• Journal of Welding and Joining
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• v.32 no.6
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• pp.8-13
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• 2014

One of the main challenges of the automatic arc welding process which has been widely used in various constructions such as steel structures, bridges, autos, motorcycles, construction machinery, ships, offshore structures, pressure vessels, and pipelines is to create specific welding knowledge and techniques with high quality and productivity of the production-based industry. Commercially available automated arc welding systems use simple control techniques that focus on linear system models with a small subset of the larger set of welding parameters, thereby limiting the number of applications that can be automated. However, the correlations of welding parameters and bead geometry as welding quality have mostly been linked by a trial and error method to adjust the welding parameters. In addition, the systematic correlation between these parameters have not been identified yet. To solve such problems, a new or modified models to determine the welding parameters for tandem GMA (Gas Metal Arc) welding process is required. In this study, A new predictive model called STACO model, has been proposed. Based on the experimental results, STACO model was developed with the help of a standard statistical package program, MINITAB software and MATLAB software. Cross-comparative analysis has been applied to verify the reliability of the developed model.

• The Journal of the Korea Contents Association
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• v.15 no.7
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• pp.618-628
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• 2015

The purpose of this study was to seek out the structural relation among Relationship Benefits, Customer Satisfactions, and Customer Preference of members to Personal Training. For the subject of this study, we selected 227 persons among men of more than 20 years old age who used Personal Training Center more than 1 month through the Convenient Sampling Method. For the analysis, we used SPSS 15.0 Statistics Package and AMOS 7.0 program as a research tool and have carried out Frequency Analysis, Confirmatory Factor Analysis, Reliability Analysis, and Structural Equation Model Analysis. The results were as follows: First, the Customization Benefits among Relational Benefits have a positive effect on the Customer Satisfaction. Second, the Psychological Benefits and Social Benefits among Relational Benefits have a positive effect on the Customer Preference. Third, the Customer Satisfaction has a positive effect on the Customer Preference.

• Journal of the Korean Ceramic Society
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• v.52 no.4
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• pp.229-233
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• 2015

Currently, the majority of commercial white LEDs are phosphor converted LEDs made of a blue-emitting chip and YAG yellow phosphor dispersed in organic silicone. However, silicone in high-power devices results in long-term performance problems such as reacting with water, color transition, and shrinkage by heat. Additionally, yellow phosphor is not applicable to warm white LEDs that require a low CCT and high CRI. To solve these problems, mixing of green phosphor, red phosphor and glass, which are stable in high temperatures, is common a production method for high-power warm white LEDs. In this study, we fabricated conversion lenses with LUAG green phosphor, SCASN red phosphor and low-softening point glass for high-power warm white LEDs. Conversion lenses can be well controlled through the phosphor content and heat treatment temperature. Therefore, when the green phosphor content was increased, the CRI and luminance efficiency gradually intensified. Moreover, using high heat treatment temperatures, the fabricated conversion lenses had a high CRI and low luminance efficiency. Thus, the fabricated conversion lenses with green and red phosphor below 90 wt% and 10 wt% with a sintering temperature of $500^{\circ}C$ had the best optical properties. The measured values for the CCT, CRI and luminance efficiency were 3200 K, 80, and 85 lm/w.

• Smart Structures and Systems
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• v.19 no.2
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• pp.181-194
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• 2017

In order to investigate the interface debonding defects detection mechanism between steel tube and concrete core of concrete-filled steel tubes (CFSTs), multi-physical fields coupling finite element models constituted of a surface mounted Piezoceramic Lead Zirconate Titanate (PZT) actuator, an embedded PZT sensor and a circular cross section of CFST column are established. The stress wave initiation and propagation induced by the PZT actuator under sinusoidal and sweep frequency excitations are simulated with a two dimensional (2D) plain strain analysis and the difference of stress wave fields close to the interface debonding defect and within the cross section of the CFST members without and with debonding defects are compared in time domain. The linearity and stability of the embedded PZT response under sinusoidal signals with different frequencies and amplitudes are validated. The relationship between the amplitudes of stress wave and the measurement distances in a healthy CFST cross section is also studied. Meanwhile, the responses of PZT sensor under both sinusoidal and sweep frequency excitations are compared and the influence of debonding defect depth and length on the output voltage is also illustrated. The results show the output voltage signal amplitude and head wave arriving time are affected significantly by debonding defects. Moreover, the measurement of PZT sensor is sensitive to the initiation of interface debonding defects. Furthermore, wavelet packet analysis on the voltage signal under sweep frequency excitations is carried out and a normalized wavelet packet energy index (NWPEI) is defined to identify the interfacial debonding. The value of NWPEI attenuates with the increase in the dimension of debonding defects. The results help understand the debonding defects detection mechanism for circular CFST members with PZT technique.

