• 한국컴퓨터정보학회논문지
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• 제21권1호
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• pp.9-16
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• 2016

In this paper, we present a performance evaluation agent based on fuzzy cluster analysis and validity measures. The proposed agent is consists of three modules, fuzzy cluster analyzer, performance evaluation measures, and feature ranking algorithm for feature selection step in CAD system. Feature selection is an important step commonly used to create more accurate system to help human experts. Through this agent, we get the feature ranking on the dataset of mass and calcification lesions extracted from the public real world mammogram database DDSM. Also we design a CAD system incorporating the agent and apply five different feature combinations to the system. Experimental results proposed approach has higher classification accuracy and shows the feasibility as a diagnosis supporting tool.

• International Journal of Computer Science & Network Security
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• 제21권11호
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• pp.49-58
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• 2021

Globalization of higher education deepens the competition in the global educational services market. Competition between higher education institutions is based on the use of a wide range of activities and tools that are constantly evolving and becoming more complex. Digitalization significantly transforms the approaches to competition between universities in educational, research and marketing activities. Digital technologies are becoming an integral part of this competition. In addition, in the current conditions of globalization of the scientific and educational space, numerous rankings of universities have become an important tool of the competition; the most significant rankings of universities are as follows: Academic Ranking of World Universities (China), Times Higher Education Rankings of Universities (Great Britain), Webometrics (Spain). In the article, the key principles of the formation of world rankings of universities are analyzed, the main sources of information resources for their compilation are determined. The authors have concluded that the improvement of the position of educational institutions in the world rankings of universities should be implemented within the framework of the state educational policy. The key positive effects of universities due to increasing the competitiveness level of the national higher education system are specified.

• East Asian Economic Review
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• 제23권1호
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• pp.89-107
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• 2019

This paper ranks higher education in Korea based upon research productivity in business and economics disciplines. The number of SCI-level journal articles are tabulated using the Web of Science search engine, over the sample period from 1990 to 2016. The league table shows that many private universities dominate top-tier ranks, which is consistent with the school reputations most commonly cited by the general public in Korea. In contrast, many national universities appear in the second-tier, and their scanty performance in business and economics is in sharp contrast with our earlier findings in which national universities performed well in science and engineering fields (Jin and Kim, 2018). In addition, the ranking order in lower-ranked schools is found to be sensitive to a small change in publications, whereas the publication gap among top-tier schools is relatively large. Finally, unlike our general perception, the size of school does not matter for collaborative research. Some policy implications are discussed as a conclusion.

• 한국통신학회논문지
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• 제33권4A호
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• pp.403-410
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• 2008

본 논문에서는 공간다중화 방식을 사용하는 다중 안테나 시스템의 수신부에서 사용가능한 QRM-MLD 신호검출기법을 위한 새로운 변형된 형태를 제안한다. 원래의 QRM-MLD 신호검출 기법은 채널의 QR분해 및 M-algorithm을 결합한 형태로써, ML 수신기법에 비해 상대적인 복잡도가 현저하게 낮아지면서, ML에 근접한 성능을 보이나, 전송속도를 높이기 위해 안테나 개수가 증가하거나 성상도의 크기가 증가하면 그 복잡도가 크게 증가하여 하드웨어 구현을 어렵게 하는 단점을 가지고 있다. 이러한 단점을 극복하기 위해 다양한 변형된 형태가 제안되었고, 대표적인 방법으로 성상점들을 ranking화하여 필요한 성상점에 대해서만 연산을 수행함으로써 복잡도를 감소시키는 방법이 있다. 그러나, 성상점들의 ranking화를 사용하는 QRM-MLD 방식의 성능이 원래의 QRM-MLD의 성능에 비해 현격히 저하된다. 본 논문에서는 ranking화를 사용하는 QRM-MLD의 신호검출 기법이 성능열화를 겪게 되는 이유를 분석하고, 이를 극복함으로써 새로운 변형된 형태의 QRM-MLD기법을 제안한다. 모의실험을 통해 제안된 방식의 성능을 기존 방법들과 비교하여, 제안된 방식이 원래의 QRM-MLD 신호검출방식의 성능을 달성하면서 복잡도는 ranking화를 사용하는 QRM-MLD기법과 유사하다는 것을 보인다.

