• Title, Summary, Keyword: 이질성검증

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Methods to Design IoT Applications with Heterogeneity (IoT 애플리케이션의 이질성을 고려한 설계 기법)

  • Lee, Johan;Park, Chun Woo;Kim, Moon Kwon;Choi, Kwang Sun;Kim, Soo Dong
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.353-356
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    • 2013
  • IoT(Internet-of-Things)는 사람과 물리적 사물이 언제, 어디서나 소통할 수 있는 컴퓨팅 패러다임으로, IoT 디바이스의 역량이 높아짐에 따라, IoT 디바이스를 이용한 IoT 애플리케이션 개발에 관심이 높아지고 있다. 하지만 IoT 디바이스가 가지는 통신 프로토콜 이질성, API 이질성, 데이터 형식 이질성, 프로그래밍 언어 이질성이 IoT 애플리케이션 개발의 어려움으로 작용하고 있다. 본 논문은 이러한 이질성들을 분석하고 각 이질성을 해결하기 위한 설계 기법을 제안하고 실제로 이를 적용하여 IoT 애플리케이션을 설계 및 구현 함으로써 도출한 이질성 해결의 중요성과 제안한 설계 기법의 실효성을 검증한다.

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The Effects of Household Characteristics and Poverty Duration on Poverty Exit Rate -Examining the Effects of Duration Dependency and Sample Heterogeneity - (가구특성과 빈곤지속기간이 빈곤탈피율에 미치는 영향 -지속기간의존성과 표본이질성에 대한 검증을 포함하여-)

  • Kim, Hwanjoon
    • Korean Journal of Social Welfare Studies
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    • v.44 no.3
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    • pp.301-322
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    • 2013
  • By analyzing wave 1~11 (1998~2008) of Korean Labor and Income Panel Study(KLIPS) database, this study examines the effects of household characteristics and poverty duration on poverty exit. A special concern is to decide whether the decrease of poverty exit rates comes from true duration dependency or from the sample heterogeneity as poverty duration progresses. I also analyzed how the effects of independent variables are changed when unobserved heterogeneity is controlled. The results show that duration dependency disappears after controlling observed household characteristics and unobserved individual heterogeneity. This finding confirms that the apparent relationship between poverty exit rate and poverty duration is in fact a spurious association due to the sample heterogeneity rather than true duration dependency. In addition, the effects of household characteristics on poverty exit rate become more stronger when unobserved heterogeneity is controlled. Socioeconomic factors affecting poverty exit rates are such as householders' age, education, household composition, number of family members, labor force participation, and work status.

A Study of the Moderating Role of Heterogeneity in the Process of Customer Satisfaction Formation on Public Services (공공서비스의 이질성 정도에 따른 고객마족혀엉과정 차이에 관한 연구)

  • Kim, Young-Ku;Kim, Kyoung-Hwan;Ha, Young-Chul
    • Journal of Global Academy of Marketing Science
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    • v.8
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    • pp.207-232
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    • 2001
  • Many customer satisfaction studies have accepted the confimation/disconfirmation paradigm, but the findings as the antecedents of consumer satisfaction are mixed. So rather than asking whether or not there is a direct effect of a certain variable on satisfaction, it is necessary asking when does a certain variable have a direct effect on satisfaction. According to this result, we assume that the situation has a direct effect on satisfaction. So this study has investigated the moderating role of perceived heterogeneity as a unit of situation, in the process of customer satisfaction formation, especially on public service. We have found such thing as follows. 1) situation has an effect on customer satisfaction. 2) perceived heterogeneity of the customers, as a situation variable, lets the process of their satisfaction formation differ. 3) through these studies, the confirmation/disconfirmation paradigm are able to extend on public services.

