• Journal of the Korean Data Analysis Society
• /
• v.20 no.6
• /
• pp.2873-2881
• /
• 2018

It is very important to obtain objective and credible information through election polls in order to contribute to the correct voting behavior of the voters or to establish appropriate election strategies for candidates or political parties. Therefore, many related organizations such as political parties, media organizations, and research institutions have been making efforts to improve the accuracy of the results of the polls and the election prediction. Kim et al. (2017) analyzed whether the non-response group responded that there is no support candidate in the election survey to increase the accuracy of the estimation of the vote rate. As a result, it has been confirmed that the accuracy of the estimation of the vote rate can be significantly improved by performing an appropriate classification on the non-response layer. In this study, we propose a method to estimate the turnout by each strata (sex, age group) under the condition that the total turnout rate is given for a specific district (region) and propose a procedure to predict the vote rate by reflecting the turnout. In addition, case studies were conducted using data gathered through telephone interviews for the 20th National Assembly elections in 2016.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.28 no.3D
• /
• pp.363-369
• /
• 2008

Change is inevitable and is a reality of construction projects. Change adjustment includes the cost associated with materials, labor, etc. However, the actions of a contractor can cause a loss of productivity and furthermore can result in disruption of the whole project because of a cumulative or ripple effect. Because of its complicated nature, it becomes a complex issue to determine the cumulative impact (ripple effect) caused by single or multiple change orders. Furthermore, owners and contractors do not always agree on the adjusted contract price for the cumulative impact of the changes. What is needed is a reliable method to identify and quantify the loss of productivity caused by cumulative impact of change orders. This study survey the change orders data in domestic area for public construction and analyze to quantify change order impact. This study developed concepts of "%CO", "%Delta", "%T" to capture change order effect on project and search the relationships between them. Finally, this study find strong relationship between change order and loss.

• Journal of Korean Home Economics Education Association
• /
• v.25 no.1
• /
• pp.119-135
• /
• 2013

This Exploratory study applied the content analysis method by documental research to develop the logic of announcing a validity of Korean Education or Home Economics Education's roles and missions for preventing the school violence. As the results, three logics of accessing devices for Korean Education or Home Economics Education got developed. First, adolescents should be changed into an positive perspective like a 'people living' rather than a negative perspective like the 'learner' which is limited in Korean Education. Second, the value of the 'life competency' which has been disparaging is reinforced as an important value of education although the purpose of Korean Education was only one. The life competency is not a talent which is learned naturally by experiences. Because the school violence which is a problem in nowadays is a problem occurred by adolescents as the 'people living' rather than the 'learner', it is needed to renovate an education by a curriculum of reinforcing the 'life competency'. Third, Home Economics Education has been traditionally the typical subject which had a purpose of varied competency development as the 'people living'. Thus, the subject of Home Economics Education is one of the most important subjects, being able to prevent the school violence in entire Korean Education. The Home Economics Education as the 'life education' has an essence for making adolescents have needed competency to achieve a qualified and happy life over their adjustment.

• Fire Science and Engineering
• /
• v.30 no.4
• /
• pp.1-5
• /
• 2016

This research performed tests of Video Fire Detector and criteria of installation to make suggestions regarding the criteria that must be reflected in NFSC 203 by comparing the standards of FM Approvals, UL, ISO7240 and NFPA 72. FM Standard related to Video Fire Detector test has been classified as Smoke, Flame type, but the UL Standard has classified only as a Smoke type. This research examined 6 cases of fire phenomenon detection case in ISO 7240 and 3 cases in NFPA 72, respectively. There are 15 items required for the installation standard of a Video Fire Detector and each field standard is presented as a per installation method. To apply a Video Fire Detector, the pertinent items (the definition of term, detector's classification, structure and function among its test item) must be inserted. In addition, 7 items of the fire test, i.e., the sensitivity adjustment, prevent false alarm, ambient temperature test, the effective sensitivity and detection distance and viewing angle, aging test, flood test, must be applied to the actual test. For installation in the field, the operation environment and levels of illumination, and NFSC 203 must be set, and standards relevant to the sound system, indicators' installation distance, etc. need to be inserted.

• Journal of the Korean Data and Information Science Society
• /
• v.26 no.6
• /
• pp.1439-1452
• /
• 2015

Purpose: The purpose of this study was to construct a SEM that would further explain the college adaptation for nursing students. Methods: Model construction was based on the variables; mother attachment, self concept, stress, stress of clinical practice, psychological well-being, coping, and college adaptation. The analysis of data was done with both SPSS 20.0 for descriptive statistics and AMOS 20.0 for SEM. Results: The psychological well-being and coping was found to have a significantly direct effect in predicting college adaptation. In addition, mother attachment, self concept, and stress were found to have a significantly direct effect in predicting college adaptation. The final modified model yielded ${\chi}^2=231.1$ (p <.001), ${\chi}^2/df=2.36$, GFI=.91, AGFI=.86, NFI=.91, PNFI=.73 RMSEA=.07, and CFI=.95. Conclusion: To improve adjustment to college life, it is recommended to have a direct method of developing psychological well-being and coping improvement program to improve mother attachment.