• Journal of The Korean Society of Integrative Medicine
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• v.6 no.3
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• pp.93-102
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• 2018

Purpose : The purpose of this study was to conduct an in-depth interview with dentists in order to provide fundamental data regarding their thoughts in relation to the dental hygiene process of care and its necessity in clinical practice, with the aim of ensuring that dental hygienists can perform their duties as experts. Method : Following explanation of the study, we administered the questionnaire to those who agreed to participate between September 26 and October 28, 2017. A Naver-form (mobile) questionnaire was distributed to the research subjects for data collection. Data were analyzed using SPSS (Statistical Package for the Social Sciences) 24.0. Analysis was performed by calculating the frequency and percentage of the general characteristics of the subjects, occupational expertise, and the dental hygiene process of care. Result : Among the 56 research subjects, 48 (85.7 %) were men and 8 (14.3 %) were women. Awareness on the part of respondents of the job responsibilities associated with the dental hygiene process of care ratio was as follows: 11 (19.6 %) categorized their level of knowledge regarding the dental hygienist's job duties as "very much know"; 13 (23.2 %) as "somewhat know"; 18 (32.1 %) as "neither"; and 9 (16.1 %) as "somewhat don't know", while 5 (9.0 %) said "I have no idea". The dental hygiene process of care was categorized as "very much necessary" by 50.0 % of respondents; as "somewhat necessary" by 35.7 %; and as "neither" by 14.3 %. Conclusion : The dental hygiene process of care is one of the methods used to continuously manage patients with dental-related concerns. Recently, the management of patients in the dental clinic has changed from a disease treatment model to a concept of active prevention for improving the quality of life related to oral health. The dental hygiene process of care is considered a very necessary dental health care service because it functions to continuously introduce oral health care or preventive care programs in clinical practice.

• Journal of Korean Academy of Nursing
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• v.30 no.4
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• pp.967-981
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• 2000

The purpose of this study is to evaluate the effects of Chu-ma therapy and to suggest that the therapy is an effective nursing intervention tool to reduce blood pressure. The research design employed was the non-synchronized research method with non- equivalent control group. A total of 30 people with essential hypertension, who were from forty to sixty five years old, participated in the study. The Chu-ma therapy was administered by every day for ten or fifteen minutes for eight weeks from 19, April to 13, June in 1999. In order to evaluate the effects of Chu-ma therapy, blood pressure of the two groups were measured once a week, and physiological parameters (epinephrine, norepinephrine, total cholesterol, HDL-cholesterol, triglycerides) were measured before and after the treatment. Collected data was analyzed by SAS package. The results of this study can be summarized as follows : 1) There were significant decrease in systolic blood pressure and diastolic blood pressure in the experimental group. 2) There were no significant changes in epinephrine, norepinephrine of the two groups. 3) There were significant decrease in total cholesterol and triglycerides, and HDL- cholesterol increased significantly in the experimental group. 4) The effect of Chu-ma therapy on the measured time on the blood pressure in experimental group was as follows: Both of systolic and diastolic blood pressures were significantly decreased after 5weeks. The result proved that Chu-ma therapy is an effective nursing intervention tool for clients with essential hypertenion. However further research is still necessary to compare the effect with the different periods and number of times for Chu-ma therapy.

• Journal of Fashion Business
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• v.11 no.4
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• pp.42-51
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• 2007

The purpose of this study is to develop clothing design for mild dementia patients who display positive action in clothing for the improvement of the quality of life of the dementia patients following the symptoms of patients in accordance with the clinical classification to provide the functional assistance for ordinary living as well as emotional stability and aesthetic functions for the dementia elderly. The method of research is performed for theories through the advanced research and documentary data, and interpreted in functional and aesthetic level on the basis of the result of advance survey related to the characteristics of the mild dementia patients and clothing conduct of elderly with light dementia to select the material, color, decoration and functional design with four pairs for women and two pairs for men. Designs for the total of six have been actually produced by making the map, including the material swatch, color and others. The questionnaire as the measuring tool is used and the assessment category is made for the adaptability of design on each category. On the six clothes that are produced for the mild dementia patients, the statistics package SPSS Ver 12.0 is used for the data analysis on questions 8-10 for the frequency analysis. In overall, the leisure clothing for mild dementia patients developed from this research are generally satisfied, and overall type, material, color, detail and arrangement are generally evaluated highly, and have the assessment of normal or better in the color size and type.

