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함현식(Hyun-sik Ham),김동현(Dong-hyun Kim),채정우(Jung-woo Chae),이신애(Sin-ae Lee),김윤지(Yun-ji Kim),조현욱(Hyun Uk Cho),조현종(Hyun-chong Cho) 대한전기학회 2020 전기학회논문지 Vol.69 No.2
The early detection of plant disease is important in that it enhances the quality and productivity of crops. A large amount of research has considered machine learning classifiers to protect tomato plants from diseases, but the reliability of early disease diagnoses in this way remains uncertain due to the use of small datasets. Therefore, to enhance the dependability of them, this study examined a tomato disease classification system based on a deep learning using a dataset containing 17,063 images of tomato leaves infected with eight diseases. The deep learning model used in this classifier consisted of symmetric and asymmetric building blocks including convolutions, average pooling, max pooling, concats, dropouts, and fully connected layers. The obtained result indicated a high degree of accuracy (98.9%) which is high enough to be used as a proper diagnosis tool for farmers who lack professional knowledge of tomato diseases.
이애리 ( Lee Ae Li ),김성래 ( Kim Seong Lae ),함현식 ( Ham Hyeon Sig ),박홍수 ( Park Hong Su ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.4
N/A Organic acid salt of fatty polyamide (DDDT) and acrylate of fatty carbamide (DDTCA) were synthesized as a main component for the softener. O/W type non-ionic softener (NSC) was prepared by blending DDDT and DDTCA with beef tallow, lanolin anhydride, polyoxyethylene(7) stearyl ether, and polyoxyethylene(50) oleyl ether. After treatment of NSC to all cotton fabrics, the physical properties such as tear strength, crease recovery, and flexing abrasion resistance were measured. As a result of the measurement, NSC was proved to be durable non-ionic softener with good softness.
인 함유 벤조산 변성폴리에스테르와 HDI-Trimer에 의한 PU 난연도료의 제조 및 도막물성
이애리 ( Lee Ae Li ),유혁재 ( Yu Hyeog Jae ),정동진 ( Jeong Dong Jin ),함현식 ( Ham Hyeon Sig ),박홍수 ( Park Hong Su ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.1
N/A PU flame-retardant coatings (APHD) containing phosphorous were prepared by blending of hexamethylene diisocyanate-trimer, white pihment, dispersing agent, flowing agent , and previously prepared benzoic acid modified polyester (APTB) that contains phosphorous. Physical properties of the prepared APHD were examined. With the introduction of BZA (contained in APTB) the film viscosity and film hardness of APHD decreased. With the introduction of caprolactone group, the flexibility, impact resistance, accelerated weathering resistance of APTBs increased. Flame retardancy of the coatings was tested. In a vertical burning method, APHD shows 210~313 seconds, and in a 45?Meckel burner method, shows 1.3~4.0㎠ of char length, which indicates that the coatings are good flame-retardant coatings. Moreover, the amount of afterglow and flame retardancy of the coatings are decreased with increasing BZA content.
4성분계 복합 산화물 촉매 이용 메탄의 부분산화에 의한 메탄올 직접 합성
김영국,이광혁,함현식,Kim, Young-Kook,Lee, Kwang-Hyeok,Hahm, Hyun-Sik 한국응용과학기술학회 2014 한국응용과학기술학회지 Vol.31 No.3
Methanol was directly produced by the partial oxidation of methane with four-component mixed oxide catalysts. Four-component(Mo-Bi-Cr-Si) mixed oxide catalysts were prepared by the co-precipitation and sol-gel methods. The catalyst prepared by the sol-gel method showed about eleven times higher surface area than that prepared by the co-precipitation method. From the $O_2$-TPD experiment of the prepared catalysts, it was proven that there exists two types of oxygen species, and the oxygen species that participates in the partial oxidation reaction is the lattice oxygen desorbing around $750^{\circ}C$. The optimum reaction condition for methanol production was $420^{\circ}C$, 50 bar, flow rate of 115 mL/min, and $CH_4/O_2$ ratio of 10/1.5, providing methane conversion and methanol selectivity of 3.2 and 26.7%, respectively.
김영국 ( Young Kook Kim ),이광혁 ( Kwang Hyeok Lee ),함현식 ( Hyun Sik Hahm ) 한국유화학회 2013 한국응용과학기술학회지 Vol.30 No.4
페롭스카이트 촉매와 Mo, Bi를 기본으로 하는 복합 산화물 촉매를 이용하여 천연가스의 주성분인 메탄의 부분산화를 통하여 메탄올을 직접 합성하였다. 페롭스카이트(ABO3) 촉매는 A 및 B site 성분을 변화시키면서 사과산법으로 제조하였으며, Mo, Bi를 기본으로 하는 3성분계 복합 산화물 촉매는 공침법으로 제조하여 반응특성을 살펴보았다. 페롭스카이트 촉매에서 A site에 알칼리 금속인 Sr을, B site에 전이금속인 Cr을 도입한 SrCrO3 촉매가 400℃에서 메탄올 선택도 11%로 가장 우수한 결과를 보였다. Mo, Bi를 기본으로 하는 3성분계 복합 산화물 촉매의 경우 모든 촉매에서 메탄 전환율에는 큰 차이를 보이지 않았으며, Cr을 첨가한 Mo-Bi-Cr 복합 산화물 촉매가 400℃에서 메탄올 선택도 15.3%로 가장 우수한 결과를 나타냈다. 3성분계 복합 산화물 촉매에서 촉매의 활성과 메탄올 선택도는 촉매의 표면적에 정비례하였다. Methanol was directly produced by the partial oxidation of methane with perovskite and mixed oxide catalysts. Perovskite (ABO3) catalysts were prepared by the malic acid method with changing A and B site components. Three-component mixed oxide catalysts that have Mo and Bi as a main component were prepared by the co-precipitation method. Among the perovskite catalysts, SrCrO3 showed the highest methanol selectivity of 11% at 400℃. For the three-component mixed oxide catalysts, there were no remarkable changes in methane conversion. Among the mixed oxide catalysts, Mo-Bi-Cr mixed oxide catalyst showed the highest methanol selectivity of 15.3% at 400℃. The catalytic activity and methanol selectivity of the three-component mixed oxide catalysts were directly proportional to the surface area of the catalysts.