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Empirical likelihood for the class of single index hazard regression models
Jianbo Li,Minglong Guo,Changxin Du,Riquan Zhang,Heng Lian 한국통계학회 2015 Journal of the Korean Statistical Society Vol.44 No.4
Based on the B spline approximation technique and right censored data, we consider the empirical likelihood inference for the index parameters and its partial components in a class of single index hazard regression models. Under some regular conditions, we show that our proposed empirical likelihood ratio statistics follow the standard χ2 distribution. Some numerical studies are given to illustrate our proposed methodology.
Operational Risk Management of Commercial Banks
Jianbo Song,Xiaokun Zhao,Chunyan Sheng 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
In this paper, we present the types and characteristics of risks in commercial banks. Among all the risks, operational risk is paid more and more heed to. It is caused by people, processes, external events and other factors. According to the Base II New Capital Accord, there are mainly three approahces to the capital for dperational risk-The Basic Indicator Approach, The Standardized Approach and The Advanced Measurement Approach. We can take actions to manage the operational risk in commerical banks and improve their competitiveness: (1) create a culture of risk management; (2) establish the independent organizational structure of risk management; (3) introduce the strict division of posts; (4) design a procedure of tight authorization; (5) assume the procedural or standardized control; (6) set up the efficient program of employee management; (7) reengineer the business processes of banks; (8) highlight control over special risk points.
Jianbo Chen,Enqi Wu,Hongmei Zhu,이관준,Van Men Chu,조정원,김영호,박용기,이원재,강종성 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
High-performance liquid chromatography (HPLC) and capillary electrophoresis (CE) were used to identify five active components in the modified herbal decoction Bo-Yang-Hwan-O-Tang (mBHT), i.e., amygdalin,decursin, paeoniflorin, salvianolic acid B, and calycosin-7-O-β-D-glycoside. These components were identified by comparing their retention times and mass spectra with those of reference compounds. The conditions of both analytical methods were optimized and validated. Sufficient separation of target analytes was achieved using a buffer consisting of 40 mM sodium borate and 60 mM sodium dodecylsulfate (SDS) containing 10% methanol (pH 9.5) at 250 nm for CE analysis and gradient elution with a water-methanol mobile phase and ultraviolet (UV) photodiode array detector (DAD) at 250 nm for HPLC analysis. The mBHT components were determined within 65 min by HPLC and 16 min by CE. All calibration curves showed high linearity (R > 0.999) within the ranges tested. Intra-day and inter-day precision were less than 1.6% and 1.8% for HPLC and 2.5% and 4.8% for CE, respectively. The accuracy of the methods ranged from 98.8% to 102.3% for HPLC and from 95.9% to 108.2% for CE.
Laguerre characterization of some hypersurfaces
Jianbo Fang,Fengjiang Li 대한수학회 2016 대한수학회보 Vol.53 No.3
Let $x$ : ${M}^{n-1}\rightarrow{\mathbb R}^{n}$ $(n\geq4)$ be an umbilical free hypersurface with non-zero principal curvatures. Then $x$ is associated with a Laguerre metric $\mathbf{g}$, a Laguerre tensor $\mathbf{L}$, a Laguerre form $\mathbf{C}$, and a Laguerre second fundamental form $\mathbf{B}$, which are invariants of $x$ under Laguerre transformation group. We denote the Laguerre scalar curvature by $R$ and the trace-free Laguerre tensor by $\tilde{\mathbf{L}}:={\mathbf{L}}-\frac{1}{n-1}tr({\mathbf{L}})\mathbf{g}$. In this paper, we prove a local classification result under the assumption of parallel Laguerre form and an inequality of the type $$\|\tilde{\mathbf{L}}\|\leq cR,$$ where $c=\frac{1}{(n-3)\sqrt{(n-2)(n-1)}}$ is appropriate real constant, depending on the dimension.
Characterization of Rosa chinensis CBF Genes and the Function of RcCBF6 in Cold Tolerance
Jianbo Li 한국식물학회 2020 Journal of Plant Biology Vol.63 No.4
As a class of AP2 family transcription factors, C-repeat binding factor (CBF) gene family plays an important role in resisting low-temperature stress and improving cold tolerance of plants. Rosa chinensis is an important horticultural and ornamental plant, but little is known about the molecular characteristics of CBF genes in R. chinensis. In our study, six RcCBFs members were identified at R. chinensis whole genome, including one member RcCBF1 on Chromosome 1 and other five members RcCBF2-6 on Chromosome 7. The analysis of cis-acting elements indicated that there were various cis-acting elements related to stress, development, hormone, and light. The expression profiles showed that most of RcCBFs were mainly expressed in root, and the expression levels of RcCBFs were significantly induced by low-temperature stress, especially RcCBF6. To verify the function of RcCBF6, we generated its overexpressing transgenic lines in Arabidopsis thaliana. The RcCBF6-overexpressing plants exhibited higher tolerance to cold stress as evidenced by a better growth and higher antioxidative enzyme activities than the wild-type plants. Furthermore, the expression levels of some cold-response genes were up-regulated in the transgenic plants, such as KIN1, RD29A, LTP3, and GOLS3. Our study contributes to a better understanding of RcCBF gene family and provides a foundation for the further functional research of RcCBFs.
