• KSCE Journal of Civil and Environmental Engineering Research
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• v.35 no.4
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• pp.897-905
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• 2015

This research suggested the traffic signal calculation model of active transit signal priority using a shockwave model. Using this signal priority timing optimization model, the shockwave area is computed under the condition of Early Green and Green Extension among active transit signal priority techniques. This study suggested the speed estimation method of backward shockwave using average travel time and intersection passing time. A shockwave area change is calculated according to signal timing change of transit signal priority. Moreover, this signal timing calculation model could determine the optimal signal priority timings to minimize intersection delay of general vehicles. A micro simulation analysis using VISSIM and its user application model ComInterface was applied. This study checked that this model could calculate the signal timings to minimize intersection delay considering saturation condition of traffic flow. In case studies using an isolated intersection, this study checked that this model could improve general vehicle delay of more over ten percentage as compared with equality reduction strategy of non-priority phases. Recently, transit priority facilities are spreading such as tram, BRT and median bus lane in Korea. This research has an important significance in that the proposed priority model is a new methodology that improve operation efficiency of signal intersection.

• Progress in Medical Physics
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• v.18 no.3
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• pp.126-133
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• 2007

A head-and-neck phantom was designed in order to evaluate remotely the quality of the delivery dose of intensity modulated radiation therapy (IMRT) in each institution. The phantom is homogeneous or inhomogeneous by interchanging the phantom material with the substructure like an air or bone plug. Monte Carlo simulations were executed for one beam and three beams to the phantom and compared with ion chamber and thermoluminescent dosimeter (TLD) measurements of which readings were from two independent institutions. For single beam, the ion chamber results and the MC simulations agreed to within about 2% TLDs agreed with the MC results to within 2% or 7% according to which institution read the TLDs. For three beams, the ion chamber results showed -5% maximum discrepancy and those of TLDs were $+2{\sim}+3%$. The accuracy of the TLD leadings should be increased for the remote dose monitoring. MC simulations are a valuable tool to acquire the reliability of the measurements in developing a new phantom.

• Korean Journal of Clinical Laboratory Science
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• v.49 no.3
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• pp.233-238
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• 2017

This study was conducted to investigate the relationship between body fat content and serum lipids in college students. A total of 61 (15 males and 46 females) students of W university in Iksan, between June 2015 and July 2015, were enrolled for analysis. The relationship of serum lipid with BMI, and body fat percent measured by impedance fat meter (InBody 520) was analyzed. The study population was divided into three groups according to the InBody 520's guideline. Group I accounted for 26.7% of men and 10.9% of women. Weight and BMI were significantly different among the three groups in men and women (p<0.05); whereas height was not. In men, serum total cholesterol, triglyceride, low density lipoprotein cholesterol, and hemoglobin were significantly different between the three groups (p<0.05). Conversely, in women, serum total cholesterol, low density lipoprotein cholesterol, and alanine transferase were significantly different between the three groups (p<0.05). However, there were no differences in other variables between the three groups. BMI was significantly different among three groups in both men and women (p<0.05). In men and women, body fat percent was correlated with BMI, weight, total cholesterol, and low density lipoprotein cholesterol. Multiple regression analysis on total cholesterol indicates that body fat percent, BMI, and hemoglobin were not significantly independent variables in men and women. This study showed that body fat percent was significantly associated with other obesity markers and serum lipids.

