• 디지털산업정보학회논문지
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• 제19권3호
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• pp.105-115
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• 2023

This study analyzed the effects of learning participation motivation and collaborative self-efficacy on knowledge sharing behavior in an online learning environment. Collaborative learning in the online learning environment took the initiative in team formation, learning topic selection, learning planning and execution, and reflection. Collaborative learning was operated as an extracurricular program, and a survey was conducted targeting students who finally completed all learning activities. The results of the study are as follows. First, goal-oriented motivation and self-Efficacy for group work, showed significant influence on knowledge sharing behavior. Second, activity-oriented motivation did not show a statistically significant effect relationship. Interpreting the analysis results, it can be judged that the higher the goal-oriented motivation and self-Efficacy for group work of students who performed collaborative learning in an online learning environment, the higher the willingness to share knowledge, skills, and information they know. This study explored the outcomes of collaborative learning conducted in an online learning environment. It is meaningful that the learner's learning participation motivation was identified and the effect of self-Efficacy for group work, which can be expressed in collaborative learning situations, on knowledge sharing behavior, which is a necessary behavior for group performance, is significant.

• 한국컴퓨터정보학회논문지
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• 제14권2호
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• pp.119-128
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• 2009

웹 애플리케이션과 웹 기반 정보 시스템의 이용이 증가하면서 웹 애플리케이션 공격도 증가하고 있다. 다양한 웹 공격 중에 사용자에게 큰 손해를 입힐 수 있는 공격으로 최근에 크로스사이트 요청 변조(Cross Site Request Forgery, XSRF) 공격이 대두되고 있다. 하지만 기존에 개발되어 운영되고 있는 애플리케이션에 이런 공격을 막기 위해 보안 기능을 추가하는 것은 기업이나 조직에 많은 비용과 위험을 초래할 수 있다. 이러한 보안 기능을 레거시(legacy) 시스템에 효과적으로 적용하기 위해 관점 지향 프로그래밍(Aspect-Oriented Programming, AOP)에서 제공하는 모듈화의 장점을 이용하여 관심사(concern)를 분리한다. 본 논문에서는 JEE(Java Enterprise Edition) 환경의 시스템에서 관점 지향프로그래밍의 애스펙트(aspect)를 이용하여 크로스사이트요청 변조 공격을 탐지하고 방어하는 접근방법을 제시한다.

• The Journal of Korean Physical Therapy
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• 제30권4호
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• pp.112-116
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• 2018

Purpose: This study aimed to identify the effects of a task-oriented exercise program on balance in patients with acute stroke. Methods: Twenty participants with hemiparesis resulting from acute stroke volunteered to participate in this study. They were randomly assigned to either the experimental or control group, with 10 patients per group. Both groups underwent a task-oriented exercise program averaging 30 minutes daily for 4 weeks. Balance was assessed before and after the 4-week training period. Before and after the intervention, we conducted a paired t-test to compare the within-group changes and an independent t-test to compare the between-group differences. The statistical significance level was set at p=0.05 for all the variables. Results: Both groups showed significant within-group and between-group changes in balance (p<0.05) after the intervention. Conclusion: This study provides valuable information for future studies in this field. Further research using a larger sample and longer experiment spans can corroborate the results of our study.

• Journal of Information Technology Applications and Management
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• 제12권1호
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• pp.21-34
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• 2005

Object-oriented paradigm has required the fundamental changes in the developers' practice and orientation. However. the relevant literature has not still provided the solid practical methodology but created some myths regarding Use Case modeling. In this study. we attempt to 'demythologize' some key aspects of Use Case Modeling by describing what we have observed in our research and practice. In order to identify the developers' perceptions. the survey methodology was utilized. By discussing the differences between what must be done and what has been done. this study provides rich insights into the better understanding of the Use Case modeling and the successful development of object-oriented systems.

• 한국IT서비스학회지
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• 제13권3호
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• pp.201-219
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• 2014

This paper considers service deployment and priority optimization for multiple service-oriented applications sharing reusable services, which are deployed as multiple instances in the cloud. In order to handle variations in the workloads of the multiple applications, service instances of the individual reusable services are dynamically provisioned in the cloud. Also service priorities for each application in a particular reusable service are dynamically adjusted. In this paper, we propose an analytic performance model, based on a queueing network model, to predict the expected sojourn times of multiple service-oriented applications, given the number of service instances and priority disciplines in individual reusable services. We also propose a simple heuristic algorithm to search an optimal number of service instances in the cloud and service priority disciplines for each application in individual reusable services. A numerical example is also presented to demonstrate the applicability of the proposed performance model and algorithm to the proposed optimal decision problem.

