• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.26 no.7
• /
• pp.39-44
• /
• 2012

This paper deals with the characteristic analysis of small power brushless DC (BLDC) motor considering the rotor magnet overhang flux. In the driving characteristics analysis using 2D FEA (Finite Element Analysis), the rotor magnet overhang effect can't be considered and it should be neglected. To consider rotor magnet overhang effect, 3D FEA should be required. But 3D FEA requires very long calculation time even though the high specification computer is used. In this paper, the 3D electromagnetic model of BLDC motor is approximated as the 2D electromagnetic model considering overhang effect. In this paper, the concept of overhang coefficient is applied, and the coefficient according to load torque variance is deduced.

• Journal of Korean Society of Archives and Records Management
• /
• v.11 no.2
• /
• pp.165-188
• /
• 2011

This paper suggests the methods of curriculum-standards analysis and collection analysis. This paper also designs the sample of archival contents for education based on this methods. This paper intends to verify the methods and to suggest a model of archival contents for education available in connection with the curriculum-standards by designing the archival contents for education on national unification in high school classrooms.

• Journal of the Korean Institute of Rural Architecture
• /
• v.16 no.4
• /
• pp.59-66
• /
• 2014

This paper deals with vibration of plates with concentrated mass on elastic foundation. The object of investigating natural frequencies of tapered thick plate on pasternak foundation by means of finite element method and providing kinetic design data for mat of building structures. Free vibration analysis that tapered thick plate in this paper. Finite element analysis of rectangular plate is done by use of rectangular finite element with 8-nodes. In order to analysis plate which is supported on pasternak foundation. The Winkler parameter is varied with 10, $10^2$, $10^3$ and the shear foundation parameter is 5, 10. This paper is analyzed varying thickness by taper ratio. The taper ratio is applied as 0.0, 0.25, 0.5, 0.75, 1.0. And the Concentrated Mass is applied as P1, Pc, P2 respectively.

• Proceedings of the KSR Conference
• /
• 1998.11a
• /
• pp.305-312
• /
• 1998

A formulation to perform static equilibrium and linear vibration analysis is presented in this paper. The formulation employs minimum number of equations of motion which are derived by using a partial velocity matrix, The static equilibrium analysis is performed first, then the linear vibration analysis is performed at the static equilibrium position. By using the formulation presented in this paper, static equilibrium and linear vibration analysis of a high speed electric train system are performed. A single bogie system, a power vehicle, and a train system which consists of five vehicles are analyzed, respectively. Natural frequencies and a few lowest mode shapes of the three are identified in this paper.

• East Asian Journal of Business Economics (EAJBE)
• /
• v.8 no.4
• /
• pp.45-65
• /
• 2020

Purpose - This paper is to analyze the system and the models of financial analysis in the assessment of economic consistency and the creditability of borrower. To test the process of complex express-analysis, it is utilized by the concentric matrix models by using the matrix of 5×5.. Research design, data, and methodology - The estimation of economic consistency, the creditworthiness, the complex express-analysis with application of concentric matrix models were carried out on the basis of data of the report for the 2017 of corporations POSCO and in the first half of the 2018 Daewoo Shipbuilding & Marine Engineering of South Korea. Results - This paper focused on the unbalance of the corporate financial structure (capital, receivable) and the assessment of sustainability development, taking into account the liquidity, solvency, financial sustainability and economic viability of the enterprise. Conclusions - this paper also consider the theoretical means of regulating receivables. The material is presented in the pedagogical context and appendix of the conclusion.