• Journal of Korean Academy of Nursing
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• v.26 no.2
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• pp.372-386
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• 1996

Recently, the ratio of elderly in the population are fast growing due to socio-economical development and the better medical service. Proportionally, the health problems in elderly are increasing, too. Medical professionals must try so that the elderly have the better life through health promotion and disease prevention as well as disease treatment. This study evaluated the effect of walking exercise program on the cardiorespiratory function and the flexibility in the elderly women. The design of research was one group pretest-posttest design. The subjects were eleven elderly women over sixty years old to live in K-city, Kyonggi-do. The type of exercise was walking, which was the most popular exercise in questionnaire. The exercise intensity was 40％∼60％ of the target heart-rate by Karvonen's method and maintained by the heart-rate monitor. The exercise period was five weeks and the exercise frequency was three times per week. The exercise duration was forty minutes at first and gradually increased up to an hour. In order to evaluate the effect of walking exercise, we measured VO/sub₂ max, resting heart -rate, systolic/diastolic blood pressure, FVC, FEV/sub₁, the flexibility before and after the five week's exercise program. The data are analyzed by the paired t-test and Wilcoxon signed rank test using SAS package. The results are as follows : 1) The hypothesis that cardiorespiratory function will be improved was partly supported. In VO/sub₂ max（p＝0.0001）, resting heart-rate（p＝0.0030）, systolic/diastolic blood-pressure（p＝0.0387／ p＝0.0024）, there was significant difference. FVC and FEV/sub₁ were increased after the exercise, but there were no significant difference. 2) The hypothesis that the flexibility will be improved was supported. There was significant difference in the flexibility（p＝0.0140）. As the further study, it is necessary to reevaluate the effect with more refined design. We also need to try meta-analysis about the results of previous studies obtained in the experimental setting and compare our result obtained in the field setting with them.

• Journal of Technologic Dentistry
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• v.13 no.1
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• pp.99-122
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• 1991

This study was conducted to investigate the job satisfaction of the dental technicians and evalate the relationship between it’s scores and certain variables. One hundred eighty dental technicians were sampled from 300 among the 2552 dental technicians by wide distribution method, in September 1990. Data were collected by administering the instrument, the researcher developed for measuring the independent and dependent variables. The statistical methods utilized in this study were one-way analysis of variance, correlation and multiple regression analysis. The data were analyzed by SPSS(Statistical Package for Social Science), utilizing PC. The statistical significance was tested at 0.05 level. The major findings of the study were as follows : 1. The job satisfaction measuring instrument, the researcher developed, could measured the job satisfaction of dental technicians. The Maximum score of the instrument was 125, the highest score of dental technicians was 106, the lowest score was obtained 38, the mean score was 72.228 and standard deviation was 12.804. 2. The personal variables of dental technicians were related with the job satisfaction scores. The job satisfaction scores were positively correlated, at 0.01 level, with the scores of age(r=0.379), year(r=0.218), aptitude(r=0.415), marry(r=0.202), income(r=0.381), career(r=0.316). 3. The family variables scores of dental technicians were not correlated with the job satisfaction scores. 4. The personal characteristics of dental technicians were related with the job satisfaction. The job satisfaction score were positively correlated beyond the significant level, with the cheerfulness scores(r=0.398) and stability scores(r=0.224). 5. The job-related variables of the dental technicians were related with the job satisfaction scores. The correlation coefficient between job satisfaction scores and turnover scores was r=0.23, and quantity scores was r=0.300.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.2
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• pp.109-126
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• 2018

Librarians, who provide the public with library services at public libraries, are employees whose jobs are often require emotional labor. The emotional labor of librarians working at public libraries can result in stresses caused by the discrepancy between the library's emotional requirements and the librarian's personal emotions, which may influence organizational effectiveness, such as organizational commitment and job satisfaction. In that, this study intends to examine the influence of emotional labor on the organizational commitment and job satisfaction of librarians working at public libraries. To do so, based upon the conceptual underpinning through literature reviews of librarians working at public libraries and emotional labor, this study constructs a theoretical framework of organizational commitment and job satisfaction of librarians. Using a questionnaire survey method, this study surveys 238 public library staff from 33 public libraries in the Seoul metropolitan area, statistically examines the response through the SPSS20 statistical package, and analyzes the relationship between and among the variables. Based on the analysis, discussion on the influence of the emotional labor on organizational commitment and job satisfaction of librarians working at public libraries follows.