• The Journal of Engineering Geology
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• v.16 no.1 s.47
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• pp.31-43
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• 2006

As a result of calculating bearing capacity of soft silt soil(ML) and soft silt soils(ML', SM, SM') mixed with sand, all kinds of soils showed smaller values than existing expressions and when theoretical values are applied, considerable review is required. It was found that ultimate surcharge(bearing capacity) of soft silt soil was $q_{ult}=1.34C_u$ that of ML' soil in soft silt soils mixed with 3 kinds of sand $q_{ult}=1.40s$, that of SM soil $q_{ult}=1.73s$ and that of SM' soil $q_{ult}=2.72s$, Consequently, as content of sand having greater permeability than silt soil in creased, soil was stabilized gradually.

• Journal of Korean Physical Therapy Science
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• v.1 no.2
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• pp.235-241
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• 1994

Myofascial pain syndrome is a common cause of physical disability and reduces the activity of the patient. The purpose of this study was review and analysis efficiency of myofascial pain syndrome with low back pain on 50 case who were treated at the Tae Jon Nam, Myung Ho rehabilitation clinic, from January 1, 1994 to May 31, 1994. The results of this study are as follows : 1. of the 50 cases, 24(48.0%) were male and 26(52.0 %) were female. The most common age group was 40 to 30 years old. 2. The most common duration of the treatment and onset were more than 25 months with 22(44.0 %) and less : 3. As for a major causative disease of low back pain with myofascial pain sndrome, without known cause(30.0 %), lifting object(16.0 %), post exercise(14.0 %) and heavy work(12.0 %). 4. Involved muscle with low back pain reviewed I. C. L(31.0 %), Q. L, Gluteus and others muscle(23.0 %). 5. Disease history and treatment duration were proportioned. 6. Involved muscle distribution for causative disease was 26.0 % post exercise to I. C. L, 33.5 % lifting object to Q. L, 40.0 % without known to gluteus. 7. Low back pain with syndrome was buttock and thigh Pain with 44.0 %, only low back pain with 36.0 %. 8. The improvement by physical therapy on the low back pain was good 24.0 %, fair 56.0 % etc respectively. * I.C.L : Iliocostalis lumborum * Q.L : Quadratus lumborum.

• Bulletin of the Korean Chemical Society
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• v.25 no.5
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• pp.704-710
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• 2004

A poly(1-hexyl-3,4-dimethyl-2,5-pyrrolylene) (PHDP) was prepared and its luminescence in tetrahydrofuran (THF) was studied. When PHDP is excited by UV light, it produces very strong blue luminescence. The quantum yield of PHDP (Q = 36.9%) is much greater than that of the monomer, 1-hexyl-3,4-dimethylpyrrole (HDP) with Q = 0.61%. The principal luminescence of PHDP has a single decay component with ca. 1 ns, whereas the decay of HDP is complicated. The molecular structure and conformational behavior of HDP and the oligomers up to trimer have been also determined by ab initio Hartree-Fock (HF/6-31$G^{**}$), density functional theory (DFT-B3LYP/6-31$G^{**}$), and semiempirical (ZINDO) methods. According to the results of calculations, it is proposed that the enhanced quantum yield of the polymer PHDP results mostly from the ${\pi}$-conjugation between neighboring pyrrole rings.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.11
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• pp.335-347
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• 2019

This study was undertaken to investigate the relationship between social support and depression of the elderly in care facilities. We enrolled 328 elderly people aged 65 years or older, admitted to 15 care facilities located in D metropolitan city. Data were collected through personal interviews conducted by interviewers who visited each care facility, from March 1 to May 31, 2018. Our results indicate a significantly higher distribution of depression in the group having lower social support; the score of depression was determined to be in a significant positive correlation with social support. Considering logistic regression, the adjusted odds ratio in the depressed group increased significantly by 2.7 times in the high group (Q3), 5.4 times in the middle group (Q2) and 10.1 times in the low group (Q1), which had the very high group of social support score. Multiple regression analysis revealed that the factors influencing depression include religion status, relationship with children, subjective health status, physical disabilities, smoking status, breakfast status, and social support, and the explanation power of the injected variables is 41.1%. Taken together, our findings indicate that the level of depression amongst the elderly in care facilities is significantly related to the social support available.

