• Journal of Environmental Policy
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• v.7 no.3
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• pp.121-140
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• 2008

The impervious cover ratio has been used as an important measure for tracing water environment characteristics in watershed. Impervious cover is divided into total impervious cover and effective impervious cover, and its size varies depending on the land use characteristics of a watershed. Total impervious cover can be easily measured using existing land use maps or land cover map, while it takes a considerable amount of time and labor to measure the effective impervious cover, as water flow should be identified at each site. This study is intended to calculate the total impervious cover and effective cover of a sample site, compare their characteristics, and find a method to apply effective and total impervious cover ratios toward watershed management. The analysis of the sample site showed that the effective impervious cover rate(39.7%) was less than the total impervious cover rate(43%). This suggests that it would be acceptable, in terms of time and cost, if total impervious cover is applied as the representative impervious cover ratio of a watershed considering that it was used as basic data to analyze the effect that impervious cover has on the water environment.

• Journal of the Korean housing association
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• v.22 no.4
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• pp.133-142
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• 2011

The purpose of this study was to gather baseline data to be used for improving housing environments and developing welfare policies for low-income groups by identifying the similarities and differences in housing environmental conditions and in the usages of community welfare services between the dwellers of Da-Ka-Gu rental housing and those of permanent rental apartment. This multifaceted diagnosis currently being undertaken can be utilized through the lowincome housing planning and welfare policies as the basis for future policy formulation. Self-administered questionnaires and interviews were carried out by 212 dwellers in Da-Ka-Gu rental housing (104) and permanent rental apartments (108) in the city of Gwangju from July to October of 2010. The main findings are as follows: 1. The dwellers living in both Da-Ka-Gu rental housing and permanent rental apartments are satisfied with their housing environment. Specifically, a higher satisfaction with transportation and a lower satisfaction with neighbor's inter-relationships were evident. The dwellers of Da-Ka-Gu rental housing appear to be more satisfied with community spaces and housing management than those of the permanent rental apartments, whereas the latter appear to be less satisfied with the noise of the housing complex than the former. 2. Of the community welfare service programs, a higher usage is shown for meals service, free health screenings, home repair, and after-school learning programs among all residents in the two housing types. In particular, for the residents of Da-Ka-Gu rental housing, the children's education and parent education programs are more popular, whereas for those of the permanent rental apartments, the housekeeping services and health services utilization are highest.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.3
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• pp.1225-1234
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• 2013

According to the importance of greenhouse gas emissions, it grows day by day, the goverment is promoting to prepare the specific policy implementation to enhance building energy-saving design standars as the development agenda. In this study, the statistical analysis was performed by Descriptive statistics, Regression analysis, and Hypothesis testing to collect to generate and storage energy usage data in real time to settle parameter setting to affect energy consumption under energy-guzzling apartment not single building. This study is expected to be utilized as the basis for the optimum energy-saving design of the future of the building or facility energy costs rise and the demand for energy-efficient and stable management.

• Journal of Korea Port Economic Association
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• v.18 no.1
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• pp.3-26
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• 2002

The purpose of this paper is to Investigate the productive efficiency and competitive strength of world container ports using the DEA, Super-efficiency, and FDH methods with the raw data from previous research by Jun et al.(1993). The super-efficiency measure examines the maximal radial change In input, outputs for an observation to remain efficient. Therefore, it provides a means of distinguishing between efficient observations, which would otherwise seem identical. FDH provides a good test mechanism for examining the practical implications of the choice available among alternative efficiency measures and orientations, because of the lack of convexity of its production possibility set. Both methods are complementary to DEA. This paper follows the traditional productivity analysis method overcoming the limitation of previous studies by using the DEA, FDH and Super-efficiency methods, and proposing in measure the relative competitive strength of worldwide container ports. The main empirical results of this paper are as follows: Firstly the ports of Singapore, Hongkong, Kilrung, Busan, Tokyo. and Longbeach were found to be efficient In the CCR model. The ports of Felixstowe, Bangkok, Singapore, Hongkong, Kilung, Busan, Tokyo, and Longbeach were found to be efficient in the BCC model. Secondly, super. efficiency rankings under CRS and input-oriented model are as follows: Longbeach, Keelung, Singapore, Busan, Tokyo, and Honkong. However, it was difficult In differenciate the rankings under the VRS and input-oriented model. due to major difficulties posed by the ports of Singapore, Hongkong, and Longbeach. Thirdly, the FDH method shows that the inefficient ports are Bremerhaven, Antwerp, Le Havre, Kobe, Seattle, New York The policy Implications of this study are as follows: Firstly, when port authorities want to measure the international competitive strength of container ports and enhance their productive efficiency, they should consider the traditional method as well as introducing the Super-efficiency and FDH methods. Secondly, according to the analysis results of the super-efficiency and FDH methods, poll authorities should recommend benchmarks ports and dominated ports as reference ports in order to enhance the productive efficiency of their container ports that have an efficiency rating of less than 1. Efficient ports whose efficiency ratings are over 1 in the Input-oriented Super-efficiency model should also consider the usage of input and output elements used by more efficient ports.

