• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.11
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• pp.1909-1928
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• 2011

Node cooperation during packet forwarding operations is critically important for fair resource utilization in Community Wireless Mesh Networks (CoWMNs). In a CoWMN, node cooperation is achieved by using fairness protocols specifically designed to detect and isolate malicious nodes, discourage unfair behavior, and encourage node participation in forwarding packets. In general, these protocols can be split into two groups: Incentive-based ones, which are managed centrally, and use credit allocation schemes. In contrast, reputation-based protocols that are decentralized, and rely on information exchange among neighboring nodes. Centrally managed protocols inevitably suffer from scalability problems. The decentralized, reputation-based protocols lacks in detection capability, suffer from false detections and error propagation compared to the centralized, incentive-based protocols. In this study, we present a new fairness protocol management scheme, called Hybrid FPMS that captures the superior detection capability of incentive-based fairness protocols without the scalability problems inherently expected from a centralized management scheme as a network's size and density grows. Simulation results show that Hybrid FPMS is more efficient than the current centralized approach and significantly reduces the network delays and overhead.

• Transactions of the Korean Society of Automotive Engineers
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• v.18 no.6
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• pp.138-144
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• 2010

If the vibration is occurred in a large-sized bus roof, it makes people annoying and complaining the quality of a large-sized bus. So in design stage, it must be considered. To assess vibration at the roof which is equipped with air conditioner in design stage, finite element model is constructed. Computer simulation analysis and experimental method are performed. The dynamic characteristics of the large-sized bus are found by using eigenvalue method. It is related with dynamic behavior. The running conditions of a large-sized bus are velocity and road condition which followed experimental conditions. And the frequency response of a large-sized bus is well correlated with analysis result. Modal participation method is used for finding major modes at each peak. Using this method, we found that front and rear suspension system, engine mounting system and roof structure are the major reasons of the roof vibration. To reduce vibration level of roof in a large-sized bus, spring stiffness of front and rear suspension system, spring stiffness of engine mounting system and roof structure are properly combined. From this study, the vibration characteristics of the roof structure of a large-sized bus can be to a satisfactory level.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.6
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• pp.2829-2832
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• 2012

Background: This study aimed to research the awareness of screening colonoscopy (SC) among patients with colorectal cancer (CRC) and their relatives. Methodology: A questionnaire form including information and behavior about colonoscopic screening for CRCs of patients and their first-degree relatives (FDRs) was prepared. Results: A total of 406 CRC patients were enrolled into the study, with 1534 FDRs (siblings n: 1381 and parents n: 153). Positive family history for CRC was found in 12% of the study population. Previous SC was performed in 11% of patients with CRC. Mean age of the patients whose FDRs underwent SC was lower than the patients whose FDRs did not (52 vs 57 years; p<0,001). The frequency of SC in FDRs was 64% in patients diagnosed CRC under 35 years of age. Persons having a positive family history of CRC had SC more often (51 vs 22%, p<0,001). FDRs of patients having a higher educational level and income had SC more frequently. Conclusions: When screening for CRC is planned, elderly subjects, those with family history for CRC, and those with low educational and lower income should be given esspecial attention in order that they be convinced to undergo screening for CRC.

• Journal of Information Technology Services
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• v.15 no.2
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• pp.1-19
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• 2016

With various success stories of crowdfunding, government's establishment of crowdfunding act, and expected rapid growth of crowdfunding market, the potential ripple effect of crowdfunding on our society is anticipated to be enormous. This study investigates the influential factors and their impacts on the likelihood of project success in donation-based crowdfunding through the DonorsChoose case. The authors analyze the characteristics of project creator, characteristics of project, and behaviors of project participants in relation to the success or failure of the corresponding project. Consequently, the authors found that participants of donation-based crowdfunding exhibit altruistic behaviors and obtained the following specific results: First, donation participation and social capital of the project creator, and marginal help utility of receivers positively affect the success of project. Second, experience of past project creation of the project creator negatively affects the success of project. Third, past donations of the project creator to others' projects, when not appropriately signaled like on the DonorsChoose platform, may not exert a positive influence on the success of project and the reciprocity principle may not work.

• Hwankyungkyoyuk
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• v.9 no.1
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• pp.90-99
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• 1996

This study focused on the investigation of objects and contents of environment-related chapters which were contained in the biology textbooks of middle school in the 5th curriculum, and in the 6th curriculum. As a result of objects analysis, cognitive domain such as the knowledge and information categories were allocated more than affective domain as skill, value and attitude, and behavior and participation. Compared with the 5th curriculum, the average-pages of environment-related chapters in the 6th curriculum were decreased. Environment-related chapters in the 6th curriculum also dealt negligibly with the real environmental problems in our country. Therefore the importance of the environment-related chapters of biology textbooks in the 6th curriculum was relatively deceased compared with that in the 5th curriculum. In considering the actual low optional rate of environment subject in middle school, it was thought that the reinforcing effect of environmental education can be hardly expected. Rather, the status of environment subject will grow weaker and weaker. Thus, in order to avoid the deterioration effect of its status and solve its problems, it is necessary to up-grade environment subject as obligatory course or needs strong reinforcement of environmental education.

