• Journal of the Korean Society for Nondestructive Testing
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• v.32 no.4
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• pp.431-438
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• 2012

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2002.03a
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• pp.341-348
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• 2002

This manuscript introduces the Building Standard Law of Japan revised at 2000, June. Recently, The Building Standard Law of Japan was revised into the performance-based design format following the trend of international. The structural performance was evaluated for two limiting states; serviceability and soundness limit state, and safety limit state. The design earthquake forces were determined on the basis of seismic activities of the construction site, taking into consideration (a)characteristics of focal mechanism, (b)amplification by local surfaces geology, and (c)soil-structure interaction, in addition to the properties of the planned building including scale, configuration, foundation system, and structural characteristics.

• Journal of the Korean Society for Nondestructive Testing
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• v.31 no.6
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• pp.635-641
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• 2011

In ultrasonic testing of dissimilar metal welds, application of phased array technique in terms of incident beam focusing is not easy because of complicated material structures formed during the multi-pass welding process. Time reversal(TR) techniques can overcome some limitations of phased array since they are self-focusing that does not depend on the geometrical and physical properties of testing components. In this paper, we test the possibility of TR focusing on a defect within anisotropic, heterogeneous austenitic welds. A commercial simulation software is employed for TR focusing and imaging of a side-drilled hole. The performance of time reversed adaptive focal law is compared with those of calculated focal laws for both anisotropic and isotropic welds.

• Journal of the Korean Society for Nondestructive Testing
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• v.28 no.5
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• pp.427-435
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• 2008

Inspection of dissimilar metal welds using phased array ultrasound is not easy at all, because crystalline structure of dissimilar metal welds cause deviation and splitting of the ultrasonic beams. Thus, in order to have focusing and/or steering phased array beams in dissimilar metal welds, proper time delays should be determined by ray tracing. In this paper, we proposed an effective approach to solve this difficult problem. Specifically, we modify the Oglivy's model parameters to describe the crystalline structure of real dissimilar metal welds in a fabricated specimen. And then, we calculate the proper time delay and incident angle of linear phased array transducer in the anisotropic and inhomogeneous material for focusing and/or steering phased array ultrasonic beams on the desired position.

• Korean Journal of Optics and Photonics
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• v.26 no.6
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• pp.299-305
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• 2015

Using Snell's Law without approximation, we analyzed focal points for parallel rays incident upon the cornea of a human eye. To calculate a ray's incident angle versus incident height for focusing on the same point, we used the ray reverse tracing method. We derived the theoretical conditions for an aspherical lens to remove the spherical aberration caused by a human eye. In this research, we held the rear surface of the lens to be spherical, for simple calculation, and calculated the lens curvature of the front surface to design an aspherical surface.

• Management & Information Systems Review
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• v.26
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• pp.261-291
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• 2008

The EU holds about 50% of exports and imports in the world trade of services. The insurance markets have undergone a significant consolidation in solvency rule, cross-border registration, and standardized accounts. In the EU-Korea FTA negotiations the EU is interested in mutual certification of qualifications as well as market liberalization of law, finance and distribution and so forth. When the negotiation with respect to the mutual certification of qualifications comes to a settlement, the two countries will drive it in service areas. Korea should examine european certification regulations and improve domestic insurance-related institutions. France is the focal country of the EU. The paper provides a comparative study of insurance markets and agents in France and Korea. The paper argues that Korea should initiate institutional changes and be transformed into an insurance service exporting country for the specialized insurance agents to move to EU countries.

• Korean Journal of Optics and Photonics
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• v.4 no.4
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• pp.390-396
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• 1993

When a one-dimensional telecentric paraxial holographic kinoform is used as a Fourier transform lens, we analyzed three surface-relief structures, i.e., plano-convex, convex-plano and biconvex shapes, employing exact raytracing method based on Snell's law. For the kinoform of E/8 and focal length of 15 mm, the number of zones, the thickness, and the slope of parabolic surfaces are varied by changing the refractive indicies of kinoform material and surrounding medium. It is found that biconvex shape gives the best results in general, although off-axis performance degrades in all cases as the slope of parabolic surfaces increases.