• Journal of Digital Convergence
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• v.14 no.9
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• pp.53-61
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• 2016

This study aimed to understand the effectiveness of teachers' backgrounds and digital textbook training experiences on digital competency, understanding of the digital textbook, perception of the digital textbook effectiveness and attitude toward the digital textbook. A total of 101 valid elementary, middle and high school teachers participated in the survey and the data were analyzed using the SPSS statistical package. As a result, male teachers showed higher digital competency than female teachers. Also, teachers who experienced with digital textbook training understood more about the digital textbook. It was suggested that a newly structured professional development program for the digital textbook considering teachers' personal backgrounds should be developed.

• Journal of Digital Convergence
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• v.18 no.1
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• pp.321-332
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• 2020

The purpose of this study was to identify relationships among level of e-Health literacy, subjective health status and health-seeking behaviors. Subjects were 102 senior citizens who used the internet at least once in the last month and visited elderly community centers and welfare centers. Collected data were analyzed descriptive statistics, t-test, ANOVA, Pearson's Correlation Coefficient, and Multiple Regression using SPSS version 25.0. Fifty five percent of subjects responded the average weekly internet usage hours was 'less than 3 hours', The e-health literacy (r=.349, p<.001) and subjective health status (r=.466, p<.001) were positively correlated with health seeking behavior. Subjects' gender (β=.22, p=.012), type of disease (β=.23, p=.013) and subjective health status (β=.38, p<.001) had significant effects on health-seeking behaviors. The results suggest that the development of intervention programs to increase the level of e-Health literacy and subjective health status to improve of their health-seeking behaviors.

• Journal of Digital Convergence
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• v.18 no.7
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• pp.149-156
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• 2020

This study investigated the key factors affecting online relational intimacy in the context of SNS. Based on the use and gratification theory, self-presentation, relationship formation and information searching were identified as the main needs of SNS usage. These needs were expected to influence online relational intimacy through user satisfaction, subjective well-being, and disclosing information behaviors. The theoretical framework was validated by a longitudinal method. Hypotheses were tested by using the partial least squares to data from 199 Facebook users. Self-presentation and information searching had a significant impact on both user satisfaction and subjective well-being. However, relationship formation did not significantly affect both user satisfaction and subjective well-being. User satisfaction had a significant direct effect only on online relational intimacy. Subjective well-beings played a significant role in enhancing both disclosing information behaviors and online relational intimacy. Finally, it has been found that disclosing information behaviors are a key factor in enhancing online relational intimacy. The results of this study are expected to provide academic and practical implications for the key antecedents of online relational intimacy.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.3
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• pp.65-87
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• 2018

The user satisfaction of environmental facilities, collection, library services including webpage, etc. by using KSDC program provided by Korea Social Science Data Center has been analysed in this study. Also, the undergraduate students using P-academic library on December 2017 were sampled and analysed in this study. ANOVA etc. were used for testing wether gender, academic level and major of students affect the satisfaction, and Pearson correlation coefficient was used for testing the relation among the variables in the attached questionnaire. The major conclusions of this study are: (1) The policy development for the library use of male undergraduate students is needed. (2) The special counterplan to improve the user accessibility is needed. (3) Also, environmental facilities is absolutely needed when planning to improve user satisfaction. Besides, the development plan prepared after analysing the user opinions in essay form was suggested in this paper, too.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.571-574
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• 2005

XCAP(XML Configuration Access Protocol) which has been proposed in IETF is based on both XML and HTTP protocol. XCAP server maintains user's configuration information for specific application which is described by XML. This protocol can be applied to many application servers for adapting user's preferences. There can be many way to interwork with other application servers. In this paper, we will talk about the experience of designing and implementation of XCAP server and the way of interwork with application servers.

• Journal of Internet Computing and Services
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• v.22 no.2
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• pp.11-17
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• 2021

Software-defined networking provides a programmable and flexible way to manage the network by separating the control plane from data plane. However, the limited switch memory restricts the number of flow entries in the flow table used to forward packets. This leads to flow table overflow and flow entry reinstallation, which severely degrade the network performance. Therefore, this paper proposes a comprehensive policy for timely eviction of inactive flow entries to optimally maintain flow tables usage. In particular, statistics of user datagram protocol flow entries are periodically sampled to enable the inactive entries to be evicted early. Through traffic-based experiments, we found that the proposed system reduces the number of overflow occurrences and flow entries reinstallation compared to the random and FIFO policies.