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김영모(Kim Yeong Mo),김건우(Kim Geon U),이정우(Lee Jung Woo) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
일반적으로 인공지능 학습 및 추론에 대한 연구는 GPU 등 범용 하드웨어에서 이루어지나, 실제 제품화된 임베디드 시스템에 인공신경망을 탑재할 경우 성능에 있어 큰 차이가 발생한다. 본 논문에서는 이러한 간극을 메우기 위한 방법으로 레이어 교체 및 kernel fusion등의 기술을 소개한다.
Knowledge Distillation을 통한 EfficientNet 최적화
정만수(Jung Man Soo),김건우(Kim Geon U),이정우(Lee Jung Woo) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
본 논문은 EfficientNet에 대해 Knowledge Distillation기법을 적용하여, ImageNet-1k 데이터셋에 대하여 정확도를 크게 해치지 않는 선(81.3%에서 78.4%)에서 모델의 Inference Time을 향상시켰다.(11분11초에서 9분 30초) 또한, EfficientNet의 각 Layer에 대해 Distillation을 적용한 결과, 모델의 뒷단으로 갈수록 Knowledge Distillation에서 발생하는 성능 하락이 커지고 모델 최적화 효과가 미미해지는 것을 확인하였다. 추가로, Knowledge Distillation을 통한 모델 최적화는 Down-sampling Layer에 대해 좋은 효과를 기대하기 어렵다는 특성을 확인하였다. 본 저자는 본 논문에서 얻은 결과를 토대로, Fine-tuning을 도입하여 추가적인 실험을 시행할 예정이다.
폐유리 색상별 잔골재를 치환한 모르타르의 강도에 관한 연구
조수연 ( Jo¸ Su Yeon ),김건우 ( Kim¸ Geon U ),신종현 ( Shin¸ Joung Hyeon ),정의인 ( Jung¸ Ui In ),김봉주 ( Kim¸ Bong Joo ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
Since natural sand is being depleted, research is being conducted to use glass similar to sand as an aggregate. When non-reusable waste glass is crushed and used as fine aggregate, it is known that alkali of cement and silica of glass react to cause an alkali aggregate reaction. The purpose of this study is to provide basic data by studying the strength according to color to use waste glass as fine aggregate. When 10% was replaced, both flexural and compressive strength showed strength values similar to those of Plain. When replaced by 20% and 30%, the 7-day intensity was higher than that of Plain. In addition, colorless glass was found to have the highest strength among glass colors. More research is expected to be needed to become a fine aggregate of waste glass.
손창현,구상모,김창수,김건우,Son, Chang-Hyeon,Gu, Sang-Mo,Kim, Chang-Su,Kim, Geon-U 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.5
This paper presents a new winding method in electronic descaling (ED) technology. Conventional ED technology Produces an oscillating electric field via Faraday's law to provide the necessary molecular agitation to dissolve mineral ions. However, the proposed method produces an additional agitation force for mineral ions, called Lorentz's force. Experiments were performed using various Renolds numbers. A series of tests was conducted to measure the pressure drop across the test section and the overall heat transfer coefficient as a function of time. In order to accelerate the rate of fouling, artificial hard water, 1000ppm CaCO$_3$, was used throughout the tests. The results show that the new winding method accelerates the collision of the mineral ions, thereby improving the system efficiency. The present study can develope more effective fouling-removing equipment with change of estabishment method of coil.
한민영(Min Young Han),문현기(Hyun Ki Moon),김건우(Geon U Kim) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
This paper describes the development of a low temperature regenerative desiccant rotor for the district cooling using the SDP(Super Desiccant Polymer). The moisture sorption capacity of the super desiccant polymer is 4 to 5 times larger than those of common desiccant materials such as silica gel or zeolite. The super desiccant polymer is usually produced as granules, and so it is laminated by placing it between two thin papers and pressing them to join into the sheet material. Then the sheet material is corrugated, cut and winded itself round the tube to produce the desiccant rotor with the size of 600×120(diameter×length, mm). The desiccant rotor cassette consists of 1 desiccant rotor contained electrolytic galvanized iron sheet with welded rims, geared motor and timing belt. The dehumidification performance was tested in a climate chamber. The relevant tests were carried out at the process air inlet temperature of 32℃, the regeneration air inlet temperature of 60℃ and the inlet dew-point temperature of both the process air and the regeneration air of 18.5℃. The performance is compared with one of very common commercial desiccant rotor. It is shown that the performance is superior to that of the commercial product. Currently the durability test is going on.