• Journal of Korean Society for Quality Management
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• v.33 no.4
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• pp.75-87
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• 2005

Generally speaking, weapon system is defined as a combination of primary system and support system which are evaluated by capability and operational availability respectively. Recently comparison of total life cycle cost shows that logistic support system is proved to be more important than primary system. However, until now systematic approach to support system development has not been applied in the area of developing support system. We need to construct a universal metric for effectiveness of logistic support system and to cut out whatever activities or support elements which do not contribute to the metric. This paper describes a new approach based on system engineering approach to logistic support system and also classifies five factors of failure, stock-out frequency, administrative delay time, active repair time and logistic delay time that have influence on operational availability of logistic support system.

• Journal of East-West Nursing Research
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• v.14 no.2
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• pp.39-46
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• 2008

Purpose: The study was undertaken from June 1 to July 15, 2008 to assess the effect of social support on self-esteem and life satisfaction in elderly volunteers. Methods: Social support, self-esteem, and life satisfaction were determined using previously established and accepted methods. Data analyses included frequency, ANOVA, t-test, Pearson correlation coefficient, and simple regression. Results: Subjects' social support, self-esteem, and life satisfaction were closely related. The relationships of social support/self-esteem, social support/life satisfaction, and self-esteem/life satisfaction were significant. Social support accounted for 15% of self-esteem and 12% of life satisfaction. Conclusions: Social support is a very important factor influencing self-esteem and life satisfaction of the elderly. Social support, which sustains the mental health of the elderly, represents one of the best strategic nursing interventions.

• Korean Journal of Materials Research
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• v.13 no.10
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• pp.651-657
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• 2003

Ultrasonic microscope has been used to detect the defects on surface or inner solid. Conventionally, it has used at a single operating frequency. The resolution and quality of the measured images are determined by a characteristic of the transducer of the ultrasonic microscope. The conventional ultrasonic microscope has been used envelope detector to detect the amplitude of reflected signal, but the changes in amplitude is not sensitive enough for specimen with microstructure that in phase. In this paper, we have studied multi-frequency depth resolution enhancement with ultrasonic reflection microscope for the reflectors of a stainless steel reference specimen and a reference calibration block to be used as the material in nuclear power plants for ISI, PSI. Increased depth resolution can be obtained by taking two, three-dimensional images at more that one frequency and numerically combining the results. As results of the experiment, we could get enhanced images with the rate of contrast in proportion and high quality signal distribution for the image to the changing rate of depth for the reflectors of the two kinds of specimens.

• Journal of the Korea Society for Simulation
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• v.7 no.2
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• pp.115-123
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• 1998

A simulation is performed to investigate the effect of the pipe supports on the change of the natural frequencies of curved pipe systems containing fluid flow, for different elbow angles and geometry of the pipe systems. Based upon the Hamilton's principle, the equations of motions are derived, and the finite element equation is constructed to solve the corresponding eigenvalue problem. The angles of elbows do not affect the change of the fundamental natural frequency, but affect the change of the third or higher natural frequencies. Without any support, the change of the fundamental natural frequency due to the geometric change is smaller than the change of the second or higher natural frequencies. The more curve parts exist in the pipe system, the less change of lower frequency range, compared with the change of higher frequency range, is observed. Spring supports can be used to reduce the fundamental natural frequency, without change of the second or higher natural frequencies. To avoid resonance, which is critically dangerous from the view point of structural dynamics, the mechanical properties such as stiffness or the location of pipe supports are need to be changed to isolate the natural frequencies from the frequency range of dominant vibration modes.