• The Korean Journal of Financial Management
• /
• v.7 no.1
• /
• pp.1-20
• /
• 1990

In most of studies on market efficiency, the stability of risk measures and the normality of residuals unexplained by the pricing model are presumed. This paper re-examines stock splits, taking the possible violation of two assumptions into accounts. The results does not change the previous studies. But, the size of excess returns during the 2-week period before announcements decreases by 43%. The results also support that betas change around announcements and the serial autocorrelation of residuals is caused by events. Based on the results, the existing excess returns are most likely explained as a compensation to old shareholders for unwanted risk increases in their portfolio, or by uses of incorrect betas in testing models. In addition, the model suggested in the paper provides a measure for the speed of adjustment of the market to the new information arrival and the intensity of information contents.

• Journal of Internet Computing and Services
• /
• v.21 no.6
• /
• pp.1-12
• /
• 2020

Low-Orbit satellite mobile networks can provide services through miniaturized terminals with low transmission power, which can be used as reliable means of communication in the national public disaster network and defense sector. However, the high traffic environment in the emergency preparedness situation increases the new call blocking probability and the handover failure probability of the satellite network, and the increase of the handover failure probability affects the QoS because low orbit satellites move in orbit at a very high speed. Among the channel allocation methods of satellite communication, the FCA shows relatively better performance in a high traffic environment than DCA and is suitable for emergency preparedness situations, but in order to optimize QoS when traffic increases, the new call blocking and the handover failure must be minimized. In this paper, we propose LEO-DBC (LEO satellite dynamic beam width control) technique, which improves QoS by adaptive adjustment of beam width of low-orbit satellites and call time of terminals by improving FCA-QH method. Through the LEO-DBC technique, it is expected that the QoS of the mobile satellite communication network can be optimally maintained in high traffic environments in emergency preparedness situations.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.26 no.6
• /
• pp.54-63
• /
• 2022

This paper is a study on the friction damper, which is one of the seismic reinforcement devices for structures. This study developed a damper by replacing the internal friction material with ultra high molecular weight polyethylene (UHMWPE), a type of composite material. In addition, this study applied a multi-friction method in which the internal structure where frictional force is generated is laminated in several layers. To verify the performance of the developed multi-friction damper, this study performed a characteristic analysis test for the basic physical properties, wear characteristics, and disc springs of the material. As a result of the wear test, the mass reduction rate of UHMWPE was 0.003%, which showed the best performance among the friction materials based on composite materials. Regarding the disc spring, this study secured the design basic data from the finite element analysis and experimental test results. Moreover, to confirm the quality stability of the developed multi-friction damper, this study performed an seismic load test on the damping device and the friction force change according to the torque value. The quality performance test result showed a linear frictional force change according to the torque value adjustment. As a result of the seismic load test, the allowable error of the friction damper was less than 15%, which is the standard required by the design standards, so it satisfies the requirements for seismic reinforcement devices.

• Korean Journal of Social Welfare Studies
• /
• v.41 no.1
• /
• pp.307-343
• /
• 2010

This study, based on grounded theory, explores the child-rearing process of defecting North Korea women in South Korea. Interviews were conducted with five defecting North Korea women who had children. With the permission of the participants, the interviews were recorded with the digital recorder and transcribed by the researchers. Data were collected with in-depth interviews and observations until they were saturated. The interviews were analysed according to the constant comparative method used in grounded theory. The study derived 86 concepts, 31 subcategories and 11 categories in open coding. A core category was 'enduring hardships with hopes for children's success ' in selective coding. And The child-rearing process of the defecting North Korea women takes 'stage of entry', 'stage of confrontation', 'stage of struggle', 'stage of adjustment' and 'stage of hope for children's success'. The findings of the study will be useful in seeking an effective social welfare intervention plan for successful child-rearing of defecting North Korea women in South Korea.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.8 no.1
• /
• pp.181-189
• /
• 2013

This study was conducted to provide basic data in establishing a method for helping adolescents form the concept of correct oral health knowledge, by searching for their misconceptions about oral health knowledge and figuring out relevant factors. Results showed that they had appropriate knowledge on a relatively large number of questions regarding the level of oral health knowledge, but they also had misconceptions about the toothbrush grip, how to use medicines for gum diseases, and the project of fluorine concentration adjustment in water. It was shown that the score of oral health knowledge turned out to be 10.78 on average as a whole and the mean difference was within the error range. As for the correlations of misconceptions about oral health knowledge by group, it was noted that there were no differences in gender and education level, but those who completed oral health education had more appropriate concepts than those who did not (p < 0.001). In terms of the paths that they obtained oral health knowledge, the Internet and mass media (35.4%) had the highest rate and school (9.6%) had the lowest rate. With regards to the level of oral health knowledge, school had 10.56, which was the lowest score. In this regard, in order for adolescents to form adequate oral health knowledge, the following should be done. therefore, it would be necessary to activate school oral health education so as for adolescents to exercise adequate oral health behavior and to train many oral health educators so as for them to be provided with more educational opportunities.