• The Korean Journal of Applied Statistics
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• v.7 no.2
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• pp.1-7
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• 1994

Using a Monte-Carlo simulation technique we evaluate the empiricla distribution of a pseudo-chi-square statistic based on symmetrically Winsorized sum of squares when the population is normally distributed, and search for a chi-square distribution with appropriate degrees of freedom which can be referred to an approximate distribution for Winsorized chi-square.

• The Korean Journal of Applied Statistics
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• v.10 no.2
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• pp.339-352
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• 1997

Chi-square test based on large sample theory is inappropriate for testing the row homogeneity in two-way contingency table with several sparse cells. For that case, exact testing methods has been developed in the literature and implemented in StatXact(1991). However, considerable computing time is inevitable for moderate size tables. So, Monte Carlo approximation is recommended frequently. In this study, we propose a simple algorithm for generating two-way random tables with fixed row and column margins for small sample chi-square test. Also, we develop “Turkey-type” method for multiple between-row comparisons.

• Asia Marketing Journal
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• v.9 no.2
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• pp.23-47
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• 2007

A new chi-square test is proposed to assess significance of attributes for nonparametric conjoint models. The key idea is to form subsets of rankings and test the dependence between the attribute levels and the sets of rankings. The null hypothesis states that the rankings for profiles with the focal attribute are distributed randomly among the sets of rankings. The approach is simple, easy to use, and can be applied at the individual level as well as at the aggregate level. It can be used for the trade-off approach as well as for the full profile approach.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.8
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• pp.781-789
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• 2010

In the GPS/INS integrated system fault detection, algorithm based on a chi-square distribution is commonly used. In this paper, it has been proposed simplified GPS/INS fault detection algorithm that is combined conventional RAIM (Receiver Autonomous Integrity Monitor) and algorithm based on chi-square distribution for UAV using row-grade processor. It use a fault model to verify the proposed algorithm and produced the result.

• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.906-909
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• 2010

본 연구는 대학생의 성격유형에 따른 섭식태도 및 비만스트레스를 알아보기 위해 2009년 11월 2일~11월 19일까지 대전지역 일개대학 대학생을 대상으로 설문지를 배포하여 총 285부의 유효부수를 조사에 활용하였다. 각 문항에 대한 빈도분석과 백분율, 교차분석을 이용하였고, 집단간 차이에 대한 유의성 검증을 위해 카이제곱과 로지스틱 분석을 실시하였다. 본 연구의 주요결과는 대학생의 성격유형(A형,B형)에 따른 섭식태도는 카이제곱 분석을 한 결과 조사대상자의 일반적 특성 통계적으로 유의하지 않아서, 성격유형에 따른 섭식태도의 차이를 나타내지 않았다. 대학생의 성격유형(A형,B형)에 따른 비만 관련 스트레스는 카이제곱 분석을 한 결과 조대상자의 일반적 특성 통계적으로 유의하지 않아서, 성격유형에 따른 비만스트레스는 차이를 나타내지 않았으며, 섭식태도와 비만스트레스에 영향을 미치는 요인을 로지스틱 분석한 결과 각각에 성격유형에 따른 차이를 나타내지 않았다. 본 논문은 대학생의 성격유형에 따른 섭식태도, 비만스트레스에 차이가 있을 것으로 예상하였으나, 연구결과 별다른 차이를 보이지 않아 섭식태도, 비만스트레스는 성격유형과 무관한 것으로 나타났다. 이상의 결과에서 볼 때 대학생의 성격유형과 섭식태도, 비만스트레스는 무관한 것으로 판단되어 진다. 선천적인 성격유형과 비만과의 관계에 대한 다각적인 선행연구가 전무한 실정이므로 앞으로 보다 많은 연구를 통해 비만관련 영양 교육 및 보건교육, 나아가 비만 관련 치료 시 성격유형에 대한 고려가 이루어지기를 기대한다.

• KIPS Transactions on Software and Data Engineering
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• v.1 no.1
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• pp.69-74
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• 2012

Many internet users attempt to focus on the issues which have posted on social network services in a very short time. When some social big issue or event occurred, it will affect the number of comments and retweet on that day in twitter. In this paper, we propose the method of extracting core events based on timeline analysis, sentiment feature and retweet information in twitter data. To validate our method, we have compared the methods using only the frequency of words, word frequency with sentiment analysis, using only chi-square method and using sentiment analysis with chi-square method. For justification of the proposed approach, we have evaluated accuracy of correct answers in top 10 results. The proposed method achieved 94.9% performance. The experimental results show that the proposed method is effective for extracting core events in twitter corpus.

