• Journal of Advanced Navigation Technology
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• v.24 no.5
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• pp.438-443
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• 2020

To transfer files between nodes on network based on Ethernet, file transfer protocol (FTP) on TCP/IP and trivial file transfer protocol (TFTP) on UDP/IP are mostly used. Due to the lack of resources (processor, memory and so on) in the embedded system where we generally use for simple works with small firmware like ones; many of the systems implement only UDP/IP for their network stacks. Thus, TFTP is greatly to be preferred. For examples, environmental sensor devices for sensor networks, Boot Loader for general embedded device and preboot execution environment (PXE) boot for PC provide the TFTP. The logic of TFTP is simple for file transmission but, there is Stop-And-Wait problem during the process which occurs long blocking time. In this paper, we propose an algorithm which called QuTFTP(Quick UDP Trivial File Transfer Protocol) to reduce the length of the blocking time and to be compatible with the legacy TFTP.

• The Journal of the Korea Contents Association
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• v.13 no.8
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• pp.229-239
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• 2013

The purpose of this study is to find out the mediation effects of social-support for adolescents' game addiction and school adaptation. For this study, 353 middle school students in the West-Gyungsangnamdo areas were included in the analysis. Setting as covariates, a mediator and extra variables significantly correlated with the criterion variable, regression analysis, SPSS Macro and bootstrapping methods were used to assess the mediation effects of social-support for adolescents' game addiction and school adaptation. The results showed that adolescents highly addicted to games tended to have more difficulty in adapting to school. However, it was found that social-support (mediator) fully mediated the influence of the adolescents' game addiction (predictor) on school adaptation (criterion variable). Based on the results of the analysis, we suggest implications for social work practice to improve how game-addicted adolescents settle down in middle school through increasing social-support - the mediator - and hence bring about a decrease in game addiction among adolescents.

• Journal of Advanced Navigation Technology
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• v.21 no.1
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• pp.78-83
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• 2017

Linux was born under the influence of Unix except for the kernel, Linux was used to bring the Unix system and relevant program package, commands, etc. However, the latest version of Enterprise Linux, RHEL 7 was adopted systemd instead of init to boot program and management services. The adoption of systemd was building its own Linux system, the system only. Also noteworthy point is that given the considerable number of features specific to a particular package and instructions. As Linux has been recognized as a subtype of Unix itself as a catch all this time the turn of the tide in the cloud era and there on their own to try various changes, the start of the adoption of these changes can be called systemd. Linux is the future beyond the confines of Unix is noteworthy not attempt any changes.

• Journal of KIISE:Computing Practices and Letters
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• v.10 no.3
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• pp.259-272
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• 2004

This paper suggests a new security architecture for facilitating secure OSGi service platform environment. The security architecture includes 1) user authentication mechanism, 2) bundle authentication mechanism, 3) key sharing mechanism, and 4) authorization mechanism. The user authentication mechanism supplies SSO(single sign-on) functions which are useful for safe and easy user authentications. The bundle authentication mechanism utilizes both PKI-based and MAC-based digital signatures for efficiently authenticating service bundles. The key sharing mechanism, which is performed during bootstrapping phase of a service gateway, supplies a safe way for sharing secret keys that are required for authentication mechanisms. Finally, the authorization mechanism suggests distributed authorization among service providers and an operator by establishing their own security policies. The main contributions of the parer are twofold. First, we examine several security requirements of current OSGi specification when its security functions can be applied in real OSGi environments. Second, we describe the ways to resolve the problems by means of designing and implementing concrete security mechanisms.

• The Journal of the Korea Contents Association
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• v.20 no.9
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• pp.150-157
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• 2020

This study was conducted to explore whether problem solving ability mediates the effect of flow on the level of task participation in PBL. The subjects of this study were 60 students(in Education methods and technology class). For the study, data were collected through questionnaires on flow, problem-solving ability, and task participation level. Collected data are analyzed using SPSS Macro and bootstrapping method. As a result, the impact of flow was positive on the level of task participation. And the problem solving ability was found to have an indirect effect at the level of .292. Problem solving ability mediates the impact of commitment on the level of participation in the task. The results of these studies are the basis for how to improve the level of participation in the task by supporting problem-solving skills in PBL activities.

