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( Yue Qi ),( Yu-Xiang Huang ),( Hong-Xia Ma ),( Wen-Ji Yu ),( Nam-Hun Kim ),( Ya-Hui Zhang ) 한국목재공학회 2019 목재공학 Vol.47 No.3
Effects of a novel mold inhibitor specifically for bamboo, on the properties of composite products have been confirmed in this study. The mechanical and dimensional stability properties of bamboo fiber-based composites (BFBCs) from different bamboo species were also investigated. The results showed that Burmanica Gamble possessed the highest values of modulus of elasticity (MOE) of 33.2 GPa, modulus of rupture (MOR) of 286.9 MPa, compressive strength of 182.6 MPa and shear strength of 24.0 MPa. By contrast, Phyllostochys heterocycla among all of species showed the lowest MOE of 16.3 GPa, MOR of 170.3 MPa and compressive strength of 128.9 MPa were the lowest among all of species. Moreover, there is a remarkable variation in the swelling and water absorption between the samples with 4 h and 28 h water immersion treatment, especially Phyllostachys iridenscens. Overall, the results suggested that TCIT (Tebuconazole and 3(2H)-isothiazolone) had no significant effect on the mechanical properties compared with the control condition, and it would be utilized as an antimould of BFBCs manufacturing.
Solid Bioenergy Properties of Paulownia tomentosa Grown in Korea
Yue Qi,Chunmei Yang,Wahyu Hidayat,Jae Hyuk Jang,Nam Hun Kim 한국목재공학회 2016 목재공학 Vol.44 No.6
Paulownia tomentosa is one of fast-growing wood species in Korea. In order to evaluate the solid bioenergy properties of Paulownia tree, this study examined the heating value, moisture content (MC), pH and proximate analysis of stem, branch, root, bark and leaf. The heating values of wood parts were slightly higher than those of bark and leaf, and that of branch was the highest among all the samples. The higher moisture content of bark and leaf referred to their lower heating value. Also, the pH of stem, branch and root was similar and lower than those of bark and leaf. The ash content of bark and leaf was much higher than that of wood parts, which is the one of the reasons for effect on the lower heating value and higher pH. While, the volatile matter content (VMC) of bark and leaf was lower than those of wood parts. The bark showed the highest fixed carbon content (FCC), while the FCC of stem was the lowest among all the samples. The obtained results are encouraging that the Paulownia tree could be totally utilized as alternative fuels for bioenergy production.
Anatomical Characteristics of Paulownia tomentosa Root Wood
Yue Qi,Jaehyuk Jang,Wahyu Hidayat,Aehee Lee,Sehwi Park,Seunghwan Lee,Namhun Kim 한국목재공학회 2016 목재공학 Vol.44 No.2
This study investigated several anatomical characteristics of Paulownia tomentosa roots. The root wood wasseparated into three parts from stem base (top, middle, and base) at different positions below ground. Qualitative anatomical data suggested that the growth rings in earlywood and latewood were structurally different. Furthermore, the root wood vessels were found having 2 to 3 radial multiples and they were appeared in theform of clusters. In addition, some sheath cells and septate axial parenchyma were observed. Regarding the quantitative anatomical characteristics, vessel and ray numbers per mm2, as well as ray width and height differed significantly among the top, middle, and base rood wood parts. However, there were no significant differences in vessel diameters, cell wall thickness, and width and length of wood fibers among those parts. The crystallinity of the root top part was slightly higher than that of the middle and base parts. Furthermore, the vessel numbers, ray numbers, and ray width and height in the near pith (NP) area were higher compared to those in the near bark (NB) area. However, the fiber width and fiber length at NP were lower than those at NB. Overall, this study demonstrated some significant differences in the anatomical characteristics of the top, middle, and base parts of root wood from Paulownia tomentosa.
The Single-Cell Revelation of Thermogenic Adipose Tissue
Yue Qi,Xiaoyan Hannah Hui 한국분자세포생물학회 2022 Molecules and cells Vol.45 No.10
The past two decades have witnessed an upsurge in the appreciation of adipose tissue (AT) as an immuno-metabolic hub harbouring heterogeneous cell populations that collectively fine-tune systemic metabolic homeostasis. Technological advancements, especially single-cell transcriptomics, have offered an unprecedented opportunity for dissecting the sophisticated cellular networks and compositional dynamics underpinning AT remodelling. The “re-discovery” of functional brown adipose tissue dissipating heat energy in human adults has aroused tremendous interest in exploiting the mechanisms underpinning the engagement of AT thermogenesis for combating human obesity. In this review, we aim to summarise and evaluate the use of single-cell transcriptomics that contribute to a better appreciation of the cellular plasticity and intercellular crosstalk in thermogenic AT.