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Meta-analysis of the effects of TPM activity factors on Corporate performance (TPM 활동요인이 기업성과에 미치는 영향에 대한 메타분석)

  • Yeon, Keyong-Hwa
    • Journal of Digital Convergence
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    • v.16 no.2
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    • pp.151-156
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    • 2018
  • The purpose of this study is to conduct a meta-analysis of 18 papers that can be verified among the papers on the subject of TPM. Five hypotheses were set for the analysis and meta - analysis was carried out with CMA as presented in each research paper. As a result of analysis, I-square value is more than 75% in four hypotheses. Therefore, the null hypothesis that the size of the population effect is the same for all studies was rejected. The reason for the heterogeneity is that the research characteristics such as the distribution of the respondents, the study conditions, the study period, and the study area are different. In this case, a summary statistic of the individual studies that can be classified according to the characteristics of the research is needed to analyze the effect size difference. However, individual studies do not provide a summary statistic that can classify the effect differences, so it is not possible to analyze the causes of heterogeneity.

A Comparative Study on Localization of Service Strategies (서비스 전략 현지화 국제비교 연구 -한국과 싱가포르에 진출한 외국인 투자 서비스 기업을 중심으로-)

  • Nho, Jeon-Pyo
    • Korean Business Review
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    • v.13
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    • pp.195-206
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    • 2000
  • The purpose of this study is to compare the service strategies of foreign service firms between Singapore and Korea, relative to the country where their headquarters are located. Specifically this study investigates (1) how the service strategies are adaptively executed based on local circumstances, (2) to what extent the cultural and legal environments of the two countries are different, and (3) how the differences in the environments affect the adaptation of the service strategies. The findings of this study indicate that there exists the perceptual differences in the legal environments between Singapore and Korea, but no significant differences are found in the cultural environments. The differences in the legal environments, however, do not affect the adaptation of the service strategies. Interestingly enough, the foreign service firms in Singapore perceive less sensitively the need for adapting service strategies. But the foreign service firms in Korea perceive more sensitively the need for the adaptation.

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Heterogeneity of Workers and the Entry into Self-employment - Focusing on the Entry of Wage Workers into Self-Employment - (근로자의 이질성과 자영업 선택에 관한 실증분석 - 임금근로에서 자영업으로의 진입을 중심으로 -)

  • Kim, Woo-Yung
    • Journal of Labour Economics
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    • v.36 no.2
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    • pp.1-36
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    • 2013
  • This study examines how the unobserved heterogeneity of workers, measured by residuals of the wage equation, affects the entry into self-employment using KLIPS 1998-2008. Following Joona and Wadensjo(2013), we treat the residuals as unobserved ability and find that both workers with higher and lower ability are more likely to become self-employed. However, this U-Shape relationship no longer holds when the sample is divided into males and females. The study also finds that the relationship between ability and entry into self-employment has changed over time, and that ability is positively associated with the performance of self-employed.

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Effects of Cognition Improvement Programs on Normal Elderly in Korea: A Systematic Review and Meta-Analysis (국내 노인의 인지기능 향상 프로그램의 효과연구: 체계적 문헌고찰과 메타분석)

  • Kim, Kyoungyun;Lee, Eunjoo
    • 한국노년학
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    • v.37 no.2
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    • pp.431-444
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    • 2017
  • This study identified effect size of cognition improvement programs developed for normal elderly in Korea. By searching four databases, 9,624 studies published from 2000 to 2016 were identified. Finally, 14 studies which satisfied the inclusion criteria were selected for meta-analysis. Quality assessment of included studies was conducted using controlled trial checklist of Scottish Intercollegiate Guidelines Network. R version 3.3.2 (2016-10-31) with "meta" and "metafor" package was used to calculate effect sizes, identify the reasons of heterogeneity, and check publication bias. Total effect size of cognition improvement program was middle (SMD=0.759, p<.001, $I^2=34%$). For heterogeneity, moderator analysis was executed and combined program with exercise had the largest effect size (SMD=1.231, p<.001, $I^2=40.8%$). Publication bias was exist by funnel plot and Egger 's regression test, but trim and fill analysis showed that there was no serious error to reverse study results. Therefore, Combined program with exercise for the normal elderly was expected to improve the cognitive function of the normal elderly.