• Journal of Information Technology Applications and Management
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• v.15 no.3
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• pp.169-194
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• 2008

Recently, the concept of web site stickiness receives attention as a measure of strategy to influence user's visit and behavior on web sites. Web site stickiness means site visit frequency and stay duration. This study investigates the moderating effect of espoused national cultural values on Internet community stickiness with the assumption that dimensional values of national culture can be internalized as individual’s espoused values. Espoused values (i.e., espoused national cultural values) are defined as the degree to which an individual embraces the values of his or her national culture. Our findings can be summarized as follows. First, femininity and power distance moderate the influence of user participation on Internet community stickiness. Second, uncertainty avoidance and power distance moderates the effect of social influence on Internet community stickiness. However, femininity and collectivism do not moderate the effect of social influence on Internet community stickiness. Third, uncertainty avoidance, femininity, and collectivism moderate the influence of network effect on Internet community stickiness. Fourth, masculinity does not moderate the influence of usefulness on Internet community stickiness.

• The Journal of Information Systems
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• v.6 no.2
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• pp.51-83
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• 1997

정보시스템 아웃소싱(outsourcing)의 적용 범위와 그 규모가 증대함에 따라, 아웃 소시은 정보시스템의 관리에서 근본적인 이슈로 등장하게 되었다. 정보시스템 아웃소시의 중요성이 인식되었으나, 그에 대한 실증적 연구는 매우 미흡한 실정이다. 본 연구의 주요 목적은 정보시스템 아웃소싱에 있어 고객회사(client firm)와 서비스 제공업자(vendor)간의 관계의 성공 및 실패에 영향을 미치는 요인을 조사하는 것이다. 본 연구의 연구 모델은 관 계적 거래이론(relational exchange theory), 커뮤티케이션 행동(communication behavior), 거래비용분석(transaction cost analysis) 등의 조직간 관계(interorganizational relationship) 이론에 기반을 두고 작성되었다. 미국의 207개 회사의 정보시스템 아웃소싱 설문조사에 의 하여 다음과 같은 연구결과가 도출되었다. (1) 서비스 제공업자의 능력(vendor capability), 관계결속성(solidarity), 터링(monitoring of the vendor), 참여도(participation) 등이 아웃소 싱 관계의 성공과 양의 상관관계를 가지고 있으며, (2) 역할참여도(role integrity), 자산특이 성(asset specificity) 등은 아웃소싱 관계의 성공과 음의 관계를 가지고 있는 것으로 나타났 다. 이 결과에 의하면, 비관계적 거래(discrete exchange) 보다는, 관계적거래(relational exchange)에 기반을 두어 아웃소싱 관계를 운영하는 것이 아웃소싱의 성공적인 구현을 위 하여 필수적으로 보여진다. 이 연구 결과를 기초로 하여 아웃소싱 대상 업무의 선택, 서비 스 제공업자의 선택, 그리고 아웃소싱 관계의 지속적인 관리를 위한 지침을 제시하였다.

• The Journal of Korean Association of Computer Education
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• v.16 no.1
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• pp.1-9
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• 2013

Computational thinking has been recently highlighted as an essential ability of the 21st Century so that many educational efforts have focused on broadening participation in computing and promoting computational thinking in K-12 settings. This paper describes the impact of creative learning activities with the Scratch on middle school students' computational thinking and creative potential. The learning activities were designed and implemented in 12 sessions with 34 middle school students. The pre and post creative potential assessment results show that students' creative personality and ideational behavior were significantly enhanced. Also, project portfolio analysis shows that students came to understand several computational concepts that are useful in a wide range of programming contexts: sequences, loops, conditionals, events, and operators.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.13 no.1
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• pp.107-118
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• 2006

Purpose: This study was done to identify the predictors of smoking in middle school boys'. A comprehensive analysis of individual, family and social environment-related factors was done. Method: The participants in this descriptive survey on causal relations were 318 students enrolled in middle schools who were selected by convenience sampling. The data collected from June to July 2003 were put in to logistic regression analysis to build a prediction model. Results: 1) Individual-related factors for smoking in middle school boys' were participation in drinking and deliilquent behavior 2) Family-related factors were ill-treatment physically of the types of ill-treatment and mother being unemployed. 3) Social environment/peer-related factors were friends' attitudes towards delinquency. Conclusion and Recommendations: The experience of smoking among Korean middle school boys was associated not only with individual factors, but also with family and social environmental factors. The findings of this study suggest that broad intervention program should be provided to prevent adolescent smoking. It is also recommended that a program be developed that can help control the variables identified in this study along with a follow up study to verify the model.

• Journal of Korean Home Economics Education Association
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• v.2 no.1
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• pp.123-142
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• 1990

The aim of this study is to apply lesson design of high school home economics to model which consists of six steps of instructional procedure among various models for instructional design, Through thesis, central content of each step was written as follows; 1) At the step of establishment of terminal instructional objectives, educational objectives, terminal instructional objectives was analyzed and specific instructional objectives was extracted. 3) At the step of diagnosis of entering behavior, ability of prior learning and ability of preliminary learning were evaluated, which was used as establishing instructional strategy and doing individual guidance. 4)At the step of determining instructional strategy, instructional strategy should be extracted by considering instructional event which is adequate to content of instruction. Instructional strategy consists of five main factor, factors, those are, activity of introduction of instruction, presentation of content of instruction and information, participation of learner and learning activity, identification of learning result, and subsequent treatment after evaluation. 5)Specific activity at the step of selection and development of instructional media consists of reidentification of instructional objectives determination of learning type, drawing up instructional media analysis sheet, synthesis of selected media, and explanatory note of selected media. In order to increase efficiency of instruction at the step of determining instructional strategy, this step should be considered simultaneously. 6)The step of try-out and evaluation of instructional design should be efficient when designed instruction was inputted at class after evaluation of each step of instructional design.