• Journal of the Daesoon Academy of Sciences
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• v.19
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• pp.213-250
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• 2005

Until 1970's, mankind have not had definite perspectives on what life after the death was like, which is one of the most important problems for them. Their concepts of the 'life and death problem' has been distorted by the dogmas of the established religions such as Buddhism or Christianity on heaven and hell. But the mankind came to have wholly different views on the life after death thanks to the studies by Raymond Moody Jr. or Elizabeth Quebler-Ross in the mid-1970's. This is the studies on the so-called 'near-death experience(NDE)' which made humankind be able to have scientific approach to the life after death for the first time in their history. What attracts our attention at this point is, however, that the arguements of the NDErs on humman destiny accurately coincide with those of the established religions. In the NDE, most of the experiencers have an encounter with the personal being, symbolized by the Light, through whom they learnt that the devotion(or love) to the neighborhood and the gain of the wisdom are the sole meaning of life. With this result, we can recognize why essential virtues maintained by the established religions until now such as ultimate compassion, unconditional love, forgiveness, or insightful learning are so significant, and that our studies of the NDE are very important in this respect.

• Korean Journal of Biological Psychiatry
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• v.20 no.2
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• pp.45-53
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• 2013

Objectives Non-major depression with fewer symptoms than required for a Diagnostic and Statistical Manual of Mental Disorders-4th edition diagnosis of major depressive disorder (MDD) has consistently been found to be associated with functional impairment. In this study, we aim to estimate the cognitive impairment and the quality of life in elderly patients with subsyndromal depression (SSD) compared with non-depressive elderly (NDE). Methods The Korean version of Mini International Neuropsychiatric Interview was administered to 194 outpatients with depression and 108 normal controls. SSD is defined as having five or more current depressive symptoms with core depressive symptoms (depressive mood or loss of interest or pleasure) during more than half a day and more than seven days over two weeks. Depression was evaluated by the Korean form of Geriatric Depression Scale of a 15-item short version. Global cognition was assessed by Mini-Mental State Examination in the Korean version of CERAD assessment packet (MMSE-KC). Subjective cognitive impairment was assessed by the Subjective Memory Complaint Questionnaire. Quality of life was evaluated by the Korean Version of Short-Form 36-Item Health Survey. Results The mean score of the MMSE-KC in the SSD group was lower than that in the NDE group with adjustment for age, gender, and education [F = 4.270, p = 0.04, analysis of covariance (ANCOVA)]. If we defined those having Z-score of MMSE-KC < -1.5 as a high risk group of cognitive impairment, the odds ratio for the high risk group of cognitive impairment was 1.86 [95% confidence intervals (CI) 1.04-3.34] in SSD and 7.57 (95% CI 3.50-16.40) in MDD compared to NDE. The scores of physical component summary (F = 9.274, p = 0.003, ANCOVA) and mental component summary (F = 53.166, p < 0.001, ANCOVA) in the SSD group were lower than those in the NDE group with adjustment for age, gender, and education. Conclusions The subjects with SSD, as well as those with MDD, showed impairment of global cognition and also experienced low quality of life in both physical and mental aspects, compared to the NDE group.

• Journal of the Korean Society for Nondestructive Testing
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• v.20 no.5
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• pp.412-423
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• 2000

By using the relation between stress intensity factor and AE parameter, new approach method for assessing the crack length and detectability of crack was proposed. Laboratory experiment was carried out to identify AE characteristics of fatigue cracks for compact tension specimen. The relationship between a stress intensity factor and AE signals activity as well as conventional AE parameter analysis was discussed. As a result, the features of specific parameter such as the length of crack growth the AE energy, the AE peak amplitude, and the cumulative AE hits, showed the almost same trend in their increase as the number of fatigue cycle increased. From the comparisons of peak amplitude and AE energy with stress intensity factor, it was verified that the higher stress intensity factors generated AE signals with higher peak amplitude and a larger number of AE counts. If we can get more reliable database for the relation between AE parameters and stress intensity factor, this approach will provide a good information for evaluating both the existence of crack and the minimum detectable size of crack.

• Nuclear industry
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• v.3 no.4 s.14
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• pp.34-38
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• 1983

• Journal of the Korean Society for Heat Treatment
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• v.14 no.1
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• pp.22-26
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• 2001

The microstructural changes with pearlite formation heat treatment in eutectoid steel(railway steel) consisting of only pearlite structure were evaluated by the ultrasonic attenuation and velocity measurements. The result of this investigation showed a strong linear dependence of ultrasonic attenuation on pearlite interlamellar spacing, and accordingly on fracture strength of the pearlite.

• Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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• v.9
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• pp.65-87
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• 2004

Im $gegew\"{a}rtigen$ Deutschen gibt es zwei verschiedene Auffassungen $\"{u}ber$ das adjektivische Wortbildungsmorphem -Ios. $W\"{a}hrend$ -Ios einerseits als Halbsuffix betrachtet wird, will man es andererseits als Suffix betrachten. Die $Gr\"{u}nde$, die -Ios als Halbsuffix gelten lassen, sind die folgenden : 1. Es besteht eine semantische Verwandtschaft zwischen -Ios und dem freien Morphem Ios. 2. Anders als Suffix hat es ein $zus\"{a}tzliches$ semantisches Merkmal. 3. Die Bildungen mit -Ios haben die Fugenelemente. 4. Es konkurriert mit adjektivischen Halbsuffixen. Die $Gr\"{u}nde$, die -Ios als Suffix gelten lassen, sind die folgenden: 1. Im Unterschied zu -frei und -leer dient es zur wertungsneutralen Feststellung des Sachverhalts 'Nichtvorhandensein'. 2. Es besitzt eine einheitliche semantische Funktion. (BS+ -Ios = ohne BS) 3. Es $geh\"{o}rt$ zur Lautstruktur 'KVK'. Diese entspricht der Lautstruktur der adjektiven Suffixe -bar, -lich. -sam usw. Diese verschiedenen Merkmale von -Ios lassen das Morphem noch nicht als Suffix gelten.

• Journal of the Korean Society for Nondestructive Testing
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• v.23 no.6
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• pp.616-621
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• 2003

There are various Non-Destructive Evaluation (NDE) techniques used for measurement of residual stresses in material, such as magnetic methods, X-ray diffraction, Ultrasonic velocity measurement etc. The capabilities, applications and limitations of these techniques for evaluation of cold work/plastic deformation were studied and compared. Mild steel plates were subjected to different degree of cold deformation and were analyzed by Magneto-mechanical Acoustic Emission (MAE), Barkhausen Noise (BN) and magnetic properties (hysteresis loop parameters analysis). Further, these specimens were analyzed by X-ray diffraction and ultrasonic velocity measurements. The microhardness measurement and microstructure studies of these cold worked plates were also carried out. The results of all these studies and comparison of different techniques are discussed in this paper.

• Journal of the Korean Society for Nondestructive Testing
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• v.23 no.6
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• pp.605-615
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• 2003

In practice, it is common to manufacture reference blocks containing simple reflectors to obtain distance-amplitude correction (DAC) curves. However, the construction or DAC curves in this manner requires the use of a large number of specimens with appropriate curvatures and reference reflectors located at various depths. Therefore, less costly and quantitative procedures are strongly needed. To address such a need, in this study, we have developed model-based transfer curves to relate a DAC curve obtained in a particular reference configuration with that for a completely different configuration. An example of transferring DAC curves, using the proposed transfer curves, is given.

• Journal of the Korean Society for Nondestructive Testing
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• v.26 no.6
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• pp.373-379
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• 2006

Vibration-based structural health monitoring is one of non-destructive evaluation (NDE) techniques for civil infrastructures. This paper presents a novel fiber optic accelerometer system to monitor civil engineering structures and a successful application of the novel sensor system for measuring ambient vibration of a real building structure. This sensor system integrates the Moire fringe phenomenon with fiber optics to achieve accurate and reliable measurements. The sensor system is immune to electromagnetic (EM) interference making it suitable for difficult applications in such environments involving strong EM fields, electrical spark-induced explosion risks, and cabling problems, prohibiting the use of conventional electromagnetic accelerometers. A prototype sensor system has been developed, together with a signal processing software. The experimental studies demonstrated the high-performance of the fiber optic sensor system. Especially, the sensor was successfully used for monitoring a real building on UCI (University of California Irvine, USA).

• Journal of the Korean Society for Nondestructive Testing
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• v.28 no.3
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• pp.263-272
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• 2008

Many technical methods are used for nondestructive testing field for solid materials. Among those, ultrasonic inspection methods are widely used and one of the popular methods involves the extraction of an appropriate set of features followed by the use of a neural network for the classification of the signals in the feature space. This paper describes an approach which uses LMS method to determine the coordinates of the ultrasonic probe followed by the use of SAFT with centroid technique to estimate the location of the ultrasonic reflector. The method is employed for classifying UT-NDE signals from the steam generator tubes in a nuclear power plant. The classification results are presented for the ultrasonic signals from cracks and deposits within steam generator tubes.