Polygonumnolides A1–B3, minor dianthrone derivatives from the roots of Polygonum multiflorum Thunb
Jianbo Yang,Zheng Yan,Jin Ren,Zhong Dai,Shuangcheng Ma,Aiguo Wang,Yalun Su 대한약학회 2018 Archives of Pharmacal Research Vol.41 No.6
Seven new dianthrone glycosides, named polygonumnolidesA1–B3 (1–7), were isolated from the 70 %EtOH extract of the dried roots of Polygonum multiflorumThunb. using column chromatography and preparativehigh-performance liquid chromatography. Their structureswere determined by 1D and 2D NMR and mass spectroscopy. The isolated compounds were evaluated for theircytotoxic effects against KB tumor cell lines and compounds1–4 showed moderate cytotoxicity.
Jianbo Gu,Xiang Wang,Chengze Xu,Xiangyang Feng,Siyuan Zhang 한국고분자학회 2023 Macromolecular Research Vol.31 No.6
In recent years, high refractive index polythiourethane materials have attracted increasing attention. In this study, the soft segment part of conventional polyurethane was replaced by ethylenedithiol, and a series of nanocomposite films containing Mercaptoethanol (ME) capped ZnS NPs were prepared by UV curing after the synthesis of the bifunctional linear prepolymer with hydroxyethyl acrylate as capping agent and trifunctional prepolymer with trimethylolpropane triacrylate as sulfhydrylate capping. ZnS NPs were well dispersed in the resin system, and the transmittance of the film decreased with the increase of ZnS content, but it did not float much and still has 80% transmittance at 40%. The addition of ZnS had a significant improvement on the refractive index. The RI of the system without the addition of particles was less than 1.5, the system with 40% was greater than 1.6. It was worth noting that the Abbe number was almost greater than 30, which was in the category of low dispersion.
Microstructure and Tensile Properties of a Cast Eutectic Al–Si–Cu Alloy Modified by Zr and V
Jianbo Sun,Guangkai Zeng,Dewang Rao,Yuchen Wang,Yiwang Yang,Liwen Pan,Zhiliu Hu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Minor Zr and V were added individually and jointly to Al–12.5Si–1Cu alloy to develop heat-resistant aluminum alloys. Theas-cast microstructure, room temperature, and high temperature (350 °C) tensile properties and the strengthening mechanismof the modified alloys were investigated. The results show that the rod-like (Al, Si)3Zr and hexagonal (Si, Al)2V precipitatesare respectively found in the alloys with individually added Zr or V. At the same time, they were transformed into (Al,Si)3(Zr, V) and (Si, Al)2(V, Zr) when Zr and V were added together. Individually added Zr or V could change the eutecticsilicon aspect ratio, but the largest effect was recorded for the combined addition 0.3 wt% Zr + 0.4 wt% V. The addition ofZr and V had no significant impact on the room temperature tensile strength of the alloys but improved the yield strength. Individual additions of Zr and V caused negligible improvements in high-temperature tensile strength of alloys tested. Incontrast, the combined Zr + V additions resulted in the substantial improvement with tensile strength at 350 °C reaching79.4 MPa, i.e. 89% higher than the base alloy. The analysis shows that the increase of eutectic silicon aspect ratio and thesolution strengthening of trace V in eutectic silicon is the leading cause of improving high-temperature tensile strength. Thebrittle, blocky primary silicon, coarse rod-like (Al, Si)3(Zr, V), and hexagonal (Si, Al)2(V, Zr) precipitates are detrimentalto high-temperature properties.
Jianbo Ji,Wen Chen,Shanlin Sun 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
In this paper, we investigate the capacity of a multipointto-point cognitive radio network. In existing works, the asymptoticcapacity is only obtained in the high peak power region at secondarytransmitter (ST) or obtained without considering the interferencefrom primary transmitter (PT) for easy analysis. Here, weanalyze the asymptotic capacity by considering an arbitrary peakpower at the ST and the interference from the PT based on extremevalue theory. Simulation results show that our approximatedcapacity is well-matched to the exact capacity. Furthermore, thescaling law of our capacity is found to be double logarithm of thenumber of secondary users.