• 한국지역사회생활과학회지
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• 제15권3호
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• pp.167-177
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• 2004

This study is designed to understand purchase motivation for garment depending on demographic factors among college students in Yanbian, China. Questionnaire was used for measurement tools to study the subject of the thesis. The main study was conducted against 450 college students from May 17 to June 5, 2001. The data for the study were analyzed using SAS PC program for frequency distribution, percentage, t -test, and one way ANOVA. The purchase motivation for garment are affected by demographic factors such as gender, average monthly household income, monthly expense for clothing. The result was showed as follows: A meaningful difference showed in 3 areas 'to try a new trend, impulsive buying at the store display, discount advertising' depending on the gender in terms of purchase motivations, and in all the three areas, male students showed a higher ranking. But in other motivation areas, no difference was noticed in terms of gender. In terms of purchase motivation based on monthly income, only one area 'impulse buying from a store display' showed a meaningful difference. Respondents with an average monthly household income above 2,000 yuan showed a higher tendency of 'impulse buying' compared to those with below 500 yuan or those with between 500-2,000yuan. Those with the average monthly household income below 500 yuan showed the lowest ranking in the impulse buying. In other areas of purchase motivation, average monthly household income was not an important element. A meaningful difference showed in 4 areas, 'to try a new trend, impulse buying from a store display, discount advertising', and 'for a change of mood' in the product motivation based on expense on clothing. Respondents with an average monthly expense for clothing above 100 yuan showed a higher ranking in all 4 areas than those with less than 100 yuan. In other areas, the average monthly clothing expense didn't give any impact.

• 인터넷정보학회논문지
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• 제17권3호
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• pp.87-93
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• 2016

현대 지식정보사회에서 정보통신기술은 개인, 사회 및 국가적 차원에서 매우 중요하다. 특히 국가적 차원에서 있어서 정보통신기술관련산업은 매우 중요한 비중을 차지하고 있으며, 다른 산업과는 달리 다양한 기반시설을 필요로 하지 않으며 소수의 인재들에 의하여 단기간에 부흥할 수 있는 장점이 있다. 이러한 관점에서 정보영재 발굴과 교육은 국가의 미래에 있어서 매우 중요한 과제가 되어가고 있다. 과거의 영재교육의 선발은 주로 지필고사를 통해 실시되었으나, 사교육 등 다양한 폐해로 인해 2013년 이후로 관찰추천제 방식이 전면적으로 실시되었다. 본 연구의 목적은 정보영재아동의 관찰추천제 입학제도의 타당성을 분석하는 것이다. 이러한 연구목적을 위해 서울시의 한 대학부설 과학영재교육원에 재학한 정보영재아동들을 대상으로 입학성적과 수료성적의 상관관계 분석을 통해서 관찰추천제의 타당성을 분석하였다. 통계처리결과 정보영재아동은 입학성적과 수료성적의 상관관계를 보였다. 즉 정보영재아동의 경우 입학성적이 좋으면 수료성적이 좋음을 보였다. 본 연구결과는 향후 영재교육에 있어서 관찰추천제의 유용성을 판단하는 데 귀중한 자료가 될 것으로 기대한다.

