• Progress in Medical Physics
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• v.7 no.1
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• pp.19-23
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• 1996

The chemical bond differences between a normal tissue and a fat tissue make a chemical shift artifact which is caused by a primary inacuracy of resonance signal location. The chemical shift also makes a variation of the transverse time T$_2$. An attempt is made to compare the values of SNR(Signal-to-Noise Ratio), the signal response, and the imaging time computed by applying T$\sub$2/$\^$＊/ for a fat-proton with ones of those computed by applying T$_2$ for a water-proton under the conditions of T$_1$/T$_2$=3 and T$\sub$2/$\^$＊/T$_2$=0.9. The results of the attempt show that the first two reduce to 5％ and 8％ out of 100％, respectively, and the last rather increases up to 10％. This shows that the chemical shift contributes to the deterioration of an MR imaging efficiency in addtion to the image distortion.

• Journal of the Korea Convergence Society
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• v.12 no.6
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• pp.279-287
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• 2021

Purpose: The purpose of this study was to identify the relationships beween depression, self-efficacy and, treatment adherence in peritoneal dialysis patients. Method: Participants were 139 in a hospital located B city Korea. The data were examined using descriptive statistics, t-test, ANOVA, and Pearson's correlation with SPSS 25.0. Results: Self-efficacy had positive correlation with medication(r=.28 p=.001), fluid restriction(r=.23, p=.008), dietary restriction(r=.38, p<.001) in adherence. Depression had a negative correlation with medication(r=-.17 p=.046), dietary restriction(r=-.17, p=.043) Conclusion: Nursing starategies to strengthen the treatment adherence of patients with peritoneal dialysis need to focus on enhacing self-efficacy and alleviating depression.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.32 no.10
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• pp.27-30
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• 2003

배수관내의 공기의 압력변동을 완화시키는 방법의 하나인 통기밸브 등에 대해 소개한다. 배수설비의 목적은 위생기구로부터의 오배수를 건물 밖으로 신속하게 배출함과 동시에 배수관내에 악취성분을 포함하고 있는 오염된 공기가 실내로 침입하여 실내공기가 오염되는 것을 방지하기 위한 역할도 한다. 하수가스의 침입을 방지하기 위해 각종 형상의 배수트랩을 설치하는데, 여러 가지 원인에 의해 트랩내의 봉수는 파괴되기도 한다. 봉수파괴 원인 중에서도 가장 큰 영 향을 미치는 사이 폰 작용에 의한 봉수 파괴는 배수 수직관 및 수평주관내의 공기의 압력변동이 원인(유도사이펀 현상)이 되어 발생하거나 배수자신(자기사이펀 현상)에 의해 발생한다. 배수관내의 압력은 배수부하가 발생한 경우에는 그 배수에 의한 공기의 이동 등에 의해 변동하며, 배수가 없어도 배수관 접속부의 기압변동이나 상승기류에 의해 변동된다.(중략)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.7021-7033
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• 2015

This study aims to verify the structured relationship between college students' stress and their stress in the meditating depression and self-efficacy. Findings of the research are summarized as follows. The study looked into how stress would directly affect depression and self-efficacy. It was found that the stress would have immediate effects on depression and self-efficacy. In addition, it was noticed that stress indirectly influences college students' subjective happiness in meditating factors of depression and self-efficacy. After the investigation on the immediate effects of depression in relation to the self-efficacy, results of the study indicated that depression has an immediate negative influence on the self-efficacy. Self-efficacy appeared to affect subjective happiness positively and directly. However, its indirect effects on the subjective happiness was confirmed. Although the study failed to find any direct influence of the stress on subjective happiness, it was learned that stress causes an indirect effect through the meditating factors of depression and self-efficacy. In conclusion, the study suggests that subjective happiness can be improved by stress and depression relaxation, and improvement of self-efficacy.

• Journal of the Korean Magnetics Society
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• v.25 no.4
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• pp.129-137
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• 2015

The Cu(radius ra = $95{\mu}m$)/$Ni_{80}Fe_{20}$(outer radius $r_b$ = $120{\mu}m$) core/shell composite wire is fabricated by electrodeposition. The two diagonal components of impedance tensor for the Cu/$Ni_{80}Fe_{20}$ core/shell composite wire in cylindrical coordinates, $Z_{zz}$ and $Z_{{\theta}{\theta}}$, are measured as a function of frequency in 10 kHz~10 MHz and external static magnetic field in 0 Oe~200 Oe. The equations expressing the diagonal $Z_{zz}$ and $Z_{{\theta}{\theta}}$ in terms of diagonal components of complex permeability tensor, ${\mu}^*_{zz}$ and ${\mu}^*_{{\theta}{\theta}}$, are derived from Maxwell's equations. The real and imaginary parts of ${\mu}^*_{zz}$(f) and ${\mu}^*_{{\theta}{\theta}}$(f) spectra are extracted from the measured $Z_{zz}$(f) and $Z_{{\theta}{\theta}}$(f) spectra, respectively. It is presened that the extraction of ${\mu}^*_{zz}$(f) and ${\mu}^*_{{\theta}{\theta}}$(f) spectra from the diagonal impedance spectra can be a versatile tool to investigate dymanic magnetization process in the core/shell composite wire.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.10
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• pp.5069-5077
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• 2013

