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Density-based Deep One-class Classificationfor Robust Anomaly Detection
윤도식,유재홍 한국품질경영학회 2023 한국품질경영학회 학술대회 Vol.2023 No.0
Anomaly detection (AD) is to differentiate patterns that deviate from the expected features of target class. One-class classification (OCC) methods have been widely used for anomaly detection, with recent attention being given to the deep neural network-based OCC techniques (end-toend manner). These manners have been also shown remarkable performance on unstructuredformatted data (i.e., image, video, and signal data) as well as structured data. However, they often tend to perform poorly performance in many real situation where the noisy data exist in the target class. To overcome this limitation, we propose a density-based deep OCC algorithm that calculate the relative density of the individual observations in their respective region. By doing so, our method can successfully construct decision boundary (hypersphere) because the noisy observations located in a spare region rarely influence to hypersphere construction, whereas the observations (target likely observations) located in a dense region have a strong influence to hypersphere construction. In order to demonstrate superior performance of our proposed method, we performed an experimental study both well-known benchmark datasets (MNIST, CIFAR-10, and STL-10) and vibration signal-formatted data collected from bearing simulator. Finally, we confirmed outstanding performance of our proposed methods from the experimental results.
국제기준 및 산업환경 변화에 대응한 의료기기 제조기업 품질경영 평가모델 개발
윤도식(Do-Sik Yoon) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.6
본 연구에서는 국제기준 및 산업환경 변화에 따른 의료기기 품질경영 평가모델, 즉 의료기기 제조기업의 품질경영시스템의 인허가와 상시점검에 필요한 평가기준의 구성요소를 도출하고, 이를 평가도구로 의료기기 제조기업에 적용하여 실행수준의 평가 및 경영성과에 미치는 영향을 검증하였다. 본 연구에서는 선행연구 검토, 전문가 면담조사에 따라 예비항목을 마련하고, 기획, 실시, 점검, 조치 등 4개 영역의 요인으로 대분류 항목을 정의한 후, 각각의 평가계층과 평가항목을 구성하였으며, AHP에 의한 가중치와 중요도를 산출하였다. 그 결과, 기획 요인에서는 책임의 명확화와 품질관리 목표설정의 항목, 실시 요인에서는 개별제품을 중심으로 한 요구사항의 관리 및 설계․개발 프로세스의 관리에 관한 평가항목, 점검 요인에서는 정보의 측정․분석에 대한 관리항목, 조치 요인에서는 인증기준 및 법규, 규제에 대한 검토항목이 상대적으로 중요하게 나타났다. 이에 도출된 평가모델을 평가도구로 삼아 의료기기 제조기업에 적용함으로써, 품질경영 실행수준의 평가와 경영성과에 미치는 영향을 조사․분석하였다. 연구대상 의료기기 제조기업들은 비교적 양호한 수준의 품질경영 실행수준을 보이고 있고, 이를 통해 일정수준의 경영성과를 얻고 있는 것으로 나타났다. 또한, 각 요인과 평가계층들이 대부분 경영성과에 유의한 영향을 미치는 것으로 분석되었다. 특히 의료기기 품질경영시스템은 인허가 취득이 주목적이지만, 인허가와 직접적인 관련이 없는 경영환경적 요소들이 중요하며, 기업 내 · 외부에서 이러한 요소들이 연계성을 갖고 통합적으로 운영되는 것이 효과적이라는 점을 알 수 있었다. This study developed a model to evaluate the quality management system of a medical device manufacturing company, and applied it to medical device manufacturers to understand the impact on business performance in response to international regulations and industry"s change. This study prepared preliminary items, defined four (4) major factors (Plan-Do-Check-Act) that consist of the evaluation layers and items per category according to prior research review and expert interview, and calculated the weight and importance using AHP. The study results showed that responsibility & authority and quality objective in Planning Category, product-related requirement and R&D in Doing Category, Measuring and monitoring in Check Category, and review of meeting Regulatory and regulation in Action Category are relatively more important factors. The evaluation model developed based on the calculated weight and importance to business performance was applied to medical device manufacturers to investigate and analyze the implementation level of QMS and its impact on business performance according to each category. Most medical device manufacturers to be studied showed a reasonable level of QMS and effective business performance. Almost all the evaluation layers and items in the four (4) factors had a significant influence on business performance. Although the medical device quality management system is aimed mainly at license acquisition, it is important that management environment factors not related directly to licensing and authorization are important to business performance, and it is effective when these factors are integrated and operated within and outside the manufacturer.
지니계수분해법을 이용한 농촌마을 시설물의 지역 격차 분석
박미정,윤도식,진현승,신민지 한국농촌계획학회 2014 농촌계획 Vol.20 No.3
This research aims to identify regional inequitable development through the analysis of facilities distribution pattern. This study describes the concepts underlying the application of the Gini's coefficient and decomposition method to measure the regional inequitable development in Sun-chang County, Jeonbuk Province, Korea. We used the facility data surveyed for three years, from 2010 to 2012 for facility distribution pattern that RDA surveyed. These data have been serviced on the web. The Lorenz Curve presents a graphical view of the inequitable facility distribution and the Gini's Coefficients quantifies the distribution pattern. And furthermore, Gini Decomposition represents intra regional inequalities. These applied techniques can describe how the local development affects other district and change regional inequalities.