• Journal of the Korean Society for Nondestructive Testing
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• v.20 no.3
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• pp.213-220
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• 2000

The method of photoelasticity allows one to obtain principal stress differences and principal stress directions in a photoelastic model. In the classical approach, the photoelastic parameters are measured manually point by point. The previous methods require much time and skill in the identification and measurement of photoelastic data. Fringe phase shifting method has been recently developed and widely used to measure and analyze fringe data in photo-mechanics. This paper presents the test results of photoelastic fringe phase shifting technique for the stress analysis of a circular disk under compression and an edge-cracked plate subjected to tensile load. The technique used here requires four phase stepped photoelastic images obtained from a circular polariscope by rotating the analyzer at $0^{\circ}$, $45^{\circ}$, $90^{\circ}$ and $135^{\circ}$. Experimental results are compared with those or FEM. Good agreement between the results can be observed. However, some error may be included if the technique is used to general direction which is not parallel to isoclinic fringe.

• The Korean Society of Law and Medicine
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• v.18 no.1
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• pp.3-35
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• 2017

The Supreme Court of Korea first admitted compensation for damages caused by breach of informed consent in 1979. From then on, specific details of informed consent are shaping up and developing through court precedents. The duty of informed consent of doctor is based on article 10 of the Constitution and medical contract, and is expressly prescribed Article 12 of Framework Act on Health and Medical Services and other acts and regulations. By the way, the regulations about duty of informed consent of doctor have been established in Medical Law revised on December 20, 2016, and the revised Medical Law will be implemented on June 21, 2017. According to the revised Medical Law, medical practices subject to description and consent are operation, blood transfusion and general anesthesia that threaten to cause serious harm to human life or to the body. When performing these medical activities, the written consent must be explained and agreed upon in advance. If a doctor violates the law, he will incur fines of less than 3 million won. Comparing and viewing the revised Medical Law and existing legal principles about the duty of informed consent, we can confirm that there is a substantial difference between the two parties. Accordingly, despite the implementation of the revised medical law, the existing legal principles are unlikely to be affected. However, from the perspective of legal uniformity and stability, it is undesirable that legal judgments on the same issues differ from each other. The revised Medical Law about informed consent needs to be reformed according to existing legal principles. And, as in the case of Germany, it is desirable to include the matters concerning informed consent in the civil code.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.1
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• pp.97-105
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• 2015

Multiresponse optimization (MRO) seeks to find the setting of input variables, which optimizes the multiple responses simultaneously. The approach of weighted mean squared error (WMSE) minimization for MRO imposes a different weight on the squared bias and variance, which are the two components of the mean squared error (MSE). To date, a weighted sum-based method has been proposed for WMSE minimization. On the other hand, this method has a limitation in that it cannot find the most preferred solution located in a nonconvex region in objective function space. This paper proposes a Tchebycheff metric-based method to overcome the limitations of the weighted sum-based method.

• The Transactions of the Korea Information Processing Society
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• v.6 no.4
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• pp.833-841
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• 1999

The texts constructed with Optical Character Recognition(OCR) contain more errors than those constructed with keyboard typing. Therefore, in order to retrieve useful information from OCR texts, we need to develop an effective automatic indexing method. In this paer, we investigate automatic indexing methods that can retrieve information effectively from Korean OCR text database with the character-level recognition ratio of 90%. Experimental result shows that 2-gram indexing provides similar retrieval effectiveness of morpheme-based indexing for the Korean OCR text database.

• Journal of Korean Library and Information Science Society
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• v.48 no.2
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• pp.1-21
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• 2017

According to the library act, the regional central library is not only a public library but also a library representing the metropolitan municipalities in Korea. But the status and role of current representative libraries are so weak that they are nothing more than large public libraries. Focusing on realistic vulnerability, this study analyzed the major weaknesses and limitations of regional central libraries and suggested ways to normalize legal positions and operations in terms of revising and supplementing the library act, restructuring and strengthening the tasks to be performed, and expanding the manpower and operating organization directly connected with core competencies.

• Nuclear Engineering and Technology
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• v.25 no.2
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• pp.259-264
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• 1993

Ion chromatographic method has been applied for burnup measurement of irradiated nuclear fuel by dynamic system using 1-octanesulfonate as a cation exchanger and $\alpha$-hydroxyisobutyric acid as an eluant. A number of elution techniques were evaluated for the optimum separation of plutonium, uranium and neodymium. These elements were individually separated and collected by gradient elution between 0.05 M and 0.40 M of $\alpha$-hydroxyisobutyric acid in a single column, and finally determined by isotope dilution mass spectrometry. The burnup data from this method were compared with those from conventional anion exchange method. The results showed a good agreement within 3.5 % of difference between two methods.

• Transactions of the Korean Society of Mechanical Engineers
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• v.9 no.1
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• pp.10-17
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• 1985

A new method is suggested for the solution of plane elasticity problems. With use of the dislocation model in the crack problems, the basic scheme of this method is to find equilibrium Burgers vectors of dislocations which are distributed along the boundary of the first fundamental boundary value problems. The stress distribution in the region can be found by superposition of the contributions of each dislocation. The method is applied to three cases with known analytical solutions, and to a V-notched specimen under uniaxial tension. The numerical results are compared with other available solutions. This method is effective and simple in its use, compared with other numerical methods. The method also provides very accurate solutions in the region except near the boundary where the discretization error is significant. The extrapolation method is suggested for the stresses in the boundary region. Extensive application are also suggested for a general estimate of the computational efficiency of the method.

• Tunnel and Underground Space
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• v.25 no.1
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• pp.68-75
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• 2015

Rock mass includes such discontinuities as fault, joint, bedding, crack, schistosity, cleavage. The rock mass behavior, therefore, is influenced by the discontinuity behavior. In this study, a stability and deformation analysis method considering discontinuities in rock mass is proposed, and then applied to the rock collapse disaster site. As the method, the stability analysis by the stereographic projection method was carried out in an actual site, the deformation analysis program by the finite element method including the joint element was developed, and performed. To demonstrate the applicability of this developed stability and deformation analysis method considering discontinuities in rock mass, the analysis results are examined and compared with the failure behavior at the rock mass.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.32 no.5
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• pp.307-321
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• 2020

The design and the construction are carried out by installation of new caissons on the back or the front of old caissons to increase the stability of old caisson breakwater. In this study, we use the eigenfunction expansion method to analyze the effects of wave structure interaction when new circular caissons are installed on the back or the front of old caissons. The comparison of numerical results between present method and Williams and Li is made, and the wave force and the wave run-up acting on each circular caisson are calculated for various parameters by considering the wave structure interaction.

• Journal of the Korea Society of Computer and Information
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• v.16 no.8
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• pp.157-164
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• 2011

As a computer technology is combined with communication technology, information and communication technology developed rapidly. As a result, The number of internet users increased quickly. Ability of human in using information was epoch-making, and it was increased through the Internet on behalf of an information-oriented society. As an Internet user hereby spreads explosively, legislations were established and revised to protect Internet users and consumers however, it is certain that the damages of Internet users are still increasing day by day. The purpose of this paper is to protect internet users and to reform the system. Also each portal site should provide fair information, and be responsible for conclusion of a contract. After they subdivide into personal service style, and analyze every situation and problems, they should improve problems.