The purpose of the study was to identify the mediating effects of self-efficacy between job-stress and depression in regional hospitals' workers. The data of this study were collected from 700 hospitals' workers who have been working in 306 hospitals in B city. And the data were collected from Feb. to May 2012. To determine the impact of self-efficacy on job-stress and depression for men and women workers in local hospitals, we measure self-efficacy, job-stress and depression of workers and analyze their relationships. There was a negative relationship between self-efficacy and job-stress(r=-.238, p<.001), depression(r=-.626 p<.001). Verifying the mediating effects of self-efficacy to the impact of job stress on depression, the mediating effects of self-efficacy were significant. It suggests that there is a need to relax the negative impact of job stress through the promotion of self-efficacy for individual or team-level organization.

• Journal of the Korean Magnetics Society
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• v.15 no.2
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• pp.137-141
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• 2005

The CMR properties and magnetic properties of sulphospinels $Zn_xFe_{1-x}Cr_2S_4$ have been explored by X-ray diffraction, magnetoresistance measurement, and $M\ddot{o}ssbauer$ spectroscopy. The crystal structures in the range of x=0.05, 0.1, 0.2 are cubic at room temperature. Magnetoresistance measurement indicates that these system is semiconducting below about 160 K. The temperature of maximum magnetoresistance is almost consistent with Curie temperature. The Zn substitutions for Fe occur to increase the Jahn-Teller relaxation and the electric quadrupole shift. CMR properties could be explained with Jahn-Teller effect, and half-metallic electronic structure, which is different from both the double exchange interactions of manganite La-Ca-Mn-O system and the triple exchange interactions of chalcogenide $Cu_xFe_{1-x}Cr_2S_4$.

• The Journal of the Korea Contents Association
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• v.22 no.1
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• pp.470-483
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• 2022

The purpose of this study was to examine the effect of decentering and self-silencing in a relationship between socially prescribed perfectionism and social anxiety. We predicted self-silencing would function as a mediator in this relationship, and that decentering would moderate this mediation effect. To investigate this aim, three hundred seven university students were surveyed. All variables showed statistically significant correlations, and there was no statistically significant difference in the moderating effect of decentering in the relationship between socially prescribed perfectionism and social anxiety. Conversely, this study showed that there was a significant difference in the moderating effect of decentering in the relationship between self-silencing and social anxiety. In addition, socially prescribed perfectionism affected social anxiety through self-silencing, and decentering moderated the mediating effect of self-silencing. Implications and potential follow-up studies are discussed.

• Korean Journal of Food Science and Technology
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• v.35 no.1
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• pp.57-61
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• 2003

Variations in NMR relaxation time during freezing and thawing processes in pork loins were investigated. Continuous distribution analysis of data obtained from $T_2\;CPMG$ were carried out to observe the changes in water content in the muscles. Solid fat content slightly increased with decreasing temperature, then showed sharp increase at $-4^{\circ}C$, reaching 85% at $-25^{\circ}C$. Relaxation time decreased with decreasing temperature, suggesting that ice crystals gradually formed at freezing temperature. $T_2$ relaxation time during thawing was higher than that during freezing, suggesting that ice crystals melted by thawing and resulted in water loss from meat. Continuous distribution analysis of data obtained from Carr-Purcell-Meiboom-Gill experiments shows one to four components on the spectra during freezing and thawing processes. The area of major components between 30 to 45 ms decreased with decreasing temperature, and were not detected below $-4^{\circ}C$, below which only $T_s$ signal was detected. The area of $T_s$ decreased with decreasing temperature. Between -4 to $10^{\circ}C$, the areas of $T_m$ and $T_l$ during thawing were larger than those during freezing. These results suggest that the exchange between bound water and free water takes place during freezing and thawing.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.6679-6687
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• 2015

purpose : The purpose of this study was examine the effect of self-transcendence and loneliness on quality of life of the elderly. Method : This was a descriptive survey study. The subjects was 171 elderly persons. Descriptive statistics, Pearson's correlation, and stepwise multiple regression were used in analysis of data. Results : Average score were 2.7 for self-transcendence, 2.0 for loneliness, and 3.0 for quality of life. Statistically significant positive correlations were observed between quality of life and self-transcendence. however, from the statistical point view, significantly negative correlation was observed between quality of life and loneliness. self-transcendence, economic status, general health status, loneliness and spouse were significant predictors of quality of life. Conclusion : This study will provide basic information for use in development of a program to encourage a quality of life for elderly persons.