• Journal of radiological science and technology
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• v.38 no.2
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• pp.115-120
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• 2015

To study the differences of focal liver lesion image detection at 3 minute, 10 minute and 15 minute time points on gadoxetic acid (GA)'s enhanced MR imaging with a flip angle (FA) of $30^{\circ}$ compared with a $11^{\circ}$. The subjects were 69 patients evaluated with GA enhanced MR imaging with 3.0T MR scanner. The patients are total 35(23 men and 7 women at the mean age of 60.4 years), hepatocellular carcinoma(23) and metastsis(12) except for normal, cyst and hemangioma. After GA was injected, FA $11^{\circ}$ and $30^{\circ}$ images were obtained at 3 minute, 10 minute and 15 minute time points respectively. After quantitative and qualitative assessment of each image was done, statistical analysis was performed by using the independent sample T-test. From both quantitative and qualitative assessment of 3 minute and 10 minute MR images after the injection of GA, FA $30^{\circ}$ images was found to be superior than FA $11^{\circ}$, but there were no statistical significance. However, at 15 minute time point, Statistically significant FA $30^{\circ}$ image(p<0.05) was better than FA $11^{\circ}$ therefore, the FA $30^{\circ}$ improves the focal liver lesion detection. FA $30^{\circ}$ of MR image can detect liver lesion more sensitively than the existing $FA11^{\circ}$ image after GA contrast enhancement at 15 minute time point.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.3
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• pp.364-375
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• 2018

This study was a descriptive investigation to identify the influence of nurses' moral sensitivity and safety of their environment on compliance with standard precautions. Participants consisted of 214 nurses in one general hospital and data were collected using a questionnaire that consisted of moral sensitivity, safety of environment and compliance with standard precautions from 1-15 August 2017. Data were evaluated by the independent t-test, ANOVA, Pearson's correlation coefficient, and multiple regression analysis. The mean scores of moral sensitivity, safety of environment and compliance with standard precautions were 5.05, 5.76 and 4.50, respectively. Moreover, compliance with standard precautions was significantly positively correlated with moral sensitivity and safety of environment. Additionally, multiple regression revealed an $R^2$ of 0.253 with the department (ER, ICU), age and safety environment serving as the major predictor variables for compliance with standard precautions. However, the influence of moral sensitivity on compliance was not identified. Therefore, to increase compliance with standard precautions among nurses, it is necessary to provide continuous educational programs for new nurses, customized programs considering departmental characteristics and administrative support of institutions to enhance safety of the environment.

• Journal of the Korean Institute of Landscape Architecture
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• v.46 no.3
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• pp.103-116
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• 2018

The Park Act (1967~1980) was the first law to define urban parks in Korea. The urban parks of that time were similar to a reservation area used for other purposes after giving regulation. Because 'the urban park as a reservation area' in the past is a repeated park issue in the present, it is necessary to consider the issues of the original law system that created the cause. From this perspective, this study analyzed the legislation to reserve an urban park by collecting bills and information about the factual relationship between 1960 70s park issues and the Park Act. Analysis showed that the reason for the adoption of different kinds of urban parks in the law of a nature park is that a negative list separated from the Urban Planning Act is required to curb private usage. Inherent in the Park Act, however, was the problem of allowing the encroachment of urban parks by governmental power. (1) The Park Act sets out a wide range of cases to abolish urban park. (2) Unclear setting of governmental power could abuse the urban park. (3) Insufficient standards were able to erode the urban park with large for-profit facilities. (4) The inactivity of the Urban Public Park Committee had reduced democratic decision-making and professional judgement on park issues. Therefore, the Park Act was characterized as infringing on the environment and right to urban parks and took a passive attitude in creating parks and in citizen usage thereof. The Park Act had limitations as a progenitor for establishing the characteristics and concepts of urban parks.

• The Journal of the Korea Contents Association
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• v.14 no.5
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• pp.211-223
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• 2014

The aim of this study was to identify the levels of family members' burden and to describe factors influencing on famiCX*//8ly caregiver's burden when they are planned to transfer to general ward from the intensive care units (ICU). A descriptive survey was used with a convenience sampling of 101 family members of ICU patients at S university hospital in C city, Korea from August to November, 2010. The data were analyzed with SPSS 18.0 program. The level of object burden in family members had statistically significant differences with level of consciousness, number of patients' monitoring devices, and tracheostomy tube. The level of subject burden had statistically significant differences according to patients' gender, patients' education level, and relationship with patients. Transfer anxiety was showed statistically positive correlation with objective and subjective burden. We found transfer anxiety was statistically significant predictor of family caregiver's objective burden with explanatory power 12.7%. Family members' subjective burden were statistically influenced by patients' gender and transfer anxiety. These factors explained 23.8% out of total variance of family members' objective burden. The structured individualized method of transfer is recommended with further research of ICU families to further examine the dimension of transfer anxiety and how it affects family members' burden and patient outcomes.

