• The Journal of the Korea Contents Association
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• v.21 no.7
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• pp.477-487
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• 2021

Alternative education in Korea has grown into an educational movement since the 1990s. The alternative education is affecting and growing the public education system such as innovative schools, free semester systems, and high school credit systems. In 2021, an institutional foundation was also established to be recognized and supported as an educational institution. As a result of reflecting on the alternative education movement for 20 years, it is understood as stagnant lost time in the second half of the decade. It is discussing reorganizing the meaning of future-oriented "alternatives" with the new "alternatives". The poverty of educational philosophy has also been highlighted as an issue, but no special discussions have been underway. Thus, the study discussed to propose an educational philosophy that could capture the ideologies of alternative education. Critical pedagogy aims to foster human beings who are subjective, autonomous, active and self-reliant through conscious emancipation. In recent years, critical pedagogy have discussed ecological environment and feminism. The educational philosophy of scholars such as Freire and Illich was the basis of the early alternative educational movement. Considering this, the study discusses that Korea's alternative education movement can be understood through critical education and is reasonable as an educational philosophy for new alternatives in the future.

• Journal of applied mathematics & informatics
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• v.7 no.2
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• pp.493-506
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• 2000

Recently the first author and his coworker report a new finite element method for the Poisson equations with homogeneous Dirichlet boundary conditions on a polygonal domain with one re-entrant angle [7], They use the well-known fact that the solution of such problem has a singular representation, deduced a well-posed new variational problem for a regular part of solution and an extraction formula for the so-called stress intensity factor using tow cut-off functions. They use Fredholm alternative an Garding's inequality to establish the well-posedness of the variational problem and finite element approximation, so there is a maximum bound for mesh h theoretically. although the numerical experiments shows the convergence for every reasonable h with reasonable size y imposing a restriction to the support of the extra cut-off function without using Garding's inequality. We also give error analysis with similar results.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.32 no.4
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• pp.63-71
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• 2009

The traditional portfolio optimization problem is to find an investment plan for securities with reasonable trade-off between the rate of return and the risk. The seminal work in this field is the mean-variance model by Markowitz, which is a quadratic programming problem. Since it is now computationally practical to solve the model, a number of alternative models to overcome this complexity have been proposed. In this paper, among the alternatives, we focus on the Mean Absolute Deviation (MAD) model. More specifically, we developed an algorithm to obtain an optimal portfolio from the MAD model. We showed mathematically that the algorithm can solve the problem to optimality. We tested it using the real data from the Korean Stock Market. The results coincide with our expectation that the method can solve a variety of problems in a reasonable computational time.

• Proceedings of the KIEE Conference
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• 2004.11b
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• pp.119-121
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• 2004

This paper presents a methodology which can make alternatives of distribution system, and can calculate reliability costs, harmonics costs, and construction costs. And by using total cost of the system, decision maker can select the most economic and reasonable alternative. As a result, not only we can decide most economical and reasonable result, but we can get proper reliability and harmonics level. The usefulness of the method is verified by applying it to the test system.

• Clinics in Shoulder and Elbow
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• v.1 no.1
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• pp.72-77
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• 1998

We treated 5 elbows with post-traumatic flexion contractures (mean contracture: 51 degrees) by arthroscopic anterior capsular release and post-operative alternative flexion and extension splint. Each elbow had been resistant to at least six months of conservative therapy. An incongruent ulno-humeral articulation was considered to be a contraindication to this procedure. All patients complained of the residual deformity and some functional deficit. All patients, after failure of non-operative therapy, desired a operative treatment. At follow-up(mean 21.8 months), there was a mean post-operative contracture of 19 degrees, which is within a functional range of motion. So we conclude that arthroscopic capsular release in selected patients is reasonable alternative to open release.

• Journal of the Korea Construction Safety Engineering Association
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• s.52
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• pp.58-66
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• 2011

This study presents an algorithm to select the best alternative plane among various bridge superstructure types (Steel box girder, Rational girder, PSC-I girder) using Value Engineering (VE). Economical efficiency, landscape, constructability, maintenance, stability, function of bridge superstructure were taken into consideration in the designing of bridge. Economical efficiency was evaluated for each alternative plan with optimal design considering Life Cycle Cost (LCC), Repair and rehabilitation histories and some factors were set to get reasonable results. In the application of Analytic Hierarchy Process (AHP), consistency of Pairwise Comparisons Matrix was evaluated and the best plan was determined.

• 한국연소학회:학술대회논문집
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• 2006.04a
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• pp.121-127
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• 2006

It has become inevitable to search for alternative fuels due to severe energy crisis these days. Use of alternative fuels, which are typically of lower quality, tends to increase environmental pollution, including formation of nitrogen oxides (NOx). In this paper performance of vacuum residue has been investigated experimentally as well as numerically in typical operating conditions of a furnace. Heat release reaction is modeled as sequential steps of devolatilization, simplified gas phase reaction and char oxidation as that for pulverized coal. Thermal and fuel NOx are predicted by conditional estimation of elementary reaction rates and are compared against measured experimental data. On the overall reasonable agreement is achieved for spatial distributions of major species, temperature and NOx for all test cases.

• Journal of the Korean Society of Safety
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• v.24 no.6
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• pp.79-85
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• 2009

This study presents an algorithm to select the best alternative plane among various bridge superstructure types(Steel box girder, Rational girder, PSC-I girder) using Value Engineering(VE). Economical efficiency, landscape, constructability, maintenance, stability, function of bridge superstructure were taken into consideration in the designing of bridge. Economical efficiency was evaluated for each alternative plan with optimal design considering Life Cycle Cost(LCC). Repair and rehabilitation histories and some factors were set to get reasonable results. In the application of Analytic Hierarchy Process(AHP), consistency of Pairwise Comparisons Matrix was evaluated and the best plan was determined.

• Steel and Composite Structures
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• v.27 no.2
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• pp.177-184
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• 2018

This study contributes to evaluate multiphase topology optimization design of plate-like structures on elastic foundations by using classic plate theory. Multi-material optimal topology and shape are produced as an alternative to provide reasonable material assignments based on stress distributions. Multi-material topology optimization problem is solved through an alternative active-phase algorithm with Gauss-Seidel version as an optimization model of optimality criteria. Stiffness and adjoint sensitivity formulations linked to thin plate potential strain energy are derived in terms of multiphase design variables and Winkler-Pasternak parameters considering elastic foundation to apply to the current topology optimization. Numerical examples verify efficiency and diversity of the present topology optimization method of elastic thin plates depending on multiple materials and Winkler-Pasternak parameters with the same amount of volume fraction and total structural volume.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2003.10a
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• pp.11-11
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• 2003

Electroplated hexavalent chromium coatings have been used in many technical applications since it was invented by G.J. Sargent in 1920. Because of the environmental problems and health risks associated with the use of hexavalent chromium, there has been an extensive search for alternative coatings with properties such as corrosion resistance and wear resistance, at a reasonable cost. However there is no single substitute that meets all the desirable performance characteristics of chromium. Advanced techniques, such as alloy plating, electroless plating, trivalent chromium plating, plasma and thermal spray coating, PVD and ion implantation, have been applied for replacing hexavalent chromium plating.