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MultiSAGE 모델과 ESG 지표를 적용한 상품 추천 시스템 개발
김현우 ( Hyeon-woo Kim ),김용준 ( Yong-jun Kim ),유길상 ( Gil-sang Yoo ) 한국인터넷정보학회 2024 인터넷정보학회논문지 Vol.25 No.1
최근 소비자들은 환경, 사회, 지배구조 관련 정보를 확인하고 더 나은 사회적 가치와 환경 친화적인 제품을 선택하려는 경향이 증가되고 있다. 본 논문에서는 GraphSAGE와 GAT를 결합한 모델인 MultiSAGE를 활용하여 최근 소비 트렌드인 가치소비에 맞추어 ESG 지표를 적용한 상품 추천 시스템을 제안하였다. 이를 위하여 한국 ESG 기준원에서 수집한 2022년 1,033개 기업의 ESG 등급 데이터와 실제 N기업의 쇼핑의 상품 데이터를 Heterogeneous Graph 형식의 데이터로 바꾸는 데이터 처리 과정과 MultiSAGE를 적용하여 머신러닝에 적용하고, 특정 상품을 입력하면 그 상품의 친환경 대체재를 추천해주는 추천 시스템을 구현하였다. 구현결과, 소비자들은 기업의 ESG지표를 적용한 제품을 쉽게 비교하여 구매할 수 있고, 이를 통해 사회적 가치와 환경친화적인 제품을 추천하는 시스템에 활용될 것으로 기대한다. Recently, consumers have shown an increasing tendency to seek information related to environmental, social, and governance (ESG) aspects in order to choose products with higher social value and environmental friendliness. In this paper, we proposes a product recommendation system applying ESG indicators tailored to the recent consumer trend of value-based consumption, utilizing a model called MultiSAGE that combines GraphSAGE and GAT. To achieve this, ESG rating data for 1,033 companies in 2022 collected from the Korea ESG Standard Institute and actual product data from N companies were transformed into a Heterogeneous Graph format through a data processing pipeline. The MultiSAGE model was then applied in machine learning to implement a recommendation system that, given a specific product, suggests eco-friendly alternatives. The implementation results indicate that consumers can easily compare and purchase products with ESG indicators applied, and it is anticipated that this system will be utilized in recommending products with social value and environmental friendliness.
김현우(Hyeon Woo Kim),이유식(You-sik Lee),남유진(Yujin Nam) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.2
In case of a fire in a large volume space, the localization of smoke through a smoke control system is essential. However, in korea, the installation standard of the smoke reservoir screen in large volume space is insufficient. Therefore, this study was conducted in order to analyze smoke control effect in large volume space. The three numerical analyzation is conducted smoke diffusion time according to depth of screen, smoke diffusion time in the change of distance from fire source, smoke diffusion time in the change of height with a fire simulation, FDS. As the result, depth of the screen became deeper, the absolute value of the smoke control effect increased, but the increase in the delay effect of smoke delayed gradually compared to the increase in depth.
과학 : 가속되는 파원으로부터 발진하는 음파의 도플러 효과
김현우 ( Hyeon Woo Kim ),허예훈 ( Ye Hoon Heo ),한상욱 ( Sang Wook Han ) 전북대학교 과학교육연구소 2014 과학과 과학교육 논문지 Vol.39 No.2
움직이는 물체가 발진하는 파동은 관측자와의 상대적인 운동에 따라서 원래 파동의 떨기수보다 크거나 작게 느끼는 것을 도플러 효과라고 한다. 등속도 운동하는 파원으로부터 관측된 파의 떨기수 변화는 도플러효과 이론값과 정확히 일치한다. 가속되는 파원으로부터 발진되는 파동의 도플러효과도 등속도 운동하는 도플러효과 이론식을 이용하여 정확히 예측할 수 있다. 가속되는 파원으로부터 발진하는 음파의 떨기수는 다양한 속력의 파원이 발진한 음파의 떨기수의 합으로 나타났다. The Doppler effect describes an observed frequency change depending on a relative movement between a source and an observer. Observed frequencies of sounds generated from a source with a constant speed can be precisely estimated by using the Doppler effect theory. We measured frequency changes from an accelerated source and compared them with theoretical calculations using the Doppler effect theory. From the measurements, we found that observed frequencies were the summation of total frequencies emitted from a sound source at different speeds.
5알파 환원효소억제제 복용 후 혈중 전립선특이항원의 변화
김현우(Hyeon Woo Kim),하홍구(Hong Koo Ha) 대한비뇨기종양학회 2012 대한비뇨기종양학회지 Vol.10 No.2
The aim of this review is to provide a discussion of serum prostate specific antigen (PSA) after use of 5α-reductase inhibitors (5αRIs). The 5αRIs that are used to treat benign prostatic hyperplasia may reduce operation risks and acute urinary retention. However, it causes alteration of serum PSA level requiring clinician’s attention. After two large studies, Prostate Cancer Prevention Trial (PCPT) and Reduction by Dutasteride of Prostate Cancer Events (REDUCE) study, many literatures has showed that 5αRI reduces the prevalence of prostate cancer, especially in low grade cancer. However, the incidence of high grade prostate cancer increased in 5αRI group than placebo group. Recently, some authors revealed that serum PSA sensitivity to prostate cancer increased in the 5αRIs arm than placebo using serum PSA doubling rule, serum PSA density and increasing serum PSA after nadir level. The serum PSA is usually doubled in patients with 5αRIs more than 12 months because these decrease serum PSA level down to approximately 50% at 1 year compared to baseline. It seems to be such a simple method but may yield serum PSA overestimation during first 6 months and underestimation after 4 years of the use of 5αRIs. Some authors have reported serum PSA density is useful in increasing sensitivity to prostate cancer after 1 year use of 5αRI that reduce serum PSA noising effect of benign prostatic hyperplasia. Recently, increasing serum PSA after nadir level has been seemed to be an attractive method to detect prostate cancer in patients with use of 5αRIs.
김현우(Hyeon-woo Kim),이수정(Su-jeong Lee),송영화(Yeong-wha Sawng) 한국창업학회 2016 한국창업학회 Conferences Vol.2016 No.3
This paper is based on the innovation ecosystem stake holder model by MIT Sloan. It is a model to analyze an ecosystem of startup and innovation cluster. Since 2000, global economy has been experienced digital economy and many ICT focused clusters has been emerged as Jerusalem of innovation and startup. Pangyo techno-valley is assessed as a desirable cluster of IT and related industries. Also, Techcity in London is emerging as an herb for startups and innovators in Europe, which was ranked the best city for entrepreneurs(European Digital City Index,2015). According to the innovation ecosystem stake holder model, five factors are vital to organize startup ecosystem- entrepreneur, company & firm, risk capital, government, university. We figured out Techcity is a well developed, balanced ecosystem for startup and innovation. In contrasts, Pangyo is assessed to have a weakness in university factor. This vulnerable point should be reinforced by partnership or collaborative research with p restigious universities around Seoul and Gyeonggi-do Province.