• Journal of the Korean Chemical Society
• /
• v.43 no.5
• /
• pp.517-521
• /
• 1999

Gas chromatography using sulfur chemiluminescence detection (GC-SCD) which exhibits very good selectivity, linearity, and sensitivity was applied to the analysis of suIfur compounds in gaseous fuel. The expectmental method used in this study was to resolve the problems of repeatability and reproducibility by means of the adsorption of sulfur compounds, which is different from the existing analysis method of these compounds by GC-SCD. The calibration curves of the standard gases including dimethyl sulfide, t-butylmercaptan and ethyl methyl sulfide exhibited an excellent linearity. As the result of precision tests for the above three compounds, the high reproducibility for tests showed while repeating three times during four days, respectively. In addition, the coefficient of variation was less than 3%. In consequence, the expectmental method of this study is very effective not only with low uncertainty but also with better accuracy, which can quickly determine the concentration of gas odorants in LPG (Liquefied Petroleum Gas) from oil reservoirs and filling stations.

• Tunnel and Underground Space
• /
• v.13 no.2
• /
• pp.77-86
• /
• 2003

The finite element method and statistics of the convergence measurement are useful method of the stability analysis of the tunnel adjacent to the pier. It is the purpose of the this case study to certificate of validity of the application of those methods. The safety of the pilot tunnel method and LW pre-grouting has been evaluated from the FEM analysis. The three-dimensional finite element method is carried out for the decision of the level of stress redistribution at the two-dimensional numerical analysis. An analysis of the convergence is carried out by the estimation of preceding convergence at tunnel excavation. F-examination is applied for this estimation. As results of that analysis, The F-value is from 10.81 to 158.74 and the coefficient of determination is from 0.82 to 0.99. An analysis of convergence is carried out by using regression analysis. Consequently, it is shown that the convergence can be modeled as following function C(t)=a[1-exp(-bt)].

• The Journal of the Korea Contents Association
• /
• v.15 no.2
• /
• pp.455-465
• /
• 2015

This study aims to provide basic data for hospital organizational management by analyzing perception of organizational culture of general hospital employees and its effect on organizational trust activities. A total of 437 employees from the 5 general hospitals in G city were surveyed with anonymous self-administered questionnaires and the result was analyzed by t-test, analysis of variance, Pearson correlation analysis, and multiple regression analysis. As a result, there were differences in the perception of organizational trust culture depending on sex, age, education, and income. The perception of organizational trust culture had a significantly positive correlation with organizational trust activities. The factors such as consideration, social responsibility, morality, and competence had a significantly positive effect on organizational trust activities. This study would help to improve the organizational trust that is perceived by hospital employees by improving organizational trust culture with policy and institutional support.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.53 no.2
• /
• pp.62-69
• /
• 2016

This paper proposes to select Measure of Performance(MOP) for object attainment in the counterfire operation and deduce the reasonable combination of blue force's hitting resources satisfying MOP's optimal value and regression equation for the object achievement time. Also, in the study-methodological perspective, a series of procedures for drawing the regression equation from the real world is presented. Firstly the model was made by simplifying the weapon-system information of red force and blue force, then the time for object attainment was derived from its simulation. Simulating the model for the counterfire operation was divided into three phases-detection, decision and hitting. The probability method by applying the random numbers were used for detection, fixed constant numbers for decision and hitting. The simulation was repeatedly performed to get the minimum time for the object attainment against the fixed enemy, and it was estimated as the optimal value of simulation. From this result, the optimum combination of blue force's weapon system against the red force and finally, the regression equation were obtained by using the response surface analyzing method in MINITAB. Thereafter this equation was completely verified by using 'the 2-sample t-test.' As a result, the regression equation is suitable.

• Journal of the Korean Geophysical Society
• /
• v.7 no.4
• /
• pp.313-324
• /
• 2004

The finite element method and statistics of the convergence measurement are useful method of the stability analysis of the tunnel adjacent to the pier. It is the purpose of the this case study to certificate of validity of the application of those methods. The safety of the pilot tunnel method and LW pre-grouting has been evaluated from the FEM analysis. The three-dimensional finite element method is carried out for the decision of the level of stress redistribution at the two-dimensional numerical analysis. An analysis of the convergence is carried out by the estimation of preceding convergence at tunnel excavation. F-examination is applied for this estimation. As results of that analysis, The F-value is from 10.81 to 158.74 and the coefficient of determination is from 0.82 to 0.99. An analysis of convergence is carried out by using regression analysis. Consequently, it is shown that the convergence can be modeled as following function C(t) = a[1-exp(-bt)].

• Journal of Convergence for Information Technology
• /
• v.11 no.10
• /
• pp.215-222
• /
• 2021

The purpose of this study was to analyze the factors affecting the awareness of temporomandibular disorders in high school students and to provide basic data for the development of easy-to-access program to help the management of temporomandibular disorders. For data collection, convenience sampling was performed among academic high school students in Daejeon and North Jeolla Province to complete a self-administered questionnaire from December 1 to 30, 2019. The statistical analysis was conducted by t-test, one-way ANOVA, and Pearson correlation. Stepwise multiple regression analysis was conducted. Oral parafunctional habits were positively correlated with trait anxiety and both of them were positively correlated with the perceived symptoms of temporomandibular disorders. The most influential factors on the awareness symptoms of temporomandibular disorders in high school students were oral parafunctional habits, health habits, and trait anxiety. It is necessary to make positive communication and intervention, which meets high school age, in coping well with anxiety and managing oral parafunctional habits and apply an oral health promotion program that involves socio-psychological efforts to prevent them.

