• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제12권4호
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• pp.179-188
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• 2023

최근 가짜뉴스는 뉴스 콘텐츠 형식을 가장하고 중요한 사건이 발생할 때마다 등장하여 사회적 혼란을 초래한다. 이에 가짜뉴스를 탐지하기 위한 연구로 인공지능 기술이 사용된다. 자연어 처리를 통해 가짜뉴스를 자동으로 인지 및 차단하거나, 네트워크 인과 추론과 결합함으로써 허위 정보를 확산시키는 소셜미디어 인플루언스 계정을 감지하는 등의 가짜뉴스 탐지 접근법이 딥러닝을 통해 구현될 수 있었다. 그러나 가짜뉴스 탐지는 여러 자연어 처리 분야 중에서도 해결이 어려운 문제로 분류된다. 가짜뉴스가 가지는 형식 및 표현의 다양성으로 특성 추출의 난도가 높고, 뉴스가 속한 범주에 따라 하나의 특성이 서로 다른 의미를 가질 수도 있는 등 다양한 한계점이 존재한다. 본 논문에서는 가짜뉴스를 탐지하기 위한 추가적인 식별 기준으로 감성 변화 패턴을 제시한다. 합성곱 신경망을 가짜뉴스 데이터 세트에 적용하여 콘텐츠 특성에 기반한 분석을 수행하고, 감성 변화 패턴을 추가로 분석함으로써 성능이 개선된 모델을 제안한다. 뉴스를 구성하는 문장에 대하여 감성 극성을 산출하고 장단기 메모리를 적용함으로써 문장 순서에 의존적인 결괏값을 얻을 수 있다. 이를 감성 변화의 패턴으로 정의하고 뉴스의 콘텐츠 특성과 결합하여 가짜뉴스 탐지를 위한 제안 모델의 독립변수로 활용한다. 제안 모델과 비교 모델을 딥러닝으로 학습시키고 가짜뉴스 데이터 세트를 이용한 실험을 진행하여 감성 변화 패턴이 가짜뉴스 탐지 성능을 개선할 수 있음을 확인한다.

• 복식문화연구
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• 제2권1호
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• pp.167-186
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• 1994

The purpose of his study is to investigate the relationship between the business cycle and the fashion of silhouette from 1956 to 1992. Correlation analysis an regression analysis were used to investigate the relation of them. In this study, the coincident composite index was used as business cycle and change of skirt in length and width, collar and pants in width wee thoroughly checked through graphs and photographs. The results of analysis are as follows. 1. When the economy is to ascend, the skirts are short and narrow. On the country, when the economy is descend, they are long and wide. 2. The business cycle gives influence on skirts line and with, that is, about 18%, 33% of total changes. 3. In change of fashion, skirts length and width had significant positive correlation and they showed a tendency to move together. On the other hand, the change of collar and patterns in width have no connection with business fluctuation. 4. The change of fashion is affected by the movement of itself. According to analysis that includes the trend of skirts, about 50%, and 35% of changes in skirts length and width were decided by them,. and about 52% and 35% of change in collar and patterns width were decided by them.

• 한국기계가공학회지
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• 제15권4호
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• pp.8-15
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• 2016

Most machines lose a lot of energy due to friction. Wear due to friction also reduces performance. Therefore, it is important to reduce friction on the surface to improve energy efficiency and decrease wear. Surface texturing refers to making patterns on the surface for reducing friction. There are many surface texturing methods, such as using lasers, abrasive jet machining, and so on. Recently, mechanical manufacturing methods, such as cutting and grinding, have been highlighted. Among them, the grinding method has the advantage of making patterns in large areas quickly. Therefore, it is appropriate for surface texturing on large machines. This paper is a study on the slope change of the surface texturing pattern using grinding. Therefore, we researched the slopes of the patterns corresponding to "spindle speed and feed rate" and "curvature of workpiece surface" using a mathematical model and experiment. As a result, we made a proper mathematical model concerning our research. Therefore, using the mathematical model in this paper, we could predict the slope change of the pattern according to grinding conditions.

• 한국구조물진단유지관리공학회 논문집
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• 제12권5호
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• pp.116-124
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• 2008

본 연구에서는 원형수직구 굴착에 따른 Ring Beam의 거동을 평가하기 위하여 현장계측 자료의 분석과 평가, 굴착심도 변화에 따른 Ring Beam의 응력 특성 등의 비교분석을 구조해석에 기초하여 평가하였다. 그 결과, Ring Beam의 거동은 현장계측 및 구조해석 결과에서 유사한 경향을 나타내는 것을 알 수 있었다. 이로부터 굴착심도 변화에 따른 Ring Beam 거동은 본 연구에서 제안한 구조해석에 의해 예측할 수 있는 것을 확인하였다.

