• Imaging Science in Dentistry
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• 제47권3호
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• pp.149-155
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• 2017

Purpose: The classification of impacted maxillary third molars(IMTMs) facilitates interdisciplinary communication and helps estimate the degree of surgical difficulty. Thus, this study aimed to develop a 3-dimensional classification of the position and depth of impaction of IMTMs and to estimate their prevalence with respect to gender and age. Materials and Methods: This cross-sectional retrospective study analyzed images in sagittal and coronal cone-beam computed tomography (CBCT) sections of 300 maxillary third molars. The proposed classification was based on 3 criteria: buccolingual position (buccal, lingual, or central), mesial-distal position (mesioangular, vertical, or distoangular), and depth of impaction (low, medium, or high). CBCT images of IMTMs were classified, and the associations of the classifications with gender and age were examined using analysis of variance with the Scheffe post-hoc test. To determine the associations among the 3 classifications, the chi-square test was used (P<.05). Results: No significant association of the classifications with gender was observed. Age showed a significant relationship with depth of impaction (P=.0001) and mesial-distal position (P=.005). The most common positions were buccal(n=222), vertical(n=184), and low (n=124). Significant associations among the 3 tested classifications were observed. Conclusion: CBCT enabled the evaluation of IMTMs in a 3-dimensional format, and we developed a proposal for a new classification of the position and depth of impaction of IMTMs.

• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.830-839
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• 2017

Support vector machine (SVM) is introduced as an effective fault diagnosis technique based on dissolved gases analysis (DGA) for oil-immersed transformers with maximum generalization ability; however, the applicability of the SVM is highly affected due to the difficulty of selecting the SVM parameters appropriately. Therefore, a novel approach combing SVM with improved imperialist competitive algorithm (IICA) for fault diagnosis of oil-immersed transformers was proposed in the paper. The improved ICA, which is proved to be an effective optimization approach, is employed to optimize the parameters of SVM. Cross validation and normalizations were applied in the training processes of SVM and the trained SVM model with the optimized parameters was established for fault diagnosis of oil-immersed transformers. Three classification benchmark sets were studied based on particle swarm optimization SVM (PSOSVM) and IICASVM with four multiple classification schemes to select the best scheme for transformer fault diagnosis. The results show that the proposed model can obtain higher diagnosis accuracy than other methods. The comparisons confirm that the proposed model is an effective approach for classification problems.

• 한국컴퓨터정보학회논문지
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• 제26권1호
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• pp.163-170
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• 2021

빅데이터가 여러 분야에서 다양하게 접목됨에 따라 빅데이터 시장이 하드웨어로부터 시작해서 서비스 소프트웨어 부문으로 확장되고 있다. 특히 빅데이터 의미 파악 및 이해 능력, 분석 결과 등 총체적이고 직관적인 시각화를 위하여 애플리케이션을 제공하는 거대 플랫폼 시장으로 확대되고 있다. 그 중에서 SNS(Social Network Service) 등과 같은 소셜 미디어를 활용한 빅데이터 추출 및 분석에 대한 수요가 기업 뿐만 아니라 개인에 이르기까지 매우 활발히 진행되고 있다. 그러나 이처럼 사용자 트렌드 분석과 마케팅을 위한 소셜 미디어 데이터의 수집 및 분석에 대한 많은 수요에도 불구하고, 다양한 소셜 미디어 서비스 인터페이스의 이질성으로 인한 동적 연동의 어려움과 소프트웨어 플랫폼 구축 및 운영의 복잡성을 해결하기 위한 연구가 미흡한 상태이다. 따라서 본 논문에서는 소셜 미디어 데이터의 수집에서 추출 및 분류에 이르는 과정을 하나로 통합하여 운영할 수 있는 프레임워크를 개발하는 방법에 대해 제시한다. 제시된 프레임워크는 이질적인 소셜 미디어 데이터 수집 채널의 문제를 어댑터 패턴을 통해 해결하고, 의미 연관성 기반 추출 기법과 주제 연관성 기반 분류 기법을 통해 소셜 토픽 추출과 분류의 정확성을 높였다.

