• KIPS Transactions on Software and Data Engineering
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• v.2 no.1
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• pp.1-6
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• 2013

For predicting defect-prone module in software, SVM classifier showed good performance in a previous research. But there are disadvantages that SVM parameter should be chosen differently for every kernel, and algorithm should be performed iteratively for predict results of changed parameter. Therefore, we find these parameters using Genetic Algorithm and compare with result of classification by Backpropagation Algorithm. As a result, the performance of GA-SVM model is better.

• Korean Journal of Cognitive Science
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• v.30 no.3
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• pp.105-132
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• 2019

This study quantitatively analyzed the speeches of the former 8 Presidents of the Republic of Korea. Unlike the previous studies, this study analyzed both the content word and the functional word related to the psychological phenomenon. In Study 1, six language style indicators such as clout, authenticity, presidentiality, cognitive complexity, femininity, and psychological health were developed. Also, as presidential speeches have been made recently, authenticity, presidentiality, psychological health tended to increase, but cognitive complexity tended to decrease. These tendencies were supported by linear trend analysis. The linguistic differences were distinct not only among individual presidents but also by groups based on the political orientation of the president. In the progressive presidential speech, more clout, cognitive complexity, femininity were observed. In contrast, more authenticity and presidentiality were observed in the conservative presidential speech. In Study 2, it was demonstrated whether the developed language style indicators show reliability in the most recent President's speeches. Finally, it was discussed that the relationship between language style indicators, fitness of the political tendency between the regime and the general public since 2000s, and the characteristics of femininity indicator.

• Journal of Advanced Navigation Technology
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• v.22 no.2
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• pp.49-56
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• 2018

As the energy generated by earthquake, tsunami, etc. propagates through the air and disturbs the electron density in the ionosphere, the perturbation can be detected by analyzing the ionospheric delay in satellite signal. The electron density in the ionosphere is affected by various factors such as solar activity, latitude, season, and local time. To distinguish from the anomaly, therefore, it is required to inspect the normal trend of the ionosphere. Also, as the perturbation magnitude diminishes by distance it is necessary to develop an appropriate algorithm to detect long-distance disturbances. In this paper, normal condition ionosphere trend is analyzed via IONEX data. We selected monitoring value that has no tendency and developed an algorithm to effectively detect the long-distance ionospheric disturbances by using the lasting characteristics of the disturbances. In the end, we concluded the $2^{nd}$ derivative of ionospheric delay would be proper monitoring value, and the false alarm with the developed algorithm turned out to be 1.4e-6 level. It was applied to 2011 Tohoku earthquake case and the ionospheric disturbance was successfully detected.

• Korean Journal of Social Welfare
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• v.58 no.1
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• pp.347-372
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• 2006

Drinking Problems among college students have been increasing and being severe social problems. When it is compared with other areas, the research about drinking problems of college students are rare. This study was to examine psychosocial factors influencing on problem drinking among college students. The sample size of this study was 414, which made it possible to do statistical inference. AUDIT was applicated to measure the drinking problems in college student. As statistical method, $X^2$-test, t-test, hierarchial multiple regression analysis were used. The main finding provided that drinking problem of college students was more severe than adult one. Especially binge drinking pattern was remarkable. Male student had many alcohol problems than female students. This study also revealed gender, religious activity, first drinking age, sensation -seeking, drinking motivation, parents' drinking problem, schoolwork record, peer influence had significant direct impact in problem drinking of college students. Based on the results of this study, the author suggested some practical implication and preventive program based on the results and added further study tasks.

• Informatization Policy
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• v.18 no.4
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• pp.103-137
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• 2011

The digital divide (DD) has been recognized as one of the most serious social and public policy issues to emerge from the rapid growth of computing facility, particularly in regard to Internet capabilities, over the past decade. In order to identify DD research trends and contributions, this research has adopted a bibliometric approach to quantitatively assess the research trends of the DD and also utilized information from related literature in the EV2 database from 2000 to 2011. The results show that the most frequently documented type of publications are journal articles, making up 55.2% of the total database of literature. English is the primary language (96.7%), and USA researchers have made the largest contribution (17.0%) to DD literature. Tokai University (Japan), Tilburg University (Netherlands), and Arizona State University (USA) rank as the top three author affiliations. Information technology, the Internet, and economic and social effects are the three top key words that appear in the related DD literature. The results also revealed various regional evidence, main topics, perspectives, frameworks, and solutions that were introduced in DD publications.