• Asian Oncology Nursing
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• v.4 no.2
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• pp.143-153
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• 2004

Death of spouse is the most heartbreaking stressful and inevitable tragic life event. In middle aged men who belong to the social middle class and accomplished their occupational success, experiences of spousal bereavement are great shock. The aim of this study was to find out how they overcome their mental and physical pain and to obtain the basic materials to develop suitable nursing care programs for them. The methodological approach of this study is Giorgi's phenomenological analysis meaning unit. This method also makes theme focal meaning, situated structural description and create general structural description grasped by participator's experience through situated structure description. This study performed from November 2002 to May 2004, and participators were four men. Data collected through in-depth personal interviews. which had been tapped and analysed the Giorgi's method. Finally, the five focal meaning below have been abstracted. Theme 1. Physical symptom loss of appetite, fatigue, insomnia. outbreak of illness, weight loss. Theme 2. life of spiritless lack of desire, sense of emptiness, unstableness, prosaic life. wandering. indifference of appearances, avoidance of meeting people. Theme 3. life of retrospction reflection for his wife, yearning, grief, muttering to himself, never-to-be forgotten wife, leading a lonely life. Theme 4. negative emotion reproaching, feeling hurt, marriage of daughter, feeling heavy, getting angry, sexual desire, awareness of his sinfulness. loneliness Theme 5. social support and adjustment getting his wife off his mind, curring favor with children, support and consolation by his daughter-in-law, appreciation for hospice nurse, considering remarriage, taking care of himself, good relation with his children. The result of this study showed that middle aged men bereaved of their wife by cancer need other's concern. And we have to study further to understand their experience. Until now hospice nursing is concentrated on cancer patients But from now we have to provide their families suitable nursing care programs to adjust themselves to social life before and after death of patients.

• Nuclear Engineering and Technology
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• v.53 no.6
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• pp.1846-1857
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• 2021

Ultrasonic nondestructive testing is important for monitoring the structural integrity of dissimilar metal welds (DMWs) in pressure vessels and piping in nuclear power plants. However, there is a low probability of crack detection via inspection of DMWs using ultrasonic waves because the grain structures (grain orientations) of the weld area cause distortion and splitting of ultrasonic beams propagating in anisotropic media. To overcome this issue, the grain orientation should be known, and a precise ultrasonic wave simulation technique in anisotropic media is required to model the distortion and splitting of the waves accurately. In this study, a method for nondestructive prediction of the DMW grain orientations is presented for accurate simulation of ultrasonic wave propagation behavior in the weld area. The ultrasonic wave propagation behavior in anisotropic media is simulated via finite-element analysis when ultrasonic waves propagate in a transversely isotropic material. In addition, a methodology to predict the DMW grain orientation is proposed that employs a simulation technique for ultrasonic wave propagation behavior calculation and an optimization technique. The simulated ultrasonic wave behaviors with the grain orientations predicted via the proposed method demonstrate its usefulness. Moreover, the method can be used to determine the focal law in DMWs.

• Korean Journal of Social Welfare
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• v.56 no.1
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• pp.5-22
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• 2004

The notion of independence is currently a focal point in public discourses in relation to the elderly. In most countries, the promotion of independence, not the alleviation of dependence, has been addressed as a priority goal in the formulation of social policies for the elderly and the term of independence is used in policy documents as if it were unproblematic. In most cases, policy documents do not offer a clear definition of independence, but generally the term is interpreted as self-sufficiency and health. Accordingly, in order to promote independence of the elderly, concrete strategies such as employment, social activities, participation, direct payments are being introduced in many advanced countries. This study critically reviews these discourses and strategies, and attempts at developing an understanding of how independence and dependence is constructed in contemporary social policies for the elderly. It is our critical point that we explores the meaning of the independence and dependence from the perspective of the elderly. Findings of this study are as follows: The elderly participated in this study tended to construct the meaning of 'independence' as privacy, self-esteem, autonomy and freedom. They also tended to perceive and interpret, from their perspective, the 'dependence' as a natural law and process, affection among human beings, reward and fruit of their lives, social justice and social responsibility. In this sense current policies for the elderly have not fully reflected the perspective of the elderly. Therefore, it is argued what is important in policy formulations for the elderly is to make efforts to reflect the perspective of the elderly on policy-makings for the elderly in terms of independence and dependence.