• Journal of Digital Convergence
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• v.18 no.5
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• pp.485-495
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• 2020

The purpose of this study was to examine the role of self-esteem (SE) and cooperation (CO) in the effect of parental attitudes (PA) as perceived by children on the quality of peer relationships (PR). To this end, the data of 1299 boys and 1278 girls in 4th grade were analyzed using the Korean Children and Youth Panel Survey data. The correlation analysis, confirmatory factor analysis, structural equation modeling using phantom variables and bootstrapping were performed by using SPSS and AMOS programs. The results of this study are as follows. First, perceived PA had a significant effect on SE, CO, and PR, SE had a significant effect on CO and PR, and CO had a significant effect on PR. Second, the serial multi-mediating model that assumed that SE and CO mediate the relationship between PA and PR was found to be appropriate. These results suggest that it is important to consider the child's self-esteem and cooperation with parenting attitudes to improve the child's peer relationship. Future research and clinical implications were discussed.

• Journal of the Korean Applied Science and Technology
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• v.37 no.5
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• pp.1268-1284
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• 2020

The purpose of this study was to examine mediating effect of emotional intelligence on relationship between nursing students' learning engagement and academic resilience, find whether self-regulation would moderating the relationship between learning engagement and emotional intelligence. The data were collected from 277 nursing students from three colleges in J province and were analyzed with a regression analysis and bootstrapping. As a result of the study, first, the fit of the causal model between learning engagement, emotional intelligence, academic resilience and self-regulation of nursing students was found to be good, and the causal relationship between variables was predicted appropriately. Second, partially mediating effect of emotional intelligence on the path of nursing students' learning engagement affecting academic resilience. Third, self-regulation had moderating effect on learning engagement affecting emotional intelligence. Finally, the significance of this study is that the influence of various variables that can affect the academic resilience of nursing college students was verified, and in order to improve academic resilience, a strategy that considers the subjects' learning engagement, emotional intelligence, and self-regulation.

• KIISE Transactions on Computing Practices
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• v.21 no.2
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• pp.109-114
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• 2015

This paper presents a computational model on the transfer of airborne fine particles to analyze the similarities and influences among the 25 districts in Seoul by quantifying a time series data collected from each district. The properties of each district are driven with the model of a time series of the fine particle concentrations, and the calculation of edge-based weights are carried out with the transfer entropies between all pairs of the districts. We applied a modularity-based graph clustering technique to detect the communities among the 25 districts. The result indicates the discovered clusters correspond to a high transfer-entropy group among the communities with geographical adjacency or high in-between traffic volumes. We believe that this approach can be further extended to the discovery of significant flows of other indicators causing environmental pollution.

• Journal of Digital Convergence
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• v.14 no.1
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• pp.453-463
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• 2016

This study examined the relationship among dropout, organizational trust, and intention to transfer in the department affiliated with Physical Education. Data were collected from 480 students in the department affiliated with Physical Education from 6 institutions of a 4-year university located in Seoul, Gyeonggi-do, Incheon, and ChungChong-do. For the research model analysis, a structural equation model and bootstrapping were conducted. Results indicated that the academic domain, the social domain, and the environmental domain of dropout had a positive effect on organizational trust. But the only the academic domain in the relationship between dropout and intention to transfer affected intention to transfer positively. The social domain and the environmental domain were not statistically significant on intention to transfer. Moreover, organizational trust had a positive effect on intention to transfer. Finally, organizational trust partially mediated the path between the academic domain and intention to transfer. It fully mediated the paths between the social domain and the environmental domain and intention to transfer.

• Journal of Convergence for Information Technology
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• v.10 no.7
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• pp.194-206
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• 2020

This study aims at creating a daily life satisfaction improvement plan by using motivation for seeking need for rehabilitation services and self-efficacy in individuals who returned-to-work and reemployed injured workers. The subjects of this study were 2,642 returnees and 3,742 reemployed individuals who participated in the first to fifth year survey of the first cohort of the Panel Survey of Workers' Compensation Insurance. The analysis checked the mediating effect through the multiple regression analysis and bootstrapping. The result indicated the need for rehabilitation services had negative impact on self-efficacy and daily life satisfaction whereas self-efficacy had a positive effect on daily life satisfaction and played a mediating role between the need for rehabilitation services and daily life satisfaction. Based on these results, a need for the advancement of social psychological rehabilitation program and establishing an integrative rehabilitation process were identified.