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- 저자 : Bui Hoang Bac (검색결과 3 건)
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Huong, Truong Thu,Bac, Ta Phuong,Thang, Bui Doan,Long, Dao Minh,Quang, Le Anh,Dan, Nguyen Minh,Hoang, Nguyen Viet International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.6
Since machine learning was invented, there have been many different machine learning-based algorithms, from shallow learning to deep learning models, that provide solutions to the classification tasks. But then it poses a problem in choosing a suitable classification algorithm that can improve the classification/detection efficiency for a certain network context. With that comes whether an algorithm provides good performance, why it works in some problems and not in others. In this paper, we present a data-centric analysis to provide a way for selecting a suitable classification algorithm. This data-centric approach is a new viewpoint in exploring relationships between classification performance and facts and figures of data sets.
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Nguyen Thi Thanh Thao,Bui Hoang Bac 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.3
This study aimed to investigate the characteristics of three types of natural materials (KLC, KPT, and SSB) obtained fromregular deposits in Vietnam and their mullitization at calcinated temperatures of 1000 °C, 1200 °C, and 1400 °C. The sampleswere characterized by X-ray diffraction (XRD), X-ray fluorescence analysis (XRF), thermal analysis (the thermogravimetry/differential scanning calorimetry (TG/DSC)), and scanning electron microscope with energy-dispersive X-ray spectroscopy(SEM-EDS). The results indicated that kaolinite, halloysite, and sericite are the dominant minerals in the KLC, KPT, and SSBsamples, with particle sizes under 2 μm. These minerals' morphology was typical, with pseudo-hexagonal and stratifiedkaolinite, tubular halloysite, and thin platy sericite. The samples' chemical compositions are mainly SiO2 and Al2O3, followedby (K2O+Na2O), TiO2, and total iron content. Thermal analysis shows that the metakaolin phase is formed at differenttemperatures for the halloysite and kaolinite samples, as indicated by endothermic peaks at 411 °C for KPT and 436 °C forKLC. The quartz phase transition is also detected at different temperatures for the samples, with low-to-high temperatureendothermic peaks at 559 °C (KPT), 569 °C (KLC), and 575 °C (SSB). The mullitization process is observed to start attemperatures above 1000 °C and is critical at around 1400 °C, with well-crystal mullites appearing. The mineral compositionand morphology of the starting materials influence the size of the mullite crystals. SSB has larger mullite crystals than KLCand KPT at a sintering temperature of 1400 °C. It suggests that mineral composition, mineral morphology, and particle sizeof starting materials can also be essential factors influencing to mullitization process and ceramic products.
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Aluminogermanate Precursor의 자기조합(Self-assembly)을 통한 단일 벽을 갖는 나노-볼형 및 나노-튜브형 광물 유도
송윤구,이영부,Song, Yun-Goo,Bac, Bui Hoang,Lee, Young-Boo 대한자원환경지질학회 2009 자원환경지질 Vol.42 No.5
본 연구에서는 단일 벽(Single-wall) 구조를 갖는 나노크기의 속이 빈(hollow) 볼(Ball)형(NBs; Nano-balls), 짧은 길이 튜브(S-NTs; Short-fiber Nano-tubes)형 및 긴 길이 튜브(L-NTs; Long-fiber Nano-tubes) 물질을 동일한 조성 Al/Ge=1.33을 갖는 Aluminogermanate(ALGE) Precursor 최초 혼합용액의 단순한 pH 조절 과정에서 자기조합(Self-assembly)을 통해 성공적으로 합성하였다. 먼저 pH=13으로의 염기성화(Na/Al=28~30) 및 최종 pH=9 조건에서 5 nm의 균질한 크기를 갖으며, 화학조성인 Al/Ge=1.5~1.6인 속이 빈 구조의 NBs가 합성되었다. pH=13으로의 염기성화 및 최종 pH=4 조건에서는 3.3 nm 지름, 길이 15~20 nm, Al/Ge=2.6~2.8의 S-NTs가 합성되었다. 그러나 pH=9로 염기성화(Na/Al=3.8) 시킨 후 최종 pH=4조건에서는 나노-튜브의 길이가 100 nm 이상인 L-NTs가 처음으로 합성되었다. 이러한 결과는 ALGE Precursor로부터 -Ge-OH 표면에서의 $H^+$-dissociation 정도 차이, 즉, $Na^+$ 양 및 최종 pH 조건을 달리함으로써 의도하는 형태의 ALGE 나노물질 유도가 가능함을 시사한다. Ordered single-walled hollow aluminogermanate (ALGE) nano-balls(NBs) and nano-tubes(NTs) have been self-assembled from the ALGE precursors having an Al/Ge ratio of 1.33 using simple pH-control. The hollow ALGE NBs with average monodisperse diameters of 5 nm and chemistry of Al/Ge=1.5~1.6 were formed through structural assembly in the ALGE solution (Al/Ge=1.33) highly basified to pH=13(Na/Al=28~30) and followed by immediate acidification to pH=9. When the basified solution(pH=13) were acidified to pH=4, ALGE S-NTs (Short-fiber nano-tubes) with diameters of 3.3 nm, 15~20 nm in length, and chemistry of Al/Ge=2.6~2.8 were successfully synthesized. Whereas the solution was basified to pH=9, and subsequently acidified to pH=4, L-NTs(Long-fiber nano-tubes) with >100 nm in length were synthesized for the first time. The self-assembly of the hollow NBs, S-NTs, and L-NTs form the ALGE precursors can be explained by the degree of $H^+$-dissociation of the -Ge-OH inner surfaces, which was controlled by amount of $Na^+$ and pH conditions of ALGE precursor solutions. This results indicate that target forms of ALGE nanomaterials can be synthesized by simple pH controls.
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