• Tuberculosis and Respiratory Diseases
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• v.58 no.5
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• pp.490-497
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• 2005

Background : The paraoxonase enzyme plays a significant role in the detoxification of various organophosphorous compounds in mammals, and paraoxonase (PON) 1 is one of the endogenous free-radical scavenging systems in the human body. In this study, we investigated the interaction between cigarette smoking and the genetic polymorphism of PON1 with lung cancer in Korean males. Methods : Three hundred thirty five patients with lung cancer and an equal number of age-matched controls were enrolled in this study. Every subject was asked to complete a questionnaire concerning their smoking habits and alcohol drinking habits. A 5' exonuclease assay (TaqMan) was used to genotype the PON1 Q192R polymorphism. The effects of smoking habits and drinking habits, the PON1 Q192R polymorphism and their interactions were statistically analyzed. Results : Cigarette smoking and the Q/Q genotype of PON1 were significant risk factors for lung cancer. Individuals carrying the Q/Q genotype of PON1 were at a higher risk for lung cancer as compared with those individuals carrying the Q/R or R/R genotype (odds ratio, 2.84; 95% confidence interval, 1.69 - 4.79). When the groups were further stratified by the smoking status, the Q/Q PON1 was associated with lung cancer among the current or ex-smokers (odds ratio, 2.56; 95% confidence interval, 1.52 - 4.31). Current smokers or ex-smokers who had the Q/Q genotype showed an elevated risk for lung cancer (odds ratio: 15.50, 95% confidence interval: 6.76 - 35.54) as compared with the group of subjects who never smoked, and had the Q/R or R/R genotype. The odds ratios (95% confidence interval) of smokers with the PON1 Q/Q type compared to the nonsmokers with the PON1 Q/R or R/R type were 53.77 (6.55 - 441.14) for squamous cell carcinoma, 6.25 (1.38 - 28.32) for adenocarcinoma, and 59.94 (4.66 - 770.39) for small cell carcinoma, and these results were statistically significant. Conclusion : These results suggest that cigarette smoking and the PON1 Q/Q genotype are risk factors for lung cancer. The combination of cigarette smoking and the PON1 Q/Q genotype significantly increased the lung cancer risk irrespective of the histologic type of cancer.

• Journal of the Korea Convergence Society
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• v.10 no.11
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• pp.437-444
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• 2019

The purpose of this study is to stereotype the subjective perception of multicultural societies of university students and to identify the characteristics and differences by types. To this end, the Q methodology was utilized and 31 college students were selected. According to the analysis, there were four types of university students' perception on multicultural societies. Type 1 was an 'aggressive acceptance' which aggressively and positively embraces multicultures. Type 2 was a 'its national first priority', which put the Korean first before immigrants. Type 3 was 'reasonable acceptance' that accepts multiculturalism within the reasonable and legal bounds. Type 4 was 'limited permission' which agrees to accept immigrants restrictively. Based on the results of this study, thought-provoking ways needed to realize multicultural societies were explored.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.10 no.1
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• pp.31-37
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• 2017

In this paper, we implemented for the development of a high output induction lamp system, which lamp design is optimized by gas type, mixing ratio, pressure and discharge tube size, amalgam type and mixing ratio, and characteristics of ferrite core in the lamp. It's the circuit design by improving the power factor and efficiency according to the driving method, which has analyzing the characteristics according to the waveform and frequency. Finally, luminaries design part for applying the optimal lighting system considering the surrounding environment, the characteristics of the lighting circuit for electrodeless lamp has analyzed and the improvement has been proceeded. In conclusion, the driving frequency has optimized at 135kHz with degrading $7{\sim}10^{\circ}C$ based on the results of the optical characteristics of the induction lamp on peak noise FET(Q3,Q4) damage.

