• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권10호
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• pp.4766-4786
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• 2016

Looking for missing companions who are out of touch in public places might suffer a long and painful process. With the help of mobile crowdsourcing, the missing person's location may be reported in a short time. In this paper, we propose MissingFound, an assistant system that applies mobile crowdsourcing for finding missing companions. Discovering valuable users who have chances to see the missing person is the most important task of MissingFound but also a big challenge with the requirements of saving battery and protecting users' location privacy. A customized metric is designed to measure the probability of seeing, according to users' movement traces represented by WiFi RSSI fingerprints. Since WiFi RSSI fingerprints provide no knowledge of users' physical locations, the computation of probability is too complex for practical use. By parallelizing the original sequential algorithms under MapReduce framework, the selecting process can be accomplished within a few minutes for 10 thousand users with records of several days. Experimental evaluation with 23 volunteers shows that MissingFound can select out the potential witnesses in reality and achieves a high accuracy (76.75% on average). We believe that MissingFound can help not only find missing companions, but other public services (e.g., controlling communicable diseases).

• 대한간호학회지
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• 제38권4호
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• pp.550-560
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• 2008

Purpose: The purpose of the study was to investigate the psychological factors that affect marital satisfaction or divorce likelihood in clinical couples. Methods: Clinical couples (n=57) who visited "M" couple clinic participated in the study. Data was collected from September 2005 to June 2006 using a Marital Satisfaction Scale, a Marital Status Inventory, Beck Depression Inventory, Maudsley Obsessional-Compulsive Inventory, and Minnesota Multiphasic Personality Inventory. Results: The couples showed high scores on depression, obsessive-compulsion, personality factors and divorce probability and a low score on marital satisfaction. The wife's obsessive-compulsion was a predictor of her marital satisfaction, and the wife's social introversion and depression, and husband's obsessive-compulsion were predictors of the wife's prospect of divorce. The husband's hypomania and depression were predictors of his marital satisfaction, and there were no predictors of the husband's prospect of divorce. Conclusion: Obsessive-compulsion is a significant factor in a couple's relationship, although previous studies have not been interested in obsessive-compulsion. Divorce likelihood should be evaluated for clinical couples as well as marital satisfaction, because it is more important for divorce prevention. Each spouse who has a psycho logical problem such as depression, obsessive-compulsion, and deviated personality needs individual therapy as well as couple therapy.

• 한국과학교육학회지
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• 제7권2호
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• pp.1-14
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• 1987

To examine the effect of students' Cognitive level upon their achievement on Science. the students' cognitive levels were tested by using GALT(Group Assessment of Logical Thinking) and examined the Correlation between the cognitive level and achievement According to the results, most students were still in the conerete level. Only 60% of 9th grade students could handle the logic of displacement volume. In case of proportional logic and logic of probability, only 40% of 9th graders could handle them. Only 10% of the students could understand Correlational logic. Cognitive level and students achievement were estimated to be in a very closely related. Students who were in a high cognitive level showed better achievement scores on knowledge, comprehensive, inquiry, and application items than those who were in low cognitive level. Therefore, this study suggests that the content of the current middle school science should be revised in away to match the students' cognitive level.

• Journal of Communications and Networks
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• 제14권5호
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• pp.566-577
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• 2012

In randomly deployed networks, such as sensor networks, an important problem for each node is to discover its neighbor nodes so that the connectivity amongst nodes can be established. In this paper, we consider this problem by incorporating the physical layer parameters in contrast to the most of the previous work which assumed a collision channel. Specifically, the pilot signals that nodes transmit are successfully decoded if the strength of the received signal relative to the interference is sufficiently high. Thus, each node must extract signal parameter information from the superposition of an unknown number of received signals. This problem falls naturally in the purview of random set theory (RST) which generalizes standard probability theory by assigning sets, rather than values, to random outcomes. The contributions in the paper are twofold: First, we introduce the realistic effect of physical layer considerations in the evaluation of the performance of logical discovery algorithms; such an introduction is necessary for the accurate assessment of how an algorithm performs. Secondly, given the double uncertainty of the environment (that is, the lack of knowledge of the number of neighbors along with the lack of knowledge of the individual signal parameters), we adopt the viewpoint of RST and demonstrate its advantage relative to classical matched filter detection method.

