모형을 설계하였다. 툴민의 논변 모형과 던의 정책논변 모형을 참고로 하되 출처주의 담론 분석에 적합한 요소들을 결합하여 모형을 재설계하였다. 셋째, 각 영역의 핵심 담론별로 출처주의에 관한 영어권 저자들의 논문과 저서를 일차적으로 조사하여 선별하고 각 논저에 나타나는 인용논문을 추가하는 방법으로 담론텍스트를 뽑아 그 내용을 분석하였다. 이러한 분석을 토대로 각 영역별로 논변 모형을 제시하였다.

• 디자인학연구
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• 제14권2호
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• pp.235-244
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• 2001

한글은 이미 세계적인 문자로 인정받고 있으나, 정작 그 자랑을 실체적으로 보여줄 글자꼴에서는 체계성이 부족하고, 주체성 없는 변화의 연속이 오히려 시각문화 발전과 국가 정보화의 걸림돌이 되고 있다. 본 논문은 이러한 원인의 핵심이 한글의 창제 정신과 원리를 제대로 이어받지 못하고 있기 때문으로 보고, 이와 같은 전제를 구체적으로 입증하기 위하여 한글을 디자인의 시각으로 바라보고, 그 우수성을 체계적으로 밝히어, 오늘의 문제를 해결하기 위한 근거와 객관성을 제시하고 있다. 연구결과, 한글의 창제철학과 원리는 오늘의 시각으로 보아도 당대의 사회적, 문화적 배경에 적절한 디자인 철학을 품고 있으며, 합리적인 디자인 과정을 거쳤음을 확인하였다. 따라서, 오늘의 한글꼴의 문제는 전제한 바와 같이 창제 정신과 원리를 바탕에 두고 풀어야만 해결의 실마리를 찾을 수 있음을 알 수 있었다. 더 나아가, 한글의 창제는 민족과 국가를 초월한 원활한 의사소통의 한 수단으로 만들어낸, 합리적이고 과학적인 글자 디자인 원리의 창제로도 해석할 수 있다. 그러므로, 한글 창제 과정에서 보여진 디자인 방법과 원리의 탐구는 시각 커뮤니케이션 디자인의 방법론을 새롭게 다지는 기초 자료가 될 뿐만 아니라, 한국 디자인 철학의 뿌리를 찾는 핵심적인 연구 과제라 할 수 있다.

• 경영과학
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• 제34권2호
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• pp.35-56
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• 2017

Technology innovations have been accelerating changes across industries and intensifying competition. Enterprises are therefore required to continuously secure their internal and external competitiveness. Based on the principle that core competencies of a firm are essential to its competitiveness, many research studies have been conducted to figure out the effect of core competencies to business performance. However, individual research works considered a part of core competencies or limited to a specific industry, which means that their findings may differ when additional core competencies are included in their analysis. After re-establishing the definition of each core competency from literature review, this study comprehensively investigated the effect relationship among core competencies and business performance. Structural equation modeling and multiple regression analysis with 421 survey respondents from various industries were conducted for our empirical study.

• Computers and Concrete
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• 제27권4호
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• pp.369-383
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• 2021

This article deals with the frequency analysis of viscoelastic sandwich disk with graphene nano-platelets (GPLs) reinforced viscoelastic concrete (GPLRVC) face sheets and honeycomb core. The honeycomb core is made of aluminum due to its low weight and high stiffness. The rule of the mixture and modified Halpin-Tsai model are engaged to provide the effective material constant of the concrete. By employing Hamilton's principle, the governing equations of the structure are derived and solved with the aid of the Generalize Differential Quadrature Method (GDQM). In this paper, viscoelastic properties are modeled according to Kelvin-Voigt viscoelasticity. The deflection as the function of time can be solved by the fourth-order Runge-Kutta numerical method. Afterward, a parametric study is carried out to investigate the effects of the outer to inner radius ratio, hexagonal core angle, thickness to length ratio of the concrete, the weight fraction of GPLs into concrete, and the thickness of honeycomb core to inner radius ratio on the frequency of the viscoelastic sandwich disk with honeycomb core and FG-GPLRVC face sheet.

• 한국정밀공학회지
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• 제22권10호
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• pp.72-79
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• 2005

Compared with linear induction principle, the transverse flux circumferential induction principle is suggested as a driving mechanism of the revolving stage, which can rotate contactlessly without any supporting structure. The stage realizes the integrated motion of levitation, rotation, and planar perturbation, using the two-axis forces, normally directed force of the air-gap and tangential force, of the induction drivers mounted on the stator uniformly. In this paper, the force generating mechanism of the stage is described in detail. First, the various core shapes generating the transverse flux are analyzed to guarantee the proper thrust force. And the vector force intensity of the circumferential induction driver constituting the stage is compared with that of the linear induction driver. Especially it is shown that the magnetic force of the suggested system can be modeled with the linear equivalent model, including the test verification.

• Journal of Information Technology Applications and Management
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• 제19권4호
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• pp.153-169
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• 2012

In the rapidly changing field of Management Information Systems, the definition and educational programs must be continually reevaluated and revised. A study was conducted to find a way to which the modeling principle is applied for redefining the identity of Management Information Systems as an independent academic field and to develop a plausible MIS curriculum based on the modeling principle. Previous researches on the MIS frameworks, knowledge and technology requirements for IS professionals, and standard MIS curriculums were reviewed thoroughly. For this study, the Kantian cognitive model was adopted as a basis of modeling principle. The result shows that modeling ability has been the core competence of IS people in the field of MIS. The applicability of a modeling principle is also verified in establishing the identity of MIS and developing a normative MIS curriculum. For the MIS field to thrive as an independent academic field and research discipline, it is believed to be imperative for the discipline to have a unique educational goals distinguished from both other management areas, and sub-fields of computer science.

• Steel and Composite Structures
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• 제32권5호
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• pp.595-610
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• 2019

This paper deals with the static and dynamic behavior of Functionally Graded Carbon Nanotubes (FG-CNT)-reinforced porous sandwich (PMPV) polymer plate. The model of nanocomposite plate is investigated within the first order shear deformation theory (FSDT). Two types of porous sandwich plates are supposed (sandwich with face sheets reinforced / homogeneous core and sandwich with homogeneous face sheets / reinforced core). Functionally graded Carbon Nanotubes (FG-CNT) and uniformly Carbon Nanotubes (UD-CNT) distributions of face sheets or core porous plates with uniaxially aligned single-walled carbon nanotubes are considered. The governing equations are derived by using Hamilton's principle. The solution for bending and vibration of such type's porous plates are obtained. The detailed mathematical derivations are provided and the solutions are compared to some cases in the literature. The effect of the several parameters of reinforced sandwich porous plates such as aspect ratios, volume fraction, types of reinforcement, number of modes and thickness of plate on the bending and vibration analyses are studied and discussed. On the question of porosity, this study found that there is a great influence of their variation on the static and vibration of porous sandwich plate.