SENSITIVITY ANALYSIS FOR A CLASS OF IMPLICIT MULTIFUNCTIONS WITH APPLICATIONS

Li, Shengjie,Li, Minghua Korean Mathematical Society 2012 대한수학회보 Vol.49 No.2

In this paper, under some suitable conditions and in virtue of a selection which depends on a vector-valued function and a feasible set map, the sensitivity analysis of a class of implicit multifunctions is investigated. Moreover, by using the results established, the solution sets of parametric vector optimization problems are studied.

SENSITIVITY ANALYSIS FOR A CLASS OF IMPLICIT MULTIFUNCTIONS WITH APPLICATIONS

Shengjie Li,Minghua Li 대한수학회 2012 대한수학회보 Vol.49 No.2

In this paper, under some suitable conditions and in virtue of a selection which depends on a vector-valued function and a feasible set map, the sensitivity analysis of a class of implicit multifunctions is investigated. Moreover, by using the results established, the solution sets of parametric vector optimization problems are studied. In this paper, under some suitable conditions and in virtue of a selection which depends on a vector-valued function and a feasible set map, the sensitivity analysis of a class of implicit multifunctions is investigated. Moreover, by using the results established, the solution sets of parametric vector optimization problems are studied.

An I-Shaped Slot Grid Antenna Array with Substrate Integration and Enhanced Bandwidth

Zhiyi Li,Shengjie Wang,Fan Li,Lin Lin,Hongzheng Zeng 한국전자파학회JEES 2023 Journal of Electromagnetic Engineering and Science Vol.23 No.5

miR-101-3p/Rap1b signal pathway plays a key role in osteoclast differentiation after treatment with bisphosphonates

( Jie Li ),( You Li ),( Shengjie Wang ),( Hui Che ),( Jun Wu ),( Yongxin Ren ) 생화학분자생물학회(구 한국생화학분자생물학회) 2019 BMB Reports Vol.52 No.9

Bisphosphonates are the mainstay of therapy worldwide for osteoporosis. However, bisphosphonates also have limitations. The objective of this study was to determine the role of miR-101-3p/Rap1b signal pathway in osteoclast differentiation after treatment with bisphosphonates. Our results revealed that miR-101-3p was an important regulator in bisphosphonates treated-osteoclasts. When miR-101-3p was down-regulated in bone marrow-derived macrophage-like cells (BMMs), the development of mature osteoclasts was promoted, and vice versa. However, alendronate decreased multinucleated cell number regardless of whether miR-101-3p was knocked down or over-expressed. TRAP activity assay confirmed the above results. Luciferase assay indicated that miR-101-3p was a negative regulator of Rap1b. Western blot analysis revealed that protein expression level of Rap1b in BMMs transfected with OV-miR-101-3p was lower than that in BMMs transfected with an empty vector. Rap1b overexpression increased TRAP-positive multinucleated cells, while Rap1b inhibition decreased the cell numbers. In vivo data showed that miR-101-3p inhibited osteoclast differentiation in ovariectomized mice while overexpressed of Rap1b blocked the differentiation. Taken together, our data demonstrate that miR-101-3p/Rap1b signal pathway plays a key role in osteoclast differentiation after treatment with bisphosphonates. [BMB Reports 2019; 52(9): 572-576]

Experimental Research on Anti-freezing and Thawing Performance of Basalt Fiber Reinforced Fly Ash Concrete in the Corrosive Conditions

Shengji Jin,Yu-hao Yang,Yi-min Sun,Li-Xu,Jing-yan Xu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8

Basalt fiber reinforced fly ash concrete (BFRFAC) is a new inorganic nonmetal compositeconstruction material with excellent mechanical properties that could be widely used forbridge floors, pavements, and other construction engineering projects. The anti-freezing andthawing performance of BFRFAC in the corrosion circumstances was studied in detail with acomparison to normal concrete (NC) by using quick freezing method in this work. In thecontrol group, the mass loss rate (MLR) and relative dynamic modulus of elasticity (RDME) onBFRFAC were determined in non-corrosion environment. In the control group, the mass lossrate (MLR) and relative dynamic modulus of elasticity (RDME) on BFRFAC were determined innon-corrosion environment. In the experimental group, the RDME on BFRFAC were determinedin chloride corrosion, sulfate corrosion, the complex combined corrosion of chloride andsulfate solution. Further, a scanning electron microscope (SEM) was employed to scan themeso-structure of the rupture cross-section in t-he composite material at magnifications of500, 1000, and 1500. The gripping effect between basalt fibers and su-bstrate was quantitativelyanalyzed in the case of pull-out failure and fracture failure, which convincingly reveal-ed thecrack resistance, reinforcement, and toughening mechanisms of basalt fibers on concretesubstrate. We found that RDME decreased and its descent rate slows down when BFRFACwas exposed to freeze-thaw cycles in above-mentioned four situations. The number of freezethawcycles of BFRFAC was greater than 400 in the complex case of solution corrosion. TheBFRFAC cyclic lifespan could be effectively extended in contrast to NC. Moreover, make fulluse of volcanic ash and micro-aggregate effect of fly ash can improves the gripping effectbetween basalt fibers and concrete substrate. As a result, it has the potential to significantlyimprove anti-freezing and thawing damage capacity of BFRFAC.

