• The Transactions of the Korea Information Processing Society
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• v.13 no.2
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• pp.48-59
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• 2024

As functions that support virtualization on their own in hardware are developed, user applications having various workloads are operating efficiently in the virtualization system. SR-IOV is a virtualization support function that takes direct access to PCI devices, thus giving a high I/O performance by minimizing the need for hypervisor or operating system interventions. With SR-IOV, network I/O acceleration can be realized in virtualization systems that have relatively long I/O paths compared to bare-metal systems and frequent context switches between the user area and kernel area. To take performance advantages of SR-IOV, network resource management policies that can derive optimal network performance when SR-IOV is applied to an instance such as a virtual machine(VM) or container are being actively studied.This paper evaluates and analyzes the network performance of SR-IOV implementing I/O acceleration is compared with Virtio in terms of 1) network delay, 2) network throughput, 3) network fairness, 4) performance interference, and 5) multi-network. The contributions of this paper are as follows. First, the network I/O process of Virtio and SR-IOV was clearly explained in the virtualization system, and second, the evaluation results of the network performance of Virtio and SR-IOV were analyzed based on various performance metrics. Third, the system overhead and the possibility of optimization for the SR-IOV network in a virtualization system with high VM density were experimentally confirmed. The experimental results and analysis of the paper are expected to be referenced in the network resource management policy for virtualization systems that operate network-intensive services such as smart factories, connected cars, deep learning inference models, and crowdsourcing.

• Information Systems Review
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• v.26 no.1
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• pp.337-353
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• 2024

The purpose of this study is to investigate the relationship between consumer reviews and managerial responses, aiming to explore the necessity of webcare for efficiently managing consumer reviews. We intend to propose a methodology for effective webcare and to construct a webcare model using machine learning techniques based on an audiobook platform. In this study, we selected four audiobook platforms and conducted data collection and preprocessing for consumer reviews and managerial responses. We utilized techniques such as topic modeling, topic inconsistency analysis, and DBSCAN, along with various machine learning methods for analysis. The experimental results yielded significant findings in clustering managerial responses and predicting responses to consumer reviews, proposing an efficient methodology considering resource constraints and costs. This research provides academic insights by constructing a webcare model through machine learning techniques and practical implications by suggesting an efficient methodology, considering the limited resources and personnel of companies. The proposed webcare model in this study can be utilized as strategic foundational data for consumer engagement and providing useful information, offering both personalized responses and standardized managerial responses.

• Korean Journal of Childcare and Education
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• v.11 no.2
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• pp.39-57
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• 2015

The purpose of this study was to identify the influence of private kindergarten teachers' teacher efficacy and communication competence on their job stress. The subjects in this study were 161 private kindergarten teachers working in kindergartens in Gyeong-gi province. For the research analysis, frequency, Cronbach's ${\alpha}$ coefficient, and Pearson's correlation were calculated and regression analysis were conducted. The results are as follows. Firstly, it was revealed that personal teacher efficacy does have statistically meaningful negative influences on job stress as a whole as well as the sub-factors of job stress, but general teacher efficacy has meaningful negative influences only on the personal-related stress of the sub-factors. Secondly, communication competence has statistically meaningful negative influences on job stress as a whole as well as the sub-factors of job stress. Through this study, it is possible to provide a basic guideline to configure the subject content that enhance teacher efficacy and make them give full play to communication competence and develop a positive attitude for coping with job stress in a curriculum for private kindergarten teachers.

• Korean Journal of Childcare and Education
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• v.11 no.1
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• pp.191-208
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• 2015

The purpose of this study was to identify the relationship among beginning early childhood teachers' stress coping strategies, role performance, and self leadership. The subjects in this study were 491 beginning early childhood teachers working in kindergarten and child care centers across the country. Stress coping strategies questionnaire(Chang-Soon Park, 2005) and role performance questionnaire(Bog-Mae Park, 2011), and self-leadership questionnaire(Dong-Hyen Park,2014) were used for this study. For the research analysis, frequency, Cronbach's ${\alpha}$ coefficient, and Pearson's correlation were calculated and regression analysis were conducted. The results are as follows. Firstly, it was revealed that passive stress coping strategies does not have statistically meaningful influences on role performance, but active stress coping strategies have statistically meaningful positive influences on role performance. Also, 491 beginning early childhood teachers' active stress coping strategies have statistically meaningful positive influences on role performance through the mediation of self leadership. That is, the results explain that the higher the self-leadership of beginning early childhood teachers is, the higher the role performance that they have experienced is. It shows that beginning early childhood teachers'self leadership mediates partially between active stress coping strategies and role performance. Through this study, it is possible to provide basic information to configure the subject content that enhance their self-leadership and develop active stress coping attitudes in a curriculum for beginning early childhood teachers.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.7
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• pp.459-465
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• 2017

The Korean language major is being activated in line with the increasing number of international students who are studying in South Korea. Therefore, the motivation for selecting a university major varies according to the background, environment, and values of each student. Thus, it is meaningful to examine the motivation of international students to select their major and their satisfaction on the major. In this study, 173 international students living in Seoul were surveyed and the data were analyzed using SPSS 21.0 and AMOS 23.0 to demonstrate the structural relationship between their motivation for selecting the major and their satisfaction about the major. From analysis result, their motivation for selecting a Korean language major were classified into internal and external motivations, and their major satisfaction was classified into perception satisfaction, relationship satisfaction, subject satisfaction, and general satisfaction. Regarding the motivations to select a Korean language major, the level of external motivation was very high, and among the major satisfaction, the level of general satisfaction was the highest. Furthermore, the external and internal motives had significant positive effects on all the categories of major satisfaction, including the perception satisfaction, relationship satisfaction, subject satisfaction, and general satisfaction. This study suggests effective methods to improve the satisfaction of international students about the Korean language major such as the provision of information about and opportunities for employment using their major and the provision of a high quality.

