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역직구 상품 추천 및 판매가 추정을 위한 머신러닝 모델
김규익,볘르드바에브 예르갈리,김수형,김진석 한국산업경영시스템학회 2023 한국산업경영시스템학회지 Vol.46 No.2
With about 80% of the global economy expected to shift to the global market by 2030, exports of reverse direct purchase products, in which foreign consumers purchase products from online shopping malls in Korea, are growing 55% annually. As of 2021, sales of reverse direct purchases in South Korea increased 50.6% from the previous year, surpassing 40 million. In order for domestic SMEs(Small and medium sized enterprises) to enter overseas markets, it is important to come up with export strategies based on various market analysis information, but for domestic small and medium-sized sellers, entry barriers are high, such as lack of information on overseas markets and difficulty in selecting local preferred products and determining competitive sales prices. This study develops an AI-based product recommendation and sales price estimation model to collect and analyze global shopping malls and product trends to provide marketing information that presents promising and appropriate product sales prices to small and medium-sized sellers who have difficulty collecting global market information. The product recommendation model is based on the LTR (Learning To Rank) methodology. As a result of comparing performance with nDCG, the Pair-wise-based XGBoost-LambdaMART Model was measured to be excellent. The sales price estimation model uses a regression algorithm. According to the R-Squared value, the Light Gradient Boosting Machine performs best in this model.
유사동적실험에 의한 수직거동 마찰댐퍼로 보강된 2층 골조의 내진성능평가
김규익 ( Kim Kyu-ik ),정주성 ( Jung Ju-seong ),송성빈 ( Song Sung-bin ),이강석 ( Lee Kang Seok ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
수직거동 마찰댐퍼 시스템의 내진보강공법의 유효성을 판단하기 위해 제진장치의 반복가력실험과 1980년대 비내진 상세를 가지는 R/C건축물을 대상으로 하는 실물 2층 골조를 제작하여 유사동적실험을 실시하였다. 실험결과 수직거동 마찰댐퍼 시스템으로 보강된 실험체는 동일 가속도(200 gal)에서 기준 실험체 대비 최대하중은 약 1.6배 증가하였고, 응답변위는 0.4배로 저감되어 본 연구에서 개발된 수직거동 마찰댐퍼 내진보강공법의 유효성이 검증되었다.
김규익(Kyu Ik Kim),김성호(Cheng Hao Jin),이양구(Yang Koo Lee),김상엽(Sang Yeob Kim),김광득(Kwang Deuk Kim),류근호(Keun Ho Ryu) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
With the world began to industrialized and the population grew, people used lots of fossil fuels like oil, coal and natural gas. Electrical power plants which depend on fossil fuels throw tons of pollutants, and ashes into the air. Therefore, it causes serious environment pollutions and exhaustion of fossil fuels in the near future. Due to this situation, people feel that we need alternative energy for the fossil fuels. The new and renewable energy is appointed as the alternative energy for fossil fuels. In order to use it efficiently, we need enough analyzation about the renewable energy data. Renewable energy data is collected from USN (Ubiquitous Sensor Network) and it is a kind of stream data. The stream data has a characteristic of fast, continuous, and infinite. Therefore, it is not fit to process using data processing of traditional DBMS (DataBase Management System). In this study, we use DSMS (Data Stream Management System) as alternative approach for processing the stream data of renewable energy data.
한인규 ( I K Han ),김규익 ( K I Kim ),오세정 ( S J Oh ) 한국축산학회 1970 한국축산학회지 Vol.12 No.4
A series of analytical work was carried out to compare the chemical composition including the content of calcium and phosphorus of bone meal, marine shell flour, kelp meal and some other commercially prepared mineral feedstuffs in Korea. The results obtained are summarized as follows: 1. The content of moisture, crude protein, crude fiber, crude ash, calcium and phosphorus in bone meal was significantly different between the products collected. The content of Ca and P in the bone meal analyzed was much lower than those figures we used in the past foreign data from mainly USA and Japan. Therefore, more attention should be given for selecting bone meal to improve the content of Ca and P in the ration. 2. Marine shell flours contained different moisture and crude fiber content. Although most of marine shell flours analyzed contained relatively high content of calcium (31%), some of them contained very low amount of Ca in it (13%). Generally, the content of Ca in good quality marine shell flour of white color was higher than that in poor quality marine shell flour of dark color. 3. Kelp meal from different variety showed significant difference(p$lt;0.01) in moisture, crude protein and crude fiber content, but no difference was observed in crude fat, crude ash and P content between the products. 4. It was indicated that limestone and commercially prepared mineral feeds such as dicalcium phosphate, tricalcium phosphate, Rincal and rock phosphate were good source of Ca and P with small variation in chemical composition between products.