Investigation of the concentration characteristic of RCS during the boration process using a coupled model

Chi Xiangyu,Li Shengjie,Gu Mingzhou,Li Yaru,Zhu Xixi,Wang Naihua 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.8

The fluid retention effect of the Volume Control Tank (VCT) leads to a long time delay in Reactor Coolant System (RCS) concentration during the boration process. A coupled model combining a lumpedparameter sub-model and a computational fluid dynamics sub-model is currently used to investigate the concentration dynamic characteristic of RCS during the boration process. This model is validated by comparison with experimental data, and the predicted results show excellent agreement with experimental data. We provide detailed fields in VCT and concentration variations of RCS to study the interaction between mixing in VCT and the transient responses of RCS. Moreover, the impacts of the inlet flow rate, inlet nozzle diameter, original concentration, and replenishing temperature of VCT on the RCS concentration characteristic are studied. The inlet flow rate and nozzle diameter of VCT remarkably affect the RCS concentration characteristic. Too-large or too-small inlet flow rates and nozzle diameters will lead to unacceptable long delays. In this work, the optimal inlet flow rate and nozzle diameter of VCT are 5 m3 /h and 58.8 mm, respectively. Besides, the impacts of the original concentration and replenishing temperature of VCT are negligible under normal operating conditions.

Compressive-Tensile Mechanics and Energy Consumptions of a Cementitious Composite with High Utilization of Steel Slag

Guohua Sheng,Shengji Jin,Chao Li,Quan Bai,Xiaoyu Wang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.3

In response to the National Development and Reform Commission's “Guiding Opinions on Comprehensive Utilization of Large Solid Wastes during the Fourteenth Five Year Plan”, further expand the use of steel slag as concrete admixture in construction projects and other fields, and gradually improve the comprehensive utilization ratio, a cementitious composite with high utilization of steel slag (CHS) was developed, which is with the cement replaced by high-content super-fine steel slag powder (SSP) (replacement ratio υ ≥ 30%) as the cementitious materials, steel slag sand (SS) as the only aggregate and environmentally basalt fiber (BF) for toughening. It improves the utilization percentage of steel slag (SSP and SS) and reduces the consumption of natural resources such as cement and natural sand. Use BF to achieve better strength and toughness. In order to better understand the performance of CHS and make it better used in the engineering field. Study the influence of each component on the strength and energy consumption of compression and splitting tension, and strive to find the optimal proportion and lay the theoretical foundation for its application. Through the tests, the effects of high replacement ratio υ (30% − 50%), low binder-aggregate ratio γ (0.31 − 0.44), and BF content ρv (0% − 2%) on the aspects of peak strength, force-deformation curve and energy consumption were analyzed. The results show that the standard curing fck and ft,s can reach 40 MPa and 5 MPa respectively. With the increase of υ, the maximum axial compressive strength fck and splitting tensile strength ft,s decreased insignificantly. The γ has an important influence on fck and ft,s. When it increases from 0.31 to 0.44, fck increases linearly by 63.1% to 40.4 MPa, while ft,s increases by 52.8% to 5.18 MPa. As ρv increases, fck and ft,s show a trend of first increasing and then decreasing. ρv exerts a significant impact on the descending segments of stress-strain response curves of the compression which expressed as bilinear and trilinear models with different ρv after normalization. The energy consumptions of peak, total, and residual (Epeak, Edisp, Eres) show a slight downward trend with the increase of υ, a significantly upward trend with the increase of γ. With the increase of γv, Epeak and Edisp increase first and then tend to be flat, while Eres always increases and the percentages of Eres/Edisp in the compressive test increase from 22.6% to 38.5%, reflecting the improvement of the compressivetoughness of BF.

Minimax problems of uniformly same-order set-valued mappings

Yu Zhang,Shengjie Li 대한수학회 2013 대한수학회보 Vol.50 No.5

In this paper, a class of set-valued mappings is introduced, which is called uniformly same-order. For this sort of mappings, some minimax problems, in which the minimization and the maximization of set-valued mappings are taken in the sense of vector optimization, are investigated without any hypotheses of convexity.

MINIMAX PROBLEMS OF UNIFORMLY SAME-ORDER SET-VALUED MAPPINGS

Zhang, Yu,Li, Shengjie Korean Mathematical Society 2013 대한수학회보 Vol.50 No.5

In this paper, a class of set-valued mappings is introduced, which is called uniformly same-order. For this sort of mappings, some minimax problems, in which the minimization and the maximization of set-valued mappings are taken in the sense of vector optimization, are investigated without any hypotheses of convexity.

Analysis and Design of Seismic Robustness of FRP-Reinforced Frame based on Interlayer Displacement

Guohua Sheng,Quan Bai,Shengji Jin,He Yu,Mingfei Li 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.6

For a structure, robustness is a high-level performance index since it takes account of the effects of impact, explosion, earthquake and other instantaneous dynamic actions on the structure safety. In this work, layer is taken as the tie between the column and the frame. Two concepts, namely, “layer importance coefficient” of the column and “layer vulnerability coefficient” of the frame, are introduced. Based on these, the method for calculating the seismic robustness is proposed and analyzes the seismic robustness of three FRP-reinforced frame models. The results show that: The robustness of the frame with the 1st layer column reinforced with two layer CFRP (carbon fiber reinforced polymer) (F20RC) and the 1st and 2nd layer column reinforced with one layer CFRP (F11RC), respectively are better than that of the 1st layer column reinforced with one layer CFRP (F10RC). As the intensity of earthquake action increases, the seismic robustness index decreases. When UBC97's acceleration-related parameter Ca = 0.36 and velocityrelated parameter Cv = 0.36, the robustness coefficient of the three models F20RC, F11RC, F10RC are 36.5, 37.2, 34.1, respectively. When Ca = 0.6, Cv = 0.6, that of F20RC, F11RC, F10RC are 24.2, 20.4, 19.5, respectively. Finally, the procedure for designing the FRP-reinforced frame based on the seismic robustness is presented and demonstrated.