• International Journal of High-Rise Buildings
• /
• v.12 no.1
• /
• pp.83-91
• /
• 2023

Under the dual pressure of population growth and land shortage, threedimensional development is the inevitable choice for cities in China. In such a scenario, a mixed-use complex has considerable potential in its realization and research. Based on space syntax and the three-dimensional visibility graph analysis, this paper describes the spatial and functional layout of the Shanghai Super Brand Mall and studies the relationship between spatial visibility and user behaviour through linear regression analysis and correlation analysis. This paper studies three different types of user behaviour, namely, path selection, staying selection, and store selection, and finds that spatial visibility and accessibility have different effects on user behaviour depending on the type and purpose of the activity. This paper reveals the influence of spatial and functional layout on user behaviour and puts forward the corresponding design strategy under the three-dimensional environment.

• Journal of Engineering Education Research
• /
• v.7 no.3
• /
• pp.5-18
• /
• 2004

This paper, as a continuation of 'Job Analysis for developing Vocational Education & Training Program' executed from 1998, is aimed at complementing a guidebook for job analysis developed in 2002 to improve its usage in the areas of education, training and qualification, and at making and distributing basic data to develop curriculum for vocational education, standards for vocational training, and guidelines for making questions in qualification examination for 10 kinds of vocations through job analysis, which were precedently selected, for the purpose, out of environment industry-related vocations drawn from carried out together with this project by our Institute in 2003. The contents of this paper are first, to analyze what have precedently been done for job analysis, second, to complement a guidebook for job analysis, third, to select vocations for which job analysis will be made, and fourth, to carry out job analysis for developing curriculum for vocational education and training and guidelines for making questions and to distribute comprehensive data made on a basis of the results. Paper methods for the purpose of this paper are an analysis on literatures and data related to job analysis, experts councils for complementing job analysis, selecting target vocations and conducting job analysis by the vocations, and job analysis applying DACUM method. In the first place, this report presents job analysis models by procedures for developing curriculum for vocational education and training. The first step is preparation for job analysis, the second step the establishment of job models, the third step the drawn-out of knowledge, skills, and tools, the fourth step the selection of courses and subjects, the fifth step the specification of education and training contents, and the sixth the establishment of guidelines for making questions. In this paper, job analysis for 10 vocations were conducted in accordance with these procedures.

• Journal of Korea Technical Association of The Pulp and Paper Industry
• /
• v.42 no.5
• /
• pp.67-73
• /
• 2010

Paper packaging materials are essential in protection and transportation of commercial or industrial products. Raw materials for packaging paper production are mainly obtained from various grades of waste paper. For this reason, the recycled fibers from waste paper would probably have possibility of containing heavy metals. This study was focused on the development of optimum pre-treatment method for the quantitative analysis of mercury. The optimum pre-treatment for open digestion system were obtained at the treatment conditions of acid combination with $HNO_3/HCl/H_2O_2$ or $HNO_3/H_2SO_4$ at $80^{\circ}C$. The optimum pre-treatment conditions in closed digestion system were determinated by the acid combination with $HNO_3/HCl/H_2O_2/HF$ in microwave at 320 W for 20 min. The recovery rate in open digestion system was 85~94% and in closed digestion system was indicated as about 100%. Therefore, the closed system is superior than the open system in pre-treatment method for the quantitative analysis of mercury, and the detected mercury contents in the sample of KOCC, AOCC and kraft sack paper were measured below 1 ppm.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.20 no.42
• /
• pp.1-8
• /
• 1997

In case of analysis of discrete data, it shows by way of example orthogonal array experiment for o, 1 data. This paper introduced expirical logit transformation and the type of Freeman-Tukey inverse sine transformation. As the result of analysis of variance, empirical logit transformation turned out a mistake in application but it is possible for graphical analysis by normal probability paper.

• Proceedings of the Korean Geotechical Society Conference
• /
• 1999.10a
• /
• pp.365-370
• /
• 1999

In this paper, dynamic response analysis on the ground movement applied traffic load by 2D finite element procedure has been studied. In particular, The paper deal with pointing acceleration method that applied AFIMEX Code as like 2D-FLUSH using equivalent linear method. As the result, it is found that dynamic response analysis by pointing acceleration method expressed ground movement by traffic load exactly.