• 대한한의학원전학회지
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• 제32권3호
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• pp.31-45
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• 2019

Objectives : This paper aims to suggest alternative interpretations to previous ones of 'Daedong-eo-Hyeobui(大同於協義)' and 'Gakrip-eo-Cheonri(各立於擅利)' in the chapter 'Theories on Nature and Conduct(性命論)' in Donguisusebowon(東醫壽世保元) which have been found to be inadequate. Methods : Previous interpretations were thoroughly examined, then evaluated based on the narrative form and logical probability of the Donguisusebowon(東醫壽世保元). Afterwards, correct interpretations of the contents were suggested based on the context of the chapter 'Theories on Nature and Conduct(性命論).' Results & Conclusions : Of 'Daedong-eo-Hyeobui(大同於協義)', Daedong(大同) should be interpreted as 'to gather largely' instead of 'all the same.' Hyeobui(協義) should be interpreted as 'to submit willingly' and not 'to cooperate to Ui(義).' In the case of 'Gakrip-eo-Cheonri(各立於 擅利)', Gakrip(各立) means for people of same minds to rise against evil individually while Cheonri(擅利) refers to the evil of coveting for gains individually. There are other cases where existing interpretations have been erroneous other than the suggested examples, which prompts thorough re-evaluation of the text.

• 유통과학연구
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• 제20권2호
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• pp.91-100
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• 2022

Purpose: The sports industry is a major form of leisure and entertainment, but the industry was tremendously affected by the Covid-19 pandemic. This study gives solutions for sports leisure retail stores to the effects of the Covid-19 crisis on consumers' sports products purchasing habits and then gives a logical conclusion regarding the findings of the topic. Research design, data and methodology: Scant research is available to feedback for owners and managers of sports leisure retail stores which elements could be considered to recover their business prior to the pandemic. For achieving this, this study investigated total 284 responses in the retail stores and conducted the ANOVA analysis to compare the level of intensity on the impact Covid 19 pandemic. Results: Our findings suggests that there was a statistically recognizable difference at the significance level of probability between the mean value of the impact index of Covid 19 pandemic and key recovery strategies, indicating the high degree of Covid 19 impact can be reducing by four solutions. Conclusions: Finally, this study concludes the specific entertainment elements that influence the purchasing behavior of consumers will ensure that the Sports industry deals with its internal problems first without necessarily looking at the outside factors such as the pandemic.

• 자원환경지질
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• 제40권3호
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• pp.295-306
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• 2007

본 연구에서는 확률기법인 빈도비 모델 (frequency ratio model) 및 지리정보시스템 (Geographic Information System: GIS)의 공간분석기법을 이용하여 강원도 삼척지역 폐탄광 주변의 지반침하 발생 취약지역을 예측하였다. 지반침하에 영향을 주는 요인들을 추출하기 위해 지형도, 지질도, 갱내도, 토지특성도, 시추공 자료, 기 관측된 침하지 자료 등으로부터 공간자료를 구축하였다. GIS 공간분석과 확률기법을 이용하여 지반침하의 주 요인이 되는 8개의 인자를 추출하였고 관측된 침하지역과 8개 인자와의 연관성을 알아보기 위하여 각각의 결정계수($R^2$)를 계산하였다. 빈도비 모델을 적용하여 각인자의 등급별 가중치를 결정한 후, 이를 중첩 분석하여 지반침하 위험 예측도를 작성하였다. 지반침하 위험 예측도를 기존 침하지 위치와 비교 검증한 결과 96.05%의 높은 예측정확도를 나타냈다. 이를 통해 폐탄광 지역에서 GIS와 빈도비 모델을 이용하여 지반침하 위험지역을 정량적으로 예측하는 것이 가능하다고 판단된다.

• 한국초등과학교육학회지:초등과학교육
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• 제19권1호
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• pp.131-143
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• 2000