• Journal of the Korean earth science society
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• v.37 no.1
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• pp.62-77
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• 2016

In the early model of plate tectonics, the plate was depicted as a passive raft floating on the convecting mantle and carried away by the mantle flow. At the same time, ridge push at spreading boundaries and drag force exerted by the mantle on the base of lithosphere were described as the dominant driving forces of plate movements. However, in recent studies of plate tectonics, it is generally accepted that the primary force driving plate motion is slab pull beneath subduction zones rather than other forces driven by mantle convection. The current view asserts that the density contrast between dense oceanic lithosphere and underlying asthenosphere is the substance of slab pull. The greater density of oceanic slab allows it to sink deeper into mantle at trenches by gravitational pull, which provides a dominant driving force for plate motion. Based on this plate tectonics development, this study investigated the contents of plate tectonics in high school Earth Science textbooks and how they have been depicted for the last few decades. Results showed that the early explanation of plate movement driven by mantle convection has been consistently highlighted in almost all high school textbooks since the 5th curriculum, whereas most introductory college textbooks rectified the early theory of plate movement and introduced a newly accepted theory in revised edition. Therefore, we suggest that the latest theory of plate tectonics be included in high school textbooks so that students get updated with recent understanding of it in a timely manner.

• Journal of the Korean Data and Information Science Society
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• v.26 no.3
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• pp.695-706
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• 2015

The purpose of this study was to examine the relationship among self-leadership, critical thinking disposition, satisfaction of clinical practice and clinical practice competency of nursing students. Participants were 199 baccalaureate nursing students (3rd and 4th grades) in 2 cities. The data was collected by questionnaires and were analyzed with the SPSS/Win 21.0 program, using descriptive statistics, Pearson's correlation coefficient and multiple regression. Significant positive correlations were among self-leadership, critical thinking disposition, satisfaction of clinical practice and clinical practice competency. The regression model explained 30.4% of satisfaction of clinical practice. The significant predictors of satisfaction of clinical practice were clinical experience, satisfaction of major, self-leadership and critical thinking disposition. The regression model explained 23.7% of clinical practice competency. Health status, self-leadership and critical thinking disposition were factors influencing clinical practice competency. It should strengthen self-leadership and encourage critical thinking disposition to improve nursing students' satisfaction of clinical practice and clinical practice competency.

• Journal of Digital Convergence
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• v.15 no.8
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• pp.423-433
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• 2017

The purpose of this study was to develop a competency model by career type by designing the specified career paths through the analysis of career experience of the athletes in the professional sports field. For this purpose, career types were identified as sports administrators, judges, leaders, sports information analysts, and global sports talents based on literature analysis, career development type and path guide design, experts interviews. Competency candidates were derived from interviews and workshops on experts. In order to finalize the competency model, it was confirmed by completing the feasibility test of experts. As a result, it is divided into common competency, professional competency, and global professional competency. There are 6 common competencies such as global competence, OA utilization, 29 special competencies by 5 career types, and 2 global competencies like sports foreign affairs, job preparation for international sports organization and the sports league federation. Competency definitions and behavioral indicator were developed for all competencies and could be used to diagnose the competency level of sports talents and to establish career development academy programs based on the competency model.

• Journal of the Korean Chemical Society
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• v.56 no.3
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• pp.363-370
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• 2012

The purpose of the study was to classify scientific models in the seventh grade science textbooks of the 2007 revised science curriculum. The three chapters of 'three states of material', 'motion of molecule', and 'change of state and energy' were investigated. There were two types of the scientific model as 'mode of representation' and 'attribute of representation'. The mode of representation was composed of 'action model', 'analogical model', 'symbolic model', and 'theoretical model' and the attribute of representation was composed of 'static model' and 'dynamic model'. The results showed that the action model and the analogical model were used primarily in mode of representation. The dynamic model were widely used in attribute of representation. Area of matters dealt with conception of molecules and aimed for students to understand the arrangement and movement of molecule microscopically about macroscopic state in a daily life. Tis study could help to recognize the limitations of scientific models on current textbooks and offer more useful information in planning lessons and organizing textbooks for the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.1
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• pp.326-337
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• 2020

This study examined the public interest in high school Korean language instruction and the universal design for learning (UDL) using the social big data analysis method. The observations from 10,339 search results led to the conclusion that public interest in UDL was significantly lower than that of high school Korean language instruction. The results of the Big Data Association analysis showed that 17.22% of the terms were found to be related to "curriculum." In addition, a survey was conducted on a total of 330 high school students to examine how their teachers apply UDL in the classroom. High school students perceived computers as the most frequently used technology tool in daily classes (38.79%). Teacher-led lectures (52.12%) were the most frequently observed method of instruction. Compared to the second-year and third-year students, the first-year students appreciated the usage of technology tools and various instruction mediums more frequently (ps<.05). Students were relatively more positive in their response to the query on the provision of multiple means of representation. Consequently, the lesson contents became easier to understand for students with the availability of various study methods and materials. The first-year students were generally more positive towards teachers' incorporation of UDL.