• 정보관리학회지
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• 제10권2호
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• pp.3-22
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• 1993

최근 시소러스를 기반으로 하는 불리안 검색 시스템에서 문서의 순위 결정에 사용 될 수 있는 Relevance, R-distance, K-distance와 같은 방법들이 개발되었다. 이러한 방법들은 색인어들 사이의 연관성 정보를 이용하여 문서들의 순위를 결정함으로써 많은 경우에 높은 검색 효율을 제공할 지라도, 불리안 연산자 AND, OR, NOT에 대한 연산 방법이 문제점으로 지적되어왔다. 본 논문에서는 개선된 퍼지 집합 모델과 확장된 불리안 모델을 시소러스가 제공하는 색인어들 사이의 연관성 정보를 효율적으로 이용할 수 있도록 확장함으로써, 기존 방법들의 문제점을 극복하는 새로운 순위 결정 방법 KB-FSM과 KB-EBM을 제안한다. 또한 KB-FSM과 KB-EBM이 Relevance, R-distance, K-distance보다 문서들의 순위를 보다 정확하게 결정함을 성능 비교를 통하여 입증한다.

• 한국항만경제학회지
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• 제35권1호
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• pp.117-138
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• 2019

세계적 수준인 우리나라 해운물류산업에 비해, 해운물류 연구 실적에 대한 평가는 다소 불분명하다. 본 연구는 우리나라 해운물류분야의 상위 30명의 연구자와 30개의 기관을 분석했다. 분석은 2000년부터 2015년까지 16년간 해운 및 운송 관련 65개 SSCI 및 SCI 학술지에 게재된 논문을 대상으로 했다. 순위를 산정하기 위해 다음과 같은 세 가지 지표를 사용했다: 1) 논문의 수, 2) 저자들의 기여도를 반영한 가중 점수(Weighted Score), 3) 학술지의 Impact factor를 고려한 영향력 점수. 시간의 흐름에 따른 각 기관과 연구자의 순위 변화를 5년을 주기로 측정했다. 또한, 우리나라 해운물류 연구가 세계 해운물류 분야에서 차지하는 비중을 분석하였다. 끝으로, 우리나라 연구자들의 방법론적 선호도를 세계 연구자들과 비교 및 분석하였다.

• 상하수도학회지
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• 제35권6호
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• pp.517-531
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• 2021

The water supply facilities of Korea have achieved a rapid growth, along with the other social infrastructures consisting a city, due to the phenomenon of urbanization according to economic development. Meanwhile, the level of water supply service demanded by consumer is also steadily getting higher in keeping with economic growth. However, as an adverse effect of rapid growth, the quantity of aged water supply pipes are increasing rapidly, Bursts caused by pipe aging brought about an enormous economic loss of about 6,161 billion won as of 2019. These problems are not only worsening water supply management, also increasing the regional gap in water supply services. The purpose of this study is to classify hazard evaluation indicators and to rank the water distribution network hazard by cluster using the TOPSIS method. In conclusion, in this study, the entropy-based multi-criteria decision-making methods was applied to rank the hazard management of the water distribution network, and the hazard management ranking for each cluster according to the water supply conditions of the county-level municipalities was determined according to the evaluation indicators of water outage, water leakage, and pipe aging. As such, the hazard ranking method proposed in this study can consider various factors that can impede the tap water supply service in the water distribution network from a macroscopic point of view, and it can be reflected in evaluating the degree of hazard management of the water distribution network from a preventive point of view. Also, it can be utilized in the implementation of the maintenance plan and water distribution network management project considering the equity of water supply service and the stability of service supply.

• Journal of Nutrition and Health
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• 제28권8호
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• pp.791-799
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• 1995

Agreement between open question and closed question on portion size of a food frequency questionnaire was assessed for the influence by the restricted choices in closed question on estimated nutrient intakes and agreement of ranking individuals. Dietary intakes of 361 subjects in a rural country, Yang-pyeung Gun were obtained using a interview method. The results are as follows ; 1) Nutrients intakes calculated from closed question on portion size were lower than those calculated from open question on portion size. 2) For most nutrients the percentage of Korean RDA were significantly lower with closed question than open question. 3) Correlation coefficient of nutrient intakes and food intakes obtained by two methods were higher than 0.6 for all nutrients and food items. 4) For each nutrient, misclassification into extreme quartiles was less than 1 percent. 5) These data indicate that closed question on portion size can provide the corresponding information as open question if food frequency questionnarie is used for the ranking of individuals.