• Journal of Korea Multimedia Society
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• v.15 no.9
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• pp.1149-1155
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• 2012

In this paper, we propose cause diagnosis method of semiconductor defects from semiconductor industrial images. Our method constructs feature database (DB) of defect images. Then, defect and input images are subdivided by uniform block. And the block similarity is measured using histogram kai-square distance after color histogram calculation. Then, searched blocks in each image are merged into connected objects using clustering. Finally, the most similar defect image from feature DB is searched with the defect cause by measuring cluster similarity based on features of each cluster. Our method was validated by calculating the search accuracy of n output images having high similarity. With n = 1, 2, 3, the search accuracy was measured to be 100% regardless of defect categories. Our method could be used for the industrial applications.

• Industry Promotion Research
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• v.5 no.1
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• pp.13-20
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• 2020

This study is about consumer preference of plastic toilets that can provide automatic supply of recycled water. First, the preference for plastic toilet seat design by gender and age group was preferred for gender type C and G for the sex. As the result of the chi-square test, the significance probability is .044 and the significance is P <.0 5. I could confirm that. Age, teens, 40 s, and 50 s or older prefer type C, 20 s and 30 s, but B type is not statistically significant. Second, the differences among the groups of preference for appearance design criteria according to general characteristics were all stable (stable appearance) in gender, age, region, education, and salary, but the chi-square test showed that they were not statistically significant. There was no difference between them. This study has implications for improving competitiveness and productivity by reducing the main production cost by commercializing toilets made of plastic materials.

• Journal of East-West Nursing Research
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• v.14 no.1
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• pp.78-86
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• 2008

본 연구는 여대생의 건강증진행위를 설명하기 위하여, 문헌고찰을 통해 가설적 모형을 도출하고, 여대생을 대상으로 건강증진행위를 횡단적으로 조사하여 모형의 적합성과 모형에서 제시된 가설을 검증하는 서술적 상관관계 연구이다. 연구에 사용된 변수는 건강증진행위와 관련된 선행 문헌의 고찰을 근거로 선정되었으며, 총 280명의 자료가 최종 분석에 이용되었다. 설문지는 Pender의 건강증진모형을 기초로 하여 개발하였으며, 조정요인 5문항, 건강상태 지각 3문항, 건강 통제위 4문항, 자아 존중감 5문항, 건강증진 행위 24문항의 총 41문항으로 구성하여 사용하였다. 개발된 항목에 대하여 간호대학생들을 대상으로 사전 조사를 실시하여 최종적인 설문지를 완성하였다. 본 연구모형에 대한 구성개념의 파악을 위해서 탐색적 요인분석을 실시하였고, 측정항목에 대한 요인별 단일 차원성 확인 및 통계적 검정을 위해 확인적 요인분석을 실시하였다. 연구의 가설검증을 위해 공변량 구조분석을 실시하였다. 모형의 적합도는 카이제곱은 244.04(자유도=121, p<0.001), GFI=0.91, CFI=0.97, NNFI=0.96, RMSR= 0.022으로 나타났다. 분석결과 여대생의 자아존중감과 내적통제위는 건강상태지각 및 건강증진행위에 유의한 영향을 미치는 요인으로 확인되었으며, 여대생의 건강상태지각은 건강증진행위에 유의한 영향을 미치는 것으로 나타났다.

• The Journal of the Korea Contents Association
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• v.21 no.1
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• pp.446-455
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• 2021

The purpose of this study was to examine kindergarten teachers' perceptions on early childhood. Questionnaires were distributed to kindergarten teachers throughout Gyeonggi-do areas in Korea. A total of 794 questionnaires from kindergarten teachers were analyzed. The data were analyzed by frequency analysis and percentage, chi-squre verification using SPSS Win 21.0 Program. As a result of the study, it was found that most of the teachers are aware of the high interest and importance of children's value education, and most of them responded that they conduct value education. The recognition that the implementation method should be done through kindergarten life guidance was highest, followed by interaction during play. In the current status of implementation, teachers were mainly practicing values education through life guidance.