The unit of a buoyant force included in the 7th national science curriculum for 6th grade students. On the contrary, it seldom that students' conception about buoyant phenomena is studied, even though there has been many studies of students' conceptions of basic science contents. The purpose of this study was to survey the elementary school students' conceptions of a buoyant force, to analyze their cognitive levels, and to explore the relationships between them. Sixth grade students (total numbers is 192) were selected .from 5 .lasses in two elementary schools in a local city of Kyungsangdo. They were asked to respond two kinds of test, which are the Logical Thinking Ability (GALT) to investigate students' cognitive levels and the Buoyant Force Questionnaire (BFQ). We developed BFQ test, based on the 7th national science curriculum for 6th grade and the previous researches of a buoyant force. We, qualitatively, analysed students' frequency of responses about a buoyant force and their types of explanation, and, quantitatively, analysed the relationships between cognitive levels and conceptions of a buoyant force with SPSS/ PC 7.0 programmes. The results of cognitive level showed that half of 6th grade students were in the concrete operational stage, 43.2% in the transitional stage, 6.8% in the formal stage. However, their sub-logical thinking abilities in a combinational, conservational, controlling variables, proportional, probability and correlational logic were very fluctuated from 91% to 8%. The results that only 4.8% of elementary students had correct conceptions of a buoyant force suggest that 6th grade students had great difficulties in understanding of that concept. Their difficulties would originated from the frequent common-sense explanations of a buoyant phenomena in terms of the weight or the unique properties or the contact area of an object or with/without air. Furthermore students' explanations, frequently, changed with context of problems of a buoyant force. Scheffe test of quantitative results that elementary students in the concrete level had 50.6% of concept formation in a buoyant force, the transitional level 54.5%, and in the formal operational level 62.8% showed significant differences of conceptions of a buoyant force with cognitive levels. Therefore the concrete operational elementary students had more difficulties of understanding of a buoyant force than the transitional and formal level, which is required to higher cognitive levels. This conclusion have implications that the unit of a buoyant force have to be presented with concrete activities for majority of students who are in concrete and transitional levels.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제12권1호
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• pp.1-20
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• 2009

초등학생들의 수학문제해결과정에서 나타나는 직관적 사고는 오류를 일으키기도 하지만 강력한 문제해결 방법으로 작용하기도 한다. 이에 초등학생의 문제 해결과정에서 나타나는 직관적 사고를 관찰하여 분석하여 다음과 같은 결론을 얻을 수 있었다. 첫째, 학생들은 문제해결 과정에서 문제의 계산 절차나 알고리즘을 알고 있는 경우, 직관적 사고에 의존하기보다는 알고리즘에 의한 풀이에 의존하려는 경향을 보였다. 둘째, 학생들은 직관적 사고를 통한 시각적 모델을 구안하여 문제를 해결하는 능력이 떨어지며, 시각적 모델을 사용하여 문제를 해결한다 하더라도 자신의 답에 대한 확신감이 떨어진다. 셋째, 문제해결 과정에서 직관적 사고와 논리적 사고 사이에 상호 보완관계가 나타났다. 넷째, 확률의 개념과 확률에 관한 문제해결 과정에서 학생들은 자신의 주관적 해석을 통한 인식론적 장애를 일으켰다.

• 전자공학회논문지CI
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• 제48권1호
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• pp.127-132
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• 2011

본 논문은 입력된 영상으로부터 적응적 피부색 검출 방법으로 생성된 피부색 영역과 에지 정보의 결합을 특정 벡터로 이용하여 입력 영상의 유해(누드, 성인물) 여부를 판별하는 방법을 제안한다. 제안하는 방법은 네 단계의 과정으로 이루어져 있다. 첫 번째 단계에서는 입력 영상으로부터 기존의 피부색 검출 방법들을 적용하여 얻은 모든 결과 영상들에 대해서 논리곱 연산을 통해 초기 피부색 영역을 검출한다. 두 번째 단계에서 초기 피부색 영역의 화소 정보를 기반으로 피부색 확률 분포 모델을 생성하고 이를 통해 피부색 확률 영상을 생성한다. 그리고 피부색 확률 영상에 임계값을 적용하여 이진화 한다. 세 번째 단계에서 이진 피부색 영역과 에지의 결합 영상을 생성하고 피부색 영역을 확산하여 최종 피부색 영역을 검출한다. 마지막 단계에서 최종 피부색 영상과 최종 피부색 영역 안에 있거나 인접한 에지들의 결합 영상을 특정 벡터로 생성한다. 생성된 특정 벡터를 support vector machine(SVM) 학습을 통해 생성된 분류 모텔로 입력 영상의 유해 여부를 판별하여 유해 혹은 무해 영상으로 분류한다. 실험 결과를 통하여 제안하는 방법이 기존의 유해 영상 분류 방법에 비해 분류 성능이 9.6% 향상된 것을 확인하였다.