• Journal of the Institute of Convergence Signal Processing
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• v.16 no.2
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• pp.63-68
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• 2015

This paper proposes a robust multiple audio watermarking algorithm using improved QIM(quantization index modulation) with adaptive stepsize for different signal power and SVM(support vector machine) decoding model. The proposed algorithm embeds watermarks into both frequency magnitude response and frequency phase response using QIM. This multiple embedding method can achieve a complementary robustness. The SVM decoding model can improve detection rate when it is not sure whether the extracted data are the watermarks or not. To evaluate robustness, 11 attacks are employed. Consequently, the proposed algorithm outperforms previous multiple watermarking algorithm, which is identical to the proposed one but without SVM decoding model, in PSNR and BER. It is noticeable that the proposed algorithm achieves improvements of maximum PSNR 7dB and BER 10%.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.10a
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• pp.402-403
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• 2014

Damping of multi-span tube with loose supports according to the finite support clearances is investigated through the experimental modal analysis. Loose intermediate support leads to strong nonlinearity in tube dynamics, provides statistical nature, and increases tube damping through impacting and friction at the supports. Fraction of critical damping was estimated by the modal curve fitting to parameter estimation from the measured frequency response functions. Magnitude of random excitation force, which can reproduce the in-situ excitation in operating environment, was maintained as constant value with a fine tolerance during vibration testing. Range of input force was carefully selected to cover from the low magnitude excitation for linearly behaved tube motion to high magnitude of force for nonlinearly-behaved tube motion. Estimated critical damping ratio shows scatters in data and tends to increase as the magnitude of rising force and decrease with upward frequency variation. Larger size of support gap increases multi-span tube damping for high magnitude of excitation.

• The Journal of Korean Academic Society of Nursing Education
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• v.8 no.1
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• pp.72-83
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• 2002

The purpose of this study was to investigate the level of social support, loneliness, alcohol use and perceived health status in college students and to explore the relationships between the variables. The convenience sample consisted of 473 students attending a college located at Chonnam province. Data were collected by a structured questionnaire which included the PRO85-partⅡ Social Support Scale, revised UCLA Loneliness Scale, Alcohol frequency, Perceived Health Status Scale from June 10 to 25, 2001. And data were analyzed by SPSS/PC+program including descriptive statistics, t-test, ANOVA, Pearson's Correlation Coefficients. The results are summarized as follows; 1. The mean scores of social support, loneliness and perceived health status were 3.01($SD={\pm}0.31$), 2.08($SD={\pm}0.34$), 1.64($SD={\pm}0.65$) respectively. 2. Students in use of alcohol mostly reported that they had started a drinking in the period of high school(35.7%), motivated with friendship(32.6%) and drank with their friends(56.9%) in drinking frequency of 2-3times per a month(49.6%). 3. The students who have friend of the opposite sex were significantly more likely to have higher than the students having no friend of the opposite sex in scores of social support. 4. The scores of loneliness were significantly lower in female students than male students, in students with friend of the opposite sex than with no friend of the opposite sex. 5. There were significant negative correlations between social support and loneliness(r=-5.25, p<.000), and between loneliness and perceived health status(r=-0.93, p<.05), while there was a significant positive correlation between social support and perceived health status(r=1.01, p<.05). The findings suggested that supportive social support, especially lowering loneliness, would be a powerful nursing intervention in maintaining good health of college students. And, more variables affecting health status in college students will be identified with further research.

• Proceedings of the KSPS conference
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• 2002.11a
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• pp.93-96
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• 2002

This research studied the correlation of word frequency effect in Korean corpus. Experiment 1 showed that word frequency of each other corpus was significant correlated. Experiment 2 showed significant correlation between word frequency of each corpus and lexical decision time of participants. These results support that 4 corpus in this research should have stability to word frequency effect of participants

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.960-962
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• 2017

This thesis suggests method that How sound sources used to simulation that can be used to military training and education divide each frequency and each bandwidth filtering method. method for frequency dividing and denoising are suggested into Wavelet analysis. And We materialize authoring tool about filtering that design for wavelet job.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.547-550
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• 1997

The dynamic behavior of rotor-bearing system has been investigated using finite element method. A procedure is presented for dynamic modeling of rotor-bearing system which consist of shaft elements, rigid disk, flexible bearing and support structures. A finite element model including the effects of rotary inertia, shear deformation, gyroscopic moments is developed. Linear stiffness and damping coefficient are calculated for 3 lobe sleeve bearing. The whirl frequency, mode shape, stability and unbalance response of rotor system included effect of bearing coefficient and support structures are calculated.