• Journal of Digital Convergence
• /
• v.17 no.3
• /
• pp.463-471
• /
• 2019

The purpose of this study was to investigate the effect of muscle imbalance on motion of back squat. The isokinetic muscle strength of the 8 subjects was recorded for the knee flexion/extension by the cybex 770 dynamometer. Each subject performed 3 back squats with the long barbell with an intensity of 25% body weight(BW), 50%BW, 100%BW, 125%BW. During the back squat through the recorded kinematic data the subjects' maximum flexion and extension knee angle, center of mass displacement and V-COP were calculated for evaluation of the stability of the movement. For the statistical analysis independent t-test was used. Knee flexion angle and COM displacement are dominated by the reciprocal muscle ratio. V-COP factor was dominated by bilateral extension deficit. Based on the results we can know that as the intensity of the squat increased to a level control was difficult because the muscles' imbalance influenced the movement.

• Korean Journal of Agricultural Science
• /
• v.8 no.1
• /
• pp.82-89
• /
• 1981

The characteristic of rainfall intensity in short duration is very important to calculate short-term runoff in small watershed by Rational method. Therefore, the purpose of this study is to derive the most proper formula on the probable rainfall intensity in each return period in Daejeon area. And the results of this study could be utilized for the design of drainage-structures in small watershed, drainage system in urban area and flood control in small river basin. The result s of this study are summerized as follows. 1. Gumbel-Chow method which shows the mean value was chosen to calculate the probable rainfall in tensity in each return periods. 2. According to statistical judgement, probable rainfall intensity formula of Japanese type($I={\frac{a}{t+b}}$, see Table-6) shows the most proper one among other types of formula like Talbot type, Sherman type and Characteristic coefficient method. Probable rainfall in tensity value of Japanese type in Daejeon area shows well coincidence with the one obtained by applying prof. Park's n-coefficient to Monobe formula $I=({\frac{R_{24}}{24}})({\frac{T}{t}})^{0.5486}$. On the other hand, the value by Monobe formula with n-coefficient of 2/3 which is being used as a disign criterison by M. O. C. shows large difference from the fore-mentioned results (see Table-7). Consequently the value by Monobe formula might be judged that it is too much overestimated one as a design criterion. 3. Short-term runoff in small water shed could be calculated more reasonably in Daejeon area through this probable rainfall in tensity formula.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.20 no.3
• /
• pp.535-543
• /
• 2019

This study was conducted to identify the factors related to the patient demographics and smoking factors on smoking cessation success and maintenance of subjects at the 6th and 12th week at a public hospital. This study utilized secondary data collected through the smoking cessation program of the 2014 public health care program, which is mediated for 6 weeks and checked for maintenance on the 12th week. The data were analyzed by the chi-square test, t-test and logistic regression analysis. There were 90 subjects in total, 85 men (94.45%) and 5 women (5.55%). The smoking success group and smoking failure group showed significant differences in family type (${\chi}^2=4.496$, p=0.037), education (${\chi}^2=12.253$, p=0.002), smoking amount per day before program (t=-2.906, p=0.005), and nicotine dependence before program (t=-3.081, p=0.003) after 6 weeks. Factors influencing smoking cessation success were religion (OR=3.719, 95% CI=1.076-12.859) and nicotine dependence before program (OR=0.713, 95% CI=0.520-0.976). Factors influencing smoking cessation maintenance were family type (OR=0.017, 95% CI=0.001-0.507) and no-smoking willingness (OR=2.062, 95% CI=1.059-4.015). For smoking cessation to be successful and sustainable, it is necessary to develop programs specific for the characteristics of the subjects; accordingly, continuous research and support are needed.

• Korean Journal of Psychosomatic Medicine
• /
• v.26 no.1
• /
• pp.1-8
• /
• 2018

Objectives : This study aimed to investigate the psychosocial characteristics of functional gastrointestinal disorder (FGID) in patients with psychiatric disorders. Methods : This study was conducted with 144 outpatients visiting the psychiatric clinic at a university hospital. FGIDs were screened according to the Rome III questionnaire-Korean version. Demographic factors were investigated, and psychosocial factors were evaluated using the Hospital Anxiety Depression Scale, Patient Health Questionnaire-15, Childhood Trauma Questionnaire-Korean, and State-Trait Anger Expression Inventory. Chisquared test and student's t-test were used as statistical analysis methods. Results : There were differences in education level between two groups divided according to FGID status (${\chi}^2=10.139$, p=0.017). Comparing the psychiatric disorder by FGID group, irritable bowel syndrome (IBS) group showed significant differences (${\chi}^2=11.408$, p=0.022). According to FGID status, IBS group showed significant differences for anxiety (t=-3.106, p=0.002), depressive symptom (t=-2.105, p=0.037), somatic symptom (t=-3.565, p<0.001), trait anger (t=-3.683, p<0.001), anger-in (t=-2.463, p=0.015), and anger-out (t=-2.355, p=0.020). Functional dyspepsia group showed significant differences for anxiety (t=-4.893, p<0.001), depressive symptom (t=-3.459, p<0.001), somatic symptom (t=-7.906, p<0.001), trait-anger (t=-4.148, p<0.001), state-anger (t=-2.181, p=0.031), anger-in (t=-2.684, p=0.008), and anger-out (t=-3.005, p=0.003). Nonerosive reflux disease group showed significant differences for anxiety (t=-4.286, p<0.001), depressive symptom (t=-3.402, p<0.001), somatic symptom (t=-7.162, p<0.001), trait anger (t=-2.994, p=0.003), state anger (t=-2.259, p=0.025), anger-in (t=-2.772, p=0.006), and anger-out (t=-2.958, p=0.004). Conclusions : Patients with psychiatric disorders had a high prevalence of FGID, and various psychosocial factors contributed to such differences. Therefore, the psychiatric approach can offer better understandings and treatments to patients with FGID.