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특수 데이터 집합에 대한 K-means clustering 알고리즘을 사용한 PCA 차원 감소
양혜리(Hye-Ri Yang ),윤희용(Hee-Yong Youn) 한국정보기술학회 2018 Proceedings of KIIT Conference Vol.2018 No.6
Dimensionality reduction 방식은 머신러닝을 수행할 때 메모리와 디스크 사용에 대한 비용을 줄일 수 있고 더 좋은 점은 머신이 학습하는 시간을 단축할 수 있다. 더 빠른 결과를 볼 수 있고 성능이 좋은 머신러닝 시스템을 만들 수 있게 된다. Dimensionality reduction 방식 중 Principal Component Analysis(PCA)는 변수들을 주성분(Principal Compoenet)이라 부르는 선형적인 상관관계가 없는 다른 변수들로 재 표현한다. PCA는 차원 축소에 대한 unsupercised 접근 방식이며 다 변수 데이터 집합의 변수 수를 대표 변수의 더 작은 집합으로 줄이기 위해 광범위 하게 적용된다. 본 논문에서는 PCA 알고리즘을 사용하여 특정한 dataset에 대한 dimensionality reduction을 수행한 다음 k-means clustering 알고리즘을 이용해 성능을 향상시키는 방법을 제안한다. Dimensionality reduction can reduce the cost of memory and disk usage when performing machine learning. And even better, it can speed up the machine learning time. It is possible to create a machine learning system with faster results and better performance. Principal Component Analysis (PCA) re-expresses variables as other variables that do not have a linear correlation called Principal Compoenet. PCA is an unsupercised approach to dimension reduction and is widely applied to reduce the number of variables in a multivariate dataset to a smaller set of representative variables. In this paper, we propose a method to improve the performance by using k-means clustering algorithm after performing dimensionality reduction for a specific dataset using PCA algorithm.
양혜리(Hye Ri Yang),이규혜(Gyu Hye Lee),이찬희(Chan Hee Lee) 대한자원환경지질학회 2023 자원환경지질 Vol.56 No.6
The tracksite of dinosaurs and pterosaurs in Sanbuk-dong of Gunsan is the largest early Cretaceous dinosaur footprint fossil site in Korea, and all the footprints are important evidence indicating that large ornithopod and theropod dinosaurs inhabited the Korean peninsula during the early Cretaceous. The Sanbuk-dong site was covered with waterproof sheet in an outdoor environment until the installation of a protective enclosure in 2021. As a result, various factors such as shear force, load reduction, temperature and humidity fluctuations, acid rain, salinity and microorganisms have complexly interacted in the substrate of fossils, exacerbating the damage to footprints. For 159 footprints in 12 trackways among the footprints found in the site, the damage types were classified in detail and the level of each damage was assessed. The damages were classified into 6 types through the classification of deterioration degree of individual footprints. As a result of ultrasonic physical property evaluation on the surface of the fossil site, most of these footprints are in the completely weathered (CW) stage. Furthermore, various weathering patterns were observed in the study area, and surface contaminants were analyzed along the stratigraphy. Although the patterns of freshness and contaminants varied at different points within the fossil site, the chemical compositions were similar. Based on the results, an efficient conservation management system for dinosaur footprint fossils was established, and a conservation treatment type for each footprint was proposed. 군산 산북동 공룡과 익룡발자국 화석산지는 국내 최대의 전기 백악기 공룡발자국 화석지이며, 모든 발자국은 대형 조각류와 수각류 공룡들이 전기 백악기에 한반도에 서식하였음을 지시하는 중요한 증거이다. 산북동 화석산지는 2021년 보호각 설치 이전까지 야외 환경에서 방수포로 보호되어 있었다. 이로 인해 화석의 기반암에는 전단력, 하중 감소, 온습도변화, 산성비, 염분 및 미생물 등이 복합적으로 작용하여 발자국의 손상이 가중되었다. 이 연구에서는 발자국 화석 중 형태 및 보행렬 확인이 가능한 12개 보행렬의 159개 발자국을 대상으로 각각의 손상정도를 평가하고 6개의 손상유형으로 분류하였다. 화석산지 전체 표면에 대한 초음파 물성평가 결과, 대부분 완전풍화단계(CW)를 보였다. 또한 연구대상 화석산지에는 다양한 풍화양상이 나타나 층준별 표면의 오염원을 분석한 결과, 화석산지의 신선부와 오염물은 지점별로 양상은 상이하나 조성은 거의 유사하였다. 이를 바탕으로 공룡 및 익룡발자국 화석산지의 효율적인 보존관리체계를 구축하였으며 각 발자국의 보존처리 유형을 제안하였다.
댐 상류 지역에서 발생하는 가축분뇨의 에너지 활용 잠재력 평가
양혜지 ( Hye-ji Yang ),김연권 ( Youn-kwon Kim ),김지연 ( Ji-yeon Kim ) 한국수처리학회 2022 한국수처리학회지 Vol.30 No.5
In Korea, surface water has been used as a main water resource; in particular, upstream areas are mainly used as drinking water sources. Unfortunately, these areas are exposed to many pollutants, of which livestock manure used as compost is becoming a significant pollutant during rainfall events. The aim of this study is to evaluate the utilization of livestock manure generated in the upstream areas of adam as an energy resource. Anaerobic digestion processes are used for the biological degradation of organic wastes and for biogas generation. Therefore, in this study, the energy potential of livestock manure was evaluated for the prevention of inflow into the water bodies based onfour themes: the comparison of biogas generation by various types of livestock manure, the evaluation of the energy potential of livestock manure as a solid refuse fuel after anaerobic digestion, the composting period's effect on the biogas generation yield, and the ammonium nitrogen inhibition. The amount of biogas produced by cattle manure that lacked organic matter was the lowest, but it had the highest low calorific value of about 3,500 kcal/kg, which means that it can be used as a combustion aid substrate . It can be noted that the amount of biogas generated decreased due to the decomposition of organic matter as a result of the composting of cattle manure.
신체이미지와 쾌락적 쇼핑성향 및 스키니 진 구매 시 정보원 활용의 관계 연구
양혜인 ( Hye-in Yang ),김한나 ( Hanna Kim ) 한국패션비즈니스학회 2017 패션 비즈니스 Vol.21 No.2
This study examines the effects of body image and the hedonic shopping orientation of female consumers on using fashion information to purchase skinny jeans. For this purpose, an online survey was carried out during the recent year targeting female consumers who had purchased skinny jeans. A total of 464 responses were analyzed in this study. The SPSS 22.0 program was used to perform frequency analysis, factor analysis, reliability analysis, and multiple regression analysis. The results are as follows. First, interest in appearance and apparel had a significant influence on every factor of the hedonic shopping orientation, except for the relational shopping orientation, and interest in body weight had a significant effect on the enjoying, relational, and impulsive shopping orientations. Additionally, body satisfaction, except for the impulsive shopping orientation, had a significant influence on the enjoying, brand, loyalty, and relational shopping orientations; body dissatisfaction affected the brand, loyalty, relational, and impulsive shopping orientations. Second, the enjoying shopping orientation significantly influenced every factor of fashion information, and the brand shopping orientation had a positive effect on mass media information, but a negative effect on street information. Furthermore, the loyalty shopping orientation had a significant influence only on store information, the relational shopping orientation had a significant effect on both mass media and verbal information, and the impulsive shopping orientation did not exert any influence on any factors of fashion information.