• 한국식생활문화학회지
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• 제26권6호
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• pp.614-620
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• 2011

This study attempted to identify differences in Korean food consumption behaviors between groups of Japanese consumers segmented in accordance to their food-related lifestyles. This study was performed to provide Korean food service companies basic information to implement a strategy for the globalization of Korean food. As a result of the empirical analysis, the food-related lifestyles of Japanese consumers were deduced to the following four factors: "health and safetyoriented lifestyle", "palate and safety-oriented lifestyle", "economic efficiency-oriented lifestyle", and "simplicity-oriented lifestyle". Further, as a result of the cluster analysis, food-related lifestyles were classified into the following three groups: "a group highly interested in food-related life", "an economic efficiency-oriented group", and "a simplicity-oriented group". Second, there were significant differences in demographic characteristics and the characteristics of Korean food consumption behaviors between the groups. Third, also in a comparison of satisfaction with and loyalty to Korean restaurants with crucial attributes during the selection of Korean food, there were significant differences between the groups. Therefore, it is necessary to develop various Korean food products that will cater to Japanese consumers in accordance with each segmented group.

• 한국의류학회지
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• 제28권1호
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• pp.76-87
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• 2004

The purpose of this study was to investigate the differences in adolescents' conspicuous consumption, and their attitude toward and purchasing behaviors for the imported luxuries and the famous brand clothing. A questionnaire survey was conducted to 570 high school students in Seoul; 538 were used for final data analysis. Factor analysis, cluster analysis, $\chi$$^2$-analysis, one-way ANOVA, Duncan's Multiple Range test were used for the statistical analyses. In terms of conspicuous consumption, three factors were formulated: brand and fashion orientation, others orientations, and prize and import orientation. Based on the factor scores, three clusters were identified: the inconspicuous, the others-oriented conspicuous, and the brand-oriented conspicuous. Regarding attitudes toward the products, significant differences were found in all attitudes. The brand-oriented conspicuous showed more favorable attitude toward the products than the other groups. Significant differences were also found in purchasing behaviors except the companions for shopping and purchase time. The brand-oriented conspicuous tended to purchase more, spend more money, prefer department stores, consider brand name and customer service as the most important criteria, and use impersonal informations sources when shopping the products. The other-oriented conspicuous tended to buy bogus products the most, use personal information and consider price and others' perception as important criteria. The inconspicuous were less likely to buy and spend money for the products.

• Journal of Information Technology Applications and Management
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• 제22권1호
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• pp.109-130
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• 2015

This study aims to provide the results of a case study, based on the action research approach, in which an user-oriented management system for enterprise information systems operational performance is successful developed and applied. This study performs the research and summarizes the results by adopting 5-step approach of action research, i.e., diagnosing, action planning, action taking, evaluating and specifying learning. The most important lessons learned from the study include (1) operation performance measures should be established to be shared by the management and users; (2) evaluation and improvement activities should be performed continually; and (3) formula to calculate the measure should be evolved so that improvement initiatives can be identified. The results of the study are expected to provide the companies intending to develop a management system for enterprise information systems operational performance with the practical and useful information. In addition, it is expected to suggest the research results that can be utilized as a basis for future research in this area.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2006년도 춘계학술발표대회
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• pp.1211-1214
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• 2006

유비쿼터스 환경에서 쓰이는 많은 미들웨어 중에서 메시지 기반 미들웨어(MOM: Message oriented Middleware)는 대용량 통신 처리와 비동기 통신, 고가용성으로 인하여 널리 쓰이고 있다. 하지만 이러한 MOM 들은 이벤트 손실에 대한 문제점을 안고 있다. 본 논문에서는 MOM 내에 있는 마스터 큐에서 발생하는 이벤트 손실 문제를 해결하기 위하여 마스터 큐에 이벤트 적재 시간을 조절하는 지연시간을 추가하는 기술을 제안한다. 지연시간은 최적의 값을 계산하기 위해서 다양한 요소들을 변수로 둔다. 그리고 지연시간 추가로 인한 성능저하를 새로운 채널 생성하여 보완한다. 제안하는 방법을 몇 가지 가정을 포함한 시뮬레이션을 통하여 측정, 평가 하였다.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2015년도 제51차 동계학술대회논문집 23권1호
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• pp.259-261
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• 2015

사물인터넷(IoT)은 RFID(Radio-Frequency Identification), 무선, 모바일, 그리고 센서 장치들의 편재성을 증가시킴으로서 유망한 산업 체제 및 응용을 구축할 수 있는 기회를 제공하고 있다. 학계의 활발한 연구 뿐 아니라 최근 몇 년 동안 산업계 또한 사물인터넷을 다양하게 응용하여 개발 및 배포하고 있다. 본 논문은 사물인터넷과 관련된 기술과 서비스 지향 아키텍처를 소개하고, 사물인터넷을 위한 서비스 지향 아키텍처를 기능에 따라 4개의 계층으로 구분하여 각각의 기능을 비교하고 검토함으로써 사물인터넷 기술의 활용도를 높이고자 한다.