• Current Optics and Photonics
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• v.4 no.3
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• pp.238-246
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• 2020

The heat distribution in crystals in a 2-㎛ acousto-optic Q-switched Tm:LuAG laser pumped by pulsed-laser-diode (pulsed-LD) intermittent-pumping technology was analyzed using COMSOL software. The thermal lensing effect of the Tm:LuAG crystal can be mitigated by pulsed-LD intermittent-pumping techniques. An experimental setup using this kind of approach achieved maximum output energy of 8.31 mJ, minimum pulse width of 101.9 ns, and highest peak power of 81.55 kW, reached at a Q-switched repetition rate of 200 Hz. It offers significant improvement of performance of the output laser beam, compared to pulsed-LD double-ended pumping technology at the same repetition rate.

• Analytical Science and Technology
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• v.31 no.6
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• pp.219-224
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• 2018

The fruit and stem of Opuntia ficus-indica var. aboten (OFS), a native plant of Jeju Island, are considered a safe food source. Moreover, stem extracts have been previously reported to possess a variety of biological effects (e.g. anti-inflammatory and anti-oxidant, including the ability to partially ameliorate cognitive impairment), suggesting that this plant may have utility as a functional food. The present study investigated whether fermentation by lactic acid bacteria enhances the biological effects of OFS extracts. The acetylcholinesterase (AChE) inhibitory activity of fermented or non-fermented OFS extracts was evaluated, and the content of marker components dihydrokaempferol (DHK) and quercetin-3-methyl ether (3-MeQ) was analyzed using high-performance liquid chromatography. Fermented (relative to non-fermented) OFS extracts exhibited improved AChE inhibitory activity ($IC_{50}=28.35 mg/mL$), with AChE inhibitory activity resulting from fermentation by L. plantarum ($IC_{50}=12.56mg/mL$) exceeding that resulting from fermentation by L. fermentum ($IC_{50}=17.71mg/mL$). Furthermore, fermented (relative to non-fermented) OFS extracts exhibited a 16.7 % increase in DHK content, and 3-MeQ content of OFS extracts fermented by L. plantarum and L. fermentum increased by 28.6 % and 21.4 %, respectively. Therefore, OFS stem extract AChE inhibitory activity, as well as DHK and 3-MeQ content, was enhanced by fermentation with Lactobacillus spp. This suggests that fermented OFS extracts may contribute to prevention or improvement of cognitive impairment. These data are anticipated to be useful in the development of enhanced-efficacy OFS products.

• The Journal of Korean Academic Society of Nursing Education
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• v.29 no.3
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• pp.247-262
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• 2023

Purpose: This study aimed to identify the types of perception toward non-face-to-face clinical practice and to characterize the types of students who experienced online clinical practice during the coronavirus disease 2019 (COVID-19) pandemic. Methods: Q-methodology was used in this study, and 270 Q populations were formed based on in-depth interviews with 10 nursing students who had experienced non-face-to-face clinical practice, as well as related literature. Interviews were performed from August 1 to 31, 2022. A total of 42 Q samples were extracted, and Q sorting was performed on 33 nursing students who had experienced non-face-to-face clinical practice. A Q factor analysis was performed using the PC-QUANL program. Results: The nursing students' perceptions of non-face-to-face clinical practice were classified into the following five types: "future professional competency-focused type," "realistic convenience priority type," "task burden awareness type," "negative critic type," and "limited experience dissatisfaction type." Conclusion: This study revealed non-face-to-face clinical practice's positive and negative aspects in nursing education. Moreover, it identified the aspects of clinical practice that cannot be replaced by non-face-to-face clinical practice and the elements of non-face-to-face practice that can complement clinical practice. These findings can be used as fundamental data to establish a stable and efficient system for improving the quality of clinical practice in the post-COVID-19 era and to implement effective non-face-to-face clinical practice according to student types.