The Effect of Job Stress on Burnout and Organizational Commitment (직무스트레스가 소진 및 조직몰입에 미치는 영향)

  • Park, Jong-Chan;Shin, Hye-Sook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.11
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    • pp.5114-5123
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    • 2012
  • This paper tried to identify the impacts of job stress on burnout and organizational commitment in the casino industry. Prepared questionnaires were distributed to 300 sample employees working in domestic casino, then used for data analysis 283. The results of this study are as follows: Firstly, dissimilarity have a positive effect on emotional exhaustion. Secondly, role conflict and dissimilarity have a positive effect on lack of accomplishment. And role ambiguity have a negative effect on lack of accomplishment. Also role conflict and dissimilarity have a positive effect on depersonalization. And role ambiguity have a negative effect on depersonalization. Thirdly, role ambiguity have a positive effect on affective commitment. But, job stress have not effect on continuance commitment. This study will be able to contribute raising competitiveness of casino corporate and efficiency of human resource management.

Channel Heterogeneity Aware Channel Assignment for IEEE 802.11 Multi-Radio Multi-Rate Wireless Networks (IEEE 802.11 다중 라디오 다중 전송률 무선 네트워크를 위한 채널 이질성 인지 채널 할당)

  • Kim, Sok-Hyong;Kim, Dong-Wook;Suh, Young-Joo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.11A
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    • pp.870-877
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    • 2011
  • IEEE 802.11 devices are widely used, and terminals can be equipped with multiple IEEE 802.11 interfaces as low-cost IEEE 802.11 devices are deployed. The off-the-shelf IEEE 802.11 devices provide multiple channels and multiple data rates. In practical multi-channel networks, since there is channel heterogeneity which indicates that channels have different signal characteristics for the same node, channels should be efficiently assigned to improve network capacity. In addition, in multi-rate networks, low-rate links severely degrade the performance of high-rate links on the same channel, which is known as performance anomaly. Therefore, in this paper, we propose a heterogeneity aware channel assignment (HACA) algorithm that improves network performance by reflecting channel heterogeneity and performance anomaly. Through NS-2 simulations, we validate that the HACA algorithm shows improved performance compared with existing channel assignment algorithms that do not reflect channel heterogeneity.

An analysis of effect for grouping methods corresponding to ecological niche overlap of 7th graders' photosynthesis concepts (7학년 광합성 개념의 지위 중복 변화에 따른 소집단 구성의 효과 분석)

  • Jang, Hye-ji;Kim, Youngshin
    • Journal of Science Education
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    • v.41 no.2
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    • pp.195-212
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    • 2017
  • Small group learning is an educational approach to allow students to solve the problems and to achieve a common goal. Especially, small group learning in science education is one of the most important educational approaches and effective to ensure understanding of a topic. Small group learning consisting of three students in science education maximize student understanding and learning efficiency. However, It is reported that the effects of small group learning on achievement show different results, corresponding to different grouping methods(homogeneous/heterogeneous). This study investigated the effects of grouping method on difference of ecological niche of photosynthesis concepts. To achieve this, 1107 7th students were composed of homogeneous and heterogeneous groups classified into top, middle, and bottom levels. The photosynthesis units were divided into four categories: the photosynthesizing place, the substances of photosynthesis, required materials for the photosynthesizing, and environmental factors affecting photosynthesis. A questionnaire was composed by selecting concepts having a frequency of 4% or more based on prior studies on the change of the ecological status of photosynthesis. The questionnaire was scored in terms of relativity and understanding on each of the proposed concepts in the four categories. The result of this study is as set forth below. 1) There was an enhancement of learning the concept of science in small group classes consisting of 3 students. 2) To enhance the average upon composing of a group, it is proposed that the group should be formed homogeneously, and to reduce the deviation between the members, it is proposed that the group should be formed heterogeneously. Through this study, it is expected that specific studies verifying the difference or effect on the duplicity of results are conducted based on the composition of groups.