• 기록학연구
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• 제3호
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• pp.65-89
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• 2001

We, at The Korea Democracy Movement Archives opened temporarily at SungKongHoe University(SKHU), have currently collected about 100,000 recorded materials of democratization movement related with labor, farmer, civilian, human rights, peace, unification, young people, student and women's movements by investigating, collecting and receiving donations from civil organizations and individuals, and about 70,000 data out of this 100,000 data were converted into computer files. The Korea Democracy Movement Archives(temp) at SKHU has a significance in that it is the first archive opened by an organization. Furthermore, the opening of this Archive means the expansion of awareness on recording culture and accumulation of the achievements of the democratization movement in Korea. However, many obstacles still remain in the establishment of this Archive in a full-scale. This article examined many theoretical and realistic obstacles posed to the archivists, who are the professionals responsible for record management, in process of establishing the Archive, and the role and future perspectives of the archivists at The Korea Democracy Movement Archives(temp). The first obstacles in the process of organizing and separating the recorded materials at the Archive is a difficulty in the description of classifying the different movement organizations. The second obstacle is a difficulty in specifically applying the international standard, ISAD(G), of record description in the process of establishing the description items. Through many trials and errors, we need to try to confirm the description befitting. The Korea Democracy Movement Archives through continuous adjustment and complementary measures. The third obstacle is a difficulty in estimating the range and physical and quantitative amount of the recorded materials since the collection of recorded materials is complete. Thus, the answers to these problems lie in continuous efforts to establish a creative classification system befitting the democratization movement in Korea in the process of many trials and errors and endeavor. The evaluation classification done by archivists is a creative act forming record heritage, and archivists need to form record heritage reflecting the evaluation system of a certain period. Moreover, they transmit the shape of the current era in a maximum scale to the future by using the minimum amount of records. An archivist is responsible for two tasks, i.e., preserving a record and making other people to utilize the record by working with record. However, We, at The Korea Democracy Movement Archives(temp), have an additional task of contributing to the democratization movement in korea that has not ended by collecting, preserving and making people to utilize the fragments of memory in the recent history of Korea by establishing the Archives.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제22권9호
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• pp.455-460
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• 2016

최근 강도, 성폭력과 같은 중범죄들의 수위가 높아짐에 따라 범죄 예측 및 예방에 대한 중요성이 강조되고 있다. 정확한 범죄예측을 위해서는 과거 범죄기록 데이터를 기반으로 정확도 높은 범죄분류모델을 만드는 작업이 필요하며, 신속한 범죄 대응을 위한 시스템 인터페이스가 요구된다. 그러나 기존의 범죄 요소 분석 연구는 데이터 전처리에 대한 난해함으로 인해 정확도 측면에서 한계를 보이며, 범죄 모니터링 시스템은 방대한 양의 범죄 사건기록 분석 결과를 단순 제공함으로써 사용자에게 효과적인 모니터링 기능을 제공하지 못하고 있다. 따라서 본 연구는 실시간 범죄 예측을 위한 랜덤 포레스트 알고리즘 기반의 범죄 유형 분류모델 및 시스템 인터페이스 디자인 요소를 제안한다. 실험을 통해 본 연구는 제안하는 모델이 단순히 범죄기록 데이터만으로 범죄유형을 분류하는 모델 보다 우수함을 입증하였고, 기존의 범죄 모니터링 시스템 분석을 통해 실시간 범죄 모니터링을 위한 시스템 인터페이스를 설계 및 구현하였다.