• Journal of the Korea Convergence Society
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• v.10 no.5
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• pp.51-61
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• 2019

The purpose of this study was to investigate the association between socioeconomic status and blood heavy metal concentration in Korean adult population using the Korea National Health and Nutritional Examination Survey(KNHANES 2013-2015). Multiple logistic regression analysis was used to determine the association between socioeconomic status and the blood heavy metal concentration. Positive association was found between education and income level and blood concentration of mercury while those of lead and cadmium were negatively associated education and income level in Korean adult population (P for trend <0.001). At the point of an increase in the prevalence of heavy metal concentrations in the blood, a national public health policy will be needed to address the inequity of health due to socioeconomic factors.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.212-212
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• 2021

지구온난화에 따른 가장 큰 영향 중의 하나인 해수면 상승은 인구 및 산업시설이 집중되어 있는 연안에 심각한 영향을 미칠 수 있다. 연안 저지대 범람, 하천과 지하수로의 해수 유입, 하천의 수위증가, 조석 및 퇴적물의 변화 등의 직접적 피해를 증가시키고(국립해양조사원, 2012; Nicholls, 2002; 오상명 등, 2011), 시설물의 설계고 추산 및 흐름, 파랑의 흐름에 영향을 미쳐 연안 시설물의 안정성이나 기능성에 영향을 미치는 것으로 알려지고 있다(윤종주·김상익, 2012). 기후변화에 관한 정부간 협의체(Intergovernmental Panel on Climate Change, IPCC)의 5차 보고서(2014)에 따르면, 1901~2010년 동안 전 지구 평균해수면 상승률은 1.7mm/year에 이르며, 1990년대 이후에 더 높은 해수면 상승률을 예측하였다. 우리나라의 경우, 2010년 말까지의 자료분석 결과에서 2.48mm/year의 연평균 해수면 상승률을 보여 전세계 평균상승률보다 훨씬 상회하는 것으로 보고되고 있다(정태성, 2014; 윤종주 등, 2012). 이와 같이 전 지구적 평균해수면의 변화와는 별개로 지역적 해수면 변동특성은 그 양상이 크게 다를 수 있으며, 이는 지구온난화와 같은 자연적인 요인 뿐만 아니라 지역별 다양한 인위적 요인(풍속, 기압, 연안역 개발정도 등)에 따라 지역적 해수면 상승이 크게 변화할 수 있다. 이에 본 연구에서는 국내 연안역에 분포한 조위관측소의 장기 관측자료(수위)를 이용하여 각 지역별 해수면의 상승경향을 분석하였으며, 동/서/남해안 및 제주권역은 권역별 조석특성이 현저하게 다른 특성을 보이므로 권열별로 구분하여 분석이 수행되었는데 우리나라 대부분의 관측지점에서 평균해수면이 증가하는 추세인 것으로 나타났다.

• Journal of Science Education
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• v.37 no.2
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• pp.278-293
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• 2013

The purpose of this study was to analyze the characteristics of multiple-choice test items used in assessment of high school integrated science according to 2009 revised curriculum. For the analysis of the tendency of item setting, we devised an analytic framework specific to integrated science, and analyzed the characteristics of items by applying the devised framework and item response theory. The results of the tendency of item setting revealed that most of items run counter to the intent of integrated science in terms of item resource, integration extent, and cognitive level, which means teachers are stick to separative method in teaching-learning and assessment of integrated science. The results of the analysis applying item response theory showed that item difficulty was appropriate and item discrimination was considerably high. However, there was no relevance between the tendency of item setting and qualitative characteristics of the items. We also discussed some agendas to improve the teaching-learning and assessment of integrated science based on the results of this study.

• Korean Journal of Legislative Studies
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• v.27 no.1
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• pp.5-40
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• 2021

This study attempts to analyze gender gaps in voter turnout for three different types of elections held since 2017 at the aggregate level using the Central Election Management Commission's turnout data, paying attention to the importance of women's voting. The findings are as follows. First, modern gender gaps in voter turnout at the aggregate level are confirmed in most regions regardless of election types. Second, the gender gap in turnout varies with age. The gender difference is verified in the "widowhood effect," where turnout decreases in the oldest-old. In the new voter group, modern gender gaps appear in most regions. The reversed gender difference in turnout in the late 20s, which reflects the Korean society's characteristics, is confirmed in all elections. Third, it is unclear whether the reverse gender gap in turnout becomes more pronounced in urbanized districts. As urbanization progressed, modern gender differences in voter turnout across age groups are observed at the population-based size level. Paradoxically, the modern gender gap tends to be weak and turns into the traditional gender gap in younger age groups (in the late thirties) in Gangnam-gu and Seocho-gu, the most modernized districts in Seoul. These results show that the modern gender gap in turnout is now a common phenomenon and continues to be strengthened by newly recruited voters in Korea. Thus we should pay more attention to female voters' political behavior and a new approach beyond the developmental theory to understand the causal mechanism to generate the modern gender gap in voter turnout.

• Electronics and Telecommunications Trends
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• v.3 no.4
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• pp.25-44
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• 1988

고속 및 광전자응용에 기반이 될 반도체들과 그 architecture 에 대한 연구 경향과 미래적 전망에 대하여 개괄적으로 살펴보았다. 주요점은 무기물 반도체에 두었고, 유기물 반도체 및 기타 반도체들은 필요한대로 언급할 뿐 넓게 다루지는 않았다. 우선 현대가 처한 정보처리의 전환기적 특성을 살핀뒤, 미래에 다가올 고속 및 광전자 정보처리의 필요성을 논하였다. 다음 전자와 광자의 특성을 비교해 보고, 이들의 매개체가 되는 반도체 재료와 소자들, 이들의 2차원적 집적과 3차원적 집적에 따른 제반문제, 해결점, 전망 등을 살펴 보았다. 결론적으로 점진적연구보다는 선진적연구의 필요성을 이야기하였다.