• Korean Journal of Psychosomatic Medicine
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• v.25 no.1
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• pp.33-45
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• 2017

Objectives : The purpose of this study was to examine psychological characteristics of patients who visited psychiatric clinic for medical certificate for military service using MMPI-2-RF. We compared target group with general psychiatric patients with same age range. Methods : A total of 165 male patients for medical certificate and 154 general psychiatric patients were collected from the Department of Psychiatry of three university hospitals. There were significant differences of age and educational level between two groups. We used independent t-test, ANCOVA, ${\chi}^2$ test to examine differences between two groups. Results : Medical certificate group scored higher on the validity scales, the Higher-Order(H-O) scales, the Restructured Clinical(RC) Scales, the Specific Problems(SP) Scales, and the Personality Psychopathology Five (PSY-5) Scales. Especially, EID, RC7, HLP, SFD, SAV, SHY, DSF, and INTR-r showed significant differences between two groups on all three statistical tests. Conclusions : The present study showed that psychiatric patients who received psychological evaluation for military service have significantly higher emotional distress, helplessness, lower self-confidence, and lower quality of interpersonal relationships. And the difference of validity scales between two groups could be related with psychological burden of compulsory military service in the study sample which causes elevation on scales of infrequent responses. MMPI-2-RF would be helpful instrument to assess these emotional and psychological characteristics.

• Environmental and Resource Economics Review
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• v.18 no.1
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• pp.53-73
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• 2009

This study examines the existence of ${\beta}$-convergence of carbon dioxide emissions in 24 countries over the period 1971~2002. For that purpose, The model of economic growth developed by Barro and Sala-i-Martin (1995) is extended and conducted Dynamic panel analysis and unit root testing by employing the panel stationarity test of Levin et al. (2002) and 1m et al. (2003). A dynamic panel estimation is well known method including capacity to control for both the endogeneity problem and the unobserved country-specific effects problem. Dynamic panel estimation method has been widely used in similar empirical studies. therefore, we also used the dynamic panel estimation method in our estimation. The result show that evidence of ${\beta}$-convergence exists among both the Obligatory GHG reduction countries (Annex) and the Non-obligatory GHG reduction countries (Non-Annex). but China discharge amount of $CO_2$ gas more than any other country. This fact can cause some bias in overall test. and so we reexamined test of convergence for Non-annex countries excluding china. As expected, in the Non-annex countries excluding china, I couldn't find any evidence of convergence.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.10 no.5
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• pp.469-475
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• 2017

Software reliability is one of the most basic and essential problems in software development. In order to detect the software failure phenomenon, the intensity function, which is the instantaneous failure rate in the non-homogeneous Poisson process, can have the property that it is constant, non-increasing or non-decreasing independently at the failure time. In this study, was compared the reliability performance of the software reliability model using the Landely lifetime distribution with the intensity function decreasing pattern and Erlang lifetime distribution from increasing to decreasing pattern in the software product testing process. In order to identify the software failure phenomenon, the parametric estimation was applied to the maximum likelihood estimation method. Therefore, in this paper, was compared and evaluated software reliability using software failure interval time data. As a result, the reliability of the Landely model is higher than that of the Erlang distribution model. But, in the Erlang distribution model, the higher the shape parameter, the higher the reliability. Through this study, the software design department will be able to help the software design by applying various life distribution and shape parameters, and providing software reliability attributes data and basic knowledge to software reliability model using software failure analysis.