• 한국컴퓨터정보학회논문지
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• 제29권3호
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• pp.43-54
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• 2024

최근 언어모델을 활용하기 위한 연구가 활발히 이루어지며, 큰 규모의 언어모델이 다양한 과제에서 혁신적인 성과를 달성하고 있다. 하지만 실제 현장은 거대 언어모델 활용에 필요한 자원과 비용이 한정적이라는 한계를 접하면서, 최근에는 주어진 자원 내에서 모델을 효과적으로 활용할 수 있는 방법에 주목하고 있다. 대표적으로 학습 데이터를 난이도에 따라 구분한 뒤 순차적으로 학습하는 방법론인 커리큘럼 러닝이 주목받고 있지만, 난이도를 측정하는 방법이 복잡하거나 범용적이지 않다는 한계를 지닌다. 따라서, 본 연구에서는 신뢰할 수 있는 사전 정보를 통해 데이터의 학습 난이도를 측정하고, 이를 다양한 과제에 쉽게 활용할 수 있는 데이터 이질성 기반 커리큘럼 러닝 방법론을 제안한다. 제안방법론의 성능 평가를 위해 국가 R&D 과제 전문 문서 중 정보통신 분야 전문 문서 5,000건, 보건의료전문 문서 데이터 4,917건을 적용하여 실험을 수행한 결과, 제안 방법론이 LoRA 미세조정과 전체 미세조정 모두에서 전통적인 미세조정에 비해 분류 정확도 측면에서 우수한 성능을 나타냄을 확인했다.

• 한국건설관리학회논문집
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• 제25권1호
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• pp.32-41
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• 2024

건설산업은 안전사고뿐 아니라 공기지연, 원가상승, 환경오염 등의 여러 복합적인 리스크가 발생하며 이를 해결하기 위한 관리기술이 필요하다. 그 중에서 프로젝트에 직접적인 영향을 미치는 공정리스크의 관리는 그 중요성에 비해 관련정보가 부족한 실정이다. 본 연구는 각 프로젝트마다 상이한 분류체계 사용으로 인한 리스크 정보검색의 어려움을 해소하기 위하여 MATM 터널 공정리스크분류체계를 개발하고자 하였다. 리스크수집은 기존 문헌검토와 Experience Mining 기법을 사용하였고 DB구축은 자연어처리 개념을 활용하였다. 분류체계의 구조는 자료의 호환성을 고려하여 기존 WBS 구조를 채택하였고, WBS의 공종과 연결된 RBS를 구축하였다. 연구결과 공종별 리스크를 쉽게 파악하고 리스크에 연결된 리스크특성과 리스크요인이 직관적으로 드러나는 리스크분류체계가 완성되었다. 구축된 분류체계의 활용성 검증결과 사용자의 키워드 입력으로 공종별 리스크와 리스크요인이 쉽게 식별되어 분류체계는 유효한 것으로 나타났다. 본 연구를 통해 NATM터널 계획 및 설계 시 작업공종에 따르는 리스크를 미리 식별하고 그 요인에 맞는 대응방안을 수립하여 비용과 공사기간의 증가를 방지하는데 기여할 수 있을 것으로 기대된다.

• 기록학연구
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• 제1호
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• pp.137-188
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• 2000