• 농촌계획
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• 제23권2호
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• pp.67-74
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• 2017

Migration is defined as the movement of people between residential places, and represents interactions between regions. Changes in migration involve changes in both the number of migrants toward/from regions and migration patterns across regions. However, most migration studies have focused only on the change in migrants, while no empirical study captures changes in migration patterns. In this paper, I present a function using the cosine similarity to measure changes in migration patterns, and apply it to 2001-2016 migration data of Korea. The results show that the migration patterns of Korea shifted in 2007, resulting in two distinct clusters. Local areas experienced various migration pattern changes despite few changes in the number of migrants.

• 재무관리연구
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• 제26권4호
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• pp.141-163
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• 2009

Using the extensive datasets, I analyze the effect of tick size changes on the intraday patterns of spread and depth. I show that intraday variations in spread (depth) are greater (smaller) with smaller tick size during the early hour of trading and become smaller (larger) during the last hour of trading. And the standardized spreads (depths) are quoted at the lower (higher) levels as the tick size becomes smaller. I also find that U-shaped intraday spread pattern changes to the reverse flat S-shape while inverted U-shaped depth pattern does to the flat S-shape.

• 한국주거학회논문집
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• 제17권5호
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• pp.159-167
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• 2006

This study is analyzed comparison about the component ratio of dwelling space in the existing plan and residents dwelling needs. Also, it is analyzed the residence factors of area component change that residence satisfaction and importance according to the behavioral patterns of residents. The results are as follows. 1) Total area component ratio of the existing plan was 39.5:40.8:19.7% and dwelling consciousness one was 36.4:44.0:19.6%. Compared private space with public space, public area requested increase rather than private area. 2) In the 17, 19pyung-types dwellers are not happy about dining kitchen and utility room and types of 21, 23pyung-types are dissatisfied in room-2 and room-3, living room and dining kitchen are dissatisfied, too. In case of areas over 25pyung-types are dissatisfied in room-3 and room-4. 3) The behavioral patterns of apartment residents were classified six acts, and the most significant factors are appeared associated the acts of ceremony, relation of neighborship, and reception. The next significant factors are appeared associated the acts of family relation, about food life. So, it is concerned with the scale of public room.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제31권4호
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• pp.214-224
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• 2020

Objectives: This study aimed to examine the trend in diagnostic prevalence of psychiatric disorders in children and adolescents. Methods: Individuals aged 0-18 years were included in the study based on the National Health Insurance Claims Data. To investigate the trends in diagnosis and diagnostic prevalence of psychiatric disorders reflecting the decrease in the birth rate, data were analyzed from 2010 as a reference year to 2015. Results: The number of patients diagnosed with psychiatric disorder decreased annually, from 23,412 on 2010 to 18,821 on 2015. The most common disorder was hyperkinetic disorder in male and depressive episode in female. Although there was no significant change in overall diagnostic prevalence rate of psychiatric disorders, age groups <10 years and some disorders had significant changes in prevalence rate. This study classified the diagnostic prevalence by age into two unique patterns: group in which the diagnosis rate increases with age and group in which the diagnosis rate peaks at a certain age and then decreases. Conclusion: Diagnostic prevalence of psychiatric disorders was different according to age and sex. These patterns should be reflected in the formulation of policies related to mental health and in medical practice for pediatric patients. It is urgent to identify how these patterns change in young adults.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.716-718
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• 2004

The false alarm data in intrusion detection systems are divided into false positive and false negative. The false positive makes bad effects on the performance of intrusion detection system. And the false negative makes bad effects on the efficiency of intrusion detection system. Recently, the most of works have been studied the data mining technique for analysis of alert data. However, the false alarm data not only increase data volume but also change patterns of alert data along the time line. Therefore, we need a tool that can analyze patterns that change characteristics when we look for new patterns. In this paper, we focus on the false positives and present a framework for analysis of false alarm pattern from the alert data. In this work, we also apply incremental data mining techniques to analyze patterns of false alarms among alert data that are incremental over the time. Finally, we achieved flexibility by using dynamic support threshold, because the volume of alert data as well as included false alarms increases irregular.

• 대한기계학회논문집B
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• 제28권9호
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• pp.1042-1050
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• 2004

Theoretical study has been conducted to clarify pressure characteristics of KTX(Korea Train eXpress) in tunnel. The severe pressure change in tunnel may give rise to the ear-discomfort for passenger and fatigue for car body. The external and internal pressure of rolling stock have been measured by using the running test with atmospheric pressure sensors and portable data acquisition system in high speed train. In this study, the tunnels from 200m to 4000m in length have been chosen for the investigation of tunnel length effects. We found that there are similar patterns of external pressure change for each critical tunnel length. The critical tunnel lengths are governed by train speed, train length and sonic velocity. And, the patterns of pressure wave in tunnel are classified into eight groups.