( Yue Qi ),전우석,장재혁,김남훈 韓國木材工學會 2016 한국목재공학회 학술발표논문집 Vol.2016 No.2
국내 목재시장은 83% 이상을 수입재에 의존하고 있다. 2050년까지 국산재 점유율 50%를 목표로 하고 있는 우리나라로서는 유용수종 및 속성수의 개발이 중요하다. 특히, 국내산 참오동나무는 다른 수종들에 비해 생장속도가 약 3배 이상 빠른 속성수이며, 비중이 0.30 정도로 매우 작기 때문에 원료의 확보 및 미세섬유화가 우수할 것으로 생각되는 유망 자원이라 할 수 있다. 따라서 본 연구에서는 국내에 자생하고 있는 참오동나무의 해부 및 마세섬유화 특성을 평가하기 위해 수간, 가지, 뿌리의 각 부위별로 비교·분석하였다. 그 결과, 수간과 가지재에서는 뚜렷한 생장륜과 함께 고립관공이 관찰되었지만, 뿌리재에서는 비교적 뚜렷하지 않은 생장륜과 함께 고립관공과 방사복합관공이 관찰되었다. 도관의 개수와 직경 그리고 방사조직의 개수, 폭, 높이는 뚜렷한 차이를 보였지만, 섬유 길이는 유사한 값을 보였다. 미세섬유화 과정에서 연속식 분쇄 중 동일 중량을 분쇄하였음에도 가지재 수간 및 뿌리재에 비하여 비교적 빠른 속도로 미세섬유가 제조 되었다. 섬유의 미세화 정도를 간접적으로 평가할 수 있는 여수도 측정결과, 가지재가 다른 두 부위에 비해 여수시간이 길었다. SEM 관찰 결과 세 부위 모두 큰 차이는 보이지 않았으나, 가지재에서 섬유간 재응집 현상이 관찰되는 빈도가 상대적으로 적었다.
Two-sided Matching Decision with Two-granularity Uncertain and Incomplete Linguistic Terms
Yue Qi 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.2
With respect to the two-sided matching problem, where the agents’ preferences are in the format of two-granularity uncertain and incomplete linguistic terms, a matching method is presented. Some definitions on uncertain linguistic term and 2-tuple are firstly given. The two-sided matching problem with two-granularity uncertain and incomplete linguistic terms is described. Then, uncertain and incomplete linguistic term matrixes are transformed into 2-tuple matrixes. Furthermore, a multi-objective optimization model is developed by using the extended 2-tuple weighted average. By using the 2-tuple arithmetic mean, the normalization method and the linear weighted method, the multi-objective optimization model can be converted into a single-objective optimization model. By solving the optimization model, the matching alternative can be obtained. A matching example illustrates the feasibility and effectiveness of this method.
Modeling and Emulation of 3d Dither Stability in Orthogonal Turn-Milling
Yueqi Guan,Hanqing Guan,Gaoshen Wang,Rongling Chen 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.6
Aiming at 4-axial orthogonal turn-milling by end mill, its theoretical 3d model for stable range of dither was put forward on the basis of its cutting principle by using analytical method. Based on modal trial, the stable range leaf figure of end mill’s dither in 4-axial turn-milling with eccentricity was simulated and analyzed. The results show that besides geometrical shape of mill, material of workpiece and frequency response function of machine-tool’s structure etc that can produce dither in 4-axial turn-milling, the rotating speed of mill and cutting depth are also related to dither. In trial of 4-axial turn-milling by end mill, the results of cutting force spectrum analysis show that: cutting is stable and un-dither when frequency of cutter tooth cutting-in plays leading role in force spectrum. Dither is produced when modal frequency of system plays leading role in force spectrum, the measured value of cutting force and surface roughness are also higher than those in the condition of un-dither. Thus the theoretical model and results of emulation can predict stability of end mill’s dither in 4-axial orthogonal turn-milling with eccentricity correctly and can provide theoretical guidance for surface quality and processing efficiency of workpiece.