Korea was highly successful in maintaining a strong tradition of record preservation. However, Japanese imperialism and the Korean war over this century has seen a huge quantity of these once plentiful records either destroyed or relocated overseas. Many of Korea records remain in the custody of foreign archival institutions. Additionally, many records of foreign states concerned with korean affairs, for example, records of the Department of state, in the U.S.A., are of great relevance to Korean modern history. These records which exist in foreign countries are a necessary and invaluable resource in the advancement of Korea studies. After the 1980s, as research interest in Korean modern history increased gradually, much historical material related to Korea was extensively introduced, removed, collected from the U.S.A., Japan, Russia and China etc. by the efforts of pioneering scholars and institutions. Several attempts at collating and publishing this material have been made. Despite this encouraging result, individual scholars and institutions's efforts face problems in relation to removal of records. Firstly, it is repeated nonproductively to remove and collect the same records, for we didn't establish a comprehensive information system, through which the condition of foreign record removal and management is able to be administrated. Secondly, there is no system for arrangement, preservation, use of removed records. For example, finding aids, such as inventory, register, description, isn't prepared for user. A user may usually not understand an accurate context of their creation, preservation removal. Thirdly, almost institution has arranged the removed records among other materials and books. Each institution has a different classification criteria, too. These conditions seem to make a difficulty in national management. This study investigated how the materials for Korea history which has been removed from foreign countries should be managed for effective preservation and use. For these purpose, we investigated the present conditions of removal and management of these materials. Also, we investigated examples of the foreign state, U.S.A. and Japan to have a idea for removal and management policy. Then, This study propose a establishment of information network system as management policy. To administrate removing and managing records effectively, an idea that records belong to the public should be accepted commonly. The policy for management of the record is followings. Firstly, unification of classification is necessary. The records which were removed from foreign countries had better to be classified according to their origins of states and institutions. Secondly, Finding aids should be prepared for user. There are many accession aids such as catalog, register, inventory for user in archives. This will be a efficient method for management. When a record is removed, a card for description of contents must be composed. Thirdly, a digital input and network system establishment is necessary. It will help to manage a condition of removed records. A digital input and management system establishment is not just a project of digitalizing records. At present, various finding aids need to be introduced to make a database for records and archives. An search using only 'search engine' may make a difficulty in finding materials because such method is apt to have too much or little result. So, classification, arrangement, description, response-service should be integrated in these system. The recent technical advancement give a opportunity to realize this idea. Above all, these procedure should be archival process.

• 대한지구과학교육학회지
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• 제3권2호
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• pp.124-131
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• 2010

The purpose of this study is examine relationship of attribution styles and attitude toward Science and Science Process Skills of Science-gifted, to understand unique characteristics of the Science-gifted and to give useful information that can be use in develop special programs for the Science-gifted. The result of this study were as follows: First, there was no difference between genders. But there was a significant difference in attribution of luck. Second, there was a correlation between internal tendencies and Scientific attitude. Especially attribution of effort correlated with sub - constituent of Scientific attitude. Internal tendencies correlated with the Cognition in Scientific Professions that sub - constituent of the attitude toward Science. Third, There was a correlation between external tendencies and the interest activity in Science that sub - constituent of the attitude toward Science. There are correlations between sub - constituent of the attitude toward Science and sub - constituent of external tendencies that attribution of luck and interest in Scientific Professions, attribution of task difficulty and Cognition activity in Science. Fourth There was no correlation between Attribution styles and Science Process Skills. But Internal tendencies correlated with classification that sub - constituent of Science Process Skills. And classification correlated with attribution of ability that sub - constituent of external tendencies. Attribution of effort that sub - constituent of internal tendencies correlated with Science Process Skills.

• 대기
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• 제21권3호
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• pp.221-228
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• 2011

The nonlinear characteristics of summer monsoon intraseasonal oscillation (ISO) in precipitation, which is manifested as fluctuations in convection and circulation, is one of the major difficulty on the prediction of East Asian summer monsoon (EASM). The present study aims to identify the spatial distribution and time evolution of nonlinear phases of monsoon ISO. In order to classify the different phases of monsoon ISO, Self-Organizing Map(SOM) known as a nonlinear pattern recognition technique is used. SOM has a great attractiveness detecting self-similarity among data elements by grouping and clustering such self-similar components. The four important patterns are demonstrated as Meiyu-Baiu, Changma, post-Changma, and dry-spell modes. It is found that SOM well captured the formation of East Asian monsoon trough during early summer and its northward migration together with enhanced convection over subtropical western Pacific and regionally intensive precipitation including Meiyu, Changma and Baiu. The classification of fundamental large scale spatial pattern and evolutionary history of nonlinear phases of monsoon ISO provides the source of predictability for extended-range forecast of summer precipitation.